Optical lens

Details Optical lens Optical lens

1977-06-27

1979-03-27

Sacher, Paul A.

G02B 308

Patent

active

041463064

ABSTRACT:
An optical lens having smooth outer surfaces includes at least two layers of different materials and different indices of refraction. Each layer has Fresnel type undulations forming optically active surfaces which interfit or mate with complementary undulations on an adjacent layer in a surface-to-surface and void-free condition. The layers are either fused together or held together by a transparent cement.

REFERENCES:
patent: 3712713 (1973-01-01), Appledorn
patent: 3752575 (1973-08-01), Ataka
patent: 3861785 (1975-01-01), Barbour

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