JPS60263962A - Image recording device - Google Patents

Abstract

PURPOSE:To prevent a control device from being clogged by bounding toner of a two-component developer with an AC electric field, passing it under the control of the controller, and forming a toner image on a recording medium. CONSTITUTION:When an AC voltage is applied between a base electrode 25 and a developer carrier 21 from an AC power source 30, toner T is bounded between the electrode 25 and carrier 21. At this time, a signal independent for every couple of segment electrodes is applied from a signal power source 32 to signal electrodes 23a and 23b, then the toner T is allowed to pass through a slit 26 of every couple for picture elements. At this time, an acceleration voltage is applied between a back electrode 29 and the electrode 25 to accelerate the toner T, which sticks on the recording medium 28 to form a toner image 27. In such a case, the developer in use is preferably the two-component developer consisting of insulating carriers with high resistance and conductive toner.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to an image recording device that uses an electric field, and particularly an image recording device that directly forms a recorded image by controlling the passage of toner through an opening of a control device using an electric signal from an image. It is used for facsimile, computer output, etc. [Prior Art] Conventionally, such an image recording apparatus is disclosed in, for example, US Pat. ．． 6
No. 89.935. FIG. 1 is a sectional view of an image recording apparatus for explaining in detail the invention described in the US patent. In the figure, toner T in a toner supply device 1 passes through an anomaly 7 provided on a signal electrode 4 of a control device 3 due to the action of an electric field, and is transferred to a recording medium 11.
It will stick to the top. Here, the control device 3 includes an insulating layer 6 and a signal electrode 4 formed on one surface of the insulating layer 6.
, a base electrode 5 formed on the other surface, and an aperture through which toner passes. The signal electrode 4 is composed of a group of mutually insulated segment electrodes in order to receive electrical signals for each pixel constituting an image, and the aperture is provided for each segment electrode. When the toner from the toner supply bag M1 toward the recording medium 11 passes through the aperture, the lead wires 9 and 1
0, a toner image is formed on the recording medium 1. However, in the invention of the above US patent, toner T
However, there remained a serious obstacle to practical application of the apertures due to their adhesion and accumulation in the apertures, causing clogging. For example, in JP-A-58-44457, an insulating magnetic toner T constituting a -component developer is used, and an AC bias voltage is applied between the toner supply device 1 and the control device 3. An image recording device that makes the toner T move dynamically has been proposed. It is described that in this recording apparatus, the moving toner T has the effect of cleaning the aperture of the control device and alleviating the clogging phenomenon. However, since the recording device described in the above-mentioned publication uses a one-component developer consisting of insulating magnetic toner T, toner of opposite polarity that does not contribute to development due to friction with the device or friction between toner particles. Also, this adheres to the aperture of the control device 3 and tends to cause clogging. Furthermore, in the case of a -component type developer, the amount of triboelectric charge of the toner T is originally small. Therefore, in order to make the toner T adhere to the recording medium 11, the toner supply device 1. Control device 3 and recording body 11
It becomes necessary to apply an excessive voltage to the toner, and as a result, charges tend to leak, resulting in problems such as image unevenness, the moving speed of the toner T being slow, and high-speed development becoming difficult. [Object of the Invention] An object of the present invention is to provide an image forming apparatus that eliminates the drawbacks of the conventional example, and at the same time, can stably supply toner and form a stable image for a long period of time. [Structure of the Invention] The object is to provide a supply source for supplying toner, a control device having a signal electrode and a base 11th via an insulating layer, and having an opening through which the toner passes, and a control device having an opening through which the toner passes. Receive toner

[J] In an image recording apparatus equipped with a recording medium, the toner supply source preferably has a developer carrier carrying a two-component developer containing a high-resistance magnetic carrier; means for forming a first electric field between the developer carrier and the control means to direct the toner toward the control means; (b) means for controlling passage of the toner between a signal electrode and a base electrode of the control device; (c) means for forming a third electric field that directs the toner toward the recording medium between the control means and the recording medium. In the above structure, the present invention preferably uses a two-component developer consisting of a high-resistance magnetic carrier and an electroscopic toner, and controls the toner by making the toner in the developer vibrate under a high oscillating electric field. to the control device that allows it to pass through.
