JP2527441B2 - Photoconductor charging device - Google Patents
Photoconductor charging deviceInfo
- Publication number
- JP2527441B2 JP2527441B2 JP22238587A JP22238587A JP2527441B2 JP 2527441 B2 JP2527441 B2 JP 2527441B2 JP 22238587 A JP22238587 A JP 22238587A JP 22238587 A JP22238587 A JP 22238587A JP 2527441 B2 JP2527441 B2 JP 2527441B2
- Authority
- JP
- Japan
- Prior art keywords
- photoconductor
- corona discharger
- photosensitive drum
- charging device
- drum
- 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.)
- Expired - Lifetime
Links
Landscapes
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Description
【発明の詳細な説明】 （イ） 産業上の利用分野 この発明は、感光体とコロナ放電器との間にグリッド
電極を介在させた、いわゆるスコロトロン帯電装置に関
し、例えば静電転写型複写機やレーザプリンタ等に利用
される。The present invention relates to a so-called scorotron charging device in which a grid electrode is interposed between a photoconductor and a corona discharger, such as an electrostatic transfer copying machine or Used in laser printers.
（ロ） 従来の技術 従来この種の帯電装置は、感光体表面に安定した帯電
を施すことができるため、一般によく利用されるように
なってきているが、感光体の表面電位はコロナ放電器の
ワヤイ電極−グリッド電極間の電界強度とワイヤ電極−
感光体間の電界強度との分配比によって決定され、感光
体−グリッド電極間距離及び感光体−ワイヤ電極間距離
によって大きく左右される。従って、これらの位置関係
を精度良く維持するためにコロナ放電器及びグリッド電
極にそれぞれコマ（車輪）を設け、そのコマによって感
光体ドラム上をならわせるようにしたもの（例えば、特
開昭59-142571号公報参照）や、感光体ドラムを回転可
能に支持する支持部材にグリッド電極を支持したもの
（例えば、実開昭58-168743号公報参照）等がみられ
る。(B) Conventional technology Conventionally, this type of charging device has been widely used because it can stably charge the surface of the photoconductor, but the surface potential of the photoconductor is a corona discharger. Electric field strength between wire electrode and wire electrode and wire electrode
It is determined by the distribution ratio with the electric field strength between the photoconductors, and is largely influenced by the distance between the photoconductor-grid electrode and the distance between the photoconductor-wire electrode. Therefore, in order to maintain these positional relationships with high accuracy, a frame (wheel) is provided on each of the corona discharger and the grid electrode so that the photosensitive drum can be aligned by the frame (see, for example, JP-A-59-59). -142571), and a support member that rotatably supports the photosensitive drum and a grid electrode is supported (for example, see Japanese Utility Model Laid-Open No. 58-168743).
（ハ） 発明が解決しようとする問題点 ところで、感光体ドラムおよびコロナ放電器は、清掃
や交換等のメンテナンス作業の点から、着脱が容易なカ
ートリッジ方式に構成されることがある。しかしなが
ら、前記従来例の前者においては、その構造上、グリッ
ドを薄くすることに限度があり、従ってグリッドのパタ
ーンが粗くなり、グリッドの効率が落ちる。後者におい
ては、グリッド電極と感光体ドラムとの位置関係は保持
されるもののコロナ放電器が感光体ドラムから分離して
設置されるためその両者の位置関係が精度良く保持され
ないという問題点がある。更に、感光体及びコロナ放電
器はそれぞれ接地される必要があるが、従来は、各々独
立した電極を介して設置するようにしているため、感光
体ドラムやコロナ放電器を着脱した場合には、各々の電
気的接続が必要であるという問題点があった。(C) Problems to be Solved by the Invention By the way, the photosensitive drum and the corona discharger may be configured as a cartridge system that is easily removable from the viewpoint of maintenance work such as cleaning and replacement. However, in the former case of the above-mentioned conventional example, there is a limit to the thickness of the grid due to its structure, so that the grid pattern becomes rough and the grid efficiency decreases. In the latter case, the positional relationship between the grid electrode and the photoconductor drum is maintained, but the corona discharger is installed separately from the photoconductor drum, so that the positional relationship between the two is not accurately maintained. Further, the photoconductor and the corona discharger need to be grounded, respectively, but conventionally, since they are installed via independent electrodes, when the photoconductor drum or the corona discharger is attached or detached, There is a problem that each electrical connection is required.
