| 摘要 |
Synchronizing signals for a laser beam scanner are generated by applying first and second angularly spaced light beams 100,200 to the same reflecting surface 11 of a rotary, multi-surfaced mirror 10. When the first reflected light beam 110' is close to the start point 111 of the line 130, the second reflected light beam 210 is focused onto a photo-detector 30 whose output constitutes the synchronizing signal for the scan. Since both input beams 100, 200 are incident on the same mirror surface rather than impinging an edge thereof, jitter due to angle division errors, rotational speed fluctuations, and mechanical vibrations is eliminated.
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