JPH07306586A - One-component developing device - Google Patents

Abstract

PURPOSE:To form proper surface roughness on a developer carrier of a developing device for obtaining a proper carried developer quantity and to sufficiently triboelectrify a one-component developer for obtaining a desired image density. CONSTITUTION:The developing device 3 is provided with the developer carrier 4 provided opposite to an electrostatic latent image holder 1 and sticking the one-component developer 6 on the surface, to carry the developer 6 and a developer regulating member 10 regulating the quantity of the developer stuck on a carrier surface layer 4b consisting essentially of resin having the dispersed inorganic compound grains, to regulate the developer to a thin layer. The developer 6 having a charge on the surface of the carrier 4 is stuck to an electrostatic latent image 4 on the holder 1 to make it visualizable in an electric field generated in a developing area A where the carrier 4 and holder 1 face and approach each other. The inorganic compound grains 8 and 9 are composed of different grains of two or more kinds of grain diameter ranges and for instance, it is preferable that the diameter of the first grain 8 is 1-20mum and the diameter of the second grain in 9 is 5-100nm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-component developing device which is incorporated in an image forming apparatus such as an electrophotographic copying machine or a printer to make a developer adhere to an electrostatic latent image for visualization, and more particularly to an electrostatic latent image. The present invention relates to a one-component developing device that develops an electrostatic latent image by causing a one-component developer to fly in an oscillating electric field generated between a holder and a developer carrier.

[0002]

2. Description of the Related Art As a developing device for developing an electrostatic latent image formed on an electrostatic latent image holding member to form a visible image, various types have been conventionally used depending on the type of developer used. Are known. For example, the following techniques are conventionally known. (J01) Technology disclosed in U.S. Pat. No. 2,895,847 This patent specification describes transfer development using a developer carrying member called a "donor". In the transfer development described therein, (1) when the toner layer, which is the developer, is not in contact with the photoconductor, and the toner flies in the gap between them, (2) the toner layer is in rotary contact with the photoconductor. If you do
(3) This is a general term for development including the case where the toner layer is in rotary contact with the photoconductor and slips on the image portion, and is also well known as the "touch-down development method". The following techniques are conventionally known as a one-component developing device employing the touch-down developing method.

(J02) Technology shown in FIG. 3 FIG. 3 shows a conventional developing device using a magnetic one-component developer, for example, JP-A-54-51848 and JP-A-58.
-146249, U.S. Pat. No. 3,372,675
FIG. 3 is a sectional view of the developing device disclosed in Japanese Patent No. 3,426,730 and the like. In FIG. 3, the developing device 01 includes a hopper 03 that stores a magnetic one-component developer 02, a cylindrical developer carrier 05 that is rotatably supported around a plurality of magnet rolls 04, and a developing device at the tip. A developer regulating member 07 to which an elastic member 06 such as rubber that rubs the surface of the agent carrier 05 is attached. A high voltage AC power supply 08 and a DC power supply 09 are connected to the developer carrier 05. Further, the electrostatic latent image holding member 010 arranged facing the developing device 01 has a photoconductive layer on the electrode,
After being uniformly charged, an electrostatic latent image 011 is formed by irradiating with image light.

In the conventional developing device 01 shown in FIG. 3, the magnetic one-component developer 02 housed in the hopper 03 is used.
Is attracted onto the developer carrying member 05 by the magnetic force of the magnet roll 04 and rubs against the surface of the developer carrying member 05 when passing through between the developer regulating member 07. This allows
The adhered amount of the developer 02 on the developer carrier 05 is regulated, and the developer 02 is thinned and electrostatic charge is imparted. The developer 0 thinned by the developer regulating member 07
Reference numeral 2 denotes a development area A ′ in which the electrostatic latent image carrier 010 and the developer carrier 05 are close to each other as the developer carrier 05 rotates.
Be transported to. The developer carrier 05 has a high-voltage AC power source 0
8 and the DC superimposed AC voltage are applied from the DC power supply 09, the oscillating electric field generated in the developing area A ′ causes
The developer 02 having an electrostatic charge on the surface of the developer carrier 05 flies to the electrostatic latent image 011 on the electrostatic latent image holder 010 to visualize the electrostatic latent image 011.

