JPH08286498A - Developer carrier - Google Patents

Abstract

PURPOSE: To provide a developer carrier having excellent durability which does not cause defects in the formed layers and can prevent ghosts during development by forming a first coating layer of a first conductive coating material containing particles of a specified volume average particle size to give a rough surface and then forming a second coating layer of a second conductive coating material containing no particle component of a specified volume average particle size to constitute the carrier. CONSTITUTION: A sleeve 1 as the developer carrier consists of a cylindrical sleeve base material 2 and a first coating layer 3 and a second coating layer 4 successively formed on the base body 2. The first and second coating layers 3, 4 are produced by forming the first coating layer 3 of a first conductive coating material containing particles of >=2.0μm volume average particle size to give a rough surface, or forming the first layer 3 of a conductive coating material containing no particle component of >0.5μm average particle size and then polishing the layer surface, and then forming the second coating layer 4 of a conductive coating material containing no particle component having >0.5μm average particle size. The surface of the roller is thereby made smooth with lots of projections, which can prevent ghosts during development.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developer carrier used in a one-component developing device applied to an image forming apparatus such as a copying machine and a printer using an electrophotographic system, and more particularly to a one-component developer. The present invention relates to a developer carrier used in a one-component developing device for carrying out non-contact development by transporting the toner to a developing area while being thinned by a developer regulating member on the developer carrier and at the same time being charged.

[0002]

2. Description of the Related Art Conventionally, as a one-component developing device for developing an electrostatic latent image formed on an electrostatic latent image bearing member with a one-component developer, various ones are available according to the type of the one-component developer used. A type has been proposed, and among them, the following is known as a one-component developing device using a magnetic one-component developer.

That is, such a one-component developing device includes a hopper for containing a magnetic one-component developer, a cylindrical developer carrier rotatably supported around a magnet shaft having a plurality of magnetic poles, and a developer. A one-component developer housed in a hopper, which is provided with a developer regulating member that regulates the amount of developer adhered to the carrier, and is developed after being retained on the developer carrier by the magnetic force of the magnet shaft. By being rubbed against the surface of the developer carrying member by the agent regulating member, a thin layer is formed and at the same time, frictional charging is performed. Then, the thin-layered and charged one-component developer is conveyed to the development area where the developer carrying member and the electrostatic latent image carrying member are opposed to each other with a gap by the rotation of the developer carrying member, and the development thereof is performed. The developing electric field formed in the area causes the electrostatic latent image carrier to fly toward and adhere to the electrostatic latent image, so that non-contact development is performed.

By the way, in this kind of one-component developing device, there is a peculiar problem that a history of an image pattern in the immediately preceding developing step appears, that is, a so-called development ghost occurs. This development ghost is exchanged between the developer consuming portion and the non-consuming portion on the developer carrier in the immediately preceding developing step, while new developer is exchanged in the consuming portion, whereas it is exchanged in the non-consuming portion. Due to the difficulty, the number of times the developer passes through the developer regulating member is different, and therefore the triboelectric charge amount and the degree of particle size reduction due to the developer regulating member are different (the non-consumable portion of the developer is different from the consuming portion Compared with this, the number of times of passing through the developer control member is large, so the charge amount is large and the diameter is further reduced),
It is said that this is caused by a difference in developing performance.

Therefore, in order to avoid such a problem of development ghost, for example, in JP-A-1-27674, the outermost surface layer portion has a gravel-like shape (the size of secondary particles is about 0.1 to 0). 0.3 μm, the interval between the secondary particles is about 0.1 to 0.
A one-component developing device using a developer carrier having a conductive resin layer in which conductive particles and secondary particles (having a size of 1.0 μm or less) made of a resin are distributed so as to have an unevenness of 4 μm). Proposed. In this one-component developing device, the outermost layer of the developer carrying member is formed into a gravel-shaped uneven surface to promote leakage of the electrostatic charge of the developer and prevent charge-up of the developer. It tries to avoid ghosts.

