JP4821795B2 - Method for manufacturing substrate for electrophotographic photosensitive member, electrophotographic photosensitive member, and image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus such as a copying machine or a laser beam printer, an electrophotographic photosensitive member mounted on the image forming apparatus, and a base for an electrophotographic photosensitive member used for the electrophotographic photosensitive member.

  In recent years, the demand for higher accuracy of the electrophotographic photoreceptor substrate (photoreceptor drum) has been further increased by the promotion of higher resolution, colorization, and miniaturization of the electrophotographic apparatus. If the photoconductor drum is bent (the photoconductor drum itself is curved) or swelled (the photoconductor drum itself becomes a drum shape or a drum shape in the axial direction), it is caused by these. Due to the shake, an image shift from a position where an image should originally be formed during electrostatic latent image formation and transfer occurs.

  More specifically, in the case of performing laser operation using a polygon mirror such as a laser beam printer, when forming an electrostatic latent image, the laser beam is incident obliquely closer to the end of the photosensitive drum. When the photosensitive drum is bent or swollen, a deviation in the main operation direction such as the arrival position of the laser beam deviates in the drum axis direction occurs. In addition, when the photosensitive drum is bent or swollen, the moving speed of the photosensitive drum surface relative to the exposure system is small at a portion having a small rotational radius due to a difference in the distance from the rotational center of the photosensitive member to the surface of the photosensitive drum, that is, the rotational radius. The electrostatic latent image becomes clogged and the moving speed of the surface of the photosensitive drum with respect to the exposure system is increased at a portion having a large rotation radius, and a deviation in the sub-scanning direction in which the electrostatic latent image extends is generated.

  As a result, the printed image is distorted. In particular, in the case of a color copying machine or printer called a tandem type that uses a plurality of photosensitive drums arranged in parallel, it becomes manifest as a positional shift and a color shift. In addition, in the case of using a light emitting diode as an exposure apparatus, since the focal length is short, image blurring due to shaking is likely to occur, which is an important problem. For these reasons, high accuracy of the photosensitive drum is required, and in particular, a high-precision base without bending or swelling is required for the base.

  Under such circumstances, generally, an aluminum hollow cylindrical body is extruded as a base for an electrophotographic photosensitive member (hereinafter referred to as “base” as appropriate), and the outer periphery is cut through a drawing process, or the outer periphery In many cases, a base that is blasted after cutting is used, and in order to increase the precision, a technique of processing with high precision using mainly an ultra-precision lathe has been taken. However, in such a case, it has been impossible to obtain a highly accurate base body with less variation after cutting due to runout accuracy of the drawn tube and release of stress of the material after cutting. Further, such a phenomenon is the same even if a high-precision drawn tube in machine dimensions is cut, and has been a big problem.

Further, Patent Document 1 shows that a photoconductor with good dimensional accuracy can be obtained by setting the deflection value of an arbitrary portion of the aluminum tube to 0.2 mm or less. However, in the invention (Japanese Patent Application Laid-Open No. 11-174704), the base body may be deformed after cutting due to the residual stress of the drawn tube, and it is not always possible to obtain a stable base body with good accuracy. was there.
JP 11-174704 A

  In order to solve the above problems, the present inventor has examined the possibility of the cause due to the internal stress of the drawn tube, and as a result, the uneven thickness of the extruded tube is set to a predetermined value or less, more preferably the drawn tube end. The residual stress inside the drawn tube, which affects the accuracy after cutting, can be reduced by making the runout accuracy at the center and the center below the specified value, and suppressing variations in the inside diameter of the drawn tube. The inventors have found that a highly accurate substrate can be obtained, and have reached the present invention. That is, the present invention provides a method for producing a substrate for an electrophotographic photosensitive member in which a photosensitive layer is formed on the surface to produce an electrophotographic photosensitive member, and the metal material for the substrate is subjected to an extrusion process and the uneven thickness is 0.2 mm or less. The present invention resides in a method for manufacturing a substrate for an electrophotographic photosensitive member, wherein the substrate is manufactured using an extruded tube.

