JP2006072039A - Electrophotographic photoreceptor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor which formes a photosensitive layer via the anode oxide film on the surface of a conductive base, and has a grounding plate with projections, to stably and reliably connect to the conductive base, without providing the step of removing or peeling the anode oxide film on the inner surface of the base. <P>SOLUTION: This electrophotographic photoreceptor has a resin flange which has a grounding plate. This flange has projections which are formed on the outer surface of a conductive elastic object with two or more sharp tips overlapping each other, as seen in a press-in direction, so the they are pressed in by sliding on the same line on the inner surface of the above cylindrical base and are separated from each another, as seen in the direction of crossing the press-in direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement of an electrophotographic photosensitive member mounted on an electrophotographic apparatus such as an electrophotographic copying machine, an electronic printer, and a facsimile, and in particular, a metal used for connecting a cylindrical electrophotographic photosensitive member to a ground potential. It relates to the improvement of the ground plate.

  The image forming function in an electrophotographic apparatus is a cylindrical electrophotographic photosensitive member that rotates around a central axis (hereinafter referred to as a supporting shaft body or shaft, in particular, a supporting shaft that does not penetrate the entire photosensitive member is referred to as a pin), and in the vicinity of its outer surface. The functions of the electrophotographic process member placed opposite to the electrophotographic process member, that is, the electrophotographic process in which each process step such as charging, exposure, development, transfer, (fixing), cleaning and static elimination is performed on the surface of the electrophotographic photosensitive member. It is executed by performing the process functions in order. The rotational force of the electrophotographic photosensitive member transmits the rotational driving force on the apparatus side to a gear (gear) portion integrally formed with an insulating resin flange that is firmly press-fitted into the opening end of the photosensitive member. Is obtained. Further, in order to execute the electrophotographic process function satisfactorily without hindrance, a conductive substrate, which is a supporting substrate of the photoconductor, is grounded in order to selectively release the charge charged on the surface of the electrophotographic photoconductor. It is necessary to drop it. Specifically, the support shaft connected to the ground potential on the apparatus side and the conductive base are electrically and electrically connected.

  In general, the electrophotographic photosensitive member having a small diameter has a large demand in the market and is produced in a large amount. Therefore, a resin material is often used for the material of the small-diameter flange used in consideration of the cost. Since the resin flange has high insulation, as described above, a conductive grounding member that is used by being fixed to the insulating resin flange interposed between the conductive base and the support shaft is necessary to electrically connect the conductive base and the support shaft. And

  Such a conventional electrophotographic photosensitive member is shown in FIG. FIG. 2A shows the photosensitive drum 11 before assembly, the resin flange 12 with the ground plate 13, and the pin-shaped support shaft 14 which is a component on the electrophotographic apparatus side. In the figure, the photosensitive drum 11 shows its cross section, the resin flange 12 shows its side, and the pin-shaped support shaft 14 shows its cross section. The resin flange 12 with the ground plate 13 is press-fitted into the opening end 111 of the photosensitive drum 11, and both are firmly fixed using an adhesive as necessary. The outer diameter of the resin flange 12 on the press-fitting side is slightly larger than the inner diameter of the photosensitive drum 11. Further, a ground plate 13 formed of a thin plate of a conductive elastic material such as phosphor bronze is fixed to the press-fitting side end face of the resin flange 12, and a protrusion 131 formed on the outer peripheral portion thereof is press-fitted into the resin flange 12. Since it protrudes further outward than the side outer diameter, the inner peripheral surface of the photosensitive drum 11 is slidably contacted by the tip of the projection 131 during press-fitting, and can reliably and stably contact the aluminum-based metal substrate. . On the other hand, the pin-shaped support shaft 14 serving as the central axis is often made of a stainless steel material such as SUS304. The central protrusion 132 of the ground plate 13 contacts the pin-shaped support shaft 14. Since the pin-shaped support shaft 14 and the central projection 132 are relatively in contact with each other in a rotational state, the pin-shaped support shaft 14 is in elastic contact so as to ensure electrical connection. An example of the shape of the ground plate made of such a conductive elastic body is shown in a plan view in FIG. With regard to such a ground plate, many other shapes have already been announced and are publicly known. Most of them are formed by punching and bending a metal elastic body such as phosphor bronze or stainless steel such as JIS standard SUS304 (Patent Documents 1 to 4).

