(19)
(11)EP 2 991 377 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
04.12.2019 Bulletin 2019/49

(21)Application number: 14788772.3

(22)Date of filing:  23.04.2014
(51)Int. Cl.: 
H04R 25/02  (2006.01)
H04R 17/00  (2006.01)
(86)International application number:
PCT/JP2014/062035
(87)International publication number:
WO 2014/175464 (30.10.2014 Gazette  2014/44)

(54)

ACOUSTIC APPARATUS

AKUSTISCHE VORRICHTUNG

APPAREIL ACOUSTIQUE


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 26.04.2013 JP 2013094436

(43)Date of publication of application:
02.03.2016 Bulletin 2016/09

(73)Proprietor: Kyocera Corporation
Kyoto-shi Kyoto 612-8501 (JP)

(72)Inventor:
  • INAGAKI, Tomohiro
    Kyoto-shi Kyoto 612-8501 (JP)

(74)Representative: SSM Sandmair 
Patentanwälte Rechtsanwalt Partnerschaft mbB Joseph-Wild-Straße 20
81829 München
81829 München (DE)


(56)References cited: : 
EP-A1- 3 010 248
WO-A1-2012/021424
JP-A- 2005 348 193
JP-A- 2007 165 938
JP-A- 2012 204 855
US-A- 2 470 933
WO-A1-2008/029515
JP-A- 2003 264 882
JP-A- 2007 103 989
JP-A- 2009 302 815
JP-A- 2013 078 116
US-A1- 2007 025 574
  
  • Murata: "Piezoelectric Sound Components", , 11 October 2003 (2003-10-11), XP055315782, Retrieved from the Internet: URL:https://web.archive.org/web/2003101116 0542/http://www.aurelienr.com/electronique /piezo/applic.pdf [retrieved on 2016-11-02]
  
Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


Description

TECHNICAL FIELD



[0001] This disclosure relates to an acoustic device, such as a hearing aid.

BACKGROUND



[0002] In one type of acoustic device, such as an open fitting hearing aid, a vent connecting the inside of the external ear canal to the outside is provided to alleviate an occlusion effect when wearing the hearing aid (for example, see JP 2006-304147 A (PTL 1)). This type of hearing aid includes a microphone, an earphone, and a vent. The microphone collects sound from a sound source, and the earphone causes the user to hear the sound collected by the microphone. The vent is a hole connecting the inside of the external ear canal to the outside, as described above. As a result of the vent, the external ear canal is not completely sealed. Therefore, the occlusion effect that occurs when wearing the hearing aid is alleviated.

[0003] WO 2012/021424 A1 discloses an acoustic device configured to be entirely supported by one ear of a user, comprising a piezoelectric vibration unit pressing the tragus from the inside or the outside of the ear. WO 2012/021424 A1 further suggests to have a curved vibrator to follow the morphology of the ear part to be contacted.

[0004] JP 2005-348193 A discloses an acoustic device to be worn on two ears, comprising a piezoelectric vibration unit with a vibrating panel having one portion in contact with the tragus and one portion not in contact with the ear, in order to generate both cartilage-conducted sound and air-conducted sound.

CITATION LIST


Patent Literature



[0005] PTL 1: JP 2006-304147 A

SUMMARY


(Technical Problem)



[0006] In this open fitting hearing aid, however, low-frequency sound among the sound produced by the earphone escapes to the outside through the vent. Therefore, the sound pressure of low-frequency sound decreases, impairing a sense of volume. Reducing the diameter of the vent in order to prevent low-frequency sound from escaping, however, brings about an occlusion effect, thereby impairing a sense of comfort when wearing the hearing aid.

[0007] It would therefore be helpful to provide an acoustic device that can suppress a loss in sense of volume and sense of comfort, two features which are difficult to combine.

(Solution to Problem)



[0008] In order to solve the above problem, an acoustic device according to claim 1 is proposed.

[0009] In the acoustic device, the concavity in the panel may contact the user's tragus from outside the user's ear and transmit vibration of the panel to the tragus.

[0010] In the acoustic device, the concavity in the panel may contact the user's antitragus from outside the user's ear and transmit vibration of the panel to the antitragus.

[0011] The acoustic device may be configured not to completely seal the user's external ear canal.

[0012] In the acoustic device, the panel may vibrate with an antinode at a central region of the panel and a node on both sides of the antinode, and
a location at the central region of the panel may contact the tragus.

