Patent ID: 8824026

Claim:
An image reading apparatus comprising: an original placement surface configured to support an original to be read by an image reading unit; the image reading unit comprising: a light emitting unit which is arranged along a main scanning direction, the main scanning direction being orthogonal to a sub-scanning direction, the light emitting unit having a first length in the main scanning direction and being configured to irradiate the original placed on the original placement surface with light; a light detector arranged along the main scanning direction, the light detector having a second length in the main scanning direction, the second length being longer than the first length, the light detector comprising: a reflected light detector which comprises a first plurality of light receiving elements configured to detect light, and is disposed inside the first length of the light emitting unit; and an outside light detector which comprises a second plurality of light receiving elements configured to detect light and is disposed outside the first length of the light emitting unit, and a reflected light correcting unit which corrects detection result data regarding the light detected by the reflected light detector based on detection result data detected by the outside light detector.