INRICHTING VOOR HET WAARNEMEN VAN HET ONTWIKKELVERMOGEN VAN XEROGRAFISCH ONTWIKKELMATERIAAL.

摘要

A developability control system for an electrostatic recording apparatus in which a sensor including two parallel spaced NESA glass plates through which developer material flows are connected in a circuit wherein each is electrically charged alternately for equal periods of time. While each plate is charged, it is adapted to attract toner. A light source on one side of the two plates and a photocell on the other side "senses" the sum toner deposit on the two plates at all times thereby effecting a steady state control signal.