| 摘要 |
A light beam cut-off device installed separately from a light beam scanning device and making it possible to cut off a light beam emitted from the light beam scanning device to a photosensitive material when exposure for the photosensitive material is stopped, and prevent transmission of vibration to the light beam scanning device. The light beam cut-off device disposed below the light beam scanning device. An elongated plate shutter member extending along a main scanning direction of a laser beam emitted from the light beam scanning device, is provided so as to, when exposure for the photosensitive material is stopped, swing due to driving force of the stepping motor to a position at which the laser beam is blocked. Further, when the photosensitive material is exposed, the shutter member swings to a position at which it retreats from the optical path of the laser beam.
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