EP0784415B1 - Electroacoustic transducer - Google Patents
Electroacoustic transducer Download PDFInfo
- Publication number
- EP0784415B1 EP0784415B1 EP97103200A EP97103200A EP0784415B1 EP 0784415 B1 EP0784415 B1 EP 0784415B1 EP 97103200 A EP97103200 A EP 97103200A EP 97103200 A EP97103200 A EP 97103200A EP 0784415 B1 EP0784415 B1 EP 0784415B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tunnel
- reed
- coil
- transducer
- armature
- 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
Links
Images
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 GB-A-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.
- coils in such transducers are almost always formerless, 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 transducers and has a number of limitations.
- the invention consists in an electroacoustics 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 armature being mounted for deflection towards or away from the respective magnets, characterised in that the tunnel is defined solely by the windings of the coil and in that at least one part of the cross-section of the tunnel is dimensioned or shaped to restrict movement of the reed armature in a direction orthogonal to its plane.
- the part may thus be narrower than the rest of the tunnel in the direction of reed armature movement or the movement restricting part may be engaged by a part of the reed armature before the tunnel wall would otherwise be engaged by the reed armature.
- the movement restricting part is not reentrant to avoid problems in winding the coil.
- the movement restricting part consists in cut off corners of an otherwise rectangular cross-sectioned tunnel.
- Figures 1-7 illustrate an arrangement claimed in our co-pending European Patent Application No. 93 923 007.4 and figures 8 and 9 are claimed in co-pending European Patent Application No. 99 102 640.2, but are all 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 another approach in which a restriction is introduced either between the magnets 13,14 and the coil 12 or between the magnets 13, 14 and the coil 12 and 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.
- Figures 10 to 12 illustrate embodiments of the invention of the present Application in which the coil 12, which has its tunnel 18 defined purely by its windings, is wound in such a way that at in 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
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 GB-A-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, described in US-A-4 272 654 according to which the preamble of claim 1 has been delimited, 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 transducers are almost always formerless, 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 transducers and has a number of limitations.
- The invention consists in an electroacoustics 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 armature being mounted for deflection towards or away from the respective magnets, characterised in that the tunnel is defined solely by the windings of the coil and in that at least one part of the cross-section of the tunnel is dimensioned or shaped to restrict movement of the reed armature in a direction orthogonal to its plane.
- The part may thus be narrower than the rest of the tunnel in the direction of reed armature movement or the movement restricting part may be engaged by a part of the reed armature before the tunnel wall would otherwise be engaged by the reed armature. Preferably the movement restricting part is not reentrant to avoid problems in winding the coil. For example the movement restricting part consists in cut off corners of an otherwise rectangular cross-sectioned tunnel.
- The invention may be performed in various ways. Specific embodiments will now be described with reference to the accompanying drawings of which Figures 1 to 9 illustrate embodiments leading to the invention but not falling under the scope of protection of the present claims and which are the subject of other Patent Applications, in which:
- Figures 1-7 illustrate an arrangement claimed in our co-pending European Patent Application No. 93 923 007.4 and figures 8 and 9 are claimed in co-pending European Patent Application No. 99 102 640.2, but are all retained so as to illustrate the operation of the subsequent embodiments.
- Figure 1 is a cross sectional stylised view through an electroacoustics 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 of Figures 1 to 3;
- Figure 5 is a cross sectional view of the reed of Figure 4 along the line IV - IV;
- Figures 6 to 9 are schematic views generally corresponding to Figure 1 showing alternative arrangements; and
- Figures 10 to 12 show a number of tunnel cross-sections according to the invention.
