JP3253585B2 - Electrostatic latent image carrier and image forming apparatus using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a plain paper copy (PPC), a laser beam printer (LBP),
The present invention relates to an electrostatic latent image carrier used in an electrophotographic process, such as plain paper fax (PPF) and multifunction peripheral (MPF), and an image forming apparatus using the same. It relates to the improvement of the rotational runout accuracy of the body.

[0002]

2. Description of the Related Art An image forming apparatus utilizing an electrophotographic method is generally used for the above-mentioned various uses, and uses an electrostatic latent image carrier having a photosensitive layer provided on a conductive drum. The image formation is performed through various steps such as charging, exposure, development and transfer.

It is widely known that the outer peripheral surface of a conductive drum substrate is cut to make its outer diameter equal over its entire length. For example, Japanese Patent Application Laid-Open No. 7-210029 discloses that the outer diameter at both ends is set to be equal to the outer diameter in the axial direction. A photoconductor cylinder is formed of a cylindrical photoconductor substrate that is gradually reduced in direction, and a photoconductive layer having a uniform thickness provided on the outer periphery of the photoconductor substrate. Within both ends of the photoconductor cylinder,
A photosensitive drum for an electrophotographic apparatus is described, in which flanges are press-fitted inwardly from the outside in the axial direction, and the outer diameter of the photosensitive drum is made equal over its entire length.
In order to manufacture a cylindrical photoreceptor base in which the outer diameters of both ends are gradually reduced outward in the axial direction, holding each of the cylindrical photoreceptor bases having conical outer surfaces inward from the outside in the axial direction at both ends. By inserting the holder, the outer diameters of both ends thereof are gradually increased outward in the axial direction, and the outer peripheral surface of the photoreceptor substrate is turned while rotating the holder about the axis of the holder. Has been described.

[0004]

In the above-mentioned prior art electrostatic latent image carrier holding mechanism, since the components are fitted, the eccentricity tolerance of the following components, that is, the inner diameter and the outer diameter of the drum, is determined. Eccentricity tolerance All the eccentricity tolerances of the flange and the penetrating shaft are accumulated, resulting in the final eccentricity of the drum. When such an eccentricity occurs, the drum peripheral speed decreases when the distance between the shaft and the drum surface decreases, and conversely, the drum peripheral speed increases when the distance between the shaft and the drum surface decreases,
The temporal distribution of the drum peripheral speed becomes a sine curve, and the deviation of the drum peripheral speed reaches ± ω · d (ω: angular velocity, d: distance between the center of the drum and the eccentric shaft) at the maximum. In response to the deviation of the peripheral speed, an enlarged portion and a reduced portion are periodically generated in the transferred image, and it is difficult to form an accurate image.

The effect on image quality due to the eccentricity of an electrostatic latent image carrier such as a photosensitive drum is particularly remarkable in full-color image formation. For example, in a tandem-type full-color printer, photoconductor units for cyan, magenta, yellow, and black are arranged along a transfer paper transport path,
Each color toner on the surface of the photoreceptor is written on the transfer paper. However, in the photoreceptor drum holding mechanism according to the prior art 1, the eccentricity of the drum is relatively large, the peripheral speed of the drum becomes uneven, and an image having a color shift is formed. Will be. This color shift is easily recognized even if it is a slight shift, and may be recognized even if the shift is about 80 μm.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electrostatic latent image carrier capable of eliminating the occurrence of rotational shake due to eccentricity and enabling accurate image formation. Another object of the present invention is to
An object of the present invention is to provide an electrostatic latent image carrier that can be mounted on a tandem-type full-color printer to form a full-color image without causing color shift.

According to the present invention, a hollow cylindrical metal or metal
An electrostatic latent image bearing member having a photosensitive layer on the outer surface of the gold substrate, the gold genus or form of the outer surface of the alloy substrate, the image
A flange with a center of rotation under the conditions used for forming equipment
Attach to both open ends of the metal or alloy substrate, then
An electrostatic latent image carrier is provided, which is cut by rotation about the rotation center . In the present invention, 1. 1. the photosensitive layer is formed of an organic material ; Row photosensitive layer formed by a blade coating after the cutting
That it is rope, 3. 3. A cap is fitted on at least one end of the cut substrate, and a photosensitive layer is formed by a dip coating method . In an image forming apparatus using a plurality of electrostatic latent image carriers, it is preferable to use the electrostatic latent image carrier.

