JPH08160709A - Electrifying member and image forming device - Google Patents
Electrifying member and image forming deviceInfo
- Publication number
- JPH08160709A JPH08160709A JP6329784A JP32978494A JPH08160709A JP H08160709 A JPH08160709 A JP H08160709A JP 6329784 A JP6329784 A JP 6329784A JP 32978494 A JP32978494 A JP 32978494A JP H08160709 A JPH08160709 A JP H08160709A
- Authority
- JP
- Japan
- Prior art keywords
- roller
- charging member
- roller surface
- charged
- discharge
- 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.)
- Granted
Links
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば電子写真画像形
成装置等に用いられる接触又は近接式帯電装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact or proximity charging device used in, for example, an electrophotographic image forming apparatus.
【０００２】[0002]
【従来の技術】便宜上、電子写真複写機，レーザビーム
プリンタ，静電記録装置等の画像形成装置における感光
体の帯電処理を例にして説明する。2. Description of the Related Art For the sake of convenience, an explanation will be given by taking as an example a charging process of a photosensitive member in an image forming apparatus such as an electrophotographic copying machine, a laser beam printer, an electrostatic recording apparatus and the like.
【０００３】上記のような画像形成装置においては、像
担持体としての感光体や誘導体もしくは転写材等の可帯
電部材を所定の電位に均一帯電処理する工程を含んでい
る。The image forming apparatus as described above includes a step of uniformly charging a chargeable member such as a photoconductor as an image carrier, a derivative or a transfer material to a predetermined potential.
【０００４】その帯電手段として従来は、５〜１０ＫＶ
の高電圧を６０μｍ〜１００μｍの帯電ワイヤに印加す
ることによってコロナ放電させるコロナ帯電が広く利用
されてきた。Conventionally, 5 to 10 KV is used as the charging means.
Corona charging for corona discharge by applying a high voltage of 60 to 100 μm to a charging wire has been widely used.
【０００５】しかしながら、上記のコロナ帯電にはオゾ
ン発生等、種々の欠点があることから、それに変わるも
のとして接触及び近接式帯電が提案されている。However, since the above-mentioned corona charging has various drawbacks such as ozone generation, contact and proximity charging has been proposed as an alternative.
【０００６】接触及び近接式帯電は、帯電部材を被帯電
体面に押圧接触または近接させ該帯電部材に電圧（直流
電圧、あるいは直流電圧と交流電圧の重畳電圧など）を
印加することで、被帯電体面の所定の極性、電位に帯電
させるものである。In the contact and proximity charging, the charging member is brought into pressure contact with or close to the surface of the member to be charged and a voltage (DC voltage or a superimposed voltage of DC voltage and AC voltage) is applied to the charging member to charge the member to be charged. The body surface is charged to a predetermined polarity and potential.
【０００７】このような接触及び近接式帯電装置はコロ
ナ帯電装置に比較して低い印加電圧を使用し、オゾン発
生が少ない等の利点を有している。Such a contact and proximity type charging device has advantages that it uses a lower applied voltage and generates less ozone than the corona charging device.
【０００８】また、現在実用化されている接触式帯電部
材としては、ローラ形状のものが一般的であり、例えば
この場合には、導電性芯金の周りに、順に導電性弾性
層、抵抗制御層、表面層が積層された構造になっている
場合が多いが、少なくとも芯金と弾性体があればよい。Further, as a contact type charging member which has been put into practical use at present, a roller type member is generally used. In this case, for example, in this case, a conductive elastic layer and a resistance control are sequentially provided around a conductive cored bar. In many cases, it has a structure in which a layer and a surface layer are laminated, but at least a core metal and an elastic body are sufficient.
【０００９】この場合の弾性体の材料としては、例え
ば、ウレタン、ＳＢＲ、ＥＶＡ、ＳＢＳ、ＳＥＢＳ、Ｓ
ＩＳ、ＴＰＯ、ＥＰＤＭ、ＥＰＭ、ＮＢＲ、ＩＲ、Ｂ
Ｒ、シリコーンゴム、エピクロルヒドリンゴム等の樹脂
やゴム類などがあり、必要な抵抗値に応じ、例えば、カ
ーボンブラック、カーボン繊維、金属酸化物、金属粉、
過塩素酸塩等の固体電解質や界面活性剤等の導電性付与
材を添加したものなどがある。The material of the elastic body in this case is, for example, urethane, SBR, EVA, SBS, SEBS, S.
IS, TPO, EPDM, EPM, NBR, IR, B
There are resins and rubbers such as R, silicone rubber, and epichlorohydrin rubber. Depending on the required resistance value, for example, carbon black, carbon fiber, metal oxide, metal powder,
For example, a solid electrolyte such as perchlorate or a conductivity-imparting material such as a surfactant may be added.
【００１０】抵抗制御体の材料としては、例えば、ポリ
アミド、ポリウレタン、フッ素、ポリビニルアルコー
ル、シリコン、ＮＢＲ、ＥＰＤＭ、ＣＲ、ＩＲ、ＢＲ、
ヒドリンゴム等の樹脂やゴム類などがあり、そこに例え
ば、導電性あるいは絶縁性のフィラーや添加剤等を混合
したものがある。As the material of the resistance control body, for example, polyamide, polyurethane, fluorine, polyvinyl alcohol, silicon, NBR, EPDM, CR, IR, BR,
There are resins such as hydrin rubber and rubbers, and for example, there are those in which conductive or insulating fillers and additives are mixed.
【００１１】上記のような材料を使用し、帯電部材の電
気抵抗値を１×１０3 〜１×１０10Ωにするが、最終的
にこの値になるのであれば、上記の材料の組み合わせは
特に問わない。The above-mentioned materials are used and the electric resistance value of the charging member is set to 1 × 10 3 to 1 × 10 10 Ω. It doesn't matter.
【００１２】これらの帯電部材を利用し、トナー容器や
現像機、などを一体化したカートリッジが一般に使用さ
れているが、これらのカートリッジは３０００〜８００
０枚程度印字するとトナーが無くなり、その時点でカー
トリッジ寿命が終了するものが一般的である。Cartridges in which a toner container, a developing machine, and the like are integrated using these charging members are generally used. These cartridges are 3000 to 800.
It is common that the toner runs out when printing about 0 sheets and the cartridge life ends at that point.
【００１３】[0013]
【発明が解決しようとする課題】しかしながら、最近は
環境問題やコンピュータのネットワーク化によるプリン
タの負担増大などもあり、カートリッジの高耐久化の要
求が高まりつつあり、接触及び近接式帯電を利用したカ
ートリッジを高耐久化した場合、次のような問題があっ
た。However, recently, due to environmental problems and increased burden on the printer due to network of computers, the demand for high durability of the cartridge is increasing, and the cartridge using contact and proximity charging. In case of high durability, there were the following problems.
【００１４】微少空隙での放電を利用している接触及び
近接式帯電装置では、帯電部材が有機感光体面に接触ま
たは近接するため、帯電部材の接触または近接面付近で
の放電の影響が有機感光体に強く作用することになり、
被帯電体部材の表面を劣化させ削れやすい。In the contact and proximity type charging device utilizing the discharge in the minute gap, since the charging member is in contact with or close to the surface of the organic photosensitive member, the influence of the discharge of the contact of the charging member or the vicinity of the proximity surface of the organic photosensitive member is affected. Will have a strong effect on the body,
The surface of the member to be charged is deteriorated and easily scraped.
【００１５】また、有機感光体の膜厚が一定でない場
合、その部位に帯電部材が接触したり近接するとその部
分に放電が集中し、局部的な削れが発生する。これらの
影響は帯電部材の両端部にて特に発生しやすい。Further, when the film thickness of the organic photoconductor is not constant, when the charging member comes into contact with or comes close to the portion, the discharge concentrates on the portion, and local scraping occurs. These effects are particularly likely to occur at both ends of the charging member.
