Control system for an optical data recording apparatus

Details Control system for an optical data recording apparatus Control system for an optical data recording apparatus

1982-02-10

1984-12-11

Faber, Alan

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 54, 369 58, 369106, 369111, 369116, 369124, G11B 700, G11B 2736

Patent

active

044882777

ABSTRACT:
A closed loop control system for an optical recording apparatus of the read after write type comprises a comparator for comparing the input data signal with a playback signal derived from the read beam which trails the write beam and is modulated by the data pattern inscribed on the recording medium by the write beam. The error signal generated by the comparator is applied to a controller which varies the modulation of the read beam in dependence on the error signal, for example, by modifying the data signal used to drive the write beam modulator. In this way, the control system compensates for nonuniformities in the recording medium and the like so as to ensure that the pattern inscribed by the write beam accurately represents the data to be stored.

REFERENCES:
patent: 3654624 (1972-04-01), Becker
patent: 4051329 (1977-09-01), Blondet
patent: 4074282 (1978-02-01), Balas
patent: 4114180 (1978-09-01), Kayanuma
patent: 4221960 (1980-09-01), Maeda
patent: 4225873 (1980-09-01), Winslow
patent: 4283785 (1981-08-01), Miyouchi
patent: 4308612 (1981-12-01), Miyauchi
patent: 4380015 (1983-04-01), Ito
"Ten Billion Bits on a Disk" by Bulthuis, IEEE Spectrum, Aug., 1979, pp. 26-33.

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