WO1998025438A1 - Acoustic isolation of vibration transducer - Google Patents

Acoustic isolation of vibration transducer Download PDF

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Publication number
WO1998025438A1
WO1998025438A1 PCT/GB1997/003337 GB9703337W WO9825438A1 WO 1998025438 A1 WO1998025438 A1 WO 1998025438A1 GB 9703337 W GB9703337 W GB 9703337W WO 9825438 A1 WO9825438 A1 WO 9825438A1
Authority
WO
WIPO (PCT)
Prior art keywords
gel
gasket
speaker
assembly according
transducer
Prior art date
Application number
PCT/GB1997/003337
Other languages
French (fr)
Inventor
Tommy Salomonson
Stéphane KLEIN
Original Assignee
Raychem Limited
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 Raychem Limited filed Critical Raychem Limited
Priority to AU52323/98A priority Critical patent/AU5232398A/en
Publication of WO1998025438A1 publication Critical patent/WO1998025438A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2892—Mountings or supports for transducers
    • H04R1/2896—Mountings or supports for transducers for loudspeaker transducers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/225—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for telephonic receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's

Definitions

  • This invention relates to acoustic isolation of a vibration-producing transducer, by which is meant at least partial reduction in unwanted transmission of vibrations from the transducer to an adjacent body.
  • the transducer will usually (but not necessarily always) be an electrical device for receiving electrical signals and converting them into audible sound vibrations, for example a speaker such as a loudspeaker or an ear-piece for telecommunications or audio equipment.
  • the invention is especially useful with transducers which are mounted in contact with or attached to an adjacent (eg. supporting) body, for example a relatively large loudspeaker mounted in or on the housing of audio recording or reproduction equipment, or a relatively small speaker for use close to or in the listener's ear, as in mobile telecommunications equipment or audio headphones.
  • the invention accordingly provides an assembly comprising a vibration-producing transducer mounted adjacent to a vibration-transmitting body and a vibration-absorbing gel gasket in contact with (preferably between) the transducer and the said body.
  • gels especially the preferred gels hereinafter described, tend to provide superior acoustic isolation performance compared with known resilient materials previously used for that purpose.
  • the gel gasket may, for example, be arranged to reduce radiation from the housing of a speaker of sounds which are intended to be private, for example in headphones or mobile telephones; or uie gel gasket may be arranged to reduce unwanted resonance and interference between loudspeakers and their housing or adjacent loudspeakers, which might otherwise impair the fidelity of loudspeaker performance.
  • references to the vibration-transmitting body, adjacent to which the transducer is mounted include bodies which are capable of transmitting vibrations to or from the transducer, even when not actually transmitting diem.
  • the gasket is preferably positioned between the transducer and such a body, to which body the transducer is preferably attached by any suitable mounting means, for example screws, which are preferably loosely or flexibly connected, more preferably connected by means of vibration-absorbing material (eg. gel), to the transducer and/or to the body.
  • me gasket is in the form of a ring and is in contact widi a peripheral region of the transducer surrounding a more central operationally-active region thereof.
  • the operationally active region might, for example, be an apertured area of the microphone or speaker housing through which the desired vibrations are intended to pass in operation.
  • Gel materials have been found especially suitable for the acoustic isolation purposes of the present invention, at least partly owing to their unique combination of cohesive strength with high elongation and flexibility.
  • the gel of the gasket has substantially elastic deformation up to an elongation of at least 100%, ultimate tensile strength (ASTM D412) up to 2 MPa (preferably less than 1.5 MPa, more preferably less than 1 MPa), dynamic storage modulus at 0.1 Hz less than 50 kPa, and substantially zero slump at temperatures up to 100°C, preferably up to 120°C.
  • the gel of the gasket comprises a (hard-block)-(elastomeric block)-(hard block) triblock copolymer with the elastomeric block extended by at least 200 parts, preferably at least 300 parts, or possibly at least 400 parts, by weight of extender fluid per 100 parts by weight of d e block copolymer.
  • die said copolymer is a (hard-block)- (hydrogenated-polyalkylene block)-(hard block) triblock copolymer, preferably a styrene- (ethylene/propylene and/or ethylene/butylene)-styrene triblock copolymer.
  • Preferred triblock gels include those known from WO-A-9305113 (RK451), WO-A- 9323472 (RK469), or WO-A-9418273 (RK472), or from the aforementioned EP-A- 0426658 which describes addition of polyphenylene oxide to raise the softening temperature of styrene-alkylene-styrene triblock copolymer gels.
