JPH05144544A - Corona electrode - Google Patents
Corona electrodeInfo
- Publication number
- JPH05144544A JPH05144544A JP30200891A JP30200891A JPH05144544A JP H05144544 A JPH05144544 A JP H05144544A JP 30200891 A JP30200891 A JP 30200891A JP 30200891 A JP30200891 A JP 30200891A JP H05144544 A JPH05144544 A JP H05144544A
- Authority
- JP
- Japan
- Prior art keywords
- wire
- oxide film
- electrode
- base material
- corona
- 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.)
- Granted
Links
Landscapes
- Electrostatic Separation (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、複写機、空気清浄器、
レーザープリンターなどに使用するコロナ電極に関し、
詳しくは、Ｗ線表面に安定なＷの酸化被膜が形成された
コロナ電極に関する。BACKGROUND OF THE INVENTION The present invention relates to a copying machine, an air purifier,
Regarding corona electrodes used in laser printers,
Specifically, it relates to a corona electrode having a stable W oxide film formed on the surface of a W line.
【０００２】[0002]
【従来の技術】Ｗはコロナ電極として多用されており、
近年複写機の多様化等に伴いコロナ電極にもそれに応じ
た特性が要求され種々の電極が開発されており、電解研
磨Ｗ線、ＡｕメッキＷ線、カーボンコートＷ線、Ｐｔク
ラッドＷ線、酸化被膜を形成させたＷ線等が使い分けさ
れている。特にＷの欠点である耐酸化性を向上させる手
段として、Ａｕメッキ、Ｐｔクラッド等を施したＷ線が
多用されているが、これらはコスト高となるためその使
用機種が限られる。酸化被膜Ｗ線は安価に得られるが、
従来の酸化被膜Ｗ線は紫色のまじった金色を呈している
ものが多く、コロナ電極として安定性に欠ける問題があ
った。2. Description of the Related Art W is often used as a corona electrode,
With the diversification of copiers in recent years, corona electrodes are required to have characteristics corresponding to them, and various electrodes have been developed. Electrolytic polishing W line, Au plating W line, carbon coat W line, Pt clad W line, oxidation The W line or the like on which the film is formed is used properly. In particular, as a means for improving the oxidation resistance, which is a drawback of W, W wire coated with Au plating, Pt clad, etc. is often used, but since these are costly, the models to be used are limited. Oxide film W wire can be obtained at low cost,
Many of the conventional oxide film W lines have a purple-colored gold color, and there is a problem that the corona electrode lacks stability.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、上記の問題
を解決し、コロナ電極として安定性に優れ、しかも安価
に得ることができ、多くの機種の電極として幅広く利用
することのできるコロナ電極を提供することを目的とす
る。DISCLOSURE OF THE INVENTION The present invention solves the above problems, has excellent stability as a corona electrode, can be obtained at low cost, and can be widely used as an electrode for many types of corona electrodes. The purpose is to provide.
【０００４】[0004]
【課題を解決するための手段】Ｗは、高温、多湿大気中
では容易に酸化が進み、酸化磨耗により線材の場合断線
に至るケースが見られる。コロナ電極の場合も細線で使
われ、雰囲気的にも種々のケースがあり、その雰囲気に
よって形成する酸化物の形態が異なる。そのためコロナ
電極の特性も使用雰囲気によって変わる。この現象を防
止するため予めＷの表面に安定な酸化被膜を強制的に形
成させるようにすれば、上記課題を解決するために極め
て有効であるという発見に基づいて本発明は完成され
た。[Means for Solving the Problems] In some cases, W is easily oxidized in a high temperature and high humidity atmosphere and is broken in the case of a wire due to oxidative wear. The corona electrode is also used as a thin wire, and there are various cases in terms of atmosphere, and the form of the oxide formed differs depending on the atmosphere. Therefore, the characteristics of the corona electrode also change depending on the use atmosphere. The present invention has been completed based on the finding that if a stable oxide film is forcibly formed in advance on the surface of W in order to prevent this phenomenon, it will be extremely effective for solving the above problems.
