Focus servo control system for automatically adjusting a relativ

Details Focus servo control system for automatically adjusting a relativ Focus servo control system for automatically adjusting a relativ

1981-12-22

1984-10-02

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 46, 250201, G11B 708, G11B 712

Patent

active

044751826

ABSTRACT:
A focus servo control system for automatically adjusting a relative distance between an objective lens unit and a recording surface of an optical recording medium in which a laser light beam is converged through an object lens on a recording surface of a recording medium and the laser light is modulated by an optical pattern on the recording surface and reflected therefrom and converted into an electrical signal wherein the focus control system includes a component adapted to be energized by an electrical current to shift the object lens perpendicularly to the recording surface, a component for detecting the laser light reflected from the recording surface for producing an error signal which represents the deviation of the focus of the lens from a desired position with respect to the recording surface, and a servo amplifier adapted to amplify the error signal thereby to produce the electric current for energizing the lens shifting components, and in order to avoid wasteful electrical power consumption and the mechanical noises, the focus control system further includes gain control components for raising the gain of the servo amplifier as the magnitude of the error signal increases.

REFERENCES:
patent: 3974327 (1976-08-01), Van Dijk
patent: 3976828 (1976-08-01), Janssen

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