Developing roller, developing device, process cartridge, and image forming apparatus

A developing device and developer technology, applied in the field of developing rollers, can solve the problem of uneven image density, achieve good processing performance, increase the absorption amount, and ensure the effect of absorption amount

Inactive Publication Date: 2009-03-11
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the above reasons, the amount of toner supply on the developing roller is more in the middle part of the length direction than at both ends, causing the problem of uneven image density along the length direction of the developing roller

Method used

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  • Developing roller, developing device, process cartridge, and image forming apparatus
  • Developing roller, developing device, process cartridge, and image forming apparatus
  • Developing roller, developing device, process cartridge, and image forming apparatus

Examples

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Embodiment Construction

[0091] based on the following figure 1 One of the embodiments of the present invention is described through FIG. 8 . figure 1 It is a front view of the image forming apparatus according to one embodiment of the present invention. figure 2 yes figure 1 A cross-sectional view of a developing device related to one embodiment of the present invention among the image forming apparatuses shown. image 3 is along figure 2 Cross section on line III-III. Figure 4 is figure 1 A perspective view of the developer sleeve of the developer unit shown. Figure 5 is a plan view of the outer surface of the developed developing sleeve shown in Figure 4 .

[0092] figure 1 The illustrated image forming apparatus 101 can form yellow (Y), magenta (M), cyan (C), and black (K) color images on recording paper 107 as a transfer material. Hereinafter, Y, M, C, and K are appended to the tails of the device numbers corresponding to the respective colors of yellow, magenta, cyan, and black, r...

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PUM

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Abstract

The present invention provides a developing roller, a developing device, a process cartridge and an image forming device, which may inhibit the reduction of transmitting amount due to the aging variation, thus avoiding unevenness of image intensity. Specifically, the process cartridge of the image forming device comprises a developing roller with a fixed magnet roller and a developing sleeve (132). The outer surface of the developing sleeve has a plurality of recesses (139) of elliptic shape in plan view regularly or irregularly arranged therein so as not to overlap, and the long axis of the recess is in parallel with the length direction of the developing sleeve (132).

Description

technical field [0001] The present invention relates to a developing roller, a developing device, a process cartridge, and an image forming device used in copiers, facsimile machines, and printers. The developing area between the drums, the developing roller and the developing device that develop the electrostatic latent image on the photosensitive drum to form a toner image. The present invention also relates to a process cartridge and an image forming apparatus including the above-mentioned developing device. Background technique [0002] In an image forming apparatus, a developer is placed on a developing sleeve of a developing roller. Except for a low-speed machine, in order to reliably send the developer to the photosensitive drum, the outer surface of the above-mentioned developing sleeve is subjected to a process such as Patent Document 1 (JP Patent Laid-Open). 2003-255692 ), Patent Document 2 (JP Unexamined No. 2004-191835 ), and Patent Document 3 (JP Unexamined No....

Claims

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Application Information

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IPC IPC(8): G03G15/09G03G15/08G03G21/18G03G15/01
Inventor 小岛敏男肥塚恭太铃木励
Owner RICOH KK
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