Abstract: Provided is a variable capacitance element comprising a plurality of single capacitance elements that each include (i) a fixed electrode provided on a surface of a substrate, (ii) a floating electrode provided to be separate from the fixed electrode and facing the fixed electrode, and (iii) an actuator that moves the floating electrode closer to or farther from the fixed electrode; and a floating electrode driving section that supplies the actuators with drive power to move the floating electrodes, such that a combined capacitance of the plurality of single capacitance elements becomes a prescribed capacitance.

Abstract: A YIG device comprises a resonator including a YIG element 16 of a single crystalline yttrium iron garnet having a part of yttrium substituted with gadolinium, which is formed in a spherical shape, and magnetic field applying means 20 for applying a magnetic field to the YIG element 16 to resonate the YIG element, whereby the YIG device can have a small ?H and a large threshold electric power for generating the resonance saturation.

Abstract: A YIG device comprises a resonator including a YIG element 16 of a single crystalline yttrium iron garnet having a part of yttrium substituted with gadolinium, which is formed in a spherical shape, and magnetic field applying means 20 for applying a magnetic field to the YIG element 16 to resonate the YIG element, whereby the YIG device can have a small AH and a large threshold electric power for generating the resonance saturation.

Abstract: An evacuating apparatus includes a first pump section disposed on a suction opening side, a second pump section for exhausting a smaller amount of gas than the first pump section, the second pump being disposed in an exhaust opening side, a plurality of rotors accommodated in a housing, bearings for supporting rotation of the rotors, a suction opening for drawing fluid and a first exhaust opening thereof both formed on the housing, and a plurality of motors for driving the rotors. In the apparatus, the first pump section is a pump of positive displacement type formed by utilizing a volume change of a space defined by the rotors and the housing, and the second pump section is a viscous-type pump formed by utilizing a relatively moving surface formed in a small gap defined between the rotors and the housing.

Abstract: An electrical connector has a main unit with and integral row of parallel connector pins. A first end of each connector pin is at a front of main unit and a second end is at a rear of main unit. Each parallel connector pin is bent downward toward the back so that they project downward from the bottom surface of main unit. A socket shield made from a thin plate surrounds the upper and lower surfaces and the two side surfaces of main unit. A pair of substrate fixing claws project downward from the sides of the lower surface at the rear of main unit. The socket shield also has an engagement piece projecting downward from the front region of the lower surface. The pair of substrate fixing claws and the engagement piece both engage the mounting substrate when the electrical connector is mounted on the mounting substrate.

Abstract: A positive displacement vacuum pump, in which a plurality of rotors are driven into synchronous operation by independent motors, uses a rotational position sensor making use of the electromagnetic induction effect for obtaining rotational position information for the individual shafts. The rotational position sensor is cooled.

Abstract: A hinge device is provided for pivoting a cover to a base housing and is designed such that when the cover is in a closed position it does not easily come off the base housing when subjected to external force yet the cover is easily and readily removable for replacement. The hinge device has an engagement hole 12c disposed on a housing 12 to pivotably support a cover 13 around a pivot axis, an engagement portion 13a is disposed on cover 13 to rotatably fit in the engagement hole and is formed relatively short so that it can easily disengage from engagement hole 12c when an impact is received. An arcuate guide groove 12d is formed on the housing around the engagement hole so that a guide pin 13b on the cover can engage with the guide groove to guide cover movement between open and closed positions as well as aid in absorbing impact forces acting on the cover when the cover is closed.

Abstract: An evacuating apparatus includes a first pump section disposed on a suction opening side, a second pump section for exhausting a smaller amount of gas than the first pump section, the second pump being disposed in an exhaust opening side, a plurality of rotors accommodated in a housing, bearings for supporting rotation of the rotors, a suction opening for drawing fluid and a first exhaust opening thereof both formed on the housing, and a plurality of motors for driving the rotors. In the apparatus, the first pump section is a pump of positive displacement type formed by utilizing a volume change of a space defined by the rotors and the housing, and the second pump section is a viscous-type pump formed by utilizing a relatively moving surface formed in a small gap defined between the rotors and the housing.

Abstract: An evacuating apparatus includes a first pump section disposed on a suction opening side, a second pump section for exhausting a smaller amount of gas than the first pump section, the second pump being disposed in an exhaust opening side, a plurality of rotors accommodated in a housing, bearings for supporting rotation of the rotors, a suction opening for drawing fluid and a first exhaust opening thereof both formed on the housing, and a plurality of motors for driving the rotors. In the apparatus, the first pump section is a pump of positive displacement type formed by utilizing a volume change of a space defined by the rotors and the housing, and the second pump section is a viscous-type pump formed by utilizing a relatively moving surface formed in a small gap defined between the rotors and the housing.

Abstract: A fluid feed apparatus includes a suction hole and a discharge hole for a fluid, a fluid transfer part provided between a rotor and a stationary member containing the rotor, a shaft coupled with the rotor, a rotation actuator for rendering a relative rotating motion between the shaft and the stationary member in a surface perpendicular to an axis of the shaft, a driving power supply for the rotation actuator, a rotating motion control unit for the rotation actuator, a swing actuator for rendering a relative swinging motion between the shaft and the stationary member, a driving power supply for the swing actuator, and a swinging motion control unit for the swing actuator. Synchronous control is performed by the rotating motion control unit and the swinging motion control unit so that the rotating motion and the swinging motion are synthesized to implement a revolving motion.

Abstract: A fluid rotary apparatus includes a casing, a plurality of screw rotors, and a driving device. The casing has a suction hole, a discharging hole, and an inner tapered surface. The rotors have thread grooves and are rotatably supported within the casing to be rotated synchronously in mesh with each other. An outer peripheral surface of each rotor has a flat surface approaching or sliding in contact with the inner tapered surface of the casing. The driving device rotates the rotors. Fluid is drawn through the suction hole, compressed, and discharged through the discharging hole by utilization of a change of a volume of a space defined by the plurality of screw rotors and the casing. A band-like chip seal is provided at the flat surface of each rotor. The chip seal has dynamic pressure notches at it surface to produce dynamic pressure from viscous fluid.