JPH04309973A - Contact electrostatic charging device - Google Patents
Contact electrostatic charging deviceInfo
- Publication number
- JPH04309973A JPH04309973A JP7528791A JP7528791A JPH04309973A JP H04309973 A JPH04309973 A JP H04309973A JP 7528791 A JP7528791 A JP 7528791A JP 7528791 A JP7528791 A JP 7528791A JP H04309973 A JPH04309973 A JP H04309973A
- Authority
- JP
- Japan
- Prior art keywords
- blade
- photoreceptor
- dust
- contact
- 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.)
- Pending
Links
- 238000007786 electrostatic charging Methods 0.000 title 1
- 108091008695 photoreceptors Proteins 0.000 claims description 34
- 239000000428 dust Substances 0.000 abstract description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 229920006311 Urethane elastomer Polymers 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 229920002379 silicone rubber Polymers 0.000 abstract description 2
- 239000004945 silicone rubber Substances 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract 1
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 230000000717 retained effect Effects 0.000 abstract 1
- 230000006866 deterioration Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/02—Arrangements for laying down a uniform charge
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明はレーザプリンタなどの
電子写真法を用いて画像形成を行う装置において感光体
表面に電荷を注入する帯電装置に関し、特に感光体表面
に当接する当接部材から感光体に直流電圧を印加するよ
うにした接触帯電装置に関する。[Field of Industrial Application] This invention relates to a charging device that injects charges onto the surface of a photoreceptor in an image forming apparatus using electrophotography such as a laser printer, and more particularly, the present invention relates to a charging device that injects charges onto the surface of a photoreceptor in an image forming apparatus using electrophotography such as a laser printer. The present invention relates to a contact charging device that applies a DC voltage to a body.
【０００２】0002
【従来の技術】電子写真法を用いて画像形成を行うに際
し、感光体表面を所定の表面電位に帯電させるためにワ
イヤ電極からのコロナ放電が広く用いられている。とこ
ろが、このようなコロナ放電ではワイヤ電極に印加する
電圧に対して感光体表面における帯電効率が低く、感光
体を所定の電位に帯電させるためにはワイヤ電極に過大
な電圧を印加する必要があり、大きな電源装置を備えな
ければならない。また、コロナ放電によってオゾンが発
生し、画像の形成状態を劣化させるばかりでなく、人体
に対する悪影響も大きな問題となる。そこで、特開昭５
８−１２１０６３号公報および特開平１−９３７６０号
公報に開示されているように感光体表面に当接するブラ
シやブレード等の導電性の当接部材を備え、この当接部
材から感光体表面に対して直流電圧を直接印加するよう
にした装置が提案されている。このように、感光体表面
に当接する当接部材から直接的に電圧を印加することに
より、感光体表面における帯電効率を向上させて電源装
置を小型化できるとともに、気中放電によるコロナの発
生を防止して画像の劣化や人体への悪影響を未然に防ぐ
ことができる。2. Description of the Related Art When forming images using electrophotography, corona discharge from a wire electrode is widely used to charge the surface of a photoreceptor to a predetermined surface potential. However, in this type of corona discharge, the charging efficiency on the surface of the photoreceptor is low relative to the voltage applied to the wire electrode, and in order to charge the photoreceptor to a predetermined potential, it is necessary to apply an excessive voltage to the wire electrode. , must be equipped with a large power supply. Further, ozone is generated by corona discharge, which not only deteriorates the image formation state but also poses a serious problem of adverse effects on the human body. Therefore,
As disclosed in Japanese Patent Publication No. 8-121063 and Japanese Patent Application Laid-open No. 1-93760, a conductive contact member such as a brush or blade that contacts the surface of the photoreceptor is provided, and the contact member is provided with a conductive contact member such as a brush or a blade that contacts the surface of the photoreceptor. A device that directly applies a DC voltage has been proposed. In this way, by applying voltage directly from the contact member that contacts the photoreceptor surface, the charging efficiency on the photoreceptor surface can be improved and the power supply device can be made smaller, and the generation of corona due to air discharge can be reduced. This can prevent image deterioration and adverse effects on the human body.
