JP3123223B2 - 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 Although a configuration using a voice coil having an elliptical cross section in a loudspeaker, especially a dome-shaped tweeter or a semi-dome-shaped loudspeaker, has already been announced, a method of manufacturing the voice coil has not been clarified yet. 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. 5 and 6 show a winding jig and a winding process in a conventional method of manufacturing a voice coil having a circular cross section. FIG.
Indicates a baking process in a conventional method of manufacturing a voice coil having a circular cross section. 5 and 6, reference numeral 1 denotes an openable cylinder that forms a predetermined diameter when the taper pin 2 is inserted. Reference numeral 3 denotes a lower end of the voice coil winding width fixed to the cylinder 1 with screws 4. It is a ring. Reference numeral 5 denotes a voice coil bobbin in which a strip-shaped material is wound on the cylindrical body 1;
Reference numeral denotes a ring fixed to the cylindrical body 1 for regulating the upper end of the voice coil winding width.

The taper pin 2 is a rotating machine (not shown)
The screw 8, which also serves as a slide knob, is fixed to the shaft 7 by a screw 8 also serving as a slide knob, and the screw 8, which also serves as the slide knob, is inserted into a slide guide 9 provided on the side wall of the cylindrical body 1. 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.

In FIG. 7, reference numeral 13 denotes a baking rod having a circular cross section corresponding to the inner diameter of the voice coil bobbin 5 and made of a metal such as aluminum having good heat conductivity. , And the fusion layer of the voice coil is completely cured.

[0007]

However, as described above, in the conventional method for manufacturing a voice coil having a circular cross section, the cross section will be circular because internal stress is uniformly generated in the strip-shaped voice coil bobbin. However, 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 a desired shape cannot be maintained. Also, manufacturing an elliptical voice coil with a conventional extension manufacturing method creates a precise baking rod with an elliptical cross section and deforms the voice coil when inserting it into the elliptical baking rod. It is expected that manufacturing will be very difficult. Further, when assembled into a speaker, an abnormal sound such as gap rubbing may be caused and a problem of quality may be caused.

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 the steps of: winding a voice coil wire loop on a voice coil bobbin with a winding jig having at least a circular cross section; The method includes a voice coil winding step for temporarily fixing the coil wire loop, and a baking processing step in which the voice coil is inserted into an open-type baking processing jig having an elliptical cylindrical side wall surface.

[0010]

By manufacturing as described above, the heat-resistant voice coil is completely cured after the baking process is performed in a high-temperature atmosphere. Since the joint strength between the space and the voice coil bobbin can be secured and the shape retention force can be secured,
A voice coil having a desired elliptical cross section can be easily realized without occurrence of springback. Furthermore, when incorporated in a speaker, it can contribute to solving the quality problem of abnormal sound generation such as gap rubbing.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a winding jig and a winding step in a method of manufacturing a voice coil having an elliptical cross section according to the present embodiment. explain. In FIG. 1 and FIG. 2, reference numeral 1 denotes an openable cylinder that forms a predetermined diameter when the tapered pin 2 is inserted.
Reference numeral 3 denotes a ring that is fixed to the cylindrical body 1 with a screw 4 and that regulates the lower end of the voice coil winding width. Reference numeral 5 denotes a voice coil bobbin in which a strip-shaped material is wound on a cylindrical body, and reference numeral 6 denotes a ring that is fixed to the cylindrical body 1 and regulates a voice coil winding upper end. 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.

The description of the operation principle of the winding jig and the winding step is the same as that of the conventional example, and will not be repeated. 3 and 4 show a baking processing jig and steps used for manufacturing a voice coil having an elliptical cross section according to the present invention.

In FIGS. 3 and 4, reference numeral 21 denotes an open baking jig made of a metal such as aluminum having good heat conductivity. This is a taper pin 22 having a circular cross section,
It comprises an elliptical baking rod 25 having a plurality of partially elliptical cylindrical side walls 23a to 23d and forming a hole 24 in the center where the tapered pin 22 is inserted. The tapered pin 22 is completely inserted. Occasionally, the plurality of partial elliptical cylindrical side walls 23a to 23d open and form an elliptical cross section having an elliptical peripheral length matching the inner peripheral length of the voice coil bobbin 5.

