JP2008233299A - Ground plate, photoreceptor, and image forming system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a highly precise cylindrical substrate and flange, which are component parts required for highly precise electrophotographic photoreceptor. <P>SOLUTION: The ground plate 1 includes: a fixed plate 2 having a conductive part fixed to the fitting side face of a flange and engaged with the ground side; a flexible plate 3 bent from the outer edge of the fixed plate, extending along the axis of the cylinder, and entirely accommodated inside a notch formed in the fitting side of the flange; and a contact piece 4 bent in an arc from the extension end of the flexible plate toward the internal face of the cylinder and having the leading end at least extending beyond the notch formed in the fitting side of the flange. The width L1 of the contact piece, the width L2 of the flexible plate, and the width L3 of the notch formed in the fitting side of the flange satisfy a relation expressed by L2<L3<L1. The intersection angle of the fixed plate and the flexible plate is <90° and that of the flexible plate and the contact piece is <50°. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a means for conducting electricity from a conductive cylindrical inner wall and a ground plate.

The present invention relates to a ground plate structure used for an electrophotographic photosensitive member provided in an image forming system such as a copying machine, a printer, and a facsimile. When the electrophotographic photosensitive member is fitted with a flange, the ground plate installed on the flange is wound between the electrophotographic photosensitive member and the flange, or when the flange is fitted, the ground plate is There is a problem that deformation occurs.
In order to solve such a problem, as a means for conducting from a conductive cylindrical inner wall of a conventional image forming system or the like, a wedge-like process is applied to a portion where the flange contacts the conductive substrate, and the end of the conductive substrate is fitted when the flange is fitted. It is known that the conduction is surely ensured by causing the wedge-shaped ground to penetrate into the portion. (See Patent Document 1)
It has also been proposed to provide a stable continuity by providing a groove capable of simultaneously fitting the inner surface and the outer surface of the cylindrical substrate at the flange end when the flange is fitted to the conductive cylindrical substrate. (See Patent Document 2)

Furthermore, when the flange is fitted to the conductive cylindrical base, a conductive resin is used as the resin used for the flange, and the end of the conductive cylindrical base is bitten into the flange by the abutting member after the fitting. Therefore, it is possible to obtain conduction without using a ground plate. (See Patent Document 3)
When fitting the flange to the conductive cylindrical base, the ground plate installed on the flange is provided with a plurality of contact pieces on the portion that contacts the inner wall of the conductive cylindrical base, so that the ground from the drum inner wall during fitting It has been proposed that the force applied to the plate can be made uniform, and that stable conduction is ensured without deforming the ground plate when the shaft pin is inserted. (See Patent Document 4)

When fitting the flange to the conductive cylindrical base, the ground plate installed on the flange is provided with a plurality of contact pieces on the portion that contacts the inner wall of the conductive cylindrical base, so that the ground from the drum inner wall during fitting The force applied to the plate can be made uniform, and stable conduction can be ensured without deforming the ground plate when the shaft pin is inserted. (See Patent Document 5)
There is also a proposal for providing a groove in the shaft in order to obtain a stable conduction between the conductive base and the shaft when the conductive base is inserted by fitting a flange to the conductive base. (See Patent Document 6)

In the method of fitting a flange to a conductive cylindrical substrate, the ground plate provided with a plurality of contact pieces on a portion contacting the inner wall of the conductive cylindrical substrate is provided on the ground plate installed on the flange. There is also a proposal that can be press-fitted without deformation of the base by providing recesses on the left and right sides of the substrate. (See Patent Document 7)
In addition, there is also a proposal in which stable conduction can be obtained by bringing a ground plate in contact with the inner surface of the conductive cylindrical substrate into contact with the tangent line of the inner surface of the cylindrical substrate substantially perpendicularly. (See Patent Document 8)
JP 2001-13821 A JP 2001-249574 A Japanese Patent No. 3275925 Japanese Patent No. 3283786 Japanese Patent No. 3352609 Japanese Patent No. 35199936 Japanese Patent No. 3593521 Japanese Patent No. 3362211

Recently, the above-described electrophotographic system has been made full-color, and color misregistration of multicolor images has become a serious problem. In order to minimize this color misregistration, an electrophotographic photosensitive member with high dimensional accuracy has been demanded.
As described above, the electrophotographic photosensitive member is composed of a cylindrical substrate and a flange, and the cylindrical substrate and the flange, which are constituent parts, are required to have high accuracy in order to improve the accuracy of the electrophotographic photosensitive member. .
There is also a demand for means for more strictly suppressing the deformation of the cylindrical base body due to the fitting of these parts.

