JPH07121003A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH07121003A JPH07121003A JP26362093A JP26362093A JPH07121003A JP H07121003 A JPH07121003 A JP H07121003A JP 26362093 A JP26362093 A JP 26362093A JP 26362093 A JP26362093 A JP 26362093A JP H07121003 A JPH07121003 A JP H07121003A
- Authority
- JP
- Japan
- Prior art keywords
- charging
- photoconductor
- roller
- photoreceptor
- charging member
- 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
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、回動するドラム状あ
るいはベルト状の感光体に帯電部材を接触させて帯電す
る接触帯電方式の静電複写機，光プリンタ，ファクシミ
リ等の画像形成装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a contact charging type electrostatic copying machine, an optical printer, a facsimile machine or the like, in which a charging member is contacted with a rotating drum-shaped or belt-shaped photosensitive member to charge it. .
【０００２】[0002]
【従来の技術】例えば、静電複写機，光プリンタ等の画
像形成装置は、被帯電体である感光体を帯電処理する装
置を備えているが、従来はその装置としてコロナ帯電装
置が被帯電体面を均一に帯電することができるというこ
とから広く使用されている。2. Description of the Related Art For example, an image forming apparatus such as an electrostatic copying machine or an optical printer is equipped with a device for charging a photosensitive member, which is a member to be charged. Conventionally, a corona charging device is used as the device. It is widely used because it can uniformly charge the body surface.
【０００３】しかしながら、このコロナ帯電装置の場合
には、コロナ放電に伴ってオゾンや窒素酸化物が発生す
るため、それが人体に対して有害であったり、環境に対
して悪影響を与えたり、さらにはそれらのオゾンや窒素
酸化物が感光体，帯電器，光学系等の各部に付着するこ
とによって画像劣化の原因になりやすいという欠点があ
った。However, in the case of this corona charging device, ozone and nitrogen oxides are generated due to corona discharge, which are harmful to the human body and adversely affect the environment. However, there is a drawback in that the ozone and nitrogen oxides are likely to cause image deterioration by adhering to various parts such as the photoconductor, the charger and the optical system.
【０００４】そこで、上記のような欠点がほとんどない
帯電装置として、電圧を印加したローラ状やベルト状の
帯電部材を被帯電体である感光体に接触させた状態で帯
電する接触帯電方式の帯電装置が注目されている。しか
しながら、このような帯電装置は、帯電部材が感光体と
接触する構成のため、クリーニングユニットによりクリ
ーニングされた後に感光体上に残ったトナーやその他の
紙粉等の異物が帯電ローラや帯電ベルトの表面に筋状に
付着したりして、それが帯電不良を引き起こす原因にな
り易いということがあった。Therefore, as a charging device having almost no such drawbacks as described above, a charging method of a contact charging type in which a roller-shaped or belt-shaped charging member to which a voltage is applied is charged in a state of being brought into contact with a photosensitive member which is a member to be charged. Devices are receiving attention. However, in such a charging device, since the charging member is in contact with the photoconductor, foreign matters such as toner and other paper dust remaining on the photoconductor after being cleaned by the cleaning unit may be transferred to the charging roller or the charging belt. There was a case in which streaks adhered to the surface, which tended to cause poor charging.
【０００５】そのため、このような問題を解決するた
め、上記のような帯電部材（ベルトタイプ）をフェルト
材からなるクリーニング部材でクリーニングするように
したものが、例えば特開平２−３０１７７７号公報に記
載されている。Therefore, in order to solve such a problem, a charging member (belt type) as described above is cleaned with a cleaning member made of a felt material, for example, as disclosed in Japanese Patent Laid-Open No. 2-301777. Has been done.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、このよ
うなフェルト材等からなるクリーニング部材を使用して
帯電部材の感光体と接する面をクリーニングするように
した場合には、そのクリーニング部材のクリーニング面
が荒れてくると、その面によって帯電部材の表面を摺擦
した際に除去しきれなかったトナーが帯電部材の表面に
筋状となって強固に付着し、それが原因で良好な帯電が
できなくなって転写された画像に白すじ（白抜け）等の
画像欠陥が現れて、画像品質を低下させてしまうという
ことがあった。However, when the surface of the charging member contacting the photosensitive member is cleaned using the cleaning member made of such a felt material, the cleaning surface of the cleaning member is When the surface becomes rough, the toner that could not be completely removed by rubbing the surface of the charging member due to the surface adheres firmly to the surface of the charging member in the form of streaks, which prevents good charging. In some cases, image defects such as white streaks (white spots) appear in the transferred image, which deteriorates the image quality.