[0013] In the acoustic device, the panel may vibrate with an antinode at a central region of the panel and a node on both sides of the antinode, and
a location at the central region of the panel may contact the antitragus.

[0014] The acoustic device may further include a microphone.

[0015] In the acoustic device, the vibration unit may generate an external ear canal radiated sound inside the user's ear.

[0016] In the acoustic device, the piezoelectric element may be plate-shaped, and
the panel may have an area between 0.8 and 10 times an area of a principal surface of the piezoelectric element.

(Advantageous Effect)



[0017] This acoustic device can suppress a loss in sense of volume and sense of comfort.

BRIEF DESCRIPTION OF THE DRAWINGS



[0018] In the accompanying drawings:

FIG. 1 is a block diagram illustrating a hearing aid according to one of the disclosed embodiments;

FIG. 2 schematically illustrates flexure of a panel and a piezoelectric element in a hearing aid according to one of the disclosed embodiments;

FIG. 3 schematically illustrates the structure of a hearing aid according to one of the disclosed embodiments;

FIG. 4 illustrates the portion of a hearing aid according to one of the disclosed embodiments that is in contact with the tragus;

FIG. 5 is a side view in the thickness direction of a vibration unit;

FIG. 6 schematically illustrates transmission of sound from a hearing aid according to one of the disclosed embodiments;

FIGS. 7(a) through 7(d) schematically illustrate acoustic characteristics of various paths;

FIG. 8 illustrates measured values of the acoustic characteristics of a hearing aid according to one of the disclosed embodiments;

FIGS. 9(a) and 9(b) illustrate measured values in the case of providing a convexity instead of a concavity; and

FIG. 10 illustrates a comparison of measured values in the cases of providing a concavity and a convexity.


DETAILED DESCRIPTION



[0019] The following describes embodiments of the disclosed device.

(Embodiment)



[0020] FIG. 1 is a block diagram of an acoustic device 1 according to one of the disclosed embodiments. The acoustic device 1 is, for example, a hearing aid 1 and includes a vibration unit 10, a microphone 20, a controller 30, an adjustment interface 40, and a memory 50.

[0021] The vibration unit 10 includes a piezoelectric element 101 that flexes and a panel 102 that vibrates by being bent directly by the piezoelectric element 101. FIG. 2 schematically illustrates flexing of the panel 102 due to the piezoelectric element 101. The vibration unit 10 causes the user to hear air-conducted sound and human body vibration sound due to vibration. Air-conducted sound is sound transmitted to the user's auditory nerve by air vibrations, caused by a vibrating object, that are transmitted through the external ear canal to the eardrum and cause the eardrum to vibrate. Human body vibration sound is sound that is transmitted to the user's auditory nerve through a portion of the user's body (such as the cartilage of the outer ear) that is contacting a vibrating object.

[0022] The piezoelectric element 101 is formed by elements that, upon application of an electric signal (voltage), either expand and contract or bend (flex) in accordance with the electromechanical coupling coefficient of their constituent material. Ceramic or crystal elements, for example, may be used. The piezoelectric element 101 may be a unimorph, bimorph, or laminated piezoelectric element. Examples of a laminated piezoelectric element include a laminated unimorph element with layers of unimorph (for example, 16 or 24 layers) and a laminated bimorph element with layers of bimorph (for example, 16 or 24 layers). Such a laminated piezoelectric element may be configured with a laminated structure formed by a plurality of dielectric layers composed of, for example, lead zirconate titanate (PZT) and electrode layers disposed between the dielectric layers. Unimorph expands and contracts upon the application of an electric signal (voltage), and bimorph bends upon the application of an electric signal (voltage).

[0023] The panel 102 is, for example, made from glass or a synthetic resin such as acrylic or the like. An exemplary shape of the panel 102 is a plate, and the shape of the panel 102 is described below as being a plate.

[0024] The microphone 20 collects sound from a sound source, namely sound reaching the user's ear.

