JPH07295364A - Developer carrier and developing device using the same - Google Patents

Abstract

PURPOSE:To obtain a carrier body having high durability which does not cause deterioration or peeling of the coating film on the surface of the carrier body when the body is repeatedly used for copying or under severe conditions, and to obtain high quality images with high durability which does not cause reduction of density or sleeve ghost, etc., for a long time even under various environmental conditions by forming a specified resin coating film layer on a metal cylinder to constitute the developer carrier. CONSTITUTION:This metal cylindrical developer carrier body is used in the developing device to develop a latent image formed on a latent image holding body with a developer carried by a developer carrier body. The carrier body has a resin coating layer containing dispersion of a pigment treated with a compd. expressed by the formula or a mixture of these compds. In the formula, X is >CH2 or >C=O, R is an alkyl group or alkenyl group having 6-24C which may have hydroxyl groups as substituents, and (n) and (m) are real numbers satisfying n>=1, m>=0, and n+m<=30. As a result, the pigment can be uniformly dispersed in the resin coating film on the surface of the carrier body so that characteristics of the pigment can be added to the carrier body without decreasing the strength of the coating film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a developer carrier for developing and visualizing a latent image formed on a latent image carrier such as an electrophotographic photosensitive member or an electrostatic recording dielectric, and a developing device using the developer carrier.

[0002]

2. Description of the Related Art Conventionally, US Pat. No. 2 has been used as an electrophotographic method.
As described in Japanese Patent Publication No. 297691, Japanese Patent Publication No. 42-23910 and Japanese Patent Publication No. 43-24748, many methods are known, but generally, a photoconductor made of a photoconductive substance is used. After forming an electric latent image on the photoreceptor by various means, then developing the latent image with a developer (toner), and after transferring the toner image to a transfer material such as paper, if necessary, A copy is obtained by fixing with heat, pressure or solvent vapor.

The developing method is generally classified into a dry developing method and a wet developing method, but the wet developing method is hardly used at present because of the solvent evaporation. In the dry developing method, a two-component developing method such as a magnetic brush developing method mainly containing toner and carrier has been used for a long time. The disadvantages of the two-component developing method in the past are that it is difficult to keep the mixing ratio of the toner and the carrier constant, and that the carrier deteriorates quickly and the developer must be replaced frequently.

In order to avoid such drawbacks, various methods using a one-component developer consisting of only toner have been proposed. As such a one-component developer, a one-component magnetic developer in which magnetic particles are contained in a high-resistive resin and the toner is conveyed by magnetism is used. As a developing method using a high resistance magnetic toner, there is a method in which toner particles are triboelectrically charged by friction between the toner particles, friction between the toner particles and a sleeve, and the like, and the toner particles are brought into contact with an electrostatic latent image holding member to develop. Are known.

However, according to these methods, the number of contact between the toner particles and the friction member is small and triboelectric charging is apt to be insufficient, and the charged toner particles are apt to aggregate due to the increased Coulomb force between the toner particles and the sleeve. It has drawbacks.
Japanese Unexamined Patent Publication No. 54-43036 proposes a developing method which eliminates the above-mentioned drawbacks. This involves applying a very thin coating of magnetic toner on a sleeve, tribocharging it, then bringing it very close to the electrostatic image under the action of a magnetic field, and developing it in opposition without contact.

According to this method, the magnetic toner is applied very thinly on the sleeve as the developer carrying member to increase the chances of contact between the sleeve and the toner, thereby enabling sufficient triboelectrification. By supporting the toner and moving the magnet and toner relatively, the toner particles are disaggregated and sufficiently rubbed against the sleeve, the toner is supported by the magnet, and the electrostatic image It is possible to obtain an excellent image by, for example, preventing the background fog by developing by facing each other without making contact with.

Conventionally, as a developing roller (developing sleeve) which has been generally put into practical use, a cylindrical metal tube made of aluminum, stainless steel or the like, and a magnet as a magnetic field generating means arranged inside the cylindrical tube. It is used. The magnet is often used in the form of a magnet roll. The surface of the metal cylindrical tube is often used in a state in which unevenness is appropriately formed by means such as sand blasting or sanding to improve the toner carrying force.

