JPS63137274A - Picture display device - Google Patents

Abstract

PURPOSE:To prevent the powdery image formed on a recording member from being scattered toward the picture display part by providing a sheet-shaped transparent conductive member, which is connected to the same potential as the conductive layer of the recording member, between the picture display part and the image forming face of the recording member. CONSTITUTION:A transparent conductive sheet 61 is arranged between a display window 49 and a recording belt 27 in a picture display part 25. The sheet 61 is connected to the same earth potential as the conductive layer of the belt 27. Thus, the toner image formed on the surface of the belt 27 is prevented from being scattered toward the inside of the display window 49 by static electricity caused in the display window 49. Even if the toner image is scattered, the display window 49 is not dirtied because a conductive toner 35 is stuck to the surface of the sheet 61.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an image display device using a magnetic stylus recording method, and is used for displaying, for example, computer output information, magnetic tape devices, and optical disks. The present invention relates to an image display device that reproduces and displays stored information stored in a device or a microfilm device as a visible image.

(Prior art) Conventionally, CRT displays, LCDs (liquid crystal displays), FDPs (plasma display panels), E
Various image display devices such as LDs (electroluminescent displays) have been developed and put into practical use.

Recently, compared to these image display devices, the structure is m*,
The development of image display devices using the magnetic stylus recording method disclosed in, for example, Japanese Unexamined Patent Publication No. 59-3462, which is capable of displaying high-quality images, is being developed and put into practical use. .

The magnetic stylus recording method is one of the electrostatic recording methods, and the basic principle of the magnetic stylus recording method will be explained in detail below with reference to FIG. In FIG. 4, 1 is an image conveyance section, 2 is a toner supply section, and 3 is an image recording section. The image conveyance unit 1 includes an electrically conductive drum 4 that is rotationally driven in the right direction in the figure, and an insulating recording sheet 5 formed on the outer peripheral surface of the drum 4. The drum 4 is connected to ground potential.

The toner supply unit 2 includes a conductive sleeve roll 6 which is disposed close to the drum 4 at a predetermined position and rotated in the right direction in the figure, and a conductive sleeve roll 6 which is disposed on the inner circumferential side of the sleeve roll 6 and has a surface area. It consists of a magnet roll 7 which is polarized in multiple directions in the circumferential direction and is rotationally driven in the left direction in the drawing, and a toner hopper 9 which is arranged close to the sleeve roll 6 and accommodates conductive magnetic toner 8 . A developing bias voltage is applied to the sleeve roll 6 from a DC power supply 10. The toner hopper 9 has an opening toward the sleeve roll 6, and can always supply the conductive magnetic toner 8.

The image recording unit 3 includes a recording head 11 arranged near the drum 4 with a predetermined gap from the sleeve roll 6, and a recording head 11 fixed on the recording head 11 so that its tip is close to the drum 4. A stylus electrode 12 consisting of a large number of needle-shaped electrodes each having a recording area of .mu.m width is arranged in the axial direction of the drum 4, and the stylus electrode 12 is arranged facing each other with a predetermined gap on both sides of the stylus electrode 12, and is driven to rotate. It consists of two sleeve rolls 13.14 and fixed magnets 15.16 arranged on the inner peripheral side of each sleeve roll 13.14 so that the same poles face each other.

Each needle-like electrode of the stylus electrode 12 is made of, for example, Fe-N
It is made of conductive ferromagnetic material such as i or Fe-Go. Moreover, each needle-like electrode of the stylus electrode 12 is
They are connected to an electrode drive circuit (not shown), and when these needle electrodes are turned on, a signal voltage having the same value as the developing bias voltage is applied, and when they are turned off, they are connected to the ground potential.

In such a configuration, when the magnet roll 7 is rotationally driven to the left in the figure and the sleeve roll 6 is rotationally driven to the right in the figure, the conductive magnetic toner 8 in the toner hopper 9 is rotated.
adheres to the surface of the sleeve roll 6 and is conveyed in the rotating direction of the sleeve roll 6 surface while spreading uniformly. At this time, since a developing bias voltage is applied to the sleeve roll 6, the conductive magnetic toner 8 attached to the surface of the sleeve roll 6 is positively charged.

When this positively charged conductive magnetic toner 8 on the surface of the sleeve roll 6 is conveyed to a position close to the drum 4, since the drum 4 is connected to the ground potential, the surface of the opposing drum 4 is is charged with a negative charge corresponding to the positive charge of the sN magnetic toner 8. As a result, the conductive magnetic toner 8 on the surface of the sleeve roll 6 is uniformly adhered to the surface of the recording sheet 5 formed on the drum 4 which is rotationally driven in the right direction in the figure, and is transported by the recording sheet 5. It will be done.