(J03) Technique shown in FIG. 4 FIG. 4 is a cross-sectional view of a conventional developing device using a non-magnetic one-component developer, for example, the developing device disclosed in JP-A-60-53975. Is. In FIG. 4, FIG.
For convenience, the same members are designated by the same reference numerals. In FIG. 4, a non-magnetic one-component developer 012 is stored in the hopper 03 of the developing device 01, and the developer 012 is a supply roll 013 that rotates in the opposite direction at the same peripheral speed as the developer carrier 05. Is supplied to the developer carrier 05. A developer regulating member 07 is provided so as to come into contact with the developer carrier 05 with a predetermined pressure contact force, and the developer 012 supplied to the developer carrier 05 is accompanied by rotation of the developer carrier 05. And is conveyed to the developer regulating member 07. Here, the developer 012 to which the developer adhesion amount is regulated to form a uniform thin layer and the electrostatic charge is applied is further added to the electrostatic latent image holding member 010.
And the developer carrying member 05 are conveyed to the developing area A'which is adjacent to each other. A DC superimposed AC voltage is applied to the developer carrying member 05 from the high voltage AC power supply 08 and the DC power supply 09, and the developer is supported by the oscillating electric field generated in the gap between the electrostatic latent image holding member 010 and the developer carrying member 05. 012 is an electrostatic latent image carrier 0
The electrostatic latent image 011 is visualized by flying to 10.

Next, the developer carrier used in the developing device described in (J02) and (J03) will be described. In the conventional one-component developing device, the developer carrier is a coating of a binder resin and a solvent in which an electric resistance control agent and a reinforcing agent are dispersed on the surface of a cylindrical conductive substrate such as aluminum or stainless steel. A sleeve coated with a liquid to form a semiconductive resin layer is used. Examples of the electric resistance control agent include carbon black, barium sulfate, titania, potassium titanate (K ₂
O.6TiO ₂ ) or the like is used, and as the reinforcing agent, an inorganic compound such as silica, titania, or alumina is often used. Alternatively, the semi-conductive resin-coated sleeve or the inner surface of the semi-conductive resin sleeve, which has been subjected to a conductive treatment by applying a conductive agent, is subjected to mechanical polishing such as emery polishing and processed to a desired surface roughness. To be

The following techniques are conventionally known as a developer carrying member used in the conventional one-component developing device. (J04) Technology described in JP-A-1-142563. In this publication, the particle size is 3 to 100 μm (preferably 10 to 10 μm).
60 μm) and a coating solution in which metal oxide particles having a positive charge are dispersed in a resin is applied to the sleeve surface to be 5 to 10 μm.
The developer carrier having a coating film having the unevenness is shown. It is known that the irregularities on the surface of the developer bearing member on which such a coating film is formed are affected by the diameter of the filler such as the metal oxide particles. Further, it is known that the particles exposed on the surface of the developer carrying member play an important role of giving an electric charge to the developer by friction with the one-component developer. As described above, in the development method using the conventionally used high-resistance one-component developer, the one-component developer is charged mainly by friction with the developer carrier, so that the material constituting the developer carrier is is important. For example, in the case of a negatively charged one-component developer, a method of dispersing metal oxide particles, which tend to be positively charged with a positive polarity on the surface of the developer carrier, is an effective means.

[0008]

However, the conventional technique (J04) has the following problems. In the above-mentioned developer carrying body in which metal oxide particles of 3 to 100 μm are dispersed in the resin layer, even if unevenness of 5 to 10 μm can be formed on the surface thereof, the metal exposed on the surface of the developer carrying body Since the oxide particles are scattered in an island shape, for example, a part of the one-component developer having an average particle size of about 9 μm may not be able to come into contact with the metal oxide particles, and the one-component developer is provided with sufficient triboelectric charge. Can not do it. As a countermeasure, increasing the addition amount of the metal oxide particles can be considered, but increasing the addition amount decreases the resin content as a binder and weakens the coating film strength, which is not a preferable method. Further, in order to increase the relative density of the metal oxide particles exposed on the surface of the developer carrying member, it is conceivable to reduce the particle size of the metal oxide particles. However, the surface roughness of the developer carrying member becomes too small, and the developer carrying amount becomes small, so that a desired image density cannot be obtained.

In view of the above-mentioned circumstances, the present invention has the following contents. (O01) In order to optimize the transport amount of the developer on the developer carrier regulated by the developer regulating member, an appropriate surface roughness is formed on the developer carrier and a desired image density is obtained. In order to impart sufficient triboelectric charge to the developer.

