Patent ID: 7777913
Filing Date: 2010-08-17
Classification: H04N

Abstract:
1. An image reading apparatus comprising: a plurality of light emitting units each emitting a light to irradiate a reading target with the light; an activation unit that sequentially activates the plurality of light emitting units, respectively, in accordance with a predetermined order; a plurality of light receiving units each outputting an output signal when receiving a reflected light from the reading target; and a determination unit that retrieves at least one output signal from the plurality of light receiving units in accordance with a predetermined retrieving procedure each time each of the plurality of light emitting units is activated sequentially, the predetermined retrieving procedure being configured such that at least one output signal is retrieved from a part of the plurality of light receiving units in response to an activation of each of the plurality of light emitting units, and determines, based on the at least one output signal, whether or not at least one of at least one of the plurality of light emitting units and at least one of the plurality of light receiving units is normal.