JPH08290484A - Cylindrical substrate for forming image, its manufacture and image forming device - Google Patents

Abstract

PURPOSE: To manufacture a cylindrical substrate of high accuracy in roundness, straightness, eccentricity and the like by adjusting a polymerizable liquid material to a specified viscosity, injecting the same into a cylindrical mold, applying the rotation and heat, polymerizing and then annealing, and then cooling and releasing from the mold. CONSTITUTION: In case of manufacturing a cylindrical substrate of high accuracy such as a photosensitive drum or the like as a static charge image forming body of an image forming device, a cylindrical mold C1 having a ground cylindrical inner face of high accuracy is provided, and both ends of the mold C1 are retained in the liquid-tight state by a mold retaining component C3. The internal temperature of the mold C1 is measured by a thermometer C5, and a heating component C2 is controlled based on the measurement result, and in the state of adjusting properly the temperature of the mold C1, a polymerizable liquid material having the viscosity adjusted in the range of 10cp or over to 40 cp or under is injected from an injection opening C4. Then, molding is carried out by rotating the C1 at a high speed, and subsequently the material is annealed, cooled and released to manufacture a required cylindrical substrate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical substrate used for a photosensitive drum of an image forming apparatus, a manufacturing method for manufacturing the cylindrical substrate, and a photosensitive drum provided with a photosensitive layer on the cylindrical substrate. The present invention relates to an image forming apparatus, and more particularly to a synthetic resin cylindrical base for image formation, a method for manufacturing the same, and an image forming apparatus.

[0002]

2. Description of the Related Art In an image forming apparatus for forming an image by an electrophotographic method, a rotating drum or belt-like electrostatic charge image forming body is charged, image-exposed and developed to form a toner on the electrostatic charge image forming body. An image is formed, and the toner image is transferred and fixed on a transfer material. In order to fulfill its function, the electrostatic charge image forming body does not change the interval and pressure contact state with the charging device, the exposure device, the developing device, the transfer device, the static eliminator, the cleaning device, etc. arranged around the electrostatic charge image forming member. It must be maintained and move at a constant speed at a given timing. In order to be used repeatedly, when the role in the image forming process of one cycle 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 make this series of movements smooth and to use expensive members such as photoconductors efficiently, in the practically used device, as a photoconductor (electrostatic charge image forming body), almost all of the peripheral surface of the cylindrical substrate is used. Although a photosensitive drum provided with a photosensitive layer is used, a metal material such as aluminum is often used as the material of the cylindrical substrate. However, there was a limit to the cost reduction when using a metal material to form a cylindrical substrate by machining.

On the other hand, plastic is considered to be a preferable material because it is light in weight and low in cost, but it is not easy to produce an electrostatic charge image forming member in a cylindrical shape with high accuracy and industrially efficiently. The main reason for this is that we could not find a method for easily and accurately manufacturing a cylindrical substrate having the required size and shape with a roundness of ± 50 μm. For this reason, conventionally, after manufacturing a cylindrical substrate, it has been necessary to secure accuracy by machining such as cutting and polishing the surface, resulting in a decrease in productivity and an increase in cost. or,
It also has a drawback that it is weak against heat and solvents, and besides the accuracy of the surface of the substrate, strength and deformation over time pose problems.

Further, as will be described in detail later, for an image forming apparatus configured to perform image exposure from the inside of the electrostatic charge image forming body, the cylindrical substrate of the electrostatic charge image forming body is exposed to light from the inside. On the other hand, it must be transparent, and no metal can be used as the base material. Therefore, the image forming method in which the image is exposed from the inside has a problem in that it cannot be put to practical use in practice, even though the apparatus configuration is excellent.

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

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to produce industrially efficiently and to obtain surface accuracy, especially roundness,
Good dimensional accuracy for straightness, deflection (eccentricity), etc.
It is an object of the present invention to develop a cylindrical substrate for an electrostatic charge image forming apparatus having high overall strength and sufficiently high transparency as necessary, and a method for manufacturing the same, and to provide an image forming apparatus using the same.

