Abstract: Provided is an optical information recording medium employing an In-Groove recording system, and having a preferable recording characteristic with a high modulation degree and low jitter characteristics. The medium is comprised of a circular-disk shaped substrate 2 having a through hole at a center portion thereof and a spiral guide groove 3 on one surface thereof; a reflective layer 4 formed on the guide groove 3 of the substrate 2; a recording layer 5 formed on the reflective layer 4 and composed of an organic material including a dye; a protection layer 6 provided on the recording layer 5; and a light-transmissive layer 6 formed on the protection layer 6. The recording layer 5 includes an organic dye which is an azo metal complex compound having a structure represented by (Chemical formula 1) and a functional group represented by (Chemical formula 2).

Abstract: Disclosed is an optical information recording medium whose recording method is In-Groove recording, wherein such optical information recording medium offers good recording characteristics associated with high modulation degree and low jitter characteristics. This optical information recording medium includes: a disc-shaped substrate 2 having a through hole at the center and a guide groove 3 formed helically on one side; a reflective layer 4 formed on top of the aforementioned guide grooves 3 on the aforementioned substrate 2; a recording layer 5 formed on top of the aforementioned reflective layer 4 and made of an organic substance containing dye; a protective layer 6 formed on top of the aforementioned recording layer 5; and a light transmissive layer 6 formed on top of the aforementioned protective layer 6. The recording layer 5 contains an organic dye having a structure expressed by (Chemical Formula 1) and a functional group expressed by (Chemical Formula 2).

Abstract: An electronic circuit device includes a case and a cover between which a space is defined, electronic circuit parts arranged in the space, and a sealant to seal the electronic circuit parts. The case has a bottom face, a side wall, and an opening face opposing to the bottom face. The cover is located inside of the side wall so as to close the opening face of the case. The cover has a filling port through which the sealant is filled. The cover has a top face located approximately equal to an end face of the side wall, or adjacent to the bottom face relative to the end face of the side wall.

Abstract: A mobile object includes a wall member to which an ultrasonic sensor is fixed. The wall member has a through hole through which an oscillating face of the ultrasonic sensor is exposed from the wall member. A closing member closes a gap generated between the wall member and the ultrasonic sensor. The closing member connects an edge of the through hole located outside of the wall member and an edge of the oscillating face of the ultrasonic sensor. The closing member has an outer face exposed from the wall member, and the outer face of the closing member has asperities.

Abstract: An ultrasound sensor for a vehicle has a housing which is fixedly arranged at a vehicle inner side of a periphery member of the vehicle, an ultrasound vibrator for sending and receiving ultrasound, and an ultrasound transferring member which is constructed of a different material from that of the housing to have an acoustic impedance with a medium value between an acoustic impedance of the ultrasound vibrator and that of the periphery member. The ultrasound vibrator is accommodated in the housing and fixed to an end portion of the housing, which faces the periphery member. The ultrasound transferring member is arranged at the end portion of the housing, and contacts both the ultrasound vibrator and the periphery member of the vehicle.

Abstract: An ultrasound sensor for a vehicle has a housing which is fixedly arranged at a vehicle inner side of a periphery member of the vehicle, an ultrasound vibrator for sending and receiving ultrasound, and an ultrasound transferring member which is constructed of a different material from that of the housing to have an acoustic impedance with a medium value between an acoustic impedance of the ultrasound vibrator and that of the periphery member. The ultrasound vibrator is accommodated in the housing and fixed to an end portion of the housing, which faces the periphery member. The ultrasound transferring member is arranged at the end portion of the housing, and contacts both the ultrasound vibrator and the periphery member of the vehicle.

Abstract: An ultrasonic sonar has a transceiver equipped with an ultrasonic oscillator. An ultrasonic wave is transmitted from the transceiver. The ultrasonic wave reflected from an obstacle is received by the ultrasonic oscillator to detect the obstacle. The transmission frequency of the ultrasonic wave is set to be different from the reverberation frequency. When the obstacle is detected, a microcomputer converts the analog signal received by the ultrasonic oscillator into a digital signal, performs a frequency transform of this signal by Fourier transform to extract only the transmission frequency component, and performs an inverse transform.

