WO2008003583A1 - Transducteur électro-acoustique miniature doté d'une bobine de couplage intégrée - Google Patents

Transducteur électro-acoustique miniature doté d'une bobine de couplage intégrée Download PDF

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Publication number
WO2008003583A1
WO2008003583A1 PCT/EP2007/056065 EP2007056065W WO2008003583A1 WO 2008003583 A1 WO2008003583 A1 WO 2008003583A1 EP 2007056065 W EP2007056065 W EP 2007056065W WO 2008003583 A1 WO2008003583 A1 WO 2008003583A1
Authority
WO
WIPO (PCT)
Prior art keywords
acoustic transducer
coil
miniature electro
transducer according
electro
Prior art date
Application number
PCT/EP2007/056065
Other languages
English (en)
Inventor
Morten Kjeldsen Andersen
Kurt Sørensen
Original Assignee
Sonion Horsens A/S
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sonion Horsens A/S filed Critical Sonion Horsens A/S
Priority to EP07730244A priority Critical patent/EP2041995A1/fr
Publication of WO2008003583A1 publication Critical patent/WO2008003583A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/24—Inductive coupling
    • H04B5/26—Inductive coupling using coils
    • H04B5/266—One coil at each side, e.g. with primary and secondary coils
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/55—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired
    • H04R25/554—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired using a wireless connection, e.g. between microphone and amplifier or using Tcoils
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers

