Piezoelectric vibration device for mobile terminal

A piezoelectric vibration device for a mobile terminal, comprising:

• a bimorph piezoelectric vibrator including a pair of piezoelectric element layers connected to one of positive and negative poles and a middle electrode plate interposed between the piezoelectric element layers and connected to the other pole, the piezoelectric vibrator being configured to generate vibration due to up/down bending displacement by fixing both end portions of the piezoelectric vibrator to an inner surface of a casing of a mobile terminal;
• a voltage-boosting transformer to raise a power source voltage of a mobile terminal to a driving voltage of about 20 to about 300V;
• a driving chip to receive the raised driving voltage from the voltage-boosting transformer and drive the piezoelectric vibrator by the raised driving voltage;
• weights attached to at least one of both sides of the piezoelectric vibrator in order to amplify vibration of the piezoelectric vibrator;
• and
• insulation members to insulate both end portions of the piezoelectric vibrator from the inner surface of the casing, thereby preventing electricity applied to the piezoelectric vibrator from leaking to the casing.