Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1995-07-26
1997-07-15
O'Shea, Sandra L.
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313407, 313408, H01J 2980
Patent
active
056476531
ABSTRACT:
The present invention relates to a color cathode-ray tube 10 having an evacuated envelope 11 with an electron gun 26 therein for generating at least one electron beam 28. The envelope 11 further includes a faceplate panel 12 having a luminescent screen 22 with phosphor lines on an interior surface thereof. A uniaxial tension focus mask 25, having a plurality of spaced-apart first metal strands 40, is located adjacent to an effective picture area of the screen. The spacing between the first metal strands 40 defines a plurality of slots 42 substantially parallel to the phosphor lines of the screen. Each of the first metal strands 40, across an effective picture area of the screen, has a substantially continuous first insulator layer 64 on a screen-facing side thereof. A second insulator layer 66 overlies the first insulator layer 64. A plurality of second metal strands 60 are oriented substantially perpendicular to the first metal strands 40 and are bonded thereto by the second insulator layer 66. The first insulating layer 64 has a coefficient of thermal expansion substantially matching, or slightly lower than, that of the first strands 40. The second insulating layer 66 has a coefficient of thermal expansion that is substantially identical to that of the first insulating layer 64.
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Coughlin Jr. Vincent J.
Haynes Mack
Irlbeck Dennis H.
O'Shea Sandra L.
RCA Thomson Licensing Corp.
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