JPH11167219A - Substrate for electrophotographic photoreceptor, its production, electrophotographic photoreceptor and image forming method and image forming device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to form bright images free of image unsharpness without decreasing and scattering light for image exposure from the inside by using an electrophotographic photoreceptor housing an exposure device within a photoreceptor substrate. SOLUTION: This substrate for the photoreceptor is constituted by successively coating the surface of a transparent substrate with a conductive layer and an org. photosensitive layer. In such a case, this photoreceptor is made from a vinyl base polymer and is formed by buffing the substrate surface. The transparent substrate may be manufactured from a centrifugal polymn. method. The surface roughness Rz of the transparent substrate is preferably <=3 μm and the waving thereof is <=5 μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate for an electrophotographic photosensitive member used for image formation of a color copying machine, a color printer, a light printing device, etc., a method of manufacturing the same, an electrophotographic photosensitive member, and an image using the same. The present invention relates to a forming method 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, charging, image exposure and development are performed on a rotating drum or belt-shaped electrostatic image forming body, and toner is formed on the electrostatic image forming body. An image is formed, and the toner image is transferred to a transfer material and fixed. In order to fulfill this function, the electrostatic image forming body is maintained without changing the distance and pressure contact with the charger, exposure device, developing device, transfer device, static eliminator, cleaning device, etc. disposed around it. It must be maintained at a predetermined timing and move at a constant speed.

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.

In recent years, attention has been paid to a type of electrophotographic color image forming apparatus that exposes the inside of a photosensitive body through a cylindrical transparent substrate. This is because it is currently considered to be the most excellent configuration to meet the recent user needs of being able to obtain high-quality color images at high speed and to be compact in order to save space in offices and the like. .

Accordingly, the applicant of the present invention has disclosed in Japanese Patent Application No.
No. 983 proposes a method for producing a transparent and highly accurate substrate using a synthetic resin that is lightweight, has excellent impact resistance, and is low in cost.

[0006]

However, the resin substrate used in the above-mentioned Japanese patent application has a smooth surface on the inner side that is not in contact with the mold, but has a smooth surface on the outer side. When it is pulled out from the substrate, it often becomes uneven and cannot be used as it is as a substrate for an electrophotographic photosensitive member. In addition, methods other than the above-mentioned patent application, such as injection molding and extrusion molding, which are common resin molding methods, require finishing by post-processing due to low dimensional accuracy.

If the surface of the substrate material is low in smoothness, light exposed from inside the photoreceptor is scattered at the interface between the substrate and the photosensitive layer, causing a problem in that the image is disturbed. In order to obtain a clear image, it is desirable to control the surface roughness and the surface undulation within a region where light scattering hardly occurs.

The present invention uses an electrophotographic photoreceptor in which an exposure device is housed inside a photoreceptor base, and forms clear images without image blur without reducing or scattering light for image exposure from the inside. An object of the present invention is to provide a base for an electrophotographic photosensitive member, a method for producing the same, an electrophotographic photosensitive member, and an image forming method and an image forming apparatus using the same.

[0009]

The object of the present invention is achieved by adopting the following constitution.

(1) An electrophotographic photosensitive member substrate in which a conductive layer and an organic photosensitive layer are sequentially coated on a transparent substrate, wherein the transparent substrate is made of a polymer, and the surface of the substrate is buff-polished. Substrate for an electrophotographic photoreceptor.

(2) In a method of manufacturing a substrate for an electrophotographic photosensitive member, in which a conductive layer and an organic photosensitive layer are sequentially coated on a transparent substrate, the transparent substrate is made of a polymer, and the surface of the substrate is buff-polished. A method for producing a substrate for an electrophotographic photosensitive member, comprising:

(3) An electrophotographic photoreceptor comprising a conductive substrate and an organic photosensitive layer sequentially coated on a transparent substrate, wherein the transparent substrate is made of a polymer and the surface of the substrate is buff-polished. Photoreceptor.

