Agc Inc.

Taketoshi Taniguchi

Kazutaka Ono

Jun Akiyama

Yasumasa Kato

Hirofumi Tokunaga

Shunji Inoue

Tetsushi Takiguchi

The present invention relates to an alkali-free glass substrate, in which when two arbitrary sites in one main surface thereof are selected, an absolute value of a difference between a thermal shrinkage ratio in an arbitrary direction at one site and a thermal shrinkage ratio in a direction orthogonal to the arbitrary direction at another site is 2 ppm or less, provided that the thermal shrinkage ratio is calculated by measuring a deformation amount in a measuring direction of the glass substrate between before and after a heat treatment of raising a temperature from normal temperature to 600&#xb0; C. at 100&#xb0; C./hour, holding the glass substrate at 600&#xb0; C. for 80 minutes, and lowering the temperature from 600&#xb0; C. to normal temperature at 100&#xb0; C./hour.

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Tokyo, Japan

Taketoshi Taniguchi