JPS5971064A - Developing device - Google Patents

Abstract

PURPOSE:To scatter toner and to charge electrostatically the toner uniformly and develop a low-potential latent image by providing a developer supplier with an electrode group, and giving those electrodes a potential difference enough to move the toner. CONSTITUTION:A developing roll 8 which has several hundreds-several thoussands of small electrode group 8n formed lineary in a cylinder surface faces a photoreceptor 1 which holds an electrostatic latent image at an interval of 50mum. An elastic blade for specifying toner layer thicknes provided atop of a toner hopper abuts on the developing roll 8 to supply a specific amount of toner to the developing roll. When a wave-shaped voltage is applied to the electrodes successively, the toner 2 while scattering is carried on the developing roll and charged during the scattering. A bias is applied to a development part to make the polarity of the toner coincident with the polarity of the latent image, thereby carrying out reversal develpment. The toner is carried by rotating the developing roll and may be scattered only at the development part.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] [Technical Background of the Invention and Problems Therewith] As a developing method for an electrostatic latent image, there are dry methods such as a magnetic brush development method, a cascade development method, and a fur brush development method. Although many methods are known, including various variations, including a liquid development method using a development method or an electrophoresis method, relatively few of them have been put into practical use.

Incidentally, in recent years, scanning type electrophotographic recording devices such as laser printers or liquid crystal printers have become popular, but most of the developing methods for electrostatic latent images used in these devices involve reversal development. . This is because developing only the area where the electrostatic charge has been erased by applying a light beam to the photoconductor surface is smaller in area, which reduces the amount of electrical information processing and improves the accuracy of mechanical beam control. This is to make it more relaxed.

In this developing method, a non-magnetic developer 2 is applied in a non-contact state to an electrostatic latent image holding surface 1, which is a surface to be developed, as shown in FIG.
Electrodes 3 having a thin layer of are placed opposite each other, and an electric field generated between the latent image and the electrodes 3 and a bias voltage applied from the outside cause the developer 2 to fly and adhere to the latent image area by electrostatic force, thereby developing the image. (hereinafter referred to as non-contact development) is being considered.

However, in this non-contact development, there is no effective means for uniformly charging the developer 2 and maintaining a predetermined charge range, which is necessary to make the N developer 2 fly selectively. The electric field required to make it fly is large, for example,
Even if the gap between the latent image surface 1 and the electrode 3 is close to 150 μm, the potential of the latent image must be about 1000 V, and there are only a limited number of photoreceptors that can withstand this. Furthermore, even if an external bias is applied to reduce this problem, arc discharge may occur due to the closeness of the electrodes 3, damaging various parts, or fogging or unevenness may occur due to uneven charging of the developer 2. There are problems that arise and remain unresolved.

Among these problems, there is a method to keep the developer 2 uniformly charged by separating only the toner from the two-component developer, but if the carrier is not completely separated and gets mixed into the toner, , arcing is more likely to occur, and the developer must be replaced periodically, so a one-component developer without a carrier is preferred.

Furthermore, the main purpose of non-contact development is to not disturb the previously developed image when performing overlapping development in color electrophotography, so black is the preferred color developer for various colors. It is also not preferable that the toner be a magnetic toner containing magnetic powder that exhibits the same characteristics, and a non-magnetic one-component developer (hereinafter simply referred to as a toner) is required.

Another method currently being used to uniformly charge toner is to rub the toner on a roll with a rubber blade made of urethane or the like to form a thin layer. However, the probability of contact between the toner and the roll or blade and the efficiency are extremely low, and it is nearly impossible to uniformly charge the toner in one layer. This is a cause of image defects as described above.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to dramatically increase the flying efficiency of toner, make it possible to develop electrostatic latent images at lower potential, and 1. By uniformly charging, a higher quality image can be provided, and non-magnetic toner can be mechanically transferred. A potential difference is applied between the electrodes by scanning, and the developer is caused to fly between the electrodes and is supplied to the area to be developed.