(4) The electrophotographic photoreceptor according to (3), wherein the electrophotographic photoreceptor is an electrophotographic photoreceptor for incorporating an image exposure device inside a transparent substrate to perform image exposure from inside the substrate.

(5) The electrophotographic photosensitive member according to (3), wherein a vinyl polymer is used as the polymer.

(6) The electrophotographic photosensitive member according to (3), wherein the transparent substrate is produced by a centrifugal polymerization method.

(7) The transparent substrate has a surface roughness Rz of 3
(3) The electrophotographic photoreceptor according to (3), wherein the undulation is 5 μm or less.

(8) The step of uniformly charging the surface of the electrophotographic photosensitive member according to (3), the step of imagewise exposing the uniformly charged surface from the transparent substrate side of the electrophotographic photosensitive member, and the image exposure. An image forming method, wherein a multicolor toner image is formed on an electrophotographic photosensitive member by repeatedly performing a step of forming a toner image by development later, and thereafter, the formed multicolor toner image is collectively transferred.

(9) The surface of the electrophotographic photosensitive member described in (3) is uniformly charged, and image exposure and development are repeated to form a multicolor superimposed image, which is collectively transferred to a transfer material, separated, fixed, and exposed. An image forming apparatus for forming an image through a body cleaning process.

As described above, in Japanese Patent Application No. 7-13983 (centrifugal polymerization method), a transparent, light-weight substrate having good dimensional stability and excellent impact resistance is used, and a low-cost synthetic resin is used. Manufacturing methods have been proposed. The resin is methacrylic acid ester resin or the like, and is easy to manufacture and inexpensive, and can be said to be epoch-making as compared with the conventional method.

However, according to the study of the present inventors, when a photosensitive layer is applied during the production of a photosensitive member, the surface roughness and undulation of the substrate surface may still be insufficient. And it was difficult to obtain a clear image. The present inventors have conducted intensive studies and found that the surface of the base material can be achieved by buffing. Further, Rz is 0.30 μm or less, and surface undulation is 5 μm.
m or less, and it has become possible to provide a high-quality photoreceptor, an image forming method and an apparatus.

The surface roughness Rz in the present invention is represented by the following as described in FIG.

Surface roughness Rz (10-point average roughness) It was determined from the difference between the average height of five peaks and the average height of five valleys between the lengths L.

Surface waviness (W _CM ) A value based on the standard length 0.25 of JIS B0610.

Conventionally, various means such as a polishing method have been used as a method for smoothing the surface of a metal drum such as an aluminum drum. It is difficult to precisely control the surface roughness of a material such as a plastic polymer that is easily plastically deformed, easily damaged, and hardly dissipates heat by accumulating heat. Polishing methods include sandblasting, honing,
There are buff polishing and the like. Among them, it has been found that buff polishing has better uniformity and surface property than surface polishing of plastic polymer.

The buffing has a wide selection of buffing and polishing agents, and can be selected according to the properties of the polymer material. Therefore, by performing buff polishing at least in the final finishing step, a substrate having good surface roughness and good transparency can be obtained.

In the buff polishing, the buff has flexibility, and the surface layer tends to be processed following the surface of the workpiece, so that undulation is likely to occur depending on conditions. The surface roughness is preferably Rz 3.0 μm or less, more preferably 0.03 μm.
1 to 2.0 μm is good. The undulation is preferably 5.0 μm or less.

In any case, if the buffing is not performed, various scratches generated during the production, processing or transportation of the polymer are not removed, causing image defects, and defocus during exposure from the inner surface of the substrate. This may cause a decrease in resolution or blurring.

Although the buffing may be performed in one process,
When it is desired to make the flaw deeper and smoother, it is more preferable to carry out in two steps. For example, it is preferable to first perform rough buff polishing and then perform finish buff polishing to adjust the surface roughness.

