Black-and-white diffractive subtractive light filter

Details Black-and-white diffractive subtractive light filter Black-and-white diffractive subtractive light filter

1976-03-29

1977-12-13

Corbin, John K.

350162SF, 350314, G02B 518, G02B 522

Patent

active

040626288

ABSTRACT:
The disclosed filter provides (1) a high contrast between black and white together with a substantially neutral black and/or (2) a gray-scale color (wavelength) characteristic which is substantially independent of luminosity, and is preferably neutral. Neutral black is achieved when two superimposed, crossed, sine-wave gratings embossed in plastic have different depths which are selected to provide a zero-diffraction-order-light transmittance wavelength selectivity characteristic for any one of the phase gratings which exhibits a minimum zero-diffraction-order-light transmittance at desired different wavelengths in the visible spectrum. A gray scale is achieved by mixing black-manifesting subareas with white-manifesting subareas.

REFERENCES:
patent: 3732363 (1973-05-01), Glenn, Jr
patent: 3957354 (1976-05-01), Knop

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