  According to the present invention, it is possible to reduce the residual stress inside the drawn tube and to reduce the processing variation due to the setting of the processing machine at the time of cutting, so that a highly accurate electrophotographic photoreceptor substrate is obtained. be able to. In addition, it is possible to obtain a stable and highly accurate substrate without deformation after cutting. The photoreceptor using the substrate is less susceptible to the influence of the shaking of the substrate during image formation, so that a good image can be obtained.

  Hereinafter, the present invention will be described in detail. The material for the electrophotographic photoreceptor substrate of the present invention is not limited as long as it is a metal material that can be used for the electrophotographic photoreceptor substrate, but an aluminum material is preferably used. The aluminum material in the present invention refers to aluminum or an aluminum alloy. The aluminum material preferably has a Vickers hardness of 40 Hv or more from the viewpoint that it may escape from the cutting tool due to cutting resistance during processing and the accuracy may deteriorate.

  The metal material is usually formed into a cylinder having a predetermined thickness, length, and outer diameter after being processed into a cylindrical shape by an extrusion process such as a porthole method or a mandrel method. Processing is performed to obtain an electrophotographic photosensitive member substrate. Here, the cylindrical metal material after the extrusion processing is referred to as an “extruded tube”, and the one cut into a predetermined length after the drawing processing is referred to as a “drawn tube”.

  In the present invention, either the porthole method or the mandrel method may be used for the extrusion processing. However, the use of the porthole method is advantageous in that the extruded tube can be easily made uneven in thickness and the yield is high. As a method for the extrusion process, a hot extrusion method is most generally employed. Here, the uneven thickness is a deviation in the thickness when the thickness of the extruded tube is measured by dividing it into six equal parts or more in the circumferential direction. The uneven thickness of the extruded tube is preferably 0.2 mm or less, preferably 0.15 mm or less, and most preferably 0.1 mm or less in order to obtain a highly accurate substrate.

  As a method of the drawing process, it is preferable to perform cold drawing, and the number of times of drawing is 1, and it is preferable to cut the sheet as it is to a predetermined length without performing the straightening after drawing. The outer peripheral reference runout of the drawn tube obtained here is 0.1 mm or less, more preferably 0.07 mm or less, most preferably 0.04 mm or less at the center, and 0.03 mm or less, more preferably at the tube end. 0.02 mm or less, and most preferably 0.01 mm or less. Here, the outer peripheral reference runout at the tube end is the outer reference rollout value around 10 mm from the drawn tube end when the reference is about 10 mm from the drawn tube end. This is the outer peripheral reference roller runout value near the center of the drawing tube when the reference is about 10 mm from the end of the drawing tube. By achieving the above-described uneven thickness and the outer peripheral reference runout value, it is possible to stably obtain a highly accurate base body whose accuracy after the cutting process is less than 20 μm in the center runout amount.

  Further, the inner diameter of the drawn tube is stratified by a width of 20 μm, preferably stratified by 10 μm, most preferably stratified by a width of 5 μm, that is, the inner diameter variation of the drawn tube is ± 20 μm, preferably ± By setting the thickness to 10 μm, most preferably ± 5 μm, a substrate with little variation after the cutting process can be obtained. When cutting, it is necessary to use an ultra-precision lathe and pay close attention to the centering of the tool. The cutting process conditions are not particularly limited, but as general conditions, the machining is performed at a spindle speed of 5,000 and a feed speed of about 0.4 mm / rev.

  In particular, in order to obtain a highly accurate substrate, it is important to perform processing while suppressing rotational runout of the inner diameter receiving chuck jigs on both sides. That is, it is preferable to process the inner diameter receiving chuck jig with the deflection amount with respect to the lathe axis being 10 μm or less, preferably 5 μm or less. Moreover, it is preferable to use the inner diameter receiving chuck jig having an interference of 0 to 50 μm with respect to the median value of the stratified width of the drawn pipe inner diameter to be processed. Further, such a method of the present invention can obtain a more preferable effect by being used for a substrate having an outer diameter of less than φ40 mm.

