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■ Manufacturing method of diaphragm for loudspeakers App. Akira 47-8828 ■ Japanese
Patent Application No. 43-72651 [Phase] Application No. 43 (1968) October 4 @ inventor
Koizumi Tomon True Oji Kamon Shin 1006 Matsushita Electric Industrial Co., Ltd. 0 Applicant
Matsushita Electric Industrial Co., Ltd. Kadoma City Oji Kadoma 1006 [Phase] Agent patent
attorney Toshio Nakao 1 person
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are process drawings showing an
embodiment of the method for manufacturing a speaker diaphragm according to the present
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of
manufacturing a speaker diaphragm for improving the sound quality of a speaker. In general, as
a method of improving the speaker sound quality, a filler is fixed to or impregnated in a
diaphragm. When the filler is applied in this manner, the sound quality is improved.
Conventionally, melanin, styrene, acrylic, polyester, polyamide as this filler. A method of fixing
the above-mentioned emulsion on a vibrating plate element in one step using an emulsion such
as vinyl or the like, and manufacturing the vibrating plate by impregnating the dried emulsion of
the vibrating plate element . Depending on the type of filler or the method of fixing and
impregnating the above-mentioned filler or depending on the type of filler, the fixability may be
poor, or the operation as a diaphragm may require a lot of labor and the productivity may be
poor. It had a drawback. Moreover, after mixing polyvinyl alcohol powder with the water which
dipped the stock fiber conventionally, it is made clear and the method to heat-mold is also
clarified, but [111111] vinyl alcohol is a thing by this method. In order to prevent rapid gelation
of the powder, the pH in the beating machine must be maintained at about 10, a strong alkali
substance such as ammonia is added, and then a resin such as latex is gradually added, and then
acidity Although aluminum sulfate, which is a substance, is added, a strong odor is generated and
considerable investment is required in terms of equipment, and pH adjustment greatly affects the
fixability of the resin agent, and if the pH is too high, acidic substances Does not settle on fibers,
and when the pH is low, when an acidic substance is loaded, gelation occurs, and it hardly settles
on fibers, and large resin clumps are possible. Ri, fixability Anyway poor, only 30-40% of the
amount of resin even when the correct pH turned to settle, was larger extremely irrational
material loss. The present invention eliminates the above-mentioned conventional drawbacks.
Hereinafter, the manufacturing method of the present invention will be described with reference
to the drawings of one embodiment. First, FIG. 1 shows a free-edge type diaphragm, and FIG. 2
shows that an edge is simultaneously formed from the time of paper making. As shown in FIG. 1
and FIG. 2 together with A, mainly made of Western paper and Japanese paper 5 synthetic fibers,
the fibers are formed to form the diaphragm element 1. As shown in B with this diaphragm
element 1 in a semi-dry state (50 to 80% of moisture), the above-mentioned vibration is applied
to the filler 2 such as rubber latex, synthetic rubber, latex (nitrile, acrylonitrile, nitrile, butadiene)
The plate body 1 is sprayed by the sprayer 3.
The sprayed filler 2 is sucked into the diaphragm substrate 1 and impregnated therein. After the
filler 2 is sprayed, a fixing agent 4 of an acidic substance such as alum is sprayed by a sprayer 5
as shown by C to fix the rubber component on the fibers of the diaphragm 1. As shown in
[111111] EndPage: 1 and D, molding is performed using a heat drying and heating and pressing
mold 6 or the like. And, it is shown in FIG. In the case, a separately formed edge is adhered to
form a central hole. The one in FIG. 2 only needs to form a central hole. Further, in the case of
FIG. 2, it is better not to spray the filler 2 and the fixing agent 4 of the rubber latex described
above up to the edge portion. Which is to reduce the elasticity of the edge portion. Furthermore,
the filler 2 and the fixing agent 4 may be applied not only by the spraying method but also by the
coating method. As described above, according to the method of the present invention for
producing a diaphragm for a speaker of the present invention, a fiber is formed mainly of paper
and Japanese paper 5 synthetic fibers to form a diaphragm element, which is semidried and
coated with rubber latex. Or, after spraying, and after fixing and fixing with a fixing agent, heat
compression molding or heat drying is carried out, the rubber component equivalent to the
coated amount remains bound to the fiber, so the properties of the rubber and the fiber are
combined. Thus, it is possible to obtain a diaphragm having a high rate and a large internal loss,
and the material can be utilized to the maximum extent, which is economically extremely
advantageous. In addition, since rubber is fixed, size effect occurs, and the characteristics with
little distortion, the change in the shape or characteristics of vibration like rl 111 111 due to
temperature and humidity are extremely small, and can be easily and quickly manufactured,
resulting in excellent productivity. It can be Furthermore, it is necessary to consider the pH as
compared to the case of adding it to the inside of a beating machine in order to form a rubberbased latex in a semi-dry state and apply or spray to adhere it and then fix it with a fixing agent.
The fixing amount can also be made close to 100% compared to the one of 30 to 40%, which is
extremely effective, there is no need to add an extra device as a refining machine, and it is simple
as a manufacturing facility It can be very rational and can be a dog of industrial value.
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