Abstract: 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 DOL50%/DOLzero is 0.30 or more, where DOL50% (?m) is a depth at which the value of the compressive stress is 50% of the CS and DOLzero (?m) is a depth at which the value of the compressive stress is 0 MPa.

Abstract: To provide a crystallized glass substrate including a surface with a compressive stress layer, in which a stress depth DOLzero of the compressive stress layer, at which the compressive stress is 0 MPa, is 45 to 200 ?m, a compressive stress CS on an outermost surface of the compressive stress layer is 400 to 1400 MPa, and CS×DOLzero, which is a product of the compressive stress CS on the outermost surface and the stress depth DOLzero (?m), is 4.8×104 or more.

Abstract: To provide a crystallized glass substrate including a surface with a compressive stress layer, where a stress depth DOLzero of the compressive stress layer, at which the compressive stress is 0 MPa, is 45 to 200 ?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.

Abstract: 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×DOLzero)/CS×DOLzero is 0.60 or more, where CS (MPa) denotes a compressive stress on an outermost surface of the compressive stress layer, DOLzero (?m) 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 (?m) denotes a thickness of the substrate.

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 ?m in the compressive stress layer is 50.0 to 110.0 MPa/?m, a gradient B of a surface compressive stress from a depth of (a stress depth DOLzero—10 ?m) to the stress depth DOLzero is 2.5 to 15.0 MPa/?m, 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.

Abstract: A safe of the present invention is easily locked or unlocked by the rotational force of a drive motor in accordance with a signal input from the outside of the safe. A locking mechanism is provided within the door. A lock bar is provided with a lock bolt on one end thereof which protrudes from the door and effects locking engagement between the door and the safe body. At ordinary time, the lock bolt is urged to the locking engagement. The drive motor is controlled by a control circuit which receives a safe open/close command signal from the outside. A driving means is revolved by the drive motor and when it engages a drive arm provided on the lock bar, the driving means moves the lock bar against the urging force, thereby releasing the locking engagement of the lock bar.

Abstract: A reflector type fluorescent lamp for use in an optical apparatus, such as a copying machine, has stripe shaped main aperture 3 and narrow stripe shaped sub-aperture 4, wherein the main aperture 3 has no reflective layer 5 and no phsophor layer 6, and the sub-aperture 4 has the phosphor layer 6; the light emitted from main aperture is used to illuminate a document to be copied and another light emitted from the sub-aperture 4 is used to erase electric charge on a photosensitive material drum.