Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1995-07-13
1997-09-30
O'Shea, Sandra L.
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313403, 313408, H01J 2980
Patent
active
056729340
ABSTRACT:
A color-cathode ray tube having a shadow mask with improved aperture arrays. The aperture arrays are spaced at appropriate intervals and are curved to suppress local doming of the effective part of the shadow mask and to prevent electron-beam mislanding from occurring on a phosphor screen. The distance between any two adjacent apertures is expressed as: PH(N)=A+BN.sup.2 +CN.sup.4, where PH(N) is the distance between the (N-1)th and Nth arrays and A, B, and C are fourth-degree functions of a Y-coordinate. The apertures along a long side of the effective part of the shadow mask in a section extending for one-fourth of a width of the effective part of the shadow mask from a short side of the effective part of the shadow mask are inclined in an opposite direction to the apertures within the section and located one-third of a height of the effective part of the shadow mask from the long side.
REFERENCES:
patent: 3889145 (1975-06-01), Suzuki et al.
patent: 3947718 (1976-03-01), Van Lent
patent: 4583022 (1986-04-01), Masterton
patent: 4631441 (1986-12-01), Morrell et al.
patent: 4636683 (1987-01-01), Tokita et al.
patent: 4665339 (1987-05-01), Masterton et al.
patent: 4691138 (1987-09-01), Masterton
patent: 4727282 (1988-02-01), Tokita et al.
Fukuda Kumio
Inoue Masatsugu
Murai Takashi
Ohama Shinji
Saotome Ichiro
Kabushiki Kaisha Toshiba
O'Shea Sandra L.
Patidar Jay M.
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