Reflective optical triplet having a real entrance pupil
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United States of America Patent
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-
Mar 29, 1988
Grant Date -
N/A
app pub date -
Apr 14, 1986
filing date -
Apr 14, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A non-relayed optical system is used off-axis in both aperture and field angle relative to an optical axis (32), and employs three reflective lens elements (34, 36, 38). The system is useful for viewing radiation from a distant object, the radiation allowed to enter the system through an opening in a real and accessible entrance pupil (44) that is disposed in front of a concave primary mirror (34). Because the entrance pupil of the system is real and not virtual, the aperture stop of the system is coincident with the entrance pupil, resulting in a significant reduction in beam wander about the front of the optical system. The real entrance pupil of the system also allows the system to be utilized for applications where it is required that the system view distant objects by means of a small viewing port, window or object space scan mirror.
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