The present invention relates to a hollow cylindrical metal or alloy base.
Although the present invention relates to an electrostatic latent image carrier having a photosensitive layer on the outer surface of the body, the formation of the outer surface of a metal substrate of the electrostatic latent image carrier is
It is characterized in that the electrostatic latent image carrier is rotated by a rotation center under a condition used in an image forming apparatus.

As shown in FIG. 1, the most typical electrostatic latent image carrier is a cylindrical substrate (drum) 101, flanges 102 attached to both open ends of the substrate, and provided on the surface of the substrate. Of the photosensitive layer 103. A through hole 104 is provided at the center of the flange 102, and a shaft 105 serving as a rotation center is provided in the through hole 104 so as not to rotate with each other.

In a conventional electrostatic latent image carrier, as shown in FIG. 2 (prior art), a cylindrical base (base tube) 101a is held by a chuck or the like (not shown), and the surface thereof is tool (bite). The surface is formed by cutting with 106 (step A),
Next, the photosensitive layer 103 is formed on the surface of the substrate by coating the photosensitive member composition with a coating tool 107 (blade) (Step B), and the flanges 102 separately formed on both ends of the cylindrical substrate 101 on which the photosensitive layer is formed are formed. The fitting is performed (step C), and the shaft 105 is attached to use as an electrostatic latent image carrier.
In this case, as already pointed out, the eccentricity tolerance of the inner diameter and the outer diameter of the drum and the eccentricity tolerance of the flange and the through shaft are all accumulated, and the deflection of the drum reaches a level of 30 to 80 μm.

In the electrostatic latent image carrier of the present invention, as shown in FIG. 3, a flange 102 is attached to a cylindrical base (base tube) 101a.
, The shaft 105 is attached, and the surface is formed by cutting the surface with the tool 106 under the rotation about the center of rotation in a situation where the electrostatic latent image carrier is used in the image forming apparatus (step A), and then the coating is performed. The photosensitive layer 103 is formed on the surface of the substrate by coating the photosensitive member composition with a tool 107 (blade) (step B).

That is, in this electrostatic latent image carrier, a unique flange 102 is formed with respect to a unique cylindrical substrate 101a.
From the time of surface cutting to the time of use as an electrostatic latent image carrier, it is always fitted. The center of rotation at the time of cutting and the center of rotation at the time of use are fit between the through hole 104 and the shaft 105. The values almost coincide with each other in the range excluding the clearance, so that the accuracy of shake of the electrostatic latent image carrier is remarkably improved, and accurate image formation can be performed.

In FIG. 4 schematically showing a device for measuring the deflection accuracy of the electrostatic latent image carrier, bearings 111, 111 for supporting a shaft 105 of the electrostatic latent image carrier 110 are arranged. Is connected to a drive motor 112. A laser light emitting element 113 is provided on one side and a light receiving element 114 is provided on the other side with the electrostatic latent image carrier 110 interposed therebetween.
Are arranged, and these elements are connected to a shake measurement computer 117 by connections 115 and 116.
The shake of the electrostatic latent image carrier is photoelectrically detected.

The deflection of the electrostatic latent image carrier 110 may be generally detected in the form of a sine curve shown in FIG. This shake is represented by the height (H) of the peaks and valleys of the curve in FIG. According to the present invention, the center of rotation at the time of cutting and the center of rotation at the time of use can be substantially matched within a range excluding the clearance between the through hole 104 and the shaft 105. Runout (H) is 20 μm or less, especially 10 μm
In the following, it is possible to further suppress the thickness to 7 μm or less.