However, in such a sleeve, various problems such as toner coat unevenness, poor coat, ghost, and density decrease may occur depending on environmental conditions, toner physical properties, sleeve surface conditions, and the like. For example, as the sleeve rotates repeatedly, the amount of charge on the toner coated on the sleeve (tribo)
Becomes too high due to the contact with the sleeve, the toner attracts due to the mirror image force with the sleeve surface, becomes immobile on the sleeve surface, and does not move from the sleeve to the latent image on the latent image holding member (drum). The charge-up phenomenon is likely to occur especially in low humidity. When such a charge-up occurs, the toner in the upper layer is less likely to have tribo, and the developing amount of the toner is reduced, resulting in an image in which the line image is thinned or the image density of a solid black image is reduced.

Further, since the toner layer forming state of the image portion (toner consuming portion) and the non-image portion are different and the charging state is different, the position where the solid image having a high image density is once developed is next to the developing sleeve. When a halftone image is developed by coming to the developing position during rotation, a phenomenon that a trace of a solid image appears on the image, that is, a so-called sleeve ghost phenomenon is likely to occur.

Recently, in order to improve the image quality of electrophotography,
The toner has a small particle size and fine particles. In order to increase resolution and sharpness and faithfully reproduce a latent image, it is general to use a toner having a weight average particle diameter of about 6 to 9 μm. Furthermore, the fixing temperature of the toner tends to be lowered for the purpose of shortening the first copy time and saving power. In such a situation, the toner is more likely to electrostatically adhere to the sleeve, and the physical force from the outside is applied, so that the surface of the sleeve is apt to be contaminated or the toner is fused.

As a method for solving such a phenomenon, instead of the conventional sleeve of a metal cylindrical tube, Japanese Patent Laid-Open No. 2-105
No. 181, JP-A-3-36570, etc., there is a proposal of a method of forming a resin coating film made of resin, conductive fine powder, solid lubricant, etc. on the surface of a metal cylindrical tube and using it in a developing device. Has been done.

By using this method, the above phenomenon is significantly reduced. However, in the above method, when the toner used is particularly likely to be charged up,
A resin coating containing a large amount of conductive fine powder, solid lubricant, etc. in the resin must be formed on the surface of the metal cylindrical tube, and as a result, the resin coating strength on the sleeve surface decreases and If it is used for a period of time, the resin coating layer on the surface of the sleeve may be easily scraped or peeled off, which may cause a problem.

Further, when a resin coating film containing a large amount of conductive fine powder, solid lubricant, etc. in the resin is formed on the surface of the metal cylindrical tube, the toner is not easily charged with electricity in a high temperature and high humidity environment. There is a case where it becomes insufficient and the image density is lowered.

Accordingly, an object of the present invention is to provide a highly durable developer carrier having stable image quality without deterioration of the coating film on the surface of the carrier or peeling off due to repeated copying or durability. Another object of the present invention is to provide a developer carrying member capable of obtaining a high-quality image in which density reduction or sleeve ghost does not occur for a long period of time even under different environmental conditions.

Another object of the present invention is to reduce uneven charging of the toner layer on the surface of the developer carrier, which appears when a toner having a small particle size is used, and to provide a toner with an appropriate charge amount. It is to provide an agent carrier. Another object of the present invention is to provide a stable and high-quality image by an electrophotographic apparatus using a developing device constituted by using the developer carrying member of the present invention.

[00016]

The above object can be achieved by the present invention described below. That is, the present invention provides a metal cylindrical tubular developer carrier used in a developing device for developing a latent image formed on a latent image carrier with a developer carried and conveyed by a developer carrier. On the metal cylindrical tube, at least the following general formula (1):

[Chemical 3] (In the above general formula, X is> CH ₂ or> C = 0, R is an alkyl group or an alkenyl group which may have a hydroxyl group having 6 to 24 carbon atoms as a substituent, n and m are n ≧ 1, m ≧
When 0, it represents a real number such that n + m ≦ 30. ), A developer carrier having a resin coating layer formed by dispersing and containing a pigment treated with a compound represented by the formula (1) and a mixture thereof, and a one-component developer housed in a developing container. On the developer carrier to form a thin film of the developer on the developer carrier by the developer layer regulating member, while developing the developer with the developer carrier facing the latent image carrier. In a developing device that conveys the latent image formed on the latent image bearing member to a developing unit, the developer bearing member of the developing device is disposed on the metal cylindrical tube at least in the general formula (1).
The developing device is a developer carrying member having a resin coating layer containing a pigment treated with a compound represented by and a mixture thereof.

