AUDIBLE ALARM DEVICE AND FIRE ALARM SYSTEM INCLUDING THE SAME
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United States of America Patent
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Issued Date -
Aug 4, 2011
app pub date -
Jan 24, 2011
filing date -
Jan 29, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Provided is an audible alarm device including a piezoelectric buzzer, which is capable of suppressing wasted current consumption not contributing to increased sound pressure of the piezoelectric buzzer. The audible alarm device includes: a piezoelectric buzzer; a coil connected in parallel to the piezoelectric buzzer; a current limiting means for adjusting a current supply period for the piezoelectric buzzer and the coil, and limiting a current to the coil during current supply; and a control circuit for controlling on/off time of the current limiting means.
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