We will establish the following in the order of consideration. First, the most dominant force that restricts the flight of toner is the electric charge of the toner.A dielectric layer (3-1) is provided on the developing electrode as shown in FIG. 1(C). This decision was made after considering the relationship with the strength of the electric field. Assuming that the center of the toner with radius r has a charge q as shown in FIG. 1(b), the mirror image force Fn is a value expressed as (ε0 is the permittivity of vacuum), and the particle diameter of the toner, Or toner and '7! The particle diameter changes in inverse proportion to the square of the distance between the toner and the electrode 3, or the particle diameter changes in inverse proportion to the square of the distance between the toner and the electrode 3, and the gap D in the developing area
If ED is the attraction force of the toner generated by the TIL field E caused by the latent image K, that is, the flight force, then the following relationship holds true, and the toner flight condition is that the particle size is determined by the image quality. It is large in the range, and the amount of charge is 1 U = obtained from the differential of both sides.
It is understood from the conditional expression of o that when the value qq=8πεor2E is given, the FD reaches its maximum value and is most likely to fly. The amount of charge on the toner can be adjusted to some extent by adjusting the material, but as mentioned above, it has been impossible to uniformly charge each toner, and it is important to solve this problem. . Now, it can be understood from this consideration that in order to improve the development sensitivity or make it easier for the toner to fly, it is better to move the toner away from the electrode 3.
), the mirror image force Fn can be drastically reduced by forming a dielectric layer 3-1 of 10 to 20 μm such as polyester or epoxy resin on the electrode 3.
In fact, it is recognized that toner flight is improved. However, the dielectric layer itself cannot avoid triboelectricity,
Finally, new electrostatic force interference generated between the toner and the dielectric layer 3-1 significantly impairs the uniformity and stability of the image.

It is thought that the above-mentioned problems caused problems in this developing method in the past, and the present invention was obtained by trying a new solution based on these analyses.

The present invention can be used in either light or dark positions. Yoeyu,,7
7! Q: A voltage that provides a potential difference between a developer supplying body having an electrode group, which is provided opposite to the developed area having a main turn, and the electrodes of the electrode group of this developer supplying body to move the developer between the electrodes. an application unit, the polarity of the potential pattern of the developed part and the charged polarity of the developer are the same polarity, and the potential applied between the electrodes of the electrode group is biased to the potential of the developed part. It is.

[Eleven Examples of Fruits of the Invention] Hereinafter, an example in which an embodiment of the present invention is applied to a copying machine will be described.

FIG. 2 is a sectional view of the main parts of an electronic copying machine to which a developing device according to the present invention is applied. Electrophotographic photoreceptors (hereinafter simply referred to as photoreceptors) selected from amorphous selenium, silicon, inorganic photoreceptors of selenium/tellunat, resin-dispersed photoreceptors such as zinc oxide and cadmium sulfide, and various organic photoreceptors.
1 is uniformly charged to about 500 to 800 cm by the corona charging device 4. Next, the original 5 is projected onto the photoreceptor 1 by the optical system 6 to form a latent image. The latent images are developed by a developing device 7 according to the present invention, which will be described later, and are transferred onto transfer paper fed from a paper feed cassette 1 by a transfer corona 12.
and the recording paper peeling corona 13. This unfixed image 1d is heated and fixed by the fixing beat roller fN14, and is discharged outside the machine to be used as a copy. - The toner remaining on the photoconductor 1 is neutralized by the static eliminating corona 15 and its adhesion is weakened, and the toner is cleaned and removed by the fur brush cleaner 16 (a part of which is omitted in the figure), so that the photoconductor 1 can be reused. returned to a normal state.

In addition to the well-known electronic copying apparatus as explained in the above example, the present invention is also applicable to a developing device of a type of image recording apparatus using an electrostatic 71.1 image.

