Multiple receiving electrodes are mounted to a movable part of the medical diagnostic device with contacting boundary surfaces of the receiving electrodes to each other without overlapping the receiving electrodes with each other, and a position of the obstruction is detected from the output of the electrostatic capacitance converting means. 複数の受信電極を隣接する受信電極同士が重なることなくこれらの受信電極の境界面を接しさせて医用診断装置の可動部に取り付け、該静電容量変換手段の出力から前記障害物の位置を検出する。 - 特許庁