JPH0436769A - Image recorder - Google Patents

Abstract

PURPOSE:To obtain a high-quality toner image having high black density without fogging by providing a magnetic field generating means for generating a magnetostatic field in a hollow sleeve consisting of non-magnetic material which is provided on a recording electrode side and on a downstream side in the recording direction of the recording electrode. CONSTITUTION:The magnetic field generating means 11 for attracting a non-image toner which is just after passing through a very small gap part to the outer periphery of the sleeve 3 and a means for turning the sleeve 3 are provided in the cylindrical sleeve 3 consisting of the non-magnetic material which is provided in a space formed by the recording electrode 5 and a recording member and on the downstream side in the moving direction of the electrode 5. By the action of the carrying force of the recording member, the means 11 removes the non-image toner which flows out from the very small gap part at the edge of the electrode 5 from the recording member with the edge part of the electrode 5 spatially and temporarily in an instant by overcoming a gravity field, so that charges are not moved from image forming toner which is electrostatically charged to the non-image toner and the high-quality image having distinct image contour and high black density without fogging is obtained.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to image recording in which a magnetic toner, such as a conductive magnetic toner (hereinafter referred to as toner), is used to form a toner image by directly injecting a charge into the toner. Regarding equipment.

[Conventional technology]

Conventionally, a cylindrical recording member and a recording electrode consisting of a plurality of recording electrode needles are placed on the member at a minute distance, and magnetic toner is supplied to an area (recording area) formed by the recording member and the tip of the recording electrode. However, an image recording apparatus is known that forms a visible image of toner by applying a recording voltage to the recording electrode needle according to an image signal. Such an image recording apparatus is described in, for example, Japanese Patent Laid-Open No. 1-204079.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, when forming an image by applying a recording voltage to the recording electrode needle in the recording area, the recording member is simultaneously rotated so that the recording portion moves away from the recording area. Due to this rotation, toner (
Not only image-forming toner (image-forming toner) but also toner that does not form an image (non-image toner) flows out. In the above-mentioned prior art, a non-image toner removing means consisting of a sleeve and an alternating magnetic field is provided to remove this non-image toner. When the alternating magnetic field acts on the recording area, the contact position between the toner portion into which charges are injected and the recording member changes, and the image becomes distorted. For this reason, in the above-mentioned prior art, the non-image toner removing means is arranged downstream in the recording direction with a gap from the recording area to prevent the alternating magnetic field from affecting the recording area.

In such a case, the electric charge moves from the charged image toner to the non-image toner in the spaced portion, and the non-image toner is charged and adheres to the recording member. As a result, fogging occurs and the outline of the image becomes unclear. Also,
When a force is applied to remove the charged non-image toner with strong adhesion, a portion of the image toner is also removed, resulting in a decrease in black density.

An object of the present invention is to provide an image recording device that can effectively remove non-image toner flowing out of a recording area and obtain a high-quality toner image with clear image outlines, high black density, and no fogging. It's about doing.

[Means to solve the problem]

In order to achieve the above object, a recording electrode in which a plurality of electrode needles are arranged to intersect with the moving direction of the recording member, a recording member that moves with a minute gap with the recording electrode, and a recording electrode A hopper that deposits magnetic toner on the upstream side of the moving direction and supplies the toner to the minute gap by movement of the recording member; and a hopper that applies a voltage corresponding to the image to be recorded to the recording electrode; a driver for charging a toner portion in contact with the member; a cylindrical sleeve made of a non-magnetic material provided downstream in the moving direction of the recording electrode in a space created by the recording electrode and the recording member; and the sleeve. placed within the
A magnetic field generating means for attracting the non-image toner immediately after passing through the minute gap to the outer periphery of the sleeve, and a means for rotating the sleeve are provided.

[Effect]

The magnetic field generation mechanism uses the conveying force of the recording member to overcome the gravitational field to the non-image toner flowing out from the minute gap at the tip of the recording electrode, and instantly records it at the tip of the recording electrode both spatially and temporally. Since it is removed from the member, there is no charge transfer from the charged image forming toner to the non-image toner.
A high-quality toner image with clear image outlines, high black density, and no fog can be obtained.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a cross-sectional side view of the image recording apparatus of the present invention.

Conductive magnetic toner (hereinafter abbreviated as toner) 14 is deposited and stored in a hopper 6, the configuration of which will be described below, and the toner at the bottom is in contact with the recording member 1.

