MEASURING APPARATUS FOR RATIO OF PATTERNED AREA

摘要

PURPOSE:To measure the ratio of the patterned area of a printing plate without adverse influences by unevenness, dirtiness, surface treatment of said printing plate by providing a means for operating the ratio of said patterned area of said printing plate on the basis of the detecting values of a plurality of color sensors. CONSTITUTION:Each intensity of a blue light, a red light and a green light included in the reflecting light from a detecting area is detected by a plurality of color sensors A1-An. The ratio of the patterned area of a printing plate can be operated by an operating means 7 based on the detected values of the intensity without being adversely influenced by the unevenness, stains or surface treatment of the printing plate.