Laminated piezoelectric transformer

A piezoelectric transformer comprising:

• a laminated body having an output part and one or more input parts;
• and
• external electrodes,
• wherein the output part includes sheets formed of a first piezoelectric material and first internal electrodes, each of the first internal electrodes being formed between every two neighboring sheets of the first piezoelectric material and the first internal electrodes being alternatively exposed at first two substantially opposite sides of the laminated body and
• wherein each of the input parts includes sheets formed of a second piezoelectric material and second internal electrodes, each of the second internal electrodes is formed between every two neighboring sheets of the second piezoelectric material and the second internal electrodes are alternately exposed at second two substantially opposite sides of the laminated body, and
• wherein the external electrodes are separated from each other and formed on first and second side surfaces, and
• wherein a piezoelectric strain constant of the second piezoelectric material is greater than that of the first piezoelectric material to enhance an output power thereof.