Patent ID: 8446648

Claim:
An image reading apparatus, comprising: a light source configured with a plurality of light-emitting elements disposed in a row in a main scanning direction that irradiate light toward an original; and a photoelectric conversion element that receives light reflected from the original, wherein an output light amount from the light-emitting elements can be adjusted, and a state of bright spots due to repetition of light-dark in the main scanning direction on a light irradiation face of the original due to the plurality of light-emitting elements is determined, and the output light amount from the light-emitting elements is adjusted based on the determination result of the state of the bright spots, wherein light is irradiated from the light-emitting elements to a reference image for detecting the state of the bright spots on the light irradiation face of the original and reflected light reflected from the reference image is read by the photoelectric conversion element, a calculated value for determining the state of the bright spots is calculated from the read value read by the photoelectric conversion element, and the calculated value is compared to a set value that has been set in advance to determine the state of the bright spots on the light irradiation face of the original.