Abstract: Two standard waves from a standard waveform generation circuit are output via an output gate while being interchanged by a direction selector. The switching operation of the direction selector is controlled by a direction control signal M/I. 200 cycles of the standard waveforms are counted by a 200-cycle counter. A drive counter is downcounted every 200 cycles, while the drive counter is upcounted in accordance with the number of drive pulses DRIVE. When the count value of the drive counter becomes zero, output from the output gate is thereby stopped.

Abstract: Two standard waves from a standard waveform generation circuit are output via an output gate while being interchanged by a direction selector. The switching operation of the direction selector is controlled by a direction control signal M/I. 200 cycles of the standard waveforms are counted up by a 200-cycle counter. A drive counter is downcounted every 200 cycles, while the drive counter is upcounted in accordance with the number of drive pulses DRIVE. When the count value of the drive counter becomes zero, output from the output gate is thereby stopped. At the time of startup, outputs from the 200-cycle counter are counted so as to output a drive wave in a predetermined number in a predetermined direction.

Abstract: An antenna holder for holding an antenna includes signal wiring and ground wiring being disposed on a single circuit board as either one of an external element and an internal element respectively with one end electrically coupled with a circuit on the single circuit board for serving as the external element in a spiral shape and the internal element inside of the external element at a predetermined distance. The antenna holder is provided with a spacer for keeping the predetermined distance between the external and the internal elements as well as an external tilt suppressor for suppressing a tilt of the external element from a direction being orthogonal to the circuit board.

Abstract: A voltage detection circuit, comprises a constant-current circuit, a current mirror circuit operated by the constant-current circuit, at least one diode-connected first transistor disposed between an output of the current mirror circuit and a detected voltage, and an output circuit outputting one logic voltage in response to a turn-on of the first transistor when the detected voltage is a predetermined voltage or higher, and outputting the other logic voltage in response to a turn-off of the first transistor when the detected voltage is lower than the predetermined voltage.

Abstract: An antenna includes outer and inner elements, one of which is a signal line and the other of which is a ground line. Each of the outer and inner elements is a helical element having helical portions. The inner element is arranged inside the outer element such that the outer and inner elements are spaced from each other. An axis of the outer element is parallel to that of the inner element.

Abstract: Two standard waves from a standard waveform generation circuit are output via an output gate while being interchanged by a direction selector. The switching operation of the direction selector is controlled by a direction control signal M/I. 200 cycles of the standard waveforms are counted up by a 200-cycle counter. A drive counter is downcounted every 200 cycles, while the drive counter is upcounted in accordance with the number of drive pulses DRIVE. When the count value of the drive counter becomes zero, output from the output gate is thereby stopped. At the time of startup, outputs from the 200-cycle counter are counted so as to output a drive wave in a predetermined number in a predetermined direction.

Abstract: Two standard waves from a standard waveform generation circuit are output via an output gate while being interchanged by a direction selector. The switching operation of the direction selector is controlled by a direction control signal M/I. 200 cycles of the standard waveforms are counted by a 200-cycle counter. A drive counter is downcounted every 200 cycles, while the drive counter is upcounted in accordance with the number of drive pulses DRIVE. When the count value of the drive counter becomes zero, output from the output gate is thereby stopped.

Abstract: A receiver to be used in a smart entry system for a vehicle is provided with an antenna device for receiving a transmission radio wave from a portable device, a receiver circuit for demodulating a receiving signal inputted from the antenna device to extract receiving data, and an AV wire mounted in a rear bumper of the vehicle. The antenna device is constructed with a built-in antenna built in the receiver for receiving a radio wave, an impedance matching circuit for performing impedance matching with the built-in antenna, and a Wilkinson combining circuit which receives input of a first receiving signal received by the built-in antenna and a second receiving signal received by the AV wire to output a signal produced by combining the inputs of the first receiving signal and second receiving signal.

Abstract: A liquid immersion type lens system includes: an optical system main body that has an optical surface at one end along an optical axis, the optical surface contacting a first immersion liquid; a light transmitting member that has two surfaces, one on each end along the optical axis, is disposed opposing the optical surface of the optical system main body, one of the two surfaces contacting the first immersion liquid, the other of the two surfaces contacting a second immersion liquid; and a holding member that detachably supports the light transmitting member so that the one surface opposes the optical surface of the optical system main body.

Abstract: A voltage detection circuit, comprises a constant-current circuit, a current mirror circuit operated by the constant-current circuit, at least one diode-connected first transistor disposed between an output of the current mirror circuit and a detected voltage, and an output circuit outputting one logic voltage in response to a turn-on of the first transistor when the detected voltage is a predetermined voltage or higher, and outputting the other logic voltage in response to a turn-off of the first transistor when the detected voltage is lower than the predetermined voltage.

Abstract: In the invention, pairs of output transistors are provided. An actuator having an inductance is connected to nodes formed between the pairs of output transistors. A drive circuit for the actuator is arranged such that the actuator is driven by causing a drive current to flow into the inductance. The drive circuit has an overvoltage detection circuit for detecting whether or not a voltage appearing at the nodes of the output transistor pairs exceeds a supply voltage by a first predetermined level and whether or not the voltage becomes lower than a ground level by a second predetermined level. Output transistors connected to the nodes are activated by an output from the overvoltage detection circuit.

Abstract: In the invention, pairs of output transistors are provided. An actuator having an inductance is connected to nodes formed between the pairs of output transistors. A drive circuit for the actuator is arranged such that the actuator is driven by causing a drive current to flow into the inductance. The drive circuit has an overvoltage detection circuit for detecting whether or not a voltage appearing at the nodes of the output transistor pairs exceeds a supply voltage by a first predetermined level and whether or not the voltage becomes lower than a ground level by a second predetermined level. Output transistors connected to the nodes are activated by an output from the overvoltage detection circuit.

Abstract: A brushless sensorless motor driving circuit for driving a motor having a rotatable rotor and a plurality of excitation coils in which a motor starting mode may be smoothly switched to a normal driving mode so as to reduce a fluctuation in a starting time. The sensorless motor driving circuit includes a detection circuit for detecting a generated induction voltage from the excitation coils; a phase-locked loop circuit for generating a clock pulse; a delay pulse generating circuit for generating a delay pulse based on the clock pulse; a switching signal generating circuit for generating conduction switching signals in accordance with the delay pulse and an output signal from the detection circuit for causing an excitation pattern of the excitation coil to be switched to another excitation pattern; and starting pulse inserting circuits for inserting a starting pulse based on the clock pulse in the detection circuit when the induction voltage is not generated.