On the other hand, in the image recording section 3, the magnetic field generated by the fixed magnets 15 and 16 greatly magnetizes the stylus electrode 12 in the direction toward the recording sheet 5. As a result, a large magnetic field directed toward the recording sheet 5 is generated in the recording area at the tip of the stylus electrode 12. Therefore, the conductive magnetic toner 8 conveyed to the recording area by the recording sheet 5 is strongly influenced by this magnetic field and is strongly attracted toward the recording head 11.
As shown in FIG. 5, the recording sheet 5 and the stylus electrode 1
A chain 8a of conductive magnetic toner 8 is formed in the recording area between 2 and 2. As a result, a conductive path by the conductive magnetic toner 8 is formed in the recording area. When the needle-shaped electrode of the stylus electrode 12 is turned on while maintaining this state, a voltage is applied to the needle-shaped electrode in this part, so that the conductive magnetic toner 8
A positive charge is injected into the drum 4, and at the same time, an opposite negative charge is induced in the drum 4, and an electric field is generated within the recording sheet 5. The conductive magnetic toner 8 is drawn toward the recording sheet 5 by the force of this electric field and remains on the surface of the recording sheet 5. On the other hand, when the needle-shaped electrode of the stylus electrode 12 is turned off, the needle-shaped electrode is connected to the ground potential at this portion, so that the conductive magnetic toner 8 loses its charge. As a result,
The conductive magnetic toner 8 that has lost its charge is moved to the fixed magnet 1'5.
16, the stylus electrode 111 is drawn away from the surface of the recording sheet 5.
Move to 11. That is, a desired toner image (powder image) is formed on the surface of the recording sheet 5 by selectively controlling each needle electrode of the stylus electrode 12 on and off according to the image information to be recorded. be.

The conductive magnetic toner 8 that has moved toward the stylus electrode 11 is transferred to the sleeve roll 13 by the magnetic force of the fixed magnets 15 and 16.
．． It adheres to the surface of 14. The sleeve rolls 13 and 14 are driven to rotate, and the conductive magnetic toner 8 adhering to the surface thereof is scraped off by a toner scraping member (not shown) and stored in a toner collection container (not shown) for reuse.

FIG. 6 shows an example of a conventional image display device using the above-described magnetic stylus recording method. This image display device includes an apparatus main body 19, an image transport section 20, a toner supply section 21, an image recording section 22, a background cleaning section 23, and an all cleaning section 24.
, an image display section 25, and a toner transport section 26. The image display section 25 is arranged on the front side of the main body 19, and the toner supply section 21, image recording section 22, background cleaning section 23, and all cleaning section 24 are arranged on the back side of the main body 19 from the top to the all cleaning section 24. , toner supply section 21, image recording section 2
2. The background cleaning sections 23 are arranged vertically along the image conveying section 20 in this order.

The image conveyance section 20 includes a sheet-shaped recording member, for example, an endless sheet-shaped recording belt 27 with a white surface, which is placed around a drive roller 28 and idle rollers 29, 30, and 31 under tension. The recording belt 27 is moved, for example, in the direction of the oral arrow by the drive row 528 being rotationally driven by a motor (not shown). The recording belt 27 is made by coating a conductive layer on a flexible plastic film containing a white pigment, and further laminating an insulating layer made of polyethylene or polyester, which has high insulating properties and has a charge retention ability, on top of the conductive layer. , whose conductive layer is connected to ground potential. That is, the recording belt 27 has the same function as the drum 4 and recording sheet 5 in FIG. 4.

The toner supply section 21 has the same configuration as the toner supply section 2 in FIG. 4, and includes a DC power supply 32, a sleeve roll 33,
and a magnet roll 34, and these sleeve roll 33t3 and magnet roll 34 are provided in a toner collection container 36 in which conductive magnetic toner 35 is accommodated.

The self-other recording section 22 also has the same configuration as the image recording section 3 in FIG.
8, sleeve rolls 39, 40, and fixed magnets 41.
Consists of 42. The idle roller 29 is arranged at a position corresponding to the tip of the recording head 37, and the recording belt 27 is arranged so that a predetermined gap is formed between the surface of the recording belt 27 and the tip of the recording head 37. I support it.

