Patent ID: 7940292
Filing Date: 2011-05-10
Classification: B41J,G02B

Abstract:
1. An optical scanning device comprising: a light source that includes a plurality of light emitting points arrayed in a two-dimensional manner; a coupling unit that couples light beams output from the light emitting points of the light source as coupled light beams, wherein the coupling unit comprises a lens with a spherical surface; a deflecting unit that deflects the coupled light beams output from the coupling unit as deflected light beams; a scanning optical system that guides the deflected light beams output from the deflecting unit to a scanning surface; an adjusting member that is arranged between the coupling unit and the deflecting unit and has a negative optical power at least in a sub-scanning direction, wherein the adjusting member has a lens with an aspherical surface; and a line-image forming member that is arranged between the adjusting member and the deflecting unit and has a positive optical power at least in the sub-scanning direction, wherein the adjusting member is mounted to be adjustable in an optical axis direction relative to the line-image forming member, the adjustable mounting of the adjusting member being fixable, whereby the position of the adjusting member in the optical axis direction relative to the line-image forming member may be fixed after the position of the adjusting member in the optical axis direction relative to the line-image forming member is adjusted to correct a beam pitch in the sub-scanning direction.