Infrared zoom lens assembly having a variable F/number

Details Infrared zoom lens assembly having a variable F/number Infrared zoom lens assembly having a variable F/number

1997-01-23

1998-08-18

Nelms, David C.

Optical: systems and elements

Having significant infrared or ultraviolet property

Including continuously variable magnification or focal length

359357, 359565, 359676, G02B 1514, G02B 1314, G02B 2744

Patent

active

057965145

ABSTRACT:
An infrared lens assembly (16) having a variable F/Number. The infrared lens assembly (16) includes a focusing component (33), a collecting component (37), an aperture stop (46), and a diffracting component (41). The focusing component (33) may include a first and a second focusing zoom lens (34, 36) movably mounted in the infrared lens assembly (16). The focusing component (33) and the collecting component (37) may be formed from high dispersion, low index material. The aperture stop (46) may be mounted to the second focusing zoom lens (36) to vary the F/Number between a retracted zoom position and an extended zoom position. The diffracting component (41) may include a diffractive surface 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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U.S. Pat. application Ser. No. 08/289,404, filed Aug. 12, 1994, "Durable Polomeric Optical Systems", Issuance Pending--Issue Fee Paid an Jan. 17, 1997. Now Patented, w/ PN 5,629,074 as of May 13, 1997.

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