PROBLEM TO BE SOLVED: To provide an ultrasonic transducer having air bubbles uniformly scattered in a joint material filled in narrow grooves, and to provide an ultrasonic probe and an ultrasonic imaging apparatus including the ultrasonic transducer.SOLUTION: An ultrasonic transducer comprises: a piezoelectric body grooves which partition the piezoelectric body into elements and a joint material which is filled in the grooves. The joint material includes air bubbles, and average porosity of the joint material in the ultrasonic transducer is 10% or more. Furthermore, variations of porosity in any region at a depth of 40 μm of the grooves are within ±15% with respect to the average porosity.SELECTED DRAWING: Figure 13COPYRIGHT: (C)2017,JPO&INPIT【課題】狭い溝であっても目地材中に気泡がより均等に存在する超音波振動子、それを有する超音波探触子および超音波撮像装置を提供する。【解決手段】本発明に係る超音波振動子は、圧電体と、当該圧電体を素子単位に区画する溝と、当該溝内に充満する目地材とを有する。当該目地材は気泡を含み、当該目地材の上記超音波振動子における平均空隙率は10%以上である。加えて、上記溝における深さ40μmの任意の領域の空隙率の上記前記平均空隙率に対するばらつきは、±15%以内である。【選択図】図13
