Microscopic objective having a long working distance

Details Microscopic objective having a long working distance Microscopic objective having a long working distance

1998-04-14

2000-05-30

Dang, Hung Xuan

Optical: systems and elements

Lens

With variable magnification

359691, G02B 1514

Patent

active

06069744&

ABSTRACT:
The invention provides a microscope objective having a working distance longer than achieved so far in the prior art even at more than 100 magnifications. The objective comprises a lens group A that comprises a positive meniscus lens concave toward an object side thereof and a plurality of cemented lenses, has positive refractive power and converts light rays from an object to a converging light beam, and a lens group B having negative refractive power, and satisfies condition (1):

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