| 摘要 |
Apparatus for controlling developer efficiency in an electrostatic copying machine. A thin film of semi-insulating material is positioned for advancement through a development zone indicative of the quality of a developer system. Positioned in the path of the film and in the vicinity of the development zone are a plurality of conductive members which are coupled to sources of potential having a difference in voltage of approximately 200 to 600 volts in one embodiment. The difference in potential cause the development along the semi-insulating film material where the electrostatic fields are greatest. The film is then advanced past a detection station which includes an optical sensing device for sensing the transmission of the film and supplying signals indicative of the transmission characteristics to a control circuit which controls the toner dispensing in the developer system. In an alternative embodiment three conductive members may be used in place of the two conductive members with the middle conductive member being at one electric potential and the outer conductive member being at a second potential.
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