(19)
(11)EP 2 880 872 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
13.01.2021 Bulletin 2021/02

(21)Application number: 13708793.8

(22)Date of filing:  08.03.2013
(51)International Patent Classification (IPC): 
H04R 7/16(2006.01)
(86)International application number:
PCT/EP2013/054741
(87)International publication number:
WO 2014/019717 (06.02.2014 Gazette  2014/06)

(54)

ELECTROACOUSTIC DRIVER

ELEKTROAKUSTISCHER TREIBER

AMPLIFICATEUR ÉLECTROACOUSTIQUE


(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: 31.07.2012 US 201261677899 P

(43)Date of publication of application:
10.06.2015 Bulletin 2015/24

(73)Proprietor: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
80686 München (DE)

(72)Inventors:
  • BEER, Daniel
    98693 Martinroda (DE)
  • EHRIG, Lutz
    01277 Dresden (DE)
  • BETZ, Lorenz
    91717 Wassertruedingen (DE)
  • LEISTNER, Philip
    70569 Stuttgart (DE)
  • BAY, Karlheinz
    70195 Stuttgart (DE)
  • LEISTNER, Michael
    70567 Stuttgart (DE)

(74)Representative: Schenk, Markus 
Schoppe, Zimmermann, Stöckeler Zinkler, Schenk & Partner mbB Patentanwälte Radlkoferstrasse 2
81373 München
81373 München (DE)


(56)References cited: : 
EP-A2- 0 409 429
GB-A- 1 591 183
US-A- 4 379 951
US-A1- 2004 218 778
DE-B3-102005 048 905
GB-A- 1 591 184
US-A1- 2003 194 097
  
  • KLIPPEL, W.: "Active compensation of transducer nonlinearities", AES 23RD INTERNATIONAL CONFERENCE, 23 May 2003 (2003-05-23), XP040374476, Copenhagen, Denmark
  • BAI MINGSIAN R ET AL: "Robust control of a sensorless bass-enhanced moving-coil loudspeaker system", THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, AMERICAN INSTITUTE OF PHYSICS FOR THE ACOUSTICAL SOCIETY OF AMERICA, NEW YORK, NY, US, vol. 105, no. 6, 1 June 1999 (1999-06-01), pages 3283-3289, XP012001010, ISSN: 0001-4966, DOI: 10.1121/1.424656
  • Andrew Bright et Al.: "Active control of loudspeakers: An investigation of practical applications", , 1 January 2002 (2002-01-01), XP055652948, Retrieved from the Internet: URL:https://backend.orbit.dtu.dk/ws/portal files/portal/5483370/60678_Orsted2002_Andr ew+Bright-Active+control+of+loudspeakers-A n+investigation+of+practical+applications. pdf [retrieved on 2019-12-16]
  
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


[0001] Embodiments of the present invention refer to an electroacoustic driver comprising a diaphragm suspension having one or more active elements.

[0002] An electroacoustic driver typically comprises a lightweight diaphragm which may have a circle- or square-shape, as well as a basket, a diaphragm drive system and a diaphragm suspension. The diaphragm suspension is configured to guide the diaphragm along its motion, wherein the diaphragm drive system is configured to subject the diaphragm to the motion or to an oscillation in order to produce a sound in response to an electric audio signal. The diaphragm is typically deflected by using a coil electromagnet acting on a permanent magnet, wherein the coil is coupled to the diaphragm and the permanent magnet is attached to the basket. The diaphragm suspension elastically mounting the diaphragm and the basket may comprise a spider arranged in the middle of the diaphragm and a surround arranged at an edge region of same. The spider and the surround are typically made by a fabric or a rubber which are passive elements. Each of the passive elements may have a spring stiffness influencing the restoring force counteracting to the excursion of the diaphragm. However, such suspensions often cause deficiencies in sound quality because the surround and/or the spider may typically provide a restoring force having a non-linear characteristic. Therefore, there is the need for an approved approach.

[0003] GB 1 591 184 A as well as GB 1 591 183 A describe electroacoustic transducers having more than one voice coil.

[0004] EP 0 409 429 A2 describes a dynamic speaker driven by a constant current amplifier.

[0005] DE 10 2005 048905 B3 describes an attenuator or noise damping apparatus having at least a loudspeaker.

