The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 05, 2013
Filed:
Dec. 03, 2007
Bertrand Forestier, Paris, FR;
Paul Jougla, Paris, FR;
Bertrand Forestier, Paris, FR;
Paul Jougla, Paris, FR;
Thales, Neuilly sur Seine, FR;
Abstract
The invention relates to a dual-field (NF and WF) imaging system comprising an optronic detector () and an optical combination of narrow-field focal length Fhaving, an optical axis a front lens, a narrow-field entrance pupil situated in the vicinity of the front lens, a real wide-field entrance pupil, that is to say situated upstream of the front lens, an intermediate focal plane (IFP). The optical combination has, on the optical axis, the following refractive groups: a convergent front group Gof focal length F, where F<F/2, this group Gcomprising the front lens, a divergent field-change group Gthat can move along the optical axis, this group being situated upstream of the IFP in NF configuration and downstream of the IFP in WF configuration, a relay group Gimaging the IFP on the focal plane of the detector. The imaging system has a cooled IR2/IR3 detector and since the refractive groups have lenses, at least three different materials including CaFare used for the lenses of the front group G