JPS62226177A - Electrophotographic device - Google Patents
Electrophotographic deviceInfo
- Publication number
- JPS62226177A JPS62226177A JP61067926A JP6792686A JPS62226177A JP S62226177 A JPS62226177 A JP S62226177A JP 61067926 A JP61067926 A JP 61067926A JP 6792686 A JP6792686 A JP 6792686A JP S62226177 A JPS62226177 A JP S62226177A
- Authority
- JP
- Japan
- Prior art keywords
- photoreceptor
- photosensitive body
- light
- charging
- charged area
- 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
- 238000007600 charging Methods 0.000 claims abstract description 28
- 108091008695 photoreceptors Proteins 0.000 claims description 60
- 230000003068 static effect Effects 0.000 claims description 23
- 230000008030 elimination Effects 0.000 claims description 12
- 238000003379 elimination reaction Methods 0.000 claims description 12
- 229910021417 amorphous silicon Inorganic materials 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 230000003472 neutralizing effect Effects 0.000 claims description 3
- 239000012212 insulator Substances 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 claims 1
- 238000007786 electrostatic charging Methods 0.000 abstract 2
- 230000007423 decrease Effects 0.000 description 7
- 230000005611 electricity Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920003227 poly(N-vinyl carbazole) Polymers 0.000 description 2
- 239000011669 selenium Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 150000004770 chalcogenides Chemical class 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Landscapes
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Photoreceptors In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
この発明は、転写方式の電子写真３Ａ置等の電子写真３
Ａ置に関し、特に、除電による感光体の帯電電位の減少
を防止することができる電子写真装置に関する。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention relates to an electrophotographic 3
The present invention relates to position A, and particularly relates to an electrophotographic apparatus that can prevent a decrease in the charged potential of a photoreceptor due to static elimination.
（従来の技術）
普通紙複写機及びレーザプリンタ等の電子写真装置にお
いては、コロナ放電により感光体表面を帯電させ、画像
露光により感光体中に生じた電子、正孔の対のいずれか
一方と感光体表面の電荷とを中和させ、感光体表面に静
電潜像を形成する。(Prior art) In electrophotographic devices such as plain paper copying machines and laser printers, the surface of a photoreceptor is charged by corona discharge, and one of the pairs of electrons and holes generated in the photoreceptor by image exposure is used. The charge on the surface of the photoreceptor is neutralized, and an electrostatic latent image is formed on the surface of the photoreceptor.
この静電潜像に現像剤として感光体表面の電荷と逆−帯
電したトナーと呼ばれる黒粉体をクーロン力で付着させ
ることで静電潜像が可視化される。次いで、このトナー
を紙に転写することにより転写紙上に画像が（ｑられる
。その後、感光体表面をクリーニングした後、次順の画
像形成のために感光体表面の静電潜像が消去される。こ
の工程は除電と呼ばれ、通常、感光体全面に光を照射す
ることによりなされる。The electrostatic latent image is made visible by attaching black powder called toner, which is charged oppositely to the charge on the surface of the photoreceptor, as a developer to this electrostatic latent image using Coulomb force. Next, this toner is transferred to paper to form an image on the transfer paper.Then, after cleaning the photoreceptor surface, the electrostatic latent image on the photoreceptor surface is erased for the next image formation. This process is called static elimination, and is usually performed by irradiating the entire surface of the photoreceptor with light.
従来、感光体として使用されているものには、セレン（
Ｓｅ）等のカルコゲナイド系のものや、ポリビニルカル
バゾール（ＰＶＫ）等の有機半導体等があるが、可視光
に対する感度が低い。また、強度が低く、電子写真感光
体に応用した場合に、寿命が短い。更に、温度安定性が
低い等の不具合がある。Conventionally, materials used as photoreceptors include selenium (
There are chalcogenides such as Se) and organic semiconductors such as polyvinylcarbazole (PVK), but these have low sensitivity to visible light. In addition, it has low strength and has a short life when applied to electrophotographic photoreceptors. Furthermore, there are other problems such as low temperature stability.
このような欠点を解消すべり、最近注目されている材料
にアモルファスシリコン（以下、ａ −８１と略す）が
ある。ａ−３ｉは感光波長域が広く、高い分光感度を有
する。ごッカース硬度が約１０００と高く、長寿命であ
ることが期待でき、温度安定性に優れる等の多くの利点
を有する。このような利点により、ａ−８ｉｔｉ！子写
真装置に使用する場合には、１工程に要する時間を短縮
することができる。即ち、ａ−３ｉは、高速複写に有効
である。Amorphous silicon (hereinafter abbreviated as a-81) is a material that has been attracting attention recently because it overcomes these drawbacks. a-3i has a wide sensitive wavelength range and high spectral sensitivity. It has a high Gockers hardness of about 1000, can be expected to have a long life, and has many advantages such as excellent temperature stability. With these advantages, a-8iti! When used in a secondary photographic device, the time required for one process can be shortened. That is, a-3i is effective for high-speed copying.
