JPS59188450A - Recorder - Google Patents

Abstract

PURPOSE:To prevent the deterioration of the quality of recorded pictures by removing toner adhered to a control electrode by applying a voltage having opposite polarity to the charge polarity of the toner to the toner carrier electrode with an adequate timing. CONSTITUTION:During the period when voltage Vp to be applied to a toner carrier electrode 15 is of positive polarity, an electric repulsion acts on between the toner carrier electrode 15 and the toner 22. When voltage of negative polarity is applied to control electrodes 17a and 17b through a switching means 28 from a power source 26, an electric attraction acts on between the toner 22 and the control electrodes 17a and 17b, part of the toner 22 reaches a recording medium 21, and recording is made. When the voltage Vp is of negative polarity, an electric attraction acts between the toner 22 adhered to the control electrodes 17a and 17b and the toner carrier electrode 15, and the toner 22 returns to the toner carrier electrode 15. The toner 22 is removed from the control electrodes 17a and 17b every one cycle of AC voltage by AC power source.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a recording method that performs recording by causing charged solid toner particles to fly towards a recording medium by electric force and adhere to the recording medium 2, -2. Regarding equipment.

Conventional configuration and its problems Recording devices for facsimiles, printers, etc.
It is most desirable to use a non-impact method and use plain paper.

Conventional recording apparatuses that satisfy such conditions include inkjet recording apparatuses, and among them, inkjet recording apparatuses based on an ink-on-demand system have been widely used. This ink-on-demand type inkjet recording device deforms the piezoelectric element by applying an electric signal to change the volume of the ink chamber, thereby transferring ink particles from a nozzle communicating with the ink chamber to the recording paper (ordinary paper). This is a device that records data by flying it even onto paper (paper).

However, in this type of inkjet recording device, (a) The part that directly corresponds to the pixel (hereinafter referred to as the pixel corresponding part) is the nozzle, but the nozzle is provided with an external part to circulate the ink. The diameter becomes larger. Therefore, it is difficult to multiply the pixel corresponding parts.

(b) A piezoelectric element is required for each nozzle,
It is even more difficult to create multiple pixel-corresponding sections corresponding to the width of the recording paper.

There was a drawback.

Unfortunately, some conventional inkjet recording devices use an ink mist method. In this ink mist type ink jet recording device, ink mist is generated by ultrasonic waves, and the ink mist is generated by controlling the ion flow generated by corona discharge with an electric field and passing it through the ink mist layer. It is electrically charged, and the charged ink mist is attracted by a back electrode and sticks to recording paper (plain paper).

In this type of inkjet recording apparatus, the electrodes that control the ion flow serve as pixel-corresponding parts, so it is possible to have multiple pixel-corresponding parts. However, in order to generate the ink mist, an ink tank, a dust collector, a cooler, a recovery ink tank, a pump, and the like are required, resulting in a disadvantage that the apparatus becomes complicated and large.

As a result of intensive research, the inventors of the present invention have developed a recording device as shown in FIG. invented a recording device based on the principle shown.

Next, to explain this, 1 is a toner carrier electrode, and 2 is a toner passage control body. A toner passage gap 4 is formed between the two. Note that the control electrodes 3a and 3b are electrically connected. Reference numeral 6 denotes a back electrode facing the toner carrier electrode 1 with the toner passage gap 4 interposed therebetween. Reference numeral 6 denotes a recording medium such as plain paper that is supplied between the back electrode 5 and the toner passage control body 2, and it is preferable that the back surface of the recording medium is brought into contact with the back electrode 5.

7 is a powdered toner supplied to the surface of the toner carrier electrode so as to form a thin, uniformly thick layer, and these 1.s-7 are electrically charged. Such a layer of toner 7 can be obtained, for example, by applying the toner 7 to the toner carrier electrode 1'' by means of an energized blade 8, as shown in FIG. In addition to the above-mentioned method, the toner 7 can be charged by using a corona charger, or by mixing magnetic toner and non-magnetic toner with different triboelectrification series, as will be described later. A charging method or the like may also be used.

