Projection lens

Details Projection lens Projection lens

1981-01-28

1982-09-07

Corbin, John K.

350432, 350473, 350477, G02B 304, G02B 912, G02B 934, G02B 2718

Patent

active

043480810

ABSTRACT:
A projection lens for a cathode ray tube comprises three groups. The overall positive power of the lens is provided by the first and second groups. The third group of negative power primarily corrects for Petzval curvature. In one form, the second group comprises a bi-convex element and a positive element. In preferred forms some of the lens surfaces are aspheric.

REFERENCES:
patent: 2440088 (1948-04-01), Grey
patent: 2737849 (1956-03-01), Tiller
patent: 3800085 (1974-03-01), Ambats et al.
patent: 3868173 (1975-02-01), Miles et al.
patent: 3951523 (1976-04-01), Nishimoto
patent: 3998527 (1976-12-01), Ikeda et al.

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