Patent ID: 8199182
Filing Date: 2012-06-12
Classification: B41J,G02B,G03G

Abstract:
1. An exposing device which radiates light on a photoconductor drum which rotates, thereby executing exposure, the exposing device comprising: a light-emitting element unit including a plurality of light-emitting elements, each having an emission area which emits generated light, the emission area having a rectangular shape with a long side along a direction perpendicular to a rotational direction of the photoconductor drum, and a short side along the rotational direction, the short side being shorter than the long side; a lens unit which focuses the light, which is emitted from the emission areas of the light-emitting elements, on a peripheral surface of the photoconductor drum, thereby executing exposure and forming on the peripheral surface beam spots, each of the beam spots having a shape corresponding to the shape of its respective emission area; and a driving circuit which drives the light-emitting element unit at a predetermined cycle time and causes each of the light-emitting elements to emit light a plurality of times, at a predetermined time interval, within the cycle time, thereby forming the beam spots on the peripheral surface of the photoconductor drum each time the light-emitting element is caused to emit light, the beam spots being formed at positions where the beam spots partially overlap one another along the rotational direction, wherein a width of the beam spots formed on the peripheral surface within the cycle time, in the rotational direction, is made to be close to a width of the beam spots in the direction perpendicular to the rotational direction.