The present invention is to meet such a demand, and has the following configuration in order to produce a highly accurate electrophotographic photoreceptor.
(1) A cylindrical body having an opening on at least one side, a flange fitted to the opening of the cylindrical body, and a contact piece fixed to the flange and abutting on the inner surface of the cylindrical body when the flange is fitted In the ground plate, the ground plate is bent from an outer edge of the fixed plate and a fixed plate having a conduction portion fixed to the fitting side surface of the flange and engaged with the ground side. A flexible plate that extends along the axial direction of the cylindrical body, and that is entirely housed inside a notch provided on the fitting side of the flange; and from the extended end of the flexible plate, The contact piece is bent with an arc in the direction of the inner surface of the body and is formed from the contact piece that is at least the tip of the cutout provided on the fitting side of the flange. : L1 and the flexible plate : L2 and the flange cut provided on the fitting side-out of width: relationship L3 has the following relationship,
L2 <L3 <L1
An earth plate, wherein an intersection angle between the fixed plate and the flexible plate is less than 90 deg, and an intersection angle between the flexible plate and the contact piece is less than 50 deg.

(2) The ground plate according to (1), wherein the length of the contact piece is shorter than the length of the slit.
(3) The ground plate according to (1), wherein there are at least two contact pieces.
(4) A cylindrical body having an opening on at least one side, a flange fitted into the opening of the cylindrical body, and a contact piece fixed to the flange and abutting on the inner surface of the cylindrical body when the flange is fitted. In the photosensitive member having a ground plate, the force F1 that the contact piece of the ground plate vertically applies to the wall of the cylindrical body is deformed when the force is applied perpendicularly to the outer surface of the cylindrical body. A ground plate characterized by being smaller than the minimum force F2.
(5) A photosensitive member fitted with a flange having the ground plate structure of (1).
(6) An image forming system using a photoreceptor fitted with a flange having the ground plate structure of (1).

  By using the flange equipped with the ground plate of the present invention, it becomes possible to contact the inner wall of the base body without applying a load more than necessary when the fitting is completed, and it is highly accurate without deforming the end of the cylindrical base body. An electrophotographic photoreceptor can be produced.

Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is an overall view of an electrophotographic photosensitive member provided with a ground plate of the present invention, and FIG. 2 shows an example of the shape of the ground plate of the present invention. FIG. 3 shows a flange equipped with the ground plate of the present invention. FIG. 4 shows a state immediately before the flange on which the ground plate of the present invention is mounted is fitted to the cylindrical substrate for an electrophotographic photosensitive member, and FIG. 5 shows that the flange on which the ground plate of the present invention is mounted is an electrophotographic photosensitive member cylinder. It shows a state of being fitted to the substrate.
FIG. 6 shows a part of the embodiment of the ground plate of the present invention, and FIG. 7 shows a part of the embodiment related to the shape of the tip of the contact plate of the ground plate of the present invention.
FIG. 8A shows the shape of a conventional ground plate, and FIG. 8B shows the shape of the end when a flange having an existing ground plate fitted thereon is fitted to a cylindrical substrate for an electrophotographic photoreceptor. FIG. 9 shows the shape of the end when the flange on which the ground plate of the present invention is mounted is fitted to the cylindrical substrate for an electrophotographic photoreceptor.

First, the earth plate of the present invention will be described with reference to FIGS. The ground plate 1 is composed of the fixing plate 2 and the fixing plate, and is continuously bent by the bending portion 13 and bent from the flexible plate 3 while having an arc. It consists of the contact piece 4 which becomes.
An angle α formed by the fixing plate 2 and the flexible plate 3 is less than 90 °, and an angle β formed by the flexible plate 3 and the contact piece 4 is less than 50 °. .
The width L1 of the contact piece 4 is narrower than the width L2 of the flexible plate 3.

Next, referring to FIG. 3, a flange equipped with the ground plate of the present invention will be described. Mounting holes 10 and 11 are formed in the grounding plate 1 in the fixing plate 2. The mounting holes 10 and 11 are inserted into the protrusions formed on the flange, so that the grounding plate 1 is attached to the grounding plate 1. Attached to the flange 7.
The fixing method after mounting the ground plate is a method of melting and fixing the protruding portion of the flange 7, a method of fixing with an adhesive, and a method of inserting another member into the protruding portion and sandwiching and fixing the ground plate However, any fixing method may be used depending on the situation.

