Patent ID: 6768562
Filing Date: 2004-07-27
Classification: G02B,H04N

Abstract:
A method for correcting a recording position of a light beam recorded on an exposure plane by a light beam scanning apparatus, in which at least one light beam of a plurality of light beams is deflected by an optical deflecting device and said plurality of light beams including the deflected light beam are combined and scanned by a common scanning optical system to said exposure plane, comprising steps of:(a) detecting respective positions of said plurality of light beams, before introducing said plurality of light beams into the scanning optical system, by using a beam position detecting device; (b) determining a first correction data for optical deflecting devices for keeping said detected relative beam positions of the respective light beams constant and storing said first correction data; (c) detecting the recording position of the light beam on said exposure plane to determine a deviation of the recording position from an optimum position, and obtaining a second correction data for correcting said deviation; and (d) adding said second correction data to said first correction data to obtain final correction data for driving said optical deflecting device; wherein at least said step (c) is conducted before a scanning operation.