【０００５】すなわち、本発明のコロナ電極は、電極母
材としてのＷ線の表面に金色色調を呈してなるＷの酸化
被膜が形成されてなることを特徴とするものである。ま
た、本発明の好ましい態様において、前記Ｗ線の表面が
その表面粗さ（Ｒmax ）１μｍ以下に平滑化され、この
平滑化されたＷ線の表面に前記金色色調を呈してなるＷ
の酸化被膜が形成されてなるものとすることができる。That is, the corona electrode of the present invention is characterized in that a W oxide film having a gold color tone is formed on the surface of the W wire as an electrode base material. In a preferred embodiment of the present invention, the surface of the W line is smoothed to have a surface roughness (Rmax) of 1 μm or less, and the surface of the smoothed W line has the gold color tone.
The oxide film may be formed.
【０００６】発明の具体的説明 本発明において、電極母材としては耐熱性、機械的強度
に優れたＷ線を母材として用いる。コロナ電極は細線で
使用され、その線径は使用条件によっても異なるもので
あり適宜選択されるものであるが、φ６０〜９０μｍ程
度の範囲である。 Detailed Description of the Invention In the present invention, a W wire having excellent heat resistance and mechanical strength is used as an electrode base material. The corona electrode is used in the form of a fine wire, and its wire diameter varies depending on the use conditions and is appropriately selected, but it is in the range of about 60 to 90 μm.
【０００７】さらに、このＷ線の表面は、その表面粗さ
（Ｒmax ）が１μｍ以下に平滑化されていることが好ま
しい。このようにＷ線の表面が平滑化されていることに
より、その表面上に形成される酸化膜の表面状態も平滑
となり、より安定なコロナ放電が得られるとともに、ゴ
ミ等の異物の付着をより少なくすると同時に付着物の除
去も容易に行うことができる。なおここでＲmax （最大
高さ）というのは、断面曲線から基準長さだけ抜き取っ
た部分の平均線に平行な２曲線で抜き取り部分を挟んだ
とき、この２曲線の間隔を断面曲線の縦倍率の方向に測
定した値のことであり（ＪＩＳ Ｂ０６０１参照）、電
極線の断面曲線を模式的に示す図１においてＲmax で示
されるものである。Further, it is preferable that the surface roughness (Rmax) of the surface of the W line is smoothed to 1 μm or less. By smoothing the surface of the W line in this way, the surface condition of the oxide film formed on the surface is also smoothed, more stable corona discharge is obtained, and the adhesion of foreign matter such as dust is further improved. At the same time as reducing the amount, the deposit can be easily removed. Note that Rmax (maximum height) means here when the extracted portion is sandwiched by two curves parallel to the average line of the reference length extracted from the sectional curve, the interval between these two curves is the longitudinal magnification of the sectional curve. Value (see JIS B0601), which is represented by Rmax in FIG. 1, which schematically shows the sectional curve of the electrode wire.
【０００８】本発明のコロナ電極は、Ｗ線材の表面に金
色色調、特に輝度のある金色色調を呈してなるＷの酸化
被膜が形成されてなるが、この金色色調を呈してなるＷ
の酸化被膜は、従来の紫色のまじった金色を呈するＷの
酸化被膜に比べて安定性に優れている。この金色色調を
呈してなるＷの酸化被膜はその主成分はＷＯ2 であると
推定されるが成分比、結晶構造、被膜の厚さ等の詳細は
現在のところ必ずしも明らかではない。The corona electrode of the present invention is formed by forming an oxide film of W having a gold color tone, particularly a gold color tone having brightness, on the surface of the W wire material.
The oxide film of No. 2 is superior in stability to the conventional oxide film of W, which has a purple-colored, golden color. It is presumed that the main component of this W oxide film having a golden color tone is WO 2 , but details such as the component ratio, the crystal structure, and the thickness of the film are not always clear at present.
