JPH0895273A - Production of aluminum tube for photosensitive drum - Google Patents
Production of aluminum tube for photosensitive drumInfo
- Publication number
- JPH0895273A JPH0895273A JP6233520A JP23352094A JPH0895273A JP H0895273 A JPH0895273 A JP H0895273A JP 6233520 A JP6233520 A JP 6233520A JP 23352094 A JP23352094 A JP 23352094A JP H0895273 A JPH0895273 A JP H0895273A
- Authority
- JP
- Japan
- Prior art keywords
- aluminum
- cutting
- tube
- photosensitive drum
- aluminum tube
- 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
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- Photoreceptors In Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、レーザープリンタ
ー、ＬＥＤプリンター、液晶プリンター、レーザーファ
クシミリ、複写機等の電子写真装置の感光ドラムとして
用いられるアルミニウム管の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an aluminum tube used as a photosensitive drum of an electrophotographic apparatus such as a laser printer, an LED printer, a liquid crystal printer, a laser facsimile and a copying machine.
【０００２】なお、この明細書において、アルミニウム
の語はアルミニウム及びアルミニウム合金の両方を含む
意味で用いる。In this specification, the term aluminum is used to include both aluminum and aluminum alloys.
【０００３】[0003]
【従来の技術及び解決しようとする課題】一般に、電子
写真用の感光ドラムはアルミニウム基体の表面に感光層
が被覆されたものに構成されるが、かかる感光層として
セレン等の無機系光導電材料に代えて有機物系材料を用
いた有機感光体（いわゆるＯＰＣ感光体）が、成膜性、
軽量性、低価格性等の面で優れているところから用いら
れるようになっている。2. Description of the Related Art Generally, a photosensitive drum for electrophotography is constituted by an aluminum substrate having a surface covered with a photosensitive layer. As the photosensitive layer, an inorganic photoconductive material such as selenium is used. The organic photoconductor using an organic material (so-called OPC photoconductor) instead of
It has come to be used because it is superior in terms of lightness and low cost.
【０００４】そして、有機感光体の機能、特性を更に向
上させるために、近時、感光層を電荷発生層（ＣＧＬ）
と電荷輸送層（ＣＴＬ）を有するものに構成した積層型
の有機感光体が提供されている。そして、高感度の積層
型感光ドラムを得るため、前記電荷発生層を０．２〜
０．３μｍの薄膜に塗工することも行われるようになっ
てきている。Recently, in order to further improve the function and characteristics of the organic photoreceptor, the photosensitive layer is recently replaced with a charge generation layer (CGL).
And a charge transporting layer (CTL). Then, in order to obtain a high-sensitivity layered photosensitive drum, the charge generation layer is
It has also come to be applied to a thin film of 0.3 μm.
【０００５】ところで、感光ドラム表面に一様帯電させ
る方法に関して、従来はコロナ帯電方式が採用されてい
たが、オゾンの発生を伴うという問題があるため、ロー
ラー帯電、ブラシ帯電等の直接帯電方式が多く採用され
るようになってきた。By the way, as a method for uniformly charging the surface of the photosensitive drum, a corona charging method has been conventionally used, but since there is a problem that ozone is generated, a direct charging method such as roller charging or brush charging is used. It has come to be adopted many times.
【０００６】しかし、直接帯電方式では、従来のコロナ
帯電の際に絶縁層として働いていた空気層がなくなるた
め、感光ドラムへの負荷が大きくなり、アルミニウム管
表面の局部的かつ微細な凸部を起点としてリーク（漏
電）が発生し、感光層を焼損させるという不都合が生じ
ている。このため、直接帯電方式を採用しても、一様帯
電の際にリークが発生しないように、表面に凸状欠陥の
ないアルミニウム基体が望まれている。However, in the direct charging method, since the air layer that worked as an insulating layer at the time of conventional corona charging is eliminated, the load on the photosensitive drum is increased, and local and minute convex portions on the surface of the aluminum tube are formed. Leakage (electric leakage) occurs as a starting point, which causes a problem that the photosensitive layer is burned out. Therefore, even if the direct charging method is adopted, there is a demand for an aluminum substrate having no convex defects on the surface so that leakage does not occur during uniform charging.
【０００７】もとより、アルミニウム管の表面を電荷発
生層の厚み以下の表面粗さとなるように高精度で鏡面切
削することによって、リークを防止可能な平滑性を確保
することはできるが、このような鏡面仕上げは精度と熟
練を要することから時間がかかると共にコスト高につく
という問題があった。Of course, it is possible to secure smoothness capable of preventing leakage by mirror-cutting the surface of the aluminum tube with a high precision so that the surface roughness is equal to or less than the thickness of the charge generation layer. Since mirror finishing requires precision and skill, there is a problem that it takes time and is costly.