The rough buff polishing is shown as an example in FIGS. 3 (a) and 3 (b). That is, the rough buffing roll 2
(For example, composed of cotton, hemp, flannel, felt, rubber, resinoid, polyvinyl alcohol resin, leather, etc.)
Is placed in contact with the base drum so as to rotate in the circumferential direction of the base drum 1, the abrasive 4 is sprayed on the surface from the spray nozzle 3, and the rough buffing roll 2 is rotated in the direction of the arrow. When the rough buffing roll 2 is a thin roll as shown in FIG. 3B, while rotating the rough buffing roll,
Buffing may be performed by reciprocating in the rotation axis direction of the base drum.

FIG. 4 shows an example of the finish buff polishing. In FIG. 4, since the material and performance are different from those of FIG. 3, such as a buffing roll, the numbering of members is changed.

A finishing buffing roll 5 rotating in the rotation axis direction of the base drum 1 subjected to the rough buff polishing is disposed in contact with the base drum, and an abrasive 7 is sprayed from a spray nozzle 6 onto the surface of the base drum. The finishing buffing polishing is performed by moving the finishing buffing roll 5 in the rotation axis direction of the base drum while rotating while applying a small buffing pressure to the finishing buffing roll 5. In that case, the rotation speed of the finishing buffing roll is 500 to 1000 rpm
m, the moving speed of the finishing buffing roll is 0.5 to 1 m /
min, the rotation speed of the substrate drum is 100 to 1000 rpm
It is better to carry out in the range of m.

As the polishing agent used for the buff polishing, a known polishing agent is used, for example, alumina, silicone boride, emery, ZnO, MgO, SnO ₂ , Fe ₂ O ₃ ,
CrO, Cr ₂ O ₃ , SiC, diamond powder and the like.

As the polymer, in addition to polymethyl methacrylate, which is a vinyl polymer, polyethyl methacrylate, polybutyl methacrylate, polybenzyl methacrylate, polyethyl acrylate, polybutyl acrylate, polystyrene, α-methylstyrene In order to satisfy various performances required for the cylindrical substrate, copolymers such as α-methylstyrene / methyl methacrylate copolymer, methyl methacrylate / benzyl methacrylate copolymer, and homopolymers such as Blends of copolymers are good. Preferably, the polymer is crosslinked to form a solvent-insoluble polymer. As the crosslinking agent, a method using a polyfunctional monomer such as divinylbenzene, diallyl phthalate, and ethylene glycol dimethacrylate, and a polyfunctional isocyanate compound such as tolylene diisocyanate are preferable. Examples of other polymers include polyolefin, polyimide, polyester, polycarbonate, polysulfone, polyethersulfone, polyphenylsulfone, and polymethylpentene.

When a photopolymerizable polymer material is used and light irradiation is performed during polymerization, it is particularly effective to use a material having a high energy level in the ultraviolet region. As the polymerizable liquid material, the above-mentioned various monomers and a liquid material obtained by polymerizing the above-mentioned monomers to some extent are used. In order to use these as a photocurable monomer or polymer, for example, a benzoin-based compound (benzoin-based compound (benzoin , Benzyl, benzoin ethers such as methyl, ethyl, isopropyl, n-
Ethers such as butyl), diphenyl, disulfide,
Alternatively, an organic peroxide or the like may be added.

Next, the cylindrical body of the present invention used for an electrostatic image forming body will be described. The cylindrical substrate of the present invention has a smooth surface, especially in the case of a polymer of methacrylic acid ester, etc., which has extremely high transparency and high strength. Therefore, an exposure device is placed inside the substrate drum and exposure is performed from the inside. It is suitable for an image forming apparatus employing a mechanism.

A typical one is an electrophotographic photosensitive member having a conductive layer and a photoconductive photosensitive layer provided on the surface of a cylindrical substrate. In order to provide the photosensitive layer, a conventionally used method is widely used. I can do it.

As the conductive layer, conductive resin, ITO,
Conventionally known materials such as (indium teine oxide) can be used, but it is necessary to select a material having a transparent material itself or a material having the function even in an extremely thin layer so as not to hinder transparency so much.

