JPS63161772A - Electrostatic picture displaying system - Google Patents

Abstract

PURPOSE:To require no memory buffer for the share of one picture and to omit the retransfer of picture data by turning a voltage applied on a destaticizer off and executing the control of only sequence by means of the rotation of a magnetic roller in case of displaying the screen which is formed the preceding time again. CONSTITUTION:In a picture displaying device where an electrostatic recording electrode 1 is arranged opposite to a developing machine 6 having a rotating magnetic roller through a no-end shape insulating recording body 3 and latent image and a toner image are respectively formed on two sides of the insulating recording body 3 and the deletion of both images is executed in the corotoron destaticizers 16 and 17, the pictures can be held by stopping the functions of the destaticizers 16 and 17 and making a magnetic brush 18 pass through with rotating the magnetic roller 5 in case of displaying the screen formed the preceding time again. In this sequence the toner image formed the preceding time can be displayed again without distortion. Thus, it is needless to form the picture again by utilizing a memory, so that the time spent in a picture data process and the time for data transfer can be saved.

Description

[Detailed Description of the Invention] [Summary] The present invention provides an image display device that forms and displays a toner image on an insulating recording medium using an electrostatic recording method. In order to eliminate the need for multiple memory buffers and to avoid retransferring image data, the static eliminator function is stopped, the magnetic roller inside the developing machine is rotated, and the sequence of passing the magnetic brush allows the previous image to be maintained well. It was designed to do so.

[Industrial application field]

The present invention relates to an electrostatic recording type image display device, and particularly to a device sequence effective for displaying a previously displayed screen again.

[Conventional technology]

FIG. 2 shows a configuration diagram of a conventional electrostatic recording type display device. In the figure, the configuration consists of a recording section A, a display section B, and a static eliminator C.

The recording section A is composed of a recording electrode 1 and a developing device 6, which are arranged to face each other with an insulating recording body 3 interposed therebetween.

The display section B consists of an insulating recording body 3. The static eliminator C is composed of corotron static eliminators 16 and 17, which are disposed facing each other with an insulating recording body 3 interposed therebetween.

The endless insulating recording medium 3 is moved at a constant speed in the direction of arrow Y by rollers 8.9.degree. 10.

FIG. 3 is a diagram illustrating the configuration of a conventional recording section A, in which the recording electrode 1 has a multi-stylus configuration in which electrode needles 2 consisting of a plurality of groups are arranged in a line. This recording electrode 1
An insulating recording body 3 made of a dielectric film is brought into contact with the recording medium.

On the other hand, a developing device 6 having a rotating magnetic roller 5 inside a fixed cylindrical sleeve 4 is installed at a position facing the recording electrode 1 with the insulating recording body 3 interposed therebetween. Further, on the cylindrical sleeve 4, a counter electrode 7 divided into a plurality of segments is arranged in close contact with each other.

To perform recording, magnetic toner 11 is transferred to the outer circumference of the cylindrical sleeve 4, a voltage corresponding to the image signal is applied to the electrode needle 2, and a voltage of opposite polarity is selectively applied to the counter electrode 7. As a result, the magnetic toner 11 is attached to the insulating recording medium 3 to form a toner image.

FIG. 4 shows a diagram of the recording principle of a conventional example. The figure shows a state in which a voltage is applied to the electrode needle 2, magnetic toner 11 adheres to the insulating recording medium 3, and a toner image 19 is formed. If voltage pulses of opposite polarity are applied to the electrode needle 2 and the counter electrode 7 while the insulating recording body 3 is moving, for example, in the direction of the arrow shown in the figure, the voltage between the electrode needle 2 and the insulating recording body 3 will change. An air discharge occurs in the microspace, and a latent image charge 20 is formed on the surface of the insulating recording body 3 on the electrode needle 2 side.

At the same time, charges of opposite polarity are injected into the toner at the tip of the magnetic brush 18 that has been carried onto the selected segment, attracting the Coulomb force of the latent image charges 20 and forming a toner image 19 on the insulating recording medium 3. is formed. Incidentally, an uneven layer having a predetermined height is formed on the surface of the insulating recording body 3 on the side of the electrode needle 2 in order to maintain the micro-gaps necessary for generating an aerial discharge.

The toner image formed in the recording section A in FIG. 2 moves to the display section B and is visually recognized. After that, the toner image 19 is
The charges on the latent image 20 are then removed by corotron static eliminators 16 and 17 provided on both sides of the insulating recording medium 3.

The static-eliminated toner image 19 has a weaker binding force on the insulating recording medium 3, so when it moves to the recording section A again, the developing machine 6
It is attracted by the magnetic force of the magnetic roller 5 inside and collected into the developing machine 6.

In the recording method described above, the insulating recording body 3 is used.

