A high efficiency loudspeaker without a damper is provided. The loudspeaker includes magnetic circuit having a magnetic gap and a voice coil member, which has movable coil, disposed in the magnetic gap of the magnetic circuit. The loudspeaker also includes a diaphragm, whose inner peripheral part is linked with the voice coil member, outside the magnetic gap and a frame linked with an outer peripheral part of the diaphragm via a first edge. An inner peripheral part of a suspension holder is linked with the voice coil member at a linked position which is closer to the magnetic circuit than a linked position of the diaphragm and the voice coil member. An outer peripheral part of the suspension holder is linked with a frame via a second edge. The first edge and the second edge are substantially symmetrical with each other about a median of a first edge and a second edge.
1. A loudspeaker comprising:
a magnetic circuit including a magnetic gap;
a voice coil member disposed in said magnetic gap and having a movable coil;
a diaphragm having an inner peripheral part connected to said voice coil member outside said magnetic gap;
a frame;
a first edge having an inner end connected to an outer peripheral part of said diaphragm, and an outer end connected to said frame, such that said first edge interconnects said diaphragm and said frame; and
a suspension holder having an inner peripheral part connected to said voice coil member at a position which is closer to said magnetic circuit than a position at which said inner peripheral part of said diaphragm is connected to said voice coil member,
wherein an outer peripheral part of said suspension holder is connected to said frame via a second edge, with said first edge and said second edge being substantially symmetrical relative to one another about a median of said first edge and said second edge.
2. The loudspeaker according to claim 1 , wherein
said first edge protrudes in a direction away from said magnetic circuit, and said second edge protrudes in a direction toward said magnetic circuit.
3. The loudspeaker according to claim 2 , wherein
an elastic coefficient of said first edge is substantially identical to an elastic coefficient of said second edge.
4. The loudspeaker according to claim 3 , wherein
said first edge and said second edge are made of urethane.
5. The loudspeaker according to claim 4 , wherein
said suspension holder is made of pulp.
6. The loudspeaker according to claim 2 , wherein
said outer peripheral part of said suspension holder is closer to said magnetic circuit than is an inner peripheral part of said frame.
7. The loudspeaker according to claim 2 , further comprising:
a dust-proof net between said suspension holder and said magnetic circuit.
8. The loudspeaker according to claim 2 , wherein
an inner end of said frame is connected to said magnetic circuit, and
an inner end section of said frame includes a vent hole having a dust-proof net.
9. The loudspeaker according to claim 2 , further comprising:
an opening in said suspension holder.
10. The loudspeaker according to claim 2 , further comprising:
an opening in said frame between said first edge and said second edge.
11. The loudspeaker according to claim 2 , further comprising:
a cabinet covering said magnetic circuit on a side thereof that is opposite to a side of said magnetic circuit on which said diaphragm is located, with an elastic coefficient of said second edge being larger than an elastic coefficient of said first edge.
12. The loudspeaker according to claim 1 , wherein
said first edge protrudes in a direction toward said magnetic circuit, and said second edge protrudes in a direction away from said magnetic circuit.
13. The loudspeaker according to claim 12 , wherein
an elastic coefficient of said first edge is substantially identical to an elastic coefficient of said second edge.
14. The loudspeaker according to claim 13 , wherein
said first edge and said second edge are made of urethane.
15. The loudspeaker according to claim 14 , wherein
said suspension holder is made of pulp.
16. The loudspeaker according to claim 12 , wherein
said outer peripheral part of said suspension holder is closer to said magnetic circuit than is an inner peripheral part of said frame.
17. The loudspeaker according to claim 12 , further comprising:
a dust-proof net between said suspension holder and said magnetic circuit.
18. The loudspeaker according to claim 12 , wherein
an inner end of said frame is connected to said magnetic circuit, and
an inner end section of said frame includes a vent hole having a dust-proof net.
19. The loudspeaker according to claim 12 , further comprising:
an opening in said suspension holder.
20. The loudspeaker according to claim 12 , further comprising:
an opening in said frame between said first edge and said second edge.
