EP0667093B1 - Electroacoustic transducer - Google Patents

Electroacoustic transducer Download PDF

Info

Publication number
EP0667093B1
EP0667093B1 EP93923007A EP93923007A EP0667093B1 EP 0667093 B1 EP0667093 B1 EP 0667093B1 EP 93923007 A EP93923007 A EP 93923007A EP 93923007 A EP93923007 A EP 93923007A EP 0667093 B1 EP0667093 B1 EP 0667093B1
Authority
EP
European Patent Office
Prior art keywords
reed
transducer
formations
coil
magnets
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.)
Expired - Lifetime
Application number
EP93923007A
Other languages
German (de)
French (fr)
Other versions
EP0667093A1 (en
Inventor
Richard James Salvage
Steven John Harrington
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.)
Knowles Europe Ltd
Knowles Electronics LLC
Original Assignee
Knowles Europe Ltd
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 Europe Ltd filed Critical Knowles Europe Ltd
Priority to EP97103200A priority Critical patent/EP0784415B1/en
Priority to EP99102640A priority patent/EP0924961B1/en
Publication of EP0667093A1 publication Critical patent/EP0667093A1/en
Application granted granted Critical
Publication of EP0667093B1 publication Critical patent/EP0667093B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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.
  • An electric transducer of this general type is described in our British Patent 2095510, and typically includes 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 arrangement is such that when the moving part of the reed shifts in one direction or another away from a centralised position between the two poles, the magnetic flux is caused to flow in one direction or the other along the reed and hence through the coil.
  • the reed is attached to a diaphragm and in this way the vibrations of the diaphragm caused by received sound are converted into corresponding currents in the coil or vice versa.
  • the coil tunnel has a restricted central portion which limits the degree of deflection available to the reed and hence reduces the possible damage.
  • this solution is only available when the coil is set in epoxy having been wound on a flexible removable plastic former. This method of construction is only appropriate for certain types of transducer and has a number of limitations.
  • 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 of the reed is provided with a formation on either side thereof.
  • formations are deformations in the reed.
  • 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.
  • 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 semispherical 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.
  • 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.

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

This invention relates to electroacoustic transducers which incorporate a reed armature 17. Formations (25, 26, 27, 28 and 29) are provided for mounting the deflection of the reed 17. <IMAGE>

Description

This invention relates to electroacoustic transducers of the type which incorporate a reed armature.
An electric transducer of this general type is described in our British Patent 2095510, and typically includes 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 arrangement is such that when the moving part of the reed shifts in one direction or another away from a centralised position between the two poles, the magnetic flux is caused to flow in one direction or the other along the reed and hence through the coil. The reed is attached to a diaphragm and in this way the vibrations of the diaphragm caused by received sound are converted into corresponding currents in the coil or vice versa. It is very easy to damage the reed by over deflection, if the transducer experiences a shock e.g. from being dropped, in addition the tip portion may strike the magnet with considerable force. It will be understood that a similar configuration can be used for a receiver or loudspeaker.
In one transducer the coil tunnel has a restricted central portion which limits the degree of deflection available to the reed and hence reduces the possible damage. However because coils in such transducer are almost always formless, this solution is only available when the coil is set in epoxy having been wound on a flexible removable plastic former. This method of construction is only appropriate for certain types of transducer and has a number of limitations.
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 of the reed is provided with a formation on either side thereof.
In a particularly preferred embodiment formations are deformations in the reed. Where the reed is flat and elongate, the formations are preferably formed by pressing out sections of the reed at or adjacent the longitudinal axis of the reed. By pressing, or otherwise deforming, the formation or formations from the reed, the limitation on the movement of the reed can be achieved without adding any mass to the reed, or indeed the transducer as a whole. However by restricting the formation or formations to the area of the central axis of the reed, no additional restriction on the lateral position of the reed within the tunnel is introduced and extra restrictions on its rotational positions are limited. Further such formations can be pressed with considerable accuracy, which is important when the dimensions and tolerances involved are extremely small as is the case where the transducer is for use in a hearing aid.
In this construction the formation or formations may be semi-spherical, ridges or star shapes or a combination thereof.
In another arrangement the formation or formations may be constituted by a body or bodies mounted on the reed. For example 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. These arrangements are somewhat less preferred, because they add weight to the reed and in the latter case the control of dimensions is more difficult. However, in certain cases, there may be advantages where the localised deformation of the reed undesirably affects its flexing properties.
The invention may be performed in various ways and specific embodiments will now be described in reference to the accompanying drawings, in which:
  • 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; and
  • Figures 6 and 7 are schematic views generally corresponding to Figure 1 showing alternative arrangements.
    • 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. As can be seen in Figure 1 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. As can be best seen in Figures 4 and 5 the formations 20,21 are generally semispherical and are pressed out of the plane of the reed.
    As can be seen in Figures 2 and 3 the formations 20,21 respectively engage the coil 12 when the reed is deflected upwardly or downwardly beyond its normal working range. Preferably 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.
    It will be appreciated that 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.
    As has been explained above this construction has particular advantages; for example no extra mass is added to the reed 17. However many of the advantages of the invention can be obtained with other arrangements and examples of these are briefly described in connection with Figures 6 and 7.
    In Figure 6 the formations 20,21 are formed by blobs of adhesive or other settable material. In Figure 7 the formations 20,21 are formed by a sleeve 23 slid onto the reed 17.
    It will be understood that the restriction principles recited in this description are applicable to many other reed mountings and configurations within the scope of the claims.