  • EP-A- 0426658 which describes addition of polyphenylene oxide to raise the softening temperature of styrene-alkylene-styrene triblock copolymer gels.
  • Especially preferred gels for the present purposes are those described in US-A- 4716183 (MP1102), die disclosure of which is incorporated herein by reference, comprising a blend of two different styrene-ethylene/butylene-styrene triblock copolymers, which gels have the further advantage of being flow-mouldable.
  • the gel of the gasket comprises 20 to 30%, preferably 22 to 27%, more preferably 23 to 25%, by weight (of the whole gel composition) of the styrene-(ethylene/propylene and/or ethylene/butylene)-styrene triblock copolymer, and 80 to 70%, preferably 78 to 73%, more preferably 77 to 75%, by weight (of the whole gel composition) of the extender fluid, possibly including known minor additives such as antioxidants, or pigments.
  • me gasket comprises a 0.6 mm thick layer of gel comprising 24% by weight of Septon 2006 (Trade Mark) styrene-ethylene/propylene-styrene triblock copolymer extended with FINA A360B (Trade Mark) oil and containing 2% by weight of known antioxidant, as generally described in me aforementioned WO-A-9323472 and other references.
  • the gel gasket is not more than 2 mm, preferably not more than 1 mm, in thickness. It may also be acceptable, and desirable for cost control, that the gasket comprises the gel alone, in me absence of any gel support or gel carrier embedded in, or adhered to the surface of, the gel. However, thicker gaskets and/or gaskets comprising gel having carrier films or filaments embedded in it may be used if desired, for example on larger or heavier transducers such as loud speakers. Gaskets having films or filaments adhered to the outer gel surface may also be useful, although it may in some cases be undesirable thus to reduce or eliminate direct contact of the gel with the transducer and/or me adjacent body.
  • the gel gaskets may be formed by any convenient memod, for example by moulding, e.g. flow-moulding, or by simple die-cutting from a sheet of gel material, for example an extruded sheet profile as described in our WO-A-9709391 (RK532), or by cutting a ring gasket from a tubular profile carrier externally coated with gel, as described in our WO-A-9609483 (RK508).
  • the shape of me gasket will be selected to suit the transducer assembly in question, round or rectangular gaskets often being convenient in practice.
  • the invention includes the use of a gel for at least partial acoustic isolation of a vibration-producing transducer from a vibration-transmitting body, me gasket (preferably the gel itself) being in contact with both the transducer and the said body.
  • a preferred form of gel gasket for the acoustic isolation of a vibration transducer from an adjacent vibration-transmitting body comprises a double-coated sheet having a polymeric film backing carrying the gel on both of its main surfaces.
  • the backing sandwiched between the two layers of gel, which may be the same or different, enhances the handling, gasket cutting, and gasket positioning characteristics when used for the purposes hereinbefore described.
  • This double-coated gel sheet may be made of any gel and film materials which suit me requirements of the end use, but is preferably constituted as described and claimed in our WO-A-9709391 (RK532), the disclosures of which are incorporated herein by reference.
  • one surface of me double-coated gel sheet or gasket will be powdered with talc or other tack-reducing powder to further enhance ease of handling. It is an advantage of gels mat they are apparently able to engulf such tack-reducing particles and so achieve desirable surface contact or adhesion when pressed against a surface in use, for example when compressed between the aforesaid transducer and adjacent vibration-transmitting surface.
  • Figure 1 shows schematically an interior view of a portable telephone handset showing the ear-piece speaker mounting
  • Figure 2 shows in partial cross-section a side view of the handset of Figure 1.
  • Figure 1 shows an open half body shell B of a portable telephone (with mating half shell B in Figure 2) with an ear-piece speaker S mounted inside the half body shell B having a gel ring gasket G between the body shell and die speaker.
  • the gasket G has an aperture A aligned between the active output portion of the speaker S and holes H in the body shell to allow the sound from the speaker to come freely out of the body shell to d e ear of the telephone user, while minimising radiation of me sound in other directions by reducing acoustic coupling dirough the body shell.
  • the fastening screws F fit loosely through holes in the speaker body, which may have resilient (preferably gel) grommets or linings, to minimise acoustic coupling of the speaker with the body shell dirough the fastenings.
  • Reduced acoustic coupling of speakers to body shells or housings and/or to adjacent speakers can be achieved on a larger scale, for example in loudspeaker cabinets for high-fidelity listening, or in facsimile transmission (“fax”) machines, using suitably larger and/or diicker gel gaskets as required.

