Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1987-07-06
1988-09-27
Psitos, Aristotelis M.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369111, 358342, 360 722, G11B 1722, H04N 576
Patent
active
047746998
ABSTRACT:
A method and apparatus for rapidly moving a reading beam of light radially relative to a rotating record disc, to impinge on a selected target track on the disc and recover information recorded on it. The apparatus first radially translates an optical system that directs the beam onto the disc at a relatively high speed until it is within a prescribed radial distance of the target track. Thereafter, an element of the optical system is controllably deflected such that the beam moves incrementally across a prescribed plurality of tracks during each disc revolution, until reaching the target track. The information recorded on each track includes a unique address signal, and movement of the beam relative to the disc is controlled according to the difference between the respective addresses of the track currently being scanned and the target track. If the apparatus fails to properly recover a track address signal, it estimates the address of the track currently being scanned, and updates its control of the beam's radial movement based on that estimate.
REFERENCES:
patent: 4106058 (1978-08-01), Romeas et al.
patent: 4138741 (1979-02-01), Hedlund et al.
patent: 4375091 (1983-02-01), Dakin et al.
patent: 4498158 (1985-02-01), Akiyama
SMPTE Journal, vol. 86, No. 2, Feb. 1977, pp. 80-83.
Patent Abstract of Japan, vol. 6, No. 137 (P-130-(1015), Jul. 24, 1982.
Discovision Associates
Psitos Aristotelis M.
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