Method of selecting television display tubes in which the vacuum

Details Method of selecting television display tubes in which the vacuum Method of selecting television display tubes in which the vacuum

1990-10-18

1992-01-28

Seidel, Richard K.

Electric lamp or space discharge component or device manufacturi

Process

With testing or adjusting

445 6, H01J 942

Patent

active

050839578

ABSTRACT:
So as to detect and remove tubes having too low a vacuum before gettering, a d.c. voltage which continuously increases from a low value to a maximum value is applied between the anode (g4) and a second electrode (g3) of a television display tube, the increase in this voltage being stopped as soon as a spark discharge current flows in the tube. The associated value of the d.c. voltage is evaluated as a criterion for the selection of the tubes.

REFERENCES:
patent: 4720652 (1988-01-01), Dubois, Jr.

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