[0010]

[Means for Solving the Problems]

(First Invention) In order to solve the above-mentioned problems, the first invention of the present application
The invention relates to a developer carrier (4) which is provided so as to face the electrostatic latent image carrier (1) and which conveys the developer (6, 13) by adhering to the surface thereof, and the surface of the developer carrier (4). And a developer control member (10) for controlling the amount of the developer attached to the toner layer to thin the layer, and the developer carrying member (4) and the electrostatic latent image holding member (1) are opposed to and close to each other. In the electric field generated in the area (A),
The developer carrying body (4) has a surface-charged developer (6, 1
In a one-component developing device for adhering 3) to the electrostatic latent image (2) on the electrostatic latent image holder (1) to visualize it, the following requirements are met: (Y01) The development The surface layer of the agent carrier (4) is formed of inorganic compound particles (8, 9) and a resin layer (4b) containing a binder resin as an essential component, and (Y02) the inorganic compound particles (8, 9) are At least the first inorganic compound particles (8) belonging to a large particle size range capable of obtaining the required surface roughness and the developer (6, 13) in contact with each other with little influence on the surface roughness. Second inorganic compound particles (9) belonging to a small particle size range to be triboelectrically charged.

(Second invention) Further, the one-component developing device of the second invention of the present application is characterized in that, in the one-component developing device of the first invention, the following requirements are satisfied: (Y03) The average particle size of the first inorganic compound particles (8) is 1 to 20 μm.
The average particle size of the second inorganic compound particles (9) is in the range of 5 to 100 nm.

(Third Invention) Further, a one-component developing device of the third invention of the present application is characterized in that the one-component developing device of the first or second invention has the following requirements.
(Y04) The first and second inorganic compounds are selected from metal oxides, hydroxides, boron compounds, silicon compounds, nitrogen compounds, carbon compounds and basic metal oxides.
Be a compound or two or more compounds.

(Detailed Description for Solving the Problems) The present invention will be described in detail below. The developer carrier (4)
Examples of the binder resin forming the surface layer of the electric resistance control agent, a phenol resin having a reinforcing material dispersed therein, a melamine resin, a urea resin, an epoxy resin, a polyester resin, a polyamide resin, a polyimide resin, a polycarbonate resin,
Alkyd resin, acrylic resin, polystyrene resin, silicone resin and the like are used. The solvent used when forming the surface layer includes hydrocarbons such as hexane, ligroin, benzene, toluene and xylene, ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone, methanol, ethanol and n-butanol. And the like, ethers such as dibutyl ether, tetrahydrofuran and butyl cellosolve, and esters such as ethyl acetate, butyl acetate and ethyl butyrate. These binder resins and solvents may be used alone or in admixture of two or more.

As the inorganic compound particles (8, 9) contained in the resin layer (4b), zinc oxide, alumina, titania, zirconia, magnetite, red iron oxide, hetamite, tin oxide, tantalum oxide, iron oxide, iron oxide are used. Metal oxides such as zinc, yttrium iron oxide, cadmium iron oxide, gadolinium iron oxide, copper oxide iron, lead iron oxide, nickel iron oxide, iron oxide neodymium, iron barium oxide, magnesium iron oxide, manganese iron oxide, and lanthanum iron oxide. , Boron oxide, boron compounds such as molybdenum boride, silica, silicon compounds such as magnesium silicate, boron nitride (also one kind of boron compound), nitrogen compounds such as iron nitrate, carborundum (one kind of silicon compound), Boron carbide (a type of boron compound), carbon compounds such as graphite, basic copper carbonate, white lead, calcium titanate Particles of basic metal oxides such as barium titanate and calcium tungstate are preferred. In addition, various metal hydroxides and particles of gypsum, zinc sulfide, iron sulfide, etc. can be used. As these inorganic compound particles (8, 9), those which have been surface-treated with an organic compound having a silanol group, an alkyl group or the like in advance, those which have been previously coated with a resin or those which have been impregnated with a resin may be used. It is also possible to use a mixture of two or more inorganic compounds.

In the present invention, the average particle size of the first or second inorganic compound particles (8, 9) may be any combination of two or more different particle size ranges. That is, particles having a smaller particle size are present between the large-diameter particles so that the surface of the resin layer (4b) is formed with irregularities having a required surface roughness in which the large-diameter particles and the small-diameter particles are mixed. The inorganic compound particles (8, 9) may be dispersed in the resin layer (4b) so that the triboelectric charging particles are exposed on the surface. The mixing ratio between the inorganic compound particles is, for example, 10 to 300 of the large-diameter first inorganic compound particles (8) with respect to 100 parts by weight of the binder resin.
Part by weight and small diameter second inorganic compound particles (9) 1-2
0 weight part is preferable, and especially large particle (8) 50-17
5 parts by weight and 3 to 10 parts by weight of small-diameter particles (9) are preferred.

