JPH10254157A - Electrophotographic photoreceptor and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electrophotographic photoreceptor constituted so that the coating performance of an electrical conductive layer is excellent by forming the electrical conductive layer after irradiating the surface of a transmissive substrate, which is a cylindrical plastic substrate obtained by resin-molding a polymerizing liquid material, with ultraviolet rays. SOLUTION: The electrophotographic photoreceptor is constituted of the cylindrical plastic substrate 1 molded by centrifugal polymerization, the electrical conductive layer 2 formed on the outside circumferential surface of the substrate 1, an organic photoreceptor layer(OPC) 3 being as the photoconductive photoreceptor layer formed on the outside circumference of the layer 2 and a processing layer 6 formed between the substrate 1 and the layer 2 in order to prevent image exposure light emitted from the outside of a photoreceptor drum and light from the outside of a used image forming device from being transmitted. When the layer 2 is coated, the surface of a plastic member is melted and the adhesion of the layer 2 is deteriorated. Then, the adhesion of the layer 2 is enhanced by forming the layer 6 by the irradiation of the ultraviolet rays or corona discharge.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic photosensitive member used in an electrophotographic image forming apparatus such as a copying machine, a printer, and a facsimile, and a method of manufacturing the same. In particular, the present invention relates to a cylindrical electrophotographic photosensitive member and a method of manufacturing the same.

[0002]

2. Description of the Related Art In an image forming apparatus for forming an image by an electrophotographic method, a rotating drum or a belt-shaped electrophotographic photosensitive member (electrostatic image forming member) is charged, image-exposed, and developed to form an electrostatic image. A toner image is formed on a charge image forming body, and the toner image is transferred to a transfer material and fixed. In order to fulfill its function, the electrostatic image forming body is arranged around a charger, an exposure device, a developing device, a transfer device, a static eliminator, a cleaning device, etc.
It must be moved at a constant speed at a predetermined timing, maintained without changing the pressure contact state.

In order to be used repeatedly, once the role in one cycle of the image forming process is completed, it is necessary to return to the original position in the original state in preparation for the next image forming cycle. In order to smooth this series of movements and efficiently use expensive members such as a photosensitive drum, in a practically used apparatus, a photosensitive layer is formed on the peripheral surface of an almost cylindrical substrate as an electrostatic image forming body. Although the provided photosensitive drum is used, a metal material such as aluminum is often used as a material of the cylindrical substrate. However, there is a limit to cost reduction in forming a cylindrical substrate by machining using a metal material.

[0004] On the other hand, plastic is considered to be a preferable material because of its light weight and low cost, but it is not easy to produce a cylindrical electrostatic image-forming body with high precision and industrially efficiently. The major factor is that a simple and accurate method for producing a cylindrical substrate having a required size and shape with a high degree of roundness and cylindricity of about 10 μm to 50 μm could not be found. For this reason, conventionally, after manufacturing the cylindrical substrate, the precision has to be secured by machining such as cutting and polishing the surface, which leads to a decrease in productivity and an increase in cost. In addition, it has a disadvantage that it is weak to heat and solvents, and in addition to the accuracy of the surface of the substrate, strength and deformation due to aging are also problems.

As will be described later in detail, for an image forming apparatus configured to perform image exposure from inside the electrostatic image forming body, the cylindrical substrate of the electrostatic image forming body is exposed to light from inside. And the base material cannot be made of metal. Therefore, there is a problem that the image forming method in which image exposure is performed from the inside cannot be practically used even if the apparatus configuration is excellent.

As described above, an excellent cylindrical substrate for an image forming apparatus has been desired, but has not been put to practical use.

The cylindrical substrate of the electrophotographic photoreceptor of the present invention is characterized in that a polymerizable liquid material is injected into a cylindrical mold, and polymerization (centrifugal polymerization) is performed by applying rotation and heat. A method for producing a photographic image forming cylindrical substrate has been proposed by the applicant of the present invention in Japanese Patent Application Nos. 7-13983 and 7-98561, and the like. As a result, a high-precision electrophotographic photosensitive member using such a substrate has been manufactured.

[0008]

However, when an electrophotographic photosensitive member is manufactured by applying a conductive layer or an organic photosensitive layer using a cylindrical plastic substrate formed by resin molding according to the above-described method, particularly, it is difficult to form a conductive layer. At the time of application, a problem arises in that the plastic tube is dissolved by the solvent, and the applicability of the conductive layer deteriorates. Further, in the centrifugal polymerization method for producing a cylindrical plastic substrate by resin molding of the electrophotographic photoreceptor by the above method, it is required that the electrophotographic photoreceptor has a uniform thickness, has no distortion or stress, and has a cylindrical shape. It is required that the plastic substrate be polymerized with a uniform thickness and without distortion or stress.

The present invention solves the above-mentioned problems, and provides an electrophotographic photosensitive member having good coating performance of an organic photosensitive layer, in particular, a conductive layer on a cylindrical plastic substrate, a method for producing the same, and a method for producing a photosensitive member having a uniform thickness. It is another object of the present invention to provide a photoconductor for electrophotography without stress and a method for manufacturing the same.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrophotographic photosensitive member in which a conductive layer and an organic photosensitive layer are sequentially coated on a light-transmitting substrate, and a method of manufacturing the same. Is a cylindrical plastic substrate obtained by resin molding of a liquid material, and the surface of the cylindrical plastic substrate is
The invention is achieved by a photoconductor for electrophotography and a method for manufacturing the same, wherein a conductive layer is formed after irradiation with ultraviolet light (first invention).

The object of the present invention is to provide an electrophotographic photoreceptor in which a conductive layer and an organic photosensitive layer are sequentially formed on a translucent substrate and a method of manufacturing the same, wherein the translucent substrate is made of a polymerizable liquid material. This is achieved by an electrophotographic photoconductor and a method for manufacturing the same, wherein a resin-molded cylindrical plastic substrate is formed, and a surface of the cylindrical plastic substrate is subjected to a corona discharge treatment and then a conductive layer is formed. (Second invention).

[0012]

Embodiments of the present invention will be described below. The description of the present application does not limit the technical scope of the claims and the meaning of terms. Also, the following assertive description in the embodiment of the present invention indicates the best mode, and does not limit the meaning of the terms of the present invention or the technical scope.

A method of manufacturing a cylindrical plastic substrate made of plastic for an electrophotographic photosensitive member according to the present invention will be described with reference to FIGS. FIG. 1 is a view showing steps of a method for manufacturing a cylindrical plastic substrate of an electrophotographic photoreceptor, FIG. 2 is a cross-sectional view showing one embodiment of the manufacturing apparatus of FIG. 1, and FIG. FIG. 4 is a view showing an embodiment of the means, FIG. 4 is a view showing a gantry, FIG. 5 is a view showing insertion of the gantry into a steam chamber, and FIG. It is a figure showing one example.