-
- An
electroacoustic transducer 10 is schematically shown in Figures 1 to 3. Thetransducer 10 comprises acoil 12,magnets pole pieces reed armature 17. As can be seen in Figure 1 thecoil 12 defines acentral tunnel 18 and themagnets reed armature 17 extends along thetunnel 18 and between themagnets central portion 19 of thereed 17 lies within thetunnel 18 and, adjacent one end of thatcentral portion 19 are formedopposed formations formations - As can be seen in Figures 2 and 3 the
formations coil 12 when the reed is deflected upwardly or downwardly beyond its normal working range. Preferably the formations are sized to prevent thetip 22 of thereed 17 striking themagnets coil 12, before thetip 22 strikes either themagnet 13 ormagnet 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 thereed 17 within thetunnel 18. In a construction where this was not a factor, the formations could be at the sides of thereed 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 these advantages can be obtained with other arrangements and these are briefly described in connection with Figures 6 to 9. - In Figure 6 the
formations formations sleeve 23 slid onto thereed 17. - Figures 8 and 9 show another approach in which a restriction is introduced either between the
magnets coil 12 or between themagnets coil 12 and at the magnet end of thetunnel 18, so that the restriction engages thereed 17 to limit the deflection in a similar manner to that achieved by the formations mentioned above. Thus in Figure 8 aspacer 24 has a restrictedopening 25 whilst in Figure 9 aninsert 26 is pressed into the end of thetunnel 18 or created using settable plastic material. Preferably the restriction so created is confined to the area of the longitudinal axis for the reasons mentioned above. - Figures 10 to 12 illustrate embodiments of the invention of the present Application in which the
coil 12, which has itstunnel 18 defined purely by its windings, is wound in such a way that at in least one part of its cross-section, the tunnel walls are formed to engage thereed 17 in a way which reduces damaging deflections of the reed. - Thus in Figure 10 the
coil 12 is wound withprojections 27 projecting into thetunnel 18; in Figure 11, which is a longitudinal section of thecoil 12, the tunnel has a reduced cross-section at 28 and in Figure 12 the corners of therectangular tunnel 18 are cut off to provide inclined reedengaging surfaces 29. - It will be understood that the restriction principles recited in this description are applicable to many other reed mountings and configurations provided they fall within the scope of protection of the Claims.
Claims (5)
- An electroacoustics transducer (10) including a pair of spaced permanent magnets (13, 14), a coil (12) having a tunnel (18) therethrough and a flat elongate reed armature (17) having a central portion which extends through the coil tunnel (18) and a tip portion (22) which lies at least partially between the magnets (13, 14), the reed armature (17) being mounted for deflection towards or away from the respective magnets (13, 14), characterised in that the tunnel (18) is defined solely by the windings of the coil (12) and in that at least one part (27; 28; 29) of the cross-section of the tunnel (18) is dimensioned or shaped to restrict movement of the reed armature (17) in a direction orthogonal to its plane.
- A transducer as claimed in Claim 1, characterised in that the movement restricting part (27; 28; 29) of the tunnel (18) is narrower than the rest of the tunnel (18) in the direction of the reed armature movement.
- A transducer as claimed in Claim 2, characterised in that the movement restricting part (27; 28; 29) is engaged by a part of the reed armature (17) before the tunnel wall would otherwise be engaged by the reed armature (17).
- A transducer as claimed in Claim 3, characterised in that the movement restricting part (27; 28; 29) is not reentrant.
