JPS6435530A - Image forming device - Google Patents

Abstract

PURPOSE:To form medium contrast photographic paper by exposing the same position of a photosensitive body plural times by a liquid crystal-optical shutter part and varying the aperture time of the liquid crystal-optical shutter apart with each row. CONSTITUTION:The windows of picture elements A-D on the shutter 31 are imaged on the imaging places A'-D' of the photosensitive body 32 by a lens array 33 for unmagnification inversion. Scanning is then repeated to form another images on the shutter and the photosensitive is moved by one line simultaneously therewith. The shutter windows of the picture elements B-D are imaged in the positions of the imaging places A'-C' respectively on the photosensitive body and while the imaging place D' comes to the outside of the imaging range, the imaging place Z' is newly brought to the position where the transmitted light from the shutter window of the picture element A is received. One point on the photosensitive body receives the transmitted light in order of the picture elements A B C D by repeating this operation. The entire exposing process is ended by 4 times of the scanning periods. Namely, the signal of open is applied by the picture element A, close by the picture element B, open by the picture element C, and open by the picture element D in the case of executing exposing of, for example, 11/15 gradation degree.