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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are sectional views of a conventional
diaphragm and FIG. 3 is a sectional view of the diaphragm of this invention.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a diaphragm for a speaker. The speaker diaphragm should be lightweight to improve acoustic
radiation efficiency, be rigid with a dog to expand the piston vibration frequency range, and be
suitable for internal loss to suppress unnecessary resonance Etc. are required. Conventionally,
paper diaphragms made of natural fibers (pulp fibers) have been widely used as diaphragms for
speakers, or materials of this type can not obtain the required rigidity because they have a
Young's modulus or less. Therefore, in recent years, diaphragms using high elastic fibers such as
carbon fibers have been developed. However, as the high modulus fiber is extremely difficult to
be fibrillated by beating like pulp fiber, it can not be expected at all to combine fibers, so as a
bonding means It is usual to use an adhesive. For example, (1) carbon edge # 1 coated with a
thermosetting resin such as phenol on the surface in advance is dispersed in water to form a
diaphragm, which is then heated to cure the phenol resin. The diaphragm thus obtained has a
structure in which the contact parts of the fibers are bonded by an adhesive as shown in FIG. (2)
After paper making, the carbon fiber layer 21 in the shape of a diaphragm is impregnated with
the phenol resin 22 and then heated to cure the phenol resin. The diaphragm thus obtained has a
structure in which the fibers are bonded by the phenolic resin 22 filled between the fibers 21 as
shown in FIG. 1, the speaker diaphragm in FIG. 1 has small rigidity due to the small bonding
portion between the fibers, and can not prevent the occurrence of variations in the contact state
of the fibers. The quality is not stable. The speaker diaphragm in FIG. 2 has strong adhesion
between fibers and high rigidity, but on the other hand, using a large amount of phenol resin has
a disadvantage that the weight is large and the conversion efficiency is low. Therefore, this device
is intended to obtain a vibrating plate with low rigidity and a small density, and is a diaphragm
for a speaker made of carbon fiber, carbon micro hollow body, thermosetting resin, and the like.
explain. As shown in FIG. 3, the diaphragm of this invention has a structure in which a
thermosetting resin such as phenol resin 21 is filled as an adhesive between the mixed layer of
carbon fiber 21 and micro hollow body 23. The diaphragm of the said structure carries out the
paper manufacturing of the carbon fiber 21, obtains the fiber layer of a diaphragm shape, and
this is phenol resin solution 22 (2 ...% i "!! (10 parts) is infused uniformly in a solution in which
already foamed carbon d micro hollow bodies 28 (1 part two spheres diameter 20 to 160 μ) are
uniformly dispersed, and phenolic resin 22 and charcoal 1 micro hollow bodies between fibers
21 Let 23 fill.
98)] + □ λ and after the solvent in the solution is volatilized, heat is applied to cure the phenolic
resin 22. The characteristics of the diaphragm I obtained by the description L and the
diaphragms I and II of the above-described conventional examples (1) and (2) are as shown in the
following table. , +) Assembly "← 羊 sheep one child king day child ■ Q9 As is clear from this
table, the diaphragm 1 entry of this device) ■ H! The value of i is improved as compared to other
diaphragms ■ and ■, and this makes the vibration of a large rigidity when compared as a
diaphragm of the same weight, and a lightweight vibration when compared as a diaphragm of the
same rigidity. I was able to get a board. Further, since the internal loss is obtained by the energy
consumption by the slide of the micro hollow body, unnecessary resonance can be suppressed,
and the output sound pressure characteristic particularly at the high frequency reproduction
frequency can be made peaceful. As described in [)), this invention is a diaphragm for a speaker
characterized in that a carbon fiber and a carbon micro hollow body are bonded by a
thermosetting resin, which is a heat without weakening the bonding strength. It is possible to
reduce the amount of curable resin and obtain a speaker diaphragm having a large rigidity and a
light weight. , -3'1. :) Abrasive devices are described in the form of carbon fiber 0 ′ 1 ° 1 ゝ 5
、 5 · However, similar effects can be obtained when woven and knitted sheets of carbon fiber
are used.
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