JPS63208878A - Electric charger - Google Patents
Electric chargerInfo
- Publication number
- JPS63208878A JPS63208878A JP4384387A JP4384387A JPS63208878A JP S63208878 A JPS63208878 A JP S63208878A JP 4384387 A JP4384387 A JP 4384387A JP 4384387 A JP4384387 A JP 4384387A JP S63208878 A JPS63208878 A JP S63208878A
- Authority
- JP
- Japan
- Prior art keywords
- photoreceptor
- charging
- charging device
- contact
- charged
- 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
- 239000000463 material Substances 0.000 claims abstract description 24
- 229920001971 elastomer Polymers 0.000 claims abstract description 18
- 108091008695 photoreceptors Proteins 0.000 claims description 68
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910021417 amorphous silicon Inorganic materials 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 20
- 239000010410 layer Substances 0.000 description 11
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 11
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 10
- 230000015556 catabolic process Effects 0.000 description 9
- 239000000047 product Substances 0.000 description 9
- 230000000903 blocking effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 229920006311 Urethane elastomer Polymers 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 241000519995 Stachys sylvatica Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
- G03G15/0208—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices by contact, friction or induction, e.g. liquid charging apparatus
- G03G15/0216—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices by contact, friction or induction, e.g. liquid charging apparatus by bringing a charging member into contact with the member to be charged, e.g. roller, brush chargers
- G03G15/0233—Structure, details of the charging member, e.g. chemical composition, surface properties
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【発明の詳細な説明】 イ、発明の目的 〔産業上の利用分野〕 本発明は帯電装置に関する。[Detailed description of the invention] B. Purpose of the invention [Industrial application field] The present invention relates to a charging device.
更に詳しくは、被帯電体面に電圧を印加した導電性部材
を接触させて被帯電体面を帯電(除電も含む)する接触
式(又は直接式)の帯電装置に関する。More specifically, the present invention relates to a contact-type (or direct-type) charging device that charges (including neutralizes) the surface of a charged object by bringing a conductive member applied with a voltage into contact with the surface of the charged object.
説明の便宜上、電子写真装置における感光体の帯電処理
を例にして説明する。For convenience of explanation, the charging process of a photoreceptor in an electrophotographic apparatus will be described as an example.
電子写真プロセスは周知のように感光体面を所定の電位
に均一帯電処理する行程を含んでいる。As is well known, the electrophotographic process includes a step of uniformly charging the surface of a photoreceptor to a predetermined potential.
例えば露光等によるW!像形成に先立って行う感光体面
の均−帯電処理等である。その帯電手段としては現在実
用化されている電子写真装置の殆どが金めつきタングス
テン線などのワイヤ電極とシールド板を主構成部材とす
るコロナ放電器を利用している。即ち該コロナ放電器の
ワイヤ電極に高電圧を印加することにより発生するコロ
ナを被帯電体たる感光体面に作用させて感光体面を所望
の表面電位に帯電させるものである。For example, W! due to exposure etc. This includes uniform charging treatment of the photoreceptor surface, etc., performed prior to image formation. As the charging means, most electrophotographic apparatuses currently in practical use use a corona discharger whose main components are a wire electrode such as a gold-plated tungsten wire and a shield plate. That is, by applying a high voltage to the wire electrode of the corona discharger, corona generated is applied to the surface of the photoreceptor, which is the object to be charged, so that the surface of the photoreceptor is charged to a desired surface potential.
コロナ放電器を用いた帯電処理は均一帯電性がよいけれ
ども、以下のような問題点を有している。Although charging treatment using a corona discharger has good uniform charging properties, it has the following problems.
1)高電圧印加
感光体に例えば500〜700vの表面電位を得るため
に004〜8KVといった高電圧をワイヤ電極に印加す
る必要がある。シールド板や本体へのリークを防1卜す
べくワイヤ電極とシールド板の距離を大きく維持する(
5〜8mm以上)等の処置をすると放電器自体が大型化
するし、高絶縁被覆ケーブルの使用等が不可欠となる。1) Application of high voltage In order to obtain a surface potential of, for example, 500 to 700 V to the photoreceptor, it is necessary to apply a high voltage of 0.04 to 8 KV to the wire electrode. Maintain a large distance between the wire electrode and the shield plate to prevent leakage to the shield plate and main body (
5 to 8 mm or more), the discharger itself becomes larger and the use of highly insulated cables becomes essential.
2)電力効率が悪い
ワイヤ電極からの放電電流の大半はシールド板へ流れ、
被帯電体たる感光体側へ流れるコロナ電流は総放電電流
の例えば5〜30%程度のものにすぎず、電力効率が悪
い。2) Most of the discharge current from the wire electrode with poor power efficiency flows to the shield plate,
The corona current flowing toward the photoreceptor, which is the charged object, is only about 5 to 30% of the total discharge current, and the power efficiency is poor.
3)ワイヤ汚れ
放電効率をあげるために曲率の大きいワイヤ電極(一般
的には60〜100#Lmの直径のものが用いられる)
が使用されるが、ワイヤ表面に形成される高電界によっ
て装置内の例えばトナー粒子φ紙繊維片・コロナ放電生
成物等の微小な塵埃を集塵してワイヤ表面が汚れる。ワ
イヤ汚れは放電にむらを生じ易く、それが画像むら・画
像白抜け・黒スジ等を生じさせる。従ってかなり頻繁に
ワイヤや放電器内を清掃処置する必要がある。3) Wire dirt Wire electrode with large curvature to increase discharge efficiency (generally, wire electrodes with a diameter of 60 to 100 #Lm are used)
However, the high electric field formed on the wire surface collects fine dust such as toner particles φ paper fiber pieces and corona discharge products inside the device, and the wire surface becomes dirty. Wire contamination tends to cause uneven discharge, which causes image unevenness, white spots, black lines, etc. Therefore, it is necessary to clean the wires and the inside of the discharger quite frequently.
4)コロナ放電生成物の発生 コロナ放電に伴ないかなり多着のオゾンの発生をみる。4) Generation of corona discharge products A considerable amount of ozone is generated due to corona discharge.
