Dual purpose infrared lens assembly using diffractive optics
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United States of America Patent
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-
Dec 22, 1998
Grant Date -
N/A
app pub date -
Jan 23, 1997
filing date -
Mar 4, 1996
priority date (Note) -
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status (Latency Note)
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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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