Meanwhile, the outer surface of the electrophotographic photosensitive member is coated with a photosensitive layer including a photoconductive layer. In recent years, organic materials are generally used as the material for the photosensitive layer. Between such a photosensitive layer containing an organic material as a main component and a conductive substrate, injection of unnecessary charges from the conductive substrate to the photosensitive layer is prevented, defect coating on the substrate surface, improvement in adhesion of the photosensitive layer, etc. An undercoat layer is often formed for the purpose. An example of such an undercoat layer having an excellent function in various environments is an anodized film formed on the surface of an aluminum-based metal substrate by an anodizing method.
Japanese Patent Laid-Open No. 10-282839 Japanese Patent Laid-Open No. 11-352831 JP-A-8-262925 Japanese Patent Laid-Open No. 2001-92306

  However, when the conductive substrate is an aluminum-based metal substrate, an aluminum oxide-based film is formed as an anodized film. However, the properties of this film are usually higher than that of the aluminum-based metal as the substrate material. It has the feature of being highly insulating. Further, since the anodic oxide film is formed by immersing the cylindrical substrate in a sulfuric acid solution or an oxalic acid solution, not only the outer surface of the cylindrical substrate but also the entire surface including the inner peripheral surface is covered with the anodic oxide film. become. Therefore, in the electrophotographic photosensitive member in which the anodic oxide film formed on the outer surface of the aluminum-based metal base is used as the undercoat layer and the photosensitive layer is laminated thereon, the cylindrical shape corresponding to the press-fitted portion of the resin flange as described above. Without removing the anodic oxide film on the inner peripheral part on the substrate side, the anodic oxide film has a high hardness when press-fitted with a resin flange with a grounding plate having a conventional protrusion, so that the stability by the ground plate A good conductive connection may not be obtained. In addition, the outer surface of the metal base is affected by the press-fitting of the protrusions even if conductive connection is possible by increasing the protrusion of the ground plate or increasing the strength by increasing the thickness of the ground plate. It is difficult to adopt this method because there is a high possibility of deformation. For this reason, in an electrophotographic photosensitive member having an anodic oxide film as an undercoat layer, the anodic oxide film deposited on the inner peripheral surface of the opening end of the cylindrical substrate is usually removed by etching or laser light. I needed it. However, since such partial removal of the oxide film is costly, it is possible to obtain a stable and favorable conductive connection without performing laser light peeling or etching of such an anodic oxide film from the viewpoint of cost reduction. Is also desirable.

  The present invention has been made in view of the above points, and an object of the present invention is an electrophotographic photoreceptor in which a photosensitive layer is formed via an anodized film formed on the surface of a conductive substrate. However, an electrophotographic photosensitive member having a ground plate having a protrusion having a shape capable of stably and reliably conducting with a conductive substrate without providing a step of removing or peeling off the anodic oxide film on the inner peripheral surface of the substrate. Is to provide a body.

  According to the first aspect of the present invention, a conductive cylindrical substrate whose outer surface is coated with a photosensitive layer via an anodized film, and press-fitted into the inner peripheral surface of the open end of the cylindrical substrate. A resin flange to be fitted, a conductive central shaft passing through the resin flange, and the cylindrical base body are fixed to the resin flange for conductive connection to each other. An electrophotographic photosensitive member comprising a conductive elastic body that is in sliding contact with the inner peripheral surface of a cylindrical substrate, wherein the protrusion formed on the outer peripheral portion of the conductive elastic body has two or more pointed tips, and two The two or more pointed tips are overlapped at one point when seen from the press-fitting direction so that the pointed tips are slidably pressed on the same line of the inner peripheral surface of the cylindrical base body, Two or more pointed tips viewed from the right angle direction By the electrophotographic photosensitive member has a shape that is apart from each other, the object of the present invention can be achieved.

  That is, in the present invention, when the conductive elastic body is fixed to the flange, the imaginary straight line connecting the two or more pointed tips and the center line (that is, the rotation axis) of the flange are parallel to each other. The protrusion is configured such that the distance between the two lines is slightly larger than the inner diameter of the cylindrical base. If the protrusions are configured in this way, the set of pointed tips are scratched by overlapping the inner peripheral surface of the base by pressing the flange straight into the base, thereby making a single deep scratch. As a result, the electrical contact between the substrate and the conductive elastic body is ensured.