    Claims (8)

    1. An electroacoustic transducer (10) including a pair of spaced permanent magnets (13, 14), a coil (12) having a tunnel (18) therethrough and a reed armature (17) having a central portion (19) which extends through the coil and a tip portion which lies at least partially between the magnets, the reed (17) being mounted for deflection towards or away from the respective magnets, wherein the central portion (19) of the reed is provided with a formation (20, 21) on either side thereof.
    2. A transducer as claimed in Claim 1, wherein the formations (20, 21) are opposed deformations in the reed (17).
    3. A transducer as claimed in Claim 2, wherein the reed (17) is flat and elongate and the formations (20, 21) are formed at or adjacent the longitudinal axis of the reed.
    4. A transducer as claimed in Claim 3, wherein the formations (20, 21) are pressed out of the plane of the reed (17).
    5. A transducer as claimed in any one of Claims 1 to 4, wherein the formations (20, 21) are semi-spherical, ridges or star shaped or a combination thereof.
    6. A transducer as claimed in any one of Claims 1 to 3, wherein the formations (20, 21) are constituted by a body (23) or bodies mounted on the reed.
    7. A transducer as claimed in Claim 6, wherein the body (23) is in the form of a sleeve mounted on the reed.
    8. A transducer as claimed in Claim 7, wherein the body is in the form of a lump of settable material deposited on the reed (17).
    EP93923007A 1992-10-29 1993-10-15 Electroacoustic transducer Expired - Lifetime EP0667093B1 (en)

    Priority Applications (2)

    Application Number Priority Date Filing Date Title
    EP97103200A EP0784415B1 (en) 1992-10-29 1993-10-15 Electroacoustic transducer
    EP99102640A EP0924961B1 (en) 1992-10-29 1993-10-15 Electroacoustic transducer

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    GB929222677A GB9222677D0 (en) 1992-10-29 1992-10-29 Electroacoustic transducer
    GB9222677 1992-10-29
    PCT/GB1993/002140 WO1994010817A1 (en) 1992-10-29 1993-10-15 Electroacoustic transducer

    Related Child Applications (2)

    Application Number Title Priority Date Filing Date
    EP97103200A Division EP0784415B1 (en) 1992-10-29 1993-10-15 Electroacoustic transducer
    EP97100314 Division 1997-01-10

    Publications (2)

    Publication Number Publication Date
    EP0667093A1 EP0667093A1 (en) 1995-08-16
    EP0667093B1 true EP0667093B1 (en) 1998-01-07

    Family

    ID=10724218

    Family Applications (3)

    Application Number Title Priority Date Filing Date
    EP99102640A Expired - Lifetime EP0924961B1 (en) 1992-10-29 1993-10-15 Electroacoustic transducer
    EP97103200A Expired - Lifetime EP0784415B1 (en) 1992-10-29 1993-10-15 Electroacoustic transducer
    EP93923007A Expired - Lifetime EP0667093B1 (en) 1992-10-29 1993-10-15 Electroacoustic transducer

    Family Applications Before (2)

    Application Number Title Priority Date Filing Date
    EP99102640A Expired - Lifetime EP0924961B1 (en) 1992-10-29 1993-10-15 Electroacoustic transducer
    EP97103200A Expired - Lifetime EP0784415B1 (en) 1992-10-29 1993-10-15 Electroacoustic transducer

    Country Status (9)

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

    Families Citing this family (7)

    * 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.
    NL1000878C2 (en) * 1995-07-24 1997-01-28 Microtronic Nederland Bv Transducer.
    US7321664B2 (en) 2004-01-13 2008-01-22 Sonionmicrotronic Nederland B.V. Receiver having an improved bobbin
    KR101376027B1 (en) * 2012-03-20 2014-03-19 신 렬 이 High Power Slim Electromagnet Speaker
    US9485585B2 (en) 2013-10-17 2016-11-01 Knowles Electronics, Llc Shock resistant coil and receiver
    DE102018221577A1 (en) 2017-12-30 2019-07-04 Knowles Electronics, Llc ELECTRIC ACOUSTIC CONVERTER WITH IMPROVED SHOCK PROTECTION
    US11659337B1 (en) 2021-12-29 2023-05-23 Knowles Electronics, Llc Balanced armature receiver having improved shock performance

    Family Cites Families (7)

    * 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
    GB1364669A (en) * 1971-12-23 1974-08-29 Standard Telephones Cables Ltd Electro acoustic transducers
    US4272654A (en) * 1979-01-08 1981-06-09 Industrial Research Products, Inc. Acoustic transducer of improved construction
    GB2085694B (en) * 1980-10-02 1984-02-01 Standard Telephones Cables Ltd Balanced armature transducers
    US4956868A (en) * 1989-10-26 1990-09-11 Industrial Research Products, Inc. Magnetically shielded electromagnetic acoustic transducer

    Also Published As

    Publication number Publication date
    DE69331717T2 (en) 2002-10-31
    EP0667093A1 (en) 1995-08-16
    AU5284193A (en) 1994-05-24
    WO1994010817A1 (en) 1994-05-11
    GB9222677D0 (en) 1992-12-09
    DE69331913D1 (en) 2002-06-13
    DE69316233D1 (en) 1998-02-12
    EP0784415A1 (en) 1997-07-16
    EP0924961B1 (en) 2002-03-13
    CA2146969C (en) 2000-12-26
    AU682831B2 (en) 1997-10-23
    EP0924961A1 (en) 1999-06-23
    DK0784415T3 (en) 2002-08-19
    EP0784415B1 (en) 2002-05-08
    JPH08502635A (en) 1996-03-19
    CA2146969A1 (en) 1994-05-11
    DE69316233T2 (en) 1998-05-28
    DK0667093T3 (en) 1998-09-07
    ATE162038T1 (en) 1998-01-15
    DE69331717D1 (en) 2002-04-18
    DE69331913T2 (en) 2002-11-28

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