The background cleaning section 23 cleans the recording belt 27.
A fixed sleeve roll 43 disposed close to the sleeve roll 43, and a magnet rotatably driven to the left in the figure, disposed on the inner peripheral side of the sleeve roll 43 and having a surface polarized to multiple polarities in the circumferential direction. A toner collection container 45 disposed below the roll 44 and containing the conductive magnetic toner 35
It consists of. The toner collection container 45 also accommodates the conductive magnetic toner 35 scraped off from the sleeve rolls 39 and 40 in the image recording section 22.

The all-cleaning section 24 is arranged close to the recording belt 27 and has a sleeve roll 46 that is rotationally driven in the right direction in the figure, and is arranged on the inner peripheral side of this sleeve roll 46, and the polarity of the surface is arranged in the circumferential direction. The magnetic roller 47 includes a multipolarized magnet roll 47 that is rotationally driven in the left direction in the figure, and these are provided in a toner collection container 48 that accommodates the conductive magnetic toner 35. Note that the sleeve roll 46 is connected to ground potential.

The image display section 25 has a transparent display window (such as transparent glass) so that the surface of the recording belt 27 on which the toner image is formed by the both-side recording section 22 can be viewed from the outside using reflected light.
49 are arranged.

The toner transport section 26 is connected to the background cleaning section 2.
3 and the toner collection container 4 of the all cleaning section 24
5. Toner accumulation section 50.51 provided at one end within 48
spiral rolls 52 and 53 that are rotatably driven to collect the conductive magnetic toner 35, and the toner supply section 21.
A spiral roll is provided in the toner collecting section 54 provided at one end of the toner collection container 36 and is rotationally driven to convey the conductive magnetic toner 35 along the axial direction of the sleeve roll 33 and uniformly supply it thereto. 55 and the toner supply section 21 from the toner accumulation section 51 of the all cleaning section 24.
a toner conveying belt 56 that conveys the conductive magnetic toner 35 to the toner accumulating section 54 of the background cleaning section 23 and a toner conveying belt 56 that conveys the conductive magnetic toner 35 from the toner accumulating section 50 of the background cleaning section 23 to the toner accumulating section 54 of the toner supply section 21; It consists of a conveyor belt 57. Toner transport belt 56°5
7 is, for example, an endless piece made of magnetic material,
Tension is applied between rollers that are driven to rotate and are disposed around the circumference, so that the conductive magnetic toner 35 is conveyed while adhering to the surface of the magnetic material.

In this configuration, a toner image is formed on the surface of the recording belt 27 that is moved by the toner supply section 21 and the image recording section 22, similar to the operation based on the basic principle described above. Then, in the background cleaning section 23, the conductive magnetic toner, which has no charge, remains on the surface of the recording belt 27 and cannot be moved toward the recording head 37 due to the magnetic force of the fixed magnets 41 and 42 in the image recording section 22. 35 is separated from the surface of the recording belt 27 and attached to the surface of the sleeve roll 43 due to the magnetic force of the magnet roll 44, and furthermore, because the magnet roll 44 is rotationally driven to the left in the figure, this conductive magnetic toner 35 is conveyed on the surface of the sleeve roll 43 in the right direction in the figure, and is scraped off into the toner collection container 45 by a toner scraping member (not shown). In this way, the recording belt 27
The unnecessary conductive magnetic toner 35 on the surface is removed, and the toner image formed with only the necessary conductive magnetic toner 35 remaining is conveyed to the image display section 25 while remaining attached to the surface of the recording belt 27, and the image is displayed. is displayed.

After displaying the image, the toner image is conveyed to the all-cleaning section 24 while remaining attached to the surface of the recording belt 27. Then, in the all-cleaning section 24 , the conductive magnetic toner 35 previously attached to the surface of the sleeve roll 46 by the magnetic force of the magnet roll 47 comes into contact with the conductive magnetic toner 35 forming the toner image on the surface of the recording belt 27 . As a result, these become electrically conductive, but at this time, since the sleeve roll 46 is connected to the ground potential, the conductive magnetic toner 35 on the surface of the recording belt 27 loses its charge.
Due to the magnetic force of the magnet roll 47, the recording belt 27 is separated from the surface of the recording belt 27 and attached to the surface of the sleeve roll 46, and the magnet 1-roll 47 is rotated to the left in the figure, and the sleeve roll 46 is rotated to the right in the figure. As a result, the 5R electromagnetic toner 35 is conveyed on the surface of the sleeve roll 46 in the right direction in the figure, and is scraped off into the toner collection container 48 by a toner scraping member (not shown). The recording belt 27 from which the conductive magnetic toner 35 (that is, the toner image) has been removed in this manner is conveyed to the toner supply section 21 again, and a similar uniform display device is performed.