【０００９】このような金色色調を呈してなるＷの酸化
被膜を形成させる方法の一例を以下に説明する。まず、
Ｗ線をたとえば２〜５％ＮａＯＨ溶液中において電流密
度１０〜３０Ａ／ｄｍ2 程度で電解研磨を行い重量％で
１５〜２０％研磨してＷ線の表面を平滑化する。次い
で、大気中、ガス炎にて加熱してＷの酸化膜を形成させ
るのであるが、その加熱条件は、加熱手段としてはガス
加熱による加熱を行い、加熱温度、加熱時間は仕上がり
が金色になるような条件に設定する。具体的には、加熱
温度は６５０〜７５０℃の範囲とし、加熱時間は１〜１
０sec の範囲に設定する。ここで、上記線材の加熱の方
法としては、たとえば大気中、ガス炎にて加熱される加
熱炉に線材を連続的に通過させることにより、上記条件
の加熱を行うことが可能である。An example of a method for forming an oxide film of W having such a golden color tone will be described below. First,
The W wire is electrolytically polished in a 2 to 5% NaOH solution at a current density of about 10 to 30 A / dm 2 and then polished by 15 to 20% by weight to smooth the surface of the W wire. Then, in the atmosphere, it is heated by a gas flame to form an oxide film of W. The heating condition is that heating is performed by gas heating as a heating means, and the heating temperature and heating time result in a golden finish. Set such conditions. Specifically, the heating temperature is in the range of 650 to 750 ° C., and the heating time is 1 to 1
Set in the range of 0 sec. Here, as a method of heating the wire, it is possible to perform heating under the above conditions by continuously passing the wire through a heating furnace heated by a gas flame in the atmosphere.
【００１０】[0010]
【実施例】以下の実施例は本発明をさらに具体的に説明
するためのものである。本発明は以下の実施例によりそ
の範囲が限定されるものではない。EXAMPLES The following examples serve to explain the present invention more specifically. The scope of the present invention is not limited by the following examples.
【００１１】実施例１ 電極母材としてφ６５μｍのＷ線を用い、５％ＮａＯＨ
溶液中において直流２０Ａ／ｄｍ2 の電流密度での条件
でφ５９μｍまで電解研磨を行い重量％で約１８％研磨
してＷ線の表面を鏡面に仕上げた。次いで、大気中にお
いてガス炎にて、７００℃、２sec の加熱条件で酸化処
理を行い、輝度のある金色の酸化膜を形成させた。この
ようにして製造した線材の酸化後の表面状態は、酸化前
とほとんど変らずスムースな状態を呈していた（表面粗
さＲmax０．４μｍ）。 Example 1 A W wire having a diameter of 65 μm was used as an electrode base material, and 5% NaOH was used.
In the solution, electrolytic polishing was performed up to φ59 μm under the condition of a current density of DC 20 A / dm 2 and polishing was performed by about 18% by weight to finish the surface of the W line to a mirror surface. Then, an oxidation treatment was performed in a gas flame in the atmosphere under a heating condition of 700 ° C. for 2 seconds to form a bright golden oxide film. The surface condition of the wire thus manufactured after oxidation was almost the same as that before oxidation and exhibited a smooth condition (surface roughness Rmax 0.4 μm).
【００１２】実施例１の電極線および従来の酸化被膜Ｗ
電極線（６重量％研磨、表面粗さＲmax １．２μｍ）を
複写機に取付け、−５ｋＶの電圧をかけた状態で放電電
流を測定した結果を図２（ａ）、（ｂ）に示す。実施例
１の電極線では従来の酸化被膜Ｗ電極線に比べて放電電
流の変動幅が小さく良好な結果を示した。The electrode wire of Example 1 and the conventional oxide film W
Electrode wires (6% by weight polished, surface roughness Rmax 1.2 μm) were attached to a copying machine, and the discharge current was measured with a voltage of −5 kV applied. The results are shown in FIGS. 2 (a) and 2 (b). In the electrode wire of Example 1, the fluctuation range of the discharge current was smaller than that of the conventional oxide film W electrode wire, and a good result was shown.