3. Fast toner. The key point is that a stable image is formed directly on the recording medium by supplying it uniformly and in large quantities for development. The configuration of the image recording apparatus of the present invention will be explained below with reference to FIGS. 2 to 5. 2 is a sectional view schematically showing the image recording apparatus of the present invention, FIG. 3 is a plan view of the control device in the recording apparatus of FIG. 2, FIG. 4 is a sectional view taken along line A-A in FIG. The figure shows a wiring diagram of the control device of FIG. In FIG. 2, 21 is a developer carrier, which is an insulating carrier K.
and toner T. B is a control device, which is provided with a signal electrode n on the upper side of the paper and a continuous base electrode and pole 5 on the lower side through an insulating layer. 26 is a slit for passing the toner T, and the signal electrode A, the insulating layer 5 and the base electrode 5 are divided by the slit 26 into signal electrodes 23a and 23b, insulating layers 24a and 24b, and base electrodes 5a and 25b, respectively. It is being Further, the signal electrodes Z3a and 23b are composed of a mutually insulated segment electrode group, and the segment electrode group is configured so that an independent signal voltage can be applied to each segment electrode or to each set of a plurality of segment electrodes. has been done. Here, the segment electrode groups are arranged facing each other as shown in FIGS. 3 and 4. Next, in FIG. 2, the opening recorder is placed in close contact with the back electrode device. t! is connected to the base electrode 5 and the developer carrier 21 by AC 1fE1, 31 is a DC power source and is connected to the back electrode unit and the base electrode 5, and 32 is a signal power source, which connects the signal electrode field and the base electrode t! It is connected to lA25. In addition, FIG. 5 shows the signal power supply 3 of the opposing signal electrodes in FIGS. 3 and 4.
2 is a wiring diagram. In the figure, signal electric fi! Segment electrode group C''l + 82 + aB that constitutes 23a
+a4''・) and the segment electrode groups [bl, b7.b3.b4...] constituting the signal electrode 23b are connected to independent signal sources for each set of opposing segment electrodes. The operation of the recording apparatus will be explained with reference to FIGS. 2 and 5. An AC voltage or a DC induced AC voltage is applied between the base electrode 5 and the developer carrier 21 in FIG. 2 by an AC power source (9). As a result, the toner T begins to move between the base electrode 5 and the developer carrier 21.At this time, independent signals are transmitted from the signal power source 32 to the signal electrodes 23a and 23a for each set of opposing segment electrodes in FIG. 23b, the moving toner T is allowed to pass through the slits 26 group by group corresponding to the pixels.At this time, the toner T is applied between the back electrode device and the base electrode 5 in FIG. An accelerating voltage is applied from the DC power source 31 to accelerate the toner, and it adheres to the recording medium to form a toner image n.The toner image is then fixed by pressure or heating. What passes is Base Electric & 2
5 and developer carrier 2] is directed upward in the paper of FIG. 2, and a signal voltage is applied in synchronization with this. FIG. 6 shows segment electrode groups Cat + az + , a
s...an') and (b, , b2. b,
, b4''-・bn) are arranged in a staggered manner with slots and gates 26 in between. Wiring a or chain 1
By switching and recording via the wiring 33b and the electrode switching control circuit A, a toner image with high image power can be obtained. That is, when recording the first line, one dot is placed on the electrode a1 +
32 + b2, the combination is segment electrode aI + "2 + b2, and then, to form one dot between electrodes a8.a8.b3, segment electrode "2 + a3 l An image is formed by applying signal voltages such as the combination of (b) and (b). Thus one line of recording was performed using the segment electrode [al. a2. a3””” an) and (b, , b2. b
s, b4-・"bn] (formed by D combination. FIG. 7 shows a segment electrode group CS+, 82, Ss, S4 in which signal electrodes n are insulated from each other by an insulating layer T).