[0006] The object of the invention is to provide an electroacoustic driver having an improved sound behaviour and/or to provide an alternative diaphragm drive system having a reduced complexity of the structure.

[0007] This object is accomplished according to the present invention by an electroacoustic driver according to claim

[0008] Embodiments of the present invention provide an electroacoustic driver comprising a diaphragm, a diaphragm drive system and a diaphragm suspension. The diaphragm drive system is configured to subject the diaphragm to a motion (e.g. of an oscillation). The diaphragm suspension is configured to guide the diaphragm, wherein the diaphragm suspension comprises one or more active elements configured to actively influence the motion of the diaphragm.

[0009] The approach of the present invention takes account of the fact that non-linearities of a transducer are typically caused by the diaphragm suspension, i.e. by the spider and/or by the surround. In order to compensate the non-linearities at source of the spider and/or the surround, the diaphragm suspension comprises one or more active elements, e.g. piezoelectrical devices. These active elements enable to exercise an influence on the parameter interfering with the linearity of the transducer, wherein exerting the influence may be done by overlapping the restoring force (counteracting the excursion of the diaphragm) by an additional force which is generated by the one or more active elements of the diaphragm suspension. i.e. that the motion of the diaphragm may be influenced via the diaphragm suspension or components of the diaphragm suspension such that non-linearities caused by the diaphragm suspension may be compensated. Besides the non-linearities caused by the non-linear restoring force, further non-linearities caused by a magnetic field of the drive system of a moving-coil loudspeaker or caused by external conditions, such as temperature effects, or by aging of the transducer components may be reduced by using the active suspension.

[0010] Furthermore, the approach enables to integrate the diaphragm suspension and the diaphragm drive system (into one unit) in order to reduce the complexity of the structure of the transducer. A further embodiment provides an electroacoustic driver comprising a diaphragm and a surround formed along an edge region of the diaphragm. The diaphragm is configured to move in a direction of a piston-like motion, wherein the surround guides the diaphragm laterally and along the direction of the piston-like motion. The surround is further configured to actively excite the piston-like motion. Therefore, the surround comprises one or more electrical devices or piezoelectrical devices, which are configured to excite a high enough force to the diaphragm in order to subject the diaphragm to the piston-like motion (i.e. without a conventional drive system comprising a voice coil). Expressed in other words, this means that the surround integrates the diaphragm drive system and the diaphragm suspension into one unit.

[0011] The electroacoustic driver comprises, amongst other features, a diaphragm, a basket, a diaphragm drive system and a diaphragm suspension. The diaphragm is configured to move in a direction of a piston-like motion, wherein the diaphragm suspension is configured to guide the diaphragm laterally and along the piston-like motion. The diaphragm drive system is arranged between an edge region of a diaphragm and the basket comprises one or more electrical devices which are configured to subject the diaphragm to a piston-like motion. To increase the diaphragm stroke, the one or more electrical devices may be arranged in series such they form a bellow.

[0012] Furthermore, the one or more electrical devices, for example, being piezoelectrical devices are arranged along the diaphragm suspension, i.e. that the diaphragm drive system is displaced from the middle of the diaphragm to the edge region. According to further embodiments, the diaphragm suspension may be formed by cylinder liner along which the diaphragm performs the piston-like motion.

[0013] Embodiments of the invention will subsequently be discussed referring to the enclosed drawings, wherein:
Fig. 1
shows a schematic representation of an electroacoustic driver comprising a diaphragm drive system and a diaphragm suspension having an active element for actively influencing the motion of the diaphragm according to an embodiment;
Fig. 2a,b
show schematic representations of an electrodynamic driver having the active element, according to Fig. 1, integrated between an edge region of the diaphragm and a basket;
Fig. 2c
shows an exemplary representation of an electrodynamic driver having the active element of Fig. 1 integrated into a surround of the diaphragm;
Fig. 3a,b
show schematic representations of an electroacoustic driver having a diaphragm, a basket and a diaphragm drive and suspension system arranged between an edge region of the diaphragm and the basket;
Fig. 4a,b
show schematic representations of an electroacoustic driver having a diaphragm, a basket and a diaphragm drive and suspension system arranged between an edge region of the diaphragm and the basket;
Fig. 5a,b
show schematic representations of an electroacoustic driver having a diaphragm, a basket, a diaphragm suspension formed by a cylinder liner and a diaphragm drive system arranged between an edge region of the diaphragm and the basket;
Fig. 6a,b
show schematic representations of an electroacoustic driver having a diaphragm, a basket, a diaphragm suspension formed by a cylinder liner and a diaphragm drive system formed by a bellow arranged between an edge region of the diaphragm and the basket; and
Fig. 7a, b
show schematic representations of an electroacoustic driver having a diaphragm, a basket, a diaphragm suspension formed by a piston element and a diaphragm drive system formed by a bellow arranged between an edge region of the diaphragm and the basket.


