JP2002139890A - Scorotron electrifier - Google Patents
Scorotron electrifierInfo
- Publication number
- JP2002139890A JP2002139890A JP2000337428A JP2000337428A JP2002139890A JP 2002139890 A JP2002139890 A JP 2002139890A JP 2000337428 A JP2000337428 A JP 2000337428A JP 2000337428 A JP2000337428 A JP 2000337428A JP 2002139890 A JP2002139890 A JP 2002139890A
- Authority
- JP
- Japan
- Prior art keywords
- grid electrode
- shield
- photoconductor
- opening
- 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.)
- Granted
Links
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電子写真法等を用
いる複写機、プリンタ、ファクシミリ等の画像形成装置
において、感光体表面を一様に帯電させるためのスコロ
トロン帯電装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scorotron charging device for uniformly charging the surface of a photoreceptor in an image forming apparatus such as a copying machine, a printer, a facsimile or the like using an electrophotographic method or the like.
【０００２】[0002]
【従来の技術】図２は、本発明が適用されるスコロトロ
ン帯電装置を示し、図２（Ａ）は断面図、図２（Ｂ）は
図２（Ａ）のＢ−Ｂ線に沿う断面図、図２（Ｃ）はグリ
ッド電極の平面図である。2. Description of the Related Art FIG. 2 shows a scorotron charging device to which the present invention is applied. FIG. 2 (A) is a sectional view, and FIG. 2 (B) is a sectional view taken along line BB of FIG. 2 (A). FIG. 2C is a plan view of the grid electrode.
【０００３】図２（Ａ）および図２（Ｂ）に示すよう
に、導電性材料で構成された略コ字状断面のシールド１
と、このシールド１内に張設されたコロナ放電用ワイヤ
電極２と、シールド１の開口部に感光体４と所定の間隔
をもって配設されたグリッド電極３を備えている。グリ
ッド電極３には、図２（Ｃ）に示すように、感光体４の
移動方向に対して角度を有して多数の開口５がグリッド
電極３の長手方向に並べられて形成されている。そし
て、シールド１とワイヤ電極２の間に数ｋＶの直流高電
圧を印加し、グリッド電極３に数１００Ｖの高電圧を印
加する。As shown in FIGS. 2A and 2B, a shield 1 having a substantially U-shaped cross section made of a conductive material is used.
And a wire electrode 2 for corona discharge stretched inside the shield 1, and a grid electrode 3 arranged at a predetermined distance from the photoconductor 4 in an opening of the shield 1. As shown in FIG. 2C, a large number of openings 5 are formed in the grid electrode 3 at an angle with respect to the moving direction of the photoconductor 4 so as to be arranged in the longitudinal direction of the grid electrode 3. Then, a high DC voltage of several kV is applied between the shield 1 and the wire electrode 2, and a high voltage of several hundred V is applied to the grid electrode 3.
【０００４】これにより、ワイヤ電極１からグリッド電
極３の開口５を通って感光体４表面に向かってイオンが
放射され光導電層への帯電が行われる。感光体４の表面
に過剰帯電する部分が発生しても、感光体４表面に存在
する過剰イオンはグリッド電極３に吸収され、グリッド
電極３に印加された高電圧へ均一に帯電することができ
る。[0004] As a result, ions are emitted from the wire electrode 1 through the opening 5 of the grid electrode 3 toward the surface of the photoreceptor 4 to charge the photoconductive layer. Even if an excessively charged portion occurs on the surface of the photoreceptor 4, excess ions existing on the surface of the photoreceptor 4 are absorbed by the grid electrode 3 and can be uniformly charged to a high voltage applied to the grid electrode 3. .
