JP3661781B2 - Photosensitive drum flange member, photosensitive drum using the same, and image forming apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flange member for a photosensitive drum used in an electrophotographic apparatus such as a copying machine or a printer, a photosensitive drum using the same, and an image forming apparatus.
[0002]
[Prior art]
The photosensitive drum is generally composed of a drum body and two flange members attached to both ends of the drum body in the longitudinal direction.
The drum body includes a photosensitive layer formed on the outer peripheral surface thereof, and fitting holes formed at both ends in the longitudinal direction.
The flange member has a fitting portion fitted and fixed in the fitting hole, and a large diameter portion larger in diameter than the fitting portion, or a fitting portion fitted and fixed in the fitting hole, And a gear portion having a diameter larger than that of the fitting portion. A bearing hole and a rotating shaft are provided coaxially with the fitting portion in the large diameter portion and the gear portion. Rotational power is input to the gear portion, and the photosensitive drum is configured to rotate integrally with the gear portion around the bearing holes and the rotation shafts of the flange members on both sides.
[0003]
[Problems to be solved by the invention]
By the way, in many cases, each flange member arrange | positioned at the both ends of a drum main body is manufactured as a molded product made from a synthetic resin.
Therefore, when the fitting part of the flange member is fitted into the fitting hole of the drum body, if the end face of the gear part falls down, that is, the surface perpendicular to the axis of the fitting part. If the end face is tilted, the axis is displaced, which causes deterioration of the image.
Further, the flange member is press-fitted into the drum body using a machine. At that time, in the flange member having a gear part, the force at the time of press-fitting also acts on the gear part, causing the gear part to be deformed. Cause deterioration.
In particular, recent high-resolution printers, full-color printers, and the like have strict accuracy requirements for the photosensitive drum, and if the above-described shaft misalignment or gear portion deformation occurs, the image deterioration becomes prominent.
The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a flange member for a photoconductor drum that is advantageous in obtaining a photoconductor drum having no axis deviation.
Another object of the present invention is to provide a photosensitive drum flange member that can be press-fitted into a fitting hole of a drum main body without causing deformation of the gear portion, and that is advantageous in obtaining a photosensitive drum free of axial deviation. It is in.
It is another object of the present invention to provide a photosensitive drum and an image forming apparatus using the photosensitive drum flange member.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is formed at a fitting portion fitted in a fitting hole at an end portion of a drum body having a photosensitive layer formed on an outer peripheral surface, and an axial end portion of the fitting portion. a photosensitive drum flange member having a gear portion having a larger diameter than the fitting portion which is, facing the end of the drum body in a state in which the fitting portion is fitted into the fitting hole the end face of the gear portion, the stepped portion of the fitting portion and an annular projecting endwise successive drum body circumferentially coaxially disposed, stepped portion of the annular facing end of the drum body The front end of the drum is perpendicular to the rotation center axis of the flange member for the photoconductor drum with high accuracy and can be in contact with the end surface of the end of the drum body continuously with the fitting portion in the circumferential direction. such an annular abutment surface is formed, the outside diameter of the stepped portion of the annular outer peripheral diameter is smaller than this of the drum body The features.
Further, the present invention includes a fitting portion to be fitted into the fitting hole of the end of the drum body photosensitive layer formed on the outer circumferential surface, the fitting is formed at an end portion in the axial direction of the fitting portion than engaging portion a flange member for the photosensitive drum with a large diameter portion having a larger diameter, the size of the fitting portion abuts on an end of the drum body in the fitted state into the fitting hole The end surface of the diameter portion is formed by a contact surface orthogonal to the rotation center axis of the photosensitive drum flange member with high accuracy, and the outer diameter of the contact surface of the large diameter portion is the outer periphery of the drum body. It is smaller than the diameter .
In addition, the photosensitive drum and the image forming apparatus of the present invention are characterized by using the flange member for the photosensitive drum.
