JPS60205549A - Image recording and display device - Google Patents

Abstract

PURPOSE:To decrease the relative movement of a recording medium and a recording electrode and the problem in spacing and to obtain a device which erases easily an image by providing a means for moving integrally a developing machine and a recording electrode back and forth relatively with a recording medium. CONSTITUTION:AC14 is impressed to the 1st electrode 8 of a recording electrode 2' to generate positive and negative ions. A recording signal 3 is impressed to the 2nd electrode 9 and a DC bias 16 is impressed to the 3rd electrode 10. Only the ion of the specific polarity is irradiated through an aperture 13 on a recording sheet. The conductive toner T on a developing sleeve 5 contg. a magnet 6 develops the ion image on the back of a recording sheet. All the 2nd electrode 9, the 3rd electrode 10 and the developing sleeve 5 are grounded and AC is impressed to the electrode 8 in the stage of erasing the image. The generated positive and negative ions ar irradiated through the aperture 13 to erase the previous ion image so that the recording sheet is maintained at the earth potential.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an image display device, particularly one side of a recording medium, which has conductivity on one side of a recording medium. The present invention relates to a device that applies toner to record and display images.

Conventionally, this type of image recording method is generally known as a chondrography method. This uses a high-resistance film as a recording medium, with recording electrodes arranged opposite to each other on the back side, and a developing device containing conductive magnetic toner on the surface. 0 This image 1#! is a device that applies a signal to deposit toner on the recording medium to create a visible image. Based on the recording method, an outline of a conventional image recording and display device will be explained with reference to FIG. In FIG. 1, reference numeral 1 denotes a recording medium, and on the back side of the recording medium, recording electrodes 2 formed by arranging a large number of needle electrodes are arranged oppositely with a small gap therebetween. A signal voltage corresponding to the image pattern is applied to each needle electrode of the recording electrode 2 independently of the character signal generation mode 3. On the other hand, there is a developing device 4 facing the front side of the recording electrode &2. The developing machine 4 has a conductive magnetic toner T, a hollow cylindrical sleeve 5 made of a non-magnetic conductor, and a stationary magnet 6 surrounded by the sleeve 5, and these are housed in a toner cartridge 7. .

The recording medium 1 moves in the direction of arrow A, and the character signal generator 3 applies a recording voltage to the recording electrode 2 according to the image pattern. As the toner T is rotated in the direction of arrow B, the toner T is conveyed over the sleeve 5 by the action of the magnet 60 and comes into contact with the surface of the recording medium 1.
is the opposite electrode of the recording electrode 2, and discharge occurs between the tip of the recording electrode 2 to which a recording voltage is applied and the recording medium 1,
At the same time that an electric charge is generated on the back surface of the recording medium 1, three f
An electric charge having a polarity opposite to that of the above electric charge is injected into the toner T from 5 through the toner T, and due to the attractive force between the electric charge on the toner and the electric charge on the back surface of the recording medium, the toner T shakes off the magnetic force of the magnet 6. The particles are deposited on the surface of the recording medium 1, and a visible image is obtained. Such an image recording/displaying device has a minute distance between the recording electrode 2 and the recording medium 1! J (several μm-several tens of μt
In order to solve this problem, there is a method of roughening the surface of the recording medium 1 as described in JP-A-57-105758.

By the way, in such an image recording/displaying device, the recording medium 1
Since the thickness of the film controls the resolution, it is usually set to
It must be as thin as a micron. However, supporting and moving such a film poses great difficulties. or,
Since the recording medium is not laminated with a conductive layer, it is difficult to erase the latent image uniformly, and it is difficult to apply a large force to erase the previous image by cleaning the thin recording medium. Have difficulty.

The purpose of the present invention is to eliminate the drawbacks of the above-mentioned conventional examples, reduce problems regarding relative movement and gap between the recording medium and the recording electrode, and
An object of the present invention is to provide a permanent image recording/displaying device in which images can be easily erased. The image recording/displaying device of the present invention has a recording medium such as an insulating or high-resistance thin film, and a conductive magnetic toner, which is magnetically applied to the recording medium. a developing device facing the surface of the recording medium, which is brought into contact with the surface of the recording medium; a recording electrode facing the back surface of the recording medium, which generates a potential gradient that causes charged particles having a polarity opposite to those described above to move to the back surface of the recording medium when erasing an image; and a developing device. and means for integrally reciprocating the recording electrode relative to the recording medium.

FIG. 2 (-) is a principle diagram of the image recording and display apparatus according to the present invention, and in the figure, the same parts as in FIG. 1 are designated by the same reference numerals. The recording electrode is generally designated by the symbol 2' and consists of an M1 electrode 8, a second electrode 9, a third electrode 10, a first dielectric 11 and a second dielectric 12 that insulate these from each other. C,
It extends in a direction perpendicular to the moving direction of the recording medium 1 (width direction). The second electrode 9, the second dielectric 12, and the third electrode 10 are penetrated by a large number of openings 13 arranged in the width direction. Second
The number of electrodes 9 equal to the number of openings 13 forms a group of mutually independent and insulated electrodes as shown in FIG. 2(b), and a signal voltage is applied independently from the character signal generator 3. The recording electrode 21 described above passes through the aperture 13 into the sleeve 5. Recording medium
is movable relative to the recording electrode 2' and the developing device 4.