Next, the developing device 7 will be explained in detail.

As shown in FIG. 3, the developing device 7 of this example has several to thousands of small 'P's formed on the surface in lines parallel to a large number of cylinders.
1), a developing roll 8 as a supply body having a pole group 8n;
Hole 2-9 for storing and supplying the toner 2 as a developer, and urethane, styrene butanoene, silicone, etc. for footing the toner 2 on the developing roll 8 while maintaining a substantially constant thickness. An elastic blade 10 made of a rubber material is brought into contact with the developing roll 8 at an angle such that its tip is approximately horizontal.

The developing means is the same as the conventionally known developing means except that the image roll 8 has a small electrode group 8n, but this small electrode group 8n exhibits a great effect. The direct effect of this small electrode group 8n is to cause the toner 2 to fly slightly onto the developing roll 8. This is explained by the following model. Figure 4(a)
, (b) is an enlarged view of a portion where two arbitrary adjacent small electrodes 8-a and 8-b in the small electrode group 8n are interposed with a dielectric 18, and FIG. Small electrode 8 in the state of
The toner 2 (assumed to have positive polarity in this case) on the electrode 8-b is transferred from the small electrode 8-b as shown in FIG. 4(b) at the moment when the external bias voltage E is applied to the switch Sn. It receives repulsion and is attracted by the small electrode 8-a, and moves by flying along the lines of electric force between 2'r:14iff8-ar8-b as shown by the arrows in the figure. The conditions for this flight vary depending on the shape of the electric field generated between the electrodes depending on the distance between the electrodes, the strength of the voltage applied between the electrodes, and the charging scale of the toner 2. For example, if the distance between the electrodes is 200 μm, ) Amount of charge of the toner 5 μc/1/s ) Average particle size of the toner 13 μ
When the noise voltage E was 200 to 500 V or higher, good flying movement of the toner 2 was observed.

Photoreceptor 1 is charged to V. 7t ruto() 0ras 1000
V~), and the portion exposed to laser light or the like discharges and becomes vR (glass 100V~).

Here, as shown in Fig. 1, the lightning that turns the toner into smoke one after another on the small electrode, pressure E1 and photoreceptor ■
. When a slightly smaller potential and a larger voltage E2 are placed, the potential relationship between these and the potential distribution PX on the photoreceptor becomes as shown in Figure 7, and the positively charged toner is exposed to light. In the irradiated region A, which has a low potential, it is attracted to the photoreceptor, and in the region B, which is not exposed and has a high potential, it is repelled and returns to the electrode. This situation can be understood as the movement of the toner in the direction of the arrow indicated by the plus sign in the figure. Furthermore, in this movement...! Due to the voltage E1 that is completely applied in a linear manner, the toner vibrates on the electrode with a small diameter.
In other words, a smoke-like layer is formed and the toner moves smoothly due to the electric field of the latent image and the bias E2, resulting in more dense and better image quality and reversal that allows development with a low electric field. It can be developed. Therefore, it is necessary for E2 to have a value of +at-vR1 sufficient to make the toner fly to the photoreceptor, and normally g
, -v, needs to be 400 to 500V or more. On the other hand, E1
is the value at which the toner becomes smoky on the electrode.
It is set between 0 and 500V. Furthermore, as shown in FIG. 6, the terminals 5l-8n are connected to a large number of small electrode groups 8n.
When the voltage application parts are successively moved in a wave-like manner at a speed of several millimeters and seven cant, the toner 2 forms a smoke layer d1 estimated to be about 10 to 100 μm, while also moving in the direction of voltage movement (in the figure). The speed at which the developing roller 8 moves as indicated by the thick arrow) and rotates around the developing roll 8 is several tens of millimeters to 100 millimeters, depending on the height of the applied voltage and the scanning speed.