【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、トナーが感光体や帯電部材に付着しにく
いようにして、安定した帯電ができるようにして転写し
た画像に白すじ等の異常画像が発生しないようにするこ
とを目的とする。The present invention has been made in view of the above problems, and makes it difficult for toner to adhere to a photosensitive member or a charging member and enables stable charging, so that white lines or the like appear on a transferred image. The purpose is to prevent abnormal images from occurring.
【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、上述したような画像形成装置におい
て、感光体と帯電部材との接触部の接線がその接触部を
通る重力方向の垂線となす角度が２０゜以内になるよう
に感光体と帯電部材とを配置したものである。また、上
記画像形成装置において、帯電部材をローラ形状とする
とよい。さらに、その帯電部材をローラ形状とした画像
形成装置において、帯電部材を感光体と異なる周速で回
転させる帯電部材駆動又は制動手段を設けると効果的で
ある。In order to achieve the above object, the present invention provides an image forming apparatus as described above, wherein the tangent line of the contact portion between the photosensitive member and the charging member is in the direction of gravity passing through the contact portion. The photosensitive member and the charging member are arranged such that the angle formed with the perpendicular is within 20 °. In the image forming apparatus, the charging member may have a roller shape. Further, it is effective to provide a charging member driving or braking means for rotating the charging member at a peripheral speed different from that of the photoconductor in the image forming apparatus in which the charging member has a roller shape.
【０００９】[0009]
【作用】このように構成した画像形成装置によれば、感
光体及び帯電部材の表面に付着したトナーや紙粉等の付
着物は、その互いに接触しながら回動する感光体と帯電
部材の周速差によって掻き落されるが、帯電部材の位置
を、感光体との接触部の接線がその接触部を通る重力方
向の垂線となす角度が２０゜以内になる位置に配設して
いるため、その掻き落されて落下するトナーや紙粉等の
付着物は、感光体や帯電部材の表面に殆ど付着しない。According to the image forming apparatus having the above-described structure, the adhering substances such as toner and paper powder adhered to the surfaces of the photoconductor and the charging member are rotated around the photoconductor and the charging member while rotating in contact with each other. Although it is scraped off due to the speed difference, the position of the charging member is arranged so that the angle formed by the tangent line of the contact portion with the photoconductor and the perpendicular line passing through the contact portion in the direction of gravity is within 20 °. The adhered substances such as toner and paper dust that are scraped off and fall hardly adhere to the surfaces of the photoconductor and the charging member.
【００１０】また、帯電部材をローラ形状とすれば、そ
れが感光体と接触する部分が僅かになるため汚れにくく
なる。さらに、帯電部材を感光体と異なる周速で回転さ
せる帯電部材駆動又は制動手段を設ければ、感光体の周
速に対して帯電部材の周速を帯電部材駆動手段により速
めたり、帯電部材制動手段により遅めたりすることによ
って周速差を大きくすることができるので、感光体と帯
電部材の表面に付着した上記付着物を摺擦により除去し
て落下させる除去能力が向上する。Further, if the charging member is in the shape of a roller, the portion in contact with the photosensitive member becomes small, so that the charging member is less likely to become dirty. Further, if a charging member driving or braking means for rotating the charging member at a peripheral speed different from that of the photoconductor is provided, the peripheral speed of the charging member can be accelerated by the charging member drive means relative to the peripheral speed of the photoconductor, or the charging member can be braked. Since the peripheral speed difference can be increased by delaying by the means, the removing ability of removing the adhering matter adhering to the surfaces of the photoconductor and the charging member by sliding and dropping is improved.
