Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1989-05-12
1991-05-14
Canney, Vincent P.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4411, 369109, 369111, 3692754, 358342, G11B 709, G11B 724, G11B 713
Patent
active
050162357
ABSTRACT:
The present invention concerns an arrangement for reading an optically readable light reflective carrier on which data is stored in the form of the diffractive data elements which are deviations from a reference surface. The data elements each have a plurality of adjacent tracks located on the carrier with data elements being positioned on adjacent tracks. The system utilizes an illumination means for projecting a concentrated light spot onto the carrier in order to obtain diffraction of light along the entire length of each of the data elements with an optical arrangement collecting light reflected from a carrier in such a way that the light energy which is received when a projected light spot impinges on the reference surfaces greater than the light energy received when the projected light spot impinges on a data element.
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"Thomson-CSF"
Canney Vincent P.
Young W. R.
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