Field
[0001] Embodiments herein relate to ear-wearable devices and more particularly to ear-wearable
devices having moving coil receivers.
Background
[0002] Ear-wearable devices are electronic instruments worn in or around the ear that compensate
for hearing losses by amplifying sound. Many ear-wearable devices include a receiver
configured to convert electrical signals into sounds. Some ear-wearable devices include
a balanced armature receiver and have a closed fit in which the user's ear canal is
sealed to the device. Open fit hearing aids can improve user experience by enhancing
comfort and allowing ambient sound to enter and own-voice sounds to exit the ear canal,
providing a more natural listening experience. Many ear-wearable devices have less
than ideal bass response and can be improved to provide a higher-quality sound for
the user.
Summary
[0003] In a first aspect, an ear-wearable device can include a receiver assembly, wherein
the receiver assembly includes: a receiver housing having a front housing portion
can include a front housing wall, a rear housing portion can include a rear housing
wall, wherein the rear housing wall defines a rear acoustic inlet. The ear-wearable
device can include a receiver configured to convert electrical signals into sounds.
The ear-wearable device can include an insert configured to fit within the receiver
housing and defining a first insert opening, the insert can include a first insert
side facing the front housing portion and a second insert side facing the rear housing
wall. The ear-wearable device can include a rear acoustic passage defined between
the rear housing wall and the second insert side, the rear acoustic passage extending
between the rear acoustic inlet and a receiver inlet disposed adjacent to the first
insert opening. In various embodiments, the receiver can be configured to fit within
the receiver housing between the front housing portion and the first insert side.
In various embodiments, a front housing volume can be formed between a receiver front
side and the front housing wall. In various embodiments, the receiver housing can
be configured to permit fluid communication between an external environment and the
receiver rear side through the rear acoustic inlet and the rear acoustic passage.
[0004] In a second aspect, in addition to one or more of the preceding or following aspects,
or in the alternative to some aspects, the front housing portion further can include
a stem protruding from the front housing wall, the stem defining a stem acoustic channel.
[0005] In a third aspect, in addition to one or more of the preceding or following aspects,
or in the alternative to some aspects, further can include an earbud configured to
removably attach to the stem of the receiver housing, the earbud can include: an axial
wall defining an earbud acoustic channel, wherein the earbud acoustic channel can
be in acoustic communication with the stem acoustic channel, and an outer dome connected
to the axial wall at a front edge and unconnected to the axial wall at a rear edge.
[0006] In a fourth aspect, in addition to one or more of the preceding or following aspects,
or in the alternative to some aspects, the earbud further can include a plurality
of vent openings defined in the axial wall.
[0007] In a fifth aspect, in addition to one or more of the preceding or following aspects,
or in the alternative to some aspects, the axial wall can include: a first portion
can include a first material, the first portion defining retention features configured
to removably attach to the stem of the receiver housing, and a second portion can
include a second material configured to conform to an ear of a wearer, wherein the
second material can be more complaint than the first material.
[0008] In a sixth aspect, in addition to one or more of the preceding or following aspects,
or in the alternative to some aspects, the rear housing portion further can include
an ambient opening defined in the rear housing wall, wherein the ambient opening can
be configured to be in fluid communication with a rear side of the receiver.
[0009] In a seventh aspect, in addition to one or more of the preceding or following aspects,
or in the alternative to some aspects, the insert further defines a second insert
opening in acoustic communication with the ambient opening.
[0010] In an eighth aspect, in addition to one or more of the preceding or following aspects,
or in the alternative to some aspects, the ear-wearable device can further include
a first mesh layer having a first set of acoustic properties, wherein the first mesh
layer can be configured to cover the ambient opening, and a second mesh layer having
a second set of acoustic properties, wherein the second mesh layer can be configured
to cover the ambient opening and the rear acoustic inlet. The first mesh layer can
be configured to provide more acoustic damping than the second mesh layer.
[0011] In a ninth aspect, in addition to one or more of the preceding or following aspects,
or in the alternative to some aspects, the rear acoustic passage includes a curved
portion between the rear acoustic inlet and the receiver inlet.
[0012] In a tenth aspect, in addition to one or more of the preceding or following aspects,
or in the alternative to some aspects, the curved portion of the rear acoustic passage
includes an arc-shaped trajectory in a plane parallel to at least a portion of the
rear housing wall.
[0013] In an eleventh aspect, in addition to one or more of the preceding or following aspects,
or in the alternative to some aspects, the rear acoustic passage can include: a first
axial portion extending away from the rear acoustic inlet to a first plane, a second
axial portion extending from the first plane to the receiver inlet, and a curved portion
spanning between the first vertical portion and the second vertical portion, wherein
the curved portion makes an arc-shaped trajectory intersecting the first plane.
[0014] In a twelfth aspect, in addition to one or more of the preceding or following aspects,
or in the alternative to some aspects, the rear acoustic passage can be tuned to increase
a low frequency efficiency of the receiver.
[0015] In a thirteenth aspect, in addition to one or more of the preceding or following
aspects, or in the alternative to some aspects, the receiver includes a moving coil
receiver.
[0016] In a fourteenth aspect, an ear-wearable device can include a receiver assembly, the
receiver assembly can be included having a receiver configured convert electrical
signals into sounds, the receiver can include a front side and a receiver rear side.
The receiver assembly can include a receiver housing can be included having a front
housing portion can include a front housing wall, a rear housing portion can include
a rear housing wall, wherein the rear housing wall defines a rear acoustic inlet.
The receiver assembly can include a rear acoustic passage defined adjacent to the
rear housing wall, the rear acoustic passage extending between the rear acoustic inlet
and a receiver inlet. In various embodiments, the receiver can be configured to fit
within the receiver housing between the front housing portion and the rear housing
portion. In various embodiments, a front housing volume can be formed between the
receiver front side and the front housing wall. In various embodiments, the receiver
housing can be configured to permit fluid communication between an external environment
and the receiver rear side through the rear acoustic inlet and the rear acoustic passage.
In various embodiments, the rear acoustic passage includes a curved portion between
the rear acoustic inlet and the receiver inlet.
[0017] In a fifteenth aspect, in addition to one or more of the preceding or following aspects,
or in the alternative to some aspects, the rear housing portion further can include
an ambient opening defined in the rear housing wall, wherein the ambient opening can
be configured to be in fluid communication with a rear side of the receiver.
[0018] In a sixteenth aspect, in addition to one or more of the preceding or following aspects,
or in the alternative to some aspects, the ear-wearable device can further include
a. a first mesh layer having a first set of acoustic properties, wherein the first
mesh layer can be configured to cover the ambient opening and a second mesh layer
having a second set of acoustic properties, wherein the second mesh layer can be configured
to cover the ambient opening and the rear acoustic inlet. The first mesh layer can
be configured to provide more acoustic damping than the second mesh layer.
[0019] In a seventeenth aspect, in addition to one or more of the preceding or following
aspects, or in the alternative to some aspects, the curved portion of the rear acoustic
passage includes an arc-shaped trajectory in a plane parallel to at least a portion
of the rear housing wall.
