| 摘要 |
A vehicle approach notification unit is disposed in a vehicle for producing a notification sound. The vehicle approach notification unit has a speaker and a thin film. The speaker is disposed to a sound tube of a vehicle horn of the vehicle. The vehicle horn produces a resonant warning sound with a resonant frequency. The thin film partitions a space between the speaker and the sound tube. The speaker emits the notification sound into the sound tube so that the notification sound is emitted outside of the vehicle via the sound tube. The thin film restricts a sound wave having the resonant frequency from being transmitted, and allows a sound wave having a frequency producing the notification sound to be transmitted. |
