Image forming apparatus and processinh caddy

Abstract

The present invention relates to image forming devices such as copiers, facsimile machines, and printers, and process cartridges. The film thickness of the image carrier is predicted from the number of revolutions of the image carrier, and the optimum exposure conditions are calculated based on the predicted film thickness of the image carrier and the target uniform charging potential Vd. This provides an image in which optimal exposure conditions corresponding to both the uniform charging potential of the image carrier and the film thickness of the image carrier can be obtained, and an image can be formed from the start of setting the optimal exposure condition to the end of the setting. Forming device and process cartridge.

Description

technical field [0001] The present invention relates to image forming devices such as copiers, facsimile machines, and printers, and process cartridges. Background technique [0002] Generally, in an image forming apparatus, a charging roller, a transfer roller, a developer, a cleaning blade, a cleaning brush, etc. are provided, and these are in contact with the surface of an image carrier. As the image carrier rotates, its surface is gradually abraded. As a result, there arises a problem that the film thickness of the charge transport layer forming the surface layer of the photoreceptor gradually becomes thinner, and the exposure sensitivity of the photoreceptor fluctuates. If the exposure sensitivity changes, the light attenuation characteristic in which the uniform charge potential Vd decays to the post-exposure potential V1 changes, and the toner density of the halftone on the photoreceptor changes. [0003] For the above problems, the following methods can be consider...

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Problems solved by technology

However, in this case, the following problems will occur: it is necessary to form the above-mentioned latent image pattern on the surface of the photoreceptor, and the time from forming the latent image pattern on the surface of the photoreceptor to the end of setting the exposure conditions corresponding to the film thickness t cannot be form an image

The calculation method described in Patent Document 1 obtains the exposure amount based on the light attenuation characteristic corresponding to the film thickness, but since the fluctuation of the light attenuation characteristic relative to the above-mentioned uniform charging potential Vd is not taken into account, the toning on the photoreceptor occurs. The problem that the density of the agent image changes

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