Patent ID: 6141118
Filing Date: 2000-10-31
Classification: B41J,G02B

Abstract:
An optical scanning device comprising:light source means having a plurality of light emission sections;deflection means for deflecting a plurality of light beams emitted by the light source means, wherein said plurality of light beams deflected by said deflection means are non-parallel;optical means for guiding the plurality of light beams emitted by the light source to the deflection means; andimage forming means for guiding the plurality of light beams deflected by the deflection means to a surface being scanned, the image forming means comprising a plurality of rotationally asymmetrical lenses, each of which is associated with a respective one of said plurality of light beams, wherein the optical axis of the plurality of rotationally asymmetrical lenses are substantially parallel with the light beams incident on the respective lenses, and each of the generatrices that connect the vertices of the radius curvature on a lens surface in the sub-scanning direction of the plurality of rotationally asymmetrical lenses is curved in the direction of a sub-scan.