In the formation of the photosensitive layer, an inorganic photoconductor layer may be formed by vapor deposition or the like, but an organic photoconductor layer, particularly a function-separated type containing both a charge transporting substance and a charge generating substance, It is desirable to form by applying an organic photoreceptor of a type in which are separately layered.

An undercoat layer (also referred to as an intermediate layer) is provided below the charge generation layer for the purpose of improving the adhesiveness of the photosensitive layer, improving the coating property, covering defects on the substrate, and improving the charge injection property from the substrate to the charge generation layer. ) Is preferably provided. As materials for the undercoat layer, resins such as polyamide, copolymerized nylon, casein, polyvinyl alcohol, cellulose, and gelatin are known. These are dissolved in various organic solvents and applied to a conductive transparent substrate so that the dry film thickness becomes about 0.01 to 5 μm.

The charge generation layer is formed by dispersing a charge generation material (CGM) in a binder resin as required. Examples of CGM include metal or metal-free phthalocyanine compounds, azo compounds such as bisazo compounds and trisazo compounds, squarium compounds, azurenium compounds, perylene compounds, indico compounds, quinacridone compounds, polycyclic quinone compounds, cyanine dyes, xanthene dyes, Examples include, but are not limited to, charge transfer complexes comprising poly-N-vinylcarbazole and trinitrofluorenone. 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, one of perylene compounds, one of imidazole perylene compounds and one of metal phthalocyanine compounds, titanyl phthalocyanine (TiOP)
c) is preferred.

As the binder resin usable for the charge generation layer, for example, polystyrene resin, polyethylene resin, polypropylene resin, polyacryl resin, polymethacryl resin, polyvinyl chloride resin, polyvinyl acetate resin, polyvinyl butyral resin, Epoxy resins, polyurethane resins, 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-acetic acid Examples include, but are not limited to, vinyl copolymer resins, vinyl chloride-vinyl acetate-maleic anhydride copolymer resins, and high molecular organic semiconductors such as poly-N-vinyl carbazole. Among the above, when the imidazole perylene compound is used as the CGM, a preferred binder is polyvinyl butyral resin, and a preferred binder when using TiOPc is a polysilicone resin and a polyvinyl butyral resin, or a mixture of both. No.

The charge transport layer comprises a charge transport material (CTM) alone or together with a binder resin.
Examples of CTM include 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,
Examples include, but are not limited to, benzidine derivatives, poly-N-vinylcarbazole, poly-1-vinylpyrene, poly-9-vinylanthracene, and the like. These may be used alone or in combination of two or more.

As the binder resin usable for the charge transport layer, for example, a polycarbonate resin, a polyacrylate resin, a polyester resin, a polystyrene resin,
Examples thereof include, but are not limited to, styrene-acrylonitrile copolymer resin, polymethacrylate resin, and styrene-methacrylate copolymer resin.

Further, in order to reduce fatigue deterioration upon repeated use or to improve durability, each of the layers of the photoreceptor is provided with a conventionally known antioxidant, ultraviolet absorber, electron-accepting substance, and surface. An environment-dependent reducing agent such as a modifier and a plasticizer can be added 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 protective layer may be a resin-based material such as a polyamide resin or a so-called ceramic-based material using an organic metal compound and a silane coupling agent.

Next, an embodiment of a color image forming apparatus equipped with a photoreceptor using a cylindrical substrate according to the present invention will be described with reference to a sectional view of the image forming apparatus shown in FIG.

110Y, 110M, 110C and 11
0K is yellow (Y), magenta (M), cyan (C)
And a corona charging device used for an image forming process of each color of black (K). The corona charging device performs a charging action by corona discharge in order to maintain a charge of a predetermined potential on the above-described photosensitive layer of the photoconductor 10. On the other hand, a uniform potential is applied.

