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JP2004320200

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DESCRIPTION JP2004320200
The present invention relates to a diaphragm for a speaker, and it is a problem that mold
releasability and dimensional stability deteriorate in injection molding of a polyolefin-based
material such as polypropylene, and pressure-pressure molding of a thin film. It solves the
problem that the correct shape which occurs in the above can not be obtained. According to the
present invention, a diaphragm 27 is formed by processing a non-oriented film made of a
polyolefin-based material such as a polypropylene film as the material thereof. With the above
configuration, the shape stability of the diaphragm 27 can be improved and cost reduction can
be achieved, and the internal loss, material thickness, weight, and rigidity can be optimized as the
speaker to improve the frequency characteristics, and adhesion can be achieved. It is possible to
improve the quality and the appearance quality. [Selected figure] Figure 1
Speaker diaphragm and speaker using the same
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
small-sized speaker diaphragm used in, for example, a portable telephone and the like, and a
speaker using the same. [0002] As a prior art in which a polyolefin material typified by
polypropylene is used for a speaker diaphragm, Patent Document 1 exists. [Patent Document 1]
Japanese Patent No. 2639126. [0004] When the diaphragm for a speaker is formed using the
above-mentioned material, it is usually formed by injection molding, but the injection is In
molding, it had the subject that mold release property and dimensional stability worsened. On the
other hand, although it is conceivable to pressure-mold a thin film, a film in which a crystalline
material is stretched has a problem that an accurate shape can not be obtained due to the
problem of anisotropy. The present invention solves the above-mentioned problems, and uses
polyolefin as a diaphragm for a speaker, preferably polypropylene, which is a good material for
the diaphragm with a large internal loss. Means for Solving the Problems In order to achieve the
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above object, the present invention has the following constitution. The invention described in
claim 1 of the present invention is one in which a non-oriented polyolefin film having a thickness
of 10 μm to 100 μm is formed into a predetermined shape. With this configuration, it is
possible to obtain an appropriate speaker diaphragm that can satisfy the internal loss required
for the speaker. The invention according to claim 2 of the present invention is configured by
secondarily forming a non-oriented polypropylene film having a thickness of 10 μm to 50 μm
into a predetermined shape. With this configuration, it is possible to obtain an appropriate
speaker diaphragm that can satisfy internal loss, material thickness, and weight required for the
speaker. The invention according to claim 3 of the present invention is one obtained by metal
deposition on both sides or one side of a non-oriented polyolefin film. With this configuration, it
is possible to obtain an appropriate speaker diaphragm that can satisfy the rigidity required for
the speaker. According to a fourth aspect of the present invention, a loudspeaker is configured by
using the diaphragm according to any one of the first to third aspects. With this configuration, it
is possible to satisfy the performance required for a micro speaker or the like represented by a
mobile phone. BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present
invention will be described below.
First Embodiment The invention according to the first aspect of the present invention will be
described below with reference to the first embodiment. The invention according to claim 1 of
the present invention is configured by forming a non-oriented polyolefin film having a thickness
of 10 μm to 100 μm into a predetermined shape. Specifically, the outer shape is circular, the
central portion is disk-shaped, and the outer peripheral portion is ring-shaped, each of which is
curved upward. An inexpensive diaphragm material having good acoustic characteristics
according to the present invention is to use a film containing a polyolefin, and examples thereof
include polypropylene, polyethylene and polyisobutylene. As a result of intensive studies, the
inventors of the present invention have found that it is desirable to process a film in order to use
a polyolefin-based material with a thinness that can correspond to a speaker diaphragm in terms
of shape stability and cost. It came to the conclusion that in the case of processing by molding,
pressure forming, vacuum molding, etc., this film needs to be a non-oriented film. That is, in the
first embodiment, a non-stretched polyolefin film having a material thickness of 10 μm to 100
μm is formed into a predetermined shape shown in FIG. 1 by press molding, pressure molding,
vacuum molding or the like. With this configuration, it is possible to obtain a diaphragm that can
satisfy the internal loss required for a micro speaker or the like. Second Embodiment The
invention according to the second aspect of the present invention will be described below with
reference to a second embodiment. In the second embodiment, a non-oriented polypropylene film
having a film thickness of 10 to 50 μm is formed into a predetermined shape by press molding,
pressure molding, vacuum molding or the like. By using such a polypropylene film, it is possible
to obtain a diaphragm which is desirable in terms of shape stability and cost, and which can
satisfy internal loss, material thickness and weight required for the microspeaker. Third
Embodiment The invention according to the third aspect of the present invention will be
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described with reference to the third embodiment. In the third embodiment, metal deposition is
performed on both sides or one side of the film of the first and second embodiments. As a metal
material to be deposited, aluminum and titanium are typical. With this configuration, the
diaphragm rigidity required for the micro speaker etc. can be satisfied by metal deposition. The
adhesion can also be improved by metal deposition.
Furthermore, by metal vapor deposition, it is possible to cope with diversification in design and
to improve the appearance quality. Fourth Embodiment The fourth embodiment of the present
invention will be described below with reference to the drawings using the fourth embodiment.
FIG. 1 is an invention according to claim 4 of the present invention, and is a structural crosssectional view of a speaker configured using the diaphragm according to claims 1 to 3. In the
speaker shown in FIG. 1, an inner magnet type magnetic circuit 24 is configured by sandwiching
the magnetized magnet 21 by the upper plate 22 and the yoke 23. A ring-shaped frame 26 is
coupled to the yoke 23 of the magnetic circuit 24. The disk-shaped diaphragm 27 according to
any one of claims 1 to 3 is adhered to the inner peripheral edge portion of the frame 26. Here,
the diaphragm 27 is obtained by processing a film made of a polyolefin-based material such as a
polypropylene film into the shape shown in FIG. In addition, metal deposition may be performed
on at least one of the front and back surfaces of the film. The upper end of the cylindrical voice
coil 28 is coupled to the lower surface of the diaphragm 27, and the lower portion of the voice
coil 28 is coupled so as to fit in the magnetic gap 25 of the magnetic circuit 24. . A material
thickness of about 13 μm to 25 μm is often used as a material thickness of the film of the
diaphragm 27. The material and thickness of the diaphragm 27 are desirable in terms of shape
stability and cost, and the internal loss, thickness and weight required for the microspeaker can
be satisfied. Further, by metal deposition, the rigidity of the diaphragm 27 can be improved, and
good frequency characteristics can be realized. Furthermore, it is possible to improve adhesion,
to cope with diversification in design, and to improve appearance quality. With the above
configuration, it is possible to provide a speaker that can satisfy the performance required for a
micro speaker represented by a mobile phone. As described above, according to the present
invention, a non-stretched film made of a polyolefin-based material such as a polypropylene film
is processed to constitute a speaker diaphragm. With these configurations, it is possible to
improve the shape stability of the diaphragm and to reduce the cost. In addition, the internal loss,
the material thickness, the weight, and the rigidity can be optimized to improve the frequency
characteristics.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a speaker according
to an embodiment of the present invention. [Explanation of symbols] 21 magnet 22 upper plate
23 yoke 24 magnetic circuit 25 magnetic gap 26 frame 27 diaphragm 28 voice coil
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