Optical head position control device

Details Optical head position control device Optical head position control device

1984-07-27

1987-02-03

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120

Patent

active

046410201

ABSTRACT:
Disclosed is an improvement in an optical head-position control device in which focusing and tracking of an objective lens are effected by controlling a focus actuator and a tracking actuator on the basis of a detection signal of a light reception element which receives a laser beam reflected by an optical recording medium, the improvement being such that a sensor is provided for detecting the position of the objective lens and a negative feedback signal is superimposed onto a servo signal for the focus actuator and the tracking actuator on the basis of the detection signal from the objective lens detecting sensor to thereby improve the operation margin for the focus actuator and the tracking actuator.

REFERENCES:
patent: 3974327 (1976-08-01), Van Dijk
patent: 4032776 (1977-06-01), Van Rosmalen
patent: 4504938 (1985-03-01), Tajima
patent: 4546460 (1985-10-01), Ando

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