Focus and tracking servo decoupling system

Details Focus and tracking servo decoupling system Focus and tracking servo decoupling system

1993-11-05

1994-11-22

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4432, 369 54, G11B 7095

Patent

active

053675134

ABSTRACT:
A circuit for electronically compensating for optical and mechanical instabilities induced into the focus control and tracking control servo circuits of an optical disk apparatus. The circuit contains a filter and a variable gain amplifier for passing a tracking error signal compensation component at a selected frequency within the range of frequencies in which mechanical resonance is significant and at a magnitude equal to the focus error signal component at that frequency. The result is the electronic elimination of optical feedthrough at mechanically resonating frequencies. A calibration circuit establishes the compensation component magnitude for each optical disk inserted into the apparatus.

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IBM Technical Disclosure Bulletin, vol. 28, No. 4, Sep. 1985, pp. 1708-1709 "Calibrating Optical-Disk Tracking Circuits".

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