PROBLEM TO BE SOLVED: To surely prevent the generation of an electric shock caused by a users touch with a column plate without using an expensive capacitor and a high resistance resistor whose electric resistance is reduced by dew condensation water, and to maintain the vicinity of the column plate at a uniform AC electric field while securing extremely-high safety.SOLUTION: A refrigerator-freezer includes an electrode 2 for generating an AC electric field in the refrigerator-freezer and an AC power supply 3 connected to the electrode 2 and maintains the inside of the refrigerator-freezer at the AC electric field by applying an AC voltage supplied from the AC power supply 3 to the electrode 2. The refrigerator-freezer generates the AC electric field in its inside by means of the electrode 2 by setting one output terminal 3a of the AC power supply 3 to an open state that the terminal is not connected to anywhere and connecting only the other output terminal 3b to the electrode 2.COPYRIGHT: (C)2013,JPO&INPIT【課題】高価なコンデンサーや結露水で電気抵抗が低下する高抵抗な抵抗器を使用することなく、ユーザーが棚板に接触して起こす感電を確実に防止する。極めて高い安全性を確保しながら、棚板の近傍を均一な交流の電場にする。【解決手段】冷凍冷蔵庫は、冷凍冷蔵庫内に交流の電場を発生させる電極2と、この電極2に接続してなる交流電源3とを備えており、交流電源3から供給される交流電圧を電極2に印加して、冷凍冷蔵庫内を交流の電場としている。冷凍冷蔵庫は、交流電源3の片方の出力端子3aを、どこにも接続しないオープン状態として、他方の出力端子3bのみを電極2に接続して、電極2で庫内に交流の電場を発生させている。【選択図】図3