In the manufacturing apparatus shown in FIG. 2, reference numeral 101 denotes a cylindrical portion whose inner surface is polished to form a good and highly accurate cylindrical surface. 1
02 is a left lid, 103 is a right lid, and left and right lids 102 and 10 are shown.
3, the mold 100 is formed by sandwiching the cylindrical portion 101 from the left and right,
In the sandwiched state, the liquid inside the mold 100 does not leak. An injection port 102b injects a polymerizable liquid material from the injection port 102b. 102c is a thermometer of type 10
The temperature inside 1 is measured.

Left and right lids 1 sandwiching the cylindrical portion 101 of the mold 100
Bearings B1 and B2 are fitted into shafts 102a and 103a provided on the bases 02 and 103, respectively. Bearings B1 and B2 are inserted into V grooves 202a of arms 202 provided on both sides of a U-shaped support 201 of the gantry 200. The mold 100 is mounted on the gantry 200 such that B2 is fitted. Mold 100
Are sequentially inserted from the back side of the arm 202 as shown by arrows in FIG.

As shown in FIG. 5, a caster 203 is mounted on the gantry 200. The gantry 200 on which the mold 100 is mounted is opened into the steam chamber 300 as a heating furnace with the front door 303 opened. You.

A plurality of driving motors M as rotating means are mounted on the outer side of the left side plate 301 of the steam chamber 300, and the left side plate 301 to which the driving motor M is mounted by rails or guide grooves (not shown). However, FIG.
The drive motor M and the shaft 10 of the left cover 103 of the mold 100 are moved by the connecting means constituted by the connecting member 401 and the receiving member 402 as shown by the arrow.
3a. As shown in FIG.
The connection between the drive motor M and the shaft 103a is performed by the connection between the two pins 401a and the two connection grooves 402a of the receiving member 402.

By the rotation of the respective drive motors M, the respective dies 100 are rotated at a high speed by receiving the bearings B1 and B2 held in the V-grooves 202a provided in the arm 202 of the gantry 200.

An intake port 302a provided in the right side plate 302
After the steam is sent into the steam chamber 300 to heat and mold the mold 100, the steam is exhausted from an exhaust port 301 a provided in the left side plate 301.

After the molding of the cylindrical plastic substrate 1, cool air is sent into the steam chamber 300 from the intake port 302a to cool the mold 100, and then exhausted from the exhaust port 301a provided in the left side plate 301.

After the rear door 304 is opened from the steam chamber 300, the gantry 200 is carried out of the steam chamber 300, the respective molds 100 are removed, and the left and right lids 102, 1 are removed.
The cylindrical plastic substrate 1 is taken out by moving at least one of the substrates 03. Subsequently, a gantry 20 to which a plurality of molds 100 loaded with an unmolded polymerizable liquid material are attached.
0 is carried into the steam chamber 300 and molding is performed.

The molding is performed by a centrifugal polymerization method described below.

In the manufacturing process shown in FIG. 1, first, a polymerizable liquid material, for example, methyl methacrylate monomer is synthesized, and a catalyst is added to quickly polymerize the monomer to adjust the viscosity to 10 to 400 cp. ,
Pour into cylindrical mold 100.

When the viscosity is 10 cp or less, the liquid material is
In the step of injecting into the liquid, the degree of polymerization in the liquid dripping or liquid is low, and it takes a long time to cure, resulting in poor productivity. On the other hand, when the viscosity is 400 cp or more, the viscosity is too high, so that uneven injection occurs and bubbles are hardly removed.

This cylindrical mold 100 has an inner diameter of 50 mm or more and 200 mm or less and a length of 200 mm or more and 2000 m or more.
m.

If the inner diameter is less than 50 mm, it is difficult to separate the cylindrical plastic substrate 1 from the mold 100.
If it is more than m, deformation resulting from the difference in the coefficient of thermal expansion between the mold 100 and the cylindrical plastic substrate 1 at the time of peeling is large, and particularly the roundness is deteriorated. When the length is 200 mm or less, the size is insufficient for normal image formation.
Further, when the cylindrical plastic substrate 1 is peeled off, deformation occurs and the uniformity is lost in the length direction, and particularly, the straightness is reduced.

The drive motor M is rotated, and each mold 10 is rotated.
By rotating 0 and heating appropriately, uniform polymerization is promoted. After the completion of the polymerization, an annealing treatment for removing the distortion of the entire cylindrical plastic substrate is performed at the same temperature. After annealing for a certain period of time, the inlet 302
After the cool air is sent into the steam chamber 300 to cool the mold 100, the cool air is exhausted from the exhaust port 301 a provided in the left side plate 301, and cools the cylindrical plastic substrate 1 by the cool air.

At this time, cooling by cold air is performed from one side of the mold 100, in this embodiment, toward the left side from the right lid 103 provided with the suction port 302a, and the outer peripheral surface of the cylindrical plastic substrate 1 is separated. Is gradually performed from the right side to the left side, and the internal stress at the time of peeling is uniformly applied from the right side to the left side, and the surface property is uniform without unevenness and wrinkles due to internal stress distortion. The cylindrical plastic substrate 1 is cooled and peeled while maintaining high precision roundness.

After the cylindrical plastic substrate 1 is peeled off, the gantry 200 is unloaded from the steam chamber 300,
The obtained cylindrical plastic substrate 1 is taken out of the mold 100, buffing is performed as a cutting and finishing step, and annealing is performed again if necessary, thereby completing the cylindrical plastic substrate 1 used for the electrophotographic photosensitive member. . An OPC (organic photosensitive layer) described below is applied to the completed cylindrical plastic substrate 1, and an electrophotographic photoconductor (also referred to as an electrostatic image forming body) used in an electrophotographic image forming apparatus described later. The photosensitive drum 10 (shown in FIGS. 8 and 9) is formed. Heating at the time of drying after OPC coating may be replaced with annealing after buffing.

By the manufacturing method of the present invention based on the above, a highly accurate cylindrical plastic having good dimensional accuracy such as roundness and straightness, uniform surface properties, and cylindricality and roundness both within 10 μm to 50 μm. The substrate is obtained, but as shown by the dotted line in FIG. 1, the dimensional accuracy can be further increased by performing end processing by a lathe if necessary, further cutting the outer peripheral surface, and buffing after cutting. Production can be reduced. Annealing is performed again to complete the cylindrical plastic substrate of the electrophotographic photoreceptor, and the completed cylindrical plastic substrate is coated with an OPC (organic photosensitive layer).
A photosensitive drum is formed as an electrostatic image forming body for an image forming apparatus described later. Heating during drying after OPC coating may be replaced with annealing after lathe processing.

