Patent ID: 6219167
Filing Date: 2001-04-17
Classification: B41J,G02B,H04N

Abstract:
An optical exposure unit comprising:light sources which are arranged in correspondence with numbers indicated by N.sub.1 to N.sub.M M.gtoreq.2 and emit light beams;first lens means for converting the light beams emitted by each of said light sources into one of convergent light and collimated light;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 the first direction, M sets of said second lens means being provided;deflection means for deflecting the light beams output from said second lens means in a second direction perpendicular to the first direction, said deflection means including a reflection surface which is 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 lenses, for imaging each of the light beams deflected at an equal speed by said deflection means at a predetermined position, andwherein an effective field angle .0. of a beam deflected by said deflection means satisfies:1.2(W/L.sub.t)>.0.>W/L.sub.twhere L.sub.t is the distance between a reflection point on said deflection means and an image surface, andW is the effective image region width including a region where a horizontal synchronization signal is detected.