Sound vibration sensor using piezoelectric element having cantilever structure

A sound vibration sensor using a piezoelectric element having a cantilever structure, the sound vibration sensor comprising:

• a housing forming an exterior;
• two or more piezoelectric elements having different thicknesses and having a cantilever structure installed in the housing, wherein upper surfaces of the two or more piezoelectric elements are coplanar;
• a support structure supporting fixed ends of the two or more piezoelectric elements;
• two or more weights each weight attached to a free end of one of the two or more piezoelectric elements;
• and
• an energizing part configured to transmit an output from the two or more piezoelectric elements,
• wherein the sound vibration sensor comes into contact with a speaker's body, receives a voice vibration of the speaker's body generated when the speaker's body utters a sound through the housing, and amplifies the voice vibration by the free end of each of the two or more piezoelectric elements to detect the voice vibration of the speaker using a piezoelectric characteristic of the two or more piezoelectric elements.