Dithered focusing systems

Details Dithered focusing systems Dithered focusing systems

1982-01-15

1984-04-24

Faber, Alan

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

250201, G11B 700

Patent

active

044452098

ABSTRACT:
A servo control system for maintaining an information detection device, such as a light beam, at the optimum focused position above an information track for retrieving the maximum amount of reflected radiation from an information track, such as a spiral recording track on a videodisc. The system of the invention includes an optical system, a piezoelectric dither element, a dither oscillator, circuitry for deriving an intermediate signal indicative of the effect of the dither on the detected signal derived from the information track, phase comparison circuitry for deriving an error signal from a comparison of the dither signal applied to the piezoelectric dither element and the actual dither modulation of the light beam retrieved from the information track, and a movable lens assembly responsive to the error signal for accurately focusing the light beam upon an information track.

REFERENCES:
patent: 3168659 (1965-02-01), Bayre
patent: 3876875 (1975-04-01), Velzel
patent: 3932700 (1976-01-01), Snopko
patent: 3952191 (1976-04-01), Linet
patent: 3985952 (1976-10-01), Adler
patent: 4032776 (1977-06-01), Rosmalen
patent: 4037929 (1977-07-01), Bricot
patent: 4044273 (1977-08-01), Hands
patent: 4124273 (1978-11-01), Huignard

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