Cathode-ray tube having a gettering device and gettering device

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

1983-10-28

1986-03-18

Kellogg, Arthur

Electric lamp and discharge devices

Cathode ray tube

Envelope

313558, 313559, 313561, 417 48, 445 55, H01J 2994

Patent

active

045771367

ABSTRACT:
In a cathode-ray tube having a glass envelope portion, a gettering device (18) is urged 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 support member (33). The support member 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 arrangement enables the temperature of the support member at the area where it contacts the wall portion to be kept below 700.degree. C. during the inductive heating of the gettering device, thereby preventing glass damage as a result of a thermal overload of the wall portion.

REFERENCES:
patent: 3768884 (1973-10-01), Porta et al.
patent: 4225805 (1980-07-01), Smithgall et al.
patent: 4535267 (1985-08-01), Martelli et al.

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