Abstract: A drive unit includes: a pedal crankshaft to which a pedal stepping force of a rider is applied; an electric motor that detects a torque input to the pedal crankshaft and generates a drive force; and a transmission that changes shift of the drive force of the electric motor and delivers the drive force to the pedal crankshaft, the transmission includes a main shaft that supports a plurality of drive gears and a counter shaft that supports a plurality of driven gears that engage with the plurality of respective drive gears, and the transmission selects one torque delivery gear among the plurality of drive gears, delivers the drive force of the electric motor to the counter shaft, and shifts the torque delivery gear without inverting a rotational direction of the drive gear.

Abstract: A drive unit includes: a pedal crankshaft to which a pedal stepping force of a rider is applied; an electric motor that detects a torque input to the pedal crankshaft and generates a drive force; and a transmission that changes shift of the drive force of the electric motor and delivers the drive force to the pedal crankshaft, the transmission includes a main shaft that supports a plurality of drive gears and a counter shaft that supports a plurality of driven gears that engage with the plurality of respective drive gears, and the transmission selects one torque delivery gear among the plurality of drive gears, delivers the drive force of the electric motor to the counter shaft, and shifts the torque delivery gear without inverting a rotational direction of the drive gear.

Abstract: A transmission circuit for ultrasonic diagnosis includes a delay processing circuit that delays a transmission signal pattern and an operational circuit that calculates a delay time. A transmission timing for supplying the transmission signal pattern to a plurality of piezo electric elements corresponding to a plurality of channels is approximated by a multi-dimensional polynomial with locations of the plurality of piezo electric elements being variables so that the transmission timing becomes linear or arc-like. Coefficients in the multi-dimensional polynomial are supplied to the transmission circuit for ultrasonic diagnosis. The delay time in the delay processing circuit is determined by a first coefficient. The operational circuit calculates the delay time based on a second coefficient.

Abstract: An electronic circuit includes a first level shift circuit, a second level shift circuit, an internal circuit, a high voltage circuit, first and second transistors, and first and second protective circuits. The first and second protective circuits perform control the first and second transistors so as to make them non-conductive when at least one of a plurality of types of power supply voltages becomes equal to or less than a predetermined value.

Abstract: A transmission circuit for ultrasonic diagnosis includes a delay processing circuit that delays a transmission signal pattern and an operational circuit that calculates a delay time. A transmission timing for supplying the transmission signal pattern to a plurality of piezo electric elements corresponding to a plurality of channels is approximated by a multi-dimensional polynomial with locations of the plurality of piezo electric elements being variables so that the transmission timing becomes linear or arc-like. Coefficients in the multi-dimensional polynomial are supplied to the transmission circuit for ultrasonic diagnosis. The delay time in the delay processing circuit is determined by a first coefficient. The operational circuit calculates the delay time based on a second coefficient.

Abstract: An electronic circuit includes a first level shift circuit, a second level shift circuit, an internal circuit, a high voltage circuit, first and second transistors, and first and second protective circuits. The first and second protective circuits perform control the first and second transistors so as to make them non-conductive when at least one of a plurality of types of power supply voltages becomes equal to or less than a predetermined value.

Abstract: A V-belt continuously variable transmission in which an actuator unit for driving a movable sheave is slidably supported by a transmission case that is formed by fastening a plurality of case members with a plurality of fastening members, for ensuring a sufficient space for slidably moving the actuator unit and enhancing workability of mounting and dismounting operation of the actuator unit. A flat mounting surface for mounting the actuator unit is formed on an outer surface of the transmission case. Also, a recessed portion recessed inwardly of the transmission case from the mounting surface is formed to have at an inner end thereof a fastening seat face for a specific fastening member out of the plurality of fastening members, the specific fastening member being disposed at a portion corresponding to the mounting surface. The whole specific fastening member is disposed inwardly of the transmission case relative to the mounting surface.

