公开(公告)号：US20210278639A1

公开(公告)日：2021-09-09

申请号：US15104933

申请日：2014-12-04

Applicant: THALES

Inventor： Catherine ANTIER ,  Thierry MIDAVAINE

IPC: G02B13/06 ,  G02B27/10 ,  G02B13/14

Abstract: An imaging module comprises: a single-pupil head component with hyper-hemispherical entrance field with refractive entrance surface, concave exit face, a refractive central zone and reflective peripheral zone, and comprising a secondary mirror, an aberrations corrector which comprises an aspherical lens, a focusing objective, an aperture diaphragm between the aberrations corrector and the objective. The head component is quasi-afocal in the vicinity of the field of 90° angular radius, its entrance surface has a ½ vertex angle of smaller than 30°, the secondary mirror is aspherical with variable local focal length with a maximum local power for a zone used by a field of 90° angular radius and minimum smaller by at least a factor of 2 for a zone used by a field of angular radius smaller than 20°.