To form the resin layer (4b), first and second inorganic compound particles (8, 9) having different particle size ranges,
First, an electric resistance control agent, a binder resin, a solvent and the like are mixed to prepare a coating liquid. At this time, the viscosity and film-forming property of the coating liquid obtained by adjusting the mixing ratio of the solvent are adjusted. Then
While rotating the cylindrical base material, the surface thereof is coated with a coating solution by air spraying or the like, and the binder resin is cured at 150 to 250 ° C. The above procedure may be repeated 2-3 times in order to obtain the desired coating thickness. The resin layer (4b) thus formed has an uneven shape in which the inorganic compound particles (8, 9) are exposed on the surface, and the surface roughness Rz is generally in the range of 0.5 to 10.0 μm. , Developer (6,
The roughness is appropriate for attaching 13) stably.

In the developing device of the present invention, the one-component developer (6, 13) may be magnetic or non-magnetic. The one-component developer (6, 13) is the developer regulating member (1
0) and the surface of the developer carrying member (4) are thinned.
At the same time, triboelectric charging imparts a positive or negative charge depending on the charging polarity of the developer (6, 13). The developer (6, 13) adheres between the irregularities on the surface of the developer carrier (4) and is conveyed, and the irregularity on the surface of the developer carrier (4) has a roughness Rz of 0.5 to 10. It is preferably in the range of 0 μm. If the roughness Rz is less than 0.5 μm, the amount of the developer (6, 13) conveyed is insufficient, and the desired image density cannot be obtained. On the other hand, when the roughness Rz is greater than 10.0 μm, the amount of the developer (6, 13) conveyed becomes too large, and the developer (6, 13) and the inorganic compound particles (on the surface of the developer carrier (4) ( The chances of contact with 8 and 9) are reduced, and sufficient triboelectrification cannot be performed.

[0018]

Next, the operation of the present invention having the above features will be described. According to the one-component developing apparatus of the present invention, the surface layer of the developer carrying member (4) has, for example, at least two kinds of inorganic particles having different particle diameter ranges of particles having an average particle diameter of 1 to 20 μm and particles having an average particle diameter of 5 to 100 nm. It is formed of a resin layer (4b) in which compound particles (8, 9) are dispersed. Therefore, when the large-diameter first inorganic compound particles (8) are partially exposed on the surface of the resin layer (4b), for example, when the inorganic compound particles (8, 9) having different particle size ranges are used, The surface roughness Rz of the resin layer (4b) is always in an appropriate range of 0.5 to 10.0 μm. The surface roughness varies depending on the type of the one-component developer (6, 13) and the developing conditions, and by setting the particle size of the first inorganic compound particles (8) having a large average particle size to an appropriate value,
Since the desired surface roughness can be obtained, the developer (6,
It is possible to optimize the transport amount of 13). Moreover, the second inorganic compound particles (9) having a small average particle size are partially exposed on the surface of the resin layer (4b), so that the resin layer (4b)
Since the exposure density of the inorganic compound particles (8, 9) in a minute area of the surface can be increased, the developer (6, 1
Sufficient triboelectric charge can be applied to 3).

[0019]

Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments. (Embodiment 1) FIG. 1 is an explanatory view of a developing device using a magnetic one-component developer which is Embodiment 1 of the present invention, FIG. 1A is an overall explanatory view thereof, and FIG. 1B is a portion near a surface of a developer carrier. It is an expanded sectional view. In FIG. 1A, the electrostatic latent image carrier 1 is a photoconductive drum having a negatively charged organic photosensitive layer on the surface thereof, and after being uniformly charged by a charging means (not shown),
An electrostatic latent image 2 is formed by the difference in electrostatic potential generated by irradiating the image light. The surface potential when the electrostatic latent image 2 is formed is, for example, −600V in the image portion and −120V in the background portion which becomes the white display portion during image formation. The one-component developing device 3 has a developer carrying member 4 arranged so as to face the electrostatic latent image holding member 1.

