Aspherical surface ocular lens

Details Aspherical surface ocular lens Aspherical surface ocular lens

1995-06-15

1997-04-08

Epps, Georgia Y.

Optical: systems and elements

Lens

Eyepiece

359645, 359646, 359716, 359717, G02B 2500, G02B 302

Patent

active

056193793

ABSTRACT:
An ocular lens includes, sequentially from an object side, a first lens unit G1 exhibiting a negative refracting power on the whole and a second lens unit G2 exhibiting a positive refracting power on the whole. An object-side focal surface of the second lens unit G2 is positioned between the first and second lens units G1, G2. At least one lens surface of the first lens unit G1 is formed in an aspherical shape.

REFERENCES:
patent: 3233513 (1966-02-01), Wagner et al.
patent: 5202795 (1993-04-01), Kashima

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