JPS6032185B2 - recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the field of electronic recording in which a visible image is formed by applying an image signal voltage. p
This relates to a recording device that performs recording on (linepaper).

Conventionally, an example of this type of device is Mochiseki 50-31827.
There is something mentioned in the publication.

This will be briefly explained with reference to FIG. 1 is a recording body, 2 is a recording electrode which is a first electrode, 3 is a magnetic brush, and 4 is a conductive magnetic toner (hereinafter simply referred to as "toner").

The toner 4 is an electrical conductor and has the property of being magnetically attracted. Reference numeral 5 denotes a fixed magnetic roller, and a conductive sleeve 6, which is a second pole, is provided on the outside of the fixed magnetic roller so as to rotate in the direction of arrow A.

7 is an image signal voltage applied between the recording electrode 2 and ground.

8 is a visible image formed by the toner 4.

9 indicates a recording area.

To explain its operation, a recording area 9 is formed between the recording electrode 2 and the sleeve 6 which are arranged close to each other, and the toner 4 is transferred to the recording area 9 by the sleeve 6 rotating around the fixed magnetic roller 5. Supplied.

The recording medium 1 is sent in the direction of arrow B while being in contact with the recording electrode 2, and the other surface that is in contact with the recording electrode 2 comes into contact with the toner layer 4'. By applying the image signal voltage 7 to the recording electrode 2, the electrostatic attraction force to the recording medium 1 due to the charged charges is caused by the force of the magnetic roller 5 toward the sleeve 6, which is the second electrode, from the recording medium 1. When the force is greater than the force trying to remove the toner 4, the toner 4 selectively adheres to the recording medium 1 and a visible image 8 is formed. By the way, the aforementioned Tokuseki Showa 5
0-131827 describes an embodiment in which a row of pins made of copper wire is used as the recording electrode 2.

Such a multi-wire multi-needle electrode is usually formed as shown in FIG. In FIG. 2, a large number of electrode elements 2A are arranged to form a group of electrodes. Each electrode element 2A is insulated from each other and embedded in resin 2B, and a lead wire (not shown) comes out from a surface 2D opposite to the surface 2C that contacts the recording medium, and each electrode element 2A is sequentially switched. be done. Each electrode element 2A is exposed on the surface 2C and comes into contact with the recording medium 1, as shown in FIG. However, in this case, since the contact area between the surface 2C and the recording medium 1 is large, each electrode element 2A located at the center of the surface 2C
An air gap is generated between the recording medium 1 and the recording medium 1, which tends to cause poor contact. For this reason, the adhesion of the toner 4 becomes weak, resulting in a low recording density or requiring a high recording voltage. Furthermore, although a pulse voltage is usually applied as the image signal voltage 7 in FIG.
' is in contact with .

Therefore, the electrical charge of the toner 4 is discharged again through the toner layer 4', reducing the adhesion force. Therefore, it is desirable that the contact time with the toner layer 4' after voltage application be as short as possible. Furthermore, in order to retain the charge charged on the toner 4 for a long time, it is desirable that the resistance of the toner layer 4' is high. It needs to be longer, which slows down the recording speed. Therefore, it is sufficient that the resistance of the toner layer 4' is low at the time of applying the pulse voltage, and becomes high after the recording electrode 2 returns to the ground potential after the application. This invention was made to solve these problems.

This invention will be explained below. FIG. 3 shows an embodiment of the present invention, in which 20 is a recording head, and a multi-needle electrode 22 is formed on the surface of an insulating support plate 21. In FIG. The multi-needle electrode 22 is produced, for example, by printed wiring.
That is, multi-needle electrodes 22 are mounted on the surface of a printed circuit board that is made by impregnating paper or cloth with highly insulating resin such as phenol resin or epoxy resin and laminating it to a thickness of about 1 to 2 ribs.
is formed flat by printed wiring such as photoetching. The magnetic brush 3 rotates the sleeve 6 in the direction of the arrow A to supply the toner 4 to the recording area 9 in the same way as in the secondary example of FIG. Its operation will be explained. In the recording area 9, there are a recording head 20, a recording medium 1, a toner layer 4', and a sleeve 6.
They are arranged in the following order. In the recording area 9, the gap is limited by the recording head 20 and the sleeve 6, so the toner layer 4' moves forward while being attracted to the fixed magnetic roller 5 compared to that in the free area at point C, for example. , it will be somewhat compressed in the gap. Further, after the recording medium 1 passes through the recording head 20, its feeding direction is changed in a direction away from the toner layer 4'. Therefore, after the recording medium 1 has passed the recording head 20, that is, in the release area as shown by point D, the toner layer 4'
restrictions are rapidly solved. FIG. 4 shows an enlarged view of the recording area 9 to make it easier to understand. Fourth
In the figure, in the restricted area 31, the passage width of the toner layer 4' is restricted as described above, so that the resistance value of the toner layer 4' becomes small.

