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US 9,438,997 B2Granted
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
Life of this patent
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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.
Claims20
A diaphragm comprising:
- a paper layer including natural fibers and synthetic fibers formed of thermoplastic resin;
- and
- a skin layer formed of a same thermoplastic resin as the thermoplastic resin of the synthetic fibers and formed on one surface of the paper layer,
- wherein tensile strength in a circumferential direction of the diaphragm is more than one time and 1.5 times or less as high as tensile strength in a direction from a center to an outer periphery of the diaphragm,
- the natural fibers have a beating degree of 200 ml or more and 700 ml or less in Canadian Standard freeness, and
- a length of each of the natural fibers is 0.8 mm or more and less than 3 mm.
3 more elements
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 a same thermoplastic resin as the thermoplastic resin of the synthetic fibers and formed on one surface of the paper layer,
- wherein tensile strength in a circumferential direction of the diaphragm is more than one time and 1.5 times or less as high as tensile strength in a direction from a center to an outer periphery of the diaphragm,
- the natural fibers have a beating degree of 200 ml or more and 700 ml or less in Canadian Standard freeness, and
- a length of each of the natural fibers is 0.8 mm or more and less than 3 mm.
7 more elements
Dependencies are inferred from the claim text.