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

C359S789000

Reexamination Certificate

active

07835071

ABSTRACT:
A far-infrared camera includes three lenses formed of ZnS. A first lens is a biconvex lens, a second lens is a negative meniscus or biconcave lens, and a third lens is a positive meniscus lens. A diffraction surface is formed in either surface of a lens. When a total focal distance f of the lens system is 10 mm to 30 mm and a focal distance f12of the first and second lenses is 20 mm to 70 mm, 1≦f12/f≦3.

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