Eyepiece

Details Eyepiece Eyepiece

1994-07-01

1996-08-13

Epps, Georgia Y.

Optical: systems and elements

Lens

Multiple component lenses

359708, G02B 906

Patent

active

055462375

ABSTRACT:
An eyepiece which has a simple lens group construction of a relatively small number of lenses and which is reduced in aberration and increased in field angle. The eyepiece includes, as arranged in the order from an eyepoint side, a first lens group of a positive refractive power composed of a cemented lens of a negative lens and a positive lens, and a second lens group of a positive refractive power composed of a single positive lens. With the positive lens of the second lens group, at least one of the lens surfaces is an aspherical surface. With f representing the focal length of the eyepiece, f.sub.1 the focal length of the first lens group, and D the spacing between the first and second lens groups, the eyepiece satisfies the following conditions.

REFERENCES:
patent: 4183624 (1980-01-01), Rogers et al.

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