[0007]

Means for Solving the Problems The present invention achieves the above-mentioned object. A polymerizable liquid material having a viscosity of 10 cp or more and 400
It is adjusted to a state of cp or less, poured into a cylindrical mold, polymerized by applying rotation and heat, then annealed, cooled to a temperature close to room temperature, and then removed from the mold to produce a cylindrical substrate. A method for producing a cylindrical substrate for image formation, and a polymerizable liquid material having a viscosity of 10 cp or more 40
It was manufactured by injecting it into a cylindrical mold after adjusting it to 0 cp or less, performing polymerization by applying rotation and heat, then performing annealing treatment, cooling to a temperature close to room temperature, and then removing from the mold. The image forming cylindrical substrate and the polymerizable liquid material are adjusted to have a viscosity of 10 cp or more and 400 cp or less, poured into a cylindrical mold, subjected to rotation and heat for polymerization, and then subjected to an annealing treatment. Image forming apparatus characterized in that a photosensitive layer is provided on the peripheral surface of a cylindrical substrate manufactured by removing from a mold by cooling to a temperature close to room temperature to form a photosensitive drum, and an image is formed on the photosensitive drum. Achieved by

[0008]

With respect to the cylindrical base for image formation of the present invention, the cylindrical base for image formation characterized by injecting a polymerizable liquid material into a cylindrical mold and applying rotation and heat to carry out polymerization, and the cylindrical base for image formation The manufacturing method is disclosed in Japanese Patent Application No. 7-139 by the applicant of the present invention.
No. 83 proposed. However, even in this method, the dimensional accuracy was still insufficient. Also,
The yield of the substrate manufactured by this method was insufficient.
As a result of earnest studies, the inventors of the present invention have improved the above-mentioned manufacturing method, and have obtained the following knowledge about the improvement of dimensional accuracy and the yield, thus completing the present invention.

In the method proposed above, the cylindrical substrate, which is the object during the polymerization, has the same mechanical precision as the mold because it is in close contact with the inner surface of the mold, but when the substrate is removed from the mold, the dimensional deformation does not occur. I knew it would happen. There is an appropriate range for the size of the mold to avoid this effect. If the inner diameter is 20 mm or less, peeling from the mold is difficult, and if the inner diameter is 200 mm or more, the deformation caused by the difference in the coefficient of thermal expansion between the mold and the substrate at the time of peeling is large, and the roundness is particularly poor. When the length is 200 mm or less, the size is insufficient for normal image formation, and when the length is 2000 mm or more, the deformation at the time of peeling lacks uniformity in the length direction, and particularly the straightness decreases.

In this method according to the above proposal, the temperature is raised to a high temperature in order to increase the reaction rate during the polymerization, but conventionally, it was cooled to room temperature in this state. Then, internal stress remains in the cylindrical substrate and it is deformed, resulting in a decrease in dimensional accuracy. However, it has been found that deformation can be prevented by performing annealing while cooling from a high temperature for reaction to room temperature.

In this method proposed above, the polymerizable liquid material is injected into a cylindrical mold and then the polymerization is started, but it has been found that the viscosity of the raw material has a proper range. Viscosity 10 cp
In the following, since the liquid sags in the step of injecting the liquid material into the mold and the degree of polymerization in the liquid is low, it takes time to cure and the productivity is poor. On the other hand, when the viscosity is 400 cp or more, the viscosity becomes too high, causing problems such as uneven injection and difficulty in removing bubbles.

The method of the present invention based on the above knowledge can provide a cylindrical substrate having good dimensional accuracy such as roundness and straightness. However, if the outer peripheral surface is further cut, the dimensional accuracy is further improved. Can be manufactured with less tolerance.
If a functional monomer or a cross-linking agent is added and heat-cured if necessary, heat resistance and solvent resistance are further improved, and O
It is possible to further reduce the deterioration of the dimensional accuracy due to the influence of the solvent and heat during the application and drying of PC.

In order to impart conductivity to the cylindrical substrate according to the present invention, the surface may be subjected to a conductivity treatment or conductive fine powder may be added during polymerization. By mounting this substrate on a conventional electrophotographic copying machine or printer, a good image can be obtained, and an image without density unevenness and color unevenness, which occurs especially when the dimensional accuracy is poor, can be obtained.

Further, by properly selecting the raw materials, particularly according to the study by the present inventors, it is possible to obtain a transparent cylindrical substrate by including methacrylic acid ester as the polymerizable liquid material. This is a cylindrical substrate that can be applied to an image forming apparatus that exposes from the inside of an image forming body to obtain a good image, and a photosensitive layer is provided on the peripheral surface of the cylindrical substrate to form a photosensitive drum. An image forming apparatus in which internal exposure is performed on the photosensitive drum to form an image is
The use of the cylindrical substrate according to the present invention has excellent characteristics.

