PURPOSE: To obtain a high gradation medium contrast without lowering resolving power, by using a unit picture element composed of a combination of a large picture element and a small picture element, and modulating the density of each of the picture elements.
CONSTITUTION: In a system wherein an electric signal is converted to a light signal or a heat signal to form an image on a recording medium and medium contrast is recorded using the recording head used in an optical printer, a unit picture element composed of a combination consisting of a large picture element 10 and a small picture element 11 is used to modulate the density of each of the picture elements. When a recording head 1 of an liquid crystal array system is taken as an example, metal interconnections 4, 5, 6, 7 are applied to an upper plate 2 and a lower plate 3 and, at the same time, large windows 8 and small windows 9 are provided, for example, at every four per 1mm in a zigzag pattern. A high gradation medium contrast is obtained without lowering resolving power and the lowering in a recording speed is also reduced.
SHIWA SHINICHI
SUGIHARA SHIGEO