【０００８】この発明は、このような技術的背景に鑑み
てなされたものであって、高精度な鏡面切削を必要とす
ることなく表面の微細凸部を抑制し、これによって直接
帯電方式による感光ドラムの一様帯電の際のリークを防
止し得る感光ドラム用アルミニウム管の製作提供を目的
とする。The present invention has been made in view of the above technical background, and suppresses fine projections on the surface without the need for highly accurate mirror surface cutting, thereby exposing the light by the direct charging method. It is an object of the present invention to manufacture and provide an aluminum tube for a photosensitive drum, which can prevent leakage during uniform charging of the drum.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
に、この発明は、アルミニウム引抜管の表面を、Ｒmax
（最大高さ）０．５〜３μｍに切削したのち、表面にバ
ニシング加工を施すことを特徴とする感光ドラム用アル
ミニウム管の製造方法を要旨とする。In order to achieve the above object, the present invention provides a surface of an aluminum drawn tube with Rmax.
(Summary) A method for manufacturing an aluminum tube for a photosensitive drum is characterized in that after cutting to a maximum height of 0.5 to 3 μm, the surface is burnished.
【００１０】この発明において、アルミニウム引抜管を
用いるのは、アルミニウム管を引抜くことによってある
程度良好な表面粗さを得ることができ、引抜後に行う切
削加工をより簡易にかつ短時間にするためである。一般
には、アルミニウム押出管を引抜いて得られたものが用
いられる。なお、引抜ダイスとしてベアリング長さの短
い特殊なものを用いることにより、引抜き後の表面粗さ
をさらに高精度にした無切削ＥＤ管が存在するが、この
表面にはササクレ状の微細突起が存在し、引抜きのまま
では前記微細突起を起点としてやはりリークが生じてし
まう。In the present invention, the aluminum drawn tube is used in order to obtain a certain degree of good surface roughness by drawing the aluminum tube and to make the cutting process after drawing easier and shorter. is there. Generally, the one obtained by pulling out an aluminum extruded tube is used. In addition, there is a non-cutting ED tube that has a more precise surface roughness after drawing by using a special drawing die with a short bearing length, but there are crispy fine protrusions on this surface. However, if it is still drawn out, a leak will still occur starting from the fine protrusions.
【００１１】引抜後に施す切削は、アルミニウム管の表
面がＲmax ０．５〜３μｍの粗さとなるように行う。Ｒ
max ０．５μｍ未満の表面粗さとなるまで切削を行うと
加工に手間を要するとともに、切削の困難性が増大する
からである。一方、Ｒmax ３μｍを越える表面粗さで
は、後述するバニシング加工を行っても微細な凸部が平
坦化されにくく、感光ドラムに適用したときにこの凸部
においてリークを生じてしまうからである。切削によっ
て得るべき特に好ましい表面粗さの上限値はＲmax ２μ
ｍである。The cutting performed after drawing is performed so that the surface of the aluminum tube has a roughness of Rmax 0.5 to 3 μm. R
This is because if the cutting is performed until the surface roughness is less than max 0.5 μm, it takes time and labor and the difficulty of cutting increases. On the other hand, when the surface roughness exceeds Rmax of 3 μm, even if the burnishing process described later is performed, it is difficult to flatten the fine protrusions, and when applied to the photosensitive drum, leakage occurs in the protrusions. A particularly preferable upper limit of the surface roughness to be obtained by cutting is Rmax 2μ.
m.
【００１２】切削後、アルミニウム管の表面にバニシン
グ加工を施す。バニシング加工は、硬質の工具をアルミ
ニウム管の表面に押し付けながら摩擦することにより、
アルミニウム管の表面に塑性変形を生じさせて、平滑な
精度の高い面を得る加工方法である。アルミニウム管の
表面に押し付ける工具として、ローラを用いるのが、円
筒形であるアルミニウム管に対する作業の容易性の点
や、より平滑な面が得られる点で望ましい。かかるバニ
シング加工によって、図１（ａ）に模式的に示すアルミ
ニウム管（１）の表面における断面三角形状の微細凸部
（２）の鋭角的な頂点部分（切削バリ）（2a）が押し潰
されて同図（ｂ）のようになだらかになり、表面全体が
平坦化される。このようなバニシング加工を施さず、Ｒ
max ０．５〜３μｍの表面粗さに切削しただけでは、微
細凸部（２）の鋭角的な頂点部分（2a）でリークを生じ
る。After cutting, the surface of the aluminum tube is burnished. The burnishing process is performed by pressing a hard tool against the surface of the aluminum tube and rubbing it,
This is a processing method in which plastic deformation is caused on the surface of the aluminum tube to obtain a smooth and highly accurate surface. It is preferable to use a roller as a tool to be pressed against the surface of the aluminum tube in terms of easiness of work on the cylindrical aluminum tube and obtaining a smoother surface. The burnishing process crushes the sharp apex (cutting burr) (2a) of the fine protrusion (2) having a triangular cross section on the surface of the aluminum pipe (1) schematically shown in FIG. 1 (a). Then, as shown in FIG. 7B, the surface becomes smooth and the entire surface is flattened. Without such burnishing processing, R
Only by cutting to a surface roughness of max 0.5 to 3 μm, a leak occurs at the sharp apex portion (2a) of the fine convex portion (2).
