An image forming apparatus is provided which is immune to characteristic variations of a photoconductor and a developer material, which can detect the amount of toner adhering to a test toner image accurately, and which can always form a favorable image using an optimal image forming parameter....http://www.google.es/patents/US5822079?utm_source=gb-gplus-sharePatente US5822079 - Digital image forming apparatus with test image optimization
Digital image forming apparatus with test image optimization