[0014] Below, different embodiments of the present invention will subsequently be discussed referring to Fig. 1 to Fig. 7. In advance, identical reference numbers are provided to objects having identical or similar functions so that objects referred to by identical reference numerals within the different embodiments are interchangeable and the description thereof is mutually applicable.

[0015] Fig. 1 shows an electroacoustic driver 10 comprising a movable diaphragm 12, e.g. a diaphragm having disc shape or a round paper cone, in a cross-sectional view. The diaphragm 12 is coupled to a diaphragm drive system 14 and elastically coupled (mounted) by a diaphragm suspension 16. The diaphragm suspension 16 may comprise a flexible element, e.g. a surround, arranged between a frame or a basket 17 and the diaphragm 12 to which the flexible element 16 is directly attached. The diaphragm suspension 16 has the purpose to guide the diaphragm 12 laterally and/or along its motion. Furthermore, the diaphragm suspension 16 comprises one or more active elements which comprise electrical or piezoelectrical devices 18, which are integrated into the flexible element 16. Alternatively, the active elements 18 may be formed by a plurality of piezoelectrical strips or piezoelectrical flexure beams. Each of these piezoelectrical strips may be formed by two piezoelectrical strips attached or glued to each other (like bimetal strips). Typically, the diaphragm drive system 14 is also connected to the basket 17 and, thus, configured to subject a relative motion between the diaphragm 12 and the basket 17.

[0016] The motion may be a piston-like motion or a bending-wave motion, or, to be precise, a piston-like or bending-wave oscillation. Therefore, the drive system 14 exerts force to the diaphragm 12 such that the diaphragm 12 performs a positive motion to the front side of the diaphragm 12 or a negative motion to the backside of same. As a consequence of the positive and/or the negative motion the flexible suspension element 16 is deformed. While deforming the flexible element 16, the flexible element counteracts the excursion of the diaphragm 12 with a restoring force. This restoring force is typically dependent on the excursion of the diaphragm 12. However, the relationship between the excursion of the diaphragm 12 and the restoring force shows a non-linear characteristic. These non-linearities especially occurring under dynamic load may lead to deficiencies in sound quality. Furthermore, the non-linear characteristic starts to increase already with a low percentage of the excursion of the diaphragm 12.

[0017] Thus, in order to avoid the non-linearities of the diaphragm suspension 16, i.e. to provide a transmission characteristic between the excursion of the diaphragm 12 and the restoring force which is as linear as possible, the active elements 18 are provided to the (typically passive) suspension element 16. This active element 18 attached or integrated into the flexible element 16 is configured to influence positively and/or negatively the restoring force to the diaphragm 12 or, consequently, to actively influence the motion of the diaphragm 12. Therefore, the restoring force may be adjusted (i.e. reduced or increased) by overlaying it with an additional force generated by the active element 18.

[0018] The further force is controlled dependent on the excursion of the diaphragm 12 so that the non-linear range of the transmission characteristic may be corrected, i.e. that the further force overlaying the restoring force may be applied only when the excursion of the diaphragm 12 is above a threshold level, wherein no force may be applied when the excursion is below this threshold level. This threshold level indicating the border between the linear range and the non-linear range may be dependent on material properties of the flexible element 16, on the shape of the flexible element 16 and/or on further factors of influence like environmental conditions. The further factors of influence may comprise environmental conditions like temperature or the ambient pressure or the aging of the flexible elements 16 or of the diaphragm 12. In turn, this means that the active element 18 may optionally be configured to compensate the above factors of influence by adjusting the overlaying force generated by the active element 18.

