JP3568543B2 - Corona electrode, method of manufacturing the same, and copier, air purifier, and laser printer using the same - Google Patents
Corona electrode, method of manufacturing the same, and copier, air purifier, and laser printer using the same Download PDFInfo
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- JP3568543B2 JP3568543B2 JP30200891A JP30200891A JP3568543B2 JP 3568543 B2 JP3568543 B2 JP 3568543B2 JP 30200891 A JP30200891 A JP 30200891A JP 30200891 A JP30200891 A JP 30200891A JP 3568543 B2 JP3568543 B2 JP 3568543B2
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- corona electrode
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Description
【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。
【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。
【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。
【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。
【０００５】
すなわち、本発明のコロナ電極は、電極母材としてのＷ線を電解研磨により表面粗さ（Ｒｍａｘ）を１μｍ以下に平滑化した後、大気中ガス炎にて６５０〜７５０℃、１〜１０秒の加熱処理をすることにより、表面に金色色調を呈するＷの酸化被膜が形成されていることを特徴とするものである。
また、本発明のコロナ電極の製造方法は、電極母材としてのＷ線の表面を電解研磨により表面粗さ（Ｒｍａｘ）を１μｍ以下に平滑化した後、大気中ガス炎にて６５０〜７５０℃、１〜１０秒の加熱条件で加熱し、金色色調を呈してなるＷの酸化被膜を形成することを特徴とするものである。
【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。
【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。
【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。
【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、その過熱条件は、過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１〜１０ｓｅｃ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、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。
【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。
【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Ｒｍａｘ ０．４μｍ）。
【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。
【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。
【図面の簡単な説明】
【図１】電極線の断面曲線の模式図。
【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。[0001]
[Industrial applications]
The present invention relates to a corona electrode used for a copying machine, an air purifier, a laser printer, and the like, and more particularly, to a corona electrode having a stable W oxide film formed on a W line surface.
[0002]
[Prior art]
W is widely used as a corona electrode. In recent years, with the diversification of copiers and the like, the corona electrode is required to have characteristics corresponding thereto, and various electrodes have been developed. Electrolytic polishing W line, Au-plated W line, carbon A coated W line, a Pt clad W line, a W line on which an oxide film is formed, and the like are selectively used. In particular, as a means for improving the oxidation resistance, which is a drawback of W, W lines coated with Au plating, Pt cladding, or the like are often used. However, these are expensive and their use models are limited. Oxide-coated W lines can be obtained at low cost, but conventional oxide-coated W lines often have a purple-colored golden color, and have a problem of lacking stability as a corona electrode.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to solve the above-mentioned problems, and to provide a corona electrode that has excellent stability as a corona electrode, can be obtained at low cost, and can be widely used as an electrode of many types.
[0004]
[Means for Solving the Problems]
W is easily oxidized in a high-temperature, high-humidity atmosphere, and in some cases, the wire is broken 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 vary 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 is extremely effective to solve the above problems.
[0005]
That is, the corona electrode of the present invention, after smoothing the surface roughness (Rmax) to 1 μm or less by electrolytic polishing of a W line as an electrode base material, is subjected to 650 to 750 ° C. for 1 to 10 seconds with an atmospheric gas flame. By performing the heat treatment described above, an oxide film of W exhibiting a golden color tone is formed on the surface.
Further, in the method for producing a corona electrode of the present invention, the surface of a W line as an electrode base material is smoothed to a surface roughness (Rmax) of 1 μm or less by electrolytic polishing, and then 650 to 750 ° C. with an atmospheric gas flame. It is characterized in that it is heated under a heating condition of 1 to 10 seconds to form an oxide film of W having a golden color tone.
[0006]
Detailed description of the invention In the present invention, a W wire having excellent heat resistance and mechanical strength is used as a base material of an electrode. The corona electrode is used in the form of a thin wire, and the wire diameter varies depending on the use conditions and is appropriately selected, but is in the range of about φ60 to 90 μm.