When a functional monomer or a cross-linking agent is added as necessary and heat-cured, the heat resistance and the solvent resistance are further improved, and the dimensions due to the influence of the solvent and heat upon application and drying of the OPC are obtained. Accuracy can be reduced.

The cylindrical plastic substrate obtained by such a manufacturing process has no internal distortion, a hardness comparable to aluminum, a light transmittance of 90% or more, and an impact resistance of about 15 times that of glass.

The above-mentioned centrifugal polymerization method does not leave any dice scratches on the surface of the cylindrical plastic substrate as compared with the extrusion method which is a widely used molding method at present, and in particular, the inner surface is a natural one obtained by centrifugal force. Formed on a surface to form an extremely smooth inner surface such as a glass surface. Moreover, the strength is higher than the cylindrical plastic substrate obtained by the extrusion method,
It has excellent mechanical strength and heat deformation temperature without directionality. Furthermore, since there is no uneven light refraction when light is transmitted from a place where the internal stress is small, it is used as a cylindrical plastic substrate for an electrostatic charge image forming body (photoreceptor drum) and an image exposure light source is installed in the inside. Even when the present invention is applied to the image forming apparatus, the image exposure is not distorted and the image performance is not deteriorated.

As the material of the light-transmitting cylindrical plastic substrate molded by centrifugal polymerization, the material obtained by polymerization using a methacrylic acid methyl ester monomer as described above is the most effective in light transmission, strength, precision, surface properties and the like. Although good, other materials such as poly (ethyl methacrylate), poly (butyl methacrylate), poly (ethyl acrylate), poly (butyl acrylate), polystyrene, polyimide, polyester, polyvinyl chloride, and the like, or a copolymer thereof can be used. In the centrifugal polymerization method, since the roundness is determined by the mold used for molding, a highly accurate cylindrical plastic substrate can be obtained. In addition, uneven thickness varies depending on rotation unevenness and viscosity during polymerization and heating conditions during polymerization. Furthermore, polybutylene terephthalate (PBT), polyethylene terephthalate (P
Molded products of engineering plastics such as ET), polyphenylene sulfide (PPS), and nylon are being used as substitutes for metal materials.

In the above centrifugal polymerization method, the molding conditions for the inner diameter of the mold 100 and the thickness of the base tube are such that the inner diameter of the mold 100 for molding the outer diameter of the cylindrical plastic substrate is 50 to 2 mm.
It is preferable to mold using a polymerizable liquid material having a thickness of 1 mm and a thickness of 1 mm to 5 mm.

It is preferable that the inner diameter of the cylindrical plastic substrate formed by the mold 100 is 50 to 200 mm as an electrophotographic substrate in an image forming apparatus to be described later. A plurality of image exposure means arranged inside the electrostatic image forming body using the substrate cannot be accommodated, and a plurality of developing means and charging means provided on the outer periphery of the electrostatic image forming body cannot be arranged. If it exceeds 200 mm, the cylindrical plastic substrate is deformed by the pressing of a plurality of developing means and cleaning devices.

When the thickness of the substrate is less than 1 mm and thin,
The strength as an electrophotographic substrate is insufficient, and deformation and breakage are liable to occur, and polymerization proceeds locally to cause thickness unevenness.
If the thickness exceeds 5 mm, it is difficult to form a uniform tube.
The roundness of the cylindrical plastic substrate is required to be 100 μm or less from the depth of focus of an equal-magnification imaging element described later. However, when the thickness of the cylindrical plastic substrate is large, the thickness unevenness of the cylindrical plastic substrate becomes large ( The variation of the roundness becomes larger) and exceeds 100 μm, so that it does not fall within the depth of focus of the unit-magnification imaging element.

In the above centrifugal polymerization method, the mold 1
The conditions for the polymerizable liquid material to be the material and the outer diameter of the cylindrical plastic base tube formed by the inner diameter of 00 are as follows: the outer diameter of the cylindrical plastic base is 50 to 200 mm;
The liquid viscosity of the polymerizable liquid material is 10 to 300 millipascals.
It is preferable to mold using a second polymerizable liquid material.

It is preferable that the inner diameter of the cylindrical plastic substrate formed by the mold 100 is 50 to 200 mm as an electrophotographic substrate in an image forming apparatus to be described later. A plurality of image exposure means arranged inside the electrostatic image forming body using the substrate cannot be accommodated, and a plurality of developing means and charging means provided on the outer periphery of the electrostatic image forming body cannot be arranged. If it exceeds 200 mm, the cylindrical plastic substrate is deformed by the pressing of a plurality of developing means and cleaning devices.

On the other hand, if the liquid viscosity is lower than 10 millipascal-seconds, the liquid adhering to the upper part of the cylinder of the rotating mold 100 drips or flows downward, and the inner wall is not uniform. If the liquid viscosity is higher than 300 millipascal-seconds, the liquid surface does not change due to non-uniform polymerization of the liquid during rotation, resulting in uneven thickness and uneven thickness.

Further, in the above centrifugal polymerization method, the mold 1
The outer diameter of the cylindrical plastic substrate to be molded with the inner diameter of 00 and the rotation condition of the mold 100 during molding are such that the outer diameter of the cylindrical plastic substrate is 50 to 200 mm, and the outer diameter of the cylindrical plastic substrate is Where φ is the angular velocity of the mold 100 at the inner diameter position of the substrate at the time of molding, and g is the acceleration of gravity, the mold 100 is rotated under the condition of g ≦ (φ × ω ² ) / 2 ≦ 10 g. To form a cylindrical plastic substrate.

It is preferable that the inner diameter of the cylindrical plastic substrate formed by the mold 100 is 50 to 200 mm as an electrophotographic substrate in an image forming apparatus to be described later. A plurality of image exposure means arranged inside the electrostatic image forming body using the substrate cannot be accommodated, and a plurality of developing means and charging means provided on the outer periphery of the electrostatic image forming body cannot be arranged. If it exceeds 200 mm, the cylindrical plastic substrate is deformed by the pressing of a plurality of developing means and cleaning devices.

The liquid must be pressed against the tube wall by the centrifugal force of the rotating mold 100, but r × ω ² (r is the radius of the cylindrical plastic substrate and φ / 2) is less than g. When the rotation speed is low, the liquid does not adhere to the tube wall of the rotating mold 100 and drips or flows from above. r × ω ² is 10
If the rotation speed exceeds g and the rotation speed is too high, the liquid will not be uniform even if a non-uniform portion is formed, and vibration will be caused by high-speed rotation, which is not preferable for uniformity of the liquid.

