PROBLEM TO BE SOLVED: To suppress a conductor pin of a feedthrough from falling down even when the conductor pin is made of soft metal material and a diameter of the conductor pin is formed relatively small.SOLUTION: A feedthrough comprises: a ceramic body having one principal surface and another principal surface and provided with penetration holes having openings on both surfaces conductor pins each of which is inserted into the penetration hole and parts thereof are projected out from both holes and bonding bodies each of which is arranged in a gap between the inner surface of the penetration hole and the conductor pin for bonding the ceramic body and the conductor pin together. The ceramic body has a protrusion part on at least one of the one principal surface and the other principal surface, and when the projected part of the conductor pin from the principal surface provided with the protrusion part is bent from the base and tilted toward the protrusion part, the projected part abuts to the protrusion part. Further, at least a part of the side surface of the projected part is free from being opposed to the side surface of the protrusion part over the entire length direction of the projected part.COPYRIGHT: (C)2015,JPO&INPIT【課題】フィードスルーの導体ピンに軟らかい金属材料を用いた場合や、導体ピンの直径を比較的小さくした場合でも、導体ピンの倒れこみを抑制する。【解決手段】一方主面と他方主面とを備え、双方に開口を有する貫通孔を備えたセラミック体と、前記貫通孔に挿通されて双方から一部が突出した金属からなる導体ピンと、前記貫通孔の内面と前記導体ピンとの間隙に配置されて前記セラミック体と前記導体ピンとを接合する接合体とを備えたフィードスルーであって、前記セラミック体は、前記一方主面および前記他方主面の少なくともいずれか一方に凸部を有し、前記導体ピンの前記凸部が設けられた側の主面からの突出部分を、根元から折り曲げて前記凸部に向けて倒した場合に、前記突出部分が前記凸部に当接するとともに、前記突出部分の側面の少なくとも一部は、前記突出部分の長さ方向の全体にわたって、前記凸部の側面に対向せずに開放されていることを特徴とする。【選択図】図1
