Patent ID: 7081629

Claim:
A radiographic apparatus comprising: a plurality of pixels arrayed in a row direction and in a column direction, and each including a conversion element that converts incident radiation into an electrical signal and a first switch element that transfers the electrical signal; a plurality of control interconnections each connected to each of the plurality of switch elements arrayed in the row direction; a plurality of signal interconnections each connected to each of the plurality of switch elements arrayed in the column direction; a driving circuit section connected to the plurality of control interconnections, and supplying driving signals to the plurality of control interconnections; and a read circuit section which is connected to the plurality of signal interconnections and reads the electrical signal from said conversion element for each row, wherein said read circuit section comprises a current integration type operational amplifier at a first stage, said operational amplifier comprises, between an inverting terminal and an output terminal, a capacitive element to integrate the electrical signal transferred from said conversion element through said first switch element and a second switch element to reset said capacitive element, and said operational amplifier comprises, at a noninverting terminal, a bias supply device which selectively supplies at least two biases comprising a first bias and a second bias, a refresh device which refreshes each row by applying the first bias to said conversion element read-accessed by using said first switch element and said second switch element, and a reset device which executes reset by applying the second bias to said capacitive element by using said second switch element.