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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a flat diaphragm for a speaker used in various acoustic devices. The
structure of the prior art and its problems The material of the core material of the conventional
flat diaphragm for a speaker is generally aluminum, and in addition, mica composite, polymer
resin, etc. have been used. However, these have the following problems. ■ The density is 2.7 # /
i for aluminum and 1.9g / dl for mica (epoxy). ■ The cost of materials is high. ■ I can not
change the core shape freely. Because of the above three problems, in the frequency
characteristic, the sound pressure level (dB) is low, there is no freedom of design, and the cost is
increased, so it is difficult to use the core material as a spread type flat diaphragm there were.
SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional
problems and has a low density, high mechanical strength, excellent heat resistance and moisture
resistance, and fixed core shape in an arbitrary shape. It is an object of the present invention to
provide a method of manufacturing a flat diaphragm for speakers, which is inexpensive and
inexpensive. SUMMARY OF THE INVENTION In order to achieve the above object, the present
invention is to impregnate a thermosetting resin in a state in which a paper-honeycomb core is
formed into an arbitrary shape, and then heat curing the resin. This paper is lightweight, has a
large mechanical strength, and is moisture resistant by using a low density, low cost base and by
using this paper to form a no nick structure and using a thermosetting resin. Thus, it is possible
to obtain a flat diaphragm for a speaker which is excellent in heat resistance and heat resistance.
Description of Embodiments Hereinafter, an embodiment of a method of manufacturing a flat
diaphragm for a speaker according to the present invention will be described with reference to
FIGS. 1 to 6. First, the adhesive agent 2 is applied to the bonding portion shown in FIG. Then, as
shown in FIG. 1C, they are laminated and pressure-bonded to obtain a laminate 3. Next, as shown
in the first plan, the laminate 3 is cut at the height of the core to obtain a Veno-no-Nickam core 4.
Next, as shown in FIG. 1E, the base, + -nonamic core 4 is expanded in an arbitrary shape, and as
shown in FIG. 1F, the paper honeycomb core 4 expanded in the thermosetting resin 6 is soaked
and impregnated. Then force dry to fix the shape. Next, as shown in FIG. 1G, the surface skin 7 is
heat bonded to both sides of the paper honeycomb core 40 whose shape is fixed via the hot melt
adhesive film 6 as shown in FIG. 1H. The flat diaphragm 8 is to be obtained.
Next, the method of determining the shape and fixing the shape of the paper honeycomb core
will be described in detail. In the case of a base plate diaphragm, nodes always occur when
resonating. Since the shape and size of this nodal circle are determined by the dimensions X and
Y of the honeycomb as shown in FIG. 2, it is possible to arbitrarily change the shape of the
dimensions x and Y of the core when designing. It means that you can do it. It is the process
shown in FIGS. 3 to 6 to determine the dimensions X and Y of the core. First, as shown in FIG. 3,
the paper honeycomb core 4 is hooked to the fixing pin 9, and the moving pin 1o is hooked to
the opposite side. Next, as shown in FIG. 4, the moving pin 1o moves to a specified size and stops.
Next, as shown in FIG. 5, it is dipped in a container containing the thermosetting resin 5 as it is,
and finally, as shown in FIG. The honeycomb core 4 is heat-treated in a drying furnace 11 to fix
the paper- nick core 4 in a shape as defined. The flat diaphragm for a speaker obtained as
described above obtains the characteristics as shown in FIG. 7 by the impregnation rate of the
thermosetting resin. As shown in FIG. 7, when the impregnation rate of the thermosetting resin is
less than 25%, both the mixed oil compressive strength and the compressive strength have low
values, and when it is larger than 30 T, both strengths become high but the density also becomes
There is a problem that the cost becomes high as well as the cause of the characteristic
deterioration. From the above, it is considered that 25 to 30% of the impregnation rate of the
thermosetting resin with respect to the mass of the paper honeycomb core is optimum. Since the
core material is constructed, it is a dog of industrial value by obtaining a core which is low in
cost, light in weight, excellent in moisture resistance and heat resistance, and excellent in
mechanical strength.
Brief description of the drawings
1A to 1H are process drawings showing a method of manufacturing a flat plate diaphragm for a
speaker according to an embodiment of the present invention, and FIGS. 2 to 6 are process
drawings of the core shape in the manufacturing method. FIG. 7 is a characteristic diagram of a
diaphragm obtained by the same manufacturing method.
2 · · · · · · · · · · · · · · · · · · · · · · · paper honeycomb core, 5 · · · · · · · thermosetting resin. Name of Agent
Attorney Nakao Toshio Other 1 person Figure 1 Figure 2 Figure 3 Figure 4
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