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CRT bulb glass containing pbo and fe2o3

a technology of fe2o3 and glass, which is applied in the field of crt bulb glass containing pbo, can solve the problems of environmental pollution, inability to obtain a sufficient x-ray absorption, and the possibility of pbo in the glass to dissolve or be leached,

Inactive Publication Date: 2002-08-15
NIPPON ELECTRIC GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PbO contained in the glass may possibly dissolve out or be leached in water such as rain, moisture in the atmosphere and / or in the ground during a long period of time.
It is a great concern that the lead leached would unfavorably result in environmental pollution.
However, if PbO is decreased by more than a predetermined amount, it is impossible to obtain a sufficient X-ray absorptivity.
In this approach, however, a liquid-phase temperature of the glass increases so that the glass tends to be devitrified, resulting in a difficulty in shaping the glass.

Method used

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Examples

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examples

[0025] Now, description will be made in detail about a CRT bulb glass according to the present invention with reference to examples and comparative examples.

[0026] Table 1 shows examples of the present invention (samples Nos. 1-5) and a comparative example (sample No. 6). Each of these samples is a material suitable for a neck glass.

[0027] Table 2 shows examples of the present invention (samples Nos. 7-11) and a comparative example (sample No. 12). Each of these samples is a material suitable for a funnel glass.

1TABLE 1 (weight %) 1 2 3 4 5 6 SiO.sub.2 45.7 42.6 49.1 45.5 52.5 47.35 Al.sub.2O.sub.3 2.8 2.0 0.5 3.4 1.4 2.9 PbO 33.0 35.0 28.0 31.0 28.0 33.5 MgO -- 0.5 -- 1.0 -- --CaO 1.6 2.5 -- 1.3 0.1 1.3 SrO 1.9 --5.5 2.0 2.4 2.1 BaO -- -- 0.5 2.0 1.8 --Na.sub.2O 2.6 1.2 0.5 3.0 0.8 2.6 K.sub.2O 10.0 11.0 12.5 9.0 12.0 9.8 Sb.sub.2O.sub.3 0.4 0.2 0.4 0.3 0.5 0.4 Fe.sub.2O.sub.3 2.0 5.0 3.0 1.5 0.5 0.05 Coefficient of 101.1 105.0 95.1 97.0 89.8 101.8 X-ray absorption (cm.sup.-1) Lead...

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Abstract

In an X-ray absorbing CRT bulb glass containing 10-40 weight % PbO and having an absorption coefficient not smaller than 40 cm-1 with respect to an X-ray having a wavelength of 0.6 angstrom, the glass contains 0.06-10 weight % Fe2O3 to thereby suppress lead from leaching into water in the atmosphere or in the ground where the CRT is wasted and dumped, so as to avoid the environmental pollution by the lead leached in the ground.

Description

INDUSTRIAL APPLICATION FIELD[0001] The present invention relates to a CRT (cathode-ray tube) bulb glass containing PbO for X-ray absorption and, in particular, to such an X-ray absorbing glass which is useful for a funnel part or a neck part of a color CRT bulb.PRIOR ART[0002] A CRT bulb comprises a panel part having an inner surface for forming a fluorescent screen thereon, a neck part for supporting an electron gun therein, a funnel part connecting the panel part and the neck part, and a stem sealing an end portion of the neck part. These parts are made of glass having properties individually adaptable thereto.[0003] In operation of the CRT, the electron gun emits an electron beam which, in turn, produces, upon impinging onto the fluorescent screen, a visible light together with X-ray radiation. The X-ray radiation is harmful for human body and must be reduced to an acceptable level.[0004] To this end, a conventional CRT bulb is usually made of glass having a high X-ray absorptivi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C03C3/102C03C3/105C03C4/08H01J29/86
CPCC03C3/102C03C3/105C03C4/087H01J29/863C03C3/087
Inventor KOMORI, HIROSHI
Owner NIPPON ELECTRIC GLASS CO LTD