. . .Sn], and each segment electrode has an aperture, and the wiring 3
3 is connected to the signal power source 32. tj In FIG. 2, when the toner T is negatively charged, the signal voltage from the signal power source 32 is negative or zero applied to the base electrode 5 and positive to the signal electrode B. Also DC power supply 3
The accelerating voltage from 1 is applied negative or zero to the base electrode and positive to the back electrode. Further, the base electrode 5 is normally grounded. When the toner T is positively charged, the polarity of the applied voltage is reversed. Next, the developer, which is an important feature of the present invention, will be explained below. In the following description, the average particle diameters of carriers and toners are all expressed as weight-average particle diameters. In the present invention, a developing roller having an internal magnetic roller or a developing roller having a sleeve made of a magnetic body is used as the developer carrier 21, and magnetic particles are often used as the carrier. In such a case, if the average particle size of the magnetic carrier particles is generally large, ■Developer carrier 2
Because the condition of the magnetic brush ears formed on 1 is rough,
Even if toner is supplied to the control device B while being vibrated by an electric field, unevenness tends to appear in the toner image formed on the recording medium surface, and a high-density toner image cannot be obtained because the toner concentration at the ears becomes low. Problems such as this occur. In order to solve this problem, the average particle size of the carrier particles can be reduced, and as a result of experiments, the effect begins to appear when the average particle size is 50 μm or less, and especially when the average particle size is 30 μm or less, the effect of
It was found that the problem no longer occurs. Further, the @ problem can also be solved by making the magnetic carrier finer particles, which increases the toner concentration in the ears, making it possible to obtain a high-density toner image. However, if the carrier particles are too fine, they may adhere to the control device n and the recording medium together with the θ toner particles, or they may become easily scattered. These phenomena are also related to the strength of the magnetic field acting on the carrier particles and the resulting magnetization strength of the carrier particles, but in general, a tendency gradually becomes apparent when the average particle size of the carrier particles becomes 15 μm or less. At first, it becomes noticeable at a thickness of 5 μm or less. and,
There is a problem that some of the carrier particles adhering to the control device n move onto the recording body array together with the toner, and some of them clog the opening of the control device n. The problems associated with the adhesion of the carrier to the control device η and the four surfaces of the recording medium as described above can be prevented by increasing the electric field strength of the oscillating electric field during toner supply and suppressing the transfer of the carrier to the control device n and the road surface of the recording medium. However, the electric field strength between the control device n and the developer carrier 21 at this time becomes extremely high. In other words, a superimposed oscillating voltage of several hundred volts to several kilovolts is applied between the developer carrier 21 and the control device η, and the gap between the control device n and the developer carrier 21 is 100 μm to 2 mm. (in the meantime) 103
A strong electric field of 104v/7F+ will be generated. In order to perform development under such conditions, it is necessary that no charge is injected into the carrier particles even in a high electric field, and therefore a high electric field is required, which is not required when toner is supplied by a normal magnetic brush. Even below, carrier particles with extremely high electrical resistance are required. According to the results of studies conducted by the present inventors, in order to provide a sufficient oscillating electric field, it is desirable that the carrier particles have a high resistance of 108 Ωm or more, preferably 1013 Ωm or more under an electric field of 10' V/c1n. This resistivity is 1 kg 1 cr! on the packed particles after the particles are placed in a container with a cross-sectional area of 0.50i and tapped. Apply a load of 102~! between the load and the bottom electrode. This value is obtained by reading the current value when a voltage that generates an electric field of 1 VEtn is applied, and the thickness of the carrier particles at this time is about 1 mm. That is, under any electric field in the range of 102 to 6η, it is 108Ω (7) or more, and even 101
It is preferable that it is 3Ωα or more. If this resistivity is low, when a bias voltage is applied to the developer carrier 21, flL charges are injected into the carrier particles, making it easier for the carrier particles to adhere to the control device η and the recording body array surface, or the bias voltage Voltage breakdown may occur more easily. Furthermore, even when carrier particles having the above composition are used, it is inevitable that some small carrier particles will adhere to the recording medium during toner supply, but this problem is caused by the use of magnetic carrier particles such as resin, etc. This problem can be solved by forming it together with a substance that can be fixed on the recording body.・In other words, by coating magnetic particles with a substance that can fix the magnetic carrier particles on the recording body, or by forming the magnetic carrier particles with a substance that can be fixed on the recording body containing dispersed magnetic powder, recording can be achieved. Carrier particles adhering to body passages are also fixed by heat and pressure. The carriers that adhere to the recording body portion as described above are usually small particles of 5 μm or less. However, even if it is unavoidably attached, if the carrier has a resin component, it will be fixed together with the toner image and will not cause any major trouble. From the above, the average particle size of the magnetic carrier is 50 μm.
