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Developing device and image forming apparatus

A developing device, latent image technology, applied in the direction of electric recording process applying charge pattern, equipment for applying electric recording process of charge pattern, electric recording technique, etc. The shape and arrangement method are not uniform and scattered.

Inactive Publication Date: 2007-05-09
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In this developing device, when the unevenness of the surface of the toner particle carrying roller is formed by sandblasting, the size, depth, shape, and arrangement method of the concave portions are not uniform
Therefore, for example, toner particles entering deep recesses cannot be charged well because they are not rolled.
In this way, due to the non-uniform unevenness of the unevenness on the surface of the toner particle carrying roller, there is a possibility that the charge failure of the toner particles locally occurs, or the toner particles enter small recesses to cause filming.
In addition, if the toner particles are not well charged, there is a problem that the toner particles leak from the developing device and disperse into the image forming device, or generate fog on the image, etc.

Method used

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  • Developing device and image forming apparatus

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Experimental program
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no. 2 approach to no. 4 approach

[0165] [Other Embodiments (Second Embodiment to Fourth Embodiment, etc.)]

[0166] The developing device and the like according to the present invention have been described above based on the above-mentioned embodiments, but the above-mentioned embodiments of the invention are only for making the present invention easier to understand, and are not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and of course equivalents thereof are also included in the present invention.

[0167] In the above-mentioned embodiments, an image forming apparatus has been described taking a full-color laser printer as an example, but the present invention can also be applied to various image forming apparatuses such as monochrome laser printers, copiers, and facsimile machines.

[0168] In addition, in the above-mentioned embodiment, the example in which the printer has a plurality of attaching and detachable parts ...

no. 2 approach

[0172] >

[0173] Here, a configuration example of the developing roller 510 of the developing device according to the second embodiment will be described with reference to FIGS. 15 to 18 . FIG. 15 is a schematic perspective view of the developing roller 510, showing the spiral first groove 1518a and the second groove 1518b with different winding directions. FIG. 16 is a schematic front view of the developing roller 510 , showing the positional relationship of the uneven processed portion 1512 , the non-embossed processed portion 1514 , and the intermediate portion 1516 of the developing roller 510 . FIG. 17 is a schematic diagram of the cross-sectional shape of the trench 1518 . FIG. 18 is a schematic cross-sectional view of A-A of FIG. 16 , showing the difference between the depth of the groove 1518 of the concave-convex processed part 1512 and the depth of the groove 1518 of the middle part 1516 . In FIGS. 15 to 18 , the scales of the grooves 1518 and the like are differe...

no. 3 approach

[0202] >

[0203] Here, a configuration example of the developing roller 510 of the developing device according to the third embodiment will be described with reference to FIGS. 19 to 22 . FIG. 19 is a schematic perspective view of the developing roller 510, showing the helical first groove 2518a and the second groove 2518b whose winding directions are different from each other. 20 is a schematic front view of the developing roller 510 showing the positional relationship between the groove-forming portion 2512 and the non-grooving-forming portion 2514 of the developing roller 510 . FIG. 21 is a schematic diagram of the cross-sectional shape of the groove 2518 . FIG. 22 is a schematic cross-sectional view of A-A of FIG. 20 , showing the difference between the depth of the groove 2518 in the central portion 2512a and the depth of the groove 2518 in the two end portions 2512b. In addition, in FIGS. 19 to 22 , the scales of the grooves 1518 and the like are different from actual...

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Abstract

A developing device includes a container that contains toner particles that are for developing a latent image borne by an image bearing body, and a toner-particle bearing roller that has a helical groove portion on a surface thereof that is for bearing the toner particles, the helical groove portion having an inclination with respect to an axial direction and a circumferential direction of the toner-particle bearing roller and being formed having a uniform pitch in the axial direction.

Description

technical field [0001] The present invention relates to a developing device and an image forming device. Background technique [0002] A developing device that performs development using toner particles is known as a developing device having a toner particle carrying roller for carrying toner particles accommodated in a toner particle container and performing development. . [0003] In order to limit the layer thickness of the toner particles carried by the toner particle carrying roller and to charge the toner particles, such a developing device is provided with a layer thickness that is in contact with the toner particle carrying roller that carries the toner particles. Limit parts. In addition, the surface of the toner particle carrying roller is subjected to sand blasting so that fine irregularities are provided on the surface. The toner particles are carried on the surface of the toner particle carrying roller and pressed by the layer thickness regulating member, whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/08G03G15/00
Inventor 山田阳一有贺友洋樱井升功刀正尚冈本克巳加藤洋
Owner SEIKO EPSON CORP
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