JP3885451B2 - Electrophotographic photoreceptor - Google Patents

Electrophotographic photoreceptor Download PDF

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Publication number
JP3885451B2
JP3885451B2 JP2000053140A JP2000053140A JP3885451B2 JP 3885451 B2 JP3885451 B2 JP 3885451B2 JP 2000053140 A JP2000053140 A JP 2000053140A JP 2000053140 A JP2000053140 A JP 2000053140A JP 3885451 B2 JP3885451 B2 JP 3885451B2
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Japan
Prior art keywords
groove
photosensitive member
central axis
electrophotographic photosensitive
ground plate
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JP2000053140A
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JP2001242746A (en
Inventor
慎一 飯嶋
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Mitsubishi Chemical Corp
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Mitsubishi Chemical Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、電子写真感光体に関する。より詳しくは、特殊形状のアース板や中心軸を用いた電子写真感光体の機械的構造に関する。
【０００２】
【従来の技術】
複写機、プリンター、ファクシミリ等の電子写真式機器には、電子写真感光体が使用されている。そして、この電子写真感光体としては、外周面に感光塗膜が形成された円筒状ドラムの両端にフランジを装着して成るドラム式の電子写真感光体が一般に知られている。
【０００３】
電子写真感光体は、感光体と導通をとるためアース板を設けることが知られており、例えば、特開平１１−２５８９５１号公報には、アース板と中心軸との接点に溝を設けて接点面積を増やすという技術が開示されている。
【０００４】
【発明が解決しようとする課題】
しかし、アース板の強度が充分でないために、電子写真感光体から中心軸を出し入れするときに、アース板（図３の６）が、中心軸の溝（図５）にかかったまま中心軸が出し入れされる場合があり、アース板に無理な力がかかるためアース板が変形してしまうという問題点があった。
【０００５】
【課題を解決するための手段】
本発明は、上記課題を解決すべく鋭意検討された結果なされたもので、特殊形状のアース板を用いた電子写真感光体用フランジや特殊形状の中心軸を用いた電子写真感光体によれば上記課題が解決できることを見出したものである。
すなわち、本発明の要旨は、円筒状ドラムの端部に設けられ、かつ円筒状ドラムを貫通する中心軸を介して支持される電子写真感光体用フランジであって、前記フランジは溝を有する中心軸に接触するアース板を有し、かつ当該溝の底部と中心軸表面を結ぶ溝部の側面と、溝の底部とのなす角が、９５度以上１６０度以下であって、当該アース板は、中心軸との接触部において屈曲部を有しており、当該屈曲部がＲ０．２ミリ以上であり、かつ屈曲部の屈曲角が９０度から１５０度の角度であることを特徴とする電子写真感光体用フランジを円筒状ドラムの少なくとも一端に用いることを特徴とする電子写真感光体に存する。アース板がこのような形状をとれば、充分な強度、弾性を得ることが可能となる。また、中心軸に溝を有する電子写真感光体の場合には、中心軸を出し入れする際に、アース板が当該溝に引っかかることを有効に防止できるため特に好ましい。
【０００６】
上記フランジは、電子写真感光体に有効に用いることが可能となる。本発明は、中心軸の溝が溝幅が１ｍｍ以上３ｍｍ以下であり、溝の深さが０．５ｍｍ以上１．５ｍｍ以下である電子写真感光体の場合に特に好適に用いられる。中心軸の溝がこの様な形状であれば、上記アース板と中心軸との接点を確保することが可能となり好適にアースをとることが可能となるのである。また、本発明は、中心軸の底部と中心軸表面を結ぶ溝部の側面と当該溝の底部とのなす角が、９５度以上１６０度以下である電子写真感光体に好適に用いられる。このように、溝部の側面と当該溝の底部とのなす角が鈍角であれば、電子写真感光体から中心軸を出し入れする際にも比較的スムーズにアース板が溝を通過するのである。本発明は、中心軸の中心軸表面と溝の側面の交わる付近が、Ｃ面処理または、Ｒ処理されている電子写真感光体に好適に用いられる。中心軸にこのような処理を施すことで、電子写真感光体から中心軸を出し入れする際に、スムーズにアース板が溝を通過するのである。
