| 摘要 |
<p>PURPOSE:To substantially decrease a gear noise by causing the engagement of a worm with a worm wheel at the maximum speed of gearing for driving a tilting member to change an illumination angle via tilting motion. CONSTITUTION:When a d.c. motor 26 rotates, a worm wheel 47 rotates via a worm 27 and this rotation is transferred to a gear section 43 via the first counter gear 62, thereby causing the rotation of an output gear 41. Consequently, a thread groove 45 feeds the screw 31 of an adjustment shaft support body 28, and an adjustment shaft 37 to move and support the shaft 28 fore and aft according to a rotational direction, is also caused to move fore and aft. The shaft 37 is screwed to a nut body supported on a reflecting mirror and, therefore, can tilt the reflecting mirror for adjusting an illumination angle. The rotation of the output gear 41 is transferred to a detection gear 54 via the second counter gear 63, thereby enabling the position of the adjustment shaft 37 to be detected with a detection section 50.</p> |