[0017]

The inventors of the present invention have conducted extensive studies in order to solve the above-mentioned problems, and as a result, found that conductive fine powder, pigment such as solid lubricant contained in the resin coating on the surface of the carrier was Ascertaining that it is one of the main causes of these problems, we investigated pigments that can solve these problems.

As a result, the toner is easily dispersed uniformly in the resin coating on the surface of the carrier, the strength of the resin coating is not lowered, and the charge amount of the toner is properly adjusted even when used for a long period of time in different environments. An excellent pigment that can be used has been developed, and the object of the present invention has been achieved by a development carrier using this pigment.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the preferred embodiments. First, the pigment used in the present invention will be described. The pigment used in the present invention is represented by the following general formula (1)

[Chemical 4] (In the above general formula, X is> CH ₂ or> C = 0,
R has 6 to 6 carbon atoms which may have a hydroxyl group as a substituent.
24 alkyl groups or alkenyl groups, n and m are n ≧
It represents a real number such that 1, m ≧ 0 and n + m ≦ 30. ) Has been treated with a compound represented by the formula (1) and a mixture thereof.

These compounds are composed of an alkyl group as a hydrophobic group, an ether bond as a hydrophilic group, an amino group and a hydroxyl group. Specifically, the following compounds may be mentioned.

[0021]

[Chemical 5] In the above compounds, the number of additions of ethylene oxide shows an average value.

The pigment used in the present invention has the general formula (1):
Since it is treated with the compound represented by and a mixture thereof, the dispersibility in the resin coating on the surface of the developer carrier is good, and therefore the conductivity of the pigment and the conductivity of the pigment can be reduced without lowering the strength of the resin coating. It is considered possible to impart properties such as lubricity to the resin coating. Further, since the compound represented by the general formula (1) and the mixture thereof have good charge imparting property to the toner, the developer carrying member of the present invention has a sufficient charge even under a high temperature and high humidity environment. It is believed that an amount can be imparted to the toner.

The pigment used in the present invention has a particle size of 0.01 μm to 50 μm, preferably 0.01 μm.
Conductive fine powder selected from metal powders such as aluminum, copper and silver, metal short fibers, carbon black, titanium oxide, tin oxide, antimony oxide and indium oxide and the like, graphite, Solid lubricants such as molybdenum disulfide, boron nitride and zinc stearate, alloys and compounds such as magnetite, hematite, ferrite, iron, cobalt and nickel, magnetic powders such as other ferromagnetic alloys, rhodamine FB, rhodamine B lake, phthalocyanine Coloring agents such as blue, pigment blue, phthalocyanine green, etc., strong agents such as strong titanium titanate, cerium oxide, etc., as well as silica, aluminum oxide or mixtures thereof can be used.

As a specific method for producing the pigment used in the present invention, the compound represented by the general formula (1) used in the present invention and a mixture thereof are added to the pigment, and then the Henschel mixer or fret mill is used. In the dry method, the compound represented by the general formula (1) used in the present invention, the mixture thereof and the pigment are dispersed in water or an organic solvent to give the pigment of the general formula (1). Various methods such as a wet method of adsorbing the compound represented by and a mixture thereof and then filtering and drying are exemplified.

The content of the compound of the general formula (1) and the mixture thereof in the pigment particles thus treated is 0.1 to 20% by weight, preferably 0.5% by weight based on the amount of the pigment.
10% by weight is good. When the content of the compound of the general formula (1) and the mixture thereof in the pigment particles treated in this way is less than 0.1% by weight, the effect of the present invention is difficult to obtain, and therefore the surface of the carrier The abrasion and peeling of the resin coating are likely to occur, and the charge imparting property to the toner is deteriorated in a high temperature and high humidity environment, and the image density is easily reduced.

