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April 2, 1972. Patent Office Secretary Itomu Hisashi 1, title of invention 3, inventor's address and
name (582) Matsushita Electric Industrial Co., Ltd. 5, representative's address and name of Osaka
Osaka Nishi-ku Edohori Kita 2 No. 25 (Totomi Building) Published patent publication ■ No
request for examination of Japanese Patent Application No. 412097 (all two pages)?
Specification 1, Title of the Invention 1, Title of the Invention Method of Producing Electret
Electret manufacturing method 2 °
3. Detailed Description of the Invention The present invention relates to a method for producing
a permanently charged dielectric material, that is, an electret, and the object of the invention is to
obtain a relatively stable electret quickly without requiring complicated steps. It is a thing.
Conventionally, as a manufacturing method of electret, a dielectric material to be electretized is
placed in an electric field, which is heated to a temperature near the melting point of the
dielectric material and cooled under a state where the electric field is applied again. However, the
process was complicated and it took a long time to manufacture, and depending on the method,
only an unstable product with a small amount of charge could be obtained. The present invention
solves the disadvantages of the conventional method as described above, and the method will be
described below with reference to the drawings. (1) is an original plate made of a dielectric
material already electretized, and (2) is a polymer film to be electretized. Both the original plate
(1) and the polymer film (2) can be made of a material having high specific resistance and good
insulating properties, such as tetrafluoroethylene, polypropylene, tetrafluoroethylenehexafluoropropylene copolymer, etc. . A solution containing the polymer film (2) mounted on the
above original plate (1) and containing the amount of charge of the upper surface of the original
plate K and the charge amount of the K original plate (1) isocratically 7, 7 or more volatile polar
solvents Apply (3) and dry. The drying temperature and time may be different depending on the
kind of solvent used, such as decoal J acetone etc., as long as the coating solution (3) can be
evaporated, and the temperature does not need to be high. EndPage: 1 may be naturally dried
under normal temperature. After drying, it is confirmed that there is no electrostatic field on the
upper surface of the polymer film (2), and the polymer film (2) is separated from the original
plate (1). When the polymer film (2) is placed on the positively charged surface of the original
plate portion in the step of electretizing in this manner, the surface in contact with the original
plate (1) of the polymer film (2) is positive It becomes an electric charge, and the surface to
which the polar solvent is applied is expressed as a negative electric charge. Next, an example
will be described. A 22 μm thick polypropylene charged approximately 1 cf'o / cell is used as a
base plate, and a polymer film consisting of 50 to 0.44 ts ethylene is placed on the positive
charge side of this base plate, and its upper surface is equal to the base plate
Wipe with cotton
impregnated with alcohol that has an electric charge, and dry naturally. Make sure that there is
no electrostatic field on the dry * vk top surface, and remove the polymer film from the original
plate. When the depolarizing sheet electretized by the method as described above is drawn
between the electrodes, and the two electrodes are connected with a current needle and
uniformly heated to measure the depolarization current, the crystalline dispersion point of the
polymer is obtained. As described above, according to the present invention, the dielectric
material can be rapidly electretized without requiring complicated steps, and a relatively stable
product can be obtained, etc. The effect of is a large book.
4. Brief description of the drawings. FIG. 1 is an explanatory view showing a state before
application of a polar solvent on the upper surface of a polymer film in the manufacturing
process of electret according to the present invention, FIG. These are explanatory drawings which
show the time of polymeric film detachment ¦ leave. (1) ... Original plate (2), -O polymer film (3),
··· O liquid agent patent attorney Oshima-1 outside person 7 agent other than the above Osaka
City Nishi Ward Edohori Kitadori 2 J- Eye number 25 (Totoru pill) EndPage: 2
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