| 摘要 |
PROBLEM TO BE SOLVED: To use a common carriage (base) when a plate-shaped optical element is used and when a cube-shaped optical element is used. SOLUTION: When a first holding member 31 is set to a fixing part 12A in the case of a beam splitter 21, an optical axis L4 of a passing light Le can be agreed with a principal axis 33a of a first collective lens 33. In the case of a half mirror 22 (22a, 22b), a second holding member 32 is set to the fixing part 12A, whereby an optical axis L5 of a passing light Le' can be agreed with a principal axis 34a of a second collective lens 34. Therefore, any of the optical elements 21 and 22 can be met by selecting and setting the first or second holding member 31 or 32 to the fixing part 12A, and a carriage of the optical pickup can be shared. |