オゾンは空気中の窒素を酸化して窒素酸化物(NOx)
等を生成する。更には生成窒素酸化物は空気中の水分と
反応して硝酸などを生じさせる。このようなオゾン及び
その副次的生成物である窒素酸化物拳硝酸等のコロナ放
電生成物は感光体面や周辺の機器面に付着或は作用して
感光体面の変質・劣化、機器の酸化等を生じさせる。感
光体面へのコロナ放電生成物の付着は感光体面を低抵抗
化して電荷保持能を低下させ画像ボケを生じさせる結果
となる。又コロナ放電器のシールド板内面に付着したコ
ロナ放電生成物は電子写真装置の稼動中のみならず夜間
等の休止中に揮発遊離していき、それが該放電器の放電
開口に対応している感光体面に付着してその感光体部分
面を低抵抗化させる。そのため装置体止掻の装置再稼動
時に最初に出力される1枚目のコピーについて、上記装
置休止中の放電器開口に対応する部分面に画像ボケを生
じることはよく知られている。Ozone oxidizes nitrogen in the air to produce nitrogen oxides (NOx)
etc. Furthermore, the produced nitrogen oxides react with moisture in the air to produce nitric acid and the like. Corona discharge products such as ozone and its by-products such as nitrogen oxides and nitric acid adhere to or act on the photoreceptor surface and surrounding equipment surfaces, causing alteration and deterioration of the photoreceptor surface and oxidation of the equipment. cause Adhesion of corona discharge products to the photoreceptor surface lowers the resistance of the photoreceptor surface, lowering the charge retention ability and causing image blurring. In addition, the corona discharge products adhering to the inner surface of the shield plate of the corona discharger volatilize and liberate not only when the electrophotographic device is in operation but also during rest periods such as at night, and this corresponds to the discharge opening of the discharger. It adheres to the surface of the photoreceptor and lowers the resistance of that portion of the photoreceptor. For this reason, it is well known that in the first copy that is first output when the device is restarted, image blurring occurs in the portion corresponding to the opening of the discharger while the device is inactive.
使用感光体がアモルファスシリコン感光体(以下A−S
i感光体と略記する)である場合には、特に上記のコロ
ナ放電生成物による問題が大きくなる。即ちA−5i感
光体は他のCdJ−樹脂分散系、 ZnO−樹脂分散系
、Se−蒸着系、5e−Te蒸着系、OPC系等の感光
体に比べて帯電能が低く、そのために該A−5i感光体
についてのコロナ放電による帯電処理は上記のような他
の感光体の場合よりも放電(帯電)電流量を大幅に増大
させる構成がとられる。The photoreceptor used is an amorphous silicon photoreceptor (hereinafter referred to as A-S).
(abbreviated as i photoreceptor), the above-mentioned problems caused by corona discharge products become especially serious. That is, the A-5i photoreceptor has a lower charging ability than other CdJ-resin dispersion system, ZnO-resin dispersion system, Se-vapor deposition system, 5e-Te deposition system, OPC system, etc. Charging treatment using corona discharge for the -5i photoreceptor is configured to significantly increase the amount of discharge (charging) current than in the case of other photoreceptors as described above.
A−Si感光体は特に高速電子写真装置で用いられる場
合が多く、このような場合の放電電流量は2000IL
Aにものぼるものもある。放電電流量とオゾン発生量は
比例的関係にあることから、感光体がA−9i感光体で
あり、それをコロナ放電で帯電処理する系においては特
にオゾン発生量が多くなり、そのために前記コロナ放電
生成物の発生による問題が特に大きいものとなる。A-Si photoreceptors are often used especially in high-speed electrophotographic equipment, and the amount of discharge current in such cases is 2000 IL.
Some even reach A. Since there is a proportional relationship between the amount of discharge current and the amount of ozone generated, the amount of ozone generated is particularly large in a system where the photoreceptor is an A-9i photoreceptor and is charged by corona discharge, and therefore the amount of ozone generated is large. The problem caused by the generation of discharge products becomes particularly large.
上記のようなコロナ放電生成物による諸弊害を防止或は
低減させるべく、発生オゾンの積極的排除ファン手段、
吸収・分解フィルタ手段、ドラムヒータ手段等のIJm
を装置に具備させる必要がある。In order to prevent or reduce the harmful effects caused by corona discharge products as described above, fan means for actively eliminating generated ozone,
IJm of absorption/decomposition filter means, drum heater means, etc.
It is necessary to equip the equipment with the following.
そこで最近では上記のような問題点の多いコロナ放電器
を利用する代りに、接触(又は直接)帯電方法、即ち被
帯電体面に電圧を印加した導電性部材を当接させること
により被帯電体面に電荷を直接注入して所望の電位に帯
電処理する手法が研究され種々提案されている。Therefore, recently, instead of using a corona discharger which has many problems as mentioned above, a contact (or direct) charging method has been introduced, in other words, a method of charging the surface of the charged object by bringing a conductive member to which a voltage is applied into contact with the surface of the charged object. Various methods have been researched and proposed in which charging is performed to a desired potential by directly injecting charges.
例えば、感光体面に電圧を印加したブラシを接触させて
帯電する方法(特開昭513−104348号、同57
−87951号)、複数個の電圧印加接触子を接触させ
る帯電法(特開昭58−139156号)、オゾン量低
減と同時に感光体表面を摺擦研磨して積極的に画像ボケ
を解消しながら帯電する方法(特開昭58−15097
5号)、その他特開昭57−178287号、同56−
104351、同58−405H号など。For example, a method of charging a photoconductor by bringing a voltage-applied brush into contact with it (JP-A-513-104348, No. 57
-87951), a charging method in which multiple voltage application contacts are brought into contact (JP-A-58-139156), while simultaneously reducing the amount of ozone and polishing the photoreceptor surface to actively eliminate image blur. Charging method (JP-A-58-15097
No. 5), and other Japanese Patent Application Laid-open Nos. 178287-1987 and 56-
104351, No. 58-405H, etc.