【００１６】これは接触帯電の場合、放電は有機感光体
との接触部分から僅かに離れた部分で発生するものであ
るから、従来の帯電部材は放電部分をドラム周方向から
見た場合、帯電部材の両端部からの放電面積はドラム周
方向に対し広くなるため、放電時間が他の部分より長く
なるので、有機感光体の劣化が早く発生する。This is because in the case of contact charging, the discharge is generated at a portion slightly apart from the contact portion with the organic photoconductor, so that the conventional charging member is charged when the discharged portion is viewed from the circumferential direction of the drum. Since the discharge area from both end portions of the member becomes wider in the drum circumferential direction, the discharge time becomes longer than other portions, so that the deterioration of the organic photoconductor occurs earlier.
【００１７】そこで、特開平４−１５７４８３号に見ら
れるように、帯電部材端部のリーク防止のため端部を高
抵抗化するようにしたものも提案されている。Therefore, as disclosed in Japanese Unexamined Patent Publication No. 4-157483, there has been proposed a device in which the end of the charging member has a high resistance in order to prevent the end leak.
【００１８】しかし、この場合、帯電部材に流す電流値
が低い場合には、十分効果があるが、プリンタの高速化
に伴って、電流値を上げた場合、非画像領域のみ絶縁に
近い高抵抗体を形成し、１段階放電電流を減少させただ
けのものでは、放電電流が切り替わる部分での放電が強
くなることがあり、効果が不十分になる場合があった
り、仮に放電電流が切り替わる部分の抵抗差を少なくす
るために高抵抗体でなく画像領域より若干抵抗を高くし
たものを作成したとしても、最端部からの放電抑制効果
が少なくなることで効果が不十分になる。However, in this case, when the current value flowing through the charging member is low, it is sufficiently effective, but when the current value is increased as the printer speed increases, only the non-image area has a high resistance close to insulation. If the body is formed and the discharge current is reduced only by one step, the discharge at the part where the discharge current is switched may become stronger, and the effect may be insufficient, or the part where the discharge current is temporarily switched. Even if a resistor having a resistance slightly higher than that of the image region is prepared in order to reduce the difference in resistance, the effect is insufficient because the effect of suppressing discharge from the outermost end is reduced.
【００１９】また、特開昭６３−２０８８７７３号，特
開平１−１７９９５９号に見られるように端部をテーパ
形状やＲ形状を付け端部の電界強度を弱めるものも提案
されている。Further, as disclosed in JP-A-63-2088773 and JP-A-1-179959, there has been proposed a taper-shaped or R-shaped end to weaken the electric field strength at the end.
【００２０】しかし、この場合も、帯電部材に流す電流
値が低い場合には、十分効果があるが、プリンタの高速
化に伴って、電流値を上げた場合、最外部分でテーパ形
状やＲ形状を付けただけでは、放電抑止効果が不十分に
なる場合があった。However, in this case as well, when the current value flowing through the charging member is low, the effect is sufficient, but when the current value is increased as the printer speed increases, the taper shape or R at the outermost portion is obtained. In some cases, the effect of suppressing the discharge is insufficient only by giving the shape.
【００２１】他の方法としては、例えばドラム膜厚を厚
くすることにより表面劣化部分の影響を少なくする方法
があるが、膜厚を厚くすると環境変動の影響をうけやす
くなったり、工程上膜厚を厚くすると厚みむらが出やす
くそのために画像の濃度むらが発生するという欠点があ
った。As another method, there is a method of reducing the influence of the surface-deteriorated portion by increasing the thickness of the drum, for example. If the thickness is increased, unevenness in thickness is likely to occur, which causes unevenness in image density.
【００２２】本発明は上記従来技術の問題を解決するた
めになされたもので、その目的とするところは、被帯電
体に悪影響を与えることのない帯電部材を提供すること
にある。The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a charging member that does not adversely affect the member to be charged.
【００２３】[0023]
【課題を解決するための手段】上記目的を達成するため
に本発明にあっては、電圧を印加し、被帯電体に近接ま
たは接触し、被帯電体を帯電処理するローラ形状の帯電
部材において、この帯電部材本体はローラ長手方向に移
動せずに放電領域が長手方向に移動することを特徴とす
る。In order to achieve the above object, the present invention provides a roller-shaped charging member for applying a voltage to approach or contact a member to be charged to charge the member. The charging member main body is characterized in that the discharge region moves in the longitudinal direction without moving in the roller longitudinal direction.
【００２４】被帯電体に近接または接触するローラ面の
端部がローラ面の動径によりローラ長手方向に移動する
とよい。It is preferable that the end of the roller surface that is close to or in contact with the member to be charged moves in the roller longitudinal direction due to the radius of movement of the roller surface.
【００２５】被帯電体に近接または接触するローラ面の
端部は、ローラ形状の端部が面取りされ、ローラ面とこ
の面取り面との境界であるとよい。The end of the roller surface that is close to or in contact with the member to be charged is chamfered at the end of the roller shape, and is preferably the boundary between the roller surface and this chamfered surface.
【００２６】被帯電体に近接または接触するローラ面の
端部は、帯電部材本体の端部に電気抵抗値が高い高抵抗
部を設け、ローラ面とこの高抵抗部との境界とすること
もできる。At the end of the roller surface that is close to or in contact with the member to be charged, a high resistance portion having a high electric resistance value may be provided at the end of the charging member main body to serve as a boundary between the roller surface and this high resistance portion. it can.
【００２７】ローラ面の電気抵抗値は１×１０4 〜１×
１０10Ωであり、高抵抗部の電気抵抗値はローラ面より
６倍以上高いとよい。The electric resistance value of the roller surface is 1 × 10 4 to 1 ×
It is 10 10 Ω, and the electric resistance value of the high resistance portion is preferably 6 times higher than that of the roller surface.
【００２８】被帯電体に近接または接触するローラ面の
端部は、ローラ形状の周方向からみて波形であるとよ
い。It is preferable that the end of the roller surface that is close to or in contact with the member to be charged has a corrugated shape when viewed in the circumferential direction of the roller shape.
【００２９】波形は正弦波形であるとよい。The waveform may be a sine waveform.
【００３０】[0030]
【作用】上記のように構成された帯電部材では、帯電部
材本体はローラ長手方向に移動せずに放電領域が長手方
向に移動するので、被帯電体に対する放電の集中が緩和
される。In the charging member constructed as described above, since the charging member main body does not move in the roller longitudinal direction but the discharge region moves in the longitudinal direction, the concentration of discharge on the body to be charged is alleviated.
【００３１】ローラ面の端部がローラ面の動径によりロ
ーラ長手方向に移動することで、放電領域を移動しやす
い。The end portion of the roller surface moves in the roller longitudinal direction due to the radius of movement of the roller surface, so that the discharge area is easily moved.
【００３２】端部が、ローラ形状の端部が面取りされ、
ローラ面とこの面取り面との境界であること、または、
帯電部材本体の端部に電気抵抗値が高い高抵抗部を設
け、ローラ面とこの高抵抗部との境界とすることで、簡
単な構成となる。The end of the roller shape is chamfered,
Be the boundary between the roller surface and this chamfer, or
By providing a high resistance portion having a high electric resistance value at the end portion of the charging member main body and defining a boundary between the roller surface and the high resistance portion, a simple structure is obtained.
【００３３】被帯電体に近接または接触するローラ面の
端部は、ローラ形状の周方向からみて波形であること
で、放電領域の移動が平均化される。The end portion of the roller surface that is close to or in contact with the member to be charged has a waveform when viewed in the circumferential direction of the roller shape, so that the movement of the discharge region is averaged.
