| 摘要 |
<P>PROBLEM TO BE SOLVED: To allow the correction of incident positions of a detection light in the radial direction and the tangential direction, which is reflected from an optical disk and made incident on a photodetector. <P>SOLUTION: An optical element 117 is disposed in a detection light path 116 from the optical disk 106 to the photodetector 108, and by displacing this optical element 117 in the biaxial round direction by an incidence correcting means 118, the incident positions of the detection light made incident on the photodetector 108 in the radial direction and the tangential direction are corrected. <P>COPYRIGHT: (C)2003,JPO |