【０００３】0003
【発明が解決しようとする課題】しかしながら、感光体
表面には紙粉等の塵埃や現像剤が付着し易く、このよう
な塵埃等が感光体表面と当接部材との間に滞留すると、
感光体表面と当接部材との接触状態が部分的に損なわれ
、その部分において帯電効率の劣化を招き、感光体表面
における帯電状態が不均一になって画像の劣化を招く問
題があった。[Problems to be Solved by the Invention] However, dust such as paper powder and developer tend to adhere to the surface of the photoreceptor, and when such dust remains between the surface of the photoreceptor and the contact member,
There is a problem in that the contact state between the surface of the photoreceptor and the abutting member is partially impaired, leading to deterioration of charging efficiency in that portion, and the charging state on the surface of the photoreceptor becomes non-uniform, leading to deterioration of the image.
【０００４】この発明の目的は、感光体表面に付着した
紙粉等塵埃や現像剤などが感光体表面と当接部材との当
接範囲に滞留しないようにし、当接範囲における帯電効
率の部分的な劣化を防止して感光体表面の帯電状態を均
一にすることができ、画像の形成状態を常に良好に維持
することができる接触帯電装置を提供することにある。An object of the present invention is to prevent dust such as paper powder, developer, etc. attached to the surface of the photoreceptor from remaining in the contact area between the photoreceptor surface and the contact member, and to reduce the charging efficiency in the contact area. It is an object of the present invention to provide a contact charging device that can uniformly charge the surface of a photoreceptor by preventing physical deterioration, and can always maintain a good image formation state.
【０００５】[0005]
【課題を解決するための手段】この発明の接触帯電装置
は、感光体表面に当接する当接部材から感光体に直流電
圧を印加する接触帯電装置において、前記当接部材の感
光体との当接面に、前端に後退角を有する複数のブロッ
ク体を突出成形したことを特徴とする。[Means for Solving the Problems] A contact charging device of the present invention applies a DC voltage to the photoreceptor from a contact member that contacts the surface of the photoreceptor, in which the contact member contacts the photoreceptor. It is characterized in that a plurality of block bodies having a receding angle at the front end are protrusively molded on the contact surface.
【０００６】[0006]
【作用】この発明においては、感光体表面に付着した塵
埃等は当接部材の当接面に形成されたブロック体に当接
する。このブロック体は前端に後退角を備えているため
、塵埃等は感光体表面上を当接部材の後方に移動してい
く。当接部材の当接面においてブロック体は複数突出形
成されているため、各ブロック体の間に溝部が形成され
る。感光体表面上を移動した塵埃等はこの溝部を通過し
ながら当接部材の後方に移動していく。従って、感光体
の表面と当接部材の当接面との間に塵埃等が嵌入し、そ
こに滞留することはない。[Operation] In the present invention, dust and the like adhering to the surface of the photoreceptor come into contact with the block body formed on the contact surface of the contact member. Since this block body has a receding angle at the front end, dust and the like move on the surface of the photoreceptor toward the rear of the abutting member. Since a plurality of block bodies are formed to protrude from the contact surface of the contact member, a groove is formed between each block body. Dust and the like that have moved on the surface of the photoreceptor move to the rear of the abutting member while passing through this groove. Therefore, dust and the like do not get stuck between the surface of the photoreceptor and the abutment surface of the abutment member and remain there.
