Optical disk apparatus with fine tracking mechanism
AssigneeFujitsu Limited
InventorsKoichi Tezuka, Hitoshi Komoriya
Life of this patent
Estimating the term…
Abstract
An optical disk apparatus includes an objective lens system for producing a beam spot on an optical disk, a slider movable relative to the optical disk, and a fine tracking mechanism for shifting the beam spot in a radial direction of the optical disk. The objective lens system is composed of a first lens and a second lens. The second lens is held by the slider and disposed closer to the optical disk than the first lens is. The tracking mechanism shifts the second lens in the radial direction of the optical disk for tracking control.
Claims17
An optical disk apparatus comprising:
- an objective lens system for producing a beam spot on an optical disk by converging light from a light source;
- a slider movable relative to the optical disk, the slider including a lens holder;
- and
- a fine tracking mechanism for shifting the beam spot in a radial direction of the optical disk;
- wherein the objective lens system includes a first lens fixed to the lens holder and a second lens which is smaller than the first lens and held by the lens holder via the fine tracking mechanism, the second lens being closer to the optical disk than the first lens is;
- and
- wherein the fine tracking mechanism shifts the second lens, relative to the first lens, in the radial direction of the optical disk.
An optical disk apparatus comprising:
- an objective lens system for producing a beam spot on an optical disk by converging light from a light source;
- a slider movable relative to the optical disk;
- and
- a fine tracking mechanism for shifting the beam spot in a radial direction of the optical disk;
- wherein the objective lens system includes a first lens and a second lens which is smaller than the first lens and held by the slider, the second lens being closer to the optical disk than the first lens is;
- and
- wherein the fine tracking mechanism comprises an electrostatic actuator for shifting the second lens in the radial direction of the optical disk.
An optical disk apparatus comprising:
- an objective lens system for producing a beam spot on an optical disk by converging light from a light source;
- a slider movable relative to the optical disk;
- a transparent layer attached to the slider and facing the optical disk;
- a fine tracking mechanism for shifting the beam spot in a radial direction of the optical disk;
- wherein the objective lens system includes a first lens and a second lens which is smaller than the first lens and held by the slider, the second lens being closer to the optical disk than the first lens is;
- and
- wherein the second lens is held by the slider in a manner such that an air layer intervenes between the second lens and the transparent layer.
Dependencies are inferred from the claim text.