According to the above-mentioned molding conditions, there is provided a method for producing a substrate for an electrophotographic photoreceptor in which a cylindrical plastic substrate is polymerized with a uniform thickness and without distortion or stress.

It is also possible to mold by combining the above three conditions, and by molding in combination, the polymerization is carried out with a uniform thickness of the cylindrical plastic substrate without distortion or stress. A method for manufacturing a substrate of an electrophotographic photoreceptor is provided.

In the above, since the driving motor M as the rotating means is provided outside the steam chamber 300, the heating of the rotating means for producing the cylindrical base is prevented.
The drive motor M does not have any defect, and the constant high-speed rotation is always transmitted to the mold 100 by the coupling means, so that a highly accurate resin-molded cylindrical plastic substrate is manufactured. Further, a method for manufacturing a substrate for an electrophotographic photosensitive member having high productivity by molding a large amount of cylindrical plastic substrate at one time is provided.

FIG. 7 shows another example of a method of connecting the driving means.

According to FIG. 7, the gantry 200 is fixed inside the steam chamber 300, and the polymerizable liquid material is loaded from the back side of each arm 202 of the gantry 200 in the same manner as described with reference to FIG. Arm 100
2 is attached to the V groove 202a. At this time, the left side plate 30
The receiving member 4 of the mold 100 is
02 so that the V groove 202 of the arm 202 is
a. As described with reference to FIG. 3, the coupling means includes a coupling member 401 and a receiving member 402.

Each connecting member 401 is connected to a pulley PL1.
And is rotatably attached to the left side plate 301. The belt BL is rotated and driven through a main pulley PL rotated by a drive motor M1 as a common rotating means. Each pulley PL1 provided outside the steam chamber 300 is rotated by the belt BL,
The mold 100 is rotated.

The cylindrical plastic substrate of the electrophotographic photosensitive member is manufactured by the same centrifugal polymerization method as described above.

The driving motor M1 as common rotating means and the main pulley PL, belt BL, pulley P as rotating means
Since L1 and the like are provided outside the steam chamber 300, the heating of the rotating means for manufacturing the cylindrical plastic substrate is prevented, and the drive motor M1 does not have a defect. Is type 1
00, and a high-precision resin-molded cylindrical substrate is manufactured. Further, an apparatus for manufacturing a cylindrical plastic substrate of an electrophotographic photosensitive member having high productivity by molding a large amount of cylindrical substrate at one time is provided.

The cylindrical plastic substrate formed by the above-mentioned production method has a smooth surface, and particularly when a polymer of methyl methacrylate is used, has a very good light transmittance and a high strength. It is suitable for an image forming apparatus employing a mechanism in which an exposure device is placed inside a drum and exposure is performed from the inside.

Next, the structure of the electrophotographic photoreceptor of the present invention using the above-mentioned cylindrical plastic substrate will be described with reference to FIGS. FIG. 8 is a cross-sectional view showing one embodiment of the configuration of the electrophotographic photoconductor of the present invention, and FIG. 9 is a perspective view of the electrophotographic photoconductor of FIG.

Photosensitive drum 10 as electrophotographic photosensitive member
Is a transparent plastic cylindrical plastic substrate 1 formed by centrifugal polymerization described in FIG. 1, a conductive layer 2 formed on the outer peripheral surface of the cylindrical plastic substrate 1,
An organic photosensitive layer (OPC) 3 as a photoconductive photoconductor layer formed on the outer periphery of the conductive layer 2; and transmission of image exposure light emitted from the outside of the photoconductor drum and an image forming apparatus to be used. In order to prevent the transmission of light from outside the apparatus, it is constituted by a processing layer 6 provided between the cylindrical plastic substrate 1 and the conductive layer 2.

The material of the above-mentioned cylindrical plastic substrate 1 obtained by polymerization using a methyl methacrylate monomer is the best in light transmission, strength, precision, surface properties, etc., but other materials such as polyethyl methacrylate and polymethacryl Plastic members such as butyl acrylate, polyethyl acrylate, polybutyl acrylate, polystyrene, polyimide, polyester, polyvinyl chloride, and the like, or a copolymer thereof are used. Further, polybutylene terephthalate (PBT), polyethylene terephthalate ( Molded products of engineering plastics such as PET), polyphenylene sulfide (PPS), and nylon are used as substitutes for metal materials. Conventionally, these plastic members and engineering plastic members are coated with a conductive layer 2. Melt surface by solvent, adhesion of the conductive layer 2 is poor, especially, engineering plastic has poor adhesion. For this improvement, the treatment layer 6 is formed by ultraviolet irradiation or corona discharge, and the adhesion of the conductive layer 2 is improved.

The ultraviolet light used in the ultraviolet irradiation method is 184.9.
nm, 253.7 nm, 40-700 W
Low-pressure mercury lamp is used.
It is. The mechanism of surface modification by ultraviolet irradiation is a strong oxidizing action from the generation and decomposition of O ₃ by the two wavelengths of light or the breaking of molecular chains by the strong energy of short wavelength ultraviolet. The short-wavelength light causes the decomposition of O ₂ and the reaction of generation and decomposition of O ₃ to generate active oxygen (O). The active oxygen (O) gives an oxidizing effect to the molecules of the dirt, and is linked to the activation of the surface due to the absorption of ultraviolet rays, so that the organic dirt on the surface is removed. Further, when the molecular chain is cut, oxygen is bonded thereto and a polar group such as a hydroxyl group, a carboxyl group, or a carbonyl group is introduced. Thereby, the wettability of the conductive layer 2 is improved and the adhesion is increased. In the ultraviolet irradiation method, polar groups are generated on the surface of most plastics except for polypropylene (PP), polyethylene, Teflon and the like.

The corona discharge treatment and the flame treatment are also methods for modifying the surface of the plastic in a short time. However, since the flame treatment is heated, the cylindrical plastic substrate 1 is deformed and the circularity is high (30 μm). I can't keep it. In the case of PET film laminated on an iron plate and nylon 66, PPS, and PBT bonded with an epoxy-based adhesive, all of them are 1.5 to 3 in the case where the bonding strength is untreated by corona discharge treatment.
The fracture mode is so large that cohesive failure of the adhesive and material failure occur. In the corona discharge treatment, as in the case of the ultraviolet irradiation method, a polar group is generated on the surface of the cylindrical plastic substrate 1, so that the wettability of the conductive layer 2 is improved and the adhesion is increased.

