B - Operations – Transporting – 05 – D
Patent
B - Operations, Transporting
05
D
117/239
B05D 5/12 (2006.01) H01B 1/18 (2006.01) H01J 9/20 (2006.01) H01J 29/88 (2006.01)
Patent
CA 1060288
ABSTRACT A method of manufacturing an electrically conductive layer on an internal wall portion of a cathode-ray tube and a cathode-ray tube manufactured according to this method. By the addition of from 3 to 30% by weight of sodium carbonate or potassium carbonate to a suspension consisting of a conductive material and a binder, a suspension is obtained which, after having been provided on the said wall portion and dried, provides a layer in which hardly any bubbles have formed during the firing of the cathode-ray tube and which during firing produces no gases which detrimen- tally influence the emission of the cathode. As a result of this, during assembly and operation of the cathode ray tube no separate particles will be formed by crusing the bubbles, and consequently picture defects and breakdowns in the electrode configuration for generating electron beams will be prevented. In addition, it has been found that the cathode is less attacked so that a higher emission during the life of the cathode-ray tube is obtained than when other alkali metal salts are used. -11-
265936
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