On the other hand, in the background cleaning section 23 and the all cleaning section 24, the toner collection container 45.4
The conductive magnetic toner 35 scraped off in the toner transport belt 56 . 8 is collected in the toner collecting portion 50 . 57 , the toner is conveyed onto the toner accumulation section 54 of the toner supply section 21 . Then, the conductive magnetic toner 35 on the toner conveying belts 56, 57 is scraped off onto the toner collecting section 54 of the toner supply section 21 by a toner 41 removing member (not shown). The conductive magnetic toner 35 scraped onto the toner collecting section 54 of the toner supply section 21 is conveyed in the axial direction of the sleeve roll 33 by the spiral roll 55, and
3 and used again.

In the uniform display device using the magnetic stylus recording method described in detail above, the displayed image appears, for example, as a black image with high resolution (16 lines/m) on a white background. Since it is used as a reflective display, it does not have the problems of flickering and radiation damage unlike CRT displays, and has the excellent advantage of not causing discomfort to viewers.

However, the conventional image display device described above has the following problems. That is, in this type of image display device, a toner image is formed on the surface of the recording belt by injecting charge into the conductive magnetic toner as described above.
An unfixed toner image is displayed within a display window of an image display section. However, depending on the usage environment of the image display device, the display window of the image display section may be charged with static electricity. If the electric field strength due to static electricity generated in this display window is equal to or larger than the electrostatic force generated between the recording belt and the toner image, the toner image on the recording belt surface becomes extremely unstable, and the surface of the recording belt It floats from the screen and scatters inside the display window. At this time, there was a problem in that the toner image was significantly disturbed and the displayed image became extremely difficult to see due to the scattered and adhered toner on the display window.

(Problems to be Solved by the Invention) As described above, when the image display section is charged with static electricity, the powder image formed on the surface of the recording member is scattered toward the image display section due to the static electricity. There is a problem in that the screen gets dirty and the displayed image becomes very difficult to see.

Therefore, the present invention solves the above problems, and can prevent the powder image formed on the surface of the recording member from scattering toward the image display section due to static electricity, and effectively remove dirt from the image display section. An object of the present invention is to provide an image display device that can prevent the above problems.

[Structure of the Invention] (Means for Solving the Problems) The present invention forms an unfixed image with powder on the surface of a moving sheet-like recording member, and transfers the formed powder image to the surface of a moving sheet-like recording member. In an image display device that conveys the powder image to an image display section and displays the powder image on the image display section, a sheet-shaped transparent conductive member is provided between the image display section and the image forming surface of the recording member. is provided, and this transparent conductive member is connected to the same potential as the conductive layer of the recording member.

(Function) Normally, when static electricity is generated due to the environment in which the image display device is used, the voltage generated by the static electricity is several tens of volts to several tens of volts, and the resistance value for grounding this static electricity is approximately 1012 [Ω] or less. If so, it is sufficient. Therefore, the resistance value connected to the same potential as the conductive layer of the recording member is approximately 1.
By providing a sheet-like transparent conductive member of Ω or less between the image display section and the image forming surface of the recording member, the powder image formed on the surface of the recording member is transferred to the image display section side by static electricity. It is possible to prevent it from scattering to. Also,
Even if the powder image is scattered, the powder will adhere to the surface of the transparent conductive member, so the image display section will not become dirty.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. Note that the same parts as in FIG. 6 are given the same reference numerals, and the explanation thereof will be omitted, and only the different parts will be explained. 1st
As shown in the figure, in the image display section 25, a display window 49
A sheet-like transparent conductive member is provided between the recording belt 27 and the recording belt 27.
For example, a transparent conductive sheet 61 having a resistance of about 1012 [Ω] or less is arranged. The transparent conductive sheet 61 is
Its upper and lower ends are held by sheet holders 62 and 63, respectively, and are connected to the same ground potential as the conductive layer of the recording belt 27. The transparent conductive sheet 61 is, for example, a carbon black-filled conductive cast-molded polycarbonate film, specifically Macrohole KL3-1009 (thickness: 40 mm) manufactured by Bayer Japan Co., Ltd.
A sheet with a surface resistance value of 200 [Ω] is suitable.

In this way, the recording belt 27 is guided between the display window 49 and the recording belt 27! By arranging the transparent conductive sheet 61 connected to the same ground potential as l, the recording belt 27
The toner image formed on the surface of the display window 49 can be prevented from scattering to the inside of the display window 49 due to static electricity generated in the display window 49. Furthermore, even if the toner image is scattered, the conductive magnetic toner 35 adheres to the surface of the transparent conductive sheet 61, so the display window 49 will not become dirty.

