Wide-angle eyepiece lens with large eye relief

Details Wide-angle eyepiece lens with large eye relief Wide-angle eyepiece lens with large eye relief

1998-02-09

2000-08-15

Epps, Georgia

Optical: systems and elements

Lens

Eyepiece

359644, 359645, G02B 2500

Patent

active

06104542&

ABSTRACT:
Wide-angle eyepiece lenses for a microscope are disclosed. A representative lens comprises, from the object side to the eye side, a first lens group with positive refractive power, a second lens group with a concave surface facing the object side and a surface (closest to the object side) contacting air, and a third lens group with positive refractive power and at least one surface contacting air. One or both of the surface of the second lens group closest to the object side and the air-contacting surface of the third lens group is aspherical.

REFERENCES:
patent: 5619379 (1997-04-01), Fukumoto
patent: 5671092 (1997-09-01), Estelle
patent: 5815317 (1998-09-01), Omura
patent: 5872658 (1999-02-01), Ori

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