[0015]

[Embodiment] [Electrostatic latent image carrier] The substrate 101a on which the photosensitive layer is provided has conductivity.
Metal or alloy, for example, aluminum, copper, tin, platinum,
A hollow cylindrical substrate made of gold, silver, vanadium, molybdenum, chromium, cadmium, titanium, nickel, indium, stainless steel, brass or the like is used. This substrate
Is hollow, so it is economical and lightweight.
Have . Generally, a hollow cylindrical raw tube formed by drawing or extruding aluminum or an aluminum alloy is preferable in terms of availability and processing.

On the other hand, the flange 102 used for the cylindrical substrate is also made of the above-mentioned metal or plastic for machine parts, for example, polyoxymethylene resin, or the like.
What consists of nylon resin etc. is used. From the standpoint of runout accuracy, a metallic one such as aluminum die casting is suitable.

The flange 102 generally has an outer peripheral portion for supporting a cylindrical substrate and a central through-hole 104. One flange and the other flange are arranged with respect to the shaft 105 with respect to a shaft 105-8732. May have an engagement structure as described in Japanese Unexamined Patent Publication (Kokai) No. H11-15095.

According to the present invention, as shown in FIG. 3, the flanges 102, 102 are press-fitted into the cylindrical base 101a,
The cutting tool 106 is rotated about the center of the through hole 104 of the flange 102 as a rotation center, and the cutting tool 106 is rotated.
The surface is formed by a cutting process while meshing with a. In order to hold and rotate the center of the through hole as the center of rotation, the shaft 105 is inserted into the through hole of the flange, the cylindrical base is supported by this shaft, and cutting by rotation can be performed. Alternatively, the through-hole portion may be held by a chuck of a cutting machine, and cutting by rotation may be performed.
It should be noted that a known cutting machine tool such as an NC lathe can be used for the cutting.

As an example, the thickness of the cylindrical substrate is 0.6 m.
m or more, preferably 1.0 mm or more and 5.5 mm or less, while the cutting allowance is 0.05 mm based on the diameter.
Above, preferably 0.2 mm or more. When the thickness of the cylindrical substrate is smaller than the above range, the deflection due to the centrifugal force at the center in the longitudinal direction of the cylindrical body tends to increase, while when the thickness is larger than the above range, the weight of the substrate increases. This increases the weight of the image forming apparatus and increases the driving force, which is not preferable. If the cutting allowance is smaller than the above range, it is difficult to perform cutting to sufficiently improve run-out accuracy.

The formation of the surface of the cylindrical substrate improves the adhesion of the photosensitive layer provided after the cutting, and prevents the generation of interference light when using laser light for image exposure, and furthermore, does not cause deterioration in image quality. It is performed so as to have a surface roughness. Generally, JIS
The arithmetic average roughness (Ra) defined by B0601 (surface roughness) is 0.1 to 0.5 μm, and the maximum height roughness (R)
y) is 0.4 to 2.0 μm and ten-point average roughness (Rz)
Is preferably in the range of 0.3 to 1.9 μm.
When the roughness is less than the above range, the adhesion of the photosensitive layer tends to decrease, and interference light tends to be generated during image exposure. On the other hand, when the roughness exceeds the above range, the image quality tends to decrease significantly.

In the present invention, the photosensitive layer provided on the surface-formed cylindrical substrate may be arbitrary, and may be a photosensitive layer conventionally used in electrophotography, for example, a selenium photosensitive layer, an amorphous silicon photosensitive layer, A zinc oxide photosensitive layer, a cadmium selenide photosensitive layer, a cadmium sulfide photosensitive layer, various organic photosensitive layers, and the like are all used. However, in the present invention, it is particularly preferable to use an organic photoreceptor layer. That is, the organic photoreceptor layer can be provided at low cost,
This is because the workability of forming the photosensitive layer on the cylindrical substrate is particularly excellent.

The organic photoreceptor layer may be a monodisperse layer type photoreceptor containing a charge transporting agent, particularly a hole transporting agent and a charge generating agent, in a resin medium, or may contain a charge transporting agent. It may be a laminated type photoreceptor having a charge transport layer and a charge generating layer containing a charge generating agent. In this case, the charge generating layer (C
GL) and the charge transport layer (CTL) may be stacked in this order or in the reverse order.

