JPH07168417A - Electrifier - Google Patents
ElectrifierInfo
- Publication number
- JPH07168417A JPH07168417A JP31674693A JP31674693A JPH07168417A JP H07168417 A JPH07168417 A JP H07168417A JP 31674693 A JP31674693 A JP 31674693A JP 31674693 A JP31674693 A JP 31674693A JP H07168417 A JPH07168417 A JP H07168417A
- Authority
- JP
- Japan
- Prior art keywords
- charging
- roller
- surface layer
- photoconductor
- photoreceptor
- 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
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
- G03G15/0208—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices by contact, friction or induction, e.g. liquid charging apparatus
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Dry Development In Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、画像形成装置の帯電装
置に関し、例えば複写機，ファクシミリ，レ−ザプリン
タ等に利用しうる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging device for an image forming apparatus, and can be used in, for example, a copying machine, a facsimile, a laser printer and the like.
【０００２】[0002]
【従来の技術】従来より、電子写真方式の画像形成装置
において、感光体表面を一様に全面帯電するための帯電
手段として、コロナ放電が広く利用されている。コロナ
放電方式は、感光体をある一定の電圧に、均一に帯電す
る手段としては有効であるが、高圧電源を必要とし、更
に放電に伴いオゾンが発生する。大量のオゾン発生は環
境に悪影響を及ぼすばかりでなく、オゾンによって帯電
部材，感光体などが劣化するという問題を伴う。2. Description of the Related Art Conventionally, in an electrophotographic image forming apparatus, corona discharge has been widely used as a charging means for uniformly charging the entire surface of a photoconductor. The corona discharge method is effective as a means for uniformly charging the photoconductor to a certain voltage, but it requires a high-voltage power source, and ozone is generated with the discharge. Generation of a large amount of ozone not only adversely affects the environment, but also involves the problem that ozone deteriorates the charging member, the photoconductor, and the like.
【０００３】そこで、以下に説明するように、コロナ放
電以外によって感光体を帯電させるようにした、様々な
形式の帯電装置が提案されている。Therefore, as described below, various types of charging devices have been proposed in which the photosensitive member is charged by means other than corona discharge.
【０００４】例えば、芯金の上に弾性導電層（又は弾性
半導電層）を設けた帯電ローラを感光体の表面に圧接さ
せて、その状態で帯電ローラから感光体に電流を流し、
感光体を帯電させる帯電装置が提案されている。しかし
この種の帯電装置の場合、帯電ローラと感光体との同一
部分が長時間接触し続けることによって、その部分の帯
電特性が劣化し易い。そのため、ハ−フト−ンの画像を
形成すると、劣化部分に対応する画像上に、感光体ドラ
ムの円周ピッチで白すじ又は黒すじの画像欠陥が発生す
る。For example, a charging roller provided with an elastic conductive layer (or an elastic semiconductive layer) on a core metal is brought into pressure contact with the surface of the photoconductor, and in that state, an electric current is caused to flow from the charging roller to the photoconductor.
A charging device that charges a photoconductor has been proposed. However, in the case of this type of charging device, if the same portion of the charging roller and the photoconductor is kept in contact with each other for a long time, the charging characteristic of that portion is easily deteriorated. Therefore, when a halftone image is formed, white or black line image defects occur on the image corresponding to the deteriorated portion at the circumferential pitch of the photosensitive drum.
【０００５】この問題を解決するために、例えば特開平
４−１５７４８５号公報の技術では、帯電動作をする時
だけ帯電部材を感光体に圧接し、帯電しない時には帯電
部材を感光体に圧接しない退避位置に移動させるように
している。しかしこの装置では、帯電部材を移動するた
めの複雑な機構を設ける必要があり、制御も複雑になっ
てしまう。In order to solve this problem, for example, in the technique disclosed in Japanese Patent Laid-Open No. 4-157485, the charging member is pressed against the photosensitive member only when the charging operation is performed, and the charging member is not pressed against the photosensitive member when the charging is not performed. I am trying to move it to the position. However, in this apparatus, it is necessary to provide a complicated mechanism for moving the charging member, and control becomes complicated.
【０００６】また、帯電ローラが感光体と接触している
と、感光体上に残ったわずかなトナーでも帯電ローラ側
に移転してしまうので、そのトナーをクリーニングする
ためにクリーニングブレードやクリーニングブラシを帯
電ローラに取り付ける必要が有る。Further, when the charging roller is in contact with the photosensitive member, even a small amount of toner remaining on the photosensitive member is transferred to the charging roller side. Therefore, a cleaning blade or a cleaning brush is used to clean the toner. It must be attached to the charging roller.
【０００７】帯電装置と感光体との接触によって生じる
上記のような問題を解決するために、例えば特開昭６２
−２９６１７４号公報では、体積抵抗が１０6〜１０13
Ωｃｍの高電気抵抗体でなる固体電極と、その一側面に
形成された電圧印加電極からなる帯電装置により、非接
触で帯電することを提案している。しかしながら、この
ような構成では、均一に帯電することは難しかった。特
に、帯電部材や感光体に突起やピンホールが有ると、落
雷が発生して均一な帯電特性が得られない場合が多い。In order to solve the above-mentioned problems caused by the contact between the charging device and the photosensitive member, for example, Japanese Patent Laid-Open No. 62-62160.
