Optical recording/reproducing apparatus with light beam deflecti

Details Optical recording/reproducing apparatus with light beam deflecti Optical recording/reproducing apparatus with light beam deflecti

1992-05-06

1994-01-11

Sniezer, Andrew L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4438, 369112, G11B 700, G11B 709

Patent

active

052788130

ABSTRACT:
An optical recording/reproducing apparatus includes a plurality of semiconductor lasers, an objective lens for focusing light beams from the semiconductor lasers on an optical disk to form a plurality of light spots, and a correction unit for reducing an offset in a tracking signal occurring concomitantly with relative position correction for the light spots. The correction unit includes a rotary wedge-shaped prism disposed in an optical path through which a laser beam incident on the optical disk and a reflection laser beam from a light spot on the disk pass in opposite directions. The shape, refractive index and initial installation angle of the wedge-shaped prism are designed to have predetermined values that cancel the position shift of the laser beam on the objective lens surface occurring concomitantly with deflection of the laser beam.

REFERENCES:
patent: 4074085 (1978-02-01), Russell
patent: 4700336 (1987-10-01), Yoshida et al.
patent: 5031165 (1991-07-01), Fujita
patent: 5068843 (1991-11-01), Takeshita et al.
patent: 5161243 (1992-11-01), Ishida et al.
Ishida et al., "Two Laser Optical Head and its Application" Optical Memory Symposium '86 pp. 121-126.

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