However, in the technique disclosed in this publication, in order to obtain a conductive resin layer having the above-mentioned gravel road-like uneven surface, the developer carrying member is blasted after the surface of the base material of the developer carrying member is blasted. By forming the resin layer, the surface roughness of the blasted surface is reflected on the surface of the resin layer. Therefore, the surface roughness of the blasted surface is reflected on the coating film surface, and a predetermined volume resistivity ( 10 ² to 10 ^-4 Ω · c
The thickness of the conductive resin layer cannot be increased (maximum 30 μm) in order to secure m). Therefore, wear deterioration of the resin layer due to the contact type developer regulating member becomes remarkable, and durability is improved. There was a problem that it was inferior to.

Further, as in the technique disclosed in the above publication, a developer carrying member having a conductive resin layer having a desired roughness formed thereon is subjected to roughening such as blasting on the base material of the developer carrying member. If the production is attempted by directly forming the resin layer by a spray coating method or the like without applying it, there are the following problems. That is, secondary particles having a size of about 1 to 10 μm appear on the outermost surface layer of the conductive resin layer, which causes the developer fluidity between the surface of the developer carrier and the developer regulating member. Since it is difficult to replace the developer on the developer carrier, it is possible to reduce the diameter of the developer in the non-consumer of the developer by the developer regulating member, resulting in the development ghost. There is a problem that it gets worse. Also, the size on the surface of the conductive resin layer is 5 μm.
The protrusion of the secondary particles damages the abutting tip of the contact type developer regulating member, which causes streaky layer formation failure (black layer) on the developer thin layer on the developer carrier. There is a problem that streaks occur, and the streaks particularly appear in a halftone image and cause poor image quality.

Further, after the developer carrying member having a conductive resin layer having a desired roughness formed as in the technique disclosed in the above publication, for example, the conductive resin layer is formed on the base material of the developer carrying member, In the case where an attempt is made to obtain a desired surface roughness by surface polishing treatment or the like, there are the following problems. That is, since the exposed particle component of the conductive resin layer is removed by the surface polishing treatment to form an acute-angled recessed portion (undercut portion) having a pore diameter of about several μm, the surface of the resin layer is roughened. As a result, the fluidity of the developer between the surface of the developer carrying member and the developer regulating member is lowered, and it becomes difficult to exchange the developer on the developer carrying member as in the case described above. There is a problem that the diameter of the developer in the material non-consuming portion is reduced by the developer regulating member, and as a result, the development ghost is deteriorated.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a developer carrier used in a one-component developing device, which has excellent durability and causes defective layer formation (black streaks) on the developer carrier. It is another object of the present invention to provide a developer carrier capable of preventing development ghosts.

[0010]

In the developer carrying member of the present invention, a one-component developer is thinned by a developer regulating member on the developer carrying member and at the same time conveyed to a developing area in a charged state. A developer carrying member used in a one-component developing device for performing non-contact development by means of a first conductive material containing particles having an irregular surface with a volume average particle size of 2.0 μm or more on the substrate surface of the developer carrying member. A first coating layer made of a conductive coating material, and a second coating layer made of a second conductive coating material containing no particle component having a volume average particle size of more than 0.5 μm is provided on the first coating layer. It is characterized by being present.

The irregular surface-imparting particles contained in the first conductive coating material have a volume average particle size of 2.0 μm or more, preferably 2.0 to 10 μm. If the volume average particle diameter is less than 2.0 μm, the surface of the second coating layer cannot have a predetermined surface roughness. As the irregular surface-imparting particles, in addition to graphite, metal powder such as copper powder, stainless powder, iron powder, and alumina, potassium titanate, silica, silicon carbide, silicon nitride, tyrane oxide, etc. which also function as a reinforcing material. Conductive reinforcing particles and the like are used. The first coating layer formed of this first conductive coating has a thickness of at least 30 μm or more, preferably 30 to 50 μm.
It is preferable to form so that the average surface roughness (Ra) of the center line is Ra = 0.7 to 2.5 μm.

The second conductive coating material may be a conductive coating material which does not contain a particle component having a volume average particle size of more than 0.5 μm, and contains a particle component having a volume average particle size of more than 0.5 μm. 2 if the size is 1 μm or more
The secondary particles may project onto the surface of the second coating layer, which is not preferable. The first coating layer formed of this second conductive coating material is formed to have a thickness of 0.5 to 5 μm, and its center line average surface roughness Ra is Ra = 0.3 to 2. 0μ
m, preferably 0.7 to 1.8 μm. If Ra is less than 0.3 μm, the developer conveyance failure occurs. On the other hand, if it exceeds 2.0 μm, the developer conveyance amount becomes excessive, and the charge by the developer regulating member is not good, and the density of the developed image decreases. cause.

