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TECHNICAL FIELD The present invention relates to a speaker used for various audio devices. The
configuration of the prior art and its problems In general, the speaker is configured as shown in
FIG. That is, the frame 6 is coupled to the magnetic circuit 6 formed by incorporating the ring
magnet 3 and the ring upper grate 4 on the plate 2 having the center ball 1, and the diaphragm
60 together with the gasket 7 at the periphery of the frame 60 The outer periphery of the edge
of 8 is bonded by bonding, and a voice coil 10 of 19 is connected to the central portion of the
diaphragm 8 without eccentricity to the magnetic gap 9 of the magnetic circuit 5. The middle
portion of o is held by a damper 11, and a dust camp 12 is incorporated on the upper surface of
the central portion of the diaphragm 8. In such a speaker, as shown in FIG. 2, the conventional
gasket 7 has a good appearance on the surface of the gasket body 7a obtained by punching a
cardboard laminated on the side layer with a mold. A glossy high density surface layer was
laminated and configured. In the gasket 7, the hygroscopicity of moisture in the air differs
between the gasket body 7a and the surface layer 7b, and when the gasket 7 is attached to the
outer peripheral portion of the edge of the diaphragm 8, the above-mentioned moisture
absorption occurs. The deformation as shown in FIG. 3 is caused by the difference in the
expansion ratio due to the difference in the properties, which makes the diaphragm 8 defective,
and when the deformed one is incorporated into the frame 6, to the frame 6 of the diaphragm 8.
The bonding is not completely performed, causing a bonding failure, and even after bonding to
the frame 6, there is a major problem that the bonding is peeled off due to the deformation due
to the warpage of the gasket 7. SUMMARY OF THE INVENTION The present invention eliminates
the above-mentioned conventional drawbacks, and provides a loudspeaker in which the gasket is
improved, deformation due to moisture absorption is eliminated, and the diaphragm is firmly
adhered to the frame. The purpose is to SUMMARY OF THE INVENTION In order to achieve the
above object, the speaker according to the present invention has the peripheral portion of the
frame coupled to the magnetic circuit coupled with the outer peripheral portion of the
diaphragm together with the gasket having the low hygroscopic material laminated on the front
and back surfaces, A voice coil that fits into the magnetic gap of the magnetic circuit is coupled
to the diaphragm, and by this configuration, the gasket hardly absorbs moisture in the air, and
hence there is no deformation and the edge of the diaphragm is outer periphery The adhesive
bond between the part and the frame can be stable. DESCRIPTION OF THE PREFERRED
EMBODIMENT An embodiment of the present invention will be described below with reference to
FIGS. 4 and 6.
The configuration of the speaker is substantially the same as that shown in FIG. 1, and the
description thereof is omitted. Here, only the gasket as a feature of the present invention will be
described. The gasket 7 in the present invention, as shown in FIG. 4, is a material having poor
hygroscopicity on the surface and the back surface of a gasket body 7a formed by punching a
board made of laminated layers in multiple layers. It is configured by laminating 7a and 7c. This
hygroscopic poor material 7b. As 7C, a high density paper, or a paper impregnated with a
polyvinyl resin, a nylon resin or the like is used. With this configuration, the hygroscopicity of the
gasket 7 on both the front and back surfaces is deteriorated to the same extent, so that the
expansion and contraction ratio due to moisture on both surfaces is the same, and as a result, it
does not deform as a result. The gasket 7 is adhered to the edge of the edge of the diaphragm 8
as shown in FIG. 6, and it does not deform even if it is absorbed by the housing incorporated in
the frame 6 and adhesion to the edge of the edge of the diaphragm 8 is also It will surely be
done. Further, adhesion to the frame 6 can be stably performed, and since there is no
deformation of the gasket 7 even after being assembled, peeling of the adhesion to the frame 6
does not occur, and it becomes extremely stable in quality. Effects of the Invention As described
above, the speaker of the present invention uses a gasket having a low hygroscopic material
laminated on the front and back surfaces, so it does not deform even if it absorbs moisture in the
air, and adheres to the diaphragm In addition, it is possible to maintain the stable state of
coupling of the outer peripheral portion of the diaphragm to the frame of the diaphragm and to
make the one extremely excellent in quality, and further to improve the appearance quality as a
gasket. Of great value.
Brief description of the drawings
1 is a half sectional view showing a general speaker, FIG. 2 is a sectional view of a gasket of a
conventional speaker, FIG. 3 is a sectional view showing the deformed state of the same gasket
due to moisture absorption, and FIG. FIG. 6 is a cross-sectional view of the gasket in one
embodiment of the speaker of FIG.
5 ...... magnetic circuit, 6 ...... frame, A ..... gaskets, 7a ...... gasket body, 7b, poor Ryo C .....
hygroscopic Materials, 8 ... diaphragms, 9 ... magnetic gaps, 10 ... voice coils. Name of Agent
Attorney Nakao Toshio Other 1 person Figure 3 Figure 4 Figure 5
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