Optical: systems and elements – Lens – Multiple component lenses
Patent
1998-08-17
2000-05-30
Sugarman, Scott J.
Optical: systems and elements
Lens
Multiple component lenses
359770, 359781, 359644, 359643, G02B 934, G02B 960, G02B 2500
Patent
active
060697504
ABSTRACT:
A wide-field eyepiece, formed of at least four lens groups and five lens elements, is disclosed which satisfies predetermined conditional expressions, so as to provide an eyepiece having an angle of view of at least 65 degrees with less than 6% distortion. The wide-field eyepiece is formed of, in order from the side of an image position 1 formed by an objective lens (not illustrated): a first lens group G.sub.1 of negative refractive power that includes a first lens element L.sub.1 having a concave surface on both sides, a second lens group G.sub.2 of positive refractive power that includes a second lens element L.sub.2 having a convex surface on the side of an observer's eye position, a third lens group G.sub.3 of positive refractive power wherein a lens element surface thereof has a convex surface on both sides and is cemented to a negative lens element having a concave surface on the side nearest the image 1 formed by the objective lens; and a fourth lens group G.sub.4 of positive refractive power and including a lens element with different radii of curvature on its opposite sides, with the surface of larger radius of curvature lying on the side of an observer's eye position.
REFERENCES:
patent: 4747675 (1988-05-01), Nagler
patent: 5659422 (1997-08-01), Fukumoto
patent: 5774270 (1998-06-01), Yanari
patent: 5812324 (1998-09-01), Fukumoto
Koizumi Noboru
Watanabe Naomi
Arnold Bruce Y.
Fuji Photo Optical Co., Ltd.
Letendre Suzanne
Sugarman Scott J.
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