Lenses

Details Lenses Lenses

1976-12-06

1980-01-15

Sacher, Paul A.

350176, 350216, G02B 960

Patent

active

041836243

ABSTRACT:
A biocular magnifying lens suitable for use as an eyepiece in a night vision device comprises from front to back a positive element which is bi-convex or meniscus convex towards the front, a negative meniscus element concave towards the front, a positive singlet or doublet element which is convex towards the front, a positive element which is bi-convex or meniscus convex towards the front, and a positive meniscus element convex towards the front.

REFERENCES:
patent: 2416442 (1947-02-01), Grey
patent: 2549158 (1951-04-01), Bertele
patent: 2862418 (1958-12-01), Lowenthal
patent: 3384434 (1968-05-01), Scidmore et al.
patent: 3623791 (1971-11-01), Vetake
patent: 3823999 (1974-07-01), Versteeg
patent: 3922072 (1975-11-01), Rogers

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