12Y, 12M, 12C and 12K are
FL (phosphor emission), EL (electroluminescence), PL (plasma discharge), LED (light emitting diode), and light shutter function in which light emitting elements arranged in the axial direction of the photoconductor 10 are arranged in a line in an array. LISA (Magneto-optical effect light shutter array), PLZT with elements arranged in a line
(Transmissive piezoelectric element shutter array), an exposure optical system which is an image exposure apparatus configured as a unit by an exposure element such as an LCS (liquid crystal shutter), and a selfoc lens as an equal-magnification imaging element. Image signals of each color read by the image reading device are sequentially taken out of the memory and input to the above-described exposure optical systems 12Y, 12M, 12C and 12K as electric signals. Each of the exposure optical systems 12Y, 12M, 12C and 12K is attached to a cylindrical holding member 20, and the photosensitive member 10
Of the substrate.

The developing devices 13Y, 13M, 13C and 13K are developing devices using a non-contact developing method for accommodating yellow (Y), magenta (M), cyan (C) and black (K) developers. The developing sleeves 1 rotate in the same direction while maintaining a predetermined gap with respect to the peripheral surface of the photoconductor 10.
30Y, 130M, 130C and 130K.

The developing units 13Y, 13M, 13C and 13K are provided with the above-described corona charging devices 110Y, 110Y.
M, 110C and 110K charging, exposure optical system 1
The electrostatic latent image on the photoconductor 10 formed by the image exposure by 2Y, 12M, 12C and 12K is reversely developed in a non-contact state by applying a developing bias voltage.

An original image is read by an image reading apparatus separate from the present apparatus, and an image read by an image sensor or an image edited by a computer is temporarily converted into image signals for each of Y, M, C and K colors. Stored and stored in memory.

At the start of image recording, the photosensitive member 10 is rotated clockwise by the start of the photosensitive member driving motor, and at the same time, the photosensitive member 10 is charged by the corona charging device 110Y.
Is started.

After the photoreceptor 10 is applied with an electric potential, the exposure optical system 12Y starts exposure with an electric signal corresponding to a first color signal, that is, an image signal of yellow (Y), and the rotation of the drum causes the exposure to be performed. 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 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 in accordance with the rotation of the photosensitive drum 10.

Next, the photosensitive drum 10 is further provided with a corona charger 110M on the yellow (Y) toner image.
The exposure is performed by an electric signal corresponding to the second color signal of the exposure optical system 12M, that is, the image signal of magenta (M), and the non-contact reversal development is performed by the developing unit 13M. A magenta (M) toner image is sequentially superimposed on a yellow (Y) toner image to form.

By the same process, the corona charging device 11
0C, a cyan (C) toner image corresponding to the third color signal by the exposure optical system 12C and the developing device 13C, and a fourth color signal by the corona charging device 110K, the exposure optical system 12K and the developing device 13K. Corresponding black (K) toner images are sequentially superimposed, and a color toner superimposed image is formed on the peripheral surface of the photosensitive drum 10 within one rotation.

These exposure optical systems 12Y, 12M, 12C
Exposure of the photosensitive layer of the photoreceptor drum 10 at 12K and 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 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. In order to stabilize the temperature inside the photosensitive drum and prevent the temperature from rising due to the heat generated by the exposure optical systems 12Y, 12M, 12C and 12K, a material having good heat conductivity is used for the holding member 20.
If the temperature is low, a heater is used, and if the temperature is high, measures such as dissipating heat to the outside through a heat pipe can be taken, so that the temperature can be suppressed to a level that does not cause any trouble.

In the developing operation by the developing devices 13Y, 13M, 13C and 13K, a developing bias to which a direct current or further alternating current is applied is applied to the developing sleeves 130Y, 130M, 130C and 130K, respectively. Non-contact development using a one-component or two-component developer is performed, and a DC bias having the same polarity as that of the toner is applied to the photoconductor 10 that grounds the transparent conductive layer, and reversal development in which the toner adheres to the exposed portion is performed. Is being done.

In this way, the color toner superimposed image formed on the peripheral surface of the photosensitive drum is sent out from the paper feed cassette 15 by the feed roller 15a in the transfer unit 14a, and the timing roller is fed by the feed roller pairs 15b and 15c. The sheet is transferred to a transfer sheet P, which is a transfer material fed in synchronism with the toner superimposed image on the photoconductor 10 by driving the timing roller 16.

