Developing roller and imaging device

Abstract

The invention provides a developing roller. The developing roller comprises a metal central spindle, and a conductive elastomer covering the metal central spindle, wherein a conductive agent in the conductive elastomer is a mixture containing tetrabutylammonium perchlorate and polyethyleneglycol with an amount being 5% to 50% of weight parts of the conductive elastomer, wherein the ratio of the tetrabutylammonium perchlorate to polyethyleneglycol is equal to 2:8 to 6:4. The invention also provides an imaging device including the developing roller. The developing roller provided by the invention has uniform electric property, can adjust the electric property to obtain uniform resistance, and can ensure that the resistance of the developing roller has low environmental dependency and low voltage dependency, i.e. excellent environmental stability and voltage stability, without increasing hardness of the elastomer. Additionally, the developing roller can prevent the conductive agent from being separated out, and a photosensitive drum is not contaminated, thereby effectively obviating printing defects, such as nonuniform printed images. An imaging apparatus using the developing roller has the advantages of uniform density of printed images, high image quality and high quality.

Description

【Technical field】 [0001] The invention relates to a developing roller, especially a developing roller and an imaging device used in printers and copiers to transfer toner to an electrostatic latent image bearing structure (photosensitive drum) so that the electrostatic latent image forms a visible toner image. 【Background technique】 [0002] Generally, printers and copiers are constructed by carrying an electrostatic latent image (also known as a photosensitive drum), a charging roller that charges the photosensitive drum, a developing roller that transfers toner to the photosensitive drum so that the electrostatic latent image forms a visible toner image, and Toner is composed of conductive rubber rollers such as transfer rollers that are transferred from photosensitive drums to other media. [0003] In recent years, imaging devices represented by printers have been widely popularized in people's daily life, and miniaturization of printers has become a trend. Against this ...

AI Technical Summary

Problems solved by technology

[0009] 1) The processability of chloroether rubber is very poor, and the compression permanent deformation is large;

[0010] 2) Chlorine ether rubber is the main rubber. Chlorine ether rubber contains chlorine and has high surface free energy. In this way, toner and additives in toner are easy to adhere to the surface of epichloride rubber, and the toner adheres to the developing roller. The surface has little effect on the initial charged image, but as the printing progresses, defects such as ghosts and bottom dust will occur;

[0011] 3) Chlorine ether rubber is a strong polar rubber with ion conductivity, and the environmental stability of the rubber itself is very poor;

[0012] 4), tetrabutylammonium perchlorate or N-butyl-3-methylpyridinium bis(trifluoromethanesulfonyl) imide are very expensive, and tetrabutylammonium perchlorate or N- Butyl-3-methylpyridinium bis(trifluoromethanesulfonyl)imide does not guarantee good environmental stability

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