| 摘要 |
PROBLEM TO BE SOLVED: To stably provide a loudspeaker excellent in reproduction sound quality, which has high adhesive strength among a dome diaphragm, a cone diaphragm, and a bobbin of a voice coil constituting a vibration system, and has less peak, dip on sound pressure frequency characteristics. SOLUTION: The loudspeaker 1 includes: the dome diaphragm 5 molded by impregnation of thermosetting resin in a substrate; the cone diaphragm 6 the outer peripheral side edge of which is connected to the outer peripheral edge of the dome diaphragm; and the voice coil 3 in which one end of the bobbin is connected to the rear surface of the dome diaphragm, and an inner peripheral edge of the cone diaphragm is connected to the outer curved surface of the bobbin, wherein the dome diaphragm is molded by curing the thermosetting resin to project on its rear surface side, has a plurality of cone projections which are annularly and separately arranged, the plurality of cone projections specify connection parts to which one end of the bobbin is connected. COPYRIGHT: (C)2009,JPO&INPIT
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