G - Physics – 02 – B
Patent
G - Physics
02
B
88/0.1
G02B 5/28 (2006.01) G02B 5/18 (2006.01)
Patent
CA 1079552
Abstract of the Disclosure The disclosed filter provides a gray-scale color (wavelength) characteristic which is substantially independent of luminosity, and is preferably neutral. Such a gray scale is achieved in diffractive subtractive light filter comprising: at least one region consisting of a mixture of black-manifesting subareas and white-manifesting subareas; where each black- manifesting subarea comprises a diffractive structure composed of at least one substantially sine-wave profile phase grating having a line spacing sufficient to permit the separation of substantially all higher-diffraction-order light from imaged zero- diffraction-order light, any of said phase gratings having an optical peak-to-peak amplitude of a selected value which provides a zero-diffraction-order light transmittance wavelength selectivity characteristic which exhibits a minimum zero-diffraction-order light transmittance at a wavelength within the visible wavelength spectrum; where each white- manifesting subarea comprises a substantially non- diffractive structure; and where the respective sizes of said individual subareas are sufficiently small to be substantially unresolvable in imaged zero- diffraction-order light, but are large relative to said line spacing.
328791
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