Examples of the charge generating agent include selenium, selenium-tellurium, amorphous silicon, pyrylium salt,
Azo pigments, disazo pigments, ancesthrone pigments,
Phthalocyanine-based pigments, indico-based pigments, selen-based pigments, toluidine-based pigments, pyrazoline-based pigments, perylene-based pigments, quinacridone-based pigments, and the like are exemplified, and one or more of them are mixed so as to have an absorption wavelength range in a desired region. Used.

Various resins can be used as the resin medium in which the charge generating agent is dispersed, such as a styrene polymer, an acrylic polymer, a styrene-acrylic polymer, an ethylene-vinyl acetate copolymer, polypropylene,
Olefin polymers such as ionomers, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyester,
Alkyd resin, polyamide, polyurethane, epoxy resin, polycarbonate, polyarylate, polysulfone, diallyl phthalate resin, silicone resin, ketone resin, polyvinyl butyral resin, polyether resin,
Various polymers such as a phenol resin and a photocurable resin such as an epoxy acrylate can be exemplified. These binder resins may be used alone or in combination of two or more.
Suitable resins are polycarbonate, Panlite manufactured by Teijin Chemicals Limited, PCZ manufactured by Mitsubishi Gas Chemical Company, and the like.

As the charge transporting agent, any known electron transporting or hole transporting agent can be used. A suitable example is as follows.

Examples of the electron transporting agent include a paradiphenoquinone derivative, a benzoquinone derivative, a naphthoquinone derivative, tetracyanoethylene, tetracyanoquinodimethane, chloranil, bromoanil, 2,4,7-trinitro-9.
-Fluorenone, 2,4,5,7-tetranitro-9-
Electron-withdrawing substances such as fluorenone, 2,4,7-trinitro-9-dicyanomethylenefluorenone, 2,4,5,7-tetranitroxanthone, 2,4,8-trinitrothioxanthone, and these electron-withdrawing substances Which have been polymerized.

On the other hand, as the hole transporting substance, for example, the following substances are known, and among them, those having excellent solubility and hole transporting property are used. Pyrene, N-
Ethyl carbazole, N-isopropyl carbazole,
N-methyl-N-phenylhydrazino-3-methylidene-9-carbazole, N, N-diphenylhydrazino-
3-methylidene-9-ethylcarbazole, N, N-diphenylhydrazino-3-methylidene-10-ethylphenothiazine, N, N-diphenylhydrazino-3-methylidene-10-ethylphenoxazine, p-Diethylaminobenzaldehyde-N, N-diphenylhydrazone, p-diethylaminobenzaldehyde-α-naphthyl-N-phenylhydrazone, p-pyrrolidinobenzaldehyde-N, N-diphenylhydrazone, 1,3,3
-Trimethylindolenine-ω-aldehyde-N, N-
Hydrazone salts such as diphenylhydrazone, p-diethylbenzaldehyde-3-methylbenzthiazolinone-2-hydrazone, 2,5-bis (p-diethylaminophenyl) -1,3,4-oxadizole, 1-phenyl- 3- (p-diethylaminostyryl) -5- (p-diethylaminophenyl) pyrazolin, 1- [quinonyl (2)]-3- (p-diethylaminostyryl) -5-
(P-diethylaminophenyl) pyrazoline, 1- [pyridyl (2)]-3- (p-diethylaminostyryl)
-5- (p-diethylaminophenyl) pyrazoline, 1
-[6-Methoxy-pyridyl (2)]-3- (p-diethylaminostyryl) -5- (p-diethylaminophenyl) pyrazolin, 1- [pyridyl (3)]-3- (p
-Diethylaminostyryl) -5- (p-diethylaminophenyl) pyrazoline, 1- [repidyl (3)]-3
-(P-diethylaminostyryl) -5- (p-diethylaminophenyl) pyrazoline, 1- [pyridyl (2)]-3- (p-diethylaminostyryl) -4-
Methyl-5- (p-diethylaminophenyl) pyrazoline, 1- [pyridyl (2)]-3- (α-methyl-p-
Pyrazolines such as diethylaminostyryl) -3- (p-diethylaminophenyl) pyrazoline, 1-phenyl-3- (p-diethylaminostyryl) -4-methyl-5- (p-diethylaminophenyl) pyrazoline and spiropyrazoline; -(P-diethylaminostyryl)
-3-diethylaminobenzoxazole, 2- (p-
Oxazole compounds such as diethylaminophenyl) -4- (p-dimethylaminophenyl) -5- (2-chlorophenyl) oxazole, thiazole compounds such as 2- (p-diethylaminostyryl) -6-diethylaminobenzothiazole, Bis (4-diethylamino-
Triary such as 2-methylphenyl) phenylmethane
Methane compound, 1,1-bis (4-N, N-diethylamino-2-methylphenyl) heptane, 1,1,
2,2-tetrakis (4-N, N-dimethylamino-2
Polyarylalkanes such as -methylphenyl) ethane, N, N'-diphenyl-N, N'-bis (methylphenyl) bendiben, N, N'-diphenyl-N, N '
-Bis (ethylphenyl) benzidine, N, N'-diphenyl-N, N'-bis (propylphenyl) benzidine, N, N'-diphenyl-N, N'-bis (butylphenyl) benzidine, N, N'- Bis (isopropylphenyl) benzidine, N, N'-diphenyl-N, N '
-Bis (secondary butylphenyl) benzidine, N, N '
-Diphenyl-N, N'-bis (tertiarybutylphenyl) benzidine, N, N'-diphenyl-N, N'-bis (2,4-dimethylphenyl) benziben, N, N '
Benzidine-based compounds such as -diphenyl-N, N'-bis (chlorophenyl) benzidine, triphenylamine, poly-N-vinylcarbazole, polyvinylpyrene, polyvinylanthracene, polyvinylalixin,
Poly-9-vinylphenylanthracene, pyrene-formaldehyde resin, ethylcarbazole formaldehyde resin.

