| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a constitution making possible quick fine regulation in simple operation without becoming a large size as a regulating mechanism for performing the light axial regulation of an optical unit and the regulation of a detection area. SOLUTION: A male screw 71 is formed on the outer peripheral face of the light axial regulation body 7 for modifying the light axial direction of a light projection unit provided with a light projection element 65, and a regulation member 9 is locked on the male screw 71. The light axial regulation body 7 is supported by a rotation support member 74 so as to be rotatable around the center shaft O. The rotation support member 74 is rotatable around a rotary shaft 8 extending in the direction orthogonal to the center shaft O. Staged light axial regulation by rotating the light axial regulation body 7 around the rotary shaft 8 while the regulation member 9 gets over the ridge and continuously light axial regulation by moving the light axial regulation body 7 accompanied by rotating the light axial regulation body 7 around the center shaft O while the regulation member 9 is locked on a groove are performed.</p> |