Further, in the release area 32, as the recording medium 1 is fed, the gap between the sleeve 6 and the surface of the recording medium 1 increases, so that the restriction of the toner layer 4' is released.
The tip 33 of the multi-needle electrode 22 is located at the boundary between the release area 32 and the release area 32 . When the image signal voltage 7 (FIG. 3) is applied while sequentially switching the multi-needle electrode 22, the toner 4 at a position 34 facing the multi-needle electrode 22 across the recording medium 1 is charged with a polarity opposite to that of the applied voltage. It is injected from the side of 6 and is charged. On the other hand, since the multi-needle electrode 22 is in contact with the recording medium 1 at its tip 33, it is charged with a charge 35 having the same polarity as the applied voltage. In this case it is advantageous that the toner layer 4' is limited. That is, since the resistance is low, the toner 4 can be charged with a relatively low applied voltage or with a short application time, and therefore high-speed recording is possible with a relatively low voltage. The charged toner particles are attracted to the recording medium 1 by an electrostatic attraction force with the charges 35 charged on the opposite surface of the recording medium 1, and move along with the recording medium.

In this case, in order to maintain the electrostatic attractive force, it is desirable to maintain the charge on the toner 4 for as long as possible, as described above. Therefore, in this process, the toner layer 4
It is convenient that ′ is freed from restrictions. That is, since the resistance of the toner layer 4' increases as it is freed from the restriction, the charged charges 35 are attenuated and the adhesion becomes stronger, resulting in a higher recording density. Furthermore, since the toner layer 4' is free from restrictions, the contact pressure between the toner layer 4' and the recording medium 1 is small, and the toner 4 that has once been charged and adhered is less likely to be mechanically scraped off. The recording head 20 may be perpendicular to the surface of the sleeve 6, but a higher density contrast can be obtained by slanting the surface of the multi-needle electrode 22 toward the recording medium 1 as shown in FIG. Ta.

The reason for this is that the tip 33 of the multi-needle electrode 22 is tilted.
This is thought to be due to the improved contact between the recording body 1 and the electrode position at the end of the restricted area 31, in other words, the restriction is maximized at the boundary with the open area 32, and the aforementioned resistance reduction effect is greatly manifested. The above-mentioned effects of the present invention become more remarkable by selecting the direction of the magnetic field in the recording area.

The magnetic field generated by the fixed magnetic roller 5 where the magnetic brush stands up is highest at a position perpendicular to the sleeve surface.

Therefore, since the density of the toner layer 4' is sparse at this position, the effects of restriction and release can be easily obtained. FIG. 5 shows an exaggerated view of Tona Ichiyori 4 all standing.

FIG. 5a shows that when the recording head 20 is located in front of the position where the magnetic field perpendicular to the sleeve 6 is at its maximum (on the side closer to the feeding direction of the recording medium 1, that is, on the A side), FIG. This is the case when it is located at the rear (i.e., on the oral side). As is clear from the figure, better recording can be obtained in the case of FIG. 5a because the recording medium 1 separates from the toner layer 4' earlier. Example 1 Using toner 4 with a resistance value of 5 x 1 and Q/arc, d in Figure 3
When ,=also=0.2 ribs, plain paper was used as the recording medium 1, and a voltage of -600V was applied for 5 seconds while running it in the horizontal direction, but no visible image was obtained. .

However, when the plain paper was run so as to be separated from the toner layer 4' after voltage was applied as shown in FIG.
A clear visible image was obtained. Example 2 Using the same toner 4 as in Example 1, we compared the difference in recording due to the magnetic pole position, and found that the position of the multi-needle electrode 22 was at a peripheral angle of the sleeve 6 from the highest point of the spikes. When the recording medium 1 (plain paper) was shifted by 5o in the traveling direction, the recording density was highest, 0.6, but when it was shifted by the same angle in the opposite direction, the recording density was 0.35.

