JPH11161120A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH11161120A JPH11161120A JP9324836A JP32483697A JPH11161120A JP H11161120 A JPH11161120 A JP H11161120A JP 9324836 A JP9324836 A JP 9324836A JP 32483697 A JP32483697 A JP 32483697A JP H11161120 A JPH11161120 A JP H11161120A
- Authority
- JP
- Japan
- Prior art keywords
- charging roller
- charging
- photoreceptor
- image forming
- photoconductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 108091008695 photoreceptors Proteins 0.000 claims abstract description 24
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 17
- 238000004140 cleaning Methods 0.000 claims description 27
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 abstract description 20
- 230000002159 abnormal effect Effects 0.000 abstract description 7
- 230000000717 retained effect Effects 0.000 abstract 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、感光体の表面に
圧接した状態でその感光体を帯電する帯電ローラと、そ
の帯電ローラの表面に作像中も当接してその帯電ローラ
の表面をクリーニングするクリーニング部材とを備えた
画像形成装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging roller for charging a photoreceptor while being pressed against the surface of the photoreceptor, and cleaning the surface of the charging roller by contacting the surface of the charging roller during image formation. And an image forming apparatus provided with the cleaning member.
【０００２】[0002]
【従来の技術】電子写真方式の画像形成装置には、感光
体の表面を帯電する帯電装置が設けられているが、近年
この帯電装置として、コロナ放電方式のものから帯電ロ
ーラを感光体の表面に接触させた状態で帯電を行なう接
触帯電方式の帯電装置が、オゾンの発生が少ない等の利
点があることから、多く使用されるようになってきてい
る。このような接触帯電方式の帯電装置は、帯電ローラ
が感光体に接触した状態で帯電が行なわれるため、感光
体上の画像を転写紙に転写した後に感光体上に残った残
留トナーが帯電ローラに付着することによって帯電不良
を起こす恐れがある。2. Description of the Related Art An electrophotographic image forming apparatus is provided with a charging device for charging the surface of a photoreceptor. In recent years, the charging device has been changed from a corona discharge type to a charging roller. 2. Description of the Related Art Contact-charging type charging devices, which perform charging in a state where they are in contact with, have advantages such as low generation of ozone, and have been increasingly used. In such a contact charging type charging device, the charging is performed while the charging roller is in contact with the photoreceptor, so that the residual toner remaining on the photoreceptor after transferring the image on the photoreceptor to transfer paper is transferred to the charging roller. May cause charging failure.
【０００３】そこで、このように帯電ローラを感光体に
接触させた状態で帯電を行なう接触帯電方式の帯電装置
では、例えばスポンジ等からなるローラクリーニング部
材を帯電ローラの表面に適量食い込ませるように接触さ
せ、それによって帯電ローラが回転したときにその表面
をローラクリーニング部材で摺擦して、その表面に付着
したトナーや紙粉等の付着物（異物）を除去するように
している（例えば特開平２−２７２５９４号公報参
照）。Therefore, in a contact-charging type charging device that performs charging in a state where the charging roller is in contact with the photosensitive member, a roller cleaning member made of, for example, a sponge is contacted so as to bite into the surface of the charging roller. When the charging roller rotates, the surface of the charging roller is rubbed with a roller cleaning member to remove extraneous matter (foreign matter) such as toner and paper powder adhered to the surface (for example, see Japanese Patent Laid-Open No. 2-2-2594).
【０００４】このようなローラクリーニング部材は、帯
電ローラの表面に対して接離可能なものと、常に帯電ロ
ーラの表面に圧接状態にあるもの（常接）とがある。そ
して、装置全体を小型化しようとする場合には、そのロ
ーラクリーニング部材は帯電ローラの表面に対して接離
させない常接タイプのものを採用した方が、機構が簡単
であるため有利である。[0004] Such roller cleaning members include those that can be brought into contact with and separated from the surface of the charging roller and those that are always in pressure contact with the surface of the charging roller (normal contact). In order to reduce the size of the apparatus as a whole, it is advantageous to adopt a normal type in which the roller cleaning member does not come in contact with or separate from the surface of the charging roller because the mechanism is simpler.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、このよ
うな接触帯電方式の帯電装置は、オゾンの発生が少ない
とはいっても微少なオゾンは発生する。そして、そのオ
ゾンは、帯電ローラにローラクリーニング部材が常時接
触しているものでは、そのローラクリーニング部材が帯
電ローラの回りの気流を停滞させるように働いてしまう
ため、その帯電ローラの回りに窒素酸化物(ＮＯｘ)が発
生して、それによって異常画像になってしまう場合があ
るということがあった。However, in such a charging device of the contact charging type, a small amount of ozone is generated even though the generation of ozone is small. If the roller cleaning member is in constant contact with the charging roller, the ozone will cause the airflow around the charging roller to stagnate. In some cases, an object (NOx) is generated, which results in an abnormal image.