  According to the present invention as set forth in claim 2, the electrophotographic photosensitive member according to claim 1, wherein the conductive elastic body is formed of a single metal elastic body. preferable.

  According to the third aspect of the present invention, the electrophotographic photosensitive member according to the first aspect of the present invention may be configured such that the conductive elastic body is formed of a plurality of metal elastic bodies. .

  According to the present invention as set forth in claim 4 of the claims, a plurality of protrusions are formed on the outer peripheral portion of the conductive elastic body according to any one of claims 1 to 3. An electrophotographic photoreceptor is more preferable.

  According to the present invention as set forth in claim 5, the electrophotographic photosensitive member according to claim 4, wherein the conductive elastic body is a plate material mainly composed of phosphor bronze or elastic stainless steel. It is desirable to do.

  According to the present invention as set forth in claim 6, it is more desirable to make the electrophotographic photosensitive member according to claim 5 wherein the resin flange material is a polyacetal resin or a polycarbonate resin.

  According to the present invention, even in an electrophotographic photosensitive member in which a photosensitive layer is formed via an anodized film formed on the surface of a conductive substrate, the step of removing or stripping the anodized film on the inner peripheral surface of the substrate Thus, an electrophotographic photosensitive member provided with a ground plate having a protrusion having a shape capable of stably and reliably conducting with a conductive substrate can be provided.

  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 perspective view of the electrophotographic photosensitive member of the present invention prior to press-fitting of a flange, FIG. 3 is an enlarged partial perspective view showing a method of forming a pointed tip of a protruding portion of a ground plate according to the present invention, and FIG. FIG. 5A is a top view, FIG. 5B is a cross-sectional view passing through the center of the ground plate, and FIG. 5 is a perspective view of a different resin flange with a ground plate according to the present invention. is there.

  The electrophotographic photosensitive member according to the present invention is subjected to sealing treatment by forming an anodic oxide film (not shown) on the surface of a cylindrical substrate made of an aluminum-based metal, as shown in a perspective view before press-fitting of a flange in FIG. After that, a photosensitive layer (not shown) is formed on the outer peripheral surface of the substrate to form the photosensitive drum 1, and the electrophotographic apparatus side is provided at one of the opening ends on both sides of the photosensitive drum 1 having the inner portion 112 on the inner periphery. A resin flange 2 having a gear (gear) 21 for transmitting the rotational driving force to the photosensitive drum 1 is press-fitted and firmly joined, and a gearless resin flange (not shown) is connected to one of the other. Press fit. If the coupling between the resin flange 2 and the photosensitive drum 1 is weak, it will cause a serious accident such as the resin flange 2 being detached from the photosensitive drum 1 during operation of the apparatus. Requires a strong bond. Further, a ground plate 3 is fixed to the resin flange 2 for conducting conductive connection between the cylindrical base and the central shaft.

  In general, the photosensitive drum 1 includes a negatively charged function-separated stacked photosensitive drum, a positively charged single-layered photosensitive drum, and the like. Here, the negatively charged function-separated stacked photosensitive drum which is a preferred embodiment of the present invention is taken as an example. This will be specifically described. In a negatively charged function-separated laminated type photosensitive drum, a photosensitive layer is usually laminated on an undercoat layer formed on a conductive substrate. In the present invention, an aluminum anodic oxide film is formed as the undercoat layer and sealed. The photosensitive layer is a function separation type in which a charge transport layer is laminated on a charge generation layer.

  The conductive substrate is a cylindrical aluminum-based metal substrate that serves as an electrode for the photosensitive drum and is also a support for the other layers. The aluminum material is preferably an aluminum alloy such as JIS standard 6000 series. On the surface of the cylindrical substrate made of an aluminum-based metal, an anodic oxide film subjected to the sealing treatment as described above is formed as an undercoat layer.

  A charge generation layer and a charge transport layer are applied and formed on the outer peripheral surface of the cylindrical substrate on which the anodized film is formed. The charge generation layer is formed by applying a material in which an organic charge generation material is dispersed in a resin binder, and receives light to generate electron-hole pairs. The electron-hole pairs generated here move to the appropriate photosensitive layer interface according to their polarities under an electric field applied to the photosensitive layer. The mobility of electrons and holes from the charge generation layer to the other layer is less dependent on the electric field, and it is desirable that the injection into the other layer is good even at a low electric field. As the organic charge generation material used for such a charge generation layer, various metals, metal-free phthalocyanine compounds, polycyclic quinone compounds, and derivatives thereof can be used.

