JPS6433541A - Original close-contact type exposure device - Google Patents

Abstract

PURPOSE:To enable an original to be connected closely on a photosensitive sheet plane with a uniform pressing power, by arranging a contact auxiliary member curved to a confronting plane in such a way that it can be moved separately and closely freely on either back plane of the original or the photosensitive sheet plane when either or both of them are arranged with tension. CONSTITUTION:The photosensitive and pressure sensitive sheet 4 is connected closely on the plane of the original 1 according to the descending of a contact auxiliary plate 5. A weak power in a direction to press the original 1 on the plane of the photosensitive and pressure sensitive sheet 4 is generated as the component of a tensile force T due to the copying of an original supporting belt 3 to the curvature of the contact auxiliary plate 5. At this time, since the component in a pressing direction is weak, no pressure sensing of the photosensitive and pressure sensitive sheet 4 is generated, which generates no deterioration in picture quality. Since such weak component is generated extending over entire plane of the original 1, no space is generated between the original 1 and the photosensitive and pressure sensitive sheet 4. Furthermore, since the contact auxiliary plate 5 is formed in a shape to be curved downward, the space between the original 1 is larger advancing to an outside when the photosensitive and pressure sensitive sheet 4 descends, thereby, no mixture of the air is generated between the original 1 and the photosensitive and pressure sensitive sheet 4.