[0025] The controller 30 executes various control pertaining to the hearing aid 1. The controller 30 applies a predetermined electric signal (a voltage corresponding to a sound signal) to the piezoelectric element 101. In greater detail, in the controller 30, an A/D converter 31 converts a sound signal collected by the microphone 20 into a digital signal. Based on information on volume, sound quality, and the like from the adjustment interface 40 for volume and sound quality and on information stored in the memory 50, a signal processor 32 outputs a digital signal that drives the vibration unit 10. A D/A converter 33 converts the digital signal to an analog electric signal, which is then amplified by a piezoelectric amplifier 34. The resulting electric signal is applied to the piezoelectric element 101. The voltage that the controller 30 applies to the piezoelectric element 101 may, for example, be ±15 V. This is higher than ±5 V, i.e. the applied voltage of a so-called panel speaker for conduction of sound by air-conducted sound rather than human body vibration sound. In this way, sufficient vibration is generated in the panel 102, so that a human body vibration sound can be generated via a part of the user's body. Note that the magnitude of the applied voltage used may be appropriately adjusted in accordance with the fixation strength of the panel 102 or the performance of the piezoelectric element 101. Upon the controller 30 applying the electric signal to the piezoelectric element 101, the piezoelectric element 101 expands and contracts or bends in the longitudinal direction.

[0026] At this point, the panel 102 to which the piezoelectric element 101 is attached vibrates by deforming in conjunction with the expansion and contraction or bending of the piezoelectric element 101. The panel 102 flexes due to expansion and contraction or to bending of the piezoelectric element 101. The panel 102 is bent directly by the piezoelectric element 101. Stating that "the panel 102 is bent directly by the piezoelectric element 101" differs from the phenomenon utilized in known panel speakers, whereby the panel 102 deforms upon vibration of a particular region of the panel 102 due to the inertial force of a piezoelectric actuator constituted by disposing the piezoelectric element 101 in the casing. Stating that "the panel 102 is bent directly by the piezoelectric element 101" refers instead to how expansion and contraction or bending (flexure) of the piezoelectric element 101 directly bends the panel 102 via the joining member.

[0027] Since the panel 102 vibrates as described above, the panel 102 generates air-conducted sound, and when the user contacts the panel 102 to the tragus, the panel 102 generates human body vibration sound via the tragus. The panel 102 preferably vibrates with locations near the edges of the panel 102 as nodes and the central region as an antinode, and a location at the central region of the panel 102 preferably contacts the tragus or antitragus. As a result, vibration of the panel 102 can be efficiently transmitted to the tragus or the antitragus.

[0028] FIG. 3 schematically illustrates the structure of the hearing aid 1 according to one of the disclosed embodiments. As illustrated in FIG. 3, the vibration unit 10 is contacted to the user's tragus from outside the user's ear. Therefore, a holder 60 is provided. From a different angle, FIG. 4 illustrates the vibration unit 10 in contact with the tragus. As illustrated in FIG. 4, the vibration unit 10 contacts the protruding tragus, and therefore by providing the below-described concavity 104 at the position of contact with the tragus, the area of contact between the vibration unit 10 and the tragus can be sufficiently insured without crushing the tragus. In this embodiment, an example is described in which the position of contact with the user's ear is the tragus.

[0029] As illustrated in FIG. 3, the holder 60 includes a support 61, an ear hook 62, and a body 63. The holder 60 holds the vibration unit 10 at the position at which the vibration unit 10 contacts the user's ear (at the tragus). One end of the support 61 is connected to the vibration unit 10. The support 61 has a hollow structure, and a lead wire is fed to the vibration unit 10 through this hollow structure. The support 61 is rigid enough so that the angle of the vibration unit 10 does not change. The other end of the support 61 is connected to one end of the ear hook 62.

[0030] The ear hook 62 contacts the outside of the user's auricle to mount the hearing aid 1 in the user's ear. The ear hook 62 is preferably shaped as a hook conforming to the user's auricle so as to mount the hearing aid 1 stably in the user's ear. The other end of the ear hook 62 is connected to the body 63. The body 63 stores the microphone 20, controller 30, adjustment interface 40, and memory 50 therein.

[0031] FIG. 5 is a side view of the vibration unit 10 as viewed in the thickness direction. As described above, the vibration unit 10 includes the piezoelectric element 101 and the panel 102. The piezoelectric element 101 is preferably shaped as a plate, as in FIG. 5.

[0032] The piezoelectric element 101 is joined to the panel 102 by a joining member. The joining member is disposed between the principal surface of the piezoelectric element 101 and the principal surface of the panel 102. The joining member is preferably a non-heat hardening adhesive material or double-sided tape. Apart from the surface joined to the panel 102, the piezoelectric element 101 is covered by a mold 103.

