Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1999-07-14
2000-08-29
Epps, Georgia
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359634, G02B 2714
Patent
active
061117013
ABSTRACT:
A multi-color optical display system is designed with a bi-fold prism assembly in a relay lens that, together with a multi-spectrally reflecting optical combiner, longitudinally corrects a multi-colored image composed of two or more discrete wavelengths of light. The prism assembly for a preferred two-color image typically includes three light reflecting surfaces, the first of which may be flat or curved and coated with a spectrally reflective coating of a given wavelength; the second of which is flat or curved, coated with a spectrally reflective coating of a given second wavelength, and spaced a small amount from the first surface; and the third of which is flat, separated from the first two by a large distance and angle, and uncoated. The coatings are chosen to each reflect a specific wavelength range of colored light used in the display system and to transmit all other wavelengths. The spacing between and/or curvatures of the first two surfaces are dictated by chromatic aberrations introduced by monochromatic optical elements used in the relay lens. Specifically, each surface is positioned so that the focal point of the corresponding color component in an intermediate image created by the relay lens is located at the focal point of the combiner, so that the final virtual image reflected by the combiner is longitudinally color corrected.
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Eppele Kyle
Epps Georgia
Jensen Nathan O.
Mack Ricky
O'Shaughnessy J. P.
LandOfFree
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