Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
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.
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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.
Inoue Masayuki
Miura Michio
Ohnishi Kunikazu
Saito Akira
Sasaki Tohru
Hitachi , Ltd.
Sniezer Andrew L.
Tran Thang V.
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