WO1994010817A1 - Transducteur electroacoustique - Google Patents

Transducteur electroacoustique Download PDF

Info

Publication number
WO1994010817A1
WO1994010817A1 PCT/GB1993/002140 GB9302140W WO9410817A1 WO 1994010817 A1 WO1994010817 A1 WO 1994010817A1 GB 9302140 W GB9302140 W GB 9302140W WO 9410817 A1 WO9410817 A1 WO 9410817A1
Authority
WO
WIPO (PCT)
Prior art keywords
reed
transducer
tunnel
formations
coil
Prior art date
Application number
PCT/GB1993/002140
Other languages
English (en)
Inventor
Richard James Salvage
Steven John Harrington
Original Assignee
Knowles Electronics Co.
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 Knowles Electronics Co. filed Critical Knowles Electronics Co.
Priority to JP6510796A priority Critical patent/JPH08502635A/ja
Priority to EP93923007A priority patent/EP0667093B1/fr
Priority to CA002146969A priority patent/CA2146969C/fr
Priority to DE69316233T priority patent/DE69316233T2/de
Priority to DK93923007T priority patent/DK0667093T3/da
Priority to AU52841/93A priority patent/AU682831B2/en
Publication of WO1994010817A1 publication Critical patent/WO1994010817A1/fr
Priority to US08416887 priority patent/US5647013C1/en

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
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/04—Microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/02—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
    • H04R2205/041—Adaptation of stereophonic signal reproduction for the hearing impaired
    • 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

Definitions

  • This invention relates to electroacoustic transducers * ⁇ of the type which incorporate a reed armature.
  • the tip portion may
  • the coil tunnel has a restricted
  • the present invention consists in an electroacoustic transducer including a pair of spaced permanent magnets, a coil having a tunnel therethrough and a reed armature having a central portion which extends through the coil and a tip portion which lies at least partially between the magnets, the reed being mounted for deflection towards or away from the respective magnets, wherein the central portion and/or the tip of the reed is provided with a formation and/or a restriction is provided between the coil and the magnets, or at the magnet end of the tunnel, for limiting the available deflection of the reed.
  • the formations are preferably on the central portion to reduce distortion of the magnetic field.
  • the formations are preferably formed by pressing out sections of the reed at or adjacent the longitudinal axis of the reed.
  • the formation or formations may be semi-spherical, ridges or star shapes or a combination thereof.
  • the formation or formations may be constituted by a body or bodies mounted on the reed.
  • the body may be in the form of a sleeve or may be in the form of some settable or deposited material or may simply be a body attached to the reed.
  • a restriction may be provided at or adjacent the end of the tunnel either by means of a spacer between the magnets and the coil with the restricted opening therein or in the form of an insert which can be pressed into the magnet end of the tunnel. In either case it is preferred that the restriction is constructed only to engage an area close to or adjacent the longitudinal axis of the reed.
  • the invention consists in an electroacoustic transducer including a pair of spaced permanent magnets, a coil having a tunnel therethrough and a flat elongate reed armature having a central portion which extends through the coil tunnel and a tip portion which lies at least partially between the magnets, the reed being mounted for deflection towards or away from the respective magnets, wherein the tunnel is defined solely by the windings of the coil and at least one part of the cross- section of the tunnel is dimensioned or shaped to restrict movement of the reed in a direction orthogonal to its plane.
  • the part may thus be narrower than the rest of the tunnel in the direction of reed movement or the tunnel may be formed with a formation or formations for engaging a part of the reed before the tunnel wall would otherwise be engaged by the reed.
  • the formation or formations are in this case non-reentrant to avoid problems in winding the coil.
  • the formations may cut off the corners of an otherwise rectangular cross-sectioned tunnel.
  • Figure 1 is a cross sectional stylised view through an electroacoustic transducer with the reed in its central position;
  • Figure 2 shows the reed in its extreme upward position
  • Figure 3 shows the reed in its extreme downward position
  • Figure 4 is a view from above of the reed of the transducers Figures 1 to 3;
  • Figure 5 is a cross sectional view of the reed of Figure 4 along the line of IV - IV;
  • Figures 6 to 9 are schematic views generally corresponding to Figure 1 showing alternative arrangements.
  • Figures 10 to 12 show a number of tunnel cross-sections for use in an alternative form of the invention.
  • An electroacoustic transducer 10 is schematically shown in Figures 1 to 3 and comprises a coil 12, magnets 13,14, pole pieces 15,16 and reed armature 17.
  • the coil 12 defines a central tunnel 18 and the magnets 13,14 are spaced apart.
  • the reed armature 17 extends along the tunnel 18 and between the magnets 13,14.
  • a central portion 19 of the reed 17 lies within the tunnel 18 and, adjacent one end of that central portion 19, are formed opposed formations 20,21.
  • the formations 20,21 are generally semi- spherical and are pressed out of the plane of the reed.
  • the formations 20,21 respectively engage the coil 12 when the reed is deflected upwardly or downwardly beyond its normal working range.
  • the formations are sized to prevent the tip 22 of the reed 17 striking the magnets 13,14, but considerable protection can also be provided if they are dimensioned so that they strike the coil 12, before the tip 22 strikes either the magnet 13 or magnet 14. It has been discovered that a transducer constructed in this manner can be dropped from, typically, twice the height, without incurring damage to the reed, as compared with an identical transducer without the formations. Put another way this means it can, typically, receive up to 4 times the shock without damage.
  • the formations could have other conventional shapes, but they are confined to the general area of the longitudinal axis of the reed 17 so that their existence introduces as little restriction as possible on the rotational or lateral position of the reed 17 within the tunnel 18. In a construction where this was not a factor, the formations could be at the sides of the reed 17 or extend right across it.
  • the formations 20,21 are formed by blobs of adhesive or other settable material.
  • the formations 20,21 are formed by a sleeve 23 slid onto the reed 17.
  • Figures 8 and 9 show an another approach in which a restriction is introduced either between the magnets 13,14 or the coil 12 or at the magnet end of the tunnel 18, so that the restriction engages the reed 17 to limit the deflection in a similar manner to that achieved by the formations mentioned above.
  • a spacer 24 has a restricted opening 25 whilst in Figure 9 an insert 26 is pressed into the end of the tunnel 18 or created using settable plastic material.
  • the restriction so created is confined to the area of the longitudinal axis for the reasons mentioned above.
  • FIG. 10 to 12 A further approach is illustrated in Figures 10 to 12 in which the coil 12, which has its tunnel 18 defined purely by its windings, is wound in such a way that at least one part of its cross-section the tunnel walls are formed to engage the reed 17 in a way which reduces damaging deflections of the reed.
  • the coil 12 is wound with projections 27 projecting into the tunnel 18; in Figure 11, which is a longitudinal section of the coil 12, the tunnel has a reduced cross-section at 28 and in Figure 12 the corners of the rectangular tunnel 18 are cut off to provide inclined reed engaging surfaces 29.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Headphones And Earphones (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

