| 摘要 |
PROBLEM TO BE SOLVED: To provide an adjustment mechanism of an objective lens drive device which can adjust the tilt of the optical axis of the objective lens and the positional deviation of an optical axis relative to a laser beam. SOLUTION: A means to adjust the tilt of the objective lens drive device to parallelize the optical axes of a laser beam and the optical axis of the objective lens 1 is constituted so that an optical housing 8 supports the objective lens drive device pivotably. A projecting part 7a is formed on either side of the pivotal supporting section, and a flat surface part 8a or a V-groove part 8b is formed on the other side. When the projecting part 7a slides on the flat surface part 8a or the V-groove part 8b, the projecting part 7a is relatively moved in one axial direction or two axial directions of either the tracking direction or the tangential direction, thereby the positional deviation of the objective lens drive device is adjusted. The projecting part 7a may be supported by a recessed part 16a provided in a spacer 16, and a spacer 16 may be slid on the flat surface part 8c of either one member.
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