（発明が解決しようとする問題点）
しかしながら、通常の複写プロセスにおいては、除雪手
段と帯電手段とが近接しており、除電のために感光体表
面を光照射すると、帯電手段における感光体表面の帯電
域に漏出してしまう。このように帯電域に光が漏出する
と、帯電域においてキャリアが発生し、感光体の帯電電
位が大きく低下してしまう。従って、衣類の帯電におい
ては、前回と同じ電圧を印加しても、暗中の場合の５０
％乃至８０％の帯′ＲＮ位しか示さないという問題点を
有する。このように帯電電位が低下すると、画像のコン
トラストが小さくなり画質が悪化してしまう。(Problem to be Solved by the Invention) However, in a normal copying process, the snow removal means and the charging means are close to each other, and when the surface of the photoreceptor is irradiated with light for static electricity removal, the surface of the photoreceptor in the charging means is It leaks into the charged area. When light leaks into the charged area in this way, carriers are generated in the charged area, and the charging potential of the photoreceptor decreases significantly. Therefore, when charging clothing, even if the same voltage is applied as before, it will be 50% lower than in the dark.
The problem is that it only shows bands of % to 80%. When the charging potential decreases in this way, the contrast of the image decreases and the image quality deteriorates.
この発明は、斯かる事情に鑑みてなされたものであって
、除電による感光体の帯電電位の減少を防止することが
できる電子写真装置を提供することを目的とする。The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an electrophotographic apparatus that can prevent a decrease in the charged potential of a photoreceptor due to static elimination.
［発明の構成］
（問題点を解決するための手段）
この発明に係る電子写真装置は、アモルファスシリコン
により形成された感光体と、この感光体の表面を帯電さ
せる帯電手段と、前記感光体の表面に静電潜像を形成す
る潜像形成手段と、前記静電潜像をトナーで現像する現
像手段と、この現像手段による像を転写材に転写する転
写手段と、転写後に感光体の表面に残留するトナーをク
リーニングするクリーニング手段と、前記感光体を光除
電する除電手段とを有する電子写真装置であって、前記
除電手段と前記帯電手段との間に遮光部材を配設し、こ
の遮光部材により除電用の光が帯電手段による感光体の
帯電領域に漏出することを遮ることを特徴とする。[Structure of the Invention] (Means for Solving Problems) An electrophotographic apparatus according to the present invention includes a photoreceptor made of amorphous silicon, a charging means for charging the surface of the photoreceptor, and a charging means for charging the surface of the photoreceptor. a latent image forming means for forming an electrostatic latent image on the surface; a developing means for developing the electrostatic latent image with toner; a transfer means for transferring the image formed by the developing means onto a transfer material; and a surface of the photoconductor after transfer. An electrophotographic apparatus comprising: a cleaning means for cleaning toner remaining on the photoreceptor; and a static eliminating means for optically neutralizing the photoreceptor; a light shielding member is disposed between the static eliminating means and the charging means; The member is characterized in that the light for charge elimination is prevented from leaking into the charged area of the photoreceptor by the charging means.
（作用）
この発明においては、感光体表面が帯電され、帯電され
た感光体表面に静電潜像が形成され、この静電潜像が現
像され、現像されたトナー像が転写材に転写され、感光
体の表面に残留する現像剤がクリーニングされ、感光体
が除電される。この場合に、除電手段と帯電手段との間
に遮光部材が設けられているので、感光体に光を照射し
て除電しても、この光が帯電手段による感光体の帯電域
に漏出することが防止される。これにより、帯電手段に
よる感光体の帯電域における帯ｍ電位の低下を防止する
ことができる。(Function) In this invention, the surface of the photoreceptor is charged, an electrostatic latent image is formed on the charged surface of the photoreceptor, this electrostatic latent image is developed, and the developed toner image is transferred to the transfer material. , the developer remaining on the surface of the photoreceptor is cleaned and the photoreceptor is neutralized. In this case, since a light shielding member is provided between the static eliminating means and the charging means, even if the photoreceptor is irradiated with light to eliminate the static electricity, this light will not leak into the charged area of the photoreceptor by the charging means. is prevented. Thereby, it is possible to prevent the potential of the band m from decreasing in the charging region of the photoreceptor by the charging means.
また、この遮光部材を感光体表面に接触するように設け
ることにより、除電用の光が感光体の帯電領域に漏出す
ることを防止する効果が一層向上する。この場合には、
この遮光板は絶縁物であることが必要である。Moreover, by providing this light shielding member so as to be in contact with the surface of the photoreceptor, the effect of preventing the discharge light from leaking into the charged area of the photoreceptor is further improved. In this case,
This light shielding plate needs to be an insulator.
