| 摘要 |
PROBLEM TO BE SOLVED: To improve efficiency of a light source in a laser scanning optical device of a multi-beam type. SOLUTION: A semiconductor laser is arranged so that its active layer may be inclined byθdeg. from a sub-scanning direction Y orthogonal with a main scanning direction X. The value ofθ, which is decided in the range of 0 deg.<θ<=90 deg., is desirably an angle minimizing the width Lx of the main scanning direction of elliptically divergent laser beams, that is 90 deg..
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