EP0784415A1 - Elektroakustischer Wandler - Google Patents

Elektroakustischer Wandler Download PDF

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Publication number
EP0784415A1
EP0784415A1 EP97103200A EP97103200A EP0784415A1 EP 0784415 A1 EP0784415 A1 EP 0784415A1 EP 97103200 A EP97103200 A EP 97103200A EP 97103200 A EP97103200 A EP 97103200A EP 0784415 A1 EP0784415 A1 EP 0784415A1
Authority
EP
European Patent Office
Prior art keywords
reed
tunnel
coil
magnets
transducer
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.)
Granted
Application number
EP97103200A
Other languages
English (en)
French (fr)
Other versions
EP0784415B1 (de
Inventor
Richard James Salvage
Steven John Dr. 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 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 EP99102640A priority Critical patent/EP0924961B1/de
Publication of EP0784415A1 publication Critical patent/EP0784415A1/de
Application granted granted Critical
Publication of EP0784415B1 publication Critical patent/EP0784415B1/de
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 an aperture is defined in a spacer located between the coil and the magnets for limiting the available deflection of the reed, the dimension of the aperture, the direction of deflection of the reed, being smaller than the corresponding dimension of the tunnel.
  • 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-re-entrant to avoid problems in winding the coil.
  • the formations may cut off the corners of an otherwise rectangular cross-sectioned tunnel.
  • FIG. 1 An electroacoustic transducer 10 is schematically shown in Figures 1 to 3.
  • the Figures illustrate an arrangement claimed in our co-pending European Patent Application No. 93923007.4, but are retained so as to illustrate the operation of the subsequent embodiments.
  • the transducer 10 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.
  • 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.
  • the coil 12 is wound with projections 27 projection 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)
EP97103200A 1992-10-29 1993-10-15 Elektroakustischer Wandler Expired - Lifetime EP0784415B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99102640A EP0924961B1 (de) 1992-10-29 1993-10-15 Elektroakustischer Wandler

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9222677 1992-10-29
GB929222677A GB9222677D0 (en) 1992-10-29 1992-10-29 Electroacoustic transducer
EP93923007A EP0667093B1 (de) 1992-10-29 1993-10-15 Elektroakustischer wandler

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP93923007A Division EP0667093B1 (de) 1992-10-29 1993-10-15 Elektroakustischer wandler
EP93923007.4 Division 1994-05-11

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP99102640A Division EP0924961B1 (de) 1992-10-29 1993-10-15 Elektroakustischer Wandler

Publications (2)

Publication Number Publication Date
EP0784415A1 true EP0784415A1 (de) 1997-07-16
EP0784415B1 EP0784415B1 (de) 2002-05-08

Family

ID=10724218

Family Applications (3)

Application Number Title Priority Date Filing Date
EP97103200A Expired - Lifetime EP0784415B1 (de) 1992-10-29 1993-10-15 Elektroakustischer Wandler
EP99102640A Expired - Lifetime EP0924961B1 (de) 1992-10-29 1993-10-15 Elektroakustischer Wandler
EP93923007A Expired - Lifetime EP0667093B1 (de) 1992-10-29 1993-10-15 Elektroakustischer wandler

Family Applications After (2)

Application Number Title Priority Date Filing Date
EP99102640A Expired - Lifetime EP0924961B1 (de) 1992-10-29 1993-10-15 Elektroakustischer Wandler
EP93923007A Expired - Lifetime EP0667093B1 (de) 1992-10-29 1993-10-15 Elektroakustischer wandler

Country Status (9)

Country Link
EP (3) EP0784415B1 (de)
JP (1) JPH08502635A (de)
AT (1) ATE162038T1 (de)
AU (1) AU682831B2 (de)
CA (1) CA2146969C (de)
DE (3) DE69331913T2 (de)
DK (2) DK0784415T3 (de)
GB (1) GB9222677D0 (de)
WO (1) WO1994010817A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1000880C2 (nl) * 1995-07-24 1997-01-28 Microtronic Nederland Bv Transducer.
NL1000878C2 (nl) * 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 (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
DE202018107123U1 (de) 2017-12-30 2019-01-08 Knowles Electronics, Llc Elektroakustischer Wandler mit verbessertem Stoßschutz
US11659337B1 (en) 2021-12-29 2023-05-23 Knowles Electronics, Llc Balanced armature receiver having improved shock performance

Citations (4)

* 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
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 (3)

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

Patent Citations (4)

* 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
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

Also Published As

Publication number Publication date
CA2146969C (en) 2000-12-26
DK0784415T3 (da) 2002-08-19
EP0924961B1 (de) 2002-03-13
JPH08502635A (ja) 1996-03-19
EP0667093B1 (de) 1998-01-07
ATE162038T1 (de) 1998-01-15
DK0667093T3 (da) 1998-09-07
DE69331717D1 (de) 2002-04-18
DE69331913T2 (de) 2002-11-28
EP0924961A1 (de) 1999-06-23
DE69331913D1 (de) 2002-06-13
EP0667093A1 (de) 1995-08-16
CA2146969A1 (en) 1994-05-11
AU682831B2 (en) 1997-10-23
DE69316233T2 (de) 1998-05-28
DE69316233D1 (de) 1998-02-12
DE69331717T2 (de) 2002-10-31
WO1994010817A1 (en) 1994-05-11
AU5284193A (en) 1994-05-24
GB9222677D0 (en) 1992-12-09
EP0784415B1 (de) 2002-05-08

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