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Image forming apparatus with developing units having different voltage levels

一种显影单元、电压的技术，应用在应用电荷图形的电记录工艺的设备、应用电荷图形的电记录工艺、电记录术等方向，能够解决难以获得彩色图像、无法调节偏差、难显影电压等问题

Active Publication Date: 2011-05-11
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So there is no way to adjust the deviation of the component related to the zener voltage of the zener diode
[0009] For example, if the source voltage supplied to each developing device is adjusted to supply a voltage to a yellow (Y) developing device (taking into account the deviation of the component of the Zener diode corresponding to the yellow (Y) developing device), then when applied to A shift of several tens of volts occurs in the voltage of other developing devices, making it difficult for each developing device to control the developing voltage at the desired voltage level
In other words, it is difficult for each developing device to obtain its desired color image due to the deviation of the Zener diode assembly that forms a potential difference between the developing bias voltage and the supply bias voltage, resulting in deterioration of color image quality

Method used

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  • Image forming apparatus with developing units having different voltage levels
  • Image forming apparatus with developing units having different voltage levels
  • Image forming apparatus with developing units having different voltage levels

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Embodiment Construction

[0032] Reference will now be made in detail to at least one embodiment, examples of which are illustrated in the accompanying drawings, in which similar reference numbers refer to similar elements throughout.

[0033] figure 1 It is a structural diagram illustrating an image forming apparatus according to at least one exemplary embodiment.

[0034] reference figure 1 , The image forming apparatus 1 according to at least one exemplary embodiment includes a main body 10, a printing medium feeder 20, a light scanning unit 30, a photoconductor drum 40, a developing device 50, a transfer unit 60, a fixing unit 70, and a printing medium Releaser 80.

[0035] The main body 10 forms the appearance of the image forming apparatus 1 and supports various components installed in the image forming apparatus. The body cover 11 is rotatably installed at one end of the body 10. The cover 11 opens or closes certain parts of the body 10.

[0036] The printing medium feeder 20 feeds the printing medium...

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Abstract

An image forming apparatus is disclosed. Zener diode separately installed to correspond to each developing device so as to form a difference in potential between the developing bias voltage and the supply bias voltage of each developing device, is installed at a common end, so that a deviation of the developing voltage applied to the developing device affected by a deviation of Zener diode components can be reduced, resulting in an increased color image quality. In addition, the Zener diode is installed in a common end, such that the number of Zener diodes is reduced, resulting in a reduction in production costs.

Description

Technical field [0001] At least one embodiment relates to an image forming apparatus including a plurality of developing devices using an electrophotographic scheme. Background technique [0002] Generally, an electrophotographic printer forms an electrostatic latent image by scanning light onto a photoconductor drum charged with a predetermined electric potential, develops the electrostatic latent image with toner of a predetermined color, and transfers and fixes the developed image to paper, thereby Form a color image. [0003] In order to print a full-color image, the image forming apparatus requires the colors yellow (Y), magenta (M), cyan (C), and black (K). Therefore, four developing devices are required to fix the four colors of toner on the electrostatic latent image. [0004] A high voltage (for example, several hundred volts or several thousand volts) is applied to each developing device, such as a developing bias voltage applied to the developing roller to fix the toner ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/06G03G15/01
CPCG03G15/065G03G15/01G03G15/0121G03G15/80
Inventor 严允燮
Owner HEWLETT PACKARD DEV CO LP