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記従
来のスコロトロン帯電装置においては、ワイヤ電極１か
ら放射されたイオンは、グリッド電極３の開口５を通っ
た状態では、図３（Ａ）に示すように、グリッド電極３
と感光層４ａ間で形成される等電位線が滑らかな分布を
有し、その結果、感光体４表面を帯電させるために使用
される単位時間当たりのイオン流量が少なく、感光体４
表面を所望の電位にまで帯電させるために時間がかかる
という問題を有し、とくに、画像形成装置の高速化に伴
い感光体４を高速回転させた場合には、図３（Ｂ）に示
すように、ワイヤ電極２のコロナ点（放電点）２ａから
放射され、感光体４に帯電された帯電斑（ハッチング
部）６間に隙間が生じてしまい、均一な帯電ができない
という問題を有している。However, in the above-described conventional scorotron charging device, ions emitted from the wire electrode 1 pass through the opening 5 of the grid electrode 3 as shown in FIG. And grid electrode 3
The equipotential lines formed between the photoconductor 4a and the photoconductor 4a have a smooth distribution. As a result, the ion flow per unit time used for charging the surface of the photoconductor 4 is small,
There is a problem that it takes time to charge the surface to a desired potential. In particular, when the photoconductor 4 is rotated at a high speed with an increase in the speed of the image forming apparatus, as shown in FIG. In addition, there is a problem that a gap is formed between the charged spots (hatched portions) 6 radiated from the corona point (discharge point) 2a of the wire electrode 2 and charged on the photoreceptor 4, and uniform charging cannot be performed. I have.
【０００６】本発明は、上記従来の問題を解決するもの
であって、感光体の表面電位を設定値どおりに、均一か
つ高速に帯電させることができる帯電装置を提供するこ
とを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a charging device capable of uniformly and rapidly charging a surface potential of a photosensitive member according to a set value.
【０００７】[0007]
【課題を解決するための手段】そのために本発明のスコ
ロトロン帯電装置は、シールドと、該シールド内に張設
されたワイヤ電極と、シールドの開口部に感光体と所定
の間隔をもって配設されたグリッド電極と、該グリッド
電極に形成された多数の開口とを備え、前記開口の感光
体側の周縁に突起部を形成したことを特徴とする。For this purpose, a scorotron charging device according to the present invention is provided with a shield, a wire electrode stretched in the shield, and a predetermined distance from a photosensitive member in an opening of the shield. A grid electrode and a plurality of openings formed in the grid electrode are provided, and a projection is formed on the periphery of the opening on the photoconductor side.
【０００８】[0008]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照しつつ説明する。図１は、本発明のスコロトロン
帯電装置の１実施形態を示し、図１（Ａ）はグリッド電
極の一部断面図、図１（Ｂ）は作用を説明するための図
である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows one embodiment of the scorotron charging device of the present invention, FIG. 1 (A) is a partial cross-sectional view of a grid electrode, and FIG. 1 (B) is a diagram for explaining the operation.
【０００９】本発明のスコロトロン帯電装置は、図２
（Ａ）および図２（Ｂ）で説明したように、導電性材料
で構成された略コ字状断面のシールド１と、このシール
ド１内に張設されたコロナ放電用ワイヤ電極２と、シー
ルド１の開口部に感光体４と所定の間隔をもって配設さ
れたグリッド電極３を備えている。グリッド電極３に
は、図２（Ｃ）に示すように、感光体４の移動方向に対
して角度を有して多数の開口５がグリッド電極３の長手
方向に並べられて形成されている。そして、シールド１
とワイヤ電極２の間に数ｋＶの直流高電圧を印加し、グ
リッド電極３に数１００Ｖの高電圧を印加する。The scorotron charging device of the present invention is shown in FIG.
As described with reference to FIGS. 2A and 2B, a shield 1 having a substantially U-shaped cross section made of a conductive material, a corona discharge wire electrode 2 stretched inside the shield 1, and a shield A grid electrode 3 is provided at one opening with a predetermined distance from the photoconductor 4. As shown in FIG. 2C, a large number of openings 5 are formed in the grid electrode 3 at an angle with respect to the moving direction of the photoconductor 4 so as to be arranged in the longitudinal direction of the grid electrode 3. And shield 1
And a high voltage of several hundred volts is applied to the grid electrode 3.
