CA1160732A - Securing of lead wires to electro-acoustic transducers - Google Patents
Securing of lead wires to electro-acoustic transducersInfo
- Publication number
- CA1160732A CA1160732A CA000367435A CA367435A CA1160732A CA 1160732 A CA1160732 A CA 1160732A CA 000367435 A CA000367435 A CA 000367435A CA 367435 A CA367435 A CA 367435A CA 1160732 A CA1160732 A CA 1160732A
- Authority
- CA
- Canada
- Prior art keywords
- diaphragm
- lead wires
- adhesive
- voice coil
- electro
- 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
Links
- 239000000853 adhesive Substances 0.000 claims abstract description 48
- 230000001070 adhesive effect Effects 0.000 claims abstract description 48
- 230000002093 peripheral effect Effects 0.000 claims description 14
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 5
- 235000019589 hardness Nutrition 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- YACLQRRMGMJLJV-UHFFFAOYSA-N chloroprene Chemical compound ClC(=C)C=C YACLQRRMGMJLJV-UHFFFAOYSA-N 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/06—Arranging circuit leads; Relieving strain on circuit leads
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
- H04R9/045—Mounting
Abstract
ABSTRACT OF THE DISCLOSURE
An electro-acoustic transducer of dynamic type, particularly a small loudspeaker or microphone, such as a loudspeaker for use in headphones, comprises a magnetic circuit including an air gap, a diaphragm having a voice coil disposed in the air gap, and lead wires for the voice coil, the lead wires extending substantially tangentially from the voice coil and being bonded to the diaphragm by two different kinds of adhesive, a relatively hard adhesive being used near the voice coil and a relatively soft adhesive being used near the periphery of the diaphragm.
An electro-acoustic transducer of dynamic type, particularly a small loudspeaker or microphone, such as a loudspeaker for use in headphones, comprises a magnetic circuit including an air gap, a diaphragm having a voice coil disposed in the air gap, and lead wires for the voice coil, the lead wires extending substantially tangentially from the voice coil and being bonded to the diaphragm by two different kinds of adhesive, a relatively hard adhesive being used near the voice coil and a relatively soft adhesive being used near the periphery of the diaphragm.
Description
Fleld of the Invention This invention relatea to electro-acoustic transducers, and more particularly, but not exclusively, to relatively small loudspeakers for use in headphones. The invention is also applicable to loudspeakers of other sizes 15 and for other purposes, and also to microphones.
Description of the Prior Art Generally, a relatively small e;ectro-acoustic transducer such as a Ioudspeaker for use in headphones includes a magnetic circuit and a diaphragm which comprises a dome-shaped central portion and a ring-shaped 20 peripheral portion to be fixed to a frame. A voice coil is fixed to the diaphragm where the central and peripheral portions of the diaphragm meet, and is disposed in an air gap formed in the magnetic circuit.
Lead wires for the voice coil extend radially along the undersurface of the peripheral portion of the diaphragm and are bonded thereto by a 25 suitable adhesive. Beyond the adhesive, unsupported portions of the lead wires are bent at right angles at or near the periphery of the diaphragm in order to be connected to terminals provided on an outside surface of the frame.
When the diaphragm vibrates with large amplitude, it is not 30 uncommon for the lead wires to snap. This i8 because the portions of the
Description of the Prior Art Generally, a relatively small e;ectro-acoustic transducer such as a Ioudspeaker for use in headphones includes a magnetic circuit and a diaphragm which comprises a dome-shaped central portion and a ring-shaped 20 peripheral portion to be fixed to a frame. A voice coil is fixed to the diaphragm where the central and peripheral portions of the diaphragm meet, and is disposed in an air gap formed in the magnetic circuit.
Lead wires for the voice coil extend radially along the undersurface of the peripheral portion of the diaphragm and are bonded thereto by a 25 suitable adhesive. Beyond the adhesive, unsupported portions of the lead wires are bent at right angles at or near the periphery of the diaphragm in order to be connected to terminals provided on an outside surface of the frame.
When the diaphragm vibrates with large amplitude, it is not 30 uncommon for the lead wires to snap. This i8 because the portions of the
2 3 . .
' 116073Z
lead wires fixed to the peripheral portion o~ the diaphragm move together with the diaphragm, but the bent portions of the lead wires are not supported and moreover are bent at right angles, so that after a time the wire suffers from metal fatigue and may become brittle and snap. The radial dispDsition of the lead wires also causes problems as they contact the peripheral portion of the diaphragm when the diaphragm vibrates with Jarge amplitude, and this generates a noise.
