| 摘要 |
<p>A local gap (GA) is provided between connection surfaces, that is, the front surface (24e) of a spacer (24) and the back surface (21f) of the core part (21), which are disposed between a core part (21) and a support member (22), thereby making it possible to elastically distort and deform the core part (21) using the gap (GA) provided between the core part (21) and the support member (22) and adjust the amount of distortion of the core part (21) using a fastening state by a fixing member (23). At this time, since the core part (21) is rarely distorted in the direction perpendicular to the direction in which the core part is distorted and deformed, the directions and amounts of astigmatism of an optical surface formation surface (56a) that is an optical surface transfer surface, and the like can be fine adjusted. In other words, the directions and amounts of astigmatism of the optical surface formation surface (56a) that is the optical surface transfer surface, and the like can be adjusted after the fact without producing the core part (21) again.</p> |