The recording electrode 5 includes a thin wire pattern 5b made of a non-magnetic conductor arranged on an electrode substrate 5a made of a non-magnetic insulator,
Recording electrode needles 5c made of a plurality of non-magnetic or magnetic conductors are arranged in a row in an out-of-plane direction in the figure on the tip side of the electrode substrate 5a.
, a driving integrated circuit 5d that applies a recording voltage to each of the recording electrode needles 5c, a protective member 51 made of an insulating non-magnetic material that protects the integrated circuit, and a surface of the electrode substrate 5a on the side opposite to the integrated circuit. It is composed of a heat sink 5f made of a non-magnetic material with good thermal conductivity and fixed thereto.

The terminal 5g of the integrated circuit 5d is fixed to the thin wire pattern 5b by means of solder 5e, etc., and the thin wire pattern 5b is joined to the recording electrode needle 5c by a bonding wire 5h. Furthermore, the recording electrode 5 is inclined toward the upstream side with its tip as a starting point.

The drum-shaped recording member 1 has a base made of a non-magnetic conductor 1a made of, for example, an aluminum alloy, and a surface made of an insulator 1b made of, for example, an anodized aluminum film or a thermosetting resin coating. 5c and about 20~
It is installed with a gap of 300 μm.

The recording member 1 is rotated by a drive mechanism (not shown) in the direction of the arrow shown in the figure, which is perpendicular to the column direction of the recording electrode needles 5c.

The sleeve 3 is made of a hollow non-magnetic material, is rotatably supported on the downstream side of the recording electrode 5 in the recording direction and adjacent to the recording electrode 5, and is driven by a drive mechanism (not shown) as shown in the figure. Rotate in the direction of arrow a.

The magnetic field generator 11 is a permanent magnet fixed to the recording device main body within the sleeve 3, and is, for example, a ferrite magnet manufactured by Hitachi Metals, Ltd. with a saturation magnetic flux density of about 0.4 T (4,000 Gauss). YBM-28D, which supplies magnetic flux to the recording electrode needle 5c and the hopper 6.

The scraper 8 has its negative side in contact with the sleeve 3, and the other side is fixed to the top of the recording electrode 5 by means not shown.

The rotating blade 7 is rotated in the direction of arrow e by a drive mechanism (not shown).

On the outer periphery of the recording member 1, there are provided a transfer roller 4 that presses the recording paper 2 onto the recording member 1, a cleaning blade 9 made of a flexible member that contacts the recording member 1 on one side, and a support that supports the cleaning blade 9. 10 are provided.

A screw 12 is installed in the stray toner receiver 13 and is rotated by a drive mechanism (not shown).

The toner hopper 6 deposits the toner 14 and the recording member 1 is on the lower surface thereof, so the toner conveying force generated by the rotation of the recording member 1 and the magnetic attraction generated by the magnetic field generating member 11 are applied to the recording electrode 5 and the recording member 1. The toner 14 is stably flowed out to the downstream side of the hopper 6 from the gap between the toner 14 and the hopper 1.

At this time, the driving integrated circuit 5d applies a recording voltage according to the image signal to the plurality of recording electrode needles 5c, selectively charges the toner 14 existing in the gap, and charges are injected. Electrostatic attraction is generated in the charged toner, which adheres to the recording member 1 and becomes image forming toner 14a.

When the non-image toner to which no charge is injected passes through the gap due to the two forces, toner transport force and magnetic attraction force, the magnetic attraction force that overcomes the gravitational field from the magnetic field generating member 11 causes it to move in the direction of arrow C. It flies toward the magnetic field generating hand 11.

The flying non-image toner 14b is attracted to the first sleeve 3 by the magnetism of the magnetic field generating member 11, is conveyed in the direction of arrow a by the rotation of the sleeve 3, is moved onto the scraper 8 by the scraper 8, and is transferred to the hopper. It will be collected within 6 days. At this time, the rotating blade 7 rotates in the direction of arrow e,
The non-image toner 14b is urged to be conveyed onto the scraper 8.

The charged toner 14a forming the image is transferred onto the recording paper 2 by the pressing force of the transfer roller 4 to form an image.

