Pin Type Piezoelectric Sounders: Precautions When Removing Foreign Objects with an Air Blower | Precautions for use of Sound Components

Guidelines concerning the mounted sounder

Applicable Series: PKM Series (PIN type)

Avoid having the piezoelectric sounder in any area where foreign objects will be blown away using compressed air.

This may cause deformation of the piezoelectric sounder or cracking of the piezoelectric ceramic, resulting in unstable sound.

How the failure occurs

The piezoelectric sounder produces sound waves from the oscillation of the piezoelectric diaphragm, via the sound emission holes in the acoustic housing, so it is not sealed from the environment.
Due to this construction, when compressed air is blown onto the piezoelectric sounder, the air pressure is applied from the sound emission hole to the piezoelectric diaphragm, which may cause the following failures to occur.

The piezoelectric diaphragm becomes deformed.	In the acoustic housing, where the pin contact method is used to withdraw the electrode, deformation may produce poor contact. At the same time, as a result of the change in the electrical characteristics of the piezoelectric diaphragm, the sound generating condition may change, preventing normal operation.
The piezoelectric ceramic becomes damaged.	The damage will cause silver migration and a decrease in the drive area of the piezoelectric diaphragm, which may cause failures to occur.
The casing and the rear cover are pulled off.	There is no acoustic housing thus no the sound pressure level will be zero.

Cause

Case

Deformed diaphragm

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Sound Components (Buzzer)Pin Type Piezoelectric Sounders: Precautions When Removing Foreign Objects with an Air Blower

Guidelines concerning the mounted sounder

How the failure occurs

Cause

Case

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