Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1997-07-23
2000-05-02
Patel, Nimeshkumar D.
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313402, H01J 2950
Patent
active
060576405
ABSTRACT:
There is provided a shadow mask for a cathode ray tube, including a plate having a first surface and a second surface. The plate is formed with at least one line of slots between which bridge portions are formed, each slot being spaced away from adjacent slots by a predetermined pitch P. The bridge portions are defined by a first length at the first surface of the plate and a second length at the second surface of the plate, the first and second lengths being determined so that a factor R is in the range of 5% to 15%, wherein the factor R is defined as a ratio of the smaller of the first and second lengths, to the predetermined pitch P. By setting the factor R in the range of 5% to 15%, it is possible to enhance the mechanical strength of the shadow mask without deterioration of brightness characteristic of the shadow mask.
REFERENCES:
patent: 3707640 (1972-12-01), Lerner
patent: 4751424 (1988-06-01), Tong
patent: 5523647 (1996-06-01), Kawamura et al.
Michihiko INABA, et al., Development of an Invar (Fe-36Ni) Shadow Mask for Color Cathode Ray Tubes, Oct. 18, 1988, pp. 1721-1729.
NEC Corporation
Patel Nimeshkumar D.
Smith Michael J.
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