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Description 1, title of the invention
Diaphragm for audio equipment and method of manufacturing the same
Detailed Description of the Invention The present invention provides an integral first layer of
many carbon micro-hollows and carbonized synthetic resin, continuous on one or both sides of
this first layer, in the plane direction The present invention relates to a diaphragm for an acoustic
device such as a speaker or a microphone including a second layer made of carbon having
elasticity, and a method of manufacturing the same. EndPage: A thin plate generally used as a
diaphragm of an acoustic device, especially a busy speaker, is light in weight, high in rigidity, and
high in weight and density in order to reproduce faithfully over a wide frequency band. A large
ratio R / ρ to 必要 is required. From these points of view, materials such as wood panel 1
synthetic resin, aluminum, titanium and the like have been conventionally used, but it has been
difficult to say that all of them have sufficient properties. An example using a carbon-based
material is a composite material of carbon fiber and synthetic resin or wood pulp, but carbon
fiber by a synthetic resin or wood valve because of the lubricity of the surface possessed by
carbon fiber itself As a result, the surface was not made as stiff as the diaphragm due to the large
μ-direction of the fibers. On the other hand, 1) a micro hollow body is made of various materials,
and the diaphragm made of the simple aggregate or the composite with a synthetic resin is
lightweight, but it has a large 1itil property Not obtained. Also, in the case of carbon micro
hollow bodies, they do not melt even at high temperatures, so the assembly is put into a mold
and heated. It did not bond and molding was difficult. In addition, the aggregate of micro hollow
bodies of carbon-containing organic substances such as pitch is pyrolyzed in a mold to carbonize
the organic substances, and a diaphragm for a slider is formed by combining carbonized micro
hollow bodies. Although a method has been proposed, in this method, the carbonized diaphragm
is produced by the rupture of the micro hollow body due to the thermal expansion pressure of
the air in the organic micro hollow body or the volatile component of the organic substance upon
heating for carbonization. It was brittle, prone to cracking, and was unsuitable as a diaphragm.
The object of the present invention is to obtain a strong bond of carbon micro hollow body by
carbonizing or further graphitizing the synthetic resin in a system of a mixture of a synthetic
resin and an organic or carbon micro hollow body in view of the above points And a diaphragm
having a feature that the light weight is large and the internal loss is also large, from the
knowledge that it forms a second layer of carbon having continuity on one side or both sides of
this system. It is intended to provide a manufacturing method. The details of the present
invention will be described according to the following examples. The figure shows a partially
enlarged cross section of the diaphragm according to the present invention, and this diaphragm
is a carbonized or graphitized thermoplastic resin with many carbon micro-hollows 1 having a
particle size of several μ to several tens of μ. Or a first layer 10 of thermosetting synthetic resin
2 and a second layer of carbon laminated on one side or both sides of the fourth layer 10 and
having continuity along the plane direction It is made of 20 ° 20 and is formed into a desired
shape such as a dome shape or a cone shape to be a diaphragm.
With such a configuration, properties with high internal loss, small apparent density and
relatively high blowout rate are obtained from the first layer 10, and t I + high Young's modulus
and reinforcement Obtained from the second layer 20.20. Example 1 A carbon micro hollow
body having a bulk density of about 0.3 f / + 11 and a furan resin are mixed at an apparent
volume ratio of 7: 3 and then end page: molded and cured in a mold of two desired shapes to
obtain a composite The resulting composite is heated to a temperature of 1000 ° C. in an inert
gas atmosphere and fired at a temperature rising rate of about 0 ° C./hour. The composite is
coated on both sides with a kneaded composite of vinyl chloride, graphite and methyl ethyl
ketone and heated to about 300 ° C. for about 8 hours and then opened at about 1000 ° C. for
1 hour. Baking. Carbonize the composite and the vinyl chloride composite. The diaphragm thus
obtained has a sandwich structure in which a low density first layer containing carbon micro
hollow bodies is sandwiched by a carbonized second layer of a high modulus polyvinyl chloride
composite. And its bulk density ti 0.7 f / i, Young's modulus is 6D00 Kf /-, and combined with the
large internal loss in the first layer containing carbon and micro hollow body, the reduction of
the harmonic distortion of the speaker, transient It is possible to realize the improvement of the
characteristics. In addition, when using the synthetic resin of the same component as the
synthetic resin used as a matrix at the time of mixing a carbon micro hollow body to form the
said sandwich structure also for coating of the core material containing a carbon micro hollow
body It is also possible to form the diaphragm in the single carbonization step of the matrix resin
and the coating resin simultaneously in the single carbonization step without undergoing the
above-mentioned two busy carbonization steps as described above. The carbonization conditions
are not limited to the above steps. Example 2 An organic micro hollow body. A bulk density of
0.2 f / d phenolic resin micro-body and 7-run resin are mixed at a blind volume ratio of 7: 3 and
molded in a mold of a desired shape to obtain a composite. Is the complex inert atmosphere
1000 m? The mixture is heated and fired at a temperature rising rate of about 0 ° C./hour to
obtain a carbonized molded product. At this time, since deformation between the temperature of
400 and 500 ° C. is remarkable, it is desirable to gradually increase the temperature during this
period so that cracking or the like does not occur as much as possible regardless of the
temperature rising rate. . This molding is used as a base in a heating furnace, and the inside of
the furnace is replaced with argon, and after that, at 1250 ° C., argon and about 5 volumes of
methane thereof are added to the surface of the molding (base) To deposit carbon on one surface
by thermal decomposition to obtain a diaphragm integrated with the molding.
Because the pyrolytic carbon film has high density and high elastic and dense characteristics
such as density 2, Of / cIi and Young's modulus of 4/6000, it is possible to provide better one
than the diaphragm obtained according to the above-mentioned Example 1 Ru. Example 1 above.
In the invention according to Example 2, in addition to furan resin as synthetic resin and organic
micro hollow body, phenol and vinyl chloride. It may be used as a simple blend of other synthetic
resins such as polyester, or as a mixture of several. In addition, when mixing the micro hollow
body and the resin, it is also possible to use a plasticizer, a filler, a solvent, etc. according to need.
In this case, the resin is appropriately selected and used, Alternatively, the heat treatment φ of
graphitization may be appropriately adjusted by the mixture system of resin, plasticizer and
solvent, respectively. In addition, if the diaphragms obtained in Example 1 and Example 2 and
having EndPage: 3 are held by a graphite mold so as not to be deformed, they are graphitized
under the sintering conditions of a temperature of 2000 ° C. or more in an inert atmosphere.
Further, a diaphragm having a high Young's modulus can be obtained, and one having excellent
characteristics can be obtained.
4 is a diagram showing a partially enlarged cross section of the diaphragm of the present
invention, a simple explanatory view of the drawings. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · carbonized or graphitized synthetic resin 10 · · · · first layer 20 · · · · Second layer patent
applicants Pioneer Corporation Page 1 continued 0 Inventors Arai Ihara 2 Tokyo Metropolitan
Ota-ku Omori-ku 4-Chome 15-5 No. 5 Pioneer Corporation Omori Factory EndPage: 4
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