Agc Inc.

Hitomi Furuta

Yusuke Arai

Qing Li

Kazutaka Ono

Akio Koike

Shigeki Sawamura

Takanori Fukushi

The present invention relates to a glass ceramic having a three-dimensional shape including plural R-shapes including a smallest R-shape whose average radius of curvature is 5.0×10mm or less and a largest R-shape whose average radius of curvature is 1.0×10mm or more, having a maximum value of retardations of 20 nm/mm or less, and having a haze value converted into a value corresponding to a thickness of 0.8 mm of 1.0% or less in the largest R-shape.

Crystallized glass, chemically strengthened glass, and production method therefor

A glass sheet, containing, in mass % on an oxide basis: 45-70% of SiO, 1-15% of AlO, 10-25% of LiO, 0-10% of NaO, 0-5% of KO, and 0-15% of ZrO. KO/RO is 0.10 or less and ZrO/RO is 0.30 or more, where RO is a total content of LiO, NaO, and KO. The glass sheet has an average thermal expansion coefficient at 50° C.-350° C. of 90×10/° C.-140×10/° C. and a Young's modulus of 85 GPa or more.

Glass ceramics, chemically strengthened glass, and semiconductor substrate

Growing community of inventors

Tokyo, Japan

Hitomi Furuta