[0019] Below, the controlling of the active element 18 will be discussed. According to further embodiments, the active devices 18 are controlled via an electrical control signal. This electrical control signal depends on the audio signal which controls the motion of the diaphragm 12 via the diaphragm drive system 14. Therefore, the control signal may be deduced from the audio signal, for example, by high-pass filtering same or by processing the audio signal by using a lookup table.

[0020] The control signal may alternatively or additionally be based on a sensor signal output by a sensor for determining non-linearities of the diaphragm 12 or for determining the transmission characteristic of the diaphragm suspension 16. The driver 10 comprises a sensor which is coupled to the diaphragm suspension or the diaphragm 12 for detecting the transmission characteristic. For example, the sensor may also be a piezoelectric device or may be formed by one of the active elements (piezoelectric devices) because such (piezoelectric) devices are typically configured to apply and to detect a force. Alternatively, the sensor may be a Hall Effect device which is configured to measure the magnetic field based on which non-linearities are detectable. Such sensors may comprise a processing unit configured to output the control signal for the active device 18 based on the sensor signal. Alternatively, the sensor described above may be implemented by a network comprising a plurality of sensors and a processing unit configured to process the different signals of the sensor and to output the control signal for the active devices 18.

[0021] Figs. 2a and 2b show a cross-sectional view of an implementation of the electroacoustic driver 10' which comprises the diaphragm 12 and the active (suspension) element 18' arranged between the basket 17 and the diaphragm 12. In more detail, the active element 18' is arranged all the way around the diaphragm edge region such that the diaphragm 12 is attached to the basket 16' via the active element 18'. The active suspension element 18' has the shape of a toroid configured for changing the height. The compressed toroid 18' is illustrated by Fig. 2a, wherein the expanded state is illustrated by Fig. 2b. This deformation of the active suspension element 18' is controllable via a control signal applied to : it.

[0022] The active suspension element 18' may have two connecting tabs 19 for electrically connecting them, e.g. via a processing unit.

[0023] In the embodiments shown in Figs. 2a and 2b, the diaphragm drive system 14 is formed by a permanent magnet 14a attached to the basket 17 and a voice coil 14b coupled to the diaphragm 12. Thus, the drive system acts as a plunger coil having just one motion direction so that in this embodiment the motion of the diaphragm 12 is limited to a piston-like motion. It should be noted that the voice coil 14b comprises two connecting tabs 15 for electrically connecting the drive system 14 such that the audio signal may be applied to it according to which the diaphragm 12 should be moved or should be caused to oscillate.

[0024] During the motion of the diaphragm 12 the air gap between the voice coil 14b and the permanent magnet 14a should remain constant or nearly constant. For insuring this, the active (suspension) element 18' is configured to guide the diaphragm 12 laterally and along the motion.

[0025] To prove this laterally guiding, the diaphragm suspension may have another component, as illustrated by Fig. 2c. Fig. 2c shows a driver 10' comprising a diaphragm 12 having a cone-shape and a basket 17 which may be connected to a loudspeaker housing 22. The drive system 14 is formed by the permanent magnet 14a and the coil 14b attached to the cone-shaped diaphragm 12. In this embodiment, the diaphragm suspension 16 is divided into an inner part and an outer part. The outer part is formed by a surround 16a arranged at the edge region of the diaphragm 12, wherein the inner part is formed by a spider 16b, arranged between the basket 17 and the diaphragm 12 next to a so-call dust cover 12'a of the cone-shaped diaphragm 12. It should be noted that the spider 16b may have a higher impact to the restoring force when compared to the impact caused by the surround 16a, which mainly has the purpose to seal the diaphragm 12' and the basket 17 or the loudspeaker house 22.

[0026] The surround 16a comprises the active elements 18 via which the restoring force may be adjusted. Here, the active elements 18 are integrated into the surround 16a. As discussed with respect to Figs. 2a and 2b the active elements 18 are electrically connectable via the connecting tabs 19 in order to control same.

[0027] Each of the embodiments discussed below is illustrated by two figures showing cross-sections of electroacoustic drivers, namely Fig. A and Fig. B, to illustrate the motion of the diaphragm 12. In each figure, the Fig. A illustrates the initial state while Fig. B illustrates the deflected state.