[0005]
According to the present invention, a photosensitive drum having no axial deviation can be obtained by the contact surface, and a photosensitive drum having a gear portion without deformation can be obtained.
Further, according to the photosensitive drum and the image forming apparatus of the present invention, it is advantageous for obtaining a clear image.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is an explanatory view of the end of the drum body and the flange member, and FIG. 2 is an explanatory view of a state in which the flange member is fitted to the end of the drum body.
The photosensitive drum 12 includes a drum main body 14 and flange members 16 disposed at both ends thereof, and only one flange member is disclosed in FIGS. 1 and 2. The drum body 14 is configured by forming a photosensitive layer 1404 on the outer peripheral surface of a cylindrical body 1402, and fitting holes 1406 are formed at both ends of the cylindrical body 1402, respectively. The cylindrical body 1402 is made of, for example, an aluminum alloy. .
[0007]
The flange member 16 is usually made of synthetic resin and is molded using a mold. The flange member 16 includes a cylindrical fitting portion 20 fitted in the fitting hole 1406, and a gear portion having a diameter larger than that of the fitting portion 20 formed at an end portion in the axial direction of the fitting portion 20. 22 and a stepped portion 24 formed on the end face of the gear portion 22, and the outer diameter of the fitting portion 20 is formed with a size that is press-fitted into the fitting hole 1406 and fitted.
The fitting portion 20, the gear portion 22, and the step portion 24 are formed on the same axis, and a shaft hole 26 is formed on the same axis so as to penetrate the fitting portion 20, the gear portion 22, and the step portion 24. A rotating shaft is inserted through the shaft hole 26 of the flange member 16 at both ends, and the photosensitive drum 12 rotates around the rotating shaft.
Note that the fitting portion 20 and the shaft hole 26 are preferably formed with a coaxiality of 30 μm or less, and more preferably 20 μm or less.
[0008]
The step portion 24 has an annular shape centered on the fitting portion 20, and is provided on the end face of the gear portion 22 facing the end portion of the drum body 14 in a state where the fitting portion 20 is fitted in the fitting hole 1406. Yes.
The step portion 24 is coaxial with the fitting portion 20 and is continuous in the circumferential direction and protrudes toward the end portion of the drum main body 14.
An annular contact that is concentric with the fitting portion 20 in the circumferential direction and that can contact the end surface 1408 of the end of the drum body 14 is provided at the tip of the step portion 24 facing the end of the drum body 14. A surface 2402 is formed.
As apparent from FIGS. 1 and 2, the outer peripheral diameter of the annular step portion 24 is smaller than the outer peripheral diameter of the drum main body 14, and therefore the outer peripheral diameter of the annular contact surface 2402 is smaller than the outer peripheral diameter of the drum main body 14.
The contact surface 2402 is formed to be orthogonal to the rotation center axis of the flange member 16 (or the axis of the fitting portion 20 or the axis of the shaft hole 26) with high accuracy. More specifically, it may be formed at a squareness within a range of 90 ± 0.05 degrees with respect to the rotation center axis of the flange member 16 so as to prevent image deterioration. More preferably, it is formed with a squareness within a range of 03 degrees. In this embodiment, the contact surface 2402 is a flat surface, but the contact surface 2402 may be formed in a corrugated shape, and the shape thereof is arbitrary.
In the present embodiment, the stepped portion 24 is continuously provided on the outer peripheral portion of the fitting portion 20 so that the inner peripheral surface thereof coincides with the outer peripheral surface 2002 of the fitting portion 20, and the stepped portion 242 The inner peripheral part and the outer peripheral surface 2002 of the fitting part 20 are connected. A groove is provided between the outer peripheral surface 2002 of the fitting portion 20 and the inner peripheral portion of the contact surface 2402, and the inner peripheral portion of the contact surface 2402 is provided away from the outer peripheral surface 2002 of the fitting portion 20. It is arbitrary.