[0015]

EXAMPLE A method of manufacturing a cylindrical substrate for an image forming apparatus according to the present invention will be specifically described as shown in FIG.
FIG. 2 shows an example of the manufacturing apparatus. In the manufacturing apparatus of FIG. 2, C1 is a cylindrical mold, and the inner surface is polished to form a good and highly accurate cylindrical surface. C2 is a heating member that heats from the outside of the mold C1. C3 is a mold holding member that sandwiches the mold C1 from the left and right, and in the sandwiched state, the liquid inside the mold C1 does not leak. C4 is an injection port for injecting the polymerizable liquid material from the injection port C4. C5 is a thermometer, and the temperature inside the mold C1 is measured. This apparatus has a structure in which the axis of the mold C1 is adjusted to be horizontal, a polymerizable liquid material is injected, and then the mold C1 is rotated at a high speed. After the molding, the cylindrical substrate is taken out by moving one of the mold holding members C3 in the direction of arrow B.

In the manufacturing process shown in FIG. 1, a polymerizable liquid material, for example, a methyl methacrylate ester monomer is first synthesized, and a catalyst is added to rapidly polymerize the material to adjust the viscosity to 10 cp or more and 400 cp or less. Pour into a cylindrical mold C1. This cylindrical mold has an inner diameter of 20 mm
200 mm or less and length of 200 mm or more and 2000
It must be less than or equal to mm. This is rotated for each mold and heated appropriately to promote uniform polymerization. After completion of the polymerization, for example, annealing treatment such as extremely gentle temperature reduction is performed, then the temperature is cooled to a temperature close to room temperature, the obtained substrate is taken out of the mold, cut and, if necessary, finished through a cylinder for an image forming apparatus. The substrate is completed.

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

The centrifugal polymerization method of the present invention does not leave die scratches on the surface of the cylindrical 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. The surface is molded to form an extremely smooth inner surface such as a glass surface. Moreover, the strength is higher than that of the cylindrical substrate obtained by the extrusion method, and the mechanical strength is stable without directivity and the heat distortion temperature is excellent. Furthermore, since there is no uneven light refraction when light is transmitted from a place where internal stress is small, it is used as a cylindrical substrate for an electrostatic charge image forming body (photoreceptor), and an image exposure light source is installed inside it. Even when applied to a forming apparatus, the image exposure is not distorted and the image performance is not deteriorated.

Although polymethyl methacrylate is used as the polymerizable resin material in FIG. 1, other polyethylmethacrylate, polybutylmethacrylate, polyethylacrylate, polybutylacrylate, polystyrene, polyimide, polyester are also used. Alternatively, any resin that can be heat-polymerized according to the present invention, such as polyvinyl chloride or a copolymer thereof, can be used.

Next, a description will be given of the case where the cylindrical substrate of the present invention is used for an electrostatic charge image forming body. The cylindrical substrate of the present invention has a smooth surface, and particularly when a polymer of methacrylic acid methyl ester is used, the transparency is extremely good and the strength is high. It is suitable for an image forming apparatus that employs a mechanism that exposes from the inside.

A typical one is an electrophotographic photoreceptor having a conductive layer and a photoconductor photosensitive layer provided on the surface of a cylindrical substrate, which has been conventionally used for providing the conductive layer and the photoconductor photosensitive layer. The method can be widely used.

That is, as a method for forming the transparent conductive layer, metal or metal oxide such as aluminum or ITO (indium tin oxide) is deposited or sputtered, or ITO or alumina conductive fine particles and resin are mixed. A typical example thereof is the formation of a coating film of a conductive resin with a material.

In order to form the photosensitive layer, an inorganic photoconductor layer may be formed by vapor deposition or the like, but an organic photoconductor layer, particularly a function separation type containing both a charge transport substance and a charge generating substance, In particular, it is desirable to form an organic photoconductor of the type in which each of them is separately laminated.

