JPH0562517B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a flat speaker unit that reduces gap rubbing defects in a flat speaker unit.

Configuration of Conventional Example and Its Problems A conventional manufacturing method for a flat speaker will be described below.

FIG. 1 is a half-sectional view of a speaker according to an assembly procedure of a conventional method for manufacturing a flat-plate speaker. Reference numeral 1 denotes a yoke, which has a flange portion 2 and a center pole portion 3. As shown in FIG. 4 is a magnet, 5 is a plate having a through hole in the center, and 6 is its inner peripheral surface. 7 is a voice coil bobbin, 8 is a voice coil, and 9 is a frame attached to the plate 5. Reference numeral 10 denotes a center holder, which is fixed to the voice coil 7 and the frame 9 at the inner and outer peripheries, respectively. 11 is a coupling cone whose inner circumferential portion is fixed to the voice coil bobbin 7. Reference numeral 12 denotes a collar provided on the outer periphery of the coupling cone 11, which is joined to the flat diaphragm 13. 14 is an edge whose inner periphery is a flat plate diaphragm 13 and its outer periphery 1
5 are respectively joined to the outer circumferential flat portion 16 of the frame 9. The flat plate diaphragm 13 and the edge 14 constitute a prepared diaphragm 17 which has been joined together in advance.

A method of assembling the speaker configured as above will be described below. First, field part 1 and frame 9
join. Next, the center holder 10, the voice coil bobbin 7, and the coupling cone 11 are each joined to form the prepared parts, and then the bobbin spacer 18
is placed over the sensor pole 3, and the voice coil bobbin 7, which is the prepared part, is inserted into the outer periphery of the bobbin spacer 18. At the same time, the outer periphery of the center holder 10 is fixed to the frame 9. After that, install bobbin spacer 1
Remove 8. Next, the diaphragm 1 of the prepared diaphragm 17
3 and edge outer periphery 15 are fixed to coupling cone collar 12 and frame outer periphery 16, respectively.

However, if the central axis of the voice coil bobbin 7 and the flat plate diaphragm 13 are not fixed perpendicularly in the conventional assembly method described above, the central axis of the voice coil bobbin 7 will be tilted with respect to the central axis of the center pole 3.
The problem is that the inner periphery of the voice coil bobbin 7 and the outer periphery of the center pole 3 come into contact, and the voice coil 8 and the inner periphery of the plate through-hole 6 come into contact, creating a phenomenon called gap rubbing, resulting in defective products. It had a point.

Purpose of the invention The present invention solves the above-mentioned conventional problems.
It is an object of the present invention to provide a method for manufacturing a flat speaker that can reduce gap rubbing defects.

Structure of the Invention The present invention is a method for manufacturing a flat speaker using a coupling cone with a through hole and a plurality of ribbon spacers, and after removing the bobbin spacer or instead of the bobbin spacer, one end of the plurality of ribbon spacers is placed in the center. By inserting the ribbon spacer between the pole and the voice coil bobbin, leaving the other end out through the hole in the coupling cone, and removing all the ribbon spacers after assembly is complete, gap rubbing defects can be greatly reduced.

Embodiment of the Invention FIG. 2 is a diagram showing a method of manufacturing a flat speaker according to an embodiment of the present invention. In Fig. 2, 1 is a yoke, 2 is a flange thereof, 3 is a center pole part, 4 is a magnet, 5 is a plate, 6 is an inner peripheral surface of a through hole, 7 is a voice coil bobbin, 8 is a voice coil, and 9 is a Frame, 10 is a center retainer, 11 is a coupling cone, 12 is a collar thereof, 13 is a flat plate diaphragm, 14 is an edge, 1
Reference numeral 5 denotes an outer peripheral portion thereof, 16 a flat outer peripheral portion of the frame 9, and 17 a prepared diaphragm, which are the same as those of the conventional example. 18 is a bobbin spacer. Reference numeral 19 denotes a ribbon spacer, which has a simple rectangular shape as shown in FIG. 3. This is a metal or plastic film with a thickness of about 100 μm to 200 μm, and its thickness varies depending on the voice coil diameter of the target speaker unit. length is 200
Around mm is appropriate. Reference numeral 20 denotes a through hole made in the coupling cone 11 into which one end of the ribbon spacer 19 is inserted.

