Eyepiece lens with wide apparent field of view

Details Eyepiece lens with wide apparent field of view Eyepiece lens with wide apparent field of view

1996-09-03

1998-03-10

Font, Frank G.

Optical: systems and elements

Lens

Eyepiece

359643, 359716, G02B 2500, G02B 302

Patent

active

057268088

ABSTRACT:
Eyepiece lenses are disclosed that provide a wide apparent field of view (.gtoreq.40.degree.) and that effectively correct optical aberrations even to the periphery of the apparent field of view. The eyepiece lens comprises, in order from the eye side, a first lens group G.sub.1 comprising a positive lens element, a second lens group G.sub.2 having positive refractive power and comprising either a positive lens element cemented to a negative lens element, or a negative lens element cemented to a positive lens element, and a third lens group G.sub.3 having positive or negative refractive power and comprising a positive lens element cemented to a negative lens element. At least one lens surface is aspherical. The eyepiece lens satisfies any of various quantitative expressions.

REFERENCES:
patent: 2186622 (1940-01-01), Bertele
patent: 2995980 (1961-08-01), Zimmermann et al.
patent: 3384434 (1968-05-01), Scidmore et al.
patent: 3623791 (1971-11-01), Uetake
patent: 4099842 (1978-07-01), Kaneko
patent: 5202795 (1993-04-01), Kashima
patent: 5568319 (1996-10-01), Kaneko et al.

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