Method and apparatus for locating a selected track on a record d

Details Method and apparatus for locating a selected track on a record d Method and apparatus for locating a selected track on a record d

1985-03-25

1987-10-20

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

360 722, 358342, G11B 1722, H04N 576

Patent

active

047018984

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 addres 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: 3956766 (1976-05-01), Hanson et al.
patent: 4106058 (1978-08-01), Romeas et al.
patent: 4166970 (1979-09-01), Cardot et al.
patent: 4199820 (1980-04-01), Ohtake et al.
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, & JP-5,760,541.

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