Optically readable record carrier for recording information, app

Details Optically readable record carrier for recording information, app Optically readable record carrier for recording information, app

1990-03-28

1991-06-11

Levy, Stuart S.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 51, 369 9413, 369 4425, 369 4426, 3692751, G11B 7085, G11B 7950, G11B 724, G11B 726

Patent

active

050238566

ABSTRACT:
An optical disc record carrier having a radiation-sensitive surface and a spiral or concentric pattern of information tracks thereon. The radial displacement of each track is modulated to produce a periodic radial wobble, the frequency of such periodic displacement being modulated by a position-information signal identifying the relative positions of the tracks. During recording or reading of information on the tracks the track modulation is read by a scanning beam. A clock signal for controlling scanning velocity is recovered from the track displacement modulation, and an FM demodulator recovers the position-information signal from the frequency modulation of such displacement.

REFERENCES:
patent: 3963862 (1976-06-01), Bouwhuis
patent: 4067044 (1978-01-01), Maeda et al.
patent: 4238843 (1980-12-01), Carasso et al.
patent: 4363116 (1982-12-01), Kleuters et al.
patent: 4366564 (1982-12-01), de Haan et al.
patent: 4716560 (1987-12-01), Itonaga
"Philips Technical Review", vol. 40, No. 6, 1982, pp. 151 to 179.

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