Audible alarm device and fire alarm system including the same

Details Audible alarm device and fire alarm system including the same Audible alarm device and fire alarm system including the same

G - Physics

08

B

G08B 3/10 (2006.01) G08B 17/00 (2006.01)

Patent

CA 2728828

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 (32); a coil (33) connected in parallel to the piezoelectric buzzer (32); a current limiting means (34) for adjusting a current supply period for the piezoelectric buzzer (32) and the coil (33), and limiting a current to the coil (33) during current supply; and a control circuit (31) for controlling on/off time of the current limiting means (34).

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