Cette invention se rapporte à des transducteurs électroacoustiques du type comprenant un induit à lame souple. Ainsi, un transducteur (10) comprend une bobine (12), des aimants (13, 14), des pièces polaires (15, 16) et un induit à lame souple (17) qui passe à travers un passage central (18) défini par la bobine. Une partie centrale (19) de la lame (17) se situe à l'intérieur du passage et présente des structures opposées (20, 21) qui limitent la déflexion possible de la lame (17). D'autres agencements permettant de limiter la déflexion sont également décrits.
PCT/GB1993/002140 1992-10-29 1993-10-15 Transducteur electroacoustique WO1994010817A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP6510796A JPH08502635A (ja) 1992-10-29 1993-10-15 電気音響トランスジューサ
EP93923007A EP0667093B1 (fr) 1992-10-29 1993-10-15 Transducteur electroacoustique
CA002146969A CA2146969C (fr) 1992-10-29 1993-10-15 Transducteur electroacoustique
DE69316233T DE69316233T2 (de) 1992-10-29 1993-10-15 Elektroakustischer wandler
DK93923007T DK0667093T3 (da) 1992-10-29 1993-10-15 Elektroakustisk transducer
AU52841/93A AU682831B2 (en) 1992-10-29 1993-10-15 Electroacoustic transducer
US08416887 US5647013C1 (en) 1992-10-29 1995-06-02 Electroacoustic transducer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB929222677A GB9222677D0 (en) 1992-10-29 1992-10-29 Electroacoustic transducer
GB9222677.8 1992-10-29

Publications (1)

Publication Number Publication Date
WO1994010817A1 true WO1994010817A1 (fr) 1994-05-11

Family

ID=10724218

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/002140 WO1994010817A1 (fr) 1992-10-29 1993-10-15 Transducteur electroacoustique

Country Status (9)

