Patent
1984-03-09
1985-10-15
Corbin, John K.
G02B 1708
Patent
active
045470456
ABSTRACT:
This invention provides a high speed catadioptric objective system of F/1.2. The lens system comprises, in accordance with the advance of the light rays, a front or first single lens, a main mirror lens, a counter mirror and a field lens system. The counter mirror is mounted in front of the front lens in order to achieve a short overall length and a good correction of sphero-chromatic aberration. The counter mirror may serve as a focussing element or it may be fixedly mounted to the front lens. The present lens system is distinguished over similar prior art systems by its overall length, which has been reduced by 30 percent, sunshade included. The same type of glass is used for almost all lenses of five preferred embodiments in order to eliminate the secondary spectrum and to enable the objective to be used within a very broad spectral range. An almost perfect correction of aberrations has been achieved with only spherical element faces, thus the systems are suitable when maximum image quality and speed are required. They are useful also for low light level and IR spectral range applications.
REFERENCES:
patent: 3507556 (1970-04-01), Shimizu
patent: 3926505 (1975-12-01), Rayces
patent: 4165151 (1979-08-01), Momiyama
patent: 4188091 (1980-02-01), Fujii
patent: 4456343 (1984-06-01), Canzek
Corbin John K.
Kleeman Werner W.
Sugarman Scott J.
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