Patent ID: 9474508
Filing Date: 2016-10-25
CPC Classification: A61B,B06B

Claim Text:
1. An ultrasonic transducer comprising: a substrate including a plurality of openings, each of the openings being spaced apart from each other as viewed in a thickness direction of the substrate; a supporting film that covers the plurality of openings; a piezoelectric body disposed on the supporting film at the plurality of openings; and an electric connection connected to the piezoelectric body, the plurality of openings including “m” first openings, where “m” represents a number of the first openings and is an integer of 1 or more, each of the first openings having a first opening area covered with the supporting film on a surface of the substrate, the plurality of openings including “n” second openings, where “n” represents a number of the second openings and is an integer larger than the “m” number, each of the second openings having a second opening area that is smaller than the first opening area, the piezoelectric body including “m” first piezoelectric bodies, which overlap with the first openings in the thickness direction of the substrate, respectively, are formed corresponding to the “m” first openings, and are electrically connected in series with respect to each other when the “m” that is the number of the first openings and a number of the first piezoelectric bodies is an integer of 2 or more, and including “n” second piezoelectric bodies, which overlap with the second openings in the thickness direction of the substrate, respectively, are formed corresponding to the “n” second openings, and are electrically connected in series with respect to each other, the electric connection including a first electric connection and a second electric connection which is electrically disconnected from the first electric connection, the first electric connection electrically connecting the first piezoelectric bodies in series to each other, the second electric connection electrically connecting the second piezoelectric bodies in series to each other, wherein a total area of the first openings is “A” and a total area of the second openings is “B” and a ratio B/A is within the range of 0.9 to 1.1.