この発明は、このような事情を考慮してなされたもの
で、感光体ドラムを回転可能に支持する支持部材にコロ
ナ放電器及びグリッド電極を一体に支持してそれぞれの
感光体ドラムに対する間隔を精度良く保持すると共に、
コロナ放電器と感光体との設置接続を単純化した感光体
帯電装置を提供するものである。The present invention has been made in consideration of such circumstances, and a corona discharger and a grid electrode are integrally supported by a supporting member that rotatably supports the photoconductor drums so that the distances between the photoconductor drums can be accurately adjusted. Hold well,
Provided is a photoconductor charging device in which installation and connection of a corona discharger and a photoconductor are simplified.
（ニ） 問題点を解決するための手段 この発明は、回転可能に設置された感光体ドラムの外
周面にグリッド電極を介在させてコロナ放電器を配置し
感光体を帯電させるよう構成した感光体帯電装置におい
て、軸孔を有し絶縁材からなるフランジを両端に装着し
た感光体ドラムと、前記軸孔に同軸に両外部から挿入固
着された第１および第２回転軸と、感光体ドラムの両端
外方にベース板上に立設され第１及び第２回転軸をそれ
ぞれベアリングを介して回転可能に支持する第１及び第
２支持板とを備え、コロナ放電器とグリッド電極とが第
１及び第２支持板間に支持固定されて感光体ドラムに対
してそれぞれ所定間隔を保持し、かつ、第１回転軸及び
第１支持板が導電材からなり、コロナ放電器のシールド
電極が第１支持板に、感光体がドラム内部で第１回転軸
に、それぞれ電気的に接続され、前記シールド電極と前
記感光体が共に第１回転軸を介して接地可能であること
を特徴とする感光体帯電装置である。(D) Means for Solving the Problems The present invention is directed to a photoreceptor configured to charge a photoreceptor by disposing a corona discharger with a grid electrode on the outer peripheral surface of a rotatably provided photoreceptor drum. In the charging device, a photosensitive drum having shaft holes and flanges made of an insulating material mounted on both ends, first and second rotary shafts coaxially inserted into and fixed to the shaft holes from both outsides, and a photosensitive drum First and second support plates that are erected on both sides outwardly on the base plate and rotatably support the first and second rotating shafts through bearings, respectively, and the corona discharger and the grid electrode are the first. And a second supporting plate supported and fixed between the second supporting plate and the second supporting plate so as to maintain a predetermined distance from the photosensitive drum, and the first rotating shaft and the first supporting plate are made of a conductive material. The photoconductor drums on the support plate. The first rotary shaft in parts, are electrically connected, a photoreceptor charging device, wherein the photosensitive member and the shield electrode can be both grounded via a first rotary shaft.
（ホ） 作用 コロナ放電器とグリッド電極とが第１及び第２支持板
間に支持固定されるため、感光体ドラムに対してそれぞ
れ所定間隔を保持することができると共に、コロナ放電
器のシールド電極と感光体とがそれぞれ第１回転軸に電
気的に接続されているので、第１回転軸を接地すればコ
ロナ放電器及び感光体が同時に接地されることになる。(E) Action Since the corona discharger and the grid electrode are supported and fixed between the first and second support plates, it is possible to maintain a predetermined distance with respect to the photosensitive drum and the shield electrode of the corona discharger. Since the photoconductor and the photoconductor are electrically connected to the first rotary shaft, the corona discharger and the photoconductor are simultaneously grounded if the first rotary shaft is grounded.
（ヘ） 実施例 以下、図面に示す実施例に基づいてこの発明を詳述す
る。これによって、この発明が限定されるものではな
い。(F) Examples Hereinafter, the present invention will be described in detail based on the examples shown in the drawings. This does not limit the present invention.