Abstract

An assembly comprising a vibration-producing transducer such as a loudspeaker mounted adjacent to a vibration-transmitting body such as the speaker housing, and a vibration-absorbing gel gasket in contact with (preferably between) the transducer and said body. Gels, especially the preferred triblock copolymer gels having natural resonance frequencies below the audible range, are arranged to reduce radiation from the housing of a speaker of sounds which are intended to be private, for example in headphones or mobile telephones; or to reduce unwanted resonance and interference between loudspeakers and their housing or adjacent loudspeakers, which might otherwise impair the fidelity of loudspeaker performance.

Description

ACOUSTIC ISOLATION OF VIBRATION TRANSDUCER
This invention relates to acoustic isolation of a vibration-producing transducer, by which is meant at least partial reduction in unwanted transmission of vibrations from the transducer to an adjacent body. The transducer will usually (but not necessarily always) be an electrical device for receiving electrical signals and converting them into audible sound vibrations, for example a speaker such as a loudspeaker or an ear-piece for telecommunications or audio equipment. The invention is especially useful with transducers which are mounted in contact with or attached to an adjacent (eg. supporting) body, for example a relatively large loudspeaker mounted in or on the housing of audio recording or reproduction equipment, or a relatively small speaker for use close to or in the listener's ear, as in mobile telecommunications equipment or audio headphones.
The invention accordingly provides an assembly comprising a vibration-producing transducer mounted adjacent to a vibration-transmitting body and a vibration-absorbing gel gasket in contact with (preferably between) the transducer and the said body.
It has been found that gels, especially the preferred gels hereinafter described, tend to provide superior acoustic isolation performance compared with known resilient materials previously used for that purpose. The gel gasket may, for example, be arranged to reduce radiation from the housing of a speaker of sounds which are intended to be private, for example in headphones or mobile telephones; or uie gel gasket may be arranged to reduce unwanted resonance and interference between loudspeakers and their housing or adjacent loudspeakers, which might otherwise impair the fidelity of loudspeaker performance.
It will be understood that references to the vibration-transmitting body, adjacent to which the transducer is mounted, include bodies which are capable of transmitting vibrations to or from the transducer, even when not actually transmitting diem. The gasket is preferably positioned between the transducer and such a body, to which body the transducer is preferably attached by any suitable mounting means, for example screws, which are preferably loosely or flexibly connected, more preferably connected by means of vibration-absorbing material (eg. gel), to the transducer and/or to the body.
In many cases, it will be convenient that me gasket is in the form of a ring and is in contact widi a peripheral region of the transducer surrounding a more central operationally-active region thereof. The operationally active region might, for example, be an apertured area of the microphone or speaker housing through which the desired vibrations are intended to pass in operation.
Gel materials have been found especially suitable for the acoustic isolation purposes of the present invention, at least partly owing to their unique combination of cohesive strength with high elongation and flexibility. Preferably the gel of the gasket has substantially elastic deformation up to an elongation of at least 100%, ultimate tensile strength (ASTM D412) up to 2 MPa (preferably less than 1.5 MPa, more preferably less than 1 MPa), dynamic storage modulus at 0.1 Hz less than 50 kPa, and substantially zero slump at temperatures up to 100°C, preferably up to 120°C. Test methods and additional criteria for selecting advantageous gels are known per se and are for example described in EP-A-0426658 (RK308) and WO-A-9005166 (RK403), the disclosures of which are incorporated herein by reference. Cross-linked gels may be useful in some circumstances, for example polysiloxane gels such as tfiose described in EP-A-0108518 (MP0838), anhydride polymer-containing gels such as those described in WO-A-9623007 (MP1522), or polyured ane gels such as those described in US-A-4701574 (MP1027), the disclosures of all of which are incorporated herein by reference.
However, it is preferred to use thermoplastic triblock copolymer gels, which, in addition to economy and ease of processing, have been found to have a great advantage over otiier known gels for acoustic isolation, owing to the natural resonance frequency of the preferred triblock gels being unexpectedly well below d e audible range. Preferably, tiierefore, the gel of the gasket comprises a (hard-block)-(elastomeric block)-(hard block) triblock copolymer with the elastomeric block extended by at least 200 parts, preferably at least 300 parts, or possibly at least 400 parts, by weight of extender fluid per 100 parts by weight of d e block copolymer. More preferably, die said copolymer is a (hard-block)- (hydrogenated-polyalkylene block)-(hard block) triblock copolymer, preferably a styrene- (ethylene/propylene and/or ethylene/butylene)-styrene triblock copolymer.
