Abstract: A rivet-shaped electrical contact for relay is used as a movable contact for the relay. The rivet-shaped electrical contact includes a heavy-load contact portion formed of a first silver-oxide type contact material; and a light-load contact portion formed of a second silver-oxide type contact material. The hardness of the first silver-oxide type contact material is set to be higher than that of the second silver-oxide type contact material.

Abstract: A method of manufacturing a composite contact in which a flange section with a large diameter at an end of a base part with a small diameter, the composite contact having: a contact section which is made from silver alloy into an upper-surface part of the flange section; and a leg section which is made from copper alloy by forming a large-diameter part so as to form a lower-surface part of the flange section is made integrally with the base part, having the steps of: a primary-forming process forging a copper-alloy wire and a silver-alloy wire having a smaller diameter than that of the copper-alloy wire in a hole of a forming die in a state of being butted to each other so as to form a primary-formed body including a silver-alloy part and a copper-alloy part so that the wires are bonded with each other.

Abstract: A rivet-shaped electrical contact for relay is used as a movable contact for the relay. The rivet-shaped electrical contact includes a heavy-load contact portion formed of a first silver-oxide type contact material; and a light-load contact portion formed of a second silver-oxide type contact material. The hardness of the first silver-oxide type contact material is set to be higher than that of the second silver-oxide type contact material.

Abstract: Disclosed is an electrical contact having high electrical conductivity for a compact electromagnetic relay including an internally oxidized silver-oxide material which is prepared by subjecting an Ag alloy having a composition consisting essentially of, by weight, 5.1 to 9% Sn, 1.5 to 5% In, and 0.005 to 0.06% Bi, with the balance being Ag and unavoidable impurities, to an internal oxidation treatment and then subjecting to a heat treatment for diffusion, aggregation, and growth of precipitated oxides, wherein the internally oxidized silver-oxide material has a metallographic structure such that coarse grains of composite oxides are dispersed and distributed in an Ag matrix, the coarse grains of composite oxides being formed as a result of coarsening of ultra-fine grains of Sn-based oxides and ultra-fine grains of In-based oxides, which are precipitated by the internal oxidation treatment, by the heat treatment for diffusion, aggregation, and growth of the precipitated oxides.

Abstract: A motor having a rotor in which a rotor magnet is fixed on the outer peripheral surface of a rotor body. The motor is configured so that the support shaft portion is formed of a material having a self-lubricating property, and a first sliding surface of the support shaft portion is supported rotatably. Also, the motor is configured so as to have a metallic motor casing, a rotor provided in the motor casing to drive a motor shaft projecting from the motor casing through a shaft hole in an end wall portion, a stator provided around the rotor in the motor casing to rotationally drive the rotor, a cover member provided to close the other end opening of the motor casing, and a connector body integrally formed of a resin so as to seal the other end opening of the motor casing from the outside of the cover member.

Abstract: A stepping motor is disclosed which is capable of obtaining desired driving torque without sacrificing magnetic properties of a magnet with respect to a stator, reducing inertia mass of a rotor by decreasing a use amount of a magnet material, and thereby, can enhance driving performance including control responsiveness.

Abstract: A first tungsten-based sintered material of the present invention comprises Ni in a range from 0.2 to 1.5% by mass, Y2O3 in a range from 0.1 to 1% by mass, and optionally, (a) VC in a range from 0.05 to 0.5% by mass and/or (b) Co and/or Fe in a range from 0.01 to 5% by mass, the balance being tungsten (W); W phases are sinter-bonded; Ni phase or Ni—Co/Fe alloy phase which has the largest particle diameter of 5 ?m or less and Y2O3 having the largest particle diameter of 5 ?m or less are distributed at boundaries of the W phases; and the largest particle diameter of the W phase is 30 ?m or less. The first tungsten-based sintered material is preferably used for a hot press mold for optical glass lenses.

Abstract: An object of the present invention is to provide a stepping motor capable of reducing the number of components and the number of assembling steps, and its manufacturing method. In order to achieve the object, a stepping motor according to the present invention is constructed to include a bobbin which integrally holds a yoke and a connector housing which is disposed at one end portion in an axial direction of the bobbin and integrally holds a pin for connecting a coil wound around the bobbin to an external conductor, and to integrally form the bobbin and the connector housing of a resin.

Abstract: Disclosed is an electrical contact having high electrical conductivity for a compact electromagnetic relay including an internally oxidized silver-oxide material which is prepared by subjecting an Ag alloy having a composition consisting essentially of, by weight, 5.1 to 9% Sn, 1.5 to 5% In, and 0.005 to 0.06% Bi, with the balance being Ag and unavoidable impurities, to an internal oxidation treatment and then subjecting to a heat treatment for diffusion, aggregation, and growth of precipitated oxides, wherein the internally oxidized silver-oxide material has a metallographic structure such that coarse grains of composite oxides are dispersed and distributed in an Ag matrix, the coarse grains of composite oxides being formed as a result of coarsening of ultra-fine grains of Sn-based oxides and ultra-fine grains of In-based oxides, which are precipitated by the internal oxidation treatment, by the heat treatment for diffusion, aggregation, and growth of the precipitated oxides.

Abstract: There is provided a vibrator which is integrally coupled to a rotating shaft of a motor. A groove portion in which the rotating shaft is fitted is formed in an eccentric load portion, and side walls extending from the eccentric load portion and forming both side edge portions of the groove portion are provided. A portion of a tip portion end surface of each side wall, except at an outer peripheral portion of the side wall and at a side of the groove portion, is caulked from an opening side of the groove portion toward a bottom side thereof, so that the vibrator is integrally coupled to the rotating shaft.