Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-01-07
1998-04-14
Dinh, Tan
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369103, G11B 700
Patent
active
057401489
ABSTRACT:
An optical data storage system for use with a stationary data storage medium includes a stationary optical head for steering an incident laser beam holographically and/or by means of an acousto-optical method along the X and Y direction across the data storage medium. The incident laser beam is selectively reflected by the data storage medium to indicate the type of data bits recorded on the storage medium. In a preferred embodiment the optical head includes a laser source for emiting a collimated laser beam, a beam steering element for steering the laser beam; a beam splitter for deflecting the reflected laser beam; and a photo-detector for detecting the relative intensity of the reflected laser beam for determining the type of recorded data bits. In one embodiment the beam splitting element includes an elasto-optical crystal that causes the impinging laser beam to be deflected in the X and Y directions. In another embodiment the beam splitting element includes a photo-refractive crystal that causes the laser beam to deflect in the X-Y plane by means of holographic techniques.
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Dinh Tan
Kassatly Samuel A.
King Robert
Read-Rite Corporation
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