Parfocal low-magnification microscope objective lens systems

Details Parfocal low-magnification microscope objective lens systems Parfocal low-magnification microscope objective lens systems

1975-10-10

1977-06-07

Corbin, John K.

350215, 350217, 350220, G02B 2102

Patent

active

040279510

ABSTRACT:
A parfocal low-magnification microscope objective lens system comprises, in succession from the object side, a positive first lens member, a negative second lens member and a positive third lens member. The first lens member has its concave surface facing the object; the second lens member includes at least one negative meniscus lens component with its concave surface facing the object; and the third lens member includes a positive lens component with that surface thereof sharper in radius of curvature facing the image plane side. The lens system satisfies the following four conditions: d.sub.A <f.sub.A <d.sub.A + .vertline.f.sub.B .vertline.; d.sub.A <d.sub.B ; .vertline.f.sub.B .vertline.<.vertline.f.sub.A .vertline.; and .vertline.d.sub.B .vertline.>.vertline.f.sub.B .vertline.; where f.sub.A and f.sub.B are the focal lengths of the first and the second lens member, respectively, d.sub.A is the distance from the rear principal plane of the first lens member to the front principal plane of the second lens member, and d.sub.B is the distance from the rear principal plane of the second lens member to the front principal plane of the third lens member.

REFERENCES:
patent: 3176583 (1965-04-01), Klein
patent: 3744881 (1973-07-01), Taira

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