In the case of a monodispersed photosensitive layer, the charge generating agent (CGM) is preferably contained in the photosensitive layer in an amount of 1 to 7% by weight, particularly 2 to 5% by weight, based on the solid content. The charge transporting agent (CTM) is preferably contained in the photosensitive layer in an amount of 20 to 70% by weight, particularly 25 to 60% by weight, based on the solid content.

Further, from the viewpoint of sensitivity and the wide range of applications to enable reversal development, it is preferable to use an electron transporting agent (ET) and a hole transporting agent (HT) in combination. In this case, the weight ratio of ET: HT is 10: 1 to 1:10,
In particular, it is best to be in the range of 1: 5 to 1: 1.

The photoreceptor-forming composition used in the present invention includes:
Various compounding agents known per se, such as antioxidants, radical scavengers, singlet quenchers, UV absorbers, softeners, surface modifiers, and detergents, to the extent that they do not adversely affect the electrophotographic properties. , An extender, a thickener, a dispersion stabilizer, a wax, an acceptor, a donor, and the like.

When a sterically hindered phenolic antioxidant is added in an amount of 0.1 to 50% by weight based on the total solid content,
The durability of the photosensitive layer can be significantly improved without adversely affecting the electrophotographic properties.

In order to form a monodispersed layer type photoreceptor, a charge generating material, a charge transporting agent and a binder resin are mixed with a conventionally known method, for example, a roll mill, a ball mill, an attritor, and the like.
What is necessary is just to prepare using a paint shaker or an ultrasonic disperser, apply | coat and dry by a well-known coating means conventionally. The thickness of the photosensitive layer is not particularly limited, but is generally in the range of 5 to 100 μm, particularly preferably in the range of 10 to 50 μm.

As the solvent used for forming the coating solution, various organic solvents can be used, and alcohols such as methanol, ethanol, isopropanol and butanol,
n-hexane, octane, aliphatic hydrocarbons such as cyclohexane, benzene, toluene, aromatic hydrocarbons such as xylene, dichloromethane, dichloroethane, carbon tetrachloride, halogenated hydrocarbons such as chlorobenzene, dimethyl ether, diethyl ether, tetrahydrofuran, Various solvents such as ethers such as ethylene glycol dimethyl ether and diethylene glycol dimethyl ether; ketones such as acetone, methyl ethyl ketone and cyclohexanone; esters such as ethyl acetate and methyl acetate; dimethylformamide and dimethyl sulfoxide; Used as a mixture. In general, the solid content of the coating solution is preferably 5 to 50%.

