Tracking control system for use in an optical reading apparatus

Details Tracking control system for use in an optical reading apparatus Tracking control system for use in an optical reading apparatus

1990-10-01

1991-10-22

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4414, 2502015, G11B 700

Patent

active

050602160

ABSTRACT:
In the tracking control unit of an optical information reading apparatus to perform "Heterodyne Method", electric signals from the respective quadrant-separated subdetectors are inputted to a first adder to obtain a reference sum total signal whose phase is 0.degree.. Regarding phase difference, the sum total signal is compared with a first electric signal from an arbitrary one of the quadrant-separated subdetectors and a second electric signal from the other of the subdetectors located in the diagonal relationship with respect to the arbitrary subdetector, respectively, to produce a first and a second phase compared result signals which are added to each other by a second adder whereby a precise tracking control can be attained irrespective of the existence of any scratch or stain.

REFERENCES:
patent: 4005163 (1991-04-01), Yamamoto et al.
patent: 4410969 (1983-10-01), Maeda
patent: 4467462 (1984-08-01), Shibata
patent: 4525825 (1985-06-01), Ito et al.
patent: 4992652 (1991-02-01), Okada
patent: 4998234 (1991-03-01), Rees et al.
patent: 4998235 (1991-03-01), Ichibashi et al.

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