| 摘要 |
PURPOSE:To facilitate the movement of a light shielding film and to improve the operativity of a composer by allowing a glass plate to move back and forth from an original holder. CONSTITUTION:An original film 40 and a lithographic plate 22 are positioned between a supporting plate 21 for the composer and the glass plate 30 provided to the original holder 23, the inside is evacuated, and an exposure part is shielded by the light shielding film 34 to expose the exposure part to a light source 31. Consequently, the glass plate 30 is provided movably in a forward/ backward direction relative to the original holder 23 through a supporting arm 25 and a gear 28; when the light shielding film 34 is moved, the glass plate 30 is moved back to move the glass plate easily, improving the operativity. |