[0020] In an eighteenth aspect, in addition to one or more of the preceding or following
aspects, or in the alternative to some aspects, the rear acoustic passage can include:
a first axial portion extending away from the rear acoustic inlet to a first plane,
a second axial portion extending from the first plane to the receiver inlet, and the
curved portion spanning between the first vertical portion and the second vertical
portion, wherein the curved portion makes an arc-shaped trajectory intersecting the
first plane.
[0021] In a nineteenth aspect, in addition to one or more of the preceding or following
aspects, or in the alternative to some aspects, the rear acoustic passage can be tuned
to increase a low frequency efficiency of the receiver.
[0022] In a twentieth aspect, an ear-wearable device can include a receiver assembly, wherein
the receiver assembly includes a receiver housing, the receiver housing can include
a rear housing wall, wherein the rear housing wall defines a rear acoustic inlet.
The ear-wearable device can include a receiver configured to convert electrical signals
into sounds and configured to fit within the receiver housing. The ear-wearable device
can include a rear acoustic passage at least partially defined between a first housing
component and a second housing component. In various embodiments, the first housing
component and a second housing component can be separately manufactured and then can
be assembled to form at least a portion of the receiver assembly. In various embodiments,
the rear acoustic passage extends between the rear acoustic inlet and a rear cavity
adjacent to the receiver rear side. In various embodiments, the receiver housing can
be configured to permit fluid communication between an external environment and the
rear cavity through the rear acoustic inlet and the rear acoustic passage.
[0023] This summary is an overview of some of the teachings of the present application and
is not intended to be an exclusive or exhaustive treatment of the present subject
matter. Further details are found in the detailed description and appended claims.
Other aspects will be apparent to persons skilled in the art upon reading and understanding
the following detailed description and viewing the drawings that form a part thereof,
each of which is not to be taken in a limiting sense. The scope herein is defined
by the appended claims and their legal equivalents.
Brief Description of the Figures
[0024] Aspects may be more completely understood in connection with the following figures
(FIGS.), in which:
FIG. 1 is a schematic view of an ear-wearable device in accordance with various embodiments
herein.
FIG. 2 is a schematic block diagram shown with various components of a hearing assistance
device in accordance with various embodiments herein.
FIG. 3 is a cross-sectional view of receiver assembly in accordance with various embodiments
herein.
FIG. 4 is a bottom perspective view of a portion of the receiver assembly of FIG.
3 in accordance with various embodiments herein.
FIG. 5 is an exploded view of the bottom of receiver assembly in accordance with various
embodiments herein.
FIG. 6 is an exploded view of a receiver assembly in accordance with various embodiments
herein.
FIG. 7 is a cross sectional view of a receiver assembly through a rear acoustic inlet
of a rear acoustic passage in accordance with various embodiments herein.
FIG. 8 is a cross sectional view of a receiver assembly through a receiver inlet of
the rear acoustic passage in accordance with various embodiments herein.
FIG. 9 is a cross sectional view of a receiver assembly through the rear acoustic
passage plane in accordance with various embodiments herein.
FIG. 10 is a partially exploded view of a receiver assembly showing the second insert
side in accordance with various embodiments herein.
FIG. 11 is a cross-sectional view of an earbud in accordance with various embodiments
herein.
[0025] While embodiments are susceptible to various modifications and alternative forms,
specifics thereof have been shown by way of example and drawings and will be described
in detail. It should be understood, however, that the scope herein is not limited
to the particular aspects described. On the contrary, the intention is to cover modifications,
equivalents, and alternatives falling within the spirit and scope herein.
Detailed Description
[0026] Ear-wearable devices include a receiver configured to convert electrical signals
into sounds. Certain types of receivers (e.g., balanced armature receivers) perform
optimally when the ear-wearable device has a closed fit, meaning that the wearer's
ear canal is sealed by the ear-wearable device. Such receivers suffer from poor low-frequency
response when configured with an open fit, resulting in negative consequences such
as poor sound quality, including tinny sounds and low frequency distortion. By utilizing
a moving coil receiver, an ear-wearable device can be designed to have an open fit
while providing an acceptable low frequency response.
[0027] Many long-term hearing aid users find an open-fit hearing aid to be more comfortable
in the ear than a closed-fit hearing aid. When an ear-wearable device seals the ear
canal, it can create a feeling of fullness or discomfort due to the pressure differential.
An open fit helps alleviate this pressure by allowing air to flow in and out of the
ear canal, making the ear-wearable device more comfortable to wear.
[0028] Open fit ear-wearable devices can be especially helpful to individuals with high-frequency
hearing loss. Examples of high-frequency sounds are speech consonants and birdsong.
Instead of completely sealing the ear canal, like in closed-fit ear-wearable devices,
open-fit ear-wearable devices leave the ear canal partially open. This allows natural
sound to enter the ear, including lower frequency sounds that the user can hear, while
amplifying specific frequencies that the user has difficulty hearing.
[0029] An open-fit device can also avoid the occlusion effect, a phenomenon where the sound
of the user's own voice sounds strange, hollow, or booming when wearing a closed-fit
device. When the ear is plugged, low-frequency sound from the user's voice is trapped
in the ear, does not exit the ear, and creates acoustic pressure in the ear while
the user is speaking. For all these reasons, an open-fit ear-wearable device is selected
by many users. However, it is challenging for open-fit ear-wearable devices to accurately
produce lower frequency sounds. Unfortunately, some open-fit ear-wearable devices
sound "tinny" instead of rich and full when producing lower frequency sounds. This
issue can be mitigated by strategically designing an acoustic volume behind the receiver
or speaker of the ear-wearable device.
[0030] In various embodiments, an ear-wearable device can include a rear acoustic passage
with characteristics that support the production of high-quality sound by the ear-wearable
device. Such a rear acoustic passage can be provided in an open-fit or closed-fit
ear-wearable device.
[0031] In various embodiments, an ear wearable device includes receiver assembly with a
receiver housing having a front housing portion and a rear housing portion, and the
wall of the rear housing portion can define a rear acoustic inlet leading to a rear
acoustic passage that provides an acoustic mass or acoustic inertance behind a receiver.
The rear acoustic passage permits fluid communication between an external environment
and a receiver rear side. In some embodiments, the rear acoustic passage includes
a curved portion. In some embodiments, the rear acoustic passage comprises an arc-shaped
trajectory in a plane parallel to at least a portion of the rear housing wall.
[0032] In some embodiments, a rear acoustic passage can be defined between two separately
manufactured components that are used in a receiver assembly. Because the rear acoustic
passage can have a diameter that is quite small, such as in the range of about 0.5
to 2 mm, it is challenging to manufacture a component that defines a precisely shaped
passage. In various embodiments, two separately manufactured components can be brought
together in the receiver assembly such that the rear acoustic passage is defined between
a first housing component and a second housing component.
[0033] In some embodiments, the receiver assembly can include an insert that cooperates
with the rear housing to define the rear acoustic passage between one side of the
insert and a rear housing wall of the receiver housing. Embodiments that define the
rear acoustic passage between two components, such as between an insert and a rear
housing, can enjoy an easier and more efficient manufacturing process and provide
more flexibility in tuning the shape of the acoustic passage.
