| 摘要 |
<p>PURPOSE: To improve a device structure so as to enhance functional reliability, and to solve a conventional problem in manufacturing, without causing a damage on a female screw thread mated with a male screw thread of an adjusting screw even when a reflector is not easily movable or is locked for instance. CONSTITUTION: An open threaded shell 135 is formed on one structural part 111, and an elastic U-shaped holding member 140 is detachably fixed to the structural part 111. This U-shaped holding member is engaged with one section 134 of the structural part 111 or a structural member 132 coupled to the structural part by one leg piece 143, and is engaged with the adjusting screw 126 by other leg piece 141, so as to keep a part of the periphery of the adjusting screw brought into contact with the threaded shell 135 by applying a pre-load.</p> |