[0028] Figs. 3a and 3b show an electroacoustic driver 40 comprising the basket 17 and a diaphragm 12 configured to move in a direction of a piston-like motion. This motion is subjected by a diaphragm drive and suspension system 42, which is arranged between an edge region of the diaphragm 12 and the basket 17. The diaphragm drive and suspension system 42 may have the shape of a toroid (cf. Figs. 2a and 2b, active element 18') or may be integrated into the surround.

[0029] The diaphragm drive and suspension system 42 comprise a plurality of piezoelectric devices (actuators) for actively exciting the piston-like motion of the diaphragm 12. This motion and especially the expansion of the diaphragm drive and suspension system 42 is illustrated by Fig. 3b. For active exciting the motion of the diaphragm 12, the one or more active devices are configured to exert a (positive and/or negative) force to the diaphragm 12. This active exciting of the motion is controlled via an audio signal applied via the connecting tabs 19. Each toroid element or toroid brass of the diaphragm drive and suspension system 42 may change its bend radius and/or its length, if the audio signal, e.g. an AC voltage, is applied to same. The change of the length or of the bending radius may lead to a change of the shape of the diaphragm drive and suspension element 42, such that the diaphragm is moved in the direction of the piston-like motion.

[0030] Furthermore, the diaphragm drive and suspension system 42 have the purpose to guide the diaphragm 12 laterally and along the direction of the piston-like motion. By adapting the control signal applied via the connecting tabs 19 non-linearities of the diaphragm 12 caused by the suspension may be avoided or compensated, as discussed above.. The diaphragm drive and suspension system 42 may have the purpose to seal the diaphragm 12 relatively to the basket 17. Expressed in other words this means that the diaphragm drive and suspension system 42 integrates the diaphragm drive system and the diaphragm suspension system into one unit, for example into the surround.

[0031] Figs. 4a and 4b show a further implementation of an electroacoustic driver 40' which comprises a different implementation of the diaphragm drive and suspension system 42'. Here, the diaphragm drive and suspension system 42' is formed by a toroid brass which enables better suspension properties but a smaller excursion of the diaphragm 12 (cf. Fig. 4b). Although the diaphragm drive and suspension system 42 differs from the diaphragm drive and suspension system 42' regarding its shape, its functionality may be similar.

[0032] Figs. 5a and 5b show a further electroacoustical driver 50 as a related example not part of the appended claims comprising the diaphragm 12, a basket 52 and a diaphragm drive system 54 as well as a diaphragm suspension system 56. Here, the function of subjecting the diaphragm 12 to a piston-like motion and the function of guiding the diaphragm 12 laterally and along the piston-like motion are separated, wherein the diaphragm drive system 54 is substantially equal to the drive system shown in Fig. 3a, b and 4a, b. Thus, the diaphragm drive system 54 is arranged at an edge region of the diaphragm 12 and may comprise a toroid brass. The toroid brass arranged along the motion direction is configured change its length and/or its bend radius in order to subject the diaphragm 12 to a relative motion referring to the basket 52. For example, the drive system 54 or the toroid brass, respectively, may be formed by one or more electrical devices like piezoelectrical devices or by a bellow having a plurality of piezoelectrical devices integrated into it.

[0033] In this example, the diaphragm suspension system 56 is integrated into the basket 52 and implemented as a cylinder liner which laterally surrounds the diaphragm 12 in order to guide the diaphragm. According to further examples, the diaphragm suspension system 56 may comprise an element like a piston ring attached to the diaphragm 12 in order to reduce the friction between the cylinder liner 56 and the diaphragm 12.

[0034] Figs. 6a and 6b illustrate a further : related example not part of the appended claims of an electroacoustical device 50' which is substantially equal to the electroacoustical device 50 of Figs. 5a and 5b. The electroacoustical device 50' comprises a plurality of drive systems 54 arranged in series such that a drive system 54' is formed. I.e. that the plurality of drive elements 54 are arranged as a bellow extending along the motion of the diaphragm 12. This enlarged drive system 54' has an enlarged diaphragm stroke when compared to the example of Figs. 5a and 5b. Therefore, the suspension system 56' formed as a cylinder liner is enlarged as well.

[0035] Figs. 7a and 7b illustrate a further related example not forming part of the appended claims of an electroacoustic device 50" comprising the enlarged drive system 54' for moving the diaphragm 12. In this implementation 50" the suspension system 56" formed as a pneumatic cylinder is coupled to the diaphragm 12 in the middle of same. Therefore, the basket 52' does not necessarily comprise the cylinder liner 54 guiding the diaphragm 12.

