Patent ID: 6072176
Filing Date: 2000-06-06
Classification: B41J,G02B

Abstract:
An image forming apparatus for forming an image on a page, comprising:a laser beam light source which emits a laser beam;an optical element which corrects a convergence position of the laser beam;a driver which moves said optical element to correct said convergence position;a detector disposed at an optically equivalent position to a scanned surface and which detects a convergence condition of the laser beam; anda controller which calculates an amount of positional displacement of the convergence position to correct the beam convergence position based on the detected convergence condition of the laser beam and controls said driver by said displacement amount,wherein said controller executes processing to correct the beam convergence position between an image forming operation of one page and an image forming operation of a next page, and, when the calculated amount of positional displacement exceeds a limit value, said controller controls said driver to move said optical element so as to be within the limit value.