Zoom eyepiece lens system

Details Zoom eyepiece lens system Zoom eyepiece lens system

2011-03-08

2011-03-08

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

Eyepiece

C359S643000, C359S689000, C359S716000, C359S740000, C359S784000, C359S791000

Reexamination Certificate

active

07903343

ABSTRACT:
A zoom eyepiece lens system EL includes, in order from an eyepoint EP side: a first lens group G1having positive refractive power; a second lens group G2having positive refractive power; and a third lens group G3having negative refractive power. Upon zooming from a low magnification end state to a high magnification end state, the second lens group G2and the third lens group G3move along an optical axis in opposite directions with each other. The second lens group G2includes, in order from the eyepoint EP side, a first lens L3having negative refractive power, a second lens L4having positive refractive power, and a third lens L5having positive refractive power. At least one aspherical surface is formed on the third lens L5.

REFERENCES:
patent: 5663834 (1997-09-01), Koizumi
patent: 6384984 (2002-05-01), Ishii et al.
patent: 9-80326 (1997-03-01), None
patent: 2001-242390 (2001-09-01), None

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