| 摘要 |
PROBLEM TO BE SOLVED: To stop dust from sticking on a transparent member as to an exposure device which transmits a laser beam through a transparent member to scan and expose photosensitive paper. SOLUTION: An opening 7 having a transparent member 6 for transmitting a laser beam L is formed in an exposure head H and a dust-proof member 8 having a slit S formed to allow the laser beam L to pass is provided detachably outside the transparent member 6 while covering the transparent member 6.
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