SUMMARY OF THE INVENTION
One object of the present invention is to provide an improved electro-acoustic transducer.
Another object of the present invention is to provide an electro-acoustic transducer such as a dynamic loudspeaker in which the risk of snapping of the lead wires of the voice coil is reduced.
Another object of the present invention is to provide an electro-acoustic transducer which has relatively long lead wires for the voice coil.
Another object of the present invention is to provide an electro-acoustic transducer such as a small-sized dynamic loudspeaker, in which the lead wires for the voice coil are bonded by two kinds of adhesive, to reduce the risk of the lead wires snapping.
Another object of the present invention is to provide an electro-acoustic transducer which generates a clear sound.
Another object of the present invention is to provide an electro-acoustic transducer which can easily be constructed and assembled.
According to the present invention there is provided an electro-acoustic transducer comprising:
a mounting member;
a magnetic circuit secured to said mounting member and having an air-gap;
a diaphragm hav~ng an edge port~on secured to sa~d mounting mem~er;
and a cylindrical vcice coil secured to said diaphragm and extending into said air gap of said magnetic circuit, said voice coil having lead wires which extend from said voice coil in a substantially tangential direction towards the periphery of said diaphragm, said lead wires being bonded to said diaphragm by adhesive.
According to the present invention there is also provided an electro-acoustic transducer comprising:
a mounting member;
a magnetic circuit secured to said mounting member and having an air gap;
a diaphragm having an edge portion fixed to said mounting member;
a cylindrical voice coil mounted on said diaphragm and extending into said air gap of said magnetic circuit;
lead wires extending from said voice coil in the direction of the edge portion of said diaphragm along the surface of said diaphragm; and adhesives of two different hardnesses bonding said lead wires to said diaphragm, a relatively hard adhesive being used for the portions of said lead wires nearer said voice coil and a relatively soft adhesive being used for portions of said lead wires nearer the edge portion of said diaphragm.
The above, and other objects, features and advantages of this invention will be apparent from the following detailed description of illustrative embodiments which is to be read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows a cross-sectional view of an embodiment of electro-acoustic transducer according to the invention;
Figure 2 shows a bottom plan view and in particular a voice coil and lead wires of the transducer of Figure 1;
Figure 3 shows another bottom plan view of the transducer of Figure 1; and Figure 4 shows a bottom plan view of another embodiment of electro-acoustic transducer according to the invention.
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DESCRIPTION OF THE PREFERRED EMBODIMENTS
_ The embodiments to be described are small-sized electro-acoustic transducers forming loudspeakers suitable for use in headphones.
The transducer of Figure 1, tn which reference is now made, 5 comprises a small-sized diaphragm 20 formed by a film of plastics material, a magnetic circuit 26 and a mounting member formed by a moulded frame 22 of plastics material to which the magnetic circuit 26 and the diaphragm 2û are secured. The diaphragm 20 comprises a dome-shaped central portion 20a and a ring-shaped peripheral portion Z0b contiguous to the central 10 portion 20a, an edge portion 20c of the peripheral portion 20b being fixed to the frame 22 through a suitable ring 24.
The magnetic circuit 26 comprises a circular plate 28, a permanent magnet 30 and a yoke 32, an air gap 34 being formed between the plate 28 and the yoke 32. A cylindrical voice coil 36 is secured to the boundary 15 region between the central portion 20a and the peripheral portion 20b of the diaphragm 20 by a suitable adhesive, and is disposed so as to extend into the air gap 34. The voice coil 36 does not have a bobbin.
As also seen in Figure 2, lead wires 38 for the voice coil 36 have tangential portions 38a which extend substantially tangentially from the 20 voice coil 36 and which then merge into circular arc portions 38b which extend along the peripheral portion 20b of the diaphragm 20 close to the ring 24. The circular arc portions 38b then bend away from the diaphragm 20 as shown in Figure 1, to extend through an opening 40 formed in the frame 22 and are connected to terminals 47 and 48 which are mounted on an 25 insulating plate 42 mounted on the outer surface of the frame 22 as also seen in Figure 3.