[0034] For embodiments with an open-fit, an earbud can be provided having an axial wall
defining an earbud acoustic channel and an outer dome connected to the axial wall
at a front edge and unconnected to the axial wall at a rear edge. Vent openings defined
in the axial wall can provide fluid communication between the user's ear canal and
the ambient environment, allowing pressure to equalize and often allowing natural
sounds to be heard by the user.
Ear-Worn Devices (FIGS. 1-2)
[0035] Referring now to FIG. 1, a schematic view of an ear-wearable device is shown in accordance
with various embodiments herein. The ear-wearable device 100 can include a receiver
assembly 102 adjacent to an earbud 104 configured to fit within the ear canal of the
ear-wearable device user. The receiver assembly 102 can include a receiver housing
109 and a receiver (not shown in this view) configured to fit within the receiver
housing 109 that converts electrical signals into sound, such as an electroacoustic
transducer, speaker, or the like. The ear-wearable device 100 can further include
an ear-wearable device housing 106. A cable 108 or connecting wire can include one
or more electrical conductors and provide electrical communication between components
inside of the ear-wearable device housing 106 and components inside of the receiver
assembly 102. The ear-wearable device housing 106 can define a battery compartment
into which a battery can be disposed to provide power to the ear-wearable device 100.
The ear-wearable device housing 106 can include one or more microphones 107 configured
to receive an acoustic input from the surrounding environment and to transmit the
acoustic input to the receiver via the cable 108.
[0036] In various embodiments, the ear-wearable device 100 can be an open fit ear-wearable
device. Alternatively, a version of the ear-wearable device 100 that has a closed
fit is also possible, as features described herein could be beneficial in the closed-fit
device environment.
[0037] In the example of FIG. 1, the receiver of an open-fit ear-wearable device is configured
to be positioned in the ear canal, near the eardrum, delivering sound directly into
the ear canal.
[0038] The ear-wearable device 100 shown in FIG. 1 is a receiver assembly-in-canal type
device and thus the receiver assembly 102 is designed to be placed within the ear
canal. However, it will be appreciated that many different form factors for hearing
assistance devices are contemplated herein. As such, hearing assistance devices herein
can include, but are not limited to, behind-the-ear (BTE), in-the ear (ITE), in-the-canal
(ITC), invisible-in-canal (IIC), receiver assembly-in-canal (RIC), receiver assembly
in-the-ear (RITE) and completely-in-the-canal (CIC) type hearing assistance devices.
Aspects of hearing assistance devices and functions thereof are described in
U.S. Pat. No. 9,848,273;
U.S. Publ. Pat. Appl. No. 20180317837; and
U.S. Publ. Pat. Appl. No. 20180343527, the content of all of which is herein incorporated by reference in their entirety.
[0039] Referring now to FIG. 2, a schematic block diagram is shown with various components
of a hearing assistance device in accordance with various embodiments. The block diagram
of FIG. 2 represents a hearing assistance device for purposes of illustration. The
ear-wearable device 100 shown in FIG. 2 includes several components electrically connected
to a printed circuit board 218 (e.g., flexible printed circuit board) (e.g., flexible
mother board) which is disposed within ear-wearable device housing 106. A power supply
circuit 204 can include a battery and can be electrically connected to the printed
circuit board 218 and provides power to the various components of the ear-wearable
device 100. One or more microphones 206 are electrically connected to the printed
circuit board 218, which provides electrical communication between the microphones
206 and a digital signal processor (DSP) 212. Among other components, the DSP 212
incorporates or is coupled to audio signal processing circuitry configured to implement
various functions described herein. A sensor package 214 can be coupled to the DSP
212 via the printed circuit board 218. The sensor package 214 can include one or more
different specific types of sensors such as those described in greater detail below.
One or more user switches 210 (e.g., on/off, volume, mic directional settings, memory
change) are electrically coupled to the DSP 212 via the printed circuit board 218.
[0040] An audio output device 216 is operatively connected to the DSP 212 via the printed
circuit board 218. In some embodiments, the audio output device 216 comprises a speaker
(coupled to an amplifier). In other embodiments, the audio output device 216 comprises
an amplifier coupled to a receiver 226 adapted for positioning within an ear of a
wearer. The receiver 226 can include a transducer (e.g., a speaker).
[0041] An electrical filter component 230 may also be included, either within the ear-wearable
device housing 106, in a receiver assembly 102, or in a different housing. An electrical
filter 230 can help to reduce power consumption of the receiver 226. One example of
a filter is an electrical inductor, which includes a coil in some embodiments. In
some examples, the electrical inductor may have a value of between about 1-20 microhenry.
The electrical filter component can be electrically connected to a signal output of
the audio output device and to the positive input of the receiver. Alternatively,
the electrical filter component can be electrically connected to a negative terminal
of the audio output device and to the negative terminal of the receiver. In some embodiments,
the electrical filter component is electrically connected to both a positive and negative
terminal of the receiver and the audio output device.
[0042] The ear-wearable device 100 may incorporate a communication device 208 coupled to
the printed circuit board 218 and to an antenna 202 directly or indirectly via the
printed circuit board 218. The communication device 208 can be a Bluetooth
® transceiver, such as conforms to a Bluetooth
® specification, for example, including but not limited to Bluetooth
® low energy (BLE), Bluetooth
® 4.2 or 5.0, and Bluetooth
® Long Range). Hearing assistance devices of the present disclosure can incorporate
an antenna arrangement coupled to a high-frequency radio, such as a 2.4 GHz radio.
The radio can conform to an IEEE 802.11 compliant device (e.g., WIFI
®). It is understood that hearing assistance devices of the present disclosure can
employ other radios, such as a 900 MHz radio.
[0043] Hearing assistance devices of the present disclosure can be configured to receive
streaming audio (e.g., digital audio data or files) from an electronic or digital
source. Hearing assistance devices herein can also be configured to switch communication
schemes to a long-range mode of operation, wherein, for example, one or more signal
power outputs may be increased, and data packet transmissions may be slowed or repeated
to allow communication to occur over longer distances than that during typical modes
of operation. Representative electronic/digital sources (also serving as examples
of accessory devices herein) include an assistive listening system, a TV streamer,
a radio, a smartphone, a cell phone/entertainment device (CPED), a pendant, wrist-worn
device, or other electronic device that serves as a source of digital audio data or
files.
[0044] The communication device 208 can be configured to communicate with one or more external
devices, such as those discussed previously, in accordance with various embodiments.
In various embodiments, the communication device 208 can be configured to communicate
with an external visual display device such as a smart phone, a video display screen,
a tablet, a computer, or the like.
[0045] In various embodiments, the ear-wearable device 100 can also include a control circuit
222 and a memory storage device 224. The control circuit 222 can be in electrical
communication with other components of the device. The control circuit 222 can execute
various operations, such as those described herein. The control circuit 222 can include
various components including, but not limited to, a microprocessor, a microcontroller,
an FPGA (field-programmable gate array) processing device, an ASIC (application specific
integrated circuit), or the like. The memory storage device 224 can include both volatile
and non-volatile memory. The memory storage device 224 can include ROM, RAM, flash
memory, EEPROM, SSD devices, NAND chips, and the like. The memory storage device 224
can be used to store data from sensors as described herein and/or processed data generated
using data from sensors as described herein, including, but not limited to, information
regarding exercise regimens, performance of the same, visual feedback regarding exercises,
and the like.