In JP-A-296174, the volume resistance is 10 6 to 10 13
It has been proposed to perform non-contact charging by a charging device including a solid electrode made of a high electric resistance of Ωcm and a voltage applying electrode formed on one side surface thereof. However, with such a configuration, it was difficult to uniformly charge. In particular, if there are projections or pinholes on the charging member or the photoreceptor, lightning strikes often occur and uniform charging characteristics cannot be obtained.
【０００８】また、帯電ローラの表面特性を中抵抗にす
るために、高抵抗塗料に、導電性粉体を分散したり、導
電性塗料を混合分散して構成した表面層材料を用いるこ
とが実施されているが、分散や混合状態の影響により、
ハーフトーン画像を形成すると、分散むらや混合むらの
模様がそのまま画像上に濃度むらとなって現われる傾向
があり、均一な濃度が得られなかった。Further, in order to make the surface characteristics of the charging roller medium resistance, it is preferable to use a surface layer material composed of a high resistance paint in which conductive powder is dispersed or a conductive paint is mixed and dispersed. However, due to the influence of dispersion and mixed state,
When a halftone image is formed, a pattern of uneven dispersion or uneven mixing tends to appear as uneven density on the image as it is, and uniform density cannot be obtained.
【０００９】帯電の均一性を改善するために、特開昭６
３−１４９６６８号公報の「接触帯電方法」では、直流
電圧印加時の帯電開始電圧の２倍以上のピーク間電圧を
もつ交流電圧を重畳させることにより、帯電の均一性を
改善することを提案している。しかしこの方法では、高
圧の交流電圧を重畳させるため、ＤＣ電源とは別にＡＣ
電源が必要となり、装置自体のコストアップを招来す
る。更に、ＡＣ電流を多量に消費するため、多量のオゾ
ンが発生し、その結果、帯電部材や感光体の劣化を招
く。In order to improve the uniformity of charging, Japanese Patent Application Laid-Open No. Sho 6-96
In the "contact charging method" of JP-A-3-149668, it is proposed to improve the uniformity of charging by superimposing an AC voltage having a peak-to-peak voltage that is at least twice the charging start voltage when a DC voltage is applied. ing. However, in this method, since a high-voltage AC voltage is superimposed, an AC power source is provided separately from the DC power source.
A power source is required, which increases the cost of the device itself. Furthermore, since a large amount of AC current is consumed, a large amount of ozone is generated, resulting in deterioration of the charging member and the photoconductor.
【００１０】[0010]
【発明が解決しようとする課題】従って本発明は、上述
のような様々な問題を解消するとともに、感光体の均一
な帯電を実現することを課題とする。SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to solve the above-mentioned various problems and to realize uniform charging of a photoconductor.
【００１１】[0011]
【課題を解決するための手段】上記課題を解決するため
に、本発明では、被帯電体（１）を帯電させる帯電装置
において：少なくともその表面部分が電気絶縁性の材料
で構成され、回動自在に支持された、ロ−ラ状の帯電部
材（２）；該帯電部材を、前記被帯電体と非接触な状態
で支持し、両者の間隙を一定に保持する、間隙保持部材
（４）；少なくともその表面部分が導電性の材料で構成
され、該表面部分が前記帯電部材の表面に当接した状態
で回動自在に支持された、ロ−ラ状の電極部材（３）；
及び前記帯電部材及び電極部材に回転力を与える、動力
伝達手段（４）；を設け、前記電極部材への電圧印加に
より、前記帯電部材を介して、前記被帯電体の帯電を実
施する。In order to solve the above problems, according to the present invention, in a charging device for charging a body (1) to be charged, at least a surface portion thereof is made of an electrically insulating material and is rotated. A roller-shaped charging member (2) that is freely supported; a gap holding member (4) that supports the charging member in a non-contact state with the member to be charged and holds the gap between the two members constant. A roller-shaped electrode member (3), at least the surface portion of which is made of a conductive material, and which is rotatably supported while the surface portion is in contact with the surface of the charging member.
And a power transmission means (4) for applying a rotational force to the charging member and the electrode member, and by applying a voltage to the electrode member, the charged body is charged through the charging member.
【００１２】また請求項２では、前記被帯電体と前記帯
電部材との間隙を、３〜１０００μｍの範囲内に設定す
る。In the second aspect, the gap between the member to be charged and the charging member is set within the range of 3 to 1000 μm.
【００１３】なお上記括弧内に示した記号は、後述する
実施例中の対応する要素の符号を参考までに示したもの
であるが、本発明の各構成要素は実施例中の具体的な要
素のみに限定されるものではない。The symbols shown in parentheses are the reference numerals of corresponding elements in the embodiments described later, but each constituent element of the present invention is a concrete element in the embodiments. It is not limited to only.