Abstract: A semiconductor integrated circuit device that has a high-voltage analog switch circuit and is operable at a low power-supply voltage, and which has a first high-voltage MOSFET HN1, a second high-voltage MOSFET, and a first floating gate voltage control circuit. The first floating gate voltage control circuit operates at a voltage of 5 V or lower, and when turning on the first high-voltage MOSFET and the second high-voltage MOSFET, the first floating gate voltage control circuit sets a voltage in the source terminal of the first high-voltage MOSFET as a reference voltage, adds a floating voltage corresponding to the power-supply voltage to the reference voltage, and supplies the added voltage to the gate terminals of the first high-voltage MOSFET and the second high-voltage MOSFET.

Abstract: Provided is a switching circuit capable of transmitting a signal with large amplitude and large current while suppressing deterioration when a small-amplitude signal is transmitted. The switching circuit 100 includes a first terminal a, a second terminal b, a first switch 1, a second switch 2, a first separation switch 3a, and a second separation switch 3b. The first switch 1 connects the first terminal a and the second terminal b according to a control signal. The second switch 2 has a first node n1 and a second node n2, and connects between the nodes in synchronization with the first switch 1. The first separation switch 3a transmits a signal of the first node n1 to the second node n2 when an electric potential of the first node n1 is higher than that of the second node n2 by more than a predetermined electric potential.

Abstract: Provided is a transmission drive circuit which can reduce distortions of a transmission signal and transmission noise, and is isolable from a signal line. A transmission drive circuit 700 includes a drive transistor 10 and an isolation diode 31 connected between a node n1 coupled to a signal line SL commonly used to propagate a transmission signal and a reception signal and a power source line HVP, and further includes an isolation diode 32 and a drive transistor 20 connected between the node n1 and a voltage line HVM. Furthermore, the transmission drive circuit 700 includes a switch 41 connected between a node n2 between the drive transistor 10 and the isolation diode 31, and a node n4 of a ground voltage Vs, and a switch 43 connected between a node n3 between the drive transistor 20 and the isolation diode 32, and a node n4.

Abstract: Provided is a semiconductor integrated circuit device that has a high-voltage analog switch circuit and is operable at a low power-supply voltage. The semiconductor integrated circuit device has a high-voltage MOSFET in a semiconductor region arranged on a semiconductor substrate. The semiconductor integrated circuit device includes: a first high-voltage MOSFET HN1; a second high-voltage MOSFET HN2 having a source terminal connected to the source terminal of the first high-voltage MOSFET and a gate terminal connected to the gate terminal of the first high-voltage MOSFET; and a first floating gate voltage control circuit FGC.

Abstract: Provided is a transmission drive circuit which can reduce distortions of a transmission signal and transmission noise, and is isolable from a signal line. A transmission drive circuit 700 includes a drive transistor 10 and an isolation diode 31 connected between a node n1 coupled to a signal line SL commonly used to propagate a transmission signal and a reception signal and a power source line HVP, and further includes an isolation diode 32 and a drive transistor 20 connected between the node n1 and a voltage line HVM. Furthermore, the transmission drive circuit 700 includes a switch 41 connected between a node n2 between the drive transistor 10 and the isolation diode 31, and a node n4 of a ground voltage Vs, and a switch 43 connected between a node n3 between the drive transistor 20 and the isolation diode 32, and a node n4.

Abstract: Provided is a switching circuit capable of transmitting a signal with large amplitude and large current while suppressing deterioration when a small-amplitude signal is transmitted. The switching circuit 100 includes a first terminal a, a second terminal b, a first switch 1, a second switch 2, a first separation switch 3a, and a second separation switch 3b. The first switch 1 connects the first terminal a and the second terminal b according to a control signal. The second switch 2 has a first node n1 and a second node n2, and connects between the nodes in synchronization with the first switch 1. The first separation switch 3a transmits a signal of the first node n1 to the second node n2 when an electric potential of the first node n1 is higher than that of the second node n2 by more than a predetermined electric potential.

Abstract: A V-belt continuously variable transmission in which an actuator unit for driving a movable sheave is slidably supported by a transmission case that is formed by fastening a plurality of case members with a plurality of fastening members, for ensuring a sufficient space for slidably moving the actuator unit and enhancing workability of mounting and dismounting operation of the actuator unit. A flat mounting surface for mounting the actuator unit is formed on an outer surface of the transmission case. Also, a recessed portion recessed inwardly of the transmission case from the mounting surface is formed to have at an inner end thereof a fastening seat face for a specific fastening member out of the plurality of fastening members, the specific fastening member being disposed at a portion corresponding to the mounting surface. The whole specific fastening member is disposed inwardly of the transmission case relative to the mounting surface.