【００１３】バニシング加工の終了後、表面を洗浄し感
光層を被覆形成して、所期する感光ドラムとなす。感光
層の種類は特に限定されないが、本願発明によれば均一
な薄膜塗工が可能となる点で、電荷発生層の薄膜化が好
ましい積層型のものを用いるのが良い。After the burnishing process is completed, the surface is washed and a photosensitive layer is coated to form a desired photosensitive drum. The type of the photosensitive layer is not particularly limited, but according to the invention of the present application, it is preferable to use a laminated type in which it is preferable to thin the charge generation layer from the viewpoint of enabling uniform thin film coating.
【００１４】[0014]
【作用】Ｒmax ０．５〜３μｍの表面粗さに切削するこ
とによって、表面の平滑性がある程度確保されるととも
に、切削によって生じたアルミニウム管（１）の表面に
おける断面三角形状の微細凸部（２）の鋭角的な頂点部
分（2a）が、バニシング加工によって押し潰されてなだ
らかになり、表面全体がさらに平坦化される。従って、
直接帯電型の感光ドラムに用いられたときに、微細凸部
の鋭角的な頂点部分において生じていたリークが抑制さ
れる。By cutting to a surface roughness of Rmax 0.5 to 3 μm, the smoothness of the surface is secured to some extent, and fine projections (triangular section) on the surface of the aluminum pipe (1) produced by cutting ( The sharp apex portion (2a) of 2) is crushed and smoothed by the burnishing process, and the entire surface is further flattened. Therefore,
When used in a direct charging type photosensitive drum, the leak that occurs at the acute-angled apex of the fine convex portion is suppressed.
【００１５】また、切削はアルミニウム管の表面がＲma
x ０．５〜３μｍの粗さとなるように行うから、加工に
手間を要することなく比較的簡易に行うことができると
共に、バニシング加工による平滑効果が確実に得られ
る。しかも、切削はアルミニウム引抜管に対して行うか
ら、引抜によってＲmax ０．５〜３μｍに近い表面粗さ
が既に得られており、切削作業が簡易となる。The surface of the aluminum pipe is Rma for cutting.
Since it is performed so as to have a roughness of 0.5 to 3 μm, it can be performed relatively easily without the need for labor, and the smoothing effect by the burnishing can be reliably obtained. Moreover, since the cutting is performed on the aluminum drawn tube, the surface roughness close to Rmax 0.5 to 3 μm has already been obtained by the drawing, which simplifies the cutting work.
【００１６】[0016]
【実施例】Ａ３００３−Ｈ１４からなるアルミニウムを
用い、これを押出したのち引抜いて、外径３０ｍｍ×長
さ２６０．５ｍｍの複数本のアルミニウム素管を製作し
た。なお、引抜きは引抜きダイスを変えて行ない、素管
の表面粗さは表１に示すとおりであった。EXAMPLE Aluminum made of A3003-H14 was extruded and then extracted to produce a plurality of aluminum base pipes having an outer diameter of 30 mm and a length of 260.5 mm. The drawing was carried out by changing the drawing die, and the surface roughness of the shell was as shown in Table 1.