  Binder resins for the charge generation layer include polycarbonate, polyamide, polyurethane, epoxy, polyvinyl butyral, polyvinyl acetal, phenoxy resin, silicone resin, acrylic resin, vinyl chloride resin, and chloride. Vinylidene resins, vinyl acetate resins, formal resins, cellulose resins, or copolymers thereof, and resins such as halides and cyanoethyl compounds can be used. The composition of the phthalocyanine compound and the resin binder in the charge generation layer is 1 to 200 parts by weight, preferably 5 to 50 parts by weight, based on 10 parts by weight of the resin binder. The thickness of the charge generation layer is 0.1 to 5 μm, preferably 1 μm or less.

  The charge transport layer is a coating film made of a material in which an organic charge transport material is dissolved in a resin binder. The charge transport layer retains the charge of the photoconductor as an insulating layer in the dark, and the charge injected from the charge generation layer when receiving light. Has the function of transporting. As the charge transport material in the charge transport layer, various hydrazones, styryl, diamine, butadiene, indole compounds and mixtures thereof can be used.

  Polycarbonate resins, polystyrene resins, polyphenylene ether resins, acrylic resins, polyester resins and the like have been studied as known resins as binders for the charge transport layer, but in terms of film strength and printing durability, the polycarbonate resin is used. -Bonate resin is widely used in practice as the most excellent material system at present. The thickness of the charge transport layer is preferably in the range of 10 to 50 μm.

  As a resin material for the resin flange according to the present invention, an insulating resin such as a polycarbonate (PC) resin or a polyoxymethylene (POM) resin is used and cast using a mold from the viewpoint of price, mechanical strength, dimensional accuracy, and the like. Molded. The shape may be the same as the conventional one as shown in FIG. Furthermore, in order to ensure the conduction function necessary for ground connection, a conductive resin flange may be employed. However, in the present invention, an inexpensive insulating resin, a metal plate (ground plate), etc. Adopt a combination of

  The ground plate 3 may be made of one or more elastic stainless steel or phosphor bronze plates such as SUS304. The ground plate 3 is fixed to the end face of the resin flange 2 on the press-fitting side to the photosensitive drum 1. The protrusions 31 having a pointed tip 311 formed on the outer periphery of the ground plate 3 can be provided at a plurality of locations. An enlarged plan view of this ground plate is shown in FIG. It is preferable that the protrusion 31 is a pointed outer peripheral position with respect to the center. Conduction with a pin-shaped support shaft (not shown—similar to the pin 14 in FIG. 2) passing through the center hole 30 of the ground plate 3 is a tongue-shaped contact formed near the center hole 30 of the ground plate 3. It is obtained by elastic contact by the protrusion 32. The ground plate 3 is attached to the resin flange 2 by pressing a resin protrusion provided on the end face of the resin flange 2 into a fixing hole 33 provided in the ground plate or by heating and melting the resin protrusion and fixing it with a resin. . When viewed from the press-fitting direction to the photosensitive drum, the pointed tip 311 of each projection 31 of the ground plate 3 overlaps with each projection almost at one point. The scratch line formed in the inner peripheral surface is a single line (four lines if there are four protrusions on the entire ground plate). When this pointed tip is viewed from a direction perpendicular to the press-fitting direction, it is separated as indicated by 311a and 311b in FIG. 4B. Therefore, since the two pointed tips are press-fitted so as to be scratched twice on the same line during press-fitting, even if there is a hard anodic oxide film on the inner peripheral surface of the photosensitive drum, it is ensured that the aluminum below the anodic oxide film You can touch. A more stable conductive contact can be obtained than when at least one pointed tip is present.

