Speaker, speaker-use diaphragm, dust cap, production methods and production devices for them
A speaker diaphragm or a dust cap formed by injection molding a mixture at least containing a resin material and a fiber material. The speaker diaphragm or the dust cap combines the advantages of both a paper diaphragm and a resin diaphragm. The advantage of a paper diaphragm is a large degree of freedom in setting physical properties. The advantages of a resin diaphragm are being excellent in moisture resistance reliability, strength, external appearance, productivity and dimension stability.
1 . A speaker comprising a diaphragm, wherein
the diaphragm is a injection-molded product made of a mixture containing a resin material and a fiber material.
2 . The speaker of claim 1 further comprising a dust cap attached to the diaphragm, wherein
the dust cap is an injection-molded product made of a mixture containing the resin material and the fiber material.
3 . The speaker of claim 1 , wherein
the resin material is a crystalline olefin resin or an amorphous olefin resin.
4 . The speaker of claim 1 , wherein
the resin material is one of polypropylene and engineering plastic.
5 . The speaker of claim 1 , wherein
the fiber material contains at least one of wood fiber, leaf fiber, bast fiber, seed fiber, fruit fiber, stem fiber and animal fiber.
6 . The speaker of claim 5 , wherein
the wood fiber contains at least one of craft pulp and sulfite pulp.
7 . The speaker of claim 1 , wherein
the mixture is added with reinforcement.
8 . The speaker of claim 1 , wherein
the fiber material has a fiber length of 0.2 mm to 20 mm.
9 . The speaker of claim 1 , wherein
the mixture contains 5% to 70% in weight of the fiber material.
10 . The speaker of claim 2 , wherein
one of the diaphragm and the dust cap is black or natural color.
11 . The speaker of claim 2 , wherein
one of the diaphragm and the dust cap includes the resin material and the fiber material, which are different in color from each other.
12 . The speaker of claim 11 , wherein
one of the diaphragm and the dust cap includes the resin material, which is transparent or semi-transparent.
13 . A diaphragm for speakers, the diaphragm being an injection-molded product made of a mixture containing a resin material and a fiber material.
14 . The diaphragm of claim 13 , wherein
the resin material is a crystalline olefin resin or an amorphous olefin resin.
15 . The diaphragm of claim 13 , wherein
the fiber material contains at least one of wood fiber, leaf fiber, bast fiber, seed fiber, fruit fiber, stem fiber and animal fiber.
16 . The diaphragm of claim 13 , wherein
the mixture is added with reinforcement.
17 . The diaphragm of claim 13 , wherein
the fiber material has a fiber length of 0.2 mm to 20 mm.
18 . The diaphragm of claim 13 , wherein
the mixture contains 5% to 70% in weight of the fiber material.
19 . The diaphragm of claim 13 , wherein
the diaphragm is black or natural color.
20 . The diaphragm of claim 13 , wherein
the diaphragm includes the resin material and the fiber material, which are different in color from each other.
21 . The diaphragm of claim 20 , wherein
the diaphragm includes the resin material, which is transparent or semi-transparent.
22 . A dust cap for speakers, the dust cap being an injection-molded product made of a mixture containing a resin material and a fiber material.
23 . The dust cap of claim 22 , wherein
the resin material is a crystalline olefin resin or an amorphous olefin resin.
24 . The dust cap of claim 22 , wherein
the fiber material contains at least one of wood fiber, leaf fiber, bast fiber, seed fiber, fruit fiber, stem fiber and animal fiber.
25 . The dust cap of claim 22 , wherein
the mixture is added with reinforcement.
26 . The dust cap of claim 22 , wherein
the fiber material has a fiber length of 0.2 mm to 20 mm.
27 . The dust cap of claim 22 , wherein
the mixture contains 5% to 70% in weight of the fiber material.
28 . The dust cap of claim 22 , wherein
the dust cap is black or natural color.
29 . The dust cap of claim 22 , wherein
the dust cap includes the resin material and the fiber material, which are different in color from each other.
30 . The dust cap of claim 29 , wherein
the dust cap includes the resin material, which is transparent or semi-transparent.
31 . Electronic equipment comprising a speaker, wherein
the speaker including a diaphragm and a dust cap, and
the diaphragm and the dust cap are injection-molded products made of a mixture containing a resin material and a fiber material.
32 . The electronic equipment of claim 31 being equipment mounted on a car.
33 . A method for manufacturing one of a diaphragm and a dust cap, the method comprising:
wet mixing a fibrous resin and a filler;
forming a primary composite material by dehydrating a mixture of the fibrous resin and the filler;
grinding the resin into a granular form;
forming a secondary composite material by mixing the primary composite material with the resin in the granular form; and
injection molding the secondary composite material.
34 . The method of claim 33 , wherein
the forming of the secondary composite material includes substituting the resin for moisture.
35 . The method of claim 34 , wherein
the substituting is granulating a mixture of the primary composite material and the granular resin by drying with heat.
36 . The method of claim 33 further comprising:
palletizing the secondary composite material.
37 . The method of claim 33 further comprising:
adding reinforcement or a diluent resin, the adding being performed during or after the forming of the secondary composite material.
38 . A device for manufacturing one of a diaphragm and a dust cap, the device comprising:
a device for wet mixing a fibrous resin and a filler;
a dehydrator for dehydrating a mixture of the fibrous resin and the filler, thereby forming a primary composite material;
a grinder for grinding resin into a granular form;
a mixer for mixing the primary composite material and the resin in the granular form, thereby forming a secondary composite material; and
an injection molder for molding the secondary composite material.
39 . The device of claim 38 further comprising:
a mixer for mixing the secondary composite material and one of a reinforcement-containing resin material and a diluent resin.