【００１１】[0011]
【実施例】以下、この発明の実施例を図面に基づいて具
体的に説明する。図１はこの発明の一実施例を示す画像
形成装置の感光体付近の構成を示す概略図である。この
画像形成装置は、被帯電体であり表面１ａに有機体から
なるＯＰＣ（Ｏrganic Ｐhotocunductor）層を形成した
ドラム状の感光体（像担持体）１を、接触状態で帯電す
る帯電部材でありゴムローラの表面に離型性表面層を形
成した帯電ローラ２を備えた接触帯電方式の画像形成装
置であり、その帯電ローラ２が図１の矢示Ａ方向に所定
の周速度で回転する感光体１に接触しながら連れ回りに
より矢示Ｂの順方向に等速で従動回転し、感光体１の表
面１ａを所定の電位に一様に帯電する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a schematic view showing a structure around a photoconductor of an image forming apparatus showing an embodiment of the present invention. This image forming apparatus is a rubber roller that is a charging member that charges a drum-shaped photosensitive member (image bearing member) 1 in which an OPC (organic photoconductor) layer made of an organic material is formed on a surface 1a in a contact state. 1 is a contact charging type image forming apparatus including a charging roller 2 having a releasable surface layer formed on the surface thereof, and the charging roller 2 rotates at a predetermined peripheral speed in the direction of arrow A in FIG. The surface 1a of the photoconductor 1 is uniformly charged to a predetermined potential by being driven and rotated at a constant speed in the forward direction indicated by the arrow B while being in contact with.
【００１２】その感光体１は、ドラム駆動タイミングベ
ルト及びドラム駆動プーリ（共に図示せず）等を介して
回転駆動するモータによって駆動され、その表面１ａに
は常に帯電ローラ２が、導電性加圧バネ１２の付勢力に
より、例えば接触圧１０〜４０ｇｆ／ｃｍ（略線接触）
で圧接している。The photosensitive member 1 is driven by a motor which is rotationally driven through a drum driving timing belt, a drum driving pulley (neither shown), etc., and a charging roller 2 is always provided on the surface 1a thereof with a conductive pressure. Due to the biasing force of the spring 12, for example, a contact pressure of 10 to 40 gf / cm (substantially linear contact)
It is pressed in.
【００１３】その感光体１の回りには、帯電ローラ２の
他に現像装置６と、転写ローラ７と、クリーニングユニ
ット８がそれぞれ配設されており、露光装置９からの光
が感光体１の表面１ａに入射して、帯電ローラ２によっ
て一様に帯電された帯電面が露光されてそこに静電潜像
が形成され、それが現像装置６の現像スリーブ６ａによ
って供給されるトナーにより現像されてトナー像（可視
像）となる。Around the photoconductor 1, a developing device 6, a transfer roller 7, and a cleaning unit 8 are provided in addition to the charging roller 2, and the light from the exposure device 9 is directed to the photoconductor 1. The charged surface, which is incident on the surface 1a and is uniformly charged by the charging roller 2, is exposed to form an electrostatic latent image on the charged surface, which is developed by the toner supplied by the developing sleeve 6a of the developing device 6. And becomes a toner image (visible image).
【００１４】一方、給紙カセツト（図示せず）内の転写
紙Ｐは、所定のタイミングで回転する給紙ローラにより
１枚ずつ送り出され、それがレジストローラ１３とそれ
に圧接回転する加圧ローラ１４との間で一旦停止されて
タイミング調整された後に、感光体１上のトナー像と一
致する正確なタイミングで転写ローラ７が設けられてい
る転写部に向けて搬送される。On the other hand, the transfer paper P in the paper feed cassette (not shown) is sent out one by one by a paper feed roller which rotates at a predetermined timing, and it is fed one by one to a registration roller 13 and a pressure roller 14 which rotates in pressure contact with it. Then, after being temporarily stopped and the timing is adjusted, the sheet is conveyed toward the transfer portion provided with the transfer roller 7 at an accurate timing that matches the toner image on the photoconductor 1.