The conductive layer 2 is made of indium-tin-oxide (ITO), tin oxide, lead oxide, indium oxide, alumina, copper iodide, or conductive fine particles of Au, Ag, Ni, Al, or the like. Is used, and a dip coating method, a spray coating method, or the like is preferably used as a film forming method. The thickness of the transparent conductive layer 2 is preferably 1 to 5 μm.

In order to enhance the translucency of the conductive layer 2, the conductive layer 2
Can be controlled to 600 Å or less in the Rayleigh scattering (scattering by fine particles having a diameter of 1/10 or less of wavelength) region where light scattering due to image exposure hardly occurs. desirable. As the constituent material of the conductive fine particles, it is preferable to use fine particles having a primary particle diameter of 600 angstroms or less and to control the central radius to 100 angstroms or less in addition to the light transmitting property and the dispersion stability of the liquid.

The organic photosensitive layer 3 as a photoconductor photosensitive layer comprises:
A charge generation layer (C) mainly containing a charge generation material (CGM)
GL) 4 and a charge transport layer (CTL) 5 containing a charge transport material (CTM) as a main component. An organic photosensitive layer having a two-layer structure has high durability as an organic photosensitive layer due to its thick CTL and is suitable for the present invention.
The organic photosensitive layer 3 may have a single-layer structure containing a charge generation material (CGM) and a charge transport material (CTM) in one layer. Usually contains a binder resin.

In the photoreceptor drum having the two-layered organic photosensitive layer, the CGM contained in the CGL 4 may be a metal or metal-free phthalocyanine compound, an azo compound such as a bisazo compound, a trisazo compound, a squarium compound, an azurenium compound. , Perylene compounds,
Examples include, but are not limited to, indico compounds, quinacridone compounds, polycyclic quinone compounds, cyanine dyes, xanthene dyes, charge transfer complexes composed of poly-N-vinylcarbazole, trinitrofluorenone, and the like. These may be used as a mixture of two or more as necessary. However, in order to achieve the object of the present invention at the highest level, azo pigments, azulhenium pigments, phthalocyanine pigments, and perylene pigments having sensitivity to light from light sources such as LEDs and LDs are used. (6
00nm to 850nm)
As M, a copper phthalocyanine pigment, a titanyl phthalocyanine (TiOPc) pigment, or the like is preferably used.

Examples of the binder resin used for CGL4 include polystyrene resin, polyethylene resin, polypropylene resin, polyacryl resin, polymethacryl resin, polyvinyl chloride resin, polyvinyl acetate resin, polyvinyl butyral resin, polyepoxy resin, and polyurethane resin. , Polyphenol resins, polyester resins, polyalkyd resins, polycarbonate resins, polysilicone resins, polymelamine resins, and copolymer resins containing two or more of the repeating units of these resins, for example, vinyl chloride-vinyl acetate copolymer resins , A vinyl chloride-vinyl acetate-maleic anhydride copolymer resin, and a high-molecular organic semiconductor such as poly-N-vinyl carbazole, but are not limited thereto. C of the above
Preferable binders when an imidazole perylene compound is used as GM include polyvinyl butyral resins, and preferable binders when TiOPc is used include polysilicone resins and polyvinyl butyral resins, or a mixture of both.
Polyvinyl butyral resin or polycarbonate resin is excellent in sensitivity, potential change when repeatedly used, and the like. These binder resins can be used alone or as a mixture of two or more.

As a solvent or a dispersion medium used for the formation of CGL4, a ketone-based or halogen-based solvent is preferably used, and the sensitivity and the potential change upon repeated use are further improved. These solvents can be used alone or as a mixture of two or more solvents.

The weight ratio of CGM to the binder resin in CGL4 is 100: 1 to 1000, the thickness of CGL4 is 0.01 to 10 μm, and the coating method for forming CGL4 is as follows. There are various coating methods such as coating, wire bar coating, spray coating, dip coating and slide hopper coating.

Next, as the CTM contained in the CTL5, hydrazone compounds, styryl compounds, benzidine compounds, stilbene compounds and the like are used. For example, carbazole derivatives, oxazole derivatives, oxadiazole derivatives, thiazole derivatives, Thiadiazole derivatives, triazole derivatives, imidazole derivatives, imidazolone derivatives, imidazolidine derivatives, bisimidazolidine derivatives, styryl compounds, hydrazone compounds, pyrazoline derivatives, oxazolone derivatives, benzimidazole derivatives, quinazoline derivatives, benzofuran derivatives,
Acridine derivatives, phenazine derivatives, aminostilbene derivatives, triarylamine derivatives, phenylenediamine derivatives, stilbene derivatives, benzidine derivatives, poly-N-vinylcarbazole, poly-1-vinylpyrene, poly-9-vinylanthracene, and the like. It is not limited to. These may be used alone or in combination of two or more.

The binder resin used in the CTL5 can be selected from a wide range of insulating resins as appropriate, and may be, for example, a polycarbonate resin, a polyacrylate resin, a polyester resin, a polystyrene resin, or the like.
Examples thereof include, but are not limited to, styrene-acrylonitrile copolymer resin, polymethacrylate resin, and styrene-methacrylate copolymer resin. Preferred binder resins include insulating resins such as silicon-alkyd resin, phenol-formaldehyde resin, poly-N-vinylcarbazole, and polysilane. These binder resins may be used alone or in combination of two or more. Can be used.

The mixing ratio of the binder resin and CTM is 1:
It is set to 10 to 500, more preferably 1:20 to 150. The thickness of the CTL 5 is set to 1: 100 μm, and more preferably 5 to 50 μm.

As a coating method, a method similar to CGL can be used.

If necessary, an intermediate layer is provided between the organic photosensitive layer 3 and the conductive layer 2. Examples of the intermediate layer include a vinyl chloride-vinyl acetate copolymer, a vinyl chloride-vinyl acetate maleate copolymer, ethyl cellulose, and carboxy. A resin layer having a thickness of 0.01 to 2 [mu] m, such as methyl cellulose, a copolymer type or a modified type alcohol-soluble polyamide resin, or the like.

By using the translucent cylindrical plastic substrate produced by the above-described manufacturing method, the thickness of the cylindrical substrate is uniform, the cylindricity of the cylindrical substrate is excellent, and the circularity of the cylindrical substrate is excellent. There is provided a photosensitive drum without defocusing of image exposure light from inside.

In order to reduce fatigue deterioration upon repeated use or to improve durability, a known antioxidant may be added to each layer of the photosensitive drum.
An ultraviolet absorber, an electron-accepting substance, a surface modifier, a plasticizer and the like, an environment-dependent reducing agent, and the like can be added and used in an appropriate amount as needed.

