Tracking device to effect tracking pull-in in an optical recordi

Details Tracking device to effect tracking pull-in in an optical recordi Tracking device to effect tracking pull-in in an optical recordi

1991-03-04

1992-11-10

Young, Wayne R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

235454, 369 4428, 369 54, G11B 709

Patent

active

051630346

ABSTRACT:
A tracking device usable in an optical information recording and reproducing apparatus for an optical information record medium on which a plurality of tracks are arranged substantially parallel in a first direction. The device includes a light source, a first optical system for forming a small spot on the record medium by converging a light beam from the light source, a second optical system for obtaining the light beam from the record medium, a detecting device for receiving the light beam obtained by the second optical system to output a tracking signal, a vibrating device for vibrating the spot relative to the record medium in a second direction intersecting the first direction, a control device for effecting tracking control with respect to a track, and a selecting device for selectively actuating the vibrating device and the control device in accordance with the tracking signal from the detecting device.

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