Preferred triblock gels include those known from WO-A-9305113 (RK451), WO-A- 9323472 (RK469), or WO-A-9418273 (RK472), or from the aforementioned EP-A- 0426658 which describes addition of polyphenylene oxide to raise the softening temperature of styrene-alkylene-styrene triblock copolymer gels. For further-improved temperature resistance, it may in some cases be preferable to use gels based on mediacrylate-alkylene-methacrylate triblock copolymers as described in WO-A-9700292 (RK509). Especially preferred gels for the present purposes are those described in US-A- 4716183 (MP1102), die disclosure of which is incorporated herein by reference, comprising a blend of two different styrene-ethylene/butylene-styrene triblock copolymers, which gels have the further advantage of being flow-mouldable.
In preferred emdbodiments of the present invention, the gel of the gasket comprises 20 to 30%, preferably 22 to 27%, more preferably 23 to 25%, by weight (of the whole gel composition) of the styrene-(ethylene/propylene and/or ethylene/butylene)-styrene triblock copolymer, and 80 to 70%, preferably 78 to 73%, more preferably 77 to 75%, by weight (of the whole gel composition) of the extender fluid, possibly including known minor additives such as antioxidants, or pigments. In particular embodiments hereinafter described, me gasket comprises a 0.6 mm thick layer of gel comprising 24% by weight of Septon 2006 (Trade Mark) styrene-ethylene/propylene-styrene triblock copolymer extended with FINA A360B (Trade Mark) oil and containing 2% by weight of known antioxidant, as generally described in me aforementioned WO-A-9323472 and other references.
For many purposes, especially with relatively small transducers, it may be convenient if the gel gasket is not more than 2 mm, preferably not more than 1 mm, in thickness. It may also be acceptable, and desirable for cost control, that the gasket comprises the gel alone, in me absence of any gel support or gel carrier embedded in, or adhered to the surface of, the gel. However, thicker gaskets and/or gaskets comprising gel having carrier films or filaments embedded in it may be used if desired, for example on larger or heavier transducers such as loud speakers. Gaskets having films or filaments adhered to the outer gel surface may also be useful, although it may in some cases be undesirable thus to reduce or eliminate direct contact of the gel with the transducer and/or me adjacent body.
The gel gaskets may be formed by any convenient memod, for example by moulding, e.g. flow-moulding, or by simple die-cutting from a sheet of gel material, for example an extruded sheet profile as described in our WO-A-9709391 (RK532), or by cutting a ring gasket from a tubular profile carrier externally coated with gel, as described in our WO-A-9609483 (RK508). The shape of me gasket will be selected to suit the transducer assembly in question, round or rectangular gaskets often being convenient in practice.
The invention includes the use of a gel for at least partial acoustic isolation of a vibration-producing transducer from a vibration-transmitting body, me gasket (preferably the gel itself) being in contact with both the transducer and the said body.
A preferred form of gel gasket for the acoustic isolation of a vibration transducer from an adjacent vibration-transmitting body according to the present invention comprises a double-coated sheet having a polymeric film backing carrying the gel on both of its main surfaces. The backing, sandwiched between the two layers of gel, which may be the same or different, enhances the handling, gasket cutting, and gasket positioning characteristics when used for the purposes hereinbefore described. This double-coated gel sheet may be made of any gel and film materials which suit me requirements of the end use, but is preferably constituted as described and claimed in our WO-A-9709391 (RK532), the disclosures of which are incorporated herein by reference. Preferably, one surface of me double-coated gel sheet or gasket will be powdered with talc or other tack-reducing powder to further enhance ease of handling. It is an advantage of gels mat they are apparently able to engulf such tack-reducing particles and so achieve desirable surface contact or adhesion when pressed against a surface in use, for example when compressed between the aforesaid transducer and adjacent vibration-transmitting surface.
Specific embodiments of the present invention will now be described with reference to the accompanying drawings, wherein :-
Figure 1 shows schematically an interior view of a portable telephone handset showing the ear-piece speaker mounting; and
Figure 2 shows in partial cross-section a side view of the handset of Figure 1.
Referring to the drawings, Figure 1 shows an open half body shell B of a portable telephone (with mating half shell B in Figure 2) with an ear-piece speaker S mounted inside the half body shell B having a gel ring gasket G between the body shell and die speaker. The gasket G has an aperture A aligned between the active output portion of the speaker S and holes H in the body shell to allow the sound from the speaker to come freely out of the body shell to d e ear of the telephone user, while minimising radiation of me sound in other directions by reducing acoustic coupling dirough the body shell. The fastening screws F fit loosely through holes in the speaker body, which may have resilient (preferably gel) grommets or linings, to minimise acoustic coupling of the speaker with the body shell dirough the fastenings. Reduced acoustic coupling of speakers to body shells or housings and/or to adjacent speakers can be achieved on a larger scale, for example in loudspeaker cabinets for high-fidelity listening, or in facsimile transmission ("fax") machines, using suitably larger and/or diicker gel gaskets as required.

