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1. WO2000025340 - CATHODE RAY TUBES WITH REDUCED BROWNING PROPERTIES

Publication Number WO/2000/025340
Publication Date 04.05.2000
International Application No. PCT/US1999/023696
International Filing Date 12.10.1999
Chapter 2 Demand Filed 18.05.2000
IPC
C03C 3/089 2006.01
CCHEMISTRY; METALLURGY
03GLASS; MINERAL OR SLAG WOOL
CCHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
3Glass compositions
04containing silica
076with 40% to 90% silica by weight
089containing boron
C03C 8/02 2006.01
CCHEMISTRY; METALLURGY
03GLASS; MINERAL OR SLAG WOOL
CCHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
8Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
02Frit compositions, i.e. in a powdered or comminuted form
C03C 17/04 2006.01
CCHEMISTRY; METALLURGY
03GLASS; MINERAL OR SLAG WOOL
CCHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
17Surface treatment of glass, e.g. of devitrified glass, not in the form of fibres or filaments, by coating
02with glass
04by fritting glass powder
H01J 29/86 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
29Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/113
86Vessels; Containers; Vacuum locks
CPC
C03C 17/04
CCHEMISTRY; METALLURGY
03GLASS; MINERAL OR SLAG WOOL
CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
17Surface treatment of glass, not in the form of fibres or filaments, by coating
02with glass
04by fritting glass powder
C03C 3/089
CCHEMISTRY; METALLURGY
03GLASS; MINERAL OR SLAG WOOL
CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
3Glass compositions
04containing silica
076with 40% to 90% silica, by weight
089containing boron
C03C 8/02
CCHEMISTRY; METALLURGY
03GLASS; MINERAL OR SLAG WOOL
CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
8Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
02Frit compositions, i.e. in a powdered or comminuted form
H01J 2229/8613
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
2229Details of cathode ray tubes or electron beam tubes
86Vessels and containers
8613Faceplates
H01J 29/863
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
29Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
86Vessels; Containers; Vacuum locks
863Vessels or containers characterised by the material thereof
Applicants
  • INTERNATIONAL LEAD ZINC RESEARCH ORGANIZATION [US]/[US]
Inventors
  • LEHMAN, Richard, L.
Agents
  • CLARK, Richard, S.
Priority Data
09/181,37828.10.1998US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CATHODE RAY TUBES WITH REDUCED BROWNING PROPERTIES
(FR) TUBES CATHODIQUES AVEC PROPRIETES DE BRUNISSEMENT REDUITES
Abstract
(EN)
The present invention provides an inexpensive cathode ray tube envelope which suffers considerably diminished glass browning in comparison with traditional cathode ray tube envelopes. The method of reducing glass browning in cathode ray tubes, and a suitable glass composite and glass composition are also provided. The cathode ray tube envelope of the present invention includes a screen which has an inner and an outer glass layers. The inner layer is made of lead-free glass whereas the outer layer is made of lead-containing glass. In the operational cathode ray tube of the present invention, the electron beams emitted therein, are absorbed by the inner layer without substantial browning, since the inner layer does not contain material that cause browning, and do not penetrate to the lead-containing outer layer. At the same time, the X-rays produced in the cathode ray tube are effectively and efficiently blocked by the lead-containing outer layer. The result is both significant reduction in glass browning and effective X-ray protection.
(FR)
Cette invention se rapporte à une enveloppe de tube cathodique peu coûteuse qui subit un niveau considérablement réduit de brunissement du verre par rapport aux enveloppes de tubes cathodiques traditionnelles. Le procédé permettant de réduire le brunissement du verre dans les tubes cathodiques et une composition de verre et de composite de verre appropriée sont également décrits. Cette enveloppe de tube cathodique comporte un écran ayant des couches de verre interne et externe. La couche interne est faite de verre sans plomb, alors que la couche externe est faite de verre contenant du plomb. Dans un tel tube cathodique en fonctionnement, les faisceaux d'électrons émis sont absorbés par la couche interne sans brunissement sensible, dès lors que la couche interne ne contient pas de matériaux entraînant un brunissement, les faisceaux ne pénétrant pas dans la couche externe contenant du plomb. Simultanément, les rayons X produits dans le tube cathodique sont effectivement et efficacement bloqués par la couche externe contenant du plomb. On obtient ainsi à la fois une réduction notable du brunissement du verre et une protection effective contre les rayons X.
Also published as
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