As shown in Fig. 8, in order to ensure the directionality of toner flight, it is important to scan multiple electrodes at the same time while maintaining the same potential or polarity; This can be understood as causing the toner to slide to a lower potential by moving the potential as if by wave force; moving over the electrode.

In addition, in order to prevent uneven toner flying in the form of stripes during development of the photoreceptor 1, the voltage applied in a continuous manner (between the small electrodes 8n) should be applied to the irregularities of the photoreceptor 1. A sufficient number of base passes is required, and a plurality of base passes must be printed in the development area.

As described above, the toner 2 flies over the small electrode group 8n provided on the circumferential surface of the developing roll 8 from the inside of the motherboard 9, and rotates around and around while completely changing its shape.The toner smoke layer d1 is completely formed while being conveyed. It is being done. As mentioned above,
Since the mirror image force decreases as the distance from the electrode 8n increases, the toner is easily attracted to the latent image area on the photoconductor 1 where there is an attraction force greater than the force returning to the adjacent city 14 8n, and the toner is developed. .

On the other hand, since the toner 2 becomes a smoke layer on the developing roll 8 and is repeatedly vibrated or rotated,
The number of times of contact with the surface of the developing roll 8 is dramatically increased compared to the conventional method in which contact is made only once, and the problem of non-uniform charging no longer occurs.

Furthermore, it will be understood that the problem of agglomeration of the toner 2, which is less likely to occur, can be solved by the vibration of the toner. In addition to the method of applying voltage to the small electrode group 8n, in addition to the method of sequentially moving the application position as described above, applying voltage to the terminal 5t-8 at random to cause the toner to move without directionality, A Nismorph layer is formed on the entire surface. (Note) "Random" does not only mean completely regular, but also includes irregular repeating. The developing roll is rotated without electrically moving the toner. Then, the toner may be conveyed for development (Jt). In this case, the restriction on the development speed due to the toner conveyance speed ° due to the electrical capacity is 2.
:Erase 0Randomly generate smoke":If you try to do this, the toner that produced 8-d above at time 11 will be 8-d.
At time t2, when the toner is attracted to c and attempts to return, its phase changes due to scanning, and when the toner has the same polarity as k, it is repelled and remains in the air, forming a cloud-like smoke (cloud layer). The image becomes more easily developed by the electric field. In such a development mode, a photoreceptor having a lower potential can be developed. However, in reality, the movement of all toner is not always in phase, but due to the amount of toner charge and variation in particle size, etc., the movement of toner is random, and the turbulent flow layer of toner with a wide range ( Smoke).

In addition, if a large number of wiring lines are to be avoided, the rotor 17-a connected to the voltage supply electrode 17-a and the small electrode group of the developing roll 8, as shown in the example shown in FIG. If the contact position of 17-b and the position of 17-b are arranged to face the photoreceptor 1, a smoke layer of toner will be generated only in the developing area, and it is expected that this will be more effective in preventing scattering. be done.

In addition, as a result of applying vibration to the toner itself, the toner layer itself is averaged and it becomes easier to form a uniform layer thickness, so the accuracy required of the blade 10, etc. A little help is enough. Conventionally, the toner layer thickness is determined by the molar layer [toner particle thickness]
If the thickness exceeds the above, the toner will not be charged uniformly, resulting in image unevenness, so thick layers cannot be used, and as a result, sufficient image density cannot be obtained.However, in the present invention, the toner can be charged with high efficiency. Even if the thickness is several times or more that of the toner particles, a high-density image without fogging can be obtained. The spacing between electrodes, the method of applying voltage across a plurality of electrodes, and the scanning method are not limited to the embodiments, and voltage scanning of synthetic waveforms for various purposes is possible.

As a result of the above, as an example of the conditions under which a good image can be obtained, (1) Photoreceptor: A selenium/tellurium photoreceptor with a film thickness of 60 μm is charged to a glass at 700 V and rotated at a circumferential speed of 80 f/sec.