[0009]
The thickness T of the drum body 14 is not particularly limited, but the thickness T is preferably 0.7 to 3 mm, more preferably 0.7 to 1.1 mm.
The width W along the radial direction of the abutting surface 2402 is premised to be formed so as to be able to abut on the end surface 1408 of the end portion of the drum body 14, but the end surface 1408 of the end portion of the drum body 14. Is abutted against the contact surface 2402 in a stable state to prevent image deterioration, the width along the radial direction of the portion where the contact surface 2402 contacts the end surface 1408 of the end of the drum body 14 is The drum body 14 is preferably formed with a size of 20% or more of the wall thickness. For example, when the end surface of the end portion of the drum main body 14 is chamfered, when the width along the radial direction of the contact surface 2402 is W and the width of the chamfer is C, W−C ≧ T × 0.2 is preferable, and W−C ≧ T × 0.4 is more preferable.
[0010]
In the present embodiment, as shown in FIG. 2, the flange member 16 is moved in the axial direction by a pressurizing mechanism such as an air cylinder, and the flange member 16 is fitted into the fitting hole 1406 at the end of the drum body 14. The part 20 is assembled by being press-fitted and fitted.
At that time, the end surface 1408 of the end portion of the drum body 14 comes into contact with the annular contact surface 2402 of the stepped portion 24, so that the press-fitting operation is completed, and the contact surface 2402 is in contact with the rotation center axis of the flange member 16. Since they are orthogonal to each other with high accuracy, the end surface 1408 abuts against the abutment surface 2402, so that the photosensitive drum 12 with no axial deviation can be obtained. Further, when the fitting portion 20 is press-fitted, the end surface 1408 of the end portion of the drum body 14 abuts on the annular abutment surface 2402 of the step portion 24 and abuts on the end surface or tooth portion of the gear portion 22. Therefore, problems such as deformation of the gear portion 22 due to the force during press-fitting are prevented.
[0011]
According to the present embodiment, it is possible to obtain a high-precision photoconductor drum 12 with no axial deviation and a photoconductor drum 12 having a gear portion 22 without deformation.
In the above embodiment, the case where the flange member 16 has the gear portion 22 has been described. However, the present invention is naturally applied to the flange member 16 that does not have the gear portion 22, and in that case, the drum The end surface 1408 of the end portion of the main body 14 abuts on the annular abutment surface 2402 of the step portion 24, so that the high-precision photoconductor drum 12 without axis deviation can be obtained.
[0012]
The photosensitive drum 12 used in the present invention comprises a photosensitive layer 1404 on a conductive support (tubular body 1402). The photosensitive layer 1404 includes a so-called multilayer type in which a charge generation layer and a charge transport layer are separately formed, and a single layer type composed of a single layer. The body is preferred. In particular, in a full-color electrophotographic photosensitive member that requires high sensitivity, a laminated electrophotographic photosensitive member is preferably used. Hereinafter, the photosensitive drum 12 will be described by taking a laminated type as an example.
Examples of the charge generating agent contained in the charge generating layer include selenium and its alloys, arsenic-selenium, cadmium sulfide, zinc oxide, other inorganic photoconductors, phthalocyanines, azo series, quinacridone series, polycyclic quinone series, perylene. Organic pigments such as those based on Indigo, squarylium dyes, azurenium dyes, thiapyrylium dyes, and benzimidazoles can be used. In particular, metals such as copper, indium chloride, potassium chloride, tin, oxytitanium, zinc, vanadium, or phthalocyanines coordinated with oxides or chlorides, metal-free phthalocyanines, or monoazo, bisazo, trisazo, polyazos Azo pigments such as are preferred. Of these, azo pigments or phthalocyanines are more preferable, and so-called Y-type oxytitanium phthalocyanine is particularly preferable because high sensitivity can be obtained. The charge generating agent may be used alone or in combination of two or more. For example, a mixture of so-called Y-type oxytitanium phthalocyanine and so-called β-type oxytitanium phthalocyanine or α-type oxytitanium phthalocyanine may be used as the charge generator.