Further, in the developer carrying member of the present invention, in the above technical means, the first electroconductive coating material contains 10 particles of the conductivity-imparting particles having a volume average particle diameter of 0.5 μm or less with respect to 100 parts by weight of the base resin. ~ 60 parts by weight, volume average particle size 2.0 μm
30 to 250 parts by weight of the above uneven surface imparting particles are blended, respectively, and the second conductive coating material has a volume average particle diameter of 0.5 μm or less with respect to 100 parts by weight of the base resin. It is desirable that 10 to 60 parts by weight are blended.

As the conductivity-imparting particles in the above-mentioned first conductive paint, carbon black, and among them, highly conductive carbon such as acetylene black and furnace black is used. The compounding amount of the particles for imparting conductivity is 10 to 60.
The amount is preferably 20 to 40 parts by weight, but if the blending amount is less than 10 parts by weight, the conductivity of the first coating layer will be insufficient even if highly conductive carbon is used, and conversely 60 parts by weight. If the amount exceeds the above range, carbon black cannot be dispersed in the resin, and a spray coatable coating cannot be obtained.

The amount of the irregular surface-imparting particles is 30 to 250 parts by weight, preferably 30 to 150 parts by weight. When the amount is less than 30 parts by weight, the surface of the first coating layer becomes a smooth surface, The surface roughness of the second coating layer required for transporting the developer cannot be obtained. On the other hand, when it exceeds 250 parts by weight, problems such as poor dispersion of the coating liquid and reduction in coating film strength may occur even with alumina having a high specific gravity. appear. Further, this blending amount is 30 to 60 when graphite is used as the uneven surface-providing particles.
Parts by weight are preferred.

On the other hand, as the conductivity-imparting particles in the second conductive paint, the conductivity-imparting particles of the first conductive paint can be similarly used, and conductive zinc oxide, metal oxides such as tin oxide and titanium black can be used. Material powder is used. The conductivity-imparting particles are compounded in an amount of 10 to 100 parts by weight, preferably 30 to 70 parts by weight, but if the amount is less than 10 parts by weight, the second coating layer will be used even if highly conductive carbon is used. In contrast, when the amount exceeds 100 parts by weight, the surface of the second coating layer cannot be made to have a desired roughness even if it is a conductive zinc oxide having a high specific gravity. Secondary particles are projected on the surface.

As the base resin in the first and second conductive paints, in addition to thermosetting acrylic resin, epoxy resin, phenol resin, polyester resin, fluorine resin and the like are used. The first coating layer and the second coating layer are formed by applying each conductive coating material by a spray coating method, a dipping method, a rolling method or the like.

Further, the developer carrying member of the present invention is a developer carrying member used in a one-component developing device similar to the above-mentioned technical means, and the surface of the base material of the developer carrying member is made of a conductive paint. A first coating layer is provided, and a second coating layer made of a conductive coating material containing no particle component having a volume average particle size of more than 0.5 μm is provided on the polished surface after the surface polishing of the first coating layer. It is characterized by being.

In the technical means, as the conductive coating material for forming the first coating layer and the second coating layer, those having the same composition are generally used, but of course different compositions may be used individually. Good. Then, as the conductive paint at this time, basically, the second conductive paint for forming the second coating layer in the above technical means can be used.
That is, it is possible to use a conductive paint in which 10 to 100 parts by weight, and preferably 30 to 70 parts by weight of conductivity-imparting particles having a volume average particle diameter of 0.5 μm or less are mixed with 100 parts by weight of the base resin.

In particular, if the amount is less than 10 parts by weight, the conductivity of the first and second coating layers will be insufficient even if highly conductive carbon is used. On the contrary, the blending amount is 100
If the amount exceeds 5 parts by weight, the surface of the second coating layer cannot be made to have a desired roughness even if the conductive zinc oxide has a high specific gravity, and secondary particles are projected on the surface of the second coating layer. I will end up. The reason why secondary particles are projected on the surface of the second coating layer is that if the conductivity-imparting particles are compounded in an amount of more than 100 parts by weight, the conductivity-imparting particles are likely to aggregate, and the aggregation of the particles increases. This is because the particles appear as secondary particles having a large particle size.

