JPS63121863A - Electrostatic recording device - Google Patents

Abstract

PURPOSE:To prevent unnecessary toner from sticking and to improve picture quality by applying a voltage selectively between a recording electrode and a counter electrode and forming a toner image on an insulating recording body, and forming part of the surface of the insulating recording body by using a water-repellent material. CONSTITUTION:The recording electrode 1 constitutes a multistylus where electrode styli 2 in plural groups are arranged in array. On the other, a magnetic toner developing device 6 which has a rotating magnetic roller 5 is installed in a fixed cylindrical sleeve 4 opposite the recording electrode 3 across the insulating recording body 3. Further, the counter electrode 7 which is divided into plural segments is arranged on the cylindrical sleeve 4 in contact. When an image is recorded, magnetic toner is transferred to the outer periphery of the cylindrical sleeve 4, a voltage corresponding to an image signal is applied to an electrode stylus 2, and a voltage having the opposite polarity is applied to the counter electrode 7 to stick the magnetic toner on the insulating recording body 3, forming a toner image. The water-repellent material layer 33 is formed on the flat surface side of the insulating recording body 3 to make the surface hard to wet with water molecules, so no excessive toner is stuck, thereby suppressing fogging.

Description

[Detailed description of the invention] [Table of contents] - Overview - Field of industrial application - Prior art - Problems to be solved by the invention - Means for solving the problems - Effects - Examples - Description of the invention Effect [Summary] By composing the surface of the insulating recording medium with a water-repellent material, it is possible to prevent unnecessary toner from adhering to the surface of the insulating recording medium and improve image quality during times of high humidity or when the device is stopped. Electric recording device.

[Industrial application field]

The present invention relates to an electrostatic recording device, and more particularly to an improvement in an insulating recording medium for forming toner images.

An outline of the electrostatic recording device according to the present invention will be explained with reference to FIGS. 6 to 8.

FIG. 6 shows the configuration of the recording section, in which the recording electrode 1
constitutes a multi-stylus in which a plurality of groups of electrode needles 2 are arranged in a row. An insulating recording body 3 made of a dielectric film is brought into contact with this recording electrode 1 . On the other hand, a magnetic toner developing device 6 having a rotating magnetic roller 5 is installed inside the fixed cylindrical sleeve 4 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.

When recording, magnetic toner 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. , magnetic toner is attached to the insulating recording medium 3 to form a toner image.

FIG. 7 shows an enlarged view of how magnetic toner is attached to the insulating recording medium 3 and a toner image 19 is formed when a voltage is applied to the electrode needle 2. Code 2 in the diagram
, 3, 4.5.7 correspond to FIG. For example, while the insulating recording body 3 is moving in the direction of the arrow shown in the figure, voltage pulses of opposite polarity are applied to the electrode needle 2 and the counter electrode 7, respectively. Aerial discharge occurs in the microgap, 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, and a toner image 19 is formed on the insulating recording medium 3 due to the Coulomb force with the latent image charge 20. be done. In addition, in order to maintain micro-gaps necessary for generating an air discharge on the surface of the insulating recording body 3 on the electrode needle 2 side,
An uneven layer having a predetermined height is formed.

FIG. 8 shows the overall configuration of the recording apparatus, and the symbols 1, 3, 4, 6.7 in the figure correspond to those in FIG. The insulating recording material 3 is made of a dielectric film in the form of a continuous belt and is moved to a roller 8.
, 9.10 at a constant speed. The tip of the recording electrode 1 is placed in contact with the inside of the insulating recording body 3. Further, a magnetic toner developing device 6 having a counter electrode 7 on the surface of the cylindrical sleeve 4 is installed facing the recording electrode 1.

As explained with reference to FIGS. 6 and 7, the insulating recording body 3
After forming the toner image on the insulating recording medium 3, the insulating recording medium 3 is rotated, the recording paper 12 is conveyed parallel to the insulating recording medium 3 by the roller 9 that is in contact with the ground, and the toner image is transferred from the back side using the transfer roller 13. The image is transferred to recording paper 12. After that, the recording paper 12
The upper transferred image is fixed to the recording paper 12 by the fixing device 14. On the other hand, the insulating recording body 3 is further rotated, and at the portion where the corona static eliminators 16 and 17 are arranged facing each other on both sides of the insulating recording body 3, alternating voltages having different phases are applied to the respective corona static eliminators. When the magnetic toner is added, the charge of the magnetic toner remaining on the insulating recording medium 3 is erased, and the force with which the magnetic toner adheres to the insulating recording medium 3 is weakened. Furthermore, an insulating recording body 3
When the toner is rotated and conveyed to the recording section, the remaining magnetic l.toner is collected by the magnetic force of the magnetic roller 5 in the magnetic toner developing device 6.

As described above, the recording process is repeated to output an image, and since such a recording device performs the latent image forming process using the recording electrode and the developing process using the developing machine at the same time, it is difficult to use an output device such as a facsimile. This has the advantage of simplifying the device configuration, making it smaller and cheaper. Furthermore, since magnetic toner is used, untransferred toner can be collected in a developing machine and reused without cleaning, which has the advantage of easy maintenance and low consumables prices.

