Transparent covering having an antireflection coating for signs,

Details Transparent covering having an antireflection coating for signs, Transparent covering having an antireflection coating for signs,

1985-11-07

1988-02-16

Kittle, John E.

350 17, 350166, G02B 522

Patent

active

047251093

ABSTRACT:
A layer (2) of a substance of high refractive index having an optical thickness of ##EQU1## and a layer (3) of a substance of low refractive index having an optical thickness of ##EQU2## as well as a layer (4) of a substance of high refractive index having an optical thickness of ##EQU3## and a layer (5) of a substance of low refractive index having an optical thickness of ##EQU4## are arranged as an antireflection coating on a transparent covering (1) of display devices, the wavelengths .lambda.1 and .lambda.2 being in a ratio of 1:1,5 to 1:3.

REFERENCES:
patent: 4265991 (1981-05-01), Hirai et al.

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