A method of manufacturing the flat speaker of this embodiment configured as described above will be described below.

First, the field part 1 and the frame 9 are joined. Next, the center holder 10, the voice coil bobbin 7, and the coupling cone 11 are joined together to form a prepared part, and then the bobbin spacer 18 is placed over the center pole 3, and the voice coil bobbin 7, which is the prepared part, is placed over the center pole 3.
into the outer periphery of the bobbin spacer 18. At the same time, the outer periphery of the center holder 10 is fixed to the frame 9. After that, the bobbin spacer 18 is removed. Next, one end of the ribbon spacer 19 is inserted into the gap between the inner periphery of the voice coil bobbin 7 and the outer periphery of the center pole 3, and the other end is inserted into the through hole 20 of the coupling cone 11. The spacers 19 are approximately
It is appropriate to either make three pieces, shifted by 120 degrees, or make four pieces, shifted by 90 degrees from each other. Next, the diaphragm 13 and edge outer periphery 15 of the prepared diaphragm 17 are fixed to the coupling cone collar 12 and the frame outer periphery 16, respectively. Thereafter, the ribbon spacer 19 is pulled out from the through hole 20 of the coupling cone 11.

Of course, it is also possible to assemble only the ribbon spacer 19 from the beginning without using the bobbin spacer 18 at all.

As described above, according to this embodiment, gap rubbing defects are greatly reduced by inserting a plurality of ribbon spacers 19 after removing the bobbin spacer and removing them after installing the prepared insertion plate 17. can do.

Furthermore, the ribbon spacer 19 can be realized at a very low cost since it is only necessary to cut a plastic film of an appropriate thickness into strips.

Effects of the Invention In the present invention, a prepared drive unit consisting of a voice coil bobbin, a center holder, and a coupling cone having a through hole is inserted into a field unit with a frame using a bobbin spacer as necessary, and then the center pole Insert one end of a strip-shaped ribbon spacer between the voice coil bobbin and the voice coil bobbin, pull out the other end from the through hole of the coupling cone, and join the edged flat diaphragm to the rim of the coupling cone and the outer periphery of the frame. By pulling out the ribbon spacer from the through hole of the coupling cone, it is possible to realize an excellent method for manufacturing a flat speaker, which has the effect of greatly reducing gap rubbing defects.

Furthermore, the ribbon spacer has the advantage of being very inexpensive because it only requires cutting a plastic film or metal sheet of appropriate thickness into strips.

[Brief explanation of the drawing]

FIG. 1 is an exploded sectional view showing a conventional method for manufacturing a flat speaker, FIG. 2 is a sectional view showing a method for manufacturing a flat speaker according to an embodiment of the present invention, and FIG. 3 is a plan view of a ribbon spacer. DESCRIPTION OF SYMBOLS 1... Field part, 3... Center pole, 7... Voice coil bobbin, 9... Frame, 10... Center holder, 11... Coupling cone, 12...
... Coupling cone outer rim, 13... Flat plate diaphragm, 14... Edge, 15... Edge outer rim, 16... Frame outer rim, 17... Prepared flat plate diaphragm, 18... Bobbin spacer , 19
...Ribbon spacer.

Claims (1)

[Claims] 1. After inserting a prepared drive unit consisting of a voice coil, a center holder, and a coupling cone with a through hole into a field unit with a frame, a belt-shaped belt is inserted between the center pole and the voice coil bobbin. Insert one end of the ribbon spacer, pull out the other end from the through hole of the coupling cone, and join the edged flat diaphragm to the collar of the coupling cone and the outer periphery of the frame, then insert the ribbon spacer into the coupling cone. A method for manufacturing a flat speaker, characterized in that the speaker is extracted from a through hole. 2. After inserting the prepared drive unit consisting of the voice coil, center holder, and coupling cone with a through hole into the frame-equipped field unit using a bobbin spacer, insert a belt-shaped ribbon between the center pole and the voice coil bobbin. 2. The method of manufacturing a flat speaker according to claim 1, further comprising inserting a spacer. 3. The method of manufacturing a flat speaker according to claim 1, wherein the ribbon spacer is a plastic film. 4. The method of manufacturing a flat speaker according to claim 1, wherein the ribbon spacer is made of metal.