■ Gap between photoreceptor and developing roll: 5011m ■ Between two aluminum electrodes on the developing roll/small electrodes with a small pitch of -3
00V, scanning voltage with a period of 15 mm and 7 cants.

■ Toner: 50 coefficient average particle size 135 μm 1 Toner charge on sleeve 4th place minus 80 V ■ Toner layer thickness: Approximately 30 μm As a result of the image output test under conditions of more than 1, the image density was 1.
Good image quality with high sharpness of 2 or more was obtained. this is,
Under conventional conditions for developing without producing a smoke layer on the toner, almost no image density is obtained in the solid area, and the lines are only slightly readable, but this is a significant difference. As a result, it is not only possible to use many organic photoreceptors and zinc oxide photoreceptors with low electrical withstand voltages that can only be used with a charge of 600 to 700 volts or less.
As a result of solving many of the problems described above, it is now possible to provide a developing device that can use color toners that can be developed in multiple colors on a practical level.

As described above, in the present invention, instead of applying a flying electric field to the toner only in the area facing the photoconductor as in the conventional case, a micro electric field is formed on a flat surface over the entire area of the developing roll, and as a result, the toner As a result, the various efficiencies mentioned above are produced.

Now, in addition to the above-mentioned principle, we will further explain the material conditions. In terms of materials, the most important factors are the selection of the material of the toner 2 and the frictional charging properties of the developing roll 8, especially the electrode group 8n.
The same consideration as for the combination of carrier and toner in a two-component developer is required, and one that maintains a stable amount of charge on the developing roll 8 is selected. In addition, as toner, materials that have been used as two-component materials can be used as they are; It is necessary to adjust it according to the triboelectrification property with the aluminum, alumite, copper, aluminum, tin, or chrome-plated materials used. It is currently difficult to predict the amount of charge (F), and trial and error of combinations is required.In addition, in this method, it is also necessary that toner 2 has excellent mechanical fluidity. Therefore, it is effective to spray in hot air or add silica powder to make the toner spherical.The optimum charge amount of the toner satisfies the above formula, and this method is effective. However, by selecting the small interelectrode distance to a value smaller than the distance between the photoreceptor 1 and the developing roll 8, a voltage smaller than the voltage that should be applied between the photoreceptor I and the developing roll 8 can be applied. The toner can be made to fly.Moreover, the flying toner has a weakened image force and is easily attracted to the latent image.For example, the binding force of toner that has flown 20 μm is calculated to be 1/16th.

On the other hand, the toner that does not reach the latent image is attracted to another electrode and returns to the developing roll 8 in the next moment, so there is no need to worry about it flying out of the apparatus. Note that the method of supplying the toner is not limited to this, and the toner may be separately supplied onto the developing roll 8 using a conventional two-component developer and a magnetic brush method or a cascade method. This method is suitable for improving the developing method described in FIG. 3, in which the toner charging efficiency is low, since the toner is supplied with a charge applied in advance.

Further, the developing roller 8 does not have to be cylindrical, and may be modified into a belt shape, etc. The shape of the small electrode group 8n may also be made into a spiral or spiral shape, or the small electrode group may be formed into a shape of several micrometers or four. It is also expected that the flying characteristics and dispersibility of toner will be improved by forming microscopic irregularities in the range of microns to several tens of microns. Small electrode 8n
The bias applied between the two is not limited to direct current, and there is no theoretical doubt that the same effect can be obtained by controlling the phase of alternating current even if alternating current is used.