On the other hand, when the content of the compound of the general formula (1) and the mixture thereof in the pigment particles treated in this way exceeds 20% by weight, the conductivity and lubricity of the pigment particles may be reduced. Since the characteristics cannot be sufficiently exerted, it becomes difficult to favorably retain the charge of the toner on the developer carrying member, and ghost and density unevenness are likely to occur particularly in a low temperature and low humidity environment.

Examples of the binder resin material in which the above pigment is dispersed and contained include, for example, styrene resins, vinyl resins, polyether sulfone resins, polycarbonate resins, polyphenylene oxide resins, polyamide resins,
Thermoplastic resin such as fluororesin, fibrous resin, acrylic resin, epoxy resin, polyester resin, alkyd resin, phenol resin, melamine resin, polyurethane resin, urea resin, silicone resin, polyimide resin, etc. Can use a photocurable resin or the like.
Machines such as those having releasability such as silicone resin and fluorine resin, or polyether sulfone resin, polycarbonate resin, polyphenylene oxide resin, polyamide resin, phenol resin, polyester resin, polyurethane resin, styrene resin More preferable are those having excellent physical properties.

Next, the structure of the developer carrying member used in the present invention will be described. The developer carrier comprises a metal cylindrical tube and a resin layer surrounding and covering the metal cylindrical tube. As the metal cylindrical tube, stainless steel, aluminum or the like is preferably used. The resin coating layer is a mixture of the resin, the compound represented by the general formula (1) and a mixture thereof, which is treated with a pigment.

The ratio (PB ratio) of the binder resin (B) and the pigment (P) in the present invention is P / B = 1/20 to 5 /
A range of 1 gives particularly favorable results. When the amount of bander exceeds 1/20, almost no effect of pigment addition is seen.
If the amount of the pigment exceeds / 1, the resin layer becomes very brittle and the resin layer is abraded and peeled off severely. The film thickness of the resin layer is usually preferably 20 μm or less in order to obtain a uniform film thickness, but is not particularly limited to this film thickness.

Next, a developing device incorporating the developer carrying member of the present invention will be described and exemplified. In FIG. 2, an image carrier that carries an electrostatic latent image formed by a known process, for example, the electrophotographic photosensitive drum 1 is rotated in the direction of arrow B. Sleeve 8 in developing roller 11
Holds the magnetic toner 4 as the one-component magnetic developer supplied by the hopper 3 and rotates in the direction of arrow A, so that the toner 4 is transferred to the developing portion D where the developing sleeve 8 and the photosensitive drum 1 face each other. To transport. Development sleeve 8
Inside, a magnet 5 is arranged to magnetically attract and hold the magnetic toner 4 on the developing sleeve 8. The developing sleeve 8 has a resin layer 7 coated on the metal cylindrical tube 6. Reference numeral 9 is a gap indicating that the developing sleeve and the magnet are not in contact with each other.

By friction with the resin layer 7 on the developing sleeve 8, the toner 4 obtains triboelectric charge capable of developing the electrostatic latent image on the photosensitive drum 1. In order to regulate the layer thickness of the magnetic toner 4 conveyed to the developing section D, the regulating blade 2 made of a ferromagnetic metal is provided with a thickness of about 100 to 300 μm from the surface of the developing sleeve.
It is suspended from the hopper 3 so as to face the developing sleeve 8 with a gap width of m. Magnetic lines of force from the magnetic pole N1 of the magnet 5 concentrate on the blade 2 to form a thin layer of the magnetic toner 4 on the developing sleeve 8. Blade 2
It is also possible to use a non-magnetic blade. The thin layer of the magnetic toner 4 formed on the developing sleeve 8 is preferably thinner than the minimum gap between the developing sleeve 8 and the photosensitive drum 1 in the developing section D.