[0013]
The so-called Y-type oxytitanium phthalocyanine has a maximum diffraction peak at a Bragg angle (2θ ± 0.2) of 27.3 ° in X-ray diffraction by CuKα rays. This crystalline oxytitanium phthalocyanine is generally referred to as Y-type or D-type. For example, FIG. 2 of JP-A-62-67094 (referred to as type II in the same publication), Fig. 1 of JP-A-2-8256, Fig. 1 of JP-A-64-82045, Journal of Electrophotographic Society Vol. 92 (issued in 1990), No. 3, pages 250-258 (in the same publication) (Referred to as Y-type). This crystalline oxytitanium phthalocyanine is characterized by having a maximum diffraction peak at 27.3 °, but normally has peaks at 7.4 °, 9.7 °, and 24.2 °.
The intensity of the diffraction peak may vary depending on the crystallinity, the orientation of the sample, and the measurement method, but in the measurement by the Bragg-Brendano concentration method usually used when performing X-ray diffraction of the powder crystal, The Y-type oxytitanium phthalocyanine has a maximum diffraction peak at 27.3 °. In addition, when measured by a thin film optical system (generally called thin film method or parallel method), 27.3 ° may not be the maximum diffraction peak depending on the state of the sample. This is probably because it is oriented in the direction.
[0014]
Various solvents may be used as a dispersion medium for the charge generating agent. For example, ethers such as diethyl ether, dimethoxyethane, tetrahydrofuran and 1,2-dimethoxyethane; ketones such as acetone and methyl ethyl ketone; esters such as methyl acetate and ethyl acetate; alcohols such as methanol, ethanol and propanol alone Alternatively, two or more kinds can be mixed and used.
The amount of the dispersion medium to be used may be any amount as long as the dispersion can be sufficiently performed and an effective amount of the charge generator is contained in the dispersion, and usually 3 to 20 wt as the concentration of the charge generator in the dispersion at the time of dispersion. %, More preferably about 4 to 20 wt%.
As the binder resin used for the charge generation layer, polyvinyl polymers such as polyvinyl butyral, polyvinyl acetal, polyester, polycarbonate, polystyrene, polyester carbonate, polysulfone, polyimide, polymethyl methacrylate, funol resin, butyral resin, polyvinyl chloride, and the like The copolymer, phenoxy, epoxy, silicone resin, etc., and these partially crosslinked cured products can be used alone or in combination of two or more.
[0015]
As a method for mixing the binder resin and the charge generating particles, for example, a method of dispersing the charge generating particles as a powder or a polymer solution at the same time while dispersing the charge generating particles, or dispersing the dispersion of the binder resin. Any method such as a method of mixing in a polymer solution, or a method of mixing a polymer solution in a dispersion, may be used.
Next, the dispersion obtained here may be diluted with various solvents in order to obtain liquid properties suitable for coating. As such a solvent, the solvent illustrated as the said dispersion medium can be used, for example. The ratio between the charge generating agent and the binder resin is not particularly limited, but generally the charge generating agent is used in the range of 5 to 500 parts by weight with respect to 100 parts by weight of the resin.
[0016]
Examples of the charge transfer agent contained in the charge transfer layer include 2,4,7-trinitrofluorenone, tetracyanoxydimethane and other electron withdrawing substances, selbazole, indole, imidazole, oxazole, pyrazole, oxadiazole. , Electron-donating substances such as heterocyclic compounds such as pyrazoline and thiadiazole, aniline derivatives, hydrazone compounds, aromatic amine derivatives, stilbene derivatives, and polymers having groups of these compounds in the main chain or side chain. . For the charge transfer layer, the same binder resin or the like as the charge generation layer can be used. In particular, it is preferable to use a binder resin having high compatibility with the charge transfer layer. The dispersion for the charge transfer layer is prepared so that the ratio of the charge transfer agent to the binder resin ranges from 5 to 500 parts by weight of the charge transfer substance with respect to 100 weight of the binder resin.
