Optical data processor

Details Optical data processor Optical data processor

1987-12-24

1990-05-15

Stephan, Steven L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369124, G11B 700

Patent

active

049264079

ABSTRACT:
Two detect signals for correcting a detracking, which is derived from a first photo sensor are supplied to a differential amplifier and an adder, through amplifiers. The amplifiers amplify the supplied detect signals at a first amplification degree in the reproduction mode to reproduce the information from an optical disc. In the record mode, a second amplification degree is used, which is 1/A in the reproduction mode, when the average level of each detect signal is A times that in the reproduction mode. The difference signal between the detect signal from the differential amplifier and the sum signal of them from the adder are supplied to a normalizer. The normalizer divides the difference signal by the sum signal. An objective is moved by the output signal from the normalizer, to correct the detracking. A defocus is corrected, in the same manner as the detracking correction, by using two detect signals for correcting the defocus from a second photo sensor.

REFERENCES:
patent: 4654515 (1987-03-01), Ando
patent: 4663750 (1987-05-01), Hamanaka et al.
English translation of German Patent Office Action dated 6/14/88.

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