Patent ID: 8531737

Claim:
A scanning device, comprising: a first scanning unit having a first light source that emits a first light beam and is arranged only at one side of the first scanning unit in a main scanning direction, the first scanning unit being arranged to scan a first surface of a scan-target medium along the main scanning direction to obtain a first image; and a second scanning unit having a second light source that emits a second light beam and is arranged only at one side of the second scanning unit in the main scanning direction, the second scanning unit being arranged to scan a second surface of the scan-target medium along the main scanning direction to obtain a second image, wherein the first scanning unit and the second scanning unit are disposed such that the first light source and the second light source are arranged at the same side in the main scanning direction, and an extended line of the first light beam does not intersect with the second light beam between the second light source and the scan-target medium, and an extended line of the second light beam does not intersect with the first light beam between the first light source and the scan-target medium, and the first scanning unit and the second scanning unit are configured to concurrently scan the first surface and the second surface, respectively, in the same direction along the main scanning direction.