Furthermore, in this example, toner with an insulating charge was used, but if a toner with low resistance is used, it is easier to inject charge from the electrode into the toner, so the toner is always at the same level as the electrode. It is well known that low-resistance toner has problems in image transfer from a photoreceptor, although the polarity makes it easier to fly. However, if pressure transfer is used, this can also be used.The combination of the polarity of the toner and the bias polarity to be applied to the small electrode group 8n is not limited to the embodiment, and its potential If necessary, it is of course possible to apply a value that suppresses fogging or strengthens the electric field between the photoreceptor and the toner to promote the flying of the toner. What is necessary to form the small electrode 8n is to provide a potential difference between the small electrodes 8n, and to this extent, biasing the bias in positive and negative directions is included in the gist of the present invention, and the As shown in Figures 10-1 and 11, modifications can be made to suit any purpose. In the explanatory diagram, a switch Sn is used as an electrical switch, but this is just a switch used for the convenience of explaining the flight of toner. An electric circuit or the like is used to control the necessary application time, and the power is distributed in such a way that the phase of the voltage changes one after another, rather than applying a constant voltage to a specific electrode repeatedly. As shown in FIGS. 14 and 15, the dielectric 18 interposed between the electrodes may have its upper end protruded from the upper surface of the electrode Bn, and the protrusion may be formed in an arc shape. .

According to this, when the toner 2 is moved in the horizontal direction by the force FT generated by the voltage application, it is reflected on the side surface of the upper end of the dielectric material 18 and is scattered upward in the direction of the arrow. It is possible to charge the body 1 at a lower level, which is advantageous in terms of life.

Further, the upper end shape of the dielectric body 18 may be formed into a tapered shape that gradually rises in the moving direction of the toner 2, as shown in FIG.

According to this, it is possible to restrict the flow of the toner 2 in the opposite direction,
The transportation can be made even more reliable.

〔Effect of the invention〕

As explained above, in the present invention, a voltage is applied to the electrode group of the developer supply member in a scan 15 to create a potential difference between the electrodes, and the developer is moved between the electrodes, so that the developer and the supply member are separated. The image force generated during this process can be significantly reduced, and the developer can be easily adsorbed to the area to be developed. Therefore, it becomes possible to develop an electrostatic latent image at a low potential, and it becomes possible to use many organic photoreceptors and zinc oxide photoreceptors with low electrical breakdown voltages. In addition, since the developer rotates or vibrates on the electrode of the supply body, the contact efficiency with the electrode is improved, the developer can be charged uniformly, and agglomeration of the developer can be prevented, resulting in high quality images. It has the effect of being able to.

[Brief explanation of the drawing]