The hopper 5 of the developing device 3 stores the magnetic one-component developer 6 to be supplied to the developer carrying member 4, and accommodates the developer carrying member 4 as well as the electrostatic latent image holding member 1. The surface of the developer carrying member 4 is exposed at the portions facing each other, and the developer carrying member 4 and the electrostatic latent image holding member 1 are arranged in close proximity to each other. The rotation of the developer carrier 4 conveys the magnetic one-component developer 6 attached to the surface thereof, and is set so that the minimum gap in the development area A adjacent to the electrostatic latent image carrier 1 is about 200 μm. ing. Inside the developer carrying member 4, a plurality of magnets are arranged along the peripheral surface, and a magnet roll 7 fixed so as not to rotate is provided. The plurality of magnets form a magnetic pattern in which S poles and N poles are arranged along the peripheral surface, and the magnetic developer 6 can be attracted to the surface of the developer carrier 4 according to the magnetic pattern. It has become.

In FIG. 1B, the developer carrying member 4 is a base material 4a which is a cylindrical member made of aluminum and having a thickness of 0.7 mm.
And a resin layer 4b made of semiconductive resin and having a film thickness of about 80 μm formed on the peripheral surface of the resin layer 4b. In the resin layer 4b, large-diameter first inorganic compound particles 8
And the small-sized second inorganic compound particles 9 are dispersed. The resin layer 4b is formed by coating the surface of the base material 4a with a coating liquid in which first and second inorganic compound particles (8, 9) having different particle size ranges are dispersed in a binder resin and a solvent. It consists of a formed coating film. The composition of the coating liquid may include the following formulation examples as an example. The electric resistance of the resin layer 4b formed from these coating solutions is 7 × 10 ⁵ to 2 × 10 ⁶ Ω · cm, and its surface roughness is 4.0 to 9 in terms of JIS 10-point average roughness Rz. 0.0μ
m.

Formulation Example i) Parts by Weight Binder Resin Polyester Resin 68 (Dainippon Ink and Chemicals, Inc .: M6401-50S) Melamine Resin (Mitsui Toatsu Chemicals, Inc .: U-80S) 19 Epoxy Resin (Asahi Denka Kogyo) (Inc .: EP-5100-75X) 13 First and second inorganic compound particles Silica particles having an average particle size of 1.5 μm (Tatsumori: VX-X) 115 Silica particles having an average particle size of 16 nm (Japan Aerosil Co., Ltd .: 130) 7 Electric resistance control agent Carbon (Degussa Company: FW-200) 9 Solvent xylene 85 Methyl isobutyl ketone 85 n-Butanol 28 Butyl cellosolve 28 Formulation example ii) Average particle size as the first inorganic compound particles 1.
The same as the above-mentioned formulation example i) except that silica particles having an average particle size of 2.5 μm (Tatsumori Co., Ltd .: VX-SR) are used instead of the silica particles having a particle size of 5 μm.

The developer regulating member 10 shown in FIG. 1A comprises an elastic member 10a that is pressed against the surface of the developer carrying member 4 and a leaf spring 10b to which the elastic member 10a is adhered.
The other end of the leaf spring 10b is fixedly supported by the main body of the developing device 3. The contact position of the elastic member 10a with respect to the developer carrying member 4 is the developer with respect to the reference line connecting the surface position where the developer carrying member 4 is closest to the electrostatic latent image holding member 1 and the center of the magnet roll 7. It is arranged on the straight line of 80 ° on the upstream side in the rotation direction of the carrier 4. Further, the free end of the leaf spring 10b is attached so as to be inclined to the downstream side in the rotation direction of the developer carrying member 4. The elastic member 10a is made of silicone rubber having a width of 15 mm, a thickness of 1.00 mm and a rubber hardness of 50 °, and the leaf spring 10b is a stainless steel plate having a thickness of 0.1 mm (SUS304CSP3 / 4 material, tensile strength 95 kg).
f / mm ² and proof stress 68 kgf / mm ² ) are used. (↑ What is the meaning of “proof stress”?) For those whose clear yield point cannot be grasped, the stress equivalent to 0.2% of residual strain is called “proof strength” and is used instead of the yield point.

