JPH0743981A - Corona electrifier for electrophotographic device - Google Patents

Corona electrifier for electrophotographic device

Info

Publication number
JPH0743981A
JPH0743981A JP18840593A JP18840593A JPH0743981A JP H0743981 A JPH0743981 A JP H0743981A JP 18840593 A JP18840593 A JP 18840593A JP 18840593 A JP18840593 A JP 18840593A JP H0743981 A JPH0743981 A JP H0743981A
Authority
JP
Japan
Prior art keywords
wires
shield plate
plate
corona
discharge
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.)
Withdrawn
Application number
JP18840593A
Other languages
Japanese (ja)
Inventor
Natsuki Kuribayashi
夏城 栗林
Tsutomu Maekawa
勉 前川
Akio Tsujita
明夫 辻田
Masanori Nakamura
正憲 中村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koki Holdings Co Ltd
Original Assignee
Hitachi Koki Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Koki Co Ltd filed Critical Hitachi Koki Co Ltd
Priority to JP18840593A priority Critical patent/JPH0743981A/en
Publication of JPH0743981A publication Critical patent/JPH0743981A/en
Withdrawn legal-status Critical Current

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  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Abstract

PURPOSE:To increase a corona current flowing through a photoreceptor by arranging a shield plate between respective wires and grounding the plate. CONSTITUTION:The electric discharge wires 2 and a metallic shield plate 3 are provided and the plate 3 is provided so as to surround three sides of the plural wires 2 arranged in parallel. Besides, the shield plate 4 is arranged between the respective wires 2. Then, the voltage of several kV is impressed on the wires 2 and the plate 4 is maintained to be at ground potential. When the voltage impressed on the wire 2 is gradually increased and an electric field on the surface of the wire 2 arrives at a discharge start electric field, electric discharge is generated. When the voltage is increased more, an electric discharge current is increased. By increasing the number of wires 2 and making a distance between the wire 2 and the plate 4 short, the electric discharge is apt to generate to obtain more corona currents even in the case of the size equal to that of a corona electrifier shown by figure.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、電子写真装置のコロナ
帯電器に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corona charger for an electrophotographic apparatus.

【0002】[0002]

【従来の技術】図5は一般に知られている電子写真装置
のコロナ帯電器を示す斜視図である。感光体1に対向し
て放電ワイヤ2が設けられており、放電ワイヤ2の感光
体対向面以外の3面を取り囲むようにして金属のシール
ド板3が設けられている。また、高速印刷用の電子写真
装置においては、図6の断面図に示すようにシールド板
3内に複数本の放電ワイヤ2を並列に配置したコロナ帯
電器が用いられている。
2. Description of the Related Art FIG. 5 is a perspective view showing a corona charger of a generally known electrophotographic apparatus. A discharge wire 2 is provided so as to face the photoconductor 1, and a metal shield plate 3 is provided so as to surround three faces of the discharge wire 2 other than the photoconductor-facing face. Further, in an electrophotographic apparatus for high speed printing, a corona charger in which a plurality of discharge wires 2 are arranged in parallel in a shield plate 3 is used as shown in the sectional view of FIG.

【0003】[0003]

【発明が解決しようとする課題】高速印刷用の電子写真
装置に用いられるコロナ帯電器は、上記したようにシー
ルド板3内に複数本の放電ワイヤ2を並列に配置して感
光体へ流入するコロナ電流の増大を図っていた。そのた
め、コロナ帯電器が大型化するという問題点があった。
In the corona charger used in the electrophotographic apparatus for high speed printing, a plurality of discharge wires 2 are arranged in parallel in the shield plate 3 and flow into the photoconductor as described above. I was trying to increase the corona current. Therefore, there is a problem that the corona charger becomes large.

【0004】従って、本発明の目的は、小型でかつ多く
のコロナ電流を得ることが可能なコロナ帯電器を提供す
ることにある。
Therefore, an object of the present invention is to provide a corona charger which is small in size and capable of obtaining a large corona current.

【0005】[0005]

【課題を解決するための手段】上記目的は、並列した複
数本のワイヤと、前記ワイヤを取り囲むシールド板から
構成される電子写真装置のコロナ帯電器において、前記
各ワイヤ間にシールド板を配置するとともに、前記各ワ
イヤ間のシールド板を接地することにより達成される。
In the corona charger of an electrophotographic apparatus, which comprises a plurality of wires arranged in parallel and a shield plate surrounding the wires, a shield plate is arranged between the wires. In addition, it is achieved by grounding the shield plate between the wires.