As the means for polishing the surface of the first coating layer, in addition to the sanding method, blasting, shot beaning using glass beads, centerless polishing (mechanical polishing), etc. are applied. In this surface polishing, the surface roughness (Ra) (in the developer carrying direction) of the first coating layer is R.
a = 0.3 to 2.5 μm, preferably 0.8 to 2.0 μm
It is preferable to carry out so that m. The surface roughness of the second coating layer is Ra = as in the case of the above technical means.
0.3-2.0 μm. It is preferably 0.7 to 1.8 μm. The thickness of the first coating layer is slightly thicker than that of the first coating layer in the above technical means, preferably 40 to 10
0 μm.

[0022]

According to the present invention, either on the first coating layer made of the first conductive coating material containing the irregular surface-providing particles having a volume average particle diameter of 2.0 μm or more, or the volume average particle diameter is 0.5 μm. On the polished surface after surface-polishing the first coating layer made of a conductive coating material containing no particle component exceeding 0.10.
By forming the second coating layer made of a conductive coating material that does not contain a particle component exceeding 5 μm, there is no protrusion of secondary particles of 1 to 10 μm, especially 5 μm or more on the surface of the second coating layer, and A surface roughness necessary and sufficient for transporting the developer is secured.

[0023]

Embodiments of the present invention will now be described in detail with reference to the drawings.

Embodiments 1 and 2 FIGS. 1A and 1B show a developer carrying member (sleeve) according to Embodiments 1 and 2 of the present invention. FIG. 1A is a sectional view thereof, and FIG. It is a figure. A sleeve 1 which is a developer carrying member of this embodiment includes a sleeve base material 2 having a cylindrical shape,
It is composed of a first coating layer 3 and a second coating layer 4 which are sequentially formed by coating on the base material 2. Reference numeral 13 in the figure denotes a developer regulating member. The sleeve base 2 is a cylindrical aluminum pipe having an outer diameter of 18 mm and an inner diameter of 16.5 mm.

The first coating layer 3 is a thermosetting acrylic resin 1
The average volume particle size as conductivity-imparting particles is 0.
20 parts by weight of carbon black having a diameter of 02 μm and graphite 50 having an average volume particle diameter of 3.0 μm as particles for imparting an uneven surface
It was formed by using a first conductive coating material prepared by mixing each part by weight with solid content to prepare a solid content and a volatile component such as a solvent having a ratio of 10: 5 to 20. It is a thing. That is, after applying the first conductive paint to the sleeve base material 2 by a spray coating method,
By heat-drying at 60 ° C. and heat-curing at 170 ° C., the film thickness is 30 to 50 μm, and the surface roughness is Ra =
The first coating layer 3 of 1.3 was formed.

In the case of Example 1, the second coating layer 4 has 100 parts by weight of a thermosetting acrylic resin and carbon black 40 having an average volume particle diameter of 0.02 μm as conductivity imparting particles.
Formed by using a second conductive coating material A prepared by blending parts by weight as a solid content and prepared so that the ratio of the solid content to a volatile component such as a solvent is 10:10 to 40. Is. That is, by applying the second conductive coating material A onto the first coating layer 3 of the sleeve base material 2 by a spray coating method, heat drying at 60 ° C. and heat curing at 170 ° C. A second coating layer 4 having a film thickness of 0.5 to 5 μm and a surface roughness Ra = 1.0 was formed. And
The sleeve 1 having the second coating layer 4 formed thereon is referred to as Example 1.

In the case of Example 2, the second coating layer 4 comprises 100 parts by weight of a thermosetting acrylic resin, 20 parts by weight of carbon black having an average volume particle size of 0.02 μm as conductivity-imparting particles, and an average of A mixture of 50 parts by weight of conductive zinc oxide doped with aluminum oxide having a volume particle size of 0.1 μm is used as a solid content, and the ratio of the solid content to a volatile component such as a solvent is 10:10 to 40. It is formed by using the second conductive paint B prepared in 1. That is,
By applying the second conductive coating material B on the first coating layer 3 of the sleeve base material 2 by a spray coating method, and then heat-drying and heat-curing the same conditions as in the case of Example 1 above. , Film thickness 0.5 to 5 μm, surface roughness R
The second coating layer 4 with a = 0.9 was formed. Then, the sleeve 1 having the second coating layer 4 formed thereon is referred to as Example 2.

