08-03-2018 дата публикации
Номер: US20180066814A1
A glass plate, with a thickness θ of 1.0 mm or more, having first and second main surfaces and end surfaces, includes 1 to 80 weight ppm of iron in terms of FeOwith 0.1 to 10.0 weight ppm of Fe; and 0.1 to 10.0 weight ppm of Ni, Mn, Cr, Co and V in total. In a sample with a size of 50 mm×50 mm×8 obtained from the glass plate, and an arithmetic average roughness of the main surfaces and first and second cut surfaces being 0.1 μm or less, a first average absorbance coefficient for a wavelength of 400 to 700 nm measured on the first main surface in a normal direction is 0.009 or less, and a ratio of a second average absorbance coefficient measured on the first cut surface, to the first absorbance coefficient is 1.3 or less. 1. A glass plate , having a length of a side L of 200 mm or more and a thickness θ of 1.0 mm or more , provided with first and second main surfaces; and one end surface or a plurality of end surfaces connecting the main surfaces to each other , the glass plate comprising:{'sub': 2', '3', '2', '3, 'sup': '2+', '1 weight ppm to 80 weight ppm of iron in a total amount in terms of FeO, with 0.1 weight ppm to 10.0 weight ppm of Fe in terms of FeO; and'}0.1 weight ppm to 10.0 weight ppm of Ni, Mn, Cr, Co and V in total,wherein, in a sample “A”, obtained by cutting from a central portion of the glass plate in a direction orthogonal to the first main surface, with a size having a length of 50 mm, a width of 50 mm and a thickness of θ, the two main surfaces and first and second cut surfaces that face each other being set to have an arithmetic average roughness Ra of 0.1 μm or less,{'sub': 'ave1', 'a first average absorbance coefficient, α, for a wavelength within a range of 400 nm to 700 nm measured on the first main surface in a normal direction to the first main surface is 0.009 or less, and'}{'sub': ave2', 'ave1', 'ave2', 'ave1, 'a ratio of a second average absorbance coefficient, α, for a wavelength within a range of 400 nm to 700 nm measured on the ...
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