The non-transferred toner 14c remaining on the recording member 1 without being transferred is removed by the cleaning blade 9 onto the recording member 1.
The toner particles are removed from above, fall and accumulate in the waste toner receiver 13 due to gravity, and are further collected into a waste toner container (not shown) by rotation of the screw 12.

2 and 3 illustrate calculation results of the magnetic flux distribution and magnetic force distribution by the magnetic field selling means 11 of the embodiment shown in FIG. 1, respectively. The circles in the figure indicate calculation points every 1 m on the top, bottom, left, and right, and the direction of the line segment extending from there represents the direction of magnetic flux and magnetic force, and the length of the line segment indicates its size. Each time the diameter of the circle increases by one level, the size of each circle increases by four times.

Here, the magnetic force is, when toner particles exist in space,
The force exerted by the magnetic field on the toner particles is expressed as gravitational acceleration IG. The toner used in the calculation has a magnetization amount of 50m/
If the amount of toner magnetization is larger than this value, the magnetic force increases, and if it is smaller, the magnetic force decreases.

The magnetic field distribution and magnetic force distribution shown in FIGS. 2 and 3 bring the following advantages to the image recording apparatus of the present invention.

The toner 14 is coupled in a chain in the direction of the magnetic flux shown in FIG. 2, which is generated by the magnetic field generator 11 in the hopper 6. The toner chained together flows out from the tip of the recording electrode 5 due to the conveying force of the recording member 1, and even if some of the chained bonds are broken, the magnetic field means 11 is generated. Since the toner is attracted toward the recording electrode 5 by the magnetic force shown in FIG. 3, chain-like recombination of the toner is quickly performed.

Although the toner 14 is stored in an irregular amount in the toner hopper 6, the toner stably flows out from the tip of the recording electrode due to the above-described action.

Most of the non-image toner flowing out from the tip of the recording electrode 5 begins to fly to the sleeve 3 from directly below the recording electrode 5 due to the magnetic force shown in FIG. completely removed.

According to this embodiment, since non-image toner is immediately removed, there is no charge transfer from the charged toner that forms the image, resulting in a high-quality toner image with clear image outlines, high black density, and no fogging. can be obtained.

Furthermore, according to this embodiment, since a magnetic attraction force that overcomes gravitational acceleration is always applied to the tip of the recording electrode 5, the toner 14 does not accumulate on the downstream side of the tip of the recording electrode 5, and recording is always performed from a fixed position. can do.

In addition, since the non-image toner is removed by magnetic means at the tip of the recording electrode 5, the removal force can be set to be more uniform in the recording width direction than the removal force from a vacuum source, air source, etc. The means can also be made into a simple device.

Here, the angle of the magnetic flux 11a at the tip of the recording electrode 5 shown in FIG. 2 is tilted approximately 10 inches upstream in the recording direction with respect to the normal to the recording member 1 from the surface on the recording member 1. In order to obtain a good image, it is necessary to set the magnetic flux angle within ±45° with respect to the normal line of the recording member 1, and it is desirable to set it within ±15° to obtain higher image quality.

The magnetic field generating member 11 that satisfies the above conditions and stabilizes the toner transport in the hopper has a magnetic field on the side of the recording electrode 5 that is closer to the magnetic field than the distance between the pair of magnetic poles that supplies the strongest magnetic field to the tip of the recording electrode 5. The distance between the extreme end and the tip of the recording electrode 5 is short, and the straight line connecting the paired magnetic poles and extending in the direction of the recording electrode does not intersect the recording member 1, or if it intersects, its position is closer to the tip of the recording electrode 5. Preferably, it is on the upstream side in the recording direction.

Furthermore, the magnetic force 11b at the tip of the recording electrode 5 shown in FIG. 3 has a value of approximately 13G, but if this magnetic force becomes excessive, the amount of non-image toner will increase compared to the amount of image-forming charged toner. The magnetic force 11b at the tip of the recording electrode 5 is preferably
It is 50G or less.

On the other hand, in order to sufficiently remove non-image toner from the recording member and obtain a high-quality image without fogging, it is preferable that the magnetic force be as strong as possible. In this embodiment, the shortest distance between the recording member 1 and the magnetic field generating hand 11 is made shorter than the shortest distance between the recording electrode 5 tip and the magnetic field generating hand to prevent an excessive increase in the magnetic force at the recording electrode 5 tip. However, by increasing the magnetic force on the recording member 1, it is possible to sufficiently remove non-image toner, thereby obtaining a high-quality toner image.

