Image forming unit and displaying unit

Abstract

Any reduction in the dignity of image, any increase in the waiting time, any increase in toner consumption and waste toner, etc. are prevented. A memory is provided in a developing device detachably mountable to the main body of an image forming apparatus, and a main body memory is provided in the main body. The last optimum bias stored in the memory in the developing device and the newest development bias are compared with each other (S14), and on the basis of the difference ”Di therebetween, the interval at which density detection is effected is changed. When ”Di‰¥A, the interval is shortened (S18), and when A>”Di‰¥B, the interval is not changed, and when B>”Di, the interval is lengthened. Thereby, necessary minimum density control is effected to thereby prevent any reduction in the dignity of image and any increase in the waiting time.

Description

technical field [0001] The present invention relates to image forming apparatuses such as printers and copiers. Background technique [0002] In image forming apparatuses such as printers and copiers, a density control device that automatically adjusts the density of an output image (for example, a toner image) to an appropriate density is generally provided. In particular, in an image forming apparatus that outputs four-color full-color toner images, more accurate density control for each color toner image of yellow, magenta, cyan, and black is required in order to obtain a desired color balance. [0003] Density detection is performed by a method in which a toner image (hereinafter referred to as a patch image as appropriate) of a specific halftone pattern according to area gradation is formed on a photosensitive drum (image bearing member) and used A reflected light amount sensor composed of a light emitting element and a light receiving element measures the amount of re...

AI Technical Summary

Problems solved by technology

However, on the contrary, there is such a disadvantage for the user that since no image is formed during the density control, the time in the density control is not only useless time, but also the toner is wasted in vain by forming interleaved images. , and, unnecessarily increases waste toner

In this case, as described above, an increase in user's waiting time, consumption of toner, and increase in waste toner will be incurred.

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