Abstract: A potential-difference alleviating member for alleviating and lowering the potential difference, which is an energy difference between a rotating or fixed bearing member and a rotary hub or a fixing frame which are formed of metals of different types, is interposed between the two members so as to prevent the occurrence or advance of potential difference corrosion. Relief portions are respectively provided at a joining interface between a rotary shaft and a thrust plate and a joining interface between a bearing member and the counter plate, and the respective members are welded in the relief portions so as to be integrated.

Abstract: A shaft member 21 the flexible, austenitic stainless steel is cold worked, and in the cold working process, a cold working ratio is increased, whereby a surface of the shaft member 21 is hardened. Therefore, there is no need for a nitriding treatment for the surface hardening. The corrosion proof performance of the passive coating possessed by the stainless steel is kept as intact.

Abstract: A rotor includes a hollow rotor case having a cylindrical portion and flanges on ends of the cylindrical portion, an annular magnet fixed to the inner circumferential surface of the cylindrical portion, and a hub having a central portion from which a rotary shaft extends upright. One of the flanges of the rotor case is fixed to the lower surface of the hub.

Abstract: An apparatus for forming holes includes processing device for providing ultrasonic cleaning process to an inner wall of a hole formed on a work piece, and for providing electrolytic cleaning process to said hole, a cleaning tank for storing a cleaning fluid, which is used as a processing fluid for ultrasonic processing and a processing fluid for electrolytic processing, said work piece being immersed in said cleaning fluid, a horn electrode tool serving as a horn tool for said ultrasonic processing means and an electrode tool for said electrolytic processing means, and support device supporting said horn electrode tool movable forward or backward in relation to said hole formed on said work piece in said cleaning tank.

Abstract: In a double-damper apparatus 1 including a driving portion (2), two frame portions (3 and 4) arranged on both sides of the driving portion, and two open/close members (5 and 6) which are coupled with the driving portion (2) and perform the operation of opening/closing the openings (31 and 41) formed in the frame portions respectively by the driving force of the driving portion, a steps(s) &bgr; is formed between the flat portions (37b and 47b) of the two frame portions (3 and 4). A labyrinth structure is formed between both flat portions (37b and 47b) to prevent leakage of fluid between both fluid channels.

Abstract: A beam scanning apparatus is used for scanning a target region through use of an optical beam. Light emitted from the light source is transformed into a parallel optical beam by a collimator lens. A drive mechanism directly moves the collimator lens along a predetermined travel path reciprocally while the primary optical axis of the light emitted from the light source and the optical axis of the collimator lens are placed in a single plane in order to sweep the optical beam over the target region. A stopper mechanism limits the movement of the collimator lens in order to mitigate load imposed on the drive mechanism for reversing the direction of movement of the collimator lens. The stopper mechanism is provided at least one of the points where the direction of reciprocal movement of the collimator lens is switched from one to the other.

Abstract: A rotor includes a rotor magnet magnetized to have a multiple of magnetic poles. A stator, while confronting with the rotor, includes a rotor driving coil set for generating a rotational torque in the rotor, and a bearing coil set for generating a bearing force having a direction perpendicular to the rotational axis direction of the rotor. The number of magnetic poles of the rotor magnet is eight. The number of coils of the bearing coil set of the stator is six. Displacement sensor is provided for detecting a displacement of the rotor, in a direction perpendicular to the rotational axis of the rotor. The rotor is rotated by the rotor driving coil set. Currents flowing in the bearing coils are controlled in accordance with output of the displacement sensor to hold the rotational axis of the rotor at a predetermined position.

Abstract: A first pair of light-receiving cells and a second pair of light-receiving cells are diagonally arranged to constitute a quadrifid light-receiving cells. A pair of first wiring patterns are respectively connected to the first pair of light-receiving cells for leading out output signals therefrom. A pair of second wiring patterns are respectively connected to the second pair of light-receiving cells for leading out output signals therefrom. The first wiring patterns are arranged adjacent to each other, and the second wiring patterns are arranged adjacent to each other. A third wiring pattern is arranged between the first and second wiring patterns, in which a signal having a different nature from those of the output signals from the light-receiving cells.

Abstract: The refrigerator includes a plurality of rooms separated by partition walls; an air blower to send cooling air cooled by an evaporator into a refrigerator box; a fan motor 65 to drive the air blower; a damper device 50 to adjust an amount of the cooling air of at least one room, of amounts of cooling air flowing into the rooms; and control means 2 and 93 for driving the fan motor 65 without fail just before the baffle of the damper device 50 is opened. The temperature at which the bimetal thermo-switch 2 moves from one terminal 2a to the other terminal 2b, is set lower than the temperature at which the bimetal thermo-switch 93 moves from the closing terminal 93b side to the opening terminal 93a side, and the bimetal thermo-switch 2 is made to move to the other terminal 2b side before the baffle moves from the close-status to the open-status.

Abstract: A magnetic piece 23 is provided in the almost central portion of a magnet 18 in a tracking direction. Therefore, the magnetic piece 23 is attracted to the almost central portion of the magnet 18 by the magnetic attraction of the magnet 18 and is held therein. In addition, when a lens holder 15 is set in a neutral position in a focusing direction, the magnetic pieces 23 are provided in the vicinity of both edge portions in the focusing direction of the magnet 18, respectively. Consequently, the lens holder 15 is held in the balance position of the magnetic attractions for both magnetic pieces 23.

Abstract: When winding an armature coil start S of a winding is entwined around a riser R1, the wire is wound via a riser R4 around a salient pole P1 adjacent to the riser R4 and an opposed salient pole P2 to the salient pole P1 in order and leads from a riser R3 through an opposed riser R6 to an adjacent salient pole P3 and an opposed salient pole P4. Next, it is passed to a riser R5 and is wound around an opposed riser R2, an adjacent salient pole P5, and a salient pole P6, then ends with the riser R4. A varistor 18 is inserted and three electrodes 19 are soldered to the corresponding risers R2, R4, and R6.

