METHOD OF MANUFACTURING A COLOUR TELEVISION DISPLAY TUBE HAVING A GAS ABSORBING LAYER; COLOUR TELEVISION DISPLAY TUBE THUS MANUFACTURED, AND GETTERING DEVICE MANUFACTURED SUITABLE FOR SUCH A METHOD

摘要

PHN. 9721 10 A gettering 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 is protected from the influence of moist air at comparatively high temperature by means of a layer of metal provided on the grains of the gas-releasing material. As a result of this the gettering device is suitable for being assembled in a television display tube before the window and the cone of the tube have been sealed together by means of a sealing glass.