公开(公告)号：US20210208376A1

公开(公告)日：2021-07-08

申请号：US17136935

申请日：2020-12-29

Applicant: National Applied Research Laboratories

Inventor： SHENG-FENG LIN ,  CHING-WEI CHEN ,  CHIA-RAY CHEN ,  TIEN-CHUN KUO

IPC: G02B17/08

Abstract: A catadioptric optical system in sequence of ray tracing comprises a first mirrors group of Ritchey-Chrétien type hyperbolic mirrors with positive diopter including a concave primary mirror having a central through hole and a convex secondary mirror, a second corrector lens group with negative diopter positioned at the image-side of the first mirrors group including a first meniscus lens element having positive refractive power and a convex object-side surface, a second lens element having negative refractive power and biconcave surfaces, a third meniscus lens element having negative refractive power and a concave object-side surface, and a fourth lens element having positive refractive power and biconvex surfaces. The infinite conjugate beams of incident light within field of view pass through the catadioptric optical system to become a corrected beam having a small CRA angle.