【０００７】
【発明の実施の形態】
以下、図面を参照して本発明に係る電子写真感光体の各実施形態を説明する。図１は第１実施形態の全体構造を示す断面図、図２は第１実施形態の要部であるアース板先端部を表す図、図３は従来のアース板先端部を表す図、図４は本発明の実施形態の要部である中心軸の溝部の一形態を表す図、図５は本発明の別の実施形態の要部である中心軸の溝部の一形態を表す図、図６は従来例における中心軸の溝部を表す図である。
【０００８】
本発明の電子写真感光体は、図１に示す様に、円筒状ドラム１の両端に装着された合成樹脂製の各フランジ２、３が中心軸４を介して支持される。中心軸の溝部には、金属製のｅ−リングが圧入される。両フランジ２、３は、中心軸の溝部に圧入されたｅ−リング５により固定されている。また、アース板６が中心軸４と接触することによりアースがとられている。
【０００９】
円筒状ドラム１は、高精度の真円度および円筒度に仕上げられた円筒状基体の表面に感光塗膜が形成されて成り、使用される電子写真式ＯＡ機器に応じ、外径が１５〜１３０ｍｍ程度に、長さが２００〜１１００ｍｍ程度に設定される。本実施形態において、ドラム１の外径は、用途に応じ２０ｍｍから、１００ｍｍ程度に設定されている。
【００１０】
円筒状ドラムの材料としては、アルミニウム、黄銅、ステンレス等の金属材料、または、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリプロピレン、ナイロン、ポリスチレン、フエノール樹脂などの高分子材料が挙げられる。また、感光塗膜は、例えば、電荷発生物質、電荷輸送物質、結着剤樹脂および溶剤を混合して調製された公知の塗布液中に円筒状基体を浸漬することによって形成される。
【００１１】
前記電荷発生物質としては、アゾ顔料、ジスアゾ顔料などが挙げられ、電荷輸送物質としては、アントラセン等の多芳香族化合物またはヒドラゾン化合物などが挙げられる。また、結着剤樹脂としては、ポリメタクリル酸エステル類、セルロースエステル類などが挙げられ、溶剤としては、ｎ−ブチルアミン、ジエチルアミン、メチルセルソルブアセテート等が挙げられる。
【００１２】
フランジ２、３は、各部の肉厚が略均一であり、大径筒部２ｂ、３ｂと小径筒部２ａ、３ａ、とが高い同芯度を以て射出成形されている。斯かるフランジ２、３は、大径筒部の外周が円筒状ドラム１の内周に嵌合され、小径筒部２ａ、３ａの内周に中心軸４が嵌合される。
【００１３】
フランジ２、３の成形樹脂としては、入手が容易で安価な汎用エンジニアリング樹脂を使用することが出来る。この場合、使用する樹脂には導電性が付与されているのが好ましい。また、使用する樹脂の線膨張係数は、ドラム１の円筒状基体の線膨張係数に近いこと、すなわち、円筒状基体がアルミニウム製である場合には、線膨張係数がアルミニウムの線膨張係数に近い樹脂を使用するのが好ましい。
【００１４】
中心軸４は、例えば、直径が５〜２０ｍｍ程度、程度に研削仕上されたステンレス鋼から成り、図示省略されたように電子写真感光体を貫通した一本の軸であってもよいし、電子写真式ＯＡ機器側に固定されて同軸上に左右一対配置されてもよい。斯かる中心軸４が小径筒部５Ｂの内周に緊密に嵌合されることにより、ドラム１は電子写真式ＯＡ機器に対しベース部材５を介して回転自在に支持される。中心軸の溝は、アース板と中心軸との接点を確保するため、アース板や電子写真感光体の大きさ等にもよるが、一般には、溝幅が１ｍｍ以上３ｍｍ以下であることが好ましく、より好ましくは、１〜２ｍｍである。また、溝の深さとしては、０．５ｍｍ以上１．５ｍｍ以下が好ましく、０．５ｍｍ以上１ｍｍ以下がより好ましい。中心軸の溝がこの様な形状であれば、上記のことが可能となり好適にアースをとることが可能となる。図４に示すように、中心軸の底部と中心軸表面を結ぶ溝部の側面７ａと当該溝の底部７ｂとのなす角が、鈍角であれば、電子写真感光体から中心軸を出し入れする際にも比較的スムーズにアース板が溝を通過するので好ましい。溝部の側面と当該溝の底部とのなす角は、９５度以上１６０度以下が好ましく、より好ましくは、１００度以上１４５度以下である。図５に示すように、中心軸の中心軸表面と溝の側面の交わる付近は、ある程度丸みを帯びている方が、電子写真感光体から中心軸を出し入れする際に、スムーズにアース板が溝を通過できるため、中心軸の中心軸表面と溝の側面の交わる付近は、Ｃ面処理または、Ｒ処理されていることが望ましい。ここで、Ｃ面処理とは、任意の角部を斜めに削り落とし、テーパーを設ける処理のことを意味し、Ｒ処理とは任意の角部を円弧状に加工する処理のことを意味する。
