Optical: systems and elements – Compound lens system – With curved reflective imaging element
Patent
1997-02-24
1999-11-30
Nguyen, Thong
Optical: systems and elements
Compound lens system
With curved reflective imaging element
359365, 359729, G02B 1700
Patent
active
059952806
ABSTRACT:
A lens system particularly suitable for low light, high speed applications has a primary mirror (31, 51) having a spherical reflecting surface and a secondary mirror (37, 52) having a spherical reflecting surface arranged to receive light reflected from the primary mirror. Both mirrors have the same center of curvature. The lens system includes image relay lens (47, 56) and a transfer lens (35, 55) arranged to image the center of curvature to a location at the center of the aperture stop (43, 57) of the image relay lens. This relay lens may include a spherical mirror located so that its center of curvature is coincident with the center of the aperture stop, thus creating a singular optical center of curvature for the whole lens system. The relay lens may include a meniscus corrector lens (33, 41, 42) which is located close to the aperture stop and which is also concentric with the common center of curvature. The size of the meniscus corrector lens is much smaller than the diameter of the lens system as a whole, conferring significant advantages of costs and ease of fabrication.
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Her Majesty the Queen in right of New Zealand
Nguyen Thong
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