Glass substrate and method for manufacturing same
A glass substrate includes: a first major surface; a second major surface that is opposite to the first major surface; an end surface interposed between the first major surface and the second major surface; a first boundary surface that is interposed between the first major surface and the end surface and connected to the end surface; and a second boundary surface that is connected to the first major surface and the first boundary surface. The second boundary surface is a convex curved surface, and the second boundary surface has a radius of curvature R 2 of 0.1 mm or larger and 2.0 mm or smaller.
1. A glass substrate comprising:
a first major surface;
a second major surface that is opposite to the first major surface;
an end surface interposed between the first major surface and the second major surface;
a first boundary surface that is interposed between the first major surface and the end surface and connected to the end surface; and
a second boundary surface that is connected to the first major surface and the first boundary surface,
wherein the second boundary surface is a convex curved surface,
the second boundary surface has a radius of curvature R 2 of 0.3 mm or larger and 2.0 mm or smaller,
a chip size in the second boundary surface is 0.08 mm or smaller, and
an angle θ 1 formed by the second boundary surface and the first major surface is 15° or larger and 45° or smaller.
2. The glass substrate according to claim 1 ,
wherein the first boundary surface is a convex curved surface, and
the first boundary surface has a radius of curvature R 1 of 0.1 mm or larger and 1.0 mm or smaller.
3. The glass substrate according to claim 2 ,
wherein the radius of curvature R 2 of the second boundary surface is larger than the radius of curvature R 1 of the first boundary surface.
4. The glass substrate according to claim 1 , comprising a bent portion where the first major surface and the second major surface are bent.
5. The glass substrate according to claim 1 ,
wherein a difference between a distance L 1 from the end surface to the first major surface and a distance L 2 from the end surface to the second major surface is 0.2 mm or smaller.
6. The glass substrate according to claim 1 , wherein the glass substrate is used as a cover glass of a display device.
7. The glass substrate according to claim 6 , wherein the display device is an in-vehicle display device.
8. The glass substrate according to claim 1 , wherein the radius of curvature R 2 of the second boundary surface is larger than a radius of curvature R 1 of the first boundary surface.
9. A method for manufacturing the glass substrate according to claim 1 , comprising:
preparing a glass plate; and
grinding the glass plate using a rotary whetstone,
wherein the rotary whetstone has a grinding surface that is shaped so as to conform to shapes of the first boundary surface and the second boundary surface.