Optical: systems and elements – Compound lens system – With curved reflective imaging element
Patent
1991-04-09
1992-10-06
Henry, Jon W.
Optical: systems and elements
Compound lens system
With curved reflective imaging element
359365, 359565, 359741, G02B 1700, G02B 2744
Patent
active
051537729
ABSTRACT:
In accordance with the present invention, a BOE-corrected, off-axis image forming apparatus is disclosed. The apparatus has a first stage with a primary reflective element disposed to reflect light incident from an entrance pupil of the apparatus and form a real image at an intermediate image plane, and a second stage located off-axis with respect to the first stage. The second stage is defined by a secondary reflective and/or refractive assembly which re-images light from the intermediate image plane to a final image plane. A binary optical element (BOE), which has higher-order optical characteristics for providing aspheric correction but extremely low optical power, is provided in one of the stages for correcting aberrations introduced by the other optical elements in the apparatus. The BOE contributes no more than about 3% of the optical power provided by the stage which contains the BOE.
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Brown Daniel M.
Kathman Alan D.
Henry Jon W.
Toledyne Industries, Inc.
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