【００１０】本発明の特徴とする点は、図１（Ａ）に示
すように、グリッド電極３の開口５の感光体４側の周縁
に突起部７を形成した点である。図中、点線は等電位
線、４ａは感光層、４ｂは感光層担持体を示し、感光層
担持体４ｂは接地されている。A feature of the present invention is that, as shown in FIG. 1A, a protrusion 7 is formed on the periphery of the opening 5 of the grid electrode 3 on the photoconductor 4 side. In the figure, dotted lines indicate equipotential lines, 4a indicates a photosensitive layer, 4b indicates a photosensitive layer carrier, and the photosensitive layer carrier 4b is grounded.
【００１１】上記構成からなる本発明のスコロトロン帯
電装置の作用について説明する。ワイヤ電極１からグリ
ッド電極３の開口５を通って感光体４表面に向かってイ
オンが放射され光導電層４ａへの帯電が行われる。感光
体４の表面に過剰帯電する部分が発生しても、感光体４
表面に存在する過剰イオンはグリッド電極３に吸収さ
れ、グリッド電極３に印加された高電圧へ均一に帯電す
ることができる。The operation of the scorotron charging device of the present invention having the above configuration will be described. Ions are emitted from the wire electrode 1 through the opening 5 of the grid electrode 3 toward the surface of the photoconductor 4, and the photoconductive layer 4a is charged. Even if an excessively charged portion occurs on the surface of the photoconductor 4,
Excess ions existing on the surface are absorbed by the grid electrode 3 and can be uniformly charged to a high voltage applied to the grid electrode 3.
【００１２】本発明においては、グリッド電極３の開口
５の感光体４側の周縁に突起部７を形成しているため、
ワイヤ電極１から放射されたイオンは、グリッド電極３
の開口５を通った状態では、図１（Ａ）の等電位線で示
すように、開口５付近で電界強度が増大し、その結果、
開口５をイオンが通過し易くなり、感光体４表面を帯電
させるために使用される単位時間当たりのイオン流量が
増大し、感光体４表面を所望の電位にまで短時間で帯電
させることができる。In the present invention, since the projection 7 is formed on the periphery of the opening 5 of the grid electrode 3 on the photoconductor 4 side,
The ions emitted from the wire electrode 1
1A, the electric field intensity increases near the opening 5 as shown by the equipotential lines in FIG.
The ions easily pass through the opening 5, the ion flow per unit time used for charging the surface of the photoconductor 4 increases, and the surface of the photoconductor 4 can be charged to a desired potential in a short time. .
【００１３】従って、感光体４を高速回転させた場合で
も、図１（Ｂ）に示すように、ワイヤ電極２のコロナ点
（放電点）２ａから放射され、感光体４に帯電された帯
電斑（ハッチング部）６間の隙間が埋められ（図３
（Ｂ）と比較して）、均一な帯電を行うことができ、感
光体の表面電位を設定値どおりに、均一かつ高速に帯電
させることができる。Therefore, even when the photosensitive member 4 is rotated at high speed, as shown in FIG. 1B, the charged spots radiated from the corona point (discharge point) 2a of the wire electrode 2 and charged on the photosensitive member 4 The gap between the (hatched portions) 6 is filled (FIG. 3
(Compared with (B)), uniform charging can be performed, and the surface potential of the photoreceptor can be charged uniformly and at high speed according to the set value.