【００１５】
本発明においてはドラムの両端のフランジのうち少なくとも一方には中心軸に接触するアース板を有する。このアース板によりドラムのアースをとるのである。
アース板の材質としては、ある程度の導電性を有するのもであれば特に限定されるものではないが、例えば、鉄、アルミニウム、銅などがあげられる。これらのうち鉄が柔軟性、剛性等の観点から好ましい。
アース板は、中心軸との接触部において屈曲している。アース板の中心軸との接触部の先端形状としては、図２のようにある程度丸みを帯びている方が、強度・弾性を有し、電子写真感光体から中心軸を出し入れする際にも比較的スムーズにアース板が溝を通過するため望ましく、好ましくは、Ｒ０．２ｍｍ以上であり、より好ましくは、Ｒ０．３ｍｍ以上である。一方、アース板の中心軸との接触部の好ましい丸みは、中心軸の溝の深さや、アース板の形状によっても変化するが、Ｒ５以下が好ましい。
また、図２にように、アース板の中心軸との接触部は、ある程度の角度をもっていた方がアース板の強度を確保でき、しかもスムーズに溝を通過することができるので好ましい。アース板の中心軸との接触部は好ましくは９０度から１５０度、より好ましくは１３０度から１５０度の角度を有することが望ましい。
【００１６】
次に、以上の様に構成された実施形態の電子写真感光体の使用例を説明する。この電子写真感光体は、図１に示す様に中心軸４にフランジ２、３が回転自在に支持され、当該フランジに嵌合されるギヤ部材の外歯（図示せず）が電子写真式ＯＡ機器側の駆動ギヤに噛合うことにより、所定の回転速度で回転駆動される。
【００１７】
【発明の効果】
本発明によれば、アース板を変形することなく電子写真感光体から中心軸を出し入れすることができるという効果がある。
【図面の簡単な説明】
【図１】図１は第１実施形態の全体構造を示す断面図である。
【図２】図２は第１実施形態の要部であるアース板先端部の拡大図である。
【図３】図３は従来のアース板先端部である。
【図４】図４は本発明の実施形態の要部である中心軸の溝部の一形態を表す図である。
【図５】図５は本発明の別の実施形態の要部である中心軸の溝部の一形態を表す図である。
【図６】図６は従来例における中心軸の溝部を表す図である。
【符号の説明】
１ 円筒状ドラム
２ フランジ
２ａ 小径筒部
２ｂ 大径筒部
３ フランジ
３ａ 小径筒部
３ｂ 大径筒部
４ 中心軸
５ ｅ−リング
６ アース板
７ 中心軸の溝部
７ａ 溝部側面
７ｂ 溝部底面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrophotographic photoreceptor. More specifically, the present invention relates to a mechanical structure of an electrophotographic photosensitive member using a specially shaped ground plate and a central axis.
[0002]
[Prior art]
An electrophotographic photosensitive member is used in electrophotographic apparatuses such as copying machines, printers, and facsimiles. As this electrophotographic photosensitive member, a drum type electrophotographic photosensitive member in which flanges are attached to both ends of a cylindrical drum having a photosensitive coating film formed on the outer peripheral surface is generally known.
[0003]
It is known that an electrophotographic photosensitive member is provided with a ground plate for electrical connection with the photosensitive member. For example, in Japanese Patent Application Laid-Open No. 11-258951, a contact point is provided by providing a groove at a contact point between a ground plate and a central axis. A technique for increasing the area is disclosed.