【００１４】[0014]
【作用】本発明では、ロ−ラ状の帯電部材（２）とロ−
ラ状の電極部材（３）とが常時接触しており、電極部材
（３）に高電圧（コロナ放電よりははるかに低い）を印
加することにより、電極部材（３）の表面からその電位
が帯電部材（２）の表面に転写される。この時、電極部
材（３）表面上では、その突起やピンホールによって、
電圧分布に不均一が生じる可能性があるが、帯電部材
（２）に転写される時に、帯電部材（２）の特性によ
り、帯電部材（２）の表面上での電圧分布は、ほぼ均一
になる。また、動力伝達手段（４）によって帯電部材及
び電極部材が回転するので、帯電部材（２）の全周面が
均一に帯電する。この帯電部材（２）は、間隙保持部材
（４）によって感光体と非接触で近接する位置に配置さ
れているので、帯電部材（２）の帯電電位によって、帯
電部材（２）と感光体との間隙の間で放電が生じ、感光
体が帯電する。In the present invention, the roller-shaped charging member (2) and roller
When the electrode member (3) is constantly in contact with the electrode member (3) and a high voltage (much lower than corona discharge) is applied to the electrode member (3), its potential is changed from the surface of the electrode member (3). It is transferred to the surface of the charging member (2). At this time, on the surface of the electrode member (3), due to the protrusions and pinholes,
The voltage distribution may be non-uniform, but when transferred to the charging member (2), the voltage distribution on the surface of the charging member (2) becomes substantially uniform due to the characteristics of the charging member (2). Become. Further, since the charging member and the electrode member are rotated by the power transmission means (4), the entire peripheral surface of the charging member (2) is uniformly charged. Since the charging member (2) is arranged in a position that is in non-contact with and close to the photoconductor by the gap holding member (4), the charging member (2) and the photoconductor are separated by the charging potential of the charging member (2). Discharge occurs between the gaps, and the photoreceptor is charged.
【００１５】従って、感光体の均一な帯電が実現でき、
しかも感光体と帯電部材（２）とが非接触であるため、
帯電部材（２）をクリ−ニングする必要もなく、更に接
触による帯電特性の劣化を防止しうる。Therefore, uniform charging of the photosensitive member can be realized,
Moreover, since the photoconductor and the charging member (2) are not in contact with each other,
It is not necessary to clean the charging member (2), and it is possible to prevent deterioration of the charging characteristics due to contact.
【００１６】[0016]
【実施例】本発明を実施する帯電装置の主要部の構成を
図１に示す。図１を参照して説明する。感光体１は、ド
ラム状に形成されており、複写機やレ−ザプリンタにお
いて画像を形成するために利用される。即ち、感光体１
の表面を均一に所定の高電位に帯電させた後、記録すべ
き画像に対応する光を感光体１に照射することにより、
感光体１上に画像に対応する電位分布、即ち静電潜像が
形成される。この静電潜像を所定の現像器に通すと、電
位分布に応じて感光体上に現像器内のトナ−が付着し、
トナ−の可視像が形成される。このトナ−像を所定の転
写紙に転写することにより、転写紙上に画像を記録する
ことができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the structure of the main part of a charging device embodying the present invention. This will be described with reference to FIG. The photoconductor 1 is formed in a drum shape and is used for forming an image in a copying machine or a laser printer. That is, the photoconductor 1
After uniformly charging the surface of the sheet to a predetermined high potential, the photoreceptor 1 is irradiated with light corresponding to the image to be recorded,
A potential distribution corresponding to an image, that is, an electrostatic latent image is formed on the photoconductor 1. When this electrostatic latent image is passed through a predetermined developing device, the toner in the developing device adheres to the photosensitive member according to the potential distribution,
A visible image of the toner is formed. By transferring this toner image onto a predetermined transfer paper, an image can be recorded on the transfer paper.
【００１７】図１に示すように、感光体１の表面と近接
して帯電ローラ２が配置されており、更に帯電ローラ２
の表面と接する位置に給電ローラ３が配置されている。
帯電ローラ２は、図２に示すように、金属製の芯金２１
と、その表面に形成した電気絶縁性の表面層２２とで構
成されている。また帯電ローラ２は、芯金２１の両端部
２１ａ及び２１ｂにそれぞれ装着したスペーサ４と一体
に構成してある。更に帯電ローラ２は、図示しない軸受
けによって装置のフレ−ムに回動自在に支持されてお
り、この軸受けによって、帯電ロ−ラ２は、図１に示す
ようにスペーサ４が感光体１の表面と常時当接するよう
に位置決めされている。As shown in FIG. 1, a charging roller 2 is arranged close to the surface of the photosensitive member 1, and the charging roller 2 is further provided.
The power feeding roller 3 is arranged at a position in contact with the surface of the.
As shown in FIG. 2, the charging roller 2 includes a metal core bar 21.
And an electrically insulating surface layer 22 formed on the surface thereof. Further, the charging roller 2 is formed integrally with the spacers 4 attached to both ends 21a and 21b of the cored bar 21, respectively. Further, the charging roller 2 is rotatably supported by a frame of the apparatus by a bearing (not shown). With this bearing, the charging roller 2 has a spacer 4 on the surface of the photoconductor 1 as shown in FIG. It is positioned so as to always come into contact with.
