TONER CONCENTRATION METER
Original Publication Date: 1980-Jun-30
Included in the Prior Art Database: 2004-Apr-02
Xerox Disclosure Journal
In an electrophotographic printing machine, developer materials frequently employed in the magnetic brush development system are ferromagnetic. The effective permeability of the developer materials depend upon the toner particle concentration. As the effective permeability of the developer material decreases monotonically, the toner particle concentration increases. In order to utilize the foregoing properties, the developer material may flow through a tube 10 located in the air core of a transformer. The primary windings 12 of the transformer are excited with an alternating current input. The secondary windings 14 produce an alternating current output.