Microscope objective lens

Details Microscope objective lens Microscope objective lens

1997-01-31

1998-03-17

Nguyen, Thong

Optical: systems and elements

Lens

Microscope objective

359656, 359792, G02B 2102, G02B 912

Patent

active

057293910

ABSTRACT:
A plan apochromatic microscope objective lens is disclosed having few constituent lens elements, a large numerical aperture, excellent flatness across the entire field of view of the objective lens, and a relatively long working distance. The objective lens comprises, in order from the object side, first, second, and third lens groups. The first lens group comprises a meniscus lens having a concave surface oriented toward the object side, and a positive meniscus lens having a concave surface oriented toward the object side. The second lens group comprises a simple lens, a cemented lens including a negative lens and a positive lens, and a cemented lens including a positive lens and two negative lenses. The third lens group comprises a cemented lens with overall weak refractive power and including a positive lens and a negative lens. The objective lens satisfies a number of conditional expressions.

REFERENCES:
patent: 4184747 (1980-01-01), Uetake
patent: 5216545 (1993-06-01), Saito
patent: 5469299 (1995-11-01), Nagano
patent: 5532878 (1996-07-01), Suenaga et al.

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