【００３４】波形は正弦波形であることで、さらに平均
化される。Since the waveform is a sine waveform, it is further averaged.
【００３５】[0035]
（概要）上述の課題は帯電部材の両端部からの放電集中
を緩和させることにより解決される。(Outline) The above-mentioned problems are solved by alleviating discharge concentration from both ends of the charging member.
【００３６】すなわち、本発明は、帯電部材の放電領域
を長手方向に移動させることにより放電領域最外部分が
被帯電体の回転周方向に対し横方向（軸方向）移動する
ので、その結果両端部の放電集中幅が広がり、被帯電体
としてのドラムに対する放電の集中を緩和させることが
できる。That is, according to the present invention, by moving the discharge area of the charging member in the longitudinal direction, the outermost portion of the discharge area moves laterally (axially) with respect to the circumferential direction of rotation of the member to be charged. The discharge concentration width of the portion is widened, and the discharge concentration on the drum as the member to be charged can be reduced.
【００３７】なお、以下に示す実施例では、ロール形状
帯電部材の動径（回転位置，回転角度）によって、放電
領域を回転周方向に対し横方向（軸方向）に移動させて
いる。In the embodiments described below, the discharge region is moved laterally (axial direction) with respect to the circumferential direction of rotation by the radius vector (rotational position, rotational angle) of the roll-shaped charging member.
【００３８】放電集中を緩和させる方法としては、ロー
ル形状帯電部材のドラム当接または近接部分と端部カッ
ト部分の頂点の形状を波形にするもの、端部放電を減少
させるために絶縁塗装を帯電部材端部に塗布し、その塗
装部分と非塗装部分の界面を波形にするもの、がある。As a method for alleviating the discharge concentration, the shape of the apex of the roll-shaped charging member abutting on or near the drum and the apex of the end cut portion is corrugated, and the insulating coating is charged to reduce the end discharge. There is one that is applied to the end portion of a member and the interface between the painted portion and the unpainted portion is corrugated.
【００３９】以下に本発明を図示の実施例の基づいて説
明する。The present invention will be described below based on the illustrated embodiments.
【００４０】ロール形状帯電部材のドラム当接または近
接部分と端部カット部分の頂点の形状を波形にする場
合、図１のようにドラムに当接または近接するローラ面
４と面取り面５の境界（端部）３をローラ２の周方向か
ら見て波形にするもの、また、図２のように面取り面５
を作らず、直接ローラ２の端部をカットし、ローラ面４
の端部６を波形にするもの、がある。When the shape of the vertices of the abutting or proximate portion of the roll-shaped charging member on the drum and the apex of the end cut portion is corrugated, the boundary between the roller surface 4 and the chamfered surface 5 abutting or adjoining the drum as shown in FIG. What makes the (end) 3 corrugated when viewed from the circumferential direction of the roller 2, and the chamfered surface 5 as shown in FIG.
Without making, cut the end of the roller 2 directly,
There is one that corrugates the end 6 of the.
【００４１】このように境界３または端部６を周方向か
ら見て波形に形成することで、ローラ２の回転位置（動
径）のよって、ローラ面４の位置が回転周方向に対し横
方向（軸方向）に移動することになり、ローラ２自体は
軸方向に移動しないで、ローラ面４の位置、つまり、放
電領域を軸方向に移動できる。By thus forming the boundary 3 or the end portion 6 in a corrugated shape when viewed from the circumferential direction, the position of the roller surface 4 is lateral to the circumferential direction of rotation depending on the rotational position (moving radius) of the roller 2. Since the roller 2 itself moves in the (axial direction), the position of the roller surface 4, that is, the discharge region can be moved in the axial direction without moving the roller 2 itself in the axial direction.
【００４２】図１乃至図２の端部カット部分のローラ２
の周方向から見る横移動量は、軸１を中心にローラ２が
一周する間に１ｍｍ以上が望ましい。１ｍｍ未満である
場合、放電領域があまり移動せず変わらないため本発明
の効果が得られにくい。The roller 2 at the end cut portion in FIGS.
The lateral movement amount viewed from the circumferential direction is preferably 1 mm or more while the roller 2 makes one revolution around the shaft 1. If it is less than 1 mm, the effect of the present invention is difficult to obtain because the discharge region does not move much and does not change.
【００４３】また、これらのローラ２は被覆層をつけた
場合、被覆層なしの場合においても最終的に上記の形状
であれば同様の効果が得られる。Further, when these rollers 2 are provided with a coating layer, the same effect can be obtained even if the roller 2 is not provided with the coating layer as long as it has the above-mentioned shape.
【００４４】なお、本発明中の面取り面と呼んでいる面
は図４に示すように帯電部材と被帯電体とが接触もしく
は近接するローラ面４上の任意の点１０と帯電部材の端
面９上の任意の点１１を結ぶ線にて全周的に形成された
面１２のことである。この実施例では面取り角度をαと
している。The surface called the chamfered surface in the present invention is, as shown in FIG. 4, an arbitrary point 10 on the roller surface 4 where the charging member and the member to be charged contact or come close to each other and the end surface 9 of the charging member. It is a surface 12 formed on the entire circumference by a line connecting the arbitrary points 11 above. In this embodiment, the chamfering angle is α.
【００４５】帯電部材の非画像領域部に画像領域部より
電気抵抗を高くした塗料を塗布し、かつその塗布形態は
ロール形状のとき周方向から見て波形にする場合、図３
に示すように非画像領域部となる端部の電気抵抗値を画
像領域より６倍以上高くした高抵抗部７と、画像領域部
となるローラ面４との境界（端部）８を、ローラ２の周
方向からみて波形に形成する方法、がある。When a coating material having a higher electric resistance than that of the image area portion is applied to the non-image area portion of the charging member and the application form is a roll shape and has a corrugated shape when viewed from the circumferential direction, FIG.
As shown in FIG. 3, the boundary (end) 8 between the high resistance portion 7 in which the electric resistance value of the end portion which is the non-image area portion is 6 times higher than that of the image area and the roller surface 4 which is the image area portion is There is a method of forming a waveform when viewed from the circumferential direction of 2.
【００４６】帯電部材の非画像領域部の電気抵抗値を画
像領域部の電気抵抗値より高くした場合の非画像領域部
の塗料の抵抗値は画像領域部抵抗値の１×１０4 Ωから
１×１０10Ωより６倍以上大きい値が望ましく、図３の
ように帯電部材塗布部分に塗布した場合の高抵抗塗料塗
装部分の高抵抗部７と非塗装部分の境界８の横移動量は
ローラ２が一周する間に１ｍｍ以上が望ましい。１ｍｍ
未満である場合、放電領域があまり移動せず変わらない
ため本発明の効果が得られにくい。When the electric resistance value of the non-image area portion of the charging member is made higher than the electric resistance value of the image area portion, the resistance value of the paint in the non-image area portion is 1 × 10 4 Ω of the image area portion resistance value to 1 It is desirable that the value is more than 6 times larger than × 10 10 Ω, and the lateral movement amount between the high resistance portion 7 of the high resistance paint coated portion and the boundary 8 of the non-painted portion when applied to the charging member application portion as shown in FIG. It is desirable that the distance is 1 mm or more during one round of 2. 1 mm
If it is less than the above, the effect of the present invention is difficult to obtain because the discharge region does not move much and does not change.
【００４７】これらのローラ２は被覆層をつけた場合や
被覆層なしの場合においても最終的に上記の形状であれ
ば同様の効果が得られ、その被覆層は非画像領域に高抵
抗塗料を塗布したのち被覆しても良い。With these rollers 2, the same effect is finally obtained with the above-mentioned shape even when a coating layer is provided or without a coating layer, and the coating layer has a high resistance paint in the non-image area. You may coat after applying.
