Abstract: A power supply device includes a substrate, a transformer, a rectifying section, a filtering section, at least one first capacitor section, and a second capacitor section. The substrate includes at least one semiconductor element. The transformer inputs an electric power via at least one pair of primary-side terminals, transforms the input electric power, and outputs the transformed electric power via at least one pair of secondary-side terminals. The rectifying section includes at least one rectifying element configured to rectify the transformed electric power. The filtering section reduces alternating-current components included in the rectified electric power. The first capacitor section is connected in parallel to the at least one rectifying element. The second capacitor section generates one or more harmonic waves that reduce a peak value of a fundamental wave of resonance generated based on a leakage inductance component of the transformer and a capacitance component of the first capacitor section.

Abstract: An internal combustion engine 100 comprises an air-fuel ratio control device. The air-fuel ratio control device controls the amount of fuel fed to the combustion chamber by feedback control so that the air-fuel ratio detected by the upstream side air-fuel ratio sensor matches the target air-fuel ratio when a blow-through amount of air blown from the intake passage through a cylinder to the exhaust passage due to an occurrence of valve overlap is a reference blow-through amount or less. The air-fuel ratio control device sets the target air-fuel ratio of the inflowing exhaust gas based on the air-fuel ratio detected by the downstream side air-fuel ratio sensor and, without performing the feedback control, feeds the amount of fuel calculated from the target air-fuel ratio to the combustion chamber when the blow-through amount is greater than the reference blow-through amount.

Abstract: A seat device for a vehicle is provided in which a dynamic damper is formed of a weight and an elastic member supporting the weight so as to be capable of vibrating, and the elastic member is retained on a frame or a cushion member of a seat installed in the vehicle, wherein the weight is formed into a polyhedron whereas the elastic member is formed into a sheet shape, and the weight is covered and supported by the sheet-shaped elastic member. This enables the weight to be supported simply by the elastic member, and the dynamic damper to be provided at low cost.

Abstract: An electrical device has a housing that includes a main body and a lid both of which are electrically conductive. The lid is fastened to a top surface of a sidewall of the main body so as to cover the main body. On at least one of a bottom surface of the lid and the top surface of the sidewall of the main body, there are formed a plurality of protrusions at predetermined positions; each of the protrusions abuts against that one of the bottom surface of the lid and the top surface of the sidewall which is opposed to the protrusion. Except at those predetermined positions where the protrusions are formed, there is provided, between the bottom surface of the lid and the top surface of the sidewall of the main body, a gap via which the internal and external spaces of the housing communicate with each other.

Abstract: A seat device for a vehicle is provided in which a dynamic damper is formed of a weight and an elastic member supporting the weight so as to be capable of vibrating, and the elastic member is retained on a frame or a cushion member of a seat installed in the vehicle, wherein the weight is formed into a polyhedron whereas the elastic member is formed into a sheet shape, and the weight is covered and supported by the sheet-shaped elastic member. This enables the weight to be supported simply by the elastic member, and the dynamic damper to be provided at low cost.

Abstract: In a seat device for a vehicle, a dynamic damper comprises a damper case that is formed from first and second case halves joined together so as to be capable of separating from each other to define a damper chamber therebetween, a weight that is housed in the damper chamber, and an elastic member that is disposed between the weight and an inner face of the damper chamber so as to allow vibration of the weight, the damper case being provided with a mounting part that is mounted on a frame of the seat. Thus, it is possible to provide a seat device for a vehicle in which replacement of a weight and an elastic member in order to adjust or change the damping characteristics is possible, and the ease of mounting a damper case on a seat is good.

Abstract: A power supply apparatus includes a magnetic component having a coil section, a conductive case body housing the magnetic component and having an opening plane facing an axial direction of the coil section, a case lid closing the opening plane, and conductive parts electrically connecting the case body and the case lid to each other at the opening plane. The conductive parts are provided so as to satisfy a positional relationship that at least one of the conductive parts is disposed at an intersection point at which a straight line making an angle within a range of 45±15 degrees with a perpendicular line drawn from a center of the coil section to a closest one of the side plate portions of the case body to the center intersects with the closest one of side plate portions when viewed from the axial direction.

Abstract: In a vehicle seat device including a vibration system formed from a seat back and a headrest being equipped with a dynamic damper, the dynamic damper is formed from an elastic member that is embedded within a cushion member of the vibration system and formed from a rubber or elastomer that is softer than the cushion member, and a weight embedded in the elastic member. Thus it is possible to provide a vehicle seat device that includes a dynamic damper having a small number of components and a simple structure.

Abstract: A power supply device includes a substrate, a transformer, a rectifying section, a filtering section, at least one first capacitor section, and a second capacitor section. The substrate includes at least one semiconductor element. The transformer inputs an electric power via at least one pair of primary-side terminals, transforms the input electric power, and outputs the transformed electric power via at least one pair of secondary-side terminals. The rectifying section includes at least one rectifying element configured to rectify the transformed electric power. The filtering section reduces alternating-current components included in the rectified electric power. The first capacitor section is connected in parallel to the at least one rectifying element. The second capacitor section generates one or more harmonic waves that reduce a peak value of a fundamental wave of resonance generated based on a leakage inductance component of the transformer and a capacitance component of the first capacitor section.

Abstract: A power converter capable of activating a control circuit therein without increasing a length of a wiring for conveying an external activation signal. In the power converter, a converter circuit isolates a first voltage of a first power supply, converts the first voltage into a second voltage, and outputs the second voltage to a second power supply. A first power supply connecting circuit connects the first power supply to the converter circuit in response to the activation signal. An activation circuit determines whether or not the activation signal has been received by the first power supply connecting circuit on the basis of a voltage between input terminals of the converter circuit and activates the control circuit when it is determined that the activation signal has been received by the first power supply connecting circuit.