In order to improve the durability, a non-photosensitive layer such as a protective layer may be provided in addition to the photosensitive layer, if necessary.

The cylindrical plastic substrate can realize more preferable physical properties by using a cross-linking agent, a conductivity-imparting agent, a coloring agent and the like in combination with a polymerizable liquid material for an electrostatic image forming member. For example, the addition of a cross-linking agent improves heat resistance, solvent resistance, and strength, and the conductivity-imparting agent can prevent electrostatic contamination such as dust and replace the conductive layer. These are effective for an electrostatic image forming body which is subjected to external force or heat during use or a solution is coated on a substrate.

As described above, by subjecting the surface of the cylindrical plastic substrate to ultraviolet irradiation treatment or corona discharge treatment, an electrophotographic photosensitive member having good coating performance of the organic photosensitive layer, particularly the conductive layer, on the cylindrical plastic substrate can be obtained. A manufacturing method is provided.

The cylindrical plastic substrate manufactured by using the above-mentioned plastic member or engineering plastic member by the above-mentioned centrifugal polymerization method has a uniform thickness, and is polymerized without distortion or stress. The present invention provides an electrophotographic photosensitive member having a uniform thickness, having no distortion or stress, and a method of manufacturing the same.

As will be described later, the provision of conductivity to the cylindrical plastic substrate of the electrophotographic photosensitive member according to the present invention is as follows.
Conductive treatment may be performed on the surface, or conductive fine powder may be added during polymerization. This substrate provides good images by mounting it on conventional electrophotographic copiers and printers, and particularly, density unevenness that occurs when dimensional accuracy is poor.
An image without color unevenness is obtained.

Also, by appropriately selecting the raw materials as described above, a translucent cylindrical plastic substrate can be obtained, in particular, by including the methacrylic acid ester as a polymerizable liquid material. This is a cylindrical plastic substrate which can be applied to an image forming apparatus for exposing from the inside of the electrostatic image forming body described below to obtain a good image, and a photosensitive layer is formed on the peripheral surface of the cylindrical plastic substrate. The image forming apparatus is provided with a photosensitive drum, and an internal exposure is performed on the photosensitive drum to form an image.
The electrophotographic photoreceptor according to the present invention has excellent characteristics.

Next, an embodiment of an image forming apparatus using the electrophotographic photosensitive member of the present invention will be described with reference to FIGS. FIG. 10 is a cross-sectional configuration view of a color image forming apparatus showing an example of an image forming apparatus to which the electrophotographic photosensitive member of the present invention manufactured using the cylindrical plastic substrate described above is applied, and FIG. FIG. 3 is a side sectional view of a state in which the photosensitive member for use is mounted on the apparatus main body.

The photosensitive drum 10, which is a cylindrical electrophotographic photosensitive member (electrostatic charge image forming member), has a cylindrical plastic base formed of a light-transmitting member made of a light-transmitting acrylic resin provided inside. A transparent conductive layer and an organic photosensitive layer (OPC) are formed on the outer periphery of the substrate, and are rotated in the direction shown by the arrow in FIG.

As shown in FIG. 11, the photosensitive drum 10 has flange members 10a and 10b at both ends for engaging and fixing the same. The gear G integrated with the flange member 10b is supported by bearings B1 and B2 fitted in the bearing 10b and is rotatably supported. Is rotated at a constant speed in the direction. Reference numeral 12A denotes a lead wire from a light emitting element (LED) of an image exposure unit described later.

Scorotron charger 11 as charging means
Are used in image forming processes of yellow (Y), magenta (M), cyan (C), and black (K), and face the photosensitive drum 10 in a direction orthogonal to the moving direction of the photosensitive drum 10. Attached to the photosensitive drum 1
0 and a control grid maintained at a predetermined potential with respect to the above-described organic photosensitive layer, and a corona discharge having the same polarity as that of the toner using, for example, a saw-tooth electrode as the discharge electrode 11a. ) To apply a uniform potential to the photosensitive drum 10. Discharge electrode 1
As 1a, it is also possible to use a wire electrode or a needle electrode.

Exposure device 12 as image exposure means for each color
The exposure position on the photosensitive drum 10 is provided between the discharge electrode 11a of the scorotron charger 11 and the developing position of the developing device 13 on the upstream side in the rotation direction of the photosensitive drum with respect to the developing sleeve 131. It is arranged in a state.

The exposure device 12 is a linear exposure element 12a in which a plurality of LEDs (light emitting diodes) as image exposure light emitting elements arranged in the main scanning direction in parallel with the axis of the photosensitive drum 10 are arranged in an array. And a SELFOC lens 12b as an equal-magnification imaging element are configured as an exposure unit attached to a holder (not shown). For the holding member 20,
The exposure device 12 for each color is attached to the photosensitive drum 10.
Of the substrate. Image data of each color read by a separate image reading device and stored in the memory is sequentially read from the memory and input to the exposure device 12 for each color as an electric signal.

As an exposure element, a plurality of light-emitting elements such as FL (phosphor emission), EL (electroluminescence), PL (plasma discharge), and LED (light-emitting diode) are arranged in an array. The emission wavelength of the light emitting element used in this embodiment is usually Y, M, C
In the range of 780 to 900 nm, which has a high toner permeability, the color toner is not sufficiently transparent since the image exposure is performed from the back side.
The wavelength may be up to 700 nm.

The color order in which an image is formed and the developing unit 13 provided on the rotating photosensitive drum in accordance with the color order
In the present embodiment, the Y and M developing units 13 are located on the left side of the photosensitive drum 10 with respect to the rotation direction of the photosensitive drum 10 as indicated by arrows in FIG. Are arranged on the right side of the photosensitive drum 10 and the Y and M developing devices 1
3 and a scorotron charger 11 for C and K above the developing casing 138 of the developing unit 13 for C and K, respectively.
Is arranged.

The developing device 13 as a developing means for each color includes
One-component or two-component developers of yellow (Y), magenta (M), cyan (C) and black (K) are accommodated, respectively, and a predetermined gap is maintained with respect to the peripheral surface of the photosensitive drum 10, respectively. At the developing position, the photosensitive drum 10 rotates in the same direction as the rotating direction of the photosensitive drum 10.
m, cylindrical developing sleeve 131 made of non-magnetic stainless steel or aluminum material having an outer diameter of 15 mm to 25 mm
It has.

