Eyepiece

Details Eyepiece Eyepiece

1994-07-18

1996-09-17

Sugarman, Scott J.

Optical: systems and elements

Lens

Eyepiece

359717, G02B 2500, G02B 1318

Patent

active

055574637

ABSTRACT:
An eyepiece capable of compensating, various aberrations despite its simple construction including a relatively small number of lenses. The eyepiece includes, in the order from an eyepoint side, a first lens group of a positive refractive power composed of a single positive lens and a second lens group of a positive refractive power composed of a cemented lens of a positive lens and a negative lens, and the positive lens of the first lens group has at least one of its lens surfaces formed into an aspherical surface shape. The radius of curvature at the peripheral portion of the aspherical surface is greater than the radius of curvature at the apex portion of the aspherical surface.

REFERENCES:
patent: 2528468 (1950-10-01), Cojan
patent: 3472577 (1969-10-01), Rosin et al.
patent: 5162945 (1992-11-01), Matsuo et al.

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