【００１５】その転写紙Ｐは、図１で右側の面にトナー
像が転写され、それが感光体１から分離されて図示しな
い定着装置へ搬送され、そこでトナーが定着された後に
装置外部の排紙トレイ等へ排出される。On the transfer paper P, a toner image is transferred to the right side surface in FIG. 1, the toner image is separated from the photoconductor 1 and conveyed to a fixing device (not shown), where the toner is fixed and then discharged outside the device. It is ejected to a paper tray or the like.
【００１６】そして、その転写終了後に感光体１上に残
った残留トナー及び紙粉等の異物は、クリーニングユニ
ット８に設けられているクリーニングブレード８ａ及び
ファーブラシ８ｂにより取り除かれ、その感光体１上に
残った残留電位は図示しない除電ランプにより取り除か
れて、次の帯電ローラ２による帯電に備える。After the transfer, foreign matters such as residual toner and paper dust remaining on the photoconductor 1 are removed by a cleaning blade 8a and a fur brush 8b provided in the cleaning unit 8, and the photoconductor 1 is cleaned. The residual potential remaining on the charging roller 2 is removed by a discharging lamp (not shown) to prepare for the next charging by the charging roller 2.
【００１７】帯電ローラ２は、鉄等からなる導電性芯金
１５の外側に、導電性弾性ローラ部１６を形成したもの
であり、その導電性弾性ローラ部１６は、例えばエピク
ロルヒドリンゴム（ＪＩＳ硬度４５゜）のゴム層の上
に、ルミフロン，シリカ，エピクロルヒドリンを分散，
生膜した離型性表面層を形成したものである。The charging roller 2 has a conductive elastic roller portion 16 formed on the outside of a conductive cored bar 15 made of iron or the like. The conductive elastic roller portion 16 is made of, for example, epichlorohydrin rubber (JIS hardness 45). Lumiflon, silica and epichlorohydrin are dispersed on the rubber layer
The releasable surface layer is formed as a biofilm.
【００１８】そして、その導電性芯金１５の両端が、導
電性軸受１７，１７でそれぞれ回転自在に支持されてい
て、その各軸受１７が導電性加圧バネ１２によって感光
体１方向に付勢されて、その帯電ローラ２の軸線が感光
体１の軸線に平行する状態で感光体１の表面１ａに接す
るようになっている。Both ends of the conductive cored bar 15 are rotatably supported by conductive bearings 17, 17, and each bearing 17 is biased toward the photosensitive member 1 by the conductive pressure spring 12. The charging roller 2 comes into contact with the surface 1a of the photoconductor 1 in a state where the axis of the charging roller 2 is parallel to the axis of the photoconductor 1.
【００１９】その帯電ローラ２の導電性芯金１５には、
直流電源２０から導電性加圧バネ１２及び導電性軸受１
７を介して帯電バイアス電圧が印加されるようになって
おり、それによって感光体１の表面１ａが一様に帯電さ
れる。The conductive core metal 15 of the charging roller 2 is
From the DC power source 20 to the conductive pressure spring 12 and the conductive bearing 1
A charging bias voltage is applied via 7, so that the surface 1a of the photoconductor 1 is uniformly charged.
【００２０】ところで、この実施例では、感光体１と帯
電ローラ２との接触部Ｔｐの接線Ｌが、その接触部Ｔｐ
を通る重力方向の垂線Ｌ1 となす角度θが２０゜以内に
なるように感光体１と帯電ローラ２とを配置している。
このように、帯電ローラ２を感光体１に対して配置する
と、帯電ローラ２の位置は例えば図１に示したように感
光体１の図で右側に位置するようになる。By the way, in this embodiment, the tangent line L of the contact portion Tp between the photosensitive member 1 and the charging roller 2 is the contact portion Tp.