【００１８】スペーサ４の直径は、帯電ローラ２の直径
よりも僅かに大きくなっているので、帯電ローラ２と感
光体１とは非接触になっており、両者の間隙はスペーサ
４により一定に保持されている。また、この間隙を一定
にするため、芯金２１の円周表面は、精度良く仕上げて
ある。帯電ローラ２の表面と感光体１の表面とは非接触
であるが、スペーサ４が感光体１の表面に接しているの
で、スペーサ４と感光体１との接触部分の摩擦によっ
て、両者は係合している。即ち、感光体１が回転駆動さ
れると、それに伴なってスペーサ４がつれ廻り駆動さ
れ、スペーサ４と一体になった帯電ローラ２が回転す
る。Since the diameter of the spacer 4 is slightly larger than the diameter of the charging roller 2, the charging roller 2 and the photoconductor 1 are not in contact with each other, and the gap between them is kept constant by the spacer 4. Has been done. Further, in order to make this gap constant, the circumferential surface of the cored bar 21 is finished with high accuracy. Although the surface of the charging roller 2 and the surface of the photoconductor 1 are not in contact with each other, since the spacer 4 is in contact with the surface of the photoconductor 1, the spacer 4 and the photoconductor 1 contact with each other due to friction between them. I am fit. That is, when the photoconductor 1 is rotationally driven, the spacer 4 is driven around along with it, and the charging roller 2 integrated with the spacer 4 is rotated.
【００１９】なお図２では帯電ローラ２の表面層２２が
一層となっているが、二層以上の多層構造も可能であ
る。又樹脂で帯電ローラ２を構成する場合には、表面層
２２はなくてもよい。Although the surface layer 22 of the charging roller 2 is a single layer in FIG. 2, a multilayer structure of two or more layers is also possible. When the charging roller 2 is made of resin, the surface layer 22 may be omitted.
【００２０】一方、給電ローラ３は、図３に示すように
構成してある。即ち、金属製の芯金３１の円周上に弾性
材料を巻いて弾性層３２を形成してあり、さらにその上
に表面層３３が塗装してある。弾性層３２は、帯電ロー
ラ２との接触部分の面積を増やすために設けてある。表
面層３３は、導電性を有する材料で形成してあり、表面
層膜として充分な耐久性能と寿命を有している。On the other hand, the power feeding roller 3 is constructed as shown in FIG. That is, an elastic material is wound on the circumference of a metal cored bar 31 to form an elastic layer 32, and a surface layer 33 is coated on the elastic layer 32. The elastic layer 32 is provided to increase the area of the contact portion with the charging roller 2. The surface layer 33 is formed of a conductive material and has sufficient durability and life as a surface layer film.
【００２１】この給電ローラ３は、芯金３１の両端３１
ａ及び３１ｂが図示しない軸受けによって回動自在に支
持されており、また表面層３３が常時帯電ローラ２の表
面層２２と接触するように位置決めされている。そのた
め、給電ローラ３と帯電ローラ２はそれらの接触部分の
摩擦によって常時係合しており、帯電ローラ２が回転す
ると、それに伴なって給電ローラ３がつれ廻る。This power feeding roller 3 has both ends 31 of a cored bar 31.
A and 31b are rotatably supported by bearings (not shown), and the surface layer 33 is positioned so as to always contact the surface layer 22 of the charging roller 2. Therefore, the power feeding roller 3 and the charging roller 2 are always engaged by the friction of their contact portions, and when the charging roller 2 rotates, the power feeding roller 3 rotates around accordingly.
【００２２】給電ローラの芯金３１には、所定の給電端
子と接続されたの電極接点（図示せず）が接触してお
り、この給電端子には、感光体１を帯電させる時に、図
示しない直流電源から電圧が印加される。An electrode contact (not shown) connected to a predetermined power supply terminal is in contact with the core metal 31 of the power supply roller, and this power supply terminal is not shown when the photoconductor 1 is charged. A voltage is applied from a DC power supply.
【００２３】給電ローラ３の給電端子から芯金３１に高
電圧を印加すると、給電ローラ３の表面層３３はこの高
電圧と等電圧になる。この給電ローラ３の表面層３３に
は、帯電ローラ２の表面層２２が接触しているので、前
者の表面に電圧が現われると、その電圧が帯電ローラ２
の表面層２２に転写される。When a high voltage is applied to the cored bar 31 from the power supply terminal of the power supply roller 3, the surface layer 33 of the power supply roller 3 becomes equal in voltage to this high voltage. Since the surface layer 22 of the charging roller 2 is in contact with the surface layer 33 of the power feeding roller 3, when a voltage appears on the surface of the former, the voltage is applied to the charging roller 2.
Is transferred to the surface layer 22 of.
【００２４】この時、給電ローラ３の表面層３３上で
は、そこに形成された突起やピンホールによって、電圧
分布の不均一が生じる場合が多い。しかしその電圧分布
は、帯電ローラ２の表面層２２上に転写されると、帯電
ローラ２の特性により変化し、表面層２２上での電圧分
布は、ほぼ均一になることが確認されている。At this time, on the surface layer 33 of the power feeding roller 3, unevenness in the voltage distribution often occurs due to the projections and pinholes formed therein. However, it has been confirmed that, when the voltage distribution is transferred onto the surface layer 22 of the charging roller 2, it changes depending on the characteristics of the charging roller 2, and the voltage distribution on the surface layer 22 becomes substantially uniform.