[0036] Referring to Figs. 1 to 2, it should be noted that the active elements 18 having the purpose to compensate non-linearities may also be used for supporting the drive system. Thus, the active elements 18 may be configured to provide a force for subjecting the diaphragm 12 to a motion.

[0037] According to another embodiment, the active element 18 may be used for enlarging the stroke of the diaphragm 12. Here, a portion of the stroke is caused by the diaphragm drive system 14, wherein an additional portion of the stroke is caused by the active element 18. Regarding this embodiment it should be noted that the combination of the two drive systems for enlarging the stroke may cause additional nonlinearities.

[0038] The active element 18 may be used for defining the zero position of the diaphragm 12 which depends on the offset of the diaphragm drive system 14 and of the diaphragm suspension system 16. Background thereof is that the diaphragm suspension system 16 has a predetermined zero position (defined by the magnet), wherein the diaphragm suspension system 14 also has a predetermined zero position (defined by the stiffness of the suspension). Thus, if the zero positions of the two systems differ from each other it could be beneficial to adjust the offset of the whole system in order to operate the electroacoustic driver 10 within an optimized range. Thus, the active element 18 may be configured to cause a (static) deviation of the diaphragm 12 in order to offset same.

[0039] Although in above implementations some aspects of the electroacoustic device have been described in the context of a piston-like motion, it should be noted that the motion of the diaphragm may also be different, e.g. like a bending wave motion.

[0040] Although, the above embodiments of Figs. 1 and 2a-c show the active element 18 preferably arranged at an edge region of the diaphragm 12 or 12' (cf. surround 12a), it should be noted that the spider 16b and the surround 16a may comprise the active elements.

[0041] Also, in some embodiments the active element 18 is illustrated as an element influencing the restoring force. It should be noted that the active element may also influence a material parameter, e.g. the stiffness of a component of the diaphragm suspension or a damping factor of same. I.e. that the active element 18 may be configured to adapt the respective material parameter as a function of the excursion of the diaphragm 12.

[0042] Though in some embodiments the active element 18 has been described in context of a piezoelectrical device, it should be noted that the active element 18 may also be formed by a different (electrical) element or structure which may, for example, be based on electromagnetic or electrostatic principles.

[0043] Although in above embodiments the drive system 14 has been described as an electrical or electrodynamical drive system comprising a coil and a permanent magnet, it should be noted that also different drive systems may be used for the above described electroacoustical drivers. For example, the drive system may be an electrostatic drive system or a hydraulic drive system.


Claims

1. An electroacoustic driver (10), comprising:

a diaphragm;

a diaphragm drive system (14) configured to subject the diaphragm (12) to a motion; and

a diaphragm suspension (16) configured to guide the diaphragm;

wherein the diaphragm suspension (16) comprises an option taken from i) a spider (16b) and a surround (16a) or ii) the surround (16a); the surround (16a) comprising

one or more active elements (18) being integrated into the surround (16a) and

configured to actively influence the motion of the diaphragm (12) in accordance to a control signal by changing a restoring force in accordance to the control signal and/or by applying a force to the diaphragm (12) in accordance to the control signal,

wherein the electroacoustic driver (10) comprises a basket (17), wherein the surround (16a) is arranged between the basket (17) and the diaphragm (12) such that the surround (16a) guides and seals the diaphragm (12) against the basket (17);

wherein the one or more active elements (18) comprise electrical devices or piezo electrical devices;

characterized in that the electroacoustic driver (10) comprises a controller configured to output the control signal to the one or more active elements (18) of the diaphragm suspension (16) based on detected non-linearities and/or based on an audio signal via which the diaphragm drive system (14) is controlled; the electroacoustic driver (10) also comprising a sensor attached to the diaphragm (12) and/or to the diaphragm suspension (16) configured for detecting non-linearities in the piston-like motion of the diaphragm; and/or

wherein the sensor is formed by one of the active elements (18).


 
2. The electroacoustic driver (10) according to claim 1, wherein the one or more active elements (18) of the diaphragm suspension (16) are configured to adjust the restoring force counteracting an excursion of the diaphragm; and/or
wherein the spider is configured to guide the diaphragm (12) laterally and along a direction of the motion.
 