[0033] The principle surface of the panel 102 includes the concavity 104. The concavity 104 is a recessed portion in the central region of the panel 102. Since the tragus projects outward, it is necessary to secure the area of contact by crushing the tragus when contacting a flat surface thereto. Conversely, since the hearing aid 1 includes the concavity 104, and this concavity 104 contacts the tragus, the area of contact can be secured without crushing the tragus. Since it is not necessary to crush the tragus, the holder 60 can have a simple structure. Furthermore, since the tragus is not crushed, a sense of comfort can be maintained when the user wears the hearing aid 1.

[0034] The panel 102 of the vibration unit 10 is pressed against the user's ear with a force of 0.1 N to 3 N. If the panel 102 is pressed with a force between 0.1 N and 3 N, vibration by the panel 102 is sufficiently transmitted to the ear. Furthermore, if the pressure is a small force of less than 3 N, the user suffers little fatigue even when wearing the hearing aid 1 for an extended period of time, thus maintaining a sense of comfort when wearing the hearing aid 1.

[0035] The concavity 104 of the panel 102 includes a portion that contacts the user's ear (the tragus or the antitragus) and a portion that does not contact the user's ear. By providing a portion that does not contact the user's ear within the panel 102, it may be possible to generate air-conducted sound from this portion.

[0036] The principal surface of the panel 102 preferably has an area between 0.8 and 10 times the area of the principal surface of the piezoelectric element 101. If the principal surface of the panel 102 has an area between 0.8 and 10 times the area of the principal surface of the piezoelectric element 101, the panel 102 can deform in conjunction with expansion and contraction or bending of the piezoelectric element 101, and the area of contact with the user's ear can be sufficiently guaranteed. The area of the panel is, for example, more preferably between 0.8 and 5 times the area of the piezoelectric element.

[0037] Next, the acoustic characteristics of the hearing aid 1 according to one of the disclosed embodiments are described with reference to FIGS. 6 through 8.

[0038] FIG. 6 schematically illustrates transmission of sound from the hearing aid 1 according to one of the disclosed embodiments. In FIG. 6, the only illustrated portions of the hearing aid 1 are the vibration unit 10 and the microphone 20. The microphone 20 collects sound from a sound source. By vibrating, the vibration unit 10 causes the user to hear the sound collected by the microphone 20.

[0039] As illustrated in FIG. 6, sound from the sound source passes through the external ear canal from a portion not covered by the vibration unit 10 and reaches the eardrum directly (path I). Air-conducted sound due to vibration of the vibration unit 10 also passes through the external ear canal and reaches the eardrum (path II). Due to the vibration of the vibration unit 10, the external ear canal vibrates, and sound due to this vibration of the external ear canal (external ear canal radiated sound) reaches the eardrum (path III). Furthermore, human body vibration sound due to the vibration of the vibration unit 10 reaches the auditory nerve directly without passing through the eardrum (path IV). A portion of the air-conducted sound produced by the vibration unit 10 escapes to the outside (path V).

[0040] FIGS. 7(a) through 7(d) schematically illustrate the acoustic characteristics of the various paths. FIG. 7(a) illustrates the acoustic characteristics of sound by path I, and FIG. 7(b) illustrates the acoustic characteristics of sound by path II and path III. For the sound by path II and path III, the sound pressure in the low-frequency sound region is low, since low-frequency sound escapes by path V. FIG. 7(c) illustrates the acoustic characteristics of path IV. As illustrated in FIG. 7(c), in the human body vibration sound, the sound pressure of low-frequency sound is high, and low-frequency sound can be transmitted well. FIG. 7(d) illustrates the acoustic characteristics for a combination of sounds by paths I through IV, i.e. the actual acoustic characteristics heard by a user wearing the hearing aid 1. As illustrated in FIG. 7(d), even though sound pressure of low-frequency sound escapes to the outside by path V, the sound pressure of low-frequency sound, namely sound pressure of low-frequency sound at 1 kHz or less in this embodiment, can be guaranteed by the human body vibration sound, thereby maintaining a sense of volume.

