Abstract: A motor drive device has a drive circuit for driving a motor, and a control section for controlling the drive circuit. The control section has a current command value calculating portion for calculating a current command value, a rotation calculating portion for calculating a rotation angle and an angular speed of the motor, a current command value correcting portion for correcting the current command value based on the rotation angle, a voltage command value calculating portion for calculating a voltage command value based on the current command value, a voltage command value correcting portion for correcting the voltage command value based on the current command value and the rotation angle and the angular speed, and a drive signal generating portion for generating a drive signal based on the voltage command value.

Abstract: A method of manufacturing multilayer printed wiring hoard in which electric connectivity and functionality are obtained by improving reliability and particularly, reliability to the drop test can be improved. In the inventive method, no corrosion resistant layer is formed on a solder pad 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, a land in which the corrosion resistant layer is formed by the method is unlikely to occur contact failure even if a carbon pillar constituting an operation key makes repeated contacts.

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 motor drive device has a drive unit for driving a motor based on an ON/OF operation of a switching element by a PWM (Pulse Width Modulation) signal. The motor drive device uses a PWM control method and performs abnormal determination based on an application voltage value and an actual measurement voltage value of the motor. The motor drive device does not make a false determination of determining as abnormal when it is normal, when determining the presence of abnormality based on the application voltage value and the actual measurement voltage value of the motor.

Abstract: A controller of a multi-phase electric motor has a drive section having an upper arm switching element and a lower arm switching element for driving the multi-phase electric motor, a single current detection section for detecting a current value of the multi-phase electric motor, a pulse width modulation signal generation section for generating plural pulse width modulation of each phase within one control period based on the current value detected by the current detection section and a carrier signal, and a phase movement section for moving the pulse width modulation signal of a predetermined phase generated by the pulse width modulation signal generation section by gradually changing a movement amount of the phase in one control period, and outputting the resultant pulse width modulation signal to the drive section.

Abstract: A multilayer printed wiring board including insulating layers, conductor layers stacked alternately over the insulating layers, respectively, and viaholes formed in the insulation layers and electrically connecting the conductor layers through the insulation layers. The viaholes include a first group of viaholes and a second group of viaholes. The viaholes in the first group are tapered toward the viaholes in the second group, and the viaholes in the second group are tapered toward the viaholes in the first group. The viaholes in the first group and the the viaholes in the second group are formed in the insulating layers, respectively, and the viaholes are formed by plating openings formed after lamination of respective ones of the insulating layers, and each of the insulating layers is about 100 ?m or less in thickness.

Abstract: A method of forming a circuit board which includes generating laser light with a carbon dioxide laser and making a hole through an insulating substrate by irradiating the insulating substrate with the laser light. The hole includes a top opening in a top surface of the insulating substrate, a bottom opening in a bottom surface of the insulating substrate, and an inner wall extending from the top opening to the bottom opening along a thickness direction of the insulating substrate, the inner wall including a bulge which extends in a direction generally orthogonal to the thickness direction. A via hole is formed in the insulating substrate by providing metal in the hole such that the metal extends from the top opening to the bottom opening along the inner wall, and completely closes each of the top and bottom openings.

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.

Abstract: A motor drive device has a drive circuit for driving a motor, and a control section for controlling the drive circuit. The control section has a current command value calculating portion for calculating a current command value, a rotation calculating portion for calculating a rotation angle and an angular speed of the motor, a current command value correcting portion for correcting the current command value based on the rotation angle, a voltage command value calculating portion for calculating a voltage command value based on the current command value, a voltage command value correcting portion for correcting the voltage command value based on the current command value and the rotation angle and the angular speed, and a drive signal generating portion for generating a drive signal based on the voltage command value.

Abstract: A motor drive device has a drive unit having at least three pairs of upper and lower arms including switching elements at each of the upper arm and the lower arm, for driving a motor based on an ON/OFF operation of each of the switching elements by a PWM signal, a single current detection resistor for detecting a current flowing to the drive unit, and a control unit for detecting a current value of a current flowing to each phase of the motor based on the current flowing to the current detection resistor, and outputting the PWM signal to each of the switching elements based on a target current value of each phase and the detected current value of each phase.