[0017]
Using the dispersion prepared as described above, a charge generation layer is formed on a conductive support, and a charge transfer layer is laminated thereon to form a photosensitive layer 1404. In the case where the charge generation layer is laminated with the charge transfer layer to form the photosensitive layer 1404, the range of 0.1 μm to 10 μm is preferable, and the thickness of the charge transfer layer is preferably 10 to 40 μm.
The conductive support of the electrophotographic photosensitive member used in the present invention is not particularly limited, but aluminum or an aluminum alloy is preferably used.
Examples of the material of the aluminum conductive support include pure aluminum such as JIS1050, JIS1070, and JIS1080, AL-Mg alloy, AL-Cu alloy, AL-Si alloy, AL-Mg-Si alloy, and AL. Examples include various aluminum alloys such as a Cu—Si based alloy, more preferably JIS 3003 which is an AL—Mn based alloy, JIS 6063 which is an AL—Si based alloy, and the like. In the present invention, the term “aluminum” generally represents a general term including an aluminum alloy unless it is expressed separately from an aluminum alloy.
[0018]
Although the manufacturing method of these aluminum conductive supports is not particularly limited, an aluminum billet is processed into an extruded tube by a porthole method, a mandrel method, etc., and then a cylinder having a predetermined thickness and outer diameter is obtained. It can be made by drawing, impacting, ironing, or mirroring by cutting. Since drawing oil, cutting oil, rust preventive oil, various dusts in the air, and the like adhere to the surface of the conductive support, the cleaning treatment is usually performed before the photoconductive layer is formed.
A conductive support manufactured by a known method cannot be expected to be a perfect cylindrical shape, and there is a deviation of several μm to several tens of μm, including uneven thickness of the material and bending. It is also conceivable to increase the accuracy of the electrophotographic photosensitive member by reducing this shake. However, it is very expensive and not always practical.
A known barrier layer as commonly used may be provided between the conductive support and the charge generation layer. A surface protective layer may be provided on the outer surface of the photosensitive layer 1404.
[0019]
Examples of barrier layers include inorganic layers such as anodized films, aluminum oxide, and aluminum hydroxide, and organic layers such as polyvinyl alcohol, casein, polyvinyl pyrrolidone, polyacrylic acid, celluloses, gelatin, starch, polyurethane, polyimide, and polyamide. used. The barrier layer is most effectively used in the range of 0.1 μm to 20 μm, preferably 0.1 μm to 10 μm.
The total thickness of the charge generation layer, charge transfer layer, and protective layer (hereinafter referred to as “photosensitive layer 1404” in this column) provided on the conductive support is preferably set to about 10 μm to 50 μm. In particular, when the photosensitive layer 1404 is thick, unevenness of the photosensitive layer 1404 itself is likely to occur, and the present invention is more preferably applied. The thickness of the photosensitive layer 1404 is preferably 20 to 50 μm, more preferably 25 to 50 μm, and particularly preferably 30 to 50 μm.
[0020]
Examples of the image forming apparatus using the photosensitive drum 12 of the present invention include a printer, a copying machine, and a facsimile.
Since the electrophotographic photosensitive member of the present invention is configured using a photosensitive drum having a gear portion that is free from axial displacement and has no deformation, it is particularly suitable for use in full-color printers, copying machines, facsimiles, and the like. Can do.
