PRINTING CONTROLLER

PURPOSE:To prevent a data omission and to obtain a printing result having a high quality by providing an optical latent image generating means by a light emission array, an array driving start chance generating means and a misalignment correcting means of an optical latent image. CONSTITUTION:LED arrays 481, 482 of each different dot density are placed at an angle theta on a concentric circle of a photosensitive drum 40 and an optical latent image is formed by lens arrays 491, 492. A control circuit 41 receives information through an interface 42, and when a dot development of picture element information of a 1-page portion is ended by a circuit 43, a driving control circuit 451 of the array 481 is started, and a call pulse CK00 and an array driving pulse CK01 of a page memory 441 are generated. By the pulse CK00, the information is inputted to a buffer 471 and a lighting control signal is formed, and by the pulse CK01, the array 481 is made enable and an optical latent image is formed on the drum 40. The control circuit 41 starts the circuit 451, and thereafter, starts a driving control circuit 452 of the array 482 after a latent image position correction time (t). By counting the pulse CK00 or CK01, (t) is obtained, and in case of a 300dpiLED array, 300rtheta pieces of pulses are detected, a start chance of the circuit 452 is obtained, and a correction of a high quality can be executed.