Below, the appropriate conditions are particularly preferably 308 m or less and 5 μm or more, and it is also preferable that the magnetic carrier particles contain a substance that can be fixed on the recording medium. Incidentally, the average particle size is a weight average particle size and was measured using a Coulter Counter (manufactured by Coulter Co., Ltd.). Such magnetic carrier particles have iron as the magnetic material, similar to that in conventional magnetic carrier particles. Metals such as iron, nickel, and cobalt, or their compounds and alloys, such as triiron tetroxide, r-ferric oxide,
Dioxide, manganese oxide, ferrite, manganese
Particles of ferromagnetic or paramagnetic substances such as copper alloys, or the surfaces of these magnetic particles are coated with styrene resins, vinyl resins, ether resins, silicone resins, rosin-modified resins, acrylic resins, polyamide resins, Particles obtained by coating with resin such as epoxy resin or polyester resin or fatty acid wax such as valmitic acid or stearic acid, or by making resin or fatty acid wax particles containing dispersed magnetic particles, It is obtained by particle size selection using a conventionally known average particle size classification method. Further, the carrier used in the method of the present invention is preferably sphericalized by a known method. Forming the carrier particles into a spherical shape not only improves fluidity, but also makes the developer layer formed on the developer carrier 21 uniform, and also makes it possible to apply a high bias voltage to the developer carrier 21. It also gives the effect of In other words, the fact that the carrier particles are made spherical by resin etc.
■Generally, carrier particles tend to be magnetized and attracted in the long axis direction, but when they become spherical, this directionality disappears, and therefore the developer layer is formed uniformly, resulting in local areas of low resistance and uneven layer thickness. (1) As the resistance of the carrier particles increases, the edge portions found in conventional carrier particles disappear, and the electric field no longer concentrates on the edge portions, resulting in a high bias on the developer carrier 21. Even if a voltage is applied, the effect is that the toner that is discharged to the control device n will not be disturbed or the voltage will not break down. The fact that this high bias voltage can be applied means that when toner supply under an oscillating electric field in the present invention is performed by applying an oscillating bias voltage, it is possible to fully exhibit the effects described below. It means that it can be done. To summarize the above, the gearia particles used in the present invention have an average particle size of 5 to 50μ? It is preferable that the resistivity is 108 Ωm, preferably 1013 Ωcm or more even under the electric field of Q'VAYn. With spherical magnetic particles and resin-coated gears,
Select magnetic particles or spherical particles and apply a resin coating treatment to them. For carriers with magnetic particle dispersion, use as many magnetic particles as possible and perform spheronization treatment after forming the dispersed resin particles. Alternatively, it can be manufactured by obtaining dispersed resin particles by a spray drying method. Next, regarding toner, as the average particle size of toner particles becomes smaller, the amount of charge qualitatively decreases in proportion to the square of the particle size, and the adhesion force such as van der Waals force increases. This may make it difficult for the toner particles to separate from the carrier particles, or the toner particles may
It adheres to the surface and blocks the openings such as the slits 5. In the present invention, the developer carrier 21 and the control device n
An oscillating electric field is applied between them to make the toner particles vibrate, making it easier for the toner particles to separate from the developer layer supported on the carrier 21 and less likely to adhere to the control device ρ. This makes it easy to return to the original developing layer from n. However, if the control device becomes contaminated or clogged,
Considering the generation of capri in the toner image formed on the recording medium, the particle size of the toner particles is set to 1 μm or more, preferably 3 μm or more. On the other hand, as the average particle size of the toner increases, as described above, the roughness of the image becomes noticeable. Normally, when obtaining a toner image with resolution arranged at a pitch of about 10 lines/my, there is no practical problem with toner having an average particle size of about 20 μm.
