OPTICAL DISK DEVICE AND OPTICAL BEAM RADIATION ANGLE ADJUSTING METHOD

摘要

PROBLEM TO BE SOLVED: To appropriately irradiate a tilted optical disk with an optical beam.

SOLUTION: The optical disk device 10 generates radius information MR1 and MR2 based on first address information MA1 showing an address followed by the focus Fr1 of a red optical beam Lr1on on a servo layer 104 and second address information MA2 showing an address followed by the focus Fr2 of a red optical beam Lr2 on a servo layer 105, while an objective lens 6 is focus-controlled and tracking-controlled to focus the read optical beam Lr1 on a target track TG1; and tilts the optical axis XL of the read optical beams Lr1 and Lr2 and a blue optical beam LB1 to be aligned with a normal XG of the servo layer 104 on the target track TG1 by tilting the objective lens 6 according to a tilt angle θG calculated by using the address information and an expression (6).

COPYRIGHT: (C)2009,JPO&INPIT