  The electrophotographic photoreceptor substrate produced as described above may be directly formed with a photosensitive layer on the substrate. However, in order to prevent density unevenness, a photosensitive layer is formed after forming a blocking layer. Is preferred. Here, the blocking layer refers to an anodized film, an undercoat layer, and the like.

The anodized film is formed by subjecting the substrate surface to an anodizing treatment. Prior to the anodizing treatment, it is preferable to perform a degreasing treatment by various degreasing cleaning methods such as acid, alkali, organic solvent, surfactant, emulsion, electrolysis and the like. An anodized film is formed by an anodizing treatment in an ordinary method, for example, an acidic bath such as chromic acid, sulfuric acid, oxalic acid, boric acid, sulfamic acid, etc. Give good results. In the case of anodizing treatment in sulfuric acid, the sulfuric acid concentration is 100 to 300 g / l, the dissolved aluminum concentration is 2 to 15 g / l, the liquid temperature is 0 to 30 ° C., the electrolysis voltage is 10 to 20 V, and the current density is 0.5. It is preferably set within the range of ˜2 A / dm ² , but is not limited thereto. The thickness of the anodic oxide film thus formed is usually 20 μm or less, preferably 10 μm or less, more preferably 7 μm or less.

  The anodized substrate can be sealed or dyed. The sealing treatment is a step of sealing by growing hydrated aluminum oxide or the like in the porous layer. The sealing treatment method may be a normal method, but is preferably performed by dipping in a liquid containing nickel ions (for example, a liquid containing nickel acetate or a liquid containing nickel fluoride). In the case of dyeing, the base is immersed in an organic or inorganic compound salt solution to adsorb those salts. Specifically, it is carried out under conditions such as azo-based water-soluble organic dyes 1 to 10 g / l, liquid temperature 20 to 60 ° C., pH 3 to 9, and immersion time 1 to 20 minutes.

  As the undercoat layer, organic layers such as polyvinyl alcohol, casein, polyvinyl pyrrolidone, polyacrylic acid, celluloses, gelatin, starch, polyurethane, polyimide, and polyamide can be used. Of these, a polyamide resin having excellent adhesion to the substrate and low solubility in the solvent used in the charge generation layer coating solution is preferable. In the undercoat layer, it is effective to contain fine metal oxide particles such as alumina and titania and organic or inorganic pigments. The thickness of the undercoat layer is usually 0.1 to 10 μm, preferably 0.2 to 5 μm. In the present invention, an undercoat layer can be formed on the anodic oxide film.

  A photosensitive layer is formed on the substrate. As the photosensitive layer, a layer in which a charge generation layer containing a charge generation material and a charge transport layer are laminated in this order, a layer in which layers are reversed, or a so-called single layer type in which charge generation material particles are dispersed in a charge transport medium are used. However, a laminated photosensitive layer having a charge generation layer and a charge transport layer is preferred. When the photosensitive layer has a single layer structure, a known material in which a photosensitive material is dispersed in a binder material is used. Examples thereof include a dye-sensitized ZnO photosensitive layer, a CdS photosensitive layer, and a photosensitive layer in which a charge generation material is dispersed in a charge transport material.

  The charge generation layer includes a charge generation material and a binder resin. The charge generation material is not particularly limited as long as it is a material used for an electrophotographic photosensitive member. Specifically, selenium and its alloys, arsenic-selenium, cadmium sulfide, zinc oxide, and other inorganic photoconductors. Organic pigments such as phthalocyanine, azo, quinacridone, polycyclic quinone, perylene, indigo, and benzimidazole can be used. In particular, metals such as copper, indium chloride, potassium chloride, tin, oxytitanium, zinc, vanadium, or phthalocyanine pigments such as phthalocyanines coordinated with oxides and chlorides thereof, metal-free phthalocyanines, or monoazo, bisazo, Azo pigments such as trisazo and polyazos are preferred. Of these, phthalocyanine pigments are particularly preferred, and oxytitanium phthalocyanine having a specific crystal system is particularly preferred. This is because oxytitanium phthalocyanine is more susceptible to crystal conversion by heat than ordinary pigments.