Returning to FIG. 1 again, reference numeral 9 denotes a power source that applies a voltage of the same polarity as the charged polarity of the toner 7 to the toner carrier electrode 1;
1o is a voltage with a polarity opposite to that of the toner 7 on the back electrode 5.
This is the power applied to the Reference numerals 11 and 12 are power supplies that apply voltages of opposite polarity to the control electrode 4, and between these power supplies 11 and 12 and the control electrodes 3a and 3b,
Switching means 13 are inserted.

Next, the operation of this recording device will be explained. In this recording device, the toner 7 may be charged positively or negatively; however, in the following explanation 67, the toner 7 will be described as being positively charged. do.

When a negative voltage is applied to the back electrode 5 by the power source 10 and a positive voltage is applied to the toner carrier electrode 1 by the power source 9, an electrical repulsive force acts between the toner carrier electrode 1 and the toner 7. The toner is removed from the toner carrier electrode 1 (in FIG. 1, the toner 7 is directed upward).Then, the power source 11 is connected to the control electrodes 3a and 3b by the switching means 13, and the control electrode 3a is connected to the power source 11 by the switching means 13.

When a negative voltage is applied to the control electrodes 3b, the toner 7 passes through the gap 4 and reaches the recording medium 6 due to the electric attraction acting between the control electrodes 3a, 3b and the back electrode 5. It is held on the same medium 6 by the electric attraction force acting between them.

Still, the switching means 13 is switched to connect the power source 12 to the control electrodes 3a, 3b, and the control electrodes 3a, 3b
When a positive voltage is applied to the toner 7 and the control electrode 3a,
, 3b, and the toner 7 moves into the gap 4.
become unable to pass through.

Therefore, by controlling the voltage (control voltage) applied to the control electrodes 3a, 3b according to the image signal, it is possible to record a desired image.

Note that the images formed by the toner 7 on the recording medium 6 in two series are then subjected to a fixing process by four suitable means.

As is clear from the above, this recording device allows the use of plain paper without any impact, as described above, does not make the device complicated or large, and the pixel-corresponding section ( Control electrode 3a.

Multiplication of 3b) is also easy.

However, in the configuration shown in FIG. 1, the control electrode 3a
, 3b, and this stuck toner particles mechanically prevent the toner 7 flying from the toner carrier electrode 1 from passing through the toner passing gap 4. At the same time, disturbance occurs due to disturbance of the electric field, resulting in the inconvenience of deteriorating the quality of the recorded image.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and is an object of the present invention, in which the toner adhering to the control electrode is separated from the control electrode in the recording apparatus based on the principle shown in FIG. An object of the present invention is to provide a recording device that can prevent deterioration of image quality.

Structure of the Invention A recording device according to the present invention includes a toner carrier electrode whose surface is supplied with charged powder toner, a toner passage control body having a control electrode, and a toner passage gap provided around the control electrode. a back electrode facing the toner carrier electrode through the toner passage gap; and means for applying a voltage of the same polarity as the charging polarity of the toner and a voltage of the opposite polarity to the toner carrier electrode at different periods. , comprising means for applying a voltage having a polarity opposite to the charged polarity of the toner to the back electrode, and means for applying a control voltage to the control electrode, the toner carrier electrode having a polarity opposite to the charged polarity of the toner. When a voltage of 971 is applied, an electrical attractive force acts between the toner carrier electrode and the toner adhered to the control electrode, causing the toner to separate from the control electrode.

DESCRIPTION OF EMBODIMENTS The present invention will be explained in more detail below based on embodiments shown in the drawings.

FIG. 3 is a schematic side view of a recording apparatus according to an embodiment of the present invention.

In this figure, 16 is a toner carrier electrode, 16 is a toner passage control body, and the toner passage control body 16 is formed between control electrodes 1ya and 1yb facing each other and these control electrodes 17a and 17b. Toner passage gap 19
It has many things. Note that the control electrodes 17a and 17b are electrically connected to each other. 2o is the toner passage gap 19
This is a back electrode facing the toner carrier electrode 16 via the toner carrier electrode 16.

Reference numeral 21 denotes a recording medium such as plain paper that is supplied between the back electrode 2o and the toner passage control body 19.

22 forms a thin, uniformly thick layer on the surface of the toner carrier electrode.
These toners 22 are electrically charged. Such a layer of toner 22 can be obtained by methods such as those previously described.

