Speaker diaphragm, speaker dust cap, speaker sub-cone, speaker using these components, and electronic apparatus using the same
View Patent ↗A loudspeaker of high sound quality is achieved by improving rigidity of a material used for a diaphragm, a dust cap and a sub-cone. The diaphragm, the dust cap and the sub-cone of the loudspeaker are made of a paper beaten with the material containing bamboo fibers obtained from a bamboo tree aged one year or older, of which the fibers are finely beaten to an extent of micro-fibrillated form. The diaphragm and the dust cap are also made with a beaten paper containing at least 2 wt % of “A fibers” having stems of no greater than 30 μm in diameter, and surfaces of the stems are fibrillated into shaggy branches having diameters of 1 μm or less.
1. A diaphragm for a loudspeaker made of a paper beaten of a material consisting primarily of a plant, wherein:
the beaten paper includes a material obtained from a bamboo tree aged one year or older, of which fibers are finely beaten to an extent of micro-fibrillated form;
wherein the bamboo fibers finely beaten to the extent of micro-fibrillated form have stems of no greater than 30 μm in diameter; and
wherein surfaces of the stems are fibrillated into shaggy branches having diameters of 1 μm or less.
2. A diaphragm for a loudspeaker made of a paper beaten of a material consisting primarily of a plant,
wherein the beaten paper includes:
a material obtained from a bamboo tree aged one year or older, of which fibers are finely beaten to an extent of micro-fibrillated form; and
another material obtained from the bamboo tree aged one year or older, of which fibers are beaten to a degree larger than that of the micro-fibrillated form,
wherein the bamboo fibers finely beaten to the extent of micro-fibrillated form have stems of no greater than 30 μm in diameter; and
wherein surfaces of the stems are fibrillated into shaggy branches having diameters of 1 μm or less.
3. The diaphragm for a loudspeaker as in claim 2 , wherein the beaten paper contains at least 40 wt % of the another material having the fibers beaten to the degree larger than that of the micro-fibrillated form.
4. The diaphragm for a loudspeaker in any of claim 1 or claim 2 , wherein the bamboo fibers finely beaten to the extent of micro-fibrillated form have an average fiber length of at least 10 times an average fiber diameter.
5. The diaphragm for a loudspeaker in any of claim 1 or claim 2 , wherein a content of the bamboo fibers finely beaten to the extent of micro-fibrillated form is between 0.5 wt % and 20 wt %.
6. The diaphragm for a loudspeaker in any of claim 1 or claim 2 further containing a poly-lactic acid.
7. The diaphragm for a loudspeaker in any of claim 1 or claim 2 further containing a crude rubber.
8. The diaphragm for a loudspeaker in any of claim 1 or claim 2 further containing a polyvinyl alcohol.
9. The diaphragm for a loudspeaker in claim 6 containing the poly-lactic acid from 1 wt % to 20 wt %.
10. The diaphragm for a loudspeaker in claim 8 containing the polyvinyl alcohol from 2 wt % to 8 wt %.
11. The diaphragm for a loudspeaker in any of claim 1 or claim 2 containing no coloring agent.
12. The diaphragm for a loudspeaker in any of claim 1 or claim 2 , wherein a lignin content in the bamboo fibers is between 6 wt % and 15 wt %.
13. The diaphragm for a loudspeaker in any of claim 1 or claim 2 containing at least 2 wt % of the bamboo fibers finely beaten to the extent of micro-fibrillated form.
14. The diaphragm for a loudspeaker in claim 13 , wherein at least 50% of the shaggy branches have diameters of 500 nm or less.
15. The diaphragm for a loudspeaker in claim 13 , wherein the shaggy branches occupy at least 20% in volume of the bamboo fibers.
16. The diaphragm for a loudspeaker in claim 13 further containing a poly-lactic acid.
17. The diaphragm for a loudspeaker in claim 13 further containing a crude rubber.
18. A dust cap for a loudspeaker made of a paper beaten of a material consisting primarily of a plant, wherein:
the beaten paper includes a material obtained from a bamboo tree aged one year or older, of which fibers are finely beaten to an extent of micro-fibrillated form;
wherein the bamboo fibers finely beaten to the extent of micro-fibrillated form have stems of no greater than 30 μm in diameter; and
wherein surfaces of the stems are fibrillated into shaggy branches having diameters of 1 μm or less.
19. A dust cap for a loudspeaker made of a paper beaten of a material consisting primarily of a plant,
wherein the beaten paper includes:
a material obtained from a bamboo tree aged one year or older, of which fibers are finely beaten to an extent of micro-fibrillated form; and
another material obtained from the bamboo tree aged one year or older, of which fibers are beaten to a degree larger than that of the micro-fibrillated form,
wherein the bamboo fibers finely beaten to the extent of micro-fibrillated form have stems of no greater than 30 μm in diameter; and
wherein surfaces of the stems are fibrillated into shaggy branches having diameters of 1 μm or less.