Furthermore, an uneven layer is formed on the recording electrode side of the insulating recording body 3. Therefore, in order to eliminate the electric charge of the toner image 19 and the electric charge of the latent image 20 existing via the insulating recording medium 3,
Corotron static eliminators 16 and 17 are provided on each side, and static electricity is removed from both sides simultaneously.

In conventional static elimination, static elimination has been made possible by charge coupling of corona ions with the toner image 19 or the latent image 20.

[Problem that the invention seeks to solve]

An image display device using a conventional electrostatic recording method is suitable for a low-cost, compact, large-screen output device because the process of forming a toner image is simple.

On the other hand, it is also true that large screen output devices require time to process large amounts of image data and to transfer data to the output device. For this reason, when it is desired to display the previous screen again, the conventional image display apparatus has the drawback that it requires the same amount of time as it takes to output a new screen.

The present invention has been created in view of the above-mentioned conventional drawbacks, and it is possible to quickly redisplay the previously displayed screen without requiring a memory buffer for one screen, and without retransferring image data. The purpose is to provide a display method.

[Means for solving problems]

As shown in FIGS. 1 and 2, the electrostatic image display system of the present invention connects an electrostatic recording electrode 1 and a developing device 6 having a rotating magnetic roller via an endless insulating recording medium 3. A latent image and a toner image are respectively formed on the front and back sides of the insulating recording body 3, and the images are erased using static eliminators 16 and 17.The image display device displays the previously formed screen again. At this time, the function of the static eliminators 16 and 17 is stopped, and the image is held by passing the magnetic brush Ql while rotating the magnetic roller 5.

[Effect]

In the electrostatic recording method, an insulating film is used as the insulating recording body 1 for the recording medium. Therefore, there is no leakage between the charges of the latent image formed on the surface and the toner image corresponding thereto, so there is no change in the attraction force. In other words, unless forced static electricity is removed, the toner image once formed will be returned to the magnetic brush 1.
There will be no disturbance even if it passes through 8.

Therefore, when displaying the previously formed screen again, it is possible to output the image by controlling the device sequence (static charge removal OFF, magnetic low magnetic low 5-9 rotation).

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

Note that, in order to make the explanation of the configuration and operation easier to understand, the same parts are given the same reference numerals throughout all the figures, and repeated explanation thereof will be omitted.

FIG. 1 is a sequence chart showing one embodiment of the present invention. The B side of FIG. 2 is the n-th screen, and the back side (on the static eliminator side) is the (n-1)th screen.

FIG. 1(a) shows a normal sequence. In this case, the conveyance motor of the insulating film 3, the rotating motor of the magnetic roller 5 in the developing machine, and the voltage application of the corotron static eliminators 16 and 17 are driven almost simultaneously to reach the position W(
(not shown) to form a toner image.

In addition, in this recording method, the recording electrode 1 of the insulating film 3
Since the uneven layer is formed on the side, if a seamless recording medium is used, it becomes expensive in terms of cost. Therefore, a seam detection sensor 12 is provided to exclude the seam portion from the image area. When outputting new screens one after another, images are output according to the normal sequence shown in FIG. 1(a).

On the other hand, if you want to display the screen that was previously displayed on the n-1th screen again, as in the previous screen display sequence shown in Figure 1 (bl), turn off the voltage application to the corotron static eliminator 16. The rotating motor of the magnetic roller in the developing machine is driven at the same time as the film is transported.The driving time is the same as when forming a new screen normally.With this sequence, the previously formed toner image can be displayed again without being disturbed. .

〔Effect of the invention〕

As explained in detail above, according to the electrostatic image display method of the present invention, when displaying the previously displayed screen again, there is no need to use memory to form the image again, so image data processing is not required. It saves time and data transfer time, and allows you to quickly redisplay a clear screen just by controlling the device sequence.

[Brief Description of the Drawings] Fig. 1 is a sequence chart showing an embodiment of the present invention, Fig. 2 is a configuration diagram of a conventional electrostatic image display device, and Fig. 3 is a diagram of a conventional electrostatic image display device. FIG. 4 shows a diagram of the recording principle of a conventional example. 1 and 2, 1 is a recording electrode, 3 is an insulating recording medium, 5 is a magnetic roller, 6 is a developer, 16 and 17 are static eliminators (corotron static eliminators), and 18 is a magnetic brush, respectively. . (Q)it sea γsis ”j (n-
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Claims (1)

[Claims] An electrostatic recording electrode (1) and a developing device (6) having a rotating magnetic roller (5) are arranged facing each other with an endless insulating recording body (3) interposed therebetween. In an image display device, a latent image and a toner image are respectively formed on the front and back sides of the sexual recording medium (3), and the images are erased using static eliminators (16, 17). , the static eliminator (1
6, 17) is stopped, and the image is held by passing the image through a magnetic brush (18) while rotating the magnetic roller (5).