【０００６】特に、図３に示すように、帯電ローラ４９
と感光体１とが略水平方向に配設されて横の位置で接す
るタイプのものでは、その感光体１と帯電ローラ４９と
の圧接位置に対して感光体１の回転方向上流側に形成さ
れるＶ字部４３に、空気よりも重いオゾンが溜り易いの
で、上述したような異常画像が発生しやすいということ
があった。In particular, as shown in FIG.
In the type in which the photosensitive member 1 and the photosensitive member 1 are disposed substantially horizontally and contact each other at a horizontal position, the photosensitive member 1 is formed on the upstream side in the rotation direction of the photosensitive member 1 with respect to the pressure contact position between the photosensitive member 1 and the charging roller 49. Ozone, which is heavier than air, tends to accumulate in the V-shaped portion 43, so that the above-described abnormal image is likely to occur.
【０００７】この発明は、上記の問題点に鑑みてなされ
たものであり、帯電ローラの回りにオゾンが溜ることに
よって異常画像が発生するようなことがないようにする
ことを目的とする。[0007] The present invention has been made in view of the above problems, and has as its object to prevent an abnormal image from being generated due to accumulation of ozone around a charging roller.
【０００８】[0008]
【課題を解決するための手段】この発明は上記の目的を
達成するため、回転する感光体と、その感光体の表面に
圧接した状態でその感光体を帯電する帯電ローラと、そ
の帯電ローラの表面に作像中も当接して帯電ローラの表
面をクリーニングするクリーニング部材とを備えた画像
形成装置において、感光体と帯電ローラとが圧接する圧
接位置に対して感光体の回転方向上流側に、上記圧接位
置の上記回転方向上流側近傍に気流を発生させる気流発
生手段を設けたものである。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a rotating photosensitive member, a charging roller for charging the photosensitive member while being pressed against the surface of the photosensitive member, and a charging roller for charging the photosensitive member. In an image forming apparatus provided with a cleaning member that abuts even during image formation on the surface to clean the surface of the charging roller, an upstream side in the rotation direction of the photoconductor with respect to a pressure contact position where the photoconductor and the charging roller press against each other, An airflow generating means for generating an airflow near the upstream side in the rotation direction of the pressing position is provided.
【０００９】このようにすれば、帯電ローラの配設位置
が、その帯電ローラと感光体とが圧接した部分の付近に
オゾンが溜りやすい位置にあるときでも、その帯電ロー
ラと感光体とが圧接する圧接位置に対して感光体の回転
方向上流側には、気流発生手段により気流が発生するの
で、その気流によりオゾンがそこに溜らない。With this configuration, even when the charging roller is located at a position where ozone easily accumulates in the vicinity of the portion where the charging roller and the photosensitive member are in pressure contact, the charging roller and the photosensitive member are in pressure contact with each other. Since the airflow is generated by the airflow generation means on the upstream side in the rotation direction of the photoconductor with respect to the pressing position, the ozone does not accumulate there due to the airflow.
【００１０】また、回転する感光体と、その感光体の表
面に圧接した状態でその感光体を帯電する帯電ローラ
と、帯電ローラの表面に作像中も当接してその帯電ロー
ラの表面をクリーニングするクリーニング部材とを備
え、その帯電ローラとクリーニング部材をケース内に収
めると共に、そのケースで感光体の表面の一部を覆うよ
うにした画像形成装置において、上記ケースに、感光体
と帯電ローラとが圧接する圧接位置に対して感光体の回
転方向上流側で上記圧接位置の近傍を通った気流をケー
ス外部に流出させる開口を設けるとよい。A rotating photoreceptor, a charging roller for charging the photoreceptor in pressure contact with the surface of the photoreceptor, and cleaning the surface of the charging roller by contacting the surface of the charging roller during image formation; An image forming apparatus that includes a cleaning member that covers the surface of the photoconductor with the charging roller and the cleaning member housed in the case. It is preferable to provide an opening for letting an airflow passing through the vicinity of the pressing position on the upstream side in the rotation direction of the photoconductor with respect to the pressing position where the pressure contact is made to flow out of the case.
