Patent ID: 6778202
Filing Date: 2004-08-17
Classification: B41J,G02B

Abstract:
An optical scanning device comprising:a light source; forwardly deflecting optical set including a first lens for providing light beams from said light source with a predetermined characteristic, and a second lens for converging said light beams from said first lens in a first direction; a polygonal mirror unit for deflecting the light beams from said forwardly deflecting optical set into a second direction substantially perpendicular to said first direction; a third lens for forming the light beams deflected by said polygonal mirror unit as an image onto a predetermined image surface at substantially equal speed; wherein said second lens includes a resin lens including a surface having a negative power in said first direction, and a glass lens including one convex surface having a positive power in said first direction, said resin lens of said second lens includes a projection which abuts in a direction of said convex surface of said glass lens, and wherein the projection of said resin lens and said glass cylinder lens contact with each other.