A DC superimposing AC voltage, which is a bias voltage, is applied to the base material 4a of the developer carrying member 4 by a high-voltage AC power supply 11 and a DC power supply 12 connected in series, so that the developer carrying member 4 and the electrostatic latent image are electrostatically charged. An alternating electric field is generated between the electrode connected to the conductive layer (aluminum foil) of the electrostatic latent image carrier 1 and the base material 4a in the developing area A where the image carrier 1 is in close proximity. The bias voltage has an AC component frequency of 2.4 kHz and a peak-to-peak voltage of 2200.
The V and DC components are set to -270V, respectively.

(Operation of First Embodiment) Next, the operation of the first embodiment of the developing device having the above-described structure will be described. The one-component developing device 3 is filled with a positively-charged magnetic one-component developer 6,
Used by mounting on an electrophotographic copying machine. Electrostatic latent image holder 1
At the time of developing the electrostatic latent image 2 above, the one-component developer 6 in the hopper 5 adheres to the surface of the rotating developer carrier 4 and causes unevenness on the elastic member 10a of the developer regulating member 10 and the surface. The formed resin layer 4b is rubbed. in this case,
The first inorganic compound particles 8 having a large average particle size dispersed in the resin layer 4b are partially exposed on the surface of the resin layer, whereby the surface roughness of the developer carrying member is adjusted to an appropriate roughness, for example, Rz.
Is adjusted in the range of 0.5 to 10.0 μm, so that the developer carrying member 4 has a sufficient developer layer thickness for developing the electrostatic latent image.
Can be formed on. At the same time, the second inorganic compound particles 9 having a small average particle size are partially exposed on the surface of the resin layer 4b, so that the exposure density of the inorganic compound particles 8 and 9 in a minute area on the surface of the developer carrier 4 is increased. Therefore, it is possible to impart a uniform and sufficient triboelectric charge to the one-component developer 6.

The thinned developer 6 is the developer carrier 4
Is conveyed to the developing area A with the rotation of the developer carrier 4
In the alternating electric field generated in the gap between the electrostatic latent image carrier 1 and
Many particles of developer 6 having a sufficient charge fly and reciprocate. Further, due to this reciprocating motion, the particles of the developer 6 collide with each other and the entire developer 6 becomes cloud-like. The cloud of the developer 6 is attracted to the electrostatic latent image 2 portion on the electrostatic latent image holder 1 by the DC component of the bias voltage, and the development is completed.

(Embodiment 2) FIG. 2 is an explanatory view of a developing device using a non-magnetic one-component developer which is Embodiment 2 of the present invention, FIG. 2A is an overall explanatory view thereof, and FIG. 2B is a developer carrier. It is a partial expanded sectional view near the surface. In addition, in FIG.
For convenience, the same members are designated by the same reference numerals. Figure 2
In A, the non-magnetic one-component developer 13 is used as the developer, the magnet roll 7 arranged inside the developer carrier 4 is removed, and the supply roll 14 is arranged so as to be in rotary contact with the developer carrier 4. Except for the above, it has the same configuration as the one-component developing device shown in FIG. 1A.

The developing conditions of the non-magnetic one-component developing device (3) are shown below.・ Potential of image part −450V and potential of background part −100
V ・ Minimum gap of development area A 200 μm ・ Material of base material 4a; Aluminum with thickness 3 mm ・ Resin layer 4b Film thickness 110 μm, electric resistance 7 × 10 ⁵ to 2 × 10 ⁶ Ω · c
m, surface roughness Rz 4.0 to 9.0 μm-Composition of coating liquid ... Same as in Example 1 First inorganic compound particles 8; Silica particles having an average particle size of 2.5 μm Second inorganic compound particles 9; Average particle Silica particles having a diameter of 10 nm-Abutting angle 80 of the elastic member 7a to the developer carrying member 4
° ・ Material of elastic member 7a Width 10mm, thickness 1.00mm, silicone rubber with rubber hardness 50 ° ・ Material of leaf spring 7b; Thickness 0.1mm of stainless steel ・ Bias voltage AC component frequency 3.5kHz, peak Two-peak voltage 2600V, DC component -220V

(Operation of Second Embodiment) Next, the operation of the developing device having the above-described structure will be described. When developing the electrostatic latent image 2 on the electrostatic latent image carrier 1, the non-magnetic one-component developer 13 in the hopper 5 rotates in the opposite direction at the same peripheral speed as the developer carrier 4. Is supplied to the developer carrying member 4 and adheres to the surface of the rotating developer carrying member 4. When the elastic member 10a rubs against the resin layer 4b,
The developer 13 is thinned and at the same time, is given an electric charge,
The developer carrier 4 is conveyed to the developing area A as the developer carrier 4 rotates. Thereafter, in the same manner as in Example 1, the developer 13 is attracted to the latent image 2 portion on the electrostatic latent image holder 1 to complete the development. According to the second embodiment, a clear image similar to that of the first embodiment can be obtained.