Definitions

  • the present invention relates to a miniature electro-acoustic transducer comprising an integrated coupling coil for electro-magnetic coupling to a T-coil of an associated hearing aid.
  • the present invention relates to a miniature electro-acoustic transducer where the coupling coil is a separate electro-magnetic device that does not form an integral part of any voice coil.
  • US 2005/0244022 discloses a removable bezel for use with for example a cellular phone to enhance operation with a hearing aid.
  • the removable bezel has an integrated electromagnetic coil that is coupled to an audio output device of the cellular phone.
  • the electromagnetic coil is either inductively coupled to an acoustic transducer within the cellular phone or coupled thereto directly by direct electrical connections.
  • the electro-magnetic coil suggested in US 2005/0244022 constitutes an integrated part of a removable bezel and provides an enhanced magnetic field to a T-coil magnetic pick up within most conventional hearing aids.
  • WO 03/063545 discloses a displaceable diaphragm for a miniature electro-acoustic transducer.
  • the diaphragm comprises a flexible sheet having first and second sheet sections.
  • Each sheet section has one or more electrically conductive paths, forming one or more coils, integrated therewith.
  • Each of the coils has an active part which is positioned in a magnetic field so that forces acting on the active part, in response to currents passing through the active part, are transformed to displacements of the diaphragm.
  • the coils of WO 03/063545 are all optimised for causing maximum displacements of the diaphragm in response to currents passed through the coils.
  • the present invention relates, in a first aspect, to a miniature electro-acoustic transducer assembly comprising a magnet circuit, a first coil, and a second coil.
  • the magnetic circuit may comprise a permanent magnet assembly arranged to generate a magnetic flux in an air gap.
  • the first coil may be positioned at least partly in the air gap.
  • the first coil may be regarded as a moving voice coil operatively connected to a displaceable diaphragm.
  • the second coil may be regarded as a coupling coil formed by an electrically conducting path.
  • the second coil (coupling coil) may be adapted to couple to a T-coil of an associated hearing aid by generating, in relation to the miniature electro-acoustic transducer, an external electro- magnetic field having a spatial extension overlapping the coil of the associated hearing aid.
  • the diaphragm displacements may be essentially unaffected by current flowing in the electrically conducting path forming the second coil.
  • the term "essentially unaffected" means that current flowing in the second coil does not introduce diaphragm displacements that are sufficient to generate detectable air pressure variations. Thus, electrical current flowing in the second coil does not contribute to diaphragm displacements.
  • the first coil may be optimised to produce maximum diaphragm displacements in response to current passed through it. This may be achieved by positioning the first coil in the air gap where it is exposed to a magnetic flux generated across the air gap. Thus, by ensuring maximum spatial overlap between the magnetic flux and the first coil, effective diaphragm displacements may be obtained when a drive current is passed through the first coil.
  • the second coil may be positioned outside the air gap and is therefore not exposed to the magnetic flux generated in the air gap.
  • the second coil is positioned outside the air gap and, consequently, is not exposed to the magnetic flux, current passing through the second coil does not introduce diaphragm displacements.
  • the second coil is adapted to generate an externally detectable electro-magnetic field that may be picked-up by a T-coil of an associated hearing aid.
  • the first and second coils of the miniature electro-acoustic transducer may be connected in series.
  • the series connection may be established by first passing a drive current through the first coil and then passing the same driving current through the second coil.
  • the drive current may be passed through the first and second coils in the opposite order.
  • the drive current may firstly be passed through a first part of the second coil, then the first coil and finally through a second part of the second coil.
  • the series-connected first and second coils may have a total electrical impedance within the range 20 to 50 ohms, such as within the range 30 to 40 ohms, such as approximately 35 ohms.
  • the impedance of the first coil may be approximately 32 ohms whereas the impedance of the second coil may be approximately 3 ohms.
  • the impedance of the first coil may be approximately ten times larger than the impedance of the second coil.
  • the first and second coils may be connected in parallel.
  • the impedance of the second coil may be approximately ten times larger than the impedance of the first coil.
  • the first coil in a parallel configuration of the first and second coils the first coil may have an impedance of approximately 32 ohms whereas the impedance of the second coil may be approximately 320 ohms or even higher.
  • the diaphragm may comprise a flex- print portion having the second coil arranged on an upper surface portion thereof whereas the first coil may be operatively connected to a lower surface portion of the flex-print portion.
  • the lower surface portion may be substantially parallel with the upper surface portion.
