Cathode ray tube having amorphous resistive film on internal sur

Details Cathode ray tube having amorphous resistive film on internal sur Cathode ray tube having amorphous resistive film on internal sur

1977-12-29

1981-02-03

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Envelope

H01J 2988, H01J 2994

Patent

active

042491070

ABSTRACT:
An amorphous, resistive thin film is deposited on internal surfaces of portions of a cathode ray tube by the pyrolysis of a liquid mixture of colloidal graphite and a heavy metal resinate to produce a film which is a mixture of graphite and the oxide of the metal. The metal resinate is a combination of tin and antimony resinate. The film is deposited on the tube neck in the region of the G3 and G4 electrodes to impede arcing. The amorphous film is also deposited on the tube funnel in the region extending from the snubber contact locations up to the anode voltage terminal. The pyrolysis of the heavy metal resinate and colloidal graphite results in a film having a resistance ranging from 10.sup.3 to 10.sup.8 ohms point to point. The amorphous film which does not require a binder, has good adhesion and scratch resistance characteristics, thereby reducing conductive particle contamination.

REFERENCES:
patent: 2564707 (1951-08-01), Mochel
patent: 2934736 (1960-04-01), Davis
patent: 3138734 (1964-06-01), Lineweaver
patent: 3295008 (1966-12-01), Gallaro et al.

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