Patent ID: 6137616
Filing Date: 2000-10-24
Classification: G02B

Abstract:
A multi-beam optical scanning device comprising:a light source section capable of emitting a plurality of light beams;a photosensitive member having a cylindrical configuration and rotatable about a center axis; anda deflecting/scanning optical system for condensing said plurality of respective light beams at slightly different positions in the direction of rotation on the surface of said photosensitive member, and deflect said plurality of respective condensed light beams so as to scan the surface of said photosensitive member in a direction perpendicular to the direction of rotation of said photosensitive member;wherein the following equation is satisfied: ##EQU4## Where r represents the radius of the photosensitive member (mm); .alpha. represents the maximum value of the angle obtained by subtracting the angle formed by the light beam and the scanned line on the surface of said photosensitive member from 90 degrees; D represents the distance (mm) on the surface of the photosensitive member between the light beam condensing position on the furthermost upstream side and the condensing position on the furthermost downstream side in the direction of rotation of the photosensitive member.