With this embodiment, the tangential portions 38a of the lead wires 38 are bonded to the undersurface of the diaphragm 20 by an adhesive 44 which is relatively hard. The adhesive 44 may for example be a rubber 30 system adhesive, such as a solvent type of chloroprene, for example ~6073Z
DB-4378, this being a Trade Name of r~B Bond Corporation. The circular arc portions 38b of the lead wires 38 are bonded to the diaphragm 20 by an adhesive 46 which is relatively soft. This may for example be an acrylic system adhesive, for example, SC-717, this being a Trade Name oF Sony 5 Chemical Corporation. Moreover, the lead wires 38 are located in the opening 40 by an adhesive 48 which may be the same acrylic system adhesive just mentioned. Finally, the end portions of the lead wires 38 nearest to the terminals 47 and 48 may be bonded by an epoxy system adhesive 50.
Thus in this embodiment the lead wires 38 of the voice coil 36 are bonded to the diaphragm 20 by two different kinds of adhesive, having different hardnesses, the relatively hard adhesive being nearer the voice coil 36 and the relatively soft adhesive being nearer the edge portion 20c of the diaphragm 20. This means that the portions nf the lead wires 38 nearer to 15 the voice coil 36, that is the tangential portions 38a vibrate together with the voice coil 36 as one body. However, the circular arc portions 38b of the lead wires 38, that is the portions near the edge portion 2ûc of the diaphragm 20 vibrate with the voice coil 36 as one body when the voice coil 36 vibrates with only a comparatively small amplitude, but if the voice coil 20 36 vibrates with a relatively large amplitude, the circular arc portions 38b of the lead wires 38 are able to move relative to the adhesive 46, due to the softness of the adhesive 46. The same effect tends to occur if a large external force is applied to the peripheral portion 20b of the diaphragm 20.
This means that in such cases the forces applied to the lead wires 38 tend to 25 be absorbed in the adhesives, particularly the adhesive 46, and this reduces forces acting in particular on the bent portions 38c of the lead wires 38, and reduces the tendency for the lead wires 38 to snap.
In the nnodified embodiment shown in Figure 4, to which reference is now made, lead wires 38 extend substantialiy tangentially from a voice coil 30 36, but forrn a circular arc and so take a relatively long path between the r J~ 3 Z
i voice coil 36 and the outer edge of the peripheral portion 20b of the diaphragm 20. Portions of the lead wires 38 nearer the voice coil 36 are bonded to the diaphragm 20 by a relatively hard adhesive 44 such as a rubber system adhesive, and portions of the lead wires 38 further from the voice 5 coil 36 and nearer to the outer edge of the peripheral portion 20b of the diaphragm 20 are bonded to the diaphragm 20 by a relatively hard adhesive 46, such as an acrylic system adhesive. As in the first embodiment described above, therefore, the tendency for the lead wires 38 to be subjected to excessive forces and hence to snap is reduced.
Thus in embodiments of the invention the lead wires of a voice coil extend from the voice coil to a peripheral portion of the diaphragm along a circular arc, so as to take a long path relative to the radial path used in the prior art. This reduces the forces acting on the lead wires and reduces the possibility of the lead wires snapping. Also, two different kinds of adhesive 15 of different hardnesses may be used for securing the lead wires, and this also contributes to reducing the risk of the lead wires snapping. This is particularly effective where the lead wires extend along the periphery of the diaphragm and are secured by a relatively soft adhesive, as described with reference to Figure 2. Moreover, the provision of a relatively soft 20 adhesive, such as an acrylic system adhesive, has a damping effect on the lead wires and reduces the possibility of unwanted noise being generated by contact between the lead wires and the diaphragm.
Although the embodiments described are small-sized ioudspeakers, the invention can also be applied to loudspeakers of other sizes and also to 25 microphones of dynamic type.
Although illustrative embodiments of the invention have been described in detail herein with reference to the accompanying drawings, it is to be understood that the invention is not limited to those precise embodiments, and that various changes and modifications can be effected 30 therein by one skilled in the art without departing from the scope and spirit of the invention as defined by the appended claims.
' 116073Z
lead wires fixed to the peripheral portion o~ the diaphragm move together with the diaphragm, but the bent portions of the lead wires are not supported and moreover are bent at right angles, so that after a time the wire suffers from metal fatigue and may become brittle and snap. The radial dispDsition of the lead wires also causes problems as they contact the peripheral portion of the diaphragm when the diaphragm vibrates with Jarge amplitude, and this generates a noise.
SUMMARY OF THE INVENTION
One object of the present invention is to provide an improved electro-acoustic transducer.
