Image forming apparatus and image density control method

An imaging device and image technology, applied to the equipment of the electric recording process using the charge pattern, the electric recording process using the charge pattern, and the electric recording technique, etc., can solve the problem that the image density cannot be controlled

Inactive Publication Date: 2010-09-08
RICOH KK
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0010] However, such an image forming apparatus cannot respond to changes in developing ability caused by factors other than the amount of toner replacement within a predetermined period of time in the developing device, such as environmental changes, downtime, etc.
Therefore, the image density cannot be properly controlled by the inventions proposed in these background art

Method used

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  • Image forming apparatus and image density control method
  • Image forming apparatus and image density control method
  • Image forming apparatus and image density control method

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Embodiment Construction

[0028] First, an outline of the present invention will be described.

[0029] As described above, a constant image density cannot be obtained due to a change in developing capability due to a difference in the amount of newly replenished toner or old toner in the developing device. Therefore, in the present invention, information for knowing the amount of toner replacement after a predetermined period of time has elapsed is detected. From this information, the amount of toner consumed by the developing device within a predetermined period of time and the amount of newly replenished toner required can be known. In other words, the ratio of new toner or the ratio of old toner in the developing device can be known. Therefore, the developing ability can be known, and therefore, on the basis of the information detection result, the toner density control reference value can be corrected by the first toner density control reference value adjusting means, so that the developing abili...

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PUM

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Abstract

In an image forming apparatus and an image density control method that are capable of suppressing the amount of toner consumed for a purpose other than image formation and responding to variation in the development ability of a development device due to environmental variation and the like such that a constant image density is obtained, the image density is maintained at a substantially fixed level by first target output value correcting means in accordance with a toner replacement amount and without consuming toner, and adjustment of the image density accompanying variation in the development ability due to environmental variation and the like is dealt with by second target output value correcting means in accordance with a toner pattern detection result. Hence, the frequency with which the toner pattern is detected in order to maintain the image density at a fixed level can be reduced in comparison with a case in which the image density is maintained at a fixed level on the basis ofthe toner pattern detection result alone, and as a result, the toner consumption amount can be suppressed.

Description

technical field [0001] The present invention relates to an image forming apparatus such as a copying machine, a printer, or a facsimile apparatus that forms an image using a two-component developer composed of toner and a magnetic carrier, and to an image density control method. Background technique [0002] In the related art, a two-component developing system has been known. In this two-component developing system, a binary developer composed of toner and a magnetic carrier (hereinafter referred to simply as "developer") is held on a developer carrier, and the developer is used to The magnetic poles inside the carrier form a magnetic brush, and the developing operation is accomplished by sliding the magnetic brush over the latent image formed on the latent image carrier. Since color images can be easily formed with it, this two-component developing system is widely used. In a two-component developing system, when the toner concentration, that is, the ratio (for example, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/08G03G15/01G03G15/00
Inventor 竹内信贵石桥均藤森仰太田中加余子平山裕士渡辺直人
Owner RICOH KK
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