【００２５】また、感光体１の帯電を実施する時には、
感光体１が回転駆動されるので、その駆動力がスペーサ
４を介して帯電ローラ２に伝達され、帯電ローラ２も回
転する。更に、帯電ローラ２が回転すると、それに伴な
って給電ローラ３が従動回転する。従って、帯電ローラ
２は、その表面層２２の周面全体に渡って、均一な電圧
分布で帯電する。When charging the photoconductor 1,
Since the photoconductor 1 is rotationally driven, its driving force is transmitted to the charging roller 2 via the spacer 4, and the charging roller 2 also rotates. Further, when the charging roller 2 rotates, the power feeding roller 3 is driven to rotate accordingly. Therefore, the charging roller 2 is charged with a uniform voltage distribution over the entire peripheral surface of the surface layer 22.
【００２６】感光体１の表面と帯電ローラ２の表面との
間隙は、スペーサ４によって、３〜１０００μｍに保た
れているので、帯電ローラ２の表面層２２が高電位に帯
電すると、表面層２２と感光体１の表面層１１（感光
層）との微小間隙の間で放電が生じ、感光体１が帯電す
る。Since the gap between the surface of the photosensitive member 1 and the surface of the charging roller 2 is kept at 3 to 1000 μm by the spacer 4, when the surface layer 22 of the charging roller 2 is charged to a high potential, the surface layer 22. A discharge is generated in a minute gap between the surface layer 11 of the photoconductor 1 (photosensitive layer) and the photoconductor 1 is charged.
【００２７】従来との違い、ならびに帯電ローラ２及び
給電ローラ３の構成の変更による特性の違いを調べるた
めに、次に説明する様々な実施例と１つの比較例につい
て、その特性を測定する実験を実施した。Experiments for measuring the characteristics of various examples and one comparative example, which will be described below, in order to investigate the difference between the conventional example and the characteristic due to the change in the configuration of the charging roller 2 and the power feeding roller 3 Was carried out.
【００２８】［実施例１の構成］ 帯電ローラ 芯金２１ ： ＳＵＳ３０３ 表面層２２： 旭ガラス（株）製のフッ素樹脂ルミフロ
ンＬＦ１００，硬化剤としてブロックイソシアネ−ト 給電ローラ 芯金３１ ： ＳＵＳ３０３ 弾性層３２： ダイソ−（株）製のエピクロルヒドリン
ゴム （商品名：エピクロマ−） 配合（重合体１００につき）： ステアリン酸スズ １ 活性マグネシア ５ ＮＡ−２２ 1.5 老化防止ＮＢＣ ２ 円筒フィルム状に押し出し、金属ロ−ラを差し込んだと
ころで巻き蒸し加硫した。[Structure of Example 1] Charging roller core metal 21: SUS303 Surface layer 22: Fluororesin Lumiflon LF100 manufactured by Asahi Glass Co., Ltd., block isocyanate as a curing agent Power supply roller core metal 31: SUS303 elastic layer 32: Epichlorohydrin rubber (trade name: epichroma) manufactured by Daiso Co., Ltd. (composition per 100 polymers): Tin stearate 1 Active magnesia 5 NA-22 1.5 Anti-aging NBC 2 Extruded into a cylindrical film shape, a metal roll. When la was inserted, it was rolled, steamed and vulcanized.
【００２９】その後で、給電ロ−ラ表面に研磨加工を施
した。After that, the surface of the power feeding roller was polished.
【００３０】表面層３３： ルミフロンとエピクロマ−
を１：１に混合した材料をスプレ−塗装した。膜厚は５
μｍ。Surface layer 33: Lumiflon and epichroma
1: 1 mixed material was spray-painted. Film thickness is 5
μm.
【００３１】［実施例２の構成］ 帯電ローラ 芯金２１ ： ＳＵＳ３０３ 表面層２２： 旭ガラス（株）製のフッ素樹脂ルミフロ
ンＬＦ１００，硬化剤としてブロックイソシアネ−ト 給電ローラ 芯金３１ ： ＳＵＳ３０３ 弾性層３２： ダイソ−（株）製のエピクロルヒドリン
ゴム （商品名：エピクロマ−） 配合（重合体１００につき）： ステアリン酸スズ １ 活性マグネシア ５ ＮＡ−２２ 1.5 老化防止ＮＢＣ ２ 円筒フィルム状に押し出し、金属ロ−ラを差し込んだと
ころで巻き蒸し加硫した。[Structure of Embodiment 2] Charging roller core metal 21: SUS303 Surface layer 22: Fluororesin Lumiflon LF100 manufactured by Asahi Glass Co., Ltd., block isocyanate as a curing agent Power supply roller core metal 31: SUS303 elastic layer 32: Epichlorohydrin rubber (trade name: epichroma) manufactured by Daiso Co., Ltd. (composition per 100 polymers): Tin stearate 1 Active magnesia 5 NA-22 1.5 Anti-aging NBC 2 Extruded into a cylindrical film shape, a metal roll. When la was inserted, it was rolled, steamed and vulcanized.