Abstract: A power supply apparatus includes a magnetic component having a coil section, a conductive case body housing the magnetic component and having an opening plane facing an axial direction of the coil section, a case lid closing the opening plane, and conductive parts electrically connecting the case body and the case lid to each other at the opening plane. The conductive parts are provided so as to satisfy a positional relationship that at least one of the conductive parts is disposed at an intersection point at which a straight line making an angle within a range of 45±15 degrees with a perpendicular line drawn from a center of the coil section to a closest one of the side plate portions of the case body to the center intersects with the closest one of side plate portions when viewed from the axial direction.

Abstract: An electrical device has a housing that includes a main body and a lid both of which are electrically conductive. The lid is fastened to a top surface of a sidewall of the main body so as to cover the main body. On at least one of a bottom surface of the lid and the top surface of the sidewall of the main body, there are formed a plurality of protrusions at predetermined positions; each of the protrusions abuts against that one of the bottom surface of the lid and the top surface of the sidewall which is opposed to the protrusion. Except at those predetermined positions where the protrusions are formed, there is provided, between the bottom surface of the lid and the top surface of the sidewall of the main body, a gap via which the internal and external spaces of the housing communicate with each other.

Abstract: In a driving circuit for controlling a brightness of a light emitting diode based on a duty ratio of a pulse-width modulation signal, an integration circuit is disposed on a connecting line between a gate of a first transistor coupled with a constant current source and a gate of a second transistor coupled in series with a light emitting diode. The integration circuit smoothes a change in a gate voltage of the first transistor and transmit a smoothed change in the gate voltage to the gate of the second transistor. A third transistor is coupled between a ground and a portion of the connecting line located between the gate of the first transistor and the integration circuit. The third transistor is activated and deactivated based on the duty ratio, thereby changing the gate voltages of the first transistor and the second transistor.

Abstract: In a signal shaper circuit provided between a VICS antenna, which receives a VICS signal and outputs reception input data signal, and a navigation CPU for signal processing, a low pass filter of a resistor and a capacitor is provided. The cutoff frequency of the low pass filter is set to pass light modulation noise included in the input data signal but cut off the input data signal, which is higher in frequency than the light modulation noise. The input data signal is compared with the filter-processed signal used as a reference signal by a comparator. As a result, a final output data signal is outputted in a waveform-shaped form and without loss of data.

Abstract: A power converter capable of activating a control circuit therein without increasing a length of a wiring for conveying an external activation signal. In the power converter, a converter circuit isolates a first voltage of a first power supply, converts the first voltage into a second voltage, and outputs the second voltage to a second power supply. A first power supply connecting circuit connects the first power supply to the converter circuit in response to the activation signal. An activation circuit determines whether or not the activation signal has been received by the first power supply connecting circuit on the basis of a voltage between input terminals of the converter circuit and activates the control circuit when it is determined that the activation signal has been received by the first power supply connecting circuit.

Abstract: In a driving circuit for controlling a brightness of a light emitting diode based on a duty ratio of a pulse-width modulation signal, an integration circuit is disposed on a connecting line between a gate of a first transistor coupled with a constant current source and a gate of a second transistor coupled in series with a light emitting diode. The integration circuit smoothes a change in a gate voltage of the first transistor and transmit a smoothed change in the gate voltage to the gate of the second transistor. A third transistor is coupled between a ground and a portion of the connecting line located between the gate of the first transistor and the integration circuit. The third transistor is activated and deactivated based on the duty ratio, thereby changing the gate voltages of the first transistor and the second transistor.

Abstract: In a signal shaper circuit provided between a VICS antenna, which receives a VICS signal and outputs reception input data signal, and a navigation CPU for signal processing, a low pass filter of a resistor and a capacitor is provided. The cutoff frequency of the low pass filter is set to pass light modulation noise included in the input data signal but cut off the input data signal, which is higher in frequency than the light modulation noise. The input data signal is compared with the filter-processed signal used as a reference signal by a comparator. As a result, a final output data signal is outputted in a waveform-shaped form and without loss of data.

Abstract: The present invention relates to a method for producing cubic boron nitride abrasive grains used for producing a grinding wheel, etc., and to cubic boron nitride abrasive grains. The method comprises maintaining a mixture containing hexagonal boron nitride and seed crystals of cubic boron nitride under pressure and temperature conditions where cubic boron nitride remains thermodynamically stable, characterized in that the seed crystals contain cubic boron nitride twin crystals.

Abstract: A power supply circuit relating to the present invention comprises a differential amplifier for feeding out a voltage as a control voltage in accordance with a difference between a feedback voltage commensurate with an output voltage and a reference voltage, an output current control element for feeding out an output current in accordance with the control voltage fed thereto from the differential amplifier, an output line by way of which the output current is supplied to a load, a feedback line by way of which a voltage on the output line is fed back as the feedback voltage to the differential amplifier, the feedback line connected to the output line, and a sink current generating circuit, connected between the feedback line and ground, for generating a sink current by which the control voltage fed to the output current control element is raised to a predetermined value.

Abstract: A power supply circuit relating to the present invention comprises a differential amplifier for feeding out a voltage as a control voltage in accordance with a difference between a feedback voltage commensurate with an output voltage and a reference voltage, an output current control element for feeding out an output current in accordance with the control voltage fed thereto from the differential amplifier, an output line by way of which the output current is supplied to a load, a feedback line by way of which a voltage on the output line is fed back as the feedback voltage to the differential amplifier, the feedback line connected to the output line, and a clamping circuit for maintaining the control voltage so as not drop below a predetermined value.