摘要:
An ultrasonic emission device is accommodated in a housing for generating an ultrasonic wave. The housing has an ultrasonic emission port for emitting the ultrasonic wave from the ultrasonic emission device outward therethrough. A louver is equipped to the ultrasonic emission port. The louver includes multiple louver boards, which are distant from each other. Two of the multiple louver boards adjacent to each other form a clearance therebetween. The clearance includes a horizontal clearance extending along a horizontal direction and an inclined clearance being an ascent inclination toward the ultrasonic emission device.
摘要:
A sound wave generator includes a speaker control circuit and a speaker. The speaker control circuit includes a signal generating unit that is configured to generate an electric signal having a humming frequency property. The humming frequency property includes a plurality of frequencies that have an overtone relationship with respect to A Hz and are pitched at the A Hz, the A Hz being a target generation frequency and corresponding to a low pitch frequency in an audible range. The speaker generates a sound wave from the electric signal by applying the electric signal to a vibration plate that produces the sound wave.
摘要:
An electromagnetic alarm device includes a current interrupter to interrupt an electricity supply to a coil on application of a self-excited voltage to oscillate a diaphragm with a moving core to generate a first alarm sound including a fundamental tone at a first predetermined frequency, when a switch is manipulated by an occupant. A proximity notification device includes an ultrasonic speaker to emit an ultrasonic wave, which is generated by implementing ultrasonic modulation on a proximity notification sound, to an outside of the vehicle for notifying a pedestrian of proximity of the vehicle, according to a traveling state of the vehicle and/or when a sensor detects a pedestrian. The ultrasonic speaker emits an ultrasonic wave, which is generated by implementing ultrasonic modulation on a second alarm sound including a fundamental tone at a second frequency, when the switch is manipulated.
摘要:
A vehicle presence notification apparatus generates a notice sound by emitting an ultrasonic wave in mid air based on an ultrasonic signal modulated according to an audible sound. During proceeding in mid air, the modulated ultrasonic wave is self-demodulating to become an audible sound. The audible sound posterior to the self-demodulation has a significant directionality like the ultrasonic wave. The notice sound is thus conveyed mainly to a pedestrian who is present in a dangerous area range where a danger needs to be taught. In addition, the vehicle presence notification apparatus includes a sensor-use ultrasonic transducer device having a transducers. The transducer device serves as a vehicle velocity sensor by transmitting an ultrasonic wave towards a road surface based on an ultrasonic wave signal or modulated ultrasonic wave, thereby enabling the vehicle presence notification apparatus to acquire vehicle velocity information by itself.
摘要:
An electromagnetic alarm device includes a current interrupter to interrupt an electricity supply to a coil on application of a self-excited voltage to oscillate a diaphragm with a moving core to generate a first alarm sound including a fundamental tone at a first predetermined frequency, when a switch is manipulated by an occupant. A proximity notification device includes an ultrasonic speaker to emit an ultrasonic wave, which is generated by implementing ultrasonic modulation on a proximity notification sound, to an outside of the vehicle for notifying a pedestrian of proximity of the vehicle, according to a traveling state of the vehicle and/or when a sensor detects a pedestrian. The ultrasonic speaker emits an ultrasonic wave, which is generated by implementing ultrasonic modulation on a second alarm sound including a fundamental tone at a second frequency, when the switch is manipulated.
摘要:
A vehicle presence alert apparatus for alerting a target object to a presence of the vehicle via an alert sound with a frequency in an audible range is disclosed. The vehicle presence alert apparatus includes: a sound emitter configured to (i) cause a carrier wave with a frequency in an ultrasonic range to carry the alert sound, and (ii) emit the carrier wave carrying the alert sound as a radiation wave toward the target object; a sound receiver configured to receive a reflected wave, the reflected wave being generated due to reflection of the radiation wave by the target object; and relative velocity calculation means for calculating a relative velocity of the target object with respect to the vehicle based on a frequency of the radiation wave and a frequency of the reflected wave.
摘要:
A vehicle existence informing device is configured to inform existence of a vehicle by using a warning sound at a frequency in an audible range. A speaker array includes at least two speakers arranged so that oscillation directions of oscillators of the at least two speakers substantially coincide with each other. The speaker array is configured to radiate a warning sound in air on a carrier wave, which is at a frequency in an ultrasonic range. A phase control unit is configured to advance and delay a phase of a sound wave radiated from one of the at least two speakers with respect to a phase of a sound wave radiated from another of the at least two speakers.
摘要:
A vehicle presence alert apparatus for alerting a target object to a presence of the vehicle via an alert sound with a frequency in an audible range is disclosed. The vehicle presence alert apparatus includes: a sound emitter configured to (i) cause a carrier wave with a frequency in an ultrasonic range to carry the alert sound, and (ii) emit the carrier wave carrying the alert sound as a radiation wave toward the target object; a sound receiver configured to receive a reflected wave, the reflected wave being generated due to reflection of the radiation wave by the target object; and relative velocity calculation means for calculating a relative velocity of the target object with respect to the vehicle based on a frequency of the radiation wave and a frequency of the reflected wave.
摘要:
A vehicle existence informing device is configured to inform existence of a vehicle by using a warning sound at a frequency in an audible range. A speaker array includes at least two speakers arranged so that oscillation directions of oscillators of the at least two speakers substantially coincide with each other. The speaker array is configured to radiate a warning sound on a carrier wave, which is at a frequency in an ultrasonic range, to an air. A phase control unit is configured to advance and delay a phase of a sound wave radiated from one of the at least two speakers with respect to a phase of a sound wave radiated from an other of the at least two speakers.
摘要:
An intermediate resin molded body is put between two outer resin molded bodies, and a molten resin is injected substantially simultaneously into a first interface between one outer resin molded body of the two outer resin molded bodies and the intermediate resin molded body and a second interface between the other outer resin molded body and the intermediate resin body, so that the two outer resin molded bodies and the intermediate resin molded body are welded together.