JP2990013B2 - Developer carrier and developing device using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to electrophotography,
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, as an electrophotographic method, US Pat.
A number of methods are known as described in Japanese Patent Publication No. 297691, Japanese Patent Publication No. 42-23910 and Japanese Patent Publication No. 43-24748, but a photoreceptor made of a photoconductive substance is generally used. Forming an electrical latent image on the photoreceptor by various means, developing the latent image with a developer (toner), and transferring the toner image to a transfer material such as paper as necessary, The image is fixed by heating, pressure, or solvent vapor to obtain a copy.

The developing methods are generally classified into a dry developing method and a wet developing method. However, since the wet developing method involves evaporation of a solvent, it is hardly used at present. In the dry developing method, a two-component developing method such as a magnetic brush developing method mainly using a toner and a carrier has been used for a long time. The disadvantages of the two-component developing method 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 disadvantages, various methods using a one-component developer consisting of only a toner have been proposed. As such a one-component developer, a one-component magnetic developer in which magnetic particles are contained in a high-resistance resin and toner is conveyed by magnetism is used. As a development method using a high-resistance magnetic toner, there is a method in which toner particles are frictionally charged by friction between toner particles, friction between the toner particles and a sleeve, and the like, and developed by contacting the toner particles with an electrostatic latent image holding member. Are known.

However, in these methods, the number of times of contact between the toner particles and the friction member is small and the triboelectric charging is apt to be insufficient, and the charged toner particles are liable to agglomerate the sleeve due to an increased Coulomb force between the sleeve and the sleeve. Has disadvantages.
JP-A-54-43036 proposes a developing method in which the above-mentioned disadvantages are eliminated. This involves applying a very thin coating of magnetic toner on a sleeve, triboelectrically charging it, and then bringing it very close to the electrostatic image under the action of a magnetic field and developing it without contact.

According to this method, the magnetic toner is applied extremely thinly on the sleeve as the developer carrying member, so that the chance of contact between the sleeve and the toner is increased, and sufficient frictional charging is enabled. By supporting the toner and moving the magnet and the toner relatively, the aggregation of the toner particles is dissolved and the toner is sufficiently rubbed with the sleeve. The toner is supported by the magnet and the electrostatic image is formed. An excellent image can be obtained, for example, by developing the toner image while facing the surface without contacting the surface, thereby preventing background fog.

Conventionally, as a developing roller (developing sleeve) generally put into practical use, a metal cylindrical tube made of aluminum, stainless steel, or the like, and a magnet arranged as a magnetic field generating means inside the cylindrical tube are used. 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 of sand blasting, sanding or the like to improve the toner conveying force.

However, in such a sleeve, various inconveniences such as uneven toner coat, poor coat, ghost, and reduced density may occur depending on environmental conditions, toner physical properties, sleeve surface conditions, and the like. For example, as the sleeve rotates repeatedly, the charge amount of the toner coated on the sleeve (tribo)
Becomes too high due to the contact with the sleeve, the toner is attracted by the mirror force of 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 tends to occur particularly under low humidity. When such charge-up occurs, the toner in the upper layer becomes less likely to have a tribo, and the amount of developed toner is reduced, resulting in an image in which a line image is thinned, a solid black image has a low image density, and the like.

Further, since the toner layer forming state of the image area (toner consuming section) and the non-image area change and the charging state changes, the position where a solid image having a high image density is once developed is located next to the developing sleeve. When the halftone image is developed at the developing position during rotation, a phenomenon that 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 quality of electrophotography,
The toner has a small particle size and fine particles. In order to increase the resolution, sharpness and the like and faithfully reproduce a latent image, a toner having a weight average particle diameter of about 6 to 9 μm is generally used. Further, there is a tendency that the fixing temperature of the toner is lowered for the purpose of shortening the first copy time and saving power. In such a situation, the toner is more likely to adhere to the sleeve electrostatically, and the external surface is subjected to a physical force, so that the sleeve surface is more likely to be contaminated and the toner is fused.

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

By using this method, the above phenomenon is greatly reduced. However, when the toner used in the above method 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. As a result, the strength of the resin coating on the sleeve surface decreases, and If used for a period, the resin coating layer on the sleeve surface may be easily scraped or peeled, which may cause a problem.

When a resin film containing a large amount of conductive fine powder, a solid lubricant, etc. in a resin is formed on the surface of a metal cylindrical tube, the charge-imparting property to the toner in a high-temperature, high-humidity environment is reduced. In some cases, the image density becomes insufficient and the image density decreases.