Next, the sleeve 1 according to the first and second embodiments.
Was applied to a one-component developing device and the following test was conducted.

FIG. 2 shows the construction of a one-component developing device to which the sleeves of Examples 1 and 2 are applied. This developing device uses a magnetic one-component developer as a developer. In FIG. 2, 11 is the apparatus main body and 12 is the sleeve 1.
A magnetic shaft installed inside, 13 is a developer regulating member,
14 is a developer stirring means, 15 is a developing bias power source, 16
Is a magnetic one-component developer, and 20 is a photosensitive drum as an electrostatic latent image holding member.

The photosensitive drum 20 is a drum having a photoconductive surface layer made of a negatively charged organic photoconductor, and known electrophotographic process equipment is arranged around the photoconductive surface layer.
The photosensitive drum 20 rotates in the direction of the arrow in the figure, and when an electrostatic latent image is formed by an electrophotographic process, the surface potential is, for example, −100 V in the image portion and −360 V in the background portion. Is set to.

The sleeve 1 is rotatably arranged at a predetermined position of the apparatus main body 11 so as to face the photosensitive drum 20 with a predetermined gap. The sleeve 1 rotates in the direction of the arrow in the figure, and the gap at the position A (developing area) near the photosensitive drum 20 is 200 to 350 μm.
It is set to be about m.

The magnetic shaft 12 has a plurality of magnets arranged along the peripheral surface thereof, and is fixedly supported at a predetermined position of the apparatus main body 11 so as not to rotate. This magnetic shaft 12
For example, a magnetic pattern is formed by arranging S poles and N poles, which are a plurality of magnets, as shown in the drawing, and the magnetic one-component developer 16 is attracted to the surface of the sleeve 1 along the magnetic patterns. .

The developer regulating member 13 comprises a soft elastic body 13a which is pressed against the surface of the sleeve 1 and a spring plate 13b which supports the soft elastic body 13a near one end thereof.
The other end of is fixedly supported. At the contact position of the soft elastic body 13a with respect to the sleeve 1, the sleeve 1 is located at the photosensitive drum 20.
Is a position at an angle of 80 ° on the upstream side in the rotation direction of the sleeve 1 with respect to a reference line connecting the position closest to the position of the magnetic shaft 12 and the free end of the spring plate 13b supporting the soft elastic body 13a. The sleeve 1 is installed so as to face the downstream side in the rotation direction of the sleeve 1. Further, the developer regulating member 13
Is a soft elastic body 13a with a width of 15 mm and a thickness of 1.0 m
m, silicone rubber with rubber hardness of 50 ° is used as the spring plate 13b.
Thickness of 0.1 mm and stainless steel plate (SUS
304CSP 3/4 material, tensile strength 95kgf / mm ² ,
A yield strength of 68 kgf / mm ² ) is used.

The developing bias power source 15 is a high voltage AC power source 1.
5a and a DC power supply 15b, and the sleeve 1 uses an AC voltage on which a DC voltage is superimposed as a developing bias voltage.
Applied to the photosensitive drum 2 in the developing area A.
An alternating electric field is generated between it and zero. This developing bias has a frequency of 2.4 kHz, an AC voltage of 2000 V and a peak-to-peak voltage of -250, and the like.
It is set to use a DC voltage of V.

Development by such a one-component developing device is
It is performed as follows. That is, the magnetic one-component developer 16 contained in the hopper portion of the apparatus main body 11 is adsorbed on the surface of the sleeve 1 while being stirred by the developer stirring means, and the soft elastic body 13a of the developer regulating member 13 causes the sleeve 1
Rubbed on the surface. As a result, the developer 16 is thinned and at the same time frictionally charged to a predetermined polarity. Next, the thinned developer 16 is transported to the development area A by the rotation of the sleeve 1, and flies so that the developer particles reciprocate due to the alternating electric field in the development area A to form a cloud shape. Then, the cloud-shaped developer 16 is attracted and adhered to the electrostatic latent image portion on the photosensitive drum 20 by the DC component of the developing bias voltage, and thus the development is completed.

