Off-axis three-mirror anastignat having corrector mirror

Details Off-axis three-mirror anastignat having corrector mirror Off-axis three-mirror anastignat having corrector mirror

1995-11-01

1996-08-27

Shafer, Ricky D.

Optical: systems and elements

Compound lens system

With curved reflective imaging element

359366, 359729, 359859, 359861, G02B 510, G02B 1706

Patent

active

055506720

ABSTRACT:
A corrector mirror folds the optical path between the objective and relay portions of a three-mirror anastigmat. The corrector mirror is a non-powered mirror having a nominally flat but higher order aspheric surface. By placing the corrector mirror between the objective portion and an intermediate image formed by the objective portion, the field offset of the anastigmat can be significantly increased. A large field offset makes the off-axis anastigmat ideal for use with an on-axis dewar for infrared imaging applications.

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