Abstract: A method for manufacturing a package structure includes providing a carrier board; providing at least one die having a top surface, a bottom surface, and a side surface on the carrier board; and forming a protective layer to cover at least a portion of the side surface of the die. The die includes a substrate, a semiconductor layer, a gate structure, a source structure and a drain structure, at least one dielectric layer, and at least one pad. The semiconductor layer is disposed on the substrate. The gate structure is disposed on the semiconductor layer. The source and the drain structures are disposed on opposite sides of the gate structure. The dielectric layer covers the gate, source, and drain structures. The pad is disposed on the dielectric layer and penetrates through the dielectric layer to electrically contact with the gate, source or drain structure.

Abstract: The invention relates to a method for fabricating piezoelectric composite material comprising steps of mixing a piezoelectric ceramic powder, an adhesive, a cross-linking agent, a lubricant and a plasticizer to form a slurry; extruding the slurry to form a piezoelectric ceramic green fiber; sintering the piezoelectric ceramic green fiber to form the piezoelectric ceramic fiber; arranging the piezoelectric ceramic fiber in a mold according to a predetermined volumetric content; and adding a polymer into the mode to form a polymer matrix of piezoelectric composite material. A piezoelectric power generating device including a piezoelectric power generating element made of the piezoelectric composite material is also provided.

Abstract: A piezoceramic transducer (PZT transducer) and a method for manufacturing the same are provided. The PZT transducer includes a piezoceramic substrate and an electrode unit. The piezoceramic substrate has a first surface and a second surface opposite the first surface, and has a mechanical quality factor (Qm) greater than 1400. The electrode unit has a first electrode and a second electrode. The first electrode is disposed on the first surface and has a first diameter. The second electrode covers the second surface and extends to cover a part of the surface at a periphery of the first surface, and the part of the second electrode covering the second surface has a second diameter. The ratio of the first diameter to the second diameter is 0.498 to 0.502. The PZT transducer has a large mist amount and a long service life.

Abstract: A piezoceramic transducer (PZT transducer) and a method for manufacturing the same are provided. The PZT transducer includes a piezoceramic substrate and an electrode unit. The piezoceramic substrate has a first surface and a second surface opposite the first surface, and has a mechanical quality factor (Qm) greater than 1400. The electrode unit has a first electrode and a second electrode. The first electrode is disposed on the first surface and has a first diameter. The second electrode covers the second surface and extends to cover a part of the surface at a periphery of the first surface, and the part of the second electrode covering the second surface has a second diameter. The ratio of the first diameter to the second diameter is 0.498 to 0.502. The PZT transducer has a large mist amount and a long service life.

Abstract: A piezoelectric buzzer includes a housing unit, a buzzer unit, and first and second terminals. The housing unit includes first and second housings coupled together. The second housing includes a base plate and a pair of spaced apart insert seats, each of which protrudes inwardly from the base plate toward the first housing and is formed with an insert hole. The buzzer unit is disposed in the resonant chamber and includes a vibrating plate and a piezoelectric plate attached to the vibrating plate. The first and second terminals are inserted respectively into the insert holes of the insert seats, and have a respective connection section extending outwardly of the housing unit, and a respective extending section abutting against a respective one of the vibrating plate and the piezoelectric plate.

Abstract: A piezoelectric buzzer includes a housing unit, a buzzer unit, and first and second terminals. The housing unit includes first and second housings coupled together. The second housing includes a base plate and a pair of spaced apart insert seats, each of which protrudes inwardly from the base plate toward the first housing and is formed with an insert hole. The buzzer unit is disposed in the resonant chamber and includes a vibrating plate and a piezoelectric plate attached to the vibrating plate. The first and second terminals are inserted respectively into the insert holes of the insert seats, and have a respective connection section extending outwardly of the housing unit, and a respective extending section abutting against a respective one of the vibrating plate and the piezoelectric plate.