The flange 7 is provided with a slit portion 12 at a portion corresponding to the position of the contact piece 4 when the ground plate 1 is mounted, and the contact portion 4 does not contact the flange 7 The ground plate 1 can be attached to the flange 7.
A width L3 of the slit portion 12 is formed to be narrower than a width L2 of the flexible plate 3 and wider than a width L1 of the contact piece 4.
The slit length L4 of the slit portion is longer than the contact piece length L5.

  FIG. 4 and FIG. 5 show before and after fitting the flange 7 to the cylindrical base 6. When the flange 7 to which the ground 1 is fixed is engaged with the opening of the cylindrical base 6, the end of the cylindrical base 6 contacts the surface of the contact piece 4. Further, when the flange 7 is fitted along the axial direction of the cylindrical base body 6, a force parallel to the axial direction of the cylindrical base body 6 is applied to the contact piece 4 from the end of the cylindrical base body, and the flange 7 and the cylindrical shape are formed. A situation occurs in which the contact piece 4 is caught in the fitting portion of the base.

  However, since the angle α formed by the fixed plate 2 and the flexible plate 3 is less than 90 °, and the angle β formed by the flexible plate 3 and the contact piece 4 is less than 50 °, the flexible plate 3 at the time of fitting. Is inclined inward to the fixed plate 2 side, and the angle β formed by the flexible plate 3 and the contact piece 4 is further bent, so that the force applied to the contact piece 4 is dispersed. Therefore, as shown in FIG. When the fitting is completed, the contact piece 4 does not press unnecessary force on the inner wall of the cylindrical substrate, and therefore, it is possible to manufacture a highly accurate electrophotographic photoreceptor without deforming the cylindrical substrate. It becomes.

FIG. 6 shows an example of the shape of the ground plate, but there may be two or more portions that are in contact with the inner wall of the cylindrical base body as long as they are evenly arranged in the circumferential direction.
Although the example of the shape of the front-end | tip of the contact part 4 is shown in FIG. 7, as long as the maximum width | variety of a front-end | tip is narrower than the width | variety L3 of the slit part 12, there is no problem even if it makes what kind of shape.

FIG. 8 shows the shape of the end portion of the cylindrical substrate when the existing ground plate and the flange equipped with the existing ground plate are fitted to the cylindrical substrate.
When the existing ground plate is used, since the contact piece 4 is installed perpendicular to the flexible plate 3, the force bent by the cylindrical base body is not completely absorbed when the fitting is completed. 4 presses the inner wall of the cylindrical substrate to deform the cylindrical substrate. Therefore, when the shape of the end portion of the cylindrical base body after completion of the fitting is measured, the portion 14 where the contact piece is in contact with the inner wall of the cylindrical base body is deformed on the protrusion, and a highly accurate electrophotographic photoreceptor is obtained. Things are impossible.

  FIG. 9 shows the shape of the end portion of the cylindrical substrate when the flange equipped with the ground plate of the present invention and the existing ground plate is fitted to the cylindrical substrate.

In the ground plate structure of the present invention, when the flange on which the ground plate is installed is fitted to the cylindrical body, the ground plate has a mechanism for escaping inward, so that the base body is not deformed.
In addition, in the ground plate, when the flange on which the ground plate is installed is fitted to the cylindrical body, the flexible plate is connected to the flange even when the end of the cylindrical body and the contact portion of the ground plate come into contact and are drawn. The contact portion is not caught between the flange and the base body.
In addition, by providing a large number of contact portions with the cylindrical body, it is possible to reliably obtain conduction.

Examples are shown below.
(Creation of electrophotographic photoreceptor)
As the photoreceptor, in the first embodiment, the cylindrical substrate and a single-layer photosensitive layer are provided on the substrate, and further include a protective layer, an intermediate layer, and other layers as necessary. It becomes. In the second embodiment, the photosensitive member comprises a cylindrical substrate, and a laminated photosensitive layer having at least a charge generation layer and a charge transport layer in this order on the substrate, and further if necessary. A protective layer, an intermediate layer, and other layers. In the second embodiment, the charge generation layer and the charge transport layer may be laminated in reverse.

-Multilayer type photosensitive layer-
The multilayer photosensitive layer has at least a charge generation layer and a charge transport layer in this order, and further includes a protective layer, an intermediate layer, and other layers as necessary.
The charge generation layer includes at least a charge generation material, a binder resin, and further includes other components as necessary.
There is no restriction | limiting in particular as said charge generation substance, Although it can select suitably according to the objective, Either an inorganic material and an organic material can be used.

