| 摘要 |
PROBLEM TO BE SOLVED: To provide a laminated piezoelectric transformer which is small in mechanical vibration energy loss, adjustable over a wide range of a transformation ratio without increasing the volume, and takes advantage of a radial- direction symmetrical vibration mode. SOLUTION: A piezoelectric ceramic disk 1 is 10 mm or so in diameter and 1 mm or so in thickness. An area ratio of an input electrode 2 and an output electrode 3 provided to the surfaces of the piezoelectric ceramic disk 1 to the surface area of the piezoelectric ceramic disk 1 is set at 18% and 72%. Twelve pieces of piezoelectric ceramic disks, which are each polarized in a thicknesswise direction, are laminated in a thicknesswise direction and bonded together. Lead wires 6 and 7 are each connected to the input sides and output sides of the twelve piezoelectric ceramic disks. A maximum efficiency 94% of a laminated piezoelectric transformer is obtained in a frequency range of 450 to 470 kHz. A load of 50Ωis used for making a load match the transformer.
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