【００１４】[0014]
【発明の効果】以上の説明から明らかなように、本発明
によれば、シールドと、該シールド内に張設されたワイ
ヤ電極と、シールドの開口部に感光体と所定の間隔をも
って配設されたグリッド電極と、該グリッド電極に形成
された多数の開口とを備え、前記開口の感光体側の周縁
に突起部を形成したので、感光体の表面電位を設定値ど
おりに、均一かつ高速に帯電させることができる。As is apparent from the above description, according to the present invention, the shield, the wire electrode stretched inside the shield, and the photoconductor are provided at a predetermined distance from the photosensitive member in the opening of the shield. Grid electrode and a number of openings formed in the grid electrode, and a projection is formed on the periphery of the opening on the photoconductor side, so that the surface potential of the photoconductor is charged uniformly and at high speed according to a set value. Can be done.
【図１】本発明のスコロトロン帯電装置の１実施形態を
示し、図１（Ａ）はグリッド電極の一部断面図、図１
（Ｂ）は作用を説明するための図である。1 shows an embodiment of a scorotron charging device of the present invention, and FIG. 1 (A) is a partial cross-sectional view of a grid electrode, FIG.
(B) is a diagram for explaining the operation.
【図２】本発明が適用されるスコロトロン帯電装置を示
し、図２（Ａ）は断面図、図２（Ｂ）は図２（Ａ）のＢ
−Ｂ線に沿う断面図、図２（Ｃ）はグリッド電極の平面
図である。2A and 2B show a scorotron charging device to which the present invention is applied. FIG. 2A is a cross-sectional view, and FIG.
FIG. 2C is a cross-sectional view taken along the line B, and FIG. 2C is a plan view of the grid electrode.
【図３】本発明の課題を説明するための図である。FIG. 3 is a diagram for explaining a problem of the present invention.
１…シールド ２…ワイヤ電極 ３…グリッド電極 ４…感光体 ５…開口 ７…突起部 DESCRIPTION OF SYMBOLS 1 ... Shield 2 ... Wire electrode 3 ... Grid electrode 4 ... Photoconductor 5 ... Opening 7 ... Projection
───────────────────────────────────────────────────── フロントページの続き (72)発明者 三輪 浩之 長野県諏訪市大和３丁目３番５号 セイコ ーエプソン株式会社内 Ｆターム(参考） 2H003 BB11 CC01 DD01 EE01 EE03 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroyuki Miwa 3-3-5 Yamato, Suwa-shi, Nagano F-term in Seiko Epson Corporation (reference) 2H003 BB11 CC01 DD01 EE01 EE03
Claims (1)
イヤ電極と、シールドの開口部に感光体と所定の間隔を
もって配設されたグリッド電極と、該グリッド電極に形
成された多数の開口とを備え、前記開口の感光体側の周
縁に突起部を形成したことを特徴とするスコロトロン帯
電装置。1. A shield, a wire electrode stretched in the shield, a grid electrode disposed at a predetermined distance from a photosensitive member in an opening of the shield, and a plurality of openings formed in the grid electrode. Wherein a projection is formed on the periphery of the opening on the photoconductor side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000337428A JP3690497B2 (en) | 2000-11-06 | 2000-11-06 | Scorotron charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000337428A JP3690497B2 (en) | 2000-11-06 | 2000-11-06 | Scorotron charger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002139890A true JP2002139890A (en) | 2002-05-17 |
| JP3690497B2 JP3690497B2 (en) | 2005-08-31 |
Family
ID=18812810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000337428A Expired - Fee Related JP3690497B2 (en) | 2000-11-06 | 2000-11-06 | Scorotron charger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3690497B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013225060A (en) * | 2012-04-23 | 2013-10-31 | Fuji Xerox Co Ltd | Grid electrode, charging device, and image forming apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20230171196A (en) * | 2022-06-13 | 2023-12-20 | 경희대학교 산학협력단 | Batteryless Electronic stimulating unit and manufacturing method thereof |
-
2000
- 2000-11-06 JP JP2000337428A patent/JP3690497B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013225060A (en) * | 2012-04-23 | 2013-10-31 | Fuji Xerox Co Ltd | Grid electrode, charging device, and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3690497B2 (en) | 2005-08-31 |
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