LOUDSPEAKER DIAPHRAGM, LOUDSPEAKER, ELECTRONIC DEVICE, MOVABLE BODY, AND METHOD OF MANUFACTURING LOUDSPEAKER DIAPHRAGM
A loudspeaker diaphragm that includes a resin containing silica derived from seed coats and a compatibilizer as an additive.
1 . A loudspeaker diaphragm comprising:
a resin containing silica derived from seed coats and a compatibilizer as an additive.
2 . The loudspeaker diaphragm according to claim 1 , wherein
a content of the silica derived from the seed coats in the resin is at least 1 wt % and at most 50 wt %, and
a content of the compatibilizer in the resin is at least 0.1 wt % and at most 10 wt %.
3 . The loudspeaker diaphragm according to claim 1 , wherein
the silica derived from the seed coats is amorphous silica obtained by burning the seed coats at a temperature of at least 300 degrees Celsius and at most 700 degrees Celsius.
4 . The loudspeaker diaphragm according to claim 3 , wherein
the silica derived from the seed coats is not ground after burning.
5 . The loudspeaker diaphragm according to claim 1 , wherein
the silica derived from the seed coats retains approximate shapes of the seed coats.
6 . The loudspeaker diaphragm according to claim 1 , wherein
the seed coats are chaff.
7 . The loudspeaker diaphragm according to claim 1 , wherein
a particle diameter of the silica derived from the seed coats is less than or equal to 300 microns.
8 . The loudspeaker diaphragm according to claim 1 , wherein
the compatibilizer is maleic anhydride-modified polypropylene (PP).
9 . The loudspeaker diaphragm according to claim 1 , wherein
the compatibilizer is hydrolyzable long-chain alkylsilane.
10 . The loudspeaker diaphragm according to claim 1 , wherein
the compatibilizer is a silane coupling agent.
11 . The loudspeaker diaphragm according to claim 1 , wherein
the compatibilizer is a modified resin that is modified with maleic anhydride.
12 . A loudspeaker comprising:
the loudspeaker diaphragm according to claim 1 ;
a magnetic circuit;
a frame that holds the magnetic circuit and the loudspeaker diaphragm; and
a voice coil body including one end joined to the loudspeaker diaphragm and an other end disposed in a magnetic gap of the magnetic circuit.
13 . A method of manufacturing a loudspeaker diaphragm, the method comprising:
burning seed coats at a temperature of at least 300 degrees Celsius and at most 700 degrees Celsius to obtain amorphous silica;
adding a compatibilizer to a thermoplastic resin containing the amorphous silica, kneading the compatibilizer and the thermoplastic resin, and producing pellets; and
forming the pellets into a loudspeaker diaphragm to manufacture the loudspeaker diaphragm.
14 . An electronic device comprising:
the loudspeaker according to claim 12 ; and
an amplifier circuit for an input signal to the loudspeaker.
15 . A movable body comprising:
the loudspeaker according to claim 12 .