| 摘要 |
PROBLEM TO BE SOLVED: To provide a diaphragm for loudspeaker that can smoothly pass air when a low-band sound pressure occurs and has a small size and a thin thickness, and to provide a loudspeaker using the diaphragm. SOLUTION: The loudspeaker 1 provided with the diaphragm 10 for loudspeaker integrally formed with the loudspeaker 1 is provided with a voice coil 12 in a case 13. The cone section 101 of the diaphragm 10 is formed in a projecting state on the side of a pole piece 15 and the edge section 102 of the diaphragm 10 is formed in a projecting state on the side opposite to the pole piece 15. When the low-band sound pressure occurs, the air existing in the space 104 between the cone section 101 and pole piece 15 is discharged from a vent 111 after passing through a sufficiently wide space 105 and flowing along the flowing route shown by the arrow 121. Therefore, the load resistance applied to the cone section 101 due to the compression of an air layer disappears. The loudspeaker 1 has such a frequency characteristic that loudspeaker 1 can obtain a high-band sound pressure in a low frequency region (of 300 Hz or its vicinity).
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