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JPS57184398

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DESCRIPTION JPS57184398
Description 1, title of the invention
Speaker structure
3. Detailed Description of the Invention The present invention relates to a fixing structure of a
diaphragm and a frame in a speaker. The speaker has a high sound pressure, good frequency
characteristics over a wide band, low power consumption, low processing cost, good
assemblability, and in the case of a watch or small electronic device, It is required to be small and
thin. In particular, in the case of a wristwatch, it is necessary to reduce the size and thickness,
and at the same time to improve the sound pressure and improve the frequency and frequency
characteristics with low power consumption, and the environment resistance such as heat
resistance, cold resistance and humidity resistance, vibration resistance, impact resistance. In
order to improve waterproofness, anti-perspirant properties etc., various contrivances have been
made structurally, but even if a product with good performance in trial production can be made,
there are many that are expensive and problematic in terms of cost. A watch with a built-in
speaker has not been commercialized yet, but has been prototyped at the laboratory level. FIG. 1
is a cross-sectional view showing a structural example of a conventional watch speaker. A magnet
2, an upper yoke 6, and a lower yoke 4 are incorporated in the frame 1. The voice coil 6 is
adhered to the diaphragm 5, and the terminal thereof is connected to the terminal electrode
sheet 7 and soldered. The frame 1 and the diaphragm 5 are fixed by an adhesive 8. However,
because it is difficult to supply the adhesive uniformly, whether manually or automatically, the
adhesive application work makes the adhesive surface between the frame 1 and the diaphragm 5
uneven. In some cases, the frequency characteristics were broken, and sometimes the adhesive
surface was broken to cause a defect in waterproofness. In addition, when using an adhesive,
there is a problem in cost because the assemblability is deteriorated by EndPage: 1. In addition,
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although fixation by laser welding has been reported in order to solve cost problems, in the case
of a thin diaphragm made of a transparent plastic or a semitransparent thin film, in the case of a
thin diaphragm made of a metal, there is no precedent in the wristwatch. No, there have been no
reports of experiments in other product areas. An object of the present invention is to reduce the
influence of such conventional problems, obtain frequency characteristics with less variation, and
mass-produce speakers having a structure that is advantageous in cost. This invention makes it a
summary to weld a transparent or semitransparent plastic small part by a carbon dioxide gas
laser. FIG. 2 is an embodiment of the speaker according to the present invention, and is a crosssectional view showing the structure. A magnet 2, an upper yoke 6, and a lower yoke 4 are
incorporated in the frame 1. The voice coil 6 is adhered to the field moving plate 5, and the
terminal thereof is connected to the terminal electrode sheet 7 and soldered.
The outer peripheral portion of the frame 1 and the outer peripheral portion of the diaphragm 5
are fixed by a laser welding portion 9 by a carbon dioxide gas laser welding method. The material
of the frame 1 is required to have good laser weldability with the diaphragm 5, but in the
embodiment, a sheet of transparent or translucent polyarylate resin is used as the material of the
diaphragm 5. Further, as the material of the frame 1, it is desirable that the melting point be
close to that of the diaphragm 5, and the same polyarylate resin or polycarbonate was selected
and used. This laser welding is to melt and join the contact surface between the diaphragm 5 and
the frame 1 by heating with a carbon dioxide gas laser beam of continuous oscillation output of
about 10 to 20 W, and the bonding force is extremely strong. In general, since plastic absorbs
the 10.6 μm wavelength of carbon dioxide gas laser well, there have been reports of use for
cutting and the like. At the time of laser welding, it is necessary to move in a state where the
diaphragm 5 and the frame 1 which are objects to be welded are positioned so that the outer
periphery of the diaphragm 5 is welded. Sometimes, the width of the laser welding portion 9
becomes uniform by blowing an inert refrigerant gas such as fluorocarbon gas, for example. As
described above, the frequency characteristics become stable as compared with those adhered
using the adhesive 8, and a product having no problem in waterproofness can be produced. Also,
the assembly at the time of manufacture can be performed by automatically irradiating the laser
beam from the top only by stacking and placing it on the plate-like positioning jig which doubles
as the transport container. And then glue the diaphragm 5, and then reduce the number of steps
as much as 1/3 to 115 in comparison with the manual correction of the irregular bonding area. It
became extremely advantageous in terms of cost.
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view showing an example of the
structure of a conventional watch speaker, and FIG. 2 is a cross-sectional view showing the
structure of the speaker according to the present invention. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · diaphragm · 6 · · · ----- voice coil 7 ......... terminal
electrode sheet, 8 ...... adhesives, 9 ...... laser welds applicant Citizen Watch Co. EndPage: 2
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