  • the second coil may be arranged on a foldable carrier comprising first and second coil portions arranged on respective first and second portions of the foldable carrier.
  • the foldable carrier is arranged on an exterior surface portion of the transducer.
  • the foldable carrier may comprise a foldable flex-print having the first and second coil portions arranged on respective first and second flex-print portions.
  • the foldable flex-print is, in a folded state, arranged on an exterior surface portion of a cover of the electro-acoustic transducer.
  • the first and second flex-print portions may be separated by a folding line along which the foldable flex-print is adapted to be folded so that the first and second coil portions may be arranged on opposing flex-print portions when the foldable flex-print is in a folded state.
  • Each of the first and second flex-print portions may comprise one or more sound openings.
  • the one or more sound openings are adapted to be aligned with one or more sound outlets in the cover of the electro-acoustic transducer.
  • the dimensions of the one or more sound openings in the flex-print portions may be dimensioned to match the corresponding dimensions of the one or more sound outlets in the cover.
  • the shape of the one or more sound openings in the flex-print portions may in principle be arbitrary, such as circular, elliptical, rectangular, and quadratic or a combination thereof.
  • the sound outlets in the cover may be arranged as a through-hole or opening, or optionally, as multiple through- holes or openings with an acoustical damper having specific acoustical properties arranged therein.
  • the second coil may be arranged in an indentation or groove formed in a cover covering the diaphragm of the electro-acoustic transducer.
  • the indentation or groove formed in the cover covering the diaphragm may extend primarily along the circumference of the cover.
  • the indentation or groove formed in the cover may be formed in combination with an exterior housing portion edge of the transducer.
  • the orientation of the exterior housing portion edge and coil supporting portion of the cover may be arranged substantially perpendicular to each other.
  • the exterior housing portion edge, the coil supporting portion of the cover, and a bridging portion of the cover encapsulates three surfaces of the second coil, which effectively protects the second coil against for example accidental drops.
  • the second coil may be arranged as an integral part of a thermoformed cover covering the diaphragm of the electro-acoustic transducer.
  • the thermoformed cover may comprise a flex-print having an average thickness within the range 100-500 ⁇ m, such as within the range 200-300 ⁇ m.
  • the second coil may comprise electrically connected outer and inner portions, such as an outer and an inner half, wherein the outer portion of the second coil may be arranged on an exterior surface portion of the thermoformed cover.
  • the inner portion of the second coil may be arranged on an interior surface portion of the thermoformed cover.
  • the miniature electro-acoustic transducer according to the present invention may further comprise a magnetically permeable outer housing portion forming part of the magnet circuit in that at least part of the magnetically permeable outer housing portion may form an outer pole piece of the magnet circuit.
  • the magnetically permeable outer housing portion may comprise an essentially circular through-going opening, wherein an inner surface or edge of said through-hole or opening defines the air gap.
  • an inner surface or edge of said through-hole or opening defines the air gap.
  • the inner boundary of the air gap may be defined by an inner pole piece, or alternatively, by a bobbin, as discussed below.
  • the magnet circuit may comprise an annular permanent magnet having a first surface attached to the magnetically permeable outer housing portion.
  • the magnet circuit may further comprise a magnetically permeable yoke attached to a second surface of the annular permanent magnet. The second surface may be substantially parallel to the first surface.
  • the magnetically permeable yoke may comprise a magnetically permeable bobbin substantially concentrically arranged with the annular magnet.
  • the magnet circuit may comprise a centre magnet substantially concentrically arranged with the annular magnet.
  • the centre magnet may be arranged with a first surface attached to the magnetically permeable yoke.
  • the magnet circuit may further comprise a magnetically permeable centre pole piece substantially concentrically arranged with the annular magnet.
  • the centre pole piece may be attached to a second surface of the centre magnet.
  • the second surface of the centre magnet may be substantially parallel to the first surface of the centre magnet.
  • One or more air flow passages may be provided in the magnetically permeable outer housing portion.
  • the one or more air flow passages allow air trapped below the diaphragm to escape to the exterior of the transducer.
  • a first and a second contact arrangement for providing a first electrical connection and a second electrical connection from the exterior of the transducer to the interior of the transducer may be included.
  • Each of the first and second contact arrangements may comprise an electrically conducting resilient member and a U- shaped clamp.
  • the electrically conducting resilient member of each contact arrangement may comprise a spring element comprising a helically-shaped spring member.