【００４８】なお、これら本発明に記述する電気抵抗値
は帯電部材の支持体と接触または近接する面との間を部
分的に測定した値であり体積固有抵抗とは異なる。The electric resistance value described in the present invention is a value obtained by partially measuring the surface of the charging member, which is in contact with or close to the support of the charging member, and is different from the volume resistivity.
【００４９】また、本発明に用いられる波形は交流電流
で言うところの正弦波、三角波、のこぎり波、ひずみ
波、方形波などであるが、正弦波、三角波が望ましい。The waveform used in the present invention may be a sine wave, a triangular wave, a sawtooth wave, a distorted wave, a square wave, etc., which are so-called AC currents, but a sine wave and a triangular wave are preferable.
【００５０】正弦波及び三角波であると本発明の目的で
ある放電領域の横移動が平均化するためである。This is because a sine wave and a triangular wave average the lateral movement of the discharge region, which is the object of the present invention.
【００５１】方形波は放電領域が２極化するため効果は
出るものの正弦波及び三角波と比較して効果が少ない。The square wave is effective because the discharge region is polarized, but is less effective than the sine wave and the triangular wave.
【００５２】ひずみ波及びのこぎり波の場合、効果は正
弦波及び三角波とあまりかわらないものの、加工が困難
である。In the case of the distorted wave and the sawtooth wave, the effect is not so different from the sine wave and the triangular wave, but the processing is difficult.
【００５３】本発明に用いる塗料の樹脂としては例え
ば、ポリアミド、ポリウレタン、フッ素、ポリビニルア
ルコール、シリコン、ＮＢＲ、ＥＰＤＭ、ＣＲ、ＩＲ、
ＢＲ、ヒドリンゴム等の樹脂やゴム類を挙げることがで
き、そこに例えば、絶縁性又は導電性のフィラーや添加
剤等を混合しても良い。Examples of the resin of the paint used in the present invention include polyamide, polyurethane, fluorine, polyvinyl alcohol, silicone, NBR, EPDM, CR, IR,
Examples thereof include resins and rubbers such as BR and hydrin rubber, and an insulating or conductive filler or additive may be mixed therein.
【００５４】本発明により、製造した帯電部材は直流電
圧、あるいは直流電圧と交流電圧の重畳電圧を印加した
もののいずれにおいても使用できる。The charging member produced according to the present invention can be used with either a DC voltage or a voltage applied with a superimposed voltage of a DC voltage and an AC voltage.
【００５５】また、本発明に用いられる被帯電体として
は、例えば導電性支持体の上に有機感光体層を設けたも
ので必要に応じて両者間にバリア機能と接着機能を持つ
下引層を設けても良い。The member to be charged used in the present invention is, for example, a conductive support provided with an organic photoreceptor layer, and an undercoat layer having a barrier function and an adhesive function between the two, if necessary. May be provided.
【００５６】このような有機感光体の特徴として、安全
性が高い、導電性が良好、生産性が良い、安価であるな
どの理由から被帯電体として用いられることが多いが、
反面、下記に示す通り、結着剤として樹脂が用いられる
ことが一般的であるため、放電による分子量低下などの
影響をうけやすい。The characteristic features of such an organic photoreceptor are that it is often used as a member to be charged because of its high safety, good conductivity, good productivity, and low cost.
On the other hand, as shown below, since a resin is generally used as a binder, it is easily affected by a decrease in molecular weight due to discharge.
【００５７】しかし、本発明の帯電部材を用いることに
より、有機感光体の特徴を生かしつつ高耐久が可能とな
る。However, by using the charging member of the present invention, high durability can be achieved while taking advantage of the characteristics of the organic photoconductor.
【００５８】本発明に用いられる被帯電体用導電性支持
体としては、例えば以下に示したものがある。Examples of the conductive support for the member to be charged used in the present invention include those shown below.
【００５９】（１）アルミニウム、アルミニウム合金、
ステンレス、銅などの金属を使用する。(1) Aluminum, aluminum alloys,
Use metals such as stainless steel and copper.
【００６０】（２）ガラス、樹脂、紙などの非導電性支
持体や前記（１）の導電性支持体の表面にアルミニウ
ム、パラジウム、ロジウム、金、白金などの金属を蒸着
もしくはラミネートすることにより薄膜を形成したもの
を使用する。(2) By vapor-depositing or laminating a metal such as aluminum, palladium, rhodium, gold or platinum on the surface of the non-conductive support such as glass, resin or paper or the conductive support of the above (1). A thin film is used.
【００６１】（３）ガラス、樹脂、紙などの非導電性支
持体や前記（１）の導電性支持体の表面に導電性高分
子、酸化スズ、酸化インジウムなどの導電性化合物の層
を蒸着もしくは塗布することにより形成したものを使用
する。(3) A layer of a conductive compound such as a conductive polymer, tin oxide or indium oxide is vapor-deposited on the surface of a non-conductive support such as glass, resin or paper or the conductive support of (1) above. Alternatively, the one formed by coating is used.
【００６２】下引層形成材料としては、通常、ポリビニ
ルアルコール、ポリエチレンオキシド、エチルセルロー
ス、メチルセルロース、カゼイン、ポリアミド、ニカ
ワ、ゼラチンなどが用いられる。As the material for forming the undercoat layer, polyvinyl alcohol, polyethylene oxide, ethyl cellulose, methyl cellulose, casein, polyamide, glue, gelatin and the like are usually used.
【００６３】有機感光層は、電荷発生層と電荷輸送層か
らなり、例えば、電荷注入制御のために感光層の上に保
護層を設けてもよい。The organic photosensitive layer comprises a charge generation layer and a charge transport layer, and for example, a protective layer may be provided on the photosensitive layer for charge injection control.
【００６４】電荷発生層は、電荷発生物質を適当な結着
剤に分散し、これを導電性支持体上に塗装することによ
り形成することができる。The charge-generating layer can be formed by dispersing the charge-generating substance in a suitable binder and coating it on a conductive support.
【００６５】また、導電性支持体上に蒸着、スパッタ、
ＣＶＤなどの乾式法で薄膜を形成することもできる。Further, vapor deposition, sputtering,
The thin film can also be formed by a dry method such as CVD.
【００６６】電荷発生物質としては、たとえば以下のよ
うな物質が挙げられる。これらの電荷発生物質は単独で
用いても良く、２種類以上組み合わせて用いることもで
きる。Examples of the charge generating substance include the following substances. These charge generating substances may be used alone or in combination of two or more.
【００６７】（１）モノアゾ、ビスアゾ、トリスアゾな
どのアゾ系顔料を使用する。(1) An azo pigment such as monoazo, bisazo or trisazo is used.
【００６８】（２）インジゴ、チオインジゴなどのイン
ジゴ系顔料を使用する。(2) Indigo pigments such as indigo and thioindigo are used.
【００６９】（３）金属フタロシアニン、非金属フタロ
シアニンなどのフタロシアニン系顔料を使用する。(3) Phthalocyanine pigments such as metal phthalocyanine and non-metal phthalocyanine are used.
【００７０】（４）ペリレン酸無水物、ペリレン酸イミ
ドなどのペリレン系顔料を使用する。(4) Perylene-based pigments such as perylene anhydride and perylene imide are used.
【００７１】（５）アンスラキノン、ヒドロキノンなど
の多環キノン系顔料を使用する。(5) Polycyclic quinone pigments such as anthraquinone and hydroquinone are used.
【００７２】（６）スクワリリウム色素などの顔料を使
用する。(6) A pigment such as squarylium dye is used.
