Patent ID: 8760732

Claim:
An image reader comprising: A first reading device comprising: a first light emitting unit configured to emit light toward a first side of a document sheet that is in a predetermined reading area; a first light receiving unit configured to receive light emitted by the first light emitting unit and then reflected by the document sheet and light emitted by the second light emitting unit and then transmitted through the document sheet; A second reading device comprising: a second light emitting unit configured to emit light toward a second side of the document sheet that is in the predetermined reading area; a second light receiving unit configured to receive light emitted by the second light emitting unit and then reflected by the document sheet and light emitted by the first light emitting unit and then transmitted through the document sheet; a controller configured to: control the first light emitting unit to emit light of a first color toward the document sheet; control the second light emitting unit to emit, toward the document sheet, light of a second color different from the first color, the first color and the second color being mutually complementary colors; and control the first light receiving unit to output read image data of the document sheet based on a light receiving result of the first light receiving unit, wherein the controller is configured to perform a double-side reading process to: control the first light emitting unit to emit light of the first color toward the document sheet; control the second light emitting unit to emit, toward the document sheet, light of the second color different from the first color, the first color and the second color being mutually complementary colors; control the first light receiving unit to output read image data of the first side of the document sheet based on the light receiving result of the first light receiving unit; and control the second light receiving unit to output read image data of the second side of the document sheet based on a light receiving result of the second light receiving unit.