FIGS. 1(,) to (c) are explanatory diagrams showing a conventional example, FIGS. 2 to 7 show an embodiment of the present invention, and FIG. 2 is an internal configuration diagram showing an electronic copying machine; FIG. 3 is a perspective view showing the developing roller; FIGS. 4(a) to (C) are explanatory views showing the principle of developer flight; FIGS. 5 and 6 are explanatory views showing the developer supply; FIG. 7 is a graph showing the surface potential of the photoreceptor, FIG. 8 is a first other embodiment of the present invention, and FIG. 9(a),
(b) is the second other embodiment, FIGS. 10(,) to (c) are the third other embodiment, FIG. 2811 is the fourth other embodiment, and FIG. 12 is the fifth other embodiment. FIG. 13 shows another embodiment of the sixth embodiment, and FIGS. 14 and 15 show another embodiment of the seventh embodiment, the first embodiment.
FIG. 6 is an explanatory diagram showing the eighth other embodiment. 1... Portion to be developed, 8n... Electrode group, E... Voltage application section. 1.3 IAI agent Patent attorney Takehiko Suzue 1st
Figure 2 Figure 30 4th cause Figure 5 7r! A 11-X Figure 6 @ 8 Figure s 9 Figure Kazuo Wakasugi, Commissioner of the Patent Office 1. Showing the incident! Office Application No. 57-180925 2, Name of the invention Developing device 3, Relationship with the case of the person making the amendment Patent applicant (307) Toureshibaura Electric Co., Ltd. 4, Agent 6, Specification subject to amendment 1 Drawing 7, Contents of amendment (1) The scope of claims is corrected as shown in the attached sheet. (2) ``A laser'' written on page 12, line 13 of the specification box is changed to ``1'', and is corrected to ``In addition to normal copying optical systems, 1, for example, a laser''. (3) "The positions of the voltage supply electrodes 12-a" as stated in the 3rd to 6th lines of page 18 of the specification are 1, the voltage supply electrodes 12-a and 17-b, and the developing roll 8. The position of contact with the rotor 2 nos a and 21-b connected to the small electrode group 8n is corrected. (4) The 1-gap 50 μrnj described on page 18, line 11 of the specification cylinder is [400 μm (] O0 to 600 μm)
Correct it with J. (5) The bias E1 applied between the electrodes is corrected from the negative 300 Vj between the electrodes to the positive 300 VJ described on page 18, line 13 of the specification. (6) Page 18 of the specification] "Scan..." written on the 4th line: C=, [■Furthermore, as E, plus 400V
Apply ~500V. ” to join. (7) Item i] s t:Z ] Correct "■" written in line 55 to "■". (“Minus 8” written on line 1816 of the 81 specification)
0v" is corrected as [plus 8ov-1. (9) Details ■Page 18, line 17, 7 “■J
Press "■" and d]. 0(l) 1: Correct Figure 3 of the middle cylinder of the drawing as shown in the attached weight. 2. Scope of Claims (1) A developer supplying body having a fI electrode group provided opposite to a portion to be developed having a potential pattern; and - developing between the electrodes of the electrode group of this developer supplying body; Provides a potential difference that moves the agent. a voltage applying section, the polarity of the potential pattern of the developed part is the same as the charging polarity of the developer, and - the potential applied between the electrodes of the electrode set is set to the potential iR of the developed part. The present invention is characterized in that the polarity is the same as that of the pattern and that the developer is set so that it reaches the potential pattern of the area to be developed. (2) The developing device according to claim 1, wherein a voltage is sequentially applied to the electrode group. (3) The developing device according to claim 1, wherein a voltage is randomly applied to the electrode group. (4) Claim No. 1, characterized in that the distance between the electrodes of the electrode group is smaller than the distance between the electrode group and the area to be developed;
Developing device according to item 2 or 3. (5) The developer is supplied with a charge applied in advance, or is frictionally charged with an electrode group or a portion of the developer supply body. (6) A dielectric material is interposed between the electrodes of the electrode group, a part of which is arranged in a row on the magnetic pole surface, and this protrusion is used as a guide for the flying developer. Characteristic claim 1
The developing device according to item 1, 2, 3, 4, or 5. Applicant's agent Patent attorney Takehiko Suzue Figure 3

Claims (6)

[Claims] (1) 4r44□ ・〜″−' !4
The developer is moved between the electrodes between a developer supply body having an electrode group, which is provided opposite to the developed area having a 'Z'4'7-n, and the electrode group of this developer supply body. a voltage applying section that applies a potential difference, the polarity of the potential pattern of the developed part and the charging polarity of the developer are the same polarity, and the potential applied between the electrodes of the electrode group is applied to the developed part. The potential of J? A developing device characterized by the fact that it has been completely removed. (2) The developing device according to claim 1, wherein a voltage is sequentially applied and scanned to the electrode group. (3) The developing device according to claim 1, wherein a voltage is randomly applied and scanned to the electrode group. (4) Claim 1, characterized in that the interval between the electrodes of the electrode group is smaller than the interval between the electrode group and the area to be developed;
Developing device according to item 2 or 3. (5) The developing device according to claim 1, 2, or 3, wherein the developer is supplied with a charge applied in advance, or is triboelectrically charged with an electrode group. (6) A dielectric material is interposed between the electrodes of the electrode group, and a part of the dielectric material is made to protrude above the electrode surface, and the I of the developer that flies through this protrusion part is
The developing device according to claim 1, 2, 3, 4, or 5, characterized in that the developing device is an id.