  The pointed tip 311 of the protrusion 31 is formed as shown in FIGS. 3A, 3B, and 3C as an example. In (a), cuts 312 and 313 are formed in the protrusion 31 formed by punching using a phosphor bronze plate mold, and the portion indicated by the dotted line in (a) is formed as shown in (b). Fold each other using a mold on the opposite side of the plate surface, and then bend again so that the pointed tip protrudes outward from the outer periphery of the ground plate as shown in (c) ((b), (c ) The bent part is indicated by a dotted line). At this time, the upper and lower two pointed tips 311a and 311b overlap each other when viewed from the direction perpendicular to the main surface of the ground plate (the direction in which the resin flange is pressed into the photosensitive drum). Further, the upper and lower two pointed tips 311a and 311b appear to be separated from each other when viewed from a direction parallel to the main surface of the ground plate.

  The ground plate having an example of two pointed tips having a mutual relationship according to the present invention has been described above. However, the protrusions formed on the outer peripheral portion of the conductive elastic body according to the present invention are “two The two or more pointed tips are provided as seen from the press-fitting direction so that the two or more pointed tips are slidably pressed on the same line of the inner peripheral surface of the cylindrical substrate. The tip may be formed by another method as long as it has a shape in which two or more pointed tips are separated from each other in the press-fitting direction when viewed from a direction perpendicular to the press-fitting direction. The example of the protrusion part concerning this invention by such another method is shown in the perspective view of the resin flange shown in FIG. The resin flange 40 uses two ground plates 50 used in the conventional resin flange described with reference to FIG. 2, and is attached to the end face through a spacing resin between the two ground plates. However, it is important that the protrusions 51 of the two ground plates 50 are aligned in the press-fitting direction so that the pointed tips overlap with one point when viewed from the press-fitting direction. The effect of the present invention can be obtained in the resin flange 40 thus produced as well as the resin flange 2 according to the present invention shown in FIG.

Aluminum pipe (JIS-A6063 material) is processed into desired dimensions (outer diameter: 100 mm, inner diameter: 97 mm, total length 350 mm) with a lathe, and a spigot part (10 mm in the axial direction from the end face) The inner tube is machined into an aluminum base tube having a predetermined surface roughness, and this base tube is degreased and washed with an alkaline detergent for 3 minutes, and then thoroughly washed with pure water. After washing with water, electrolytic treatment was performed under the conditions of a free sulfuric acid concentration of 180 g / l, a temperature of 20 ° C., a current density of 0.74 A / dm ² , and an aluminum concentration in the liquid of 3 g / l. Formed. Subsequently, a pure water sealing treatment liquid whose pH was adjusted to 5 to 8 with ammonium acetate was prepared, and each of the aluminum anodized tubes with the anodized film was treated at a temperature of 90 ° C. for 10 minutes. Rinse. The surface of the obtained aluminum base tube sample was scrubbed with a nylon brush for 1 minute using a 2% solution of alkaline detergent (Castrol 450: Castro Co., Ltd.), rinsed with pure water, and at 60 ° C. Dried.

These blank samples were subjected to dip coating using a charge generation layer (CGL) coating solution prepared by dispersing a material having the following composition with a disperser. After coating, the film was dried at 100 ° C. for 30 minutes, and the solvent was removed to form CGL having a film thickness of 0.3 μm.
(Composition of coating solution for charge generation layer)
X-type metal-free phthalocyanine 1 part Vinyl chloride copolymer resin (MR-110 Nippon Zeon Co., Ltd.) 1 part Methylene chloride (solvent) 98 parts

Next, a coating solution for charge transport layer (CTL) having the following composition was dip coated thereon. Then, it dried at 100 degreeC for 30 minutes, the solvent was removed, and the charge transport layer with a film thickness of 25 micrometers was formed.
(Composition of coating solution for charge transport layer)
Hydrazone compound (CTC191: Annan Fragrance Co., Ltd.) 9 parts butadiene compound (T405: Annan Fragrance Co., Ltd.) 1 part Polycarbonate resin (trade name: Panlite TS2050, manufactured by Teijin Chemicals Ltd.) 10 parts Methylene chloride (solvent) 80 parts Antioxidant: BHT Compound 0.5 part A multilayer organic photosensitive drum was produced as described above.