  • Each of the U- shaped clamps may form an exterior contact pad arranged to receive a spring element.
  • each of the U-shaped clamps may form an interior contact pad arranged to receive a wire end from the first coil.
  • Each of the U-shaped clamps may comprise a flex-print, which is folded along a folding line.
  • Each of the U-shaped clamps therefore comprises an inner and an outer flex-print portion, which are essentially parallel to each other.
  • the present invention relates to a portable communication unit comprising a miniature electro-acoustic transducer according to the first aspect of the present invention.
  • the portable communication unit may be selected from the group consisting of: cellular phones, PDAs, game consoles and portable computers.
  • Fig.1 shows a coupling coil arranged on a foldable flex-print.
  • Fig.2 shows the flex-print of Fig. 1 in a folded state.
  • Figs.3a and 3b show a miniature electro-acoustic transducer having a folded flex-print arranged thereon.
  • Figs.4a and 4b show a miniature electro-acoustic transducer having a coupling coil arranged along the circumference of a transducer cover.
  • Figs.5a and 5b show top and bottom views of a flex-print diaphragm having a coupling coil integrated therewith.
  • Figs.6a and 6b show top and bottom views of a cover for a miniature electro-acoustic transducer, the cover having an integrated coupling coil.
  • the present invention relates to a miniature electro-acoustic transducer having a coupling coil integrated wherewith.
  • the term "coupling coil” is to be understood herein as a separate component capable of generating an, in relation to the miniature electro-acoustic transducer, electro-magnetic field which can be picked up by a T- coil of an associated hearing aid.
  • the coupling coil is a separate electro-magnetic device that does not form an integral part of any voice coil.
  • Fig. 1 shows a first embodiment of the present invention.
  • a carrier 1 in the form of a foldable flex-print has electrically conductive paths 2, 3 arranged thereon.
  • Each of the electrically conductive paths 2, 3 of Fig. 1 constitutes a half coil and they may be fabricated by any suitable material, such as copper.
  • the electrically conducting paths 2, 3 may be manufactured using conventional techniques applied to process conventional PCBs.
  • the pitch of the electrically conducting paths is approximately 0.4 mm in that the width of the electrically conducting paths is approximately 0.2 mm. Similarly, the distance between the electrically conducting paths is 0.2 mm.
  • the foldable flex-print is adapted to be folded along the dashed line so that the electrically conducting paths 2, 3 are located on opposing inner surface portions of the folded flex-print 1.
  • the electrically conductive paths 2, 3 are arranged to be connected in series when the flex-print 1 is in its folded state, as shown in Fig.2. This series connection is established by connecting contact pad 4 to contact pad 5, and connecting contact pad 6 to contact pad 7.
  • the resulting electrically conducting path, now forming the complete coupling coil, is electrically accessible via contact terminals 8 and 9.
  • the foldable flex- print 1 comprises a plurality of sound openings 10, 11, 12, 13.
  • opening 10 is arranged to be aligned with opening 12, and opening 11 is arranged to be aligned with opening 13 as depicted in Fig.2.
  • a folded flex-print has been positioned on a cover 14 of a miniature electromagnetic transducer 15.
  • the folded flex-print is positioned on the cover 14 in such a way that sound openings 10, 11, 12, 13 are aligned with corresponding sound outlets in the cover 14 of the miniature electro- magnetic transducer 15 to allow audible signals generated by the miniature electro- magnetic transducer 15 to propagate freely to the surroundings.
  • the contact terminals 8, 9 are connected in series with the contact terminals 16, 17 of a voice coil (see Fig.4b) positioned within the m iniature electro- magnetic transducer 15.
  • the voice coil which is positioned in an air gap of a magnet circuit, is operatively connected to a displaceable diaphragm.
  • a force acts on the diaphragm. This applied force causes the diaphragm to be displaced from its rest position in accordance with the electrical current passed through the voice coil. In this way, audible signals may be generated.
  • the voice coil and coupling coil are driven simultaneously, they are, preferably, driven in phase.
  • the reason for this is that in case the coils are driven out of phase (for example, 180 degrees out of phase), the electro-magnetic fields generated by the two coils counteract each other. Such counteracting behaviour will lead to a reduced coupling efficiency with a T-coil of an associated hearing aid.
  • the voice coil and the coupling coil must, preferably, be driven in phase, or alternatively, the coupling coil must be driven separately, i.e. without being operatively connected to the voice coil.
  • the impedance of the voice coil itself is around 32 ohms whereas the impedance of the coil formed by the electrical path on the flex-print is significantly smaller, typically around 3 ohms.
  • the impedance of the voice coil is approximately ten times larger that the impedance of the coil formed by the electrical path on the flex-print.
  • FIG.4a shows a m iniature electro- magnetic transducer 15 having a coupling coil 21 arranged near the circumference of the cover 14.