Accordingly, it is an object of the present invention to provide a highly durable developer carrier having stable image quality which does not cause deterioration of the film on the carrier surface due to repeated copying or durability and no peeling. Another object of the present invention is to provide a developer carrier capable of obtaining a high-quality image free from a decrease in density or a sleeve ghost over a long period of time even under different environmental conditions.

Another object of the present invention is to reduce the non-uniform charging of the toner layer on the surface of the developer carrier which occurs when a toner having a small particle diameter is used, and to provide a toner having 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 carrier of the present invention.

[00016]

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

Embedded image (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 ≧
0 represents a real number satisfying n + m ≦ 30. And a one-component developer contained in a developing container, wherein a resin coating layer formed by dispersing and containing the compound represented by the formula (1) and a mixture thereof is formed. While the developer is carried on the developer carrier and the developer layer regulating member forms a thin film of the developer on the developer carrier, and the developer is opposed to the latent image carrier by the developer carrier. And developing the latent image formed on the latent image carrier, wherein the developer carrier of the developing device is disposed on a metal cylindrical tube at least by the general formula (1).
And a pigment treated with a mixture of these compounds and a mixture thereof.

[0017]

The present inventors have conducted intensive studies in order to solve the above-mentioned problems. As a result, the pigments such as conductive fine powder and solid lubricant contained in the resin film on the surface of the carrier were found. The inventors found out that this was one of the main causes of these problems, and examined pigments that could solve these problems.

As a result, the toner easily disperses uniformly in the resin coating on the surface of the carrier, does not reduce the strength of the resin coating, and appropriately adjusts the charge amount of the toner even when used for a long time in different environments. By developing an excellent pigment which can be used, the object of the present invention was achieved by a development carrier using this pigment.

[0019]

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

Embedded image (In the above general formula, X represents> 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 ≧
1, represents a real number satisfying n + m ≦ 30 with m ≧ 0. ) And mixtures thereof.

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

[0021]

Embedded image 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, since the dispersibility in the resin film on the surface of the developer carrier is good, the conductivity of the pigment without lowering the strength of the resin film and the like. It is considered that properties such as lubricity can be imparted to the resin film. Further, since the compound represented by the general formula (1) and a mixture thereof have good charge-providing properties 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
~ 25μm, aluminum, copper, conductive fine powder selected from metal oxides such as metal powder such as silver, metal short fibers, carbon black, titanium oxide, tin oxide, antimony oxide and indium oxide, 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 Colorants such as blue, pigment blue, and phthalocyanine green; abrasives such as strong titanium titanate and cerium oxide; and silica, aluminum oxide, and mixtures thereof can be used.

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

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 to 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 manner is less than 0.1% by weight, the effect of the present invention is hardly obtained, so that the surface of the carrier In addition, the resin film is easily scraped and peeled, and the charge imparting property to the toner in a high-temperature and high-humidity environment is reduced, 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 manner exceeds 20% by weight, the conductivity and the lubricity of the pigment particles are reduced. Since the characteristics cannot be sufficiently exerted, it becomes difficult to properly maintain the charge of the toner on the developer carrying member, and ghosts and density unevenness easily occur particularly in a low-temperature and low-humidity environment.

Examples of the binder resin material in which the pigment is dispersed and contained include, for example, styrene resins, vinyl resins, polyethersulfone resins, polycarbonate resins, polyphenylene oxide resins, polyamide resins,
Thermoplastic resin such as fluororesin, cellulose resin, acrylic resin, etc., 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.
Above all, those with release properties such as silicone resin and fluorine resin, or machines such as polyether sulfone resin, polycarbonate resin, polyphenylene oxide resin, polyamide resin, phenol resin, polyester resin, polyurethane resin and styrene resin Those having excellent mechanical properties are more preferable.

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 cylindrical tube. For the metal cylindrical tube, stainless steel, aluminum or the like is preferably used mainly. The resin coating layer is a mixture of the resin, the compound represented by the general formula (1), and a pigment treated with the mixture thereof.

In the present invention, the ratio (PB ratio) of the binder resin (B) to the pigment (P) is P / B = 1/20 to 5 /
A range of 1 gives particularly favorable results. At a bander amount exceeding 1/20, the effect of adding the pigment is hardly observed, and
When the amount of the pigment is more than / 1, the resin layer becomes very brittle, and the resin layer is greatly scraped and peeled. The thickness of the resin layer is usually preferably 20 μm or less in order to obtain a uniform thickness, but is not particularly limited to this thickness.

