Method for preparing a shadow mask for a color picture tube

Details Method for preparing a shadow mask for a color picture tube Method for preparing a shadow mask for a color picture tube

1989-01-13

1990-10-02

Dees, Jose

Radiation imagery chemistry: process, composition, or product th

Producing cathode-ray tube or element thereof

430323, 430394, 430494, 313402, 445 47, G03C 504

Patent

active

049606590

ABSTRACT:
A method for preparing a shadow mask with a plurality of apertures for a color picture tube from a metal shadow mask sheet includes the step of exposing the entire surface of the photosensitive layers provided on the both surfaces of the metal sheet to an unpatterned light before or after the step of exposing the photosensitive layers to patterned light in order to form resist films.

REFERENCES:
patent: 366462 (1972-05-01), Kaplan
patent: 3409487 (1968-11-01), Fry et al.

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