The inorganic material is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include crystalline selenium, amorphous selenium, selenium-tellurium, selenium-tellurium-halogen, and selenium-arsenic compounds. It is done.
There is no restriction | limiting in particular as said organic type material, According to the objective, it can select suitably according to the objective, For example, C eye pigment blue 25 (color index CI21180), C eye pigment red 41 ( CI 21200), CI Acid Red 52 (CI 45100), CI Basic Red 3 (CI 45210), azo pigments having a carbazole skeleton, azo pigments having a distyrylbenzene skeleton, triphenylamine Azo pigments having a skeleton, azo pigments having a dibenzothiophene skeleton, azo pigments having an oxadiazole skeleton, azo pigments having a fluorenone skeleton, azo pigments having a bis-stilbene skeleton, azo pigments having a distyryl oxadiazole skeleton, di Has a styrylcarbazole skeleton Azo pigments such as Zo pigment; phthalocyanine pigments such as C.I. Pigment Blue 16 (C.I. 74100); indigo such as C. I.But Brown (C.I. 73410), C.I. Pigments; perylene pigments such as Argol Scarlet 5 (manufactured by Bayer), Indusence Scarlet R (manufactured by Bayer); and squalic dyes. These may be used individually by 1 type and may use 2 or more types together.

There is no restriction | limiting in particular as said binder resin, According to the objective, it can select suitably, For example, a polyamide resin, a polyurethane resin, an epoxy resin, a polyketone resin, a polycarbonate resin, a silicone resin, an acrylic resin, a polyvinyl butyral resin, polyvinyl Formal resin, polyvinyl ketone resin, polystyrene resin, poly-N-vinyl carbazole resin, polyacrylamide resin, and the like can be given. These may be used individually by 1 type and may use 2 or more types together.
If necessary, a charge transport material may be added. In addition to the binder resin described above, a polymer charge transport material can be added as the binder resin for the charge generation layer.

As a method for forming the charge generation layer, a vacuum thin film production method and a casting method from a solution dispersion system can be mentioned.
Examples of the former method include a glow discharge polymerization method, a vacuum deposition method, a CVD method, a sputtering method, a reactive sputtering method, an ion plating method, and an accelerated ion injection method. This vacuum thin film manufacturing method can satisfactorily form the inorganic material or organic material described above.

In order to provide the charge generation layer by the latter casting method, a charge generation layer forming coating solution is used and a conventional method such as a dip coating method, a spray coating method, or a bead coating method is used. Can do.
The organic solvent used for the charge generation layer forming coating solution is not particularly limited and may be appropriately selected depending on the intended purpose. For example, acetone, methyl ethyl ketone, methyl isopropyl ketone, cyclohexanone, benzene, toluene, xylene , Chloroform, dichloromethane, dichloroethane, dichloropropane, trichloroethane, trichloroethylene, tetrachloroethane, tetrahydrofuran, dioxolane, dioxane, methanol, ethanol, isopropyl alcohol, butanol, ethyl acetate, butyl acetate, dimethyl sulfoxide, methyl cellosolve, ethyl cellosolve, propyl cellosolve, Etc. These may be used individually by 1 type and may use 2 or more types together.
Among these, tetrahydrofuran, methyl ethyl ketone, dichloromethane, methanol, and ethanol having a boiling point of 40 ° C. to 80 ° C. are particularly preferable because they can be easily dried after coating.

The charge generation layer forming coating solution is produced by dispersing and dissolving the charge generation material and a binder resin in the organic solvent. Examples of the method for dispersing the organic pigment in the organic solvent include a dispersion method using a dispersion medium such as a ball mill, a bead mill, a sand mill, and a vibration mill, and a high-speed liquid collision dispersion method.
The thickness of the charge generation layer is usually preferably from 0.01 to 5 μm, more preferably from 0.05 to 2 μm.

The charge transport layer is a layer intended to hold a charged charge and to couple the charge generated and separated in the charge generation layer by exposure to the charged charge held by movement. In order to achieve the purpose of holding the charged charge, it is required that the electric resistance is high. Further, in order to achieve the purpose of obtaining a high surface potential with the charged charge that has been held, it is required that the dielectric constant is small and the charge mobility is good.
The charge transport layer includes at least a charge transport material, and includes a binder resin and, if necessary, other components.

Examples of the charge transport material include a hole transport material, an electron transport material, and a polymer charge transport material.
Examples of the electron transporting material (electron-accepting material) include chloranil, bromoanil, tetracyanoethylene, tetracyanoquinodimethane, 2,4,7-trinitro-9-fluorenone, 2,4,5,7-tetranitro. -9-fluorenone, 2,4,5,7-tetranitroxanthone, 2,4,8-trinitrothioxanthone, 2,6,8-trinitro-4H-indeno [1,2-b] thiophene-4-one, 1,3,7-trinitrodibenzothiophene-5,5-dioxide, and the like. These may be used individually by 1 type and may use 2 or more types together.