【００１１】そうすれば、帯電ローラとクリーニング部
材とを収めたケースに形成された開口を通して、ケース
内の空気がケース外に流出するので、帯電時に発生した
オゾンが感光体と帯電ローラとの圧接位置の近傍に溜ら
ないようにすることができる。[0011] Then, the air in the case flows out of the case through the opening formed in the case containing the charging roller and the cleaning member, so that the ozone generated at the time of charging is pressed against the photosensitive member and the charging roller. It can be prevented from accumulating near the position.
【００１２】そして、感光体と帯電ローラとが略水平方
向に配設されて互いに圧接している場合には、上記のよ
うな気流発生手段を設けたり、ケースに開口を形成した
りすれば、より効果的である。In the case where the photosensitive member and the charging roller are arranged in a substantially horizontal direction and are in pressure contact with each other, if the above-described airflow generating means is provided or an opening is formed in the case, More effective.
【００１３】[0013]
【発明の実施の形態】以下、この発明の実施の形態を図
面に基づいて説明する。図１はこの発明の一実施形態例
である画像形成装置の作像部を示す概略構成図である。
この画像形成装置は、矢示Ａ方向に回転するドラム状の
感光体（像担持体）１の回りに、その感光体１の表面に
接触した状態で図示しない電源から電圧が印加されるこ
とにより感光体１の表面に一様な電荷を帯電させる帯電
ローラ９を備えた帯電装置２と、感光体１上にレーザ光
Ｌを照射することにより静電潜像を形成する図示しない
露光装置と、その静電潜像を顕像化してトナー像とする
現像装置４とを設けている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an image forming unit of an image forming apparatus according to an embodiment of the present invention.
In this image forming apparatus, a voltage is applied from a power supply (not shown) around a drum-shaped photoconductor (image carrier) 1 rotating in the direction of arrow A while in contact with the surface of the photoconductor 1. A charging device 2 including a charging roller 9 for uniformly charging the surface of the photoconductor 1, an exposure device (not shown) that forms an electrostatic latent image by irradiating the photoconductor 1 with a laser beam L, And a developing device 4 that visualizes the electrostatic latent image to form a toner image.
【００１４】また、その感光体１の回りに、現像装置４
により形成されたトナー像を転写紙Ｐに転写する転写ロ
ーラ５と、そのトナー像を転写紙Ｐに転写した後に感光
体１上に残った残留トナーを除去するクリーニング装置
６と、感光体１上の残留電荷を除電する除電ランプ７も
設けている。A developing device 4 is provided around the photosensitive member 1.
A transfer roller 5 for transferring the toner image formed on the transfer paper P, a cleaning device 6 for removing residual toner remaining on the photoconductor 1 after transferring the toner image to the transfer paper P, There is also provided a static elimination lamp 7 for eliminating the residual charges of.
【００１５】帯電装置２の帯電ローラ９は、金属性の芯
金１２の両端部を除く外周に、吸湿性が小さく、抵抗値
が安定している導電性ゴム１３を装着したものであり、
その導電性ゴム１３の表面を感光体１の表面に常時圧接
させて従動回転可能な状態にあって、芯金１２に高電圧
が印加されることによって感光体１の表面を一様に帯電
する。The charging roller 9 of the charging device 2 is provided with a conductive rubber 13 having a small hygroscopic property and a stable resistance value mounted on the outer periphery of the metal core 12 except for both ends.
The surface of the conductive rubber 13 is constantly pressed against the surface of the photoreceptor 1 so that the surface can be driven and rotated. When a high voltage is applied to the cored bar 12, the surface of the photoreceptor 1 is uniformly charged. .