  Examples of such oxytitanium phthalocyanine include those showing a maximum diffraction peak at a Bragg angle (2θ ± 0.2 °) of 27.3 ° in X-ray diffraction by CuKα rays, but are not limited thereto. is not. The crystal form of oxytitanium phthalocyanine is generally called Y type or D type. For example, FIG. 2 of Japanese Patent Application Laid-Open No. 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 (the same publication) Is 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. However, in the measurement by the Bragg-Brentano concentration method usually used when performing X-ray diffraction of a powder crystal, 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.

  The dispersion medium is not particularly limited as long as it is used in the production process of the electrophotographic photosensitive member, and various solvents may be used. For example, ethers such as diethyl ether, dimethoxyethane, tetrahydrofuran and 1,2-dimethoxyethane; ketones such as acetone, methyl ethyl ketone and cyclohexanone; esters such as methyl acetate and ethyl acetate; alcohols such as methanol, ethanol and propanol Aromatic hydrocarbons such as toluene and xylene can be used alone or in admixture of two or more. The amount of the dispersion medium to be used can be any amount as long as the dispersion can be sufficiently dispersed and an effective amount of the charge generation material is contained in the dispersion, and is usually 3 to 20 wt as the concentration of the charge generation material in the dispersion during dispersion. %, More preferably about 4 to 20 wt%.

  The binder resin is not particularly limited as long as it is used for an electrophotographic photoreceptor, and specifically, polyvinyl butyral, polyvinyl acetal, polyester, polycarbonate, polystyrene, polyester carbonate, polysulfone, polyimide, Vinyl polymers such as polymethyl methacrylate and polyvinyl chloride, and copolymers thereof, phenoxy, epoxy, silicone resins, etc., and partially crosslinked cured products thereof can be used singly or in combination. As a method for mixing the binder resin and the charge generation material, for example, a method of dispersing the charge generation material in a dispersion treatment step while the binder resin is powdered or adding a polymer solution thereof, and dispersing the dispersion liquid obtained in the dispersion treatment step as a binder. Any method such as a method of mixing in a polymer solution of a resin 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 generation material and the binder resin is not particularly limited, but generally the charge generation material is used in the range of 5 to 500 parts by weight with respect to 100 parts by weight of the resin. Moreover, a charge transport material can be included as required. Examples of the charge transport material include organic polymer compounds such as polyvinyl carbazole, polyvinyl pyrene, and polyacenaphthylene, fluorenone derivatives, tetracyanoxydimethane, benzoquinone derivatives, naphthoquinone derivatives, anthraquinone derivatives, and diphenoquinone derivatives. , Carbazole, indole, imidazole, oxazole, pyrazole, oxadiazole, pyrazoline, thiadiazole and other heterocyclic compounds, aniline derivatives, hydrazone derivatives, aromatic amine derivatives, stilbene derivatives, or groups comprising these compounds on the main chain or side Examples thereof include an electron donating substance such as a polymer in the chain. The ratio of the charge transport material to the binder resin is such that the charge transport material is 5 to 500 parts by weight with respect to 100 parts by weight of the binder resin.

  Using the dispersion thus prepared, a charge generation layer is formed on the substrate after cutting or a substrate on which an undercoat layer or an anodized film is formed, and a charge transport layer is laminated thereon. A photosensitive layer is formed, or a charge transport layer is formed on the substrate, and a charge generation layer is formed thereon using the dispersion, thereby forming a photosensitive layer, or using the dispersion on the substrate. The photosensitive layer can be formed by any structure of forming a charge generation layer and forming a photosensitive layer. When the charge generating layer is laminated with the charge transport layer to form a photosensitive layer, the range of 0.1 to 10 μm is preferable, and the thickness of the charge transport layer is preferably 10 to 40 μm. When forming the photosensitive layer with a single layer structure, the thickness of the photosensitive layer is preferably in the range of 5 to 40 μm.

