| 摘要 |
PROBLEM TO BE SOLVED: To propose a cone type loudspeaker that can reproduce an ultrahigh sound frequency band up to, e.g. 70 kHz. SOLUTION: A voice coil bobbin 11 is fitted to an inner circumference of a cone type diaphragm, a voice coil 12 is mounted on the voice coil bobbin 11 and the voice coil 12 is inserted to a magnetic air gap in this loudspeaker. The voice coil bobbin 11 is made of a conductive material and a gap 11a extended in the lengthwise direction of the voice coil bobbin 11 is provided in the voice coil bobbin 11 to form a 1-turn voice coil, the voice coil 12 is fixed to the voice coil bobbin 11 with a soft adhesive and a high frequency signal is applied to the 1-turn voice coil of the voice coil bobbin 11.
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