The transfer paper P to which the toner image has been transferred is separated from the peripheral surface of the drum by the removal of the charge in the charge eliminator 14b, and then is carried by the transport driving roller 14c and the driven roller 14d.
The fixing device 17 is moved by the conveying belt 14e stretched between the fixing belts.
Transported to The fixing roller 17 in the fixing device 17
a, the toner is heated and pressed between the pressure rollers 17b to fuse and fix the toner on the transfer paper P, and then a pair of fixing exit rollers 17d
Is discharged from the fixing device 17 by the
The sheet was conveyed by 8a and was discharged onto the discharge tray 200 at the upper part of the apparatus via the discharge roller 18, and a clear and extremely good image was obtained using the above-described photosensitive body of the present invention.

On the other hand, the photoreceptor 10 from which the transfer paper has been separated is cleaned by a cleaning device 19 with a cleaning blade 19a.
The surface of the photoreceptor 10 is rubbed to remove the residual toner and is cleaned, and the formation of the toner image of the original image is continued or temporarily stopped to start the formation of a new toner image of the original image. The waste toner scraped off by the cleaning blade 19a is removed by the toner conveying screw 19b.
It is discharged to a waste toner container (not shown).

The image obtained by this image forming process was superimposed by one rotation of the photosensitive drum to obtain a superimposed color image. Therefore, the image was produced at a very high speed, and was excellent in resolution and sharpness.

Since the photosensitive member 10 accommodates the exposure optical system therein, even if the diameter of the drum is relatively small,
The plurality of corona charging devices 110 described above are provided on the outer peripheral surface thereof.
Y, 110M, 110C and 110K, developing unit 13
Y, 13M, 13C and 13K can be provided, 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.

[0064]

EXAMPLES The present invention will be described below in detail with reference to examples, but embodiments of the present invention are not limited thereto.

Example 1 (Examples and Comparative Examples) Production of cylindrical substrate An end portion was cut on the substrate obtained by centrifugal polymerization using methyl methacrylate monomer, and the outer diameter was 100 mm.
A cylindrical substrate having a length of 360 mm was obtained. The surface roughness Rz was 3.5 μm, and the waviness was 5.5 μm. The substrate was subjected to rough buff polishing by the apparatus shown in FIG. 3A, and further to final buff polishing by the apparatus shown in FIG. In each case, a cotton buff was used as the buff, alumina powder having a particle size of 1 to 5 μm and a particle size of 0.05 μm to 0.5 μm was used as the abrasive, and the number of revolutions, moving speed, time, etc. were changed. Roughness,
The cylindrical substrates No. 1-1 to 1-3 were obtained.

A coating solution composition for a conductive layer was applied on the cylindrical substrate as described below to a dry film thickness of 0.5 μm.
Heat treatment was performed at 0 ° C. for 30 minutes.

2. Conductive layer coating solution composition Sumitomo Metal Mining Co., Ltd. conductive coating material X-101H 1000 g Toluene 1000 g On the above substrate, the coating solution composition UCL-1 of the undercoat layer (UCL) was dried as described below. It was applied to a thickness of 5 μm.

[0068] 3. UCL-1 coating solution composition Copolymer nylon resin (CM-8000, manufactured by Toray Industries, Inc.) 3 g Methanol / n-butanol = 10/1 (vol ratio) 1000 ml Coating solution for CGL layer as described below on UCL coated above The composition CGL-1 was applied to a dry film thickness of 0.25 μm.

[0069] 4. CGL-1 coating liquid composition Y-type titanyl phthalocyanine (CGM-1) 20 g Silicone resin (KR-5240 manufactured by Shin-Etsu Chemical Co., Ltd.) 40 g 2-butanone 1000 g The above composition was dispersed using a sand mill for 10 hours.

On the coated CGL, CTL as follows:
Layer CTL-1 was applied to a dry film thickness of 25 μm, and heat-treated at 90 ° C. for 1 hour. 1-1 to 1-3 were obtained.