When the following finely divided toner is used, the resolving power is significantly improved, and it becomes possible to provide clear, high-quality images that faithfully reproduce gradation differences and the like. For the above reasons, the average particle size of the toner is 1 μm or more and 20 μm or less, preferably 10 μm or more.
The appropriate condition is μm or less. In addition, in order for the toner particles to follow the electric field, the average charge amount of the toner particles is greater than 1 to 3 μC/11 (preferably 3 to 50 μC/11).
or desirable. Particularly when the particle size is small, a large amount of charge is required. Such toner can be obtained in the same manner as conventional toner. That is, it is possible to use a toner in which spherical or amorphous nonmagnetic or magnetic toner particles in conventional toners are sorted by an average particle size sorting means at °C. Among these, it is preferable that the toner particles are magnetic particles containing magnetic particles, and in particular, the IJ of the magnetic fine particles is 60.
Heavy k1. It is preferable not to exceed %. When the toner particles contain magnetic particles, the developer transport body 2
Since the magnetic brush is influenced by the magnetic force of the magnet included in 1, the uniform formation of the magnetic brush is further improved, fogging is prevented, and toner particles are less likely to scatter. However, if the amount of magnetic material contained is too large, the magnetic force between it and the carrier particles becomes too large, making it impossible to obtain a sufficient toner image.
Magnetic particles also appear on the surface of the toner particles, making it difficult to control triboelectrification, making the toner particles more likely to be damaged, and making them more likely to aggregate with carrier particles. In particular, when using color toner, the amount of magnetic material must be less than (9)% by weight to obtain clear colors. To summarize the above, the preferred toner for the developer used in the image recording device of the present invention is to use the resin mentioned above for the carrier and furthermore fine particles of magnetic material, and to add a coloring component such as carbon and, if necessary, a charging agent. It consists of particles having an average particle size in the range of 1 to 20 μm, particularly preferably in the range of 3 to 10 μm, and can be produced by a method similar to a conventionally known toner particle production method with the addition of a control agent. Furthermore, spheroidizing the toner brings about improved fluidity and favorable results in stirring, transporting, and charging the developer. In the image recording apparatus of the present invention, it is preferable to use a developer in which carrier particles and toner particles are mixed in the same ratio as in a conventional two-component developer, but it is also possible to use a developer with a higher toner concentration. Applicable. If necessary, a fluidizing agent for improving the fluidity and slippage of the particles and an anti-adhesive agent for preventing the toner from adhering to the control device and the recording medium are mixed, if necessary. As a fluidizing agent, colloidal silica, silicone varnish, metal soap, or a nonionic surfactant can be used, and as an anti-adhesion agent, a surface active agent such as a fatty acid metal salt, an organic group-substituted silicone, or a fluorine-based active agent can be used. Can be used. The above are the conditions regarding the developer, and next, the conditions regarding the developer carrier 21 which forms a developer layer with a developer such as Rt+ and supplies toner to the control device n and the recording medium path will be described. A developer carrier 21 similar to that used in a conventional recording device that applies a bias voltage is used as the developer carrier 21. In particular, a rotating developer carrier 21 having a plurality of magnetic poles inside a sleeve on which a developer layer is formed on the surface is used. A structure in which a magnetic body is provided is preferably used. Such a developer carrier 21
In this case, as the rotating magnet rotates, the developer layer formed on the surface of the sleeve moves in an undulating manner, so new developer is supplied one after another, and the developer layer on the sleeve surface is slightly undulated. Even if there is non-uniformity in the layer thickness, its influence is sufficiently covered by the above-mentioned wavy undulations so that it does not become a problem. It is preferable that the developer transport speed due to the rotation of the rotating magnet or the rotation of the sleeve is almost the same as or faster than the moving speed of the recording body array. Further, it is preferable that the rotation of the rotating magnet and the rotation of the sleeve are carried in the same direction. Image reproducibility is better in the same direction than in the opposite direction. However, it is not limited to these. Furthermore, the thickness of the developer layer formed on the developer carrier 21 is as follows:
It is preferable that the thickness is such that the adhered developer is sufficiently scraped off by the thickness regulating blade to form a uniform layer.