3. The electroacoustic driver (10) according to one of the claims 1 to 2, wherein the surround (16a) of the diaphragm suspension (16) is configured for laterally guiding the diaphragm (12) and/or for guiding the diaphragm (12) along a direction of the motion.
 
4. The electroacoustic driver (10) according to one of claims 1 to 3, wherein the one or more active elements (18) are configured to change an offset of the diaphragm.
 
5. The electroacoustic driver (10) according to one of claims 1 to 4, wherein the one or more active elements (18) are radially arranged along the surround (16a) in order to provide a constant returning force.
 
6. The electroacoustic driver (10) according to one of claims 1 to 5, wherein the one or more active elements are configured to to provide a force for subjecting the diaphragm (12) to a motion or to enlarge the stroke of the diaphragm (12).
 
7. The electroacoustic driver (10) according to one of the claims 1 to 6, wherein the diaphragm (12) is configured to act as a bending wave transducer.
 


Ansprüche

1. Ein elektroakustischer Treiber (10), der folgende Merkmale aufweist:

eine Membran;

ein Membranantriebssystem (14), das dazu konfiguriert ist, die Membran (12) einer Bewegung zu unterziehen; und

eine Membranaufhängung (16), die dazu konfiguriert ist, die Membran zu führen;

wobei die Membranaufhängung (16) eine Option aufweist, die entnommen ist aus: i) einer Spinne (16b) und einer Einfassung (16a) oder ii) der Einfassung (16a);

wobei die Einfassung (16a) eines oder mehrere aktive Elemente (18) aufweist, die in die Einfassung (16a) integriert sind und dazu konfiguriert sind, die Bewegung der Membran (12) gemäß einem Steuersignal aktiv zu beeinflussen, indem eine Rückstellkraft gemäß dem Steuersignal geändert wird und/oder indem eine Kraft auf die Membran (12) gemäß dem Steuersignal ausgeübt wird,

wobei der elektroakustische Treiber (10) einen Korb (17) aufweist, wobei die Einfassung (16a) zwischen dem Korb (17) und der Membran (12) derart angeordnet ist, dass die Einfassung (16a) die Membran (12) führt und gegen den Korb (17) abdichtet;

wobei das eine oder die mehreren aktiven Elemente (18) elektrische Vorrichtungen oder piezoelektrische Vorrichtungen aufweisen;

dadurch gekennzeichnet, dass

der elektroakustische Treiber (10) eine Steuerung aufweist, die dazu konfiguriert ist, das Steuersignal an das eine oder die mehreren aktiven Elemente (18) der Membranaufhängung (16) auf Basis von erfassten Nicht-Linearitäten und/oder auf Basis eines Audiosignals auszugeben, über das das Membranantriebssystem (14) gesteuert wird;

der elektroakustische Treiber (10) außerdem einen Sensor aufweist, der an der Membran (12) und/oder der Membranaufhängung (16) angebracht ist, der dazu konfiguriert ist, Nicht-Linearitäten in der kolbenähnlichen Bewegung der Membran zu erfassen; und/oder

wobei der Sensor durch eines der aktiven Elemente (18) gebildet ist.


 
2. Der elektroakustische Treiber (10) gemäß Anspruch 1, bei dem das eine oder die mehreren aktiven Elemente (18) der Membranaufhängung (16) dazu konfiguriert sind, die Rückstellkraft einzustellen, die einer Auslenkung der Membran entgegenwirkt; und/oder
wobei die Spinne dazu konfiguriert ist, die Membran (12) lateral und entlang einer Bewegungsrichtung zu führen.
 
3. Der elektroakustische Treiber (10) gemäß einem der Ansprüche 1 bis 2, bei dem die Einfassung (16a) der Membranaufhängung (16) dazu konfiguriert ist, die Membran (12) lateral zu führen und/oder die Membran (12) entlang einer Bewegungsrichtung zu führen.
 
4. Der elektroakustische Treiber (10) gemäß einem der Ansprüche 1 bis 3, bei dem das eine oder die mehreren aktiven Elemente (18) dazu konfiguriert sind, einen Versatz der Membran zu ändern.
 
