Color picture tube manufacturing method

Details Color picture tube manufacturing method Color picture tube manufacturing method

1989-08-28

1992-11-03

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

With assembly or disassembly

445 42, 445 45, H01J 9385, H01J 926

Patent

active

051602873

ABSTRACT:
To improve the conventional manufacturing method for a color picture tube in which (1) the panel with a phosphor screen is provided with a shadow mask and baked, (2) the panel and funnel having the necessary parts mounted in the tube, are sealed with frit glass (3) an electron gun is mounted at the main sealing step, and (4) gases are exhausted from the tube, the invention includes a vacuum treatment step which is further provided to exhaust gases from the tube before the temperature in the tube is reduced to the room temperature after the panel and funnel are sealed with frit glass. The vacuum treatment step after the frit sealing step provides a color picture tube with a long life, in which the amount of remaining moisture in the tube is reduced to less than 1/2 of the conventional one and the gas evolution amount during operation is extremely reduced.

REFERENCES:
patent: 2871086 (1959-01-01), Korner et al.
patent: 3536462 (1970-10-01), Eyster et al.
patent: 3932011 (1976-01-01), Piascinski
patent: 4073558 (1978-02-01), Benda et al.
patent: 4213663 (1980-07-01), Nubani et al.
patent: 4923423 (1990-05-01), Stockdale et al.

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