Dithered center tracking system

Details Dithered center tracking system Dithered center tracking system

1979-08-27

1982-03-30

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

250202, 310335, 350 62, 350355, G11B 700

Patent

active

043228372

ABSTRACT:
A servo control system for maintaining an information detection device, such as a light beam, centered on a moving information track, such as a spiral recording track on a video disc. The system of the invention includes an optical system, a piezoelectric dither element coated with a resistive material, a dither oscillator, circuitry for deriving an intermediate signal indicative of the effect of dither on the detected signal derived from the information track, phase comparison circuitry for deriving a known error signal from a comparison of the dither signal applied to the piezoelectric element and the actual dither modulation of the light beam retrieved from the information track.

REFERENCES:
patent: 3498693 (1970-03-01), Fein
patent: 3583788 (1971-06-01), Lee
patent: 3894792 (1975-07-01), Komatsubara
patent: 3932700 (1976-01-01), Snopko
patent: 3985952 (1976-10-01), Adler
patent: 4044273 (1977-08-01), Konda
patent: 4090779 (1978-05-01), McNaney
patent: 4232201 (1980-11-01), Canino
"The Electro Optic Effect in Uniaxial Crystals of Type XH.sub.2 PO.sub.4 ", by Billings. Journal of Optical Society of America pp. 802-808. vol. 39, No. 10, Oct. 1945.

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