The developing unit 13 is moved to a predetermined distance from the photosensitive drum 10 by an abutting roller (not shown), for example, 100 μm.
In the developing operation of the developing device 13 for each color, a developing bias to which a DC voltage or a further AC voltage AC is applied is applied to the developing sleeve 131 so that the developing device 131 accommodates the developing device. Jumping development with a component or two-component developer is performed, and a DC bias of the same polarity as the toner (minus polarity in the present embodiment) is applied to the negatively charged photosensitive drum 10 that grounds the transparent conductive layer. Thus, non-contact reversal development for attaching toner to the exposed portion is performed. At this time, the precision of the development interval needs to be about 20 μm or less in order to prevent image unevenness.

The developing unit 13 for each color applies a developing bias voltage to the electrostatic latent image on the photosensitive drum 10 formed by the charging by the scorotron charger 11 and the image exposure by the exposure device 12. In the non-contact state by the non-contact developing method described above, inversion is performed with toner having the same polarity as the charged polarity (in the present embodiment, the photosensitive member is negatively charged and has negative polarity).

As an original image, an image read by an image sensor of an image reading apparatus separate from the apparatus or an image edited by a computer is temporarily stored as image data for each color of Y, M, C and K. And stored.

When the image recording is started, the gear 10G provided on the rear flange 10b of the photosensitive drum 10 is rotated through the driving gear G1 by starting the photosensitive drum drive motor (not shown), and the photosensitive drum 10 is moved to the position shown in FIG. , And at the same time, the developing casing 138 of the yellow (Y) developing device 13 on the left side of the photosensitive drum 10.
The application of a potential to the photosensitive drum 10 is started by the charging action of the Y scorotron charger 11 arranged below the photosensitive drum 10.

After the photosensitive drum 10 is applied with a potential, the first color signal, that is, Y
Exposure by an electric signal corresponding to the image data is started, and an electrostatic latent image corresponding to the Y image of the original image is formed on the photosensitive layer on the surface by rotating and scanning the drum.

The latent image is reversal-developed by the Y developing device 13 in a state where the developer on the developing sleeve is not in contact with the developer, and a yellow (Y) toner image is formed according to the rotation of the photosensitive drum 10.

Next, the photosensitive drum 10 has a magenta (M) developing device 1 on the yellow (Y) toner image and further on the left of the photosensitive drum 10 and above the yellow (Y).
An electric signal corresponding to the second color signal of the M exposure device 12, that is, the M image data, is applied by the charging action of the magenta (M) scorotron charger 11 disposed below the third developing casing 138. Is performed, and a magenta (M) toner image is sequentially superimposed on the yellow (Y) toner image by non-contact reversal development by the M developing unit 13.

By the same process, the developing casing 13 of the developing unit 13 for cyan (C) is located on the right side of the photosensitive drum 10.
The cyan (C) toner image corresponding to the third color signal is further provided by the cyan (C) scorotron charger 11, the exposure device 12 for C, and the developing device 13 for C, which are disposed above the photoconductor 8 A black (K) scorotron charger 11, an exposure device 12, and a developing device 13 disposed on the right side of the drum 10 and below the developing casing 138 of the black (K) developing device 13 at a lower portion of the fourth color C. A black (K) toner image corresponding to the signal is sequentially superimposed and formed.
A color toner image is formed on the peripheral surface within one rotation of the photosensitive drum 10.

The exposure of the organic photosensitive layer of the photosensitive drum 10 by the Y, M, C and K exposure devices 12 is performed from the inside of the drum through the above-mentioned transparent substrate. Therefore, the exposure of the images corresponding to the second, third, and fourth color signals is performed without any influence from the previously formed toner image, and the same exposure as the image corresponding to the first color signal is performed. It is possible to form an electrostatic latent image.

The recording paper P, which is a transfer material, is sent out from a paper feed cassette 15 which is a transfer material storage means, and is conveyed to a timing roller 16. The color toner image formed on the peripheral surface of the photoconductor drum 10 is transferred to the photoconductor drum 10 by the driving of the timing roller 16 in the transfer device 14a.
The image is transferred onto a recording sheet P, which is a transfer material fed in synchronization with the upper toner image.

The recording paper P to which the toner image has been transferred is subjected to static elimination in the static eliminator 14b, separated from the drum peripheral surface, and then conveyed to the fixing device 17 by the conveying belt 14e as conveying means. After being heated and pressed in the fixing device 17 to fuse and fix the toner on the transfer paper P, the toner is discharged from the fixing device 17, conveyed by a pair of discharge conveyance rollers 18 a, and is transferred to the upper tray of the apparatus via the discharge rollers 18. Is discharged with the toner image surface facing down.

On the other hand, the photosensitive drum 10 from which the recording paper P has been separated is rubbed on the surface of the photosensitive drum 10 by a cleaning blade 19a in a cleaning device 19 to remove and clean the residual toner to form a toner image of an original image. Or temporarily stop and start forming a toner image of a new document image. The waste toner scraped off by the cleaning blade 19a and the cleaning roller 19b is discharged to a waste toner container (not shown) by the toner conveying screw 19c. After the cleaning is completed, the cleaning blade 19a and the cleaning roller 19
b is kept away from the photosensitive drum 10 in order to prevent the photosensitive drum 10 from being damaged.

Example 1 1. Preparation of cylindrical plastic substrate Addition of azobisisobutyronitrile as a catalyst for promoting polymerization to methyl methacrylate monomer, heat treatment at 40 ° C for 1 hour, pre-polymerization, and syrup-like polymerizable liquid having a viscosity of 100 cp The material was obtained. Using the apparatus described with reference to FIG.
The mixture was poured into a 0 cm cylindrical mold, the mold was rotated, and the entire mold was subjected to heat treatment at 100 ° C. for 8 hours with steam while being brought into close contact with the inner wall of the mold by centrifugal force, thereby causing polymerization. Annealing is carried out at that temperature for another 2 hours, and then 10 ° C. /
After cooling to room temperature at a speed of one minute, the cylindrical plastic substrate is separated from the mold. After peeling, the gantry was taken out of the steam chamber, the mold was removed from the gantry, and the cylindrical plastic substrate was taken out of the mold. The obtained base body was subjected to cutting processing of an end portion and buffing to obtain an outer diameter of 100 mm and a length of 360 mm.
Thus, two cylindrical plastic substrates having a cylindricity of about 20 μm and a roundness of about 20 μm were obtained. Further, if necessary, the outer peripheral surface was cut with a cutting tool to obtain a cylindrical plastic substrate.

The outer peripheral surface of the cylindrical plastic substrate is subjected to the above-mentioned ultraviolet irradiation treatment to generate a polar group on the surface, and is dip-coated on the cylindrical plastic substrate with a coating solution obtained by mixing a binder and ITO to form a visible light. Thus, a cylindrical plastic substrate having a conductive layer having a transmittance of 85% for infrared light was obtained.

