Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
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.
Kabushiki Kaisha Toshiba
Stephan Steven L.
LandOfFree
Optical data processor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical data processor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical data processor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-627441