JPS63109473A - Discharging device - Google Patents

Abstract

PURPOSE:To electrostatically charge or destaticize selectively a part of a charged body by constituting a 2nd electrode of comb-like conductors divided into plural areas, arranging respective comb teeth so as to cross a 1st electrode and electrically selecting and connecting respective comb-like conductors in accordance with necessary charging width. CONSTITUTION:Charging current flowing from a solid discharging device 1 into the charged body 20 passes a current detecting circuit 33 built in a power supply 30 through the earth and flows into a rectifier circuit 32 and a detecting signal converted into a voltage value corresponding to the charging current is sent to an output control circuit 34. The output of the circuit 34 is sent to a power driving circuit 31 to control the current supply and a DC bias voltage is also changed by the circuit 32 by operating an AC voltage value applied between the 1st and 2nd electrodes 3, 4, so that the charging current can be accurately maintained at a prescribed value. When the set value of the charging current is changed by the circuit 33 or 34 in accordance with the number of connected conductive members at the time of connecting the 2nd electrode 4 with the power supply 30 in accordance with the required charging width, the value of the charging current in each unit length is fixedly controlled at the required charging band.

Description

【発明の詳細な説明】 （技術分野） 本発明は誘電体と、誘電体を介して配設された放電用第
１電極及び第２電極と、前記第１電極の近傍にイオンを
発生させるために、前記第１電極と第２電極との間に交
流電圧を印加する手段を有する放電装置に関する。この
種放電装置は、複写機、ファクシミリ等の静電記録装置
における除・帯電装置に応用され得る。Detailed Description of the Invention (Technical Field) The present invention includes a dielectric, a first electrode and a second electrode for discharging disposed through the dielectric, and a method for generating ions in the vicinity of the first electrode. The present invention relates to a discharge device having means for applying an alternating current voltage between the first electrode and the second electrode. This type of discharge device can be applied to a charge removal/charging device in an electrostatic recording device such as a copying machine or a facsimile machine.

（従来技術） 複写機、ファクシミリ等の静電記録装置（電子写真装置
）の除・帯電器等として、従来使用されていた細線型コ
ロナ放電器に代わって板状の固体放電装置の実用化が計
られている。(Prior art) A plate-shaped solid-state discharge device has been put into practical use in place of the thin wire type corona discharger that was conventionally used as a charge remover and charger for electrostatic recording devices (electrophotographic devices) such as copying machines and facsimiles. It is measured.

ところで、電子写真装置においては、光導電感光体面を
露光前に均一帯電させる必要があるが、転写紙領域外に
まで帯電させれば、未転写トナー像が感光体状に残り、
現像剤（トナー）の浪費と残留トナーのクリーニング負
荷が増大して好ましくない。この対策として転写紙に合
わせた帯電巾を可変選択する方法が種々捷案されている
が、帯型中を分割して必要巾に応じて分割部を接続する
方法においては、接続部の帯電電位の均一化が困難で実
用化を阻害している。By the way, in an electrophotographic apparatus, it is necessary to uniformly charge the surface of a photoconductive photoreceptor before exposure, but if the area outside the transfer paper area is charged, an untransferred toner image will remain on the photoreceptor.
This is undesirable because it wastes developer (toner) and increases the burden of cleaning residual toner. As a countermeasure against this, various methods have been devised in which the charging width is variably selected according to the transfer paper, but in the method of dividing the strip and connecting the divided parts according to the required width, the charging potential of the connecting part It is difficult to achieve uniformity, which hinders practical application.

帯電巾を可変選択する従来例としては、第２電極を用紙
サイズに合わせて複数分割し、各電極毎に交流印加用電
源が印加できるようにしたもの、あるいは複写サイズに
応じた複数の第１電極を有し、所望の帯電巾に応じて第
１を極を選択的に電源に接続するもの、等が公知となっ
ている。Conventional examples of variably selecting the charging width include splitting the second electrode into multiple parts according to the paper size and applying AC power to each electrode, or splitting the second electrode into multiple parts according to the paper size, or dividing the second electrode into multiple parts according to the copy size. A device having electrodes and having a first electrode selectively connected to a power source according to a desired charging width is known.

しかし前者においては、第２電極は分割部で帯電むらが
生じないように、階段状に形成されており、均一に帯電
させるためには第１電極が複数本必要となり、また後者
においては第１電極が複数本必要となるなどそれぞれ不
具合を生じていた。However, in the former, the second electrode is formed in a step-like manner to prevent uneven charging at the divided portion, and multiple first electrodes are required to charge uniformly. Each method had its own problems, such as the need for multiple electrodes.

