Glass bulb for a cathode ray and a method of producing the same

Details Glass bulb for a cathode ray and a method of producing the same Glass bulb for a cathode ray and a method of producing the same

1999-04-12

2000-08-29

Patel, Vip

Electric lamp and discharge devices

Cathode ray tube

Envelope

220 21A, H01J 2986

Patent

active

RE0368385

ABSTRACT:
A glass panel 3 for a glass tube for a cathode ray tube has a flat panel face portion 7 and a reduced thickness while maintaining a sufficient strength without increasing a difference of brightness, and with less shrinking deformation due to the cooling and solidification of the glass panel.
Compressive stress layers 20, 21 having a thickness of t.sub.o /10 or more are formed in outer and inner surfaces of the face portion 7 of the glass panel 3 respectively. The relation to the wall thickness t.sub.d of the central portion of the face portion to the wall thickness t.sub.o of a portion near an edge portion on a diagonal line is 1.0.ltoreq.t.sub.d /t.sub.o .ltoreq.1.2. Compressive stress layers 22, 23 are formed in outer and inner surfaces of a skirt portion 6 wherein the compressive stress value of the face portion 7 is larger than the compressive stress value of the skirt portion, and the compressive stress value of the outer surface 20 of the face portion is larger than that of the inner surface 21.

REFERENCES:
patent: 2991591 (1961-07-01), Gabor et al.
patent: 4566893 (1986-01-01), Hopkins
patent: 5357165 (1994-10-01), Shibaoka et al.
patent: 5445285 (1995-08-01), Sugawara et al.
"Physical Chemistry of Glass Surfaces", Shoji Tsuchibashi, (Mar. 3, 1980), published by Kodansha, pp. 253-260.
"Glass Encyclopedia" edited by Sumino Sakuhana, Sep. 20, 1985, published by Asakura Shoten Co., Ltd., pp. 302-309.
"Glass Technology," vol. 19, No. 3, Jun. 1978, pp. 57-58.
"RCA Engineering," vol. 29, No. 5, Sep.-Oct. 1984, pp. 56-62.

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