5. Der elektroakustische Treiber (10) gemäß einem der Ansprüche 1 bis 4, bei dem das eine oder die mehreren aktiven Elemente (18) radial entlang der Einfassung (16a) angeordnet sind, um eine konstante Rückstellkraft bereitzustellen.
 
6. Der elektroakustische Treiber (10) gemäß einem der Ansprüche 1 bis 5, bei dem das eine oder die mehreren aktiven Elemente dazu konfiguriert sind, eine Kraft bereitzustellen, um die Membran (12) einer Bewegung zu unterziehen, oder dazu, den Hub der Membran (12) zu vergrößern.
 
7. Der elektroakustische Treiber (10) gemäß einem der Ansprüche 1 bis 6, bei dem die Membran (12) dazu konfiguriert ist, als Biegewellenwandler zu dienen.
 


Revendications

1. Dispositif d'entraînement électroacoustique (10), comprenant:

une membrane;

un système d'entraînement de membrane (14) configuré pour soumettre la membrane (12) à un mouvement; et

une suspension de membrane (16) configurée pour guider la membrane;

dans lequel la suspension de membrane (16) comprend une option prise parmi i) un croisillon (16b) et une pièce entourante (16a) ou ii) la pièce entourante (16a); la pièce entourante (16a) comprenant un ou plusieurs éléments actifs (18) qui sont intégrés dans la pièce entourante (16a) et configurés pour influencer de manière active le mouvement de la membrane (12) selon un signal de commande en modifiant une force de rappel selon le signal de commande et/ou en appliquant une force à la membrane (12) selon signal de commande,

dans lequel le dispositif d'entraînement électroacoustique (10) comprend un panier (17), dans lequel la pièce entourante (16a) est disposée entre le panier (17) et la membrane (12) de sorte que la pièce entourante (16a) guide et scelle la membrane (12) contre le panier (17);

dans lequel les un ou plusieurs éléments actifs (18) comprennent des dispositifs électriques ou des dispositifs piézoélectriques;

caractérisé par le fait que le dispositif d'entraînement électroacoustique (10) comprend un moyen de commande configuré pour sortir le signal de commande vers les un ou plusieurs éléments actifs (18) de la suspension de membrane (16) sur base des non-linéarités détectées et/ou sur base d'un signal audio par l'intermédiaire duquel est commandé le système d'entraînement de membrane (14);

le dispositif d'entraînement électroacoustique (10) comprenant égalernent un capteur, fixé à la membrane (12) et/ou à la suspension de membrane (16), configuré pour détecter les non-linéarités dans le mouvement de type piston de la membrane; et/ou

dans lequel le capteur est formé par l'un des éléments actifs (18).


 
2. Dispositif d'entraînement électroacoustique (10) selon la revendication 1, dans lequel les un ou plusieurs éléments actifs (18) de la suspension de membrane (16) sont configurés pour ajuster la force de rappel contrecarrant une excursion de la membrane; et/ou
dans lequel le croisillon est configuré pour guider la membrane (12) latéralement et dans une direction du mouvement.
 
3. Dispositif d'entraînement électroacoustique (10) selon l'une des revendications 1 à 2, dans lequel la pièce entourante (16a) de la suspension de membrane (16) est configurée pour guider latéralement la membrane (12) et/ou pour guider la membrane (12) dans une direction du mouvement.
 
4. Dispositif d'entraînement électroacoustique (10) selon l'une des revendications 1 à 3, dans lequel les un ou plusieurs éléments actifs (18) sont configurés pour modifier un décalage de la membrane.
 
5. Dispositif d'entraînement électroacoustique (10) selon l'une des revendications 1 à 4, dans lequel les un ou plusieurs éléments actifs (18) sont disposés radialement le long de la pièce entourante (16a) pour fournir une force de rappel constante.
 
6. Dispositif d'entraînement électroacoustique (10) selon l'une des revendications 1 à 5, dans lequel les un ou plusieurs éléments actifs sont configurés pour fournir une force pour soumettre la membrane (12) à un mouvement ou pour agrandir la course de la membrane (12).
 
7. Dispositif d'entraînement électroacoustique (10) selon l'une des revendications 1 à 6, dans lequel la membrane (12) est configurée pour agir comme transducteur d'onde de flexion.
 




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Cited references

REFERENCES CITED IN THE DESCRIPTION



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Patent documents cited in the description