Next, a description will be given of a developing device in which the developer carrier of the present invention is incorporated. In FIG. 2, an image carrier that carries an electrostatic latent image formed by a known process, for example, an electrophotographic photosensitive drum 1, is rotated in the direction of arrow B. Sleeve 8 in developing roller 11
Carries a magnetic toner 4 as a one-component magnetic developer supplied by a hopper 3 and rotates in a direction A so that the toner 4 is transferred to a developing section D where the developing sleeve 8 and the photosensitive drum 1 are opposed to each other. Is transported. Developing 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 a metal cylindrical tube 6. Reference numeral 9 denotes a gap indicating that the developing sleeve and the magnet are in a non-contact state.

The toner 4 obtains a triboelectric charge capable of developing the electrostatic latent image on the photosensitive drum 1 by friction with the resin layer 7 on the developing sleeve 8. In order to regulate the layer thickness of the magnetic toner 4 conveyed to the developing section D, a regulating blade 2 made of a ferromagnetic metal is moved from the surface of the developing sleeve to about 100 to 300 μm.
It is suspended from the hopper 3 so as to face the developing sleeve 8 with a gap width of m. When the lines of magnetic force from the magnetic pole N1 of the magnet 5 concentrate on the blade 2, a thin layer of the magnetic toner 4 is formed on the developing sleeve 8. Blade 2
For example, a non-magnetic blade can be used. The thickness of the thin layer of the magnetic toner 4 formed on the developing sleeve 8 is preferably smaller 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 section is equal to or greater than the minimum gap between the developing sleeve 8 and the photosensitive drum 1, that is, a contact type developing device. A power supply 10 applies a developing bias voltage to the developing sleeve 8 to fly the magnetic toner 4, which is a one-component magnetic developer, carried on the developing sleeve 8. When a DC voltage is used as the developing bias voltage, a voltage having a value between the potential of the image portion of the electrostatic latent image (the region where the toner 4 adheres and is visualized) and the potential of the background portion is used. 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 whose direction is alternately reversed in the developing unit D.

In this case, it is preferable that an alternating bias voltage on which a DC voltage component having a value between the potential of the image portion and the potential of the background portion is superimposed is applied to the developing sleeve 8.
Also, in so-called regular development in which toner is attached to a high potential portion of an electrostatic latent image having a high potential portion and a low potential portion to visualize the toner, a 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 attached to a low potential portion of an electrostatic latent image to make it visible, toner that is charged to the same polarity as the polarity of the electrostatic latent image is used. 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 diagram showing a configuration of another embodiment of the developing device of the present invention, and FIG. 4 is a schematic diagram showing a configuration of 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 regulating 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 rotation direction of the developing sleeve 8 in the forward direction, and in FIG. The feature is that the developing sleeve 8 is pressed against the rotating direction of the developing sleeve 8 in the opposite direction.

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

[0036]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples, but the examples do not limit the present invention in any way.
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 an aqueous solution of the compound (4) at a concentration of 93.5 g / l in 10 liters of a 1.4 g / l aqueous solution, and stirred for 1 hour. , And filtered, and dried by heating at 120 ° C to obtain a treated product. At this time, the adsorption amount of the compound (4) to the pigment was 1.1 parts with respect to 100 parts of the pigment.

(Bl): 100 parts of graphite obtained in (Al) 90 parts of phenolic resin 90 parts of methanol 100 parts of isopropyl alcohol 250 parts of zirconia beads having a diameter of 1 mm were added as media particles to the above-mentioned coating material and dispersed in a sand mill for 2 hours. The beads were separated using a sieve and a stock solution was obtained. Further, this stock solution was diluted to a solid content of 25% by weight with isopropyl alcohol to form a coating solution, and a 10-μm-thick film was formed on a stainless-steel carrier base having a diameter of 20 mm by a spray method. The mixture was heated and cured at 30 ° C. for 30 minutes to form a developer carrying member.

Next, the developer carrier obtained in (B1) was
A built-in image output test was performed on a P55 (copier made by Canon Inc.). The following toners were used. Styrene / acrylic resin 100 parts Magnetite 80 parts Negative charge control agent (3,5-di-tert-butylsalicylate chromium complex) 2 parts Low molecular weight polypropylene 3 parts

The above materials are subjected to kneading, pulverization, classification and the like by a general dry toner production method. % Of the toner contained at a ratio of 0.7%. The particle size distribution is measured using a Coulter Counter TA-II
Depends on type. 1.0% of colloidal silica was externally added to this toner.