20. The dust cap for a loudspeaker as in claim 19 , wherein the beaten paper contains at least 40 wt % of the another material having the fibers beaten to the degree larger than that of the micro-fibrillated form.
21. The dust cap for a loudspeaker in any of claim 18 or claim 19 , wherein the bamboo fibers finely beaten to the extent of micro-fibrillated form have an average fiber length of at least 10 times an average fiber diameter.
22. The dust cap for a loudspeaker in any of claim 18 or claim 19 , wherein a content of the bamboo fibers finely beaten to the extent of micro-fibrillated form is between 0.5 wt % and 20 wt %.
23. The dust cap for a loudspeaker in any of claim 18 or claim 19 further containing a poly-lactic acid.
24. The dust cap for a loudspeaker in any of claim 18 or claim 19 further containing a crude rubber.
25. The dust cap for a loudspeaker in any of claim 18 or claim 19 further containing a polyvinyl alcohol.
26. The dust cap for a loudspeaker in claim 23 containing the poly-lactic acid from 1 wt % to 20 wt %.
27. The dust cap for a loudspeaker in claim 25 containing the polyvinyl alcohol from 2 wt % to 8 wt %.
28. The dust cap for a loudspeaker in any of claim 18 or claim 19 containing no coloring agent.
29. The dust cap for a loudspeaker in any of claim 18 or claim 19 , wherein a lignin content in the bamboo fibers is between 6 wt % and 15 wt %.
30. The dust cap for a loudspeaker in any of claim 18 or claim 19 containing at least 2 wt % of the bamboo fibers finely beaten to the extent of micro-fibrillated form.
31. The dust cap for a loudspeaker in claim 30 , wherein at least 50% of the shaggy branches have diameters of 500 nm or less.
32. The dust cap for a loudspeaker in claim 30 , wherein the shaggy branches occupy at least 20% in volume of the bamboo fibers.
33. A sub-cone for a loudspeaker made of a paper beaten of a material consisting primarily of a plant,
wherein the beaten paper includes a material obtained from a bamboo tree aged one year or older, of which fibers are finely beaten to an extent of micro-fibrillated form,
wherein the bamboo fibers finely beaten to the extent of micro-fibrillated form have stems of no greater than 30 μm in diameter; and
wherein surfaces of the stems are fibrillated into shaggy branches having diameters of 1 μm or less.
34. A sub-cone for a loudspeaker made of a paper beaten of a material consisting primarily of a plant,
wherein the beaten paper includes:
a material obtained from a bamboo tree aged one year or older, of which fibers are finely beaten to an extent of micro-fibrillated form; and
another material obtained from the bamboo tree aged one year or older, of which fibers are beaten to a degree larger than that of the micro-fibrillated form,
wherein the bamboo fibers finely beaten to the extent of micro-fibrillated form have stems of no greater than 30 μm in diameter; and
wherein surfaces of the stems are fibrillated into shaggy branches having diameters of 1 μm or less.
35. The sub-cone for a loudspeaker as in claim 34 , wherein the beaten paper contains at least 40 wt % of the another material having the fibers beaten to the degree larger than that of the micro-fibrillated form.
36. The sub-cone for a loudspeaker in any of claim 33 or claim 34 , wherein the bamboo fibers finely beaten to the extent of micro-fibrillated form have an average fiber length of at least 10 times an average fiber diameter.
37. The sub-cone for a loudspeaker in any of claim 33 or claim 34 , wherein a content of the bamboo fibers finely beaten to the extent of micro-fibrillated form is between 0.5 wt % and 20 wt %.
38. The sub-cone for a loudspeaker in any of claim 33 or claim 34 further containing a poly-lactic acid.
39. The sub-cone for a loudspeaker in any of claim 33 or claim 34 further containing a crude rubber.
40. The sub-cone for a loudspeaker in any of claim 33 or claim 34 further containing a polyvinyl alcohol.
41. The sub-cone for a loudspeaker in claim 38 containing the poly-lactic acid from 1 wt % to 20 wt %.
42. The sub-cone for a loudspeaker in claim 40 containing the polyvinyl alcohol from 2 wt % to 8 wt %.
43. The sub-cone for a loudspeaker in any of claim 33 or claim 34 containing no coloring agent.
44. The sub-cone for a loudspeaker in any of claim 33 or claim 34 , wherein a lignin content in the bamboo fibers is between 6 wt % and 15 wt %.
45. The sub-cone for a loudspeaker in any of claim 33 or claim 34 containing at least 2 wt % of the bamboo fibers finely beaten to the extent of micro-fibrillated form.