Patent ID: 7236184

Claim:
An exposure device for exposing a photosensitive medium to light on the basis of image data containing multiple pixels, comprising: a light source; a scanning mechanism for scanning on a photosensitive medium light emitted from the light source in a main scanning direction and transferring the photosensitive medium along a sub scanning direction substantially perpendicular to the main scanning direction; deriving unit deriving a pixel level between the pixel levels of two neighboring pixels contained in the image data; first control unit controlling the light source and the scanning mechanism so as to form an exposed region on the photosensitive medium by exposing the photosensitive medium to the light emitted from the light source according to the pixel level of each pixel contained in the image data; and second control unit controlling the light source and the scanning mechanism so as to expose the photosensitive medium to the light emitted from the light source according to the pixel level derived by the deriving unit in the region between the centers of two exposure regions corresponding to the two neighboring pixels being substantially in the sub scanning direction that are responsible for the derivation of the pixel level by the deriving unit.