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JPS5788392

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DESCRIPTION JPS5788392
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a general flat
speaker, FIG. 2 is a partially cutaway top view of the speaker diaphragm of the present invention,
and FIG. 3 is a part of another embodiment. FIG. 4 is a sound pressure frequency characteristic
diagram of a speaker using the speaker diaphragm of the present invention and the prior art. 14
ииииии Core material, 15.16 иииииии Skin material.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flat-plate
speaker diaphragm used for a flat speaker, and in particular, a highly efficient flat characteristic
as a speaker using a composite mica impregnated with resin and hardened as a core material. It
is an attempt to provide what is obtained. Recently, a flat speaker as shown in FIG. 1 has been
developed. That is, the frame 6 is coupled to the magnetic circuit 5 constituted by the plate pole
2 having the center pole 1, the ring-shaped magnet 3 and the ring-shaped 7 upper plate 4, z, ii at
the peripheral portion of the frame 6 "The edge 1o bonded to the peripheral portion of the flat
diaphragm 9 constituted by bonding the skin material 8 to the surface of the 2 core 7 is fixed,
and the voice coil 11 is coupled to the lower surface of the flat diaphragm 9; The middle portion
of the voice coil 11 is held by the damper 12 and the lower portion of the voice coil 11 is fitted
to the magnetic cap 13 of the magnetic circuit 6 without eccentricity. In such a speaker, as the
conventional flat-plate-shaped diaphragm 9, aluminum foil is used as the core material 7 to form
a large number of honeycomb-like cavities continuously, or an image-shaped one is used.
Therefore, aluminum foil has the disadvantage of high specific modulus of elasticity CE / ??)
and small internal loss, and the resonance Q of the material is high, especially the peak of highfrequency resonance is high, and the specific gravity is relatively heavy at 2 и 7. There was also a
disadvantage that it would be disadvantageous as well. The present invention seeks to eliminate
the above-mentioned conventional drawbacks. An embodiment of the present invention will be
described below with reference to FIGS. 3 First, in FIG. 2, 14 is a honeycomb-shaped core
material. This core material 14 is formed by impregnating a laminated mica sheet with a resin
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such as an epoxy resin and curing it into a strip, and a plurality of these are adhered partially
While laminating, it is made to have a structure in which a large number of hexagonal spaces are
continuously formed by expanding it in a disk shape around one end. A skin material 15.16 such
as aluminum foil is attached to the surface of the core material 14. The core material 14 shown
in FIG. 3 is formed by arranging in the form of a tape the tape-like structure in which resin is
impregnated and cured in a laminated mica sheet, and the skin material 15 is applied to the
surface of the core material 140 in the same manner as described above. .16 is pasted and
constituted. The core mica 14 is composed of 70 to 8 ░ wt% of mica and 20 to 3owt% of resin.
The internal loss is large, the specific gravity is small as 1.48, light weight 2, high rigidity. is
there. ,) It is also possible to use the core material 14 after curing it completely и и '' Mica
impregnated with resin impregnated resin can be used for core material 14, or using the skin
material 15 and 16 in the form of a prepreg condition to adhere by heating It can also be fully
cured at the same time as the agent is cured.
The sound pressure frequency characteristics of a flat speaker using such a flat diaphragm are as
shown by the solid line in Fig. 4 and compared to the characteristics shown by the broken line of
a flat speaker using a flat diaphragm with an aluminum core material. It can be flat. As described
above, since the speaker diaphragm of the present invention is configured, the efficiency can be
improved by weight reduction, and the characteristic of high frequency resonance can be
reduced to make the characteristic flat as a whole. Yes, it is of great practical value.
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