Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1992-04-21
1994-12-20
Psitos, Aristotelis
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4441, G11B 700
Patent
active
053751078
ABSTRACT:
A regulation circuit which guides a laser beam along the data track of a recording medium includes a first comparator which receives an HF signal and a first threshold signal. The HF signal is normally high and goes low when the laser scans a dirty or damaged area of the recording medium. The first comparator provides a first output signal when the HF signal is less than the first threshold signal. A second comparator receives a tracking error signal and a second threshold signal. The tracking error signal is normally low and goes high when the laser leaves the data track. The second comparator provides a second output signal when the tracking error signal is high and exceeds the second threshold signal. The first and second output signals are input to an AND gate which provides a signal indicating that the laser beam has left the data track when the first and second output signals are both high.
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Fuldner Friedrich
Gleim Gunter
Rekla Bernd
Deutsche Thomson-Brandt GmbH
Herrmann Eric P.
Hindi Nabil
Kurdyla Ronald H.
Psitos Aristotelis
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