Claims

CLAIMS :
1. An assembly comprising a vibration-producing transducer mounted adjacent to a vibration-transmitting body and a vibration-absorbing gel gasket in contact with the transducer and the said body arranged to reduce acoustic coupling therebetween.
2. An assembly according to claim 1 , wherein the gasket is in the form of a ring and is in contact with a peripheral region of the transducer surrounding a more central operationally-active region mereof.
3. An assembly according to claim 1 or 2, wherein the transducer is an audio speaker.
4. An assembly according to claim 3, wherein the speaker is a small speaker intended for personal listening close to or in the listener's ear.
5. An assemble according to claim 4, wherein the speaker is mounted in a housing wi i the gasket arranged to reduce radiation of the speaker sound through the housing.
6. An assembly according to claim 4 or 5, wherein the gel gasket is not more than 2 mm, preferably not more than 1 mm, in thickness.
7. An assembly according to claim 3, wherein the speaker is a loudspeaker intended to project sound into a space surrounding one or more listeners, and the gasket is arranged to reduce acoustic coupling between the speaker and a housing in which it is mounted and/or between the speaker and an adjacent speaker.
8. An assembly according to any of claims 1 to 4, wherein the said body, which die transducer is mounted adjacent to, is a part of a housing of electrical equipment, preferably audio recording or reproduction equipment or telecommunications equipment.
9. An assembly according to any preceding claim, wherein me gel of die gasket has substantially elastic deformation up to an elongation of at least 100%, ultimate tensile strength (ASTM D412) up to 2 MPa, preferably less than 1.5 MPa, more preferably less than 1 MPa, dynamic storage modulus at 0.1 Hz less dian 50 kPa, and substantially zero slump at temperatures up to 100°C, preferably up to 120°C.
10. An assembly according to any preceding claim, wherein die gel of the gasket comprises a (hard-block)-(elastomeric-block)-(hard-block) triblock copolymer with the elastomeric block extended by at least 200 parts, preferably at least 300 parts, by weight of extender fluid per 100 parts by weight of the block copolymer.
11. An assembly according to claim 10, wherein the said copolymer is a (hard-block)- (hydrogenated-polyalkylene block)-(hard block) triblock copolymer, preferably a styrene- (etiiylene/propylene and/or ethylene/butylene)-styrene triblock copolymer.
12. An assembly according to claim 11, wherein the gel of the gasket comprises 20 to 30%, preferably 22 to 27%, more preferably 23 to 25%, by weight (of the whole gel composition) of d e styrene-(ethylene/propylene and/or ethylene/butylene)-styrene triblock copolymer, and 80 to 70%, preferably 78 to 73%, more preferably 77 to 75%, by weight (of the whole gel composition) of the extender fluid.
13. An assembly according to any preceding claim, wherein the gasket comprises the gel alone, in the absence of any gel support or gel carrier embedded in, or adhered to d e surface of, the gel.
14. The use of a gel for at least partial acoustic isolation of a vibration-producing transducer from a vibration-transmitting body, the gasket (preferably the gel itself) being in contact widi both die transducer and die said body.
PCT/GB1997/003337 1996-12-05 1997-12-03 Acoustic isolation of vibration transducer WO1998025438A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU52323/98A AU5232398A (en) 1996-12-05 1997-12-03 Acoustic isolation of vibration transducer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9625322.4A GB9625322D0 (en) 1996-12-05 1996-12-05 Acoustic isolation of vibration transducer
GB9625322.4 1996-12-05

Publications (1)

Publication Number Publication Date
WO1998025438A1 true WO1998025438A1 (en) 1998-06-11

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PCT/GB1997/003337 WO1998025438A1 (en) 1996-12-05 1997-12-03 Acoustic isolation of vibration transducer

