| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the fluctuations in a halftone dot area by removing unnecessary light (reflected and scattered light) exclusive of main exposure light in exposure of a photosensitive planographic printing plate. SOLUTION: A baffle 128 is placed in the minimum required position, by which the fluctuation in the halftone dot area by the reflected and scattered light is suppressed and in addition, the space sufficient for maintenance work of a spinner mirror 116, etc., may be sufficiently assured. The baffle 128 is formed to a sectorial shape and is arranged around the spinner mirror 116, by which the light of the sub-scanning component of the reflected and scattered light may be surely shielded. |