Receiver Assembly (FIG. 3)
[0046] Referring now to FIG. 3, a cross-sectional view of receiver assembly is shown in
accordance with various embodiments herein. In various embodiments, the ear-wearable
device can include a receiver assembly 102 connected to an earbud 104. In various
embodiments, the receiver assembly 102 can include a receiver housing 109 having a
front housing portion 310 and a rear housing portion 312. The front housing portion
310 and rear housing portion 312 can each be formed from any suitable material or
materials including, but not limited to silicone, urethane, acrylates, flexible epoxy,
acrylate urethane, and combinations thereof. In some embodiments, the front housing
portion 310 and the rear housing portion 312 are formed from the same material. Alternatively,
the front housing portion 310 and rear housing portion 312 may be formed from different
materials from each other. In some embodiments, the front housing portion 310 is manufactured
to be removably attachable to the rear housing portion 312 by any combination of means
including, but not limited to adhesives, snap fits, press fits, pin connections, or
the like. Alternatively, the front housing portion 310 can be permanently attached
to the rear housing portion 312 by any means including, but not limited to welding,
ultrasonic welding, heat welding, soldering, adhesives, press-fit connections, snap-fit
connections, heat staking, threading the components together, or the like. In various
embodiments, the front housing portion 310 can include a front housing wall 311 and
can define a front housing volume 314. In various embodiments, the rear housing portion
312 can include a rear housing wall 313 and can define a rear housing volume and/or
a rear acoustic passage 316.
[0047] In various embodiments, the receiver assembly 102 may further include a receiver
318 configured to fit within the receiver housing 109. A receiver, as defined herein,
is any device that is configured to convert electrical signals into sounds. In the
context of ear-wearable devices, one or more microphones (such as microphone 107 included
in the in the ear-wearable device housing 106 of FIG. 1) gather acoustic energy (sound)
from the surrounding environment and convert the acoustic energy into electrical signals.
In some embodiments, the electrical signals are then transmitted to an amplifier which
performs various signal processing steps such as increasing the amplitude of the electric
signals. In some cases, the amplifier may perform further processing on the electrical
signals such as filtering, compression, or the like. The amplified electric signals
are then transmitted to the receiver 318, which converts the received electric signals
into sounds (e.g., pressure waves configured to propagate through the acoustic environment).
The sounds are then transmitted to a user's ear via an acoustic outlet 321 defined
in the earbud 104. Any suitable type or types of receivers can be used in the ear-worn
device including, but not limited to armature receivers, moving coil receivers, micro-electromechanical
system (MEMS) speakers, or the like.
[0048] In the example of FIG. 3, the receiver 318 is a moving coil receiver. A moving coil
receiver, also known as a dynamic receiver, as defined herein is a type of electroacoustic
transducer used in various audio devices, including ear-wearable devices. Moving coil
receivers typically contain a thin, lightweight coil of wire that is suspended within
a magnetic field and attached to a diaphragm. The coil can be positioned within a
permanent magnet, or an electromagnetic field created by a magnet. Electrical signals
received from the ear-wearable device's amplifier are passed through the coil. These
electrical signals create a varying electromagnetic field around the coil. As the
electrical signals flow through the coil, the interaction between the electromagnetic
field and the coil causes the coil and the attached diaphragm to vibrate. The vibration
of the diaphragm produces sound waves that correspond to the electrical signals. The
sound waves are emitted from the receiver. For instance, sounds can be emitted from
the ear-wearable device 100 at acoustic outlet 321 and directed into the user's ear
canal.
[0049] In various embodiments, a moving coil receiver includes a diaphragm with a diameter
of at least 2, 4, 8, 9, 10, 11, 12, 13 or 14 millimeters (mm), or ranges between these
values. In one example, the moving coil receiver has a diaphragm having a diameter
of 13 mm.
[0050] In various embodiments, the receiver assembly 102 can include an insert 322 configured
to fit within the receiver housing 109. The insert 322 can be placed within the receiver
housing 109, such as to separate the front housing volume 314 from the rear acoustic
passage 316. The insert 322 can have a first insert side 323 facing the front housing
portion 310 and a second insert side 325 facing the rear housing wall 313. In the
example of FIG. 3, the receiver 318 is configured to fit within the receiver housing
109 between the front housing portion 310 and the first insert side 323. In some embodiments,
a portion of receiver 318 is supported by the insert 322. In some embodiments, a portion
of receiver 318 is supported by one or more ledges 327 defined within the rear housing
wall 313.
[0051] In various embodiments, the receiver assembly 102 may further include one or more
filters 230. Filter 230 can be configured to modify and enhance the incoming acoustic
input by selectively amplifying or attenuating specific frequencies or sound characteristics.
In the example of FIG. 3, the filter 230 is configured to fit within the receiver
housing 109 within a space defined by the insert 322.
Acoustic Openings (FIG. 4)
[0052] Referring now to FIG. 4, a bottom perspective view of a portion of the receiver assembly
of FIG. 3 is shown in accordance with various embodiments herein. The receiver assembly
102 can include a receiver housing 109 having a front housing portion 310 and a rear
housing portion 312. In various embodiments, the receiver assembly can include one
or more acoustic openings. In the example of FIG. 4, the receiver assembly can include
a rear acoustic inlet 422 defined in the rear housing wall 313 of the rear housing
portion 312. The rear acoustic inlet 422 is in acoustic communication with the rear
acoustic passage 316, which is in acoustic communication with the receiver 318.
[0053] The rear housing wall 313 can further define one or more ambient openings 424. In
some embodiments, the receiver assembly 102 can include greater than or equal to one,
two, three, or four ambient openings of any suitable size, shape, and configuration.
In various embodiments, the ambient openings 424 are in acoustic communication with
the receiver 318. FIG. 4 shows the bottom view without any mesh layers against the
rear housing wall 313, so that the rear acoustic inlet 422 and ambient openings 424
are visible.
Mesh Layer Configuration (FIG. 5)
[0054] Referring now to FIG. 5, an exploded view of the receiver assembly of FIG. 4 is shown
in accordance with various embodiments herein. In various embodiments, the receiver
assembly 102 can include a first mesh layer 528 and a second mesh layer 530. The first
mesh layer 528 and the second mesh layer 530 can be formed from any suitable type
of mesh (or other material having similar acoustic properties) such as acoustic mesh.
Acoustic mesh as defined herein is a particular type of wire mesh used to achieve
sound attenuation objectives.
[0055] The first mesh layer 528 can have a first set of acoustic properties and the second
mesh layer can have a second set of acoustic properties. In some embodiments, the
first mesh layer 528 and second mesh layer can have the same acoustic properties.
