| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately detect the quantity of inclination of a movable part with respect to an optical disk surface by only one set of detection means for the quantity of inclination. <P>SOLUTION: A 2nd light source and a 2nd photodetector are provided on a detection unit 42 of a fixed part 10, meanwhile a reflection member 41 is disposed on the movable part 7 by obliquely inclining it with respect to an optical disk surface, and by irradiating the optical disk surface with light from the 2nd light source through the reflection member 41 and receiving this reflected light by the 2nd photodetector again through the reflection member 41, the quantity of inclination of the movable part 7 with respect to the optical disk surface is detected. <P>COPYRIGHT: (C)2004,JPO |