Another object of the present invention is to provide an electro-acoustic transducer such as a dynamic loudspeaker in which the risk of snapping of the lead wires of the voice coil is reduced.
Another object of the present invention is to provide an electro-acoustic transducer which has relatively long lead wires for the voice coil.
Another object of the present invention is to provide an electro-acoustic transducer such as a small-sized dynamic loudspeaker, in which the lead wires for the voice coil are bonded by two kinds of adhesive, to reduce the risk of the lead wires snapping.
Another object of the present invention is to provide an electro-acoustic transducer which generates a clear sound.
Another object of the present invention is to provide an electro-acoustic transducer which can easily be constructed and assembled.
According to the present invention there is provided an electro-acoustic transducer comprising:
a mounting member;
a magnetic circuit secured to said mounting member and having an air-gap;
a diaphragm hav~ng an edge port~on secured to sa~d mounting mem~er;
and a cylindrical vcice coil secured to said diaphragm and extending into said air gap of said magnetic circuit, said voice coil having lead wires which extend from said voice coil in a substantially tangential direction towards the periphery of said diaphragm, said lead wires being bonded to said diaphragm by adhesive.
According to the present invention there is also provided an electro-acoustic transducer comprising:
a mounting member;
a magnetic circuit secured to said mounting member and having an air gap;
a diaphragm having an edge portion fixed to said mounting member;
a cylindrical voice coil mounted on said diaphragm and extending into said air gap of said magnetic circuit;
lead wires extending from said voice coil in the direction of the edge portion of said diaphragm along the surface of said diaphragm; and adhesives of two different hardnesses bonding said lead wires to said diaphragm, a relatively hard adhesive being used for the portions of said lead wires nearer said voice coil and a relatively soft adhesive being used for portions of said lead wires nearer the edge portion of said diaphragm.
The above, and other objects, features and advantages of this invention will be apparent from the following detailed description of illustrative embodiments which is to be read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows a cross-sectional view of an embodiment of electro-acoustic transducer according to the invention;
Figure 2 shows a bottom plan view and in particular a voice coil and lead wires of the transducer of Figure 1;
Figure 3 shows another bottom plan view of the transducer of Figure 1; and Figure 4 shows a bottom plan view of another embodiment of electro-acoustic transducer according to the invention.
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DESCRIPTION OF THE PREFERRED EMBODIMENTS
_ The embodiments to be described are small-sized electro-acoustic transducers forming loudspeakers suitable for use in headphones.
The transducer of Figure 1, tn which reference is now made, 5 comprises a small-sized diaphragm 20 formed by a film of plastics material, a magnetic circuit 26 and a mounting member formed by a moulded frame 22 of plastics material to which the magnetic circuit 26 and the diaphragm 2û are secured. The diaphragm 20 comprises a dome-shaped central portion 20a and a ring-shaped peripheral portion Z0b contiguous to the central 10 portion 20a, an edge portion 20c of the peripheral portion 20b being fixed to the frame 22 through a suitable ring 24.
The magnetic circuit 26 comprises a circular plate 28, a permanent magnet 30 and a yoke 32, an air gap 34 being formed between the plate 28 and the yoke 32. A cylindrical voice coil 36 is secured to the boundary 15 region between the central portion 20a and the peripheral portion 20b of the diaphragm 20 by a suitable adhesive, and is disposed so as to extend into the air gap 34. The voice coil 36 does not have a bobbin.
As also seen in Figure 2, lead wires 38 for the voice coil 36 have tangential portions 38a which extend substantially tangentially from the 20 voice coil 36 and which then merge into circular arc portions 38b which extend along the peripheral portion 20b of the diaphragm 20 close to the ring 24. The circular arc portions 38b then bend away from the diaphragm 20 as shown in Figure 1, to extend through an opening 40 formed in the frame 22 and are connected to terminals 47 and 48 which are mounted on an 25 insulating plate 42 mounted on the outer surface of the frame 22 as also seen in Figure 3.
