Optical filter

Optical: systems and elements – Lens – Selective wavelength transmitting or blocking

Patent

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Details

359588, G02B 520

Patent

active

051738082

ABSTRACT:
A filter is provided for blocking a major portion of the light impinging thereon but transmitting three narrow spectral pass bands of light having selected wavelengths. The number of pass bands and the wavelengths included in each pass band are selected in accordance with environmental or military conditions dictating the wavelengths of light that need to be filtered. The transmitted narrow spectral pass bands preferably are spaced approximately equally about the CIE chromaticity diagram. The resulting filter enables exceptional seeing and color differentiation while positively blocking broad ranges of potentially injurious light from passing therethrough.

REFERENCES:
patent: 4933110 (1990-06-01), Tucker
patent: 4935166 (1990-06-01), Lee et al.

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