JP3173133B2 - Manufacturing method of voice coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an elliptical voice coil used in a speaker.

[0002]

2. Description of the Related Art A configuration in which a voice coil having an elliptical cross section is used in a loudspeaker, particularly a dome-shaped tweeter or a semi-dome-shaped loudspeaker, has already been disclosed, but a method of manufacturing the voice coil has not been clarified. An example of a speaker using a voice coil having a rectangular cross section is found in a rectangular flat speaker or the like.

[0003] A conventional method for manufacturing a voice coil will be described below. 7 to 9 show a conventional method for manufacturing a voice coil having a circular cross section. FIGS. 7 and 8 show a winding process using a winding jig in a conventional method of manufacturing a voice coil having a circular cross section. FIG. 9 shows a baking process in a conventional method of manufacturing a voice coil having a circular cross section.

In FIGS. 7 and 8, reference numeral 1 denotes an openable cylinder having a predetermined diameter when a taper pin 2 is inserted. Reference numeral 3 denotes a lower end of a voice coil winding width fixed to the cylinder 1 with screws 4. It is a ring that regulates. Reference numeral 5 denotes a voice coil bobbin in which a strip-shaped material is wound on the cylinder 1, and 6 is the voice coil bobbin.
This is a ring that regulates the upper end of the voice coil winding width fixed to. The taper pin 2 is fixed to a shaft 7 of a rotating machine (not shown) by a screw 8 also serving as a slide knob and rotates. The screw 8 also serving as the slide knob is a slide provided on a side wall of the cylindrical body 1. It is inserted into the guide 9. The voice coil wire 10 is wound around the voice coil bobbin 5 to form a voice coil 11. Reference numeral 12 denotes an alcohol application device for applying alcohol to the voice coil wire 10 just before the voice coil wire 10 is wound.

[0005] The principle of operation of the method of manufacturing the voice coil configured as described above will be described below. First, the openable cylinder 1 is slid toward the shaft 7 so that the tapered pin 2 is completely inserted to form a predetermined diameter. Next, the voice coil bobbin 5 is wound around the cylindrical body 1. After the tip of the voice coil wire 10 is temporarily fixed to the ring 6 that regulates the upper end of the voice coil winding width, it is wound a predetermined number of turns on the first layer, and is folded back by the ring 3 that regulates the lower end of the voice coil winding width. A predetermined number of turns of the second layer are wound. When the winding is completed, the voice coil wire loop 10 is cut off, the ring 6 that regulates the upper end of the voice coil winding width is removed, and the openable cylinder 1 is slid to the opposite side of the shaft 7 to remove the tapered pin 2. The voice coil 11 can be easily removed from the winding jig.

[0009] In FIG. 9, reference numeral 12 denotes a baking rod made of a metal such as aluminum having good heat conductivity and having a circular cross section corresponding to the inner diameter of the voice coil bobbin 5. , And the fusion layer of the voice coil 11 is completely cured.

[0007]

However, as described above, in the conventional method of manufacturing a voice coil having a circular cross section, the internal shape is uniformly generated in the strip-shaped voice coil bobbin 5 so that the cross section becomes circular. Although the concentricity is ensured by the soldering, when the cross section is elliptical, the internal stress is not uniform between the portion having a small curvature and the portion having a large curvature, so that springback occurs and the desired shape cannot be maintained. In addition, there is a problem that when assembled into a speaker, an abnormal sound such as gap rubbing is generated, giving a quality problem.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a method of manufacturing a voice coil capable of realizing a voice coil having a desired elliptical cross section.

[0009]

In order to achieve this object, a method of manufacturing a voice coil according to the present invention comprises at least a step of forming a voice coil bobbin of an elliptical cylindrical body by molding a metal foil or forming a resin by injection molding. A voice coil winding step of inserting a voice coil wire loop on the voice coil bobbin, temporarily fixing the voice coil wire loop, by inserting the voice coil wire loop into the open-type winding jig having a side wall surface having an elliptical cylindrical cross section; The baking process is performed by inserting the coil into a baking rod having an oval cylindrical side wall.

Further, in order to enhance the shape holding force, the voice coil bobbin forming step of forming an elliptical cylinder having an affixed portion matching the curvature of the elliptical dome-shaped diaphragm to be affixed to the upper end is replaced. Can also.

Further, the present invention can be replaced with a voice coil bobbin forming step of forming an elliptical cylinder having an elliptical dome-shaped diaphragm integrally at the upper end.