21. The loudspeaker according to claim 12 , further comprising:
a cabinet covering said magnetic circuit on a side thereof that is opposite to a side of said magnetic circuit on which said diaphragm is located, with an elastic coefficient of said second edge being larger than an elastic coefficient of said first edge.
22. The loudspeaker according to claim 1 , wherein
said voice coil member includes a bobbin, with said bobbin and said suspension holder being made of metal.
23. A loudspeaker comprising:
a magnetic circuit including a magnetic gap;
a voice coil member disposed in said magnetic gap and having a movable coil;
a diaphragm having an inner peripheral part connected to said voice coil member outside said magnetic gap;
a suspension holder having an inner peripheral part connected to said voice coil member at a position which is closer to said magnetic circuit than a position at which said inner peripheral part of said diaphragm is connected to said voice coil member,
a frame connected to an outer peripheral part of said diaphragm via a first edge, and said frame connected to an outer peripheral part of said suspension holder via a second edge,
wherein said first edge and said second edge are substantially symmetrical relative to one another about a median of said first edge and said second edge, and
wherein said diaphragm and said suspension holder are substantially symmetrical relative to one another about a median of said diaphragm and said suspension holder.
24. The loudspeaker according to claim 23 , wherein
said first edge protrudes in a direction away from said magnetic circuit, and said second edge protrudes in a direction toward said magnetic circuit.
25. The loudspeaker according to claim 24 , wherein
an elastic coefficient of said first edge is substantially identical to an elastic coefficient of said second edge.
26. The loudspeaker according to claim 25 , wherein
said first edge and said second edge are made of urethane.
27. The loudspeaker according to claim 26 , wherein
said suspension holder is made of pulp.
28. The loudspeaker according to claim 24 , wherein
said outer peripheral part of said suspension holder is closer to said magnetic circuit than is an inner peripheral part of said frame.
29. The loudspeaker according to claim 24 , further comprising:
a dust-proof net between said suspension holder and said magnetic circuit.
30. The loudspeaker according to claim 24 , wherein
an inner end of said frame is connected to said magnetic circuit, and
an inner end section of said frame includes a vent hole having a dust-proof net.
31. The loudspeaker according to claim 24 , further comprising:
an opening in said suspension holder.
32. The loudspeaker according to claim 24 , further comprising:
an opening in said frame between said first edge and said second edge.
33. The loudspeaker according to claim 24 , further comprising:
a cabinet covering said magnetic circuit on a side thereof that is opposite to a side of said magnetic circuit on which said diaphragm is located, with an elastic coefficient of said second edge being larger than an elastic coefficient of said first edge.
34. The loudspeaker according to claim 23 , wherein
said first edge protrudes in a direction toward said magnetic circuit, and said second edge protrudes in a direction away from said magnetic circuit.
35. The loudspeaker according to claim 34 , wherein
an elastic coefficient of said first edge is substantially identical to an elastic coefficient of said second edge.
36. The loudspeaker according to claim 35 , wherein
said first edge and said second edge are made of urethane.
37. The loudspeaker according to claim 36 , wherein
said suspension holder is made of pulp.
38. The loudspeaker according to claim 34 , wherein
said outer peripheral part of said suspension holder is closer to said magnetic circuit than is an inner peripheral part of said frame.
39. The loudspeaker according to claim 34 , further comprising:
a dust-proof net between said suspension holder and said magnetic circuit.
40. The loudspeaker according to claim 34 , wherein
an inner end of said frame is connected to said magnetic circuit, and
an inner end section of said frame includes a vent hole having a dust-proof net.
41. The loudspeaker according to claim 34 , further comprising:
an opening in said suspension holder.
42. The loudspeaker according to claim 34 , further comprising:
an opening in said frame between said first edge and said second edge.
43. The loudspeaker according to claim 34 , further comprising:
a cabinet covering said magnetic circuit on a side thereof that is opposite to a side of said magnetic circuit on which said diaphragm is located, with an elastic coefficient of said second edge being larger than an elastic coefficient of said first edge.