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AU (1) AU5232398A (en)
GB (1) GB9625322D0 (en)
WO (1) WO1998025438A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1179968A2 (en) * 2000-08-10 2002-02-13 Shima System Co., Ltd. Structure around a speaker unit
EP2111056A1 (en) * 2007-02-07 2009-10-21 NEC Corporation Thin acoustic component mounting structure, portable acoustic apparatus, cellular phone and thin acoustic component mounting method
DE102009033317A1 (en) * 2009-07-15 2010-09-09 Siemens Medical Instruments Pte. Ltd. Receiver for completely-in-canal hearing aid used for hearing impaired persons, has plastic filling filled in hollow space formed between receiver-housing inner side and generator outer side and strongly damping acoustic waves than air

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Publication number Priority date Publication date Assignee Title
US4620317A (en) * 1984-04-05 1986-10-28 Shure Brothers, Inc. Tabletop speaker assembly
WO1988000603A2 (en) * 1986-07-18 1988-01-28 Raychem Limited Gels comprising block copolymers
JPH0273798A (en) * 1988-09-09 1990-03-13 Foster Electric Co Ltd Speaker cabinet
EP0414525A2 (en) * 1989-08-24 1991-02-27 Bose Corporation Headset cushion
JPH03108997A (en) * 1989-09-22 1991-05-09 Temuko Japan:Kk Bone conduction microphone
US5138722A (en) * 1991-07-02 1992-08-18 David Clark Company Inc. Headset ear seal
WO1993005113A1 (en) * 1991-09-06 1993-03-18 Raychem Limited Gels
JPH05252589A (en) * 1992-03-03 1993-09-28 Sharp Corp Speaker

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4620317A (en) * 1984-04-05 1986-10-28 Shure Brothers, Inc. Tabletop speaker assembly
WO1988000603A2 (en) * 1986-07-18 1988-01-28 Raychem Limited Gels comprising block copolymers
EP0426658A1 (en) * 1986-07-18 1991-05-15 Raychem Ltd Gels comprising block copolymers.
JPH0273798A (en) * 1988-09-09 1990-03-13 Foster Electric Co Ltd Speaker cabinet
EP0414525A2 (en) * 1989-08-24 1991-02-27 Bose Corporation Headset cushion
JPH03108997A (en) * 1989-09-22 1991-05-09 Temuko Japan:Kk Bone conduction microphone
US5138722A (en) * 1991-07-02 1992-08-18 David Clark Company Inc. Headset ear seal
WO1993005113A1 (en) * 1991-09-06 1993-03-18 Raychem Limited Gels
JPH05252589A (en) * 1992-03-03 1993-09-28 Sharp Corp Speaker

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Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 255 (E - 0935) 31 May 1990 (1990-05-31) *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 304 (E - 1096) 5 August 1991 (1991-08-05) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 017 (E - 1488) 12 January 1994 (1994-01-12) *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1179968A2 (en) * 2000-08-10 2002-02-13 Shima System Co., Ltd. Structure around a speaker unit
EP1179968A3 (en) * 2000-08-10 2004-12-15 Shima System Co., Ltd. Structure around a speaker unit
US6904157B2 (en) 2000-08-10 2005-06-07 Shima System Co., Ltd. Structure around a speaker unit and applied electric or electronic apparatus thereof
US7162048B2 (en) 2000-08-10 2007-01-09 Shima System Co., Ltd. Structure around a speaker unit and applied electric or electronic apparatus thereof
EP2111056A1 (en) * 2007-02-07 2009-10-21 NEC Corporation Thin acoustic component mounting structure, portable acoustic apparatus, cellular phone and thin acoustic component mounting method
EP2111056A4 (en) * 2007-02-07 2012-07-25 Nec Corp Thin acoustic component mounting structure, portable acoustic apparatus, cellular phone and thin acoustic component mounting method
US8792667B2 (en) 2007-02-07 2014-07-29 Nec Corporation Thin audio component mounting structure, portable audio device, cellular phone and method for mounting thin audio component
DE102009033317A1 (en) * 2009-07-15 2010-09-09 Siemens Medical Instruments Pte. Ltd. Receiver for completely-in-canal hearing aid used for hearing impaired persons, has plastic filling filled in hollow space formed between receiver-housing inner side and generator outer side and strongly damping acoustic waves than air

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Publication number Publication date
GB9625322D0 (en) 1997-01-22
AU5232398A (en) 1998-06-29

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