JP3758404B2 - Sound prevention member for electrophotographic photosensitive drum - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sounding prevention member that is inserted into a photosensitive member in order to prevent charging noise and vibration noise of the photosensitive drum.
[0002]
[Prior art]
To increase the rigidity and strength of the cylinder inside the thin hollow cylindrical photoconductor to prevent the charging noise of the charging device used in image forming apparatuses such as electrophotographic devices and vibration noise with the cleaner blade. An anti-vibration member is inserted.
Regarding the above-mentioned vibration isolating member, JP-A-5-188838 discloses a method of encapsulating a curing agent due to chemical change in a cylindrical hollow body, JP-A-5-18839 discloses a method of encapsulating an elastic body having a certain hardness, No. 142922 discloses a method of bringing a metal elastic body into close contact.
[0003]
[Problems to be solved by the invention]
However, in the method disclosed in Japanese Patent Laid-Open No. 5-1888838, the method of encapsulating a predetermined amount of the curing agent is complicated and causes an increase in the process burden, and in the methods represented by the other two publications, the cost of the member itself is high. There was a problem to say.
Further, although a vibration isolating member as shown in FIG. 6 is known, there is a problem that molding is difficult and manufacturing cost is high (refer to Japanese Patent Laid-Open No. 8-54804).
[0004]
[Means for Solving the Problems]
The present invention relates to an electrophotographic photosensitive drum in which a photosensitive layer is formed on the outer peripheral surface of a cylindrical substrate, and the sound preventing member is mounted on the inner peripheral surface of the substrate. The body is composed of an upper sandwich plate having a projecting portion made of an elastic body , and a lower sandwich plate having a fitting portion that can be fitted to a half part of a column or a hollow cylinder up to a middle portion of the projecting portion. The present invention provides a sound-preventing member for an electrophotographic photosensitive drum, which can be brought into close contact with the inner peripheral surface of a substrate.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1C, the sound preventing member of the present invention is attached to the inner peripheral surface 8 of the electrophotographic photosensitive drum in which the photosensitive layer is formed on the outer peripheral surface of the cylindrical substrate.
The photosensitive layer is laminated on a conductive support, but the substrate is not particularly limited, and examples thereof include the following.
A metal material such as aluminum, stainless steel, copper, nickel, zinc, indium, gold, silver, or a surface provided with a conductive layer such as aluminum, copper, palladium, tin oxide, indium oxide or a conductive polymer, Polymers such as polyester, insulating substrates such as paper or glass, and the surface of the conductive support can be subjected to various treatments within a range that does not affect the image quality. For example, surface oxidation treatment or chemical treatment can be performed. This corresponds to a metal drum that has been subjected to metal oxidation treatment by electrode oxidation or the like. The shape can be any shape such as a drum, a sheet, a belt, and a seamless belt.
[0006]
The photosensitive layer is not particularly limited, but may be a single layer type including a charge generation layer and a charge transport layer, or a function separation type in which the charge generation layer and the charge transport layer are laminated. May be.
As the charge generating agent used in the charge generating layer, any known charge generating agent can be used, and is not particularly limited, but examples thereof include the following.
Selenium and its alloys, arsenic-selenium, cadmium sulfide, zinc oxide, cadmium sulfide, zinc oxide, antimony sulfide, alloys such as CdS-Se, oxide-based semiconductors such as titanium oxide, silicon-based materials such as amorphous silicon, etc. Various organic pigments such as inorganic photoconductive substances, phthalocyanines, azo dyes, quinacridones, polycyclic quinones, pyrylium salts, perylenes, indigo, thioindigo, anthanthrone, pyranthrone, cyanine, and the like can be used. Of these, organic pigments are preferred, and metals such as metal-free phthalocyanine, copper, indium chloride, gallium chloride, silicon, tin, oxytitanium, zinc, vanadium, or phthalocyanines coordinated with these oxides, chlorides, and hydroxides are particularly preferred. Alternatively, azo pigments such as monoazo, bisazo, trisazo and polyazo are desirable. These charge generating agents can be used alone or in combination of two or more.
[0007]
If the charge generating layer has poor film forming ability of the charge transfer agent, it may be formed using a binder resin. In this case, the charge generation layer can be obtained by coating and drying a coating solution obtained by dissolving or dispersing these substances and a binder resin in a solvent.
