Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1991-11-19
1993-01-26
Young, Wayne R.
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369109, 369111, 369 4426, G11B 724
Patent
active
051827433
ABSTRACT:
The present invention concerns an arrangement for reading an optically readable light reflective carrier on which data is stored in 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 system for projecting a concentrated light spot onto the carrier along a track wherein the diffraction is such that the light emerging from the diffractive track has a spatial distribution representing an amount of track misregistration between the spot and the axis of the track.
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"Thomson-CSF"
Young Wayne R.
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