  • the cover 14 has sound outlets 20 in the form of through- holes or openings arranged therein.
  • the coupling coil 21 is implemented as a wounded wire, such as an enamelled copper wire, dimensioned to fit into the groove formed by the cover 14 and a magnetically permeable outer housing portion 19.
  • the coupling coil 21 shown in Fig.4a and 4b has an essentially rectangular cross-sectional profile, but other cross-sectional profiles, such as essentially circular, elliptical etc. may also be applicable.
  • Fig.4b shows a cross-sectional profile of a miniature electro-acoustic transducer comprising a coupling coil according to the second embodiment. Also, Fig.4b shows an example of how the magnet circuit can be implemented.
  • the magnet circuit of Fig.4b is constituted by an annular magnet 22, a centre magnet 23, a centre pole piece 24 and magnetically permeable yoke 25.
  • the annular magnet and the centre magnet are permanent magnets.
  • Part of the magnetically permeable outer housing portion 19 forms an outer pole piece which, in combination with the centre pole piece 24, defines an air gap adapted to receive a voice coil 26.
  • the voice coil 26 is operatively connected to a displaceable diaphragm 27. When a time varying electrical drive signal is passed through the voice coil 26 the diaphragm 27 is displaced accordingly.
  • the centre magnet and/or the annular magnet may comprise NdFeB compounds having a remanence flux density of at least 1.2 T, a coercive force of at least 1000 kA/m and an energy product of at least 300 kJ/m 3 .
  • an NdFeB N44H may be applied.
  • the air gap may have awidth in the range 0.5 - 0.8 mm, such as around 0.6 mm.
  • the average magnetic flux density in the air gap may be in the range 0.3 - 1.5 T, such as in the range 0.5 - 1 T.
  • the voice coil is made of a wound copper wire or a wound Copper-Clad Alum inium (CCA) wire. I n the case of a CCA wire, the copper content may be around 15%.
  • Suitable pole piece materials are low carbon content steel materials, such as materials similar to Werkstoff-No. 1.0330 (St 2), 1.0333 (St 3), 1.0338 (St 4), all in accordance to DIN EN 10130.
  • the magnetically permeable outer housing portion may also be manufactured in one of these materials.
  • the types of polymer films may be polyarylate (PAR), polyetherimide (PEI), polyrtheretherketone (PEEK), polyphenylene sulphide (PPS), polyethylenenapthalate (PEN), terephtalate (PET) or polycarbonate (PC).
  • PAR polyarylate
  • PEI polyetherimide
  • PEEK polyrtheretherketone
  • PPS polyphenylene sulphide
  • PEN polyethylenenapthalate
  • PET terephtalate
  • PC polycarbonate
  • a flex-print based diaphragm can be used as a carrier for a coupling coil as set forth in Figs.5a and 5b.
  • the coupling coil portions 28 according to this third embodiment is arranged on a substantially plane and stiff flex-print portion 29 which is attached to a flexible surround 30.
  • the flex-print portion 29 can be attached to the surround 30 by means such as for example gluing, heating or ultrasound- based welding.
  • the edge 31 along the circumference of the surround 30 is adapted to be attached to the housing of the miniature electro-acoustic transducer or to the magnet circuit of the miniature electro-acoustic transducer.
  • Electrical wires 32, 33 are integrated in the surround 30 so that a drive signal from an associated drive circuit can be provided to the coupling coil portions 28 provided on the flex-print 29 via contact pads 34, 35, which are electrically connected to contact pads 36, 37, respectively.
  • End contact pads 38, 39 are electrically connected to respective ones of contact pads 40, 41 which are interconnected to form an electrical path between the wires 32, 33.
  • the contact pads 40, 41 can be connected to wire ends of a voice coil whereby a series connection of the coupling coil portions 28 is established.
  • the surround can be a moulded surround which is made of a soft material, such as silicone, rubber or a similar soft material.
  • the surround material can be chosen independently of the flex-print material. It should be mentioned that the flex-print material can be replaced by another material, such as Kapton® (polyimide), aluminium, nylon, etc.
  • the impedance of an associated voice coil is around 32 ohms, whereas the impedance of the coupling coil formed by the electrical path on the flex-print portion 29 is significantly smaller, typically around 3 ohms.
  • the series connection of the voice coil and the coupling coil is slightly exceeding 32 ohms.
  • Fig. 6 shows top and bottom views of another embodiment of the present invention.
  • Fig. 6a shows a top view of a cover 42 for a miniature electro-acoustic transducer.
  • the cover is made of a relatively stiff material, such as a 200-300 ⁇ m thick thermoformed flex-print.
  • the coupling coil 43 can be integrated with the cover.
  • half of the coupling coil 43 is arranged on the top side of the cover whereas, as seen in Fig. 6b, the other half of the coupling coil is arranged on the bottom side of the cover.
  • the two halves are electrically connected via centre point 44 whereby an electrical connection is established between coil ends 45, 46.
  • the cover 42 is also equipped with sound outlet openings 47 so that sound generated by the transducer is allowed to escape to the surroundings.
  • the coupling coil can be coupled in series or in parallel with a voice coil of miniature electro-acoustic transducer.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Neurosurgery (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

