Monitoring Toner Throughput in an Electrophotographic Machine
Original Publication Date: 1985-Mar-01
Included in the Prior Art Database: 2005-Feb-18
This article describes a technique for monitoring toner throughput in an electrophotographic machine by using a patch toner sensor for measuring the amount of background toner. Toner throughput is a measure of the efficiency of the electrophotographic process. It is also an indirect measure of potential problems resulting from excessive contamination in the machine. Therefore, maintaining a minimum amount of toner throughput will increase the reliability of the machine. The primary contributor to toner throughput is the amount of background toner. The difference of the reflectance of background toner, Rb, subtracted from the reflectance of a clean photoconductor, Rp, provides a value that is proportional to the toner throughput.