Alternatively, the first mesh layer 528 and second mesh layer 530 and the second mesh
layer can have different acoustic properties. For instance, the first mesh layer 528
can be formed from a denser weave than the second mesh layer 530 such that the first
mesh layer is configured to provide greater sound attenuation and/or acoustic damping
than the second mesh layer. Alternatively, the first mesh layer 528 can be formed
from a less dense weave than the second mesh layer 530
[0056] In various embodiments, the first mesh layer 528 is configured to cover the ambient
openings 424 on the rear housing wall 313. In various embodiments, the first mesh
layer 528 can be held by place by one or more features (e.g., protrusions and indentations)
on the rear housing wall 313. For instance, the first mesh layer 528 includes a mesh
aperture 529 configured to interface with a protrusion 531 defined by the rear housing
wall 313 and the first mesh layer 528 can sit within a first indentation 532 of the
rear housing wall 313. In the example of FIG. 5, the first mesh layer does not cover
the rear acoustic inlet 422. However, in alternative embodiments, the first mesh layer
can cover the rear acoustic inlet 422.
[0057] In various embodiments, the second mesh layer 530 is configured to cover the ambient
openings 424 and the rear acoustic inlet 422 on the rear housing wall 313. In the
example of FIG. 5, the second mesh layer 530 is stacked on top of the first mesh layer
528, but in alterative embodiments, the first mesh layer 528 may be stacked on top
of the second mesh layer 530. In various embodiments, the second mesh layer 530 can
be held by place by one or more features (e.g., protrusions and indentations) defined
on the rear housing wall 313. For instance, the second mesh layer 530 can sit within
a second indentation 534 of the rear housing wall 313.
[0058] In various embodiments, the first mesh layer 528 and the second mesh layer 530 are
distributed over the various openings of the rear housing wall 313 to optimize their
acoustic damping effects. In some embodiments, such as the device shown in the FIGS.,
it can be advantageous to have more damping on the ambient openings 424 than on the
rear acoustic inlet 422, because the ambient openings lead to shorter axially-oriented
rear vent passages while the rear acoustic inlet leads to a curved rear acoustic passage,
oriented to span a larger portion of the receiver rear wall area and with more acoustic
resistance than the vent passages. The mesh densities can be selected to provide the
best acoustic properties for a particular ear-worn device configuration. The mesh
layers 528, 530 can also provide ingress protection to the rear acoustic volume.
[0059] The example of FIG. 3 shows a receiver assembly having two mesh layers. Alternatively,
the receiver assembly 102 may have any suitable number of mesh layers such as one,
two, three, four, or more mesh layer distributed in any suitable configuration over
the rear acoustic inlet 422 and the ambient openings 424.
Receiver Assembly Exploded View (FIG. 6)
[0060] Referring now to FIG. 6, an exploded view of a receiver assembly is shown in accordance
with various embodiments herein. In various embodiments, the receiver assembly 102
can include an earbud 104, a first mesh layer 528, a second mesh layer 530, and a
receiver housing formed from a front housing portion 310 and a rear housing portion
312. The receiver housing can include at least a receiver 318, a filter component
230, and an insert 322.
[0061] In various embodiments, the earbud 104 can be removably attachable to the front housing
portion 310 of the receiver assembly 102. The earbud 104 can include one or more layers
of mesh. In the example of FIG. 6, the receiver assembly can include a first earbud
mesh layer 632 and a second earbud mesh layer 633. The first earbud mesh layer 632
and the second earbud mesh layer 633 are configured to prevent foreign matter from
entering the receiver housing 109 through the earbud 104 and can be designed with
any suitable acoustic properties to optimize sound quality. The first earbud mesh
layer 632 and the second earbud mesh layer 633 can be separated from each other within
the receiver assembly 102 by a fixed axial distance. In various embodiments, the first
earbud mesh layer 632 can be disposed within the earbud 104 and the second earbud
mesh layer 633 can be disposed on the top of the stem 842 (best seen in FIG. 8) of
the receiver housing 109. Alternatively, the receiver assembly 102 may include only
one of mesh layers 632, 633 or may not include any mesh layers in the earbud 104 or
stem 842.
[0062] In various embodiments, the receiver assembly 102 can include an insert 322 configured
to fit within the receiver housing 109. The insert 322 can be placed within the receiver
housing 109, such as to separate the front housing volume 314 from the rear acoustic
passage 316. The insert 322 can partially define the rear acoustic passage 316. In
various embodiments, the insert 322 can have one or more openings spanning from the
first insert side 323 to the second insert side 325. In the example of FIG. 6, the
insert can have a first insert opening 638 configured to form a portion of the rear
acoustic passage 316. The insert can further include a second insert opening 639 configured
to hold the filter 230 within the receiver housing 109. In some examples, the second
insert opening 639 is configured to be slightly larger than the filter 230, in at
least one dimension. For instance, the second insert opening 639 can have a protruding
portion on either side. In some embodiments, the second insert opening 639 is in acoustic
communication with the ambient openings 424 defined in the rear housing wall 313.
As best seen in the cross-sectional view of FIG. 8, the second inset opening leaves
a gap in the receiver housing such that the ambient openings 424 are in fluid communication
with the receiver 318.
Acoustic Passages (FIGS. 7-8)
[0063] FIG. 7 is a cross sectional view of a receiver assembly through the rear acoustic
inlet 422, shown in accordance with various embodiments herein. FIG. 8 is a cross
sectional view of a receiver assembly through a receiver inlet 840, shown in accordance
with various embodiments herein. The receiver assembly 102 can include a rear acoustic
passage 316 defined between the rear housing wall 313 and the second insert side 325.
In addition, or alternatively, the receiver assembly can define venting passages leading
to the rear side of the receiver. The receiver assembly can also device a front acoustic
passage leading to an earbud.
[0064] In various embodiments, the rear acoustic passage 316 begins at the rear acoustic
inlet 422 (best seen in FIG. 7). The rear acoustic passage 316 extends through the
space defined between the rear housing wall 313 and the second insert side 325. The
rear acoustic passage 316 extends up though the first insert opening 638 and terminates
at the receiver inlet 840 (best seen in FIG. 8). In various embodiments, the receiver
housing 109 is configured to permit fluid communication between an external environment
and the receiver rear side 636 through the rear acoustic inlet 422 and the rear acoustic
passage 316. This fluid communication facilitates the easier movement of the receiver,
compared to if the housing was closed to fluid communication. The air in the rear
acoustic passage 316 provides a suspension effect to the receiver, allowing smoother
movement and facilitating high-quality sound production particularly at lower frequencies.
[0065] In various embodiments, the rear acoustic passage 316 can have an annular cross section
and can be partial defined by the rear housing wall 313 and partially defined by the
second insert side 325. In the example of FIGS. 7-8, approximately half of the cross-sectional
area of the rear acoustic passage 316 is defined by the rear housing wall 313, approximately
half of the cross-sectional area of the rear acoustic passage 316 is defined by the
second insert side 325, and the two halves are combined to form a rear acoustic passage
having a substantially circular cross section. In most conventional manufacturing
processes (e.g., injection molding, 3D printing), such a configuration is simpler
than forming an acoustic passage in a singular piece of material. However, in alternate
configurations, the rear acoustic passage 316 may be defined entirely by the rear
housing wall 313 or the rear acoustic passage 316 may be defined entirely by second
insert side 325. While the rear acoustic passage 316 is depicted as having a substantially
circular cross-sectional area in FIGS. 7-8, it is possible for the rear acoustic passage
to have any other suitable cross-sectional shape such as oval, square, or the like.
