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JPS5871794

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DESCRIPTION JPS5871794
[0001]
The present invention relates to a speaker structure, and more particularly to a speaker structure
such as a speaker with improved heat resistance, an acoustic lens, a horn, and an equalizer.
Acoustic lenses, horns, etc. are required to have characteristics such as small mass, large Young's
modulus, and excessively large internal loss. However, some speaker constructions have heat
resistance in addition to the above characteristics. Required For example, in a car-mounted
speaker or a speaker for a Vautuple 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 sun in a closed state reaches 70-80 ° C. in a closed state, and the structure of a carmounted speaker using a black carbon-based diaphragm has the structure The body may heat up
to 100 ° C or higher, which may cause the acoustic lens or horn 9 to deform and produce
unpleasant noise when the user is sad. Therefore, the present invention is intended to provide a
material superior to any of the conventionally developed materials of construction, a graphite
having a high Young's modulus, an appropriate internal loss, and relatively easy control of
properties. It is characterized in that the component is molded based on a material composed of a
synthetic resin. Graphite (graphite), particularly flaky graphite crystals, exhibit extremely high
Young's modulus, but they are fragile, poor in formability, and relatively large ones can not be
formed only with pure graphite crystals. Therefore, by using a fine scaly graphite crystal (1 to 5
μ) as a binder, a molded article having a good Young's modulus is obtained. Therefore, a
material in which graphite is impregnated with 7-enol resin and polyvinyl chloride has been
provided, but when this is used as a diaphragm, the internal loss tan α is small, about 0.02, and
it can not be said that 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,
the Young's modulus at room temperature or higher temperature environment As a result, it can
not be put to practical use as a structure of a car-mounted speaker under high temperature
02-05-2019
1
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. The scaly graphite and the speaker structure formed by
impregnating the scaly graphite with the synthetic resin are formed by selecting polyvinyl
chloride, an ABS resin, or the like as a synthetic resin to be impregnated into the graphite.
The speaker structure according to the present invention uses polyvinyl chloride as a binder for
the scaly graphite, and post-chlorinated polyvinyl chloride to further improve heat resistance,
and an ABS resin which contributes to improvement of heat resistance and processability. The
heat distortion temperature of the component is raised. Example 1 (parts by weight) polyvinyl
chloride 60 ABS resin 40 lead stearate 2 flake graphite 200 (lead stearate is used as a heat
stabilizer for polyvinyl chloride and a lubricant at the time of kneading. 2.) This is kneaded by a
mixed wire roll, an internal mixer, an extruder or the like, and further rolled using a roll. This
rolling is repeated several times so that the flat surface 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 per King. Density 1.7 x 103 kg / s3 Young's modulus 5.7 x 10 phantom N / m2 internal
loss tan α 0, 02 This sheet-like material is formed into a desired shape by hollow molding
method, pressure forming method, extrusion molding method etc. Get the body. Conventional
example (Compounding example 2 parts by weight) Polyvinyl chloride 100 lead stearate 2 scalelike graphite 200 Example 2 combination example (weight part) polyvinyl chloride 30 postchlorinated polyvinyl chloride 30 ABS resin 40 lead stearate 2 scale-like graphite A sheet
obtained by the same process as in Example 1 has a heat distortion temperature of 1,7 × 1 G1
kg / m * Young's modulus 5,5 × 10 ′ ′ N / 12 internal 11I arrow tana 0102 compared with
the conventional structure. It is improved by 30 ° C. to about 100 ° C. Incidentally, if the
blending amount of post-chlorinated polyvinyl chloride is smaller than that of the abovementioned blending-, the heat deformation degree II is lowered by a low □, but the workability is
improved. Conversely, if the amount is increased, the heat distortion temperature rises, but the
workability decreases. Therefore, the amount of post-chlorinated polyvinyl chloride is
appropriately clarified depending on the use of the speaker structure. Example 3 Formulation
example (parts by weight) Post-chlorinated polyvinyl chloride 60 ABS resin 40 lead stearate 2
scaly graphite 200 The sheet obtained by the same process as in Example 1 with these
formulations has a density of 1.7 × 10 ′ ′ ko / l "Young's modulus 5.3 X 10" N / ai 2 internal
loss tana O, 02 Temperature characteristic of Young's modulus According to the IiI chart, it is
about 50 ° C improved to 120 ° C compared to the conventional product .
As apparent from the above description, the loudspeaker assembly of the present invention is
suitable for use in high temperature environments, in particular, with less deterioration in quality
and characteristics, in particular Young's modulus, due to aim.
02-05-2019
2
[0002]
Brief description of the drawings
[0003]
The attached drawings show the relationship between Young's modulus and concentration of an
adult of the present invention and a conventional article construction.
Patent application applicant Pioneer Corporation Representative Attorney Kobayashi Nobuaki
02-05-2019
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