| 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.
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