接触帯電法は、被帯電体面に所望の帯電電位を得るため
に導電性部材に印加する電圧は、帯電部の低いA−5i
感光体の場合においても、コロナ放電器を用いて同様の
帯電電位を得るために該放電器に印加しなければならな
い電圧の数分の1或はそれ以下の低い電位で足り電力効
率がよい(例えば、コロナ放電による帯電では800〜
2000 ILA 10n 6〜8 KVを要しティた
ものが50〜150uLA/DCe O,5〜1.5に
Vで足りる)、オゾンの発生が極く少量である等の有利
性があり、問題の多いコロナ放電に代る帯電処理手法と
して有望である。In the contact charging method, in order to obtain a desired charging potential on the surface of the charged object, the voltage applied to the conductive member is set at a low A-5i of the charging part.
In the case of a photoreceptor, a low potential of a fraction or less of the voltage that must be applied to a corona discharger to obtain a similar charging potential is sufficient, resulting in good power efficiency ( For example, when charged by corona discharge, 800~
2000 ILA 10n 6 to 8 KV is required, but 50 to 150 uLA/DCe O, 5 to 1.5 V is sufficient), it has the advantage of generating very little ozone, and it solves the problem. This is a promising charging treatment method to replace the commonly used corona discharge.
特にA−S i感光体のように高硬度(ビッカース硬度
1000以上)・耐摩耗性等に優れたものに対する帯電
処理手法として適切なものと考えられる。It is considered to be particularly suitable as a charging treatment method for materials such as A-Si photoreceptors which have high hardness (Vickers hardness of 1000 or more) and excellent wear resistance.
しかし接触帯電法の上記のような種々の有利性にも拘ら
ず、該接触帯電法を利用した帯電装置を組込んだ電子写
真装置等の実用機は未だ出現するに至っていない。However, despite the various advantages of the contact charging method as described above, a practical device such as an electrophotographic device incorporating a charging device utilizing the contact charging method has not yet appeared.
その大きな理由としては均一帯電処理の安定性に欠ける
ことが挙げられる。即ちブラシ等の接触子の接触むら、
感光体との抵抗ミスマツチング等によって実際上所謂う
ろこむら帯電をみやすい。A major reason for this is the lack of stability in uniform charging treatment. In other words, uneven contact of contacts such as brushes,
In practice, it is easy to see so-called uneven charging due to resistance mismatching with the photoreceptor.
A−S i感光体の場合は更に所謂球状突起とよばれる
感光体欠陥部分の存在に起因する帯電むらや絶縁破壊ト
ラブルをみやすい。In the case of an A-S i photoreceptor, uneven charging and dielectric breakdown problems are more likely to occur due to the presence of defective portions of the photoreceptor called spherical protrusions.
A−9i感光体の場合、阻止型と単層の高抵抗型とがあ
る。阻止型はAi等の基体上に電荷注入阻止層・感光層
・表面保護層を順に積層したもので、電荷注入阻止層は
電子の注入を、表面保護層は正孔の注入を、それぞれ阻
止する役割を担っている。この阻止型は感光層を純粋に
できるため光メモリや光劣化に対して有効な対策を打つ
ことができる。高抵抗型はA−Si層を酸素等のドーピ
ングにより高抵抗化し電荷保持性を具備させたものであ
る。In the case of the A-9i photoreceptor, there are a blocking type and a single layer high resistance type. The blocking type has a charge injection blocking layer, a photosensitive layer, and a surface protective layer laminated in this order on a substrate such as Al. The charge injection blocking layer blocks the injection of electrons, and the surface protective layer blocks the injection of holes. plays a role. Since this blocking type allows the photosensitive layer to be made pure, it is possible to take effective measures against optical memory and photodeterioration. The high-resistance type is one in which the A-Si layer is doped with oxygen or the like to make the resistance high and has charge retention properties.
A−9i感光体は阻止型・高抵抗型の何れも他の感光体
に比べて耐劣化性、耐摩耗性、硬度、耐傷付き性、耐衝
撃性等にきわめて優れている。従って該A−Si感光体
は帯電処理のための導電性部材を圧接させても、感光層
の結晶化等による特性劣化。The A-9i photoreceptor, both blocking type and high resistance type, is extremely superior in deterioration resistance, abrasion resistance, hardness, scratch resistance, impact resistance, etc., compared to other photoreceptors. Therefore, even if the A-Si photoreceptor is pressed against a conductive member for charging, its characteristics deteriorate due to crystallization of the photosensitive layer.
圧痕、擦過傷、摩耗、導電性部材の表面材質との化学反
応による融着・汚損・変質等の問題は全くない、感光体
に対する導電性部材のメカニカルな当接・当接解除に伴
なう繰り返しの衝撃作用にも強い。There are no problems such as indentations, scratches, abrasion, or adhesion, staining, or deterioration due to chemical reactions with the surface material of the conductive member, and there are no problems such as mechanical contact and release of the conductive member against the photoreceptor. It is also resistant to impact effects.
しかしA−S i感光体の場合もその面を実際に接触帯
電したときA−9i感光体に製造上多少なりとも形成さ
れてしまう微小な所謂球状突起の存在により帯電むらを
生じやすい、球状突起の耐印加電圧(DC)が500〜
tooov程度であるため該球状突起部分で絶縁破壊を
見やすく、絶縁破壊を生じると1つの破壊点の軸方向全
体の帯電電荷がその破壊点に流れ帯電しなくなる。とい
う問題点が挙げられる。However, in the case of the A-Si photoconductor, when the surface is actually charged by contact, the spherical protrusions that tend to cause uneven charging due to the presence of so-called minute spherical protrusions that are formed to some extent on the A-9i photoconductor during manufacturing. Withstand voltage (DC) of 500~
Since the dielectric breakdown is about too much, it is easy to see dielectric breakdown at the spherical protrusion portion, and when dielectric breakdown occurs, the entire charge in the axial direction of one breakdown point flows to that breakdown point and is no longer charged. There is a problem with this.
