Black and white diffractive subtractive light filter

G - Physics – 02 – B

Patent

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Details

88/0.1

G02B 5/28 (2006.01) G02B 5/18 (2006.01) G02B 27/44 (2006.01)

Patent

CA 1071447

Abstract of the Disclosure The disclosed diffractive subtractive filter provides a high contrast between black and white together with a substantially neutral black. 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. -1-

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