| 摘要 |
PROBLEM TO BE SOLVED: To securely protect an image recording carrier against scattered rays, disturbing light, etc., by simple and compact constitution. SOLUTION: The shutter structure 130 is equipped with a shutter member 134 which linearly move forward and backward through a motor 132, a guide shaft 136 which extends in the moving direction of the shutter member 134, and slide bearings 138a and 138b which are arranged on the guide shaft 136 so that they can move forward and backward. The shutter member 134 is provided with groove parts 162a and 162b into which flange parts 148a and 148b of the slide bearings 138a and 138b are inserted movably at right angles to the moving direction of the shutter member 134.
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