Patent ID: 7349133

Claim:
An image reading apparatus that scans a document, the image reading apparatus including an LED array in which a plurality of LED blocks are arranged in parallel and a drive control unit which performs constant-voltage drive control on the LED array, each of the plurality of LED blocks including a plurality of LEDs connected in series, the image reading apparatus comprising: a current-detecting unit configured to detect a value of current running in the LED array; a determining unit configured to compare a current value detected by the current-detecting with a predetermined current threshold and to determine permission or prohibition of scanning a document on the basis of a comparison result, wherein in a case in which no current is detected by the current-detecting unit, or in which the detected current value does not exceed the predetermined current threshold, or in which the detected current value does not exceed the predetermined current threshold and a predetermined number of LED blocks including a faulty LED are aligned, the determining unit determines the prohibition of scanning a document that, and wherein in a case in which the detected current value does not exceed the predetermined current threshold and the predetermined number of LED blocks including a faulty LED are not aligned, the determining unit determines the permission of scanning a document.