【０００７】[0007]
【実施例】図１は、この発明の実施例である接触帯電装
置の構成を示す概略図である。感光体ドラム１はレーザ
プリンタなどの電子写真装置内に回転軸４を介して回転
自在に支持されており、画像形成動作時に矢印Ａ方向に
回転する。この感光体ドラム１の周面の一部に当接部材
であるブレード２が軸方向の略全域に渡って当接する。
このブレード２は取付板３を介して電子写真装置の内部
に固定されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram showing the structure of a contact charging device according to an embodiment of the present invention. The photosensitive drum 1 is rotatably supported within an electrophotographic apparatus such as a laser printer via a rotating shaft 4, and rotates in the direction of arrow A during image forming operation. A blade 2, which is an abutting member, abuts on a part of the circumferential surface of the photosensitive drum 1 over substantially the entire area in the axial direction. This blade 2 is fixed inside the electrophotographic apparatus via a mounting plate 3.
【０００８】ブレード２は、例えば所定量のカーボンを
含有したウレタンゴムやシリコンゴムによって成形され
ており、導電性とともに弾力性を備えている。The blade 2 is made of, for example, urethane rubber or silicone rubber containing a predetermined amount of carbon, and has elasticity as well as electrical conductivity.
【０００９】ブレード２には金属製の取付板３を介して
直流電源５から所定の電圧が印加され、当接面２ａにお
ける感光体ドラム１の表面との当接により、感光体ドラ
ム１の表面に電荷を供給する。A predetermined voltage is applied to the blade 2 from a DC power source 5 via a metal mounting plate 3, and the surface of the photoreceptor drum 1 is caused to contact with the surface of the photoreceptor drum 1 at the contact surface 2a. supply a charge to.
【００１０】図２は、上記ブレードの要部を示す図であ
り、同図（Ａ）は底面図、同図（Ｂ）は（Ａ）における
Ｘ−Ｘ方向の矢視断面図である。ブレード２の当接面２
ａには複数のブロック体１１が突出成形されている。こ
のブロック体１１の前端部には後退角θが設けられてい
る。各ブロック体は所定の間隔を設けて成形されており
、各ブロック体１１の間には溝部１２が形成される。
この溝部１２の深さ（ブロック体１１の突出量）および
幅（ブロック体１１の間隔）は、感光体ドラム１の表面
に付着する紙粉や現像剤の粒径を考慮して決定される。
例えば紙粉が１０〜４０μｍであり、現像剤が５〜２０
μｍであることから、溝ブロック体１２の深さおよび幅
は０．１ｍｍ程度が適当であると考えられる。FIG. 2 is a diagram showing the essential parts of the blade, in which (A) is a bottom view, and (B) is a sectional view taken along the line X--X in (A). Contact surface 2 of blade 2
A plurality of block bodies 11 are projectingly molded on a. The front end of this block body 11 is provided with a sweepback angle θ. Each block body is formed with a predetermined interval, and a groove portion 12 is formed between each block body 11. The depth (the amount of protrusion of the block bodies 11) and the width (the interval between the block bodies 11) of the groove portion 12 are determined in consideration of the particle size of paper dust and developer that adhere to the surface of the photosensitive drum 1. For example, the paper powder is 10 to 40 μm, and the developer is 5 to 20 μm.
.mu.m, it is considered appropriate that the depth and width of the groove block body 12 be about 0.1 mm.
【００１１】以上の構成により、感光体ドラム１の表面
に付着した紙粉等の塵埃や現像剤がブレード２に対向す
る位置に達すると、ブレード２の当接面２ａに形成され
たブロック体１１に当接する。このブロック体１１には
前端に後退角が設けられているため、塵埃等はこのブロ
ック体１１の側面に当接して感光体１１の表面をブレー
ド２の後方、すなわち図１に示す矢印Ａ方向に移動して
いく。当接面２ａに形成された複数のブロック体１１は
何れも前端に後退角を備えているため、塵埃等はブロッ
ク体１１の間に構成される溝部１２内を通過することに
より、ブレード２の後方への移動を継続する。With the above configuration, when dust such as paper dust and developer attached to the surface of the photosensitive drum 1 reach a position facing the blade 2, the block body 11 formed on the contact surface 2a of the blade 2 is removed. comes into contact with. Since this block body 11 is provided with a receding angle at the front end, dust and the like come into contact with the side surface of this block body 11 and move the surface of the photoreceptor 11 toward the rear of the blade 2, that is, in the direction of arrow A shown in FIG. Moving on. Since each of the plurality of block bodies 11 formed on the contact surface 2a has a receding angle at the front end, dust and the like pass through the grooves 12 formed between the block bodies 11, thereby preventing the blade 2 from moving. Continue moving backwards.
