Image forming device

Abstract

An image forming apparatus is provided having a mechanism that toner density of a toner image is automatically adjusted based on a toner patch. In an image forming apparatus including a document conveying section, a document reading section, an image forming section, a sheet discharging section, a sheet feeding section, a patch density detecting section, and a toner density adjusting section for adjusting density of a toner image depending on a result detected by the patch density detecting section, there are further provided a patch forming section for forming a toner patch, an operation detecting section for detecting an operating state of the patch density detecting section, and a patch printing section for printing the toner patch in response to such a result detected by the operation detecting section that the patch density detecting section does not properly operate, thereby adjusting the toner density based on the patch image.

Description

technical field [0001] The present invention relates to an image forming apparatus. Background technique [0002] Image forming apparatuses using electrophotography (hereinafter referred to as “image forming apparatuses”) are widely used in various fields because they can print high-quality images on recording media with simple operations. An image forming apparatus includes, for example, a photosensitive drum, a charging unit, an exposure unit, a developing unit, a transfer unit, and a fixing unit. The photosensitive drum has a photosensitive layer on its surface. The charging unit charges the surface of the photosensitive drum to a predetermined polarity and potential. The exposure portion forms an electrostatic latent image on the surface of the photosensitive drum in a charged state. The developing section supplies toner to the electrostatic latent image on the surface of the photosensitive drum and forms a toner image. The transfer section transfers the toner image ...

AI Technical Summary

Problems solved by technology

However, in the image forming apparatus disclosed in Japanese Unexamined Patent Publication No. 6-301257, the control is performed based on the differential pressure, so when the voltage value output by the patch density detection section gradually fluctuates, even if the patch density detection section malfunctions, it will not Sufficiently reflected to the adjusted value, proper control cannot be performed

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