JP2005215311A - Electrophotographic photoreceptor - Google Patents

Electrophotographic photoreceptor Download PDF

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JP2005215311A
JP2005215311A JP2004021727A JP2004021727A JP2005215311A JP 2005215311 A JP2005215311 A JP 2005215311A JP 2004021727 A JP2004021727 A JP 2004021727A JP 2004021727 A JP2004021727 A JP 2004021727A JP 2005215311 A JP2005215311 A JP 2005215311A
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conductive
photosensitive member
flange
electrophotographic photosensitive
base body
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Shuichi Hamada
修一 浜田
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Fuji Electric Imaging Device Co Ltd
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Fuji Electric Imaging Device Co Ltd
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  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Photoreceptors In Electrophotography (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor wherein components for the electrophotographic photoreceptor are made common and which is provided with a grounding mechanism nearly free from the generation of image obstacles and the like in accordance with sliding abnormal noise generated from a contact point of a metal grounding plate and a supporting pin, conduction defects due to excess wear of the metal grounding plate, engagement defects of a flange due to the deformation of the metal grounding plate, and deformation defects of an outer surface of a base body. <P>SOLUTION: The electrophotographic photoreceptor provided with at least a cylindrical conductive base body and a resin flange engaged with the interior of an aperture end of the base body and supported by a conductive center shaft includes a conductive member coming into contact with the inner peripheral surface of the base body and the center shaft and separately independent of the resin flange in the base body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、円筒状導電性基体の外周面に有機材料を主成分とする感光層が形成された感光ドラムと、その開口端部に樹脂フランジを備える電子写真感光体に関し、特にはその接地機構に関する。   The present invention relates to a photosensitive drum in which a photosensitive layer mainly composed of an organic material is formed on the outer peripheral surface of a cylindrical conductive substrate, and an electrophotographic photosensitive member provided with a resin flange at an opening end thereof, in particular, a grounding mechanism thereof. About.

電子写真感光体は、円筒状の導電性基体上に光導電性を有する感光層を備えた感光ドラムと、このドラムの両端開口部にそれぞれギヤ無しフランジ、平歯または斜歯ギヤ付きフランジ等のいずれかを強固に結合させたものからなる。
この電子写真感光体は、複写機、プリンタ、ファクシミリなどの電子写真装置、またはこれらの装置に搭載されるプロセスカートリッジに装着される。画像形成を行う際には、装置側の回転駆動力が前記フランジと一体成形されたギヤ(歯車)を介して感光ドラムに安定して繰り返し伝達される必要がある。したがって、樹脂フランジの脱落や結合のゆるみ等がないように、感光ドラムの両端へのフランジの結合には極めて高い信頼性が求められる。
一方、電子写真装置における画像形成は、電子写真感光体を支持ピンの周りに回転させながら、その外周面近傍上に設置される電子写真プロセス部材の機能、すなわち、感光体表面の帯電、露光、現像、転写、(定着)、クリーニング、除電等を1サイクルとする電子写真プロセス機能を順に奏することにより実行される。さらにこれらの電子写真プロセス機能が支障無く実行されるには、アルミニウム合金などからなる感光ドラムの基体を接地することが重要である。そのためには装置側でアース電位に接続された支持ピンと前記基体間の電気的導通を確実にとる必要がある。この支持ピンと基体間の導通が充分でなく電気抵抗が大きくなると、画像濃度が下がるなどの画像障害が発生することがある。
An electrophotographic photosensitive member includes a photosensitive drum provided with a photosensitive layer having photoconductivity on a cylindrical conductive substrate, and a flange without gears, a flange with flat teeth or an inclined gear, etc. at both ends of the drum. It consists of one that is firmly bonded.
The electrophotographic photosensitive member is mounted on an electrophotographic apparatus such as a copying machine, a printer, or a facsimile, or a process cartridge mounted on these apparatuses. When performing image formation, it is necessary that the rotational driving force on the apparatus side be stably and repeatedly transmitted to the photosensitive drum through a gear (gear) integrally formed with the flange. Therefore, extremely high reliability is required for coupling the flange to both ends of the photosensitive drum so that the resin flange does not fall off or loosen.
On the other hand, the image formation in the electrophotographic apparatus is a function of an electrophotographic process member installed on the vicinity of the outer peripheral surface of the electrophotographic photosensitive member while rotating the electrophotographic photosensitive member around the support pin, that is, charging, exposure, It is executed by sequentially performing an electrophotographic process function in which development, transfer, (fixing), cleaning, static elimination, etc. are one cycle. Further, in order to execute these electrophotographic process functions without any trouble, it is important to ground the substrate of the photosensitive drum made of an aluminum alloy or the like. For this purpose, it is necessary to ensure electrical continuity between the support pin connected to the ground potential on the apparatus side and the substrate. If the conduction between the support pin and the substrate is not sufficient and the electrical resistance increases, an image failure such as a decrease in image density may occur.

図3は従来の電子写真感光体についてフランジの嵌合前の状態を示す一部破断正面図である。導電性基体上に感光層が形成された感光ドラム1と、このドラム1に嵌合される従来の金属アース板2を備えた樹脂フランジ3による接地機構と、感光ドラム1を樹脂フランジ3の中心軸孔4により支持するために電子写真装置側に接地されて固定されている支持ピン5とをそれぞれ分離させた状態の電子写真感光体10を示す。金属アース板2としてはSUS304のステンレスやリン青銅などの弾性金属材料が用いられ、支持ピン5としてはステンレススチール材が主に採用される。
また、金属アース板を用いない接地機構としては、樹脂フランジを導電性にする方法、導電性ブラシを用いる方法(特許文献1〜5参照)が知られている。しかし、いずれもアース板と導電性ブラシを組み合わせて用いるものであり、組み立てに時間を要したり、コストが高くなりすぎる傾向がある。
FIG. 3 is a partially broken front view showing a state of the conventional electrophotographic photoreceptor before the flange is fitted. A photosensitive drum 1 having a photosensitive layer formed on a conductive substrate, a grounding mechanism by a resin flange 3 having a conventional metal ground plate 2 fitted to the drum 1, and the photosensitive drum 1 at the center of the resin flange 3 The electrophotographic photosensitive member 10 is shown in a state where the support pins 5 that are grounded and fixed to the electrophotographic apparatus side to be supported by the shaft hole 4 are separated from each other. The metal ground plate 2 is made of an elastic metal material such as SUS304 stainless steel or phosphor bronze, and the support pin 5 is mainly made of stainless steel.
As a grounding mechanism that does not use a metal ground plate, a method of making a resin flange conductive and a method of using a conductive brush (see Patent Documents 1 to 5) are known. However, both are used in combination with a ground plate and a conductive brush, and there is a tendency that time is required for assembly and the cost becomes too high.

