Patent ID: 8395303

Claim:
A piezoelectric transformer comprising: a piezoelectric substrate comprising a pair of main surfaces having a rectangular shape, a longitudinal direction, an area, and a center portion; an output part at the center portion of the piezoelectric substrate in the longitudinal direction of thereof, comprising a pair of output electrodes on both the main surfaces a longitudinal direction, and sides; a first input part and a second input part on each side of the output part in the longitudinal direction respectively, each comprising input electrodes on both the main surfaces, wherein the input electrodes of each of the first input part and the second input part opposing each other on both the main surfaces of the piezoelectric substrate, and at least one of the opposing input electrodes is a partial electrode having an area smaller than the area of the main surface of the piezoelectric substrate in the first input part and the second input part, wherein the main surface of the piezoelectric substrate in the first input part and the second input part includes a central portion and an end, and at least one of the input electrodes opposing each other includes a center electrode in the central portion of the main surface of the piezoelectric substrate in the first input part and the second input part, and an end electrode on the end of the main surface.