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:
Mar. 23, 1993
Filed:
Dec. 18, 1991
Daniel Wisshaupt, Orleans la Source, FR;
Thomson-Brandt Armements, Boulogne Billancourt, FR;
Abstract
Optical device rotational about an axis XX', and making use of a set of detectors suitably arranged to detect the presence of a target in a determined solid angle, of the type which includes in longitudinal section in a plane P in which lies the axis XX', a window including a front point A and a rear point B, which admits radiation coming from an axis H intersecting axis XX' at a point 0 and forming with it an angle .THETA. of less than 90.degree., the opening angle 2.tau. of the window being represented by the two straight lines 0'A and 0'B, each forming the angle .tau. with the axis H, characterized by the fact that it includes two mirrors M1, M2 and a converging lens, the mirror M1 being represented in the section of plane P by the arc of a parabola P.sub.m1 with its focus at a point F located in front of point 0, and having as its axis of symmetry an axis D1 parallel to H and passing through F, the mirror M2 being represented in the section of plane P by the arc of a parabola P.sub.m2 with its focus at the point F and having as its axis of symmetry an axis .delta. passing through F and forming with the axis XX' a small angle .alpha.; finally, the lens, having its optical center on the axis XX' approximately at the intersection of the parabola P.sub.m1 with this axis.