（実施例）
以下、添附の図面を参照してこの発明の実施例について
具体的に説明する。第１図はこの実施例に係る電子写真
装置の模式図である。アモルファスシリコン感光体１を
表面に配したドラム２は、回転可能に設けられており、
矢印２０方向に図示しない駆動手段により回転されるよ
うになっている。このドラム２の周囲には、感光体１の
表面を帯電させる帯電チャージャ３、画ｆｌｉｆｔ光１
２を発生させる露光装置４、静電潜像をトナー５により
現像する現像器６、現像された像を転写紙１１に転写す
る転写チャージャ７、感光体表面に残留するトナー５を
除去するクリーナ８及び感光体１を除電する光を発生す
る除電ランプ９がこの順番で配設されている。また、こ
の除電ランプ９と前記帯電チャージャ３との間には、除
電ランプ９のボックス９ａに隣接するように遮光板１０
が配設されている。この遮光板１０はプラスチック製で
あり、その一端が感光体１に接触していて、除電用の光
が帯電領域に漏出することを防止している。(Embodiments) Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 is a schematic diagram of an electrophotographic apparatus according to this embodiment. A drum 2 having an amorphous silicon photoreceptor 1 arranged on its surface is rotatably provided.
It is designed to be rotated in the direction of arrow 20 by a drive means (not shown). Around this drum 2, there is a charger 3 that charges the surface of the photoreceptor 1, and an image flip light 1.
2, a developer 6 that develops the electrostatic latent image with toner 5, a transfer charger 7 that transfers the developed image onto transfer paper 11, and a cleaner 8 that removes the toner 5 remaining on the surface of the photoreceptor. and a static elimination lamp 9 that generates light for neutralizing the photoreceptor 1 are arranged in this order. Further, a light shielding plate 10 is provided between the static eliminating lamp 9 and the charger 3 so as to be adjacent to the box 9a of the static eliminating lamp 9.
is installed. This light shielding plate 10 is made of plastic, and one end thereof is in contact with the photoreceptor 1 to prevent static elimination light from leaking into the charged area.
このように構成される電子写真＠置においては、先ず、
ドラム２を回転させつつ、帯電チャージャ３により感光
体１表面の帯電域１３を帯電させた後、画像露光１２に
より感光体１の表面に静電画像を形成させる。次いで、
感光体１の表面に現像器６からトナー５を供給して静電
潜像を現像し、この像を転写チャージャ７により転写紙
１１に転写させる。その後、感光体１の表面に残留する
トナー５をクリーナ８によって除去する。その後、感光
体１の表面に除電ランプからの光を照射し、感光体１の
表面を除電する。この場合に、遮光板１０が、除電ラン
プ９と帯電チャージャ３との間に設けられているので、
除電ランプ９から発生する光が感光体１の帯電チャージ
ャ３による帯電域１３に到達することが回避される。更
に、この場合に、遮光板１０は感光体１の表面に接触す
るように設けられているので、除電用の光が帯電域１３
に漏出することを略完全に防止することができる。この
ため、感光体１の帯電域１３において、帯電電位の低下
を防止することができる。また、前記遮光板１０は感光
体１の表面に接触しているので、ドラム２の回転により
遮光板１０と感光体１との間にＪｌ擦力が発生するが、
ａ−３ｉは、ビッカース硬度が約１０００と高いので、
遮光板１０によって感光体１の表面が摩耗する虜がない
。In the electrophotography system configured in this way, first of all,
While rotating the drum 2, a charged area 13 on the surface of the photoreceptor 1 is charged by the charger 3, and then an electrostatic image is formed on the surface of the photoreceptor 1 by image exposure 12. Then,
Toner 5 is supplied from a developing device 6 to the surface of the photoreceptor 1 to develop an electrostatic latent image, and this image is transferred onto a transfer paper 11 by a transfer charger 7. Thereafter, the toner 5 remaining on the surface of the photoreceptor 1 is removed by a cleaner 8. Thereafter, the surface of the photoreceptor 1 is irradiated with light from a static elimination lamp to eliminate static electricity from the surface of the photoreceptor 1. In this case, since the light shielding plate 10 is provided between the static elimination lamp 9 and the charger 3,
Light generated from the static elimination lamp 9 is prevented from reaching the charged area 13 of the photoreceptor 1 by the charger 3. Furthermore, in this case, the light shielding plate 10 is provided so as to be in contact with the surface of the photoreceptor 1, so that the light for static elimination is directed to the charged area 13.