また上記従来例は共に電極を切り換えた時の、を源への
負荷変化が考慮されていない。即ち、電極を切り換えて
電源に接続しただけでは放電状態が変わってしまい、規
定の帯電電位が得られないという欠点があった。Further, in both of the above conventional examples, changes in the load on the source when switching the electrodes are not taken into consideration. That is, simply switching the electrodes and connecting them to a power source changes the discharge state, resulting in a drawback that a specified charging potential cannot be obtained.

（目的） 本発明はこの様な背景に基づいてなされたものであり、
上述した従来例の欠点をなくし、被帯電体の一部を選択
的に（例えば用紙サイズに合わせて）帯電又は除電が可
能な放電装置を提供することを目的とする。(Purpose) The present invention was made based on this background,
It is an object of the present invention to provide a discharge device that can eliminate the drawbacks of the conventional examples described above and selectively charge or remove electricity from a part of a charged object (for example, depending on the paper size).

（構成） 従来の固体放電素子はその誘電体材質の微少部分の電気
的不均一さが、帯電電位を不均一にする原因となる性質
があり、この対策として本発明はイオン発生電極を櫛状
にして強制的に櫛状ｔｉ端部に放電開始点を設定させる
ことで均一化を計ろうとするものである。櫛歯のピッチ
と被帯電体までの放電距翔との選択により櫛歯ピッチに
対応ずした停電ムラを無視できる状態にすることができ
る。(Structure) Conventional solid-state discharge elements have a property that electrical non-uniformity in minute parts of the dielectric material causes non-uniform charging potential.As a countermeasure to this, the present invention has a comb-shaped ion generating electrode. This attempts to achieve uniformity by forcibly setting the discharge starting point at the comb-shaped Ti end. By selecting the pitch of the comb teeth and the discharge distance to the object to be charged, it is possible to create a state in which power outage unevenness that does not correspond to the pitch of the comb teeth can be ignored.

以下、本発明を図面に基づき説明する。Hereinafter, the present invention will be explained based on the drawings.

第１図は本発明例の一実施例に係る固体放電装置、被帯
電体の全体構成図、第２図は第１図のＡ−ＡＦｒＩＡ断
面と被帯電体を示す。第３図は固体放電装置を平行に配
置した例を示す図、第４図は第１電極を架線とした例を
示す図、第５図、第６図。FIG. 1 is an overall configuration diagram of a solid-state discharge device and a charged object according to an embodiment of the present invention, and FIG. 2 shows a cross section of A-AFrIA in FIG. 1 and the charged object. FIG. 3 is a diagram showing an example in which solid-state discharge devices are arranged in parallel, FIG. 4 is a diagram showing an example in which the first electrode is an overhead wire, and FIGS. 5 and 6.

第７図、第８図は放電装置の他の形態例を示す図、第９
図は第８図Ａ−Ａ線断面図である。7 and 8 are diagrams showing other embodiments of the discharge device, and FIG.
The figure is a sectional view taken along the line A--A in FIG.

まず第１図、第２図に基づいて説明する。First, explanation will be given based on FIGS. 1 and 2.

固体放電装置１は、絶縁体基板２と放電用第１電極３と
イオン発生用第２電極４と誘電体５からなり、第２Ｎ、
極４は第１図に示す如く、複数領域に分割された櫛歯状
導電体で、櫛歯は第１放電電極３と交差して設けられて
いる。第１電極３は最大帯電巾全長以上の連続したｍ線
状である。The solid state discharge device 1 consists of an insulating substrate 2, a first electrode 3 for discharge, a second electrode 4 for ion generation, and a dielectric 5, and includes a second N,
As shown in FIG. 1, the pole 4 is a comb-shaped conductor divided into a plurality of regions, and the comb teeth are provided to intersect with the first discharge electrode 3. The first electrode 3 has a continuous m-line shape with a maximum charging width of more than the entire length.

第２電極４は最小帯電巾に対応する導電体４ａ、その−
側に、各紙中に対応した導電体４ｂ、４ｃを設けて構成
される。The second electrode 4 includes a conductor 4a corresponding to the minimum charging width, and its −
It is constructed by providing conductors 4b and 4c corresponding to each paper on the side.

この時４ａ、４ｂ間（６ａ）４ｂ、４ｃ間（６ｂ）を櫛
歯の隙間と略同じに設定し、放電電極３は最大中以上の
継目のない細線にすることで、継目の帯電電位ムラは実
用上無視できる。At this time, the gap between 4a and 4b (6a) and the gap between 4b and 4c (6b) are set to be approximately the same as the gap between the comb teeth, and the discharge electrode 3 is made of a seamless thin wire with a diameter of at least medium, thereby reducing unevenness in the charging potential at the seam. can be ignored in practice.

