Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1968-07-01
1977-01-11
Segal, Robert
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313408, H01J 2907, H01J 3120
Patent
active
040029417
ABSTRACT:
A rectangular multi-apertured shadow mask electrode having a rectangular peripheral reinforcing frame of L shaped cross section is mounted within the rectangular envelope of a color cathode ray tube adjacent to the faceplate with a spacing gap between the frame and the side wall of the envelope. An electron shield of thin metal (e.g. Al) foil extends around and across the spacing gap to prevent scattering of beam electrons during overscan of the mask. The shield comprises an inner flange attached to one flange of the frame by means of tabs and an outer flange pressed against the side wall of the envelope. At each corner, the shield includes a portion of U-shaped cross-section disposed within the spacing gap with the sides of the U resiliently engaging the envelope side wall and the other flange of the frame.
REFERENCES:
patent: 2762942 (1956-09-01), Palmer
patent: 2806165 (1957-09-01), Law
patent: 2906904 (1959-09-01), Woughter et al.
patent: 2951179 (1960-08-01), Evans
patent: 3005921 (1961-10-01), Godfrey
patent: 3183388 (1965-05-01), Townsend et al.
patent: 3304455 (1967-02-01), Mesta
patent: 3358170 (1967-12-01), Fiore
patent: 3377493 (1968-04-01), Levin et al.
patent: 3404303 (1968-10-01), Levin
patent: 3588567 (1971-06-01), Maclean
Bruestle Glenn H.
Irlbeck Dennis H.
RCA Corporation
Segal Robert
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