Method of forming an electron reflecting coat on CRT shadow mask

Details Method of forming an electron reflecting coat on CRT shadow mask Method of forming an electron reflecting coat on CRT shadow mask

1989-06-26

1991-01-08

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

4271263, H01J 2907

Patent

active

049831364

ABSTRACT:
A method of forming an electron reflecting layer on a perforated shadow mask in a color cathode ray tube, which method comprises the steps of preparing an aqueous suspension containing water glass and powdered bismuth oxide, applying the suspension by the use of a spraying technique to one of opposite surfaces of the perforated shadow mask which confronts a color electron gun assembly within the color cathode ray tube, thereby to form an electron reflecting coating, and drying the coating to complete the electron reflecting layer. The aqueous suspension is prepared by adding to water both the powdered bismuth oxide of 0.1 to 1.0 .mu.m in average particle size in a quantity within the range of 20 to 45 percent by weight relative to the total weight of the aqueous suspension and the water glass having a solid component within the range of 25 to 30 percent by weight relative to the total weight of the water glass, the amount of the water glass added to the water being within the range of 37.5 to 62.5 percent by weight relative to the amount of the powdered bismuth oxide used.

REFERENCES:
patent: 4442376 (1984-04-01), Van Der Wall et al.
patent: 4810927 (1989-03-01), Watanabe

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