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JPS4930745

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DESCRIPTION JPS4930745
■ Int-C1-0 Japan Class [phase] Japan (H04r7100102K3 Patent ■ Speaker diaphragm and its
manufacturing method ■ Japanese Patent Application No. 44-10648 [phase] Application No. 44
(1969) February 13 @ inventor Yamamoto Yoshimasa 5 Minato-ku, Minami-Aoyama 5-5 4 Doha
Kiei Kawasaki City Minato-cho 125 Nippon Columbia Co., Ltd. Kawasaki Plant Co., Ltd. Shozo
Mizuno 10 Minabe City Mito 2 10 2 School Town 2 of 3 ■ Applicant Hokuetsu Paper Mills Co.,
Ltd. Tokyo Central Ward Nihonbashi Honishicho 3 4 same Japan Columbia Co., Ltd. Tokyo 14 14
14 [Fa] agent attorney at Akasaka Minato ward Tokyo Kazuhiro Yamaguchi
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment
of a speaker diaphragm according to the present invention, FIG. 2 is an enlarged cross-sectional
view of the main parts, and FIG. 3 is a diaphragm according to the present invention. It is a
frequency response curve figure of the speaker and the conventional speaker.
Detailed Description of the Invention The conventional diaphragm is based on plant fibers such
as wood pulp and the like, and animal fibers such as wool or synthetic fibers are added, and it is
appropriately beaten depending on the purpose of use to make the diaphragm to increase
rigidity. In addition, it is made to have low rigidity and bulky paper quality by impregnating and
curing synthetic resin such as phenol resin, or by a method such as non-pressing to have rigidity
30. However, when the former is impregnated and cured like a synthetic resin, rigidity is
increased but weight is also increased, so the efficiency of the speaker is lowered and the
reproduction limit of the high region is also lowered, and the latter non-press method In the case
of the following, it is porous, so the density is low and the mass for obtaining the same rigidity35 degrees is small (it is possible to obtain a diaphragm with good efficiency, but use a non-press
cone). -30 745. .. 40.. 1974)8カ、5.。 The number 2 (total 3 pages) of the invention also
causes a danger that the diaphragm may be broken if a large signal power is given to the
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speaker, and there is a drawback that the diaphragm becomes unusable once it is broken. The
present invention seeks to overcome the above drawbacks. That is, in the conventional
diaphragm manufacturing method, the fibers are beaten by a beating machine such as a beater to
swell the fibers and fibrillate to increase the surface area of the fibers (increase the bonding area
between the fibers). At the same time, the entanglement between fibers was increased to give the
strength of the paper. In this case, the bonding mode of the paper consists of mechanical bonding
such as entanglement between fibers and hydrogen bonding (by OH group of cellulose) such as
bonding between swollen fibers, but by the conventionally known diaphragm manufacturing
method. In the refining process, the bonding mode of paper is mostly mechanical bonding and
the portion of hydrogen bonds is small. Moreover, hydrogen bonding is stronger than mechanical
bonding. The inventors of the present invention have conducted various studies so that the interfiber bonds in the diaphragm are mostly hydrogen bonds without being the conventional
mechanical bonds, and as a result, the inter-fiber bonds become hydrogen. It has been found that
the combination of the combined material and the conventional mechanical combination
provides a vibrating plate having a large rigidity and a high strength, as well as a high-range
reproduction limit and a high expansion efficiency. That is, a raw material obtained by beating
and mixing a single type or a mixture of one or more types selected from cellulose fibers alone or
a group 4 animal fiber and other fibrous materials was formed into a paper by a cocoon and
dried at heating or normal temperature If the base paper is treated with a chemical solution that
simultaneously swells on the surface of the cellulose fiber, most of the interfiber bonds can be
formed as hydrogen bonds, and the strength dramatically increases.
As such a chemical solution, there are an aqueous solution of a concentration of a chloride such
as zinc, tin, calcium, aluminum, magnesium or the like, a concentrated sulfuric acid solution L <a
copper ammonium solution or the like. It is to be noted that those which are subjected to the
action of swelling and cementation by the above-mentioned chemical solution are limited to
cellulose fibers, and fibers are mixed by mixing fibers other than cellulose fibers. EndPage: Since
the mode of intervertebral bonding changes, fiber mixing can make a diaphragm with color
characteristics. Next, examples of the present invention will be shown. Examples IN, B, KP 60%,
DSP 20%, linterpulp 20%, with a freeness of 600 cc, made into an oat and dried at around 170 °
C. After dipping in a zinc chloride solution of 75′′Be for 20 seconds, take it out, remove the
excess portion of the aging agent for 1 minute, remove it with a small concentration chemical
solution, wash with pure water finally and dehydrate it, It is pressed by a mold heated to ° C to
perform a drying type 1 to make a diaphragm. In the diaphragm thus obtained, as shown in FIG.
2, the junction 3 between the fibers 2 becomes a hydrogen 4 junction. FIG. 3 is a 202 caliber
speaker and a conventional method using a wandering board obtained according to an
embodiment of the present invention. Frequency response curve measured for a speaker of the
same diameter using a diaphragm. In the figure, the lines are shown (the dotted lines are those of
the present invention. As shown, in the present invention, the reproduction limit of the high
frequency band is extended and the efficiency is increased by about 2 dB. Example 2 A blend of
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KP 50% and D8P 50% and having a freeness of 73 and a basis weight of 200 g / rrl is described
in Example 1 (Vibrations treated with a zinc chloride solution and those without and with
ordinary treatment) The Young's modulus of the plate was determined. It can be seen that the
diaphragm treated with the zinc chloride solution as shown below (as shown) is made strong with
a Young's modulus of 1 dog. Therefore, if a part other than the diaphragm 1 such as a voice coil
or a damper (2) capable of withstanding large input of the share of Sho. The present invention is
not limited to the embodiments described above, but the raw material composition of the base
paper, the type and concentration of the -5 chemical solution and the processing conditions, for
example, the temperature of the chemical solution, immersion time and aging time are changed
For the purpose, a suitable diaphragm can be obtained. Also in the above description, although
the case where the whole base paper is dipped and treated in the chemical solution is described,
the chemical solution is impregnated in an appropriate position of the base paper having the
same shape or the same shape as the shape io of the speaker. The same process as described
above can be used to obtain a diaphragm having a desired characteristic of stealing.
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