Abstract: A rare earth magnet may include a formed body having magnetic powder containing rare earth metal, the formed body being magnetized, a coating film which is formed on an outer face of the formed body, and a rust preventive treatment layer which is formed on a surface of the magnetic powder in a pore of the formed body. In a manufacturing method for a rare earth magnet, a forming step is performed in which a formed body having magnetic powder containing rare earth metal is formed, after that, a coating film forming step is performed in which a coating film is formed on an outer face of the formed body and, after that, a rust prevention processing step is performed in which rust preventive liquid is impregnated into the formed body.

Abstract: A rare earth magnet may include a formed body having magnetic powder containing rare earth metal, the formed body being magnetized, a coating film which is formed on an outer face of the formed body, and a rust preventive treatment layer which is formed on a surface of the magnetic powder in a pore of the formed body. In a manufacturing method for a rare earth magnet, a forming step is performed in which a formed body having magnetic powder containing rare earth metal is formed, after that, a coating film forming step is performed in which a coating film is formed on an outer face of the formed body and, after that, a rust prevention processing step is performed in which rust preventive liquid is impregnated into the formed body.

Abstract: A rotor shaft may include a base shaft member for structuring the rotor shaft, a lead screw formed on an outer peripheral face of the base shaft member, and a resin film which covers the lead screw. Further, a motor may include a rotor shaft that is formed with a lead screw on a peripheral face of the rotor shaft, and a flank face of the lead screw is coated with a resin film. Also, a motor may include a rotor shaft and a bearing which rotatably supports the rotor shaft, at least a sliding portion of the rotor shaft on the bearing is covered with a resin film. The resin film is preferably an electrodeposited film and may contain solid lubricant, filler and fluid adjustment agent.

Abstract: A bearing device includes a bearing member having a bearing surface and a shaft member having a bearing surface which is relatively rotatably supported by the bearing member in such a manner that the bearing surface of the shaft member is arranged so as to face the bearing surface of bearing member. One of the bearing member and the shaft member is formed of a porous metal sintered body having hollow holes and the hollow holes in the bearing surface of the metal sintered body is filled with a lubricating resin to seal apertures in the bearing surface of the hollow holes by the lubricating resin. Thereby the bearing surface is formed of both a resin surface of the lubricating resin and a metal surface of the metal sintered body.

Abstract: A dynamic pressure bearing device, comprising: a shaft member; a bearing member relatively rotatably supporting the shaft member; a plurality of dynamic pressure generation parts provided on a peripheral face either of the shaft member or the bearing member; and a perfect circle part formed at least on a shaft end side at a region which is axially adjacent to the dynamic pressure generation part on the peripheral face where a protruded part and a recessed part are formed, wherein the dynamic pressure generation parts are respectively formed in a circumferential direction at equal angular intervals and extended in an axial direction so as to form a protruded part which makes a dimension of a minute gap between the shaft member and the bearing member to be the smallest and a recessed part which makes the dimension of the minute gap the largest, and the dimension of the minute gap in the perfect circle part is set to be the same as that in the protruded part.

Abstract: A motor comprises a cylindrical hollow rotary shaft and a rotor member which is fitted over an outer circumference of an axial end of the rotary shaft fixed by a tight fit. A bottom portion is integrally provided to the axial end portion of the rotary shaft, to which the rotor member is fixed, to close an opening at the end portion. The bottom portion has a through hole to interconnect a space inside the rotary shaft with a space outside.

Abstract: A dynamic pressure bearing device, comprising:

Abstract: The bearing apparatus used in the motor comprises a rotary shaft, a cylindrical-shaped radial bearing, and a thrust bearing for supporting the lower end portion of the rotary shaft. The rotary shaft is composed of a pipe made of stainless steel and a resin member for closing the lower end portion of the pipe. A groove for generation of dynamic pressure is not formed in the inner peripheral surface of the radial bearing or in the inner peripheral surface of the rotary shaft either. On the upper end portion of the rotary shaft, there is mounted a fan which, due to the rotation of the rotary shaft, takes in the air into the rotary shaft and, in the peripheral surface of the rotary shaft, there are formed blow-out holes for blowing out the air taken in by the fan from the outer peripheral surface of the rotary shaft.

Abstract: A hydrodynamic bearing apparatus comprises at least a pair of hydrodynamic bearing surfaces that face each other in the radial direction which are formed with an outer circumferential surface of a shaft unit and an inner circumferential surface of a shaft fitting unit relatively and rotatably attached to the shaft unit. Hydrodynamic pressure generating grooves of a predetermined shape are produced on either one of the hydrodynamic bearing surfaces of the shaft unit and shaft fitting unit. A lubricant coating is formed by electrodeposition on either of the hydrodynamic bearing surfaces of the shaft unit and shaft fitting unit. A method for manufacturing a hydrodynamic bearing is also disclosed.

Abstract: A motor with dynamic pressure bearing has a radial dynamic pressure bearing section in which opposing radial dynamic pressure surfaces are formed on a rotor and a stator such that a dynamic pressure is generated in a lubrication fluid between the radial dynamic pressure surfaces to thereby rotatably support the rotor in a radial direction thereof with respect to the stator. The motor has thrust magnets mounted on the rotor and the stator in a manner to oppose to one another for generating a magnetic action to levitate the rotor in an axial direction thereof and rotatably support the rotor in a thrust direction thereof with respect to the stator. A magnetic shield device is provided between the thrust magnets and the radial dynamic pressure bearing section for isolating the radial dynamic pressure bearing section from a leak magnetic flux of the thrust magnets.

Abstract: A hydrodynamic bearing apparatus comprises at least a pair of hydrodynamic bearing surfaces that face each other in the radial direction which are formed with an outer circumferential surface of a shaft unit and an inner circumferential surface of a shaft fitting unit relatively and rotatably attached to the shaft unit. Hydrodynamic pressure generating grooves of a predetermined shape are produced on either one of the hydrodynamic bearing surfaces of the shaft unit and shaft fitting unit. A lubricant coating is formed by electrodeposition on either of the hydrodynamic bearing surfaces of the shaft unit and shaft fitting unit. A method for manufacturing a hydrodynamic bearing is also disclosed.

Abstract: A dynamic-pressure fluid bearing comprises bearing parts formed by a pair of dynamic-pressure surfaces. One of the dynamic-pressure surfaces of the bearing parts is a polyamideimide coating thicker than 3 .mu.m and the other surface is metal. The bearing is particularly applicable to driving motors for polygon mirrors. In addition, a so-called particle removing function is added to one or more of the surfaces of the bearing parts or a position nearby that causes easier removal of dust and other particles accumulated on the parts.

Abstract: A dynamic-pressure fluid bearing comprises bearing parts formed by a pair of dynamic-pressure surfaces. One of the dynamic-pressure surfaces of the bearing parts is a polyamideimide coating thicker than 3 .mu.m and the other surface is metal. The bearing is particularly applicable to driving motors for polygon mirrors.

Abstract: An electrochromic display device uses a metal-phthalocyanine derivative as an electrochromic material at the display electrode side and a metal-phthalocyanine derivative being preliminarily held in a reduced state or a redox material being stable in an oxidized state at the counter electrode side.