Electric lamp and discharge devices – Cathode ray tube – Envelope
Patent
1981-03-23
1983-09-27
Ramsey, Kenneth J.
Electric lamp and discharge devices
Cathode ray tube
Envelope
2521814, 2521816, 445 55, H01J 718
Patent
active
044069723
ABSTRACT:
A method of manufacturing a color television display tube, the envelope of which comprises a conical portion (11) and a window portion (12) which are sealed together in a vacuum-tight manner by means of a sealing glass (18). Before these portions are sealed together, a gettering device (21) is positioned inside the envelope of the tube, for example by attachment to the internal magnetic screening cap (17) or to the high-voltage contact (26). The gettering device (21) comprises a source of evaporable gettering metal and a material releasing gas upon heating. The gas-releasing material (5) is protected from the influence of moist air at comparatively high temperatures by means of a layer of metal (6) provided on the grains of the material (5). As a result of this the gettering device (21) is suitable for being assembled in a television display tube before the window (12) and the cone (11) of the tube have been sealed together by means of a sealing glass (18).
REFERENCES:
patent: 2624450 (1953-01-01), Britten et al.
patent: 2772771 (1956-12-01), Wheldon et al.
patent: 3983440 (1976-09-01), Scott et al.
patent: 4077899 (1978-03-01), van Gils
patent: 4302063 (1981-11-01), Rudy
patent: 4342662 (1982-08-01), Kimura et al.
Kraus Robert J.
Ramsey Kenneth J.
U.S. Philips Corporation
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