Abstract: A spindle motor includes a shaft 6 which is rotatably supported; a rotor casing 7 which is turned together with the shaft 6; and a turn table 9 which is fixedly mounted on one end portion of the shaft 6 and is rotated with a disk 10 mounted thereon. An eccentric member 12 is loosely fitted on the part of the shaft 12 which is located between the rotor casing 7 and the turn table 9. The eccentric member 12 is turned with the rotation of the rotor casing 7. In place of the eccentric member, a ball may be arranged which is rolled around the shaft.

Abstract: A process for producing a polarizing beam splitter includes the steps of: forming a birefringent material layer made of an oriented film of an organic polymeric material on an optically isotropic substrate; applying a first heat treatment to the birefringent material layer to cause a change in color or stabilize its molecular structure; forming a periodic grating on said birefringent material layer defined by alternativly arranging exposed and non-exposed areas by applying a patterned exposure of ultraviolet light on said birefringent material layer; and applying a second heat treatment heat to stabilize said periodic grating at a temperature not higher than that for said first heat treatment after said periodic grating is formed.

Abstract: A light beam scanning device 1 has: a laser unit 4 which is placed at a fixed position; a collimating lens 5 which is placed in front of the laser unit; and a swinging mechanism 6 of the magnetic driving type which laterally swings the collimating lens 5. The rotational angle position of the lens due to the swinging mechanism 6 is detected on the basis of an output of a Hall element 97 which detects the origin of the rotational position of a rotor 92 of the swinging mechanism 6. Based on the detection, the light emitting timing of the laser unit 4 is feedback controlled. The lens 5 is directly swung so as to laterally swing the laser beam. As compared with a device of a prior art which uses a reflector plate or a polygon mirror, the present device can be compactly configured in a miniature size.

Abstract: In a motor having a bearing housing 7 with a hollow portion 23, a radial bearing 9 held in the hollow portion 23, a thrust receiving plate 8 provided at one end of the hollow portion 23, and a rotary shaft 1 which is rotatably supported by the radial bearing 9 in a state that an extreme end thereof is in contact with the thrust receiving plate 8, the bearing housing 7, shaped like a cup, includes a cylindrical portion 21 and a bottom portion 22 defining one end of the cylindrical portion 21, the cylindrical portion 21 and the bottom portion 22 define the hollow portion 23, the radial bearing 9 is firmly held with the inner surface of the cylindrical portion 21, and the thrust receiving plate 8 is supported on the bottom portion 22.

Abstract: A disc chucking mechanism includes a turn table, on which a disc with a center hole is disposed, driven by a rotation/drive mechanism, said turn table having a cylindrical portion to which the center hole of a disc in fit, a first guide protruding radially outwardly of the outer circumferential surface of the cylindrical portion, second and third guides retractably provided at positions angularly spaced approximately 120° from the first guide with respect to the center of rotation of the cylindrical portion, and auxiliary guides provided at mid-positions between the second guide and the first guide and between the third guide and the first guide, a height of a peak point of each auxiliary guide being smaller than a height of a peak point of the first guide when measured from the outer circumferential surface of the cylindrical portion, wherein the distance of each auxiliary guide measured from the outer circumferenial surface of the cylindrical portion in smaller than the distance of the peak point of the

Abstract: A PWM driving circuit for a brushless motor is provided on an insulating film formed on a base board made of metal. Grounding the base board, filter condensers are formed between the base board and wiring patterns in which driving currents for the driving coils flow. The capacitances of the condensers are optimized by adjusting the film thickness of the insulating film or by changing the shapes of the wiring patterns or the like.

Abstract: A rotation detecting device for a brushless motor having: a stator core on which a coil is wound; a driving magnetic pole portion which opposes the stator core, which comprises a plurality of magnetic poles, and which is rotated; an FG magnetized portion which is rotated together with the driving magnetic pole portion and which comprises a plurality of magnetic poles; and an FG pattern which opposes the FG magnetized portion. In the device, relative positions of the stator core, the driving magnet pole portion, the FG magnetized portion, and the FG pattern in the circumferential direction are set so that the minimum point c of a torque ripple of the brushless motor does not coincide with points a and b of an output signal from the FG pattern which function as a trigger for rotation control.

Abstract: In a motor 5 in which a thrust bearing 8 using the magnetic force acting between a stator 40 side and a rotor 20 side and a radial bearing 7 using the dynamic pressure generated between the outer peripheral surface 440 of a fixed shaft 44 and the inner peripheral surface of the center hole 21 of the rotor 20 are formed between the stator 40 and the rotor 20, along the axial direction L of the motor shaft between the outer peripheral surface 440 of the fixed shaft 44 and the inner peripheral surface of the center hole 21 of the rotor 20, an annular clearance 70 for generating dynamic pressure between the outer peripheral surface 440 of the fixed shaft 44 and the inner peripheral surface of the center hole 21 of the rotor 20, an annular air chamber 92 for an air damper which communicates with this clearance, and an annular clearance 91 for the air damper which communicates the chamber with the external portion are formed in this order.

Abstract: When, in the case where card take-in means 3 takes in a magnetic card 10, a magnetic head 4 outputs a predetermined reproducing signal, the magnetic card is taken in; and when the predetermined reproducing signal is not outputted by the magnetic head, the magnetic card take-in operation is stopped. The magnetic head 4 is provided near a card inserting inlet 2, so that, when the card take-in operation is stopped, the rear end 10a of the card 10 is protruded from the card inserting inlet 2.