The charge generation layer is formed by dispersing a charge generation material (CGM) in a binder resin as needed. Examples of CGM include azo compounds such as metal or metal-free phthalocyanine compounds, bisazo compounds and trisazo compounds, squarylium compounds, azurenium compounds, perylene compounds, indico compounds, quinacridone compounds, polycyclic quinone compounds, cyanine dyes, xanthene dyes, Examples thereof include charge transfer complexes composed of poly-N-vinylcarbazole and trinitrofluorenone, but are not limited thereto. Further, these may be used as a mixture of two or more kinds, if necessary. However, in order to achieve the object of the present invention at the highest level, one kind of perylene compound, imidazole perylene compound and one kind of metal phthalocyanine compound, titanyl phthalocyanine (TiOPc) is preferable.

Examples of the binder resin usable in the charge generation layer include polystyrene resin, polyethylene resin, polypropylene resin, polyacrylic resin, polymethacryl resin, polyvinyl chloride resin, polyvinyl acetate resin, polyvinyl butyral resin, and poly (vinyl butyral) resin. Epoxy resin, polyurethane resin, polyphenol resin, polyester resin, polyalkyd resin, polycarbonate resin, polysilicone resin, polymelamine resin, and copolymer resin containing two or more of these repeating units, for example, vinyl chloride-acetic acid Vinyl copolymer resin, vinyl chloride-
Examples thereof include, but are not limited to, vinyl acetate-maleic anhydride copolymer resin and high molecular weight organic semiconductors such as poly-N-vinylcarbazole. Among the above, a polyvinyl butyral resin is preferable as a binder when the imidazole perylene compound is used as the CGM, and a polysilicone resin and a polyvinyl butyral resin as a binder when the TIPc is used, or a mixture thereof. Can be mentioned.

The charge transport layer is composed of a charge transport material (CTM) alone or together with a binder resin.
Examples of the CTM include a carbazole derivative, an oxazole derivative, an oxadiazole derivative, a thiazole derivative, a thiadiazole derivative, a triazole derivative, an imidazole derivative, an imidazolone derivative, an imidazolidine derivative, a bisimidazolidine derivative, a styryl compound,
Hydrazone compounds, pyrazoline derivatives, oxazolone derivatives, benzimidazole derivatives, quinazoline derivatives,
Benzofuran derivative, acridine derivative, phenazine derivative, aminostilbene derivative, triarylamine derivative, phenylenediamine derivative, stilbene derivative,
Benzidine derivative, poly-N-vinylcarbazole, poly-
Examples thereof include 1-vinylpyrene and poly-9-vinylanthracene, but are not limited thereto. These may be used alone or in a mixture of two or more kinds.

Examples of the binder resin usable in the charge transport layer include polycarbonate resin, polyacrylate resin, polyester resin, polystyrene resin,
Examples thereof include, but are not limited to, styrene-acrylonitrile copolymer resin, polymethacrylic acid ester resin, styrene-methacrylic acid ester copolymer resin, and the like.

Further, in order to reduce fatigue deterioration after repeated use or to improve durability, conventionally known antioxidants, ultraviolet absorbers, electron accepting substances, surfaces may be used in any of the layers of the photoreceptor. A modifier, a plasticizer, and the like, an environment-dependent reducing agent, and the like can be added in an appropriate amount, if necessary.

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

The substrate is a cross-linking agent for an electrostatic image forming body,
By using a conductivity-imparting agent, a colorant and the like mixed with the polymerizable liquid material, more preferable physical properties can be realized. For example, by adding a crosslinking agent, heat resistance, solvent resistance,
The improvement in strength makes it possible to prevent electrostatic stains such as dust by the conductivity-imparting agent and replace the conductive layer. These are effective for an electrostatic charge image forming body in which external force or heat is applied during use or a solution is applied onto a substrate.

Next, an embodiment of the image forming apparatus of the present invention will be described.
The color image forming apparatus of FIG. 3 will be described. FIG.
FIG. 3 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 manufactured using the cylindrical substrate of the present invention described above is applied.

Reference numeral 10 designates a photosensitive member which is a drum-shaped electrostatic charge image forming member, and comprises a transparent conductive layer and a charge generating layer on the outer periphery of a cylindrical substrate formed of a highly transparent polymethylmethacrylate polymer resin. A function-separated organic photosensitive layer including a charge transfer layer and a charge transfer layer is formed. 110Y, 110M, 11
0C and 110K are scorotron charging devices used in the image forming process of each color of yellow (Y), magenta (M), cyan (C), and black (K). In order to retain the electric charge of the electric potential, a charging action is performed by corona discharge, and a uniform electric potential is given to the photoconductor 10.

