Developing device, image forming apparatus and toner concentration detecting method
AssigneeKYOCERA Document Solutions Inc.
InventorsKentaro Naruse, Rie Tezuka
Life of this patent
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Abstract
A developing device includes multiple developing units, and multiple toner concentration sensors. The multiple developing units contain respective developers. The multiple toner concentration sensors have respective LC oscillator circuits and are disposed at the respective multiple developing units. A capacitor constituting the LC oscillator circuit differs in capacitance at each of the toner concentration sensors installed on the multiple developing units.
Claims10
A developing device comprising:
- multiple developing units configured to contain developers;
- and
- multiple toner concentration sensors configured to have LC oscillator circuits and disposed at the respective multiple developing units,
- wherein a capacitor constituting the LC oscillator circuit differs in capacitance at each of the toner concentration sensors installed on the multiple developing units.
A developing device comprising:
- multiple developing units configured to contain developers;
- and
- multiple toner concentration sensors configured to have LC oscillator circuits and disposed at the respective multiple developing units,
- wherein a distance between a coil constituting the LC oscillator circuit and the developer to be detected differs at each of the toner concentration sensors installed on the multiple developing units.
A toner concentration detecting method of detecting toner concentrations of developers contained in multiple developing units using multiple signals having different oscillating frequencies output from multiple toner concentration sensors, wherein the multiple toner concentration sensors have LC oscillator circuits installed on the respective multiple developing units in which the developers intended for the toner concentration detection are contained, and differ in either capacitance of a capacitor constituting the LC oscillator circuit or inductance of a coil which is determined by a distance between the coil constituting the LC oscillator circuit and the developer.
Dependencies are inferred from the claim text.