The present invention is particularly effective for a developing device of the type that develops an electrostatic latent image with such a thin toner layer, that is, a non-contact type developing device. However, the present invention can also be applied to a developing device in which the thickness of the toner layer in the developing portion is equal to or larger than the minimum gap between the developing sleeve 8 and the photosensitive drum 1, that is, a contact type developing device. A developing bias voltage is applied to the developing sleeve 8 by the power source 10 in order to fly the magnetic toner 4 which is the one-component magnetic developer carried on the developing sleeve 8. When a direct current voltage is used as the developing bias voltage, a voltage having a value between the potential of the image portion (the area where the toner 4 is adhered and visualized) of the electrostatic latent image and the potential of the background portion is the developing sleeve. 8 is preferably applied. On the other hand, in order to increase the density of the developed image or improve the gradation, an alternating bias voltage may be applied to the developing sleeve 8 to form an oscillating electric field in which the direction is alternately reversed in the developing portion D.

In this case, it is preferable to apply to the developing sleeve 8 an alternating bias voltage in which a DC voltage component having a value between the potential of the image portion and the potential of the background portion is superimposed.
Further, in so-called normal development in which toner is visualized by adhering toner to a high potential portion of an electrostatic latent image having a high potential portion and a low potential portion, toner charged to a polarity opposite to the polarity of the electrostatic latent image is used, On the other hand, in so-called reversal development in which toner is visualized by adhering toner to the low potential portion of the electrostatic latent image, the toner used is charged to the same polarity as the polarity of the electrostatic latent image. The high potential and the low potential are expressed by absolute values. In any case, the toner 4 is charged by friction with the developing sleeve 8.

FIG. 3 is a schematic configuration diagram showing another embodiment of the developing device of the present invention, and FIG. 4 is a schematic configuration diagram showing still another embodiment of the developing device of the present invention. In the developing device shown in FIGS. 3 and 4, as a member for controlling the layer thickness of the magnetic toner 4 on the developing sleeve 8, a material having rubber elasticity such as urethane rubber or silicon rubber, or a metal such as phosphor bronze or stainless steel is used. Elastic plates 20 and 21 made of an elastic material or the like are used. In FIG. 3, the elastic plate 20 is pressed against the developing sleeve 8 in the direction of rotation and in the forward direction, and in FIG. The feature is that the developing sleeve 8 is pressed in the opposite direction to the rotating direction.

The developing device of FIGS. 3 and 4 and other basic structures are the same as those of the developing device shown in FIG. 2, and the same reference numerals indicate basically the same members. 2 to 4 are merely schematic examples, and it goes without saying that there are various forms such as the shape of the container, the presence / absence of the stirring member, and the arrangement of the magnetic poles. Of course, it can also be used as a two-component developing device using carrier particles.

[0036]

EXAMPLES The present invention will now be described in detail with reference to examples, but the examples do not limit the present invention.
All parts in the examples are parts by weight. Example 1 (Al): Graphite having an average particle size of 7 μm was added to 10 liters of a 1.4 g / liter aqueous solution of the compound (4) so that the slurry concentration was 93.5 g / liter, and the mixture was stirred for 1 hour. , Filtered, and dried by heating at 120 ° C. to obtain a treated product. At this time, the amount of the compound (4) adsorbed to the pigment was 1.1 parts with respect to 100 parts of the pigment.

(Bl): Graphite obtained in (Al) 100 parts Phenolic resin 90 parts Methanol 100 parts Isopropyl alcohol 250 parts Zirconia beads having a diameter of 1 mm are added as media particles to the above coating material and dispersed in a sand mill for 2 hours. The beads were separated using a sieve to obtain a stock solution. Further, this stock solution is diluted with isopropyl alcohol to a solid content of 25% by weight to obtain a coating solution, and a coating film having a thickness of 10 μm is formed on a stainless steel carrier substrate having a diameter of 20 mm by a spray method. A developer carrying member was prepared by heating at 30 ° C. for 30 minutes for curing.