The rear housing and insert may be formed using injection molding, 3D printing, compression
molding, or other manufacturing processes.
[0066] The acoustic output from the receiver 318 is propagated through the front housing
volume 314. In various embodiments, the front housing volume 314 is formed between
a receiver front side 634 and the front housing wall 311. In various embodiments,
the front housing portion 310 includes a stem 842 protruding from the front housing
wall 311. In various embodiments, the stem 842 can define a front acoustic passage
844. The front acoustic passage 844 is in fluid communication with the front housing
volume 314. The acoustic output passes through the front housing volume 314 and front
acoustic passage 844 into the ear canal of the ear-wearable device user through the
acoustic outlet 321 defined in the earbud 104.
[0067] The rear housing wall 313 can further define one or more ambient openings 424. As
best seen in FIG. 8, the ambient openings 424 are in acoustic communication with the
receiver rear side 636 via rear vent passages 850. In various embodiments, the ambient
openings 424 are configured to provide venting to the receiver rear side 636 of the
receiver 318. Venting can improve the sound quality of the amplified sounds, by allowing
the receiver rear side 636 to move as it generates sound. The benefits of the venting
provided by the ambient openings 424 and the rear vent passages 850 can be optimized
using one or more mesh layers with acoustic properties, as discussed in the context
of FIG. 5.
Rear Acoustic Passage Shape (FIGS. 9-10)
[0068] FIG. 9 is a cross sectional view of a receiver assembly through the rear acoustic
passage plane shown in accordance with various embodiments herein, looking towards
the rear housing wall of the receiver housing. FIG. 10 is a partially exploded view
of a receiver assembly, where the rear housing portion 312 is removed from the receiver
assembly to reveal the second insert side 325, in accordance with various embodiments
herein.
[0069] In various embodiments, the rear acoustic passage 316 can include a curved portion
944 between the rear acoustic inlet 422 and the receiver inlet 840. The curved portion
944 can be defined in both the rear housing wall 313 (best seen in FIG. 9) and in
the second insert side 325 (best seen in FIG. 10). However, in alternate configurations,
the curved portion may be defined only by the rear housing wall 313 or only by an
insert component. In the example of FIGS. 9-10, the curved portion 944 of the rear
acoustic passage 316 has an arc shape in a plane parallel to at least a portion of
the rear housing wall. However, other suitable shapes of acoustic passage can be used
such as spiral, circular, oval, ellipse, square, rectangular, triangular, pie-piece
shaped, or chevron shaped. In some embodiments, the acoustic passage includes curved
surfaces and does not include hard corners or right angles, to reduce the chance of
echoes.
[0070] FIG. 9 includes dashed line 3-3 showing the cross-sectional plane of FIG. 3 through
the ambient openings 424. FIG. 9 also includes dashed line 7-7 showing the cross-sectional
plane of FIG. 7 through the rear acoustic inlet 422. FIG. 9 also includes dashed line
8-8 showing the cross-sectional plane of FIG. 8 through the receiver inlet 840.
[0071] Referring back to FIG. 7, the rear acoustic passage 316 can include a first axial
portion 739 extending away from the rear acoustic inlet 422 to the rear acoustic passage
plane 741. Referring back to FIG. 8, the rear acoustic passage 316 can include a second
axial portion 841 extending from the rear acoustic passage plane 741 through the first
insert opening 638 to the receiver inlet 840. Referring back to FIGS. 9-10, the curved
portion 944 of the rear acoustic passage 316 can be defined between the first axial
portion 739 and the second axial portion 841 and is configured to intersect the rear
acoustic passage plane 741.
[0072] It can be challenging for open-fit ear-wearable devices to produce high-quality sounds
in lower frequencies. This issue can be mitigated by tuning the rear acoustic passage
316. The shape of an acoustic passage can significantly affect the receiver's acoustic
resonance properties and its efficiency in transmitting various acoustic frequencies.
In the examples of FIG. 9-10, the curved shape of the rear acoustic passage 316 allows
for more flexibility in acoustic passage tuning. In various embodiments, the rear
acoustic passage 316 is tuned to increase a low frequency efficiency of the receiver
318. The rear acoustic passage 316 provides an acoustic mass, also known as an acoustic
inertance, to the rear wall of the receiver. Acoustic mass for a cylinder, M, is:

Where:
rho = the density of air,
LE = the effective length of the cylinder after an end-correction, which will be a bit
longer than a cylinder, and
s = the cross-sectional area of the cylinder.
[0073] A longer and narrower cylinder will be "heavy" and provide more resistance to the
travel of sound when compared to a short and wide cylinder with a "light" effect on
the receiver. The acoustic mass together with the rear volume and the receiver's mechanical
stiffness determine a resonant frequency. A design for an ear-wearable device can
have a desired resonant frequency and these parameters can be adjusted to achieve
the desired resonant frequency.
[0074] In some embodiments, the acoustic mass can be greater than or equal to 4000, 7200,
10400, 13600, 16800, or 20000 kg/m
4. In some embodiments, the acoustic mass can be less than or equal to 100000, 84000,
68000, 52000, 36000, or 20000 kg/m
4. In some embodiments, the acoustic mass can fall within a range of 4000 to 100000
kg/m
4, or 7200 to 84000 kg/m
4, or 10400 to 68000 kg/m
4, or 13600 to 52000 kg/m
4, or 16800 to 36000 kg/m
4, or can be about 20000 kg/m
4.
[0075] In one example, the length of the rear acoustic passage 316 as defined herein is
the distance between the rear acoustic inlet 422 and the receiver inlet 840 and can
include the first axial portion 739, second axial portion 841, and the curved portion
944. In some embodiments, the length of the rear acoustic passage can be greater than
or equal to 9 mm, 11 mm, 12 mm, 14 mm, 16 mm, 17 mm, or 19 mm. In some embodiments,
the length of the rear acoustic passage can be less than or equal to 29 mm, 27 mm,
26 mm, 24 mm, 22 mm, 21 mm, or 19 mm. In some embodiments, the length of the rear
acoustic passage can fall within a range of 9 mm to 29 mm, or 11 mm to 27 mm, or 12
mm to 26 mm, or 14 mm to 24 mm, or 16 mm to 22 mm, or 17 mm to 21 mm, or can be about
19 mm.
[0076] In the context of the present application, the cross-sectional area of the rear acoustic
passage 316 is determined by its diameter, which is labeled D
AP in FIG. 9. In some embodiments, the diameter can be greater than or equal to 0.3
mm, 0.4 mm, 0.6 mm, 0.8 mm, 0.9 mm, 1.0 mm, or 1.2 mm. In some embodiments, the diameter
can be less than or equal to 5.0 mm, 4.4 mm, 3.7 mm, 3.1 mm, 2.5 mm, 1.8 mm, or 1.2
mm. In some embodiments, the diameter can fall within a range of 0.3 mm to 5.0 mm,
or 0.4 mm to 4.4 mm, or 0.6 mm to 3.7 mm, or 0.8 mm to 3.1 mm, or 0.9 mm to 2.5 mm,
or 1.0 mm to 1.8 mm, or can be about 1.2 mm.
