| 摘要 |
<p>PURPOSE:To make it possible to return a movable reflector to a neutral position by simple manipulation even though a drive section fails, by providing an isolating means for cutting off a transmission path between the drive source and an output section and a manipulating means for moving the output section in such a condition that the transmission path is cut off. CONSTITUTION:A gear 41 journalled to a support shaft 31 is meshed with a pinion 32 of a drive motor 32 so that the rotation of the motor 32 is transmitted to an output gear 38 through speed reduction gears 41b, 42a, 42b, 43a, 43b so that a movable reflector 12 is rotated by the output gear 48 through a rotary arm 58. A gear composed of the gears 43a, 43b is slidable on the support shaft 31, and is urged always upward by means of a spring 44. Upon isolation, a knob 55 on a manipulating element 47 to which a gear 50 having the same shape as that of the gear 43b and having an insertion hole for the support shaft 31 is secured is pressed downward so as to release the meshing between the gears 43b and 38, overcoming the spring 44. Accordingly, the gear 50 is meshed, and a movable reflector may be returned to a neutral position by manipulating the knob 55.</p> |
