JP2003264890A - Diaphragm for speaker and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diaphragm for speaker the voice coil of which is hardly exfoliated. <P>SOLUTION: The digital signal for speaker comprises: a digital signal 4; the voice coil 16 provided to an annular recessed fitting part 4a on the back side of the diaphragm 4; and an outer circumferential support ring 15 provided at an outer circumferential part 4c of the diaphragm 4, and the thickness of the diaphragm at the annular recessed fitting part 4a is selected thicker than the thickness of the diaphragm at the outer circumferential part 4c. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker diaphragm used in various audio equipment, communication equipment and the like, and a method for manufacturing the same.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS. FIG. 6 is a sectional view of the speaker, and FIG. 7 is a sectional view showing a manufacturing process of the speaker diaphragm.

A magnet 11 is provided at the center of the bottom surface of a yoke 10 made of a magnetic material, and a plate 12 is provided thereon. A frame 13 is formed by integrally molding the yoke 10 with resin. The speaker diaphragm 14 is made of a thermoplastic resin such as polyether nitrile, polyethylene terephthalate, or polyether imide. An outer circumference holding ring 15 is provided around the diaphragm 14, and the diaphragm 14 is provided around the diaphragm 14.
The upper end of the voice coil 16 is adhesively bonded to the back surface of each. The voice coil 16 is the plate 12
It is fitted in the magnetic gap between the yoke 10 and the yoke 10. The protector 17 having a small hole is the diaphragm 1.
It is provided so as to cover 4.

As a method of manufacturing the diaphragm 14 for the speaker, first, a sheet of thermoplastic resin (not shown) is used as shown in FIG.
Are heated and pressed by the male and female molding dies 21 and 22 to form the speaker diaphragm 14 as an individual piece, and then the voice coil 16 and the outer peripheral holding ring 15 are adhesively bonded to each other to form a vibration system unit. Then, after that, a speaker is manufactured by adhering and fixing to a frame 13 in which a magnetic circuit formed by the plate 12, the yoke 10 and the magnet 11 is integrated.

[0005]

According to this manufacturing method, when the speaker diaphragm 14 is formed, the force for stretching the thermoplastic resin is likely to be applied to the diaphragm center portion 18 and the diaphragm adhering portion 19. The thickness of the diaphragm of the part becomes thin. In particular, when the thickness of the diaphragm bonding portion 19 that requires rigidity is small, the bonding strength with the voice coil is reduced, and as a result,
There was a problem that the voice coil was easily peeled off.

Therefore, an object of the present invention is to provide a speaker diaphragm in which the voice coil is not easily peeled off.

[0007]

In order to achieve this object, the invention according to claim 1 of the present invention is particularly characterized in that the diaphragm thickness of the annular concave fitting portion is thicker than the diaphragm thickness of the outer peripheral portion. A characteristic of the diaphragm for a speaker. By increasing the thickness of the diaphragm in the annular recessed portion that joins the voice coil, it is possible to improve the bonding strength with the voice coil. This has the effect of making it difficult.

According to a second aspect of the present invention, a resin diaphragm formed by electrodeposition, a voice coil provided in an annular concave fitting portion on the back surface of the diaphragm, and an outer peripheral portion of the diaphragm. A diaphragm for a speaker, which comprises an outer circumference retaining ring provided and a coating film provided by electrodeposition so as to cover at least the voice coil and the lead wire, and an electric diaphragm so as to cover at least the voice coil and the lead wire. By providing the coating film by wearing, the bonding strength with the voice coil can be improved, and as a result, the voice coil is less likely to be peeled off.

In addition, by providing a coating film on the lead wire, it is possible to suppress the generation of abnormal noise and disconnection.

The invention according to claim 3 is the speaker diaphragm according to claim 2, wherein the resin material of the diaphragm and the material of the coating film are different, and in addition to the same function as in claim 2, a different material is used. By superposing with the use of, the range and the thickness are appropriately selected, and it is possible to easily set the characteristics such as the rigidity and the internal loss of the speaker diaphragm easily.

According to a fourth aspect of the present invention, a releasing agent forming step of forming a releasing agent layer on the surface of a conductive metal mold, and an electrodeposition resin film is formed on the surface of the releasing agent layer by electrodeposition. A method for manufacturing a speaker diaphragm, which comprises an electrodeposition step and a peeling step of peeling the electrodeposition resin film, and in particular, electrodeposition is performed on the surface of the release agent layer by electrodeposition using a conductive metal mold. By forming a resin film, it is possible to obtain a speaker diaphragm having a desired thickness by controlling the current density flowing in the metal mold in relation to the counter electrode.

