JPS5657393

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DESCRIPTION JPS5657393
Specification 1. The diaphragm for an audio device (1) A diaphragm for an audio device,
characterized in that triacetyl cellulose is heated and pressed.
2, the scope of claims
3. Detailed Description of the Invention The present invention relates to a diaphragm for acoustic
equipment, and more particularly to a diaphragm molded of triacetyl cellulose. Many of the
diaphragms for audio equipment represented by a moving plate of a speaker are made of pulp,
and recently, those molded of polyester film material are used for noise. Each of these diaphragm
materials has advantages and disadvantages, and it is necessary to use properly in accordance
with the purpose of use. For example, it is the most widely used of 5 because it is used as the
vibration treatment fi in the pulp exhibition, with a relatively large file rate and an appropriately
large internal loss, so it is suitable for dampness and excessive human power. It may ignite and
has a drawback of poor heat resistance. Although some moving plates using polyester film are
also included, it is necessary to reduce the stiffness because the drawbacks of such pulp
diaphragms are not solved and the yaw rate is small. If a thin film has to be used 6 (a thin film
diaphragm is used, there is a disadvantage that split vibration occurs. Since these diaphragm
materials, in particular, pulp materials are left as they are physical properties of the material
even after the diaphragm is molded, they should be reformed to compensate for the
characteristics of the diaphragm. In other words, it is difficult to control the characteristics.
Therefore, this invention uses a sheet or film of triacetyl cellulose (three vinegar 2 cellulose) as a
material of a controllable diaphragm for acoustic equipment, and attempts to obtain a diaphragm
suitable for the application by using EndPage: 1 It is. Hereinafter, the diaphragm for audio
equipment according to the present invention will be described. First, in order to form a film of
triacetyl cellulose of an appropriate area into a diaphragm of a desired shape, for example, a
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dome-shaped diaphragm, a diaphragm plate / ft of triacetyl cellulose is obtained, and this
diaphragm plate l is Pressure and heat are applied to obtain the dome-shaped diaphragm 3.
Furthermore, after this dome-shaped vibration & 3 (hereinafter, simply referred to as a vibrating
plate) mold release, cooling is performed by a forced cooling device. In addition, although it may
be cooled together with the molding IJ- to release the mold, the cooling cost is increased. The
hardness of the diaphragm 3 according to the present invention vibrates depending on the time
from the processing temperature to the normal temperature, and the hardness decreases as the
time required for the temperature drop becomes shorter. In other words, the Young's modulus is
increased, and the internal loss can be suppressed appropriately. The cooling time and the
cooling temperature are determined according to the conditions such as the molding
temperature and thickness of the diaphragm 3. Furthermore, in the case of achieving the
vibration characteristic tf of the diaphragm 3, it is possible to form a thin film of gold, such as
aluminum and zinc, by using a metal deposition method.
As is apparent from the above description, the diaphragm for audio equipment of the present
invention is formed by Doria e chill cell, so its mass (weight 1) is reduced and Young's modulus is
large. In particular, depending on the conditions of the forming process In this case, the Young's
modulus can be appropriately controlled, and at the same time, the internal S loss can be
selected. Furthermore, since it is flame-retardant, hygroscopicity is small and elongation due to
temperature and humidity is also small, a diaphragm excellent as a diaphragm is obtained. Be
Example of losing shape Step 3 of obtaining a diaphragm using a vinegar cellulose film, the film
is cut to a predetermined size and preheated in a heating furnace at about 100 to 110 ° C. to
cure the film. 2. A mold formed in the shape of a diaphragm, an upper mold of about 150 u, a
lower mold of about 130 ° C., pressurization 6 for 9 / −time 20 seconds, pressure and heat
forming are performed to obtain a desired diaphragm. Also, the upper mold 150 ° C., the large
size 130 ° C., pressing and heat forming, and cooling to a temperature of the mold 50 ° C. and
cooling to a plate temperature of 50 ° C. The resultant is further subjected to molding
processing on the inner and outer diameter portions of the diaphragm to obtain a desired
diaphragm. The characteristics of the obtained diaphragm are as follows: when the sample 1 @ 1
triacetic acid film is heated and pressurized and the mold is cooled to about 50 ° C., the m 2
triacetate film is heated and not cooled after pressurized 3 Polystyrene resin film (conventional
example) 5-
4. Brief Description of the Drawings FIG. 1 is an explanatory view showing a forming process,
and FIG. 2 is a cross-sectional view of a diaphragm on which a thin gold part layer is formed. l ···
vibration softwood, co ... mold, 3 ··· fi rotation plate 3a ··· metal thin layer patent applicant Pioneer
Corporation same top Den'iso stock Board juice s - 'attorney Attorney Small Tachibana i 6
floating amount patent attorney Susumu Murai 6-EndPage: 2
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