Patent ID: 8155363

Claim:
An electrical horn comprising: a horn housing; an oscillation member fixed to the horn housing to generate a sonic wave; and a resonance tube in which the sonic wave generated by the oscillation member flows, wherein the resonance tube has a plurality of sonic outlet portions that are open in different directions, the oscillation member is an oscillation plate member located between the horn housing and a cover member that is spaced from the oscillation plate member to be approximately parallel with the oscillation plate member, the resonance tube includes a scroll portion defining a sonic passage between the cover member and a parallel wall portion extending approximately in parallel with the cover member, and a trumpet portion continuously extending from the scroll portion to define the sonic passage, a passage sectional area of the sonic passage of the scroll portion is gradually increased toward downstream, and a passage sectional area of the sonic passage of the trumpet portion is rapidly increased, the trumpet portion has an orthogonal wall surface that extends from the parallel wall portion approximately perpendicularly to a surface of the parallel wall portion to define the sonic passage, and at least two of the sonic outlet portions are open in the trumpet portion to face in different directions.