Optical information reproducing apparatus with improved skew err

Details Optical information reproducing apparatus with improved skew err Optical information reproducing apparatus with improved skew err

1984-12-21

1987-06-16

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

046740783

ABSTRACT:
An optical information reproducing apparatus for reproducing an information recorded on a recording surface of a disc shape record medium is disclosed, which includes an optical pick-up device mounted on a tiltable optical block and having a laser beam source for generating a laser beam and a photo detector for detecting the refelected beam from the recording surface and for reproducing the recorded information, a device for rotating the record medium, a skew error detector for detecting a skew of the record medium relative to the optical pick-up device and for generating a skew error signal having a D.C. component and an A.C. component, a control circuit supplied with the skew error signal and for generating a control signal responsive to the D.C. component of the skew error signal, a skew error corrector controlled by the control signal and for controlling the optical block so that the optical axis of the pick-up device is maintained to be always perpendicular to the recording surface. The above control circuit includes a comparator for comparing the level of the skew error signal with a threshold level and for generating an output pulse, the width of which corresponds to the D.C. component of the skew error signal, and a pulse width discriminator for discriminating the width of the output pulse relative to a reference pulse corresponding to a rotating period of the record medium.

REFERENCES:
patent: 4374324 (1983-02-01), Van Rosmalen et al.
patent: 4502134 (1985-02-01), Kondo et al.
patent: 4589103 (1986-05-01), Tajima

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