Vehicle presence notification apparatus

摘要

An ultrasonic generation element provides a primary resonance portion existing in an ultrasonic frequency band, and is caused to perform only a notice sound generation by parametric speaker. An audible-sound generation piezoelectric speaker provides a primary resonance portion existing in an audible frequency band, and is caused to switch between a notice sound generation by dynamic speaker and a notice sound generation by parametric speaker, based on vehicular information. Under a predetermined low vehicle speed, a notice sound is generated in both (i) an area ahead of a vehicle and distant from the vehicle, and (ii) an area surrounding the vehicle. When the vehicle speed increases, a notice sound is generated at a position ahead of the vehicle and more distant from the vehicle.

主权项

1. A vehicle presence notification apparatus that generates a notice sound in an area outside of a vehicle when a driving condition to report a presence of the vehicle is satisfied, the vehicle presence notification apparatus comprising:
an audible-sound generation piezoelectric speaker that provides a primary resonance portion existing in an audible frequency band, wherein:
when vehicular information satisfies a predetermined first condition, the vehicular information being a travel state of the vehicle, the audible-sound generation piezoelectric speaker is caused to perform an audible notice sound direct generation to generate directly a notice sound that is audible;when the vehicular information satisfies a predetermined second condition, the audible-sound generation piezoelectric speaker is caused to perform an ultrasonic emission to emit an ultrasonic wave that is prepared by applying an ultrasonic modulation to a signal to form a notice sound; andwhen a vehicle speed of the vehicle is less than a predetermined value, the vehicular information satisfies the predetermined first condition, whereaswhen the vehicle speed of the vehicle is equal to or greater than the predetermined value, the vehicular information satisfies the predetermined second condition.