Abstract: There is provided a piezoelectric transformer capable of not only operating at low frequencies and realizing the reduction in size but also decreasing the required mounting area and improving the productivity. Lead wires (18), (20) and (22) are respectively connected to external electrodes (14), (14) and (16) with a conductive resin, and the primary-side end of a baked piezoelectric element (12) is attached to a fixing resin (24) with an adhesive (26). In this condition, the application of a driving voltage to the lead wires (18) and (20) connected to the external electrodes (14) produces mechanical vibrations in the primary side due to an electro-mechanical coupling action of the baked piezoelectric element (12). When these mechanical vibrations are transmitted to the secondary side, an output voltage is generated due to a mechano-electrical coupling action and it is delivered from the lead wire (22) connected to the secondary-side external electrode (16).

Abstract: A reduction-reoxidation type semiconductor ceramic capacitor according to the first invention includes: semiconductor ceramic; a reoxidated dielectric layer formed on the surface of the semiconductor ceramic; at least a pair of electrodes formed on the reoxidated dielectric layer; one of the electrodes being formed with an electrical conductor containing one kind or more of metals or metal compounds selected from Zn, Al, Ni, and Sn; one kind or more of metals in extremely small quantities selected from the metals being diffused into the interior of a portion, in contact with said electrode, of the reoxidated dielectric layer.In addition, a method of manufacturing of the reduction-reoxidation type semiconductor ceramic capacitor comprising the steps of: rendering the semiconductor ceramic to a heat treatment at temperature of from 950.degree. to 1200.degree. C.