Microscope objective

Details Microscope objective Microscope objective

2011-06-21

2011-06-21

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

Microscope objective

C359S656000

Reexamination Certificate

active

07965450

ABSTRACT:
A microscope objective includes at least five lens components, which are divided into three groups that are, in order from an object side: a front group having a positive refracting power as a whole and having a meniscus lens component with an object-side surface thereof being concave toward the object side; a middle group having a positive refracting power as a whole and having a plurality of cemented lens components; and a rear group having a pair of concave air-contact surfaces arranged adjacent and opposite to one another, wherein the following conditions are satisfied: 3≦D0/f≦6 and 1≦H2/H1≦1.5, where D0is an axial distance from an object surface to a rearmost surface of the microscope objective, f is a focal length of the microscope objective, H2is a height of a marginal ray as emergent from the rearmost surface of the microscope objective, and H1is a maximum height of the marginal ray as passing through the front group and the middle group.

REFERENCES:
patent: 5920432 (1999-07-01), Suenaga et al.
patent: 6501603 (2002-12-01), Kasahara
patent: 7382542 (2008-06-01), Wartmann
patent: 2010/0091101 (2010-04-01), Fujimoto et al.
patent: 11-231224 (1999-08-01), None
patent: 2001-021812 (2001-01-01), None

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