Dual purpose infrared lens assembly using diffractive optics

Details Dual purpose infrared lens assembly using diffractive optics Dual purpose infrared lens assembly using diffractive optics

1997-01-23

1998-12-22

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359354, 359357, 359558, 359684, G02B 1514, G02B 1314, G02B 518

Patent

active

058525165

ABSTRACT:
An infrared zoom lens assembly (16) operative as either a continuous zoom or a two-position zoom lens. The infrared zoom lens assembly (16) includes a focusing component (33), a collecting component (37) and a diffracting component (41). The focusing component (33) includes a first focusing zoom lens (34) positioned at the same location at the ends of the zoom range and a second focusing zoom lens (36) movably mounted in the infrared zoom lens assembly (16). The diffracting component (41) may be used to correct color aberrations associated with an infrared waveband. The focusing component (33) and the collecting component (37) cooperate with the diffracting component (41) to focus infrared radiation at an image plane (15) of an infrared detector (18).

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