The photoconductor 1 and the charging roller 2 are arranged so that the angle .theta.
Thus, when the charging roller 2 is arranged with respect to the photoconductor 1, the position of the charging roller 2 is located on the right side of the photoconductor 1 in the figure as shown in FIG. 1, for example.
【００２１】したがって、このような電子写真方式によ
る画像形成装置では、前述したように画像形成後に感光
体１の表面１ａ上に残ったトナーはクリーニングユニッ
ト８のクリーニングブレド８ａ及びファーブラシ８ｂに
よってクリーニングされるが、その一部が感光体１上に
残った場合にはそれが帯電ローラ２側に移行してその表
面が汚れることがあるが、その各表面に付着したトナー
等の付着物は、感光体１と帯電ローラ２との接触部Ｔｐ
において僅かに生じる摺擦によって剥離されて図示のよ
うに落下する。Therefore, in such an electrophotographic image forming apparatus, the toner remaining on the surface 1a of the photoreceptor 1 after image formation is cleaned by the cleaning blade 8a and the fur brush 8b of the cleaning unit 8 as described above. However, when a part of the toner remains on the photoconductor 1, it may move to the charging roller 2 side and the surface thereof may be soiled. Contact portion Tp between the body 1 and the charging roller 2
In this case, it is peeled off due to a slight rubbing and falls as shown.
【００２２】その際、帯電ローラ２は上記した位置関係
に配設されているため、その剥離されて落下するトナー
等の付着物は、感光体１や帯電ローラ２のいずれの表面
にも殆ど付着することなしにそのまま落下して、その直
下に取り付けられているトナー粉受１０で回収される。At this time, since the charging roller 2 is arranged in the above-mentioned positional relationship, most of the adhered substances such as toner that are peeled off and dropped are adhered to both surfaces of the photoconductor 1 and the charging roller 2. Without doing so, it falls as it is, and is collected by the toner powder receiver 10 attached immediately below it.
【００２３】このようにして、感光体１上及び帯電ロー
ラ２の表面にそれぞれ付着したトナー等による付着物
は、それらが互いに接触部Ｔｐにおいて摺擦されること
によって剥離されて落下するが、その摺擦は次のように
して行われる。In this way, the adhering substances such as the toner adhering to the surface of the photoconductor 1 and the surface of the charging roller 2 are peeled off and dropped by being rubbed against each other at the contact portion Tp. The rubbing is performed as follows.
【００２４】すなわち、帯電ローラ２は感光体１の表面
１ａに接触して連れ回りにより従動回転することは先に
説明したが、その際に帯電ローラ２の感光体１と接する
導電性弾性ローラ部１６は弾力性を有する材料で形成さ
れているため、その接触部Ｔｐにニップが形成され、感
光体１と帯電ローラ２の回転時にその接触部Ｔｐにおい
て極く僅かではあるが摺擦作用が生じ、それによって一
方あるいは互いの表面に付着したトナー等による付着物
が掻き落されて接線Ｌ方向に飛散する。That is, as described above, the charging roller 2 comes into contact with the surface 1a of the photoconductor 1 and is driven to rotate by rotation, but at that time, the conductive elastic roller portion of the charging roller 2 which comes into contact with the photoconductor 1 is contacted. Since 16 is made of a material having elasticity, a nip is formed at the contact portion Tp thereof, and when the photoconductor 1 and the charging roller 2 rotate, a slight rubbing action occurs at the contact portion Tp. As a result, adhered substances such as toner adhered to the surface of one or the other are scraped off and scattered in the tangential line L direction.
【００２５】そして、その落下する付着物は、この実施
例では帯電部材をローラ形状(帯電ローラ２)にしている
ので、感光体１との接触部Ｔｐの接触面積が僅かである
ため、それが帯電ローラ２に付着しにくいので、その表
面は汚れにくい。In this embodiment, since the charging member has a roller shape (charging roller 2), the contact area of the contact portion Tp with the photoconductor 1 is small. Since it does not easily adhere to the charging roller 2, its surface is not easily soiled.