In particular, by increasing the thickness of the diaphragm of the annular concave fitting portion for joining the voice coil, the joining strength with the voice coil can be improved.

According to a fifth aspect of the present invention, an outer peripheral holding ring is provided on the outer peripheral portion of the diaphragm in a primary process after the electrodeposition step,
The speaker diaphragm manufacturing method according to claim 4, further comprising a bonding step of bonding the voice coil to the annular recessed portion of the diaphragm, which has the same effect as that of claim 4.

According to a sixth aspect of the present invention, the shape of the counter electrode used in the electrodeposition step is such that the film thickness of the electrodeposited resin film at least at the portion where the voice coil is joined is thicker than at other portions. 6. The method for manufacturing a speaker diaphragm according to claim 4 or 5, wherein the diaphragm of the annular recessed portion that joins the voice coil is made thicker by using the counter electrode having the above shape. As a result, there is an effect that the joint strength with the voice coil can be improved.

The invention according to claim 7 has a re-electrodeposition step of further forming an electrodeposition coating film on the surface of the electrodeposition resin film after the adhesion step, and manufacturing of the speaker diaphragm according to claim 5. In particular, by providing the coating film so as to cover the voice coil and the lead wire, it is possible to improve the bonding strength with the voice coil, and as a result, it is difficult to peel the voice coil. It plays.

In addition, by providing the coating film on the lead wire, the lead wire is fixed to the electrodeposition resin film, and as a result, generation of abnormal noise and disconnection can be suppressed. Is.

The invention described in claim 8 is the method for manufacturing a speaker diaphragm according to claim 7, wherein the resin used in the re-electrodeposition step is different from the resin used in the electrodeposition step, and different materials are used. By superimposing the thicknesses and thicknesses appropriately, the speaker diaphragm having different characteristics such as rigidity and internal loss can be easily manufactured.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION A speaker diaphragm according to the present invention and a method for manufacturing the same will be described below with reference to an embodiment and drawings. It should be noted that the same parts as those of the prior art are designated by the same reference numerals and the description thereof will be omitted.

(Embodiment 1) The invention described in claims 1 and 4 to 6 will be described with reference to Embodiment 1 of the present invention and FIGS.

FIG. 1 is a sectional view of a speaker diaphragm according to the first embodiment of the present invention.

The speaker diaphragm 4 is made of an epoxy resin or the like formed by electrodeposition, and the diaphragm 4 has a voice coil 16 in the annular concave fitting portion 4a and an outer peripheral holding ring 15 in the outer peripheral portion 4c. It is provided. Further, the thickness of the diaphragm 4 of the annular recessed fitting portion 4a is thicker than the other portions, whereby the adhesive strength with the voice coil 16 is enhanced. The lead wire 16 a of the voice coil 16 is led out to an external terminal (not shown) via the outer peripheral holding ring 15.

As a method of manufacturing the vibrating plate 4, first, as shown in FIG. 2, a release agent is applied to the lower surface of the metal plate 6 for electrodeposition to form a release agent layer 5.

Next, in FIG. 3, the electrodeposition metal film 6 is used for electrodeposition to form an electrodeposition resin film 4. The lower surface of the metal plate 6 for electrodeposition has the shape of the vibration plate 4, and the counter electrode 7 (cathode) is arranged at the opposite position. Here, in order to make the annular recessed fitting portion 4a thicker than other portions of the diaphragm 4, the metal mold 6 for electrodeposition and the counter electrode 7 have the following structures.

That is, a gap between the metal plate 6 for electrodeposition and the counter electrode 7 forming the annular concave fitting portion 4a of the diaphragm 4 (FIG. 3D).
Narrower than other gaps. By doing so, the current easily flows through the annular recess fitting portion 4a, and as a result, the annular recess fitting portion 4a can be formed thick.

After that, the electrodeposited resin film 4 can be peeled off to obtain the diaphragm 4.

After electrodeposition, the outer periphery holding ring 15 and the voice coil 16 may be bonded to the electrodeposited resin film 4. In that case, the procedure is as follows.

That is, a primer treatment is performed to modify the portion of the electrodeposition resin film 4 to which the outer circumference retaining ring 15 and the voice coil 16 are adhered, and then, as shown in FIG. 4, the outer circumference retaining ring 15 and the voice coil. The diaphragm 4 can be obtained by pressing and adhering 16 and then peeling. The outer peripheral holding ring 15 also serves as a positioning reference when the voice coil 16 is fitted into the magnetic gap of the magnetic circuit, and is bonded before the speaker diaphragm 4 is peeled off, so that the positioning accuracy is extremely high. Is what you can do.