Note that in the above embodiment, a toner having conductivity and magnetism is used as the toner 4, and a magnetic brush 3 is used.
It does not necessarily have to be configured like this.

An example is shown in FIG. That is, in FIG. 6, a conductive restriction plate 11 is provided on one side of the toner container 10, and the lower end of the restriction plate 11 is a slope 12, and as the toner 4 flows out, it is gradually restricted by this slope 12. Ru.
A recording head 20 is provided opposite the restriction plate 11, and the recording medium 1 is sent between the two. 13 is an ultrasonic vibrator for shaking off unnecessary toner 4.

In such a configuration, it is sufficient that the toner 4 is conductive, and a magnetic brush is not required. In addition, the recording head 20 shown in FIG. 3 has a multi-needle electrode 22 integrally formed on the surface of an insulating support plate 21 to function as both an electrode and a restriction plate. A board may be placed in front of it. Furthermore, in the embodiment of FIG. 3, the multi-needle voltage 22
Although the feeding direction of the recording medium 1 is changed immediately after passing the point, the point at which the feeding direction changes may be a little further away from the multi-needle electrode 22, but the shorter the distance between the two, the higher the density will be recorded. can. Further, as the recording medium 1, in addition to plastic sheets such as mylar film, plain paper with a low degree of processing can be used.

Further, in the claims, the means for removing toner from the second side of the recording medium is a fixed magnetic roller 5 in FIGS. 3, 4 and 5, and an ultrasonic vibrator 13 in FIG. Corresponds to this.

As explained above, in this invention, the image signal voltage is applied at the boundary between the restricted area and the open area of the toner layer, so when the toner is charged, the toner layer has low resistance and is easily charged. After that, the resistance becomes higher and the charged charge is discharged (harder), and the charged toner is less likely to come into contact with the toner layer and be mechanically scraped off.
Therefore, it has the advantage of being able to record at high speed and with high density.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram showing an example of a conventional recording device, FIG. 2 is a perspective view showing the structure of a multi-needle electrode using multi-wires, and FIG. 3 is a configuration diagram showing an embodiment of the present invention. 4 is an enlarged view of the actual part of the embodiment shown in FIG. 3, FIGS. FIG. 3 is a schematic configuration diagram showing another embodiment of the present invention.

In the figure, 1 is a recording medium, 3 is a magnetic brush, 4 is a toner, and 4'
is a toner layer, 5 is a fixed magnetic roller, 6 is a sleeve, 7 is an image signal voltage, 8 is a visible image, 9 is a recording area, 2 rivers are a recording head, 21 is an insulating support plate, 22 is a multi-needle electrode, 31 is a restricted area, and 32 is a free area.

Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. A means for forming a recording area by arranging first and second electrodes facing each other and spaced apart from each other, and a means for causing a recording medium to pass through the recording area so that a first surface thereof is connected to the first electrode. means for causing the recording medium to travel while being in contact with the recording medium; means for supplying conductive toner between the second surface of the recording medium and the second electrode to form a toner layer; means for removing the toner, and by applying an image signal voltage between the first electrode and the second electrode, the toner is selectively attached to the second surface of the recording medium and visible. In the recording device for forming an image, the gap between the second surface of the recording body and the second electrode is smaller in the vicinity of the first electrode, and the thickness of the toner layer is controlled. , further comprising means for changing the feeding direction of the recording medium so that the distance between the second surface of the recording medium and the surface of the toner layer increases after the recording medium passes the first electrode. recording device. 2. The recording device according to claim 1, wherein the first electrode is a multi-needle electrode formed by printed wiring. 3. The recording device according to claim 1, wherein magnetic toner is used as the conductive toner, and a magnetic brush is used as means for forming the toner layer. 4 The first electrode is located at a position where the magnetic brush surface perpendicular magnetic field behind the first electrode with respect to the feeding direction of the recording medium is larger than the magnetic brush surface perpendicular magnetic field in front of the first electrode. Claim 3 which is arranged
Recording device as described in section.