Abstract: A lid has a fixing surface to be fixed to a metal board so that a metal surface, equipped with no components, of the metal board is in contact with the fixing surface, a through bore provided in laterally close proximity to the fixing surface and exposing mating parts of an external connector with which harnesses are mated, a fixing edge provided around the through bore and fixed to a housing of the external connector; and fixing pedestals projecting from a circumference of the fixing surface and fixed to the control board. A direction of connecting power supply terminals of the external connector to the metal board is a direction being perpendicular to the metal board. A direction of connecting the control board to signal terminals of the external connector is identical to the direction of connecting the power supply terminals to the metal board.

Abstract: A Hall electromotive force signal detection circuit suppresses variations of spike-like error signals that become obstacles to high-precision detection of Hall electromotive force signals. To this end, in the Hall electromotive force signal detection circuit driving plural Hall elements by spinning current techniques and using plural transconductance amplifiers, a reference signal Vcom is supplied from a feedback network controller to a Hall signal feedback network that performs a feedback control so that common voltages of Hall electromotive force signals from the plural Hall elements match with the reference signal Vcom and to an output signal feedback network that feeds back a voltage obtained by dividing a difference between an output voltage and the reference signal Vcom. In this manner, the variations of spike signals are suppressed.

Abstract: A wiring board includes a core substrate including an insulating layer and a conductor layer formed on the insulating layer, and a build-up layer laminated on the substrate and including an inter-layer insulating layer and a conductor layer laminated on the inter-layer. The substrate has opening penetrating through the insulating layer such that surface of the conductor layer in the substrate is forming bottom of the opening, the substrate has a via conductor formed in the opening and including plating filling the opening, the conductor layer in the substrate includes a metal foil, the conductor layer in the build-up layer includes a metal foil, and the metal foil in the substrate has surface in contact with the surface of the insulating layer such that the surface of the metal foil in the substrate has surface roughness smaller than surface roughness of surface of the metal foil in the build-up layer.

Abstract: A sensor apparatus adjusts output timings of a detection signal and a sensing signal for sensing an abnormality in the detection signal. Provided is a magnetic sensor apparatus comprising a magnetic sensor element, an amplifying section that amplifies and outputs an output of the magnetic sensor element, a plurality of comparing sections that compare the output of the magnetic sensor element or an output of the amplifying section to a threshold value, and a plurality of delaying sections that each delay and output a comparison result output by a corresponding comparing section among the plurality of comparing sections. Also provided is a current sensor apparatus including a current path through which a current serving as a measurement target flows and a magnetic sensor apparatus that is arranged corresponding to the current path and detects a magnetic field generated according to the current serving as the measurement target.

Abstract: A rotation angle measurement apparatus includes: a first Hall element pair for detecting a magnetic component in a first direction; a second Hall element pair for detecting a magnetic component in a second direction different from the first direction; a third Hall element pair for detecting a magnetic component in a third direction different from the first direction and the second direction; and a fourth Hall element pair for detecting a magnetic component in a fourth direction different from the first to third directions. An angle calculation unit calculates a first rotation angle ? of a rotating magnet based upon the strengths of the output signals from the first Hall element pair and the second Hall element pair, and calculates a second rotation angle ?c of the rotating magnet based upon the strengths of the output signals from the third Hall element pair and the fourth Hall element pair.

Abstract: A rotation angle measurement apparatus includes: a first Hall element pair for detecting a magnetic component in a first direction; a second Hall element pair for detecting a magnetic component in a second direction different from the first direction; a third Hall element pair for detecting a magnetic component in a third direction different from the first direction and the second direction; and a fourth Hall element pair for detecting a magnetic component in a fourth direction different from the first to third directions. An angle calculation unit calculates a first rotation angle ? of a rotating magnet based upon the strengths of the output signals from the first Hall element pair and the second Hall element pair, and calculates a second rotation angle ?c of the rotating magnet based upon the strengths of the output signals from the third Hall element pair and the fourth Hall element pair.

