Method and disc apparatus for reproducing information signals an

Details Method and disc apparatus for reproducing information signals an Method and disc apparatus for reproducing information signals an

1995-01-05

1996-08-13

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 54, 369124, G11B 700

Patent

active

055463673

ABSTRACT:
An apparatus for reproducing an optical disc in which a light beam radiated from a light source in an optical pickup is radiated to an optical disc and the return light from the disc is detected by a photodetector provided within the optical pickup for reproducing the information signal recorded on the optical disc. A detection output of the return light from the optical disc as detected by the optical pickup is supplied to a waveform equalizer and to a quantity of skew-calculating circuit for detecting the quantity of skew of the optical disc. An output of the waveform equalizer is further supplied to a demodulating circuit. An output of the quantity of skew calculating circuit is inverted in polarity by a polarity inverting circuit and thence supplied to an integrating circuit an output of which is supplied to a control circuit for controlling a correction device for correcting the disc skew. The control circuit for controlling a correction device for correcting the disc skew drives a disc skew correcting circuit provided in the optical pickup in a direction of correcting the tangential skew of the track on the optical disc.

REFERENCES:
patent: 5001690 (1991-03-01), Kamiya et al.

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