In the case of a laminated photoreceptor, the charge generating agent (CGM) is added to the charge generating layer (CGL) in an amount of 30 per solid.
The charge transporting agent (CTM) is preferably present in an amount of from 20 to 70% by weight, especially from 3 to 90% by weight, in particular from 40 to 80% by weight, based on the solids content of the charge transporting layer (CTL).
It is preferably contained in an amount of 0 to 60% by weight. The components of each coating layer correspond to the components of the monodispersed layer type.

In the case of the substrate / CGL / CTL photoreceptor, CG
L should generally be in the range of 0.1 to 0.5 μm,
The CTL should be in the range of 5 to 40 μm, especially 10 to 25 μm.

In the case of the substrate / CTL / CGL photoreceptor, the CT
L has a thickness of 5 to 40 μm, especially 10 to 25 μm, while CGL preferably has a thickness of 0.1 to 0.5 μm. Further, a protective layer known per se can be provided on the CGL.

In the case of the organic photoreceptor layer, the formation of the photosensitive layer is advantageously performed by a blade coating method, a roller coating method, a spray coating method or a dip coating method. That is, in the case of the blade coating method, the roller coating method, and the spray coating method, the photoconductor composition can be applied only to the surface of the cylindrical substrate, so that the loss of the photoconductor composition is small and the economy is excellent. On the other hand, in the dip coating method, no air bubbles are trapped in the coating layer, and the resulting photosensitive layer has excellent mechanical properties and electrophotographic properties. In the dip coating method, there is a problem that the photoreceptor composition is also applied to the back side of the substrate, and the back side is wasted. In order to prevent this, a cap is fitted to at least one end of the substrate to prevent the photoreceptor coating composition from flowing around the back side of the substrate. That is, by immersing in the coating liquid with the cap-fitted side facing down, the liquid can be prevented from entering the inside of the substrate, and by dipping in the coating liquid with the cap-fitted side facing up. In addition, air is held inside the base, so that the liquid can be prevented from entering the inside.

[Full Color Image Forming Apparatus] The electrostatic latent image carrier of the present invention is a tandem type full color image forming apparatus,
That is, image formation is performed through charging, exposure, development and transfer of the photosensitive drum, and cyan and cyan are formed along the transfer path of the transfer paper.
When the present invention is applied to a full-color image forming apparatus provided with magenta, yellow, and black image forming units, a full-color image with good image quality without color shift can be formed.

FIG. 6 (side view) shows an example in which the present invention is applied to a full-color image forming apparatus. Is provided with a printed material receiver 18. A transfer paper transport unit 43 extending in the machine longitudinal direction is disposed above the paper feed cartridge 3, and black B, magenta M, and cyan C are provided above the transfer paper transport unit along the transfer paper transport path.
And image forming units 10B, 10M, 1
0C and 10Y are provided. On these image forming units, image exposure units 20B, 20M, 20C, 2
0Y is provided.

Above one end of the paper supply cartridge 2, a paper supply roller 5 driven at the time of paper supply is provided. Below the paper supply roller 5, a spring (not shown) extends upward. There is also a pressurized paper press. In addition, paper P
A guide 4, a roller 6, and a nip roller 7 for guiding the sheet to the transfer paper transport section 40 are also provided.

In the transfer paper transport section 43, the transport belt 4
6 is a pair of rollers 44 and 45 and another supporting roller 4
The transfer rollers 50B, 50M, 50C, and 50Y are provided below the belt corresponding to the image forming units 10B, 10M, 10C, and 10Y of the respective colors.
Is located. The belt cleaning unit 17 is provided on the roller 44 located on the discharge side. The transfer paper transporting section 43 is unitized with the drawer 41 in the form of a unit 40, and can be pulled out by the guide rail.

