Diffractive subtractive color filter responsive to angle of inci

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283 91, 283902, 3501622, 35016221, G02B 518

Patent

active

044847971

ABSTRACT:
A variable index-of-refraction optical medium of certain minimum thickness and periodicity with respect to the wavelength of incident light--if it meets certain specified constraints with respect to (1) relative indices-of-refraction of both its internal structure and that of its surroundings and (2) relative values of incident wavelength to periodicity and the relative indices-of-refraction--operates to produce both angularly-dependent subtractive-color filter reflection spectra and subtractive-color filter transmission spectra in accordance with its physical parameters. Such filters are suitable for use as authenticating devices for sheet-material authenticated items.

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patent: 4255019 (1981-03-01), Knop
patent: 4277138 (1981-07-01), Dammann
patent: 4400057 (1983-08-01), Moraw et al.

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