Eyepiece with broad visibility

Details Eyepiece with broad visibility Eyepiece with broad visibility

1997-03-07

1998-09-29

Epps, Georgia Y.

Optical: systems and elements

Lens

Eyepiece

359643, G02B 2500

Patent

active

058153179

ABSTRACT:
An eyepiece with a wide field of view is made up of only a few spherical lenses, has a wide viewing angle, and includes eye relief of extensive length. The intrinsic aberration and the aberration of the pupil are favorably corrected. The eyepiece includes, in order from an object side, a positive meniscus lens having a convex surface which faces an eyepoint, a bonded biconvex lens made up of a biconvex lens and a negative meniscus lens with a concave surface facing the object side, and a positive lens with a convex surface which faces the object side. The bonded surface of the bonded biconvex lens has negative refractivity. The positive lens with the convex surface facing the object side is either a plano-convex lens with a planar side facing the eyepoint side or a positive meniscus lens with a concave surface facing the eyepoint side. Certain prescribed conditional equations are satisfied.

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

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