【００２６】図２は重力方向の垂線に対して図１と逆側
に感光体と帯電ローラとの接触部の接線が２０゜以内に
なるように感光体と帯電ローラとを配置した実施例を示
す概略図であり、図１と対応する部分には同一の符号を
付してある。この実施例では、帯電ローラ２の感光体１
に対する配置を、それらの接線Ｌが接触部Ｔｐを通る重
力方向の垂線Ｌ1 となす角度２０゜が重力方向の垂線Ｌ
1 に対して図１と逆側になるようにしている。FIG. 2 shows an embodiment in which the photosensitive member and the charging roller are arranged so that the tangent to the contact portion between the photosensitive member and the charging roller is within 20 ° on the side opposite to that of FIG. 1 with respect to the vertical line in the direction of gravity. It is a schematic diagram shown, and the same code | symbol is attached | subjected to the part corresponding to FIG. In this embodiment, the photoconductor 1 of the charging roller 2 is
The tangent line L to the vertical line L1 passing through the contact portion Tp in the direction of gravity is 20 °.
It is arranged to be on the opposite side of Fig. 1 with respect to 1.
【００２７】このようにしても、図１の実施例と同様に
感光体１上及び帯電ローラ２の表面から剥離されて落下
するトナー等の付着物を、再びその感光体１及び帯電ロ
ーラ２の各表面に付着させることなしに落下させてトナ
ー粉受１０で回収することができる。Even in this case, as in the embodiment shown in FIG. 1, the adhered substances such as toner that are peeled off from the surface of the photosensitive member 1 and the surface of the charging roller 2 and fall on the photosensitive member 1 and the charging roller 2 again. It can be dropped and collected by the toner powder receiver 10 without being attached to each surface.
【００２８】また、この実施例では、帯電ローラ２を感
光体１と異なる周速で回転させる帯電部材駆動手段であ
る駆動モータ２１を設けている。このようにすれば、帯
電ローラ２を感光体１の周速に係らず独自の周速で回転
させることができるので、感光体１との間で周速差を大
きくすることによって、感光体１と帯電ローラ２の各表
面に付着した上記付着物を摺擦により除去して落下させ
る除去能力を向上させることができる。Further, in this embodiment, a drive motor 21 which is a charging member drive means for rotating the charging roller 2 at a peripheral speed different from that of the photosensitive member 1 is provided. By doing so, the charging roller 2 can be rotated at its own peripheral speed regardless of the peripheral speed of the photoconductor 1. Therefore, by increasing the peripheral speed difference with the photoconductor 1, the photoconductor 1 can be rotated. Further, it is possible to improve the removal capability of removing the above-mentioned adhered matter adhered to each surface of the charging roller 2 by rubbing and dropping it.
【００２９】なお、その周速差は、あまり大きくし過ぎ
ると帯電ローラ２あるいは感光体１の表面を損傷させて
しまうので、帯電ローラ２の周速は感光体１の周速に対
して２倍程度までとするのが好ましい。また、その周速
差は、帯電ローラ２に制動（ブレーキ）力を与えて周速
を遅くする帯電部材制動手段を設けることによって与え
るようにしてもよい。この場合には、帯電ローラ２の周
速は感光体１の周速に対して０.５倍程度までとするの
がよい。If the difference in peripheral speed is too large, the surface of the charging roller 2 or the photosensitive member 1 will be damaged, so the peripheral speed of the charging roller 2 is twice the peripheral speed of the photosensitive member 1. It is preferable to set it to a degree. Further, the peripheral speed difference may be provided by providing charging member braking means for applying a braking force to the charging roller 2 to slow down the peripheral speed. In this case, the peripheral speed of the charging roller 2 is preferably up to about 0.5 times the peripheral speed of the photoconductor 1.
