| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide freedom for setting the focal distance of a collimator lens. <P>SOLUTION: A collimator lens system is provided with a first lens group moved in a laser optical axis direction to correct a spherical aberration and a fixed second lens group. Thus, even when the focal distance of the synthesis of the collimator lens system is set to a certain value, for example, the focal distance of the first lens group is set somewhat freely by the setting of the focal distance of the second lens group. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