12Y, 12M, 12C and 12K are photoconductors 10.
The light emitting elements arranged in the axial direction are arranged in a line in an array FL (phosphor emission), EL (electroluminescence), PL (plasma discharge), LED (light emitting diode), and an element having a lamp and an optical shutter function. LISA (photomagnetic effect optical shutter array), PLZ
An exposure optical system, which is an image exposure apparatus configured as a unit with an exposure element such as T (transmissive piezoelectric element shutter array) and LCS (liquid crystal shutter), and a self-occ lens as an equal-magnification imaging element. Image signals of the respective colors read by the image reading device of FIG. 1 are sequentially taken out from the memory, and the exposure optical systems 12Y, 12M, 12C and 12K are provided.
Is input to each as an electric signal. The exposure optical systems 12Y, 12M, 12C and 12K are all mounted on a cylindrical holding member 20 and housed inside the base of the photoconductor 10.

13Y, 13M, 13C and 13K are developing devices which are non-contact developing devices for accommodating yellow (Y), magenta (M), cyan (C) and black (K) developers. And a developing sleeve 130 that rotates in the same direction with a predetermined gap from the peripheral surface of the photoconductor 10, respectively.
It is equipped with Y, 130M, 130C and 130K.

The developing devices 13Y, 13M, 13C and 13K
Is an electrostatic latent image formed on the photoconductor 10 by the charging by the corona charging devices 110Y, 110M, 110C and 110K and the image exposure by the exposure optical systems 12Y, 12M, 12C and 12K by applying a developing bias voltage. Reverse development in a non-contact state.

In the image reading apparatus which is a separate body from this apparatus, the original image is an image read by the image pickup device or an image edited by a computer is once used as an image signal for each color of Y, M, C and K. Stored and stored in memory.

When the image recording is started, the photoconductor driving motor is started to rotate the photoconductor 10 in the clockwise direction, and at the same time, the charging action of the corona charging device 110Y starts to apply the potential to the photoconductor 10.

After a potential is applied to the photoconductor 10, the exposure optical system 12Y starts exposure by an electric signal corresponding to a first color signal, that is, an image signal of yellow (Y), and the rotation scanning of the drum causes the exposure. An electrostatic latent image corresponding to the yellow (Y) image of the original image is formed on the photosensitive layer on the surface.

The latent image is reversal-developed by the developing device 13Y with the developer on the developing sleeve in a non-contact state, and a yellow (Y) toner image is formed according to the rotation of the photosensitive drum 10.

Then, the photosensitive drum 10 is further given a potential on the yellow (Y) toner image by the charging action of the corona charging device 110M, and the second image of the exposure optical system 12M.
Of the magenta (M) toner image by the non-contact reversal development by the developing device 13M, and the toner image of the magenta (M) toner is exposed. The images are sequentially superimposed and formed.

By the same process, the corona charging device 110
Further, a cyan (C) toner image corresponding to the third color signal is generated by C, the exposure optical system 12C, and the developing device 13C, and the corona charging device 110K, the exposure optical system 12K, and the developing device 13 are also provided.
By K, a black (K) toner image corresponding to the fourth color signal is sequentially superposed and formed, and a color toner image is formed on the peripheral surface of the photosensitive drum 10 within one rotation.

These exposure optical systems 12Y, 12M, 12C and
The exposure of the organic photosensitive layer of the photosensitive drum 10 by 12K is performed from the inside of the substrate through the transparent substrate described above.
Therefore, the exposure of the image corresponding to the second, third, and fourth color signals is performed without any influence of the toner image previously formed, and is equivalent to the image corresponding to the first color signal. It is possible to form an electrostatic latent image. In order to stabilize the temperature inside the photoconductor drum and prevent the temperature rise due to the heat generated by the exposure optical systems 12Y, 12M, 12C and 12K, a material having good thermal conductivity is used for the holding member 20, and a heater is used at low temperature. In the case of high temperature, it is possible to suppress the heat to the outside by taking measures such as radiating heat to the outside through a heat pipe. Further, during the developing operation by the developing devices 13Y, 13M, 13C and 13K, a developing bias, which is a direct current or an alternating current, is applied to the developing sleeves 130Y, 130M, 130C and 130K, respectively. Alternatively, jumping development with a two-component developer is performed, and a DC bias of the same polarity as the toner is applied to the photoconductor 10 that grounds the transparent conductive layer, and non-contact reversal development that attaches the toner to the exposed portion is performed. It is supposed to be done.

