Standardized multi-stack dielectric-layer filter blank and metho

Details Standardized multi-stack dielectric-layer filter blank and metho Standardized multi-stack dielectric-layer filter blank and metho

1983-07-11

1985-08-13

Arnold, Bruce Y.

350320, G02B 528

Patent

active

045346208

ABSTRACT:
A green-manifesting blank comprised of yellow and cyan dielectric stacks, one on top of the other, supported by a transparent substrate can be used to fabricate a green, yellow or cyan, and white color-encoding filter having any arbitrary given spatial pattern by combining dry-etching and wet etching, if the top layer of the bottom stack is composed of a material which is inert to a given wet etchant and the bottom layer of the top stack is composed of a material which is etched by the given wet etchant. Alternatively, the wet etching can be dispensed with if, after completion of the color-encoding filter, the filter is covered with an overcoat material exhibiting an index-of-refraction substantially equal to that of the bottom layer of the top stack.

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