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US 11,448,865 B2Granted
Imaging optical system
AssigneesTsinghua University, Hon Hai Precision Industry Co., Ltd.
InventorsJun Zhu, Ben-Qi Zhang, Guo-Fan Jin, Shou-Shan Fan
Life of this patent
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Abstract
An imaging optical system includes a primary reflecting mirror, a secondary reflecting mirror, a tertiary reflecting mirror, and an aperture stop. The imaging optical system has a field of view, a focal length of the field of view that is defined as FFL, and an effective aperture of a field of view entrance pupil that is defined as FEPD. The FFL and the FEPD at a central field of view are greater than that at the edge field of views, and the FFL and the FEPD change continuously.
Claims19
An imaging optical system, comprising:
- a primary reflecting mirror;
- a secondary reflecting mirror;
- a tertiary reflecting mirror;
- and
- an aperture stop;
- wherein the imaging optical system has a field of view, a focal length of the field of view defined as FFL, and an effective aperture of a field of view entrance pupil defined as FEPD;
- the FFL and the FEPD at a central field of view are greater than the FFL and the FEPD at the edge field of views, and the FFL and the FEPD change continuously;
- and the secondary reflecting mirror is between an image surface and the primary reflecting mirror.
5 more elements
An imaging optical system, comprising:
- a primary reflecting mirror;
- a secondary reflecting mirror;
- a tertiary reflecting mirror;
- and
- an aperture stop;
- wherein the imaging optical system has a field of view, a focal length of the field of view defined as FFL, and an effective aperture of a field of view entrance pupil defined as FEPD;
- and the FFL and the FEPD at a central field of view are greater than the FFL and the FEPD at the edge field of views, and the FFL and the FEPD change continuously.
4 more elements
Dependencies are inferred from the claim text.