【００１６】その帯電ローラ９の表面には、ローラクリ
ーニング部材２２が常時圧接した状態にあり、そのロー
ラクリーニング部材２２は、例えばスポンジ等の発泡
体、あるいはブラシであり、それがクリーニング保持部
材２３に、例えば両面テープ等の接着剤で貼り付けてあ
る。したがって、帯電ローラ９の表面には、作像中もロ
ーラクリーニング部材２２が当接して、その表面がクリ
ーニングされる。また、感光体１と帯電ローラ９とが圧
接する圧接位置Ｔｐに対して感光体１の回転方向上流側
に、圧接位置Ｔｐの回転方向上流側近傍（図で左方）に
気流を発生させる気流発生手段である排風ダクト２４と
排風ファン２５とを設けている。A roller cleaning member 22 is always in pressure contact with the surface of the charging roller 9. The roller cleaning member 22 is, for example, a foam such as a sponge or a brush. , For example, with an adhesive such as a double-sided tape. Therefore, the roller cleaning member 22 is in contact with the surface of the charging roller 9 even during image formation, and the surface is cleaned. Further, an airflow that generates an airflow upstream in the rotation direction of the photoconductor 1 with respect to the pressure contact position Tp where the photoconductor 1 and the charging roller 9 are pressed against each other, and near the rotation direction upstream of the pressure contact position Tp (leftward in the figure). An exhaust duct 24 and an exhaust fan 25 as generating means are provided.
【００１７】この画像形成装置は、作像動作が開始され
ると、感光体１が矢示Ａ方向に回転を開始する。そし
て、その感光体１の表面が除電ランプ７から照射される
除電光により除電され、その部分の表面電位が０〜−１
５０Ｖの基準電位に平均化される。次に、帯電ローラ９
に電圧が印加されることにより感光体１が帯電され、そ
の感光体１の表面電位が−１０００Ｖ前後となる。In this image forming apparatus, when the image forming operation is started, the photosensitive member 1 starts rotating in the direction of arrow A. Then, the surface of the photoreceptor 1 is neutralized by static elimination light radiated from the static elimination lamp 7, and the surface potential of the portion becomes 0 to -1.
Averaged to a reference potential of 50V. Next, the charging roller 9
When the voltage is applied to the photosensitive member 1, the photosensitive member 1 is charged, and the surface potential of the photosensitive member 1 becomes about -1000V.
【００１８】その感光体１の帯電面には、図示しない露
光装置からレーザ光Ｌが照射され、そのレーザ光Ｌが照
射されることにより画像となる部分の表面電位が０〜−
２００Ｖとなる。したがって、現像装置４の現像スリー
ブ１０上のトナーがその画像となる部分に付着する。こ
のようにして、感光体１上に形成されたトナー像は、感
光体１が矢示Ａ方向に回転することにより、感光体１と
転写ローラ５とが接する転写位置に向けて移動されてい
く。The charged surface of the photoreceptor 1 is irradiated with a laser beam L from an exposure device (not shown), and the surface potential of an image forming portion when the laser beam L is irradiated is 0 to −−.
200V. Therefore, the toner on the developing sleeve 10 of the developing device 4 adheres to the portion where the image is formed. The toner image formed on the photoconductor 1 in this manner is moved toward the transfer position where the photoconductor 1 and the transfer roller 5 are in contact with each other as the photoconductor 1 rotates in the direction of arrow A. .
【００１９】一方、図示しない給紙部から転写紙Ｐが給
紙され、その転写紙Ｐはレジストローラ対８により、転
写紙Ｐの先端部が感光体１上に形成されているトナー像
の先端部と一致するタイミングで搬送され、その紙面に
感光体１上のトナー像が転写される。そして、その転写
紙Ｐは定着部へ搬送されて、熱と加圧力が加えられるこ
とによりトナー像が溶融定着され、その後で排紙トレイ
等に排出される。そして、その後に感光体１上に残った
残留トナーは、クリーニング装置６のクリーニングブレ
ード１１により掻き落とされ、その後感光体１の表面は
除電ランプ７により除電される。以降、この作像プロセ
スが繰り返される。On the other hand, a transfer paper P is fed from a paper supply unit (not shown), and the transfer paper P is moved by a pair of registration rollers 8 so that the leading end of the transfer paper P is the leading end of a toner image formed on the photoreceptor 1. The toner image on the photoconductor 1 is transferred onto the paper surface at the timing coincident with the copy. Then, the transfer paper P is conveyed to a fixing unit, where the toner image is melted and fixed by applying heat and pressure, and then discharged to a paper discharge tray or the like. Then, the residual toner remaining on the photoconductor 1 is scraped off by the cleaning blade 11 of the cleaning device 6, and thereafter, the surface of the photoconductor 1 is discharged by the discharge lamp 7. Thereafter, this image forming process is repeated.
