Projection lens system

Details Projection lens system Projection lens system

1994-06-21

1996-11-05

Lopez, F. Daniel

Optical: systems and elements

Lens

With field curvature shaping

359708, 359713, 359754, 359755, 359761, G02B 300

Patent

active

055723640

ABSTRACT:
A projection lens system for projecting an enlarged image onto a display screen front an image appearing on a faceplate of a cathode ray tube utilizes at least six lens groups. The first lens group, from an end closest to the display screen, is in a form of a meniscus having a negative power. The second lens group has a weak positive power and a convex surface towards the display screen. The third lens group has a strong positive power. The fourth lens group is bi-convex and has a strong positive power. The fifth lens group has a weak positive power. The sixth lens group has a negative power and a pronounced concave surface away from the display screen. The second and fifth lens groups each are made with plastic lenses with at least aspheric surfaces on one side.

REFERENCES:
patent: 4300817 (1981-11-01), Betensky
patent: 4776681 (1988-10-01), Moskovich
patent: 4801196 (1989-01-01), Betensky
patent: 4989961 (1991-02-01), Yoshioka
patent: 5130850 (1992-07-01), Toide
patent: 5148320 (1992-09-01), Toide
patent: 5237456 (1993-08-01), Yoshioka

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