| 摘要 |
A device for detecting the density of a two-component developer consisting essentially of a toner and a carrier for an electrophotographic copying machine and the like comprises a cylindrical magnet and a sleeve which covers it. They rotate inside a developing tank so that the developer will flow in a layer on the sleeve surface. A baffle plate is provided to control this flow and to form a small pool of the developer where its density can be effectively measured by a sensor. The bottom end of the baffle plate near the sleeve surface is immersed in the developer inside the tank so that the motion of the developer into and out of the pool formed in the vicinity of the sensor is smooth and stable.
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