La présente invention concerne un ensemble transducteur électro-acoustique miniature comprenant un circuit magnétique comportant un ensemble aimant permanent conçu pour générer un flux magnétique dans un entrefer, une bobine acoustique qui est positionnée au moins partiellement dans l'entrefer et opérationnellement connectée à un diaphragme mobile, et une bobine de couplage constituée par une piste électroconductrice et destinée à être couplée à une bobine T (T-coil) d'un appareil auditif associé et à générer, en relation avec le transducteur électro-acoustique miniature, un champ magnétique électro-acoustique externe dont l'extension spatiale recouvre la bobine de l'appareil auditif associé, les déplacements du diaphragme étant essentiellement non affectés par le courant circulant dans la piste électroconductrice formant la bobine de couplage.
PCT/EP2007/056065 2006-07-07 2007-06-19 Transducteur électro-acoustique miniature doté d'une bobine de couplage intégrée WO2008003583A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07730244A EP2041995A1 (fr) 2006-07-07 2007-06-19 Transducteur électro-acoustique miniature doté d'une bobine de couplage intégrée

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US81917406P 2006-07-07 2006-07-07
US60/819,174 2006-07-07

Publications (1)

Publication Number Publication Date
WO2008003583A1 true WO2008003583A1 (fr) 2008-01-10

Family

ID=38608109

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/056065 WO2008003583A1 (fr) 2006-07-07 2007-06-19 Transducteur électro-acoustique miniature doté d'une bobine de couplage intégrée

Country Status (4)

Country Link
EP (1) EP2041995A1 (fr)
KR (1) KR20090027749A (fr)
CN (1) CN101491112A (fr)
WO (1) WO2008003583A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120163644A1 (en) * 2010-12-26 2012-06-28 Chao Xu Speaker and method for fabricating same
CN105340297A (zh) * 2013-06-25 2016-02-17 楼氏国际采购中心（马来西亚）私人有限公司 助听器兼容的移动扬声器
EP2929617A4 (fr) * 2012-12-10 2016-07-20 Intel Corp Bobines en cascade de couverture multi-surface de communication en champ proche

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8682014B2 (en) * 2012-04-11 2014-03-25 Apple Inc. Audio device with a voice coil channel and a separately amplified telecoil channel
CN113490119B (zh) * 2021-05-20 2023-02-21 汉得利（常州）电子股份有限公司 一种音膜组、贴合治具、制作方法及发声器件

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0565181A1 (fr) * 1992-04-09 1993-10-13 Koninklijke Philips Electronics N.V. Récepteur électrodynamique pour combiné téléphonique
US5740257A (en) * 1996-12-19 1998-04-14 Lucent Technologies Inc. Active noise control earpiece being compatible with magnetic coupled hearing aids
US20050244022A1 (en) * 2004-04-28 2005-11-03 Motorola, Inc. Hearing aid compatible device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0565181A1 (fr) * 1992-04-09 1993-10-13 Koninklijke Philips Electronics N.V. Récepteur électrodynamique pour combiné téléphonique
US5740257A (en) * 1996-12-19 1998-04-14 Lucent Technologies Inc. Active noise control earpiece being compatible with magnetic coupled hearing aids
US20050244022A1 (en) * 2004-04-28 2005-11-03 Motorola, Inc. Hearing aid compatible device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120163644A1 (en) * 2010-12-26 2012-06-28 Chao Xu Speaker and method for fabricating same
US8705788B2 (en) * 2010-12-26 2014-04-22 Aac Acoustic Technologies (Shenzhen) Co., Ltd. Speaker and method for fabricating same
EP2929617A4 (fr) * 2012-12-10 2016-07-20 Intel Corp Bobines en cascade de couverture multi-surface de communication en champ proche
CN105340297A (zh) * 2013-06-25 2016-02-17 楼氏国际采购中心（马来西亚）私人有限公司 助听器兼容的移动扬声器

Also Published As

Publication number Publication date
KR20090027749A (ko) 2009-03-17
EP2041995A1 (fr) 2009-04-01
CN101491112A (zh) 2009-07-22

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