| 摘要 |
In order to carry out optimization adjustment of a distance between a first lens and a second lens and optimization adjustment of focus offset of two group object lenses in a short period of time, after focusing is operated, while the distance between the first lens and the second lens of the two group object lenses is being adjusted by a first electromagnetic actuator, the two group object lenses are integrally moved by a second electromagnetic actuator, an amplitude variation caused by spherical aberration and an amplitude variation caused by focus servo error which are produced in an RF signal S2 are separated by an envelope detection unit A33 and an envelope detection unit B34 and the two adjustments are carried out simultaneously.
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