【００３２】その後で、給電ロ−ラ表面に研磨加工を施
した。After that, the surface of the power supply roller was polished.
【００３３】表面層３３：なし ［実施例３の構成］ 帯電ローラ 芯金２１ ： Ａ５０５２ 表面層２２： 東レダウコ−ニングシリコ−ン（株）製
のＳＲ２４１０ 給電ローラ 芯金３１ ： ＳＵＳ３０３ 弾性層３２： ダイソ−（株）製のエピクロルヒドリン
ゴム （商品名：エピクロマ−） 配合（重合体１００につき）： ステアリン酸スズ １ 活性マグネシア ５ ＮＡ−２２ 1.5 老化防止ＮＢＣ ２ 円筒フィルム状に押し出し、金属ロ−ラを差し込んだと
ころで巻き蒸し加硫した。Surface layer 33: None [Structure of Example 3] Charging roller core metal 21: A5052 Surface layer 22: SR2410 power supply roller core metal 31 manufactured by Toray Dow Corning Silicone Co., Ltd. SUS303 Elastic layer 32: Diso -Epichlorohydrin rubber (trade name: Epichroma) manufactured by Co., Ltd. (per 100 polymer): Tin stearate 1 Active magnesia 5 NA-22 1.5 Anti-aging NBC 2 Extruded into a cylindrical film and inserted with a metal roller. Then, it was rolled and steamed and vulcanized.
【００３４】その後で、給電ロ−ラ表面に研磨加工を施
した。After that, the surface of the power feeding roller was polished.
【００３５】表面層３３： ルミフロンとエピクロマ−
を１：１に混合した材料をスプレ−塗装した。膜厚は５
μｍ。Surface layer 33: Lumiflon and epichroma
1: 1 mixed material was spray-painted. Film thickness is 5
μm.
【００３６】［実施例４の構成］ 帯電ローラ 芯金２１ ： Ａ５０５２ 表面層２２： 東レダウコ−ニングシリコ−ン（株）製
のＳＲ２４１０ 給電ローラ 芯金３１ ： ＳＵＳ３０３ 弾性層３２： ダイソ−（株）製のエピクロルヒドリン
ゴム （商品名：エピクロマ−） 配合（重合体１００につき）： ステアリン酸スズ １ 活性マグネシア ５ ＮＡ−２２ 1.5 老化防止ＮＢＣ ２ 円筒フィルム状に押し出し、金属ロ−ラを差し込んだと
ころで巻き蒸し加硫した。[Structure of Example 4] Charging roller core metal 21: A5052 surface layer 22: SR2410 power supply roller core metal 31 manufactured by Toray Dow Corning Silicone Co., Ltd. SUS303 elastic layer 32: manufactured by Daiso Co., Ltd. Epichlorohydrin rubber (trade name: epichroma) Compounding (per 100 polymer): Tin stearate 1 Active magnesia 5 NA-22 1.5 Anti-aging NBC 2 Cylindrical film extruded and steamed with a metal roller inserted. Vulcanized
【００３７】その後で、給電ロ−ラ表面に研磨加工を施
した。After that, the surface of the power supply roller was polished.
【００３８】表面層３３：なし ［実施例５の構成］ 帯電ローラ 全体を高密度ポリエチレンで形成した。Surface layer 33: None [Structure of Example 5] The entire charging roller was made of high-density polyethylene.
【００３９】給電ローラ 芯金３１ ： ＳＵＳ３０３ 弾性層３２： ダイソ−（株）製のエピクロルヒドリン
ゴム （商品名：エピクロマ−） 配合（重合体１００につき）： ステアリン酸スズ １ 活性マグネシア ５ ＮＡ−２２ 1.5 老化防止ＮＢＣ ２ 円筒フィルム状に押し出し、金属ロ−ラを差し込んだと
ころで巻き蒸し加硫した。Power supply roller Core metal 31: SUS303 Elastic layer 32: Epichlorohydrin rubber (trade name: epichroma) manufactured by Daiso Co., Ltd. Compounding (per 100 polymer): Tin stearate 1 Active magnesia 5 NA-22 1.5 Aging Preventing NBC 2 A film was extruded into a cylindrical film, wound with a metal roller, and then steamed and vulcanized.
【００４０】その後で、給電ロ−ラ表面に研磨加工を施
した。After that, the surface of the power supply roller was polished.
【００４１】表面層３３：なし ［比較例の構成］帯電ロ−ラ２Ｂを図４に示すように、
感光体に近接配置し、帯電ロ−ラ２Ｂに直接電圧を印加
した。給電ロ−ラは設けない。帯電ロ−ラ２Ｂは芯金２
１Ｂ，弾性層３２Ｂ及び表面層２２Ｂで構成した。Surface layer 33: None [Structure of Comparative Example] The charging roller 2B is shown in FIG.
It was placed close to the photoconductor and a voltage was directly applied to the charging roller 2B. No power supply roller is provided. Charging roller 2B is core metal 2
1B, elastic layer 32B and surface layer 22B.
