Optical disk device
OwnerKenya Kurokawainventor
Life of this patent
Estimating the term…
Abstract
A focus control circuit controls focus of a laser light by using an objective lens actuator. A tracking control circuit controls tracking of the laser light by using the objective lens actuator. The lens actuator includes a fixed unit including two magnets; and a moving unit arranged between the two magnets and including the objective lens, a lens holder, a focus coil, and a tracking coil. The tracking coil is provided on the lens holder such that the position of a tracking coil center in a focus direction is located more toward the objective lens side than the position of a magnetic circuit center of each magnet in the focus direction.
Claims10
An optical disk device comprising:
- an objective lens actuator which drives an objective lens in a focus direction and a tracking direction, the objective lens converging a laser light onto an information recording surface of an optical disk;
- a focus control unit which controls focus of the laser light by using the objective lens actuator;
- and
- a tracking control unit which controls tracking of the laser light by using the objective lens actuator,
- wherein the objective lens actuator comprises:
- a fixed unit including two magnets;
- and
- a moving unit arranged between the two magnets and including the objective lens, a lens holder, a focus coil, and a tracking coil, and
- the tracking coil is provided on the lens holder such that a position of a center of the tracking coil in the focus direction is located more toward a side of the objective lens than a position of a center of a magnetic circuit of the magnets in the focus direction.
An optical disk device comprising:
- an objective lens actuator which drives an objective lens in a focus direction, a tracking direction, and a radial tilt direction, the objective lens converging a laser light onto an information recording surface of an optical disk;
- a focus control unit which controls focus of the laser light by using the objective lens actuator;
- a tracking control unit which controls tracking of the laser light by using the objective lens actuator;
- and
- a radial tilt control unit which controls a radial tilt of the laser light by using the objective lens actuator,
- wherein the objective lens actuator comprises:
- a fixed unit including two magnets;
- and
- a moving unit arranged between the two magnets and including the objective lens, a lens holder, a focus coil, a tracking coil, and a radial tilt coil, and
- the objective lens is provided on an upper side of the moving unit in the focus direction, and the tilt coil is provided only on a lower side of the moving unit than a position of a center of a magnetic circuit of the magnets in the focus direction.
An optical disk device comprising:
- an objective lens actuator which drives an objective lens in a focus direction and a tracking direction, the objective lens converging a laser light onto an information recording surface of an optical disk;
- a focus control unit which controls focus of the laser light by using the objective lens actuator;
- and
- a tracking control unit which controls tracking of the laser light by using the objective lens actuator,
- wherein the objective lens actuator comprises:
- a fixed unit including two magnets;
- and
- a moving unit arranged between the two magnets and including the objective lens, a lens holder, a focus coil, and a tracking coil, and
- a wall thickness of a wall of the lens holder near a mounting portion of the objective lens is thicker than wall thicknesses of other walls of the lens holder.
Dependencies are inferred from the claim text.