| 摘要 |
PROBLEM TO BE SOLVED: To improve breakdown voltage and reliability by adjusting the thickness of a dielectric and laminating it, so that the breakdown voltages of respective dielectric are substantially uniform. SOLUTION: A laminated body 2 is comprised of three kinds of dielectrics 6 (A, B, C), which are made of various dielectric materials (A', B', C') differing in the temperature properties of permittivities and inner electrodes 7 (7a-7d) formed respectively on one surfaces of the dielectrics A, B and C. The dielectric material A' of the dielectric A, for example, is 0.35PNN-0.65PMN, the dielectric material B' of the dielectric B is 0.95PMN-0.05PT, and the dielectric material C' of the dielectric C is 0.85PMN-0.15PT. (PNN: is Pb(Ni1/3Nb2/3)O3; PMN is Pb(Mg1/3Nb2/3)O3, and PT is PbTiO3). The film thickness of the respective dielectrics A, B and C after baking is about 20 to 40μm per layer, and it is adjusted so that the breakdown voltages are substantially uniform.
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