Patent ID: 6055084
Filing Date: 2000-04-25
Classification: B41J,G02B,H04N

Abstract:
An optical exposure unit comprising:M sets of light sources for emitting N.sub.i light beams, wherein M is an integer not less than 1, i=1 to M, and at least one set of the light sources that satisfies i.gtoreq.2;first lens means for converting the light beams emitted by each of the light sources into one of convergent light and collimated light, said first lens means including one of a finite lens and collimate lens in number corresponding to a sum of N.sub.1 to N.sub.M ;second lens means given lens power associated with a first direction to converge the light beams output from each of said first lens means in only the first direction, M sets of said second lens means being provided;M-1 synthesizing reflection mirrors that reflect M-1 groups of beams from M-1 sets of said second lens means to be substantially overlaid as M groups of beams from M sets of said second lens means in the first direction;deflection means for deflecting the light beams output from said second lens means and said reflection mirrors in a 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; andimaging means, including at least one lens, for imaging each of the light beams deflected at an equal speed by said deflection means at a predetermined position,wherein an effective field angle .phi. of a beam deflected by said deflection means satisfies:1.2 (W/L.sub.t)>.phi.>W/L.sub.twhere L.sub.t is a distance between a reflection point on said deflection means and an image surface, andW is an effective image region width including a region where a horizontal synchronization signal is detected.