【００７３】（７）ピリリウム塩、チオピリリウム塩類
などの顔料を使用する。(7) A pigment such as pyrylium salt or thiopyrylium salt is used.
【００７４】（８）トリフェニルメタン系色素などの顔
料を使用する。(8) A pigment such as triphenylmethane dye is used.
【００７５】また、結着剤としては広範囲な結着樹脂か
ら選択でき、例えばポリカーボネート樹脂、ポリエステ
ル樹脂、ポリアクリレート樹脂、ブチラール樹脂、ポリ
スチレン樹脂、ポリビニルアセタール樹脂、ジアリルフ
タレート樹脂、アクリル樹脂、メタクリ樹脂、酢酸ビニ
ル樹脂、フェノール樹脂、シリコーン樹脂、ポリスルホ
ン樹脂、スチレン−ブタジエン共重合樹脂、アルキッド
樹脂、エポキシ樹脂、尿素樹脂、塩化ビニル−酢酸ビニ
ル共重合体樹脂などが挙げられるが、これらに限定され
るものではない。The binder can be selected from a wide range of binder resins such as polycarbonate resin, polyester resin, polyacrylate resin, butyral resin, polystyrene resin, polyvinyl acetal resin, diallyl phthalate resin, acrylic resin, methacrylic resin, Examples include, but are not limited to, vinyl acetate resin, phenol resin, silicone resin, polysulfone resin, styrene-butadiene copolymer resin, alkyd resin, epoxy resin, urea resin, vinyl chloride-vinyl acetate copolymer resin, and the like. is not.
【００７６】また、これらは、単独または共重合体ポリ
マーとして１種または２種以上混合してもよい。Further, these may be used alone or in combination of two or more as a homopolymer or a copolymer polymer.
【００７７】電荷発生層中に含有する樹脂は、８０重量
％以下、好ましくは４０重量％以下がよい。The content of the resin in the charge generation layer is 80% by weight or less, preferably 40% by weight or less.
【００７８】また、電荷発生層の膜厚は５μｍ以下、特
に０．０１μｍ〜２μｍの薄膜層とすることが好まし
い。電荷発生層にはさらに種々の増感剤を添加してもよ
い。The thickness of the charge generation layer is 5 μm or less, preferably 0.01 μm to 2 μm. Various sensitizers may be further added to the charge generation layer.
【００７９】電荷発生層は主として電荷輸送物質と結着
樹脂とを溶剤中に溶解させた塗料を塗工・乾燥して成形
する。電荷輸送物質としては各種のトリアリールアミン
系化合物、ヒドラゾン化合物、スチルベン化合物、ピラ
ゾリン系化合物、オキサゾール系化合物、チアゾール系
化合物、トリアリールメタン系化合物などが挙げられ
る。また、結着樹脂としては上述したものを用いること
ができる。The charge generating layer is formed by coating and drying a paint in which a charge transporting substance and a binder resin are dissolved in a solvent. Examples of the charge transport material include various triarylamine compounds, hydrazone compounds, stilbene compounds, pyrazoline compounds, oxazole compounds, thiazole compounds, triarylmethane compounds, and the like. Further, as the binder resin, those mentioned above can be used.
【００８０】これらの有機感光層の塗布には、従来知ら
れたディッピング法、スプレーコーティング法、スピン
ナーコーティング法、ビードコーティング法、ブレード
コーティング法、ビームコーティング法、ロールコーテ
ィング法などいずれの方法も用いることができる。For coating the organic photosensitive layer, any of conventionally known methods such as dipping method, spray coating method, spinner coating method, bead coating method, blade coating method, beam coating method and roll coating method can be used. You can
【００８１】このような材料を用いて有機感光体を作成
し、カートリッジなどに使用する。An organic photoconductor is prepared using such a material and used in a cartridge or the like.
【００８２】（実施例１） （弾性層用コンパウンドの調整）ＥＰＤＭ１００重量
部、酸化亜鉛５重量部、高級脂肪酸１重量部、導電性カ
ーボンブラック５重量部、パラフィンオイル１０重量
部、硫黄２重量部、加硫促進剤ＭＢＴ１重量部、加硫促
進剤ＴＭＴＤ１．５重量部、加硫促進剤ＺｎＭＤＣ１．
５重量部を２本ロールにて冷却しながら２０分間混合
し、コンパウンドを作成した。(Example 1) (Adjustment of compound for elastic layer) EPDM 100 parts by weight, zinc oxide 5 parts by weight, higher fatty acid 1 part by weight, conductive carbon black 5 parts by weight, paraffin oil 10 parts by weight, sulfur 2 parts by weight. , Vulcanization accelerator MBT 1 part by weight, vulcanization accelerator TMTD 1.5 parts by weight, vulcanization accelerator ZnMDC1.
A compound was prepared by mixing 5 parts by weight for 20 minutes while cooling with two rolls.
【００８３】（被覆層用塗料の調整）メチロール化ナイ
ロン１００重量部、メタリール４２０重量部、トルエン
１５０重量部を混合し、ナイロン塗料を調整した。(Preparation of Coating Layer Coating Material) 100 parts by weight of methylolated nylon, 420 parts by weight of metal reel and 150 parts by weight of toluene were mixed to prepare a nylon coating material.
【００８４】（帯電部材の電気抵抗値測定方法）温度２
２．５℃、湿度５５％ＲＨの条件下で、帯電部材にアル
ミ箔のような良導電性の薄膜を幅１ｃｍ、長さ１０ｃｍ
に切り、それを巻つけて、芯金と薄膜の両端にディジタ
ルメグオームハイテスタ（ＨＩＯＫＩ製）を接続し、直
流電圧２５０Ｖ印加し、１０秒後の値を読み取る。(Method for measuring electric resistance of charging member) Temperature 2
Under conditions of 2.5 ° C and humidity of 55% RH, a thin film of good conductivity such as aluminum foil is used for the charging member with a width of 1 cm and a length of 10 cm.
It is cut into pieces and wound, and a digital meguohm high tester (manufactured by HIOKI) is connected to both ends of the cored bar and the thin film, a DC voltage of 250 V is applied, and the value after 10 seconds is read.
【００８５】（帯電部材の作成、評価）直径６ｍｍのス
テンレス製芯金にまず、上記弾性層用コンパウンドを１
５０℃で、１５分間加熱加硫させ、厚さ３ｍｍの弾性層
を有するゴムローラを得た。(Preparation and Evaluation of Charging Member) A stainless steel core having a diameter of 6 mm was first coated with the above compound for elastic layer 1
It was heated and vulcanized at 50 ° C. for 15 minutes to obtain a rubber roller having an elastic layer with a thickness of 3 mm.
【００８６】次に図１に見られるように、このローラ２
の両端部を周方向から見て波形に面取りした。この時の
面取り部分の波高は４ｍｍで、波長は９．４２ｍｍと
し、波系は正弦波とし両端部を周方向から見て不定型で
ドラム当接部分と端部カット部分の境界３がローラ２を
一周する間に４ｍｍ横移動するようにした。Next, as seen in FIG. 1, this roller 2
Both ends of the were chamfered in a wavy shape when viewed from the circumferential direction. At this time, the wave height of the chamfered portion was 4 mm, the wavelength was 9.42 mm, the wave system was a sine wave, and both ends were indefinite when viewed from the circumferential direction, and the boundary 3 between the drum contact portion and the end cut portion was the roller 2 It was arranged to move laterally by 4 mm during one round.
【００８７】次に被覆層用塗料で浸漬塗布し、放電部分
がドラム周方向から見て横移動する帯電部材を得た。こ
のときのローラ２の電気抵抗値は画像部、非画像部共に
１×１０6 Ωであった。Next, the coating material for the coating layer was applied by dipping to obtain a charging member in which the discharging portion laterally moved when viewed from the drum circumferential direction. At this time, the electric resistance value of the roller 2 was 1 × 10 6 Ω in both the image area and the non-image area.
