| 摘要 |
PROBLEM TO BE SOLVED: To form a concentrically circular pit pattern with high precision in the manufacturing of a master disk. SOLUTION: An optical path control circuit 26 and an optical path modulator 5 move the converging point of an optical flux, which is converged by the objective lens of an optical head 7, in accordance with a tooth-shaped waveform for the optical head 7, thereby making the locus of the movement concentrically circular for the converging point on a master disk material 101.
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