Abstract: An obstacle detecting system for vehicles has an ultrasonic vibrator having a vibration plate and mounted on a vehicle to transmit and receive an ultrasonic wave. An obstacle is detected in response to an output signal of the ultrasonic vibrator. When the temperature around the ultrasonic vibrator is below a predetermined temperature corresponding to snowfall, the system calculates a ratio of a period of reverberating vibration of the ultrasonic vibrator relative to a predetermined time period following an ultrasonic wave transmission, and determines accumulation of snow when the calculated ratio exceeds a predetermined time ratio. The system notifies an abnormality of the ultrasonic vibrator arising from the accumulation of snow.

Abstract: An ultrasonic sensor has a sensor body, a diaphragm, and a vibrator for generating ultrasonic and attached to the diaphragm. The diaphragm has a thinnest portion. The thinnest portion has a predetermined thickness by which reverberation of the diaphragm is restrained. The reflected ultrasonic can be detected correctly by this construction of the sensor.

Abstract: An obstacle detecting system for vehicles has an ultrasonic vibrator having a vibration plate and mounted on a vehicle to transmit and receive an ultrasonic wave. An obstacle is detected in response to an output signal of the ultrasonic vibrator. When the temperature around the ultrasonic vibrator is below a predetermined temperature corresponding to snowfall, the system calculates a ratio of a period of reverberating vibration of the ultrasonic vibrator relative to a predetermined time period following an ultrasonic wave transmission, and determines accumulation of snow when the calculated ratio exceeds a predetermined time ratio. The system notifies an abnormality of the ultrasonic vibrator arising from the accumulation of snow.

Abstract: An ultrasonic sonar has a transceiver equipped with an ultrasonic oscillator. An ultrasonic wave is transmitted from the transceiver. The ultrasonic wave reflected from an obstacle is received by the ultrasonic oscillator to detect the obstacle. The transmission frequency of the ultrasonic wave is set to be different from the reverberation frequency. When the obstacle is detected, a microcomputer converts the analog signal received by the ultrasonic oscillator into a digital signal, performs a frequency transform of this signal by Fourier transform to extract only the transmission frequency component, and performs an inverse transform.

Abstract: In an entering detecting system for vehicles, a received ultrasonic signal is amplified by an amplifier circuit so that a Doppler signal may be generated from an amplified signal and a transmission signal for detecting an entering of unauthorized person into a vehicle compartment. An operational amplifier circuit of the amplifier circuit has an output limiter circuit. The output limiter circuit has diode series circuits which are connected to a feedback resistor of an operational amplifier.

Abstract: An intrusion detecting apparatus for a vehicle comprises: a doppler shift signal outputting unit for outputting a doppler shift signal in response to a reflected and received ultrasonic signal from an ultrasonic receiver and a transmitted ultrasonic signal from a transmitter, an envelope detecting circuit for detecting the level of the received ultrasonic signal, and a detecting means for detecting an illegal intrusion by a person only when it is determined that the doppler shift signal is within a predetermined amount corresponding to the movement of a person intruding into the passenger compartment and it is also determined that the detected level of the received ultrasonic signal is out of a range of a disturbance, whereby an erroneous detection due to a disturbance caused by some reason other than an intrusion can be prevented.

Abstract: An intrusion detecting apparatus for a vehicle comprising an ultrasonic transmitting/receiving sensor, an intrusion detecting unit for detecting whether or not a person intrudes into a passenger compartment, based on the received signal, a stopping unit for intermittently stopping the transmission from the transmitter, and a cover detecting unit for detecting whether or not the sensor is covered, based on the signal received after stopping the transmission of the signal and, in response to a predetermined condition representing that the sensor is covered, whereby it can correctly determine whether or not the sensor is covered, improving the accuracy of the detection of an illegal intrusion of a person. At least one of a transmitter and a receiver in the sensor and the intrusion detecting unit is also intermittently operated to reduce the power consumption.