前記感光ドラム1への前記樹脂フランジ3の嵌合には圧入治具を使用し、樹脂フランジ3を感光ドラム1の開口端部に形成されたインロー部6に嵌合させ、アース板2の外周接触部8をドラム1の基体内面に接触させて電子写真感光体10とする。この電子写真感光体10を図示しない複写機やプリンターなどの電子写真装置に搭載する際に、装置側の支持ピン5や支持軸をアース板2の中心接触部7に接触させることにより、感光ドラム1上に帯電している不要の表面電荷を接地して除去していた。ここで、支持軸とは感光ドラムを貫通するタイプの軸体であり、支持ピンは感光ドラムの両端の樹脂フランジの中心軸孔を支持するために必要な長さの突起状ピンである。これらをあわせて以下「中心軸」ともいう。
特開平9−114168号公報 特開2001−75423号公報 特開2001−305769号公報 特開2002−62759号公報 特開2002−116660号公報
A press-fitting jig is used to fit the resin flange 3 to the photosensitive drum 1, and the resin flange 3 is fitted to the inlay portion 6 formed at the opening end of the photosensitive drum 1, so that the outer periphery of the ground plate 2 is The contact portion 8 is brought into contact with the inner surface of the substrate of the drum 1 to form the electrophotographic photosensitive member 10. When the electrophotographic photosensitive member 10 is mounted on an electrophotographic apparatus such as a copying machine or a printer (not shown), the support pin 5 and the support shaft on the apparatus side are brought into contact with the center contact portion 7 of the ground plate 2 to thereby form a photosensitive drum. Unnecessary surface charges charged on 1 were grounded and removed. Here, the support shaft is a shaft that penetrates the photosensitive drum, and the support pins are projecting pins having a length necessary to support the central shaft holes of the resin flanges at both ends of the photosensitive drum. These are also referred to below as the “center axis”.
JP-A-9-114168 JP 2001-75423 A JP 2001-305769 A JP 2002-62759 A JP 2002-116660 A

しかしながら、従来のアース板を用いる方法ではフランジの種類毎に形状や固定方法が異なるため専用のアース板を製作しなければならず、それぞれについて専用の抜き型が必要となることからコストの増大を招いていた。また、樹脂フランジに金属アース板を取り付けて前述のように導電性基体と支持軸または支持ピンとの電気的導通を確保する場合は、金属アース板と支持軸または支持ピンとの接触点からの摺動異常音(ノイズ)の発生、過剰摩耗による導通不良や金属アース板を取りつけたフランジを感光ドラムに嵌合させる際の金属アース板の変形によるフランジの嵌合不良、さらには基体外表面の変形不良などが発生する問題がある。さらに従来の導電性ブラシを使う場合でも、組み立て時間の増大によりコストが上昇するという問題がある。
以上説明した問題点に鑑み、本発明の目的は、導電性基体を接地するための部品の共通化を図り、接地機構を簡単な構造とすることでコストを削減し、金属アース板と支持軸または支持ピンとの接触点から発生する摺動ノイズや金属アース板の過剰摩耗による導通不良、金属アース板の変形によるフランジの嵌合不良や基体外表面の変形不良等に基く画像障害の生じることが少ない接地機構を備える電子写真感光体を提供することである。
However, in the conventional method using a ground plate, the shape and the fixing method are different for each type of flange, so a dedicated ground plate must be manufactured, and a dedicated punching die is required for each. I was invited. If a metal ground plate is attached to the resin flange to ensure electrical continuity between the conductive base and the support shaft or support pin as described above, sliding from the contact point between the metal ground plate and the support shaft or support pin is possible. Abnormal noise (noise), poor continuity due to excessive wear, poor fitting of the flange due to deformation of the metal ground plate when fitting the flange with the metal ground plate to the photosensitive drum, and further deformation of the outer surface of the substrate There is a problem that occurs. Further, even when a conventional conductive brush is used, there is a problem that the cost increases due to an increase in assembly time.
In view of the above-described problems, an object of the present invention is to reduce the cost by using a simple structure for the grounding mechanism by sharing parts for grounding the conductive base, and the metal ground plate and the support shaft. Or, it may cause image failure due to sliding noise generated from the contact point with the support pin, poor conduction due to excessive wear of the metal ground plate, poor fitting of the flange due to deformation of the metal ground plate, or deformation of the outer surface of the substrate. It is an object to provide an electrophotographic photosensitive member having a small number of grounding mechanisms.