It is possible to almost completely prevent leakage. Therefore, in the charged area 13 of the photoreceptor 1, a decrease in the charging potential can be prevented. Furthermore, since the light shielding plate 10 is in contact with the surface of the photoreceptor 1, a frictional force Jl is generated between the light shielding plate 10 and the photoreceptor 1 due to the rotation of the drum 2.
A-3i has a high Vickers hardness of about 1000, so
The light shielding plate 10 prevents the surface of the photoreceptor 1 from being worn out.
なお、この実施例においては、遮光板にプラスチックを
使用したが、例えばゴム等、他の絶縁材料を使用するこ
ともできる。Although plastic is used for the light shielding plate in this embodiment, other insulating materials such as rubber may also be used.
［発明の効果コ
この発明によれば、除電手段と帯電手段との間に遮光部
材を設けたので、除電用の光が帯電手段における感光体
の帯ｉ！域に漏出することを防止することができる。こ
のため、感光体の帯電域における帯電電位の低下を防止
することができ、感光体の帯電能を最大限に利用するこ
とができる。また、遮光部材を感光体に接触するように
設けることにより、除電用の光が帯電域に漏出すること
を略完全に防止することができ、帯電電位が減少する虞
を一層小さくすることができる。この場合に、感光体は
硬度が高いアモルファスシリコンでつくられているので
、遮光部材により感光体が摩耗する虞がない。[Effects of the Invention] According to the present invention, since the light shielding member is provided between the static eliminating means and the charging means, the static eliminating light is applied to the photoreceptor in the charging means. This can prevent leakage into the area. Therefore, it is possible to prevent the charging potential from decreasing in the charging area of the photoreceptor, and to make maximum use of the charging ability of the photoreceptor. Furthermore, by providing the light shielding member in contact with the photoconductor, it is possible to almost completely prevent static elimination light from leaking into the charged area, further reducing the possibility that the charging potential will decrease. . In this case, since the photoreceptor is made of amorphous silicon which has high hardness, there is no risk that the photoreceptor will be worn out by the light shielding member.
第１図はこの発明の実施例に係る電子写真装置の模式図
である。FIG. 1 is a schematic diagram of an electrophotographic apparatus according to an embodiment of the invention.
Claims (2)
体の表面を帯電させる帯電手段と、前記感光体の表面に
静電潜像を形成する潜像形成手段と、前記静電潜像をト
ナーで現像する現像手段と、この現像手段による像を転
写材に転写する転写手段と、転写後に感光体の表面に残
留するトナーをクリーニングするクリーニング手段と、
前記感光体を光除電する除電手段とを有する電子写真装
置において、前記除電手段と前記帯電手段との間に遮光
部材を配設し、この遮光部材により除電用の光が帯電手
段による感光体の帯電領域に漏出することを遮ることを
特徴とする電子写真装置。(1) A photoreceptor containing amorphous silicon, a charging means for charging the surface of the photoreceptor, a latent image forming means for forming an electrostatic latent image on the surface of the photoreceptor, and a toner for forming the electrostatic latent image on the surface of the photoreceptor. A developing means for developing, a transfer means for transferring the image formed by the developing means onto a transfer material, and a cleaning means for cleaning toner remaining on the surface of the photoreceptor after the transfer.
In the electrophotographic apparatus, the electrophotographic apparatus includes a static eliminating means for optically neutralizing the photoreceptor, and a light shielding member is disposed between the static eliminating means and the charging means, and the light shielding member allows light for static elimination to be applied to the photoreceptor by the charging means. An electrophotographic device characterized by blocking leakage into a charged area.
感光体表面に接触していることを特徴とする特許請求の
範囲第１項に記載の電子写真装置。(2) The electrophotographic apparatus according to claim 1, wherein the light shielding member is an insulator, and a tip thereof is in contact with the surface of the photoreceptor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61067926A JPS62226177A (en) | 1986-03-26 | 1986-03-26 | Electrophotographic device |
| US07/025,588 US4785324A (en) | 1986-03-26 | 1987-03-13 | Electrophotographic apparatus and method for preventing the lowering of a charging voltage at a photoreceptor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61067926A JPS62226177A (en) | 1986-03-26 | 1986-03-26 | Electrophotographic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62226177A true JPS62226177A (en) | 1987-10-05 |
Family
ID=13359005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61067926A Pending JPS62226177A (en) | 1986-03-26 | 1986-03-26 | Electrophotographic device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62226177A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007292909A (en) * | 2006-04-24 | 2007-11-08 | Kyocera Mita Corp | Image forming apparatus |
-
1986
- 1986-03-26 JP JP61067926A patent/JPS62226177A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007292909A (en) * | 2006-04-24 | 2007-11-08 | Kyocera Mita Corp | Image forming apparatus |
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