Projection lens systems having reduced spherochromatism

Details Projection lens systems having reduced spherochromatism Projection lens systems having reduced spherochromatism

1993-06-15

1994-07-12

Groody, James J.

Television

Video display

Projection device

359649, 359642, H04N 931

Patent

active

053293630

ABSTRACT:
A projection lens system for projecting an image from a cathode ray tube (CRT) onto a screen is provided. The spherochromatic aberration of the system is reduced through the use of a first lens element which has (i) a positive power on axis and at least one aspheric surface which causes the positive power to become negative in the vicinity of the lens element's clear aperture, and (ii) a high dispersion. The first lens element is preferably composed of styrene.

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The Handbook of Plastic Optics, U.S. Precision Lens, Inc., Cincinnati, Ohio, 1983, pp. 17-29.

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