JPS61108296

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DESCRIPTION JPS61108296
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm for a sandwich structure in which a skin material is adhered to the surface of
a lightweight and highly rigid core material used for a speaker. Configuration of the Conventional
Example and its Problems In recent years, the mainstream of the diaphragm of the speaker has
been cone type to flat type, and there are several methods for the method of flat type diaphragm,
among which plastic film is used as core material From the performance and productivity, the
most rational diaphragms are the ones that are formed and the skin material is glued on both
sides and the skin material is attached 172 A-. Hereinafter, a conventional speaker diaphragm
will be described. FIG. 1 is a perspective view of the central portion of the core member of the
conventional speaker diaphragm, in which 1 is a lip bonding portion and 2 is a central flat
portion. FIG. 2 is a cross-sectional view of the central portion of the speaker diaphragm, in which
3 is a front side skin material, 4 is a back side skin material, 5 is a core material, and 6 is a hot
melt adhesive. The core material 6 is a plastic film which is heated and then press-formed or
vacuum-formed, and the area of the center of the mold structure, which is the two radial lip
assembly points, is wider than the lip width. When the core material 6 is bonded to the skin
material, the hot melt adhesive 6 is applied or affixed in advance to the surface of the skin
material to be bonded to the core material, as shown in FIG. The hot press is performed from the
top and the bottom to bond. At this time, since the central portion of the core member 6 has a
larger area than the bonding width of the radial lip, the difference in linear expansion coefficient
is caused by the difference in the materials of the core member 6 and the skin member in the
state of normal temperature after heating. Will cause the skin to warp and create a dent as the
appearance. As a result, there is a problem that a dimple-like depression is generated at the
center of the diaphragm, which is an appearance of the speaker, and the commercial value is
significantly reduced. SUMMARY OF THE INVENTION The object of the present invention is to
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solve the above-mentioned conventional problems, and it is an object of the present invention to
provide a speaker diaphragm having 1.4 which can eliminate the shadow of the diaphragm which
is important as the speaker appearance. is there. Configuration of the Invention The present
invention is a speaker diaphragm including a core member having a structure in which the
central portion is not joined to the front side skin and an adhesive for joining the front skin and
the old core and the back skin respectively. When a core material obtained by applying an
adhesive or pasting a skin material and a plastic film is formed in a sandwich shape and hot
pressed from above and below to bond, the wide surface of the core material is joined to the
surface skin material Since the structure does not have such a structure, it is possible to eliminate
the pitting phenomenon of the appearance of the speaker diaphragm due to the difference in
linear expansion coefficient.
DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 3 is a perspective view of the core in the
core of the speaker diaphragm in one embodiment of the present invention, in which 7 is a rib
bonding portion, 8 is a central flat portion and a wide surface of the central portion. Shows a
state in which the height of the core material is lowered so as not to be bonded to the front side
skin material. FIG. 4 is a cross-sectional view of a central portion of the core material of this
example attached as a speaker diaphragm. In FIG. 4, 3 is a skin material of Table 1111, 4 is a
back surface skin material, 6 is a real adhesive, and 9 is a core material. The operation of the
speaker diaphragm configured as described below will be described below. First, a hot-melt
adhesive 6 'is applied or stuck to the surface of the front side skin 3 and the back side skin 4 to
be bonded to the core 9, and it is sand-in shaped with the core 9 from the top and bottom. Heat
pressing is performed, and only the rib bonding parts arranged in the contact radial direction are
adhered, and the wide surface of the core central part is not bonded to the front side skin
material 3, so the depression of the front side skin material 3 It will not occur. As described
above, according to the present embodiment, the depression of the diaphragm, which is
important as the appearance of the speaker, can be eliminated by indenting the wide surface of
the central portion of the core member so as not to join the front side skin member. In addition
to the bending strength in the radial direction of the diaphragm, by providing the step in the
center of the core member, the strength can be further improved and the rigidity can be
increased. In addition, not only when the wide surface of the central part of the core member 6 of
this embodiment is at the middle position of the core material height, but also when it is joined to
the back side skin member, the diaphragm appearance intended by the present invention It goes
without saying that it is possible to eliminate the hollow of the. In this case, it is also possible to
make a hole in the back side skin material in the case of bonding to the back side skin material
and not to make a joint. According to the present invention, it is possible to eliminate the
depression of the diaphragm which is important as the appearance of the speaker by not joining
the central portion of the core member of the speaker diaphragm with the front side skin
material, and to prevent vibration. It is possible to realize a superior loudspeaker diaphragm
which can be made more rigid even in the radial bending strength of the plate.
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a perspective view of a conventional plastic core material central portion, FIG. 2 is a
cross-sectional view of a central portion of a speaker diaphragm using the conventional core
material, and FIG. 3 is a speaker according to an embodiment of the present invention FIG. 4 is a
perspective view of the central portion of the core material of the diaphragm, and FIG. 4 is a
cross-sectional view of the central portion of the loudspeaker diaphragm.
3 · · · Front side skin material 4 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Center flat portion .... Rib material.
Name of Agent Attorney Nakao Toshio Other 1 person Figure 1 J6 Figure 3 Figure 4
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