Projection lens

Details Projection lens Projection lens

1991-04-23

1992-09-15

Arnold, Bruce Y.

Optical: systems and elements

Lens

With field curvature shaping

359713, 359757, G02B 962, G02B 1318

Patent

active

051483203

ABSTRACT:
A projection lens system is for projecting an enlargement, on a display screen, of an image appearing on a faceplate of a cathode ray tube. The system includes six groups. The first group from the screen end is in the form of a positive meniscus. The second group includes a weak positive lens element having a surface convex to the screen. The third group includes a negative lens element. The fourth group includes a bi-convex lens element. The fifth group includes a weak positive element. The sixth group has a negative index of refraction. Each of the second and fifth groups include a plastic lens element that has at least one aspheric surface.

REFERENCES:
patent: 4300817 (1981-11-01), Betensky
patent: 4348081 (1982-09-01), Betensky
patent: 4989961 (1991-02-01), Yoshioka

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