Patent ID: 7479977
Filing Date: 2009-01-20
Classification: G02B,H04N

Abstract:
1. An image forming apparatus, comprising: a laser scanning unit having at least two laser sources to emit laser beams to form an electrostatic latent image on a photosensitive body; an engine driving unit having at least one driving motor to drive a plurality of built-in units so as to form an image on a printable medium with a certain process speed; and a control unit arranged to control one of the laser scanning unit and the engine driving unit to change one of a process speed of the engine driving unit and a scan speed of the laser scanning unit with a certain rate depending on a resolution selected when the laser scanning unit forms the electrostatic latent image on the photosensitive body, wherein the resolution selected is a resolution corresponding to a magnification (K) of a preset value or for a basic resolution calculated with the following expression: wherein the control unit controls the laser scanning unit such that laser beams containing image information are to be emitted from the laser diodes advancing by a correction distance (D) in an initial scan of an image, and laser beams containing image information are to be emitted from the laser diodes lagging by the correction distance (D) in a last scan of the image calculated with the following expression: wherein d is an interval between scan lines and K is the magnification for the basic resolution corresponding to the selected resolution.