[0004]
[Problems to be solved by the invention]
However, since the strength of the ground plate is not sufficient, when the central shaft is taken in and out of the electrophotographic photosensitive member, the ground plate (6 in FIG. 3) remains in the center shaft groove (FIG. 5) and the central shaft is In some cases, the ground plate is deformed due to excessive force applied to the ground plate.
[0005]
[Means for Solving the Problems]
The present invention was made as a result of intensive studies to solve the above-described problems, and according to an electrophotographic photoreceptor using a flange for an electrophotographic photoreceptor using a special-shaped ground plate and a central shaft having a special shape. It has been found that the above problems can be solved.
Ie, Abstract of the present invention is provided at an end of the cylindrical drum, and an electrophotographic photoreceptor flange which is supported via a central shaft passing through the cylindrical drum, said flange groove And an angle formed by a side surface of the groove portion connecting the bottom portion of the groove and the surface of the central shaft and the bottom portion of the groove is 95 degrees or more and 160 degrees or less, The plate has a bent portion at a contact portion with the central axis, the bent portion is R 0.2 mm or more, and a bent angle of the bent portion is an angle of 90 degrees to 150 degrees. The electrophotographic photosensitive member is characterized in that a flange for an electrophotographic photosensitive member is used at least at one end of a cylindrical drum . If the ground plate has such a shape, sufficient strength and elasticity can be obtained. In addition, an electrophotographic photosensitive member having a groove on the central axis is particularly preferable because the ground plate can be effectively prevented from being caught in the groove when the central axis is inserted and removed.
[0006]
Upper Symbol flange, it is possible to effectively use the electrophotographic photosensitive member. The present invention is particularly preferably used in the case of an electrophotographic photoreceptor in which the groove of the central axis has a groove width of 1 mm or more and 3 mm or less and a groove depth of 0.5 mm or more and 1.5 mm or less. If the groove of the central shaft has such a shape, it is possible to secure a contact point between the ground plate and the central shaft, and it is possible to suitably ground. In addition, the present invention is suitably used for an electrophotographic photosensitive member in which an angle formed by a side surface of a groove portion connecting the bottom portion of the central axis and the surface of the central shaft and a bottom portion of the groove is 95 degrees or more and 160 degrees or less. Thus, if the angle formed by the side surface of the groove and the bottom of the groove is an obtuse angle, the earth plate passes through the groove relatively smoothly even when the central axis is taken in and out of the electrophotographic photosensitive member. The present invention is preferably used for an electrophotographic photosensitive member in which the vicinity of the central axis surface of the central axis and the side surface of the groove intersects with a C surface or an R. By performing such processing on the central axis, the earth plate smoothly passes through the groove when the central axis is taken in and out of the electrophotographic photosensitive member.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the electrophotographic photosensitive member according to the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the overall structure of the first embodiment, FIG. 2 is a view showing a front end portion of a ground plate, which is a main part of the first embodiment, and FIG. 3 is a view showing a front end portion of a conventional ground plate. FIG. 5 is a diagram showing an embodiment of the groove portion of the central shaft that is the main part of the embodiment of the present invention, FIG. 5 is a diagram showing an embodiment of the groove portion of the central shaft that is the main portion of another embodiment of the present invention, These are figures showing the groove part of the central axis in a prior art example.
[0008]
In the electrophotographic photosensitive member of the present invention, as shown in FIG. 1, synthetic resin flanges 2 and 3 attached to both ends of a cylindrical drum 1 are supported via a central shaft 4. A metal e-ring is press-fitted into the groove portion of the central shaft. Both flanges 2 and 3 are fixed by an e-ring 5 press-fitted into the groove portion of the central shaft. The ground plate 6 is grounded by contacting the central shaft 4.
[0009]
The cylindrical drum 1 is formed by forming a photosensitive coating on the surface of a cylindrical substrate finished with high precision roundness and cylindricity, and has an outer diameter of 15 to depending on the electrophotographic OA equipment used. The length is set to about 200 to 1100 mm to about 130 mm. In the present embodiment, the outer diameter of the drum 1 is set to about 20 mm to about 100 mm depending on the application.