[0012]

By making the method of manufacturing the voice coil as described above, internal stress is applied to the voice coil bobbin having an elliptical cross section in order to secure the shape of the metal foil by plastic deformation or resin injection molding in the voice coil bobbin forming step. Since this does not occur, a voice coil having a desired elliptical cross section can be realized.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. 1 (a) to 1 (c) are perspective views showing a method of manufacturing a voice coil having an elliptical cross section according to one embodiment.
The voice coil bobbin 21 having an elliptical cross section and extending downward in a cylindrical shape is formed integrally with a peripheral portion of the dome portion 20.
0 and the voice coil bobbin 21 are cut as shown in FIG. 1B, and a voice coil wire loop 22 is wound around the lower outer peripheral portion of the voice coil bobbin 21 as shown in FIG.
The voice coil 23 is obtained by performing a baking process.

The cut dome portion 20 can be used as a dome-shaped diaphragm of another speaker or as a dust cap of a cone type speaker.

FIGS. 2A to 2C show a second embodiment. FIG. 2A shows an example in which a metal foil is molded to have an elliptical dome portion 20 on the upper surface, and a voice coil bobbin 21 having an elliptical cross section extending downward is integrally formed on a peripheral portion of the dome portion 20. Yes, and molded in this way
As shown in FIG. 2B, the dome portion 20 is cut so as to leave a part of the peripheral portion thereof to form an attachment portion 24 with the diaphragm, and a voice coil wire loop is attached to the voice coil bobbin 21 having the attachment portion 24 at the upper end. 22 is wound and subjected to a baking process to form a voice coil 23 shown in FIG. 2 (c).

As a third embodiment, FIG.
As shown in (a) and (b), it can also be manufactured.
That is, as shown in FIG. 3 (a), a metal foil is formed to have an elliptical dome portion 20 on the upper surface, and a voice coil bobbin 21 having an elliptical cross section extending downward is integrated with a peripheral portion of the dome portion 20. FIG. 3 shows the structure thus formed.
As shown in FIG. 2B, a voice coil 23 is wound around a voice coil bobbin 21 around the lower portion of the voice coil bobbin 21 and subjected to a baking process to use the dome portion 20 as a dome diaphragm.

Next, the winding step in the method of manufacturing the voice coil will be described with reference to FIGS.

FIGS. 4 and 5 show a winding jig and a winding process in a method of manufacturing a voice coil having an elliptical cross section according to the present embodiment.

4 and 5, reference numeral 25 denotes a tapered pin 2.
6 is an openable elliptical cylindrical body having a predetermined elliptical cylindrical cross-section when a cross-section is inserted, and 27 is a ring for restricting the lower end of the voice coil winding width fixed to the elliptical cylindrical body 25 with screws 28. It is. Reference numeral 21 denotes a voice coil bobbin that forms an elliptical cylinder having the elliptical dome portion 20 integrally at the upper end. The taper pin 26 is fixed to a shaft 29 of a rotating machine (not shown) by a screw 30 also serving as a slide knob, and is rotated. The screw 30 also serving as the slide knob is a slide provided on a side wall of the cylindrical body 25. It is inserted into the guide 31. The voice coil wire loop 22 is wound around the voice coil bobbin 21 to form a voice coil 23. 32
Is an alcohol coating device for applying alcohol to the voice coil wire 22 just before the voice coil wire 22 is wound.

The operation principle of the winding jig and the winding process in the method of manufacturing the voice coil configured as described above will be described below. First, without opening the taper pin 26 completely, the openable elliptical cylinder 25 is slid to the side opposite to the shaft 29 so as to form a side wall having a cross section smaller than a predetermined elliptical cylinder. Next, the voice coil bobbin 21
(In the illustration, a voice coil bobbin 21 forming an elliptical cylinder integrally having an elliptical dome 20 at the upper end) is inserted into the elliptical cylinder 25. Then, the openable elliptical cylinder 25 is slid toward the shaft 29 so that the tapered pin 26 is completely inserted to form a predetermined elliptical cylindrical side wall surface. After the front end of the voice coil wire ring 22 is temporarily fixed to the voice coil bobbin 21, it is wound a predetermined number of turns in the first layer, and is turned back by the ring 27 that regulates the lower end of the voice coil winding width. It is wound several times. When the winding is completed, the voice coil wire loop 22 is cut, and the openable elliptical cylindrical body 25 is further slid to the side opposite to the shaft 29 so that the tapered pin
6 is removed, the major axis and minor axis of the open-movable elliptical cylinder 25 are reduced, and the voice coil 23 is easily removed from the winding jig. At this time, the voice coil wire ring 22 is temporarily fixed by solidification of the insulating film dissolved by the alcohol.

