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JPS5365719

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DESCRIPTION JPS5365719
Description 1, the title of the invention
Method of mounting diaphragm for electric sound J equipment
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing a loudspeaker plate for an electronic writing instrument such as a speaker, a
microphone, and a force / tile of a pickup cartridge. Conventionally, as a diaphragm of highelasticity carbon 3LJt fiber used as the diaphragm for this kind of airy sound 4 device, there are,
for example, those mixed with wood pulp and those separated into epoxy resin, Is the rigidity low
as the resin is an matrix material, and is it high in the carbon fiber self-germination? l! (1)
Carbon fibers to each other due to the weakness of the observation force with the matrix material
generated from slippery) The stillness ratio of carbon fibers peeled off by mechanical bonding is
the elastic modulus as a diaphragm integral It was not possible to use 0 effectively. Here, the
present invention solves the above-mentioned conventional drawbacks and disperses high elastic
modulus carbon fibers in a synthetic resin matrix which is carbonized without melting when
heated EndPage: 1 in a non-oxidizing atmosphere. Forming a composite material, pressing and
molding the composite material followed by firing in a non-oxidative atmosphere to graphitize,
thereby causing a mechanical bond between carbon fibers in the graphitized synthetic resin and
rematrix It is an object of the present invention to provide a method of manufacturing an
imaging plate for an electrical four-piece appliance having a high elastic modulus by drawing.
Method of mounting diaphragm for electric sound J equipment
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Hereinafter, the present invention will be described in detail as a synthetic resin used as a matrix
in the present invention (for example, VA heat to ン 0 heat in unrefined 注 、 、 な く,
carbonized without I 8 melting O, eg Ingredients of furan resin, phenolic resin, furfuryl alcoholbased resin, etc., or their # and fats are used. Then, a carbon fiber of high elastic modulus, or a
woven fabric thereof is dispersed in a matrix of the above synthetic resin to form a composite in
advance, and then the composite is added to a desired shape of a diaphragm such as a speaker or
a microphone. It is pressure molded and cured. The fJ4j1 composite material is heated in an inert
gas such as argon and helium, a non-oxidizing atmosphere such as nitrogen and a salt vapor, at a
temperature of 200 ° C. or higher, preferably 400 to 1000 ° C. Baking for 10 hours, then, in
the history, temperature rising speed kic te 2000. A matrix such as the furan resin is graphitized
by pressurizing to a temperature at which carbon substantially sublimes to a temperature of at
least 300 ° C. and 300 ° C. or more. The matrix of the synthetic resin graphitized in this
manner firmly bonds the carbon fibers of still elastic modulus dispersed in the matrix or the
woven cloth of the carbon fibers together with the matrix itself and the carbon fiber bundle. By
being familiar with the bonding with the woven fabric, it is possible to strengthen the mechanical
connection of the entire diaphragm and obtain a diaphragm with a high elastic modulus. Next,
the present invention will be described in one embodiment in order to make it more specific, but
in this embodiment, a synthetic resin used as a matrix material will be described with reference
to furan-based resin. However, it goes without saying that the present invention is not sleepy as
described above. For example, a carbon fiber having an elastic modulus of 4000 Kf /-is further
impregnated into a furan-based resin to form a composite material having a furan-based resin as
a matrix, and this composite material is used as a speaker, a microphone, a pickup cantilever, etc.
The pressure plate is molded into the shape of a desired vibration plate of a typical vibration
plate and cured. After that, in an inert atmosphere such as argon, neon, etc., the matrix of S-fla /
based denture d having the carbon fiber dispersed therein is calcined at 600 ° C. for 6 hours,
and further 1 hour Heating to 2600 ° C at a temperature rising rate of 1000 ° C and
graphitizing, the vibration of condensed 1.1 / i · elastic modulus 23000 // · · specific elastic
modulus (elastic 4 / density) 16 × 10 '瓢I got a board. By the way, the high frequency
reproduction resonance frequency of the speaker is proportional to the specific elastic modulus
of the diaphragm if other conditions are the same.
Incidentally, there are aluminum and titanium as EndPage: 2 materials conventionally used as a
diaphragm, but the specific modulus of aluminum is 2.7 × 10′Flll, similarly titanium is 2.6 ×
10 ′ + m, and carbon fiber is an epoxy resin material. The diaphragm obtained according to the
present invention is approximately 1.4 times as large as that of the conventional imaging plate
obtained from the epoxy resin matrix, as compared with the conventional diaphragms dispersed
with IJ socks of 12 × 10′m respectively. As described above, according to the present
invention, carbon fibers dispersed in a synthetic # fat matrix or their woven cloths can be
strongly bonded to each other and a resin matrix such as the above-mentioned furan system, etc.
By strengthening the bond with the carbon fiber or the woven fabric, it is possible to obtain a
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mechanical plate with high mechanical strength and still high elastic modulus as a whole.
According to the light, the vibrating diaphragm has a 1.4-fold lower blood frequency compared
to such a conventional moving plate containing carbon fiber in an epoxy resin matrix, and thus
the same high frequency resonance frequency. In this case, it is possible to achieve lightening,
and further, according to the present invention, it is sufficient to impregnate the reverse fiber or
its woven fabric in the synthetic side fat as a matrix, and reduce the tree content to a low level.
Therefore, it is possible to reduce the heat convergence even when firing the workpiece in the
middle of the manufacturing process, and the product dimensions! tI: There are effects such as
being superior to ya. Patent applicant Pioneer Corporation procedure amendment (sponsored)
February 10, 1977, Secretary of Patent Office President Katayama Ishibe ■, display of the case
1959 patent application No. 140 694 3, person with correction Case 1 with child case Patent
applicant's address Tokyo Meguro-ku P1 chome 4 check number-: Name T7 +: (501) □ 'Ionia
Inc., 2 soldiers-name 4 agents, 8 agents, correction contents as per attached sheet Japanese
Patent Application No. 51-140694 ') (1) It is deleted that what is described as "cantilever of the
pickup cartridge" on pages 2 and 1 of the specification. (2) Patent Application Pioneer
Corporation, Inc. End Page: 3
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