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The present invention relates to a speaker diaphragm, and more particularly to a speaker
diaphragm having improved heat resistance. Loudspeaker diaphragms are required to have small
mass, high Young's modulus, and appropriately high internal loss. However, certain loudspeakers
require heat resistance in addition to the above characteristics. . For example, in a car-mounted
speaker or a speaker for a portable radio cassette, the temperature may be considerably high due
to direct sunlight or sealing in the car. For example, in summer, a car parked for a long time
under the hot sun reaches 70-80 ° C. in a closed state, and a car-mounted speaker using a black
carbon-based diaphragm is: The diaphragm may reach 100 ° C. or higher, and in the case of a
sore, the diaphragm may be deformed to cause an unpleasant sound. Therefore, the present
invention is intended to provide a superior one to any diaphragm material developed in the prior
art, and it has a high Young's modulus, an appropriate internal loss can be obtained, and control
of characteristics is relatively easy. It is characterized in that a diaphragm is formed based on a
material composed of graphite and a synthetic resin. Graphite (graphite), in particular scaly
graphite crystals exhibit extremely good Young's modulus, or large ones like diaphragms can not
be formed with pure graphite crystals alone. By using a resin as a binder, crystals (1-5 μm) are
made into a molded article of ^ Young's modulus. Therefore, a material in which graphite is
impregnated with a phenol resin and polyvinyl chloride has been provided, but when this is used
as a diaphragm, the internal loss tan α is as small as about 0.02, and the performance is
insufficient. In addition, although polyvinyl chloride and polyvinylidene chloride impregnated
into graphite have a large internal loss tan α of 0.05, they show a Young's modulus at a
temperature environment of room temperature or higher. A remarkable drop is recognized, and it
can not serve as a car-mounted speaker placed in a high temperature environment. In the present
invention, while making full use of the characteristics of graphite, the internal loss is improved,
and furthermore, the Young's modulus does not decrease and the physical properties do not
change extremely under high temperature environment by sunlight as well as under normal
temperature. A scale-like graphite and a diaphragm for a speaker formed by impregnating the
same with a synthetic resin, polyvinyl chloride and ABS resin as a synthetic resin to be
impregnated with the graphite. -3- and so on were selected. The diaphragm for a speaker
according to the present invention uses polyvinyl chloride as a scaly graphite scaly material and
post-chlorinated polyvinyl chloride to further improve heat resistance and ABS which contributes
to improvement of heat resistance and processability. The resin is blended to adjust the heat
distortion temperature of the Z diaphragm.
Example 1 Formulation example (parts by weight) polyvinyl chloride 60 ABS resin 40 lead
stearate 2 flake graphite 200 (lead stearate is polychlorinated! Nil's heat stabilizer is used as a
lubricant at the time of kneading. The mixture is kneaded by means of a kneading roll, an
internal mixer, an extruder or the like, and is further rolled using a roll. This rolling is repeated
several times so that the flat face of the flake graphite flakes is oriented parallel to the surface of
the rolled sheet. The physical properties of the obtained sheet at 30 ° C. are as described above.
Density 1.7 × 10 3 kg / l Young's modulus 5.7 × 10 ′ ′ N / 12 internal loss tan α 0, 02 This
sheet-like material is formed into a desired shape by vacuum forming, pressure forming or the
like to obtain a diaphragm. The attached drawings show the relationship between the diaphragm
according to the present invention and the Young's modulus and temperature of a conventional
product diaphragm which will be shown below as a combination example. Conventional Example
(Composition Example Double Part) Polyvinyl Chloride 100 Lead Stearate 2 Scale-Like Graphite
200 Example 2 Formulation Example (Weight Part) Polyvinyl Chloride 30 Post Chlorinated
Polyvinyl Chloride 30 ABS Resin 40 Lead Stearate 25 Scale Sheet obtained by the same process
as in Example 1 had a density 1.7 × 103 kg / 1 Young's modulus 5.5 × 10 Vaginal N / 12
internal loss tan α 0.02 heat deformation as compared with the conventional diaphragm. The
humidity is improved by C. to about In addition, if the compounding
quantity of post-chlorinated polyvinyl chloride is reduced from the said compounding quantity,
heat distortion temperature will fall, but workability ¦ operativity will improve. Conversely, if the
amount is increased, the heat distortion temperature rises, but the workability decreases.
Therefore, the blending amount of post-chlorinated polyvinyl chloride is appropriately adjusted
depending on the use of the speaker. Example 3 Formulation example (weight 11 postchlorinated polyvinyl chloride 60 ABS resin 40 lead stearate 2 scaly graphite 200 sheet obtained
by the same process as in Example 1 according to these formulations, density 1.7 × 103 kg / L
Young's modulus 5, 3 X 10 唖 N / 112 internal loss tan α 0.02 Young's modulus According to
the moisture characteristic curve, it is about 50 ° C improved to 120 ° C compared to the
conventional product . As apparent from the above description, the speaker diaphragm of the
present invention has a small decrease in Young's modulus due to temperature, and is
particularly suitable for use in a high temperature environment.
Brief description of the drawings
The attached drawings show the relationship between Young's modulus and temperature of the
diaphragm of the present invention and the diaphragm of the conventional product.
Patent application applicant Pioneer Corporation Representative attorney Patent attorney Shingo
Kohashi Patent attorney patent attorney Susumu Murai 7-Chief of Patent Office Kazuo Wakasugi
1. Patent No. 121180 No. 2, name of the invention, speaker diaphragm 3, relationship with the
case making correction Patent applicant Tokyo Meguro-ku, Tokyo R-4, No. 4, No. 4, Agent 5,
Scope of claims in the specification of the correction, column 6 of the claims of the specification,
as per the attached sheet of the correction (Attachment) 2, claims (1) Vibration for a speaker
formed by mixing scale-like graphite and this with a synthetic resin The diaphragm for the
speaker comprised with polyvinyl chloride and / or post-chlorinated polyvinyl chloride 90-20,
ABS resin 10-80, scale-like graphite 30-300 each part weight in a board ¦ plate.