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JPS5379524

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DESCRIPTION JPS5379524
Specification 1 Name of the Invention Method of manufacturing a speaker diaphragm A thin
plate obtained by compacting chopped carbon fibers with a thermosetting resin such as phenol
resin or phenol epoxy resin is used in a pair of male and female flat plate shapers or this thin
plate A method of manufacturing a speaker diaphragm, wherein the shape is formed by heating
and pressing in a pair of female and male formed certificates having a desired shape such as a
cone shape and a dome shape.
2, the scope of claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of
manufacturing a speaker diaphragm for use in audio equipment and the like. A conventional
speaker diaphragm to which a synthetic resin, metal or carbon fiber is added is mainly composed
of bp-removed pulp as a base material (matrix), to which short-cut chopped fibers t-5 to 30 Wd
cut short are added to this. When making a sheet or adding a larger amount of fibers than the
above-mentioned value, the degreased pulp has no adhesive effect to bind the fibers, so by
adding a rubber such as NBR + SBH, etc. It was. However, in these methods, the bond strength at
the interface between the fiber and the rubber or the pulp is weak, and a slack occurs between
the fiber and the base material. Although this phenomenon appears to increase the internal loss
of the diaphragm and contribute to the exertion of the damping effect, the looseness between the
substrate and the fiber is not a tunable factor. That is, since it is not a process control factor, the
internal loss can not actually be controlled, and an asymmetric vibration (hanging mirror partial
vibration) that causes the generation of distortion that is the most drowning in the speaker
characteristics occurs. In addition, sandwich the thin plate in the molding bed of one female and
one male and heat it. The compression molding method is commonly used for plastic films and
thin metal sheets, but it is a high elastic body containing a large amount of fiber reinforcement
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such as a diaphragm and having a large projected area / plate thickness ratio, I have not found a
precedent. The object of the present invention solves the drawbacks of the prior art as mentioned
above and can take a large internal loss? It is an object of the present invention to provide a
method of manufacturing a speaker diaphragm in which the occurrence of asymmetric vibration
is suppressed. EndPage: In the present invention, the bonding strength at the interface between
the substrate and the fiber, which is a drawback of the prior art, is maintained at the strength of
the substrate free by the adhesive effect of the substrate. Further, the internal loss of the
diaphragm is controlled by the dynamic viscoelasticity of the base material. Therefore, as in the
prior art, it is not due to an uncontrollable phenomenon such as the looseness at the interface
between the substrate and the fiber, but the adhesion of the substrate, adjustment of the dynamic
viscoelasticity, ie, within the range of substrate selection Control contributes to quality
improvement. In addition, a method which has already been adopted for forming a plastic film or
a thin metal plate is appropriately combined and heated and pressure-formed to obtain a
diaphragm having a desired shape. In order to increase the bonding strength at the interface
between the substrate and the fiber, that is, the bonding strength, the surface of the fiber may be
sufficiently soaked with a highly adhesive substrate. Also corn-like. In order to form a desired
shape such as dome shape, by selecting a material that has high fluidity, in other words, good
flow under heat and pressure in the mold, the formability can be maintained at the same time.
Adhesiveness can also be secured. When the thickness is extremely thin, the projected area is
large, the thickness uniformity of the molded product is high, and the base material contains a
large amount of non-soluble matter such as fibers in the substrate, such as a diaphragm. Good
lubricity of the mold surface and the interface with the fiber, and furthermore, the adhesion
between the substrate and the fiber after curing. It is important to select one having good
releasability from the mold. For solving the above problems, resol-type phenolic resin generally
used for laminates is suitable. An outline of the material and production method according to the
present invention is shown in FIG. This manufacturing method is a combination of manufacturing
methods of plastic molding materials or plastic films. However, a large amount of carbon fiber,
and manufacture of a prepreg thin plate of phenol resin or phenol 0 epoxy resin as a base
material, and heating and pressing a thin plate between a male and female pair of molding dies to
form a diaphragm of a predetermined shape They are combined in consideration of
manufacturing conditions so as to be molded. Density 9 modulus considered important as
diaphragm material. The hardness etc. is cut short 1 as shown in FIG. Add a large amount of
surface-treated carbon fiber in non-orientation and push it. Harden it into a thin plate. Here, a
phenol resin or a phenol-epoxy resin is used as the base material, but this is properly adapted to
the required characteristics of the design so as to sufficiently secure the binding effect of the
carbon fiber. Determine the relative mixing ratio with the material and carbon fiber material. For
mixing of the base material and the carbon fiber, Unider, a Henschel mixer, an extruder kneader
roll, etc. may be used, and an appropriate one may be selected from these. The thickness and
shape of the thin plate are determined by the required performance of the speaker. In the case of
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a flat speaker, the base material and the carbon fiber are kneaded, and heat and pressure are
applied and hardened under predetermined conditions with a thin plate all flat plate mold made
to a predetermined thickness. In the case of the dome shape or the cone shape, a thin plate made
to a predetermined thickness after mixed wire is molded by heating and pressing with a mold
having a predetermined shape of 9 dimensions. Three countries Next, Examples 1 to 8 according
to the present invention are shown in the order of →. The shapes of the flat plate, the dome and
the cone are shown below Table 1. An example of the sound pressure and frequency
characteristics of the speaker according to the present invention is shown in FIG. As described
above, according to the present invention, in a process constructed by combining conventional
techniques in plastic and metal thin plate processing as appropriate, the elastic modulus is high
and the internal loss is large by one plate by a simple method. A diaphragm with an effect can be
manufactured, and the performance improvement and cost reduction effect are large.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 outlines the manufacturing process and process
conditions of the present invention. FIG. 2 shows an example of the sound pressure 0-frequency
characteristic of the diaphragm according to the present invention. Table 1 shows the contents of
the embodiment 1 to station 18 shown in the table. Attorney attorneys 1) Toshiyuki EndPage: 2 o
2 Figure f @ 成 畝 (KH オ) 乎 3 wrapped board dod-4 cone □ 補正 Amendment 4 4 pa "3,3Q
year. Patenter's name display of the Patent Office Patent application Patent No. 154876 of the
invention The name of the invention of the speaker diaphragm correction method The residence
Tokyo Chiyo ['+1 ward 0 in the circle 0 in-0-5 in the Hitachi, Ltd. City story east f + (27 u 2 + 1
eyes), C (table)--name (72 g? ) Patent attorney thin 1) Brief description section of the drawing of
the target specification of interest and profit correction and the contents of drawing correction.
The section of the brief description of the drawing on page 6 of the specification is corrected as
follows. Patenter's name display of the Patent Office Patent application Patent No. 154876 of the
invention The name of the invention of the speaker diaphragm correction method The residence
Tokyo Chiyo ['+1 ward 0 in the circle 0 in-0-5 in the Hitachi, Ltd. City story east f + (27 u 2 + 1
eyes), C (table)--name (72 g? ) Patent attorney thin 1) Brief description section of the drawing of
the target specification of interest and profit correction and the contents of drawing correction.
The section of the brief description of the drawing on page 6 of the specification is corrected as
follows. [FIG. 1 shows outline W of the manufacturing process and process conditions of the
present invention? FIG. 2 shows the sound pressure of the diaphragm according to the present
invention-frequency #! ! One example of the characteristics is shown in FIG. 3 (α), (b), (c) and (d),
which are examples of characteristics of the present invention. Tube showing cause, Ch), (c). It is
a figure which shows the shape of the Example shown (4 ((alpha)) K). 2 Figure 1 Figure 3 is
corrected to the attached drawing. 573 (α) (A) (C) (d) === = 4 = 1 EndPage: 4
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