Then, the above-mentioned one-component developing device was mounted on a commercially available printer (Fuji Xerox: 4105),
Amount of developer conveyed through the sleeve, amount of charge of the developer after passing through the developer regulating member, difference in particle size of the developer on the sleeve between the developer consuming portion and the non-consuming portion, and the developer at the time of forming a 50% halftone image The difference in development density between the consumed portion and the non-consumed portion and the number of black stripes generated in the thin developer layer on the sleeve were examined, and the results are shown in Table 1.

For comparison, a sleeve in which the second coating layer 4 was not formed (the first coating layer 3 was formed) in Examples 1 and 2 was produced as Comparative Example 1, and a one-component developing device to which the sleeve was applied was prepared. It prepared and the above-mentioned test was done similarly.
The surface of the first coating layer in the sleeve of Comparative Example 1 was not polished, and its surface roughness was Ra = 1.3 μm.

The developer transport amount was measured by the tape transfer method, and the charge amount was measured by the suction tribo method.
As a reference, the development ghost occurs when the difference in development density between the developer consuming portion and the non-consuming portion is 0.02 or more. Regarding the final image quality defect due to black streaks, about 5 to 6 streaks are generated on the print when the number of black streaks is about 150, but when the number of black streaks is 15 or less, the image quality on the print is reduced. There is no muscle development.

[0039]

[Table 1]

From the results shown in Table 1, it was confirmed that in Examples 1 and 2, black stripes including the development ghost generated in Comparative Example 1 could be reliably prevented without impairing the developer transport performance. In addition, in the case of Example 2, it was confirmed that the charging property was better than that of Example 1 and the occurrence of black streaks could be suppressed.

Embodiment 3 FIG. 3 shows a developer carrying member (sleeve) according to Embodiment 3 of the present invention, (a) is a sectional view thereof, and (b) is a partially enlarged view thereof. The sleeve 10 as the developer carrying member of this embodiment includes a first coating layer 30 formed on the sleeve base material 2 and a second coating layer formed on the surface-polished surface 30a of the first coating layer 30. Examples 1 and 2 except that
It has the same structure as.

The first coating layer 30 comprises 100 parts by weight of a thermosetting acrylic resin, 20 parts by weight of carbon black having an average volume particle size of 0.02 μm and aluminum oxide having an average volume particle size of 0.1 μm as conductivity imparting particles. A conductive paint C prepared by blending 50 parts by weight of doped conductive zinc oxide as a solid content and prepared so that the ratio of the solid content to a volatile component such as a solvent is 10: 5 to 20. It is formed by using. That is, after applying the conductive paint C to the sleeve base material 2 by the spray coating method,
The first coating layer 3 having a film thickness of 40 to 100 μm was formed by heat drying at 0 ° C. and heat curing at 170 ° C.

The surface of the first coating layer 30 is polished in the longitudinal (axial) direction of the sleeve 1 with No. 600 sandpaper, and the surface roughness of the polishing surface 30a with respect to the sleeve rotation direction is Ra = 0. It was set to 5 to 0.8. In FIG. 3, reference numeral 31 is an undercut portion generated by the surface polishing.

The second coating layer 40 uses the same solid content as the conductive coating C used to form the first coating layer 30, and the ratio of the solid content to the volatile components such as solvent is 10:10. It is formed by using the conductive coating material D prepared so as to be 40. That is, the conductive coating material D is applied to the polishing surface 30a of the first coating layer by a spray coating method, and then dried by heating at 60 ° C. and heat curing at 170 ° C. The second coating layer 4 having a surface roughness of Ra = 0.4 in the sleeve rotation direction of 5 to 5 μm.
Formed 0.

Next, the sleeve 10 according to the third embodiment was applied to the one-component developing device (FIG. 2) in the same manner as in the first and second embodiments, and the same test was conducted. The results are shown in Table 2.

For comparison, a sleeve in which the second coating layer 40 in Example 3 was not formed (the same surface polishing was performed after forming the first coating layer 30) was prepared as Comparative Example 2, and the sleeve was applied. A component developing device was prepared and the same test was conducted. The surface roughness of the polished surface of the first coating layer in the sleeve of Comparative Example 2 was Ra = 0.6 μm.

