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The present invention relates to a diaphragm for a speaker. 1) For the f speaker: F. a till plate, it
is required to be light in characteristics, to have a large Young's modulus, to have an
appropriately large internal loss, and the like. Paper, resin, total bending, etc. can be mentioned.
Heretofore, in a speaker diaphragm manufactured using these materials, they are used as a
mixture with other materials in order to exhibit the characteristics of the individual materials and
compensate for the defects. For example, in the case of a paper diaphragm made mainly of a
wood valve, glass fiber or collagen is mixed into the valve for paper making to improve heat
resistance and moisture resistance, or carbon fiber is mixed to obtain Young's modulus and heat
resistance. It is known that the quality has been improved. Also, in the speaker diaphragm using
a fiber reinforced composite material, for example, a plate mixed with carbon II and a plate mixed
with carbon imm and a plate mixed with carbon imm are impregnated with a thermosetting resin
and dried. Also known are those that are cured. Besides, although mixed with alumina fibers,
boron nitride fibers and silicon carbide fibers have been developed, the materials themselves are
expensive and generally not accepted. It is an object of the present invention to solve the abovementioned drawbacks of the diaphragm and to provide a light and highly rigid diaphragm. The
speaker diaphragm of the present invention comprises one synthetic resin selected from
polyimide resin, polyamide resin and epoxy resin and needle crystals of one substance selected
from silicon carbide, silicon nitride and boron. It is characterized by comprising a substrate
formed by kneading and a vapor deposition layer covering at least one main surface of the
substrate. ! Below, an embodiment of the present invention will be described based on the
attached drawings. FIG. 1 is a cross-sectional view of the speaker diaphragm 1 of the present
embodiment, showing a cone-shaped one. Besides this, it is possible to form a dome shape. FIG. 2
is an enlarged cross-sectional view of a portion shown in a circle of FIG. 1. The diaphragm 1 is
formed of a diaphragm substrate 2 and a vapor deposited layer 3 of beryllium covering both
main surfaces of the substrate. The diaphragm substrate 2 is composed of a resin portion 5 made
of a polyimide resin and needle crystals 4 of silicon carbide dispersed uniformly in the resin
portion, and the polyimide resin and needle crystals of silicon carbide are kneaded to form a cone
shape. It is molded into a shape. Silicon carbide is used as needle crystals 4. However, the needle
crystals constituting the diaphragm substrate itself are excellent in heat resistance, mechanical
strength, hardness are large, chemically stable and corrosion resistance is good. It has the feature
Instead of silicon carbide, silicon nitride or boron can be used, and those needle crystals having a
length of 10 μm to 200 μm and a diameter of 0.05 μm to 0.5 μm are preferable. Although
polyimide resin is used as resin which forms the resin part 5, polyamide resin or an epoxy resin
can be used elsewhere. In the manufacturing process of the speaker diaphragm of the present
embodiment, first, after kneading 10 wt% to 30 wt% of needle crystals 4 and 7 Q wt% to 90 wt%
of resin part 5 as a diaphragm substrate in a mixer , To form a continuous plate-like sheet. The
sheet is formed into a cone shape or a dome shape by heat and pressure forming or the like to
obtain a diaphragm substrate. At this time, it is possible to obtain a diaphragm substrate by
extrusion injection molding immediately after kneading. Thereafter, beryllium is vapor deposited
by vacuum vapor deposition over the entire surface of the cone-shaped diaphragm substrate to
form a vapor deposition layer, whereby the diaphragm of this embodiment can be obtained. Here,
beryllium is used as steam 11i, but a similar imaging plate can be obtained by vacuum
evaporation of a material such as aluminum or boron on at least one main surface of the
diaphragm substrate. The following table shows the results of comparison of the diaphragms of
the present example consisting of the beryllium vapor deposited layer, the needle carbide of
silicon carbide and the polyimide resin portion obtained and the diaphragms of the conventional
material alone in terms of physical property values. As is clear from the table, it can be seen that
this embodiment is a light and high-rigidity imaging plate that has increased elastic modulus and
speed of sound while suppressing an increase in specific gravity compared to a conventional
diaphragm made of only polyimide resin. . In addition, since the polyimide resin and silicon
carbide are mainly used, the heat resistance is excellent. According to the present invention, a
diaphragm having high mechanical strength and hardness, high heat resistance, and high
chemical resistance and high corrosion resistance can be obtained according to the present
invention. Heat resistance improves by providing in at least one main surface. Furthermore, by
raising the upper limit frequency upper limit in the sound pressure frequency characteristic, it is
possible to obtain a speaker diaphragm with less split vibration.
Brief description of the drawings
FIG. 1 is a cross-sectional view of the speaker diaphragm of the present embodiment, and FIG. 2
is an enlarged cross-sectional view of a portion shown by a circle A in FIG.
Description of the sign of the main portion 1 ......... diaphragm 2 ...... diaphragm body 3 ...... steam
@ layer 4 ...... needles 5 .... · · Resin part
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