| 摘要 |
PROBLEM TO BE SOLVED: To reduce the color slurring in a main scanning direction due to a temperature variation in a light beam scanner provided with a plurality of scanning optical systems, in which light beams are emitted from the respective scanning optical systems. SOLUTION: In the light beam scanner 17 which is provided with two scanning optical systems B and R for black and red, respectively, and emits black and red light beams L1 and L2 from the respective scanning optical systems, optical lenses corresponding to the two scanning optical systems, a black color first fθlens 23B and a red color first fθlens 23R, for example, are formed and composed of different materials, respectively, and the former is made of glass and the latter is made of resin. The corresponding lenses made of different materials have a same figure on both faces, and are composed by providing a same butting standard, piled vertically in two steps, positioned with a common positioning standard, and fixed with a common fixing means. COPYRIGHT: (C)2005,JPO&NCIPI
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