  As shown in the perspective view of FIG. 1A, the resin flange 2 has a gear on the outer periphery, and is provided on the inner side of the large diameter portion 21 that becomes a butting portion when pressed into the photosensitive drum and the opening end portion of the photosensitive drum. It consists of a small-diameter portion 22 that is press-fitted into the inlay portion. This flange is formed by casting the above-described POM resin into a mold. The outer diameter of the small-diameter portion is 98.1 mm which is slightly slightly larger than the inner diameter 98 mm of the inlay portion of the photosensitive drum, so that the small-diameter portion can be firmly fitted when pressed into the photosensitive drum. An adhesive may be used in order to ensure a more stable and reliable connection between the photosensitive drum and the resin flange by this fitting. When an adhesive is used, a concave portion (not shown) that serves as a relief or accumulation place for the adhesive can be formed in the small diameter portion of the resin flange as necessary. Further, a ground plate 3 according to the feature of the present invention is attached to the press-fitting side end face of the resin flange 2 by using a fixing hole 33 provided in the ground plate. The ground plate is provided on the outer periphery of the main body portion, which is smaller than the outer diameter of the small-diameter portion of the resin flange, the protruding portion protruding outward from the outer diameter of the small-diameter portion of the flange, and the support shaft on the device side ( A pin-shaped contact plate 32 is provided in a central hole through which the pin) penetrates and is in conductive contact with the pin.

  The resin flange was press-fitted into the laminated organic photosensitive drum to produce an electrophotographic photosensitive member according to the present invention. Ten such electrophotographic photosensitive members of the present invention and ten conventional electrophotographic photosensitive members shown in FIG. 2 were prepared, mounted on an electrophotographic apparatus, and image evaluation was performed for comparison. In the electrophotographic photoreceptor of the present invention, no image defect occurred and all were good. However, in the case of the conventional electrophotographic photoreceptor, image defect occurred in 2 out of 10 images. When the resin flange was removed from the photosensitive drum and the inner peripheral surface of the fitting portion was examined with respect to the electrophotographic photosensitive member having a defective image, it was found that the conductive connection was defective.

The perspective view before flange press-fitting of the electrophotographic photosensitive member of the present invention, Schematic configuration diagram of a conventional electrophotographic photoreceptor, The expanded partial perspective view which shows the formation method of the pointed tip of the projection part of the ground plate concerning the present invention, (A) of the embodiment of the ground plate used in the electrophotographic photosensitive member of the present invention is a top view, (b) is a sectional view through the center of the ground plate, It is a perspective view of a different resin flange with a ground plate concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 11 Photosensitive drum 111 Opening end part 112 Inner part 132 Center part protrusion 14 Support shaft, pins 2, 12, 40 Resin flange 21 Gear (large diameter part)
22 Small-diameter portions 3, 13, 50 of resin flange Ground plates 31, 51, 131 Protruding portions 311, 311a, 311b Pointed tips 312, 313 Notch 30 Center hole 32 Contact protrusion (contact plate)
33 fixing hole

Claims (6)

  A conductive cylindrical base whose outer surface is coated with a photosensitive layer via an anodized film, a resin flange press-fitted into the inner peripheral surface of the opening end of the cylindrical base, and a conductive property penetrating the resin flange A conductive elastic body fixed to the resin flange to electrically connect the central shaft body and the cylindrical base body, and slidably contacting the inner peripheral surface of the cylindrical base body by a protrusion formed on the outer peripheral portion; In the electrophotographic photosensitive member, the protrusion formed on the outer peripheral portion of the conductive elastic body has two or more pointed tips, and each of the two or more pointed tips is an inner peripheral surface of the cylindrical substrate. The two or more pointed tips are overlapped at one point when viewed from the press-fit direction, and the two or more pointed tips are press-fitted when viewed from the direction perpendicular to the press-in direction. Characterized by having shapes that are spaced apart from each other in the direction. Electrophotographic photosensitive member to be.   2. The electrophotographic photosensitive member according to claim 1, wherein the conductive elastic body is formed of a single metal elastic body.   2. The electrophotographic photosensitive member according to claim 1, wherein the conductive elastic body is formed of a plurality of metal elastic bodies.   The electrophotographic photosensitive member according to claim 1, wherein a plurality of protrusions are formed on the outer periphery of the conductive elastic body.   5. The electrophotographic photosensitive member according to claim 4, wherein the conductive elastic body is a plate material mainly composed of phosphor bronze or elastic stainless steel.   6. The electrophotographic photosensitive member according to claim 5, wherein the resin flange material is a polyacetal resin or a polycarbonate resin.

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