Patent ID: 6201627
Filing Date: 2001-03-13
Classification: G02B

Abstract:
An optical scanning device for scanning a subject with a light beam spot that moves along a straight line on the subject medium, said optical scanning device comprising:a generally rectangular box-shaped housing; anda scanning optical system installed in said generally rectangular box-shaped housing, said scanning optical system including at least a rotary polygon mirror for repeatedly reflecting and deflecting a scanning beam incident thereupon and an f-.theta. lens system for continuously varying movement of the scanning beam spot relative to a regular angle of rotation of the polygon mirror so as to scan over the subject medium at an even scanning speed;wherein said f-.theta. lens system comprises at least first and second lens elements and at least one reflection mirror located between said first and second lens elements so as to form an optical path which is turned at approximately right angle by said reflection mirror and extends along at least two adjacent walls of said generally rectangular box-shaped housing.