【００２０】ところで、この画像形成装置のように、帯
電ローラ９が常時感光体１に圧接する常接タイプの帯電
装置２である場合には、帯電ローラ９が図１に示す矢印
方向に回転することによってその回りに気流が発生す
る。しかしながら、その空気の流れを帯電ローラ９の周
面の一部に常時接するローラクリーニング部材２２が変
えてしまうため、その気流は矢示Ｂの流れとなり、感光
体１と帯電ローラ９とが圧接する圧接位置Ｔｐの図１で
左方側にまでは回り込まない。In the case where the charging roller 9 is a normal contact type charging device 2 which constantly presses against the photosensitive member 1 as in this image forming apparatus, the charging roller 9 rotates in the direction of the arrow shown in FIG. This creates an airflow around it. However, the flow of the air is changed by the roller cleaning member 22 which is always in contact with a part of the peripheral surface of the charging roller 9, so that the air flow becomes as indicated by the arrow B, and the photosensitive member 1 and the charging roller 9 are pressed against each other. It does not turn to the left side of the press contact position Tp in FIG.
【００２１】したがって、この状態では、その感光体１
と帯電ローラ９とが圧接する圧接位置Ｔｐに対して感光
体１の回転方向上流側の部分ａに、オゾンが留まってし
まうことにより窒素酸化物（ＮＯｘ）が発生して、それ
が原因で異常画像になってしまう恐れがある。しかしな
がら、この画像形成装置では前述したように、その部分
に近接させて排風ダクト２４と排風ファン２５とを設け
ているので、回転方向上流側の部分ａの空気を排風ファ
ン２５による吸引力で吸引（吹き出しとしてもよい）し
てしまうので、オゾンが回転方向上流側の部分ａに留ま
るのを防止して良好な画像を得ることができる。Therefore, in this state, the photosensitive member 1
Nitrogen oxide (NOx) is generated due to the ozone remaining in the portion a on the upstream side in the rotation direction of the photoconductor 1 with respect to the pressure contact position Tp where the pressure roller 9 and the charging roller 9 are pressed against each other. There is a risk of becoming an image. However, in this image forming apparatus, as described above, since the air exhaust duct 24 and the air exhaust fan 25 are provided close to that portion, the air in the portion a on the upstream side in the rotation direction is sucked by the air exhaust fan 25. Since suction (or blowing) may be performed by force, ozone can be prevented from remaining in the portion a on the upstream side in the rotation direction, and a good image can be obtained.
【００２２】図２はこの発明による画像形成装置の他の
実施の形態の作像部を示す概略構成図であり、図１と対
応する部分には同一の符号を付してある。この画像形成
装置は、矢示Ｃ方向に回転する感光体１と、帯電ローラ
９と、ローラクリーニング部材２２とを備えており、そ
の帯電ローラ９とローラクリーニング部材２２をケース
３１内に収めると共に、そのケース３１で感光体１の表
面の一部を覆うようにしている。そして、その感光体１
と帯電ローラ９とが略水平方向に配設されて互いに圧接
している。FIG. 2 is a schematic diagram showing an image forming section of another embodiment of the image forming apparatus according to the present invention, and portions corresponding to FIG. 1 are denoted by the same reference numerals. The image forming apparatus includes the photoconductor 1 rotating in the direction of arrow C, the charging roller 9, and a roller cleaning member 22. The charging roller 9 and the roller cleaning member 22 are housed in a case 31. The case 31 covers a part of the surface of the photoconductor 1. And the photoconductor 1
And the charging roller 9 are disposed in a substantially horizontal direction and are in pressure contact with each other.
【００２３】また、ケース３１には、感光体１と帯電ロ
ーラ９とが圧接する圧接位置Ｔｐに対して感光体１の回
転方向上流側（図で上側）で圧接位置Ｔｐの近傍を通っ
た気流をケース３１の外部に流出させる開口３２を設け
ている。なお、図２で３５は、転写ベルトである。The case 31 has an airflow passing near the pressing position Tp on the upstream side (upper side in the drawing) in the rotation direction of the photosensitive member 1 with respect to the pressing position Tp where the photosensitive member 1 and the charging roller 9 are pressed against each other. An opening 32 is provided to allow the fluid to flow out of the case 31. In FIG. 2, reference numeral 35 denotes a transfer belt.
