Eyepiece including an aspherical lens surface

Details Eyepiece including an aspherical lens surface Eyepiece including an aspherical lens surface

1996-02-07

1997-05-06

Epps, Georgia Y.

Optical: systems and elements

Lens

Eyepiece

359716, 359792, G02B 2500, G02B 302

Patent

active

056276800

ABSTRACT:
An eyepiece having an apparent visual angle of 40.degree. or greater is provided, in succession from the eyepoint side, with a first lens unit G1 having positive refractive power, a second lens unit G2 having positive refractive power, and a third lens unit G3 having positive refractive power. The first lens unit G1 has a positive lens component, the second lens unit G2 has a positive lens component, and the third lens unit G3 has a cemented lens consisting of a positive lens component and a negative lens component. At least one of the lens surfaces of the first to third lens units G1 to G3 is formed into an aspherical shape.

REFERENCES:
patent: 2206195 (1940-07-01), Konig
patent: 2603128 (1952-07-01), Miles
patent: 2859560 (1958-04-01), Tackaberry
patent: 4099842 (1978-07-01), Kaneko
patent: 5162945 (1992-11-01), Matsuo et al.

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