Wide field eyepiece lens system

Details Wide field eyepiece lens system Wide field eyepiece lens system

1976-12-08

1978-07-11

Sacher, Paul A.

350176, 350220, 350229, G02B 930, G02B 934

Patent

active

040998428

ABSTRACT:
An eyepiece lens system having an apparent field of view more than 60.degree. and an eye relief greater than 80% of the total focal length of itself comprises a first lens group, a second lens group disposed rearwardly of the first lens group and a third lens group disposed rearwardly of the second lens group. The first lens group includes a positive meniscus lens component with its convex surface facing rearward, the second lens group includes a cemented positive doublet lens component consisting of a biconvex lens element and a negative meniscus lens element, and the third lens group includes at least a positive meniscus lens component with its convex surface facing forward. The eyepiece lens system satisfies predetermined optical conditions.

REFERENCES:
patent: 3888567 (1975-06-01), Shoemaker
patent: 3975088 (1976-08-01), Shoemaker

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