【００２４】このように、帯電ローラ９が感光体１の横
で接するタイプのものでは、その感光体１と帯電ローラ
９とが圧接する圧接位置Ｔｐに対して感光体１の回転方
向上流側に形成されるＶ字部３３に、空気よりも重いオ
ゾンが溜り易いが、この画像形成装置はその圧接位置Ｔ
ｐの近傍を通った気流をケース３１の外部に流出させる
開口３２をケース３１に設けているので、帯電時に発生
したオゾンはその気流に流されてＶ字部３３に溜るよう
なことがない。したがって、帯電時に発生したオゾンが
Ｖ字部３３に溜ることによって異常画像が発生するのを
防止することができる。As described above, in the type in which the charging roller 9 is in contact with the photosensitive member 1 laterally, the photosensitive member 1 and the charging roller 9 are located on the upstream side in the rotational direction of the photosensitive member 1 with respect to the pressing position Tp where the charging roller 9 is pressed. Ozone, which is heavier than air, tends to accumulate in the V-shaped portion 33 to be formed.
Since the case 31 is provided with the opening 32 for allowing the airflow passing through the vicinity of p to flow out of the case 31, the ozone generated during charging does not flow into the airflow and accumulate in the V-shaped portion 33. Therefore, it is possible to prevent the occurrence of an abnormal image due to the accumulation of ozone generated during charging in the V-shaped portion 33.
【００２５】[0025]
【発明の効果】以上説明したように、この発明による画
像形成装置によれば、帯電ローラの回りにオゾンが溜る
ようなことがないので、そのオゾンが原因で異常画像が
発生するのを防止することができる。As described above, according to the image forming apparatus of the present invention, since ozone does not accumulate around the charging roller, an abnormal image is prevented from being generated due to the ozone. be able to.
【図１】この発明の一実施形態例である画像形成装置の
作像部を示す概略構成図である。FIG. 1 is a schematic configuration diagram illustrating an image forming unit of an image forming apparatus according to an embodiment of the present invention.
【図２】この発明による画像形成装置の他の実施の形態
の作像部を示す概略構成図である。FIG. 2 is a schematic configuration diagram showing an image forming unit of another embodiment of the image forming apparatus according to the present invention.
【図３】帯電ローラが感光体の横に接するタイプのもの
ではその感光体と帯電ローラとによって形成されるＶ字
部にオゾンが溜り易い様子を説明するための概略図であ
る。FIG. 3 is a schematic view for explaining how ozone easily accumulates in a V-shaped portion formed by the photoconductor and the charging roller in a type in which the charging roller is in contact with the side of the photoconductor.
１：感光体 ２：帯電装置 ９：帯電ローラ ２２：ローラクリーニング部材 ２４：排風ダクト ２５：排風ファン ３１：ケース ３２：開口 1: photosensitive member 2: charging device 9: charging roller 22: roller cleaning member 24: exhaust duct 25: exhaust fan 31: case 32: opening
Claims (3)
圧接した状態で該感光体を帯電する帯電ローラと、該帯
電ローラの表面に作像中も当接して該帯電ローラの表面
をクリーニングするクリーニング部材とを備えた画像形
成装置において、 前記感光体と前記帯電ローラとが圧接する圧接位置に対
して前記感光体の回転方向上流側に、前記圧接位置の前
記回転方向上流側近傍に気流を発生させる気流発生手段
を設けたことを特徴とする画像形成装置の帯電装置。1. A rotating photoreceptor, a charging roller for charging the photoreceptor while being pressed against the surface of the photoreceptor, and contacting the surface of the charging roller during image formation to form a surface of the charging roller. An image forming apparatus comprising: a cleaning member for cleaning; an upstream side in the rotation direction of the photoconductor relative to a pressing position where the photoconductor and the charging roller are pressed against each other; A charging device for an image forming apparatus, comprising an airflow generating means for generating an airflow.
圧接した状態で該感光体を帯電する帯電ローラと、該帯
電ローラの表面に作像中も当接して該帯電ローラの表面
をクリーニングするクリーニング部材とを備え、前記帯
電ローラと前記クリーニング部材をケース内に収めると
共に、該ケースで前記感光体の表面の一部を覆うように
した画像形成装置において、 前記ケースに、前記感光体と前記帯電ローラとが圧接す
る圧接位置に対して前記感光体の回転方向上流側で前記
圧接位置の近傍を通った気流をケース外部に流出させる
開口を設けたことを特徴とする画像形成装置の帯電装
置。2. A rotating photoreceptor, a charging roller for charging the photoreceptor in pressure contact with the surface of the photoreceptor, and contacting the surface of the charging roller during image formation to form a surface of the charging roller. An image forming apparatus comprising: a cleaning member for cleaning; wherein the charging roller and the cleaning member are housed in a case, and the case covers a part of the surface of the photoconductor. An image forming apparatus, wherein an opening is provided to allow an airflow passing through the vicinity of the pressing position to flow out of the case on the upstream side in the rotation direction of the photoconductor with respect to a pressing position where the charging roller is pressed against the charging roller. Charging device.