特許請求の範囲の請求項1記載の発明によれば、前記目的は、少なくとも円筒状導電性基体と、該基体の開口端部内に嵌合される樹脂フランジとを備え、導電性中心軸に支持される電子写真感光体において、前記基体内に、基体内周面と前記中心軸とに接触し、前記フランジとは別個独立の導電性部品を備える電子写真感光体とすることにより達成される。
すなわち、本発明の電子写真感光体は、フランジの形状等に依存せず、ネジや係止部によりフランジに固定することのない導電性部品を用いることにより前記の目的を達するものである。
請求項2記載の発明によれば、前記導電性部品が、円形プレートであり、前記基体の開口端部内に設けたインロー部端の段差と樹脂フランジの嵌合部端部とに挟まれて基体内に固定される請求項1記載の電子写真感光体とすることが好ましい。
According to the first aspect of the present invention, the object includes at least a cylindrical conductive substrate and a resin flange fitted into the opening end of the substrate, and is supported on the conductive central shaft. In the electrophotographic photosensitive member, the electrophotographic photosensitive member is provided with a conductive component that is in contact with the inner peripheral surface of the substrate and the central axis and is independent of the flange.
That is, the electrophotographic photosensitive member of the present invention achieves the above object by using a conductive component that does not depend on the shape of the flange or the like and is not fixed to the flange by a screw or a locking portion.
According to the second aspect of the present invention, the conductive component is a circular plate, and is sandwiched between a step at the end of the spigot portion provided in the opening end portion of the base and a fitting portion end portion of the resin flange. The electrophotographic photosensitive member according to claim 1 is preferably fixed in the body.

請求項3記載の発明によれば、前記導電性部品が、前記基体の内周面に接する導電性枠体と、この導電性枠体から軸芯に向かい前記中心軸と接触する導電性繊維集合体とを備える請求項1記載の電子写真感光体とすることも好ましい。
請求項4記載の発明によれば、前記枠体は、リング状枠体であり、その外径は前記フランジの嵌合部外径と略同一である請求項3記載の電子写真感光体とすることが好適である。
請求項5記載の発明によれば、前記導電性部品が、前記基体の内周面に接する部分に複数の突起を設けた導電性枠体と、該枠体から軸芯に向かい前記中心軸と接触する導電性繊維集合体とを備え、前記突起により基体内部に固定される請求項1記載の電子写真感光体とすることも好ましい。
According to a third aspect of the present invention, the conductive component includes a conductive frame in contact with the inner peripheral surface of the base, and a conductive fiber assembly in contact with the central axis from the conductive frame toward the axis. It is also preferable that the electrophotographic photosensitive member according to claim 1 further comprises a body.
According to a fourth aspect of the present invention, the frame is a ring-shaped frame, and the outer diameter thereof is substantially the same as the outer diameter of the fitting portion of the flange. Is preferred.
According to the fifth aspect of the present invention, the conductive component includes a conductive frame provided with a plurality of protrusions in a portion in contact with the inner peripheral surface of the base, and the central axis from the frame toward the axis. The electrophotographic photosensitive member according to claim 1, further comprising a conductive fiber assembly in contact with the electrophotographic photosensitive member, wherein the electrophotographic photosensitive member is fixed inside the substrate by the protrusions.

本発明によれば、少なくとも円筒状導電性基体と、該基体の開口端部内に嵌合される樹脂フランジとを備え、導電性中心軸に支持される電子写真感光体において、前記基体内に、基体内周面と前記中心軸とに接触し、前記フランジとは別個独立の導電性部品を備える電子写真感光体としたので、従来の金属アース板と中心軸との接触点から発生した摺動異常音を防止することができ、金属アース板の過剰摩耗による導通不良、金属アース板の変形によるフランジの嵌合不良や基体外表面の変形不良等に基く画像障害の発生を抑制できた。さらには、導電性部品をフランジに取り付けず別部品としたので、部品の共通化が図れ、設計、作製期間などを短縮することができ、その結果コストダウンを図ることができた。   According to the present invention, in an electrophotographic photosensitive member provided with at least a cylindrical conductive substrate and a resin flange fitted in the opening end of the substrate, and supported by a conductive central axis, Since the electrophotographic photosensitive member is in contact with the inner peripheral surface of the substrate and the central axis and is provided with a conductive part independent of the flange, the sliding generated from the contact point between the conventional metal ground plate and the central axis Abnormal noise can be prevented, and the occurrence of image failure based on poor conduction due to excessive wear of the metal ground plate, poor fitting of the flange due to deformation of the metal ground plate, and poor deformation of the outer surface of the substrate can be suppressed. Furthermore, since the conductive parts are not attached to the flanges but are separate parts, the parts can be shared, the design and production period can be shortened, and as a result, the cost can be reduced.

以下、本発明の電子写真感光体に関し、図を用いて詳細に説明する。本発明はその要旨を超えない限り、以下に説明する実施例に限定されるものではない。
図1は本発明にかかる電子写真感光体についてフランジの嵌合前の状態を示す一部破断正面図である。図2は本発明にかかる電子写真感光体の一部破断正面図であり、感光ドラムにフランジを嵌合し支持ピンで支持した状態を示す。図4、図5、図6は本発明にかかる電子写真感光体に用いられる導電性部品の好ましい実施例を示す。
電子写真感光体20は、図1に示すように円筒状の導電性基体上に感光層が形成された感光ドラム11と、このドラムに嵌合される樹脂フランジ13と、導電性部品12とを備えている。この電子写真感光体は、電子写真装置側に固定された支持ピン(中心軸)15により回転自在となるよう装置内に支持される。この支持ピンは樹脂フランジの中心軸孔14を介して感光体を支持し、また電子写真装置を介して接地されている。中心軸としては、前記支持ピンの他に感光ドラムを貫通するタイプの支持軸も用いられる。支持ピンは外径30mm以下の比較的小径の軽い感光ドラムに多く用いられ、支持軸は大径で、重い感光ドラムに多く採用される傾向がある。支持ピン(中心軸)15は、電子写真感光体内に固定された導電性部品と接触することにより接地機構を構成する。
Hereinafter, the electrophotographic photoreceptor of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the examples described below as long as the gist thereof is not exceeded.
FIG. 1 is a partially broken front view showing a state of the electrophotographic photosensitive member according to the present invention before fitting a flange. FIG. 2 is a partially broken front view of the electrophotographic photosensitive member according to the present invention, and shows a state in which a flange is fitted to the photosensitive drum and supported by a support pin. 4, 5 and 6 show preferred embodiments of conductive parts used in the electrophotographic photoreceptor according to the present invention.
As shown in FIG. 1, the electrophotographic photosensitive member 20 includes a photosensitive drum 11 having a photosensitive layer formed on a cylindrical conductive substrate, a resin flange 13 fitted to the drum, and a conductive component 12. I have. The electrophotographic photosensitive member is supported in the apparatus so as to be rotatable by a support pin (center shaft) 15 fixed to the electrophotographic apparatus side. The support pins support the photosensitive member through the central shaft hole 14 of the resin flange and are grounded through the electrophotographic apparatus. In addition to the support pins, a support shaft of a type that penetrates the photosensitive drum is also used as the central shaft. The support pins are often used for light photosensitive drums having a relatively small diameter with an outer diameter of 30 mm or less, and the support shaft has a large diameter and tends to be frequently used for heavy photosensitive drums. The support pin (center shaft) 15 constitutes a grounding mechanism by coming into contact with conductive parts fixed in the electrophotographic photosensitive member.

