Patent ID: 7580648
Filing Date: 2009-08-25
Classification: G03G

Abstract:
1. A method for modulating the potential applied across a development nip in a development system having a conductive donor roll and a conductive photoreceptor, the method comprising: applying a first potential to the donor roll for a first pulse time, wherein the first potential dislodges toner from the surface of a donor roll and projects the toner into a development nip toward a photoreceptor, and applying a second potential to the donor roll for a second pulse time, wherein the second potential lowers the momentum of the toner; applying a third potential to the donor roll for a third pulse time, wherein the third potential holds the toner in the development nip to allow development of the photoreceptor, wherein the magnitude of the third potential is smaller than the first potential; and applying a fourth potential to the donor roll for a fourth pulse time, wherein the fourth potential urges undeveloped toner in the development nip toward the surface of the donor roll.