A−Si層は一般に、光・熱・RF等をエネルギ源とす
る各種のCVD法によりシランガスを分解して堆積させ
ることにより形成される。そのうち現在は特性的・コス
ト的な観点からRFによるプラズマCvn法によりA−
9i感光体が製造されている。この際、基板−Eにゴミ
や凹凸部分などがあるとその部分を核にして基板上に堆
積形成されるA−9t膜が部分的に異常成長して球状突
起と呼ばれる感光体欠陥部分を発生する。そのような球
状突起の若干の発生は実際上さけられないのが現状であ
る。The A-Si layer is generally formed by decomposing and depositing silane gas using various CVD methods using light, heat, RF, or the like as an energy source. Currently, from the viewpoint of characteristics and cost, A-
9i photoreceptors have been manufactured. At this time, if there is dust or uneven parts on the substrate-E, the A-9t film that is deposited on the substrate will grow abnormally partially using those parts as nuclei, causing defective parts of the photoreceptor called spherical protrusions. do. At present, it is practically unavoidable that some occurrence of such spherical protrusions occurs.
本発明は上記に鑑みて研究開発されたもので、被帯電体
面を接触帯電方式で常に安定に均一帯電処理できるよう
にして、例えば電子写真装置について感光体の帯電手段
として問題点の多いコロナ放電器に代えて前述のような
種々のメリットのある接触式帯電装置を具備させた実用
性のあるものを実現することを目的とする。The present invention has been researched and developed in view of the above problems, and is capable of stably and uniformly charging the surface of a charged body using a contact charging method. The object of the present invention is to realize a practical device that is equipped with a contact charging device that has various advantages as described above in place of an electric appliance.
口1発明の構成
〔問題点を解決するための手段〕
本発明は、被帯電体面に電圧を印加した導電性部材を当
接させて被帯電体面を帯電する接触式帯電装置であって
、上記導電性部材の少なくとも前記被帯電体面と当接す
る表面材の材質をゴム硬度15〜80度(JIS Hs
)、電気抵抗値105〜106Ωの導電性ゴム材とした
、ことを特徴とする帯電装置を要旨とする。1. Structure of the Invention [Means for Solving Problems] The present invention is a contact charging device that charges the surface of a charged object by bringing a conductive member to which a voltage is applied to the surface of the charged object into contact with the surface of the charged object. The material of the surface material of the conductive member that comes into contact with at least the surface of the charged object has a rubber hardness of 15 to 80 degrees (JIS Hs
), the charging device is characterized by being made of a conductive rubber material having an electrical resistance value of 105 to 106 Ω.
即ち、導電性部材の少なくとも被帯電体面と当接する表
面材の材質を、ゴム硬度15〜80度、電気抵抗値10
5〜106Ωの導電性ゴム材にしてそれを被帯電体面に
接触させて接触帯電処理を行うと、後述実施例に示すよ
うに被帯電体面を常に安定に均一帯電処理でき、感光体
を帯電処理して画像形成する装置においては良好な画質
の画像を安定に出力させることができることを見出して
本発明を完成した。That is, the material of the surface material of the conductive member that comes into contact with at least the surface of the charged object has a rubber hardness of 15 to 80 degrees and an electrical resistance value of 10.
If a conductive rubber material with a resistance of 5 to 106 Ω is used and contact charging is performed by bringing it into contact with the surface of the object to be charged, the surface of the object to be charged can always be stably and uniformly charged, as shown in the examples below, and the photoreceptor can be charged. The present invention was completed based on the discovery that images of good quality can be stably output in an image forming apparatus.
第1図は本発明に従う接触式帯電装置を具備させたレー
ザ複写@ (LBP)の−例の極く概略構成を示したも
のである。FIG. 1 shows a very schematic structure of an example of a laser copying machine (LBP) equipped with a contact charging device according to the present invention.
1は矢示方向に所定の周速度で回転駆動されるドラム型
感光体であり1本例の場合はA−9i感光体である。該
感光体はその回転過程で後述するローラ型の接触成帯電
装N2によりその周面に正又は負の所定表面電位の均一
帯電処理を受け、次いで画像露光部3にて不図示のレー
ザビーム走査露光手段によるレーザビーム走査画像露光
りを受けることにより、露光画像パターンに対応した静
電潜像が順次に形成される。潜像は現像器4でトナー現
像され、その現像像が不図示の給紙手段部から搬送部5
を介して転写帯電器部6へ同期搬送された転写材P面に
対して順次に転写される。像転写を受けた転写材Pは分
離帯電器7により感光体1面から順次に分離されて搬送
部8で不図示の像定着手段部へ導入され1画像形成物と
して機外へプリントアウトされる。像転写後の感光体面
はクリーニング装置9により清浄化され、次いで前露光
器10による全面光照射(除電露光、イレーザ)を受け
、再び帯電装置2による均一帯電を受けて繰返して像形
成に供される。Reference numeral 1 denotes a drum-type photoreceptor that is rotated at a predetermined circumferential speed in the direction of the arrow, and in the case of one example, it is an A-9i photoreceptor. During the rotation process, the photoreceptor is uniformly charged to a predetermined positive or negative surface potential on its circumferential surface by a roller-type contact charging device N2, which will be described later.Then, the image exposure unit 3 scans the photoreceptor with a laser beam (not shown). By receiving laser beam scanning image exposure by the exposure means, electrostatic latent images corresponding to the exposed image pattern are sequentially formed. The latent image is developed with toner in a developing device 4, and the developed image is transferred from a paper feeding section (not shown) to a conveying section 5.
The images are sequentially transferred onto the surface of the transfer material P, which is synchronously conveyed to the transfer charger section 6 via the transfer charger section 6. The transfer material P that has undergone the image transfer is sequentially separated from one surface of the photoreceptor by the separation charger 7, is introduced into an image fixing means (not shown) in the conveyance section 8, and is printed out outside the machine as a single image formation. . After the image has been transferred, the surface of the photoreceptor is cleaned by a cleaning device 9, then subjected to full-surface light irradiation (discharge exposure, eraser) by a pre-exposure device 10, uniformly charged again by a charging device 2, and repeatedly used for image formation. Ru.