The gap between the developer carrier 21 and the control device 22 is 10
The thickness is preferably 0 to 2000 μm. If the surface gap between the development side carrier 21 and the control device n becomes too narrow than 100 μm, it will be difficult to form magnetic brush ears that will uniformly develop the toner particles. If the gap greatly exceeds 2000 .mu.m, the opposing electrode effect will deteriorate and sufficient toner supply will not be obtained. In this way, when the gap between the developer carrier 21 and the control device B becomes extreme, it becomes impossible to make the thickness of the developer layer on the developer carrier 21 appropriate.
In the range of .mu.m, the thickness of the developer layer can be formed appropriately. Therefore, it is necessary to set the gap and the thickness of the developer layer to conditions such that the ears of the magnetic brush do not come into contact with the surface of the control device r#B and are as close as possible to the surface of the control device r#B under the condition that no oscillating electric field is applied. Particularly preferred. Furthermore, the toner supply under the oscillating electric field is carried out by the developer carrier 21.
Preferably, by applying an oscillating bias voltage to the sleeve. Further, it is preferable to use a bias voltage that is a combination of a direct current voltage that prevents toner particles from adhering to the base electrode or non-image area, and an alternating current voltage that makes it easier for the toner particles to separate from the carrier particles. However, the present invention is not limited to the method of applying an oscillating voltage to the sleeve or the method of applying a superimposed voltage of DC and AC. [Example] Examples of the present invention will be specifically described below with reference to FIGS. 8 to 11. 8 is a sectional view of a main part of the recording device of this embodiment, FIG. 9 is a partial perspective view of FIG. 8, FIG. 10 is a sectional view showing a modification of the toner supply device of FIG. 8, and FIG. The figure is number 8
FIG. 7 is a diagram showing another modification of the toner supply device shown in the figure. In FIGS. 8 and 9, 40 is a toner supply device.
2 is a sleeve made of non-magnetic material such as aluminum; 4 is a sleeve made of a non-magnetic material such as aluminum;
3 is provided inside the sleeve 42 and has a plurality of N,
The sleeve 42 and the magnet 43 constitute a developer carrier, which is a magnet having an S magnetic pole in the circumferential direction. The sleeve 42 and the magnet body 43 can rotate relative to each other, and the figure shows that the sleeve 42 rotates in the direction of the arrow. In addition, the N and S magnetic poles of the magnet body 43 are usually 500 mm.
It is magnetized to a magnetic flux density of ~1500 Gauss, and its magnetic force forms a developer layer, ie, a magnetic brush, as described above, on the surface of the sleeve 42. 44 is a regulating blade made of magnetic or non-magnetic material that regulates the height and amount of the magnetic brush; 45 is a cleaning blade that removes the magnetic brush that has passed through the developing area A from above the sleeve 42; Since the surface of the sleeve 42 comes into contact with the developer reservoir in the developer reservoir 41, the developer reservoir is thereby supplied, and the developer reservoir 46 stirs the developer reservoir in the developer reservoir 41 to make the components uniform. It is a stirring screw. Developer reservoir 4
Since the toner particles in the developer reservoir 1 are consumed when development is performed, 47 is a toner hopper for replenishing the toner particles T as described above, and 48 is a developer reservoir 41. It is a supply roller having four parts on the surface onto which the toner T is dropped. The outer diameter of the sleeve 42 is 30 mW, and the outer diameter is 6 mW in the direction of the arrow.
