Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1992-12-28
1994-06-14
Dzierzynski, Paul M.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4423, 369 59, 369 95, 369122, G11B 714, G11B 7125, G11B 700
Patent
active
053216830
ABSTRACT:
Method and apparatus for reading digital data stored on an optical tape are achieved with a digital optical tape read system including an optical tape and an illumination arrangement. The optical tape has bit cells which are stored along a plurality of tracks of bit cells. Each track includes a line of bit cells, and each bit cell has either a first spot power reflectance representative of a first binary value, or a second spot power reflectance representative of a second binary value. The illumination arrangement functions to illuminate a predetermined area of the optical tape covering a plurality of bit cells with incident light that provides substantially a 180.degree. phase difference between adjacent bit cell locations on the optical tape to be concurrently read. The method of illuminating and reading data stored on an optical tape comprises a first step of generating a collimated coherent light beam which is directed at the optical tape, and a second step of imaging the coherent light beam into a predetermined area of the optical tape covering a plurality of bit cells with light that provides substantially a 180.degree. phase difference between adjacent bit cell locations on the optical tape to be concurrently read.
REFERENCES:
patent: 4519054 (1985-05-01), Jewer
patent: 4567585 (1986-01-01), Gelbart
patent: 4633455 (1986-12-01), Hudson
patent: 4661941 (1987-04-01), Bell et al.
patent: 4807213 (1989-02-01), Chung et al.
patent: 4870633 (1989-09-01), Matsushita et al.
patent: 4939715 (1990-07-01), Vogelgesang et al.
patent: 5081617 (1992-01-01), Gelbart
patent: 5097457 (1992-03-01), Keens et al.
patent: 5120136 (1992-06-01), Oakley
A. B. Marchant, "Optical Recording-A Technical Overview", Addison-Wesley Publishing Co., 1990, Chapter 6, pp. 60-62.
J. W. Goodman, "Introduction of Fourier Optics", McGraw-Hill, 1968, pp. 120-131.
Bruce David V.
Dzierzynski Paul M.
Eastman Kodak Company
Holloway William W.
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