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Description ° 1 name of the invention
Flame retardant diaphragm
3. Detailed Description of the Invention The present invention relates to a flame-retardant
diaphragm of a speaker. In the past, in order to give flame retardancy to the diaphragm, the
spray method, the impregnation method, etc. were mainly used in f. Or it is made by putting in
this liquid and pulling up, dehydrating and drying, so this liquid gives a large and constant
quality of spring depending on the concentration of the liquid for the time while placing the
diaphragm on the liquid. It was difficult. In addition, since many of the flame retardants are
hygroscopic, the humidity in the air significantly affects the vibration effect, and there is a
deficiency such as adversely affecting the performance as a time-varying tIj speaker. The present
invention has been made to solve the above-mentioned drawbacks, and its object is to provide a
stable yet permanent flame-retardant diaphragm using a completely new material. It is in.
Another object of the present invention is to provide a flame-retardant diaphragm which can be
manufactured inexpensively without providing special equipment. Furthermore, the fiber
EndPage: 1 fiber itself is made to be flame retardant, and it is possible to provide a flame
retardant diaphragm with stable quality, which can be made with a kernel manufactured by an
ordinary paper making method. The figure shows the production process, which is obtained by
reacting raw materials natural cellulose and its derivative or fibers such as L polyvinyl alcohol
with urea and phosphoric acid. Dissolve in oxalic acid incineration solution, leave for a
predetermined time, squeeze and dry it. Then, it is heated to the esterification reaction
temperature (about 140 ° C.), cooled after reaction, and washed with water. And, in order to
form it into a diaphragm, it is dispersed again in water, and it is beaten if necessary, and additives
such as sizing agent 2 coloring agent are added to obtain a diaphragm by a usual manufacturing
method by papermaking, molding and drying. it can. As described above, since the present
invention uses phosphoric acid-based cellulose fiber which is flame-retardant, it is possible to
obtain a flame-retardant diaphragm without changing the formation of the diaphragm at all.
There was a risk that the flame retardancy might be deteriorated due to the temporal change of
the spray type or the impregnation type, but the concern is not required at all. In addition,
phosphoric acid-based cellulose has a high Young's modulus as compared to the raw material
cellulose fiber, and it is possible to obtain a sheet having a high rigidity and a high-vibration
diaphragm. Furthermore, since the phosphoric acid-based cellulose fiber has moisture resistance
as compared with the natural fiber, it is not affected by the humidity in the air so much that
stable performance can always be maintained and the change with time is small.
Moreover, since phosphoric acid-based cellulose is cationic, it is easy to conform to and bind to
inorganic fibers such as metal fibers, carbon fibers, glass fibers, etc., and by combining with these
fibers, a better diaphragm can be obtained.
4 Brief Description of the Drawings The drawings illustrate the manufacturing process of the
present invention. ,-PA \ -1, \ 9 9-Patent applicant! 'Pioneer Co., Ltd. Mogami Electric Co., Ltd.
EndPage: 2
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