【００１７】次に、表１に示す各種の加工法によって表
面加工を行った後、あるいは行うことなく、各アルミニ
ウム管に電荷発生層と電荷輸送層とを有する感光層を以
下のようにして被覆形成した。即ち、電荷発生層は、無
金属フタロシアニンをテトラヒドロフランにて４％に希
釈して、膜厚が約０．３μｍになるように塗工し乾燥し
て形成した。次に、ＣＴ剤（ヒドラゾン化合物）とＣＴ
樹脂（ポリカーボネート）を１：２の比率で塩化メチレ
ンに溶解して、膜厚が２０μｍになるように塗工し乾燥
して電荷輸送層とした。Next, each aluminum tube is coated with a photosensitive layer having a charge generating layer and a charge transporting layer as described below, with or without surface treatment by various processing methods shown in Table 1. Formed. That is, the charge generation layer was formed by diluting metal-free phthalocyanine to 4% with tetrahydrofuran, coating it to a film thickness of about 0.3 μm, and drying it. Next, CT agent (hydrazone compound) and CT
A resin (polycarbonate) was dissolved in methylene chloride in a ratio of 1: 2, coated so as to have a film thickness of 20 μm, and dried to form a charge transport layer.
【００１８】次に、これら感光ドラムを、ローラー帯電
器を用いて直接帯電方式によって−１０００Ｖの電圧で
帯電させ、リークの発生状況を調べた。その結果を表１
に示す。Next, these photosensitive drums were electrified at a voltage of -1000 V by a direct electrification method using a roller electrifier, and the occurrence of leak was examined. The results are shown in Table 1.
Shown in.
【００１９】[0019]
【表１】 表１の結果からわかるように、本発明実施品（Ｎｏ７〜
１０）は、リークの発生が全く認められなかったか極め
て抑制されたものであった。特に、Ｒmax ２μｍ以下に
切削したもの（Ｎｏ７〜９）はリーク防止効果が高いこ
とがわかる。これに対し、引抜管の表面をＲmax １μｍ
に切削しその後のバニシング加工を施さなかったもの
（Ｎｏ１）は、リークが時々発生したが、これは切削バ
リによるものと推測される。また、無切削ＥＤ管を表面
加工することなくそのまま用いたもの（Ｎｏ３）はリー
クが多発したが、これは表面のササクレ状の微細突起に
よるものと推測される。また、無切削ＥＤ管をセンタレ
ス研磨したものやさらに超仕上加工したもの（Ｎｏ４〜
６）もリークが多発したが、これは表面に食い込んでそ
のまま残存した研磨時の砥粒や研磨バリ（研磨による鋭
角的な突起）が原因と推測される。この場合、研磨後に
バニシング加工を実施してもリークは防止できない（Ｎ
ｏ６）。また、引抜管の表面をＲmax ０．３μｍ未満に
切削しその後のバニシング加工を施さなかったもの（Ｎ
ｏ２）は、リークはほとんど発生しなかったが、切削加
工の困難性が増し加工に時間を要するものであった。[Table 1] As can be seen from the results in Table 1, the products of the present invention (No.
In 10), the occurrence of leak was not observed at all or was extremely suppressed. In particular, it can be seen that those cut to Rmax 2 μm or less (Nos. 7 to 9) have a high leak prevention effect. On the other hand, the surface of the drawn tube is Rmax 1 μm
In the case of cutting (No. 1) without cutting and subsequent burnishing, leakage sometimes occurred, but it is presumed that this was due to cutting burr. Further, the uncut ED tube used as it was without being surface-processed (No. 3) caused many leaks, but it is presumed that this was due to the fine protrusions in the shape of the surface. In addition, a non-cutting ED pipe that is centerless-polished or a product that is further superfinished (No. 4 to
6) leaks frequently occurred, but it is presumed that this is due to the abrasive grains and polishing burrs (a sharp projection due to polishing) that dig into the surface and remain as they are during polishing. In this case, leakage cannot be prevented even if burnishing is performed after polishing (N
o6). In addition, the surface of the drawn tube was cut to have a Rmax of less than 0.3 μm and the subsequent burnishing was not performed (N
In the case of o2), almost no leakage occurred, but the difficulty of cutting was increased and the processing required time.
【００２０】[0020]
【発明の効果】この発明は、上述の次第で、アルミニウ
ム引抜管の表面を、Ｒmax ０．５〜３μｍに切削したの
ち、表面にバニシング加工を施すことを特徴とするもの
であるから、Ｒmax ０．５〜３μｍの表面粗さに切削す
ることによって、表面の平滑性をある程度確保できると
ともに、切削によって生じたアルミニウム管の表面にお
ける断面三角形状の微細凸部の鋭角的な頂点部分が、バ
ニシング加工によって押し潰されてなだらかになり、表
面全体をさらに平坦化できる。従って、直接帯電型の感
光ドラムに用いられたときに、微細凸部の鋭角的な頂点
部分を起点として生じていたリークを抑制することがで
き、高品質の感光ドラムを提供できる。As described above, the present invention is characterized in that the surface of an aluminum drawn tube is cut to have a Rmax of 0.5 to 3 μm and then burnished on the surface. By cutting to a surface roughness of 5 to 3 μm, the smoothness of the surface can be secured to some extent, and the sharp apex portion of the fine protrusion having a triangular cross-section on the surface of the aluminum pipe produced by the cutting is burnished. Is crushed by and becomes smooth, and the entire surface can be further flattened. Therefore, when it is used for a direct charging type photosensitive drum, it is possible to suppress the leak that has occurred from the acute-angled apex portion of the fine convex portion as a starting point, and it is possible to provide a high-quality photosensitive drum.