Abstract: A multilayer printed wiring board including insulating layers and conductor layers being stacked alternately on each other. The conductor layers are electrically connected to each other through viaholes formed in the insulating layers. Each of the viaholes is formed to bulge in a direction generally orthogonal to the direction of thickness of the insulating layer. The multilayer printed wiring board is to have electronic components such as a capacitor, IC and the like mounted on the surface layer thereof.

Abstract: A motor drive device has a drive unit for driving a motor based on an ON/OFF operation of a switching element by a PWM (Pulse Width Modulation) signal. The motor drive device uses a PWM control method and performs abnormal determination based on an application voltage value and an actual measurement voltage value of the motor. The motor drive device does not make a false determination of determining as abnormal when it is normal, when determining the presence of abnormality based on the application voltage value and the actual measurement voltage value of the motor.

Abstract: A motor drive device has a drive unit at least three sets of upper and lower arms, each of the at least three sets of upper and lower arms having switching elements thereon, for driving a motor based on an ON/OFF operation of each of the switching elements by a PWM signal, a single current detection resistor for detecting current flowing to the drive unit, and a control unit for detecting a current value of the current flowing to each of phases of the motor based on the current flowing to the current detection resistor, and outputting the PWM signal to each of the switching elements based on a target current value of each of the phases and the detected current value of each of the phases.

Abstract: A multilayer printed wiring board comprises a plurality of insulating layers which is about 100 ?m or less in thickness and a plurality of conductor circuits formed on the insulating layers. Each of a plurality of viaholes electrically connecting conductor circuits on the insulating layers to each other is formed tapered inwardly from the surface of the insulating layer and the viaholes are disposed opposite to each other to form a multistage stacked vias.

Abstract: The present invention relates to a spatial information detecting system. A magnetic sensor driving unit drives a magnetic sensor via a multiplexer unit. Signals of the magnetic sensor are converted from analog signals to digital signals, and are transmitted from a data transmitting unit to an arithmetic unit as magnetic data. A Fourier transform unit calculates the amplitudes and phases of a plurality of frequency components of individual axes from the output signal of the magnetic data receiving unit. A magnetic field vector calculating unit calculates signs of the amplitudes of the individual axes from phase relationships between the plurality of frequency components on the individual axes from the output signal from the Fourier transform unit, and calculates the magnetic field vector representing the direction and magnitude of the magnetic field from the signs and amplitudes. A direction calculating unit calculates the direction of the information terminal.

Abstract: A multilayer printed wiring board including insulating layers, conductor layers stacked alternately over the insulating layers, respectively, and viaholes formed in the insulation layers and electrically connecting the conductor layers through the insulation layers. The viaholes include a first group of viaholes and a second group of viaholes. The viaholes in the first group are tapered toward the viaholes in the second group, and the viaholes in the second group are tapered toward the viaholes in the first group. The viaholes in the first group and the the viaholes in the second group are formed in the insulating layers, respectively, and the viaholes are formed by plating openings formed after lamination of respective ones of the insulating layers, and each of the insulating layers is about 100 ?m or less in thickness.

Abstract: A multilayer printed wiring board comprises insulating layers and conductor layers being stacked alternately on each other. The conductor layers are electrically connected to each other through viaholes formed in the insulating layers. Each of the viaholes is formed to bulge in a direction generally orthogonal to the direction of thickness of the insulating layer. The multilayer printed wiring board is to have electronic components such as a capacitor, IC and the like mounted on the surface layer thereof.

Abstract: A multilayer printed wiring board comprises insulating layers and conductor layers being stacked alternately on each other. The conductor layers are electrically connected to each other through viaholes formed in the insulating layers. Each of the viaholes is formed to bulge in a direction generally orthogonal to the direction of thickness of the insulating layer. The multilayer printed wiring board is to have electronic components such as a capacitor, IC and the like mounted on the surface layer thereof.

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: 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.