[0071] 5. CTL-1 coating solution composition CTM-1 80 g Polycarbonate (Z-200 manufactured by Mitsubishi Gas Chemical Co., Ltd.) 120 g 1,2-dichloroethane 1000 g

[0072]

Embedded image

Comparative Example 1 Comparative Example A photoreceptor substrate was prepared in the same manner as in Example 1 except that the substrate was used without buffing. This comparative example substrate was designated No. 1-S, and the photosensitive drum was No. 1-S.

Example 2 (Example and Comparative Example) Preparation of Cylindrical Substrate The substrate obtained by the centrifugal polymerization method of α-methylstyrene / methyl methacrylate / divinylbenzene (weight ratio 2/8 / 0.3) was subjected to end cutting to obtain an outer diameter of 100 mm.
A cylindrical substrate having a length of 360 mm was obtained. This was cut with a diamond single crystal R bite. The surface roughness Rz is 2.
The thickness was 5 μm and the swell was 3.5 μm. Fig. 3
Rough buffing was performed by the apparatus shown in FIG. 4A, and finish buffing was performed by the apparatus shown in FIG. In each case, a polyvinyl alcohol resin system was used as a buff, chromium oxide having a particle size of 0.5 to 5 μm and a particle size of 0.05 to 0.
Using a 4 μm alumina powder, the number of revolutions, the moving speed, the time, etc. were changed, and as shown in Table 1, the cylindrical substrate No. having different surface roughness and undulation was used. 2-1 to 2-3 were obtained.

On the above-mentioned cylindrical substrate, a coating solution composition for a conductive layer as described below was applied so as to have a dry film thickness of 0.5 μm.
Heat treatment was performed at 0 ° C. for 30 minutes.

2. Conductive layer coating solution composition Conductive paint X-101H manufactured by Sumitomo Metal Mining Co., Ltd. 1000 g Toluene 1000 g The coating solution composition UCL-2 of the undercoat layer (UCL) was dried on the above-mentioned substrate as follows. It was applied so as to have a thickness of 0 μm.

[0077] 3. UCL-2 coating solution composition Titanium chelate compound TC-750 (manufactured by Matsumoto Pharmaceutical Co., Ltd.) 200 g Silane coupling agent KBM-503 (manufactured by Shin-Etsu Chemical Co., Ltd.) 130 g 2-propanol 1000 g As described above, the coating liquid composition CGL-1 for the CGL layer was applied to a dry film thickness of 0.25 μm.

[0086] 4. CGL-1 coating liquid composition Y-type titanyl phthalocyanine (CGM-1) 20 g Silicone resin (KR-5240 Shin-Etsu Chemical Co., Ltd.) 40 g 2-butanone 1000 g The above composition was dispersed using a sand mill for 10 hours.

On the coated CGL, CTL as follows:
Layer CTL-1 was applied to a dry film thickness of 25 μm, and heat-treated at 90 ° C. for 1 hour. 2-1 to 2-3 were obtained.

[0080] 5. CTL-1 coating solution composition CTM-1 80 g Polycarbonate (Z-200 manufactured by Mitsubishi Gas Chemical Company) 120 g 1,2-dichloroethane 1000 g Comparative Example 2 Comparative Example The photoreceptor substrate was used as it was without buffing. It was produced in the same manner as in Example 2. This comparative example substrate was designated No. 2-S, and the photosensitive drum was No. 2-S.

Evaluation Method An electrophotographic internal exposure type image forming apparatus having the structure shown in FIG. 1-1 to 1-3,
No. Nos. 2-1 to 2-3, No. 2; 1-S and No. 1; 2-
S was mounted, 10,000 images were output, and image quality evaluation and resolving power evaluation were performed.

Image quality evaluation In this evaluation, character image information was applied to the photoreceptor by LED light, and the quality of the character image formed on plain paper through the image forming process was evaluated as a whole. Also black spots, fog,
Image defects and the like were observed.

