公开(公告)号：US10788172B2

公开(公告)日：2020-09-29

申请号：US15801540

申请日：2017-11-02

Applicant: AGC Inc.

Inventor： Yusuke Arai ,  Naoya Wada ,  Hiroyuki Hijiya ,  Tetsuya Nakashima

IPC: C03C3/087 ,  F21S2/00 ,  C03C3/095 ,  F21V8/00 ,  C03C3/085

Abstract: 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 Fe2O3 with 0.1 to 10.0 weight ppm of Fe2+; 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×θ 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.

公开(公告)号：US10370286B2

公开(公告)日：2019-08-06

申请号：US14597587

申请日：2015-01-15

Applicant: AGC Inc.

Inventor： Jun Endo ,  Shusaku Akiba ,  Kazutaka Ono ,  Tetsuya Nakashima

IPC: C03C21/00 ,  C03C3/085 ,  C03C3/087 ,  C03C3/091 ,  G02F1/1333

Abstract: To provide glass to be used for chemically tempered glass, of which the strength is less likely to be reduced even when indentations are formed thereon. Glass for chemical tempering, which comprises, as represented by mole percentage based on oxides, from 62 to 68% of SiO2, from 6 to 12% of Al2O3, from 7 to 13% of MgO, from 9 to 17% of Na2O, and from 0 to 7% of K2O, wherein the difference obtained by subtracting the content of Al2O3 from the total content of Na2O and K2O is less than 10%, and when ZrO2 is contained, its content is at most 0.8%. Chemically tempered glass obtained by chemically tempering such glass for chemical tempering. Such chemically tempered glass has a compressive stress layer formed on the glass surface, which has a thickness of at least 30 μm and a surface compressive stress of at least 550 MPa.

公开(公告)号：US10766806B2

公开(公告)日：2020-09-08

申请号：US15945144

申请日：2018-04-04

Applicant: AGC Inc.

Inventor： Eriko Maeda ,  Hiroyuki Hijiya ,  Kensuke Nagai ,  Tetsuya Nakashima ,  Yutaka Kuroiwa

IPC: C03C3/091 ,  C03C3/087 ,  C03C21/00 ,  G11B5/73 ,  C03C3/085 ,  C03C4/20 ,  G11B7/24047 ,  H01F41/14

Abstract: The present invention pertains to a glass for a data storage medium substrate which contains a specific amount of each of SiO2, Al2O3, MgO, CaO, SrO, BaO, Li2O, Na2O, and K2O, in molar percentage based on the oxides, and does not substantially contain B2O3 or ZrO2, wherein the sum of the Li2O, Na2O, and K2O contents (R2O), the molar ratio of the SiO2 content to the Al2O3 content (SiO2/Al2O3), and the molar ratio of the sum of the SiO2 and Al2O3 contents (SiO2+Al2O3) to R2O[(SiO2+Al2O3)/R2O] fall within their specific ranges, formula (1): 90