【００２１】また、切削はアルミニウム管の表面がＲma
x ０．５〜３μｍの粗さとなるように行うから、加工に
手間を要することなく比較的簡易に行うことができると
共に、バニシング加工による平滑効果を確実に得ること
ができる。しかも、切削はアルミニウム引抜管に対して
行うから、引抜によってＲmax ０．５〜３μｍに近い表
面粗さが既に得られており、切削作業が簡易となる効果
もある。The surface of the aluminum pipe is Rma for cutting.
Since it is performed so as to have a roughness of 0.5 to 3 μm, the processing can be performed relatively easily without requiring labor, and the smoothing effect by the burnishing processing can be surely obtained. Moreover, since the cutting is performed on the aluminum drawn pipe, the surface roughness close to Rmax 0.5 to 3 μm has already been obtained by the drawing, and there is an effect that the cutting work is simplified.
【図１】（ａ）はアルミニウム引抜管の表面切削後の模
式的断面拡大図、（ｂ）は同じくバニシング加工後の模
式的断面拡大図である。FIG. 1 (a) is a schematic enlarged cross-sectional view of an aluminum drawn tube after surface cutting, and FIG. 1 (b) is a schematic enlarged cross-sectional view after burnishing.
１…アルミニウム管 ２…微細凸部 1 ... Aluminum tube 2 ... Fine protrusion
Claims (1)
（最大高さ）０．５〜３μｍの表面粗さに切削したの
ち、表面にバニシング加工を施すことを特徴とする感光
ドラム用アルミニウム管の製造方法。1. The surface of an aluminum drawn tube is Rmax
(Maximum height) A method for manufacturing an aluminum tube for a photosensitive drum, which comprises cutting to a surface roughness of 0.5 to 3 μm and then subjecting the surface to burnishing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23352094A JP2831577B2 (en) | 1994-09-28 | 1994-09-28 | Method of manufacturing aluminum tube for photosensitive drum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23352094A JP2831577B2 (en) | 1994-09-28 | 1994-09-28 | Method of manufacturing aluminum tube for photosensitive drum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0895273A true JPH0895273A (en) | 1996-04-12 |
| JP2831577B2 JP2831577B2 (en) | 1998-12-02 |
Family
ID=16956326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23352094A Expired - Fee Related JP2831577B2 (en) | 1994-09-28 | 1994-09-28 | Method of manufacturing aluminum tube for photosensitive drum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2831577B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000122310A (en) * | 1998-10-14 | 2000-04-28 | Nisshin Unyu Kogyo Kk | Production of mirror surface pipe for photorecertive drum of copying machine or the like |
| CN106527069A (en) * | 2016-12-23 | 2017-03-22 | 苏州恒久光电科技股份有限公司 | Organic photoconductor |
| JP2018017929A (en) * | 2016-07-28 | 2018-02-01 | 富士ゼロックス株式会社 | Conductive support body for electrophotographic photoreceptor, electrophotographic photoreceptor, process cartridge and image forming apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH081510A (en) * | 1994-06-27 | 1996-01-09 | Kobe Steel Ltd | Manufacture of aluminum pipe and electrophotographic photosensitive drum manufactured by this manufacturing method |
-
1994
- 1994-09-28 JP JP23352094A patent/JP2831577B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH081510A (en) * | 1994-06-27 | 1996-01-09 | Kobe Steel Ltd | Manufacture of aluminum pipe and electrophotographic photosensitive drum manufactured by this manufacturing method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000122310A (en) * | 1998-10-14 | 2000-04-28 | Nisshin Unyu Kogyo Kk | Production of mirror surface pipe for photorecertive drum of copying machine or the like |
| JP2018017929A (en) * | 2016-07-28 | 2018-02-01 | 富士ゼロックス株式会社 | Conductive support body for electrophotographic photoreceptor, electrophotographic photoreceptor, process cartridge and image forming apparatus |
| CN106527069A (en) * | 2016-12-23 | 2017-03-22 | 苏州恒久光电科技股份有限公司 | Organic photoconductor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2831577B2 (en) | 1998-12-02 |
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