The image forming apparatus includes a storage device (1), a storage device (2), a storage device (3), a storage device (4), a hopper, a stacker, a conveyance path for conveying a recording medium (paper), and a fixing unit. is there. Each of the storage devices {circle around (1)} to {circle around (4)} is provided with a developing unit (charging device, developing device, fixing device, static eliminator, cleaner), electrophotographic photosensitive member, and optical unit (exposure device). The recording apparatus (1) includes a yellow (hereinafter referred to as “Y”) developing unit, an electrophotographic photosensitive member, and an optical unit. The recording apparatus (2) includes a magenta (hereinafter referred to as “M”) developing unit, an electrophotographic photosensitive member, and an optical unit. The recording apparatus (3) includes a cyan (hereinafter referred to as “C”) developing unit, an electrophotographic photosensitive member, and an optical unit. The recording apparatus (4) includes a black (hereinafter referred to as “K”) developing unit, an electrophotographic photosensitive member, and an optical unit.
[0021]
The hopper provides paper to the conveyance path. The stacker is a stack for storing printed sheets. The conveyance path conveys paper. The fixing unit fixes an image transferred from the electrophotographic photosensitive member to a sheet.
The developing unit applies a developing material (toner corresponding to each recording device of Y, M, C, and K) to the latent image formed on the electrophotographic photosensitive member and performs development. The electrophotographic photosensitive member is to transfer an image developed by the developing unit onto a sheet after creating an electrostatic latent image corresponding to the image to be obtained. The optical unit scans the electrophotographic photosensitive member with a laser beam modulated by each image data (information) to form an electrostatic latent image.
[0022]
The operation of the image forming apparatus will be described below.
The surface of the electrophotographic photosensitive member is charged substantially uniformly using a charger such as corotron or scorotron. The host computer sends a print command based on information such as images and characters. When printing is instructed from the host computer, if the printer is not ready, it responds with the device busy, and if the printer is ready, it makes a data request. When Y data, M data, C data, and K data are sent from the host computer, the recording devices {circle around (1)} to {circle around (4)} of the image forming apparatus are lasers modulated by the optical unit according to the respective color data. Each electrophotographic photosensitive member is scanned with light. Thereby, the electric charge is removed from the portion on the electrophotographic photosensitive member irradiated with the laser beam, and an electrostatic latent image is formed on the electrophotographic photosensitive member.
[0023]
Thereafter, a developing material such as toner is applied to the electrostatic latent image formed on the electrophotographic photosensitive member in each developing unit to form a visible image on the electrophotographic photosensitive member. Next, the sheet is superimposed on the visible image, a charge opposite to that of the developer is applied to the sheet with a charger from the back of the sheet, and the visible image is transferred to the sheet by electrostatic force. The transferred visible image is fused with heat or pressure to form a permanent image. This operation is performed for each color of Y, M, C, and K on one sheet to obtain a color image on the sheet. On the other hand, the latent image charge on the electrophotographic photosensitive member after transfer is neutralized by light. Further, the developer such as residual toner remaining without being transferred is removed by a cleaner. By repeating the above process, image formation is continuously performed.
[0024]
In addition, the sheets are placed one by one in the conveyance path by the hopper, and the developed images of the respective colors posted on the electrophotographic photosensitive member are sequentially transferred onto the sheets while the sheets are conveyed by the belt-shaped conveyance means. Then, the image transferred on the paper is fixed by the fixing unit, and finally the printed paper is stacked and stored by the stacker.
As an image forming apparatus, a developer (each color toner) attached on each electrophotographic photosensitive member is transferred to one intermediate transfer belt at one end, and each color toner is combined on the intermediate transfer belt. Then, an image may be formed on a sheet using a transfer unit.
[0025]
【The invention's effect】
As is clear from the above description, according to the flange member for the photosensitive drum of the present invention, a photosensitive drum having no axial deviation can be obtained.
In addition, according to the flange member for a photosensitive drum of the present invention, a photosensitive drum having a gear portion that is free from axial deviation and has no deformation can be obtained.
Further, according to the photosensitive drum and the image forming apparatus of the present invention, it is advantageous for obtaining a clear image.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an end portion of a drum body and a flange member.
FIG. 2 is an explanatory view showing a state in which a flange member is fitted to an end portion of a drum main body.