It is rotated at a speed of 5r, p, m. The gap between the regulating blade 44 made of a non-magnetic material and the sleeve 42 is 300 mm.
μm, magnetic flux density 900 Gauss N, S magnetic poles 8
The rotation speed in the direction of the arrow of the magnet body 43 having poles at equal intervals is:
700r, p, m. The developer used is a resin with a weight average particle diameter of 30 μm and a specific resistance of I x 10”Ω, which contains magnetic powder dispersed in the resin.
The developer is a two-component developer consisting of an insulating magnetic carrier having a weight average particle size of 14 μm and a negatively charging insulating magnetic toner having a weight average particle size of 14 μm. A developer layer having a thickness of 600 μm was formed in the recording area 49 on the sleeve 42 . An opening is provided in the front wall blade of the toner supply device 40, and a control device 52 is disposed while being supported by a support member 51. The control device 52 is composed of a signal electrode & an insulating layer 54, a base electrode 55, and a slit 56, and the width of the slit is maintained by a spacer (not shown).
It is assumed to be μm. The insulating layer is sandwiched between both electrodes 53 and 55, and has a thickness t2 of 100 μm. The signal electrode 53 is divided into signal electrodes 53a and 53b opposite to each other through the slit. Each of these divided signal electrodes 53a and 53b is composed of a group of mutually insulated segment electrodes that receive independent signals, and each is independently connected to a signal source 65, which will be described later. These segment electrode groups are arranged at a density of 8 pieces and 4 m, and are A4 width (279 mm).
), it becomes 2376 digits. Between the base electrode 55 of the control device 52 and the sleeve 42 of the toner supply device 40 1
t+ is in the range of 100 to 2000 μm, and is set to 800 μm here. Also, the back electrode 6 described later
The gap t4 between the sleeve 42 and the sleeve 42 is 1500 μm. A feeding guide plate 57 for the recording body 59 is provided close to the control device 52 to maintain a constant gap t3 between the recording body 59 and the control device 52 and to stably transport the recording body 59. Acts as a guide. The guide plate 57 has an opening and also serves as a guide to accurately direct the toner toward the recording medium 59. The recording medium 59 is conveyed in the direction of the arrow at a speed of 5 QB/sec in close contact with a conveyance roll 61 which also serves as a back electrode. Feeding rolls 62 a and 62 that are driven by the transport roll 61 and sandwich and transport the recording medium 59 together with the transport roll 61;
Among the feeding four wheels 62a, the feed four wheels 62a are configured to clamp the outside of the image area so as not to damage the image. Note that the back electrode (
The gap between the transport roll 61 and the signal electrode 53 of the control device 52 was set to about 600 μm. The AC voltage applied from the power supply 64 between the base electrodes 55 of 52 makes them vibrate. The alternating current voltage is 2 KH2, 2 to volts (
(effective value), and a positive DC component of 100 volts is superimposed on this and applied. When the moving toner T is directed toward the control device 52 by the action of an electric field, a signal voltage of, for example, 50 volts with a pulse width of 2 μsec is applied to the control device from the power source 64, and the toner T is slit in the device.