Examples of the binder include polymers and copolymers of vinyl compounds such as butadiene, styrene, vinyl acetate, vinyl chloride, acrylic acid ester, methacrylic acid ester, vinyl alcohol, and ethyl vinyl ether, polyvinyl butyral, polyvinyl formal, and partially modified polyvinyl acetal. , Polycarbonate, polyester, polyamide, polyurethane, cellulose ether, phenoxy resin, silicon resin, epoxy resin, poly-N-vinylcarbazole resin, and the like. These can also be used by crosslinking with heat, light or the like using an appropriate curing agent or the like. These binder resins can be used alone or in combination of two or more.
[0008]
Solvents and dispersion media used in the application of the charge generation layer include butylamine, diethylamine, ethylenediamine, isopropanolamine, triethanolamine, triethylenediamine, N, N-dimethylformamide, acetone, methyl ethyl ketone, cyclohexanone, benzene, toluene , Xylene, chloroform, 1,2-dichloroethane, 1,2-dichloropropane, 1,1,2-trichloroethane, 1,1,1-trichloroethane, trichloroethylene, tetrachloroethane, dichloromethane, tetrahydrofuran, dioxane, Examples thereof include methyl alcohol, ethyl alcohol, isopropyl alcohol, ethyl acetate, butyl acetate, dimethyl sulfoxide, and methyl cellosolve.
[0009]
These solvents may be used alone or in combination of two or more.
In the case of the charge generating agent and the binder resin in the charge generating layer, there is no particular limitation, but generally 5 to 500 parts by weight, preferably 20 to 300 parts by weight of the binder polymer is added to 100 parts by weight of the charge generating agent. use.
[0010]
The charge generator is usually dispersed and dissolved in an appropriate dispersion medium using a ball mill, ultrasonic disperser, paint shaker, attritor, sand grinder, etc., and if necessary, a binder resin is added to adjust the coating liquid, and this coating is performed. The liquid is applied by a coating method such as a dipping method, a spray method, a bar coater method, a blade method, a roll coater method, a wire bar coating method, or a knife coater coating method, and then dried. The charge generation layer may be formed by depositing the charge generation agent by a vapor deposition method such as vapor deposition or sputtering. The thickness of the charge generation layer is 0.01 to 5 μm, preferably 0.05 to 2 μm.
[0011]
The intermediate layer needs to be a layer that is not dissolved by the coating solution for the charge transport layer, which will be described later. Therefore, a curable resin is preferably used as the binder resin.
As the curable resin used in the intermediate layer, a curable resin that undergoes polymerization or crosslinking by heat, light, radiation, or the like is used. By using a curable resin in the intermediate layer and forming a strong network structure, it becomes possible to form a film without penetration of low molecular compounds such as charge transport agents used in the next step into the intermediate layer. .
[0012]
Examples of such curable resins include urethane resins, unsaturated polyester resins, epoxy resins, thermosetting acrylic resins, alkyd resins, silicone resins, melamine resins, thermosetting phenol resins, phenoxy resins, and thermosetting fluororesins. Silicone alkyd resin, phenol formaldehyde resin, styrene-alkyd resin, urea resin, and polyimide resin are used. Photo curable resins are also possible, such as unsaturated polyester, acrylic resin, acrylated alkyd resin, polyester acrylate, polyether acrylate, acrylated epoxy resin, acrylated polyurethane, acrylated spirane resin, acrylated silicon Resins, polythiol resins, cationic polymerization type epoxy resins, and the like are conceivable.
[0013]
Preferably, at least one resin selected from unsaturated polyester resins, epoxy resins, melamine resins, urethane resins, curable fluororesins, acrylic resins, and photocurable resins is used.
Charge generation agent fine particles and / or charge transfer agent fine particles are dispersed in the intermediate layer.
