| 摘要 |
PROBLEM TO BE SOLVED: To project a plurality of projection marks with one floodlight. SOLUTION: A light source 14 made of a laser diode is arranged at the rear section in a tube body 12, and a cylindrical lens 13 is rotatably arranged at the front section in the tube body 12. A rotation driving means 15 made of a solenoid for reciprocating and rotating the lens 13 is provided. When the lens 13 is rotated by the prescribed angle and displaced into a plurality of attitudes by the rotation driving means 15, the light beam G emitted from the light source 14 is applied through the lens 13 in various attitudes to form a plurality of projection marks.
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