【００１２】ブレード２の当接面２ａにブロック体１１
が突出成形されているため、実際には、このブロック体
１１の底面が感光体ドラム１の表面に当接することにな
る。A block body 11 is provided on the contact surface 2a of the blade 2.
Since the block body 11 is formed in a protruding manner, the bottom surface of the block body 11 actually comes into contact with the surface of the photosensitive drum 1.
【００１３】すなわち、ブロック体１１の底面が実当接
面である。感光体ドラム１の表面に付着した塵埃等はブ
ロック体１１の間に構成された溝部１２内を通過してブ
レード２の後方に移動することにより、この実当接面と
感光体ドラム１の表面との間に嵌入することがなく、感
光体ドラム１の表面における帯電効率が部分的に劣化す
るといったことがない。That is, the bottom surface of the block body 11 is the actual contact surface. Dust and the like adhering to the surface of the photoreceptor drum 1 pass through the groove 12 formed between the block bodies 11 and move to the rear of the blade 2, so that the actual contact surface and the surface of the photoreceptor drum 1 are removed. The charging efficiency on the surface of the photoreceptor drum 1 will not deteriorate partially.
【００１４】なお、溝部１２のピッチ、すなわちブロッ
ク体１１の形成間隔は、感光体ドラム１の回転方向にお
けるブレード２との当接範囲中に複数個のブロック体１
１が存在するように決定する。感光体ドラム１の回転方
向の当接範囲についてブロック体１１が１列のみ形成さ
れている場合には、隣合うブロック体１１の間隙におい
てブレード２と感光体ドラム１の表面とが当接しないこ
とになり、この部分において帯電むらを生じるからであ
る。The pitch of the grooves 12, that is, the interval between the blocks 11, is determined by the pitch of the grooves 12, that is, the interval at which the blocks 11 are formed.
1 exists. When only one row of block bodies 11 is formed in the contact range of the photoconductor drum 1 in the rotational direction, the blade 2 and the surface of the photoconductor drum 1 do not come into contact in the gap between adjacent block bodies 11. This is because charging becomes uneven in this portion.
【００１５】また、図３に示すようにブレード２１の当
接面に別の形状のブロック体２２を突出成形してもよい
。この場合にも隣接するブロック体２２の間に溝部２３
が形成され、この溝部２３内に感光体ドラム１の表面に
付着した塵埃等を通過させてブレード２１の後方に移動
させることができる。Furthermore, as shown in FIG. 3, a block body 22 having a different shape may be formed to protrude from the contact surface of the blade 21. Also in this case, a groove 23 is formed between adjacent block bodies 22.
is formed, and dust and the like attached to the surface of the photoreceptor drum 1 can pass through the groove 23 and be moved to the rear of the blade 21.
【００１６】[0016]
【発明の効果】この発明によれば、感光体表面に付着し
た塵埃等を当接部材の後方に移動させることができ、こ
れらが当接部材との間に嵌入してそこに滞留することを
防止し、塵埃等の滞留による帯電効率の部分的な劣化を
生じることがなく、感光体表面における帯電状態を均一
にして画像の形成状態を良好に維持することができる。[Effects of the Invention] According to the present invention, dust and the like attached to the surface of the photoconductor can be moved to the rear of the abutting member, and dust and the like can be prevented from getting stuck between the abutting member and staying there. This prevents local deterioration of charging efficiency due to the accumulation of dust and the like, making it possible to uniformly charge the surface of the photoreceptor and maintain a good image formation state.
