| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical pickup where positional information of a collimate lens is obtained in real time. <P>SOLUTION: By detecting the parallelism of a collimator lens outgoing luminous flux 20 with a photo detector 6 for positional detection of the collimator lens, information of a gap between the collimator lens 2 and a light source 1 can be acquired in real time. <P>COPYRIGHT: (C)2007,JPO&INPIT |