44. The loudspeaker according to claim 23 , wherein
said voice coil member includes a bobbin, with said bobbin and said suspension holder being made of metal.
45. A loudspeaker comprising:
a magnetic circuit including a magnetic gap;
a voice coil member disposed in said magnetic gap and having a movable coil;
a diaphragm having an inner peripheral part connected to said voice coil member outside said magnetic gap;
a frame;
a first edge having an inner end connected to an outer peripheral part of said diaphragm, and an outer end connected to said frame, such that said first edge interconnects said diaphragm and said frame; and
a suspension holder having an inner peripheral part connected to said voice coil member at a position which is closer to said magnetic circuit than a position at which said inner peripheral part of said diaphragm is connected to said voice coil member,
wherein an outer peripheral part of said suspension holder is connected to said frame via a second edge, with said first edge and said second edge being substantially symmetrical relative to one another about a median of said first edge and said second edge, and
wherein an upper surface of said suspension holder has a corrugated shape.
46. The loudspeaker according to claim 45 , wherein
said first edge protrudes in a direction toward said magnetic circuit, and said second edge protrudes in a direction away from said magnetic circuit.
47. The loudspeaker according to claim 46 , wherein
an elastic coefficient of said first edge is substantially identical to an elastic coefficient of said second edge.
48. The loudspeaker according to claim 47 , wherein
said first edge and said second edge are made of urethane.
49. The loudspeaker according to claim 48 , wherein
said suspension holder is made of pulp.
50. The loudspeaker according to claim 46 , wherein
said outer peripheral part of said suspension holder is closer to said magnetic circuit than is an inner peripheral part of said frame.
51. The loudspeaker according to claim 46 , further comprising:
a dust-proof net between said suspension holder and said magnetic circuit.
52. The loudspeaker according to claim 46 , wherein
an inner end of said frame is connected to said magnetic circuit, and
an inner end section of said frame includes a vent hole having a dust-proof net.
53. The loudspeaker according to claim 46 , further comprising:
an opening in said suspension holder.
54. The loudspeaker according to claim 46 , further comprising:
an opening in said frame between said first edge and said second edge.
55. The loudspeaker according to claim 46 , further comprising:
a cabinet covering said magnetic circuit on a side thereof that is opposite to a side of said magnetic circuit on which said diaphragm is located, with an elastic coefficient of said second edge being larger than an elastic coefficient of said first edge.
56. The loudspeaker according to claim 45 , wherein
said first edge protrudes in a direction away from said magnetic circuit, and said second edge protrudes in a direction toward said magnetic circuit.
57. The loudspeaker according to claim 56 , wherein
an elastic coefficient of said first edge is substantially identical to an elastic coefficient of said second edge.
58. The loudspeaker according to claim 57 , wherein
said first edge and said second edge are made of urethane.
59. The loudspeaker according to claim 58 , wherein
said suspension holder is made of pulp.
60. The loudspeaker according to claim 56 , wherein
said outer peripheral part of said suspension holder is closer to said magnetic circuit than is an inner peripheral part of said frame.
61. The loudspeaker according to claim 56 , further comprising:
a dust-proof net between said suspension holder and said magnetic circuit.
62. The loudspeaker according to claim 56 , wherein
an inner end of said frame is connected to said magnetic circuit, and
an inner end section of said frame includes a vent hole having a dust-proof net.
63. The loudspeaker according to claim 56 , further comprising:
an opening in said suspension holder.
64. The loudspeaker according to claim 56 , further comprising:
an opening in said frame between said first edge and said second edge.
65. The loudspeaker according to claim 56 , further comprising:
a cabinet covering said magnetic circuit on a side thereof that is opposite to a side of said magnetic circuit on which said diaphragm is located, with an elastic coefficient of said second edge being larger than an elastic coefficient of said first edge.
66. The loudspeaker according to claim 45 , wherein
said voice coil member includes a bobbin, with said bobbin and said suspension holder being made of metal.
67. The loudspeaker according to claim 66 , further comprising:
a cabinet covering said magnetic circuit on a side thereof that is opposite to a side of said magnetic circuit on which said diaphragm is located, with an elastic coefficient of said second edge being larger than an elastic coefficient of said first edge.
