Optical: systems and elements – Lens – Microscope objective
Patent
1995-02-14
1996-07-02
Epps, Georgia Y.
Optical: systems and elements
Lens
Microscope objective
359656, 359660, G02B 2102
Patent
active
055328784
ABSTRACT:
An objective lens system for a microscope comprises, sequentially from an object side, a first lens group having positive refracting power, a second lens group shiftable in an optical-axis direction and a third lens group. The first lens group has a cemented lens component composed of a plano-convex lens element with its plane surface toward the object side and a meniscus lens element with its concave surface toward the object side. The second lens group has a first sub-group having the positive refracting power and a second sub-group having negative refracting power. The second sub-group of the second lens group has a negative meniscus lens element with its concave surface toward an image side. The third lens group has a meniscus cemented lens component with its concave surface toward the image side. The objective lens system satisfies the following conditions: ##EQU1##
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patent: 5270860 (1993-12-01), Suzuki
Hayashi Itoe
Suenaga Yutaka
Epps Georgia Y.
Nikon Corporation
Papalas Michael A.
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