Patent ID: 8305407

Claim:
An exposure device comprising: a plurality of exposure heads having a plurality of light-emitting elements arranged in a first direction, the plurality of exposure heads also being arranged in the first direction; a plurality of temperature detecting units for detecting temperature arranged at both ends in the first direction of each of the plurality of exposure heads; and a correction unit for correcting quantities of light emitted from the exposure heads based on temperature data detected by the temperature detecting units, wherein, of both end portions in the first direction of a first exposure head of the plurality of exposure heads, at least a first end on a side where a second exposure head is arranged is used as a reference, and the correction unit corrects a quantity of light at the first end so as to return the quantity of light to an initial quantity of light, and corrects a quantity of light of the second exposure head arranged on the side of the first end so as to reduce a variation in the quantity of light of a seam portion formed by the first exposure head and the second exposure head.