Method of manufacturing cathode-ray tube

Details Method of manufacturing cathode-ray tube Method of manufacturing cathode-ray tube

1998-12-21

2000-08-15

Bell, Janyce

Coating processes

Electrical product produced

Fluorescent or phosphorescent base coating

427 64, 427 68, 427240, B05D 512

Patent

active

061032972

ABSTRACT:
A method of manufacturing a cathode-ray tube comprises a process of forming a phosphor screen. The process comprises an application process, a shake-off process, and a drying process. In the application process, a glass panel is tilted with respect to a vertical axis and is rotated having a tilt axis as a central axis to spread a phosphor slurry over almost the entire area of an inner face of the glass panel. In the shake-off process, by rotating the glass panel, excess phosphor slurry is shaken off, and the excess phosphor slurry is recovered in phosphor-slurry recovery members provided at the four corners of the glass panel. In the drying process, the phosphor slurry is dried. In this method, the tilt angle and rotation speed of the glass panel at least in one process out of the application process, the shake-off process, and the drying process is changed at least in two stages. Thus, using large phosphor particles capable of obtaining a high luminance, a cathode-ray tube in which a phosphor screen, with uniform distribution of the phosphors and without a cross phenomenon, wall stain, and liquid spill onto the inner face, is formed on an inner face of a glass panel can be obtained.

REFERENCES:
patent: 3653941 (1972-04-01), Bell et al.
patent: 4078095 (1978-03-01), Ratay
patent: 4254160 (1981-03-01), Raih
Derwent Publications Ltd., Section Ch, Week 9306, Class L03, AN 93-050954 & KR 9 203 963 (Samsung Electron Devices), May 18, 1992.

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