第１図はこの発明の一実施例を示す縦断面図であり、
１は筒状の感光体、2a,2bはそれぞれに軸孔を有して感
光体ドラム１の両端に装着された絶縁材からなるフラン
ジ、3a,3bはそれぞれフランジ2a,2bの軸孔に挿着された
ブッシング、4a,4bに嵌入固着された回転軸、5a,5bは感
光体ドラム１の両端外方にベース板７上に立設され回転
軸3a,3bをベアリング6a,6bを介して回転可能にそれぞれ
支持する支持板、８はシールド電極９及びワイヤ電極10
からなり感光体ドラム１に対して所定間隔を有するよう
支持板5a,5bに固定されたコロナ放電器、11はコロナ放
電器８と感光体ドラム１の間に所定の間隔を有して介在
するよう支持板5a,5bに支持されたグリッド電極、12は
回転軸3aの端部に装着され感光体ドラム１を回転させる
駆動用のギヤ、13は感光体ドラム１の感光体と回転軸3a
を電気的に接続する接触子である。なお、支持板5aは金
属板からなりシールド電極９の端部が接触してシールド
電極９と支持板5aとが電気的に接続されている。FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention,
Reference numeral 1 is a cylindrical photosensitive member, 2a and 2b are flanges made of an insulating material attached to both ends of the photosensitive drum 1 with shaft holes respectively, and 3a and 3b are respectively inserted into the shaft holes of the flanges 2a and 2b. Wearing bushings, rotary shafts fitted and fixed to 4a, 4b, 5a, 5b are erected on the base plate 7 outside both ends of the photosensitive drum 1, and rotary shafts 3a, 3b are mounted via bearings 6a, 6b. A support plate that rotatably supports each, and 8 is a shield electrode 9 and a wire electrode 10.
The corona discharger 11 is fixed to the support plates 5a and 5b so as to have a predetermined distance from the photosensitive drum 1, and 11 is interposed between the corona discharger 8 and the photosensitive drum 1 with a predetermined distance. Grid electrodes supported by the support plates 5a and 5b, 12 is a drive gear which is attached to the end of the rotating shaft 3a and rotates the photosensitive drum 1, and 13 is a photosensitive member of the photosensitive drum 1 and the rotating shaft 3a.
Is a contactor for electrically connecting the. The support plate 5a is made of a metal plate, and an end portion of the shield electrode 9 is in contact with the support plate 5a to electrically connect the shield electrode 9 and the support plate 5a.
このような構成によれば、コロナ放電器８、及びグリ
ッド電極11は支持板5a,5bによって支持され各々の感光
体ドラム１の表面に対する間隔が精度良く保たれる。ま
たコロナ放電器８のシールド電極９は支持板5a及びベア
リング6aを介して回転軸3aに電気的に接続されると共
に、感光体ドラム１も接触し13を介して回転軸3aに電気
的接続されるため、回転軸3aのみを接地すればコロナ放
電器８及び感光体ドラム１が同時に設置されることにな
り、両者の設置接続が非常に簡単になる。更に、ベース
板７によって感光体ドラム１、コロナ放電器８、グリッ
ド電極11がそれぞれ１つのユニットとして構成されるた
めカートリッジ化が容易になると共に、ベース板７に、
例えばガイド溝を設けることにより複写機本体への着脱
が容易になる。また、支持板5b及び回転軸3bを導電材で
構成しグリッド電極11への外部からの電気的接続を回転
軸3b、ベアリング6b、支持板5bを介して行うようにして
もよい。With such a configuration, the corona discharger 8 and the grid electrode 11 are supported by the support plates 5a and 5b, and the distances between the surfaces of the respective photosensitive drums 1 are accurately maintained. Further, the shield electrode 9 of the corona discharger 8 is electrically connected to the rotating shaft 3a via the support plate 5a and the bearing 6a, and also contacts the photosensitive drum 1 to be electrically connected to the rotating shaft 3a via 13. Therefore, if only the rotating shaft 3a is grounded, the corona discharger 8 and the photosensitive drum 1 are installed at the same time, and the installation and connection of both are very simple. Furthermore, since the photoconductor drum 1, the corona discharger 8 and the grid electrode 11 are each configured as one unit by the base plate 7, it becomes easy to form a cartridge, and the base plate 7 is
For example, by providing a guide groove, attachment / detachment to / from the copying machine main body becomes easy. Alternatively, the support plate 5b and the rotary shaft 3b may be made of a conductive material, and the grid electrode 11 may be electrically connected from the outside via the rotary shaft 3b, the bearing 6b, and the support plate 5b.
