| 摘要 |
PURPOSE:To detect fine density variation accurately by detecting toner density by a means which senses and detects level variation of a two-component developer and a means which detects the mixing ratio of toner and carriers. CONSTITUTION:The 1st reactor 5 is the means which detects level variation of the two-component developer in a housing 2 sensitively. The reactor 5 is constituted by winding a coil 8 around a bobbin 7 almost in an O-shape and inserting fixedly center legs 6' of triangular yoke electrodes into the center hole so that the electrodes 6 face each other. The 2nd reactor 10 is the means which detects the density of the developer; and a coil 13 is wound around a bobbin 7 in an O- shape, a leg united with a nearly rectangular yoke electrode 11 is inserted and held in the center hole of the bobbin, and the electrode 1 is inserted into the developer 22 from outside of the housing arranged oppositely. |