Furthermore, according to this embodiment, since the recording electrode 5 is inclined so that the tip of the recording electrode 5 is located on the downstream side, the downstream space created by the recording electrode 5 and the cylindrical recording member 1 is set large. can do.

The space expanded toward the downstream side allows the first magnetic field generating member 11 built in the cylindrical sleeve 3 to be placed close to the tip of the recording electrode 5, so that the first magnetic field generating member 11 built in the cylindrical sleeve 3 can be placed close to the tip of the recording electrode 5. Also, the above-mentioned necessary magnetic force can be obtained at the tip of the recording electrode 5.

FIG. 4 shows a second embodiment of the present invention, which differs from the first embodiment shown in FIG. 1 in that a second magnetic field generating member 15 is added. That is, the second magnetic field generating means 15 has a saturation magnetic flux density of 0.4, for example.
A magnetic pole facing toward the recording member 1 and a magnetic pole opposite to the recording member 1 are installed.

FIG. 5 schematically shows the magnetic flux distribution of the embodiment shown in FIG. 4.

The second embodiment shown in FIG. 4 is used when the amount of magnetization of the toner 14 is large and the magnetic force generated by the first magnetic field generating member 11 acts excessively, or when the recording speed is relatively high. This is particularly effective when excessive conveying force is applied. That is, the second magnetic field generating member 16 is used to generate the toner 14 in the hopper 6.
The magnetic flux density at the tip of the recording electrode 5 is further increased as shown in FIG. The relatively increased magnetic flux density improves the electrical connection of the toner between the recording electrode needle 5c and the recording member 1, making it possible to produce a high-quality toner image.

According to this embodiment, the toner conveying force that causes the toner 14 to flow out from the tip of the recording electrode 5 and the magnetic force generated by the magnetic field generating member 11 can be appropriately adjusted.

Higher quality toner images can be obtained.

FIG. 6 shows a third embodiment of the present invention, which is different from the first embodiment shown in FIG. A hollow second sleeve 17 made of a non-magnetic material that surrounds the magnetic field generating hand 16 and the third magnetic field generating hand 16, and a non-magnetic plate 18 that is pressed into contact with the second sleeve are added.

The magnetic force of the third magnetic field generating hand 16 is applied to the non-image toner 1 that was not completely removed by the magnetic field generating hand 11 from the recording member l.
4d is aspirated and deposited on the second sleeve 17. The alternating magnetic field of the third magnetic field generating hand 16 rotates in the direction of the arrow f by a driving means (not shown), or the third magnetic field generating hand 16 that is stationary and the second magnetic field generating hand 16 that rotates in the opposite direction to the arrow f. The conveying force of the sleeve 17 moves the toner 14d from the second sleeve 17 to the plate 18 in the direction of the arrow g. Furthermore, the toner 14d on the plate 18 is
The magnetic force of the magnetic field generating hand 11 of the third magnetic field generating hand 16
It is sucked onto the sleeve 3 at a point where it overcomes this. As described in the explanation of FIG. 1, the sucked toner is conveyed on the sleeve 3 and collected in the hopper 6.

This embodiment is particularly effective when the amount of magnetization of the toner 14 must be set low due to the thermal fixing performance of the toner 14 and the like. That is, the magnetic force of the magnetic field generating hand 11 is
Due to the physical space limitations of the sleeve 3, it cannot be made larger than necessary, and the number of magnetic field generation methods required for toner with low magnetization is limited.
1 cannot generate a sufficient magnetic attraction force, the magnetic field generating hand 11 and the third magnetic field generating hand 16 are inserted from above the recording member 1.
By the cooperative operation of the two, it is possible to obtain a higher quality toner image without fogging.

FIG. 7 shows a fourth embodiment of the present invention, in which a magnetic field generating arm 111 is further added to the magnetic field generating arm 11 of the first embodiment shown in FIG.

The magnetic field generating hand 111 adjusts the magnetic attraction force on the recording member 1, attracts the non-image toner 14d that could not be removed by the magnetic field generating hand 11 onto the sleeve 3, and produces a high quality image without fogging. This is to obtain a toner image. In addition, the magnetic force on the sleeve 3 is also adjusted to improve toner conveyance on the sleeve 3.

