Crystallized glass substrate
AssigneeOhara Inc.
InventorsTOSHITAKA YAGI, KOHEI OGASAWARA
Life of this patent
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Abstract
Provided is a crystallized glass substrate including a surface with a compressive stress layer, in which 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.
Claims14
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.
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 100 nm is 8.00 to 9.50 GPa.
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 surface compressive stress CS on the outermost surface of the compressive stress layer is 900.0 to 1200.0 MPa.
Dependencies are inferred from the claim text.