【００３０】[0030]
【発明の効果】以上説明したように、この発明によれ
ば、帯電部材の位置を、そこに接する感光体との間の摺
擦で掻き落したトナー等の付着物が再び付着しにくい位
置としたため、帯電部材の表面に摺擦させてその表面の
汚れを取り除くフェルト材等からなるクリーニング部材
を設ける必要がないので、その面が荒れた際に生じやす
いトナーの帯電部材の表面への固着を防止することがで
き、均一で安定した帯電を長期に渡り行えるため、転写
された画像に白すじ等の異常画像が発生しない良好な画
像品質が得られる。As described above, according to the present invention, the position of the charging member is set to the position where the adhered substances such as toner scraped off by the sliding friction between the charging member and the photosensitive member are unlikely to adhere again. Therefore, it is not necessary to provide a cleaning member made of a felt material or the like for rubbing the surface of the charging member to remove stains on the surface, so that the toner is not likely to adhere to the surface of the charging member when the surface is rough. As a result, uniform and stable charging can be performed for a long period of time, so that good image quality in which an abnormal image such as white lines does not occur in the transferred image can be obtained.
【００３１】また、帯電部材をローラ形状とすれば、感
光体との接触部が僅かになるため帯電部材が汚れにくく
なる。さらに、帯電部材を感光体と異なる周速で回転さ
せる帯電部材駆動又は制動手段を設ければ、感光体の周
速に対して帯電部材の周速を帯電部材駆動手段により速
めたり、帯電部材制動手段により遅めたりすることによ
って周速差を大きくすることができるので、感光体と帯
電部材の表面に付着した上記付着物を摺擦により除去し
て落下させる除去能力が向上する。Further, if the charging member is in the shape of a roller, the contact portion with the photosensitive member becomes small, so that the charging member is less likely to become dirty. Further, if a charging member driving or braking means for rotating the charging member at a peripheral speed different from that of the photoconductor is provided, the peripheral speed of the charging member can be accelerated by the charging member drive means relative to the peripheral speed of the photoconductor, or the charging member can be braked. Since the peripheral speed difference can be increased by delaying by the means, the removing ability of removing the adhering matter adhering to the surfaces of the photoconductor and the charging member by sliding and dropping is improved.
【図１】この発明の一実施例を示す画像形成装置の感光
体付近の構成を示す概略図である。FIG. 1 is a schematic diagram showing a configuration around a photoconductor of an image forming apparatus showing an embodiment of the present invention.
【図２】重力方向の垂線に対して図１と逆側に感光体と
帯電ローラとの接触部の接線が２０゜以内になるように
感光体と帯電ローラとを配置した実施例を示す概略図で
ある。FIG. 2 is a schematic view showing an embodiment in which the photoconductor and the charging roller are arranged such that the tangent line of the contact portion between the photoconductor and the charging roller is within 20 ° on the side opposite to the vertical line in the direction of gravity. It is a figure.
１：感光体 ２：帯電ローラ（帯電部材） １０：トナー粉受 ２１：駆動モータ（帯電部材駆動手段） 1: Photoconductor 2: Charging roller (charging member) 10: Toner powder receiving 21: Drive motor (charging member driving means)
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松本 健太郎 東京都大田区中馬込１丁目３番６号 株式 会社リコー内 (72)発明者 早川 直志 東京都大田区中馬込１丁目３番６号 株式 会社リコー内 (72)発明者 宮下 義明 東京都大田区中馬込１丁目３番６号 株式 会社リコー内 (72)発明者 田渕 健 東京都大田区中馬込１丁目３番６号 株式 会社リコー内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kentaro Matsumoto 1-3-6 Nakamagome, Ota-ku, Tokyo Within Ricoh Co., Ltd. (72) Naoshi Hayakawa 1-3-6 Nakamagome, Ota-ku, Tokyo Shares In Ricoh Company (72) Inventor Yoshiaki Miyashita 1-3-6 Nakamagome, Ota-ku, Tokyo Stock Company Ricoh (72) Inventor Ken Tabuchi 1-3-6 Nakamagome, Tokyo Stock Company Ricoh Company
Claims (3)
それを帯電させる帯電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部材との接触部の接線が該接触部
を通る重力方向の垂線となす角度が２０゜以内になるよ
うに前記感光体と前記帯電部材とを配置したことを特徴
とする画像形成装置。1. An image forming apparatus comprising a rotating photoconductor and a charging member for contacting and charging the photoconductor, wherein a tangent line of a contact portion between the photoconductor and the charging member is the contact. An image forming apparatus characterized in that the photoconductor and the charging member are arranged such that an angle formed with a vertical line passing through the section is within 20 °.