導電性基体としては、JIS6063などで規定されるアルミニウム合金が好ましく用いられ、その大きさは例えば直径24mm、長さ257mmである。このような形状に加工した円筒状基体(素管)の外周面上に所要の光導電性材料を含有する感光層を被覆して感光ドラム11とする。
この感光ドラム11の開口端部には、あらかじめインロー部16が形成されており、その軸方向の深さは樹脂フランジ13の嵌合部の軸方向長さと導電性部品12の厚みの和に相当する。このインロー部16は通常、ドラム端部のフランジを嵌合する部分の内径精度を高めるために形成されるが、本発明ではさらに、導電性部品をドラム内に固定するための位置決め(段差)を提供するものである。さらに、このインロー部の深さをフランジの嵌合部の軸方向長さに応じて調整することにより、異なるフランジを装着する様々な感光体に本発明の導電性部品を共通して適用することができる。但し、このインロー部16を設けなくても、導電性部品側に突起部等を設けドラム内に固定できるようにすることもできるので、インロー部は本発明の必須の要件ではない。
As the conductive substrate, an aluminum alloy specified by JIS6063 or the like is preferably used, and its size is, for example, a diameter of 24 mm and a length of 257 mm. A photosensitive layer containing a required photoconductive material is coated on the outer peripheral surface of the cylindrical substrate (element tube) processed into such a shape to obtain a photosensitive drum 11.
An inlay portion 16 is formed in advance at the opening end of the photosensitive drum 11, and the axial depth thereof corresponds to the sum of the axial length of the fitting portion of the resin flange 13 and the thickness of the conductive component 12. To do. The inlay portion 16 is usually formed in order to increase the accuracy of the inner diameter of the portion where the flange at the end of the drum is fitted. However, in the present invention, a positioning (step) for fixing the conductive part in the drum is further provided. It is to provide. Furthermore, the conductive parts of the present invention can be commonly applied to various photoreceptors to which different flanges are mounted by adjusting the depth of the inlay portion according to the axial length of the fitting portion of the flange. Can do. However, the inlay portion is not an indispensable requirement of the present invention, because it is possible to provide a protrusion or the like on the conductive component side and fix it in the drum without providing the inlay portion 16.

なお、図1に示す電子写真感光体では樹脂フランジ13は感光ドラム11の一方の開口端部のみに嵌合されるようになっているが、実際には両端部に樹脂フランジが嵌合される。その際、図1に示すギヤ付き樹脂フランジ13がいずれか一方の端部に嵌合される場合には、他方側の樹脂フランジにはギヤ無しフランジを用いてもよい(図2の符号17参照)。これら樹脂フランジの材料としてはポリカーボネート樹脂やポリアセタール樹脂が好ましく用いられる。
導電性部品12としては、円形プレートや導電性繊維集合体を備えるリング状導電性枠体(以下「導電性ブラシ」ともいう。)を用いることができる。円形プレートの形状を図4に、導電性ブラシの好適形状を図5(a)〜(d)と図6(e)に示す。これら部品の形状は、ドラム11の内周面と摺動可能でドラム内に固定でき、かつ中心軸の周りに回転自在に接触するようなものとする。
In the electrophotographic photosensitive member shown in FIG. 1, the resin flange 13 is fitted to only one opening end of the photosensitive drum 11, but actually the resin flange is fitted to both ends. . In this case, when the geared resin flange 13 shown in FIG. 1 is fitted to one of the ends, a gearless flange may be used as the other resin flange (see reference numeral 17 in FIG. 2). ). A polycarbonate resin or polyacetal resin is preferably used as a material for these resin flanges.
As the conductive component 12, a ring-shaped conductive frame (hereinafter also referred to as “conductive brush”) including a circular plate or a conductive fiber assembly can be used. The shape of the circular plate is shown in FIG. 4, and the preferred shape of the conductive brush is shown in FIGS. 5 (a) to 5 (d) and FIG. 6 (e). The shapes of these parts are such that they can slide on the inner peripheral surface of the drum 11 and can be fixed in the drum, and can rotate around the central axis.

円形プレート120と導電性ブラシのリング状枠体121、122、129、130には、導電性樹脂や剛性を有する金属材料が用いられる。樹脂としては導電性ポリアセタール樹脂や導電性ポリカーボネート樹脂、金属としてはステンレススチールが好ましい。特に図5(c)に示すリング状枠体122は円筒状基体に径を縮めて挿入するので、弾性力を有する金属が好ましい。そのような金属としては冷間加工により弾性力を持たせたステンレススチールが好ましい。なお、図5(d)に示すリング状枠体129としては、導電性繊維集合体の支持体としての機能があればよいので、前記導電性樹脂、金属に加え、絶縁樹脂等も使用できる。
導電性繊維としては、前述の金属細線の他、導電性ポリエチレンテレフタレート繊維、炭素繊維等を採用できる。
A conductive resin or a rigid metal material is used for the circular plate 120 and the ring-shaped frame bodies 121, 122, 129, and 130 of the conductive brush. The resin is preferably a conductive polyacetal resin or conductive polycarbonate resin, and the metal is preferably stainless steel. In particular, the ring-shaped frame 122 shown in FIG. 5C is inserted into a cylindrical base with a reduced diameter, and therefore a metal having elasticity is preferable. Such a metal is preferably stainless steel given an elastic force by cold working. Note that the ring-shaped frame 129 shown in FIG. 5D only needs to have a function as a support for the conductive fiber assembly, so that an insulating resin or the like can be used in addition to the conductive resin and metal.
As the conductive fiber, conductive polyethylene terephthalate fiber, carbon fiber, and the like can be employed in addition to the above-described fine metal wires.

