| 摘要 |
PURPOSE:To cut off an excessive input when its input has been applied by providing a protecting device for cutting off a circuit in accordance with the excessive input on at least one part in a part of an input terminal of a transducer. CONSTITUTION:On an input terminal 5, a terminal plate 5a of roughly a plate which has been formed by an insulating material, and at least three pieces of terminals 6 being electric conductors provided on this terminal plate 5a are provided, and between the respective terminals, an insulating state is held mutually. To the first terminal among these three pieces of terminals, one lead part 2a of a voice coil 2 is connected. To the third terminal 6c, the other lead part 2b of the voice coil 2 is connected. Also, between the second terminal 6b and the third terminal 6c, an electric conductor 7 of a copper wire, etc., is provided, and this electric conductor 7 constitutes an excessive input protecting device 8 which is heated by a current and fused when it exceeds some current value. |