As such charge generation agent fine particles, the same charge generation agent as that used in the charge generation layer is used. That is, selenium and its alloys, arsenic-selenium, cadmium sulfide, zinc oxide, cadmium sulfide, zinc sulfide, antimony sulfide, alloys such as CdS-Se, oxide-based semiconductors such as titanium oxide, silicon-based materials such as amorphous silicon, Other inorganic photoconductive substances, phthalocyanines, azo dyes, quinacridones, polycyclic quinones, bililium salts, perylene, indigo, thioindigo, anthanthrone, pyranthrone, cyanine, and other various organic pigments and dyes can be used. Metal-free phthalocyanine, copper, indium chloride, gallium chloride, silicon, tin, oxytitanium, zinc, vanadium and other metals or oxides, chlorides, hydroxide coordinated phthalocyanines, or monoazo, bisazo, trisazo, An azo pigment such as polyazo is desirable.
[0014]
Examples of the charge transporting agent fine particles include polymer compounds such as polyvinylcarbazole, polyvinylpyrene, polyacenaphthylene, polyvinylpyrene, and polyvinylanthracene, or various pyrazoline derivatives, carbazole derivatives, oxazole derivatives, hydrazone derivatives, stilbene derivatives, arylamine derivatives, oxalates. Fine particles such as diazole derivatives, thiazole derivatives, thiadiazole derivatives, triazole derivatives, imidazole derivatives, imidazolone derivatives, imidazolidine derivatives, styryl compounds, benzothiazole derivatives, benzimidazoles, acridine derivatives, and phenazine derivatives can be used. In addition to the above hole transporting type charge transporting agent, electron transporting agent fine particles such as a benzoquinone derivative, a naphthoquinone derivative, an anthraquinone derivative, a diphenoquinone derivative, a fluorenone derivative and the like are also used as necessary.
[0015]
These fine particles can be used alone or in combination of two or more, and phthalocyanines, azo pigments, and polycyclic aromatic pigments are preferable.
These fine particles preferably have an average particle size of 1 μm or less.
The mixing ratio of these particles to the binder resin is 5 to 150 parts by weight with respect to 100 parts by weight of the binder resin, preferably 10 to 100 parts by weight, and more preferably 20 to 60 parts by weight. The film thickness of the intermediate layer is in the range of 0.1 to 20 μm, preferably 1 to 10 μm.
[0016]
The transmittance of the intermediate layer is 10% or more with respect to the exposure wavelength used in the electrophotographic apparatus to be used, and preferably 20% or more.
The charge transport agent contained in the charge transport layer is not particularly limited, but is a polymer compound such as polyvinyl carbazole, polyvinyl pyrene, polyacenaphthylene, polyvinyl pyrene, polyvinyl anthracene, or various pyrazoline derivatives, carbazole. Derivatives, oxazole derivatives, hydrazone derivatives, stilbene derivatives, arylamine derivatives, oxadiazole derivatives, thiazole derivatives, thiadiazole derivatives, triazole derivatives, imidazole derivatives, imidazolone derivatives, imidazolidine derivatives, styryl compounds, benzothiazole derivatives, benzimidazole derivatives, Low molecular weight compounds such as acridine derivatives and phenazine derivatives can be used. In addition to the above hole transporting type charge transporting agents, electron transporting agents such as benzoquinone derivatives, naphthoquinone derivatives, anthraquinone derivatives, diphenoquinone derivatives, fluorenone derivatives and the like are also used as necessary. These charge transport agents are used alone or in combination of two or more in consideration of the combination with the charge generator, polarity and the like.
[0017]
When the film forming ability of the charge transfer agent is poor, it may be formed using a binder resin. In this case, the charge transport layer can be obtained by coating and drying a coating solution obtained by dissolving or dispersing these substances and a binder resin in a solvent. The binder resin and the solvent are the same as those used in the charge generation layer, and can be produced using the same coating method.
In the charge transport layer, the ratio of the charge transport agent and the binder resin is not particularly limited, but generally 10 to 500 parts by weight, preferably 30 to 300 parts by weight of the binder resin is used with respect to 100 parts by weight of the charge transport agent. To do. The thickness of the charge transport layer is usually 5 μm to 50 μm, preferably 10 μm to 40 μm.
[0018]
If necessary, an electron-withdrawing compound, or other pigments, dispersants, surfactants, and other additives may be added to the photosensitive layer.
