Eyepiece

Details Eyepiece Eyepiece

1995-03-17

1997-11-25

Epps, Georgia Y.

Optical: systems and elements

Lens

Eyepiece

359715, G02B 2500, G02B 0302

Patent

active

056918500

ABSTRACT:
An eyepiece has an apparent visual angle of 40.degree. or more, and is constituted by, in the following order from the eyepoint side, a first lens group including a cemented lens of negative and positive lens components and having a positive refractive power, a second lens group including a single positive lens component, a third lens group including a cemented lens of positive and negative lens components and having a positive refracting power, and a fourth lens group including a single negative lens component. At least one surface in these lens groups is an aspherical surface, and the fourth-order aspherical surface coefficient of the aspherical surface satisfies .vertline.C.sub.4 .vertline..ltoreq.1.times.10.sup.-3.

REFERENCES:
patent: 5005957 (1991-04-01), Kanamori et al.
patent: 5305147 (1994-04-01), Hasegawa et al.
patent: 5329401 (1994-07-01), Sato
patent: 5379154 (1995-01-01), Shibayama et al.

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