Evaluation of resolving power Using a pattern original in which a thin line of 1 mm width and a different number of lines were drawn, the number of read images in the copied image was determined.

Table 1 shows the results.

[0085]

[Table 1]

It can be seen that by buffing the substrate as shown in the present invention, it is possible to obtain a photoreceptor which is free from blurring, fogging, etc., free from image defects, has excellent resolving power, and has high stability of image characteristics.

The substrate of the present invention is disclosed in JP-A-06-2306.
It is easily understood that the present invention can be applied to a system which does not require corona charging as described in Japanese Patent Publication No. 34-34.

[0088]

According to the present invention, by using an electrophotographic photoreceptor in which an exposure device is housed inside a photoreceptor substrate, the image exposure light from the inside is reduced and scattered, and a clear image is formed without image blur. And a method for producing the same, an electrophotographic photosensitive member, and an image forming method and an image forming apparatus using the same.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating Rz.

FIG. 2 is a cross-sectional view of the image forming apparatus of the present invention.

FIG. 3 is a perspective view illustrating an example of rough buff polishing.

FIG. 4 is a perspective view illustrating an example of finish buffing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Base drum 2 Rough buffing roll 3 Spray nozzle for rough buffing 4 Abrasive for rough buffing 5 Finishing buffing roll 6 Spray nozzle for finishing buffing 7 Abrasive for finishing buffing 10 Photoreceptor 12Y, 12M, 12C, 12K yellow, magenta, cyan, black exposure optical system (exposure device) 13Y, 13M, 13C, 13K yellow, magenta, cyan, black developer 110Y, 110M, 110C, 110K yellow,
Magenta, cyan, and black corona charging device 15 Paper cassette 16 Timing roller 17 Fixing device 19 Cleaning device P Transfer paper

Claims (9)

[Claims] 1. An electrophotographic photosensitive member substrate comprising a transparent substrate and a conductive layer and an organic photosensitive layer sequentially coated thereon, wherein the transparent substrate is made of a polymer, and the surface of the substrate is buff-polished. Substrates for electrophotographic photoreceptors. 2. A method for producing a substrate for an electrophotographic photosensitive member, comprising sequentially applying a conductive layer and an organic photosensitive layer on a transparent substrate, wherein the transparent substrate is made of a polymer, and the surface of the substrate is buff-polished. A method for producing a substrate for an electrophotographic photosensitive member, which is characterized by the following. 3. An electrophotographic photosensitive member comprising a transparent substrate and a conductive layer and an organic photosensitive layer sequentially coated thereon, wherein the transparent substrate is made of a polymer and the surface of the substrate is buff-polished. Photoconductor. 4. The electrophotographic photoconductor according to claim 3, wherein the electrophotographic photoconductor is an electrophotographic photoconductor for exposing an image from inside the transparent substrate by incorporating an image exposure device inside the transparent substrate. 5. The electrophotographic photoconductor according to claim 3, wherein a vinyl polymer is used as the polymer. 6. The electrophotographic photosensitive member according to claim 3, wherein said transparent substrate is produced by a centrifugal polymerization method. 7. The electrophotographic photoconductor according to claim 3, wherein the transparent substrate has a surface roughness Rz of 3 μm or less and an undulation of 5 μm or less. 8. A step of uniformly charging the surface of the electrophotographic photosensitive member according to claim 3, a step of exposing the uniformly charged surface to an image from the transparent substrate side of the electrophotographic photosensitive member, and after the image exposure. A multicolor toner image is formed on the electrophotographic photosensitive member by repeatedly performing a process of forming the toner image by development, and thereafter,
An image forming method, wherein a formed multicolor toner image is collectively transferred. 9. The electrophotographic photoreceptor according to claim 3, wherein the surface of the electrophotographic photoreceptor is uniformly charged, and image exposure and development are repeated to form a multicolor superimposed image, which is collectively transferred to a transfer material, separated, fixed, and photoreceptor. An image forming apparatus for forming an image through a cleaning process.