As a result of the image output test, 23.5 ° C., 60%
Under a normal temperature and normal humidity environment of RH, the image density was as high as 1.41, and a good image free of ghost and density unevenness was obtained. Further, the image density is as high as 1.43 and the ghost level is good under a low-temperature and low-quality environment of 15 ° C. and 10% RH, and the image is also obtained under a high-temperature and high-quality environment of 32.5 ° C. and 85% RH. The density was as high as 1.35, and there was no occurrence of density unevenness and ghost, and the change in image density and image quality was small even under different environmental conditions. Further, the image density was stable even when 100,000 sheets were repeatedly printed under different environmental conditions, and density unevenness and ghost did not cause any 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: .largecircle .: very good, .DELTA..DELTA .: good, .DELTA .: slightly poor, X: very bad.

[0044]

[Table 3] Ghost: .largecircle .: very good, .largecircle .: good, .DELTA .: slightly bad, x: 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). I got At this time, the amount of the compound (5) adsorbed on the graphite was 1.8 parts with respect to 100 parts of the pigment. (B2): In Example 1 (B1), 100 parts of the graphite obtained in (A1) was replaced with the graphite 10 obtained in (A2).
A developer carrying member was prepared in the same manner as in Example 1 except that the amount was changed to 0, and the same copying was performed. As a result, good results were obtained as in Example 1.

Example 3 (A3): The compound (1) was used in place of the compound (4).
A treated graphite product was obtained in the same manner as in Example 1 (A1) except that the 4.5 g / liter aqueous solution of 0) was used. At this time, the amount of the compound (10) adsorbed on the 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 the graphite 10 obtained in (A3).
A developer carrying member was prepared in the same manner as in Example 1 except that the amount was changed to 0, and the same copying was performed. As a result, good results were obtained as in Example 1.

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

Example 5 (A5): In Example 1 (A1), the average particle size was 7 μm.
Average particle size 0.03μ instead of 100 parts of graphite
The treatment was carried out by (A5) in the same manner as in Example 1, except that 750 parts of carbon black of m and 50 parts of boron nitride having an average particle size of 4 μm were used. (B5): Example 1 In (B1), developer was carried out in the same manner as in Example 1 except that 100 parts of the graphite obtained in (A1) was 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 used as it was, and the same copying was performed. 5
Image density is 1.14 under high temperature and high humidity environment of 85 ° C and 85% RH
Was low. Further, if the repeated copying of 100,000 sheets is continued, peeling and abrasion of the resin film on the surface of the developer carrying member occur, the density unevenness and the ghost are deteriorated, and the image density decrease particularly in a low temperature and low humidity environment becomes remarkable, Initial concentration 1.
42 decreased to 1.20 after 100,000 copies.

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 performed. As a result, as in Comparative Example 1, good results were not obtained.

Comparative Examples 3 and 4 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) in Comparative Example 1, and the same copying was performed. Although the peeling and scraping of the resin coating layer due to durability have been 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]

According to the present invention, a developer carrier having a resin coating layer in which a pigment is dispersed according to the present invention has a high image density over a long period of time without causing deterioration or peeling of the coating layer due to repeated copying or durability. And a high-quality image free from density unevenness and ghost. Further, even under different environmental conditions, the change in image density is small.
A high-quality image can be maintained without occurrence of density reduction, density unevenness, ghost, or the like due to the increase.

[0053]

[Brief description of the 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 view of a developing device having a developer carrier having a resin film formed thereon according to the present invention.

FIG. 3 is a view showing a developing device having a developer carrier on which a resin film according to the present invention is formed and having a different type of developer layer regulating member.

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

[0054]

[Description 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: developing sleeve 9: void 10: Developing bias power supply 11: developing roller 12: developing roller 13: developing sleeve 20: elastic regulating blade 21: elastic regulating blade N1, S1, N2, S2: magnetic pole

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Fujishima 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Kazuki Saiki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon (56) References JP-A-3-279982 (JP, A) JP-A-3-192377 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G03G 15/08 G03G 9/00

Claims (2)

(57) [Claims] A metal cylindrical tubular developer carrier used in a developing device for developing a latent image formed on the latent image carrier with a developer carried and transported by the developer carrier; On a cylindrical tube, at least the following general formula (1): (In the above general formula, X represents> 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 ≧
1, represents a real number satisfying n + m ≦ 30 with m ≧ 0. A) a resin coating layer formed by dispersing and containing a compound treated with the compound represented by the formula (1) or a mixture thereof; 2. A developer carrying a one-component developer contained in a developing container on a developer carrier and forming a thin film of the developer on the developer carrier by a developer layer regulating member. In a developing device that transports the developer to a developing unit facing the latent image carrier by the carrier and develops 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 represents> 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 ≧
1, represents a real number satisfying n + m ≦ 30 with m ≧ 0. A) a developer carrier having a resin coating layer which contains a pigment treated with the compound represented by the formula (1) and a mixture thereof.