Glass Article

A glass and article technology, applied in the field of glass articles, can solve the problems of lower product characteristics, longer optical path length, lower brightness, etc.

Inactive Publication Date: 2017-12-01
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When a glass plate is used as a light guide, light absorption inside the glass plate in the visible light region (wavelength 380nm to 780nm) cannot be ignored as the optical path length becomes longer due to the increase in screen size, and a reduction in brightness is expected to occur Or brightness / color unevenness within the plane
In addition, it is also considered that even a small number of bubble defects inside the glass sheet can significantly reduce the product characteristics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0217] Hereinafter, examples of the present invention will be described.

[0218] The raw material of each component was prepared so that it might become a target composition, and it melted at 1350 degreeC for 1 hour using the platinum crucible. When melting, 400 g of raw material was added in 3 times every 20 minutes. Next, the obtained molten liquid was heated up to a predetermined temperature of 1450° C. to 1650° C. over 1 hour, and then left to stand for 3 hours. The melting temperature of this second stage is appropriately selected according to the clarity of the glass. Incidentally, in the glasses of Examples 58 to 66, melting was performed while blowing 1 L / min of oxygen into the atmosphere.

[0219] The molten glass is poured onto a preheated carbon mold and shaped into a plate, which is then slowly cooled.

[0220] It should be noted that the raw materials are selected from silica sand, alumina, sodium carbonate and other commonly used glass raw materials. Moreove...

example 1

[0237] Table 1 and Table 2 show the glass composition (unit: mass %) of Examples 1 to 20, and the content of iron in the glass in terms of Fe 2 o 3 total iron oxide (t-Fe 2 o 3 ) content (unit: ppm), converted into CeO 2 The content of cerium oxide (unit: ppm), iron redox value (Fe-redox), according to the left side of formula 3 (64×[MgO]+100×[CaO]+127×[SrO]+156×[BaO] ) while the calculated parameter B RO (Denoted as B_RO in the table), and shows that for samples of these glasses the high pressure mercury lamp was used at an illuminance of 45mW / cm 2 Transmittance change at wavelength 400nm and optical path length 1mm before and after irradiation for 30 seconds Δ%T@400nm, transmittance (%) at optical path length 5cm at wavelengths 450nm, 520nm, and 700nm, Ce 3+ / C 4+ . In addition, although not described in the table, each glass contains 6.0 ppm of MnO 2 , 0.5ppm NiO, 0.6ppm Cr 2 o 3 .

[0238] In the table, examples 1 to 16 are examples, and examples 17 to 20 are co...

example 2

[0246] Table 3 and Table 4 show the glass composition (unit: mass %) of Examples 21 to 38, and the content of iron in the glass in terms of Fe 2 o 3 total iron oxide (t-Fe 2 o 3 ) content (unit: ppm), converted into CeO 2 The content of cerium oxide (unit: ppm), iron redox value (Fe-redox), according to the left side of formula 3 (64×[MgO]+100×[CaO]+127×[SrO]+156×[BaO] ) while the calculated parameter B RO (Denoted as B_RO in the table), and shows that for samples of these glasses the high pressure mercury lamp was used at an illuminance of 45mW / cm 2 Transmittance change at wavelength 400nm and optical path length 1mm before and after irradiation for 30 seconds Δ%T@400nm, transmittance (%) at optical path length 5cm at wavelengths 450nm, 520nm, and 700nm, Ce 3+ / C 4+ . In addition, although not described in the table, each glass contains 6.0 ppm of MnO 2 , 0.5ppm NiO, 0.6ppm Cr 2 o 3 .

[0247] In the table, examples 21 to 37 are examples, and example 38 is a compar...

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Abstract

Provided is a glass article which has a high transmittance and in which the glass is inhibited from suffering coloration or solarization. The glass article is constituted of a glass which comprises, in terms of oxide amount in percent by mass or mass ppm, 50-80% SiO2, 0-10% K2O, 1-145 mass ppm total iron oxide (t-Fe2O3) in terms of Fe2O3, 0-30 ppm divalent iron (Fe2+) in terms of Fe2O3, 1-1,000 ppm total cerium oxide (t-CeO2) in terms of CeO2, and 1-35% at least one alkaline-earth metal oxide selected from the group consisting of MgO, CaO, SrO, and BaO, the glass having an iron redox, which is shown by expression (1), of 0-30% and satisfying expressions (2) and (3). (Content of divalent iron (Fe2+) in terms of Fe2O3) / [total content of divalent iron (Fe2+) in terms of Fe2O3 and trivalent iron (Fe3+) (Fe2++Fe3+)] expression (1) 1<=[t-CeO2] / [t-Fe2O3]<=45 expression (2) (64*[MgO]+100*[CaO]+127*[SrO]+156*[BaO])>=1200 expression (3).

Description

technical field [0001] The present invention relates to solarization-suppressed, colored glass articles having high transmittance in the visible light region. Background technique [0002] Acrylic resin plates are widely used in edge-lit planar light-emitting devices, such as light guide units of liquid crystal televisions, but studies are underway to replace them with glass plates from the viewpoint of rigidity, heat resistance, and water resistance. [0003] When a glass plate is used as a light guide, light absorption inside the glass plate in the visible light region (wavelength 380nm to 780nm) cannot be ignored as the optical path length becomes longer due to the increase in screen size, and a reduction in brightness is expected to occur Or brightness / color unevenness within the plane. In addition, it is also considered that even a small amount of bubble defects inside the glass sheet can significantly reduce product characteristics. [0004] Irrespective of the above...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/085C03C3/087
Inventor 稻叶诚二荒井雄介土屋博之
Owner ASAHI GLASS CO LTD
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