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And 2 = o4 patent application (B) 記号 January 19, 1974 Secretary General of Patent Office 2,
inventor & patent applicant address Meguro-ku, Tokyo w wadai 8-chome 6-17 4, attached
documents Catalog [Phase] Japan Patent Office 0 JP-A 50-1046350 published Japan 50. (], 975)
8.18 ■ Japanese Patent Application No. f-? 732 No. 611-65551, the name of the invention
How to handle corn paper
3. Detailed Description of the Invention The present invention relates to a method of processing
cone paper in a cone speaker. The cone in the cone speaker is extremely important in sound
quality and characteristics, and the material mainly composed of paper is considered to be the
most suitable one that almost satisfies various conditions required as the material of the cone.
The pulp, and as a paper paper system, also as a main material, mixing as a main raw material,
which is quite contradictory in density, internal loss, longitudinal wave propagation velocity,
Young's modulus, etc. Traditionally, excellent corn paper has been produced. In addition, it can
not always be strong enough to use paper as the main constituent, and moreover, it causes a
large change in characteristics with changes in humidity, so for the purpose of imparting
strength or preventing moisture, or Young's modulus For the purpose of increasing the size,
many methods are adopted in which corn paper is impregnated with lacquer or the like to which
a moisture-proof paint, a damping agent, or the like is applied and treated. Conventionally, when
processing corn paper, there are the following two methods. The-is mixed with water, at one time
with valve refining or before papermaking, and mixed with hemp, wool, glass fiber, rosin, NBRl
and its fine ice-soluble resin, etc. The second method is a method in which a biscloid damping
agent, an acrylic resin, a butyl rubber, a urethane resin EndPage: 1 or the like is applied after
paper making. Many of the above-described conventional processing methods exhibit sufficient
effects to change the sound quality and characteristics, and some of them increase the strength
of corn paper, but few satisfy both simultaneously. This is because the first treatment method
described above requires that the material be water-soluble so that the material is restricted. Still,
in the second treatment method, it is only adhered to the surface of corn paper It is difficult to
penetrate to the inside. The present invention has been made to solve these problems, and it is an
equivalent mixture of styrene butadiene rubber (SBR) and modified phenol which is excellent in
properties as an impregnating material to corn paper, using toluene as a solvent It is a processing
method of immersing and making the paper sheet made into a paper sheet melt, to make it
permeate sufficiently, and to dry-record this. In the example, a mixture of 50 parts of 5DR and 50
parts of denatured phenol is melted with toluene, and the corn paper prepared according to the
specified specifications is immersed in it, and the first + r4 is a characteristic diagram of the corn
paper not treated. FIG. 2 is a characteristic diagram of a diaphragm in a 13 cm squawker treated
by the method of the present invention.
As apparent from the comparison of the% notes in FIG. 1 and FIG. 2, it can be seen that there is a
great improvement in the flattening of the frequency characteristics and the reduction of the
distortion characteristics. Therefore, according to the processing method of the present
invention, the strength of corn paper can be increased without increasing mass as compared with
other methods, and improvement of frequency characteristics (output sound pressure
characteristics, distortion characteristics, etc.) Is significant compared to other methods.
Furthermore, since this method is a method of impregnating the whole with a coating method
different from the coating method, there are excellent advantages such as no unevenness or
variation in adhesion, easy processing technology and uniform product.
4. Brief Description of the Drawings FIG. 1 is a characteristic diagram of corn paper not treated at
all, and FIG. 2 is a characteristic diagram of corn paper treated by the method of the present
invention. 葆 11 blade Fig. 5, Inventors other than the above EndPage: 2