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Display screen glass for CRT

A technology for cathode ray tubes and display screens, applied in the direction of cathode ray tubes/electron beam tube shells/containers, etc., which can solve problems such as difficult to obtain images

Inactive Publication Date: 2003-05-14
NIPPON ELECTRIC GLASS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, it is difficult to obtain an image at the edge of two regions

Method used

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  • Display screen glass for CRT
  • Display screen glass for CRT

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Embodiment Construction

[0031] Unless otherwise specified, the term "wt%" below refers to "wt%" based on the total weight of the glass. The phrase "containing X in an amount from 0 wt% to Y wt%" means that X is absent or is higher than 0 wt% and lower than Y wt%.

[0032] According to the present invention, display glass for cathode ray tubes is substantially free of PbO. In particular, the content of PbO is 5000 ppm or less, preferably less than 1000 ppm, more preferably 500 ppm or less based on the total weight of the glass.

[0033] Because the display glass for a cathode ray tube of the present invention contains SrO and BaO in an amount of 7% to 15% by weight and 6% to 14.5% by weight, respectively, wherein the SrO / (SrO+BaO) ratio is 0.35 to 14.5% by weight. 0.70, does not contain PbO, which causes browning, so that the liquid temperature of the glass can be lowered. Therefore, it is possible to predetermine that the absorption coefficient of X-rays at a wavelength of 0.6 Angstroms is 36.0CM ...

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Abstract

Panel glass, for a cathode ray tube, which has an SrO / (SrO+BaO) ratio of from 0.35 to 0.70, an X-ray absorption coefficient of 36.0 cm-1 or more at the wavelength of 0.6 angstrom, wherein Na2O / R2O, K2O / R2O and Li2O / R2O (R2O: Na2O+K2O+Li2O) molar ratios fall within a range surrounded by the points A (0, 0.2, 0.8), B (0.2, 0.2, 0.6), C (0.4, 0.6, 0), D (0.2, 0.8, 0) and E (0, 0.4, 0.6) in the ternary phase diagram as shown in FIG 1.

Description

technical field [0001] This invention relates to display glass for cathode ray tubes used in color television picture tubes, projectors and the like. Background technique [0002] The casing of a cathode ray tube includes a display screen portion where images are displayed, a neck portion where an electron gun is mounted, and a funnel-shaped portion. The funnel part is the connecting part of the display part and the neck. Electron rays emitted from the electron gun hit the fluorescent material on the inner surface of the display screen portion, causing the fluorescent material to emit light to project an image on the display screen. During this process, damped X-rays are generated in the picture tube. When these damped X-rays leak through the kinescope envelope, they can have adverse effects on the human body. Therefore, such envelopes are required to have high absorption of X-rays. [0003] In order to increase the absorption coefficient of glass to X-rays, PbO may be c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C4/08C03C3/078C03C3/085C03C3/087C03C3/095H01J29/86
CPCC03C3/085
Inventor 小森宏师山崎博树
Owner NIPPON ELECTRIC GLASS CO LTD
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