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Developing apparatus

A developing device and developing agent technology, applied in the direction of instruments, electrical recording process equipment using charge patterns, optics, etc., can solve the problems that hinder the miniaturization of the image forming device as a whole and hinder the miniaturization of the developing device 101, etc.

Inactive Publication Date: 2008-02-06
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, not only the size reduction of the developing device 101 but also the size reduction of the image forming apparatus as a whole are hindered.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0036] FIG. 1 shows a schematic cross-sectional view of an example of an image forming apparatus 100 to which the present invention is applied. The image forming apparatus 100 of this embodiment has four image forming sections 50Y, 50M, 50M, 50M, and 50C, 50K color electrophotographic image forming apparatus. Fig. 1: The image forming apparatus 100, based on the image information signal from an external host such as a personal computer communicably connected to the apparatus main body A, or from a document reading device attached to or communicably connected to the apparatus main body A, can be A color image is formed on a recording material P such as recording paper, OHP sheet, cloth, or the like.

[0037] First, the overall operation of the image forming apparatus 100 will be described. In the twentieth embodiment, the image forming units 50Y, 50M, 50C, and 50K included in the image forming apparatus 100 basically have the same configuration, and the colors of the images f...

experiment example 1

[0073] In this experiment, 1 g of toner was supplied at the toner supply position T, and the charged amount of the supplied toner at the first communicating portion 23 was measured. Furthermore, in this experiment, the inclination of the stirring chamber 22 to the horizontal direction (the upward gradient from the second communicating portion 24 side to the first communicating portion 23 side) (hereinafter simply referred to as “inclination”) θ is taken as 0° (horizontal), 1°, 2°, 5°, 10°, 12°. Each tested developing device had the same configuration except for this inclination.

[0074] The experimental results are shown in Table 1. For the chargeability of the toners in Table 1, the chargeability of 3000 toners was measured with an E-Spart analyzer manufactured by Hosokawa Micron Co., Ltd., and it was good (○) when substantially all the toners were negative polarity. , when the toner was not triboelectrically charged (the charge amount was 0) or was positively polarized, i...

Embodiment 2

[0102] Next, another embodiment of the present invention will be described with reference to FIG. 5 . In this embodiment, the present invention is embodied in an image forming apparatus equipped with the same developing device as in Embodiment 1, and the basic configurations of the developing device and the image forming apparatus are the same as those in Embodiment 1. Therefore, elements having the same or equivalent configurations and functions as those of Embodiment 1 are given the same reference numerals, and detailed description thereof will be omitted.

[0103] In the developing device 1 of this embodiment, as shown in FIG. 5, like the developing device 1 described in Embodiment 1, the bottom surface 22a of the stirring chamber 22 has an inclination of 5° with respect to the horizontal direction (from the side of the second communicating portion 24). 1st connecting part 23 side uphill gradient).

[0104] Moreover, in this embodiment, at the first communicating portion 2...

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Abstract

A developing apparatus having a developer carrying member for carrying and conveying developer including toner and carrier to a portion opposed to an image bearing member, a first chamber for supplying the developer to the developer carrying member, a first conveying portion disposed in the first chamber for conveying the developer, a second chamber for supplying the developer to the first chamber, a second conveying portion disposed in the second chamber for conveying the developer, and a receiving port for receiving a supplied toner, wherein the developer is circulated between the first chamber and the second chamber by the first and the second conveying portion, the second conveying portion is inclined so that the downstream side in a developer conveying direction may be upper in the direction of gravity, and the supplied toner from the receiving port is supplied from just above the second conveying portion in the direction of gravity to the second conveying portion.

Description

technical field [0001] The present invention relates to a developing device used in image forming devices using electrophotography or electrostatic recording, such as copiers, printers, and facsimile machines. Background technique [0002] As the demand for color images increases in recent years, cost reduction and miniaturization of image forming apparatuses that perform color image formation are also required, similarly to monochrome image forming apparatuses. [0003] Conventional image forming apparatuses that use electrophotography, especially color image forming apparatuses that perform color image formation, have widely used a mixture of non-magnetic toner (toner) and magnetic carrier (carrier) as a developer. Two-component developing method. Compared with other developing methods currently proposed, the two-component developing method has the advantages of image quality stability, device durability, and the like. [0004] In a developing device using a two-component...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/08G03G15/00
CPCG03G15/0839G03G15/0877G03G15/0893
Inventor 有元孝太
Owner CANON KK
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