【0006】[0006]

【作用】上記構成によれば、各ワイヤ間にシールド板を
配置するとともに、前記各ワイヤ間のシールド板を接地
することにより、ワイヤとシールド板の間で電界が高く
なり、ワイヤ表面電界も高いため放電が起こりやすくな
り、大きなコロナ電流を得ることができる。
According to the above structure, by disposing the shield plate between the wires and grounding the shield plate between the wires, the electric field between the wires and the shield plate is increased, and the electric field on the wire surface is also high. Is likely to occur and a large corona current can be obtained.

【0007】[0007]

【実施例】以下、本発明の実施例を図面を参照して説明
する。図1は本発明となるコロナ帯電器の一実施例を示
す断面図である。2は放電ワイヤ、3は金属のシールド
板を示している。並列に配置された複数本の放電ワイヤ
2の3方を取り囲むようにしてシールド板3が設けられ
ており、それぞれの放電ワイヤ2の間にはシールド板4
が配置されている。放電ワイヤ2には数kVの電圧が印
加され、シールド板4はアース電位に保たれている。放
電ワイヤ2に印加した電圧を徐々に上げていくと、放電
ワイヤ2表面の電界が放電開始電界に達したときに放電
が起こる。更に、電圧を上げると放電電流が増大する。
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the corona charger according to the present invention. Reference numeral 2 is a discharge wire, and 3 is a metal shield plate. A shield plate 3 is provided so as to surround three sides of the plurality of discharge wires 2 arranged in parallel, and a shield plate 4 is provided between the respective discharge wires 2.
Are arranged. A voltage of several kV is applied to the discharge wire 2, and the shield plate 4 is kept at the ground potential. When the voltage applied to the discharge wire 2 is gradually increased, discharge occurs when the electric field on the surface of the discharge wire 2 reaches the discharge start electric field. Furthermore, when the voltage is increased, the discharge current increases.

【0008】また、図2に示すように、図1のコロナ帯
電器と同じ大きさであっても放電ワイヤ2の本数を増や
し放電ワイヤ2とシールド板4の距離を小さくすること
により、放電が起こりやすくなり、より多くのコロナ電
流を得ることができる。
Further, as shown in FIG. 2, even if the size is the same as that of the corona charger of FIG. 1, by increasing the number of discharge wires 2 and decreasing the distance between the discharge wires 2 and the shield plate 4, the discharge is generated. It is more likely to occur, and more corona current can be obtained.

【0009】図5及び図6は本発明となるコロナ帯電器
の他の実施例を示す断面図である。図5において、それ
ぞれの放電ワイヤ2の間に配置されたシールド板4は、
放電ワイヤ2を取り囲んでいる両端のシールド板3より
少し短くなっている。上記構成によれば、コロナ電流の
左右方向の拡がりを妨げないようにすることができる。
また、図6においては、放電ワイヤ2の間に配置された
シールド板4の先端がプラスチック5で形成されてい
る。上記構成によれば、プラスチック5の表面電位は上
昇するため、コロナ電流は回り込み感光体へ流入しやす
くなる。
5 and 6 are sectional views showing another embodiment of the corona charger according to the present invention. In FIG. 5, the shield plate 4 arranged between the respective discharge wires 2 is
It is a little shorter than the shield plates 3 at both ends surrounding the discharge wire 2. According to the above configuration, it is possible to prevent the lateral spread of the corona current from being obstructed.
Further, in FIG. 6, the tip of the shield plate 4 arranged between the discharge wires 2 is formed of plastic 5. According to the above configuration, since the surface potential of the plastic 5 rises, the corona current easily wraps around and flows into the photoconductor.

【0010】[0010]

【発明の効果】本発明によれば、各ワイヤ間にシールド
板を配置するとともに、前記各ワイヤ間のシールド板を
接地したので、感光体に流入するコロナ電流の増大を図
ることができる。
According to the present invention, since the shield plate is arranged between the wires and the shield plate between the wires is grounded, the corona current flowing into the photoconductor can be increased.

