| 摘要 |
PROBLEM TO BE SOLVED: To provide a projector for a laser beam which is arranged so that the width of the laser beam may be fixed regardless of the distance, by compensating the width of the laser beam, according to the distance to the goal. SOLUTION: A laser beam emitter 3 which outputs a laser beam, and a lens 1 which is arranged ahead of this and condenses the laser beam outputted from the laser emitter 3 toward the goal, are provided in a lens holder 2, and a light emitter holder 4 can reciprocate in the direction of an optical axis. The laser emitter 3 is attached to the light emitter holder 4, and the emitter holder 4 and the laser emitter advances and retreats according to the direction of the rotation of a servo motor 6. The laser emitter 3 is set in the optimum position geared to the distance to the goal. As a result, the width of the laser beam gets in the stipulated range regardless of the distance to the goal. |
