Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-10-19
1992-07-21
Envall, Jr., Roy N.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
358342, 369 4411, 369109, 369111, 3692754, G11B 709
Patent
active
051329522
ABSTRACT:
The present invention concerns an arrangement for reading an optically readable light reflective carrier on which data is stored in the form of diffractive 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 device 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 light energy which is received when a projected light spot impinges on the reference surface is greater than the light energy received when the projected light spot impinges on a data element.
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Envall Jr. Roy N.
Thomson-SA
Young W. R.
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