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Developer for detecting developed gap

A developing device and gap technology, applied to the electric recording process using the charge pattern, the equipment of the electric recording process using the charge pattern, and the electric recording technique, which can solve the problems of reducing accuracy and high production cost

Inactive Publication Date: 2004-02-25
SAMSUNG ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the cost of the optical sensor, the production cost is too high
[0016] US Patent No. 5521683 discloses a technique for detecting the development gap by providing constant voltage and constant current. Due to the change of the development gap, the voltage and current often change, which reduces the accuracy of this technique.

Method used

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  • Developer for detecting developed gap
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Embodiment Construction

[0032] Referring to the detailed description of the preferred embodiment of the invention, specific examples of the embodiment are shown in the accompanying drawings, like reference numerals referring to like parts throughout.

[0033] Figure 4 A graph showing the relationship between image quality and developing gap in the present invention. like Figure 4 As shown, as the development gap increases, the image density decreases, resulting in poor image quality. Therefore, in order to obtain the same image quality, it is necessary to supply a voltage according to a developing electric field condition suitable for each developing gap. It is also possible to suppress changes in image density and line depth and prevent image noise by adjusting imaging conditions according to differences and changes in the developing gap.

[0034] Figure 5 A graph showing the relationship between discharge initiation voltage and developing gap in the present invention. In order to explain th...

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Abstract

A development device includes a developing gap detection function. The development device also includes an organic photoconductive body, a developer conveying body, a DC power supply, an AC power supply, a discharge start voltage detection portion, and a controller. The discharge start voltage detection portion detects a discharge start voltage occurring between the developer conveying body and the organic photoconductive body when a voltage is supplied from the power supply unit in increments at predetermined intervals. The controller obtains a developing gap between the organic photoconductive body and the developer conveying body based on the discharge start voltage detected by the discharge start voltage detection portion, and outputs a developing voltage suitable for the obtained developing gap. Accordingly, the development device having the developing gap detection function detects the developing gap easily and accurately by recognizing the discharge start voltage, and improves image quality by regulating an image forming condition.

Description

technical field [0001] The present invention relates to a developing device, which is used in image forming equipment of office equipment such as laser printers, facsimile machines, digital copiers, etc. using electrostatic copying technology, and its function is to develop an electrostatic latent image on an organic photoconductive drum Become a toner image. More particularly, the present invention relates to a developing device capable of accurately and economically detecting a distance between a developer conveying body such as a developing roller and a photoconductive drum. Background technique [0002] figure 1 is a schematic diagram of a common developing device. [0003] like figure 1 The illustrated developing device 1 includes an organic photoconductive drum 4 on which an electrostatic latent image is formed by an LSU (laser scanner) (not shown in the figure) using the potential of its surface; a charging roller 2, The charging roller 2 rotates while being kept ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/06
CPCG03G15/065G03G15/06
Inventor 李铉哲
Owner SAMSUNG ELECTRONICS CO LTD