In this way, the color toner image formed on the peripheral surface of the photosensitive drum is sent from the paper feeding cassette 15 by the sending roller 15a in the transfer device 14a, and is sent to the timing roller 16 by the carrying roller pair 15b and 15c. A transfer sheet P that is a transfer material that is conveyed and is fed in synchronization with the toner image on the photoconductor 10 by driving the timing roller 16.
Is transferred to

The transfer paper P on which the toner image has been transferred is separated from the peripheral surface of the drum by removing the charge in the static eliminator 14b, and is then conveyed between the conveyance drive roller 14c and the driven roller 14d. In the fixing device 17, the fixing roller 17a and the pressure roller 17 are conveyed to the fixing device 17 by 14e.
After being heated and pressure-bonded between b to fuse and fix the toner on the transfer paper P, the toner is ejected from the fixing device 17 by the fixing exit roller pair 17d and is conveyed by the paper ejection conveying roller pair 18a and is ejected via the paper ejection roller 18. The sheet was discharged onto the sheet discharge tray 200 at the upper part of the apparatus, but the one using the photosensitive drum 10 in which the photosensitive layer is provided on the cylindrical substrate of the present invention described above gave a clear and excellent image.

On the other hand, the photosensitive member 10 from which the transfer paper has been separated is rubbed against the surface of the photosensitive member 10 by the cleaning blade 19a in the cleaning device 19 to remove the residual toner and be cleaned to continue forming the toner image of the original image, or The process is temporarily stopped to form a toner image of a new original image. The waste toner scraped off by the cleaning blade 19a is discharged to a waste toner container (not shown) by the toner transport screw 19b.

Since the photoconductor 10 has the exposure optical system accommodated therein, even if the diameter of the drum is relatively small, the plurality of corona charging devices 110Y and 110Y described above are provided on the outer peripheral surface thereof.
M, 110C and 110K, developing units 13Y, 13M, 13C and
It is possible to arrange 13K or the like, and the volume of the apparatus can be made compact by using a small diameter drum having an outer diameter of 30 mm to 150 mm.

(Example) 1. Preparation of Cylindrical Substrate Azobisisobutyronitrile was added as a catalyst for accelerating polymerization to methyl methacrylate monomer, and heat treatment was performed at 40 ° C. for 1 hour to carry out prepolymerization and a syrup-like polymerizable liquid material having a viscosity of 100 cp. Got This polymerizable liquid material is poured into a cylindrical mold having an inner diameter of 100 mm and a length of 80 cm, and the mold is rotated and brought into close contact with the inner wall of the mold by centrifugal force, and the whole mold is heated at 70 ° C. for 8 hours by steam. Was carried out and polymerized. The obtained substrate was subjected to an annealing treatment for cooling to room temperature at a rate of 0.2 ° C./minute, and then taken out from the mold. The end portion of the obtained base body was cut to obtain two cylindrical base bodies having an outer diameter of 100 mm and a length of 360 mm. Further, if necessary, the outer peripheral surface was cut with a cutting tool to obtain a cylindrical substrate of the present invention.

A wavelength of 7
Two cylindrical transparent substrates having a transmittance of 85% for 80 nm light were obtained.

2. Application 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 above coating solution was applied onto the cylindrical transparent substrate of the present invention by dip coating to obtain an undercoat layer having a thickness of 0.5 μm.

Next, Y-type titanyl phthalocyanine 4 parts by weight Silicone resin solution KR-5240 (manufactured by Shin-Etsu Chemical Co., Ltd.) 45 parts by weight 2-butanone 100 parts by weight are mixed and dispersed in a sand mill for 10 hours to form a charge generation layer. A coating liquid 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 transport material T-1 8 parts by weight Bisphenol Z type polycarbonate Z-300 (manufactured by Mitsubishi Gas Chemical Co., Inc.) 12 parts by weight 1,2-dichloroethane 100 parts by weight

[0052]

Embedded image

The above components were mixed and dissolved to obtain a charge transport layer coating liquid. This coating solution is applied onto the charge generation layer by dip coating to obtain 9
Heat treatment was carried out at 0 ° C. for 1 hour to form a charge transport layer having a thickness of 25 μm, and a photoreceptor of an example of the present invention was obtained.

