| 摘要 |
PURPOSE:To reduce manufacturing cost by obtaining a voice current flowing through a moving coil from a stator coil inserted to a magnetic path of a magnetic circuit through electromagnetic induction thereby eliminating the need for the job connecting the moving coil and the input terminal by cotton sheathed wires. CONSTITUTION:A magnetic circuit 2 formed with a ring shaped magnetic air gap 2e penetrated through a DC magnetic flux phi is provided and the stator coil 1 is arranged at a part of the magnetic path of the magnetic circuit 2, the moving coil 5 whose both ends are short-circuited to form a closed circuit is coupled with a diaphragm 4 and held in the magnetic air gap 2e. Since the stator coil 1 and the moving coil 5 are coupled magnetically by the magnetic circuit 2, an induction current is caused to the moving coil 5 by the electromagnetic induction by supplying the voice current to the stator coil 1 and the diaphragm 4 is vibrated by the electromagnetic force generated through the interlink of the induced current and the DC magnetic flux phi. Thus, the titled electroacoustic transducer is obtained, which is operated without connecting the moving coil 5 and the input terminal by means of conductor wires.
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