Optical: systems and elements – Holographic system or element – Having optical element between object and recording medium
Patent
1994-03-09
1995-10-17
Gross, Anita Pellman
Optical: systems and elements
Holographic system or element
Having optical element between object and recording medium
359 40, 348740, G02F 113, G02F 11335, H04N 912
Patent
active
054595916
ABSTRACT:
The present invention relates to beam steering and scanning devices which utilize an imaging cell which incorporates a solid-state cholesteric liquid crystal (CLC) element, an electronically controlled, variable half-wave retarder and a source of circularly polarized light. The CLC element is disposed at an angle (45.degree.) relative to the path along which light from the source is projected and is designed to reflect, at a given wavelength, one circular polarization of light and transmit the other. Using this characteristic, light of one polarization or the other is presented to the variable retarder and depending on whether or not it is actuated, light is either diverted into another orthogonal path or remains in the original path. If another similar imaging cell is disposed in the orthogonal path, light incident on that cell can also be diverted into yet another path or transmitted along the orthogonal path under control of a half-wave retarders associated with said another imaging cells. By arranging a plurality of imaging cells in the form of an array and accessing each row of the cells of the array with a column of similar imaging cells and by selectively activating half-wave retarders associated with each of the cells, monochromatic or polychromatic light from a single source or multiple sources may be steered to a selected cell and reflected from its associated CLC element or elements. Utilizing successive cells in the array and causing reflection of a modulated beam or beams provides a frame in the manner of the usual TV set which is viewed by the eyes as an integrated picture. Successive frames, of course, provide the usual moving images.
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Gross Anita Pellman
Kilgannon, Jr. Thomas J.
Miller Charles
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