Examples of electron-withdrawing compounds include tetracyanoquinodimethane, dicyanoquinomethane, cyano compounds such as aromatic esters having a dicyanoquinovinyl group; nitro compounds such as 2,4,6-trinitrofluorenone; condensation of perylene, etc. Polycyclic aromatic compounds; diphenoquinone derivatives; quinones; aldehydes; ketones; esters; acid anhydrides; phthalides; metal complexes of substituted and unsubstituted salicylic acid; metal salts of substituted and unsubstituted salicylic acid; Metal complexes of acids; metal salts of aromatic carboxylic acids. Preferably, a cyano compound, a nitro compound, a condensed polycyclic aromatic compound, a diphenoquinone derivative, a metal complex of a substituted and unsubstituted salicylic acid, a metal salt of a substituted and unsubstituted salicylic acid; a metal complex of an aromatic carboxylic acid; A metal salt is preferably used.
[0019]
Further, the photosensitive layer of the electrophotographic photosensitive member of the present invention has a well-known plasticizer, antioxidant, ultraviolet absorption for improving the film forming property, flexibility, coating property, mechanical strength, film forming property, durability and the like. An agent and a leveling agent may be contained.
It goes without saying that the present photoreceptor may have other layers such as an undercoat layer and a surface protective layer as required.
The undercoat layer is usually used between the photosensitive layer and the conductive support, and a commonly used known layer can be used. As the undercoat layer, inorganic fine particles such as titanium oxide, aluminum oxide, zirconia, silicon oxide, organic fine particles, polyamide resin, phenol resin, melamine resin, casein, polyurethane resin, epoxy resin, cellulose, nitrocellulose, polyvinyl alcohol, polyvinyl butyral Ingredients such as resins can be used. These fine particles and resins can be used alone or in admixture of two or more. The thickness is usually 0.01 to 50 μm, preferably 0.01 to 10 μm. A known blocking layer may be provided between the photosensitive layer and the conductive support.
[0020]
When a surface protective layer is provided on the photoreceptor, the thickness of the protective layer can be 0.01 to 20 μm, preferably 0.1 to 10 μm. The above binder can be used for the protective layer, but it may contain the above-mentioned charge generating agent, charge transporting agent, additive, conductive material such as metal or metal oxide, lubricant and the like.
The electrophotographic photoreceptor thus obtained is suitable for the electrophotographic field such as a copying machine, a printer, a fax machine, and a plate making machine.
[0021]
As a material for the anti-squealing agent, a synthetic resin is preferable from the viewpoint of easy molding, etc., but in order to secure weight and ensure the rigidity of the member, the synthetic resin is heavier than the synthetic resin. More preferable than dispersed.
Although it does not specifically limit as a synthetic resin, For example, the following are mentioned.
[0022]
The member heavier than the synthetic resin dispersed in the synthetic resin is not particularly limited, and examples thereof include the following.
Metals such as phosphor bronze, copper, iron, aluminum and their compound ceramics.
[0023]
The ringing prevention member of the present invention can be brought into close contact with the electrophotographic photosensitive drum by temporarily contracting the ringing prevention member by applying pressure or the like from the outside and then expanding it in the electrophotographic photosensitive drum. If it is a thing, it will not specifically limit.
[0024]
The length 10 of the anti-squealing agent is not particularly limited as long as it can be in close contact with the photosensitive drum and prevent the charging noise and vibration noise of the photosensitive drum, but with respect to the length 9 of the photosensitive drum. 0.2 to 1 is preferable, and in consideration of inserting flanges at both ends of the drum when the photosensitive drum is actually used, about 0.2 to about 0.9 is more preferable. From the viewpoint of preventing the above, about 0.6 to 0.9 is preferable. Two or more ringing prevention members may be inserted into the photosensitive drum.
[0025]
Examples of the present invention will be shown below, but the present invention is not limited to these examples as long as the gist thereof is not exceeded.