帯電装置2は本例のものはローラ型で、且つ複写機本機
内に挿脱自在のユニットとして構成しである(以下ロー
ラ帯電装置と記す)、第2図はそのローラ帯電装置ユニ
ットを抜き出してローラ側を上にした状態の斜視図であ
る。21は基板、22・22はその基板裏面の手前端側
と奥端側とに固設した一対の突片、23・23はその各
突片に軸23a・23aを中心に回動自由に設けた一対
のレバー、24・24はその一対の各レバーを夫々軸2
3a・23aを中心に時計方向に常時回動付勢する加圧
スプリング、25は各レバー23・23の加圧スプリン
グ配設側と反対側の腕部間に回転自由に軸受支持させた
、感光体1面に接触して該感光体面を直接帯電する導電
性部材としてのローラ(以下導電ローラと記す)である
、本例の該導電ローラ25は金属芯金としての軸棒25
aと、それに一体に外装したゴム硬度15〜80度、電
気抵抗値105〜106Ωの導電性ゴム材層25bとか
らなる。26は基板21の手前側端部に設けたユニット
挿脱操作用の掴み取手、27は奥側端部に外方へ突出さ
せて設けた受電コネクタ、28は基部を基板21に固定
し、先端部を前記導電ローラ25の軸棒25aに常時弾
性的に接触させた給電ブラシであり、この給電ブラシ2
8と前記受電コネクタ27とは電気的に導通している。The charging device 2 in this example is of a roller type and is configured as a unit that can be inserted and removed from the copying machine (hereinafter referred to as the roller charging device). Fig. 2 shows the roller charging device unit taken out. FIG. 3 is a perspective view with the roller side facing up. Reference numeral 21 denotes a board; 22 and 22 are a pair of protrusions fixed to the front end and the rear end of the back surface of the board; and 23 and 23 are provided to each of the protrusions so as to be freely rotatable about shafts 23a and 23a. A pair of levers 24 and 24 each have a shaft 2.
Pressure springs 3a and 23a are always rotated in a clockwise direction, and 25 is a photosensitive sensor rotatably supported by a bearing between the arms of each lever 23 and 23 on the side opposite to the pressure springs. The conductive roller 25 of this example, which is a roller (hereinafter referred to as a conductive roller) as a conductive member that directly charges the surface of the photoreceptor by contacting the surface of the photoreceptor, has a shaft rod 25 as a metal core.
a, and an electrically conductive rubber material layer 25b having a rubber hardness of 15 to 80 degrees and an electrical resistance value of 105 to 106 Ω, which is integrally packaged therewith. Reference numeral 26 indicates a grip handle for inserting and removing the unit, which is provided at the front end of the board 21, 27 is a power receiving connector, which is provided at the back end and projects outward, and 28, the base is fixed to the board 21, and the tip This is a power supply brush whose part is always elastically in contact with the shaft 25a of the conductive roller 25, and this power supply brush 2
8 and the power receiving connector 27 are electrically connected.
上記のローラ帯電装置ユニット2は、導電ローラ25側
を下向きにした姿勢にして受電コネクタ27側を先にし
て複写機本機側のガイドレール29・29(第1図)間
に基板21の長手両縁部を係合させ、導電ローラ25を
加圧スプリング241124に抗して感光体1面に摺接
しないように上方へ逃がした状態にして不図示のストッ
パに受止められるまで本機内に十分に押し込んで装着す
る0次いで導電ローラ25を自由状態にする。このロー
ラ帯電装置ユニット2の装着状態において、受電コネク
タ27は複写機本機側の不図示の給電コネクタと電気的
に結合状態となり、該給電コネクタ→受電コネクタ27
→給電ブラシ28→軸棒25aの経路で本機側の電源か
ら導電ローラ25に対して所定の電圧示印加可能状態と
なる。The roller charging device unit 2 is placed between the guide rails 29 and 29 (FIG. 1) on the side of the copying machine with the conductive roller 25 side facing downward and the power receiving connector 27 side first. Both edges are engaged, and the conductive roller 25 is released upward against the pressure spring 241124 so as not to come into sliding contact with the surface of the photoreceptor 1, until it is received by a stopper (not shown). Then, the conductive roller 25 is set in a free state. When the roller charging device unit 2 is installed, the power receiving connector 27 is electrically connected to the power feeding connector (not shown) on the side of the copying machine, and the power feeding connector → the power receiving connector 27
A predetermined voltage can be applied to the conductive roller 25 from the power source of the machine through the path of → power supply brush 28 → shaft rod 25a.
又導電ローラ25は加圧スプリング24−24により外
装である導電性ゴム材層25bの外面が感光体1面に対
して所定の加圧力(例えば線圧0.01〜0.2Kg/
cm)をもって常時圧接した状態に保たれる。末例の導
電ローラ25は感光体lの回転に伴ない従動回転し、そ
の従動回転過程でも感光体lの外周面に対して所定の加
圧力をもって常時圧接した状態に保たれ、又給電ブラシ
28は軸棒25aに対して電気的に導通した状態に保た
れる。Further, the conductive roller 25 is pressed by a pressure spring 24-24 so that the outer surface of the conductive rubber material layer 25b, which is the exterior, is applied to the surface of the photoreceptor 1 with a predetermined pressure (for example, a linear pressure of 0.01 to 0.2 kg/
cm) and are kept in constant pressure contact. The conductive roller 25 in the last example rotates in accordance with the rotation of the photoreceptor 1, and even during the rotation process, it is always kept in pressure contact with the outer peripheral surface of the photoreceptor 1 with a predetermined pressure, and the power supply brush 28 is maintained in electrical continuity with the shaft rod 25a.
ローラによる接触帯電は感光体1とローラ25との曲率
差による連続の任意のギャップにおいて放電を開始し、
印加電圧により一定のギャップ領域が安定的に放電を維
持するといった特徴がある。ブラシ方式の場合は点接触
の集合になるのに対し、ローラ方式では剛性をもったロ
ーラを感光体に圧接し面接触になるためのギャップ等の
位置出しが安定するとともに先端放電によらないため耐
久性も向上する。Contact charging by the roller starts discharging at any continuous gap due to the difference in curvature between the photoreceptor 1 and the roller 25,
It has the characteristic that a certain gap region maintains stable discharge depending on the applied voltage. In the case of the brush method, it is a collection of point contacts, whereas in the roller method, a rigid roller is brought into pressure contact with the photoconductor, and the positioning of gaps, etc. for surface contact is stable, and there is no tip discharge. Durability is also improved.
