Patent ID: 7518763

Claim:
An image reading apparatus comprising: a first reading unit that captures an image on a first side of a document, the first reading unit including a first light source for emitting light to the first side of the document from one side of a transfer path on which the document is conveyed and a first sensor for receiving light reflected from the first side of the document; a second reading unit that captures an image on a second side of the document, the second reading unit including a second light source, which has emission characteristics different from those of the first light source, for emitting light to the second side of the document from the other side of the transfer path and a second sensor for receiving light reflected from the second side of the document; and a filter that is provided between the second light source and the transfer path and brings the emission characteristics of the light emitted from the second light source onto the document closer to those of the light emitted from the first light source onto the document.