23 is an AC power supply, 24 is a DC bias power supply, and a voltage Vp, which is a superimposition of an AC voltage from the AC power supply 23 and a DC voltage -vO having a polarity opposite to the charged polarity of the toner 22 from the DC bias power supply 24, is applied to the back electrode. 20. Note that FIG. 4 shows temporal changes in the voltage Vp. Reference numeral 25 denotes a power source that applies a voltage with a polarity opposite to that of the toner 22 to the back electrode 2o, and 26.27 represents a power source that applies voltages with opposite polarity to the control electrodes 17a and 17b, respectively.These power sources 26.27 and control electrode 1
A switching means 28 is inserted between 7a and 17b.

Next, the operation of this embodiment will be explained. In this embodiment as well, it is assumed that the toner 22 is positively charged.

First, let us consider the period during which the voltage Vp applied to the toner carrier electrode 15 has positive polarity. still,
As shown in FIG. 4, the DC voltage -VoO value is such that the minimum value VC- of the voltage Vp is less than a certain value -Vs, and the maximum value V(+) of the voltage Vp has positive polarity. It is assumed that the settings are as follows.

In this case, electrical repulsion acts between the toner carrier electrode 15 and the toner 22, and the toner 22 on the toner carrier electrode 16
The toner 22 separates from the electrode 15 (in FIG. 3, the toner 22 moves upward).

At this time, when a negative polarity electrode is applied from the power supply 26 to the control electrodes 17a, 17b via the switching means 28, an electrical attractive force acts between the toner 22 and the control electrodes 17a, 17b. A part of the toner 22 adheres to the control electrodes 17a, 171), and another part of the toner 22 passes through the toner passing gap 19 and reaches the recording medium 21, where it is affected by the electrical current acting between it and the back electrode 20. Due to gravity, the same medium 21
held on top. As a result, recording is performed.

Note that when the voltage Vp is at its maximum value in the positive polarity direction, that is, when Vp=V (+), the repulsive force acting between the toner 22 and the toner carrier electrode 15 is maximum. Therefore, assuming that the toner 22 adhering to the control electrodes 17a and 17b does not interfere with the toner 22 flying later, when Vp=V(+), the toner passing through one gap The amount of 22 is the maximum.

On the other hand, when a positive voltage is applied from the power supply 27 to the control electrodes 17a, 17b via the switching means 28, an electrical repulsive force acts between the toner 22 and the control electrodes 17a, 17b, and the toner 22 is pushed into the gap. It becomes impossible to pass 19. Therefore, no recording is made.

Next, consider the period during which the voltage Vp applied to the toner carrier electrode 15 has negative polarity. In this case, an electrical attractive force acts between the toner 22 and the toner carrier electrode 15. Therefore, regardless of the polarity of the voltage applied to the control electrodes 17a, 17b, the toner 22 is held on the toner carrier electrode 15 and cannot pass through the gap 19.

For this reason, no recording is performed.

3- Also, when the voltage Vp applied to the toner carrier electrode 16 has negative polarity in this way, the control electrode 17a,
Electric attraction also acts between the toner 22 attached to the toner 17b and the toner carrier electrode 16.

Therefore, by applying a positive voltage to the control electrodes 17a and 17b, the control electrodes 17a and 17b.

The toner 22 attached to the electrode 17b and the same electrode 17a.

If an electrical repulsion is exerted between the toner 17b and the toner 17b itself, the toner 22 separates from the electrodes 17a and 17b and returns to the toner carrier electrode 16.

Further, when a negative voltage is applied to the control electrodes 17a, 17b, the toner 22 attached to the control electrodes 17a, 17b and the electrodes 17a, 1, and the toner 22 and the toner carrier. Both between the electrode 16 and
Electrical attraction acts.

Therefore, in this case, due to the difference in the drawing force,
It is determined whether the toner 22 leaves the control electrodes 17a, 17b. Therefore, as the value of the voltage Vp applied to the toner carrier electrode 15 increases in the negative polarity 14, the control electrode 17a.

The amount of toner 22 adhering to 17b decreases,
When Vp becomes less than a certain value -Vs, control electrodes 17a, 1
The toner 22B attached to the toner 7b is completely removed.