円形プレート120の形状は、その外周形状については前述のとおりドラム内に固定できるようなものとすればよいが、中心軸と接触する部分については中心軸の種類により適宜変更する必要がある。すなわち、図1に示す支持ピン15を用いる場合には円形プレートは板状で、支持ピンとの接触部位に凹部を適宜設けた形状とし、感光体を貫通する支持軸を用いる場合には円形プレートをドーナツ形状とする。ドーナツ形状とする場合には、その内径を支持軸と回転自在に、かつ電気的に接触するような径とする。むろん、支持ピンを用いる場合にも、その周りに回転自在に電気接触するような内径を有するドーナツ状円形プレートを用い、支持ピンを円形プレートに貫通させてもよい。
導電性ブラシ(a)はリング状枠体121の内側に、導電性繊維集合体123を植毛したリング状導電性ブラシである。繊維集合体は、リング状枠体の中心(軸芯)に向かい、リングの内径の約2分の1弱の長さを持つステンレススチール金属細線集合体であり、均一に植毛される(植毛密度100〜5000本/cm)。
The shape of the circular plate 120 may be such that the outer peripheral shape thereof can be fixed in the drum as described above, but the portion in contact with the central axis needs to be appropriately changed depending on the type of the central axis. That is, when the support pin 15 shown in FIG. 1 is used, the circular plate is plate-shaped, and a concave portion is appropriately provided at a contact portion with the support pin. When the support shaft that penetrates the photoconductor is used, the circular plate is used. Donut shape. In the case of a donut shape, the inner diameter is set so as to be rotatable and electrically in contact with the support shaft. Of course, when using a support pin, a donut-shaped circular plate having an inner diameter that allows electrical contact to be freely rotated around the support pin may be used, and the support pin may be passed through the circular plate.
The conductive brush (a) is a ring-shaped conductive brush in which a conductive fiber assembly 123 is planted inside the ring-shaped frame 121. The fiber assembly is a stainless steel metal fine wire assembly that is directed to the center (axial core) of the ring-shaped frame and has a length of about half the inner diameter of the ring. 100-5000 pieces / cm < 2 >).

導電性ブラシ(b)は、導電性繊維集合体124としてその長さがリング状枠体121の内径の約2分の1より長い金属細線を用い、金属細線の側面で前記支持ピンと接触するようにしたリング状導電性ブラシである。この点で、主に金属細線の先端で支持ピンと接触する導電性ブラシ(a)と異なっている。
導電性ブラシ(c)は、ドラムの内径より外径を大きくしたリング状枠体の一部を欠き取って切れ目126を設け、残るリング状枠体122の内側に導電性ブラシ(a)と同様の金属細線集合体125を植毛した導電性ブラシである。
導電性ブラシ(d)は、リング状枠体129から外方に向かいドラムの内周面に接触する金属細線集合体127と、軸芯に向かい中心軸と接触する金属細線集合体128とを備える導電性ブラシである。金属細線集合体127、128はそれぞれリング状枠体129に別々に植毛されてもよいし、枠体129の植毛面に形成した貫通孔を利用して形成してもよい。この導電性ブラシ(d)は金属細線集合体が円筒状基体と中心軸との電気的導通を担うので、リング状枠体129の外径は前記円筒状基体の内径より小さくされる。
The conductive brush (b) uses a fine metal wire having a length longer than about one half of the inner diameter of the ring-shaped frame body 121 as the conductive fiber assembly 124, and is in contact with the support pin on the side surface of the fine metal wire. This is a ring-shaped conductive brush. In this respect, it differs from the conductive brush (a) which comes into contact with the support pin mainly at the tip of the fine metal wire.
In the conductive brush (c), a part of the ring-shaped frame body having an outer diameter larger than the inner diameter of the drum is cut off to provide a cut 126, and the remaining inside the ring-shaped frame body 122 is the same as the conductive brush (a). This is a conductive brush in which the metal thin wire assembly 125 is implanted.
The conductive brush (d) includes a metal thin wire assembly 127 that faces outward from the ring-shaped frame 129 and contacts the inner peripheral surface of the drum, and a metal thin wire assembly 128 that contacts the central axis toward the axial center. It is a conductive brush. The thin metal wire assemblies 127 and 128 may be separately planted in the ring-shaped frame 129, or may be formed using through holes formed in the planted surface of the frame 129. In this conductive brush (d), since the metal thin wire assembly is responsible for electrical continuity between the cylindrical base and the central axis, the outer diameter of the ring-shaped frame 129 is made smaller than the inner diameter of the cylindrical base.

図6に示す導電性ブラシ(e)は、導電性ブラシ(a)または(b)のリング状枠体の側面に突起部を設けたものである。導電性ブラシ(e)の枠体の外径と突起部の高さは、このブラシが基体内面に摺動可能に固定されるような大きさとする。なお、この導電性ブラシを用いる場合には、突起部によりこれを基体内に固定することができるので、インロー部付きの円筒状基体を用いなくてもよい利点がある。
なお、以上のリング状導電性ブラシ(a)〜(e)の金属細線集合体は、図ではリング状枠体の内周面、外周面に一様に植毛されるように示されているが、必ずしも全周に一様である必要はない。要するに、感光体が中心軸周りに回転する際、金属細線と中心軸との接触による異常摩耗や摺動異常音(ノイズ)が発生せず、また金属細線が互いに絡まなければよいのである。
The conductive brush (e) shown in FIG. 6 has a protrusion on the side surface of the ring-shaped frame of the conductive brush (a) or (b). The outer diameter of the frame of the conductive brush (e) and the height of the protrusions are set such that the brush is slidably fixed to the inner surface of the base. In addition, when using this electroconductive brush, since this can be fixed in a base | substrate with a projection part, there exists an advantage which does not need to use the cylindrical base | substrate with an inlay part.
In addition, although the metal thin wire | line aggregate | assembly of the above ring-shaped electroconductive brush (a)-(e) is shown in the figure so that it may be flocked uniformly on the inner peripheral surface and outer peripheral surface of a ring-shaped frame. It is not always necessary to be uniform over the entire circumference. In short, when the photosensitive member rotates around the central axis, abnormal wear and sliding noise (noise) due to contact between the fine metal wires and the central shaft do not occur, and the fine metal wires need not be entangled with each other.