This embodiment provides an image recording device that is smaller than the third embodiment.

FIG. 8 shows a fifth embodiment of the present invention, which differs from the embodiment shown in FIG. This is what I did. FIG. 9 shows a magnetic field generation device 112 of the fifth embodiment.
This figure shows the magnetic flux density distribution of .

The magnetic field generating member 112 is a cylindrical permanent magnet installed stationary relative to the main body of the image recording apparatus, and includes a magnetic pole 113 facing the recording electrode 5 and a magnetic pole close to the position where the scraper 8 contacts the sleeve 3. 114 has the same magnetic pole. Also, from the magnetic pole 113 to the direction opposite to the arrow a in the figure, the magnetic pole 11
4, it is not magnetized and the magnetic pole 113 is not magnetized.
Different magnetic poles are alternately arranged in the direction up to the magnetic pole 114.

This embodiment is particularly effective in conveying the toner on the scraper 8 well. That is, since the magnetic poles 113 and 114 are the same magnetic pole, the magnetic flux near the top of the scraper 8 is canceled out, and the magnetic attraction force toward the magnetic field generation member 112 that acts on the toner on the scraper 8 is reduced or eliminated. , the toner can be transported well toward the hopper 6 on the scraper 8.

In the figure, the number of magnetic poles is seven, but as long as the toner on the sleeve 3 can be conveyed, there is no problem whether the number of magnetic poles is less than seven or more than seven.

〔Effect of the invention〕

According to the present invention, since the magnetic field generating member is disposed within a rotatable hollow sleeve made of a non-magnetic material, which is installed on the recording electrode side with respect to the recording member on the downstream side of the recording electrode, high-quality toner images can be obtained. can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the present invention, and is a sectional view of the device viewed from the side. 2 and 3 are diagrams showing the magnetic flux distribution and magnetic force distribution of the embodiment shown in FIG. 1, respectively. FIG. 4 is a diagram showing a second embodiment of the present invention, and FIG. 5 is a diagram schematically showing the magnetic flux distribution of the second embodiment shown in FIG. 4. FIG. 6 is a diagram showing a third embodiment of the present invention. FIG. 7 is a diagram showing a fourth embodiment of the present invention. 8th
This figure shows a fifth embodiment of the present invention, and FIG. 9 is a diagram of the magnetic flux density distribution of the magnetic field generating hand of the fifth embodiment shown in FIG. 8. 1... Recording member, 3... First sleeve, 5...
Recording electrode, 6... hopper, 11... magnetic field generation device,
14... Conductive magnetic toner, 4... Transfer roller, 1
5...Second magnetic field generation hand, 2...Recording paper, 16.
...Third magnetic field release 1 (2) 50θq11asJ 2σθtt qauss ・-m-- tos-p and 51n /θq □ 4ρq・- /z0qF- Δ4θq■- Day χ

Claims (1)

