Patent ID: 11926559
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 stress depth DOLzero of the compressive stress layer is 45 to 200 μm, the stress depth DOLzero being a depth at which the compressive stress is 0 MPa,
a compressive stress CS on an outermost surface of the compressive stress layer is 400 to 1400 MPa,
CS×DOLzero, which is a product of the compressive stress CS on the outermost surface and the stress depth DOLzero(μm), is 4.8×104 or more, and
the crystallized glass substrate comprises, by wt % in terms of oxide:
5.0% or more of a Na2O component; and
2.0% or more of a TiO2 component.