Coating liquid ITO (average particle size, 100 Å) 4 parts by weight Alcohol-soluble polyamide CM-8000 (manufactured by Toray Industries, Inc.) 10 parts by weight Methanol 80 parts by weight 1-butanol 20 parts by weight Coating of OPC Alcohol-soluble polyamide CM-8000 (manufactured by Toray Industries, Inc.) 4 parts by weight Methanol 80 parts by weight 1-butanol 20 parts by weight were mixed and dissolved to obtain an undercoat layer coating solution. The coating solution was dip-coated on a cylindrical plastic substrate to obtain an undercoat layer having a thickness of 0.5 μm.

Next, 4 parts by weight of Y-type titanyl phthalocyanine, 45 parts by weight of a silicone resin solution KR-5240 (manufactured by Shin-Etsu Chemical Co., Ltd.), and 100 parts by weight of 2-butanone were mixed and dispersed by a sand mill for 10 hours. A coating solution was obtained. This coating solution was applied onto the undercoat layer by dip coating to obtain a charge generation layer having a thickness of 0.25 μm.

Charge transporting substance T-1 8 parts by weight Bisphenol Z-type polycarbonate Z-300 (manufactured by Mitsubishi Gas Chemical Co., Ltd.) 12 parts by weight 1,2-dichloroethane 100 parts by weight

[0104]

Embedded image

Were mixed and dissolved to obtain a charge transport layer coating solution. This coating solution was applied onto the charge generation layer by dip coating to obtain 9
Heat treatment was performed at 0 ° C. for 1 hour to form a charge transport layer having a thickness of 25 μm, thereby obtaining a photosensitive drum of the present invention.

3. Image Output Evaluation An electrophotographic internal exposure type color image forming apparatus having the structure described in FIG. 10 was mounted with the photosensitive drum of the present invention to perform image output. Obtained. In particular, no unevenness of density or color tone was observed on the image, and an image having excellent uniformity was obtained. In such an image having excellent uniformity, no change in image quality was recognized even after continuous 30,000 prints. In particular, no peeling of the conductive layer or the organic photosensitive layer was detected.

Example 2 A cylindrical plastic substrate was obtained in the same manner as in Example 1.

The outer peripheral surface of the cylindrical plastic substrate was subjected to the corona discharge treatment to form a polar group on the surface, and immersed in the cylindrical plastic substrate with a coating solution obtained by mixing a binder and ITO as in Example 1. Coating was performed to produce a cylindrical plastic substrate having a conductive layer having a transmittance of 85% for visible light and infrared light, and an electrophotographic photoconductor was obtained by the same manufacturing method as in Example 1. When the photosensitive drum of the present invention was mounted on an electrophotographic internal exposure type color image forming apparatus having the structure described above and an image was formed, an image having a sufficient density without fog was obtained. Especially,
No unevenness in density or color tone was observed on the image, and an image having excellent uniformity was obtained. Such an image with excellent uniformity is continuous 3
No change in image quality was observed after 10,000 prints. Especially,
No peeling of the conductive layer or the organic photosensitive layer was detected.

[0109]

According to the first and second aspects of the present invention, there is provided an electrophotographic photosensitive member having good coating performance of an organic photosensitive layer, particularly, a conductive layer on a cylindrical plastic substrate, and a method for producing the same.

According to the third or fourth aspect, the cylindrical plastic substrate is polymerized in a uniform thickness with no distortion or stress, and the photosensitive material for electrophotography is uniform in thickness without distortion or stress. A body and a method of making the same are provided.

[Brief description of the drawings]

FIG. 1 is a view showing steps of a method for manufacturing a cylindrical plastic substrate of an electrophotographic photosensitive member.

FIG. 2 is a sectional view showing one embodiment of the manufacturing apparatus of FIG.

FIG. 3 is a diagram showing one embodiment of a coupling unit.

FIG. 4 is a diagram showing a gantry.

FIG. 5 is a view showing insertion of a gantry into a steam chamber.

FIG. 6 is a diagram showing one embodiment of a method of connecting driving means.

FIG. 7 is a diagram showing another example of a method of connecting the driving means.

FIG. 8 is a cross-sectional view showing one embodiment of the configuration of the electrophotographic photosensitive member of the present invention.

FIG. 9 is a perspective view of the electrophotographic photosensitive member of FIG. 8;

FIG. 10 is a cross-sectional configuration diagram of a color image forming apparatus showing an example of an image forming apparatus to which the electrophotographic photosensitive member of the present invention made of a cylindrical plastic substrate is applied.

FIG. 11 is a side sectional view showing a state where the electrophotographic photosensitive member is mounted on the apparatus main body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical plastic substrate 2 Conductive layer 3 Organic photosensitive layer (OPC) 4 Charge generation layer (CGL) 5 Charge transport layer (CTL) 6 Processing layer 10 Photoconductor drum 11 Scorotron charger 12 Exposure device 13 Developing device 100 Model 200 stand 300 steam chamber 401 connecting member 402 receiving member M, M1 drive motor

Claims (4)

[Claims] 1. An electrophotographic photoreceptor formed by sequentially applying a conductive layer and an organic photosensitive layer on a light-transmitting substrate, and a method for manufacturing the same, wherein the light-transmitting substrate is formed by resin-molding a polymerizable liquid material. A photoconductor for electrophotography, comprising: forming a conductive layer on a surface of a cylindrical plastic substrate after irradiating the surface of the cylindrical plastic substrate with ultraviolet rays. 2. A photoconductor for electrophotography, wherein a conductive layer and an organic photosensitive layer are formed by sequentially applying a conductive layer and an organic photosensitive layer on a light-transmitting substrate, and a method of manufacturing the same. A photoconductor for electrophotography, wherein a conductive layer is formed after performing corona discharge treatment on the surface of the cylindrical plastic substrate, and a method for manufacturing the same. 3. The cylindrical plastic substrate is prepared by adjusting the polymerizable liquid material, injecting it into a cylindrical mold, disposing the mold horizontally, polymerizing by applying rotation and heat, and forming a resin-molded cylindrical body. The outer diameter of the cylindrical substrate molded by the inner diameter of the mold is 50 to 200 mm, and the thickness of the molded substrate of the cylindrical substrate is 1 to 5 mm.
3. The electrophotographic photoreceptor according to claim 1, wherein the photoreceptor is molded using a polymerizable liquid material. 4. A liquid viscosity of the polymerizable liquid material is from 10 to 3.
4. The method according to claim 3, wherein the time is 00 millipascal-seconds.
3. The electrophotographic photoreceptor of claim 1 and a method for producing the same.