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Patent Office Secretary 1 + 3, inventor ノ table applicant オ オ サ カ シ マ ク ナ 市 市 区 丁 丁 丁
4-chome No. 6-15 (Specification 通 1 = 1 = 1 千 1 薔 1 通, 1 patent = \, ■ Japan Patent Office
published patent division axis 8 ■ Japanese Patent Application Laid-Open No. 61 to 6, published
0 Japanese patent 51. (1976) e, 16 / Gu, / ', f, 1 Description 1 of the invention name
Loudspeaker diaphragm
3. Detailed Description of the Invention The present invention relates to a diaphragm for a
monophone which has excellent characteristics when applied to a heat resistant or flame
retardant loudspeaker. The requirements for the fibrous diaphragm of the cone type loudspeaker
are: low electro-acoustic conversion efficiency, small mass, high elasticity (Young's modulus) to
eliminate distortion of reproduced sound, and In addition to having a bulky, low density, and loss
factor of noodle skin, heat resistance, flame resistance, etc. are recently required to be
particularly suitable for disaster prevention or use in special environments. became. In order to
meet these requirements, there is a diaphragm in which a varnish is applied to the upper surface
of a paper fiber molded product, or glass fiber or carbon fiber is mixed with paper fiber.
However, the diaphragm coated with varnish does not have sufficient heat resistance, flame
resistance and chemical resistance due to its nature, and the weight of the varnish additionally
increases the mass of the entire diaphragm, resulting in electroacoustic conversion. The
efficiency may be deteriorated, and due to the apparent hardness of the dried varnish and the
surface, when it is cured and incorporated in the loudspeaker 5, the shape may change or the
standing wave or the fresh water may be generated. 'There was a variety of drawbacks that
would cause distortion during playback. In addition, the diaphragm of the glass fiber mixed paper
has a large weight, so the electro-acoustic conversion efficiency of the loudspeaker is lowered,
and the shape of the glass fiber is linear and the surface is smooth, and the affinity with water. In
the paper-making process, the intertwining state with paper fibers is weak and unfamiliar, so it is
easily peeled off by vibration. Therefore, the rigidity of the diaphragm can not be increased, and
the property changes with the passage of time of use, and the rigidity is rapidly deteriorated. In
addition, when the glass fiber melts and hardens against flames, the properties of the diaphragm
and the frequency response become extremely poor. The present invention, which is aggravated
by the above, is a diaphragm for loudspeakers which has the excellent characteristics without the
drawbacks of the conventional products such as-. That is, the diaphragm of the present invention
is a diaphragm formed by mixing a paper having a phenol / formaldehyde resin as a substrate
(trade name KAYNOL) with a paper fiber. Phenol / formaldehyde resin fiber has a specific gravity
of 127 or half of that of carbon fiber, elastic Young's modulus is 450 μA, and it has not only the
physical properties optimum for pyramidal diaphragm, but also has its own 2500 ° C Since it is
a fiber that can withstand high temperatures, a fibrous diaphragm formed by mixing paper /
formaldehyde resin fibers with paper fibers can withstand high temperatures of 400 ° C. or
Therefore, it is possible to form an optimal diaphragm for a loudspeaker requiring heat
resistance and flame retardancy. In addition, since phenol-formaldehyde resin fiber has a socalled shrunken shape (condensing property) and the fiber itself has a moisture content as high
as 6%, it is very hydrophilic or strong, so it is There is absolutely no risk that the reproduced
sound quality will change over time during use, as it is entangled with paper fibers, strong or
familiar, and does not deviate after molding of conventional mixed paper products after molding.
. Also, as described above, the amount of fibers is as small as 127, and it is a property that easily
contains fibers or air so that a bulky and low density diaphragm can be formed. This is also the
most suitable property as a diaphragm for loudspeakers. And the phenol-formaldehyde resin
fiber has a Young's modulus of 7 /-at 450, or this value relatively increases the rigidity by 1 in a
diaphragm with a large mixing ratio, in a wide range of mixing ratios The diaphragm is provided
with an appropriate loss factor so that sharp peaks and valleys are not generated in the sound
pressure frequency characteristics, and particularly in the low band range loudspeaker, the peak
valleys are produced in the frequency band near the conventional crossover frequency range. I
can not live at all. Also, even if the diaphragm surface is exposed to flames, the fibers will not be
damaged even if they may be painted, and the physical properties remain unchanged, so the
diaphragm made of mixed paper has heat resistance and flame resistance. There is no change in
shape due to aging. As described above, a diaphragm for a loudspeaker, which is formed by
mixing a paper based on a phenol / aldehyde resin with paper fibers, is a diaphragm having
excellent properties as a heat-resistant, flame-retardant diaphragm. EndPage: 2
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