2 and 3 show other embodiments of the invention. In this embodiment, the transparent conductive sheet 61 is attached to the recording belt 2.
It is designed to move relative to 7. In this case, it is preferable to move the transparent conductive sheet 61 at the same speed as the recording belt 27, but relative movement is also possible. That is, the upper end of the transparent conductive sheet 61 is wound around the upper take-up roller 64, and the lower end is wound around the lower take-up roller 65. By selectively driving these take-up rollers 64 and 65 to rotate with a motor (not shown), the transparent conductive sheet 61 can be moved upward or downward. In addition, cleaner rollers 66 and 67 for removing the conductive magnetic toner 35 adhering to the surface of the transparent conductive sheet 61 are arranged in front of each of the take-up rollers 64 and 65.

According to this embodiment, the same effects as in the previous embodiment can be obtained, and furthermore, when the conductive magnetic toner 35 adheres to the surface of the transparent conductive sheet 61, for example, when displaying the next image, the transparent conductive For example, the sheet 61 is attached to the recording belt 27.
At the same time, by moving in the same direction (upward), the transparent conductive sheet 61 is made up of the scattered conductive magnetic toner 35.
The stain is temporary, and there is no risk that the scattered conductive magnetic toner 35 will accumulate and become even more difficult to see.

In addition, a cleaner roller 6 is provided in front of the upper take-up roller 64.
6, the attached conductive magnetic toner 35
The transparent conductive sheet 61 will not get caught up in the transparent conductive sheet 61, and the transparent conductive sheet 61 will not be damaged thereby. Note that when the transparent S-conductive sheet 61 is completely wound up by the upper winding roller 64, a signal indicating this is sent from a detector (not shown) to a controller (not shown). The controller is equipped with a control program in advance, and under the control of the controller, the transparent conductive sheet 61 is rewound onto the lower winding roller 65 before the next image is displayed. In this case as well, a cleaner roller 67 is provided in front of the lower take-up roller 65.
Therefore, the adhered conductive magnetic toner 35 will not be caught up in the transparent conductive sheet 61, and the transparent conductive sheet 61 will not be damaged thereby.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to prevent the powder image formed on the surface of the recording member from scattering toward the image display section due to static electricity, and to effectively prevent dirt on the image display section. It is possible to provide an image display device that can prevent this from occurring.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal side view showing one embodiment of the present invention, FIG. 2 is a longitudinal side view showing another embodiment of the present invention, and FIG. 3 is a perspective view of the image display section in the embodiment of FIG. Figure 4 is a vertical side view to explain the basic principle of magnetic stylus recording method, Figure 5 is a vertical side view showing an enlarged view of the main parts in Figure 4, and Figure 6 is a conventional image. FIG. 3 is a vertical side view showing the display device. 20... Image transport section, 21... Toner supply section, 22... Image recording section, 23...
・Background cleaning section, 24... All cleaning section, 25... Image display section, 2
6... Toner transport section, 27... Recording belt (sheet-like recording member), 35... Conductive magnetic toner (powder), 37...・Recording head, 4
9...Display window, 61...Transparent conductive sheet (sheet-shaped transparent conductive member), 66°67...
...Cleaner roller (powder removal means). Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4 Figure 6

Claims (8)

[Claims] (1) A sheet-shaped recording member that moves; An image forming means that forms an image with powder on the surface of this recording member; A powder image formed by this image forming means is moved to a predetermined position as the recording member moves. and a sheet-like transparent conductive member provided between the image display section and the image forming surface of the recording member. Characteristic image display device. (2) The recording member has a conductive layer connected to a predetermined potential, and the transparent conductive member is connected to the same potential as the conductive layer. Image display device. (3) The image display device according to claim 1 or 2, wherein the transparent conductive member has a resistance value of about 10^1^2 [Ω] or less. (4) The image display device according to claim 1, wherein the transparent conductive member moves relative to the recording member. (5) The image display device according to claim 1 or 4, wherein the transparent conductive member is provided with powder removing means for removing powder adhering to the surface of the transparent conductive member. (6) The image display device according to claim 1, wherein the recording member is formed in an endless shape. (7) The image display device according to claim 1, wherein the powder is a conductive magnetic toner. (8) The image display device according to claim 1, wherein the image forming means forms an image using a magnetic stylus recording method.