| 摘要 |
<p>A lens holder (14A) is disposed in a corner portion formed by a base plate (122) and a vertical wall (124), and is always pressed against the corner portion by a presser bar spring (16). The lens holder (14A) has an adjustment groove (14Aa) extending in a direction perpendicular to the vertical wall. The adjustment groove (14Aa) has a taper shape with a width that narrows with approach to the vertical wall. By moving an adjustment pin (18a), which pin is inserted into the adjustment groove (14Aa) through a hole (122b) formed in the base plate, the lens holder is moved along an optical axis (OA) of a laser beam, thereby adjusting a position of a beam spread lens (BSL) without a center axis (CA) thereof moving out of the optical axis. <IMAGE> <IMAGE></p> |