[0007]
Further, the surface of the W line is preferably smoothed to have a surface roughness (Rmax) of 1 μm or less. Since the surface of the W line is smoothed in this way, the surface state of the oxide film formed on the surface is also smoothed, and a more stable corona discharge can be obtained, and the adhesion of foreign substances such as dust can be reduced. At the same time, attachment can be easily removed. Here, Rmax (maximum height) means the distance between the two curves parallel to the average line of the portion extracted by the reference length from the cross-sectional curve, and the interval between the two curves is the longitudinal magnification of the cross-sectional curve. (See JIS B0601), which is indicated by Rmax in FIG. 1 schematically showing a cross-sectional curve of an electrode wire.
[0008]
The corona electrode of the present invention is formed by forming an oxide film of W having a golden color tone, particularly a bright golden color tone, on the surface of a W wire rod. Is superior in stability to the oxide film of W which exhibits a purple-colored golden color. It is presumed that the main component of the oxide film of W having the 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]
An example of a method for forming an oxide film of W having such a golden tone will be described below. First, the W line is electropolished in a 2 to 5% NaOH solution at a current density of about 10 to 30 A / dm 2 , and is polished by 15 to 20% by weight to smooth the surface of the W line. Then, in the atmosphere, it is heated by a gas flame to form an oxide film of W. As for the overheating condition, heating by gas heating is performed as a heating means, and the heating temperature and heating time become golden in the finish. Set to such conditions. Specifically, the heating temperature is set in a range of 650 to 750 ° C., and the heating time is set in a range of 1 to 10 sec. Here, as a method of heating the wire is in the atmosphere, by continuously passing the wire in a heating furnace to be heated by gas flames, it is possible to perform heating under the above conditions.
[0010]
【Example】
The following examples are provided to further illustrate the present invention. The scope of the present invention is not limited by the following examples.
[0011]
Example 1
Using a W line of φ65 μm as an electrode base material, electropolishing is performed to φ59 μm in a 5% NaOH solution under a current density of DC 20 A / dm 2 , and the surface of the W line is mirror-polished by polishing about 18% by weight%. Finished. Next, an oxidation treatment was performed in a gas flame in the atmosphere under heating conditions of 700 ° C. and 2 sec to form a bright gold oxide film. The surface state of the thus manufactured wire rod after oxidation was almost the same as before oxidation and exhibited a smooth state (surface roughness Rmax 0.4 μm).
[0012]
The electrode wire of Example 1 and the conventional oxide-coated W electrode wire (polished at 6% by weight, surface roughness Rmax 1.2 μm) were attached to a copying machine, and the results of measuring the discharge current with a voltage of −5 kV applied were obtained. 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]
【The invention's effect】
In the corona electrode of the present invention, the oxide film of W having a golden color tone formed on the surface of the W line is stable, and can obtain a stable corona discharge and can be obtained at a low price. It can be widely used as a corona electrode for copiers, air purifiers, laser printers and the like.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a cross-sectional curve of an electrode wire.
FIG. 2 is a graph showing the relationship between the discharge current and the longitudinal position of the electrode wire of Example 1 and a conventional oxide film W electrode wire.
Claims (5)
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 JPH05144544A (en) | 1993-06-11 |
| JP3568543B2 true 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) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3619057B2 (en) | 1999-05-28 | 2005-02-09 | キヤノン株式会社 | Charging device and image forming apparatus |
| JP4823486B2 (en) * | 2004-03-29 | 2011-11-24 | Ｊｘ日鉱日石金属株式会社 | Heater mainly composed of MoSi2 having excellent pest resistance and method for producing the same |
| JP5016992B2 (en) * | 2007-06-22 | 2012-09-05 | 株式会社東芝 | Rhenium tungsten ribbon caulking parts |
| 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
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05144544A (en) | 1993-06-11 |
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