Speaker diaphragm and speaker structure
View Patent ↗A speaker diaphragm includes a base material impregnated with a thermosetting resin composition. The base material includes a first surface material, a core material, and a second surface material in the stated order; the first surface material and the second surface material are each formed of a woven fabric or a non-woven fabric; and the core material is formed of a woven fabric or a non-woven fabric each including hollow fine particles.
1. A speaker diaphragm comprising a base material impregnated with a thermosetting resin composition, wherein:
the base material comprises a first surface material, a core material, and a second surface material in the stated order;
the first surface material and the second surface material are each formed of a woven fabric or non-woven fabric, which does not include hollow fine particles;
the core material is formed of a woven fabric or non-woven fabric, including hollow fine particles.
2. A speaker diaphragm according to claim 1 , wherein one of the woven fabric and the non-woven fabric forming the core material is formed of a polyester fiber.
3. A speaker diaphragm according to claim 1 , wherein the core material is formed of one of a woven fabric and a non-woven fabric each having the hollow fine particles dispersed in a middle part of the core material in a thickness direction.
4. A speaker diaphragm according to claim 3 , wherein the core material has through-holes.
5. A speaker diaphragm according to claim 1 , wherein the core material is formed of one of a woven fabric and a non-woven fabric each including a plurality of cells formed with gaps between one another, and each cell including the hollow fine particles.
6. A speaker diaphragm according to claim 5 , wherein the plurality of cells each have at least one shape selected from the group consisting of a spherical shape, a cylindrical shape, and a polygonal columnar shape.
7. A speaker diaphragm according to claim 1 , wherein the hollow fine particles each have a particle size of 15 to 90 μm.
8. A speaker diaphragm according to claim 1 , wherein the hollow fine pan ides each have a density of 0.03 to 0.06 g/cm 3 .
9. A speaker diaphragm according to claim 1 , wherein the first surface material and the second surface material are each formed of one of a woven fabric and a non-woven fabric of a fiber selected from the group consisting of a high-elastic modulus fiber, a natural fiber, and a regenerated fiber.
10. A speaker diaphragm according to claim 9 , wherein the woven fabric has a surface density of 100 to 300 g/m 2 .
11. A speaker diaphragm according to claim 9 , wherein the non-woven fabric has a surface density of 30 to 150 g/m 2 .
12. A speaker diaphragm according to claim 9 , wherein the high-elastic modulus fiber comprises at least one fiber selected from the group consisting of a carbon fiber, a polyester fiber, and an aramid fiber.
13. A speaker diaphragm according to claim 12 , wherein the carbon fiber has a filament number of 1,000 to 3,000.
14. A speaker diaphragm according to claim 1 , wherein the thermosetting resin composition comprises an unsaturated polyester resin.
15. A speaker diaphragm according to claim 14 , wherein the base material further comprises an intermediate layer between the core material, and at least one of the first surface material and the second surface material.
16. A speaker diaphragm according to claim 15 , wherein the intermediate layer is formed of one of a woven fabric and a non-woven fabric of one of a high-elastic modulus fiber and a natural fiber.
17. A speaker diaphragm according to claim 1 , which is used for one selected from the group consisting of a speaker frame, an enclosure, and a stand.