Patent Number: 8,823,501

Title: Vehicle presence notification apparatus

Abstract: 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.

Inventors: Goto; Koichi (Kariya, JP)

Assignee: Denso Corporation

International Classification: B60Q 1/00 (20060101)

Expiration Date: 9/02/12018