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US 2015/0319532 A1Published application
Diaphragm, loudspeaker using diaphragm, electronic device and mobile device using loudspeaker, and method for producing diaphragm
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsYOHEI JIN, YOSHIMICHI KAJIHARA
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Abstract
A diaphragm includes a paper layer and a skin layer. The paper layer includes natural fibers and synthetic fibers formed of thermoplastic resin. The paper layer is formed by mixing the natural fibers and the synthetic fibers in water, and thinly spreading a resultant mixture on a mesh. The skin layer is formed on one surface of the paper layer. Note here that the skin layer is formed of the same resin as that of the synthetic fibers.
Claims27
A diaphragm comprising:
- a paper layer including natural fibers and synthetic fibers formed of thermoplastic resin;
- and
- a skin layer formed of the same resin as that of the synthetic fibers and formed on one surface of the paper layer.
A loudspeaker comprising:
- a frame;
- a magnetic circuit bonded to the frame and provided with a magnetic gap;
- a voice coil inserted into the magnetic gap;
- and
- a diaphragm bonded to a periphery of the frame and including:
- a paper layer including natural fibers and synthetic fibers formed of thermoplastic resin, and
- a skin layer formed of the same resin as that of the synthetic fibers and formed on one surface of the paper layer.
4 more elements
A method for manufacturing a diaphragm, the method comprising steps of:
- producing a precursor having a first surface and a second surface opposite to the first surface by depositing a mixture of natural fibers and synthetic fibers made of thermoplastic resin on a mesh;
- and
- forming a skin layer made of the resin only on the first surface by heating and pressing the precursor to melt a part of the synthetic fibers, so as to form the diaphragm.
Dependencies are inferred from the claim text.