56. Next, the base electrode 55 and back electrode 61 of the control device 52
A positive DC voltage of 250 volts is applied between the power supplies and the toner T adheres to the recording medium 59 to form a toner image. The toner image ω is heated and fixed by a fixing device 63. In this way, a high-resolution, clear image can be obtained on the recording medium 59 at high speed, and a stable image can be obtained for a long period of time without clogging of the control device. FIGS. 10 and 11 are diagrams showing modified examples of horizontal sliding of the developer carrier. That is, in the case of FIG. 8 described above, the sleeve 4
2 rotates in the direction of the arrow, and the magnet body 43 rotates in the opposite direction of the arrow, so that the magnetic flux densities of the N and S magnetic poles are approximately equal, whereas in the device shown in FIG. 42 rotates in the direction of the arrow, but the magnet body 43 is fixed. Further, the magnetic poles facing the cleaning blade 45 are made of overlapping north poles, so that the blade 45 can smoothly scrape off developer residue. In the apparatus of FIG. 11, the fixed magnet body 43ON. The magnetic flux density of the S magnetic pole is not the same, and the magnetic flux density of the N magnetic pole facing the control device 52 is higher than that of the other N and S magnetic poles. As for the magnetic poles facing the control device 52, as shown in FIG. 11, N magnetic poles may be overlapped and arranged to face each other, or N and S magnetic poles may be arranged and opposed to each other. By arranging a plurality of magnetic poles to face each other in this manner, it is possible to obtain the effect that the supply of toner T is more stable than when a single pole is made to face each other. Further, depending on the case, the toner T may be supplied with a sufficient distance between the opposing N and S magnetic poles so that the magnetic brush is in an extended state. [Effects of the Invention] As explained above, a two-component developer consisting of a particularly high-resistance magnetic carrier and an electroscopic toner is used, and the toner supplied from the developer transport carrier supporting the developer is subjected to an alternating current electric field. By creating a recording device in which the toner moves dynamically and is controlled by a control device to pass and form a toner image on the recording medium, it is possible to record high-resolution and clear images on the recording medium at high speed. Furthermore, since clogging of the control device is prevented, stable images can be maintained for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view illustrating a conventionally known image recording apparatus, FIG. 2 is a sectional view schematically showing the recording apparatus of the present invention, and FIG. 3 is a plan view of a control device of the recording apparatus shown in FIG. Figure 4 is the third
5 is a signal wiring diagram of the control device in FIG. 3, FIG. 6 is a signal wiring diagram of another form of control device, and FIG. 7 is a signal wiring diagram of another form of control device. A signal wiring diagram is shown. FIG. 8 is a sectional view showing an embodiment of the present invention, FIG. 9 is a partial perspective view of FIG. 8, FIG. 10 is a sectional view showing a modification of the toner supply device of FIG. 8, and FIG. 9 is a sectional view showing another modification of the toner supply device of FIG. 8. FIG. 21... Developer transport carrier, n, 52... Control device,
Z3.13a, 23b, 53.53a, 53b・
=Signal electrode, 24, 24 a, 24 b, 51
"Insulating layer, 25, 25a, 25b, 55-base electrode, 26.56... slit, 2
7, 60... image, a, 59.
... Recording body, West, 61... Back electrode, 30.64.
...AC power supply, 31.65...Signal power supply, 32.66
...Acceleration power supply, 40...Toner supply device, 57...
- Recording body guide member, 49... Recording area, T... Toner, D... Developer. Agent Patent Attorney Field 1) Father-in-law Fig. 1 Fig. 2 Fig. 2 Fig. 3'j Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 26 lq Fig. 10 Fig. 11

Claims (5)

[Claims] (1) A supply source that supplies toner, a control device that has a signal electrode and a base electrode via an insulating layer, and has an opening that allows the toner to pass through, and a recording body that receives the toner that has passed through the opening. In the image recording apparatus, the supply source for supplying the toner has a developer carrier carrying a two-component developer, and (a) the toner is disposed between the developer carrier and the control device. means for forming a first electric field directed toward a control device; (b) between a signal electrode and a base electrode of the control device;
(c) means for forming a second electric field for controlling passage of the toner; and (c) means for forming a third electric field for directing the toner toward the recording medium between the control device and the recording medium. Features of the image recording device. (2) The image recording device according to claim 1, wherein the signal electrodes of the control device include a group of segment electrodes that are insulated from each other. (3) The image forming apparatus according to claim 1 or 2, wherein the opening through which the toner passes is formed by a groove having uniform gaps in the longitudinal direction. (4) The image forming apparatus according to claim 1 or 2, wherein the opening through which the toner passes is an aperture provided in each of the segment electrode groups. (5) Claim 1, 3 or 4, wherein the two-component developer comprises a high-resistance magnetic carrier and an electroscopic toner.
The image recording device described in Section 1.