When a current voltage is applied between the first electrode 8 and the second electrode 9 from the AC power source 14, corona discharge occurs between the first dielectric body 11 and the second electrode 9, and positive ions are generated inside the aperture 13. , negative ions are generated. At this time, the character signal generator 3, the DC power supply 16, the second electrode 9, the third electrode 10, and the sleeve 5 are connected so that one of the ions goes toward the recording medium 1.
If a potential gradient is applied between the tabs, an image signal voltage is applied between the second iE electrode 9 and the sleeve 5, and a constant DC voltage is applied between the third electrode 10 and the sleeve 5, the recording medium 1
Ions adhere to the surface. These processes are described in Japanese Patent Application Laid-Open No. 54-78
134. At the same time, charges with the opposite polarity to the charged particles (ions) attached to the back surface of the recording medium 1 miss the three f5 and are applied to the toner T that is in contact with the surface of the recording medium 1, causing toner to be deposited on the surface of the recording medium 1. Attachment produces a visible image. The explanation regarding this point is the same as that in FIG. 1. Conversely, when removing (i.e., erasing) the adhered toner T from the recording medium, the charge on the back surface of the recording medium 1 is extinguished (i.e., the charge is eliminated). There is a need. It is necessary to perform this static elimination while grounding the surface of the recording medium, but in the apparatus shown in FIG. Grounding occurs automatically and toner adhering to the surface is also removed.

For example, if the second electrode 9, third electrode 10, and sleeve 5 are grounded, static electricity can be eliminated and the image erased.◎However, a static elimination device separate from the recording electrode 2' may be used, and in this case, when erasing the image, It is preferable to switch the positions of the recording electrode 2 and the static eliminator only.

When eliminating static electricity using the recording electrode 2', the second electrode 9,
If the 311i-th pole 10 and the sleeve 5 are made to have the same potential,
Among the glass ions or negative ions present in the apertures 13, ions having a polarity opposite to the polarity of the charge on the back surface of the recording medium 1 are attracted to the charge and removed from the back surface of the recording medium 1, and at the same time, the ions are removed from the back surface of the recording medium 1. The charge held by the toner on the surface is also returned to the sleeve, and the adhesion force between the recording medium 1 and the toner T disappears, so the toner T is attracted to the magnet 6 and collected.

The basic structure and operation of the present invention have been explained above, and next, an embodiment of the present invention is shown in FIG.

In FIG. 3, the vertical relationship between the recording electrode 2' and the developing device 4 is reversed compared to FIG. ' and development @4
) is designed to move. That is, the recording medium 1 is stretched on a frame 18 (FIG. 4 is a perspective view thereof), and the recording means such as the recording electrode 2f and the developing device 4 are attached to a single screw 19. As shown in Figure 3, it is supported so that it can move left and right. Recording electrode 21 and developer 4
are integrally connected to the outside of the image recording medium 1, and the developing device 4 is further equipped with a motor for rotating the magnet 6 inside. 21 is a display window glass. The structure and operation of the MC recording means consisting of the recording electrode 2/ and the developing device 4 are the same as those explained in FIG. The recording means is driven in the left-right direction in FIG. 3 with respect to the recording medium IVc by rotating the screw 19 with the motor 20, and forms a toner image on the image recording medium 1 as described above when moving to the left. . After forming the toner image, the recording means stops at the left end position outside the display window glass 21, and the image is displayed through the window glass 21.

After the light display ends, the recording means is moved to the right, and at this time, the image is erased as described above, in preparation for recording the next image.

As the recording medium 1, it is desirable to use a dielectric film such as /17 ester, polyethylene, polyvinyl chloride, etc., which has a resistance value of 1010 Ω or more and has a strong tensile strength. The thickness may be 1 μm to 100 μm, but it is desirable to make it thinner to increase the resolution and thicker to increase the tensile strength.Also, when the recording medium is white for reflective display. For this purpose, a white pigment may be kneaded in before film formation, or a mixture of white pigment and pine goo resin may be applied to the surface. In this example, a 18-micron-thick 4-lyl resin was used, and a paint containing titanium oxide dispersed therein was applied to a thickness of about 3 microns.

The thickness of the first electric body 11 is related to the output voltage of the AC power source 14, and the thinner the thickness, the lower the applied voltage.
A polyimide film with a thickness of m was used. The first electrode 8, the second electrode 9, and the third electrode 10 each use a stainless steel foil with a thickness of 20 μm, and the second dielectric 12 has a thickness of 10011 m in the prototype, although it is related to the diameter of the opening 13. The diameter of the opening 13 was 130°. The apertures 13 are usually arranged in a line perpendicular to the direction of movement of the recording medium 1, and the second electrode 9 can independently control the voltage as many as the number of apertures 13. However, in order to increase the recording density, normally, the apertures 13 are staggered or arranged diagonally in several rows, the first electrode 8 is divided and extends in the direction of the recording medium, and the divided first electrodes 8 It is also possible to form intersections of a matrix of combinations of the second electric current 9 and the second electric current 9, and drive the electric current separately. Third electrode 10 and #24shk I* 1 tn TE m-shina n 9 . 1rr I-4- The sleeve 5 facing the recording electrode 2 was made of stainless steel and had a diameter of 22+a+, and the internal magnet 6 had four poles magnetized evenly and the magnetic flux density on the sleeve surface was 460ffx. . magnet 6
is rotated by a motor (not shown) at 1500 revolutions per minute. The gap between recording medium 1 and sleeve is 0.5 txm
A non-magnetic doctor blade 15 is attached to the toner hole/f-7 as shown in FIG.

