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■ Method of manufacturing a speaker diaphragm ■ Japanese Patent Application No. 44-61528
[phase] Application No. 44 (1969) Aug. 4 @ inventor Hiroaki Kuwahara Koganei Heavy
punishment 20 of 70 applicants Foster Electric Co., Ltd. Akishima City Miyazawa Town 512
[Phase] Agent Patent Attorney Takayama Dissatisfaction
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows one of the molds used for heat forming of
a conventional loudspeaker diaphragm, FIG. 2 the same as the other, and FIG. 3 the fabrication of
loudspeaker diaphragms according to the invention It is an example of a conical heat melting
adhesive film.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement
of the method of manufacturing a loudspeaker diaphragm. The speaker diaphragm is usually
beaten with vegetable fibers such as paper pulp, dissolved in a fixed amount of water and
machined with a conical wire mesh, appropriately dewatered and then heat-formed with a conical
mold. Make. The shape as the speaker diaphragm is mainly determined by the shape of the mold
used for heat forming, but the internal structure of the diaphragm is the beating of paper pulp
etc. which is a raw material, the mixing ratio thereof, the resin to be added, the resin to be made
It is determined by the flow velocity of water at each portion, the moisture content at the time of
heat forming, the forming temperature, and the like. Since the speaker diaphragm is required to
have a different internal structure depending on the application, the purpose is achieved by
combining the above-mentioned respective elements in the manufacture. However, since these
elements often fluctuate due to slight errors in the manufacturing process and sometimes do not
obtain the required internal structure that is the original purpose, they cause great care and
enormousness in manufacturing [111111]. Requires administrative expenses. The present
invention aims to ameliorate these difficulties in the production of loudspeaker diaphragms and
to produce diaphragms of stable quality. In FIG. 1, reference numeral 1 denotes a mold used for
heat forming of a normal speaker diaphragm. In the practice of the present invention, a release
agent is coated on the surface of the mold in advance. If a large amount of 0-2 to 5 mm of cut
fibers of natural or synthetic fibers or both mixed above this mold is prepared, and the mold
negative voltage is applied to the fibers, an extremely high positive voltage is applied to these
fibers. Uniformly adhere to mold one vertically. After sufficient adhesion of the fibers, the voltage
is removed, and if the mold 2 shown in FIG. 2 is preheated and the two molds 1 and 2 are
combined and crimped, the synthetic fiber is welded by heat. As a result, a conical body of
uniform thickness is produced as the diaphragm of the speaker. When using natural fibers, if a
heat melting adhesive solution is allowed to pass in advance before cutting the fibers short, the
adhesive attached to the surface of the fibers melts during heat forming, so that the diaphragm It
is effective to keep the shape. As the raw material fibers, several types can be mixed as described
above, but it is also possible to mix several types of fibers of different lengths. When the
diaphragm is manufactured by this method, the steps of beating and paper making are not
necessary at all, and the man-hours required for manufacturing can be greatly shortened as
compared with the usual method, and fibers as raw materials are optionally selected. In addition
to being selectable, it is possible to mix in a very stable state, and its operation is extremely easy
as compared to the method of collapsing fibers that have been beaten in a fixed amount of water.
FIG. 3 shows a film 3 of a hot-melt adhesive which is preformed into a conical shape and
provided with a large number of appropriate holes. [111111] EndPage: The film 3 is placed on
the surface of the mold of FIG. 1 and the raw material is attached and heat-formed as described
above, the film is melted by heat and fused to the attached fiber to vibrate. The part
corresponding to the hole of the film is soft but the other part is solid (it can be finished, so the
internal loss at the time of operation of the diaphragm has different values, so it is necessary for
the structure of the diaphragm Different parts of the internal loss can optionally be provided by
the arrangement of the holes in the film. Usually, it is extremely difficult to obtain such an effect
with the method of manufacturing the diaphragm. In addition, non-woven fabric, paper, or
ordinary cloth may be interposed between the film and the mold of FIG. 1 for heat molding, or
these non-woven cloth, paper, cloth or the like may be used in advance without using a film. It is
added that a heat melting adhesive may be applied and used. As described above, according to
the present invention, water is not used for the preparation of raw materials, as compared to the
conventional method of manufacturing a diaphragm. (2) The raw materials can be mixed in a
normal state. (3) The internal structure of the diaphragm can be determined arbitrarily. (4) The
manufacturing process is simple and can be operated by an automatic machine. (5) Therefore, it
is possible to manufacture 1111111 a large number of diaphragms of constant quality. And
other features.
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