Abstract: An angular velocity sensor includes a vibration, first and second sensor electrodes generating an electric charge responsive to an angular velocity applied to the vibration body, first and D/A converters each outputting at least two levels of an electric charge, first and second integrator circuits integrating the electric charge generated by the first and second sensor electrodes and the electric charges output from the first and second D/A converters, respectively, a comparator unit comparing output signals from the first and second integrator circuits, first and second D/A switching units switching levels of the output signals from the first and second D/A converters according to a comparison result of the comparator unit, a first disconnection detecting switch connected between the first sensor electrode and the first integrator circuit, a first voltage source for injecting an electric charge into a point between the first sensor electrode and the first integrator circuit via the first disconnection detec

Abstract: A method for producing silicon, the method comprising a heating step of heating a metal powder Mp1 made of at least one member selected from the group consisting of Mg, Ca and Al in a plasma P; and a reducing step of reducing a halogenated silane G1 by the metal powder Mp2 heated in the plasma P to obtain silicon.

Abstract: The present invention relates to improvement in alloy powder particles or wires used as a source material in atmospheric plasma spray and wire arc spray to reduce the amount of oxides on the thermal-sprayed coating. The alloy particles and the wire of the present invention 1 are doped with at least an element to be oxidized and evaporated preferentially as compared to the major alloy elements on the particle surface during flight by spraying.

Abstract: An angular velocity sensor has a stable output characteristic using a sigma-delta type analog-to-digital converter. The sigma-delta type analog-to-digital converter includes an integrator unit for integrating electric charges output from an input switching device and a digital-to-analog converter unit, and holding at least two integrated values, a comparator unit for comparing at least the two integrated values output from the integrator unit with a predetermined value. The sigma-delta-type analog-to-digital converter also includes an arithmetic operation unit for operating an output signal of the comparator unit, the arithmetic operation unit being provided with a differential operation unit for computing a difference between at least two comparison signals output from comparator unit.

Abstract: The present invention particularly relates to an inertial force sensor used in various electronic equipment, for example, used for altitude control, navigation, or the like, of a mobile body such as an aircraft, an automobile, a robot, a watercraft and a vehicle in which the detection accuracy is enhanced. Therefore, a sense circuit constituting the inertial force sensor includes a sigma-delta modulator converting a sense signal output from a sense electrode into a one-bit digital signal, and a signal processing circuit (i) comparing a monitor signal output from a monitor electrode with predetermined reference amplitude information, (ii) carrying out operation processing of the one-bit digital signal based on this comparison information, and (iii) adjusting an output level of the output signal.

Abstract: A substrate is immersed in a metal compound solution prepared by dissolving a plurality of metal compounds of metals differing from each other, to thereby form an alloy film having a desired alloy composition on the surface of the substrate.

Abstract: The electric power steering apparatus is provided with: a steering torque detector that detects steering torque of a steering wheel; an electric motor that applies steering assist force to the steering wheel; a current detector that detects an actual current actually supplied to the electric motor; a target current setting unit that sets a target current to be supplied to the electric motor, on the basis of the steering torque detected by the steering torque detector; a feedback controller that performs feedback control so that the target current and the actual current coincide with each other; and a feedforward controller that performs feedforward control for increasing the actual current detected by the current detector if the target current increases, the feedforward controller including a frequency compensator that provides a smaller amount of increase in the actual current as a frequency of a variation in the target current is lower.

Abstract: A PLL circuit is provided with an AD converter, a DA converter to which output from the AD converter is inputted, a filter circuit filtering an output signal of the DA converter, a voltage control oscillator outputting a signal of a different frequency in accordance with an output signal from the filter circuit and a frequency divider dividing a signal which the voltage control oscillator outputs. The AD converter operates by a timing signal from the voltage control oscillator and the DA converter outputs an analog signal corresponding to a value which the AD converter outputs by the timing signal outputted from the frequency divider.

Abstract: An angular velocity sensor with a stable output characteristic using a sigma-delta type analog-to-digital converter comprising an integrator unit for integrating electric charges output from an input switching device and a digital-to-analog converter unit and holding at least two integrated values, a comparator unit for comparing at least the two integrated values output from the integrator unit with a predetermined value, and an arithmetic operation unit for operating an output signal of the comparator unit, the arithmetic operation unit provided with a differential operation unit for computing a difference between at least two comparison signals output from comparator unit.

Abstract: The present invention particularly relates to an inertial force sensor used in various electronic equipment, for example, used for attitude control, navigation, or the like, of a mobile body such as an aircraft, an automobile, a robot, a watercraft and a vehicle in which the detection accuracy is enhanced. Therefore, a sense circuit constituting the inertial force sensor includes a sigma-delta modulator for converting a sense signal output from a sense electrode into a one-bit digital signal, and a signal processing circuit for comparing a monitor signal output from a monitor electrode with predetermined reference amplitude information, carrying out operation processing of the one-bit digital signal based on this comparison information, and adjusting an output level of the output signal.

Abstract: An iridium-containing nickel-base superalloy which has an orderly arrayed allow structure to be strengthened by precipitation and contains iridium dissolved in the &ggr; and &ggr;′ phases to be strengthened by solid solution, thus being improved in high-temperature strength and resistance to high-temperature corrosion.

Abstract: Refractory superalloys consist essentially of a primary constituent selected from the group consisting of iridium, rhodium, and a mixture thereof, and one or more additive elements selected from the group consisting of niobium, tantalum, hafnium, zirconium, uranium, vanadium, titanium and aluminum, and the superalloys having a microstructure containing an FCC-type crystalline structure phase and an L1.sub.2 -type crystalline structure phase are precipitated. Preferably the amount of additive element(s) is 2 to 22 atom %.

Abstract: An improvement is proposed in the method for adhesively bonding a decorative overlay film of a plastic resin to the surface of an acrylic resin board with a hot-melt adhesive, by which the overlaid acrylic resin board can be imparted with greatly improved stability of overlaying lamination as well as good machining workability of the board. The improved method comprises the steps of: (a) demoisturizing the acrylic resin board by heating at 60-90.degree. C. for at least 2 hours; (b) forming a layer of a hot-melt adhesive on at least either one of the resin board and the overlay film; (c) laminating the resin board and the overlay film with the adhesive layer therebetween to obtain a laminate by passing between a pair of laminating rollers while the surfaces to be brought into contact with each other are kept at an elevated temperature; and (d) subjecting the laminate to an aging treatment by heating at 30-60.degree. C. for at least 1 hour.

Abstract: A speaker unit has a cylindrical yoke, an annular frame secured to the yoke, and a diaphragm having a central spherical vibrating portion and an annular support portion formed around the vibrating portion and mounted on the annular frame. An annular vertical holding wall is formed on the annular frame, and an annular vertical abutment portion is formed on the annular support portion and abutted against the annular vertical holding wall.