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Image forming apparatus

An imaging device and image technology, which can be applied to the equipment, instruments, optics and other directions of the electric recording process applying the charge pattern, and can solve the problems such as the increase of the amount of the secondary transfer toner.

Inactive Publication Date: 2007-03-21
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the amount of residual secondary transfer toner may increase

Method used

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Experimental program
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no. 1 approach

[0026] An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Overall configuration of the imaging device

[0028] The image forming apparatus according to the present invention as shown in FIG. 1 is a full-color image forming apparatus that primarily transfers a toner image formed on a photoconductor drum (image carrier) 1 to an intermediate transfer belt (intermediate transfer body) 5, and then secondarily transfer the toner image onto a recording medium.

[0029] The image forming apparatus according to this embodiment includes one photoconductor drum 1 and six developing devices (developers or toner image forming devices) 4 that develop electrostatic images formed on the photoconductor drum 1 . The six developing devices 4 are filled with toners of light cyan, light magenta, dark magenta, dark cyan, yellow and black, respectively.

[0030] Thus, the toner images of light cyan, light magenta, dark mag...

no. 2 approach

[0132] Fig. 9 is a second embodiment of the present invention. The image forming apparatus according to the present invention employs a tandem system in which image forming units Pa to Pf respectively provided with photoconductor drums 1 are arranged along an intermediate transfer belt 5 rotating in the direction of arrow R2.

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PUM

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Abstract

The present invention relates to an imaging device. The image forming apparatus includes: a first image carrier for carrying a light-colored toner image formed with light-colored toner; a first transfer member for electrostatically transferring the light-colored toner image onto an intermediate transfer body a second image carrier for carrying a dark toner image formed with a dark toner having the same hue as the light toner but having a higher density than the light toner; a second transfer member for electrostatically transferring the dark toner image onto an intermediate transfer body; and electrostatically transferring the dark toner image and the light toner image together to a recording A secondary transfer body on a medium in which the light-colored toner has a larger volume-average particle diameter than the dark-colored toner.

Description

technical field [0001] The present invention relates to an image forming apparatus that primarily transfers a toner image from an image carrier to an intermediate transfer body, and then uses toners having the same color tone but different color densities, such as dark magenta toner and light Magenta toner or the like, which secondarily transfers the toner image onto a recording medium. Background technique [0002] In recent years, electrophotographic type image forming apparatuses have been using toners having the same color tone but different color densities, such as dark magenta toner and light magenta toner, etc., to expand the range of color reproduction. [0003] In this type of image forming apparatus, a dark magenta toner image forming unit and a light magenta toner image forming unit are provided so that a dark magenta toner image and a light magenta toner image are formed. [0004] In the image forming unit, the toner image formed on the photoconductor drum is se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/16G03G15/00
CPCG03G15/1605G03G2215/0602
Inventor 村山龙臣丰原裕一郎
Owner CANON KK
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