Patent ID: 6342963
Filing Date: 2002-01-29
Classification: G02B

Abstract:
An optical scanning apparatus used in an image forming apparatus for scanning a plurality of optical beams on photosensitive members and for synthesizing a plurality of images formed on the photosensitive members to output a synthesized image as a single image,said optical scanning apparatus comprising: a light source for projecting said plurality of optical beams; a deflector for deflecting said optical beams; a first beam sensor for sensing positions of the respective optical beams along an optical beam scanning direction; a second beam sensor for sensing positions of the respective optical beams along a direction intersected with said scanning direction; and a modulation controller for controlling a modulation of each of said plural optical beams projected from said light source based upon the sense results obtained from said first beam sensor and said second beam sensor in such a manner that a positional shift occurred when a plurality of images formed by said respective optical beams are synthesized with each other is suppressed.