Patent ID: 7277111
Filing Date: 2007-10-02
Classification: B41J,G03G

Abstract:
1. An electrophotographic device comprising: at least two laser sources, each laser source independently controllable to emit a laser beam; a photoconductive surface operable at two or more image transfer rates; a scanning device having a plurality of deflecting surfaces, said scanning device arranged to direct said laser beams so as to sweep in a scan direction across said photoconductive surface such that, for each sweep, scan lines written by said laser beams are spaced from one another on said photoconductive surface in a process direction that is nominally orthogonal to said scan direction by a predetermined beam scan spacing; and a controller arranged to maintain a desired image characteristic independent of a selected one of said image transfer rates by controlling said laser beams so as to write image data only at select scan lines that have been identified from candidate scan lines wherein: