Cathode-ray tube and cathode unit for such a cathode- ray tube

Details Cathode-ray tube and cathode unit for such a cathode- ray tube Cathode-ray tube and cathode unit for such a cathode- ray tube

H - Electricity

01

J

313/35.33

H01J 29/04 (2006.01) H01J 1/22 (2006.01) H01J 29/48 (2006.01)

Patent

CA 1192254

ABSTRACT : A cathode filament which consists of a thin metal wire wound into a helical spiral is welded with its two ends to connection braces by means of a highly energetic beam, for example a laser beam. By giving, near the con- nection braces, at least one of the turns of each of the two ends of the spiral of a number of cathodes a larger pitch, cathodes are obtained having filaments the resis- tances of which mutually differ less than 1%. These cathode units are intended to be used in cathode-ray tubes.

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