| 摘要 |
PURPOSE:To obtain an image without halation and to prevent unnecessary line drawing caused by dislocation of timing of recording start by providing a flux breaker on the optical path of laser beams and by causing the flux breaker to be opened by a position detecting means which operates and is interlocked with a rotating polygon mirror only when the flux breaker is in the status to be opened. CONSTITUTION:When the reflection angle of a laser beam L by a face of the rotating polygon mirror 5 comes to the position immediately before a flux detector, a detecting transparent slot 13 passes inside a position detector 15, the position detector 15 outputs a position detection signal S3 and the flux breaker brakes the laser beam L. And when the information of the images C and D is stored in a frame memory, an instruction signal C is input to one of the input terminals of a two-input AND gate 18. On the other hand, the position detection signal S3 from the position detector 15 is input to the two- input AND gate 18 repeatedly in the constant interval through an amplifier 16 and a buffer 17. |