感光体を組み立てるには、上記のいずれかの導電性部品、例えば図5(a)の導電性ブラシを、感光ドラムの開口端部に形成したインロー部に樹脂フランジに先立って挿入し、その後樹脂フランジを圧入治具を用いて嵌合する。他方の開口端部にも樹脂フランジを嵌合すると電子写真感光体となる。感光体は、図1、2に示すように装置側に固定される支持ピン15を中心軸孔14に挿入することにより、電子写真装置に搭載される。
また、図5(c)の導電性ブラシを感光ドラム11に挿入する時は、この導電性ブラシ(c)のリング状枠体122の外径はインロー部16の内径より大きいので、リング状枠体122の切れ目126を利用してその外径を縮めてからインロー部16へ挿入する。このようにして挿入された導電性ブラシはリング状枠体122の弾性力により、強固に感光ドラム11の基体内面に接触するので、基体との電気的接触がいっそう確実になるメリットがある。
In order to assemble the photoreceptor, any of the above-described conductive parts, for example, the conductive brush shown in FIG. 5A, is inserted into the spigot formed at the opening end of the photosensitive drum prior to the resin flange, and then the resin Fit the flange using a press-fitting jig. When a resin flange is fitted to the other opening end, an electrophotographic photosensitive member is obtained. As shown in FIGS. 1 and 2, the photosensitive member is mounted on the electrophotographic apparatus by inserting support pins 15 fixed to the apparatus side into the central shaft hole 14.
When the conductive brush shown in FIG. 5C is inserted into the photosensitive drum 11, the outer diameter of the ring-shaped frame 122 of the conductive brush (c) is larger than the inner diameter of the spigot portion 16, so that the ring-shaped frame The outer diameter of the body 122 is reduced using the cut 126 and then inserted into the spigot 16. Since the conductive brush inserted in this way firmly contacts the inner surface of the substrate of the photosensitive drum 11 due to the elastic force of the ring-shaped frame 122, there is an advantage that the electrical contact with the substrate is further ensured.

図5(d)、図6(e)の導電性ブラシを感光ドラムに挿入する時は、これらの導電性ブラシのリング状枠体129、130の外径はインロー部の内径より小さいので、前記導電性ブラシ(a)〜(c)よりは容易に感光ドラムに挿入できる。しかし、感光ドラムの基体内面との接触はリング状枠体の外周に形成された金属細線127又は突起部131により行なわれるので、電気的導通は確実に確保できる。
また、上記導電性ブラシ(a)〜(e)は従来のアース板のように樹脂フランジに固定され一体化されることはないので、組み立てが容易である。さらに感光ドラムの径が同一で中心軸の径が異なる場合、従来のアース板では設計のやり直しと、高価な金型を新たに起こす必要があったが、本発明の導電性部品は中心軸径の異なるものに対しても共通して使用できる経済的メリットもある。
When the conductive brushes of FIGS. 5D and 6E are inserted into the photosensitive drum, the outer diameters of the ring-shaped frame bodies 129 and 130 of these conductive brushes are smaller than the inner diameter of the spigot portion. It can be inserted into the photosensitive drum more easily than the conductive brushes (a) to (c). However, since the contact with the inner surface of the substrate of the photosensitive drum is performed by the fine metal wire 127 or the protrusion 131 formed on the outer periphery of the ring-shaped frame body, electrical conduction can be ensured reliably.
Further, the conductive brushes (a) to (e) are fixed to the resin flange and are not integrated as in the case of a conventional earth plate, so that the assembly is easy. Furthermore, when the diameter of the photosensitive drum is the same and the diameter of the central axis is different, the conventional earth plate had to be redesigned and a new expensive mold had to be generated. There is also an economic advantage that can be used in common for different things.

