| 摘要 |
A shade driving unit 24 provided in a vehicle headlamp is a solenoid for displacing a movable iron core 36 that pivots a movable shade to a high beam or a low beam position. An inverted diode parallel to the coil is connected to a solenoid driving circuit. A current is kept flowing through the coil by the induced electromotive force generated across the coil after the supply of power to the coil is cut off to gradually de-excite the movable iron core 36. Thus, the movable shade 22 is prevented from strongly butting against a positioning projected portion 26b.
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