| 摘要 |
A method of adjusting spherical aberration correction and focus offset of a light beam comprises steps of: detecting a first approximate straight line indicating a first relationship between the spherical aberration correction and the focus offset according to a first evaluation index indicating a quality of cross-track signal; detecting a second approximate straight line indicating a second relationship between the spherical aberration correction and the focus offset according to a second evaluation index indicating a quality of reproduced signal; and determining a spherical aberration correction value and a focus offset value to be adjusted from an intersection of the first approximate straight line and the second approximate straight line.
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