As a result, in this recording apparatus, the control electrode 17a is activated every cycle of the AC voltage from the AC power supply 23.

Since the toner 22 is removed from the control electrodes 17b, it is possible to prevent the quality of the recorded image from deteriorating due to adhesion of the toner 22 to the control electrodes 1ya and 17b.

Note that the recorded image formed by the toner 22 on the recording medium 21 as described above is then subjected to a fixing process by an appropriate means.

Next, the electrical resistance of the toner used in the recording apparatus according to the present invention will be explained.

In the present invention, the toner 22 that has reached the recording medium 21 is
However, in order to prevent the toner 22 from falling off the recording medium 21 before the fixing process, an electrical attractive force must continue to act between the toner 22 that has reached the recording medium 21 and the recording medium 21 for a certain period of time. For this purpose, it is necessary for the toner 22 that has reached the recording medium 21 to continue retaining the electric charge for a certain period of time.

6 and 6 both show a state in which the toner 22 is held on the surface of the recording medium 210 by electrical attraction, but in FIG. 5, the recording medium 21 is insulating, In FIG. 6, the recording medium 21 is electrically conductive.

When the recording medium 21 is insulative, as in the case of FIG. Retained.

On the other hand, if the recording medium 21 is conductive as shown in FIG.
Negative charges enter the recording medium 21 from the back electrode 20 . At this time, if the resistance of the toner 22 is low, of course
The positive charges of the toner 22 are quickly neutralized by the negative charges that have entered. Therefore, the electrical attraction tends to disappear, and the toner 22 tends to fall off from the recording medium 21. Conversely, if the electrical resistance of the toner 22 is high, even if negative charges enter the recording medium 21, the toner 22 retains positive charges for a sufficient period of time.

From the above, when the recording medium 21 is a conductor such as metal, or when the resistance value changes by several orders of magnitude depending on temperature and humidity, such as paper, it is desirable that the electrical resistance of the toner 22 is high.
It is desirable to have a specific resistance of 100 or more (however, depending on the time required for the toner 22 to retain an electric charge, the resistance value may be less than the above resistance value). Furthermore, if the electrical resistance of the recording medium 21 is sufficiently high, the electrical resistance of the toner 22 may be low, and no problem will occur even if the electrical resistance is less than the above resistance value.

7 is a schematic side view of a recording device according to another embodiment of the present invention, FIG. 8 is a plan view of a toner passage control body in the same recording device, and FIG. 9 is a sectional view taken along the line IK-IK in FIG. 8. It is.

In FIG. 7, reference numeral 29 denotes a cylindrical toner carrier electrode made of a conductive material, and plates 17, . . Still, the toner carrier electrode 2
A roll-shaped magnet 31 is rotatably housed inside the magnet 9, and the magnet 31 is rotated by a drive device (not shown). Reference numeral 32 denotes a powder-like composite toner with high electrical resistance, which is a mixture of magnetic toner 32a and non-magnetic toner 32b. Here, the magnetic toner 32a
contains a magnetic material with a weight coefficient of 70%, and its resistivity is approximately 100%
It is m. Still, the non-magnetic toner 32b has a specific resistance of 1
It has a high resistance of 13Ωm or more. When the magnetic toner 32a and the non-magnetic toner 32b are mixed, the magnetic toner 32a is negatively charged and the non-magnetic toner 32b is positively charged.

33 is a rotatable cylindrical back electrode, and this back electrode 33 is rotated by a drive device (not shown). Further, the back electrode 33 faces the outer peripheral surface of the toner carrier electrode 29 via a toner passage gap 36 provided between a pair of toner passage control bodies 34a and 34b. Reference numeral 36a denotes a paper tube for passing ordinary 187.
The toner passage control bodies 34a and 34b are designed to pass below the flash fixing device 37 after moving along the outer circumferential surface of the toner passage control body 34a, 34b, as shown in FIGS. 8 and 9, respectively. The insulator 38 is made of a film of polyester resin, polyamide resin, etc., a glass plate, a ceramic plate, etc., and the insulator 3 is formed at a density of, for example, 8 pieces/- by a method such as photoetching.
2048 control electrodes 39 are formed on each side of B.
．． It consists of 40. Note that the control electrodes 39.40 of the toner passage control body 34a and the control electrodes 3-9.40 of the toner passage control body 34b are opposed to each other with a gap 36 in a one-to-one relationship. The pair of control electrodes 39 and the bare control electrodes 40 facing each other are
They are electrically connected to each other.

