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Image forming device

A technology of an imaging device and an image carrier, which is applied in the fields of electrography, optics, instruments, etc., can solve the problems of inability to obtain the original toner color, image defects, blurring, etc.

Inactive Publication Date: 2006-06-28
FUJIFILM BUSINESS INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, the residual toner that is not transferred at the transfer position in the lower stage or the lagged image of the transfer potential reaches the transfer position in the higher stage, causing damage to the transfer at the transfer position in the higher stage. hinder
Second, when the charge amount of the toner is high or when the transfer bias is high, there is a fear that the toner will scatter in various directions, causing image defects (toner scatter or fog) just before transfer
Third, the toner whose polarity is reversed in each transfer step may end up mixed into the developing unit so that the original toner color cannot be obtained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0023] figure 2 A full-color printer 100 is shown as an image forming apparatus according to one embodiment of the present invention. image 3 show in more detail figure 2 The imaging main part of the full color printer 100 is shown in . By the way, image 3 The arrows in indicate the direction of rotation of each rotating part. The basic structure of the imaging device and the operation of its imaging mode will be described below.

[0024] like figure 2 As shown, in general, a full-color printer 100 is composed of a printer body 101 and a paper feed tray portion 102 . The printer body 101 has an image forming unit 1, an exposure unit 12, and toner cartridges 14a to 14d for any one of yellow Y, magenta M, cyan C, and black K, respectively, extending from the toner cartridges 14a to 14d, respectively. Toner supply hoses 15a to 15d to unillustrated developing units corresponding to the respective colors, the control unit 6, the power supply unit 5 and the fixing unit 4....

example 1

[0062] exist Figure 4 , black circles indicate transfer residual toner, transfer potential hysteresis, and cleaning failure toner. It is known that such transfer residual toner and the like cause hindrance to secondary transfer. In the structure of the full-color printer 100 according to the present embodiment, the degree of occurrence of such interference tends to be much larger at the secondary transfer position T(2U) than at the secondary transfer position T(2L). On the other hand, it is generally necessary to make the image quality of the toner image K of black K higher than that of other color images because images are often formed in monochrome, ie, black and white.

[0063] Therefore, the toner image transferred onto the first primary intermediate transfer drum 21a is preferably not black K. In other words, the toner image transferred onto the second primary intermediate transfer drum is preferably black K. This corresponds to the combinations of cases 1-4, 7-10 and...

example 2

[0065] exist Figure 4 Among the toner images transferred to the first and second primary intermediate transfer drums 21a and 21b, the toner image a and the toner image c as surface layers may be toner at the time of secondary transfer. Toner is scattered or blurred. Therefore, it is preferable that the colors of the toner images a and c are as inconspicuous as possible, that is, the brightness is as high as possible. Also, toners having opposite polarities are produced in each transfer step. Due to the structure of the apparatus, the largest amount of this opposite-polarity toner adheres to the charging roller 11b, and the second largest amount of the opposite-polarity toner adheres to the charging roller 11d. Then, at the time of the cleaning mode described earlier, the opposite-polarity toner attached to the charging rollers 11b and 11d is discharged onto the photoreceptor drums 10b and 10d. However, toners of opposite polarities adhering to the charging rollers 11b and ...

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PUM

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Abstract

An image forming apparatus including a plurality of image carriers for carrying toner images of different colors respectively, a plurality of primary transferrers which abut against a part of the plurality of image carriers respectively so that the toner images on the image carriers are primarily transferred to the plurality of primary transferrers, a secondary transferrer which abuts against all of the plurality of primary transferrers so that toner images on the primary transferrers are secondarily transferred to the secondary transferrer, and a tertiary transferrer which abuts against the secondary transferrer so that a toner image on the secondary transferrer is tertiarily transferred to a recording medium. In the image forming apparatus, a black toner image is not transferred to at least a primary transferrer located most upstream in the rotating direction of the secondary transferrer with reference to the position where the tertiary transferrer abuts against the secondary transferrer.

Description

technical field [0001] The present invention relates to an image forming apparatus using an electrophotographic system, such as a copying machine, a printer, a facsimile machine, or a combination of these machines, and more particularly to an improvement in an image forming apparatus that superimposes toner images of a plurality of colors on each other to obtain a color image. Background technique [0002] A color image forming apparatus using an electrophotographic system (electrostatic transfer system), such as a copier or a printer, has been widely known. In such a color image forming apparatus, for example, three monochrome images of yellow, magenta, and cyan or four monochrome images of yellow, magenta, cyan, and black are formed on a photoreceptor, and are utilized in multiple stages. The type transfer unit repeats the electrostatic transfer. Consequently, color toner images in which monochromatic toner images are superimposed on each other are finally obtained on a r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/01G03G15/14G03G15/16
CPCG03G15/0178G03G15/0194
Inventor 浅野和夫伊藤功增渕富志雄
Owner FUJIFILM BUSINESS INNOVATION CORP
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