Examples of the hole transport material (electron donating material) include oxazole derivatives, oxadiazole derivatives, imidazole derivatives, triphenylamine derivatives, 9- (p-diethylaminostyrylanthracene), 1,1-bis- (4 -Dibenzylaminophenyl) propane, styrylanthracene, styrylpyrazoline, phenylhydrazones, α-phenylstilbene derivatives, thiazole derivatives, triazole derivatives, phenazine derivatives, acridine derivatives, benzofuran derivatives, benzimidazole derivatives, thiophene derivatives, etc. It is done. These may be used individually by 1 type and may use 2 or more types together.
Examples of the polymer charge transport material include those having the following structure.

(A) Polymer having a carbazole ring, for example, poly-N-vinylcarbazole, JP-A-50-82056, JP-A-54-9632, JP-A-54-11737, JP-A-4-175337 And the compounds described in JP-A-4-183719 and JP-A-6-234841.
(B) Polymers having a hydrazone structure For example, JP-A-57-78402, JP-A-61-20953, JP-A-61-296358, JP-A-1-134456, JP-A-1- 179164, JP-A-3-180851, JP-A-3-180852, JP-A-3-50555, JP-A-5-310904, JP-A-6-234840, and the like. Is done.
(C) Polysilylene polymers For example, JP-A 63-285552, JP-A-1-88461, JP-A-4-264130, JP-A-4-264131, JP-A-4-264132, Examples thereof include compounds described in Kaihei 4-264133 and JP-A-4-289867.
(D) Polymer having a triarylamine structure, for example, N, N-bis (4-methylphenyl) -4-aminopolystyrene, JP-A-1-134457, JP-A-2-282264, JP-A-2- Examples include compounds described in JP-A-304456, JP-A-4-133605, JP-A-4-133066, JP-A-5-40350, and JP-A-5-202135.
(E) Other polymers For example, formaldehyde condensation polymer of nitropyrene, JP-A-51-73888, JP-A-56-150749, JP-A-6-234836, JP-A-6-234837 The described compounds and the like are exemplified.

  In addition to the above, the polymer charge transporting material includes, for example, a polycarbonate resin having a triarylamine structure, a polyurethane resin having a triarylamine structure, a polyester resin having a triarylamine structure, and a triarylamine structure. And a polyether resin. Examples of the polymer charge transporting material include JP-A 64-1728, JP-A 64-13061, JP-A 64-19049, JP-A-4-11627, JP-A 4-116627. JP 2225014, JP 4-230767, JP 4-320420, JP 5-232727, JP 7-56374, JP 9-127713, JP 9-222740. And compounds described in JP-A-9-265197, JP-A-9-211877, JP-A-9-30495, and the like.

  Examples of the polymer having an electron donating group include not only the above-mentioned polymer but also a copolymer with a known monomer, a block polymer, a graft polymer, a star polymer, It is also possible to use a crosslinked polymer having an electron donating group as disclosed in JP-A-109406.

Examples of the binder resin include polycarbonate resin, polyester resin, methacrylic resin, acrylic resin, polyethylene resin, polyvinyl chloride resin, polyvinyl acetate resin, polystyrene resin, phenol resin, epoxy resin, polyurethane resin, polyvinylidene chloride resin, Examples thereof include alkyd resins, silicone resins, polyvinyl carbazole resins, polyvinyl butyral resins, polyvinyl formal resins, polyacrylate resins, polyacrylamide resins, and phenoxy resins. These may be used individually by 1 type and may use 2 or more types together.
The charge transport layer may also contain a copolymer of a crosslinkable binder resin and a crosslinkable charge transport material.

The charge transport layer can be formed by dissolving or dispersing these charge transport materials and a binder resin in an appropriate solvent, and applying and drying them. In addition to the charge transport material and the binder resin, an appropriate amount of additives such as a plasticizer, an antioxidant, and a leveling agent may be added to the charge transport layer as necessary.
The thickness of the charge transport layer is not particularly limited and can be appropriately selected according to the purpose. The thickness is preferably 5 to 100 μm, and the charge transport layer can be thinned in recent demands for higher image quality. In order to achieve a high image quality of 1200 dpi or more, 5 to 30 μm is more preferable.