According to the above manufacturing method, it is possible to provide the speaker diaphragm in which the voice coil is not easily peeled off.

(Embodiment 2) The invention described in claims 2, 3, 7 and 8 will be described with reference to Embodiment 2 of the present invention and FIG.

The second embodiment differs from the first embodiment in that a coating film 8 is provided by electrodeposition so as to cover at least the voice coil 16 and the lead wire 16a as shown in FIG. As a result, the bonding strength between the voice coil 16 and the electrodeposition resin film 4 is improved. In addition, by providing the coating film 8 on the lead wire 16a, the lead wire 16a is fixed to the electrodeposition resin film 4, and as a result, the generation of abnormal noise and the disconnection can be suppressed. It is a thing.

As this manufacturing method, for example, as shown in the first embodiment, the outer peripheral holding ring 15 and the voice coil 16 are adhered to the electrodeposition resin film 4 and then the coating film 8 is formed again by electrodeposition. Can be mentioned.

Here, as the material of the coating film 8, the same material as the electrodeposition resin film 4, for example, an epoxy resin may be used, or a different material, for example, a urethane resin may be used. When different materials are used, the speaker diaphragm 4 having different characteristics such as rigidity and internal loss can be obtained by appropriately selecting the overlapping range and the thickness.

Except for the above manufacturing method, materials and the like, a speaker diaphragm in which the voice coil is not easily peeled off can be provided by the same construction method as in the first embodiment.

[0034]

As described above, the present invention is a speaker diaphragm, in which the diaphragm thickness of the annular concave fitting portion is thicker than the diaphragm thickness of the outer peripheral portion, and a voice coil is joined thereto. By increasing the thickness of the diaphragm of the annular concave fitting portion, it is possible to improve the bonding strength with the voice coil,
As a result, there is an effect that the voice coil is less likely to come off.

[Brief description of drawings]

FIG. 1 is a sectional view of a speaker diaphragm according to an embodiment of the present invention.

FIG. 2 is a sectional view of the manufacturing process.

FIG. 3 is a sectional view of the same.

FIG. 4 is a sectional view of the same.

FIG. 5 is a sectional view of the same.

FIG. 6 is a cross-sectional view of a conventional speaker diaphragm.

FIG. 7 is a sectional view of a conventional manufacturing process.

[Explanation of symbols]

4 Speaker diaphragm 4a annular concave fitting portion 4c outer peripheral part 5 Release agent layer 6 Metal dressing 7 Counter electrode 8 coating film 15 Peripheral retaining ring 16 voice coils 16a lead wire

Claims (8)

[Claims] 1. A speaker diaphragm comprising: a diaphragm; a voice coil provided in an annular concave fitting portion on the back surface of the diaphragm; and an outer peripheral holding ring provided on an outer peripheral portion of the diaphragm. A diaphragm for a speaker, characterized in that the diaphragm thickness of the annular recessed portion is thicker than the diaphragm thickness of the outer peripheral portion. 2. A resin vibrating plate formed by electrodeposition, a voice coil provided in an annular concave fitting portion on the back surface of the vibrating plate, and an outer peripheral holding ring provided on the outer peripheral part of the vibrating plate. A diaphragm for a speaker, which comprises a coating film provided by electrodeposition so as to cover at least the voice coil and the lead wire. 3. The speaker diaphragm according to claim 2, wherein the resin material of the diaphragm and the material of the coating film are different. 4. A release agent forming step of forming a release agent layer on the surface of a conductive metal mold; an electrodeposition step of forming an electrodeposition resin film on the surface of the release agent layer by electrodeposition; A method of manufacturing a speaker diaphragm, comprising a peeling step of peeling a resin coating film. 5. The speaker according to claim 4, further comprising a bonding step of bonding an outer periphery holding ring to an outer peripheral portion of the diaphragm and a voice coil to an annular recessed fitting portion of the diaphragm in a primary process after the electrodeposition step. Diaphragm manufacturing method. 6. The shape of the counter electrode used in the electrodeposition step is such that at least a portion where the voice coil is joined has a thicker electrodeposited resin film than other portions. Item 6. A method of manufacturing a speaker diaphragm according to Item 5. 7. The method for manufacturing a speaker diaphragm according to claim 5, further comprising a re-electrodeposition step of further forming an electrodeposition coating film on the surface of the electrodeposition resin film after the adhesion step. 8. The method for manufacturing a speaker diaphragm according to claim 7, wherein the resin used in the re-electrodeposition step is different from the resin used in the electrodeposition step.