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Development apparatus and image forming apparatus

A developing device and latent image technology, which are applied in the fields of electric recording technology using charge patterns, equipment for electric recording technology using charge patterns, and electrography, etc.

Inactive Publication Date: 2009-06-03
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present inventors have found through experiments that when such an application method is adopted, a phenomenon called scum, in which toner adheres to the plain portion of the latent image carrier (the portion where the latent image obtained by exposure, etc. is not written), is likely to occur.

Method used

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  • Development apparatus and image forming apparatus
  • Development apparatus and image forming apparatus
  • Development apparatus and image forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0058] First, experiments of the present invention will be described. Such as figure 1 As shown, by evaporating aluminum on a glass substrate 1, an electrode pattern 2 consisting of a plurality of electrodes 21, 22, 23... arranged at a pitch of p (μm) along the moving direction is formed, and serves as a protective layer thereon. 3 Form a structure in which a resin coating layer with a thickness of about 3 (μm) and a volume resistivity of about 10^10 (Ω·cm) is applied to form a substrate 4 as a toner carrier, and form a charged toner on the substrate 4. Toner layer 5.

[0059] The toner layer 5 is formed by developing a solid image on a thin layer with a two-component developer not shown on the substrate 4 . A polyester-based toner having a particle diameter of about 6 (μm) was used, and the charge amount of the toner in a state where a thin layer was formed on the substrate 4 was about −22 (μC / g). With respect to the toner layer 5 in this state, as figure 2 As shown, whe...

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PUM

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Abstract

The invention relates to an apparatus for developing a latent image on a latent image carrier includes a toner carrier and multiple electrodes arranged at intervals on a surface of the toner carrier. A potential difference is formed between even-numbered electrodes and odd-numbered electrodes of the electrodes by applying a first pulse voltage to the even-numbered electrodes and a second pulse voltage to the odd-numbered electrodes as an applying figure 15, so that toner on the surface of the toner carrier moves back and forth between the electrodes, wherein the first and second pulse voltages are in different phases, and the toner moving back and forth between the electrodes is conveyed to a position facing the latent image carrier by movement of the surface of the toner carrier and thereby caused to adhere to the latent image on the latent image carrier.

Description

technical field [0001] The present invention relates to a developing device and image forming devices such as copiers, printers, and facsimile machines that form images using the developing device. Background technique [0002] Conventionally, as such a developing device, it is known that not only the toner adsorbed on the developing roller or the magnetic carrier is used for development, but also the developer that jumps on the surface of the toner carrier such as the toner carrying substrate is used for the development. development. [0003] For example, the developing device described in Patent Document 1 has a cylindrical toner carrier including a plurality of electrodes arranged at predetermined pitches in the circumferential direction. These electrodes are formed by repeatedly arranging electrode pairs consisting of two electrodes adjacent to each other. An alternating electric field is formed between the two electrodes of each electrode pair. Thus, the toner on one...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/08G03G15/00
Inventor 塚本武雄近藤信昭堀家正纪高桥朋子山田正明小杉秀树门田一郎中川悦典石井保之
Owner RICOH KK