a、帯電能力
第1図のように感光体として回転ドラム型のA−9i感
光体を用い、該感光体面をコロナ放電器で一様に一次帯
電処理する方式の既存のレーザ複写機(キャノン製MP
9030.30 cp層、プロセススピード180mm
/5ec)について、コロナ放電器による場合の帯電と
、そのコロナ放電器を取外し前記第1・2図示のような
接触式帯電装置であるローラ帯電装置2を装着して該装
置2による場合の帯電との能力差を調べた。a. Charging Capacity As shown in Figure 1, an existing laser copying machine uses a rotating drum-type A-9i photoconductor as a photoconductor, and the surface of the photoconductor is uniformly primary charged with a corona discharger (Canon Co., Ltd.). MP
9030.30 cp layer, process speed 180mm
/5ec), charging by a corona discharger, and charging by removing the corona discharger and attaching a roller charging device 2 which is a contact charging device as shown in Figures 1 and 2 above. We investigated the difference in ability between
第3図グラフにその結果を示す、横軸はローラ帯電装N
2の導電ローラ25の軸棒25aに印加する電圧、又は
コロナ放電器のコロナ帯電ワイヤに印加する電圧、縦軸
は感光体lの現像位置での表面電位である。Aはローラ
帯電装置2による帯電の場合、Bはコロナ放電器による
帯電の場合である。感光体面に標準的暗部電位である
400vの電位を得るのに、ローラ帯電装置12による
場合はコロナ放電器による場合の約l/10の印加電圧
で済むことがわかる。The results are shown in the graph in Figure 3. The horizontal axis is the roller charging device N.
The voltage applied to the shaft rod 25a of the conductive roller 25 of No. 2 or the voltage applied to the corona charging wire of the corona discharger, and the vertical axis is the surface potential of the photoreceptor l at the developing position. A is the case of charging by the roller charging device 2, and B is the case of charging by the corona discharger. Standard dark potential on photoreceptor surface
It can be seen that in order to obtain a potential of 400 V, when using the roller charging device 12, the applied voltage is about 1/10 of that when using the corona discharger.
b、電流量−発生オシン量
又ローラ帯電装置2による帯電の場合と、コロナ放電器
による帯電の場合の両者における電源からの電流値(横
軸)と感光体表面電位(縦軸)の関係を調べた。Aはロ
ーラ帯電装置2による帯電の場合、Bはコロナ放電器に
よる帯電の場合である。感光体面に標準的暗部電位であ
る400vの電位を得る場合における電流量は、ローラ
帯電装置2による場合はコロナ放電器による場合の約尽
の電流量に押えられることがわかる。その結果発生オゾ
ン量はコロナ放電器の場合的40 ppmであったに対
して、ローラ帯電装置2の場合は約3PP膳に減少した
。b. Amount of current - amount of ossine generated, or the relationship between the current value from the power supply (horizontal axis) and the photoreceptor surface potential (vertical axis) in both cases of charging by the roller charging device 2 and charging by the corona discharger. Examined. A is the case of charging by the roller charging device 2, and B is the case of charging by the corona discharger. It can be seen that the amount of current when a potential of 400 V, which is a standard dark potential, is obtained on the surface of the photoreceptor is suppressed to about the same amount of current when using the roller charging device 2 as when using the corona discharger. As a result, while the amount of ozone generated was 40 ppm in the case of the corona discharger, it was reduced to about 3 ppm in the case of the roller charging device 2.
C、ローラ材質
ローラ帯電装!!2について導電ローラ25の外装25
bのゴム材質と抵抗値を種々に代えた場合におけるスパ
ーク数と出力コピーの画質を調べた。その結果を下表に
示す。C. Roller material: Roller charging device! ! Regarding 2, the exterior 25 of the conductive roller 25
The number of sparks and the image quality of output copies were investigated when the rubber material and resistance value of b were varied. The results are shown in the table below.
条件Vd400V(印加電圧、 1.3KVDc(7)
み)オイルのしみ出しによる帯電むらを防止し、又耐摩
耗性の観点からシリコーンゴムよりはウレタンゴムを選
択するのが好ましい、ウレタンゴムを用いることにより
、導電ローラ25を感光体1と相対スピード差を持たせ
ることが容易になり、ローラ25の回転ガタ等による帯
電むらを低減させたり、摺擦により感光体表面に付着し
た微量のコロナ生成物をかきとる効果を生ずる。Condition Vd400V (applied voltage, 1.3KVDc (7)
(b) It is preferable to select urethane rubber rather than silicone rubber from the viewpoint of preventing uneven charging due to oil seepage and from the viewpoint of wear resistance. By using urethane rubber, the relative speed of the conductive roller 25 with respect to the photoreceptor 1 can be increased. This makes it easy to create a difference, which has the effect of reducing charging unevenness due to rotational play of the roller 25, etc., and scraping off minute amounts of corona products adhering to the surface of the photoreceptor due to rubbing.
硬度は加圧機構が安定的に設定できる15〜80度、特
に45〜55度のものとするのが好ましいことがわかっ
た。It has been found that the hardness is preferably 15 to 80 degrees, particularly 45 to 55 degrees, so that the pressure mechanism can be stably set.
又抵抗値は105〜106Ωまで高めることにより絶縁
破壊を防1卜するとともに帯電むらもなく、高品質の画
像を得ることができることがわかった。It was also found that by increasing the resistance value to 10 5 to 10 6 Ω, it was possible to prevent dielectric breakdown and to obtain high quality images without uneven charging.
d、印加電圧等
導電ローラ25に対する印加電圧はDC(直流)だけで
もよいが、DC成分にAC(交流)成分を重畳したDC
+AC電圧の方がより良好な結果を得ることができる。d. Applied voltage etc. The voltage applied to the conductive roller 25 may be only DC (direct current), but it may be DC (direct current) with an AC (alternating current) component superimposed on the DC component.
+AC voltage can give better results.
DC成分 500〜100OV トAC成分1200
N1800Hz、soo 〜reoOv P−P (7
) oc+ ac重畳電圧ヲ印加スルコとにより帯電む
らのない良好な画像が得られた。DC component 500~100OV AC component 1200
N1800Hz, soo~reoOv P-P (7
) A good image without charging unevenness was obtained by applying an oc+ac superimposed voltage.
