Asahi Glass Company, Limited

Junichi Miyashita

Masanobu Shirai

Daisuke Kobayashi

Kunio Watanabe

Koji Nakagawa

Yasuo Hayashi

Naoki Okahata

Makoto Fukawa

Shiro Tanii

Kazuhiko Yamanaka

Nobuaki Ikawa

Satoshi Miyasaka

Kuniaki Hiromatsu

Ryosuke Kato

Tomohiro Yonemichi

Hideko Nakada

Toshifumi Nihei

Takeo Endo

A glass sheet has one surface and the other surface facing the one surface in a thickness direction, wherein a fluorine concentration (average fluorine concentration by SIMS at a depth of 1 to 24 &#x3bc;m) in the one surface is higher than that in the other surface. The following expression is satisfied: 0.07&#x2266;&#x394;F/&#x394;HO. &#x394;F (mol %) is a value obtained by subtracting an average fluorine concentration in the surface having the lower fluorine concentration from that in the surface having the higher fluorine concentration, and &#x394;HO (mol %) is an absolute value of a value obtained by subtracting an average HO concentration in the surface having the higher fluorine concentration from that in the surface having the lower fluorine concentration.

Glass sheet capable of being inhibited from warping through chemical strengthening

An area S (m) of a facing surface of each of injectors which faces a glass ribbon is set so as to satisfy: S&#x2266;(0.0116&#xd7;P&#xd7;Cg&#xd7;T)/{&#x3b5;&#xd7;F&#xd7;&#x3c3;(T&#x2212;T)}, wherein P is an output (ton/day) of the glass ribbon; Cg is a specific heat (J/(kg&#xb7;&#xb0; C.)) of the glass; T is an acceptable temperature drop (&#xb0; C.); &#x3b5; is radiation factor; F is a surface-to-surface view factor; &#x3c3; is Boltzmann's constant; Tis a temperature (K) of the glass ribbon represented by K=(T+T)/2 where Tand Tare measured values of the glass ribbon at the inlet and outlet of the injector, respectively; and Tis a temperature (K) of the facing surface of the injector.

Method for manufacturing glass substrate with layered film

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Tokyo, Japan

Junichi Miyashita