[0041] FIG. 8 illustrates measured values of the frequency characteristics of the hearing aid 1. In FIG. 8, "air" represents the frequency characteristics of sound by path II and path III in FIG. 6, and "vib" represents the frequency characteristics of sound by path IV in FIG. 6. Furthermore, "air+vib" represents the frequency characteristics of sound yielded by combining the sound of path II through path IV. As indicated by these measurement values, the sound pressure of low-frequency sound, namely sound pressure of low-frequency sound at 1 kHz or less in this embodiment, can be guaranteed by the human body vibration sound, thereby suppressing a loss in the sense of volume.

[0042] FIG. 9(b) illustrates measured values in the case of providing a convexity 105 instead of the concavity 104 in the panel 102 (FIG. 9(a)). In FIG. 9(b), "air" represents the frequency characteristics of sound by path II and path III in FIG. 6, and "vib" represents the frequency characteristics of sound by path IV in FIG. 6. Furthermore, "air+vib" represents the frequency characteristics of sound yielded by combining the sound of path II through path IV. FIG. 10 illustrates the frequency characteristics of "air+vib" for each of the cases of providing the concavity 104 and the convexity 105 in the panel 102. As illustrated in FIG. 10, the structure in which the concavity 104 is provided in the panel 102 has a higher sound pressure in numerous frequency ranges, yielding excellent acoustic characteristics.

[0043] While an example in which the acoustic device is a hearing aid 1 has been described in this embodiment, this example is not limiting. For example, the acoustic device may be a headphone or earphone, in which case the microphone 20 is not provided. In this case, the acoustic device may reproduce sound based on music data stored in an internal memory of the acoustic device or sound based on music data stored on an external server or the like and transmitted over a network.

[0044]  "Contacting to the user's tragus or antitragus from outside the user's ear" refers to contacting the vibration unit 10 to the tragus or antitragus approximately in parallel with the cheek or temple, without burying the vibration unit 10 in the external ear canal.

REFERENCE SIGNS LIST



[0045] 
1
Acoustic device (hearing aid)
10
Vibration unit
20
Microphone
30
Controller
31
A/D converter
32
Signal processor
33
D/A converter
34
Piezoelectric amplifier
40
Adjustment interface
50
Memory
60
Holder
61
Support
62
Ear hook
63
Body
101
Piezoelectric element
102
Panel
103
Mold
104
Concavity
105
Convexity



Claims

1. An acoustic device configured to be entirely supported by one ear of a user comprising:

a vibration unit including a piezoelectric element configured to flex and a panel configured to vibrate by being bent directly by the piezoelectric element; an ear hook configured to contact the outside of a user's auricle; a support including a first end connected to the vibration unit and a second end connected to a first end of the ear hook; and a body connected to a second end of the ear hook,

characterised in that

the panel includes a concavity,

the concavity including a first portion configured to contact a user's tragus or antitragus directly from outside of the user's ear and a second portion configured not to contact the user's ear, wherein the first portion is configured to vibrate the user's auricle by pressing the user's tragus or antitragus directly from outside of the user's ear with a force of 0.1 N to 3 N to cause the user to hear sound.


 
2. The acoustic device of claim 1, wherein the first portion is configured to contact the user's tragus from outside the user's ear and to transmit vibration of the panel to the tragus.
 
3. The acoustic device of claim 1, wherein the first portion is configured to contact the user's antitragus from outside the user's ear and to transmit vibration of the panel to the antitragus.
 
4. The acoustic device of claim 1, wherein the acoustic device is configured to not completely seal the user's external ear canal.
 
5. The acoustic device of claim 1, further comprising a microphone.
 
6. The acoustic device of claim 1, wherein the piezoelectric element is plate-shaped, and the panel has an area between 0.8 and 10 times an area of a principal surface of the piezoelectric element.
 


Ansprüche

1. Akustische Vorrichtung, die konfiguriert ist, vollständig von einem Ohr eines Benutzers unterstützt zu werden, umfassend:

eine Vibrationseinheit, umfassend ein piezoelektrisches Element, das konfiguriert ist, sich zu biegen, und eine Platte, die konfiguriert ist, dadurch, dass sie direkt von dem piezoelektrischen Element gebogen wird, zu vibrieren; einen Ohrbügel, der konfiguriert ist, die Außenseite der Ohrmuschel eines Benutzers zu kontaktieren; eine Unterstützung, umfassend ein erstes Ende, das mit der Vibrationseinheit verbunden ist, und ein zweites Ende, das mit einem ersten Ende des Ohrbügels verbunden ist; und einen Körper, der mit einem zweiten Ende des Ohrbügels verbunden ist,

