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US 4,733,955 AGranted
Reflective optical triplet having a real entrance pupil
AssigneeHughes Aircraft Company
InventorLacy G. Cook
Life of this patent
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AssigneeHughes Aircraft Company
InventorLacy G. Cook
Estimating the term…
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.
An all-reflecting, non-relayed optical system having means defining at least three mirrors for imaging distant objects, said optical system having an optical axis and an aperture stop, comprising:
An all-reflecting, non-relayed optical system having means defining at least three mirrors for imaging distant objects, said optical system having an optical axis and comprising:
Dependencies are inferred from the claim text.