Country Link
EP (3) EP0924961B1 (fr)
JP (1) JPH08502635A (fr)
AT (1) ATE162038T1 (fr)
AU (1) AU682831B2 (fr)
CA (1) CA2146969C (fr)
DE (3) DE69331913T2 (fr)
DK (2) DK0667093T3 (fr)
GB (1) GB9222677D0 (fr)
WO (1) WO1994010817A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1000878C2 (nl) * 1995-07-24 1997-01-28 Microtronic Nederland Bv Transducer.
NL1000880C2 (nl) * 1995-07-24 1997-01-28 Microtronic Nederland Bv Transducer.
EP1555850A1 (fr) * 2004-01-13 2005-07-20 Sonionmicrotronic Nederland B.V. Récepteur pour une protèse auditive ayant une bobine améliorée

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101376027B1 (ko) * 2012-03-20 2014-03-19 신 렬 이 대출력 박형 전자석 스피커
US9485585B2 (en) 2013-10-17 2016-11-01 Knowles Electronics, Llc Shock resistant coil and receiver
DE102018221577A1 (de) 2017-12-30 2019-07-04 Knowles Electronics, Llc Elektroakustischer wandler mit verbessertem stoss-schutz
US11659337B1 (en) 2021-12-29 2023-05-23 Knowles Electronics, Llc Balanced armature receiver having improved shock performance

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3005880A (en) * 1960-05-06 1961-10-24 Elvin D Simshauser Non-linear transducer armature
US3671684A (en) * 1970-11-06 1972-06-20 Tibbetts Industries Magnetic transducer
US3836733A (en) * 1971-12-23 1974-09-17 Int Standard Electric Corp Electro-acoustic armature transducer
US3935398A (en) * 1971-07-12 1976-01-27 Industrial Research Products, Inc. Transducer with improved armature and yoke construction
US4272654A (en) * 1979-01-08 1981-06-09 Industrial Research Products, Inc. Acoustic transducer of improved construction
GB2085694A (en) * 1980-10-02 1982-04-28 Standard Telephones Cables Ltd Balanced armature transducers

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4956868A (en) * 1989-10-26 1990-09-11 Industrial Research Products, Inc. Magnetically shielded electromagnetic acoustic transducer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3005880A (en) * 1960-05-06 1961-10-24 Elvin D Simshauser Non-linear transducer armature
US3671684A (en) * 1970-11-06 1972-06-20 Tibbetts Industries Magnetic transducer
US3935398A (en) * 1971-07-12 1976-01-27 Industrial Research Products, Inc. Transducer with improved armature and yoke construction
US3836733A (en) * 1971-12-23 1974-09-17 Int Standard Electric Corp Electro-acoustic armature transducer
US4272654A (en) * 1979-01-08 1981-06-09 Industrial Research Products, Inc. Acoustic transducer of improved construction
GB2085694A (en) * 1980-10-02 1982-04-28 Standard Telephones Cables Ltd Balanced armature transducers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1000878C2 (nl) * 1995-07-24 1997-01-28 Microtronic Nederland Bv Transducer.
NL1000880C2 (nl) * 1995-07-24 1997-01-28 Microtronic Nederland Bv Transducer.
EP1555850A1 (fr) * 2004-01-13 2005-07-20 Sonionmicrotronic Nederland B.V. Récepteur pour une protèse auditive ayant une bobine améliorée
US7321664B2 (en) 2004-01-13 2008-01-22 Sonionmicrotronic Nederland B.V. Receiver having an improved bobbin

Also Published As

Publication number Publication date
DE69331717T2 (de) 2002-10-31
EP0667093A1 (fr) 1995-08-16
AU5284193A (en) 1994-05-24
GB9222677D0 (en) 1992-12-09
EP0667093B1 (fr) 1998-01-07
DE69331913D1 (de) 2002-06-13
DE69316233D1 (de) 1998-02-12
EP0784415A1 (fr) 1997-07-16
EP0924961B1 (fr) 2002-03-13
CA2146969C (fr) 2000-12-26
AU682831B2 (en) 1997-10-23
EP0924961A1 (fr) 1999-06-23
DK0784415T3 (da) 2002-08-19
EP0784415B1 (fr) 2002-05-08
JPH08502635A (ja) 1996-03-19
CA2146969A1 (fr) 1994-05-11
DE69316233T2 (de) 1998-05-28
DK0667093T3 (da) 1998-09-07
ATE162038T1 (de) 1998-01-15
DE69331717D1 (de) 2002-04-18
DE69331913T2 (de) 2002-11-28

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