| 摘要 |
PURPOSE:To enable an electrically actuated mirror to be returned to an arbitrary memorized attitude with a simple operation, by counting, with the use of a counter, a shift in the attitude of the mirror, and by reversely counting the value on the counter down to its initial value in order to return the mirror. CONSTITUTION:When the contacts 17a, 17b of a switch 17 with respect to a counter 12 are electrically connected together, the counter 12 is reset by means of the output of a fourth NAND logic element 19. Therefore, the counter 12 memorizes the attitude of a mirror upon the switch 17 being turned on, as a zero initial count value, and thereafter, counts the rotational number of a motor 5 which has been required to the control of the attitude of the mirror. When terminals 8a, 8b in a switch are electrically disconnected from each other, the mirror may be returned to its memorized attitude at once. Since the control is carried out by detecting the rotational number of the motor 5, the accurate returning may be made with no affection of voltage variations in a battery 7. |
