Patent ID: 6961164
Filing Date: 2005-11-01
Classification: B41J,G02B

Abstract:
1. Scanning optics comprising: first optics for coupling a light beam issuing from a light source; second optics for condensing the light beam output from said first optics substantially in a form of a line elongated in a main scanning direction; a deflector including reflection faces, which adjoin a position where the light beam is condensed in the form of a line, for deflecting said light beam with said reflection faces; and third optics for condensing the light beam deflected by said deflector toward a surface to be scanned to thereby form a beam spot on said surface for optically scanning said surface; wherein said third optics includes at least one focusing element formed of resin; said second optics includes at least one focusing element formed of resin and at least one focusing element formed of glass, at least one surface of said second optics comprises a non-arcuate auxiliary surface non-arcuate in a section in a subscanning direction, and among said focusing elements of said second optics, a focusing element on which the light beam output from said first optics is transmitted with a maximum diameter in the subscanning direction comprises said at least one non-arcuate auxiliary surface.