| 摘要 |
A laser beam scanning optical system composed of a relatively small number of lenses achieves proper correction of lateral chromatic aberration and offers superior optical characteristics. In this scanning optical system, the scanning lens system is composed of lenses made of optical materials that are so combined as to make the entire lens system achromatic. Further, the scanning lens system receives converging, not parallel, laser beams, so that it only needs to have a relatively weak power.
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