【００８８】この帯電部材をレーザービームプリンタ
（レーザージェット４ｓｉ ヒューレットパッカードラ
ム製）の一次帯電器位置に取り付け、直流電圧−７５０
Ｖ，交流電圧２．０ＫＶ（ピーク間電圧），周波数６５
０Ｈｚにて重畳印加し、高温、高湿（３２．５℃，８５
％ＲＨ）環境で１０，０００枚印字後のドラム削れ量を
測定したところドラムと帯電部材の当接面で中央部の削
れ量は８μｍであり、帯電部材端部に接しているドラム
部分は帯電部材両端部の放電部分がドラム周方向に対し
横移動したので、放電集中が緩和され、そのためその部
位の削れ量は９μｍであり中央部はほとんど変わらなか
ったので、初期と変わらない良好な画像が得られ、耐久
性が高いことがわかった。This charging member was attached to the position of the primary charger of the laser beam printer (laser jet 4si, manufactured by Hewlett Packard Packer Drum), and the DC voltage was -750.
V, AC voltage 2.0 KV (peak-to-peak voltage), frequency 65
Superimposed application at 0 Hz, high temperature and high humidity (32.5 ° C, 85
% RH) After measuring the amount of scraped drum after printing 10,000 sheets, the scraped amount at the center of the contact surface between the drum and the charging member is 8 μm, and the drum part in contact with the end of the charging member is charged. Since the discharge parts at both ends of the member moved laterally with respect to the drum circumferential direction, the discharge concentration was relieved. Therefore, the scraped amount at that part was 9 μm and the center part was almost unchanged, so a good image that was the same as the initial image was obtained. It was obtained and found to have high durability.
【００８９】（実施例２） （弾性層用コンパウンドの調整）使用したゴムをＳＢＲ
に変えた以外は実施例１に同じである。(Example 2) (Adjustment of compound for elastic layer) The rubber used was SBR.
The same as Example 1 except that it was changed to.
【００９０】（被覆層用塗料の調整）実施例１に同じで
ある。(Preparation of coating material for coating layer) The same as in Example 1.
【００９１】（帯電部材の作成、評価）直径６ｍｍのス
テンレス製芯金にまず、上記弾性層用コンパウンドを１
５０℃で、１５分間加熱加硫させ、厚さ３ｍｍの弾性層
を有するゴムローラを得た。(Preparation and Evaluation of Charging Member) A stainless steel core having a diameter of 6 mm was first coated with the above compound for elastic layer.
It was heated and vulcanized at 50 ° C. for 15 minutes to obtain a rubber roller having an elastic layer with a thickness of 3 mm.
【００９２】次にこのローラ２を図１の様に両端部を面
取りせず、図２のようにドラム当接部分とローラ２の端
面が交わる部分を波型に切削した。この時の切削部分の
波高は２．５ｍｍで、波長は９．４２ｍｍとし、両端部
を周方向から見て不定型でドラム当接部分と端部カット
部分の頂点がローラ２を一周する間に２．５ｍｍ横移動
するようにした。Next, as shown in FIG. 1, both ends of the roller 2 were not chamfered, and the portion where the drum contact portion and the end surface of the roller 2 intersect each other was corrugated as shown in FIG. At this time, the wave height of the cut portion was 2.5 mm, the wavelength was 9.42 mm, and both ends were indeterminate when viewed from the circumferential direction, while the apex of the drum abutting portion and the end cut portion made one round of the roller 2. It was designed to move laterally by 2.5 mm.
【００９３】次に被覆層用塗料で浸漬塗布し、放電最外
部分がドラム周方向から見て横移動する帯電部材を得
た。このときのローラ２の電気抵抗値は画像部、非画像
部共に１×１０6 Ωであった。Next, the coating material for the coating layer was applied by dipping to obtain a charging member in which the outermost portion of the discharge moved laterally when viewed from the drum circumferential direction. At this time, the electric resistance value of the roller 2 was 1 × 10 6 Ω in both the image area and the non-image area.
【００９４】この帯電部材をレーザービームプリンタ
（レーザージェット４ｓｉ ヒューレットパッカード
製）の一次帯電器位置に取り付け、直流電圧−７５０
Ｖ，交流電圧２．０ＫＶ（ピーク間電圧），周波数６５
０Ｈｚにて重畳印加し、高温、高湿（３２．５℃，８５
％ＲＨ）環境で１０，０００枚印字後のドラム削れ量を
測定したところドラムと帯電部材の当接面で中央部の削
れ量は８μｍであり、帯電部材端部に接しているドラム
部分は帯電部材両端部の放電部分がドラム周方向に対し
横移動したので、放電集中が緩和され、そのためその部
位の削れ量は９．５μｍであり中央部とほとんど変わら
なかったので、初期と変わらない良好な画像が得られ、
耐久性が高いことがわかった。This charging member was attached to the position of the primary charger of the laser beam printer (laserjet 4si, manufactured by Hewlett Packard), and the DC voltage was -750.
V, AC voltage 2.0 KV (peak-to-peak voltage), frequency 65
Superimposed application at 0 Hz, high temperature and high humidity (32.5 ° C, 85
% RH) After measuring the amount of scraped drum after printing 10,000 sheets, the scraped amount at the center of the contact surface between the drum and the charging member is 8 μm, and the drum part in contact with the end of the charging member is charged. Since the discharge parts at both ends of the member moved laterally with respect to the drum circumferential direction, the discharge concentration was relieved. Therefore, the scraping amount at that part was 9.5 μm, which was almost the same as the center part, so it was a good initial condition. Image is obtained,
It was found to be highly durable.
【００９５】（実施例３） （弾性層用コンパウンドの調整）実施例１に同じであ
る。(Example 3) (Adjustment of compound for elastic layer) The same as Example 1.
【００９６】（被覆層用塗料の調整）実施例１に同じで
ある。(Preparation of coating material for coating layer) The same as in Example 1.
【００９７】（非画像領域塗装用塗料の調整）シリコー
ン樹脂１００重量部、トルエン３３５重量部を混合しシ
リコーン塗料を調整し、ＪＩＳ Ｋ６９１１に準じて、
体積固有抵抗を測定した。(Preparation of paint for non-image area coating) 100 parts by weight of a silicone resin and 335 parts by weight of toluene were mixed to prepare a silicone paint, and according to JIS K6911,
The volume resistivity was measured.
【００９８】（帯電部材の作成、評価）直径６ｍｍのス
テンレス製芯金にまず、上記弾性層用コンパウンドを１
５０℃で、１５分間加熱加硫させ、厚さ３ｍｍの弾性層
を有するゴムローラを得た。(Preparation and Evaluation of Charging Member) First, the above-mentioned elastic layer compound was applied to a stainless steel core bar having a diameter of 6 mm.
It was heated and vulcanized at 50 ° C. for 15 minutes to obtain a rubber roller having an elastic layer with a thickness of 3 mm.
【００９９】次にこのローラ２の両端部を４５°に面取
りし、被覆層用塗料で浸漬塗布した後、図３のように端
部から５ｍｍずつ前述の通り調整した非画像領域塗装用
塗料（シリコーン塗料、体積固有抵抗値１×１０6 Ω・
ｃｍ）と被覆用塗料との境界８が波型になるよう塗布し
た。この時、波型に塗布した部分の波高は３ｍｍで、波
長は４．７１ｍｍとし、両端部を周方向から見て、被覆
用塗料と絶縁塗料との境界８がローラ２を一周する間に
３ｍｍ横移動するようにした。Next, both ends of the roller 2 are chamfered at 45 °, and the coating material for the coating layer is applied by dipping, and then the coating material for non-image area coating ( Silicone paint, volume resistivity 1 × 10 6 Ω ・
(cm) and the coating 8 for coating were applied so as to have a wavy shape. At this time, the wave height of the corrugated portion was 3 mm, the wavelength was 4.71 mm, and when both ends were viewed from the circumferential direction, the boundary 8 between the coating paint and the insulating paint was 3 mm while the roller 2 made one round. I tried to move sideways.
