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Patent application: Showa 50, 1 特許 1 Patent office secretary: Hideo Saito 1, the title of the
invention, the diaphragm 4 for the speaker, the agent cloud 160 ■ Japan Patent Office ■
Japanese Patent Application ■ JP-A 52-490180 (1977) 4.19 Japanese Patent Application No. 1;
'0- /, 2 (17, 21 [phase] Application date Akira Akira (197, fi / 、, 1 request for examination not
yet filed (all 2 pages) organization in the Office No. l u, rt-Name of specification description
Speaker diaphragm for speaker
The present invention relates to a diaphragm for a speaker, and more particularly to a diaphragm
for a speaker using a diaphragm material modified with sodium hypochlorite or the like as a
diaphragm for a speaker. Heretofore, various types of loudspeaker diaphragms have been used.
However, as the loudspeaker materials, those having small specific gravity and appropriately
large Young's modulus and internal loss have been selected. The valve used as a material is often
used as a speaker diaphragm [7, but its Young's modulus and internal loss] are small, and by
subjecting the valve material to various processing. Efforts are made to increase internal loss and
reduce specific gravity. As one of those diaphragms, a synthetic resin was mixed in the pulp
before the paper making process. A thing, what mixed inorganic fiber, organic fiber (except for a
valve), etc. are known. Other diaphragms are made by applying or impregnating a synthetic resin
on a diaphragm made of paper and dried, and as other diaphragms, and one side or both sides of
the diaphragm inside compared with pulp material It has been proposed that a sheet of synthetic
resin foam having a relatively large loss, a piece of cloth, or a metal plate with a small specific
gravity be attached to a diaphragm. In each of the above-described conventional examples, heavy
duty is increased compared to the one made of a single material of only a par j rep, and the
material condition as a diaphragm is not satisfied. Also, from the viewpoint of production, in the
case of the conventional example of sugar 1 described above, the dispersion of the synthetic
resin, inorganic fiber, etc. can be made uniform, and in the case of the second conventional
example, the synthetic resin attached to the diaphragm The characteristics are not stable because
the coating amount and the impregnation amount are not constant. Furthermore, in the case of
the third conventional example, there is a disadvantage that the process of attaching the foam
sheet or the metal plate to the diaphragm takes a lot of time. Therefore, the main object of the
present invention is to provide a speaker diaphragm from which the conventional EndPage: 1
defect as described above has been eliminated, and its feature is to uniformly modify the pulp
material for paper making by chemical treatment. In order to obtain a pulp material having a
certain characteristic (also, when the diaphragm is made with this, it is possible to measure the
stabilization of the characteristic). That is, as a chemical to be added to the pulp material, sodium
hypochlorite as an oxidizing agent, sodium sulfite or a combination thereof can be used, water is
added to the dissociated pulp material and the above-mentioned chemical is added while stirring.
Add an appropriate amount 1 and shake or stir on a water bath for a predetermined time. During
this time, the solution has a predetermined pH. The pulp is thoroughly washed with warm water
and then cold water, then dewatered and dried.
The dried pulp is made into a pulp slurry of appropriate concentration with water, or it is
subjected to beating treatment and made into a paper sheet as a vibrating plate. The examples of
the present invention will be described in detail below. EXAMPLE 1 29 parts of water is added to
1 part by weight (hereinafter referred to simply as part) of a softwood non-bleaching sulfate
valve (absolutely dry) which has been deaggregated. While stirring this, 0.5 to 2 parts of sodium
hypochlorite is added, and the mixture is sufficiently stirred. Next, it is treated with PH8411 of
the solution for 5 hours while stirring or shaking on a 45 to 50C water bath. The treated pulp is
immediately washed thoroughly with 50 to 60 C of warm water and cold water (to pH 7) and
then dewatered and dried to make a diaphragm using the produced pulp as a raw material.
EXAMPLE 2 29 parts of water is added to 1 part of the same pulp as above, 01 to 5 parts of
sodium hypochlorite is added, and the mixture is sufficiently stirred. Next, 1 chlorite soda 0.01 to
0.02 f! Add A little by little and mix thoroughly. This is treated with PH 9-11 of the solution for 2
hours while stirring or shaking on a 35-40 C water bath. The pulp is immediately washed
thoroughly with 40 to 50 c of hot and cold water, and the dewatered and dried pulp is used as a
raw material [7] to make a diaphragm. Here, in order to compare the physical characteristics of
the diaphragm according to the present invention and the diaphragm comprising the pulp
material not subjected to the chemical treatment, the pulp according to Examples 1 and 2 and
the pulp not subjected to the chemical treatment are in accordance with JIS-P-8209 A hand-made
sheet for test was made, and the results of measurement tests of Young's modulus and internal
loss by density and vibration reed method of papermaking are shown below. Chemical treatment
not applied Chemical treatment Pulp density (g, Q) 0.450.41 to 049 Young's modulus eyt) 11 x 1
d 0 0.4 x 1 d 0 to 1, 5 x 1 d 02-2 Internal loss (tans) As can be understood from the above
numerical example, the internal loss and the Young's modulus can be largely changed by
appropriately adjusting the amount of the additive to the drug, as described in the above
numerical example. As described above, the speaker diaphragm according to the present
invention has the Young's modulus by modifying the pulp by chemical treatment of the pulp
material and changing the amount of chemical addition without changing the density of the
diaphragm. And the amount of internal loss may be selected accordingly. (1) There is no risk of
throwing organic solvents used for coating or impregnating synthetic resin into the atmosphere,
which is harmful to human health, so it is good for sanitation, and a large amount of pulp
material can be treated chemically for production. Can be held low. Further, the above-mentioned
speaker using the moving plate according to the present invention is characterized in that after
forming the diaphragm, a speaker can be obtained which reproduces good sound with a flat
frequency characteristic without any processing. It is.
Patent applicant Nippon Columbia Ltd. · (袂 'EndPage: 2