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Developing device, image forming apparatus and toner concentration detecting method

A technology of toner concentration and developing device, which is applied in the direction of electric recording process applying charge pattern, equipment of electric recording process applying charge pattern, electric recording technique, etc. The effect of ensuring accuracy and suppressing radiation noise

Inactive Publication Date: 2015-03-25
KYOCERA DOCUMENT SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in the above-mentioned technique B, since the ground plate is provided on the reverse side of the substrate, the coil cannot be provided, so there is a problem that the accuracy of toner concentration detection is lowered.

Method used

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  • Developing device, image forming apparatus and toner concentration detecting method
  • Developing device, image forming apparatus and toner concentration detecting method
  • Developing device, image forming apparatus and toner concentration detecting method

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Embodiment Construction

[0025] Hereinafter, a developing device and an image forming apparatus including the developing device according to an embodiment of the present invention will be described with reference to the drawings.

[0026]

[0027] figure 1 It is a front cross-sectional view showing the structure of an image forming apparatus including the developing device according to the first embodiment of the present invention.

[0028] The image forming apparatus 1 according to the first embodiment of the present invention is, for example, a multifunction peripheral having multiple functions of a copy function, a printer function, a scan function, and a facsimile function. The image forming apparatus 1 is configured to include an operation unit 47 , an image forming unit 12 , a fixing unit 13 , a paper feeding unit 14 , a document supply unit 6 , a document reading unit 5 , and the like in an apparatus main body 11 .

[0029] When image forming apparatus 1 performs a document reading operation...

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PUM

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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. The electrostatic capacity of capacitors which are arranged on the toner concentration sensors of the developing units forming the LC oscillator circuits is different. Thus, detection precision of toner concentration can be ensured and devices can be restrained from generating irradiation noise.

Description

technical field [0001] The present invention relates to a developing device, an image forming device, and a toner concentration detection method, and more specifically, to a technique for detecting the toner concentration of a developer contained in a developing device. Background technique [0002] A toner concentration sensor having an LC oscillation circuit is known as a device for detecting the toner concentration of a developer contained in a developing device. The toner concentration sensor detects the toner concentration of the developer by grasping a change in magnetic permeability due to a change in the toner concentration of the developer as a change in the oscillation frequency of the LC oscillation circuit. In recent years, for the purpose of miniaturization and cost reduction, a toner concentration sensor using a planar coil as a coil constituting an LC oscillation circuit has appeared. [0003] Here, in an image forming apparatus that performs color printing, ...

Claims

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Application Information

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IPC IPC(8): G03G15/08G03G15/00
CPCG03G15/0851G03G15/0853G03G15/0865
Inventor 成世健太郎手塚理恵
Owner KYOCERA DOCUMENT SOLUTIONS INC
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