Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1991-01-28
1994-03-01
Brier, Jeffery A.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4626, 369109, 369103, 369112, G11B 700
Patent
active
052914712
ABSTRACT:
Apparatus and method for encoding information and recording same as sets of spaced and variably phased marks stored on the optical record wherein the encoded information is read by illuminating each set of such recorded marks with a coherent read light to cause an optical interference pattern consisting of a varying interval and amplitude distribution of lobe maxima separated by amplitude nulls (or minimas) that change in accordance with the encoded information. This read interference pattern is detected by photosensing diode arrays and after decoding, the system outputs an information signal representing the original information. Alternative embodiments store data as variable phase encoded information only in multi-mark sets, and both phase encoded and spatial encoded data in single, variable width, variable phased marks along a record track.
REFERENCES:
patent: 4455652 (1984-06-01), Braat
patent: 5003526 (1991-03-01), Bailey
patent: 5056080 (1991-10-01), Russell
Brier Jeffery A.
Chevalier Robert
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