[0010]
Examples of the material of the cylindrical drum include metal materials such as aluminum, brass, and stainless steel, or polymer materials such as polyethylene terephthalate, polybutylene terephthalate, polypropylene, nylon, polystyrene, and phenol resin. The photosensitive coating film is formed, for example, by immersing a cylindrical substrate in a known coating solution prepared by mixing a charge generating substance, a charge transporting substance, a binder resin and a solvent.
[0011]
Examples of the charge generation material include azo pigments and disazo pigments, and examples of the charge transport material include polyaromatic compounds such as anthracene or hydrazone compounds. In addition, examples of the binder resin include polymethacrylic acid esters and cellulose esters, and examples of the solvent include n-butylamine, diethylamine, and methyl cellosolve acetate.
[0012]
In the flanges 2 and 3, the thickness of each part is substantially uniform, and the large diameter cylindrical parts 2b and 3b and the small diameter cylindrical parts 2a and 3a are injection-molded with high concentricity. In such flanges 2 and 3, the outer periphery of the large diameter cylindrical portion is fitted to the inner periphery of the cylindrical drum 1, and the central shaft 4 is fitted to the inner periphery of the small diameter cylindrical portions 2 a and 3 a.
[0013]
As the molding resin for the flanges 2 and 3, a general-purpose engineering resin that is easily available and inexpensive can be used. In this case, it is preferable that the resin used has conductivity. Further, the linear expansion coefficient of the resin used is close to the linear expansion coefficient of the cylindrical base body of the drum 1, that is, when the cylindrical base body is made of aluminum, the linear expansion coefficient is close to the linear expansion coefficient of aluminum. It is preferable to use a resin.
[0014]
The central axis 4 is made of, for example, stainless steel that has a diameter of about 5 to 20 mm and is ground, and may be a single axis that penetrates the electrophotographic photosensitive member as shown in the drawing. A pair of right and left may be arranged on the same axis fixed on the photographic OA device side. When the central shaft 4 is closely fitted to the inner periphery of the small diameter cylindrical portion 5B, the drum 1 is rotatably supported by the electrophotographic OA device via the base member 5. Groove of the central axis, to ensure the contact between the grounding plate and the central axis, depending on the size of the grounding plate and the electrophotographic photosensitive member, in general, the groove width is 1mm 3mm or more or less Is more preferable, and more preferably 1 to 2 mm. Moreover, as a depth of a groove | channel, 0.5 mm or more and 1.5 mm or less are preferable, and 0.5 mm or more and 1 mm or less are more preferable. If the grooves of the central axis is in such a shape, it is possible to take a suitably ground becomes possible above. As shown in FIG. 4, when the angle formed by the side surface 7a of the groove portion connecting the bottom portion of the central axis and the surface of the central shaft and the bottom portion 7b of the groove is an obtuse angle, the central shaft is taken in and out of the electrophotographic photosensitive member. However, it is preferable because the ground plate passes through the groove relatively smoothly. The angle formed by the side surface of the groove and the bottom of the groove is preferably 95 degrees or more and 160 degrees or less, and more preferably 100 degrees or more and 145 degrees or less. As shown in FIG. 5, when the central axis surface of the central axis and the side surface of the groove intersect each other, the ground plate is more smoothly rounded when the central axis is taken in and out of the electrophotographic photosensitive member if it is somewhat rounded. Therefore, it is desirable that the vicinity of the center axis surface of the center axis and the side surface of the groove be C-plane processed or R-processed. Here, the C-plane process means a process of cutting off an arbitrary corner part obliquely and providing a taper, and the R process means a process of processing an arbitrary corner part into an arc shape.
[0015]
In the present invention, at least one of the flanges at both ends of the drum has a ground plate in contact with the central axis. The ground plate is used to ground the drum.
The material of the ground plate is not particularly limited as long as it has a certain degree of conductivity, and examples thereof include iron, aluminum, and copper. Among these, iron is preferable from the viewpoints of flexibility and rigidity.
The ground plate is bent at the contact portion with the central axis. The tip shape of the contact point with the center axis of the ground plate is stronger and more elastic when rounded to some extent as shown in Fig. 2, and it is also compared when the center axis is taken in and out of the electrophotographic photosensitive member. It is desirable for the ground plate to pass through the groove smoothly and smoothly, preferably R0.2 mm or more, and more preferably R0.3 mm or more. On the other hand, the preferred roundness of the contact portion with the center axis of the ground plate varies depending on the depth of the groove of the center shaft and the shape of the ground plate, but is preferably R5 or less.