The operation of the voice coil baking process in the method of manufacturing a voice coil having an elliptical cross section as described above will be described below.

First, when the taper pin 22 is removed, the major and minor diameters of the plurality of partially elliptical cylindrical side walls 23a to 23d become small, and the partially elliptical cylindrical side wall 23a is formed while deforming the voice coil 11 into an elliptical shape. ~ 23d can be easily inserted into an elliptical baking rod 25.
Next, the tapered pin 22 is inserted into the oval baking rod 25 into which the voice coil 11 is inserted, and the cross section of the baking rod 25 is shaped into an ellipse. Next, in this state, a heat treatment is performed by exposing to a high-temperature atmosphere to cure the fused layer of the voice coil wire loop 10. Next, taper pin 2
When 2 is removed, a plurality of partial elliptic cylindrical side walls 23a to 23d
The major and minor diameters of the voice coil 26 are reduced, and the voice coil 26 having an elliptical cross section is easily removed.

As described above, according to the present embodiment, in the method of manufacturing the voice coil, at least the voice coil wire loop 1 is mounted on the voice coil bobbin 5 with a winding jig having a circular cross section.
0, and a voice coil winding step of temporarily fixing the voice coil wire loop 10 with alcohol or the like, and baking performed by inserting the voice coil 11 into an open-type baking processing jig having an elliptical cylindrical side wall surface. If it is performed in the processing step, the voice coil 11 can be easily inserted into the elliptical baking processing jig. In the heat-resistant voice coil 11, after the baking processing is performed in a high-temperature atmosphere, the fusion layer of the voice coil wire 10 is removed. Because it is completely cured, the voice coil wire 11 can secure the bonding strength between the wires and between the voice coil bobbin 5 and the shape retaining force, so that a voice coil having a desired elliptical cross section without springback can be obtained. 11 can be easily realized. Furthermore, when incorporated in a speaker, it can contribute to solving the quality problem of abnormal sound generation such as gap rubbing.

[0017]

As described above, according to the present invention, at least a voice coil winding step of winding a voice coil wire around a voice coil bobbin with a winding jig having a circular cross section and temporarily fixing the voice coil wire ring. By manufacturing the voice coil in a baking process performed by inserting the voice coil into an open-type baking process jig having an elliptical cylindrical side wall surface, a cross section that is difficult to form with a conventional manufacturing method is obtained. An elliptical voice coil can be easily provided, and when incorporated into a speaker, it can contribute to solving a quality problem of abnormal sound generation such as gap rubbing.

[Brief description of the drawings]

FIG. 1 is a half sectional front view showing a winding step in a method of manufacturing a voice coil having an elliptical cross section in one embodiment of the present invention.

FIG. 2 is a side view of the main part.

FIG. 3 is a half sectional front view showing a baking process used for manufacturing a voice coil having an elliptical cross section in one embodiment of the present invention.

FIG. 4 is a side view of the same.

FIG. 5 is a half sectional front view showing a conventional winding step of a method for manufacturing a voice coil having a circular section.

FIG. 6 is a side view of the main part.

FIG. 7 is a perspective view showing a conventional baking process in a method of manufacturing a voice coil having a circular cross section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Opening cylinder 2 Taper pin 3 Ring 4 Screw 5 Voice coil bobbin 6 Ring 7 Axis 8 Slide knob combined screw 9 Slide guide 10 Voice coil wire 11 Voice coil with circular cross section 12 Alcohol coating device 13 Baking with circular cross section Processing rod 21 Opening-type baking jig having an elliptical cross section 22 Taper pins 23a to 23d Partial elliptic cylindrical side wall surface 24 hole 25 Oval baking processing rod 26 Voice coil having an elliptical cross section

Claims (1)

(57) [Claims] 1. A voice coil winding step of winding a voice coil wire around a voice coil bobbin with a winding jig having at least a circular cross section and temporarily fixing the voice coil wire, and forming the voice coil into an elliptical cylindrical shape. A method for manufacturing a voice coil, comprising a baking process step of inserting into an open-type baking process jig having a side wall surface.