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Electrizer and imaging device

A technology of electrification device and imaging device, applied in corona discharge device, circuit, electrography and other directions, can solve the problems of insufficient conductive particles, poor electrification, insufficient contact machine, etc.

Inactive Publication Date: 2007-01-10
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] When the pre-electrification operation is performed, sometimes due to the excessive shedding of the above-mentioned conductive particles, there will be insufficient conductive particles and insufficient contact opportunities, resulting in poor electrification.

Method used

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  • Electrizer and imaging device
  • Electrizer and imaging device
  • Electrizer and imaging device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0084] This embodiment is based on the printer of Embodiment 1, and is characterized in that: on the auxiliary electrification roller 31 of the contact electrification member of the roller electrification device 3 as the auxiliary electrification mechanism, such as Figure 4 As shown, cleaning members 35, 36 are provided. The configuration of other printers is the same as that of the printer of the first embodiment, so further description is omitted.

[0085] On the auxiliary electrification roller 31, due to the adhesion of fine particles such as toner additives passing through the cleaning plate 91 of the cleaning device 9, the roller surface layer becomes high in impedance, and the discharge threshold (electrification start voltage) Vth of contact electrification occurs. Changes, resulting in the change of the electromotive voltage. Therefore, in this embodiment, the scraper 35 made of PET material is brought into contact with the auxiliary electrifying roller 31 over the ...

Embodiment 3

[0088] This embodiment is based on the printer of Embodiment 1, by controlling the electrification bias applied to the auxiliary electrification roller 31 of the contact electrification member of the roller electrification device 3 as the auxiliary electrification mechanism, This prevents the conductive magnetic particles on the magnetic brush electrification device 2 as the main electrification mechanism from adhering to the photosensitive drum 1 . Figure 5 It is a structural diagram of this embodiment, and 37 is a current detector for detecting the amount of current flowing to the auxiliary electrifying roller 31 provided by the power supply S3. The detection result is fed back to the control circuit 10 . The control circuit 10 controls the power supply S1 based on the input detection result, and appropriately controls the applied bias voltage of the auxiliary electrifying roller 31 . Since other printer structures are the same as those of the printer in Embodiment 1, furt...

Embodiment 4

[0092] The main electrification mechanism 2 is not limited to the magnetic brush electrification devices in the above-mentioned embodiments, and it is also possible to use the contact electrification device using conductive particles as described in the Japanese Unexamined Publication No. 10-307454-307459. Likewise, conductive particles can be prevented from adhering to the photosensitive drum 1 .

[0093] Figure 7 It is a schematic structural model diagram of one example of this type of electromotive device 2 . This electrification device 2 has an electrification roller 27 as a contact electrification member, an electrification bias application power source S1 for this electrification roller 27 , and a conductive particle supplier 28 for this electrification roller.

[0094] The electrifying roller 27 is made up of a metal core 27a and an elastic intermediate resistance layer 27b. The elastic intermediate resistance layer 27b is used as a conductive particle carrier rubber ...

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Abstract

A charging device including: a first charger which charges a member to be charged, the first charger having conducting particles which come into contact with the member to be charged; a second charger which charges the member to be charged in a same polarity as charging polarity of the first charger on an upstream side of the first charger in a moving direction of the member to be charged; and a controller which controls application of a charging voltage to the first charger, in which the controller turns a charging voltage on or off in an area of the member to be charged which is not subjected to charging by the second charger.

Description

technical field [0001] The present invention relates to an image forming device such as an electrophotographic copier, printer, and the like, and a charging device suitable for the image forming device. Background technique [0002] In an image forming apparatus employing an electrophotography method, before an exposure step, first, a photoreceptor is uniformly electrified by an electrification mechanism. [0003] As an electrification method as this electrification mechanism, in recent years, an injection electrification method that does not involve a substantial discharge phenomenon has been considered. [0004] The injection electrification system is a system that directly injects charges from the contact electrification member to the photoreceptor to electrify the surface of the photoreceptor; it is a contact with the surface of the photoreceptor through a medium-impedance contact electrification member without going through the discharge phenomenon, that is, That is to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/02G03G15/00G03G5/00G03G5/08G03G5/147
CPCG03G15/0275
Inventor 太田光弘
Owner CANON KK