Far-infrared camera lens, lens unit, and imaging apparatus

Details Far-infrared camera lens, lens unit, and imaging apparatus Far-infrared camera lens, lens unit, and imaging apparatus

2008-03-17

2010-11-16

Font, Frank G (Department: 2872)

Optical: systems and elements

Having significant infrared or ultraviolet property

Lens, lens system or component

C359S784000

Reexamination Certificate

active

07835072

ABSTRACT:
Three lenses formed of ZnS are used in combination. A first lens is a meniscus lens having a middle portion which is convex on an object side. A second lens has a middle portion that is a meniscus, which is concave on an object side and has positive refractive power, and a peripheral portion, which is convex on the object side. The first and second lenses have positive refractive power in combination. A third lens is provided adjacent to the second lens with a distance therebetween 1 mm or less and has a middle portion, which is a convex meniscus on an object side, and a peripheral portion which is concave on the object side. A diffraction surface is formed in either surface of the lens.

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