Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1982-09-09
1986-11-11
Psitos, Aristotelis M.
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
369 46, G11B 700, G11B 2110
Patent
active
046226591
ABSTRACT:
Focus detecting apparatus is disclosed which is useful, for example, in an optical storage system for detecting the quality of focusing of a laser beam on the surface of an optical medium. For focus detection purposes, the reflected beam is collected and separated into two beams which are applied to first and second photosensitive elements, respectively. Focus detection is achieved based on determining the difference between the diameters of the beams incident on the photosensitive elements which are located so that the diameters of the beams applied thereto are indicative of the quality of focusing of the beam on the surface.
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Chan Gilbert Y.
Hazel Robert L.
Burroughs Corporation
Cass Nathan
Chung Edmund M.
Peterson Kevin R.
Psitos Aristotelis M.
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