Microscope objective

Details Microscope objective Microscope objective

2007-12-05

2010-02-16

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

Microscope objective

C359S368000

Reexamination Certificate

active

07663807

ABSTRACT:
A microscope objective includes, in order from the object side, a first lens unit with positive refracting power, having two meniscus lenses, each with a concave surface facing the object side, and at least one positive lens; a second lens unit with positive refracting power; and a third lens unit having concave surfaces adjacent and opposite to each other configured as air contact surfaces. The microscope objective satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?7≦fin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.5<NAin-line-formulae description="In-line Formulae" end="tail"?where f is the focal length (mm) of the microscope objective and NA is the numerical aperture of the microscope objective on the entrance side.

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