| 摘要 |
<p>PURPOSE:To minutely adjust a terminal position of operation stroke by screwing an actuator with a female screw provided on a rotor of a motor, and stopping the actuator when the actuator reaches a specified position through its abutment with a point stopper. CONSTITUTION:A specified driving pulse is applied to stator coils 13, 14 of a stepping motor, and a rotor 9 is rotated. Then an actuator 1 screwed with a fremale screw of the rotor 9 is moved vertically in the drawing, and for instance, an optical axis adjustment means of a headlamp interlocked with an end of the actuator 1 is driven. When a bottom 22 of the actuator 1 is in contact with a point stopper 17 of a stopper 16, the actuator 1 is prevented from further descending. The stopper 16 is capable of reciprocably screwing by engaging a driver as a tool with a fitting groove 19 formed on the bottom of the stopper 16. Positioning error of a lowermost position, namely, an initial point of the actuator 1 can be minutely adjusted.</p> |
