Eyepiece system with positive meniscus lens on object side

Details Eyepiece system with positive meniscus lens on object side Eyepiece system with positive meniscus lens on object side

1998-01-07

2000-05-16

Epps, Georgia

Optical: systems and elements

Lens

Eyepiece

359643, G02B 2500

Patent

active

06064530&

ABSTRACT:
An eyepiece system includes a first meniscus lens of positive power having a convex surface located on the object side and a cemented lens element composing of a second and a third lens element of positive power. The eyepiece system satisfies the conditions: (1) 0.2<f.sub.e /f.sub.1 <0.65 and (2) 0.6<f.sub.e /f.sub.23 <1.0, wherein f.sub.1 represents the focal length of the first lens element, f.sub.e represents the focal length of the entire system, and f.sub.23 represents the resultant focal length of the second and third lens elements.

REFERENCES:
patent: 5546237 (1996-08-01), Fukumoto
patent: 5790313 (1998-08-01), Kanai
patent: 5812324 (1998-09-01), Fukumoto
patent: 5815317 (1998-09-01), Omura

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