Objective lens

Details Objective lens Objective lens

2010-03-15

2010-12-07

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

Microscope objective

C359S657000, C359S658000

Reexamination Certificate

active

07848027

ABSTRACT:
An objective lens OL includes, in order from an object, a first lens group G1having positive refractive power, a second lens group G2having positive refractive power, a diffractive optical element GD forming a diffractive optical surface D thereon, and a third lens group G3having negative refractive power. The first lens group G1includes at least one cemented lens and the most object side surface thereof forms a concave surface facing the object. The second lens group G2includes at least one cemented lens. The third lens group G3includes at least one cemented negative lens. In the objective lens OL, a principal ray crosses an optical axis between the second lens group G2and the third lens group G3, and in the diffractive optical element GD, the diffractive optical surface D is disposed in the vicinity of the position where the principal ray crosses the optical axis.

REFERENCES:
patent: 5631779 (1997-05-01), Kashima
patent: 7593157 (2009-09-01), Suzuki et al.
patent: 6-347700 (1994-12-01), None
patent: 2001-305431 (2001-10-01), None
patent: 3312057 (2002-05-01), None

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