[Explanation of symbols]
12 Photosensitive drum 14 Drum body 16 Flange member 20 Fitting portion 22 Gear portion 24 Step portion

Claims (16)

A fitting portion to be fitted into the fitting hole of the end of the drum body with a photosensitive layer formed on the outer circumferential surface, a diameter larger than that of the fitting portion formed at an end portion in the axial direction of the fitting portion A photosensitive drum flange member having a gear portion of
Wherein the end face of the gear portion facing the end portion of the drum body, endwise successive drum body in the circumferential direction on the fitting portion coaxially in a state in which the fitting portion is fitted into the fitting hole Is provided with an annular step protruding to
The distal end of the stepped portion of the annular facing end of the drum body, circumferentially continuous with the fitting portion coaxially with orthogonal with high accuracy with respect to the central axis of rotation of the photosensitive drum flange member An annular contact surface that can contact the end surface of the end of the drum body is formed ,
The outer peripheral diameter of the annular step portion is smaller than the outer peripheral diameter of the drum body,
A photosensitive drum flange member. 2. The flange member for a photosensitive drum according to claim 1, wherein a thickness of the drum body is 0.7 mm to 3 mm.   2. The photosensitive drum flange member according to claim 1, wherein a shaft hole into which the rotating shaft is inserted is formed in the gear portion so as to penetrate the gear portion coaxially therewith.   2. The photosensitive drum flange member according to claim 1, wherein a rotating shaft is formed on the gear portion so as to be coaxial with the gear portion.   The width along the radial direction of the portion where the annular contact surface contacts the end surface of the end of the drum body is formed to be 20% or more of the wall thickness of the drum body. The flange member for a photosensitive drum according to claim 1.   2. The photosensitive drum use according to claim 1, wherein the contact surface is formed with a squareness within a range of 90 ± 0.05 degrees with respect to a rotation center axis of the photosensitive drum flange member. Flange member.   The annular step portion is provided continuously to the outer peripheral portion of the fitting portion so that the inner peripheral surface thereof coincides with the outer peripheral surface of the fitting portion, and the inner peripheral portion of the contact surface and the fitting portion 2. The flange member for a photosensitive drum according to claim 1, wherein the outer peripheral surface is connected. A fitting portion to be fitted into the fitting hole of the end of the drum body with a photosensitive layer formed on the outer circumferential surface, a diameter larger than that of the fitting portion formed at an end portion in the axial direction of the fitting portion A flange member for a photosensitive drum having a large diameter portion of
The end face of the large diameter portion of the fitting portion abuts on an end of the drum body in the fitted state into the fitting hole, orthogonal with high accuracy with respect to the central axis of rotation of the photosensitive drum flange member formed by abutment surfaces which,
The outer diameter of the contact surface of the large diameter portion is smaller than the outer diameter of the drum body,
A photosensitive drum flange member. 9. The photosensitive drum flange member according to claim 8, wherein the drum body has a thickness of 0.7 mm to 3 mm. 9. The flange member for a photosensitive drum according to claim 8 , wherein a shaft hole into which the rotation shaft is inserted is formed through the large diameter portion so as to be coaxial with the large diameter portion. 9. The flange member for an electrophotographic photosensitive member according to claim 8 , wherein a rotating shaft projects from the large diameter portion coaxially with the large diameter portion. 8. The contact surface is the drum width to end along the radial direction of the abutting portion of the body, characterized in that it is formed by thick more than 20% of the size of the drum body The flange member for photoreceptor drums as described. 9. The photosensitive drum use according to claim 8 , wherein the contact surface is formed at a squareness within a range of 90 ± 0.05 degrees with respect to a rotation center axis of the photosensitive drum flange member. Flange member. The photosensitive drum flange member according to claim 1 or claim 8 photoconductive drum flange member, wherein it is a synthetic resin molded article. Photosensitive drum having a photosensitive drum flange member according to any of claims 1-14. An image forming apparatus using the photosensitive drum according to claim 15 .

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