JPH0434876B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method of manufacturing a speaker suitable for use in manufacturing a flat speaker.

BACKGROUND ART AND PROBLEMS Generally, when manufacturing a speaker, the voice coil must be installed at a predetermined position within a narrow gap between a center pole and a plate.

For this reason, when manufacturing a conventional cone-type speaker, a voice coil insertion jig is used that has a film-shaped or thin-walled cylindrical guide part for positioning within a predetermined gap inside the hollow cylinder of the coil bobbin around which the voice coil is wound. With the coil bobbin installed, insert it into the gap between the center pole and the plate and position it at the predetermined position, then fix the outer periphery of the damper to the frame, and then fix the diaphragm fixed to the coil bobbin. The edge part is fixed to the frame, and the coil bobbin is held in a predetermined position by supporting it at the two points mentioned above, and in this state, from the opening of the coil bobbin, that is, from the front of the center pole,
It was common practice to assemble and manufacture a speaker by removing the voice coil insertion jig and fitting a cap into the opening of the coil bobbin.

However, when manufacturing a flat speaker with a flat diaphragm, if you try to position the coil bobbin using a voice coil insertion jig, there is no problem in fixing the damper.
If the diaphragm is fixed to the coil bobbin, the voice coil insertion jig cannot be removed, so it is not possible to use the same manufacturing method as conventional cone-shaped speakers.

Therefore, one possible method is to first position the coil bobbin using a voice coil insertion jig, then remove the voice coil insertion jig while supporting it at one point fixed to the outer peripheral frame of the damper, and then fix the diaphragm. Then, when fixing the diaphragm part, the coil bobbin is supported only by the damper,
Since it is difficult to maintain the predetermined position determined by the voice coil insertion jig, there is a drawback that the production rate of defective products that are incorrectly fixed is increased.

Next, a possible method is to make a hole in the diaphragm to take out the voice coil insertion jig, but this has the disadvantage that the strength of the diaphragm becomes weak.

Another method is to position the coil bobbin in a predetermined position using an external jig, but this would make the jig for positioning complicated and difficult to handle. It is inevitable that there will be some shortcomings such as insufficient

Purpose of the Invention In view of the above-mentioned points, the present invention enables the coil bobbin to be accurately assembled in a predetermined position, thereby reducing the number of defective products and improving the yield of products, as well as facilitating manufacturing work and improving productivity. It is an object of the present invention to provide a new method for manufacturing a speaker that can be used for manufacturing flat speakers.

Summary of the Invention The present invention first positions the coil bobbin using a voice coil insertion jig that positions the center pole and the coil bobbin, and then inserts a ring portion that fits on the outside of the coil bobbin and a ring portion that extends from the ring portion. Fix the support end of the temporary fixing jig, which has multiple supports, to the frame, then remove the voice coil insertion jig, then attach the diaphragm part to the coil bobbin, and finally fix the support part of the temporary fixation jig. This method allows for accurate assembly, which improves product yield, and also makes manufacturing easier and improves productivity. It can also be used to manufacture flat speakers. It is characterized by what is possible.

Embodiment Hereinafter, an embodiment of the method for manufacturing a speaker of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view of a flat speaker manufactured by the manufacturing method of this embodiment, and FIG. 2 is a partially exploded perspective view thereof. However, FIG. 2 also shows jigs used during assembly. Reference numeral 1 designates a center pole, which together with a bottom plate 1a, a magnet 2, and a plate 3 constitutes a magnetic circuit.

Further, 5 is a coil bobbin, and a voice coil 4 is wound around the lower part of this coil bobbin. 7 is a damper that supports this coil bobbin 5; 17 is a planar diaphragm; this diaphragm 17 is attached to the coil bobbin 5 by a coupler 18; frame 20 through
is supported by

Next, a method for manufacturing (assembling) such a speaker will be explained step by step.

First, as shown in FIG. 3, a frame 20 is attached to a magnetic circuit consisting of a center pole 1, a bottom plate 1a, a magnet 2, and a plate 3, as in the conventional case. As shown in the figure, the frame 20 has through holes 21 formed at a plurality of locations.

Next, as shown in FIG. 4, the voice coil insertion jig 6 is fitted onto the center pole 1, and the coil bobbin 5 (on which the voice coil 4 is wound in advance) is fitted onto it. Note that the voice coil insertion jig 6 may be fitted into the coil bobbin 5 in advance and then fitted onto the center pole 1. As shown in FIGS. 2 and 4, for example, this jig 6 includes a cylindrical portion 6a that fits directly between the center pole 1 and the coil bobbin 5, and a disc that faces above the center pole 1. 6b, and can be integrally formed from resin.

Note that by pushing the jig 6 all the way into the center pole 1 with the lower end of the cylindrical portion 6a of the jig 6 and the lower end of the coil bobbin 5 aligned,
The position of this coil bobbin 5 in the height direction can be set in advance.

In this state, the coil bobbin 5 is positioned at a predetermined position within the gap A by the voice coil insertion jig 6.

Next, the damper 7 is inserted into the coil bobbin 5. This damper 7 has an elastic member formed in a concentric wave shape, a circular hole in the center into which the coil bobbin 5 is fitted, and a fixing flat plate portion 7a on the outer periphery. The damper 7 is constructed by fitting the circular hole at the center of the damper 7 into the coil bobbin 5 positioned at a predetermined position, and forming the fixing flat plate part 7a of the damper 7 as an annular base at a predetermined position on the inner periphery of the speaker frame. While the damper 7 is being pulled down so that it rests on the supported round support section 8, the area around the circular hole of the damper 7 is attached to the outer side of the coil bobbin with adhesive, and the fixing flat plate section 7a of the damper 7 is attached to the frame. It is pasted and fixed on the support round table part 8 of the.