Abstract: The present invention relates to a hall electromotive force signal detection circuit and a current sensor thereof each of which is able to achieve excellent wide-band characteristics and fast response as well as high accuracy. A difference calculation circuit samples a component synchronous with a chopper clock generated by a chopper clock generation circuit, out of an output voltage signal of a signal amplifier circuit, at a timing obtained from the chopper clock, so as to detect the component. An integrating circuit integrates an output from the difference calculation circuit in the time domain. An output voltage signal from the integrating circuit is fed back to a signal amplifier circuit via a third transconductance element.

Abstract: A rotation angle measurement apparatus includes: a first Hall element pair for detecting a magnetic component in a first direction; a second Hall element pair for detecting a magnetic component in a second direction different from the first direction; a third Hall element pair for detecting a magnetic component in a third direction different from the first direction and the second direction; and a fourth Hall element pair for detecting a magnetic component in a fourth direction different from the first to third directions. An angle calculation unit calculates a first rotation angle ? of a rotating magnet based upon the strengths of the output signals from the first Hall element pair and the second Hall element pair, and calculates a second rotation angle ?c of the rotating magnet based upon the strengths of the output signals from the third Hall element pair and the fourth Hall element pair.

Abstract: A Hall electromotive force signal detection circuit combines offset cancellation means by a spinning current method of a Hall element with a continuous-time signal processing circuit. A Hall element includes first to fourth terminals, and generates a Hall electromotive force signal voltage Vhall1. Another Hall element generates another Hall electromotive force signal voltage Vhall2. A first switching circuit selects a terminal position for applying a drive current from the four terminals of the Hall element. A second switching circuit selects a terminal position for applying a drive current from the four terminals of the another Hall element, which is different from the terminal position selected by the first switching circuit. A chopper clock generation circuit supplies a chopper clock signal ?1, ?2 having two different phases to the switching circuit, and also supplies the chopper clock signal ?1, ?2 to the first and second switching circuits.

Abstract: A wiring board includes a core substrate including an insulating layer and a conductor layer formed on the insulating layer, and a build-up layer laminated on the substrate and including an inter-layer insulating layer and a conductor layer laminated on the inter-layer. The substrate has opening penetrating through the insulating layer such that surface of the conductor layer in the substrate is forming bottom of the opening, the substrate has a via conductor formed in the opening and including plating filling the opening, the conductor layer in the substrate includes a metal foil, the conductor layer in the build-up layer includes a metal foil, and the metal foil in the substrate has surface in contact with the surface of the insulating layer such that the surface of the metal foil in the substrate has surface roughness smaller than surface roughness of surface of the metal foil in the build-up layer.

Abstract: A motor control apparatus has an inverter circuit having a plurality of pairs of upper and lower arms provided so as to correspond to the number of phases, and switching elements provided on each of the upper arms and the lower arms of each phase that drive a motor on the basis of ON or OFF operations of the respective switching elements, a single current detector that detects a current of the motor flowing through the inverter circuit, and a duty calculator that calculates duties of a PWM signals for turning the switching elements ON or OFF on the basis of a deviation between a current value of the current detected by the current detector and a target current value.

Abstract: There are provided a current sensor which has a self-diagnosis function and a signal processing circuit. The current sensor is provided with an offset component output circuit 102 which extracts an offset component from an output signal of a Hall element 101 which includes a signal component and an offset component, a reference signal generator 103 which outputs a reference signal, and an error signal generation circuit 104 which generates an error signal based on an offset component which the offset component output circuit 102 outputs and a reference signal. The offset component output circuit 102 is provided with a signal amplification circuit 106 which amplifies the output of the Hall element 101 and outputs an output signal and offset component to a low frequency component and the other to a ripple component.

Abstract: A wiring board includes a substrate, pads formed on an electronic-component mounting surface of the substrate, and a resin insulation layer covering the electronic-component mounting surface and having opening portions such that the opening portions are exposing the pads, respectively. The pads include a non-solder mask defined pad having a wiring portion and a non-solder mask defined pad having no wiring portion, and the opening portions are formed such that the non-solder mask defined pads have exposed conductor areas which have substantially same areas inside the opening portions.