Returning to FIG. 7 again, 41 is an AC power supply, 42
is a DC bias power supply, and the AC power supply 41 generates a 1-s AC voltage (for example, a peak value of 1.2 KV).

frequency (approximately 500 Hz) and DC voltage Vo (for example, -200 to -400V) from the DC bias power supply 42.
The voltage Vp superimposed on the toner carrier electrode 29
is applied. Note that the waveform of the AC voltage may be a sine waveform, a rectangular waveform, a triangular waveform, or the like. 43 is a DC power supply that applies a negative voltage to the back electrode 33, and 44 is a control circuit that applies a control voltage to each control electrode 39, 40, respectively.

Next, the operation of this embodiment will be explained.

When the magnet 31 is rotated by the drive device, this magnet 3
Based on the rotating magnetic field caused by the rotation of 1, the toner 32 is
The carrier electrode 29 is transported on the outer circumferential surface thereof. At this time, the toner 32 is formed into a thin layer by the blade 30 on the outer peripheral surface of the toner carrier electrode 29.

In such a state, when the voltage Vp becomes positive, the positively charged non-magnetic toner 32b is attracted to the toner carrier due to the electric repulsion acting between the toner 32b and the toner carrier electrode 29. When the toner 32b separates from the electrode 29 and moves toward the gap 35, and conversely, the voltage Vp becomes negative, electric attraction acts between the toner 32b and the toner carrier electrode 29, so that the toner carrier electrode 29 (However, as will be described later, the toner 32 that has already passed through the gap 35 and adhered to the plain paper 36
b remains on the plain paper 36 to that extent). Therefore, depending on the alternation of the polarity of the AC voltage, the non-magnetic toner 32
b represents the toner carrier electrode 29 and the toner passage control bodies 34a, 3;
It goes back and forth between 4b and 4b.

Note that the negatively charged magnetic toner 32a is
When the magnet 31 is of positive polarity as well as when it is of negative polarity,
(This state can be realized by appropriately setting the magnetic force of the magnet 31 and the AC voltage and DC voltage Vo.) The power supply 43 applies a voltage of negative polarity (for example, -50 oV) to the back electrode 33, and the control circuit 44 applies a voltage of negative polarity ( For example, -300V) is applied, while the pair of control electrodes 4o corresponding to the pair of control electrodes 39 (the pair of control electrodes located on the back side of the pair of control electrodes 39) is set to O■, as described above. The positively charged non-magnetic toner 32b separated from the toner carrier electrode 29 by the voltage Vp passes through a portion of the gap 35 that is sandwiched between the pair of control electrodes 39 and the pair of control electrodes 40;
It is attracted to the back electrode 33 and held on the plain paper 36'' (in this embodiment, the voltage applied from the control circuit 44 to the control electrodes 39, 40 is synchronized with the AC voltage from the AC power source 41). ). Incidentally, the larger the absolute value of the negative voltage applied to the back electrode 33, the smaller, higher the density, and the sharper one pixel recorded on the plain paper 36 will be.

In contrast to the above, they are facing each other.
・ ・ When the pair of control electrodes 39 is set to ○V and a positive polarity electrode (for example, +300V) is applied to the pair of control electrodes 40 corresponding to the pair of control electrodes 39, the non-magnetic toner 32b is 35, the control electrodes 39, 4
This means that it does not pass through the part where it splits into a pair of 0's.

Therefore, by controlling the control voltages applied to each pair of control electrodes 39.degree. 4o in accordance with the image signal, an image corresponding to the image signal is recorded on the plain paper 36.

Then, the image formed by the toner 32b on the plain paper 36 is fixed by the flash fixing device 37, and a final recorded image is obtained.