【００１３】[0013]
【発明の効果】本発明のコロナ電極において、Ｗ線の表
面に形成される金色色調を呈してなるＷの酸化被膜は安
定であり、安定なコロナ放電を得ることができるととも
に価格的にも安価に得られるので、複写機、空気清浄
器、レーザープリンター等のコロナ電極として幅広く利
用することができる。INDUSTRIAL APPLICABILITY In the corona electrode of the present invention, the oxide film of W which is formed on the surface of the W wire and has a gold color tone is stable, and stable corona discharge can be obtained and the cost is low. Therefore, it can be widely used as a corona electrode for copying machines, air purifiers, laser printers and the like.
【図１】電極線の断面曲線の模式図。FIG. 1 is a schematic diagram of a sectional curve of an electrode wire.
【図２】実施例１の電極線と従来の酸化被膜Ｗ電極線に
おける放電電流と電極線の長手方向位置の関係を示すグ
ラフ。FIG. 2 is a graph showing the relationship between the discharge current and the position of the electrode wire in the longitudinal direction in the electrode wire of Example 1 and the conventional oxide film W electrode wire.
Claims (2)
呈してなるＷの酸化被膜が形成されてなるコロナ電極。1. A corona electrode in which a W oxide film having a gold color tone is formed on the surface of a W wire as an electrode base material.
１μｍ以下に平滑化され、この平滑化されたＷ線の表面
に前記金色色調を呈してなるＷの酸化被膜が形成されて
なる、請求項１に記載のコロナ電極。2. The surface of the W line has a surface roughness (Rmax)
The corona electrode according to claim 1, wherein the corona electrode is smoothed to 1 μm or less, and a W oxide film having the gold color tone is formed on the surface of the smoothed W line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30200891A JP3568543B2 (en) | 1991-11-18 | 1991-11-18 | Corona electrode, method of manufacturing the same, and copier, air purifier, and laser printer using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30200891A JP3568543B2 (en) | 1991-11-18 | 1991-11-18 | Corona electrode, method of manufacturing the same, and copier, air purifier, and laser printer using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05144544A true JPH05144544A (en) | 1993-06-11 |
| JP3568543B2 JP3568543B2 (en) | 2004-09-22 |
Family
ID=17903780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30200891A Expired - Lifetime JP3568543B2 (en) | 1991-11-18 | 1991-11-18 | Corona electrode, method of manufacturing the same, and copier, air purifier, and laser printer using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3568543B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1055972A2 (en) * | 1999-05-28 | 2000-11-29 | Canon Kabushiki Kaisha | Discharge wire, method of manufacturing discharge wire and electrification device |
| JP2005281041A (en) * | 2004-03-29 | 2005-10-13 | Nikko Materials Co Ltd | HEATER HAVING EXCELLENT PEST RESISTANCE AND COMPOSED ESSENTIALLY OF MoSi2 AND METHOD OF MANUFACTURING THE SAME |
| JP2009004269A (en) * | 2007-06-22 | 2009-01-08 | Toshiba Corp | Rhenium tungsten ribbon crimping component |
| JP2012053276A (en) * | 2010-09-01 | 2012-03-15 | Kyocera Mita Corp | Image forming apparatus |
-
1991
- 1991-11-18 JP JP30200891A patent/JP3568543B2/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1055972A2 (en) * | 1999-05-28 | 2000-11-29 | Canon Kabushiki Kaisha | Discharge wire, method of manufacturing discharge wire and electrification device |
| EP1055972A3 (en) * | 1999-05-28 | 2004-01-14 | Canon Kabushiki Kaisha | Discharge wire, method of manufacturing discharge wire and electrification device |
| US6917776B2 (en) | 1999-05-28 | 2005-07-12 | Canon Kabushiki Kaisha | Discharge wire, method of manufacturing discharge wire and electrification device |
| JP2005281041A (en) * | 2004-03-29 | 2005-10-13 | Nikko Materials Co Ltd | HEATER HAVING EXCELLENT PEST RESISTANCE AND COMPOSED ESSENTIALLY OF MoSi2 AND METHOD OF MANUFACTURING THE SAME |
| JP2009004269A (en) * | 2007-06-22 | 2009-01-08 | Toshiba Corp | Rhenium tungsten ribbon crimping component |
| JP2012053276A (en) * | 2010-09-01 | 2012-03-15 | Kyocera Mita Corp | Image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3568543B2 (en) | 2004-09-22 |
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