常に帯電電位を一定電位にするために、電源は定電圧電
源を用いれば、帯電巾を変化させることによる負荷変動
に対して自動的に電流が制御され、好ましい。然し環境
変動による帯電電流の変化を修正する機能を持つ定電流
電源を用いた場合は、帯電中の変化で帯電電流は制御さ
れない。In order to always keep the charging potential at a constant potential, it is preferable to use a constant voltage power source as the current is automatically controlled in response to load fluctuations caused by changing the charging width. However, when a constant current power supply having a function of correcting changes in charging current due to environmental changes is used, the charging current is not controlled by changes during charging.

固体放電装置１から被帯電体２０に流れる帯電電流は、
アースを経て、電源３０に組み込まれた電流検出回路３
３を通り、整流回路３２に流れる。The charging current flowing from the solid state discharge device 1 to the charged object 20 is
Current detection circuit 3 built into power supply 30 via ground
3 and flows to the rectifier circuit 32.

電流検出回路３３からは、帯電電流に対応した電圧値に
変換された検出信号が出力され、検出信号が設定値にな
っているかどうかを判断する出力制御回路３４に送られ
る。出力制御回路３４の出力は、パワードライブ回路３
１に送られ、パワードライブ回路３１の通電量を制御し
、第１電掻３と第２ｔｆｉ４の間に印加される交流電圧
値を操作することによって、直流バイアス電圧も整流回
路３２で変化し、高精度に帯電電流を所定値に維持する
。The current detection circuit 33 outputs a detection signal converted into a voltage value corresponding to the charging current, and sent to the output control circuit 34 which determines whether the detection signal is at a set value. The output of the output control circuit 34 is transmitted to the power drive circuit 3.
By controlling the amount of current supplied to the power drive circuit 31 and manipulating the AC voltage value applied between the first electric scraper 3 and the second TFI 4, the DC bias voltage is also changed by the rectifier circuit 32. Maintain charging current at a predetermined value with high precision.

ここで、所望の帯電巾に合わせて第２電掻４を電ａ３０
に接続した時、接続された導電部材の数に合わせて、電
流検出回路３３または出力制御回路３４で帯電電流の設
定値を変え、所望の帯電巾において、単位長さ当たりの
帯電電流の値が一定となるように制御される。Here, the second electric scraper 4 is connected to the electric A30 according to the desired charging width.
, the charging current setting value is changed in the current detection circuit 33 or the output control circuit 34 according to the number of connected conductive members, and the charging current value per unit length is determined at the desired charging width. It is controlled to be constant.

尚、第１図には、片側だけ第２電極４を３分割した例を
示したが、これは２分割又は更に多数に分割しても良く
、又、帯状のどうで部材（各櫛歯）がそれぞれ独立して
電源に接続される構成としても良い。又中央基準の作像
システムにおいては両端骨に分割電極を設ける。Although FIG. 1 shows an example in which the second electrode 4 is divided into three parts on one side, it may be divided into two parts or even more parts. The configuration may be such that each of the two is independently connected to the power source. In a central reference imaging system, split electrodes are provided on both ends of the bone.

第２図には、固体放電装置１を被帯電体２０に対して立
てて配設した例を示したが、第３図の様に被帯電体に対
して平行に配設しても良い。Although FIG. 2 shows an example in which the solid-state discharge device 1 is arranged vertically with respect to the object to be charged 20, it may be arranged parallel to the object to be charged as shown in FIG.

第１図乃至第３図までは第１電極３が誘電体５上に固定
して配設された固体放電装置を示したが、第４図に示す
様に、第１電極３が架線された放電装置１０としても良
い、尚、第４図には、放電装置１０を被帯電体２０に対
して立てて配設した例を示したが、放電装置１０を被帯
電体２０に平行に配設しても良い。Although FIGS. 1 to 3 show solid-state discharge devices in which the first electrode 3 is fixedly disposed on the dielectric 5, as shown in FIG. The discharge device 10 may also be used. Although FIG. 4 shows an example in which the discharge device 10 is arranged vertically with respect to the charged object 20, it is also possible to arrange the discharge device 10 parallel to the charged object 20. You may do so.

第５〜第９図には放電装置の他の形態例を示す。5 to 9 show other embodiments of the discharge device.

