Ohara, Inc.

Reika Kojima

Naoyuki Goto

Toshitaka Yagi

Yutaka Yamashita

Kohei Ogasawara

Yuki Motoshima

To provide a crystallized glass substrate including a surface with a compressive stress layer, where a stress depth DOLof the compressive stress layer, at which the compressive stress is 0 MPa, is 45 to 200 μm, a compressive stress CS on an outermost surface of the compressive stress layer is 400 to 1400 MPa, and a central stress CT determined by using curve analysis is 55 to 300 MPa.

Crystallized glass substrate

To provide a crystallized glass substrate including a surface with a compressive stress layer, in which a stress depth DOLof the compressive stress layer, at which the compressive stress is 0 MPa, is 45 to 200 μm, a compressive stress CS on an outermost surface of the compressive stress layer is 400 to 1400 MPa, and CS×DOL, which is a product of the compressive stress CS on the outermost surface and the stress depth DOL(μm), is 4.8×10or more.

To provide a crystallized glass substrate including a surface with a compressive stress layer, in which a compressive stress CS (MPa) on an outermost surface of the compressive stress layer is 400 to 1400 MPa, and DOL/DOLis 0.30 or more, where DOL(μm) is a depth at which the value of the compressive stress is 50% of the CS and DOL(μm) is a depth at which the value of the compressive stress is 0 MPa.

To provide a crystallized glass substrate including a surface with a compressive stress layer, in which, CS is 400 to 1400 MPa and CT×(T−2×DOL)/CS×DOLis 0.60 or more, where CS (MPa) denotes a compressive stress on an outermost surface of the compressive stress layer, DOL(μm) denotes a stress depth of the compressive stress layer at which the compressive stress is 0 MPa, CT (MPa) denotes a central stress determined by curve analysis, and T (μm) denotes a thickness of the substrate.

To provide a crystallized glass substrate including a surface with a compressive stress layer, in which a stress depth DOLof the compressive stress layer, at which the compressive stress is 0 MPa, is 45 to 200 &#x3bc;m, a compressive stress CS on an outermost surface of the compressive stress layer is 400 to 1400 MPa, and CS&#xd7;DOL, which is a product of the compressive stress CS on the outermost surface and the stress depth DOL(&#x3bc;m), is 4.8&#xd7;10or more.

To provide a crystallized glass substrate including a surface with a compressive stress layer, where a stress depth DOLof the compressive stress layer, at which the compressive stress is 0 MPa, is 45 to 200 &#x3bc;m, a compressive stress CS on an outermost surface of the compressive stress layer is 400 to 1400 MPa, and a central stress CT determined by using curve analysis is 55 to 300 MPa.

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Kanagawa, Japan

Reika Kojima