Exposure device for color CRT manufacture and a compound correct

Details Exposure device for color CRT manufacture and a compound correct Exposure device for color CRT manufacture and a compound correct

1991-10-18

1992-06-16

Hix, L. T.

Optical: systems and elements

Prism

With reflecting surface

359601, 359741, G03B 4100

Patent

active

051228190

ABSTRACT:
A compound corrective lens for use in light exposure in the manufacture of color CRTs includes plurality of lens elements, each having an elementary surface, formed in combination a compound surface on the exit side of the lens, with steps formed at the boundaries between adjacent lens elements to connect edges of the elementary surfaces of the adjacent lens elements. The surfaces are so arranged that the steps falls from the elementary surface on the inner side closest to the optical axis of the lens) to the elementary surface on the outer side (farthest from the optical axis). With such an arrangement, the adverse effect of the steps covered with a light-absorbing layer is reduced. That is, the effective areas of the elementary surfaces are enlarged, and thus the distortion of the lens surface is suppressed.

REFERENCES:
patent: 3828358 (1974-08-01), Miyaoka

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