With this embodiment, the tangential portions 38a of the lead wires 38 are bonded to the undersurface of the diaphragm 20 by an adhesive 44 which is relatively hard. The adhesive 44 may for example be a rubber 30 system adhesive, such as a solvent type of chloroprene, for example ~6073Z
DB-4378, this being a Trade Name of r~B Bond Corporation. The circular arc portions 38b of the lead wires 38 are bonded to the diaphragm 20 by an adhesive 46 which is relatively soft. This may for example be an acrylic system adhesive, for example, SC-717, this being a Trade Name oF Sony 5 Chemical Corporation. Moreover, the lead wires 38 are located in the opening 40 by an adhesive 48 which may be the same acrylic system adhesive just mentioned. Finally, the end portions of the lead wires 38 nearest to the terminals 47 and 48 may be bonded by an epoxy system adhesive 50.
Thus in this embodiment the lead wires 38 of the voice coil 36 are bonded to the diaphragm 20 by two different kinds of adhesive, having different hardnesses, the relatively hard adhesive being nearer the voice coil 36 and the relatively soft adhesive being nearer the edge portion 20c of the diaphragm 20. This means that the portions nf the lead wires 38 nearer to 15 the voice coil 36, that is the tangential portions 38a vibrate together with the voice coil 36 as one body. However, the circular arc portions 38b of the lead wires 38, that is the portions near the edge portion 2ûc of the diaphragm 20 vibrate with the voice coil 36 as one body when the voice coil 36 vibrates with only a comparatively small amplitude, but if the voice coil 20 36 vibrates with a relatively large amplitude, the circular arc portions 38b of the lead wires 38 are able to move relative to the adhesive 46, due to the softness of the adhesive 46. The same effect tends to occur if a large external force is applied to the peripheral portion 20b of the diaphragm 20.
This means that in such cases the forces applied to the lead wires 38 tend to 25 be absorbed in the adhesives, particularly the adhesive 46, and this reduces forces acting in particular on the bent portions 38c of the lead wires 38, and reduces the tendency for the lead wires 38 to snap.
In the nnodified embodiment shown in Figure 4, to which reference is now made, lead wires 38 extend substantialiy tangentially from a voice coil 30 36, but forrn a circular arc and so take a relatively long path between the r J~ 3 Z
i voice coil 36 and the outer edge of the peripheral portion 20b of the diaphragm 20. Portions of the lead wires 38 nearer the voice coil 36 are bonded to the diaphragm 20 by a relatively hard adhesive 44 such as a rubber system adhesive, and portions of the lead wires 38 further from the voice 5 coil 36 and nearer to the outer edge of the peripheral portion 20b of the diaphragm 20 are bonded to the diaphragm 20 by a relatively hard adhesive 46, such as an acrylic system adhesive. As in the first embodiment described above, therefore, the tendency for the lead wires 38 to be subjected to excessive forces and hence to snap is reduced.
Thus in embodiments of the invention the lead wires of a voice coil extend from the voice coil to a peripheral portion of the diaphragm along a circular arc, so as to take a long path relative to the radial path used in the prior art. This reduces the forces acting on the lead wires and reduces the possibility of the lead wires snapping. Also, two different kinds of adhesive 15 of different hardnesses may be used for securing the lead wires, and this also contributes to reducing the risk of the lead wires snapping. This is particularly effective where the lead wires extend along the periphery of the diaphragm and are secured by a relatively soft adhesive, as described with reference to Figure 2. Moreover, the provision of a relatively soft 20 adhesive, such as an acrylic system adhesive, has a damping effect on the lead wires and reduces the possibility of unwanted noise being generated by contact between the lead wires and the diaphragm.
Although the embodiments described are small-sized ioudspeakers, the invention can also be applied to loudspeakers of other sizes and also to 25 microphones of dynamic type.
Although illustrative embodiments of the invention have been described in detail herein with reference to the accompanying drawings, it is to be understood that the invention is not limited to those precise embodiments, and that various changes and modifications can be effected 30 therein by one skilled in the art without departing from the scope and spirit of the invention as defined by the appended claims.
Claims (8)
1. An electro-acoustic transducer comprising:
a mounting member;
a magnetic circuit secured to said mounting member and having an air-gap;
a-diaphragm having an edge portion secured to said mounting member;
and a cylindrical voice coil secured to said diaphragm and extending into said air gap of said magnetic circuit, said voice coil having lead wires which extend from said voice coil in a substantially tangential direction towards the periphery of said diaphragm, said lead wires being bonded to said diaphragm by adhesive.
a mounting member;
a magnetic circuit secured to said mounting member and having an air-gap;
a-diaphragm having an edge portion secured to said mounting member;
and a cylindrical voice coil secured to said diaphragm and extending into said air gap of said magnetic circuit, said voice coil having lead wires which extend from said voice coil in a substantially tangential direction towards the periphery of said diaphragm, said lead wires being bonded to said diaphragm by adhesive.
