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Reflectivity Reference Standard For Toner Concentration Sensor Disclosure Number: IPCOM000067656D
Original Publication Date: 1979-Sep-01
Included in the Prior Art Database: 2005-Feb-20

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Baca, JP Bilby, KL Pauler, AF [+details]


U.S. Patent 3,756,192 describes a reflective chopper-wheel target (reference number 65 of that patent) which is used in a xerographic copier to calibrate a phototransistor/light-emitting diode (LED) system which senses the toner concentration in a developer mix consisting of toner and carrier.