The image forming units 10 B, 10 M, 10
Each of C and 10Y includes a photosensitive drum 11 of each color, a main charging mechanism 12, a developing unit 13, a transfer roller 50, and a cleaning mechanism 14 arranged around the drum.

The developing unit 13 includes a toner cartridge 87 containing the toner, a sub-roller 16 for stirring and supplying the toner, a developing roller 15 for applying the toner to the surface of the photosensitive member,
Blade 8 for adjusting toner thickness on developing roller
6 is provided.

The image exposure units 20B, 20M, 20 of each color
The light from C and 20Y is the photosensitive drums 11B and 1B of each color.
1M, 11C, and 11Y are introduced between the main charger 12 and the developing unit 13 so that exposure is performed.

In the image forming section for each color, the photosensitive layer is uniformly charged by main charging from the corona charger 12 of the photoreceptor 11, and an electrostatic latent image is formed by image exposure using laser light of the optical system 20. The electrostatic latent image thus developed is developed with toner by the developing unit 13 to form a toner image on the photoconductor 11. The toner image formed on the photoreceptor is transferred to a transfer roll 5
By the transfer electric field applied to 0, the image is transferred onto the transfer paper supplied below the photoconductor, and this operation is performed for each color of black B, magenta M, cyan C, and yellow Y.
In the present invention, the surface formation of the photoreceptor drum substrate is performed by the above-described means, thereby improving the deflection accuracy of the drum, thereby preventing color misregistration due to variations in peripheral speed, and forming a high-quality full-color image. be able to.

The transfer paper on which the toners of black B, magenta M, cyan C and yellow Y have been transferred is separated from the conveyor belt 46 by the paper separating device 19 and then sent to the fixing unit 80 where the toner is transferred. An image is fixed. The fixing unit 80 includes a heater roll 82 having a heat source 90 therein, and a heating belt 8 passing through the heater roll 82, the pressure roll 81, and the cleaning roll 84.
3 and a pressure roll 8 via a belt 83.
The toner is fixed by sandwiching the transfer paper between the transfer roller 1 and the receiving roll 85. The print on which the toner has been fixed is discharged onto the print receiver 18 by the guide roll pairs 8 and 9.

In the full-color image forming apparatus of the present invention, non-magnetic one-component toner, magnetic
Although any of the component toners is used, a non-magnetic one-component toner is preferable because the configuration of the developing device is simple. This toner contains a fixing resin component, a colorant, a high molecular weight or low molecular weight charge control agent, a release agent, and the like, or a magnetic powder as necessary.

As the fixing resin medium, any of a thermoplastic resin and a thermosetting resin in the form of an uncured or precondensed product is used. For example, a vinyl aromatic resin such as polystyrene, an acrylic resin, a polyvinyl acetal resin, Examples thereof include a polyester resin, an epoxy resin, a phenol resin, a petroleum resin, and a polyolefin resin. Among them, a styrene resin, an acrylic resin, or a styrene-acryl copolymer resin is preferably used. The fixing resin contains a cationic or anionic polar group in the form of a blend or in the form of a copolymer.

As the colorant for the toner, an inorganic or organic pigment or dye is used. In the case of full color, a known full color pigment or dye suitable for cyan, magenta, yellow and black is used.

Examples of the charge controlling agent include those known per se, for example, oil-soluble dyes such as nigrosine base (CI 5045), oil black (CI 26150), and spiron black;
In addition to a metal salt of naphthenic acid, a metal soap of a fatty acid, a metal-containing complex dye, and the like, a resin containing a charge-controlling functional group can also be used. Such functional groups include sulfonic acid,
Phosphoric acid, carboxylic acid type anionic group, or primary-,
There are electrolytic groups such as cationic groups such as secondary- or tertiary-amino groups and quaternary animonium groups.

Various waxes, low molecular weight olefin resins, and the like can be contained in the resin as a releasing agent for heat fixing. As the olefin-based resin, polypropylene, polyethylene, and a propylene-ethylene copolymer are used, and polypropylene is particularly preferable.

The toner particles are preferably excellent in the fluidity of the particles. For this purpose, carbon black,
A fluidity improver such as hydrophobic amorphous silica, hydrophobic fine alumina powder, fine titanium oxide, and fine spherical resin is dusted to obtain a final toner.