これらの導電性ブラシを備える電子写真感光体を装置に搭載すると導電性ブラシの金属細線と支持ピンが電気的に接触する。(a)、(c)、(d)、(e)の各導電性ブラシを用いる場合には、金属細線の先端付近が支持ピンと接触するが、導電性ブラシ(b)の場合には、金属細線が長いのでその先端付近ではなくサイドが支持ピンに接触する。この導電性ブラシ(b)の場合は金属細線の根元側から先端に向かう方向に感光体を回転するように中心軸を接触させると金属細線が絡まないので好ましい。
円形プレートを用いる場合には、金属細線を用いることがないのでさらに簡単な接地機構により電気的接触を確保することができる。
つぎに本発明の電子写真感光体を評価した結果を以下に説明する。
(実験例1)
外径24.00mm、長さ257mmのアルミニウム製素管の端部に深さ10mmのインロー部を設け、その内径を23.00mmとし、その他の部分の内径を22.50mmに加工して基体とした。この基体に感光層を積層させ感光ドラムとした。このドラムのインロー部を設けた端部に、厚さ5mm、外径22.98mmのアルミニウム製円形プレートを挿入し、次いで嵌合部の軸方向長さが5mm、嵌合径が23.05mmであるポリカーボネート製フランジを圧入、嵌合した。これにより円形プレートは、インロー部の段差とフランジの嵌合部端部に挟まれ感光ドラム内に固定された(図2参照)。このように電子写真感光体を作製した。
(実験例2)
実験例1の円形プレートの替わりに、図5(a)で示す導電性ブラシを用いた以外は実験例1と同じ構成で電子写真感光体を作製した。なお、導電性ブラシの枠体の材料にはアルミニウムを、導電性繊維にはSUS304を用いた。
(実験例3)
実験例1の円形プレートの替わりに、図6(e)で示す導電性ブラシを用いた以外は実験例1と同じ構成で電子写真感光体を作製した。なお、導電性ブラシの枠体の材料にはアルミニウムを、導電性繊維にはSUS304を用い、枠体の外径、幅をそれぞれ23.03,2mmとした。また、枠体の側面には径方向の高さが0.1mmである突起を等間隔に4個設けた。
(比較実験例)
従来のアース板をフランジに取り付けて固定し、感光ドラムに圧入、嵌合した以外は実験例1と同じ構成で電子写真感光体を作製した。
When an electrophotographic photosensitive member having these conductive brushes is mounted on the apparatus, the fine metal wires of the conductive brush and the support pins are in electrical contact. When the conductive brushes (a), (c), (d), and (e) are used, the vicinity of the tip of the thin metal wire is in contact with the support pin, but in the case of the conductive brush (b) Since the thin wire is long, the side contacts the support pin, not near the tip. In the case of this conductive brush (b), it is preferable to contact the central axis so that the photoreceptor rotates in the direction from the base side to the tip of the fine metal wire because the fine metal wire does not get entangled.
In the case of using a circular plate, it is possible to ensure electrical contact with a simpler grounding mechanism because a metal thin wire is not used.
Next, the results of evaluating the electrophotographic photoreceptor of the present invention will be described below.
(Experimental example 1)
An inlay portion having a depth of 10 mm is provided at the end of an aluminum tube having an outer diameter of 24.00 mm and a length of 257 mm, the inner diameter thereof is set to 23.00 mm, and the inner diameter of the other portion is processed to 22.50 mm. did. A photosensitive layer was laminated on this substrate to form a photosensitive drum. An aluminum circular plate having a thickness of 5 mm and an outer diameter of 22.98 mm is inserted into the end portion of the drum provided with an inlay portion, and then the axial length of the fitting portion is 5 mm and the fitting diameter is 23.05 mm. A polycarbonate flange was press-fitted and fitted. As a result, the circular plate was sandwiched between the step of the inlay portion and the end of the fitting portion of the flange and fixed in the photosensitive drum (see FIG. 2). Thus, an electrophotographic photosensitive member was produced.
(Experimental example 2)
Instead of the circular plate of Experimental Example 1, an electrophotographic photosensitive member was produced with the same configuration as that of Experimental Example 1 except that the conductive brush shown in FIG. 5A was used. In addition, aluminum was used for the material of the frame of the conductive brush, and SUS304 was used for the conductive fiber.
(Experimental example 3)
Instead of the circular plate of Experimental Example 1, an electrophotographic photosensitive member having the same configuration as that of Experimental Example 1 was prepared except that the conductive brush shown in FIG. In addition, aluminum was used for the material of the frame of the conductive brush, SUS304 was used for the conductive fiber, and the outer diameter and width of the frame were 23.03 and 2 mm, respectively. Further, four protrusions having a radial height of 0.1 mm were provided at equal intervals on the side surface of the frame.
(Comparative experiment example)
An electrophotographic photosensitive member was produced in the same configuration as in Experimental Example 1 except that a conventional ground plate was fixed by being attached to the flange, and was press-fitted and fitted into the photosensitive drum.

以上の実験例1〜3と比較実験例で作製した電子写真感光体を市販のプリンター装置に搭載して、1万枚の連続繰り返し印刷を行った。そして、基体と装置との導通状態(接地状態)、摺動異常音(ノイズ)と画像障害について評価を行った。その結果、いずれの場合においても導通不良、異常音発生はなく、画像は良好であった。
以上のことから、本発明にかかる電子写真感光体によれば、従来のアース板を用いた感光体と同等の導通特性等を得られることが分った。さらに、導電性部品をフランジと別にすることが可能となり、導通部品の共通化が図れ、設計、作製期間などを短縮することができ、その結果コストダウンを図ることができた。
The electrophotographic photoreceptors produced in the above Experimental Examples 1 to 3 and Comparative Experimental Example were mounted on a commercially available printer device, and 10,000 continuous printings were performed. Then, the conductive state (ground state) between the substrate and the apparatus, abnormal sliding noise (noise), and image failure were evaluated. As a result, in either case, there was no poor conduction and no abnormal noise, and the image was good.
From the above, it has been found that the electrophotographic photosensitive member according to the present invention can obtain the same conduction characteristics as a conventional photosensitive member using a ground plate. In addition, the conductive parts can be separated from the flange, and the conductive parts can be made common, thereby shortening the design and manufacturing period, thereby reducing the cost.

本発明にかかる電子写真感光体について、フランジの嵌合前の状態を示す一部破断正面図である。It is a partially broken front view which shows the state before the fitting of a flange about the electrophotographic photosensitive member concerning this invention. 本発明にかかる電子写真感光体の一部破断正面図である。1 is a partially cutaway front view of an electrophotographic photoreceptor according to the present invention. 従来の電子写真感光体について、フランジの嵌合前の状態を示す一部破断正面図である。It is a partially broken front view which shows the state before the fitting of a flange about the conventional electrophotographic photoreceptor. 本発明にかかる電子写真感光体に用いられる円形プレートの好ましい例の斜視図および上面図(A矢視図)である。It is the perspective view and top view (A arrow line view) of the preferable example of the circular plate used for the electrophotographic photoreceptor concerning this invention. 本発明にかかる電子写真感光体に用いられるリング状導電性ブラシの好ましい例の上面図である。It is a top view of a preferable example of a ring-shaped conductive brush used for the electrophotographic photosensitive member according to the present invention. 本発明にかかる電子写真感光体に用いられるリング状導電性ブラシの好ましい例の斜視図および上面図(B矢視図)である。It is the perspective view and top view (B arrow view) of the preferable example of the ring-shaped electroconductive brush used for the electrophotographic photoreceptor concerning this invention.

