Wide-field eyepiece lens

Details Wide-field eyepiece lens Wide-field eyepiece lens

1996-06-13

1998-06-30

Epps, Georgia Y.

Optical: systems and elements

Lens

Eyepiece

G02B 2500

Patent

active

057742707

ABSTRACT:
An eyepiece lens suitable for use in microscopes, binoculars, and the like is disclosed. The eyepiece lens provides a large eye relief of more than 80 percent of the focal length of the eyepiece lens in an apparent field of view of more than 60 degrees, preferably more than 70 degrees, while favorably correcting various aberrations such as distortion up to the perimeter of the apparent field of view of the eyepiece lens. The eyepiece lens is disposed on the eye side of a real image plane of an objective lens with which the eyepiece lens is used, and comprises, in order from the objective side, a first cemented lens L.sub.1, preferably a doublet, a second cemented lens L.sub.2, preferably a doublet, a first positive lens element L.sub.3, and a second positive lens element L.sub.4. The eyepiece lens preferably satisfies a number of quantitative conditions.

REFERENCES:
patent: 3384434 (1968-05-01), Scidmore et al.
patent: 3464764 (1969-09-01), Scidmore et al.
patent: 3586418 (1971-06-01), Abe
patent: 4099842 (1978-07-01), Kaneko
patent: 4497546 (1985-02-01), Kobayashi
patent: 4792214 (1988-12-01), Wickholm et al.

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