PROBLEM TO BE SOLVED: To enable rapid charging by suppressing an influence of path resistance.SOLUTION: A charger 4 which charges a power storage body 28 embedded in a housing 21 of a radiation image photographing device 2 from the outside via connectors 26 and 42 comprises: a power source 41 for supplying power for charging a voltage detector 43 for detecting the voltage of the power storage body a current detector 44 for detecting a charging current and a charge controller 45 for performing constant-current charging until a target voltage V1 is obtained, then switching over to constant-voltage charging. The charge controller detects voltage change ΔV of the power storage body by the voltage detector when current values are changed between at least two values at the start of the constant-current charging, and controls the charging by correcting the target voltage or the voltage value detected by the voltage detector in accordance with the change amount of the voltage of the power storage body.COPYRIGHT: (C)2013,JPO&INPIT【課題】経路抵抗の影響を抑制して迅速な充電を可能とする。【解決手段】蓄電体28を筐体21の内部に内蔵する放射線画像撮影装置2にコネクタ26,42を通じて外部から蓄電体に充電を行う充電装置4であって、充電の電力を供給する電源部41と、蓄電体の電圧を検出する電圧検出部43と、充電電流を検出する電流検出部44と、目標電圧V1となるまで定電流充電を行い、次いで定電圧充電に切り換える充電制御部45とを備え、充電制御部は、定電流充電の開始時において電流値を少なくとも2値の間で変化させたときの蓄電体の電圧変化ΔVを電圧検出部により検出し、蓄電体の電圧の変化量に応じて、目標電圧又は電圧検出部の検出電圧の値を補正して充電制御を行う。【選択図】図6
