Patent ID: 6683708
Filing Date: 2004-01-27
Classification: B41J,G02B,H04N

Abstract:
An optical exposure unit comprising:a light source which emits a light beam; first lens means given lens power associated with a first direction and a second direction, the second direction perpendicular to the first direction; second lens means given lens power associated with the first direction to converge the light beam output from said first lens means in the first direction; deflection means for deflecting the light beam output from said second lens means in the second direction perpendicular to the first direction, the deflection means including a reflection surface formed to be rotatable about a rotation axis extending in a direction parallel to the first direction as a center of rotation, and imaging means, including at least one lens, for imaging the light beam deflected at an equal speed by said deflection means at a predetermined position, wherein the at least one lens of the imaging means and the second lens means are of the same material, wherein a position of the beam is decentered from an optical axis of the at least one lens in the imaging means, wherein a position of the beam is decentered and tilted from the optical axis of the second lens means, a position of the beam is matched to an optical axis of the first lens means in the first and second direction, and an angle of the optical axis of the second lens means given positive power in the first direction has a predetermined tilt from an optical axis of the imaging means in the first direction, and a position of the optical axis of the second lens means is decentered from an optical axis of the imaging means in the first direction.