Information recording/reproducing apparatus for optical informat

Details Information recording/reproducing apparatus for optical informat Information recording/reproducing apparatus for optical informat

1995-06-07

1996-12-03

Young, W. R.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 4428, 369 4429, G11B 700

Patent

active

055815278

ABSTRACT:
Information is recorded and reproduced by making a light beam traverse guide tracks to reach a target track. In moving the light beam to the target track, a tracking error signal is supplied to the inverting input terminal of a comparator to compare it with a potential at the non-inverting input terminal. The comparator outputs a comparison result signal to an output terminal. This output signal is fed back to the non-inverting input terminal via a feedback element so that the potential at the non-inverting input terminal changes with the output signal of the comparator. With the operation of the potential control circuit, a large feedback signal of the feedback element is used when a tracking control off signal is supplied, so that the potential at the non-inverting input terminal is easy to change with the output signal level. When the tracking control off signal is not supplied, a small feedback signal is used to change the potential at the non-inverting input terminal with the output signal level. The signal detected by the comparator is supplied to the output circuit to reference the direction control signal and generate a track traverse detecting signal.

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