Alarm sound generating apparatus
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United States of America Patent
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Nov 3, 2020
Grant Date -
Jul 23, 2020
app pub date -
Jan 16, 2020
filing date -
Jan 23, 2019
priority date (Note) -
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Abstract
An alarm sound generating apparatus includes a spiral pipe extending from a sound wave inlet to a sound wave outlet, and a cover including a reflecting wall configured to reflect a sound wave released from the sound wave outlet. The reflecting wall is distanced from and faces to the sound wave outlet. A distance between the sound wave outlet and the reflecting wall falls within ±10% of an odd multiple of one-fourth of a wavelength calculated from a fundamental frequency of the alarm sound or a multiple harmonic thereof.
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