Cathode-ray tube and gettering device

Details Cathode-ray tube and gettering device Cathode-ray tube and gettering device

H - Electricity

01

J

313/110, 313/35.

H01J 29/94 (2006.01)

Patent

CA 1215102

ABSTRACT: In a cathode-ray tube having a glass envelope portion, a gettering device (18) is urges against an internal wall portion of the glass envelope portion (2) by means of a resilient metal strip (19) connected to a component of the tube. The gettering device comprises a getter holder (30) in the form of an annular metal channel which is connected to the resilient metal strip (19) via a metal connection strip (32) and furthermore is kept spaced from the wall portion by a metal supporting construction (33). The supporting construction is formed by a metal supporting arm (33) extending from the metal connection strip (32) which at its free end (34) is curved convexly with respect to the wall portion and contacts the wall portion in an area (35) situated centrally with respect to the annular channel (30). This construction enables the temperature of the supporting construction at the area where it contacts the wall portion to be kept below 700°C during the inductive heating of the gettering device. The occurrence of glass damage as a result of a thermal overload of the wall portion is thus prevented.

440698

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