- A transducer as claimed in Claim 4, characterised in that the movement restricting part (29) consists in cut off corners of an otherwise rectangular cross-section tunnel (18).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99102640A EP0924961B1 (en) | 1992-10-29 | 1993-10-15 | Electroacoustic transducer |
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 (en) | 1992-10-29 | 1993-10-15 | Electroacoustic transducer |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93923007A Division EP0667093B1 (en) | 1992-10-29 | 1993-10-15 | Electroacoustic transducer |
EP93923007.4 Division | 1994-05-11 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99102640A Division EP0924961B1 (en) | 1992-10-29 | 1993-10-15 | Electroacoustic transducer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0784415A1 EP0784415A1 (en) | 1997-07-16 |
EP0784415B1 true EP0784415B1 (en) | 2002-05-08 |
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 |
EP93923007A Expired - Lifetime EP0667093B1 (en) | 1992-10-29 | 1993-10-15 | Electroacoustic transducer |
EP97103200A Expired - Lifetime EP0784415B1 (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 |
EP93923007A Expired - Lifetime EP0667093B1 (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) | DE69331717T2 (en) |
DK (2) | DK0784415T3 (en) |
GB (1) | GB9222677D0 (en) |
WO (1) | WO1994010817A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015057488A1 (en) * | 2013-10-17 | 2015-04-23 | Knowles Electronics, Llc | Shock resistant coil and receiver |
US10945077B2 (en) | 2017-12-30 | 2021-03-09 | Knowles Electronics, Llc | Electroacoustic transducer with improved shock protection |
US11659337B1 (en) | 2021-12-29 | 2023-05-23 | Knowles Electronics, Llc | Balanced armature receiver having improved shock performance |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1000878C2 (en) * | 1995-07-24 | 1997-01-28 | Microtronic Nederland Bv | Transducer. |
NL1000880C2 (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 |
Citations (1)
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 |
Family Cites Families (6)
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 |
-
1992
- 1992-10-29 GB GB929222677A patent/GB9222677D0/en active Pending
-
1993
- 1993-10-15 DE DE69331717T patent/DE69331717T2/en not_active Expired - Lifetime
- 1993-10-15 DK DK97103200T patent/DK0784415T3/en active
- 1993-10-15 WO PCT/GB1993/002140 patent/WO1994010817A1/en active IP Right Grant
- 1993-10-15 EP EP99102640A patent/EP0924961B1/en not_active Expired - Lifetime
- 1993-10-15 AU AU52841/93A patent/AU682831B2/en not_active Ceased
- 1993-10-15 AT AT93923007T patent/ATE162038T1/en not_active IP Right Cessation
- 1993-10-15 EP EP93923007A patent/EP0667093B1/en not_active Expired - Lifetime
- 1993-10-15 JP JP6510796A patent/JPH08502635A/en active Pending
- 1993-10-15 DK DK93923007T patent/DK0667093T3/en active
- 1993-10-15 CA CA002146969A patent/CA2146969C/en not_active Expired - Fee Related
- 1993-10-15 DE DE69331913T patent/DE69331913T2/en not_active Expired - Lifetime
- 1993-10-15 DE DE69316233T patent/DE69316233T2/en not_active Expired - Fee Related
- 1993-10-15 EP EP97103200A patent/EP0784415B1/en not_active Expired - Lifetime
Patent Citations (1)
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 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015057488A1 (en) * | 2013-10-17 | 2015-04-23 | Knowles Electronics, Llc | Shock resistant coil and receiver |
US9485585B2 (en) | 2013-10-17 | 2016-11-01 | Knowles Electronics, Llc | Shock resistant coil and receiver |
US10945077B2 (en) | 2017-12-30 | 2021-03-09 | Knowles Electronics, Llc | Electroacoustic transducer with improved shock protection |
US11659337B1 (en) | 2021-12-29 | 2023-05-23 | Knowles Electronics, Llc | Balanced armature receiver having improved shock performance |
Also Published As
Publication number | Publication date |
---|---|
WO1994010817A1 (en) | 1994-05-11 |
DE69316233D1 (en) | 1998-02-12 |
DK0784415T3 (en) | 2002-08-19 |
DK0667093T3 (en) | 1998-09-07 |
EP0784415A1 (en) | 1997-07-16 |
EP0667093A1 (en) | 1995-08-16 |
JPH08502635A (en) | 1996-03-19 |
ATE162038T1 (en) | 1998-01-15 |
CA2146969C (en) | 2000-12-26 |
GB9222677D0 (en) | 1992-12-09 |
DE69316233T2 (en) | 1998-05-28 |
EP0667093B1 (en) | 1998-01-07 |
DE69331717T2 (en) | 2002-10-31 |
EP0924961B1 (en) | 2002-03-13 |
EP0924961A1 (en) | 1999-06-23 |
CA2146969A1 (en) | 1994-05-11 |
DE69331717D1 (en) | 2002-04-18 |
DE69331913T2 (en) | 2002-11-28 |
AU682831B2 (en) | 1997-10-23 |
AU5284193A (en) | 1994-05-24 |
DE69331913D1 (en) | 2002-06-13 |
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