Next, a temporary fixing jig 9 is attached to the upper part of the coil bobbin 5 as shown in FIG. An example of this temporary fixing jig 9 is shown in FIG. 6, and it is made of a material such as a Bakelite plate, a plastic plate, paper, or a metal plate. An annular ring 10 and a plurality of rings (four in this example) extending from the ring 10.
The support part 11 is comprised of a support part 11 of

Further, the support parts 11 of this temporary fixing jig 9 are formed into a required shape by taking into account the position and shape of the supports of the speaker frame, and in this example, the support parts 11 are formed in pairs extending radially. They are bent parallel to each other from the middle. Note that when the supports of the speaker frame are oriented in a quarter-quadrant direction, the support portion 11 may be arranged in a cross-shaped position as shown in FIG.

Furthermore, the ring portion 10 and the support portion 11 of the temporary fixing jig 9
A narrow groove 12 is bored near the boundary between the supporting part 11 and a narrow groove 13 is bored near the free end of the supporting part 11, so that the narrow grooves 12 and 13 can be easily cut. It goes without saying that instead of the narrow grooves 12 and 13, V-cut groove perforations, small holes, etc. may be provided.

In the temporary fixing jig 9 formed in this way, the ring part 10 is inserted into the coil bobbin 5 which is positioned at a predetermined position by the voice coil insertion jig 6, and the free end of each support part 11 is connected to the speaker. Each of the four pillars 14, which are provided upwardly projecting from the support round part 8 constituting the frame, is placed on a support part 15 formed by bending a predetermined position into a step shape.

Then, the outer side of the coil bobbin 5 and the ring part 10 of the temporary fixing jig 9 are adhered with adhesive, and the free ends of each support part 11 are respectively adhered to the support base part 15 of each column. Thus, coil bobbin 5
is supported in a so-called two-point support state by the damper 7 and the temporary fixing jig 9, and can be held at a predetermined position even without the voice coil insertion jig 6.
After that, the voice coil insertion jig 6 is pulled out from the front of the frame 20.

Then, the diaphragm portion 16 is attached to the speaker frame. This diaphragm portion 16 includes a diaphragm 17 having a honeycomb structure, a coupler 18 as shown in FIG. and an edge portion 19 for attachment between the speaker frame 20 and the speaker frame 20.

The thus configured diaphragm portion 16 is attached by fixing the ring portion of the coupler 18 to the upper end of the coil bobbin 5 (for example, by gluing) and attaching the edge 19 to the frame 20 (for example, by gluing). In this state, the coil bobbin 5 is supported by the damper 7 and the diaphragm portion 16 in a so-called two-point supported state, and can be held at a predetermined position even without the temporary fixing jig 9.

Finally, insert your hand through the through hole 21 of the frame 20 and break off the temporary fixing jig 9 from the narrow grooves 12 and 13, or insert scissors or the like and cut it.
By removing most of the support portion 11 of the temporary fixing jig 9, the speaker shown in FIG. 1 can be manufactured.

In addition, the temporary fixing jig 9 left on the coil bobbin 5
The ring portion 10 can be used as a reinforcing member for the coil bobbin 5.

In this way, according to the method of manufacturing a speaker using the temporary fixing jig 9, the coil bobbin can be easily and reliably held in a predetermined position, thereby improving productivity and product yield. Furthermore, when designing a speaker, manufacturing using this temporary fixing jig 9 increases the degree of structural freedom.For example, even if the shape of the coupler 18 of the diaphragm 17 changes, the same temporary fixing jig 9 can be used. This increases the degree of freedom in design. Furthermore, the work steps in speaker manufacturing work can be reduced or simplified.

Application Example In the above-described embodiments, a method for manufacturing a flat speaker was described, but it goes without saying that the present invention can also be applied to a method for manufacturing a cone speaker.

Effects of the Invention As detailed above, according to the speaker manufacturing method of the present invention, the coil bobbin can be accurately assembled in a predetermined position by using a temporary fixing jig, thereby reducing the number of defective products and improving the product yield. In addition, the coil bobbin can be fixed in a predetermined position using a temporary fixing jig before work can be carried out, and the manufacturing process is easy, as all that is needed is to remove unnecessary parts of the temporary fixing jig. This has the effect of improving productivity.

Further, if this temporary fixing jig is used, it is extremely effective in manufacturing a flat speaker.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing an example of a speaker manufactured according to the present invention, FIG. 2 is an exploded perspective view of its main parts, FIGS. 3 to 5 are cross-sectional views showing the manufacturing process of the speaker, and FIG. The figure is a plan view showing an example of the temporary fixing jig, and FIG. 7 is a plan view showing another example of the temporary fixing jig. 1 is a center pole, 5 is a coil bobbin, 6 is a voice coil insertion jig, 7 is a damper, 9 is a temporary fixing jig, and 11 is a support portion.

Claims (1)

[Claims] 1. Position the coil bobbin using a voice coil insertion jig that is inserted between the center pole and the coil bobbin to position them, and then insert the ring part that fits on the outside of the coil bobbin and the The tip of the support part of the temporary fixing jig, which is provided with a plurality of extending support parts, is fixed to the frame, and then the voice coil insertion jig is removed, and then the diaphragm part is attached to the coil bobbin, and finally the temporary fixation jig is fixed to the frame. A method of manufacturing a speaker, characterized in that a support portion of a fastening jig is removed.