Reference Example 1 FIG. 1 (a) is a perspective view of a ringing prevention member for an electrophotographic photosensitive drum with elastic bodies 3 sandwiched between cylindrical halves 1 and 2. FIG. After the elastic member 3 is contracted, for example, pressure is applied to the halves 1 and 2 in the directions 4 and 5 to contract the ringing prevention member (FIG. 1 (b)) and after insertion into the electrophotographic photosensitive drum. Then, by releasing the pressure and expanding the sounding prevention member, the sounding prevention member is brought into close contact with the electrophotographic photosensitive drum (FIG. 1C). Although it does not specifically limit as an elastic body, For example, the following are mentioned. Synthetic resins such as polyamide, polycarbonate, polyphenylene ether, ABS resin, polyacetal and polyphenylene sulfide are used. Further, in order to improve the physical properties of synthetic resins, two or more of these resins may be used in combination, and may be used in combination with other materials as long as the properties are not impaired. In this case, the reinforcing fiber and the bead-like reinforcing material that can be used in combination with a resin containing a reinforcing fiber such as glass fiber, carbon fiber, and alumina fiber or a bead-like reinforcing material may be used alone or in combination of two or more. Reinforcing fibers mainly composed of glass fibers are advantageous in terms of cost.
[0026]
(Example 2)
Further, FIG. 2 shows an upper sandwich plate having a projection 13 in a cylindrical half 11 and a lower sandwich plate 14 having a fitting portion 14 that can be fitted to a half of the projection 13 in a half of a cylinder 12. 2 is a perspective view of a sound-preventing material for an electrophotographic photosensitive drum comprising:
The protrusions are partly fitted in the lower sandwich plate, but the ringing prevention member is shrunk by inserting pressure into the part that is not in the lower sandwich plate and inserted into the electrophotographic photosensitive drum, and then the pressure is released. By expanding the ringing prevention member, the ringing prevention member is brought into close contact with the electrophotographic photosensitive drum.
The shape of the protrusion is not particularly limited, and examples thereof include a quadrangular prism shape, a cylindrical shape, and an elliptical column shape. On the other hand, the shape of the fitting portion is not particularly limited as long as it can fit the projection partway, but a shape that can fit 5% to 95% of the volume of the projection part is preferable, From the viewpoint of the elastic surface and strength, those that can fit 30% to 70% are preferable.
The number of protrusions and insertion parts is not particularly limited, but a sounding prevention member having two or more protrusions and insertion parts is preferable from the viewpoint of elasticity and stability, and is easy to manufacture. From the viewpoint, 2 to 100 are preferable.
[0027]
(Example 3)
3 (a) and 3 (b), an upper sandwiching plate having a projection 17 on a cylindrical half 15 and a fitting portion 18 that can be fitted to a half of the projection 17 on a cylindrical half 16. FIG. FIG. 2 is a perspective view of a sound-preventing material for an electrophotographic photosensitive drum that includes a lower sandwiching plate having
After combining to form a sounding prevention member (FIGS. 3C and 3D), the sounding prevention member is contracted by bringing the rims 19 and 20 of the respective halves closer (FIG. 3E). ) After inserting into the electrophotographic photosensitive drum, the pressure is released and the sound preventing member is expanded to bring the sound preventing member into close contact with the electrophotographic photosensitive drum. As described above, it is preferable that the protrusion and the insertion portion are not in the center of the halved body because it is easy to contract the ringing prevention member.
The shape of the protrusion is not particularly limited, and examples thereof include a quadrangular prism shape, a cylindrical shape, and an elliptical column shape. On the other hand, the shape of the fitting portion is not particularly limited as long as it can fit the projection partway, but a shape that can fit 5% to 95% of the volume of the projection part is preferable, From the viewpoint of the elastic surface and strength, those that can fit 30% to 70% are preferable.
The number of protrusions and insertion parts is not particularly limited, but a sounding prevention member having two or more protrusions and insertion parts is preferable from the viewpoint of elasticity and stability, and is easy to manufacture. From the viewpoint, 2 to 100 are preferable.
The cylindrical half may be a cylindrical half.
[0028]
(Example 4)
4 (a) and 4 (b) are perspective views of a ringing prevention member for an electrophotographic photosensitive drum comprising a cylindrical half member 21 and 24, and an upper sandwiching plate and a lower sandwiching plate each having a protrusion and a fitting portion, respectively. It is. Each of these forms a sound-preventing member for an electrophotographic photosensitive drum by combining two of those shown in FIGS. 4 (a) and 4 (b). The ring preventing member in which the upper sandwich plate and the lower sandwich plate have the same shape as described above is particularly preferable from the viewpoint of manufacturing cost.
