Infrared zoom lens and infrared camera

Optical: systems and elements – Having significant infrared or ultraviolet property – Lens – lens system or component

Reexamination Certificate

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Details

C359S690000

Reexamination Certificate

active

07859747

ABSTRACT:
A small-sized and low-cost infrared zoom lens while maintaining the brightness of an image and relevant arts to the infrared zoom lens is provided. The infrared zoom lens1ais made up of first to third lens groups G1to G3formed of zinc sulfide. The first lens group G1is made up of one or two lenses and has a positive refractive power. The second lens group G2is made up of one or two lenses and has a negative refractive power. The third lens group G3is made up of two or more lenses and has a positive refractive power as the whole lens group and also includes a positive meniscus lens with a convex face pointed at the object side as a final lens on the image surface side. At the zooming time, the second lens group G2is moved along the optical axis. At least one of the lens surfaces of the first to third lens groups G1to G3is a diffraction surface. At least one of the lens surfaces of the first and third lens groups G1and G3is an aspheric surface.

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