PROBLEM TO BE SOLVED: To provide a multilayer piezoelectric material, an ultrasonic probe and an ultrasonic diagnostic equipment which can improve the sensitivity in a high frequency component while using a band widely.SOLUTION: In a multilayer piezoelectric material 1120, a piezoelectric material comprising an inorganic material as a main component is laminated in 4n layers with four layers of piezoelectric materials of 1121, 1122, 1123 and 1124 taken as one unit, and the multilayer piezoelectric material resonates at a mλ/2 resonance mode generated due to the thickness expansion/contraction of the piezoelectric material. Each piezoelectric material has a remanent polarization in the thickness direction. The multilayer piezoelectric material 1120 is laminated so that the direction of an electric field when a voltage is applied and the direction of the remanent polarization face each other in only one of the four layers of the piezoelectric materials 1121, 1122, 1123 and 1124 in one unit while the directions coincide with each other in the other three, or coincide with each other in only one of the four layers of the piezoelectric materials 1121, 1122, 1123 and 1124 in one unit while the directions face each other in the other three.COPYRIGHT: (C)2013,JPO&INPIT【課題】高周波成分における感度を向上させるとともに、帯域を広く利用することができる積層圧電体、超音波探触子及び超音波診断装置を提供する。【解決手段】積層圧電体1120は、無機材料を主成分とする圧電体が4層の圧電体1121,1122,1123,1124を1単位として4n層に積層され、圧電体の厚み伸縮によって生じるmλ/2共振モードで共振する。圧電体は、それぞれ厚み方向に残留分極を有する。積層圧電体1120は、電圧が印加されたときの電界の向きと、残留分極の向きとが、1単位中の4層の圧電体1121,1122,1123,1124のうち1つのみが対向して他の3つが一致する関係、又は、1単位中の4層の圧電体1121,1122,1123,1124のうち1つのみが一致して他の3つが対向する関係となるように圧電体を積層している。【選択図】図15