2. An electro-acoustic transducer according to claim 1 wherein said lead wires have circular arc portions extending along a peripheral portion of said diaphragm, said circular arc portions being bonded to said diaphragm by adhesive.
3. An electro-acoustic transducer according to claim 1 wherein said adhesive comprises adhesives of two different hardnesses, a relatively hard adhesive being used for the portions of the lead wires nearer said voice coil, and a relatively soft adhesive being used for portions of said lead wires nearer the periphery of said diaphragm.
4. An electro-acoustic transducer according to claim 3 wherein said relatively hard adhesive is a rubber system adhesive and said relatively soft adhesive is an acrylic system adhesive.
5. An electro-acoustic transducer according to claim 3 further comprising terminals to which said lead wires are connected, said lead wires extending from said diaphragm towards said terminals by way of bent portions of said lead wires which are coated with a relatively soft adhesive.
6. An electro-acoustic transducer comprising:
a mounting member;
a magnetic circuit secured to said mounting member and having an air gap;
a diaphragm having an edge portion fixed to said mounting member;
a cylindrical voice coil mounted on said diaphragm and extending into said air gap of said magnetic circuit;
lead wires extending from said voice coil in the direction of the edge portion of said diaphragm along the surface of said diaphragm; and adhesives of two different hardnesses bonding said lead wires to said diaphragm, a relatively hard adhesive being used for the portions of said lead wires nearer said voice coil and a relatively soft adhesive being used for portions of said lead wires nearer the edge portion of said diaphragm.
a mounting member;
a magnetic circuit secured to said mounting member and having an air gap;
a diaphragm having an edge portion fixed to said mounting member;
a cylindrical voice coil mounted on said diaphragm and extending into said air gap of said magnetic circuit;
lead wires extending from said voice coil in the direction of the edge portion of said diaphragm along the surface of said diaphragm; and adhesives of two different hardnesses bonding said lead wires to said diaphragm, a relatively hard adhesive being used for the portions of said lead wires nearer said voice coil and a relatively soft adhesive being used for portions of said lead wires nearer the edge portion of said diaphragm.
7. An electro-acoustic transducer according to claim 6 wherein said lead wires extend substantially tangentially from said voice coil.
8. An electro-acoustic transducer according to claim 7 wherein said lead wires include circular arc portions extending along part of the periphery of said diaphragm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54172668A JPS6028200B2 (en) | 1979-12-31 | 1979-12-31 | electroacoustic transducer |
| JP172668/79 | 1979-12-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1160732A true CA1160732A (en) | 1984-01-17 |
Family
ID=15946149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000367435A Expired CA1160732A (en) | 1979-12-31 | 1980-12-23 | Securing of lead wires to electro-acoustic transducers |
Country Status (11)
| Country | Link |
|---|---|
| JP (1) | JPS6028200B2 (en) |
| AT (1) | AT369940B (en) |
| AU (1) | AU540983B2 (en) |
| BR (1) | BR8008627A (en) |
| CA (1) | CA1160732A (en) |
| DE (1) | DE3048779A1 (en) |
| ES (1) | ES8204902A1 (en) |
| FR (1) | FR2472899B1 (en) |
| GB (2) | GB2076257B (en) |
| IT (1) | IT1146224B (en) |
| NL (1) | NL191225C (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58173998U (en) * | 1982-05-14 | 1983-11-21 | シャープ株式会社 | electrodynamic speaker |
| JPS5920797U (en) * | 1982-07-26 | 1984-02-08 | シャープ株式会社 | electrodynamic speaker |
