| 摘要 |
PROBLEM TO BE SOLVED: To insulate a leader line from a magnetic circuit and to secure a hermetic state in a driver unit in an electric driver unit. SOLUTION: The driver unit consists of a magnetic circuit 1, a packing 2 placed on the magnetic circuit 1 and a diaphragm 3 fixed to the gasket 2. When a voice coil 34 constituting the diaphragm 3 vibrates, the leader line 31 connected to the voice coil 34 also vibrates. However, since an insulating plate 26 connected the packing 2 interposes between the leader line 31 and an iron plate 14 constituting the magnetic circuit 1, they are not brought into electrical contact with each other. Also, since a groove magnification part 25 packed with a flexible member 9 is provided in a groove part provided on the upper surface of the packing 2 in order to pull out the leader line 31 outside, the hermetic state in the driver unit is kept.
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