[0077] In various embodiments, the ratio of length to diameter can play a key role in the
resonance properties of the rear acoustic passage 316. In some embodiments, the ratio
of length to diameter can be greater than or equal to 6, 8, 10, 12, 14, or 16. In
some embodiments, the ratio of length to diameter can be less than or equal to 26,
24, 22, 20, 18, or 16. In some embodiments, the ratio of length to diameter can fall
within a range of 6 to 26, or 8 to 24, or 10 to 22, or 12 to 20, or 14 to 18, or can
be about 16.
Earbud Configuration (FIG. 11)
[0078] Referring now to FIG. 11, a cross-sectional view of an earbud is shown in accordance
with various embodiments herein. In various embodiments, the earbud 104 can have a
first earbud portion 1141 and a second earbud portion 1143. In various embodiments,
the earbud 104 is configured to be removably attachable to the stem 842 of the receiver
housing 109 at the first earbud portion 1141. The removable attachability of the earbud
104 from the receiver housing 109 facilitates easy cleaning and replacement of the
earbud 104. In various embodiments, the first earbud portion 1141 can include one
or more retention features 1148 such that the earbud stays securely attached to the
stem of the receiver housing 109. For instance, the first earbud portion 1141 can
include a flange configured to snap onto a corresponding groove on the stem 842 of
the receiver housing 109. In some embodiments, the retention features 1148 are further
configured to hold the first earbud mesh layer 632 in place within the earbud 104.
In various embodiments the first earbud portion 1141 can be constructed from any suitable
material or materials with sufficient ductility to snap onto the receiver housing,
but sufficient rigidity to maintain its shape including, but not limited to silicone,
urethane, acrylates, flexible epoxy, acrylate urethane, and combinations thereof.
[0079] In various embodiments, the earbud 104 can include a second earbud portion 1143.
The second earbud portion 1143 can be permanently attached to the first earbud portion
1141 by any suitable means such as welding, adhesives, or the like. In various embodiments,
the second earbud portion 1143 can be constructed from a less rigid material than
the first earbud portion 1141. In various embodiments, the second earbud portion 1143
is made from a material and constructed so that it uniformly conforms to the ear canal
and maintains a constant and comfortable radial pressure on the ear canal. In various
examples, the second earbud portion 1143 is made of resilient material, such as silicone.
In various examples, the second earbud portion 1143 is made of a flexible material.
By flexible material, it is meant that a material is capable of bending easily without
breaking. In various examples, the second earbud portion 1143is made of an elastomeric
material. By elastomeric material, it is meant a material with viscoelasticity that
is soft and deformable at ambient temperatures, such as rubber, silicone, and amorphous
polymers. In alternative embodiments, the second earbud portion 1143 can be constructed
from the same material as the first earbud portion 1141.
[0080] In various embodiments, the earbud 104 can include an axial wall 1150 defining an
earbud acoustic channel 1152. The earbud acoustic channel 1152 can be in acoustic
communication with the front acoustic passage 844. The earbud acoustic channel 1152
terminates at acoustic outlet 321. In various embodiments, the axial wall 1150 is
formed partially from the first earbud portion 1141 and partially from the second
earbud portion 1143.
[0081] In various embodiments, the second earbud portion 1143 can form an outer dome 1138.
The outer dome can be connected to the axial wall 1150 at flexible tip portion 1146
of the earbud. The outer dome can be unconnected to the axial wall at a rear edge
1154 of the earbud to further enhance the complaint fit of the earbud.
[0082] In various embodiments, the earbud can include a plurality of vent openings 1142
defined in the axial wall 1150. The earbud can include any suitable number, shape,
and configuration of vent openings 1142 defined in the axial wall 1150 such as one,
two, three, four, or more vent openings. In various embodiments, the plurality of
vent openings 1142 are configured to give the earbud 104 an open fit. Unlike traditional
in-ear earphones, which create a seal inside the ear canal to isolate the ear canal
from external sounds, open-fit earbuds allow some ambient noise to pass through. Open
fit devices can be prone to "tinny" audio (e.g., attenuation of low frequency sound).
This problem is remedied in part by the tuned rear acoustic passage 316 and in part
by providing an open-fit ear bud so that the wearer can hear ambient noise (e.g.,
a natural version of their own voice). In various embodiments ambient sounds can follow
an acoustic path such as exemplary path 1156. For instance, ambient sounds can enter
the earbud 104 through the open end of the outer dome 1138 at the rear edge 1154,
pass through the earbud acoustic channel 1152 through one of the vent openings 1142,
and then enter the wearer's ear though the acoustic outlet 321. In alternate configurations,
the earbud 104 can be devoid of vent openings 1142 and provide a closed fit.
[0083] In the example of FIG. 11, the earbud 104 is devoid of vent openings 1142 on the
outer dome 1138. Accordingly, when viewing the earbud 104 from the outside, it will
appear to have a closed fit. Such a configuration is advantageous because vent openings
1142 on an outer surface of the earbud 104 would be occluded by the user's ear canal
and could provide an inlet for foreign matter to the earbud 104.
[0084] It should be noted that, as used in this specification and the appended claims, the
singular forms "a," "an," and "the" include plural referents unless the content clearly
dictates otherwise. It should also be noted that the term "or" is generally employed
in its sense including "and/or" unless the content clearly dictates otherwise.
[0085] It should also be noted that, as used in this specification and the appended claims,
the phrase "configured" describes a system, apparatus, or other structure that is
constructed or configured to perform a particular task or adopt a particular configuration.
The phrase "configured" can be used interchangeably with other similar phrases such
as arranged and configured, constructed and arranged, constructed, manufactured and
arranged, and the like.
[0086] All publications and patent applications in this specification are indicative of
the level of ordinary skill in the art to which this invention pertains. All publications
and patent applications are herein incorporated by reference to the same extent as
if each individual publication or patent application was specifically and individually
indicated by reference.
[0087] As used herein, the recitation of numerical ranges by endpoints shall include all
numbers subsumed within that range (e.g., 2 to 8 includes 2.1, 2.8, 5.3, 7, etc.).
[0088] The headings used herein are provided for consistency with suggestions under 37 CFR
1.77 or otherwise to provide organizational cues. These headings shall not be viewed
to limit or characterize the invention(s) set out in any claims that may issue from
this disclosure. As an example, although the headings refer to a "Field," such claims
should not be limited by the language chosen under this heading to describe the so-called
technical field. Further, a description of a technology in the "Background" is not
an admission that technology is prior art to any invention(s) in this disclosure.
Neither is the "Summary" to be considered as a characterization of the invention(s)
set forth in issued claims.