3. Image Output Evaluation When an electrophotographic type internal exposure type color image forming apparatus having the structure shown in FIG. 2 was mounted with a photoconductor having a photosensitive layer on a cylindrical substrate of the present invention and an image was printed, a fog was observed. Sufficient images with no density were obtained. In particular, an image with excellent uniformity was obtained in which no unevenness in density or color tone was observed on the image. With respect to such an image having excellent uniformity, no change in image quality was observed even after continuous 10,000 prints.

[0055]

Industrial Applicability According to the present invention, it is possible to develop a method for producing a cylindrical substrate for an electrostatic charge image forming apparatus which can be produced industrially efficiently, has high surface accuracy, high overall strength, and has sufficiently high transparency. Was completed. Further, by using the cylindrical substrate manufactured by this manufacturing method as a substrate for an image forming body, an image having excellent uniformity can be obtained, and an image forming apparatus having excellent performance suitable for long-term use can be manufactured. done.

[Brief description of drawings]

FIG. 1 is a process drawing of a method for manufacturing a cylindrical substrate for an image forming apparatus of the present invention.

FIG. 2 is a sectional view showing an example of a manufacturing apparatus.

FIG. 3 is a cross-sectional configuration diagram of the image forming apparatus of the present invention.

[Explanation of symbols]

10 Photoreceptor (photoreceptor drum) 12Y, 12M Yellow, magenta, cyan, black exposure optical system (exposure device) 12C, 12K Yellow, magenta, cyan, black exposure optical system (exposure device) 13Y, 13M, 13C, 13K Yellow, magenta, cyan, black developing device 110Y, 110M, 110C, 110K Yellow, magenta, cyan, black corona charging device 15 Paper cassette 16 Timing roller 17 Fixing device 19 Cleaning device P Transfer paper

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Claims (9)

[Claims] 1. A polymerizable liquid material having a viscosity of 10 cp or more and 40 or more.
It is adjusted to a state of 0 cp or less, poured into a cylindrical mold, polymerized by applying rotation and heat, annealed, cooled to a temperature close to room temperature, and then removed from the mold to produce a cylindrical substrate. A method of manufacturing a cylindrical substrate for image formation, comprising: 2. The cylindrical mold has an inner diameter of 20 mm or more and 200 mm or less and a length of 200 mm or more and 2000 mm.
The method for producing a cylindrical substrate for image formation according to claim 1, wherein: 3. The method for producing a cylindrical substrate for image formation according to claim 1, wherein the polymerizable liquid material contains a methacrylic acid ester. 4. The polymerizable liquid material has a viscosity of 10 cp or more and 40.
It was manufactured by injecting it into a cylindrical mold after adjusting it to 0 cp or less, performing polymerization by applying rotation and heat, then performing annealing treatment, cooling to a temperature close to room temperature, and then removing from the mold. And a cylindrical substrate for image formation. 5. The cylindrical mold has an inner diameter of 20 mm or more and 200 mm or less and a length of 200 mm or more and 2000 mm.
The cylindrical substrate for image formation according to claim 4, wherein: 6. The cylindrical substrate for image formation according to claim 4, wherein the polymerizable liquid material contains a methacrylic acid ester. 7. A polymerizable liquid material having a viscosity of 10 cp or more and 40
Cylindrical substrate prepared by pouring into a cylindrical mold adjusted to a state of 0 cp or less, performing polymerization by applying rotation and heat, then performing annealing treatment, then cooling to a temperature close to room temperature and removing from the mold An image forming apparatus, wherein a photosensitive layer is provided on a peripheral surface of the photosensitive drum to form a photosensitive drum, and an image is formed on the photosensitive drum. 8. The cylindrical substrate has an outer diameter of 20 mm or more 2
The image forming apparatus according to claim 7, wherein the length is 00 mm or less and the length is 200 mm or more and 2000 mm or less. 9. The image forming apparatus according to claim 7, wherein in the image formation, image exposure is performed from the inside of the photosensitive drum.