【図１】この発明の実施例である接触帯電装置の構成を
示す概略図である。FIG. 1 is a schematic diagram showing the configuration of a contact charging device that is an embodiment of the present invention.
【図２】同接触帯電装置の当接部材の要部を示す図であ
る。FIG. 2 is a diagram showing a main part of a contact member of the contact charging device.
【図３】この発明の別の実施例に係る接触帯電装置の突
出部材の要部を示す図である。FIG. 3 is a diagram showing a main part of a protruding member of a contact charging device according to another embodiment of the present invention.
１−感光体ドラム ２−ブレード（当接部材） ２ａ−当接面 １１−ブロック体 θ−後退角 1-Photoreceptor drum 2-Blade (contact member) 2a-Abutment surface 11-Block letters θ - recession angle
Claims (1)
に直流電圧を印加する接触帯電装置において、前記当接
部材の感光体との当接面に、前端に後退角を有する複数
のブロック体を突出成形したことを特徴とする接触帯電
装置。1. A contact charging device that applies a DC voltage to the photoreceptor from an abutment member that abuts the surface of the photoreceptor, wherein the abutment surface of the abutment member that contacts the photoreceptor has a plurality of A contact charging device characterized by having a block body formed in a protruding manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7528791A JPH04309973A (en) | 1991-04-08 | 1991-04-08 | Contact electrostatic charging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7528791A JPH04309973A (en) | 1991-04-08 | 1991-04-08 | Contact electrostatic charging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04309973A true JPH04309973A (en) | 1992-11-02 |
Family
ID=13571868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7528791A Pending JPH04309973A (en) | 1991-04-08 | 1991-04-08 | Contact electrostatic charging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04309973A (en) |
-
1991
- 1991-04-08 JP JP7528791A patent/JPH04309973A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7469116B2 (en) | Image forming apparatus | |
| US5715499A (en) | Contact charger having an oscillating voltage for charging a photosensitive member | |
| US6173144B1 (en) | Image forming apparatus which supplies image bearing member with electrically conductive particles during development | |
| KR100307890B1 (en) | Image forming apparatus | |
| JPH1073983A (en) | Image forming device | |
| EP0642063B1 (en) | charging device and image forming apparatus containing the charging device | |
| EP0984333B1 (en) | Charging apparatus for charging an image bearing member | |
| JPH04309973A (en) | Contact electrostatic charging device | |
| US6519433B1 (en) | Image forming apparatus in which electroconductive particles are supplied to charging means from developing device by way of image bearing member | |
| US6091917A (en) | Image forming apparatus in which a charger provided with a charging wire and a grid is detachably mountable | |
| US5321472A (en) | Charging member with a bridging electrode structure and charging device using same in an image forming apparatus | |
| JP4522172B2 (en) | Corona discharge device and image forming apparatus having the same | |
| US7421222B2 (en) | Electrophotographic device with contaminant-resistant photoconductor and charger | |
| JP4268483B2 (en) | Charging device | |
| JP2518826Y2 (en) | Charger in electrophotographic image forming apparatus | |
| US20030161660A1 (en) | Image forming apparatus | |
| JP4653329B2 (en) | Discharge device and image forming apparatus using the same | |
| JPH10288881A (en) | Proximity electrifier | |
| JP2007041242A (en) | Image forming apparatus | |
| JPH10282798A (en) | Image forming device | |
| JP4886121B2 (en) | Charging member, charging device, image forming apparatus, and cartridge | |
| JP2000214656A (en) | Image forming device and electrostatic charging device | |
| JPH05119579A (en) | Electrostatic charger for electrophotographic device | |
| JP4366060B2 (en) | Image forming apparatus | |
| JPH01124877A (en) | Conductive brush for electrostatic charging device of electrophotographic recorder |