Optical imaging system
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United States of America Patent
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Sep 12, 2000
Grant Date -
N/A
app pub date -
May 21, 1998
filing date -
Jun 2, 1997
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Abstract
A two-stage optical imaging system which is capable of operating in the infra red and which is compact, the system comprising an objective generally in the form of a Cassegrain system with primary and secondary mirrors A, B together with a relay C which may be reflective, refractive or refractive and diffractive, the relay C being located co-axially between the primary and secondary mirrors A, B.
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