[0030]

The one-component developing device of the present invention has the following effects. (E01) In the surface layer of the developer carrier in the one-component developing apparatus of the present invention, at least two kinds of inorganic compound particles having different particle diameter ranges, that is, two or more kinds of inorganic compound particles having different average particle diameters are dispersed. It is formed of a resin layer. As a result, among the two or more kinds of inorganic compound particles, some of the inorganic compound particles having a large average particle size are exposed on the surface of the resin layer, so that the surface roughness of the developer carrying member is adjusted to an appropriate roughness, for example, Rz. Can be adjusted in the range of 0.5 to 10.0 μm, so that a developer layer thickness sufficient for developing the electrostatic latent image can be formed on the developer carrying member. At the same time, by exposing a part of the inorganic compound particles having a small average particle size to the surface of the resin layer, it is possible to increase the exposure density of the inorganic compound particles in a minute area on the surface of the developer carrier, and to make it uniform in the one-component developer. In addition, sufficient triboelectric charge can be applied. Therefore, by applying the one-component developing device of the present invention to an image forming apparatus such as a copying machine or a printer that develops an electrostatic latent image, a clear image can be stably obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a first embodiment of a developing device of the present invention using a magnetic one-component developer, and FIG. 1A is a sectional view showing the developing device and a part of the surface of an electrostatic latent image carrier. Figure, Figure 1B
FIG. 1B is an enlarged cross-sectional view near the surface of the developer carrying member shown in FIG. 1A.

FIG. 2 is an explanatory diagram of Embodiment 2 of the developing device of the present invention using a non-magnetic one-component developer, and FIG. 2A shows the developing device and a part of the surface of the electrostatic latent image carrier. 2 is a cross-sectional view.
2B is an enlarged cross-sectional view near the surface of the developer carrier shown in FIG. 2A.

FIG. 3 is a sectional view of a conventional developing device using a magnetic one-component developer.

FIG. 4 is a sectional view of a conventional developing device using a non-magnetic one-component developer.

[Explanation of symbols]

A ... Development area 1 ... Electrostatic latent image holder, 2 ... Electrostatic latent image, 3 ... One-component developing device, 4 ... Developer carrier, 4a ... Base material, 4b ... Resin layer, 5 ...
Hopper, 6 ... Magnetic one-component developer, 7 ... Magnet roll, 8 ... First inorganic compound particles, 9 ... Second inorganic compound particles, 10 ... Developer regulating member, 10a ... Elastic member, 10b
... leaf spring, 11 ... high-voltage AC power supply, 12 ... DC power supply, 13
... non-magnetic one-component developer, 14 ... supply roll

Claims (3)

[Claims] 1. A developer carrying member which is provided so as to face an electrostatic latent image holding member and which adheres and conveys a developer onto the surface thereof, and a thin layer which regulates the amount of the developer adhering to the surface of the developer carrying member. And a developer control member that changes to a charge, and a developer having a charge on the surface of the developer carrier is generated in an electric field generated in a developing region in which the developer carrier and the electrostatic latent image carrier face each other. A one-component developing device which is visualized by being attached to an electrostatic latent image on the electrostatic latent image holding member, wherein the one-component developing device has the following requirements: (Y01) Surface of the developer carrying member The layer is formed of a resin layer containing inorganic compound particles and a binder resin as essential components, and (Y02) the inorganic compound particles belong to at least a large particle size range capable of obtaining a required surface roughness. The contact between the inorganic compound particles of No. 1 and the surface roughness is small. It is made of the second inorganic compound particles belonging to a small particle size range for triboelectric charging of the agent. 2. The one-component developing device according to claim 1, wherein the following requirements are satisfied: (Y03) The average particle size of the first inorganic compound particles is in the range of 1 to 20 μm, and the second inorganic compound particles are The average particle size of is in the range of 5 to 100 nm. 3. The one-component developing device according to claim 1 or 2, which has the following requirements, (Y04) wherein the first and second inorganic compounds are a metal oxide, a hydroxide, a boron compound,
One or more compounds selected from silicon compounds, nitrogen compounds, carbon compounds and basic metal oxides.