1984-08-21
1987-10-06
Corbin, John K.
350412, 350469, 350473, G02B 1318, G02B 934
Patent
active
046978925
ABSTRACT:
A projection lens for a cathode ray tube display which comprises from the image end, a first group of relatively weak optical power serving primarily to correct aperture dependent aberrations, a second group of strong positive power, and a third negative group having a strongly concave image side surface and which serves as a field flattener and to correct the Petzval curvature of the services of the elements of the other groups. The second group comprises two elements which provide substantially all of the positive power of the lens and which define an air meniscus therebetween with the minor dimension at the optical axis. The optical powers of the second group bear a predetermined ratio and have a minor dimension at the optical axis.
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Cox; A System of Optical Design; Focal Press; 1965; pp. 470-482.
Corbin John K.
Sugarman Scott J.
U.S. Precision Lens Inc.
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