Patent ID: 7525561
Filing Date: 2009-04-28
Classification: G02B,G03G,G06K,H04N

Abstract:
1. An optical scanner for scanning a plurality of image carriers comprising: an illuminant part emitting a plurality of optical beams; a deflecting part deflecting the optical beams; an image forming part focusing the deflected optical beams on respective image carriers of the plurality of image carriers; and an optical axis adjustment part positioned between the deflecting part and the illuminant part, and vibrating a scanning position with respect to a sub-scanning direction periodically during writing of an image, the optical axis adjustment part including an amplitude or phase adjustment part adjusting a phase or amplitude of the scanning position being vibrated by the optical axis adjustment part relative to an original scanning position including variations due to speed variations of rotation of an image carrier, and the optical axis adjusting part adjusting beam spot positions of the optical beams on the plurality of image carriers with respect to a sub-scanning direction by vibrating the beam spot positions of the optical beams on the plurality of image carriers with respect to the sub-scanning direction slowly relative to a period of optical scanning.