From the viewpoint of the resolution of the obtained image, a small particle size toner having a particle size (center particle size on a volume basis) of 8 μm or less is preferable. Further, in terms of development characteristics, the following formula: Circularity = Toner having a circularity of 0.94 or more defined by the following formula: Circularity = Circumference length of circle having the same area as the area of projected toner particles / Contour length of projected toner particles It is preferable to use

A spherical toner having a small particle diameter can be easily obtained by a polymerization method. Polymerized spherical toner is a radical polymerization initiator,
It can be obtained by subjecting a toner-forming composition containing at least the above-described components to a vinyl-based monomer which can be a fixing resin and suspension polymerization in an aqueous medium.

It is preferable that the charge polarity of the toner and the charge polarity of the dark portion of the photoreceptor be the same, and that reversal development be performed under development conditions under which the residual toner on the dark portion of the photoreceptor becomes substantially zero.

The formation of an electrostatic latent image on a single-layer organic photoreceptor is performed by the charging and exposure described above. In the case of non-magnetic one-component development, a non-magnetic one-component toner layer is formed on an elastic developing roller. Then, this is performed by pressing against the surface of the photoreceptor.

In the case of non-magnetic one-component development, as the elastic developing roller, a roller obtained by molding a composition obtained by mixing a conductive powder with an elastomer polymer is used.

In the electrophotographic method of the present invention, transfer of a toner image, paper separation, cleaning, and the like can be carried out using known means under known conditions.

According to the present invention, a hollow cylindrical metal or metal
In an electrostatic latent image carrier having a photosensitive layer on the outer surface of a gold substrate, the outer surface of the metal or alloy substrate is formed by cutting around a rotation center under a condition used in an image forming apparatus.
Because it is done by the generation of rotational deflection due to the eccentricity is eliminated, thereby enabling accurate imaging. Further, the electrostatic latent image carrier of the present invention has an advantage that it can be mounted on a tandem-type full-color printer to form a full-color image without color shift.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration of an electrostatic latent image carrier.

FIG. 2 is an explanatory view showing a processing order of a conventional electrostatic latent image carrier.

FIG. 3 is an explanatory diagram showing a processing order of the electrostatic latent image carrier of the present invention.

FIG. 4 is a perspective view schematically showing an apparatus for measuring the deflection accuracy of the electrostatic latent image carrier.

FIG. 5 is a graph showing the deflection of a drum.

FIG. 6 is a side view showing an example in which the present invention is applied to a full-color image forming apparatus.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-74570 (JP, A) JP-A-7-299710 (JP, A) JP-A 8-123060 (JP, A) JP-A 8- 146625 (JP, A) JP-A-8-234464 (JP, A) JP-A 8-276301 (JP, A) JP-A 8-36267 (JP, A) JP-A 8-328282 (JP, A) JP-A-6-322111 (JP, A) JP-A-11-15180 (JP, A) JP-A-10-9917 (JP, A) JP-A-60-257476 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03G 5/00 101 G03G 5/10 G03G 21/00 350

Claims (5)

(57) [Claims] 1. An outer surface of a hollow cylindrical metal or alloy substrate.
An electrostatic latent image bearing member having a photosensitive layer on the surface, the metal
The formation of the outer surface of the alloy base is used in an image forming apparatus.
The flange having the center of rotation under the condition
Attached to both open ends of the substrate, and then
An electrostatic latent image carrier, characterized by being cut by rotation . Wherein wherein the photosensitive layer is formed of an organic material
Item 2. An electrostatic latent image carrier according to Item 1 . Wherein the photosensitive layer formed after cutting blade coating, roller coating, or performed by a spray coating
The electrostatic latent image carrier according to claim 2 , wherein 4. A photosensitive layer is formed by dip coating with a cap fitted on at least one end of the substrate after cutting .
An electrostatic latent image carrier according to claim 2 . 5. An image forming apparatus using a plurality of electrostatic latent image carriers, wherein the electrostatic latent image carrier according to claim 1 is used.