Patent ID: 11926563
Assignee: OHARA INC.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A crystallized glass substrate including a surface with a compressive stress layer,
wherein a gradient A of a surface compressive stress from an outermost surface to a depth of 6 μm in the compressive stress layer is 50.0 to 110.0 MPa/μm,
a gradient B of a surface compressive stress from a depth of (a stress depth DOLzero—10 μm) to the stress depth DOLzero is 2.5 to 15.0 MPa/μm,
where the stress depth DOLzero is a depth of the compressive stress layer at a surface compressive stress of 0 MPa, and
a hardness of the outermost surface at an indentation depth of 20 nm is 7.50 to 9.50 GPa.