Abstract
A charge to mass ratio (q/m) measurement is one of the most critical measurements for electrophotography developers. A compact draw-off system provides substantial versatilities for q/m measurement of both dual and single component developers. There are two different Faraday cups equipped on the system so that it can measure each charge amount of both toner and carrier simultaneously for dual component developer. Nozzle unit, which consists of a dedicated Faraday cup itself, is designed to ensure an excellent maneuverability for separating toner and carrier through mesh on sample cell case for dual component toner. Direct toner sampling can be accomplished from toner charging roller and/or photoreceptor for single component toner. Additionally a toner concentration ratio between toner and carrier can be obtained. Extremely accurate q/m measurement is easily available at both R & D and manufacturing sites with this simple and user-friendly measurement system.