-Single layer type photosensitive layer-
The single-layer type photosensitive layer includes a charge generation material, a charge transport material, a binder resin, and other components as necessary.
As the charge generating substance, charge transporting substance, and binder resin, the above-described materials can be used.
As said other component, a plasticizer, microparticles | fine-particles, various additives, etc. are mentioned, for example.
The thickness of the single-layer type photosensitive layer is preferably 5 to 100 μm, and more preferably 5 to 50 μm. When the film thickness is less than 5 μm, the chargeability may decrease, and when it exceeds 100 μm, the sensitivity may decrease.

A protective layer may be provided on the photosensitive layer as necessary. The protective layer contains at least a binder resin, a charge transport material, and, if necessary, other components.
The above-mentioned materials can be used as the binder resin and the charge transport material.
Various additives may be added to the protective layer as necessary for the purpose of improving adhesiveness, smoothness, and chemical stability.
There is no restriction | limiting in particular in the thickness of the said protective layer, According to the objective, it can select suitably, For example, 1-15 micrometers is preferable and 1-10 micrometers is more preferable.

An undercoat layer may be provided between the substrate and the photosensitive layer as necessary. The undercoat layer is provided for the purpose of improving adhesiveness, preventing moire, improving the coatability of the upper layer, and reducing residual potential.
The undercoat layer contains at least a resin and fine powder, and further contains other components as necessary.
Examples of the resin include water-soluble resins such as polyvinyl alcohol resin, casein, and sodium polyacrylate; alcohol-soluble resins such as copolymer nylon and methoxymethylated nylon; polyurethane resins, melamine resins, alkyd-melamine resins, and epoxy resins. And a curable resin that forms a three-dimensional network structure.
Examples of the fine powder include metal oxides such as titanium oxide, silica, alumina, zirconium oxide, tin oxide, and indium oxide, metal sulfides, and metal nitrides.
There is no restriction | limiting in particular about the thickness of the said undercoat layer, According to the objective, it can select suitably, 0.1-10 micrometers is preferable and 1-5 micrometers is more preferable.

In the photoreceptor, an intermediate layer may be provided on the substrate as necessary in order to improve adhesion and charge blocking properties. The intermediate layer contains a resin as a main component, and it is desirable that these resins are resins having a high solvent resistance with respect to an organic solvent in view of applying a photosensitive layer thereon with a solvent.
As the resin, the same resin as the above undercoat layer can be appropriately selected and used.

  Since the photoconductor of the present invention is fitted with the flange mounted with the ground plate of the present invention, an extremely high-accuracy photoconductor is obtained, and there is no image defect and high resolution is achieved using the photoconductor. Image formation capable of full color output is possible.

Example 1
An undercoat layer coating solution having the following composition was applied by dipping on an aluminum cylindrical substrate having an outer diameter of 60 mm, a total length of 352 mm, and a wall thickness of 0.8 mm. Next, the substrate was heated at 130 ° C. for 20 minutes and cured to form an undercoat layer having a thickness of 3.5 μm on the substrate surface.
-Composition of coating liquid for undercoat layer-
Titanium oxide: 20 parts by mass Alkyd resin: 10 parts by mass Melamine resin: 10 parts by mass Methyl ethyl ketone: 60 parts by mass Next, a coating liquid for charge generation layer having the following composition is prepared. did. The obtained coating solution was applied onto the undercoat layer by the same dipping method and dried at 135 ° C. for 20 minutes to form a charge generation layer having a thickness of 0.02 μm.

-Composition of coating solution for charge generation layer-
-Butyral resin (UCC, XYHL)-1 part by mass-Titanyl phthalocyanine-9 parts by mass-Cyclohexanone-30 parts by mass-Tetrahydrofuran (THF)-30 parts by mass

Next, a coating solution for a charge transport layer having the following composition was prepared. The obtained coating solution was applied onto the charge generation layer by the same dipping method and dried at 120 ° C. for 20 minutes to form a charge transport layer.
<Composition of coating solution for charge transport layer>
Polycarbonate resin (Teijin Ltd., Panlite K-1300) 10 parts by mass following structural charge transfer agent 10 parts by mass of the formula _{(C 6 H 5) 2 C} -CH-C _{6 H 4 -N (C 6 H} 4 -CH 3) 2
Tetrahydrofuran (THF): 80 parts by mass Finally, a flange was fitted to both ends to produce a photoconductor.