前記帯電部材をローラ形状としたことを特徴とする画像
形成装置。2. The image forming apparatus according to claim 1,
An image forming apparatus, wherein the charging member has a roller shape.
前記帯電部材を前記感光体と異なる周速で回転させる帯
電部材駆動又は制動手段を設けたことを特徴とする画像
形成装置。3. The image forming apparatus according to claim 2,
An image forming apparatus comprising a charging member driving or braking means for rotating the charging member at a peripheral speed different from that of the photoconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26362093A JPH07121003A (en) | 1993-10-21 | 1993-10-21 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26362093A JPH07121003A (en) | 1993-10-21 | 1993-10-21 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07121003A true JPH07121003A (en) | 1995-05-12 |
Family
ID=17392068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26362093A Pending JPH07121003A (en) | 1993-10-21 | 1993-10-21 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07121003A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5629755A (en) * | 1994-09-01 | 1997-05-13 | Ricoh Company, Ltd. | Image forming apparatus |
| KR100455323B1 (en) * | 2001-03-13 | 2004-11-06 | 캐논 가부시끼가이샤 | Charging Device and Image Forming Apparatus |
| KR100624498B1 (en) * | 2001-02-02 | 2006-09-18 | 후지제롯쿠스 가부시끼가이샤 | Charger and image formation apparatus using the charger |
| JP2011158505A (en) * | 2010-01-29 | 2011-08-18 | Kyocera Mita Corp | Image forming apparatus |
| JP2015172728A (en) * | 2014-02-18 | 2015-10-01 | キヤノン株式会社 | Cartridge, process cartridge, and image forming apparatus |
| JP2016038497A (en) * | 2014-08-08 | 2016-03-22 | 富士ゼロックス株式会社 | Image forming apparatus and image forming unit |
| JP2018025736A (en) * | 2015-10-26 | 2018-02-15 | キヤノン株式会社 | Charging member and electrophotographic apparatus |
| US10281838B2 (en) | 2014-02-18 | 2019-05-07 | Canon Kabushiki Kaisha | Developing apparatus having a layer thickness regulating member, cartridge, and image forming apparatus |
-
1993
- 1993-10-21 JP JP26362093A patent/JPH07121003A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5629755A (en) * | 1994-09-01 | 1997-05-13 | Ricoh Company, Ltd. | Image forming apparatus |
| KR100624498B1 (en) * | 2001-02-02 | 2006-09-18 | 후지제롯쿠스 가부시끼가이샤 | Charger and image formation apparatus using the charger |
| KR100455323B1 (en) * | 2001-03-13 | 2004-11-06 | 캐논 가부시끼가이샤 | Charging Device and Image Forming Apparatus |
| JP2011158505A (en) * | 2010-01-29 | 2011-08-18 | Kyocera Mita Corp | Image forming apparatus |
| JP2015172728A (en) * | 2014-02-18 | 2015-10-01 | キヤノン株式会社 | Cartridge, process cartridge, and image forming apparatus |
| US10281838B2 (en) | 2014-02-18 | 2019-05-07 | Canon Kabushiki Kaisha | Developing apparatus having a layer thickness regulating member, cartridge, and image forming apparatus |
| JP2016038497A (en) * | 2014-08-08 | 2016-03-22 | 富士ゼロックス株式会社 | Image forming apparatus and image forming unit |
| JP2018025736A (en) * | 2015-10-26 | 2018-02-15 | キヤノン株式会社 | Charging member and electrophotographic apparatus |
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