Optical: systems and elements – Compound lens system – With curved reflective imaging element
Reexamination Certificate
2005-05-03
2005-05-03
Nguyen, Thong Q. (Department: 2872)
Optical: systems and elements
Compound lens system
With curved reflective imaging element
C359S389000, C359S637000, C359S744000
Reexamination Certificate
active
06888672
ABSTRACT:
A compact reflector telescope has a spherical primary reflector and a secondary reflector with a negative lens interposed there between in axial alignment therewith. Light reflected from the primary reflector is passed through the negative lens and is diverted by the secondary reflector to a positive lens at the side of the telescope tube. The positive lens focuses the light rays onto an eye piece or ocular or onto a photographic emulsion or electronic detector. The telescope reduces or substantially eliminates spherical aberration and can be configured to have a focal ratio significantly greater than the focal ratio of the primary reflector. The telescope produces a flat field of view and an image which is substantially diffraction limited.
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Cape Instruments Ltd.
Nguyen Thong Q.
Oliff & Berridg,e PLC
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