In addition, as shown in FIG. 2, it is preferable that the contact portion with the central axis of the ground plate has a certain angle because the strength of the ground plate can be secured and the groove can be smoothly passed. The contact portion with the central axis of the ground plate preferably has an angle of 90 to 150 degrees, more preferably 130 to 150 degrees.
[0016]
Next, a usage example of the electrophotographic photosensitive member of the embodiment configured as described above will be described. In this electrophotographic photosensitive member, as shown in FIG. 1, flanges 2 and 3 are rotatably supported by a central shaft 4, and external teeth (not shown) of gear members fitted to the flange are electrophotographic OA. By being engaged with the drive gear on the device side, it is rotationally driven at a predetermined rotational speed.
[0017]
【The invention's effect】
According to the present invention, there is an effect that the central axis can be taken in and out of the electrophotographic photosensitive member without deforming the ground plate.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the overall structure of a first embodiment.
FIG. 2 is an enlarged view of a front end portion of a ground plate, which is a main part of the first embodiment.
FIG. 3 shows a conventional earth plate tip.
FIG. 4 is a view showing one form of a groove portion of a central shaft, which is a main part of the embodiment of the present invention.
FIG. 5 is a diagram showing an embodiment of a groove portion of a central shaft that is a main part of another embodiment of the present invention.
FIG. 6 is a view showing a groove portion of a central axis in a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylindrical drum 2 Flange 2a Small-diameter cylinder part 2b Large-diameter cylinder part 3 Flange 3a Small-diameter cylinder part 3b Large-diameter cylinder part 4 Center shaft 5 E-ring 6 Ground plate 7 Center-axis groove part 7a Groove side surface 7b Groove part bottom face

Claims (3)

円筒状ドラムの端部に設けられ、かつ円筒状ドラムを貫通する中心軸を介して支持される電子写真感光体用フランジであって、
前記フランジは溝を有する中心軸に接触するアース板を有し、 かつ当該溝の底部と中心軸表面を結ぶ溝部の側面と、溝の底部とのなす角が、９５度以上１６０度以下であって、当該アース板は、中心軸との接触部において屈曲部を有しており、当該屈曲部がＲ０．２ミリ以上であり、かつ屈曲部の屈曲角が９０度から１５０度の角度であることを特徴とする電子写真感光体用フランジを円筒状ドラムの少なくとも一端に用いることを特徴とする電子写真感光体。 A flange for an electrophotographic photosensitive member provided at an end of a cylindrical drum and supported via a central axis that penetrates the cylindrical drum,
The flange has a ground plate in contact with the central axis having a groove, and an angle formed by a side surface of the groove portion connecting the bottom portion of the groove and the surface of the central shaft and the bottom portion of the groove is not less than 95 degrees and not more than 160 degrees. The ground plate has a bent portion at the contact portion with the central axis, the bent portion is R 0.2 mm or more, and the bent angle of the bent portion is an angle of 90 to 150 degrees. An electrophotographic photosensitive member characterized by using a flange for an electrophotographic photosensitive member at least at one end of a cylindrical drum. 中心軸の溝の溝幅が１ｍｍ以上３ｍｍ以下であり、かつ溝の深さが０．５ｍｍ以上１．５ｍｍ以下であることを特徴とする請求項１に記載の電子写真感光体。2. The electrophotographic photosensitive member according to claim 1 , wherein the groove width of the central axis groove is 1 mm or more and 3 mm or less, and the groove depth is 0.5 mm or more and 1.5 mm or less. 中心軸の中心軸表面と溝の側面の交わる付近が、Ｃ面処理または、Ｒ処理されていることを特徴とする請求項１または２に記載の電子写真感光体。Nearby intersection of the side surface of the central shaft surface and the groove of the central axis, C face treatment or electrophotographic photosensitive member according to claim 1 or 2, characterized in that it is R processed.
JP2000053140A 2000-02-29 2000-02-29 Electrophotographic photoreceptor Expired - Fee Related JP3885451B2 (en)

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