PICTURE FORMING DEVICE FOR NEGATIVE ORIGINAL AND POSITIVE ORIGINAL

摘要

PURPOSE:To obtain easily and optimumly the copy of the negative original and the positive original by making different the quantity of the irradiating light of the negative original from the quantity of the irradiating light of the positive original. CONSTITUTION:The quantity of irradiating light of the negative original is set larger than that of the positive original by the prescribed quantity of light beforehand, and the quantity of irradiating light is changed over in accordance with the negative original and the positive original. In the original density adjusting volume, the exposure quantity variable width and the maximum quantity of light of the negative original are set for the prescribed quantity larger than the positive original, and the quantity of irradiating light is changed over in accordance with the negative original and the positive original. Namely, by matching the absolute value of the exposure quantity contrast of the negative and the positive of necessary character information, the suitable copy of the standard original is always obtained near the center of the quantity of irradiating light volume 66.