Method of manufacturing a colour television display tube...

Details Method of manufacturing a colour television display tube... Method of manufacturing a colour television display tube...

H - Electricity

01

J

316/10, 252/21

H01J 7/18 (2006.01) H01J 29/94 (2006.01)

Patent

CA 1164846

PHN. 9749 14 ABSTRACT: The invention relates to a method of manufac- turing a colour television display tube the envelope of which comprises a conical portion and a window portion which are sealed together in a vacuum-tight manner by means of a sealing glass. Before said portions are sealed together, a gettering device is assembled in a place inside the envelope of the tube, for example to the internal magne- tic screening cap or the high-voltage contact. The getter- ing device comprises a source of evaporable gettering metal and at least one gas source of a material releasing gas upon heating. The gas-releasing material consists at least substantially of a nitrided pulverulent ternary alloy of iron, germanium and at least one of the metals chromium and manganese. Such a gas-releasing material can be exposed to moist air of 450°C for at least one hour without any objec- tion, which conditions occur when the window portion and the conical portion are sealed together.

377630

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