Next, the developer carrying member obtained in (B1)
An image drawing test was carried out by incorporating it into P55 (Canon Copier). The following toner was used. Styrene / acrylic resin 100 parts Magnetite 80 parts Negative charge control agent (3,5-di-tertiary butylsalicylic acid chromium complex) 2 parts Low molecular weight polypropylene 3 parts

The above-mentioned materials are kneaded, pulverized and classified by a general dry toner manufacturing method, and the average particle diameter is 7.5 μm, the particle diameter is 4 μm or less is 16%, and the weight is 12.7 μm or more. %, And the content of the toner is 0.7%. Coulter counter TA-II for particle size distribution measurement
It depends on the type. 1.0% of colloidal silica was externally added to this toner and used.

As a result of the image output test, 23.5 ° C., 60%
In a room temperature and normal humidity environment of RH, the image density was as high as 1.41 and a good image without ghost and density unevenness was obtained. Further, the image density is as high as 1.43 in the low temperature and low quality environment of 15 ° C. and 10% RH, and the ghost level is also good, and the image is also in the high temperature and high quality environment of 32.5 ° C. and 85% RH. The density was as high as 1.35, there was no density unevenness and ghost, and the variation in image density and image quality was small even under different environmental conditions. Furthermore, under different environmental conditions, the image density was stable even after repeated copying of 100,000 sheets, and uneven density and ghost did not pose a problem. The above results are shown in Tables 1 to 3 together with the results of other examples and comparative examples.

[0042]

[Table 1]

[0043]

[Table 2] Density unevenness: ◯: Very good, ◯ Δ: Good, Δ: Slightly bad, ×: Very bad.

[0044]

[Table 3] Ghost: ・ ○: Very good, ○ △: Good, △: Slightly bad, ×: Very bad.

Example 2 (A2): A treated product of graphite in the same manner as in Example 1 (A1) except that a 2.0 g / liter aqueous solution of the compound (5) was used instead of the compound (4). Got At this time, the amount of the compound (5) adsorbed to graphite was 1.8 parts with respect to 100 parts of the pigment. (B2): 100 parts of the graphite obtained in (A1) in Example 1 (B1) was replaced with graphite 10 obtained in (A2).
A developer carrying member was prepared in the same manner as in Example 1 except that 0 parts were replaced, and the same copying was carried out. As a result, good results were obtained as in Example 1.

Example 3 (A3): Instead of the compound (4), the compound (1)
A graphite-treated product was obtained in the same manner as in Example 1 (A1) except that the aqueous solution of 4.5 g / liter of 0) was used. At this time, the amount of the compound (10) adsorbed to graphite was 4.2 parts with respect to 100 parts of the pigment. (B3): In Example 1 (B1), 100 parts of the graphite obtained in (A1) was replaced with graphite 10 obtained in (A3).
A developer carrying member was prepared in the same manner as in Example 1 except that 0 parts were replaced, and the same copying was carried out. As a result, good results were obtained as in Example 1.

Example 4 (A4): The average particle size is 7 μm in Example 1 (A1).
Average particle size of 0.03μ instead of 100 parts of graphite
The treatment was carried out by the method (A4) in the same manner as in Example 1 except that 100 parts of m carbon black was used. (B4): Developer in the same manner as in Example 1 except that 100 parts of the graphite obtained in (A1) in Example 1 (B1) is replaced with 100 parts of the carbon black obtained in (A4). After making a carrier and making a similar copy,
Good results were obtained as in Example 1.

Example 5 (A5): In Example 1 (A1), the average particle size is 7 μm.
Average particle size of 0.03μ instead of 100 parts of graphite
m of carbon black and 750 parts of boron nitride having an average particle diameter of 4 μm were used, and the treatment (A5) was performed in the same manner as in Example 1. (B5): In the same manner as in Example 1 except that 100 parts of the graphite obtained in (A1) in Example 1 (B1) is replaced with 100 parts of the pigment obtained in (A5). When a body was prepared and the same copying was performed, good results were obtained as in Example 1.