特にv p−pは効果が大きく、1400Vp−p 以
上ニすると導電ローラ25の汚れをカバーし、ローラ回
転に伴なう帯電むらをほとんど解消することができる。In particular, v pp is very effective, and when it is 1400 V pp or more, it can cover dirt on the conductive roller 25 and almost eliminate charging unevenness caused by rotation of the roller.
DC成分のみの場合は1.0〜1.5 KVを要するが
。In case of only DC component, 1.0 to 1.5 KV is required.
A−9i感光体に含まれる球状突起部のスパーク(絶縁
破壊)の発生率はAC印加時に比べて減少するメリツト
があるが、ローラに起因する帯電むらについての補償作
用は少ない。Although there is an advantage that the incidence of sparks (dielectric breakdown) in the spherical protrusions included in the A-9i photoreceptor is reduced compared to when AC is applied, there is little compensation effect for uneven charging caused by the roller.
導電ローラ25と感光体1とのギャップ精度はローラ帯
電による異常放電に大きく作用する。導電ローラ25に
ガタ等があると感光体1とローラ25の接触上流側、第
1図でいえばC領域に火花スパークを生ずる事がある。The gap precision between the conductive roller 25 and the photoreceptor 1 has a large effect on abnormal discharge due to roller charging. If the conductive roller 25 has backlash or the like, sparks may occur on the upstream side of the contact between the photoreceptor 1 and the roller 25, that is, in the area C in FIG. 1.
このスパークは電圧が1〜2KV程度のためA−Si感
光体のeI*的酎圧耐、OKVを越えず、従ってそれに
よってすぐに感光体上に欠陥を生ずるには至らないが、
帯電むらとして画像品質に影響をおよぼす事がある。こ
れを防IFするためにローラ25を非回転に停止して感
光体に圧接させることも効果的である。この際ローラ外
装たるゴム材質としてはウレタンゴム等摩耗に強いもの
を選ぶ必要がある。又導電性部材25はローラ型でなく
とも第5図(a)や(b)のように感光体1面に対して
非回転に圧接するパー、ド部材とすることもできる。Since the voltage of this spark is about 1 to 2 KV, it does not exceed the eI* voltage resistance (OKV) of the A-Si photoreceptor, and therefore it does not immediately cause defects on the photoreceptor.
The image quality may be affected by uneven charging. In order to prevent this from happening, it is also effective to stop the roller 25 from rotating and bring it into pressure contact with the photoreceptor. At this time, it is necessary to select a rubber material for the roller exterior that is resistant to wear, such as urethane rubber. Further, the conductive member 25 need not be of a roller type, but may be a pad member that presses against the surface of the photoreceptor in a non-rotating manner as shown in FIGS. 5(a) and 5(b).
不潜にして感光体にポチ(絶縁破壊)が生じたり、そこ
まで至らなくても球状突起が多数あった場合そこに集中
的に電流が流れてその軸方向の帯電ができなくなる事が
ある。これを防止するために105以上の抵抗を持つ導
電ローラを用い、かつ定電圧電源を用いる事により軸方
向全体の帯電抜けを2〜10mm程度の小さいものにお
さえる事が可能となった。If the photoreceptor is not insulated, a spot (dielectric breakdown) may occur, or even if it does not reach that point, if there are many spherical protrusions, current may flow intensively there, making it impossible to charge the photoreceptor in the axial direction. In order to prevent this, by using a conductive roller with a resistance of 105 or more and using a constant voltage power supply, it has become possible to suppress charge loss in the entire axial direction to a small value of about 2 to 10 mm.
ハ1発明の効果
以上のように本発明に依れば、被帯電体面を接触帯電方
式で常に安定に均一帯電処理することができ、従って例
えば電子写真複写機について感光体の帯電手段として問
題点の多いコロナ放電器に代えて、N々のメリットのあ
る接触式帯電装置を具備させた実用性のあるものを実現
することが可能となるもので、所期の目的がよく達成さ
れる。C1. Effects of the Invention As described above, according to the present invention, the surface of a charged body can always be stably and uniformly charged by a contact charging method, and therefore, there are problems as a means for charging a photoreceptor in, for example, an electrophotographic copying machine. In place of a corona discharger which has many advantages, it is possible to realize a practical device equipped with a contact type charging device which has many advantages, and the intended purpose is well achieved.
第1図は本発明に従う接触式帯電装置を具備させたレー
ザ複写機の一例の概略構成図、第2図は導電ローラ側を
上向きにした状態の帯電装置の斜視図、第3図・第4図
は特性測定グラフ、第5図(ロ))・(b)は夫々導電
性部材の他の構成例の横断面図である。
lは回転ドラム型のA−9i感光体、2はローラ型とし
て接触式帯電装置、25は導電ローラ、25aはその金
属芯金としての軸棒、25bはそれに外装した導電性ゴ
ム材層。
0 12 3 4 5 6 7 8 (KV)
OXX)2X)亘IB)’1JJED7Q)800’:
ω(だcpno@i
電流イ1(電邊、
仲1)
第5図
(a) (b)
第1図FIG. 1 is a schematic configuration diagram of an example of a laser copying machine equipped with a contact-type charging device according to the present invention, FIG. 2 is a perspective view of the charging device with the conductive roller side facing upward, and FIGS. 3 and 4 The figure is a characteristic measurement graph, and FIGS. 5(b) and 5(b) are cross-sectional views of other configuration examples of the conductive member. 1 is a rotating drum type A-9i photoreceptor, 2 is a roller type contact charging device, 25 is a conductive roller, 25a is a shaft rod serving as a metal core thereof, and 25b is a conductive rubber material layer sheathed thereon. 0 12 3 4 5 6 7 8 (KV)
OXX)2X)WataruIB)'1JJED7Q)800':
ω(dacpno@i
Current I1 (Denbe,
Naka 1) Figure 5 (a) (b) Figure 1
Claims (5)
せて被帯電体面を帯電する接触式帯電装置であって、上
記導電性部材の少なくとも前記被帯電体面と当接する表
面材の材質をゴム硬度15〜80度、電気抵抗値10^
5〜10^6Ωの導電性ゴム材とした、ことを特徴とす
る帯電装置。(1) A contact charging device that charges the surface of a charged object by bringing a conductive member to which a voltage is applied into contact with the surface of the charged object, the material of at least the surface material of the conductive member that comes into contact with the surface of the charged object. Rubber hardness 15-80 degrees, electrical resistance value 10^
A charging device characterized by being made of a conductive rubber material with a resistance of 5 to 10^6 Ω.
