公开(公告)号：US11221468B2

公开(公告)日：2022-01-11

申请号：US15104933

申请日：2014-12-04

Applicant: THALES

Inventor： Catherine Antier ,  Thierry Midavaine

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

Abstract: An imaging module includes 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. The imaging module also includes a secondary mirror, an aberrations corrector having an aspherical lens, a focusing objective, and 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°.