| 摘要 |
PROBLEM TO BE SOLVED: To provide an initializing device capable of suitably changing, in accordance with an initializing condition, the shape of a laser beam image which is radiated onto the recording surface of a phase transition type optical disk. SOLUTION: An optical device which is used in the initializing device for the phase transition type optical disk includes: an optical system which has mirror surface parts 26a and 26b consisting of a reflecting material oppositely arranged across the optical axis of the optical device in order to reflect a plurality of times an incident laser beam which crystallizes the recording layer of the optical disk 20 to initialize the recording layer; and a rotating means which rotates the mirror surface parts 26a and 26b around the axis parallel to the optical axis. The mirror surface parts 26a and 26b are arranged around the optical axis at a prescribed tile of θ. |