硬度15〜80度、電気抵抗値10^5〜10^6Ωの
導電性ゴム材層とからなるローラ体であり、被帯電体面
に転動自由に或は非回転に接触させた、特許請求の範囲
第1項に記載の帯電装置。(2) The conductive member is a roller body consisting of a metal core and a conductive rubber layer wrapped around it with a rubber hardness of 15 to 80 degrees and an electrical resistance value of 10^5 to 10^6 Ω. The charging device according to claim 1, wherein the charging device is brought into rolling or non-rotating contact with the charging device.
ように構成された電源より供給する、特許請求の範囲第
1項又は第2項に記載の帯電装置。(3) The charging device according to claim 1 or 2, wherein the voltage applied to the conductive member is supplied from a power source configured to maintain a constant voltage.
分の合成よりなる、特許請求の範囲第3項に記載の帯電
装置。(4) The charging device according to claim 3, wherein the voltage applied to the conductive member is a combination of a DC component and an AC component.
感光体であり、該感光体面に潜像形成に先立って行う帯
電のための装置である、特許請求の範囲第1項に記載の
帯電装置。(5) The charging device according to claim 1, wherein the object to be charged is an amorphous silicon photoreceptor of an electrophotographic apparatus, and the charging device is a device for charging prior to forming a latent image on the surface of the photoreceptor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4384387A JPS63208878A (en) | 1987-02-26 | 1987-02-26 | Electric charger |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4384387A JPS63208878A (en) | 1987-02-26 | 1987-02-26 | Electric charger |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS63208878A true JPS63208878A (en) | 1988-08-30 |
Family
ID=12675017
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4384387A Pending JPS63208878A (en) | 1987-02-26 | 1987-02-26 | Electric charger |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS63208878A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5055879A (en) * | 1989-06-02 | 1991-10-08 | Compaq Computer Corporation | Apparatus for ozoneless efficient charging of a photoreceptive drum in an electrophotographic printer |
EP0541375A2 (en) * | 1991-11-06 | 1993-05-12 | Fujitsu Limited | Conductive foam rubber roller and an image formation apparatus using it |
EP0636949A2 (en) * | 1993-07-30 | 1995-02-01 | Canon Kabushiki Kaisha | Charging member, charging device and process cartridge detachably mountable to image forming apparatus |
US5619311A (en) * | 1993-05-31 | 1997-04-08 | Ricoh Company, Ltd. | Roller charging apparatus and image forming apparatus using the same |
US5732313A (en) * | 1995-07-31 | 1998-03-24 | Canon Kabushiki Kaisha | Charge apparatus and image forming apparatus |
US5797072A (en) * | 1995-08-21 | 1998-08-18 | Canon Kabushiki Kaisha | Apparatus and method for contact charging an amorphous silicon photoconductor via a mulipolar magnetic body having a magnetic brush layer |
US6226027B1 (en) | 1998-07-31 | 2001-05-01 | Oki Data Corporation | Electrophotography apparatus and exposing unit therefor |
US6272301B1 (en) | 1998-09-22 | 2001-08-07 | Canon Kabushiki Kaisha | Image forming apparatus featuring a rotatable electroconductive foam member |
US6332064B1 (en) | 1998-07-06 | 2001-12-18 | Oki Data Corporation | Image forming apparatus including a charging power supply and a neutralizing device |
US6576387B2 (en) | 2000-11-15 | 2003-06-10 | Canon Kabushiki Kaisha | Image-forming apparatus and image-forming method |
US6645688B2 (en) | 2000-11-15 | 2003-11-11 | Canon Kabushiki Kaisha | Image-forming apparatus and image-forming method |
-
1987
- 1987-02-26 JP JP4384387A patent/JPS63208878A/en active Pending
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5055879A (en) * | 1989-06-02 | 1991-10-08 | Compaq Computer Corporation | Apparatus for ozoneless efficient charging of a photoreceptive drum in an electrophotographic printer |
EP0541375A2 (en) * | 1991-11-06 | 1993-05-12 | Fujitsu Limited | Conductive foam rubber roller and an image formation apparatus using it |
US5619311A (en) * | 1993-05-31 | 1997-04-08 | Ricoh Company, Ltd. | Roller charging apparatus and image forming apparatus using the same |
US5765077A (en) * | 1993-07-30 | 1998-06-09 | Canon Kabushiki Kaisha | Charging member, charging device and process cartridge detachably mountable to image forming apparatus |
EP0636949A3 (en) * | 1993-07-30 | 1995-03-08 | Canon Kk | |
EP0636949A2 (en) * | 1993-07-30 | 1995-02-01 | Canon Kabushiki Kaisha | Charging member, charging device and process cartridge detachably mountable to image forming apparatus |
US5732313A (en) * | 1995-07-31 | 1998-03-24 | Canon Kabushiki Kaisha | Charge apparatus and image forming apparatus |
US5797072A (en) * | 1995-08-21 | 1998-08-18 | Canon Kabushiki Kaisha | Apparatus and method for contact charging an amorphous silicon photoconductor via a mulipolar magnetic body having a magnetic brush layer |
US6332064B1 (en) | 1998-07-06 | 2001-12-18 | Oki Data Corporation | Image forming apparatus including a charging power supply and a neutralizing device |
US6226027B1 (en) | 1998-07-31 | 2001-05-01 | Oki Data Corporation | Electrophotography apparatus and exposing unit therefor |
US6272301B1 (en) | 1998-09-22 | 2001-08-07 | Canon Kabushiki Kaisha | Image forming apparatus featuring a rotatable electroconductive foam member |
US6576387B2 (en) | 2000-11-15 | 2003-06-10 | Canon Kabushiki Kaisha | Image-forming apparatus and image-forming method |
US6645688B2 (en) | 2000-11-15 | 2003-11-11 | Canon Kabushiki Kaisha | Image-forming apparatus and image-forming method |
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