  The charge transport layer is mixed with a known polymer having excellent performance as a binder resin on the charge generation layer and dissolved in a suitable solvent together with the charge transport material, and if necessary, an electron withdrawing compound, or It can be produced by applying a coating liquid obtained by adding a plasticizer, a pigment and other additives.

  As the charge transport material in the charge transport layer, the charge transport materials described above can be used. Various known resins can be used as the binder resin used together with the charge transport material. Thermoplastic resins and curable resins such as polycarbonate resin, polyester resin, polyarylate resin, acrylic resin, methacrylate resin, styrene resin, and silicone resin can be used. In particular, polycarbonate resins, polyarylate resins, and polyester resins that cause less wear and scratches are preferable. The polycarbonate resin can use bisphenol A, bisphenol C, bisphenol P, bisphenol Z, or various known components as its bisphenol component. Moreover, the copolymer which consists of these components may be sufficient. The mixing ratio of the charge transport material and the binder resin is, for example, 10 to 200 parts by weight, preferably 30 to 150 parts by weight, based on 100 parts by weight of the binder resin. In the case of a multilayer photoreceptor, the charge transport layer is formed with the above components as the main component.

  Solvents used for the coating solution for the charge transport layer include ethers such as tetrahydrofuran, 1,4-dioxane, 1,2-dimethoxyethane and anisole; ketones such as methyl ethyl ketone, 2,4-pentanedione and cyclohexanone; toluene, Aromatic hydrocarbons such as xylene; esters such as ethyl acetate, methyl formate and dimethyl malonate; ether esters such as 3-methoxybutyl acetate and propylene glycol methyl ether acetate; chlorinated hydrocarbons such as dichloromethane and dichloroethane Can be mentioned. Of course, one or more of these may be selected and used. Preferably, it is selected from tetrahydrofuran, 1,4-dioxane, 2,4-pentanedione, anisole, toluene, dimethyl malonate, 3-methoxybutyl acetate, and propylene glycol methyl ether acetate.

  Further, the photosensitive layer of the electrophotographic photoreceptor of the present invention contains a well-known plasticizer, antioxidant, ultraviolet absorber and leveling agent in order to improve the film formability, flexibility, coatability and mechanical strength. It may be. Furthermore, an overcoat layer may be provided on the photosensitive layer in order to improve mechanical properties and gas resistant properties such as ozone and NOx. Furthermore, it goes without saying that an adhesive layer, an intermediate layer, a transparent insulating layer, and the like may be provided as necessary.

  In the present invention, the coating operation for forming each of the layers follows a conventionally known coating method. For example, a dip coating method, a spray coating method, a spinner coating method, a blade coating method, or the like can be employed.

  Examples of the image forming apparatus used in the present invention include a monochrome printer, a copier, a color printer, a color copier, and a facsimile. In particular, since the photoconductor of the present invention can provide a high-quality image, it is suitable for a high-resolution image forming apparatus. In particular, it can also be used in an image forming apparatus that obtains an image having a resolution of 600 dpi or more. Moreover, in an image forming apparatus using the photoreceptor of the present invention, the effect of the present invention can be usually obtained by using a light source such as a laser beam having a conventionally known wavelength range. Even in the image forming apparatus using a light source having a wavelength range, it is considered that the effect of the present invention is achieved.

The image forming apparatus includes a developing unit (charging device, developing device, fixing device, static eliminator, cleaner), electrophotographic photosensitive member, optical unit (exposure device), hopper, stacker, and conveyance for recording medium (paper). A path, a fixing unit and the like are provided.
The hopper provides a recording medium (paper) to the conveyance path. The stacker is a stack for storing recorded media (printed sheets). The conveyance path conveys a recording medium (paper). The fixing unit fixes an image transferred from the electrophotographic photosensitive member to a recording medium (paper).

  The developing unit performs development by applying a developer to the electrostatic latent image formed on the electrophotographic photosensitive member. The electrophotographic photosensitive member is to transfer an image developed by the developing unit to a recording medium (paper) 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.