In this embodiment as well, each time the voltage Vp becomes negative, electric attraction acts between the toner 32b attached to the control electrode 39, 40 and the toner carrier electrode 29, and the control electrode 39.
Toner 32b is removed from 9.40. therefore,
Deterioration in the quality of recorded images due to adhesion of toner 32b to control electrodes 39 and 40 can be prevented.

Note that the plain paper 36 used in the above examples had a specific resistance of about 10 QCrn, but instead of this plain paper 360, a polyethylene terephthalate sheet with a resistivity of about 10 QtM or more, which can be considered insulating, may also be used. However, it was still possible to record on the aluminum surface of an aluminum vapor-deposited notebook, which can be considered conductive. It was also possible to record on composite materials with a resistive layer and a dielectric layer, such as electrostatic recording paper. In this manner, this recording apparatus can perform recording on an extremely wide variety of recording media.

In the above embodiment, the toner carrier electrode 29 is fixed and the magnet 31 is rotated, but even if the toner carrier electrode 29 is rotated and the magnet 31 is fixed, The toner 32 can be conveyed along the outer peripheral surface of the toner carrier electrode 29 .

Further, in the above embodiment, the toner carrier electrode 29 is made of only a conductive material, but the outer peripheral surface of the toner carrier electrode 29 may be covered with a dielectric layer. This can prevent short-circuiting between the toner carrier electrode 29 and the blade 3o due to foreign matter or the like. However, in this case, it is necessary to increase the voltage Vp applied to the toner carrier electrode 29 by the voltage applied to the dielectric layer.

Alternatively, the outer peripheral surface of the toner carrier electrode 29 may be covered with a dielectric layer except for the portion facing the gap 35, and the portion facing the gap 36 may be made conductive. Further, the conductive portion may protrude toward the gap 35 to an extent that does not interfere with the conveyance of the toner 32.

In the above embodiment, a composite toner in which a magnetic toner 32a and a non-magnetic toner 32b were mixed was used as the toner 32, but a toner consisting only of magnetic toner and a toner consisting only of non-magnetic toner may also be used. good. In addition,
In the case of only magnetic toner, it is possible to transport it in the same manner as in the above embodiment. On the other hand, in the case of only non-magnetic toner, it is generally difficult to transport the toner, but it is possible to transport the toner by, for example, cutting a groove in the toner carrier electrode, placing the non-magnetic toner in the groove, and transporting the toner.

57 Just like the toner passage control body 34a of the above embodiment.

34b, control electrodes 39.34b are provided on both sides of the insulator 38.
40, it goes without saying that it is also possible to provide a control electrode only on one side of the insulator 38 and control the passage of toner only by that control electrode.

Further, FIG. 1o is a side view of a toner passage control body in another embodiment of the present invention. In this case, a control electrode 46 is provided on one surface of the insulator 45, and a control electrode 47 is provided on the other surface, and a control electrode 46 is provided every arbitrary number M (M≧2, M=3 in the figure). Divide into blocks,
One control electrode 47 is arranged to face each block of control electrodes 46 with an insulator 46 in between. This structure enables a divided control drive system similar to that used in multi-needle electrostatic recording heads in facsimile machines, printers, etc., and reduces the number of circuits that drive the control electrodes. can.

By the way, like the embodiments shown in FIGS. 3 and 7,
When applying an AC voltage to the toner carrier electrode, depending on the relationship between the period of the AC voltage and the timing of application of the control voltage to the control electrode, the toner that originally passes through the toner passage gap may be transferred to the toner carrier. There is a risk that it will be drawn back to the electrode, causing density unevenness in the image.

FIG. 11 is a schematic side view of a recording apparatus according to yet another embodiment of the present invention capable of preventing such inconveniences, and the same components as in the embodiment of FIG. 3 are designated by the same reference numerals. It is shown with. Further, 48 is a toner separation power source that applies a voltage of the same polarity (positive polarity) as that of the toner 22 to the toner carrier electrode 15, and 49 is a power source that applies a voltage of opposite polarity (negative polarity) to the charged polarity of the toner 22 to the toner carrier electrode 15. These power supplies 48 and 4
A switching means 50 is inserted between the toner carrier electrode 9 and the toner carrier electrode 16 .

