Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1986-05-27
1988-09-20
Faber, Alan
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
369 44, 369 46, 369110, 369120, 369 13, 250201, 250202, G11B 7095
Patent
active
047730536
ABSTRACT:
An optical system for guiding a read beam and a magneto-optical storage which utilizes a single beam splitter inserted in the beam path of a linearly polarized light beam directed onto a storage disk for splitting the reflected beam into a deflected beam path and onto photo detectors. This optical arrangement includes a polarizer and an astigmatic imaging system. One of the two photo detectors is a four-quadrant detector and the other of the two detectors can be split into two regions with each of these detectors being positioned in one of the two sub-beams. Data signals derived from the intensity differences between the sub-beams and control signals for both a focusing control and for tracking control are derived from the detectors. Preferably, the photo detectors and the integrated circuits are part of an integrated circuit which also includes electrical circuits for the arrangements for obtaining the raw data, the tracking signal and the focusing signal.
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Faber Alan
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