dadurch gekennzeichnet, dass

die Platte eine Höhlung umfasst,

wobei die Höhlung einen ersten Abschnitt, der konfiguriert ist, direkt von der Außenseite des Ohrs des Benutzers den Tragus oder Antitragus eines Benutzers zu kontaktieren, und einen zweiten Abschnitt, der konfiguriert ist, das Ohr des Benutzers nicht zu kontaktieren, umfasst, wobei der erste Abschnitt konfiguriert ist, die Ohrmuschel des Benutzers durch Drücken des Tragus oder Antitragus des Benutzers mit einer Kraft von 0,1 N bis 3 N direkt von der Außenseite des Ohrs des Benutzers vibrieren zu lassen, damit der Benutzer Schall hört.


 
2. Akustische Vorrichtung nach Anspruch 1, wobei der erste Abschnitt konfiguriert ist, den Tragus des Benutzers von der Außenseite des Ohrs des Benutzers zu kontaktieren und eine Vibration der Platte auf den Tragus zu übertragen.
 
3. Akustische Vorrichtung nach Anspruch 1, wobei der erste Abschnitt konfiguriert ist, den Antitragus des Benutzers von der Außenseite des Ohrs des Benutzers zu kontaktieren und eine Vibration der Platte auf den Antitragus zu übertragen.
 
4. Akustische Vorrichtung nach Anspruch 1, wobei die akustische Vorrichtung konfiguriert ist, den äußeren Gehörgang des Benutzers nicht komplett abzudichten.
 
5. Akustische Vorrichtung nach Anspruch 1, ferner umfassend ein Mikrofon.
 
6. Akustische Vorrichtung nach Anspruch 1, wobei das piezoelektrische Element plattenförmig ist und die Platte einen Bereich aufweist, der zwischen 0,8 und 10 Mal einen Bereich einer Hauptfläche des piezoelektrischen Elements darstellt.
 


Revendications

1. Dispositif acoustique conçu pour être entièrement supporté par l'oreille d'un utilisateur comprenant :

une unité de vibration comprenant un élément piézoélectrique conçu pour fléchir et un panneau conçu pour vibrer en étant courbé directement par l'élément piézoélectrique ; un crochet auriculaire conçu pour entrer en contact avec l'extérieur de l'auricule d'un utilisateur ; un support comprenant une première extrémité reliée à l'unité de vibration et une deuxième extrémité reliée à une première extrémité du crochet auriculaire ; et un corps relié à une deuxième extrémité du crochet auriculaire,

caractérisé en ce que

le panneau comprend une concavité,

la concavité comprenant une première partie conçue pour entrer en contact avec le tragus ou l'antitragus d'un utilisateur directement depuis l'extérieur de l'oreille de l'utilisateur et une deuxième partie conçue pour ne pas entrer en contact avec l'oreille de l'utilisateur, la première partie étant conçue pour faire vibrer l'auricule de l'utilisateur en appuyant sur le tragus ou l'antitragus de l'utilisateur directement depuis l'extérieur de l'oreille de l'utilisateur avec une force de 0,1 N à 3 N pour amener l'utilisateur à entendre un son.


 
2. Dispositif acoustique selon la revendication 1, dans lequel la première partie est conçue pour entrer en contact avec le tragus de l'utilisateur depuis l'extérieur de l'oreille de l'utilisateur et pour transmettre une vibration du panneau du tragus.
 
3. Dispositif acoustique selon la revendication 1, dans lequel la première partie est conçue pour entrer en contact avec le tragus de l'utilisateur depuis l'extérieur de l'oreille de l'utilisateur et pour transmettre une vibration du panneau à l'antitragus.
 
4. Dispositif acoustique selon la revendication 1, le dispositif acoustique étant conçu pour ne pas complètement obturer le canal auditif externe de l'utilisateur.
 
5. Dispositif acoustique selon la revendication 1, comprenant en outre un microphone.
 
6. Dispositif acoustique selon la revendication 1, dans lequel l'élément piézoélectrique est en forme de plaque, et le panneau présente une zone d'entre 0,8 et 10 fois une zone d'une surface principale de l'élément piézoélectrique.
 




Drawing

































REFERENCES CITED IN THE DESCRIPTION



This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Patent documents cited in the description