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JPS6046196

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DESCRIPTION JPS6046196
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
lightweight and highly rigid loudspeaker diaphragm among the diaphragms for loudspeakers.
The structure of the prior art and the problems thereof FIGS. 1, 2 and 3 respectively show a
speaker diaphragm of a conventional sandwich structure. As shown in FIG. 4, the conventional
diaphragm for speakers shown in FIG. 4 cuts the expanded honeycomb core 22 Beno, which is
obtained by linearly expanding the honeycomb core material 1 in the directions of arrows A and
B, into a circle. A circular surface material 3 is adhered to the upper surface and the lower
surface. Note that the core core material 1 shown in FIG. 4 is obtained by laminating metal foils
such as aluminum foil and bonding metal foils adjacent to each other at necessary places, and
this honeycomb core material 1 is laminated with metal foils. When stretched in the directions A
and B, as shown in FIG. 1, a honeycomb core 2 in which hexagonal cells are arranged vertically
and horizontally is formed. In the conventional speaker diaphragm shown in FIG. 2, as shown in
FIG. 5, the honeycomb core material 1 is oriented in the directions of arrows C and D so that the
? side portion is the center and the other side portion is the outer peripheral portion. The
circular surface material 3 is adhered to the upper surface and the lower surface of a circular flat
plate-like expanded honeycomb core 4 formed by rotating and expanding both surfaces. In this
conventional example, the cells of the honeycomb core 4 are symmetrical with respect to the
central axis of the diaphragm. In the conventional example shown in FIG. 3, a long metal foil 6
such as an aluminum foil is alternately bent on the central portion side and the outer peripheral
portion side of a circle to form a core 6 by forming a core 6. A circular surface material 3 is
adhered to the upper surface and the lower surface. In general, the main items required for the
speaker diaphragm are (a) high rigidity and that the frequency at which the split resonance of
the diaphragm occurs is out of band. (B) To be highly efficient and lightweight. Etc. However, as
the core material and the surface material of the conventional speaker diaphragm shown in FIG.
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1, FIG. 2 and FIG. 3, metal foil, particularly aluminum foil is used, compared to the conventional
cone diaphragm. Although it is highly rigid, it can not be said to be sufficiently lightweight in
terms of weight, and it has a drawback that high efficiency regeneration can not be performed.
The object of the present invention is to eliminate the above-mentioned conventional drawbacks,
and it is an object of the present invention to provide a lightweight and highly rigid speaker
diaphragm. According to the present invention, there is provided a diaphragm for a speaker of a
sand-inch structure, in which a surface material made of foil is adhered to the surface of a core
made of foil, as a foil for the core or a foil for the surface material. It is a configuration using a
foil in which a light weight and high rigidity metal layer is formed on at least one side of a
molecular film, thereby providing a light weight and high rigidity speaker diaphragm.
Description of the Embodiments One embodiment of the present invention will be described
below. The feature of the present invention lies in the foil constituting the surface material of the
core material 9. The foil used for the diaphragm of this invention is FIG. As shown in FIG. 7, a
lightweight and highly rigid metal is deposited on both sides or one side of a lightweight polymer
film 7, or a lightweight, highly rigid metal foil 8, 9 is laminated. As the polymer film 7, a polymer
film such as polyester resin, polyamide resin, polyimide resin, etc. is used, and as the metal or
metal foil deposited or bonded to the polymer film 7, aluminum, boron, Use beryllium etc. Thus, a
foil having a sand-inch structure in which the metal layer 8.9 is formed on both sides of the
polymer film 7 is used as the core 5-7 and / or as a surface material, or a metal on one side of
the polymer film 7 When the foil of the canappe structure in which the layer 8 is formed is used
as a core material and / or as a surface material, a lightweight and highly rigid diaphragm can be
obtained. For example, in order to obtain the same rigidity as an aluminum foil having a
thickness of 2 .mu.m, aluminum may be deposited by about 2.5 .mu.m on both sides of a
polyimide film 7 having a thickness of 10 .mu.m. In this case, according to the weight ratio of the
two, according to the present embodiment, it is possible to obtain the same degree of rigidity
with about half of the foreground compared to the conventional example, and a high rigidity and
light weight vibration A board is obtained. As described above, according to the present
invention, it is possible to obtain a highly rigid and lightweight diaphragm.
[0002]
Brief description of the drawings
[0003]
1 to 3 are top views showing a part of the conventional speaker diaphragm with a notch, and FIG.
4 is a perspective view showing a method for expanding the honeycomb core material of the
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diaphragm shown in FIG. FIG. 5 is a perspective view showing a method of expanding the
honeycomb core material of the diaphragm shown in FIG. 2, FIG. 6 is a perspective view of a foil
used for a speaker diaphragm in one embodiment of the present invention, and FIG. It is a
perspective view of the foil used for the other Example of invention.
7 ииииии Polymer film, 8, 9 иииииииии Metal layer. Name of Agent Attorney Nakao Toshio and others 1
person Figure 1 Figure 2 Figure 3 ? Figure 4 A
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