Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1992-06-15
1994-11-29
Yusko, Donald J.
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313269, 313399, H01J 118
Patent
active
053693302
ABSTRACT:
A mask structure of a color picture tube includes a number of grid wires stretched over a frame in the same direction and separated from one another, and a damp wire stretched to traverse the number of grid wires in contact with the number of grid wires. The damp wire is formed of a tungsten core wire coated with a secondary emission semiconductor material layer. Thus, art asymmetrical electron lens is formed by a potential difference generated between the grid wire and the damp wire, so that an electron beam having passed through a spacing between the grid wires is deflected in a converging direction. Therefore, the electron beam is guided onto a zone of a phosphor screen shaded by the damp wire. Accordingly, a black line, which would otherwise appear because the electron beam is shielded by the damp wire, becomes inconspicuous. Namely, the display quality is elevated.
REFERENCES:
patent: 2757303 (1956-07-01), Silverman
patent: 2913613 (1959-11-01), Evans
patent: 3638063 (1972-01-01), Tachikawa et al.
patent: 4495437 (1985-01-01), Kume et al.
patent: 4504764 (1985-03-01), Sakamoto et al.
patent: 4780641 (1988-10-01), Hashiba et al.
patent: 5172027 (1992-12-01), Nonomura et al.
patent: 5227691 (1993-07-01), Murai et al.
NEC Corporation
Patel Vip
Yusko Donald J.
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