[Scope of Claims] 1. A recording electrode in which a plurality of recording electrode needles are arranged in a row, a cylindrical or cylindrical recording member that rotates with a minute gap between the recording electrode, and the recording electrode. means for supplying conductive magnetic toner to the upstream side in the direction of movement of the recording member, and by applying a recording voltage to the plurality of recording electrode needles according to an image signal, the gap is filled by the movement of the recording member. In an image recording apparatus that selectively charges the conductive magnetic toner passing through a section and obtains a microscopic image of the charged toner, each of the recording electrode and the recording member is located downstream of the recording electrode in the recording direction. a hollow sleeve made of a non-magnetic material that is rotatably provided in close proximity to and spaced apart from the sleeve; a magnetic field generating means that is provided in a hollow portion within the sleeve in the arrangement direction of the recording electrodes and generates a silent magnetic field; An image recording device comprising: a rotating means for rotating the image recording device. 2. In the image recording apparatus according to claim 1, the magnetic field generating means is a rod-shaped permanent magnet, and the non-image toner that has passed through the minute gap between the recording electrode and the recording member is directed to the outer periphery of the sleeve. An image recording device characterized in that it generates magnetic force sufficient for attraction. 3. In the image recording apparatus according to claim 1 or 2, the magnetic field generating means generates a magnetic force for the toner that overcomes a gravitational field, and adjusts the outflow of the toner from the minute gap so that the tip of the recording electrode An image recording apparatus characterized in that the toner forms a connected state from the toner toward the recording member, and generates a magnetic force that attracts non-image toner that has passed through the minute gap to the outer periphery of the sleeve. 4. The image recording apparatus according to claim 1, further comprising means for collecting the toner trapped on the outer periphery of the sleeve into the hopper. 5. A recording electrode in which a plurality of electrode needles are arranged so as to intersect with the direction of movement of the recording member, the recording member that moves with a minute gap with the recording electrode, and the upstream side of the recording electrode in the direction of movement. a hopper that deposits magnetic toner on the recording member and supplies the toner to the minute gap by moving the recording member; and a hopper that applies a voltage corresponding to the image to be recorded to the recording electrode to deposit the toner portion in contact with the recording member. a charging driver; a cylindrical sleeve made of a non-magnetic material provided downstream in the moving direction of the recording electrode in a space formed by the recording electrode and the recording member; A magnetic field generating means for assisting the stable outflow of the toner from the minute gap and absorbing the uncharged toner immediately after passing through the minute gap onto the outer periphery of the sleeve, and a means for rotating the sleeve. An image recording device characterized by: 6. A rotatable cylindrical or cylindrical electrode body in which a recording portion is formed by providing a dielectric layer on the outer peripheral surface of a conductive non-magnetic material, and a micro gap between the electrode body and the dielectric layer. A recording electrode provided on the electrode body to supply conductive magnetic toner to a recording area composed of a recording electrode having a large number of recording electrode needles facing each other, the tip of the recording electrode, and the dielectric layer. a toner depositing means for rotating the electrode body; a means for rotating the electrode body; a sleeve made of a magnetic material; and a sleeve disposed within the sleeve to stably supply the toner to the recording area and to assist the outflow of the toner in order to fill the microgap with the toner; a magnetic field generating means for attracting non-image toner that is not attracted to the recording member by electrostatic force above a certain level to the outer periphery of the sleeve; and means for rotating the sleeve to convey the toner attracted to the outer periphery of the sleeve. A voltage is selectively applied between the recording electrode and the electrode body in accordance with the image to be recorded, and the toner in the recording area and in contact with the recording member is selectively transferred to the recording member. An image recording device characterized by comprising a driver for adsorption. 7. In the image recording apparatus according to claim 5, in the moving direction of the recording member and on the upstream side of the moving direction of the hopper, a magnetic pole having a polarity opposite to a magnetic pole facing the recording electrode of the magnetic field generating means is provided for the recording. The second one installed facing the member.
An image recording device characterized in that it is provided with a magnetic field generating means. 8. The image recording apparatus according to claim 1 or 2, further comprising: further adsorbing toner on the recording member that does not contribute to image formation and has a weak adsorption force to the recording member on the downstream side of the sleeve in the recording direction; An image recording device characterized by being provided with an unnecessary toner removing means. 9. The image recording apparatus according to claim 2, wherein magnetic field generating means for adjusting a force for attracting the non-image toner to the outer periphery of the sleeve is provided in the sleeve, separately from the permanent magnet. Recording device. 10. A rotatable cylindrical or cylindrical recording member having a uniform dielectric layer formed on its outer circumferential surface, the tip of which has a minute interval from the outer circumferential surface of the recording member in the axial direction of the recording member. a recording electrode having a large number of electrode needles uniformly arranged on the recording electrode; a means for depositing conductive magnetic toner and supplying the toner to a recording area formed by the recording electrode tip and the recording member; and the recording member. and a hollow non-magnetic body disposed on the downstream side of the recording electrode in the rotational direction of the recording member and in close and non-contact with the recording electrode and the outer peripheral surface of the recording member. a magnetic field generating means disposed within the sleeve and having a circular cross section; a means for rotating the sleeve; An image recording apparatus comprising: a driver that applies a potential to charge a toner portion in contact with the surface of the dielectric layer in the recording area. 11. The image recording apparatus according to claim 10, further comprising a conveyance means for conveying the toner trapped on the outer periphery of the sleeve to the toner supply means. 12. The image recording apparatus according to claim 11, wherein the rod-shaped magnetic field generating means with a circular cross section has a magnetic pole facing the recording electrode and a magnetic pole close to the conveying means, and that the two magnetic poles An image recording device characterized in that there is no magnetic pole different from the magnetic pole between the two.