[0047]

[Table 2]

From the results shown in Table 2, good results were obtained in which there was no problem in the occurrence of black streaks in both Example 3 and Comparative Example 2, but the development ghost occurred in Comparative Example 2. On the other hand, it was confirmed that the occurrence was prevented in Example 3.

In each of the above-described embodiments, the magnetic component is used as the one-component developer 16, but a non-magnetic one-component developer may be used in the present invention.

[0050]

As described above, according to the present invention,
From a first coating layer made of a first conductive coating material containing particles having a textured surface with a volume average particle diameter of 2.0 μm or more, or from a conductive coating material containing no particle component having a volume average particle diameter of more than 0.5 μm. The second coating layer made of a conductive coating material containing no particle component having a volume average particle size of more than 0.5 μm is formed on the polished surface after the surface polishing of the first coating layer Since the surface of the coating layer is a relatively smooth uneven surface without protrusion of secondary particles of 1 to 10 μm, good fluidity of the developer between the developer carrying member and the developer regulating member can be secured, The diameter of the developer is prevented from being reduced in the non-consumer of the developer, and as a result, the development ghost can be prevented.

Further, since the surface of the second coating layer is free of protrusion of secondary particles of 5 μm or more, it is possible to prevent defective formation of layers (black streaks) on the developer carrying member, and defective image quality in a halftone image. Can also be prevented.

Furthermore, the coating layer has a two-layer structure, and
The surface roughness that is necessary and sufficient for transporting the developer can be secured, so it has excellent durability and enables long-term reliable use.

[Brief description of drawings]

1A and 1B show a developer carrier according to Examples 1 and 2 of the present invention, in which FIG. 1A is a sectional view thereof, and FIG. 1B is a partially enlarged sectional view thereof.

FIG. 2 is a schematic configuration diagram showing an example of a one-component developing device to which the developer carrier of the present invention is applied.

3A and 3B show a developer carrying member according to Embodiment 3 of the present invention, in which FIG. 3A is a sectional view thereof and FIG. 3B is a partially enlarged sectional view thereof.

[Explanation of symbols]

1, 10 ... Developer carrying member, 2 ... Base material, 3, 30 ... First coating layer, 4, 40 ... Second coating layer, 13 ... Developer regulating member,
16 ... One-component developer, 30a ... Abrasive surface, A ... Development area.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shin Hirota 2274 Hongo, Ebina City, Kanagawa Prefecture, Fuji Xerox Co., Ltd. ) Inventor Keiji Tsuchiya 2274 Hongo, Ebina City, Kanagawa Prefecture Fuji Xerox Co., Ltd.

Claims (3)

[Claims] 1. A development used in a one-component developing device for carrying out non-contact development by carrying out a one-component developer on a developer carrying member to a thin layer by a developer regulating member and at the same time carrying it in a charged state to a developing region for non-contact development. An agent carrier, wherein a first coating layer made of a first conductive coating material containing particles having a textured surface with a volume average particle size of 2.0 μm or more is provided on the surface of the base material of the developer carrier. A developer carrier comprising a single coating layer and a second coating layer made of a second conductive coating material containing no particle component having a volume average particle size of more than 0.5 μm. 2. The developer carrying member according to claim 1, wherein
The first conductive paint contains 10 to 6 conductivity-imparting particles having a volume average particle size of 0.5 μm or less with respect to 100 parts by weight of the base resin.
30 to 250 parts by weight of 0 parts by weight and 30 to 250 parts by weight of the surface-roughened particles having a volume average particle size of 2.0 μm or more are mixed, and the second conductive coating is 100 parts by weight of the base resin. A developer carrier, comprising 10 to 60 parts by weight of particles of conductivity-imparting particles having a diameter of 0.5 μm or less. 3. A development for use in a one-component developing device for carrying out non-contact development by transporting a one-component developer to a developing region in a charged state while thinning the one-component developer on a developer carrying member by a developer regulating member. In the agent carrier, a first coating layer made of a conductive paint is provided on the surface of the base material of the developer carrier, and the first coating layer is surface-polished. 5
A developer carrying member comprising a second coating layer made of a conductive coating material which does not contain a particle component exceeding μm.