Patent ID: 7573015

Claim:
An image reading device which reads a document as an image, comprising: a light source unit; a light receiving unit which receives light outputted from the light source unit and arriving by way of the document and accumulates charges according an amount of received light; a transporting mechanism which relatively transports either one of the light receiving unit or the document in a predetermined scanning direction with respect to the other; a light reception control unit which repeatedly performs accumulating charges to the light receiving unit in a predetermined charging period and reading an amount of charges accumulated in the light receiving unit during the transportation; and an irradiation control unit which irradiates the light receiving unit with the light from the document during a first light receiving period starting from a beginning point of the charging period and a second light receiving period ending at an ending point of the charging period and which does not irradiate the light receiving unit with the light from the document between the first light receiving period and the second light receiving period.