High-efficiency polarized light source
First Claim
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1. A polarization system consisting of:
- a light source;
collimating means for aligning light from said light source into a first beam consisting of substantially parallel light rays;
first splitting means for splitting said first beam into a first plurality of beams, each of said first plurality of beams having a substantially different wavelength band;
a plurality of second splitting means for splitting said first plurality of beams into a second and third plurality of beams, said second and third pluralities of beams having substantially perpendicular polarization states;
a plurality of retarding means for changing the polarization of said second plurality of beams such that said second and third pluralities of beams consist of substantially parallel polarization states;
a plurality of linearly aligned reflecting means for aligning said second and third plurality of beams to be substantially parallel;
recombining means for combining said second plurality of beams into a single second beam and said third plurality of beams into a single third beam, said second beam and said third beam oriented in a substantially parallel manner; and
imaging means for focusing said second and third beams, thereby creating an image with substantially a single polarization, said image being suitable for input to an optical system requiring polarized light.
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Abstract
An optical system is disclosed which combines a collimating lens with a half wave plate, a polarizing beam splitter, and imaging optics to create a polarized image of a non-polarized light source. This optical system has significant benefits of energy efficiency and brightness.
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Citations
3 Claims
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1. A polarization system consisting of:
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a light source; collimating means for aligning light from said light source into a first beam consisting of substantially parallel light rays; first splitting means for splitting said first beam into a first plurality of beams, each of said first plurality of beams having a substantially different wavelength band; a plurality of second splitting means for splitting said first plurality of beams into a second and third plurality of beams, said second and third pluralities of beams having substantially perpendicular polarization states; a plurality of retarding means for changing the polarization of said second plurality of beams such that said second and third pluralities of beams consist of substantially parallel polarization states; a plurality of linearly aligned reflecting means for aligning said second and third plurality of beams to be substantially parallel; recombining means for combining said second plurality of beams into a single second beam and said third plurality of beams into a single third beam, said second beam and said third beam oriented in a substantially parallel manner; and imaging means for focusing said second and third beams, thereby creating an image with substantially a single polarization, said image being suitable for input to an optical system requiring polarized light. - View Dependent Claims (2, 3)
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Specification
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Current AssigneeTransamerica Business Credit Corporation (Aegon Ltd.)
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Original AssigneeGreyhawk Systems, Inc.
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InventorsLoucks, Bryan E.
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Primary Examiner(s)Arnold, Bruce Y.
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Assistant Examiner(s)Lerner, Martin
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Application NumberUS07/462,416Time in Patent Office707 DaysField of Search350/394, 350/401, 350/404, 350/420, 350/172, 350/173, 353/20, 353/31, 353/34US Class Current359/487.04CPC Class CodesG02B 27/283 used for beam splitting or ...H04N 9/3167 for polarizing the light be...