The shape of the protrusion is not particularly limited, and examples thereof include a quadrangular prism shape, a cylindrical shape, and an elliptical column shape. On the other hand, the shape of the fitting portion is not particularly limited as long as it can fit the projection partway, but a shape that can fit 5% to 95% of the volume of the projection part is preferable, From the viewpoint of the elastic surface and strength, those that can fit 30% to 70% are preferable.
The number of protrusions and insertion parts is not particularly limited, but a sounding prevention member having two or more protrusions and insertion parts is preferable from the viewpoint of elasticity and stability, and is easy to manufacture. From the viewpoint, 2 to 100 are preferable.
[0029]
(Example 5)
FIG. 5 shows an anti-ringing member for an electrophotographic photosensitive drum comprising a cylindrical half 27, an upper sandwiching plate and a lower sandwiching plate each having a protruding portion 28 and a fitting portion 29, and a rib 30 existing in a groove portion of the cylinder. It is a perspective view. Having a rib structure is preferable from the viewpoint of securing the weight of the ringing prevention member.
By combining the two shown in FIG. 5, a sound preventing member for an electrophotographic photosensitive drum is formed. The ring preventing member in which the upper sandwich plate and the lower sandwich plate have the same shape as described above is particularly preferable from the viewpoint of manufacturing cost.
The shape of the protrusion is not particularly limited, and examples thereof include a quadrangular prism shape, a cylindrical shape, and an elliptical column shape. On the other hand, the shape of the fitting portion is not particularly limited as long as it can fit the projection partway, but a shape that can fit 5% to 95% of the volume of the projection part is preferable, From the viewpoint of the elastic surface and strength, those that can fit 30% to 70% are preferable.
The number of protrusions and insertion parts is not particularly limited, but a sounding prevention member having two or more protrusions and insertion parts is preferable from the viewpoint of elasticity and stability, and is easy to manufacture. From the viewpoint, 2 to 100 are preferable.
The rib is not particularly limited as long as it does not hinder the function. For example, the rib is made of the same synthetic resin as the half of the cylinder and can be manufactured simultaneously as an upper sandwich plate or a lower sandwich plate. It is preferable.
[Brief description of the drawings]
FIG. 1 is a perspective view (ac) of a sounding prevention member for an electrophotographic photosensitive member according to a reference example .
FIG. 2 is a perspective view of a sound preventing member for an electrophotographic photosensitive member according to the present invention.
FIG. 3 is a perspective view (ac, e) and a front view (d) of a sounding prevention member for an electrophotographic photosensitive member according to the present invention.
FIG. 4 is a perspective view of a sounding prevention member for an electrophotographic photosensitive member according to the present invention.
FIG. 5 is a perspective view of a sound preventing member for an electrophotographic photosensitive member according to the present invention.
FIG. 6 is a perspective view of a sounding prevention member for an electrophotographic photosensitive member according to the present invention.

Claims (6)

 In the electrophotographic photosensitive drum in which the photosensitive layer (7) is formed on the outer peripheral surface of the cylindrical substrate (6) and the sound preventing member is mounted on the inner peripheral surface (8) of the substrate, the sound preventing member is elastic. A cylinder or cylinder half (11) having a protrusion (13) made of a body and a cylinder or cylinder half having a fitting part (14) that can be fitted to the middle of the protrusion (13). (12), wherein the two halves (11), (12) form a columnar shape or a cylindrical shape and can be brought into close contact with the inner peripheral surface (8) of the cylindrical base. A sound-preventing member for an electrophotographic photosensitive drum.  The sound preventing member for an electrophotographic photosensitive drum according to claim 1, wherein each of the two halves has one or more protrusions and / or insertion portions.  3. The ringing prevention member for an electrophotographic photosensitive drum according to claim 1, wherein the half of the cylinder has one or more rib structures. The sound preventing member for an electrophotographic photosensitive drum according to claim 1, wherein the two halves have the same shape.  The sound preventing member for an electrophotographic photosensitive drum according to claim 1, wherein the sound preventing member is made of a synthetic resin.  6. The sound-preventing member for an electrophotographic photosensitive drum according to claim 1, comprising a sound-preventing member configured by dispersing a member heavier than the synthetic resin in a synthetic resin.

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