  The operation of the image forming apparatus will be described below. A corona charging system in which the surface of the electrophotographic photosensitive member is charged almost uniformly using a charger such as corotron or scorotron, or a conductive object to which a voltage is applied is brought into direct contact with the surface of the photosensitive body, and electrons or ions are emitted from the surface of the conductive object. The electrophotographic photosensitive member is charged by, for example, a contact charging method for imparting to the surface of the photosensitive member. The host computer sends a print command based on information such as images and characters. If printing is ready at the time of a print command from the host computer, a data request is made, and when each data is sent, it is electronically emitted by a laser beam modulated in accordance with each data by the optical unit of the image forming apparatus. Scan over the photographic photoreceptor. 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. Thereafter, a developer such as toner is applied to the electrostatic latent image formed on the electrophotographic photosensitive member by the developing unit to form a visible image on the electrophotographic photosensitive member. Next, the recording medium (paper) is superimposed on the visible image, and a charge opposite to the developer is applied to the recording medium (paper) from the back of the recording medium (paper) with a charger, and the visible image is formed by electrostatic force. Transfer to a recording medium (paper). The transferred visible image is fused to a recording medium (paper) by heat or pressure to form a permanent image.

  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. Image formation is continuously performed by repeating such a process. When full-color printing is performed, the above-described image forming process is performed for each color to obtain a color image.

  In addition, the recording medium (paper) is sent to the conveyance path one by one by the hopper, and the visible image formed on the electrophotographic photosensitive member is sequentially recorded while the recording medium (paper) is conveyed by the belt-shaped conveyance means. The image is transferred to the medium (paper), the image transferred onto the paper is fixed by the fixing unit, and finally the printed recording medium (paper) is stacked and stored by the stacker.

  As for the image forming apparatus, when full color printing is performed, a developer such as toner attached on the electrophotographic photosensitive member is once transferred to one intermediate transfer belt, and each color toner is transferred onto the intermediate transfer belt. In addition, after forming a color visible image, a color image may be formed on a recording medium (paper) using a transfer unit.

Example 1
A 6000 series aluminum alloy was cast, and an extruded tube was obtained by hot extrusion using a 4-port die (porthole method). In order to obtain an extruded tube with an uneven thickness of 0.2 mm or less with an extruded tube, the aluminum billet, die, and container are heated sufficiently before processing, and the metal flow is smooth during extrusion for the shape of the die. Adopted the shape. After extrusion, the extruded tube was cut about 400 mm before and after the extruded tube, and the uneven thickness of the cut portion was measured to confirm that the uneven thickness was 0.2 mm or less. In this example, the uneven thickness was 0.17 mm.

  This extruded tube was further subjected to cold drawing (single drawing) to obtain a drawn tube having an outer diameter of 30.3 mm and an inner diameter of 28.5 mm. The drawn tube was cut with a circular saw or a laser, and finally a drawn tube having an outer diameter of 30.3 mm, an inner diameter of 28.5 mm, and a length of 342 mm was obtained without correction. The drawn tube thus produced was subjected to a runout measuring device (Laser Displacement Meter LS-5040, LS-5500: Keyence Co., Ltd.) based on the outer diameter, and the center deflection was 0.08 mm or less, and the tube end deflection was 0. Screening was performed with a diameter of 02 mm or less, and a layer with an inner diameter of 28.5 mm as a center value and a width of 10 μm was prepared.

  This drawn tube was attached to a precision lathe SPA-5 manufactured by Changun Kogakusho with an inner diameter receiving chuck jig having an outer diameter of φ28.53 mm with an outer diameter runout of 5 μm with respect to the lathe axis. The interference of the inner diameter receiving chuck jig was 20 μm with respect to the center value of the inner diameter layer width of the drawn tube. The drawing tube inner diameter portion was attached to the outer diameter portion of the jig and cut to obtain an electrophotographic photosensitive member substrate. The outer diameter of the substrate was 30 mm, and the Vickers hardness was 53 Hv.

  When the substrate was measured with a shake measuring instrument (Sinx Co., Ltd.), the center deflection was all 20 μm or less, and good results were obtained.

