Printer having circuit for providing improved printing quality

A non-impact printer comprising:

• signal generator means for receiving a video signal, including first and second bit data, and generating a first printing data signal corresponding to the first bit data of the video signal received to form a print line of printing dots;
• drive energy setting means for setting a drive energy corresponding to the first printing data signal generated;
• and
• a printer head operative in response to the drive energy set for generating dots of light in a print line at a first resolution to form on a photoconductive body an electrostatic latent image of the video signal, the photoconductive body having a sensitivity threshold, above which with a dot of light having the drive energy a printing dot is formed on the photoconductive body;
• said signal generator means being operative in response to the second bit data of the video signal, which are of a second resolution of printing dots higher than the first resolution, to convert the second bit data, which does not correspond to the printing dots of the print line at the first resolution, into a second printing data signal forming printing dots adjacent to each other in the print line at the first resolution;
• said drive energy setting means being operative in response to the second printing data signal to set the drive energy of a dot of light at such a level that the sensitivity threshold is reached not by the drive energy of a dot of light in the print line at the first resolution but is reached by the drive energy synthesized by the dots of light which are adjacent to each other and correspond to the second printing data signal in the print line.