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JPS5788389

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5788389
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a general
speaker, FIG. 2 is a top view of a flat diaphragm used in a conventional speaker, FIG. 3 is the
same cross-sectional view, and FIG. FIG. 5 is a top view of a flat diaphragm in an embodiment of
the speaker according to the invention, FIG. 5 is a cross-sectional view taken along the line A- 0 B in FIG. 4 and FIG. 5 и и и Magnetic circuit, 6 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и voice coil, 11 ииииии Magnetic gap, 15 ииииии Core material, 16 ░ 17 ииииии Skin
material, R1, R2 иииииииииииииииииии.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker using a
flat diaphragm formed in a square shape by bonding a skin material to the surface of a core
material, and improves the quality by increasing the peel strength of the skin material. It is
something to try. In general, a speaker using a flat diaphragm is configured as shown in FIG. ? ?
?? A frame 6 is coupled to a magnetic circuit 5 constituted by a plate 2 having a center pole 1,
a ring-shaped magnet 3 and a ring-shaped upper plate 4 and a flat diaphragm at the periphery of
the frame 6. The peripheral edge of the second blade 8 coupled to the peripheral edge of 7 is
coupled, the voice coil 9 is coupled to the lower surface of the planar diaphragm 7, the middle
portion of the voice coil 9 is held by the damper 10 The magnetic gear knob 11 of the magnetic
circuit 5 is configured to be fitted so as not to be eccentric. Among such loudspeakers, a large
number of loudspeakers in which the peripheral portion of the frame 6 has a rectangular shape
and the planar diaphragm 7 has a rectangular shape have been developed. As the planar
diaphragm 7 used in the conventional speaker of this type, as shown in FIGS. 2 and 3, upper and
lower surfaces of a square core material 12 such as a honeycomb core made of a combination of
a foamed resin or metal foil. The skin material 13.14 which consists of high rigidity foils, such as
aluminum, carbon, aluminum, mica, is stuck and it is constituted, and it is constituted so that
outline 3 of core material 12 and skin material 13.14 becomes the same size. . In this manner, in
the square planar diaphragm 7, when it is incorporated as a speaker, a force is applied to the
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attachment portion between the edge 8 and the skin 13, and the adhesion between the skin 13
and the core 12 is removed at a large amplitude. It works particularly strongly when the force is
working, and the four corners of the square and the skin material 13 protrude outside the core
material 12. Therefore, when the outer dimensions of the core material 12 and the skin material
13 ░ 14 are identical to each other, the force applied to the corner is particularly concentrated,
so that the adhesive peeling at the corner is likely to occur, and the adhesion peeling occurs in a
short period of time There is a problem in that the skin material 13 is broken due to the
generation of a sticking noise. The present invention eliminates the above-mentioned
conventional drawbacks. Hereinafter, an embodiment of the present invention will be described
with reference to FIG. 4 to FIG. The entire structure of the loudspeaker is substantially the same
as that of FIG. 1, and only the structure of the flat diaphragm 7 will be described here. A core
material 15 is formed of a lightweight foamed resin or metal and is formed in a rectangular
shape, and the corner of the core material 1504 is provided with a radius of R1.
On the upper and lower surfaces of the core material 15, a skin material 16.17 made of a sheet
of high rigidity such as aluminum, carbon, aluminum resin or mica is adhered by adhesion. At the
four corners of this skin material 16.17, a radius of R2 is provided. The radius R1 of the core
material 16 and the radius R2 of the skin material 16 ░ 17 are configured to have a relationship
of R + <R2, and when the skin material 16.17 is attached to the core material 15, the corners of
the core material 15 are obtained. The corners of the skin material 16.17 are configured so as
not to protrude slightly from the part. When the edge 8 is attached to the flat diaphragm 7
configured in this way to form a speaker as shown in FIG. 1, the edge 8 is made of the core
material 15 and the skin even if the force applied during vibration is concentrated at the corner.
Since the adhesive bonding is performed to both of the members 16, the peel strength change of
the skin member 16 can be increased. Further, the skin material 16.17 does not protrude from
the core material 15 to the outside 6 side, so that the generation of clattering noise at the time of
operation does not occur, and the improvement in characteristics can also be measured. As
described above, since the speaker according to the present invention is configured, separation of
the core material and the skin material at the corner where power is likely to be concentrated
can be prevented even when the amplitude is large, and the skin material is outside the core
material. It is also possible to eliminate the generation of chattering noise and to improve the
characteristics in terms of its practical value.
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