【００４２】芯金２１Ｂ ：ＳＵＳ３０３ 弾性層３２Ｂ：エピクロマ− 表面層２２Ｂ：ルミフロンとエピクロマ−を１：１に混
合した材料をスプレ−塗装した。膜厚は５μｍ。Core bar 21B: SUS303 Elastic layer 32B: Epichroma Surface layer 22B: A material in which Lumiflon and epichroma were mixed in a ratio of 1: 1 was spray-coated. The film thickness is 5 μm.
【００４３】実験の結果を次の表１に示す。The results of the experiment are shown in Table 1 below.
【００４４】[0044]
【表１】 [Table 1]
【００４５】上記表１の結果を参照すると、実施例１〜
５のいずれも、帯電の均一性に関して顕著な有効性が認
められる。また、給電ローラに表面層が存在しない実施
例２，実施例４，及び実施例５では、帯電ローラのクリ
ーニングの必要性がやや認められるので、クリーニング
ブレードやクリーニングパッドを帯電ローラ２の近傍に
設けてそれのクリ−ニングを実施するのが望ましい。Referring to the results in Table 1 above, Examples 1 to 1
In all cases of 5, the remarkable effectiveness is recognized with respect to the uniformity of charging. Further, in Examples 2, 4 and 5 in which the surface layer does not exist on the power feeding roller, the necessity of cleaning the charging roller is recognized to some extent. Therefore, a cleaning blade or a cleaning pad is provided near the charging roller 2. It is desirable to clean it.
【００４６】なお、上記実施例においては、画像形成装
置の帯電プロセスで使用される帯電装置について説明し
たが、画像形成装置の転写プロセスで使用される転写装
置もそれと基本的に同じ帯電機能を果たすものであるの
で、本発明は転写装置で実施することもできる。Although the charging device used in the charging process of the image forming apparatus has been described in the above embodiment, the transfer device used in the transferring process of the image forming apparatus basically performs the same charging function. As such, the present invention can also be implemented in a transfer device.
【００４７】なお、感光体１と帯電ローラ２のギャップ
を３〜１０００μｍの範囲外に設定した実験では、良好
な帯電性能が得られなかった。In an experiment in which the gap between the photoconductor 1 and the charging roller 2 was set outside the range of 3 to 1000 μm, good charging performance could not be obtained.
【００４８】[0048]
【発明の効果】以上のとおり、本発明によれば、帯電ロ
ーラ２が感光体１と接触していないので、圧接の影響に
より帯電性能が劣化するのを防止でき、感光体１の回転
周期の白スジ又は黒スジの画像欠陥が発生しない。ま
た、帯電ローラ２が感光体１と接触していないので、感
光体上に残ったトナーが帯電ローラ側に移転しにくく
（特に表面層を設ける場合に）、良好な帯電性能を長期
間維持しうる。As described above, according to the present invention, since the charging roller 2 is not in contact with the photoconductor 1, it is possible to prevent the charging performance from deteriorating due to the influence of the pressure contact, and the rotation cycle of the photoconductor 1 can be prevented. Image defects such as white lines or black lines do not occur. Further, since the charging roller 2 is not in contact with the photoconductor 1, the toner remaining on the photoconductor is difficult to transfer to the charging roller side (especially when the surface layer is provided), and the good charging performance is maintained for a long time. sell.
【００４９】本発明では、給電ローラにより帯電ローラ
を帯電させているが、このプロセスにおいて給電ローラ
上の不均一な帯電が均一化されるため、均一な帯電特性
が得られる。高抵抗塗料に導電性粉体を分散したり、導
電性塗料を混合分散して、中抵抗を得ている従来の帯電
ローラでは分散や混合のむらによって帯電むらが発生す
るが、本発明では非接触であるため、帯電むらは発生し
ない。また、間接帯電であるため、落雷が落ちなくな
り、この異常画像の発生がなくなった。In the present invention, the charging roller is charged by the power feeding roller. However, in this process, uneven charging on the power feeding roller is made uniform, so that uniform charging characteristics can be obtained. In the conventional charging roller in which the conductive powder is dispersed in the high-resistance paint or the conductive paint is mixed and dispersed to obtain medium resistance, uneven charging occurs due to uneven distribution or mixing, but in the present invention, non-contact Therefore, uneven charging does not occur. In addition, since it is indirectly charged, lightning strikes no longer occur and the occurrence of this abnormal image disappears.
【００５０】また、請求項２のように感光体と帯電ロー
ラのギャップを３〜１０００μｍに設定することで、好
ましい帯電特性が得られる。Further, by setting the gap between the photoconductor and the charging roller to 3 to 1000 μm as in the second aspect, preferable charging characteristics can be obtained.
【図１】 実施例の帯電装置の構成を示し、（ａ）は正
面図、（ｂ）は側面図である。1A and 1B show a configuration of a charging device of an embodiment, FIG. 1A is a front view and FIG. 1B is a side view.
【図２】 図１の帯電ロ−ラ２の構成を示す正面図であ
る。FIG. 2 is a front view showing the configuration of the charging roller 2 of FIG.
【図３】 図１の給電ロ−ラ３の構成を示す正面図であ
る。3 is a front view showing the configuration of a power feeding roller 3 of FIG. 1. FIG.
【図４】 比較例の帯電装置の構成を示す正面図であ
る。FIG. 4 is a front view showing a configuration of a charging device of a comparative example.