第５図は、帯状の導電部材を各々２カ所で接続して第２
電極４とした例である。第６図は、帯状の導電部材を中
央部で接続して、第２電極４とし、第１電極３を２本配
設した例である。FIG.
This is an example in which electrode 4 is used. FIG. 6 shows an example in which band-shaped conductive members are connected at the center to form the second electrode 4, and two first electrodes 3 are provided.

第７図は、第１電極３を第２電極４より外側に設けた例
である。FIG. 7 shows an example in which the first electrode 3 is provided outside the second electrode 4.

第８図は、第１電極３を固体放電装置１の長手端面に設
けた例である。FIG. 8 shows an example in which the first electrode 3 is provided on the longitudinal end surface of the solid state discharge device 1.

第９図は第８図の固体放電装置１のＡＡにおける断面を
示した図である。FIG. 9 is a diagram showing a cross section along AA of the solid state discharge device 1 of FIG. 8.

第５図乃至第９図において、第１電極３を誘電体上に固
定して固体放電装置１としても、第１電極３を架線して
放電装置１０として使用しても良い。In FIGS. 5 to 9, the first electrode 3 may be fixed on a dielectric material to serve as the solid state discharge device 1, or the first electrode 3 may be used as the discharge device 10 by using an overhead wire.

第５図乃至第９図においても、第２電極４は所望の除・
帯電巾に合わせて分割され選択的に電源が接続される。Also in FIGS. 5 to 9, the second electrode 4 is
It is divided according to the charging width and the power supply is selectively connected.

（効果） 本発明は以上述べたとおりのものであり、本発明に係る
放電装置を使用することにより、被帯電体の一部を所望
の除・帯電巾で選択的に除・帯電巾を行うことができる
。(Effects) The present invention is as described above, and by using the discharge device according to the present invention, a part of the charged object can be selectively removed and charged within a desired range. be able to.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明例の一実施例に係る固体放電装置、被帯
電体の全体構成図、第２図は第１図の八−Ａ線断面と被
帯電体を示す。第３図は固体放電装置を平行に配置した
例を示す図、第４図は第１電極を架線とした例を示す図
、第５図、第６図。 第７図、第８図は放電装置の他の形態例を示す図、第９
図は第８図Ａ−ＡｖＡ断面図である。 ３・・・第１電極、４・・・第２電極、５・・・誘電体
。 第１図 第４図 第５図 第６図FIG. 1 is an overall configuration diagram of a solid-state discharge device and a charged object according to an embodiment of the present invention, and FIG. 2 shows a cross section taken along line 8-A in FIG. 1 and the charged object. FIG. 3 is a diagram showing an example in which solid-state discharge devices are arranged in parallel, FIG. 4 is a diagram showing an example in which the first electrode is an overhead wire, and FIGS. 5 and 6. 7 and 8 are diagrams showing other embodiments of the discharge device, and FIG.
The figure is a sectional view taken along line A-AvA in FIG. 3... First electrode, 4... Second electrode, 5... Dielectric. Figure 1 Figure 4 Figure 5 Figure 6

Claims (3)

【特許請求の範囲】[Claims] （１）誘電体と、誘電体を介して配設された放電用第１
電極及び第２電極と、前記第１電極の近傍にイオンを発
生させるために、前記第１電極と第２電極との間に交流
電圧を印加する手段を有する放電装置において、前記第
２電極は、複数領域に分割された櫛歯状導電体で構成し
、各櫛歯は前記第１電極と交差する様に配設し、各櫛歯
状導電体を、必要帯電巾に合わせて電気的に選択接続す
るようにしたことを特徴とする放電装置。(1) A dielectric and a discharge first disposed through the dielectric.
In a discharge device comprising an electrode, a second electrode, and means for applying an alternating current voltage between the first electrode and the second electrode in order to generate ions in the vicinity of the first electrode, the second electrode , is composed of a comb-shaped conductor divided into a plurality of regions, each comb-shaped conductor is arranged so as to intersect with the first electrode, and each comb-shaped conductor is electrically connected according to the required charging width. A discharge device characterized by being selectively connected. （２）帯電巾に応じて、帯電電流値を制御するようにし
たことを特徴とする特許請求の範囲第（１）項記載の放
電装置。(2) The discharge device according to claim (1), wherein the charging current value is controlled according to the charging width. （３）放電用第１電極は最大帯電巾に渡つて継目のない
電極であることを特徴とする特許請求の範囲第（１）項
記載の放電装置。(3) The discharge device according to claim (1), wherein the first electrode for discharge is a seamless electrode over the maximum charging width.