Optical system and optical apparatus including optical system

Details Optical system and optical apparatus including optical system Optical system and optical apparatus including optical system

2011-01-04

2011-01-04

Collins, Darryl J. (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S795000, C359S689000, C359S690000, C359S686000, C359S683000

Reexamination Certificate

active

07864456

ABSTRACT:
An optical system includes a first optical element and a second optical element on at least one of an enlargement side and a reduction side relative to a point P at which a light axis and a paraxial chief ray intersect. Each of the first optical element and second optical element is composed of a solid material having a refractive light incident surface and a refractive light emergent surface. The optical system satisfies the following conditional expressions: ΔθgF1>0.0272, ΔθgF2<−0.0278, and f1×f2<0 where ΔθgF1and ΔθgF2denote anomalous partial dispersion values of the first and second optical elements for the g-line and F-line, respectively, and f1and f2denote focal lengths of the first and second optical elements, respectively, when the light incident surfaces and the light emergent surfaces of the first and second optical elements are in contact with air.

REFERENCES:
patent: 7480102 (2009-01-01), Yokoyama
patent: 7643228 (2010-01-01), Ishibashi

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