公开(公告)号：US3756192A

公开(公告)日：1973-09-04

申请号：US3756192D

申请日：1971-12-17

Applicant: IBM

Inventor： LOCKLAR H ,  TAO D ,  TARVER L

IPC: G03G15/08 ,  B05C11/00

CPC classification number: G03G15/0855 ,  G03G15/0891 ,  Y10S222/01

Abstract: A toner concentration control system for an electrostatic copier wherein light is alternately reflected from multicomponent developer material containing toner and from a calibrated reflector to a photosensor. An imbalance of toner in the developer material results in a difference in reflected light intensity from the developer and reflector which is converted into an electrical signal having an AC component. A phase sensing circuit detects the position of the peak of the AC signal component with reference to the position of the calibrated reflector and provides a control signal to a toner replenishing device. Developer flow past the photosensor is intermittently halted during concentration sensing to reduce noise effects. A plurality of selectable calibrated reflectors provide different concentration settings. Additional concentration settings are obtained by varying the light spectrum emitted by the light source.

Abstract translation: 一种用于静电复印机的调色剂浓度控制系统，其中光从含有调色剂的多组分显影剂材料和从校准的反射器交替反射到光电传感器。 显影剂材料中的调色剂的不平衡导致来自显影剂和反射体的反射光强度的差异被转换为具有AC分量的电信号。 相位检测电路参考校准反射器的位置检测交流信号分量的峰值的位置，并向调色剂补充装置提供控制信号。 在浓度检测过程中，经过光电传感器的显影剂流被间歇地停止，以减少噪音的影响。 多个可选校准的反射器提供不同的浓度设置。 通过改变由光源发射的光谱获得附加的浓度设置。