【０１００】また、この帯電部材の抵抗値を前述の帯電
部材の電気抵抗値にしたがって測定したところ、両端部
非画像部領域の抵抗値が画像部領域の電気抵抗値１×１
０6Ωで、両端部非画像部領域の抵抗値は１×１０9 Ω
であり、非画像領域の抵抗値が画像領域部が１０００倍
で、かつ被覆用塗料と絶縁塗料との境界８がローラ２の
周方向から見て横移動する帯電部材を得た。When the resistance value of this charging member was measured according to the electric resistance value of the above-mentioned charging member, the resistance value of the non-image area of both ends was 1 × 1.
0 6 Ω, resistance value of non-image area at both ends is 1 × 10 9 Ω
A charging member was obtained in which the resistance value of the non-image area was 1000 times in the image area portion, and the boundary 8 between the coating material for coating and the insulating material was laterally moved when viewed from the circumferential direction of the roller 2.
【０１０１】この帯電部材をレーザービームプリンタ
（レーザージェット４ｓｉ ヒューレットパッカード
製）の一次帯電器位置に取り付け、直流電圧−７５０
Ｖ，交流電圧２．０ＫＶ（ピーク間電圧），周波数６５
０Ｈｚにて重畳印加し、高温、高湿（３２．５℃，８５
％ＲＨ）環境で１０，０００枚印字後のドラム削れ量を
測定したところドラムと帯電部材の当接面で中央部の削
れ量は８μｍであり、帯電部材非画像領域と画像領域の
界面付近に接しているドラム部分は帯電部材非画像領域
と画像領域の界面の放電部分がドラム周方向に対し横移
動したので、放電集中が緩和され、そのためその部位の
削れ量は８．５μｍであり中央部とほとんど変わらなか
ったので、初期と変わらない良好な画像が得られ、耐久
性が高いことがわかった。This charging member was attached to the position of the primary charger of a laser beam printer (laser jet 4si, manufactured by Hewlett Packard), and the DC voltage was -750.
V, AC voltage 2.0 KV (peak-to-peak voltage), frequency 65
Superimposed application at 0 Hz, high temperature and high humidity (32.5 ° C, 85
% RH) After measuring the amount of abrasion of the drum after printing 10,000 sheets, the amount of abrasion at the center of the contact surface between the drum and the charging member was 8 μm, and it was found near the interface between the charging member non-image area and the image area. In the contacting drum portion, the discharge portion at the interface between the non-image area of the charging member and the image area moved laterally with respect to the drum circumferential direction, so the discharge concentration was relieved. Therefore, the abrasion amount of that portion was 8.5 μm and the central portion It was found that a good image which is the same as the initial image was obtained and the durability was high.
【０１０２】（比較例１） （弾性層用コンパウンドの調整）実施例１に同じであ
る。Comparative Example 1 (Adjustment of Compound for Elastic Layer) Same as in Example 1.
【０１０３】（被覆層用塗料の調整）実施例１に同じで
ある。(Preparation of coating material for coating layer) The same as in Example 1.
【０１０４】（帯電部材の作成、評価）直径６ｍｍのス
テンレス製芯金にまず、上記弾性層用コンパウンドを１
５０℃で、１５分間加熱加硫させ、厚さ３ｍｍの弾性層
を有するゴムローラを得た。(Preparation and Evaluation of Charging Member) A stainless steel core having a diameter of 6 mm was first coated with the above compound for elastic layer 1
It was heated and vulcanized at 50 ° C. for 15 minutes to obtain a rubber roller having an elastic layer with a thickness of 3 mm.
【０１０５】次にこのローラ２の両端部を４５°に面取
りし、抵抗調整用塗料を浸漬塗布し、帯電部材を得た、
このときのローラ２の電気抵抗値は画像部、非画像部共
に１×１０6 Ωであった。Next, both ends of this roller 2 were chamfered at 45 ° and a resistance adjusting paint was applied by dipping to obtain a charging member.
At this time, the electric resistance value of the roller 2 was 1 × 10 6 Ω in both the image area and the non-image area.
【０１０６】この帯電部材をレーザービームプリンタ
（レーザージェット４ｓｉ ヒューレットパッカード
製）の一次帯電器位置に取り付け、直流電圧−７５０
Ｖ，交流電圧２．０ＫＶ（ピーク間電圧），周波数６５
０Ｈｚにて重畳印加し、高温、高湿（３２．５℃，８５
％ＲＨ）環境で１０，０００枚印字後のドラム削れ量を
測定したところドラムと帯電部材の当接面で中央部の削
れ量は８μｍであったが帯電部材端部に接しているドラ
ム部分は帯電部材両端部が絶縁もしくは放電集中緩和処
理がされていないことによる放電集中があり、そのため
１６μｍ削れており、その削れに起因する端部カブリの
ある画像となった。This charging member was attached to the position of the primary charger of the laser beam printer (laserjet 4si, manufactured by Hewlett Packard), and the DC voltage was -750.
V, AC voltage 2.0 KV (peak-to-peak voltage), frequency 65
Superimposed application at 0 Hz, high temperature and high humidity (32.5 ° C, 85
% RH) After measuring the amount of abrasion of the drum after printing 10,000 sheets, the contact surface between the drum and the charging member showed that the amount of abrasion at the center was 8 μm, but the drum portion in contact with the end of the charging member was There was discharge concentration due to neither insulation nor discharge concentration relaxation treatment on both ends of the charging member. Therefore, the image was abraded by 16 μm, and there was an edge fog due to the abrasion.
【０１０７】[0107]
【発明の効果】本発明は以上の構成および作用を有する
もので、帯電部材本体はローラ長手方向に移動せずに放
電領域が長手方向に移動するので、被帯電体に対する放
電の集中が緩和でき、従来のような被帯電体に局部的な
削れが発生する等の悪影響を与えることなはい。According to the present invention having the above-described structure and operation, since the discharge member moves in the longitudinal direction without moving the charging member main body in the roller longitudinal direction, the concentration of discharge on the body to be charged can be alleviated. However, there is no adverse effect such as local abrasion on the body to be charged as in the prior art.
【０１０８】ローラ面の端部がローラ面の動径によりロ
ーラ長手方向に移動することで、放電領域を移動しやす
くなる。The end portion of the roller surface moves in the roller longitudinal direction due to the radius of movement of the roller surface, which facilitates movement of the discharge region.
【０１０９】端部が、ローラ形状の端部が面取りされ、
ローラ面とこの面取り面との境界であること、または、
帯電部材本体の端部に電気抵抗値が高い高抵抗部を設
け、ローラ面とこの高抵抗部との境界とすることで、簡
単な構成となり、製造しやすい。The roller-shaped edge is chamfered,
Be the boundary between the roller surface and this chamfer, or
By providing a high resistance portion having a high electric resistance value at the end portion of the charging member main body and defining a boundary between the roller surface and this high resistance portion, the structure becomes simple and easy to manufacture.
