Patent ID: 7697857
Filing Date: 2010-04-13
Classification: G03G

Abstract:
1. A multi-sensor calibration method for obtaining improved accuracy of transfer efficiency measurements in a reprographic device, comprising: providing a charge retentive surface; providing a patch on said charge retentive surface; placing toner mass onto said patch; developing said toner mass; providing a transfer subsystem for transferring toner from said charge retentive surface to a media surface; providing a sensor to sensor calibration update routine that includes an algorithm that reduces sensor to sensor response differences among a first sensor for sensing said toner mass on said patch before reaching a transfer station of said transfer subsystem and a second sensor for sensing said toner mass on said patch, after passing said transfer station, and wherein said calibration algorithm identifies a ratio of sensitivities of each sensor by utilizing the passing of said developed toner mass under each sensor and recording the response while simultaneously disabling said transfer subsystem during said sensor to sensor calibration update routine; and using output signals from said first and second sensors, in addition to said ratio of sensitivities of each sensor and each sensor's response to a zero mass condition (clean belt) to compute a ratio transfer efficiency measurement.