The shape of the ground plate used in this photoconductor is as follows.
・ Number of contact pieces: 2 ・ Flexible plate width: 7 mm
・ Contact width: 2mm
・ Slit width: 5mm
・ Fixed plate = Angle between flexible plates: 80 °
・ Flexible plate = angle between contact pieces: 15 °
・ Ground plate material: SUS301
・ Earth plate thickness: 0.20mm

After forming the photoconductor, the shake and straightness of the end of the photoconductor were measured. To measure the shake, KEYENC LS7030 is installed so as to be perpendicular to the straight line that connects the centers of the holding jigs at both ends with the holding jig and rotates the photosensitive member. It was.
The measurement results are shown in Table 1.
Next, each obtained photoconductor is mounted on a multi-function printer (printer / printer / fax) (Ricoh Co., Ltd., IMAGEIO NEO C 600), and a solid white, cyan halftone image, magenta halftone image, Five yellow halftone images and five black halftone images were printed, and the presence or absence of color shift and image abnormality was evaluated by visual observation. Table 2 shows the image evaluation results.

Example 2
In Example 1, the cylindrical substrate coated with the photosensitive layer was fitted with a flange equipped with the following ground plate to prepare a photoreceptor.
・ Number of contact pieces: 2 ・ Flexible plate width: 8 mm
・ Contact piece width: 3mm
・ Slit width: 5mm
-Fixed plate = Flexible plate angle: 75 °
・ Flexible plate = angle between contact pieces: 20 °
・ Ground plate material: C5210P
・ Earth plate thickness: 0.20mm
The prepared photoreceptor was evaluated using the same items as in Example 1.
The evaluation results are shown in Tables 1 and 2.

Example 3
In Example 1, the cylindrical substrate coated with the photosensitive layer was fitted with a flange equipped with the following ground plate to prepare a photosensitive member.
・ Number of contact pieces: 2 ・ Flexible plate width: 7 mm
・ Contact width: 2mm
・ Slit width: 5mm
・ Fixed plate = Angle between flexible plates: 85 °
・ Flexible plate = angle between contact pieces: 15 °
・ Ground plate material: SUS301
・ Earth plate thickness: 0.20mm
・ Punching holes in the flexible plate 4 × 5mm ²
The prepared photoreceptor was evaluated using the same items as in Example 1.
The evaluation results are shown in Tables 1 and 2.

Example 4
In Example 1, the cylindrical substrate coated with the photosensitive layer was fitted with a flange equipped with the following ground plate to prepare a photoreceptor.
・ Number of contact pieces: 2 ・ Flexible plate width: 7 mm
・ Contact width: 2mm
・ Slit width: 5mm
・ Fixed plate = Angle between flexible plates: 85 °
・ Flexible plate = angle between contact pieces: 15 °
・ Ground plate material: SUS301
・ Earth plate thickness: 0.20mm
・ Punching holes in the flexible plate 4 × 5mm ²
-The tip shape of the contact piece was the shape shown in FIG. Maximum width is 4mm, length is 3mm
The prepared photoreceptor was evaluated using the same items as in Example 1.
The evaluation results are shown in Tables 1 and 2.

Example 5
In Example 1, the cylindrical substrate coated with the photosensitive layer was fitted with a flange equipped with the following ground plate to prepare a photoreceptor.
・ Number of contact pieces: 3 ・ Flexible plate width: 7 mm
・ Contact width: 2mm
・ Slit width: 5mm
・ Ground plate material: SUS301
・ Earth plate thickness: 0.20mm
・ Fixed plate = Angle between flexible plates: 80 °
・ Flexible plate = angle between contact pieces: 15 °
The prepared photoreceptor was evaluated using the same items as in Example 1.
The evaluation results are shown in Tables 1 and 2.

Example 6
An undercoat layer, a charge generation layer, and a charge transport layer are formed on an aluminum cylindrical substrate having an outer diameter of 30 mm, an overall length of 340 mm, and a wall thickness of 0.75 mm by the method shown in Example 1, and flanges are fitted to both ends. A photoconductor was prepared.
The shape of the ground plate used in this photoconductor is as follows.
・ Number of contact pieces: 2 ・ Flexible plate width: 5 mm
・ Contact width: 2mm
・ Slit width: 4mm
・ Fixed plate = Angle between flexible plates: 80 °
・ Flexible plate = angle between contact pieces: 15 °
・ Ground plate material: SUS301
・ Earth plate thickness: 0.20mm
After forming the photoconductor, the shake and straightness of the end of the photoconductor were measured. The measurement method is in accordance with Example 1.
The evaluation results are shown in Table 1.

Next, each photoconductor obtained is mounted on a multi-function printer (printer / printer / fax machine (Ricoh Co., Ltd., IMAGEIO NEO C455)), and a solid white, cyan halftone image, magenta halftone image, yellow Five color halftone images and five black halftone images were printed, and the presence of color shift and image abnormality was evaluated by visual observation.
Table 2 shows the image evaluation results.