（ト） 発明の効果 この発明によれば、感光体ドラム、コロナ放電器、グ
リッド電極の相互間の位置関係が、簡単な構成によって
精度良く維持されるため、放電装置の組み立て作業及び
調製作業が簡略化され作製時の工数が低減されるととも
に、放電装置の性能及び品質が向上すると共に、ユニッ
ト化やカートリッジ化が容易となりそれによってメンテ
ナンス作業の簡略化が可能となる。(G) Effect of the Invention According to the present invention, the positional relationship among the photoconductor drum, the corona discharger, and the grid electrode can be maintained accurately with a simple configuration. This simplifies and reduces man-hours at the time of manufacture, improves the performance and quality of the discharge device, and facilitates unitization and cartridge formation, thereby simplifying maintenance work.
【図面の簡単な説明】 第１図はこの発明の一実施例を示す縦断面図である。 １……感光体ドラム、2a,2b……フランジ、3a,3b……回
転軸、4a,4b……ブッシング、5a,5b……支持板、6a,6b
……ベアリング、７……ベース板、８……コロナ放電
器、９……シールド電極、10……ワイヤ電極、11……グ
リッド電極、12……ギヤ。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical sectional view showing an embodiment of the present invention. 1 ... Photosensitive drum, 2a, 2b ... Flange, 3a, 3b ... Rotating shaft, 4a, 4b ... Bushing, 5a, 5b ... Support plate, 6a, 6b
...... Bearing, 7 ... Base plate, 8 ... Corona discharger, 9 ... Shield electrode, 10 ... Wire electrode, 11 ... Grid electrode, 12 ... Gear.
Claims (1)
面にグリッド電極を介在させてコロナ放電器を配置し感
光体を帯電させるよう構成した感光体帯電装置におい
て、軸孔を有し絶縁材からなるフランジを両端に装着し
た感光体ドラムと、前記軸孔に同軸に両外部から挿入固
着された第１および第２回転軸と、感光体ドラムの両端
外方にベース板上に立設され第１及び第２回転軸をそれ
ぞれベアリングを介して回転可能に支持する第１及び第
２支持板とを備え、コロナ放電器とグリッド電極とが第
１及び第２支持板間に支持固定されて感光体ドラムに対
してそれぞれ所定間隔を保持し、かつ、第１回転軸及び
第１支持板が導電材からなり、コロナ放電器のシールド
電極が第１支持板に、感光体がドラム内部で第１回転軸
に、それぞれ電気的に接続され、前記シールド電極と前
記感光体が共に第１回転軸を介して接地可能であること
を特徴とする感光体帯電装置。1. A photoconductor charging device configured to charge a photoconductor by arranging a corona discharger with a grid electrode interposed on the outer peripheral surface of a rotatably installed photoconductor drum. A photosensitive drum having flanges made of material mounted on both ends, first and second rotating shafts coaxially inserted and fixed to both sides of the shaft hole from both outsides, and erected on both sides of the photosensitive drum on a base plate. A corona discharger and a grid electrode are supported and fixed between the first and second support plates. The first rotating shaft and the first supporting plate are made of a conductive material, the shield electrode of the corona discharger is the first supporting plate, and the photosensitive member is inside the drum. Each of the first rotating shaft is electrically connected Connected, a photoreceptor charging device, wherein the shield electrode and the photoreceptor can be both grounded via a first rotary shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22238587A JP2527441B2 (en) | 1987-09-04 | 1987-09-04 | Photoconductor charging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22238587A JP2527441B2 (en) | 1987-09-04 | 1987-09-04 | Photoconductor charging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6465573A JPS6465573A (en) | 1989-03-10 |
| JP2527441B2 true JP2527441B2 (en) | 1996-08-21 |
Family
ID=16781530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22238587A Expired - Lifetime JP2527441B2 (en) | 1987-09-04 | 1987-09-04 | Photoconductor charging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2527441B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2758534B2 (en) * | 1992-07-13 | 1998-05-28 | 三田工業株式会社 | Image carrier support structure |
| JP5768630B2 (en) | 2011-09-28 | 2015-08-26 | 富士ゼロックス株式会社 | Image forming apparatus |
-
1987
- 1987-09-04 JP JP22238587A patent/JP2527441B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6465573A (en) | 1989-03-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term | ||
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