Piezoelectric sounder device
AssigneeDräger Safety AG & Co. KGaA
InventorMark Winship
Life of this patent
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Abstract
A piezo sounder device 100 comprising a piezo sounder 110 and a controller 120, wherein the controller 120 is configured, upon activation of the piezo sounder device 100, to drive the piezo sounder 110 at: a first frequency substantially corresponding to a resonant frequency of the piezo sounder 110 at a first operational temperature; and a second frequency substantially corresponding to a resonant frequency of the piezo sounder 110 at a second operational temperature. Also disclosed is a method 200 of manufacturing the device 100, and a method 300 of emitting a sound 400, 500.
Claims15
A piezo sounder device comprising a piezo sounder and a controller, wherein the controller is configured, upon activation of the piezo sounder device, to drive the piezo sounder at:
- a first frequency for a first duration, the first frequency substantially corresponding to a resonant frequency of the piezo sounder at a first operational temperature;
- and
- a second frequency for a second duration, the second frequency substantially corresponding to a resonant frequency of the piezo sounder at a second operational temperature, wherein the first duration is different from the second duration.
A breathing apparatus comprising a piezo sounder device, the piezo sounder device comprising a piezo sounder and a controller, wherein the controller is configured, upon activation of the piezo sounder device, to drive the piezo sounder at:
- a first frequency for a first duration, the first frequency substantially corresponding to a resonant frequency of the piezo sounder at a first operation temperature;
- and
- a second frequency for a second duration, the second frequency substantially corresponding to a resonant frequency of the piezo sounder at a second operational temperature, wherein the first duration is different from the second duration.
A method of manufacturing a piezo sounder device comprising a piezo sounder and a controller, the method comprising:
- characterising the piezo sounder at a first operational temperature to determine a first frequency substantially corresponding to a resonant frequency of the piezo sounder at the first operational temperature;
- configuring the controller to drive the piezo sounder at the first frequency for a first duration when the piezo sounder device is activated;
- and
- configuring the controller to drive the piezo sounder at a second frequency for a second duration when the piezo sounder device is activated, the second frequency substantially corresponding to a resonant frequency of the piezo sounder at a second operational temperature,
- wherein the first duration is different from the second duration.
A method of emitting a sound by a piezo sounder device, the piezo sounder device comprising a piezo sounder and a controller, the method comprising:
- driving, by the controller, the piezo sounder at a first frequency for a first duration, the first frequency substantially corresponding to a resonant frequency of the piezo sounder at a first operational temperature;
- and
- driving, by the controller, the piezo sounder at a second frequency for a second duration, the second frequency substantially corresponding to a resonant frequency of the piezo sounder at a second operational temperature, wherein the first duration is different from the second duration.
Dependencies are inferred from the claim text.