Abstract: A motor control apparatus has an inverter circuit having a plurality of pairs of upper and lower arms provided so as to correspond to the number of phases, and switching elements provided on each of the upper arms and the lower arms of each phase that drive a motor on the basis of ON or OFF operations of the respective switching elements, a single current detector that detects a current of the motor flowing through the inverter circuit, and a duty calculator that calculates duties of a PWM signals for turning the switching elements ON or OFF on the basis of a deviation between a current value of the current detected by the current detector and a target current value.

Abstract: A wiring board includes an insulation layer, and a conductive pattern formed on the insulation layer having a repaired disconnected portion. The repaired disconnected portion has a first conductive layer connecting disconnected edges of the conductive pattern and a second conductive layer covering the first conductive layer, the first conductive layer has a first electrical resistivity which is set higher than an electrical resistivity of the conductive pattern, and the second conductive layer has a second electrical resistivity which is set lower than the first electrical resistivity of the first conductive layer.

Abstract: A motor control device has a motor driving unit that drives a motor, a current detecting unit that detects a motor current flowing through the motor, a control unit that compares a detected current value of the motor current detected by the current detecting unit with a target current value to obtain a deviation, to control the motor driving unit based on the deviation, and a compensation unit that sets as a current offset value a detected current value of a drift current detected by the current detecting unit in a state where the motor current is regarded as zero, to compensate the detected current value of the motor current by the current offset value. The compensation unit sets a target offset value according to the current value of the detected drift current to correct the current offset value stepwise until the current offset value reaches the target offset value.

Abstract: A rotation angle measurement apparatus includes: a first Hall element pair for detecting a magnetic component in a first direction; a second Hall element pair for detecting a magnetic component in a second direction different from the first direction; a third Hall element pair for detecting a magnetic component in a third direction different from the first direction and the second direction; and a fourth Hall element pair for detecting a magnetic component in a fourth direction different from the first to third directions. An angle calculation unit calculates a first rotation angle ? of a rotating magnet based upon the strengths of the output signals from the first Hall element pair and the second Hall element pair, and calculates a second rotation angle ?c of the rotating magnet based upon the strengths of the output signals from the third Hall element pair and the fourth Hall element pair.

Abstract: The present invention relates to a hall electromotive force signal detection circuit and a current sensor thereof each of which is able to achieve excellent wide-band characteristics and fast response as well as high accuracy. A difference calculation circuit (15) samples a component synchronous with a chopper clock generated by a chopper clock generation circuit (14), out of an output voltage signal of a signal amplifier circuit (13), at a timing obtained from the chopper clock, so as to detect the component. An integrating circuit (16) integrates an output from the difference calculation circuit (15) in the time domain. An output voltage signal from the integrating circuit (16) is fed back to a signal amplifier circuit (13) via a third transconductance element (17).

Abstract: This invention provides a multilayer printed wiring board in which electric connectivity and functionality are obtained by improving reliability and particularly, reliability to the drop test can be improved. No corrosion resistant layer is formed on a solder pad 60B on which a component is to be mounted so as to obtain flexibility. Thus, if an impact is received from outside when a related product is dropped, the impact can be buffered so as to protect any mounted component from being removed. On the other hand, land 60A in which the corrosion resistant layer is formed is unlikely to occur contact failure even if a carbon pillar constituting an operation key makes repeated contacts.

Abstract: A method for manufacturing a multilayer printed wiring board including forming a multilayer printed wiring board structure comprising first and second buildup portions, the first buildup portion including insulating layers, conductor layers and first viaholes electrically connecting the conductor layers through the insulation layers such that the first viaholes are formed in the insulating layers, respectively, the second buildup portion including insulating layers, conductor layers and second viaholes electrically connecting the conductor layers through the insulation layers such that the first viaholes are tapered toward the second viaholes, and the second via holes are tapered toward the first viaholes. The viaholes are formed by plating openings formed after lamination of respective ones of the insulating layers of the buildup portions, and each insulating layer in the buildup portions is about 100 ?m or less in thickness.