方向に配設されて互いに圧接していることを特徴とする
請求項１又は２記載の画像形成装置。3. The image forming apparatus according to claim 1, wherein the photosensitive member and the charging roller are disposed substantially in a horizontal direction and are in pressure contact with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9324836A JPH11161120A (en) | 1997-11-26 | 1997-11-26 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9324836A JPH11161120A (en) | 1997-11-26 | 1997-11-26 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11161120A true JPH11161120A (en) | 1999-06-18 |
Family
ID=18170232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9324836A Pending JPH11161120A (en) | 1997-11-26 | 1997-11-26 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11161120A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008015027A (en) * | 2006-07-03 | 2008-01-24 | Fuji Xerox Co Ltd | Charging device and image forming apparatus |
| US8323862B2 (en) | 2008-07-25 | 2012-12-04 | Canon Kabushiki Kaisha | Electrophotographic photosensitive member and electrophotographic apparatus |
| US8440377B2 (en) | 2009-11-26 | 2013-05-14 | Canon Kabushiki Kaisha | Electrophotographic photosensitive member and electrophotographic apparatus |
| US8445168B2 (en) | 2009-11-26 | 2013-05-21 | Canon Kabushiki Kaisha | Electrophotographic photosensitive member and electrophotographic apparatus |
| US8455163B2 (en) | 2009-11-27 | 2013-06-04 | Canon Kabushiki Kaisha | Electrophotographic photosensitive member and electrophotographic apparatus |
| US8465891B2 (en) | 2009-11-17 | 2013-06-18 | Canon Kabushiki Kaisha | Electrophotographic photosensitive member and electrophotographic apparatus |
| US8507170B2 (en) | 2008-07-25 | 2013-08-13 | Canon Kabushiki Kaisha | Image-forming method and image-forming apparatus |
| US8630558B2 (en) | 2009-11-25 | 2014-01-14 | Canon Kabushiki Kaisha | Electrophotographic apparatus having an electrophotgraphic photosensitive member with an amorphous silicon carbide surface layer |
| US8758971B2 (en) | 2008-12-26 | 2014-06-24 | Canon Kabushiki Kaisha | Image-forming method |
-
1997
- 1997-11-26 JP JP9324836A patent/JPH11161120A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008015027A (en) * | 2006-07-03 | 2008-01-24 | Fuji Xerox Co Ltd | Charging device and image forming apparatus |
| US8323862B2 (en) | 2008-07-25 | 2012-12-04 | Canon Kabushiki Kaisha | Electrophotographic photosensitive member and electrophotographic apparatus |
| US8507170B2 (en) | 2008-07-25 | 2013-08-13 | Canon Kabushiki Kaisha | Image-forming method and image-forming apparatus |
| US8685611B2 (en) | 2008-07-25 | 2014-04-01 | Canon Kabushiki Kaisha | Electrophotographic photosensitive member and electrophotographic apparatus |
| US8758971B2 (en) | 2008-12-26 | 2014-06-24 | Canon Kabushiki Kaisha | Image-forming method |
| US8465891B2 (en) | 2009-11-17 | 2013-06-18 | Canon Kabushiki Kaisha | Electrophotographic photosensitive member and electrophotographic apparatus |
| US8630558B2 (en) | 2009-11-25 | 2014-01-14 | Canon Kabushiki Kaisha | Electrophotographic apparatus having an electrophotgraphic photosensitive member with an amorphous silicon carbide surface layer |
| US8440377B2 (en) | 2009-11-26 | 2013-05-14 | Canon Kabushiki Kaisha | Electrophotographic photosensitive member and electrophotographic apparatus |
| US8445168B2 (en) | 2009-11-26 | 2013-05-21 | Canon Kabushiki Kaisha | Electrophotographic photosensitive member and electrophotographic apparatus |
| US8455163B2 (en) | 2009-11-27 | 2013-06-04 | Canon Kabushiki Kaisha | Electrophotographic photosensitive member and electrophotographic apparatus |
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