Example 7
An undercoat layer, a charge generation layer, and a charge transport layer are formed by the method shown in Example 1 on an aluminum cylindrical substrate having an outer diameter of 40 mm, a total length of 346 mm, and a wall thickness of 1.00 mm. The body was made.
The shape of the ground plate used in this photoconductor is as follows.
-Number of contact pieces: 2-Flexible plate width: 6 mm
・ Contact width: 2mm
・ Slit width: 5mm
・ Fixed plate = Angle between flexible plates: 80 °
・ Flexible plate = angle between contact pieces: 50 °
・ Ground plate material: C5210P
・ Ground plate thickness: 0.20mm
After forming the photoconductor, the shake and straightness of the end of the photoconductor were measured. The measurement method is in accordance with Example 1.
The evaluation results are shown in Table 1.
Next, each obtained photoconductor is mounted on a copy / printer / fax multifunction machine (Ricoh Co., Ltd., IMAGEIO MP C3000), and a solid white, cyan halftone image, magenta halftone image, yellow Five color halftone images and five black halftone images were printed, and the presence or absence of color shift and image abnormality was evaluated by visual observation.
Table 2 shows the image evaluation results.

Comparative Example 1
In Example 1, the cylindrical substrate coated with the photosensitive layer was fitted with a flange having an existing ground plate attached thereto to produce a photosensitive member.
・ Number of contact pieces: 2 ・ Flexible plate width: 4 mm
・ Slit width: 5mm
・ Fixed plate = Angle between flexible plates: 80 °
・ Ground plate material: SUS301
・ Earth plate thickness: 0.20mm
The prepared photoreceptor was evaluated using the same items as in Example 1.
The evaluation results are shown in Tables 1 and 2.

As described above, according to the present invention, when the flange is fitted to the cylindrical base body, the ground plate can contact with an appropriate force without pressing the inner wall of the cylindrical base body. Therefore, the deformation of the end portion of the photoconductor after the flange fitting, which has occurred in the conventional ground plate, does not occur, and a high-precision electrophotographic photoconductor substrate can be manufactured.
Therefore, the electrophotographic photosensitive member of the present invention can provide an electrophotographic photosensitive member with small shake and good roundness accuracy, and by using this electrophotographic photosensitive member, an image forming system without color misregistration can be provided. .

Overall view of electrophotographic photosensitive member provided with the ground plate of the present invention Earth plate Flange with ground plate The state before the flange is fitted to the electrophotographic photosensitive member The flange has been fitted to the electrophotographic photosensitive member. Example of ground plate Example of ground plate: Tip shape of contact piece The shape of the end of the cylindrical base when the conventional ground plate shape and the flange with the ground plate are fitted The shape of the end of the cylindrical base when the flange with this ground plate is fitted

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Ground plate 2 ... Fixing plate 6 ... Cylindrical base | substrate 7 ... Flange 11 ... Mounting hole 12 ... Slit part

Claims (6)

A ground plate having a cylindrical body having an opening in at least one, a flange fitted to the opening of the cylindrical body, and a contact piece fixed to the flange and abutting against the inner surface of the cylindrical body when the flange is fitted In the ground plate, the ground plate is fixed to the fitting side surface of the flange and has a conductive plate engaging with the ground side, and is bent from the outer edge of the fixed plate, A flexible plate that extends along the axial direction of the body and is housed entirely inside the notch provided on the fitting side of the flange, and from the extended end of the flexible plate toward the inner surface of the cylindrical body The contact piece is bent from the notch provided on the fitting side of the flange, and at least the tip of the contact piece protrudes outside, and the width of the contact piece: L1 Width of flexible plate: L With the flange fitting side provided with cut-out of width: relationship L3 has the following relationship,
L2 <L3 <L1
An earth plate, wherein an intersection angle between the fixed plate and the flexible plate is less than 90 deg, and an intersection angle between the flexible plate and the contact piece is less than 50 deg. 2. The ground plate according to claim 1, wherein the length of the contact piece is shorter than the length of the slit. 2. The ground plate according to claim 1, wherein there are at least two contact pieces. A cylindrical body having an opening on at least one side, a flange fitted to the opening of the cylindrical body, and a ground plate having a contact piece fixed to the flange and abutting against the inner surface of the cylindrical body when the flange is fitted The force F1 that the contact piece of the ground plate vertically applies to the wall of the cylindrical body is the minimum for deforming the cylindrical body when a force is applied vertically from the outer surface of the cylindrical body. An earth plate characterized by being smaller than force F2. A photoconductor fitted with a flange having the ground plate structure according to claim 1. An image forming system using a photosensitive member fitted with a flange having a ground plate structure according to claim 1.

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