| JPS62121900U (en) * | 1986-01-24 | 1987-08-03 | ||
| JP2674777B2 (en) * | 1988-04-15 | 1997-11-12 | 松下電工株式会社 | Scanner for light beam scanning |
| NO169210C (en) * | 1989-07-06 | 1992-05-20 | Nha As | ELECTRODYNAMIC AUDIO FOR HEARING DEVICE. |
| DE4243308C2 (en) * | 1992-12-21 | 1996-08-22 | Sennheiser Electronic | Dynamic electro-acoustic transducer, especially headphones |
| DE4434630A1 (en) * | 1994-09-28 | 1996-04-04 | Nokia Deutschland Gmbh | UV adhesive for fixing coated wires in a moving coil of loudspeaker |
| DE19630169A1 (en) * | 1996-07-26 | 1998-01-29 | Nokia Deutschland Gmbh | Voice coil contact arrangement |
| EP1438872B1 (en) * | 2001-10-04 | 2011-01-19 | Nxp B.V. | Electroacoustic transducer having a moving coil and having movable holding elements for the connecting leads of the moving coil |
| JP4159408B2 (en) | 2003-05-26 | 2008-10-01 | パイオニア株式会社 | Speaker |
| ITBO20110356A1 (en) | 2011-06-21 | 2012-12-22 | Gd Spa | WHEELING UNIT OF A WRAPPING MATERIAL TAPE |
| DE102015201940A1 (en) * | 2015-02-04 | 2016-08-04 | Sennheiser Electronic Gmbh & Co. Kg | Electrodynamic transducer |
| JP2019161542A (en) * | 2018-03-15 | 2019-09-19 | オンキヨー株式会社 | Diaphragm, speaker unit including the same, headphone, earphone, and method of manufacturing diaphragm |
| WO2020183865A1 (en) * | 2019-03-13 | 2020-09-17 | アンデン株式会社 | Sound generator |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB776280A (en) * | 1954-05-26 | 1957-06-05 | Cole E K Ltd | Improvements in or relating to moving coil loudspeakers and microphones |
| US3032615A (en) * | 1960-02-02 | 1962-05-01 | Rca Corp | Acoustic devices |
| US3284581A (en) * | 1963-06-03 | 1966-11-08 | Columbia Broadcasting Syst Inc | Loud speaker construction |
| DE1907850U (en) * | 1964-06-05 | 1965-01-07 | Blaupunkt Werke Gmbh | LOUDSPEAKER WITH LEADS TO A VOICE COIL. |
| NL6712007A (en) * | 1967-08-31 | 1969-03-04 | ||
| AU414741B2 (en) * | 1968-06-26 | 1971-07-09 | Girling Limited | Improvements in vehicle braking systems |
| DE1951162A1 (en) * | 1969-10-10 | 1971-04-22 | Witt Horst C | Work platform for the construction of chimneys or the like. |
-
1979
- 1979-12-31 JP JP54172668A patent/JPS6028200B2/en not_active Expired
-
1980
- 1980-12-18 GB GB8118364A patent/GB2076257B/en not_active Expired
- 1980-12-18 GB GB8040668A patent/GB2067378B/en not_active Expired
- 1980-12-18 AU AU65526/80A patent/AU540983B2/en not_active Ceased
- 1980-12-22 NL NL8006984A patent/NL191225C/en not_active IP Right Cessation
- 1980-12-23 CA CA000367435A patent/CA1160732A/en not_active Expired
- 1980-12-23 DE DE19803048779 patent/DE3048779A1/en active Granted
- 1980-12-23 AT AT0630380A patent/AT369940B/en not_active IP Right Cessation
- 1980-12-23 FR FR8027358A patent/FR2472899B1/en not_active Expired
- 1980-12-29 IT IT50471/80A patent/IT1146224B/en active
- 1980-12-30 ES ES498231A patent/ES8204902A1/en not_active Expired
- 1980-12-30 BR BR8008627A patent/BR8008627A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5698097A (en) | 1981-08-07 |
| AU6552680A (en) | 1981-07-09 |
| FR2472899B1 (en) | 1985-09-13 |
| ES498231A0 (en) | 1982-05-01 |
| BR8008627A (en) | 1981-07-28 |
| AT369940B (en) | 1983-02-10 |
| NL8006984A (en) | 1981-08-03 |
| ATA630380A (en) | 1982-06-15 |
| GB2076257B (en) | 1983-11-30 |
| JPS6028200B2 (en) | 1985-07-03 |
| NL191225B (en) | 1994-10-17 |
| FR2472899A1 (en) | 1981-07-03 |
| IT1146224B (en) | 1986-11-12 |
| GB2067378B (en) | 1983-12-21 |
| GB2067378A (en) | 1981-07-22 |
| DE3048779A1 (en) | 1981-09-17 |
| IT8050471A0 (en) | 1980-12-29 |
| GB2076257A (en) | 1981-11-25 |
| NL191225C (en) | 1995-03-16 |
| AU540983B2 (en) | 1984-12-13 |
| ES8204902A1 (en) | 1982-05-01 |
| DE3048779C2 (en) | 1989-01-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |