GB2229339A - Acoustic transducer - Google Patents

Acoustic transducer Download PDF

Info

Publication number
GB2229339A
GB2229339A GB9005574A GB9005574A GB2229339A GB 2229339 A GB2229339 A GB 2229339A GB 9005574 A GB9005574 A GB 9005574A GB 9005574 A GB9005574 A GB 9005574A GB 2229339 A GB2229339 A GB 2229339A
Authority
GB
United Kingdom
Prior art keywords
housing
acoustic transducer
means
membrane
characterized
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB9005574A
Other versions
GB9005574D0 (en
Inventor
Hans Woelfel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Microtel BV
Original Assignee
Microtel BV
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
Priority to NL8900613A priority Critical patent/NL8900613A/en
Application filed by Microtel BV filed Critical Microtel BV
Publication of GB9005574D0 publication Critical patent/GB9005574D0/en
Publication of GB2229339A publication Critical patent/GB2229339A/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00Diaphragms for electromechanical transducers; Cones
    • H04R7/16Mounting or tensioning of diaphragms or cones
    • H04R7/18Mounting or tensioning of diaphragms or cones at the periphery
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00Transducers of moving-armature or moving-core type
    • H04R11/06Telephone receivers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/60Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles
    • H04R25/604Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles of acoustic or vibrational transducers

Abstract

An acoustic transducer comprising - a box-shaped housing consisting of two housing sections 2,3 each comprising a rectangular base and four side walls and means for converting an electrical signal into an acoustic signal, including a membrane 30 extending substantially the entire area of a base of the housing and movably mounted in said housing by a flexible foil 40; - characterised in that said flexible foil 40 is secured to the inner sides of the four side walls of one of the housing sections, for example, by and adhesive. <IMAGE>

Description

Title: Acoustic transducer This invention relates to an acoustic transducer comprising: - a box-shaped housing consisting of two housing sections each comprising a rectangular base and four side walls positioned at right angles to the edges of the base, the two bases having substantially equal areas; - means for converting an electrical signal into an acoustic signal, including a membrane extending substantially the entire area of a base of the housing and movably mounted in said housing by a flexible means; and - an energizing means for setting the membrane into vibration under the influence of said electrical signal.

Such an acoustic transducer, which is capable of converting electrical signals into acoustic signals and the other way round, is known from U.S. Patent 3,573,397, and is used for example in a hearing aid. In it, the membrane is set into vibration in response to an electrical signal by an energizing means to generate sound waves which can leave the housing through an opening formed therein. The flexible means serves to secure the membrane within the housing in such a manner that a sound generating movement of the membrane is possible. For this purpose, in the known acoustic transducer, the flexible means is secured on the one hand to the circumference of the membrane, and on the other hand to a mounting plate, while there is further provided a second frame secured to a section of the housing, and to which the mounting plate is bonded.As a consequence, the prior acoustic transducer has a rather complex structure.

It is an object of the present invention to provide an acoustic transducer which has a simple structure and thus can be made at lower cost.

To this effect, the present invention provides an acoustic transducer of the above-defined kind, in which the flexible means is secured to the inner sides of the four side walls of one of the housing sections.

In a preferred embodiment of the invention, the flexible means has attachment portions, preferably portions bent over at right angles, extending parallel to corresponding sides of the housing sections, the flexible means being secured to the sides through said attachment portions.

To provide sufficient space for the attachment portions to be firmly secured to the side walls, the height of the inner sides of the housing section is preferably greater than the height of the attachment portions. This has the additional advantage that, in forming the flexible means, the starting product may be a flat piece of foil, made to size, on which the attachment portions can be formed, for example, by a thermal treatment. After the formation, these portions may exhibit ragged edges, which now require no trimming operation or the like owing to the overlap of the side walls of the housing section.

According to the invention, it is achieved in a simple way that the height of the inner sides of the housing section is greater than the height of the attachment portions when the height of one housing section is equal to that of the other housing section. In that case both housing sections can be formed using only one tool, it being additionally achieved that the two housing sections always fit accurately one on the other, even in the case of wear on the tool.

The invention further relates to a membrane provided with a flexible attachment means, evidently intended for use in an acoustic transducer according to this invention.

One preferred embodiment of the acoustic transducer according to this invention will now be describe, by way of example, wit preference to the accompanying drawings; in said drawings: Figure 1 is a perspective view of an acoustic transducer according to the present invention; Figures 2A-B show a cross-sectional view of the armature of the acoustic transducer shown in Figure 1; Figure 3 shows a longitudinal sectional view of the acoustic transducer of Figure 1, taken on the line III-III; and Figure 4 shows a detail of the cross-sectional view of Figure 3.

Figure 1 shows an acoustic transducer according to the present invention, generally designated by reference numeral 1. Transducer 1 comprises a first housing section 2 and a second housing section 3, each comprising a base 21, 31 and side walls 22, 23, 24, 25 and 32, 33, 34, 35, as also shown in Figure 3. The two sections 2, 3 have the same dimensions.

In the embodiment shown, lxbxh = 6.3x4.29x1.48 mm. Secured to the first housing section 2 are three tinned electrical terminals 4, and secured to the two housing sect ions 2, 3 is a tubular member 5 for passing sound to the outside. To facilitate the attachment of member 5 to housing section 3, the latter is provided with a jutting edge 6. Provided within housing 2, 3 is a membrane 30 and an energizing member indicated generally at 60. Membrane 30 is secured throughout its entire surface, which is virtually equally large as that of base 31 of housing section 3, secured to a flexible foil 40. Foil 40 projects from the surface of membrane 30, which projecting portions are secured, for example by means of an adhesive, to the inner sides of side walls 32, 33, 34, 35 of housing section 3.As best shown in Figure 4, foil 40 is provided for the purpose with portions 41, 42 bent over at right angles, and extending parallel to the corresponding side walls 32, 33 of housing section 3. After a forming procedure, these foil portions 41, 42 exhibit ragged edges 43. As the height H3 of the inside of housing section 3 is greater than the height H40 of foil portions 41, 42, these foil portions 41, 42 do not require any subsequent trimming operation or other treatment.

Energizing member 60 comprises two pole shoes 10, 11, two permanent magnets 12, 13, and a coil 14 connected to terminals 4. If desired, a coil with a center tap may be used. Provided between the permanent magnets is a space 15 terminating in a space 16 in coil 14. Movably disposed within spaces 15, 16 is a central leg 20 of an armature 21. Armature 21 is best shown in Figure 2; in it, Figure 2A illustrates a top plan view of armature 21, and Figure 2B a cross-sectional view taken on the line B-B of Figure 2A. When a current flows through coil 14, then as a result of the magnetic flux thus generated, in interaction with the constant flux of the permanent magnets, a force will be exercised on central leg 20 to movie the same in vertical direction.The vertical movement of leg 20 is transmitted by a motion transmitting member 22 to membrane 30, which is provided with profiling 31, 32 for enhanced stiffness. Foil 40 is provided with bellows-like folds or pleats 44 along the edge 33 of membrane 30 located closest to the motion transmitting member 22, and along the two adjoining edges. As a result, membrane 30 can follow the movements of the central leg 20 of armature 21 as transmitted by motion transmitting member 22 without any impediments. Along the edge 34 of membrane 30 located most remotely from motion transmitting member 22, foil 40 merges into the foil portion bent over at right angles without bellows-like folds, to prevent vertical movements of the edge 34 of membrane 30, so that membrane 30 can only perform a pivoting movement about edge 34. This prevents undesirable movement modes of membrane 30. To restrict the vertical movement of edge 34 still further, housing section 30 is provided with an inward projection 8 (Figure 3) to which the underside of foil 40 is bonded.

When membrane 30 moves, pressure waves are generated in the space 50 defined by housing section 3 and membrane 30, which pressure waves can leave housing section 3 through an opening 9 which terminates in member 5.

Claims (7)

1. An acoustic transducer comprising - a box-shaped housing consisting of two housing sections each comprising a rectangular base and four side walls positioned at right angles to the edges of the base, the two bases having substantially equal areas; - means for converting an electrical signal into an acoustic signal, including a membrane extending substantially the entire area of a base of the housing and movably mounted in said housing by a flexible means; and - an energizing means for setting the membrane into vibration under the influence of said electrical signal; characterized in that said flexible means is secured to the inner sides of the four side walls of one of the housing sections.
2. An acoustic transducer as claimed in claim 1, characterized in that said flexible means has attachment portions extending parallel to corresponding sides of the housing section, and that said flexible means is secured to said sides through said attachment portions.
3. An acoustic transducer according to claim 2, characterized in that said flexible means has portions bent over at right angles.
4. An acoustic transducer as claimed in claim 2 or 3, characterized in that the height of the inner sides of the housing section is greater than the height of said attachment portions.
5. An acoustic transducer as claimed in any of claims 1-4, characterized in that the two housing sections have the same height.
6. A membrane provided with a flexible attachment means, and evidently intended for use in an acoustic transducer as claimed in any of claims 1-5.
7. An acoustic transducer substantially as herein described with reference to, and as shown in, the accompanying drawings.
GB9005574A 1989-03-14 1990-03-13 Acoustic transducer Withdrawn GB2229339A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL8900613A NL8900613A (en) 1989-03-14 1989-03-14 Acoustic transducer.

Publications (2)

Publication Number Publication Date
GB9005574D0 GB9005574D0 (en) 1990-05-09
GB2229339A true GB2229339A (en) 1990-09-19

Family

ID=19854283

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9005574A Withdrawn GB2229339A (en) 1989-03-14 1990-03-13 Acoustic transducer

Country Status (3)

Country Link
JP (1) JPH02274200A (en)
GB (1) GB2229339A (en)
NL (1) NL8900613A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1000880C2 (en) * 1995-07-24 1997-01-28 Microtronic Nederland Bv Transducer.
EP0851710A1 (en) * 1996-12-23 1998-07-01 Microtronic Nederland B.V. Electroacoustic transducer
WO2000060902A1 (en) * 1999-04-06 2000-10-12 Microtronic Nederland B.V. Electroacoustic transducer with a diaphragm, and method for fixing a diaphragm in such transducer
WO2001087008A3 (en) * 2000-05-09 2002-08-01 Knowles Electronics Llc Armature for a receiver
WO2007064356A1 (en) * 2005-11-30 2007-06-07 Knowles Electronics, Llc Balanced armature bone conduction shaker
US7706561B2 (en) 1999-04-06 2010-04-27 Sonion Nederland B.V. Electroacoustic transducer with a diaphragm and method for fixing a diaphragm in such transducer
US7817815B2 (en) 2000-05-09 2010-10-19 Knowles Electronics, Llc Armature for a receiver
WO2013044550A1 (en) * 2011-09-30 2013-04-04 苏州恒听电子有限公司 Armature apparatus for moving iron microphone/transducer
US9888322B2 (en) 2014-12-05 2018-02-06 Knowles Electronics, Llc Receiver with coil wound on a stationary ferromagnetic core

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5540921B2 (en) * 2010-06-17 2014-07-02 ソニー株式会社 Acoustic transducer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3573397A (en) * 1967-05-16 1971-04-06 Tibbetts Industries Acoustic diaphragm and translating device utilizing same
GB2011761A (en) * 1977-12-28 1979-07-11 Microtel Bv Transducer of the electret type
GB2019694A (en) * 1978-04-25 1979-10-31 Polaroid Corp Electroacoustical transducers and mehtod of mounting diaphragms therein
GB2086694A (en) * 1980-10-29 1982-05-12 Tibbetts Industries Cell assembly for electret transducer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3573397A (en) * 1967-05-16 1971-04-06 Tibbetts Industries Acoustic diaphragm and translating device utilizing same
GB2011761A (en) * 1977-12-28 1979-07-11 Microtel Bv Transducer of the electret type
GB2019694A (en) * 1978-04-25 1979-10-31 Polaroid Corp Electroacoustical transducers and mehtod of mounting diaphragms therein
GB2086694A (en) * 1980-10-29 1982-05-12 Tibbetts Industries Cell assembly for electret transducer

