Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis; from 50.5 to 52.5 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 4 to 10.6 wt % of TiO2.

Abstract: The electrical equipment of the present invention is operated such that the ON operating member for the primary power supply supplying circuit is manually operated, the switch device S is turned ON and when a supplying of electrical power for the primary power supply supplying circuit is shut off, the circuit for the control system is operated and upon performing a predetermined security processing, the driving source is driven, the OFF operating member is automatically operated, the switch device S is automatically turned OFF and supplying of an electrical power to the primary power supply supplying circuit is automatically shut off, so that it is possible to perform an appropriate processing before shutting off the primary power supply supplying circuit and thus it is also possible to provide electrical equipment showing a high safety characteristic.

Abstract: A substrate satisfies following conditional formulas (1) and (2):

Abstract: In a switch device, a support arm is retained by a conductor plate at one of its ends and by a center terminal at its other end The spring member, which made of an elastic round wire, is placed in a bent form between the conductor plate and the center terminal so as to movably support the conductor plate on the center terminal. The support arm and the spring member are retained by the conductor plate and the center terminal on arc-shaped surfaces.

Abstract: The present invention provides electronic equipment that can shut off and supply power to a primary power supplying circuit by automatic operations, directly shut off power to the primary power supplying circuit by easy manual operations based on the operator's will, and never fails to zero power consumption of the primary power supplying circuit during no use.

Abstract: In a switch device, a support arm is retained by a conductor plate at one of its ends and by a center terminal at its other end. The spring member, which made of an elastic round wire, is placed in a bent form between the conductor plate and the center terminal so as to movably support the conductor plate on the center terminal. The support arm and the spring member are retained by the conductor plate and the center terminal on arc-shaped surfaces.

Abstract: A switch device includes a first case and a second case. Stationary contacts are enclosed within the first case that is sealed by a cover. An operating lever configured to actuate a movable contact is partially received by a window hole within the cover. An engaging hook is unitary part of or is coupled to the outside surface of the second case. Stationary terminals project from the stationary contacts. The second case encloses the first case and the cover. The first case and the cover are made of resins having an arc resistance. The second case is made of a thermoplastic resin that is more flexible than the first case.

Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.

Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.

Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.

Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.

Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.

Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.

Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.

Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.

Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.

Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.

Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.

Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.

Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.