Telegraphy – Systems – Simplex-reversing periodic
Patent
1975-05-09
1976-06-22
Richardson, Robert L.
Telegraphy
Systems
Simplex-reversing periodic
315169TV, 340324R, 340337, 340174TF, 340174YC, 350151, H04N 566
Patent
active
039652998
ABSTRACT:
A dynamic pattern display and optical data processing system is provided including magnetic bubble devices which may be operated in real-time to produce two and three dimensional patterns such as holograms, kinoform lenses and complex filters. Th display pattern is obtained by directing a linearly polarized light beam through a combination including a one-quarter waveplate, a plurality of two-dimensional magnetic bubble arrays and another one-quarter wave plate, all combined in a stack arrangement. In one embodiment a combination is provided which functions as a phase filter and in another embodiment including more bubble arrays, the combination functions as a phase and intensity filter. The display patterns are multi-phase or multi-tone (gray scale) and multi-phase in character. Each magnetic bubble array in the phase and phase and intensity filter embodiments constitutes a layer which differs in thickness from the other magnetic bubble layers. Each magnetic bubble array is also electronically driven by its own bubble propagating circuit which produces, in most embodiments, a different "local phase" or "local transmissivity" which is a function of whether a bubble or an empty space is propagated to the location. The number of levels of transmitted phase or intensity and phase is an exponential function of the number of magnetic bubble layers, thus n layers provides 2.sup.n steps of transmitted phase or intensity and phase modification and a four layer structure provides a sixteen level phase or phase and intensity display. The electronic portion of the structure may be driven by signals representing mathematical expressions, patterns, manual inputs and the like to generate holograms, kineform lenses, complex filters, three-dimensional television pictures, and other display and optical information processing applications.
REFERENCES:
patent: 3460116 (1969-08-01), Bobeck et al.
patent: 3526883 (1970-09-01), Tabor
patent: 3893023 (1974-01-01), Otala
IBM Bulletin vol. 13, No. 12 May 1971 p. 3718.
IBM Bulletin vol. 15, No. 7 Dec. 1972 pp. 2213-2216.
IBM Bulletin vol. 13, No. 1, June 1970 p. 147.
Goodwin John J.
International Business Machines - Corporation
Richardson Robert L.
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