Correcting lens having two effective surfaces

Details Correcting lens having two effective surfaces Correcting lens having two effective surfaces

1974-04-05

1977-07-26

Corbin, John K.

350211, 350213, 354 1, G02B 302, G03B 4100

Patent

active

040379361

ABSTRACT:
A correcting lens for use in the formation of a color picture tube screen has a first effective surface comprised of a plurality of elements separated by boundaries of discontinuity. Each of the elements in the first effective surface is separately contoured to reduce misregister in the tube. The second effective surface, opposite the first, is contoured to additionally reduce misregister in the tube.

REFERENCES:
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patent: 2999126 (1961-09-01), Harries et al.
patent: 3177397 (1965-04-01), Keeran
patent: 3385184 (1968-05-01), Ramberg et al.
patent: 3495511 (1970-02-01), Javorik
patent: 3628850 (1971-12-01), Yamazaki et al.
patent: 3738234 (1973-06-01), Barten et al.

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