Comparative Example 1 A developer carrying member was prepared in the same manner as in Example 1 except that the graphite pigment used in Example 1 was not treated and was used as it was. 5
Image density is 1.14 under high temperature and high humidity environment of ℃ and 85% RH.
Was low. Further, when repeated copying of 100,000 sheets is continued, peeling damage and abrasion of the resin coating on the surface of the developer carrier occur, density unevenness and ghost are worsened, and image density reduction particularly under low temperature and low humidity environment becomes remarkable, Initial concentration 1.
42 dropped to 100 after 100,000 sheets.

Comparative Example 2 The carbon black pigment used in Example 4 was not treated,
A developer carrying member was prepared in the same manner as in Example 4 except that it was used as it was, and the same copying was carried out. As a result, the same good results as in Comparative Example 1 were not obtained.

Comparative Examples 3 to 4 In Comparative Example 1, a developing carrier was prepared in which the amount of the graphite pigment was 60 parts (Comparative Example 3) and 30 parts (Comparative Example 4), and the same copying was performed. Although the peeling damage and scraping of the resin coating layer due to durability were reduced,
In particular, under low temperature and low humidity environment conditions, density unevenness caused by toner coating unevenness due to charge-up occurs, and ghost deterioration and image density decrease occur.

[0052]

The developer carrying member having the resin coating layer in which the pigment according to the present invention is dispersed does not cause deterioration of the coating layer or peeling due to repeated copying or durability, and has a high image density over a long period of time. A high-quality image without density unevenness and ghost can be obtained. In addition, the change in image density is small even under different environmental conditions, and the proper toner charge is maintained even under low temperature and low humidity environmental conditions, and the charge
It is possible to maintain a high-quality image without causing density deterioration, density unevenness, ghost, and the like due to up.

[0053]

[Brief description of drawings]

FIG. 1 is a schematic view of a conventional developing device having a developing roller on which a resin film is not formed.

FIG. 2 is a schematic diagram of a developing device having a developer carrying member on which a resin coating according to the present invention is formed.

FIG. 3 is a diagram showing a developing device having a developer carrier having a resin film according to the present invention and different types of developer layer regulating members.

FIG. 4 is a diagram showing a developing device of a type having a developer carrying member on which a resin film according to the present invention is formed and having a different developer layer regulating member.

[0054]

[Explanation of sign]

 1: Photosensitive drum (electrostatic latent image carrier) 2: Magnetic regulation blade 3: Container 4: Developer (toner) 5: Magnet roll 6: Metal cylindrical tube 7: Resin coating layer 8: Development sleeve 9: Void 10: Developing bias power source 11: Developing roller 12: Developing roller 13: Developing sleeve 20: Elasticity regulating blade 21: Elasticity regulating blade N1, S1, N2, S2: Magnetic pole

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Kenji Fujishima, Kenji Fujishima, 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Ikki Saiki, 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Within the corporation

Claims (2)

[Claims] 1. A metal cylindrical tubular developer carrier used in a developing device for developing a latent image formed on a latent image carrier with a developer carried and conveyed by a developer carrier. On a cylindrical tube, at least the following general formula (1): (In the above general formula, X is> CH ₂ or> C = 0,
R has 6 to 6 carbon atoms which may have a hydroxyl group as a substituent.
24 alkyl groups or alkenyl groups, n and m are n ≧
It represents a real number such that 1, m ≧ 0 and n + m ≦ 30. And a pigment coated with a mixture of these compounds is dispersed to form a resin coating layer, which is a developer carrier. 2. The one-component developer housed in a developing container is carried on a developer carrier, and the developer layer regulating member forms a thin film of the developer on the developer carrier, while the developer is formed. In a developing device that conveys the developer to a developing unit facing the latent image carrier by the carrier to develop the latent image formed on the latent image carrier, the developer carrier of the developing device is , On a metal cylindrical tube, at least the following general formula (1): (In the above general formula, X is> CH ₂ or> C = 0,
R has 6 to 6 carbon atoms which may have a hydroxyl group as a substituent.
24 alkyl groups or alkenyl groups, n and m are n ≧
It represents a real number such that 1, m ≧ 0 and n + m ≦ 30. ) A developing device comprising a developer carrier having a resin coating layer containing a pigment treated with a compound represented by the formula (4) and a mixture thereof.