１：感光体 ２：帯電ローラ ２１：芯金 ２２：表面層 ３：給電ローラ ３１：芯金 ３２：弾性層 ３３：表面層 ４：スペーサ 1: Photoconductor 2: Charging roller 21: Core metal 22: Surface layer 3: Power feeding roller 31: Core metal 32: Elastic layer 33: Surface layer 4: Spacer
Claims (2)
て：少なくともその表面部分が電気絶縁性の材料で構成
され、回動自在に支持された、ロ−ラ状の帯電部材；該
帯電部材を、前記被帯電体と非接触な状態で支持し、両
者の間隙を一定に保持する、間隙保持部材；少なくとも
その表面部分が導電性の材料で構成され、該表面部分が
前記帯電部材の表面に当接した状態で回動自在に支持さ
れた、ロ−ラ状の電極部材；及び前記帯電部材及び電極
部材に回転力を与える、動力伝達手段；を設け、前記電
極部材への電圧印加により、前記帯電部材を介して、前
記被帯電体の帯電を実施する、ことを特徴とする帯電装
置。1. A charging device for charging an object to be charged: a roller-shaped charging member, at least a surface portion of which is made of an electrically insulating material and is rotatably supported; A gap holding member that supports the member to be charged in a non-contact state and holds a gap between both members constant; at least a surface portion of the member is made of a conductive material, and the surface portion contacts the surface of the charging member. A roller-shaped electrode member that is rotatably supported in a contact state; and a power transmission unit that applies a rotational force to the charging member and the electrode member; are provided by applying a voltage to the electrode member. A charging device, characterized in that the charging target is charged via a charging member.
を、３〜１０００μｍの範囲内に設定した、前記請求項
１記載の帯電装置。2. The charging device according to claim 1, wherein a gap between the member to be charged and the charging member is set within a range of 3 to 1000 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31674693A JPH07168417A (en) | 1993-12-16 | 1993-12-16 | Electrifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31674693A JPH07168417A (en) | 1993-12-16 | 1993-12-16 | Electrifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07168417A true JPH07168417A (en) | 1995-07-04 |
Family
ID=18080453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31674693A Pending JPH07168417A (en) | 1993-12-16 | 1993-12-16 | Electrifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07168417A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002341628A (en) * | 2001-05-21 | 2002-11-29 | Ricoh Co Ltd | Image carrier unit and image forming apparatus provided with it |
| US6516169B2 (en) | 2000-08-31 | 2003-02-04 | Ricoh Company Limited | Electrophotographic image forming apparatus having a gap between photoreceptor and charger, and process cartridge therefor |
| EP1143304A3 (en) * | 2000-04-07 | 2003-11-12 | Ricoh Company, Ltd. | Apparatus for minimizing toner contamination on an image formation member |
| US6803162B2 (en) | 2001-07-26 | 2004-10-12 | Ricoh Company, Ltd. | Electrophotographic image forming apparatus, photoreceptor therefor and method for manufacturing the photoreceptor |
| EP1542087A3 (en) * | 2003-11-20 | 2005-06-22 | Ricoh Company, Ltd. | Methods and apparatus for electrophotographic image forming capable of charging evenly a photoconductive surface |
| US7693456B2 (en) | 2005-01-27 | 2010-04-06 | Ricoh Company, Ltd. | Conductive member and process cartridge having it and image forming apparatus having the process cartridge |
| US7734564B2 (en) | 2005-03-24 | 2010-06-08 | Yamatake Corporation | Method of data processing and program |
| JP2015022234A (en) * | 2013-07-22 | 2015-02-02 | 富士ゼロックス株式会社 | Power feeding structure, charging device, and image forming apparatus |
-
1993
- 1993-12-16 JP JP31674693A patent/JPH07168417A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1143304A3 (en) * | 2000-04-07 | 2003-11-12 | Ricoh Company, Ltd. | Apparatus for minimizing toner contamination on an image formation member |
| US6516169B2 (en) | 2000-08-31 | 2003-02-04 | Ricoh Company Limited | Electrophotographic image forming apparatus having a gap between photoreceptor and charger, and process cartridge therefor |
| JP2002341628A (en) * | 2001-05-21 | 2002-11-29 | Ricoh Co Ltd | Image carrier unit and image forming apparatus provided with it |
| US6803162B2 (en) | 2001-07-26 | 2004-10-12 | Ricoh Company, Ltd. | Electrophotographic image forming apparatus, photoreceptor therefor and method for manufacturing the photoreceptor |
| EP1542087A3 (en) * | 2003-11-20 | 2005-06-22 | Ricoh Company, Ltd. | Methods and apparatus for electrophotographic image forming capable of charging evenly a photoconductive surface |
| US7693456B2 (en) | 2005-01-27 | 2010-04-06 | Ricoh Company, Ltd. | Conductive member and process cartridge having it and image forming apparatus having the process cartridge |
| US7734564B2 (en) | 2005-03-24 | 2010-06-08 | Yamatake Corporation | Method of data processing and program |
| JP2015022234A (en) * | 2013-07-22 | 2015-02-02 | 富士ゼロックス株式会社 | Power feeding structure, charging device, and image forming apparatus |
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