Optical: systems and elements – Lens – With field curvature shaping
Patent
1995-01-05
1997-05-27
Sugarman, Scott J.
Optical: systems and elements
Lens
With field curvature shaping
359649, G02B 300
Patent
active
056337574
ABSTRACT:
An improved projection lens capable of substantially and advantageously implementing a distinct picture by compensating for a chromatic aberration and a residue aberration, which includes a first lens group, including a lens element convex to a screen and having a relatively weak optical power, for eliminating a spherical surface aberration; a second lens group having positive optical power and cemented with a two side lens element having a positive optical element and a lens element having a negative optical element, which have a different dispersion from each other; a third lens group having a positive optical power on an optical axis and a radius code of a curvature surface toward an upper surface of which has the same radius code as the radius curvature surface of a cathode ray tube; and a fourth lens group having a high optical power toward an upper surface of the screen for compensating for a field dependent aberration.
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Goldstar Co. Ltd.
Schwartz Jordan M.
Sugarman Scott J.
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