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Image forming apparatus with charging device of corona type

一种电晕充电器、图像的技术，应用在电晕放电装置、应用电荷图形的电记录工艺的设备、应用电荷图形的电记录工艺等方向，能够解决降低图像形成设备生产率、长的时间等问题

Inactive Publication Date: 2010-06-23
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, the image forming apparatus is configured to open its shutter after the image forming signal is input, which makes it take an unnecessarily long time for the image forming apparatus to start forming an image after the start button is pressed, so Reduced productivity of the image forming apparatus

Method used

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  • Image forming apparatus with charging device of corona type
  • Image forming apparatus with charging device of corona type
  • Image forming apparatus with charging device of corona type

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The image forming apparatus in the first preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. However, unless otherwise specified, the size, material, and shape of the structural members of the image forming apparatus in this embodiment and the positional relationship therebetween are not intended to limit the scope of the present invention. In addition, "leakage of a large amount of electric charge from the surface of the photosensitive drum" that leads to formation of an undesired blurred and / or dull image refers to a phenomenon in which the surface of the photosensitive drum is The electrical resistance is reduced, and thus the charge on a portion of the surface of the photosensitive drum is greatly reduced.

[0019] 1. Image forming equipment

[0020] figure 1 is a sectional view of the image forming apparatus in the first preferred embodiment of the present invention, and shows the structur...

Embodiment 2

[0051]The image forming apparatus in the second preferred embodiment including the features listed below is structurally the same as the image forming apparatus 50 in the first preferred embodiment. That is, when the image forming apparatus is switched from the standby mode to the sleep mode due to the pressing of the soft switch or the elapse of a preset length of time, the photosensitive drum 1 is relatively charged to the primary charging device 2 by the shielding operation of the charging device shutter 10 . The opening is covered. Furthermore, in order to remove the discharge by-products on the surface of the photosensitive drum 1 by the cleaning device 7, before the photosensitive drum 1 is shaded by the charging device shutter 10, immediately before the charging device shutter 10 begins to shade the photosensitive drum 1, restart The photosensitive drum 1 is rotated. Therefore, even if the image forming apparatus 50 is not used for a long time in a high-humidity enviro...

Embodiment 3

[0065] The image forming apparatus in the third preferred embodiment including the following features is substantially the same in structure as the image forming apparatus in the first preferred embodiment. That is, the opening of the photosensitive drum 1 with respect to the primary charging device 2 is shielded by the charging device shutter 10 when a preset length of time elapses after the formation of the last image ends. In addition, immediately before starting the shielding operation of the charging device shutter 10, the photosensitive drum 1 is rotated without forming an image to remove the discharge secondary accumulated on the surface of the photosensitive drum 1 until then by the cleaning device 7. product. Since the discharge by-products are removed from the surface of the photosensitive drum 1, even if the image forming apparatus is left unused for a long period of time in an environment where the discharge by-products may absorb moisture, a large leakage of charg...

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PUM

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Abstract

An image forming apparatus with a charging device of corona type includes a rotatable photosensitive member; a corona charger provided with an opening opposed to a surface of the photosensitive member; image forming means for forming a toner image on the photosensitive member; a shutter for opening and closing the opening relative to the photosensitive member; sliding means for sliding in contact with the photosensitive member; measuring means for measuring time elapsed from end of image formation; and control means for controlling the apparatus on the basis of an output of the measuring means such that shutter is closed and the photosensitive member is rotated in contact with the sliding means.

Description

technical field [0001] The present invention relates to an image forming apparatus such as a printer, a copier, and a facsimile equipped with a corona-type charging device. Background technique [0002] The electrophotographic image forming apparatus is equipped with a charging device for charging the photosensitive member. Specifically, some electrophotographic image forming apparatuses are equipped with a corona-type charging device. Therefore, in the case of an electrophotographic image forming apparatus equipped with a scorotron-type charging device, ozone (O 3 ), nitrogen oxides (NO x ) and other discharge by-products. Some by-products generated by corona discharge accumulate on the surface of the photosensitive member. Therefore, if an electrophotographic image forming apparatus equipped with a corona-type charging device is used in a high-humidity environment, byproducts on the surface of the photosensitive member may absorb moisture from the air, and thus parts o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/00G03G15/02
CPCG03G15/5008G03G2215/1609G03G15/0291G03G15/02G03G2215/027G03G2215/00573G03G15/14
Inventor 中岛正敦
Owner CANON KK