68. A loudspeaker comprising:
a magnetic circuit including a magnetic gap;
a voice coil member disposed in said magnetic gap and having a movable coil;
a diaphragm having an inner peripheral part connected to said voice coil member outside said magnetic gap;
a suspension holder having an inner peripheral part connected to said voice coil member at a position which is closer to said magnetic circuit than a position at which said inner peripheral part of said diaphragm is connected to said voice coil member,
a frame connected to an outer peripheral part of said diaphragm via a first edge, and said frame connected to an outer peripheral part of said suspension holder via a second edge,
wherein said first edge and said second edge are substantially symmetrical relative to one another about a median of said first edge and said second edge, and
wherein a middle section of said suspension holder is coupled with a middle section of said diaphragm.
69. The loudspeaker according to claim 68 , wherein
said first edge protrudes in a direction toward said magnetic circuit, and said second edge protrudes in a direction away from said magnetic circuit.
70. The loudspeaker according to claim 69 , wherein
an elastic coefficient of said first edge is substantially identical to an elastic coefficient of said second edge.
71. The loudspeaker according to claim 70 , wherein
said first edge and said second edge are made of urethane.
72. The loudspeaker according to claim 71 , wherein
said suspension holder is made of pulp.
73. The loudspeaker according to claim 69 , wherein
said outer peripheral part of said suspension holder is closer to said magnetic circuit than is an inner peripheral part of said frame.
74. The loudspeaker according to claim 69 , further comprising:
a dust-proof net between said suspension holder and said magnetic circuit.
75. The loudspeaker according to claim 69 , wherein
an inner end of said frame is connected to said magnetic circuit, and
an inner end section of said frame includes a vent hole having a dust-proof net.
76. The loudspeaker according to claim 69 , further comprising:
an opening in said suspension holder.
77. The loudspeaker according to claim 69 , further comprising:
an opening in said frame between said first edge and said second edge.
78. The loudspeaker according to claim 69 , further comprising:
a cabinet covering said magnetic circuit on a side thereof that is opposite to a side of said magnetic circuit on which said diaphragm is located, with an elastic coefficient of said second edge being larger than an elastic coefficient of said first edge.
79. The loudspeaker according to claim 68 , wherein
said first edge protrudes in a direction away from said magnetic circuit, and said second edge protrudes in a direction toward said magnetic circuit.
80. The loudspeaker according to claim 79 , wherein
an elastic coefficient of said first edge is substantially identical to an elastic coefficient of said second edge.
81. The loudspeaker according to claim 80 , wherein
said first edge and said second edge are made of urethane.
82. The loudspeaker according to claim 81 , wherein
said suspension holder is made of pulp.
83. The loudspeaker according to claim 79 , wherein
said outer peripheral part of said suspension holder is closer to said magnetic circuit than is an inner peripheral part of said frame.
84. The loudspeaker according to claim 79 , further comprising:
a dust-proof net between said suspension holder and said magnetic circuit.
85. The loudspeaker according to claim 79 , wherein
an inner end of said frame is connected to said magnetic circuit, and
an inner end section of said frame includes a vent hole having a dust-proof net.
86. The loudspeaker according to claim 79 , further comprising:
an opening in said suspension holder.
87. The loudspeaker according to claim 79 , further comprising:
an opening in said frame between said first edge and said second edge.
88. The loudspeaker according to claim 79 , further comprising:
a cabinet covering said magnetic circuit on a side thereof that is opposite to a side of said magnetic circuit on which said diaphragm is located, with an elastic coefficient of said second edge being larger than an elastic coefficient of said first edge.
89. The loudspeaker according to claim 68 , wherein
said voice coil member includes a bobbin, with said bobbin and said suspension holder being made of metal.
90. The loudspeaker according to claim 89 , further comprising:
a cabinet covering said magnetic circuit on a side thereof that is opposite to a side of said magnetic circuit on which said diaphragm is located, with an elastic coefficient of said second edge being larger than an elastic coefficient of said first edge.