[0089] The embodiments described herein are not intended to be exhaustive or to limit the
invention to the precise forms disclosed in the following detailed description. Rather,
the embodiments are chosen and described so that others skilled in the art can appreciate
and understand the principles and practices. As such, aspects have been described
with reference to various specific and preferred embodiments and techniques. However,
it should be understood that many variations and modifications may be made while remaining
within the spirit and scope herein.
[0090] The invention relates, inter alia, to the following aspects:
- 1. An ear-wearable device comprising a receiver assembly, wherein the receiver assembly
comprises:
- a. a receiver housing, the receiver housing comprising:
a front housing portion comprising a front housing wall;
a rear housing portion comprising a rear housing wall, wherein the rear housing wall
defines a rear acoustic inlet;
- b. a receiver configured to convert electrical signals into sounds;
- c. an insert configured to fit within the receiver housing and defining a first insert
opening, the insert comprising a first insert side facing the front housing portion
and a second insert side facing the rear housing wall; and
- d. a rear acoustic passage defined between the rear housing wall and the second insert
side, the rear acoustic passage extending between the rear acoustic inlet and a receiver
inlet disposed adjacent to the first insert opening;
wherein the receiver is configured to fit within the receiver housing between the
front housing portion and the first insert side;
wherein a front housing volume is formed between a receiver front side and the front
housing wall; and
wherein the receiver housing is configured to permit fluid communication between an
external environment and the receiver rear side through the rear acoustic inlet and
the rear acoustic passage.
- 2. The ear-wearable device of any of claim 1, the front housing portion further comprising
a stem protruding from the front housing wall, the stem defining a stem acoustic channel.
- 3. The ear-wearable device of any of claims 1-2, further comprising an earbud configured
to removably attach to the stem of the receiver housing, the earbud comprising:
an axial wall defining an earbud acoustic channel; wherein the earbud acoustic channel
is in acoustic communication with the stem acoustic channel; and
an outer dome connected to the axial wall at a front edge and unconnected to the axial
wall at a rear edge.
- 4. The ear-wearable device of any of the preceding claims, the earbud further comprising
a plurality of vent openings defined in the axial wall.
- 5. The ear-wearable device of any of the preceding claims, the axial wall comprising:
a first portion comprising a first material, the first portion defining retention
features configured to removably attach to the stem of the receiver housing; and
a second portion comprising a second material configured to conform to an ear of a
wearer, wherein the second material is more complaint than the first material.
- 6. The ear-wearable device of any of the preceding claims, the rear housing portion
further comprising an ambient opening defined in the rear housing wall, wherein the
ambient opening is configured to be in fluid communication with a rear side of the
receiver.
- 7. The ear-wearable device of any of the preceding claims, wherein the insert further
defines a second insert opening in acoustic communication with the ambient opening.
- 8. The ear-wearable device of any of the preceding claims, further comprising:
- a. a first mesh layer having a first set of acoustic properties, wherein the first
mesh layer is configured to cover the ambient opening; and
- b. a second mesh layer having a second set of acoustic properties, wherein the second
mesh layer is configured to cover the ambient opening and the rear acoustic inlet;
and
- c. wherein the first mesh layer is configured to provide more acoustic damping than
the second mesh layer.
- 9. The ear-wearable device of any of the preceding claims, wherein the rear acoustic
passage comprises a curved portion between the rear acoustic inlet and the receiver
inlet.
- 10. The ear-wearable device of any of the preceding claims, wherein the curved portion
of the rear acoustic passage comprises an arc-shaped trajectory in a plane parallel
to at least a portion of the rear housing wall.
- 11. The ear-wearable device of any of the preceding claims, the rear acoustic passage
comprising:
a first axial portion extending away from the rear acoustic inlet to a first plane;
a second axial portion extending from the first plane to the receiver inlet; and
a curved portion spanning between the first vertical portion and the second vertical
portion, wherein the curved portion makes an arc-shaped trajectory intersecting the
first plane.
- 12. The ear-wearable device of any of the preceding claims, wherein the rear acoustic
passage is tuned to increase a low frequency efficiency of the receiver.
- 13. The ear-wearable device of any of the preceding claims, wherein the receiver comprises
a moving coil receiver.
- 14. An ear-wearable device comprising a receiver assembly, the receiver assembly comprising:
- a) a receiver configured convert electrical signals into sounds, the receiver comprising
a front side and a receiver rear side,
- b) a receiver housing comprising:
a front housing portion comprising a front housing wall;
a rear housing portion comprising a rear housing wall, wherein the rear housing wall
defines a rear acoustic inlet;
a rear acoustic passage defined adjacent to the rear housing wall, the rear acoustic
passage extending between the rear acoustic inlet and a receiver inlet;
wherein the receiver is configured to fit within the receiver housing between the
front housing portion and the rear housing portion;
wherein a front housing volume is formed between the receiver front side and the front
housing wall;
wherein the receiver housing is configured to permit fluid communication between an
external environment and the receiver rear side through the rear acoustic inlet and
the rear acoustic passage; and
wherein the rear acoustic passage comprises a curved portion between the rear acoustic
inlet and the receiver inlet.
- 15. The ear-wearable device of any of claim 14, the rear housing portion further comprising
an ambient opening defined in the rear housing wall, wherein the ambient opening is
configured to be in fluid communication with a rear side of the receiver.
- 16. The ear-wearable device of any of claims 14-15, further comprising:
- a. a first mesh layer having a first set of acoustic properties, wherein the first
mesh layer is configured to cover the ambient opening; and
- b. a second mesh layer having a second set of acoustic properties, wherein the second
mesh layer is configured to cover the ambient opening and the rear acoustic inlet;
and
- c. wherein the first mesh layer is configured to provide more acoustic damping than
the second mesh layer.
- 17. The ear-wearable device of any of claims 14-16, wherein the curved portion of
the rear acoustic passage comprises an arc-shaped trajectory in a plane parallel to
at least a portion of the rear housing wall.
- 18. The ear-wearable device of any of claims 14-17, the rear acoustic passage comprising:
a first axial portion extending away from the rear acoustic inlet to a first plane;
a second axial portion extending from the first plane to the receiver inlet; and
the curved portion spanning between the first vertical portion and the second vertical
portion, wherein the curved portion makes an arc-shaped trajectory intersecting the
first plane.
- 19. The ear-wearable device of any of claims 14-18, wherein the rear acoustic passage
is tuned to increase a low frequency efficiency of the receiver.
- 20. An ear-wearable device comprising a receiver assembly, wherein the receiver assembly
comprises:
- a. a receiver housing, the receiver housing comprising a rear housing wall, wherein
the rear housing wall defines a rear acoustic inlet,
- b. a receiver configured convert electrical signals into sounds and configured to
fit within the receiver housing;
- c. a rear acoustic passage at least partially defined between a first housing component
and a second housing component, wherein the first housing component and a second housing
component are separately manufactured and then are assembled to form at least a portion
of the receiver assembly, wherein the rear acoustic passage extends between the rear
acoustic inlet and a rear cavity adjacent to a receiver rear side;
wherein the receiver housing is configured to permit fluid communication between an
external environment and the rear cavity through the rear acoustic inlet and the rear
acoustic passage.