The toner T may be any conductive magnetic powder toner having a resistance value of 1010 Ω·α or less, but in reality, 3M Co.'s 355 Image Dano Clouder was used.

With the above-mentioned configuration, the recording electrode 2' and the developing device 5 are moved to the left in FIG. 3 relative to the recording medium 1 at a speed of 18o1 per second for recording, and the frequency is 500 kHz.
An AC voltage of 2.5 vP'p is applied from the AC power supply 14 to between the first electrode 8 and the second electrode 9, and the second electrode 9 is supplied with an AC voltage of -700 V from the character signal generator 3 when there is an image signal. % When there is no image signal, a voltage of -400V is applied. A DC power source 6 applies a voltage of 600 V to the third electrode 1o during lightning.

In this state, when a recording signal corresponding to the image pattern is applied to the character signal generator 3 as described in FIG. 2, negative ions adhere to the recording medium 1. At this time, a glass charge is injected into the toner T on the opposite side from the surface of the sleeve 5, and the recording medium 1
The negative ions attached to the toner T attract each other, and the toner T adheres to the recording medium l. When there is no recording signal, the second electrode 9 is kept at -300, and a reverse electric field that does not allow ions to pass through the second electrode 9 and the third electrode 1o inside the aperture 13 acts, so ions do not enter the recording medium 1. does not adhere, and therefore toner T does not adhere. When this is done continuously, a visible image of the toner appears on the recording medium 1.

On the other hand, when removing (erasing) the toner T attached to the recording medium 1, the recording means is moved in the opposite direction (to the right in FIG. 3) to the above-mentioned relative movement, and the first electrode 8
By applying an AC voltage from the AC power supply 14 to the second electrode 9 and grounding the electrode 9, the third electrode 10, and the sleeve 5, an AC corona is generated between the first electrode 8 and the second electrode 9. The ions obtained by the discharge attract ions of opposite polarity due to the charge attached to the recording medium 1. In this embodiment, since the recording medium 1 is negatively charged, the glass ions are attracted to it, and these cancel each other out, so that the electric charge on the recording medium 1 disappears. At the same time, the charge that had been injected into the toner T flows into the sleeve 5, so that the adhesion force between the recording medium 1 and the toner 7 is lost. This toner T is collected by the magnetic force generated by the magnet 6 in the nahotonog-7.

In the above explanation, the second electrode 9 and the third electrode 10 are grounded during erasing, but the second electrode is connected to the AC power source 14.
An alternating current voltage with the same phase as that may be applied. However, in this case, it is better to increase the voltage of the current power supply 14.

The visible image obtained on the recording medium is not shown in the figure, but pressure transfer, heat transfer, corona transfer, etc. are used, and if the body surface is transparent, it can be fixed by heating or irradiated with light without being fixed. If it is configured as such, it can be used as a projection display with the function of an overhead floatoctor as it is. Further, as the image forming means on the recording medium, the method described in FIG. 2 is suitable, but the method described in FIG. 1 and other ion flow modulation methods can also be applied in principle.

As described above, according to the present invention, since the recording medium is stretched and fixed, even if a thin film is used as the recording medium, misalignment, wrinkles, etc. can be prevented, and the recording medium and the recording Since it is not particularly necessary to maintain and expand an extremely small gap between the two, stable image recording and display is possible.

Also, since the image can be erased when the recording means returns, it has the advantage of being a device with a very simple configuration.

[Brief explanation of drawings]

1 is a schematic diagram of a conventional example of an image forming display device, FIG. 3 is a schematic diagram of an embodiment of the present invention, and FIG. 4 is a perspective view of a recording medium and a frame in FIG. 3. 1... Image recording medium 2.21... Recording electrode 3...
・Character signal generator 4...Developing machine 14...AC power supply 15...DC power supply Figure 1, possible

Claims (1)

[Claims] A recording medium stretched with an insulating or high-resistance thin film, and facing the surface of the recording medium that holds a 4-electromagnetic toner and brings it into contact with the surface of the recording medium by magnetic force. A developing device that generates positive and negative charged particles and generates a potential gradient that moves unipolar charged particles among these charged particles to the back side of the recording medium when an image recording signal is applied, and when erasing an image, the above is different from the above. A recording electrode facing the rear surface of the recording medium that generates a potential gradient that moves charged particles of opposite polarity to the rear surface of the recording medium, and the developer and the recording electrode are integrally moved back and forth relative to the recording medium. An image recording and display device comprising: means.