1986-08-22
1988-10-11
Corbin, John K.
350412, 350464, 350465, 350469, G02B 1318, G02B 934, G02B 960, G02B 962
Patent
active
047766816
ABSTRACT:
A projection lens for a cathode ray tube consisting from the image end of a first lens unit including an element of overall meniscus shape and of positive power at the optical axis, a second lens unit which includes of a biconvex element and supplies the majority of the positive optical power of the lens, the biconvex element being of glass and having spheric surfaces, a third lens unit adjacent the cathode ray tube having a strongly concave image side surface and serving as a field flattener, and a corrector lens unit having at least one aspheric surface, the corrector unit being axially spaced from the second lens unit a distance such that the axial marginal rays from the second lens unit, as traced from the long cojugate intersect the image side surface of the corrector unit at a height from the optical axis that is less than the clear aperture of said corrector lens unit. The corrector lens unit is shaped to correct for off-axis aberrations above the intersection. The first lens unit is of a positive power which will converge rays as traced from the long conjugate and thereby reduce the diameter of the second lens unit.
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Printed Publication--Diagram of a Lens Entitled, Advent Lens Mod II.
Printed Publication--pp. 470-482 of a Volume Entitled, A System of Optical Design, by Cox.
Corbin John K.
Sugarman Scott J.
U.S. Precision Lens Incorporated
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