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5757947A (en) * 1995-07-24 1998-05-26 Microtronic Nederland, B.V. Transducer
NL1000880C2 (en) * 1995-07-24 1997-01-28 Microtronic Nederland Bv Transducer.
NL1004877C2 (en) * 1996-12-23 1998-08-03 Microtronic Nederland Bv Electroacoustic transducer.
US6078677A (en) * 1996-12-23 2000-06-20 Microtronic Nederlands B.V. Electroacoustic transducer with improved diaphragm attachment
EP0851710A1 (en) * 1996-12-23 1998-07-01 Microtronic Nederland B.V. Electroacoustic transducer
US7492919B2 (en) 1999-04-06 2009-02-17 Sonion Nederland B.V. Method for fixing a diaphragm in an electroacoustic transducer
WO2000060902A1 (en) * 1999-04-06 2000-10-12 Microtronic Nederland B.V. Electroacoustic transducer with a diaphragm, and method for fixing a diaphragm in such transducer
US7706561B2 (en) 1999-04-06 2010-04-27 Sonion Nederland B.V. Electroacoustic transducer with a diaphragm and method for fixing a diaphragm in such transducer
US7110565B1 (en) 1999-04-06 2006-09-19 Sonionmicrotonic Nederland B.V. Electroacoustic transducer with a diaphragm, and method for fixing a diaphragm in such transducer
US8027492B2 (en) 2000-05-09 2011-09-27 Knowles Electronics, Llc Armature for a receiver
US7443997B2 (en) 2000-05-09 2008-10-28 Knowles Electronics, Llc. Armature for a receiver
WO2001087008A3 (en) * 2000-05-09 2002-08-01 Knowles Electronics Llc Armature for a receiver
US7817815B2 (en) 2000-05-09 2010-10-19 Knowles Electronics, Llc Armature for a receiver
WO2007064356A1 (en) * 2005-11-30 2007-06-07 Knowles Electronics, Llc Balanced armature bone conduction shaker
US7869610B2 (en) 2005-11-30 2011-01-11 Knowles Electronics, Llc Balanced armature bone conduction shaker
WO2013044550A1 (en) * 2011-09-30 2013-04-04 苏州恒听电子有限公司 Armature apparatus for moving iron microphone/transducer
US9888322B2 (en) 2014-12-05 2018-02-06 Knowles Electronics, Llc Receiver with coil wound on a stationary ferromagnetic core

Also Published As

Publication number Publication date
JPH02274200A (en) 1990-11-08
GB9005574D0 (en) 1990-05-09
NL8900613A (en) 1990-10-01

Similar Documents

Publication Publication Date Title
US3449531A (en) Electro-mechanical transducer
US3141071A (en) Full range electroacoustic transducers
JP3556168B2 (en) Bone conduction speaker
US3979566A (en) Electromagnetic transducer
US4675907A (en) Electro-vibration transducer
DK2466915T3 (en) Multilayer luminaire for a movable luminaire receiver
US7492919B2 (en) Method for fixing a diaphragm in an electroacoustic transducer
EP0296139A2 (en) Audio transducer
DE69935334T2 (en) Low frequency schwinger
US20070009133A1 (en) Loudspeaker
EP0424916B1 (en) Magnetically shielded electromagnetic acoustic transducer
US6411723B1 (en) Loudspeakers
US5528697A (en) Integrated vibrating and sound producing device
JP2009543421A (en) Multi-function micro speaker
US3935398A (en) Transducer with improved armature and yoke construction
US5624155A (en) Electromagnetic transducer
DE69233156D1 (en) Improved hearing aid
US4728934A (en) Tactile stimulation device for hearing-impaired individuals
US5647013C1 (en) Electroacoustic transducer
US3366749A (en) Audio transducer
US6668065B2 (en) Bone-conduction transducer and bone-conduction speaker headset therewith
GB2333927B (en) Electro-acoustic transducer
US6078677A (en) Electroacoustic transducer with improved diaphragm attachment
US4586192A (en) Soundstage boundary expansion system
US5795287A (en) Tinnitus masker for direct drive hearing devices

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)