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Description 1, title of the invention
Reversal diaphragm
3. Detailed Description of the Invention The present invention relates to a sound pressure
diaphragm such as a speaker microphone having a high elastic modulus and a high internal loss.
Heretofore, to the sound of high elastic modulus and lightweight speakers ? ? ? ? metals
such as aluminum, titanium, beryllium etc. as materials of diaphragm, CFRP, composite materials
obtained by mixing flake black EndPage: 1 lead with resin, etc. However, these materials have a
small internal n + loss and the sound pressure in the vicinity of the high frequency co-extraction
frequency significantly increases in the reproduction characteristics of the speaker, and the fall
characteristics are not good. -As materials for blade height internal loss, there are paper, plastics,
and their composite materials, but the elastic modulus is low, and high frequency regeneration is
difficult and can not be used over a wide band. The present invention has been made in view of
the above-mentioned problems, and the object of the present invention is a mixed wire material
mainly composed of thermoplastic i??5 + fat, graphite powder and a plasticizer of a relatively
large number of parts. The sound vibration of a speaker, microphone, etc. having the
characteristics of high elasticity and high internal loss by making a film like a film having a
higher elastic modulus than that of the film on one side or both sides of the film formed by To
provide the board. Hereinafter, the details of the present invention will be described together
with the manufacturing method according to the drawings. In FIG. 1 and FIG. 2, 1 is a film of a
two-layer structure formed by thermocompression bonding of the film 3 and the film 4 to
constitute the acoustic diaphragm 2 such as a speaker, a microphone or the like. Among them,
the film 3 has high internal loss physical properties, which can be increased or decreased by
adjusting the mixing amount of the plasticizer. That is, the internal loss is increased by increasing
the content of butyl phthalyl butyl glycolate (hereinafter simply referred to as B, P, B, G) as a
plasticizer. On the other hand, Film 4 has physical properties of high elastic modulus, and the
elastic modulus can be increased by reducing the mixing value of the plasticizer, and the increase
in 4iil property is also possible depending on the thickness and laminated state of film 3.4.
Specific examples of the two-layer film shown in FIG. First, in order to form the film 3, a piece of
thermoplastic wood, such as vinyl chloride, is added to the flake graphite powder and mixed.
Furthermore, relatively large amounts of plasticizers such as B, P, B, and G are added to this
mixed material to form a film 4 using the mixed material by mixing and mixing. PVC resin, lead
stearate as a stabilizer, B as a priming agent. Examples of the combination of P, B and () are as
follows, for example. On the other hand, in order to form the film 4, a heat miscible resin, for
example, vinyl chloride is added to the flake graphite powder in the same manner as the film 3
and mixed.
Furthermore, the elastic modulus is adjusted by adjusting the mixing amount of lead stearate as a
plasticizer to this mixed material. Thereafter, the film 4 is manufactured using the abovementioned mixed material. In this case, examples of the combination of flake graphite powder,
vinyl chloride resin, lead stearate as a stabilizer, and B, P, B, G as a plasticizer are shown below,
for example. Thus, the obtained film 3 of high internal loss and the film 4 of high elastic modulus
are obtained, so the film 4 is polymerized on any one of the upper and lower surfaces of the film
EndPage: 23 to form a hot plate (not shown) The film 1 of 2 и f as shown in FIG. 1 is obtained by
heating the heat plate at about 140 ░ C. and pressing it by placing it on or sandwiching it from
above and below. Physical properties hf of the film 1 of this 2M) become a table shown in the
lower figure. As apparent from Table (1), Table (1), the film 1 of the present invention has the
following characteristics: elastic modulus, sound velocity to metal, and internal loss to paper.
Moreover, the sound pressure frequency characteristics when the desired diaphragm shape, for
example, a cone-shaped diaphragm 2e as shown in FIG. 2 is molded by a pressing method or the
like using the two-layered film 1 of the present invention As shown in FIG. 3, the high-pressure
frequency characteristics (I: I) of the b) and the conventional diaphragm made of synthetic resin
are flatter in the acoustic diaphragm of the present invention. In the above description, the two
films 1 are described, but Ql'l, 7 ((the film 4 of high elastic modulus is crimped on both sides of
the loss film 3 to form a three-layer film (not shown) It has high elasticity like gold 1i + i, and
internal loss is also suitable for paper. Moreover, as a film of a high elastic modulus, high elastic
modulus metal films, such as an aluminum film, a beryllium film, and a titanium film, may be
used. Further, the Young's modulus is improved by about 20% by using a copolymer of vinyl
chloride and 85 wt.% Of vinyl chloride and 15 wt.% Of vinyl acetate in the above-mentioned
example. Furthermore, the diaphragm is not limited to the illustrated cone type, and may be
dome type, flat type, etc. (also applicable. As described above, according to the present invention,
a film having a higher elastic modulus than that of the film is formed on one side or both sides of
a product formed of a mixed wire material mainly composed of a thermoplastic resin, graphite
powder and a relatively large amount of plasticizer. It is characterized by having characteristics
of high elastic modulus and high internal loss.
4 is a cross-sectional view showing a two-layer film to form a groove of the acoustic diaphragm
of the present invention, FIG. 2 is a cross-sectional view of the same as the case of forming a
cone-shaped acoustic diaphragm, FIG. It is the graph which compared the sound pressure
frequency characteristic of the acoustic diaphragm of this invention, and the conventional
acoustic diaphragm. 1 иии Two-layered film, 2 и и и Acoustic diaphragm, 3 и и и High internal loss film
4 и и и Both elastic modulus film Patent applicant Pioneer Corporation EndPage: ?
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