| 摘要 |
Provided is a simple method of adjusting spherical aberration and a focus offset. According to the adjusting method of the present invention, focus offset adjustment and spherical aberration adjustment are performed based on the fact that the dependence of a focus offset on a spherical aberration correction value (SA) is changed between a first evaluation index indicating a track cross signal characteristic and a second evaluation index indicating a reproduction signal characteristic. A spherical aberration correction value (SA) obtained when a first focus offset and a second focus offset which are related to the first evaluation index and the second evaluation index, respectively, become optimum points is used together with a focus offset value associated with the spherical aberration correction value. Therefore, predetermined processing steps are performed to uniquely obtain an optimum spherical aberration correction value (SA) and an optimum focus offset.
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