| 摘要 |
<p>PURPOSE:To provide an operation of varying the irradiation direction with simple circuit constitution by generating pulse signals having different phases corresponding to the rotational direction of a rotor interlocked with a steering wheel to vary the irradiation direction of a light-projecting means on the basis of these signals. CONSTITUTION:When a steering wheel is turned right, a rotary disk 1 is rotated and pulse-type electric signals A and pulse-type electric signals B having phases delayed 90 deg. later than said signals A are supplied to the input of a processing circuit 3. Both signals A, B generated are subject to non-reversal and reversal amplification respectively by non-reversal amplifiers 31, 33 and reversal amplifiers 32, 34. Coils L1-L4 of a stepping motor 4 are sequentially driven on the basis of both signals to rotate an output shaft 4a clockwise. By the rotation of a subreflector 5b along with said rotation of said shaft 4a is changed right the irradiation direction of a head lamp 5. Thus, the irradiation direction can be changed without using any complicate feedback control system.</p> |