【０１１０】ローラ面の電気抵抗値は１×１０4 〜１×
１０10Ωであり、高抵抗部の電気抵抗値はローラ面より
６倍以上高いことで、ローラ面および高抵抗部の電気抵
抗値のバランスが良く、良好な放電，帯電ができ、画像
品位の向上となる。The electric resistance value of the roller surface is 1 × 10 4 to 1 ×
It is 10 10 Ω, and the electric resistance value of the high resistance portion is 6 times or more higher than that of the roller surface, so that the electric resistance value of the roller surface and the high resistance portion is well balanced, good discharge and charging can be performed, and image quality It will be improved.
【０１１１】被帯電体に近接または接触するローラ面の
端部は、ローラ形状の周方向からみて波形であること
で、放電領域の移動が平均化され、被帯電体への負荷も
平均化できる。Since the end portion of the roller surface that is close to or in contact with the charged body is wavy when viewed from the circumferential direction of the roller shape, the movement of the discharge region is averaged and the load on the charged body can be averaged. .
【０１１２】波形は正弦波形であることで、さらに平均
化できる。Since the waveform is a sine waveform, it can be further averaged.
【図１】図１は本発明の帯電部材の一例を示す概略図で
ある。FIG. 1 is a schematic view showing an example of a charging member of the present invention.
【図２】図２は本発明の帯電部材の一例を示す概略図で
ある。FIG. 2 is a schematic view showing an example of a charging member of the present invention.
【図３】図３は本発明の帯電部材の一例を示す概略図で
ある。FIG. 3 is a schematic view showing an example of a charging member of the present invention.
【図４】図４は本発明の帯電部材両端部面取り部分を示
す概略図である。FIG. 4 is a schematic view showing chamfered portions at both ends of the charging member of the present invention.
１ 軸 ２ ローラ ３，８ 境界（端部） ４ ローラ面 ５ 面取り面 ６ 端部 ７ 高抵抗部 ９ 端面 １０ ローラ面４上の任意の点 １１ 端面面９上の任意の点 １２ 面取り面 1 axis 2 roller 3, 8 boundary (end) 4 roller surface 5 chamfered surface 6 end 7 high resistance part 9 end surface 10 arbitrary point on roller surface 4 11 arbitrary point on end surface 9 12 chamfered surface
Claims (8)
触し、被帯電体を帯電処理するローラ形状の帯電部材に
おいて、 この帯電部材本体はローラ長手方向に移動せずに放電領
域が長手方向に移動することを特徴とする帯電部材。1. A roller-shaped charging member for applying a voltage to approach or contact a member to be charged to charge the member to be charged, wherein the charging member main body does not move in the roller longitudinal direction and the discharge region is long. A charging member that moves in a direction.
の端部がローラ面の動径によりローラ長手方向に移動す
ることを特徴とする請求項１に記載の帯電部材。2. The charging member according to claim 1, wherein an end portion of the roller surface that is close to or in contact with the member to be charged moves in the roller longitudinal direction due to the radius of movement of the roller surface.
の端部は、ローラ形状の端部が面取りされ、ローラ面と
この面取り面との境界であることを特徴とする請求項２
に記載の帯電部材。3. A roller-shaped end is chamfered at the end of the roller surface that is close to or in contact with the member to be charged, and is a boundary between the roller surface and the chamfered surface.
The charging member according to 1.
の端部は、帯電部材本体の端部に電気抵抗値が高い高抵
抗部を設け、ローラ面とこの高抵抗部との境界であるこ
とを特徴とする請求項２に記載の帯電部材。4. A high resistance portion having a high electric resistance value is provided at the end of the roller surface that is close to or in contact with the body to be charged, and is a boundary between the roller surface and this high resistance portion. The charging member according to claim 2, wherein:
×１０10Ωであり、高抵抗部の電気抵抗値はローラ面よ
り６倍以上高いことを特徴とする請求項４に記載の帯電
部材。5. The electric resistance value of the roller surface is 1 × 10 4 to 1
The charging member according to claim 4, wherein the charging member has a resistance value of × 10 10 Ω, and the electric resistance value of the high resistance portion is 6 times or more higher than that of the roller surface.
の端部は、ローラ形状の周方向からみて波形であること
を特徴とする請求項２，３，４または５に記載の帯電部
材。6. The charging member according to claim 2, 3, 4, or 5, wherein an end portion of the roller surface that is close to or in contact with the member to be charged has a corrugated shape when viewed from the circumferential direction of the roller shape.
請求項６に記載の帯電部材。7. The charging member according to claim 6, wherein the waveform is a sine waveform.
帯電部材を備えた画像形成手段を有する画像形成装置。8. An image forming apparatus having an image forming means comprising the charging member according to claim 1. Description:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32978494A JP3200317B2 (en) | 1994-12-06 | 1994-12-06 | Charging member and image forming apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32978494A JP3200317B2 (en) | 1994-12-06 | 1994-12-06 | Charging member and image forming apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08160709A true JPH08160709A (en) | 1996-06-21 |
| JP3200317B2 JP3200317B2 (en) | 2001-08-20 |
Family
ID=18225231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32978494A Expired - Fee Related JP3200317B2 (en) | 1994-12-06 | 1994-12-06 | Charging member and image forming apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3200317B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0856778A2 (en) * | 1997-01-31 | 1998-08-05 | Seiko Epson Corporation | Image support apparatus and image unit using the same |
-
1994
- 1994-12-06 JP JP32978494A patent/JP3200317B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0856778A2 (en) * | 1997-01-31 | 1998-08-05 | Seiko Epson Corporation | Image support apparatus and image unit using the same |
| EP0856778A3 (en) * | 1997-01-31 | 1998-09-16 | Seiko Epson Corporation | Image support apparatus and image unit using the same |
| US6081680A (en) * | 1997-01-31 | 2000-06-27 | Seiko Epson Corporation | Image forming apparatus which prevents permanent deformation and excessive vibration of the image supporter and image formation unit using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3200317B2 (en) | 2001-08-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4702950B2 (en) | Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus, and method for manufacturing electrophotographic photosensitive member | |
| US5576805A (en) | Contact charging member for charging a photosensitive drum having improved durability and a method for making the same | |
| JPH02222985A (en) | Electrophotographic device | |
| JP2007219087A (en) | Electrifying device and image forming apparatus | |
| JP2009058789A (en) | Electrophotographic equipment, and process cartridge | |
| JP2003508811A (en) | Electrostatic fusing rolls and belts | |
| KR0171166B1 (en) | Charging member, process for producing charging member and process cartridge having the charging member | |
| JP3227333B2 (en) | Charging member and charging device | |
| JP5384042B2 (en) | Color image forming apparatus and color image forming method | |
| US5881343A (en) | Charging method and charging device | |
| JP3200317B2 (en) | Charging member and image forming apparatus | |
| JP3233527B2 (en) | Photoreceptor charging method and image forming method | |
| JP3243852B2 (en) | Conductive roll | |
| US10216114B2 (en) | Charging device and image forming apparatus | |
| JPH08185014A (en) | Electrifying member and image forming device provided with the same | |
| JP2008026480A (en) | Electrophotographic photoreceptor, process cartridge, and electrophotographic equipment | |
| EP1076269A2 (en) | Process cartridge and electrophotographic apparatus | |
| JP2000206779A (en) | Toner carrier and image forming device | |
| JP2002023485A (en) | Developing roller and developing device | |
| JPH07199599A (en) | Electrifying member and image forming device adopting the same | |
| JPH07261507A (en) | Electrifying member, electrifier, image forming device, and process cartridge | |
| JP2000137337A (en) | Image carrier and image forming device | |
| JP2008040242A (en) | Charging roll, process cartridge and image forming apparatus | |
| JP3511852B2 (en) | Development roll | |
| JPH08305051A (en) | Image carrier, process cartridge and image forming device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20010508 |
|
| LAPS | Cancellation because of no payment of annual fees |