Abstract: A T/R switch applicable to an ultrasonograph and capable of transmitting a signal reflected from a living body over a wide band with low noise without causing erroneous operation of the switch or element destruction even when the potential of a transmission signal or reflected signal changes includes: a common source terminal commonly and serially coupling the source terminals of two MOS transistors; a common gate terminal commonly coupling the gate terminals of the two MOS transistors; a main switch, the drain terminals of which are connected to input/output terminals; and a floating voltage circuit which is connected to the common gate terminal and common source terminal, makes the common gate terminal potential follow, in phase, variation in the common source terminal potential, and sends a signal to turn the switch on or off to the common gate terminal.

Abstract: A T/R switch applicable to an ultrasonograph and capable of transmitting a signal reflected from a living body over a wide band with low noise without causing erroneous operation of the switch or element destruction even when the potential of a transmission signal or reflected signal changes includes: a common source terminal commonly and serially coupling the source terminals of two MOS transistors; a common gate terminal commonly coupling the gate terminals of the two MOS transistors; a main switch, the drain terminals of which are connected to input/output terminals; and a floating voltage circuit which is connected to the common gate terminal and common source terminal, makes the common gate terminal potential follow, in phase, variation in the common source terminal potential, and sends a signal to turn the switch on or off to the common gate terminal.

Abstract: There is provided a circuit whose output is free from high impedance to improve wrong transmission and waveform overshoot, realizing a semiconductor integrated circuit device in which plural channels is integrated with transmitter circuit as unit channel, in the transmitter circuit used in a medical ultrasound system and drives a transducer by voltage pulses having plural positive and negative electric potentials including ground potential. The transmitter circuit includes a conventional pulse generating circuit supplied with positive and negative voltage largest in absolute value, a P-channel analog switching pulse generating circuit supplied with positive voltage being the second largest therein, an N-channel analog switching pulse generating circuit supplied with negative voltage being the second largest, and an N-channel analog switching ground level damping circuit supplied with ground potential. The circuits are connected to output terminal.

Abstract: A semiconductor integrated circuit having a plurality of ultrasound pulsers corresponding to a plurality of respective channels, and integrally formed on a small area. The ultrasound pulsers each include a MOSFET gate drive circuit in which an input voltage pulse is converted into a current pulse, and the current pulse is converted again into a voltage pulse on the basis of a high potential side voltage +HV, and a low potential side voltage ?HV, applied to a transducer drive circuit, and in which a voltage level shift in the input voltage pulse is attained, and a voltage pulse swing is generated by the MOSFET gate drive circuit on the basis of the high potential side voltage +HV, and the low potential side voltage ?HV. The MOSFET gate drive circuit is DC-coupled with the transducer drive circuit.

Abstract: There is provided a circuit whose output is free from high impedance to improve wrong transmission and waveform overshoot, realizing a semiconductor integrated circuit device in which plural channels is integrated with transmitter circuit as unit channel, in the transmitter circuit used in a medical ultrasound system and drives a transducer by voltage pulses having plural positive and negative electric potentials including ground potential. The transmitter circuit includes a conventional pulse generating circuit supplied with positive and negative voltage largest in absolute value, a P-channel analog switching pulse generating circuit supplied with positive voltage being the second largest therein, an N-channel analog switching pulse generating circuit supplied with negative voltage being the second largest, and an N-channel analog switching ground level damping circuit supplied with ground potential. The circuits are connected to output terminal.

Abstract: With an ultrasound pulser suitable for application to a medical ultrasound system, and so forth, a high voltage power supply of a transducer drive circuitry, on both high potential and low potential sides, is rendered variable in a range of 0 V on the order of ±200 V, thereby implementing a semiconductor integrated circuit wherein a plurality of the ultrasound pulsers corresponding to a plurality of channels, respectively, are integrally formed on a small area.