Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1994-05-05
1995-05-02
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369109, 369111, 369120, 369121, 3692753, 3692754, G11B 7095
Patent
active
054126355
ABSTRACT:
An optical disk includes a recording medium having a disk shape, and a plurality of signal pit strings formed on the recording medium and arranged in a circumferential direction of the optical disk. Each of the signal pit strings includes a plurality of signal pits arranged in a line in a radial direction of the optical disk. An optical pickup apparatus includes a photodetector having a plurality of photoelectric elements. A light spot is sequentially projected onto the signal pit strings, and a reflected light therefrom is converged by an objective lens. An image formed by the objective lens is detected by the photodetector located in an image forming position of the objective lens. The unit information pieces contained in one of the signal pit strings are simultaneously read by the photoelectric elements. In this manner, the signal pit strings are sequentially read while the optical disk is being rotated.
REFERENCES:
patent: 3939302 (1976-02-01), Kihara
patent: 4260858 (1981-04-01), Beiser
patent: 4353077 (1982-10-01), Gokey et al.
Pioneer Electronic Corporation
Young W. R.
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