符号の説明Explanation of symbols

1,11 感光ドラム
12 導電性部品
3,13,17 樹脂フランジ
4,14 中心軸孔
5,15 支持ピン(中心軸)
6,16 インロー部
10,20 電子写真感光体
2 金属アース板
7 中心接触部
8 外周接触部
120 円形プレート
121,129,130 リング状枠体
122 切れ目付きリング状枠体
123〜125 導電性繊維
127,128,132 導電性繊維
126 切れ目
131 突起部
1,11 Photosensitive drum 12 Conductive parts 3,13,17 Resin flange 4,14 Center shaft hole 5,15 Support pin (center shaft)
6,16 Inner portion 10,20 Electrophotographic photosensitive member 2 Metal ground plate 7 Center contact portion 8 Outer peripheral contact portion 120 Circular plate 121,129,130 Ring-shaped frame 122 Ring-shaped frame 122 with breaks 123-125 Conductive fiber 127 , 128, 132 Conductive fiber 126 Cut 131 Protrusion

Claims (5)

少なくとも円筒状導電性基体と、該基体の開口端部内に嵌合される樹脂フランジとを備え、導電性中心軸に支持される電子写真感光体において、前記基体内に、基体内周面と前記中心軸とに接触し、前記フランジとは別個独立の導電性部品を備えることを特徴とする電子写真感光体。 In an electrophotographic photosensitive member provided with at least a cylindrical conductive base and a resin flange fitted into the opening end of the base, and supported by a conductive central axis, the base inner peripheral surface and the base An electrophotographic photosensitive member comprising a conductive part that contacts a central axis and is independent of the flange. 前記導電性部品が、円形プレートであり、前記基体の開口端部内に設けたインロー部端の段差と樹脂フランジの嵌合部端部とに挟まれて基体内に固定されることを特徴とする請求項1記載の電子写真感光体。 The conductive component is a circular plate, and is fixed in the base body by being sandwiched between a step of an inlay part end provided in an opening end part of the base body and a fitting part end part of a resin flange. The electrophotographic photosensitive member according to claim 1. 前記導電性部品が、前記基体の内周面に接する導電性枠体と、この導電性枠体から軸芯に向かい前記中心軸と接触する導電性繊維集合体とを備えることを特徴とする請求項1記載の電子写真感光体。 The conductive part includes a conductive frame in contact with an inner peripheral surface of the base body, and a conductive fiber assembly in contact with the central axis from the conductive frame toward an axis. Item 2. The electrophotographic photosensitive member according to Item 1. 前記枠体は、リング状枠体であり、その外径は前記フランジの嵌合部外径と略同一であることを特徴とする請求項3記載の電子写真感光体。 4. The electrophotographic photosensitive member according to claim 3, wherein the frame is a ring-shaped frame, and an outer diameter thereof is substantially the same as an outer diameter of the fitting portion of the flange. 前記導電性部品が、前記基体の内周面に接する部分に複数の突起を設けた導電性枠体と、該枠体から軸芯に向かい前記中心軸と接触する導電性繊維集合体とを備え、前記突起により基体内部に固定されることを特徴とする請求項1記載の電子写真感光体。 The conductive component includes a conductive frame provided with a plurality of protrusions at a portion in contact with the inner peripheral surface of the base, and a conductive fiber assembly that contacts the central axis from the frame toward the axis. 2. The electrophotographic photosensitive member according to claim 1, wherein the electrophotographic photosensitive member is fixed inside the substrate by the protrusions.
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008076466A (en) * 2006-09-19 2008-04-03 Konica Minolta Business Technologies Inc Tandem-type color image forming apparatus and color image forming method using the same
JP2012083505A (en) * 2009-10-27 2012-04-26 Ricoh Co Ltd Rotor energization mechanism, image carrier unit, process cartridge, belt unit, fixing unit, sheet conveyance unit, image forming device, rotor energization method, and conductive member
CN101308342B (en) * 2007-05-17 2012-12-19 Ntn株式会社 Grounding device of sensitometric drum and sensitometric drum unit of image forming device
WO2013094770A3 (en) * 2011-12-19 2013-08-08 Canon Kabushiki Kaisha Cartridge with electric contact of electroconductive resin
CN106100246A (en) * 2015-04-22 2016-11-09 雷勃美国公司 Grounding apparatus and assemble method thereof for motor
EP2317394B1 (en) * 2009-10-27 2017-05-10 Ricoh Company Ltd. Mechanism for Electrifying, Method of Electrifying, and Conductive Member

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008076466A (en) * 2006-09-19 2008-04-03 Konica Minolta Business Technologies Inc Tandem-type color image forming apparatus and color image forming method using the same
CN101308342B (en) * 2007-05-17 2012-12-19 Ntn株式会社 Grounding device of sensitometric drum and sensitometric drum unit of image forming device
JP2012083505A (en) * 2009-10-27 2012-04-26 Ricoh Co Ltd Rotor energization mechanism, image carrier unit, process cartridge, belt unit, fixing unit, sheet conveyance unit, image forming device, rotor energization method, and conductive member
EP2317394B1 (en) * 2009-10-27 2017-05-10 Ricoh Company Ltd. Mechanism for Electrifying, Method of Electrifying, and Conductive Member
WO2013094770A3 (en) * 2011-12-19 2013-08-08 Canon Kabushiki Kaisha Cartridge with electric contact of electroconductive resin
US9052675B2 (en) 2011-12-19 2015-06-09 Canon Kabushiki Kaisha Cartridge
CN106100246A (en) * 2015-04-22 2016-11-09 雷勃美国公司 Grounding apparatus and assemble method thereof for motor
EP3086448B1 (en) * 2015-04-22 2022-08-03 Regal Beloit America, Inc. Grounding device for electric machine and methods of assembling the same

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