(Example 2)
An electrophotographic photoreceptor substrate was obtained in the same manner as in Example 1 except that the outer diameter of the drawn tube was 20.3 mm and the inner diameter was 18.5 mm. When the substrate was measured with a shake measuring instrument, all of the central shakes were 20 μm or less, and good results were obtained.

(Comparative Example 1)
A substrate for an electrophotographic photosensitive member was obtained in the same manner as in Example 1 except that the thickness deviation of the extruded tube was 0.4 mm. When the substrate was measured with a run-out measuring instrument, the center run-out exceeded 20 μm, and the maximum was 27 μm, and the variation in accuracy after cutting was greater than in the examples.

(Comparative Example 2)
The electrophotographic photoreceptor in the same manner as in Example 1 except that the thickness deviation of the extruded tube was 0.4 mm, the outer peripheral reference deflection at the center of the drawn tube was 0.15 mm, and the tube end deflection was 0.05 mm. A substrate for use was obtained. When the substrate was measured with a run-out measuring instrument, the center run-out exceeded 20 μm, and the maximum was 32 μm. The variation in post-cutting accuracy was greater than in the examples.

(Comparative Example 3)
An electrophotographic photosensitive member substrate was obtained in the same manner as in Example 1 except that the uneven thickness of the extruded tube was 0.4 mm and the outer diameter of the inner diameter receiving chuck jig was φ28.47 mm. When the substrate was measured with a shake measuring instrument, the center runout exceeded 20 μm, which was 33 μm at the maximum, and the variation in accuracy after cutting was greater than in the examples.

(Comparative Example 4)
A substrate for an electrophotographic photosensitive member was obtained in the same manner as in Example 1 except that the thickness deviation of the extruded tube was 0.4 mm and the deflection of the outer diameter with respect to the lathe axis of the inner diameter receiving chuck jig was 20 μm. When the substrate was measured with a run-out measuring instrument, the center run-out exceeded 20 μm, and the maximum was 41 μm. The variation in accuracy after cutting was greater than in the examples.

Claims (6)

In the method for producing a substrate for an electrophotographic photosensitive member in which a photosensitive layer is formed on the surface to produce an electrophotographic photosensitive member,
Extrusion processing of the metal material for the base, and an extruded tube having an uneven thickness of 0.2 mm or less,
The outer peripheral reference runout at the center of the drawn tube obtained by drawing and cutting to a predetermined length is selected at 0.1 mm or less, and the outer peripheral reference runout at the pipe end is selected at 0.03 mm or less,
Next, a method for producing a substrate for an electrophotographic photosensitive member, comprising performing a cutting process using a lathe having an inner diameter receiving chuck jig. Measuring the inner diameter of the drawn pipe , stratifying the measured inner diameter of the drawn pipe by a width of 20 μm, and providing the inner diameter receiving chuck jig having an interference of 0 to 50 μm with respect to the median value of the layered width. The method for producing a substrate for an electrophotographic photoreceptor according to claim 1 , wherein the layered drawn tube is subjected to a cutting process. Measuring the inner diameter of the drawn pipe , stratifying the measured inner diameter of the drawn pipe by a width of 10 μm, and providing the inner diameter receiving chuck jig having an interference of 0 to 50 μm with respect to the median value of the layered width The method for producing a substrate for an electrophotographic photoreceptor according to claim 1 , wherein the layered drawn tube is subjected to a cutting process . 4. The method of manufacturing a substrate for an electrophotographic photosensitive member according to claim 2 , wherein the inner diameter receiving chuck jig is subjected to a cutting process with a deflection with respect to a lathe axis of 10 [mu] m or less. The method for producing a base for an electrophotographic photosensitive member according to any one of claims 1 to 4, wherein an outer diameter of the base for the electrophotographic photosensitive member is less than 40 mm. 6. The method for producing a base for an electrophotographic photoreceptor according to claim 1, wherein the metal material is an aluminum material, and the material hardness is 40 Hv or more in terms of Vickers hardness.