Color cathode ray tube

Details Color cathode ray tube Color cathode ray tube

1998-12-09

2000-05-23

Patel, Nimeshkumar D.

Electric lamp and discharge devices

Cathode ray tube

Envelope

313467, 313461, H01J 2910

Patent

active

060669144

ABSTRACT:
A color cathode ray tube comprises a panel having an effective portion. The outer surface in the effective portion of the panel is substantially flat or forms a slightly curved plane with a small curvature. The inner surface of the panel has a substantially infinite curvature radius in a direction of the longer axis in at least a central portion of the panel and is curved in a direction of the shorter axis. A difference in thickness of the effective portion of the panel between the central portion and the edge portions diagonally apart from each other exceeds 8 mm and does not exceed 20 mm, and the transmittance of the glass in the central portion of the effective portion is at least 70%. The particular construction enables the vacuum envelope of the color cathode ray tube to exhibit a mechanical strength high enough to sufficiently withstand the atmospheric pressure, though the effective portion of the panel is flattened. The vacuum envelope also exhibits a mechanical strength high enough to hold the curved surface of the shadow mask. Further, deterioration of brightness can be prevented in the color cathode ray tube of the present invention.

REFERENCES:
patent: 2728012 (1955-12-01), Swedlund
patent: 4537322 (1985-08-01), Okada et al.
patent: 5216321 (1993-06-01), Kawamura et al.
patent: 5532545 (1996-07-01), Okamoto et al.
patent: 5536995 (1996-07-01), Sugawara et al.
patent: 5663610 (1997-09-01), Inoue et al.
O. Adachi, et al., SID International Symposium Digest of Technical Papers, vol. 22, pp. 37-40, "Super-Flate-Face Large-Size-Screen Color CRT", May 6, 1991.

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