In this embodiment, as shown in the timing diagrams of FIGS. 12, 13, or 14, during a period when no image signal is applied, a voltage having a polarity opposite to that of the toner 22 is applied to the switching means from the toner recovery power source 49. By applying power from the toner recovery power source 49 to the toner carrier electrode 15 via the switching means 50, the occurrence of density unevenness can be prevented.

That is, in FIG. 12, during the application period of the image signal shown in FIG.
8 to the toner carrier electrode 1 via the switching means 5o.
5, and at the end of each image signal application period,
As shown in FIG. 1C, a voltage having a polarity opposite to that of the toner 22 is applied from a toner recovery power source to the toner carrier electrode 15 via the switching means 50 (in addition, in FIGS. 12 to 14, , the high-level section in the column of the "power supply for toner withdrawal" port indicates the section in which the power supply for toner withdrawal 48 is connected to the toner carrier electrode 16 via the switching means 50, and the section of the "power supply for toner collection" port The high-level section in the column indicates the section where the toner recovery power source 49 is connected to the toner carrier electrode 16 via the switching means 50).

In addition, in FIG. 13, during the period when the line enable signal shown in A is on, a voltage is applied between the toner 22 and the toner carrier electrode 15 from the toner separation power source 48 as shown in the opening of the figure, while the line In the period in which the enable signal is off, a voltage having a polarity opposite to that of the toner 22 is applied from the toner recovery power source 49 to the toner carrier electrode 15, as shown in FIG.

Further, FIG. 14 shows that during the period when the page enable signal is on, as shown in FIG. As shown in FIG. 12C, a voltage with a polarity opposite to that of the toner 22 is applied from the toner recovery power source 49 to the toner carrier electrode 15 during the period when the page enable signal is off. Which of the methods shown in FIG. 14 and FIG. 14 should be used may be selected by considering the extent to which the recorded image is degraded by the adhesion of the toner 22 to the control electrodes 17a and 1yb.

Effects of the Invention As described above, according to the present invention, 29.'
−“The voltage with the opposite polarity to the charge polarity of the toner that should be flown is
By applying the toner to the toner carrier electrode at an appropriate timing, it is possible to remove the toner adhering to the control electrode from the control electrode, thereby achieving an excellent effect of preventing deterioration of the quality of the recorded image. be.

[Brief explanation of drawings]

FIG. 1 is a principle diagram of a recording device that is the premise of the present invention, FIG. 2 is a side view showing an example of a method of supplying toner to the surface of a toner carrier electrode in the present invention, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a waveform diagram showing temporal changes in the voltage applied to the toner carrier electrode in the embodiment, and FIG. 6 is a schematic side view of the recording device according to the embodiment. FIG. 6 is an explanatory diagram showing the state of toner retention in the case where the recording medium is conductive in the above embodiment. FIG. 7 is a schematic diagram of a recording apparatus according to another embodiment of the present invention. A side view, FIG. 8 is a plan view of the toner passage control body in the above embodiment, and FIG. 9 is a side view of the IK-
, [A cross-sectional view taken along the line 1°3o-2.] Fig. 11 is a side view of a toner passage control body in still another embodiment of the present invention, and Fig. 11 shows the application timing of still another control voltage of the present invention. FIG. 15, 29... Toner carrier electrode, 16.34
a. 34b...Toner passage control body, 17a, 17b
. 39.40.46.47... Control electrode, 19
, 35... Toner passage gap, 20. G3...
... Back electrode, 21.36 ... Recording medium (plain paper), 22 , 32 ... Toner, 23 to 27
．． 41-43, 48.49...Five power supplies, 44...
...Control circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Fig. 2 Fig. 3 'l-1-Niichi Tanuki Ling's greetings reference digits drawn by the prefecture Fig. 8 Fig. 9 Approximately Fig. 10 Fig. 11

Claims (1)

[Claims] a toner carrier electrode whose surface is supplied with charged powdered toner; a toner passage control body having a control electrode; a toner passage gap provided around the control electrode; a back electrode facing the toner carrier electrode; means for applying voltages of the same polarity and opposite polarity to the charged polarity of the l-toner to the toner carrier electrode for different periods; A recording device comprising: means for applying a polar voltage to the back electrode; and means for applying a control voltage to the control electrode; and a recording medium is supplied between the back electrode and the control electrode.