PROBLEM TO BE SOLVED: To provide a convex type ultrasonic endoscope which achieves improvement in depiction ability of a distal side of a distal hard section displayed in an ultrasonic observation image without deteriorating insertion property of an insertion section.SOLUTION: The convex type ultrasonic endoscope 2 comprises an ultrasonic vibrator section 30 having an ultrasonic transmitting and receiving section 31 and the distal hard section 16 having a treatment instrument insertion passage 24 through which a treatment instrument, such as a puncture needle 26, connected to the ultrasonic vibrator section 30 passes. An ultrasonic transmitting and receiving surface 34 arranged on a convex surface of the ultrasonic transmitting and receiving section 31 includes ultrasonic transmitting and receiving surfaces 35 and 36 of two or more kinds of curvature in the arrangement direction of the ultrasonic vibrators 37 and having piezoelectric elements. The curvature becomes smaller as the ultrasonic transmitting and receiving surfaces becomes more distant from the distal hard section 16.COPYRIGHT: (C)2010,JPO&INPIT【課題】挿入部の挿入性を損なうことなく、超音波観察画像中に表示される先端硬性部遠位側の描出能の向上を図ったコンベックス型超音波内視鏡を提供すること。【解決手段】コンベックス型超音波内視鏡2は、超音波送受信部31を有する超音波振動子部30、および超音波振動子部30と連結された例えば穿刺針26が通過する処置具挿通路24を備える先端硬性部16を備えている。超音波送受信部31の凸面側に設けられた超音波送受信面34は、圧電素子を備える超音波振動子37の配列方向に2種以上の曲率の超音波送受信面35、36を含んで構成されている。曲率は、先端硬性部16側から遠ざかるほど小さく設定されている。【選択図】図3
