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Image forming apparatus

An image and image bearing body technology, applied to the electric recording process using the charge pattern, the equipment for the electric recording process using the charge pattern, and the electric recording technique, which can solve the problems such as the reduction of developability

Inactive Publication Date: 2010-12-15
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the charge amount Q / M (μC / g) of the toner is increased, the developability may be significantly reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] (image forming device)

[0076] figure 1 A schematic cross-sectional structure of main parts of an image forming apparatus 100 according to an embodiment of the present invention is shown.

[0077] The image forming apparatus 100 has a cylindrical electrophotographic photoreceptor, a so-called photoreceptor drum (hereinafter simply referred to as a “photoreceptor”) 1 as an image carrier. Around the photoreceptor 1, a charger 2 as a charging unit, an exposure device 3 as an exposure unit, a developer 4 as a developing unit, a transfer charger 5 as a transfer unit, and a washer as a cleaning unit are disposed. 7. And the front exposure unit 8 as the front exposure unit. In addition, downstream of the transfer section N where the photoreceptor 1 and the transfer charger 5 face each other in the conveying direction of the transfer material P, a fuser 6 as a fixing unit is arranged.

[0078] As the photoreceptor 1 , a general OPC photoreceptor which is a photoreceptor havi...

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PUM

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Abstract

An image forming apparatus includes a photosensitive drum to which an electrostatic image is formed and a developing sleeve carrying a developer including toner carrier. An alternating voltage is applied to the sleeve to form an alternating electric field between the sleeve and the drum to develop the electrostatic image with the developer. A relation |K 1 |<|K 2 | is satisfied, where K 1 : a slope at an electric field intensity Ed=|(Vp 2 -VL) / D|, K 2 : a slope at an electric field intensity Eb=|(Vp 1 -VL) / D|, VL: a potential [V] of the electrostatic image at which a maximum density is obtained, Vp 1 : a peak potential [V] that provides a potential difference to move the toner toward the drum, Vp 2 : a peak potential [V] that provides a potential difference to move the toner toward thesleeve, and D: a closest distance [m] between the drum and the sleeve.

Description

technical field [0001] The present invention relates to an image forming apparatus such as a copying machine and a printer that visualizes an electrostatic image formed on an image carrier with toner to obtain an image. More specifically, it relates to an image forming apparatus using a two-component developer including a toner and a carrier as a developer. Background technique [0002] Conventionally, in image forming apparatuses such as copiers and printers using electrophotography, after uniformly charging the surface of an electrophotographic photoreceptor (hereinafter simply referred to as "photoreceptor") as an image carrier, the image information is correspondingly charged. The surface is exposed. Thus, an electrostatic image (latent image) is formed on the surface of the photoreceptor. The developer uses a developer to develop the electrostatic image formed on the photoreceptor as a toner image. The toner image on the photoreceptor is transferred to the transfer m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/00G03G5/04
CPCG03G15/02G03G15/065G03G15/16G03G2215/0602G03G2215/0634
Inventor 宫泽知明山本毅原口真奈实久保健太堀江寿云
Owner CANON KK