| 摘要 |
A lens tilt adjusting mechanism is configured by a piezoelectric element, a lens holder formed into a ring shape, and a holder fit-in part arranged in a tubular form in the movable part of an actuator. An objective lens is fixed on an inner side of the lens holder, the lens holder is fitted to the inner side of the holder fit-in part and held in the holder fit-in part in a tiltable manner when an outer peripheral surface contacts and slides along an inner peripheral surface of the holder fit-in part; the piezoelectric element is attached on the inner side of the holder fit-in part so that one end in an extending and contracting direction of the piezoelectric element contacts a step surface formed on the inner side of the holder fit-in part and the other end contacts the surface on the side away from an optical recording medium side of the lens holder; and other members are not interposed between the objective lens and the optical recording medium.
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