Optical: systems and elements – Prism – With reflecting surface
Patent
1989-08-29
1992-01-21
Wimer, Michael C.
Optical: systems and elements
Prism
With reflecting surface
359 70, 359 93, G02F 143
Patent
active
050823540
ABSTRACT:
An apparatus and method for providing optical switching or color selection capability uses cholesteric liquid crystals which reflect and transmit circularly polarized light and a variable wave retarder element together with phase reversing mirrors which recapture and recombine the reflected circularly polarized light. With the retarder element in a first state, first orientation circularly polarized light is completely transmitted and second orientation circularly polarized light is redirected. Alternatively, a color selection assembly is provided through the use of a combination of cholesteric light crystals in which light of a first color is given a first polarization orientation and light of a second color is given a second polarization orientation. Depending upon the state of the retarder either the first or second color is transmitted to a desired target.
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patent: 4478494 (1984-10-01), Soref
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patent: 4726660 (1988-02-01), Rushford
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patent: 4913529 (1990-04-01), Goldenberg et al.
James Adams et al., Cholesteric Films as Optical Filter Journal of Applied Physics, vol. 42, No. 10.
Canter Bruce M.
Ho Tan
Kaiser Aerospace and Electronics Corporation
Kleinberg Marvin H.
Wimer Michael C.
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