Referring to FIG. 6, the baking process will be described. Reference numeral 33 denotes a baking process rod made of a metal having good heat conductivity, such as aluminum, having a cross section that matches the elliptical shape of the voice coil bobbin 21. And heat-treated in a high-temperature atmosphere.

In the above description, the voice coil bobbin 21 has been described as being formed of a metal foil, but may be formed by injection molding of a resin.

As described above, according to the present embodiment, in the method of manufacturing the voice coil, at least a voice coil bobbin forming step of forming an elliptical cylinder by molding a metal foil or forming a resin by injection molding; A voice coil wire loop 22 is wound around the voice coil bobbin 21 by inserting the voice coil wire loop 22 on the voice coil bobbin 21.
And a baking process rod 3 having an elliptical cylindrical side wall surface.
Since the voice coil bobbin 21 is made of metal foil or resin by injection molding, the voice coil bobbin 21 can be maintained in an oval shape without any internal stress. In the voice coil bobbin 21 forming an elliptical cylinder having an elliptical cylinder, and the voice coil bobbin 21 forming an elliptical cylinder integrally having an elliptical dome 20 at the upper end, a dome-shaped diaphragm portion at the upper end increases the shape holding strength. Since the ribs and ribs are formed, it is possible to provide the voice coil 23 having an elliptical cross section which can hold the elliptical shape more correctly, and can further contribute to solving a quality problem of abnormal sound generation such as gap rubbing when assembled into a speaker. Things.

[0024]

As described above, the method of manufacturing a voice coil according to the present invention comprises at least a voice coil bobbin forming step of an elliptical cylindrical body formed by molding a metal foil or resin by injection molding; A voice coil winding step of inserting a voice coil wire around the voice coil bobbin by inserting it into an open-type winding jig having a side wall surface, and temporarily fixing the voice coil wire, The baking processing step is performed by inserting into a baking processing rod having a side wall surface.In the voice coil bobbin forming step, furthermore, the voice coil bobbin has an affixing portion that matches the curvature of the elliptical dome-shaped diaphragm to be affixed to the upper end. The internal stress is increased by forming a voice coil bobbin forming an elliptical cylinder or an elliptical cylinder integrally having an elliptical dome-shaped diaphragm at the upper end. Cross-section can be held properly elliptical shape does not occur to provide a voice coil of elliptical, in which further contribute to solving quality problems of abnormal sound generation, such as rubbing gap when incorporating the speaker.

[Brief description of the drawings]

FIGS. 1A to 1C are perspective views showing steps of a method of manufacturing a voice coil having an elliptical cross section in an embodiment of the present invention.

FIGS. 2A to 2C are perspective views showing steps of another embodiment.

FIGS. 3A and 3B are perspective views showing steps of still another embodiment.

FIG. 4 is a half sectional front view showing a winding jig and a winding process in a method of manufacturing a voice coil having an elliptical cross section in one embodiment of the present invention.

FIG. 5 is a side view of the winding process.

FIG. 6 is a perspective view showing a baking process in a method of manufacturing a voice coil having an elliptical cross section in one embodiment of the present invention.

FIG. 7 is a half sectional front view showing a winding jig and a winding process in a conventional method of manufacturing a voice coil having a circular cross section.

FIG. 8 is a side view of the same.

FIG. 9 is a perspective view showing a baking process in a conventional method of manufacturing a voice coil having a circular cross section.

[Explanation of symbols]

 Reference Signs List 20 Dome part 21 Oval voice coil bobbin 22 Voice coil wire ring 23 Voice coil 24 Adhering part 25 Elliptic cylinder 26 Tapered pin 27 Ring 28 Screw 29 Axis 30 Screw 31 Slide guide 32 Alcohol coating device 33 Baking process with elliptical cross section rod

Claims (3)

(57) [Claims] At least a step of forming a voice coil bobbin of an elliptical cylindrical body formed by molding a metal foil or resin by injection molding, and inserting the voice coil bobbin into an open-type winding jig having an elliptical cylindrical side wall surface, A voice coil winding step of winding a voice coil wire loop on the voice coil bobbin and temporarily fixing the voice coil wire loop, and a baking processing step of inserting the voice coil into a baking rod having an elliptic cylindrical side wall surface. A method for manufacturing a voice coil having: 2. A voice coil bobbin forming step for forming an elliptical cylindrical body having an affixed portion corresponding to a curvature of an elliptical dome-shaped diaphragm to be affixed to an upper end portion. Law. 3. The method of manufacturing a voice coil according to claim 1, further comprising a voice coil bobbin forming step of forming an elliptical cylindrical body integrally having an elliptical dome-shaped diaphragm at an upper end portion.