Patent ID: 6791729
Filing Date: 2004-09-14
Classification: G02B

Abstract:
A method of adjusting an imaging position of an optical beam spot in both a main scanning direction and a sub-scanning direction in an optical scanning device in which light flux from a light source side is formed into a long linear image in the main scanning direction using a linear image imaging optical system, the linear image being deflected by an optical deflector having a deflecting surface near where the linear image is formed, and in which the linear image is condensed toward a scanned surface using a scanning imaging optical system to form the optical beam spot on the scanned surface, the method comprising:providing, in the linear image imaging optical system, at least one lens having a power in the main scanning direction and at least one lens having the power in the sub-scanning direction; firstly adjusting the imaging position of the optical beam spot in the main scanning direction, by adjusting a position of the at least one lens having the power in the main scanning direction in an optical axis direction; and secondly adjusting the imaging position of the optical beam spot in the sub-scanning direction by collectively adjusting a position of the linear image imaging optical system as a whole, in the optical axis direction.