Patent ID: 9146383
Filing Date: 2015-09-29
Classification: G02B

Abstract:
1. A wide-angle optical assembly for an IR camera, comprising a lens system comprising an object-side lens, an image-side lens, and an aperture stop on an object-side of the assembly, wherein: the object-side lens and the image-side lens are positive meniscus lenses; all centers of vertex radii of the surfaces of the lenses are oriented towards the object-side, defining for each lens a concave surface and a convex surface; a thickness of the object-side lens is larger than 0.60 EFL; a thickness of the image-side lens is between 0.30 EFL and 0.70 EFL; 0.95<BFL/EFL<1.2; and, the EFL is between 55% and 75% of the image plane diagonal; and where EFL is the effective focal length of the optical assembly and BFL is the back focal length of the optical assembly.