Patent ID: 8411125

Claim:
An exposure device comprising: an exposure unit including a plurality of light sources linearly arranged; and a driving unit that is configured to drive each of the light sources to make the exposure unit expose an exposure object, wherein the exposure device forms a plurality of pixels with spots on the exposure object at a position corresponding to the light sources, each of the pixels is formed with a group of a plurality of spots or a single spot, a barycentric position of each of the pixels is determined by distribution of the spots or a position of the single spot, and while the driving unit maintains number of pixels on the exposure object in a first direction corresponding to an array direction of the light sources, an exposure feasible width within which the exposure unit performs exposure on the exposure object is adjustable in the first direction by the driving unit setting the barycentric position at least in the first direction out of the first direction and a second direction that is a moving direction of the exposure object.