【図面の簡単な説明】[Brief description of drawings]

【図1】 本発明となるコロナ帯電器の一実施例を示す
断面図である。
FIG. 1 is a sectional view showing an embodiment of a corona charger according to the present invention.

【図2】 本発明となるコロナ帯電器の他の実施例を示
す断面図である。
FIG. 2 is a sectional view showing another embodiment of the corona charger according to the present invention.

【図3】 本発明となるコロナ帯電器の他の実施例を示
す断面図である。
FIG. 3 is a sectional view showing another embodiment of the corona charger according to the present invention.

【図4】 本発明となるコロナ帯電器の他の実施例を示
す断面図である。
FIG. 4 is a sectional view showing another embodiment of the corona charger according to the present invention.

【図5】 従来技術におけるコロナ帯電器を示す斜視図
である。
FIG. 5 is a perspective view showing a corona charger according to the related art.

【図6】 従来技術におけるコロナ帯電器を示す断面図
である。
FIG. 6 is a cross-sectional view showing a corona charger according to the related art.

【符号の説明】[Explanation of symbols]

1は感光体、2は放電ワイヤ、3、4はシールド板、5
はプラスチックである。
1 is a photoconductor, 2 is a discharge wire, 3 and 4 are shield plates, 5
Is plastic.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 中村 正憲 茨城県勝田市武田1060番地 日立工機株式 会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masanori Nakamura 1060 Takeda, Katsuta City, Ibaraki Prefecture Hitachi Koki Co., Ltd.

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 並列した複数本のワイヤと、前記ワイヤ
を取り囲むシールド板から構成される電子写真装置のコ
ロナ帯電器において、 前記各ワイヤ間にシールド板を配置するとともに、前記
各ワイヤ間のシールド板を接地したことを特徴とする電
子写真装置のコロナ帯電器。
1. A corona charger for an electrophotographic apparatus comprising a plurality of wires arranged in parallel and a shield plate surrounding the wires, wherein a shield plate is arranged between the wires and a shield between the wires is provided. A corona charger for an electrophotographic device, characterized in that the plate is grounded.
【請求項2】 前記各ワイヤ間のシールド板は、前記ワ
イヤを取り囲む両端のシールド板より短いことを特徴と
する請求項1記載の電子写真装置のコロナ帯電器。
2. A corona charger for an electrophotographic apparatus according to claim 1, wherein the shield plate between the wires is shorter than the shield plates at both ends surrounding the wire.
【請求項3】 前記各ワイヤ間のシールド板先端をプラ
スチックで形成したことを特徴とする請求項1記載の電
子写真装置のコロナ帯電器。
3. A corona charger for an electrophotographic apparatus according to claim 1, wherein the tip of the shield plate between the wires is formed of plastic.
JP18840593A 1993-07-29 1993-07-29 Corona electrifier for electrophotographic device Withdrawn JPH0743981A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18840593A JPH0743981A (en) 1993-07-29 1993-07-29 Corona electrifier for electrophotographic device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18840593A JPH0743981A (en) 1993-07-29 1993-07-29 Corona electrifier for electrophotographic device

Publications (1)

Publication Number Publication Date
JPH0743981A true JPH0743981A (en) 1995-02-14

Family

ID=16223076

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18840593A Withdrawn JPH0743981A (en) 1993-07-29 1993-07-29 Corona electrifier for electrophotographic device

Country Status (1)

Country Link
JP (1) JPH0743981A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150248080A1 (en) * 2014-03-03 2015-09-03 Konica Minolta, Inc. Wet-type developing device and wet-type image forming apparatus
CN109491223A (en) * 2017-09-12 2019-03-19 富士施乐株式会社 Charging unit and image forming apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150248080A1 (en) * 2014-03-03 2015-09-03 Konica Minolta, Inc. Wet-type developing device and wet-type image forming apparatus
US9383688B2 (en) * 2014-03-03 2016-07-05 Konica Minolta, Inc. Wet-type developing device and wet-type image forming apparatus with charging unit and neutralizing unit
CN109491223A (en) * 2017-09-12 2019-03-19 富士施乐株式会社 Charging unit and image forming apparatus
US10416587B2 (en) * 2017-09-12 2019-09-17 Fuji Xerox Co., Ltd. Auxiliary charging device for an image forming apparatus

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Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20001003