FIG. 9 shows a configuration in which the electrostatic recording device described above is used as an image display device. This electrostatic recording device for image display consists of a recording section A, a display section B, and a static elimination section C. Recording section A
The structure and operation of the static eliminator C are the same as those of the electrostatic recording apparatus shown in FIGS. 6 to 8. The toner image formed on the insulating recording medium 3 in the recording section A is transferred to the display section B and displayed. During this image display period or in the image input waiting state, the movement of the insulating recording body 3 is stopped, and the static elimination action and rotation of the magnetic roller are also stopped.

[Conventional technology]

The insulating recording material of conventional electrostatic recording devices has a structure in which a spacer material is fixed to a base film made of polyethylene terephthalate film using a binder material to form an uneven surface, and a toner image is formed on the flat side of the base film. Was.

[Problem that the invention seeks to solve]

In the electrostatic recording device using the conventional insulating recording material, when the atmospheric humidity becomes high (70% RH or more, 25'
c) There is a problem in that excess toner adheres to the background parts of characters, resulting in background smear (hereinafter referred to as smudge), which significantly deteriorates image quality.

The reason for this is that when the humidity is high, the surface of the insulating recording medium gets wet due to moisture in the atmosphere, forming a thin film of water, and a large van der Waals force acts on the toner, causing the toner to adhere to the surface of the insulating recording medium. It is thought that this is because of this.

Furthermore, in the electrostatic recording device for image display, when the continuous heddle-shaped insulating recording medium is stopped during image display, toner particles adhere to the portion of the insulating recording medium facing the developing machine. At this time, since the magnetic roller is also stopped, there is no cleaning effect by the magnetic brush, and therefore, the adhesion of toner particles increases and horizontal streaks of toner are formed on the insulating recording medium. Such horizontal stripes appear on the display when the screen is scrolled, causing discomfort and deteriorating display quality.

The present invention was made in view of the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide an electrostatic recording device that improves image quality by preventing unnecessary toner from adhering to an insulating recording medium. do.

[Means for solving problems]

In order to achieve the above object, in the present invention, a recording electrode and a magnetic toner developing machine are disposed facing each other with an insulating recording body interposed therebetween, and a sleeve containing a magnetic roller of the magnetic toner developing machine is disposed opposite to the recording electrode. A counter electrode divided into a plurality of segments is disposed, and a voltage is selectively applied between the recording electrode and the counter electrode to form a toner image on the insulating recording body, and then the toner image is displayed as an image. Or, in an electrostatic recording device that repeatedly performs recording while transferring the magnetic toner onto a recording paper, then removing the electric charge of the magnetic toner on the insulating recording body, and collecting the magnetic toner by the magnetic force of a magnetic toner developing machine. - To provide an electrostatic recording device characterized in that at least a part of the surface of the insulating recording body is made of a water-repellent material.

[For production]

Moisture in the air tends to adhere to the portion made of the water-repellent material even under high humidity, and therefore, the adhesion of unnecessary toner particles is suppressed.

〔Example〕

FIG. 1 is a sectional view of an embodiment of an insulating recording body 3 according to the present invention. Reference numeral 30 denotes a base film made of polyethylene terephthalate, 31 a spacer material for obtaining microgaps necessary for causing an air discharge, and 32 a binder material for fixing this spacer material 31 to the base film 30.

33 is a water-repellent material layer made of fluororesin.

The water-repellent material layer 33 is coated on the base film 30 (thickness: 1 to 15 μm) and is coated on the flat surface of the insulating recording body 3 (
toner adhesion surface). The tQ aqueous material layer 33 may be laminated to the base film 30.

By providing such a water-repellent material layer 33 on the flat surface side of the insulating recording medium 3, the surface becomes difficult to get wet by water molecules, excess toner does not adhere, and fogging is suppressed.

FIG. 2 is a sectional view of another embodiment of the insulating recording body 3 according to the present invention. In this embodiment, the IB water-based resin layer 3 is applied not only to the flat side of the insulating recording medium 3 but also to the uneven surface side.
There are 3. With such a configuration, the fogging phenomenon can be suppressed even more strongly.

FIG. 3 is a sectional view of still another embodiment of the insulating recording medium according to the present invention. In this embodiment, a water-repellent material layer 34 such as polyphenylene sulfide is applied to the insulating recording body 3.
It is composed as a Heath film itself.

The table below shows the materials of the surface layer of the insulating recording material, the contact angle of the materials with water, and the state of fogging. The investigation humidity is 80% RH (25°C).

The above results show that the occurrence of fogging can be suppressed by forming the surface of the insulating recording medium with a water-repellent material having a contact angle with water of 75 degrees or more.

FIG. 4 is a sectional view of still another embodiment of the insulating recording body 3 according to the present invention. In this example, the base film 30
(For example, a Mylar film with a thickness of 9 to 16 μm) is coated with a water-repellent material layer 35 on a part of the surface to a thickness of about 1 to 15 μm. Such an insulating recording body 3 is used in an electrostatic recording device for image display, as shown in FIG. The portion where the tΩ aqueous material layer 35 is provided is the seam portion of the belt of the insulating recording body 3 and the portion where the roller 10 is located on the opposite side when this seam portion comes to a position facing the developing device 6. . Since the thickness of the insulating recording medium 3 becomes thick at the joint portion of the belt, sufficient image density cannot be obtained with a predetermined recording voltage. Therefore, in order to remove this seam from the printing area, the seam is first detected by a sensor, and when the seam reaches the position of the developing machine, the movement of the insulating recording medium, the magnetic roller, etc. are stopped, and the image signal is output. Set to wait state. Subsequently, the insulating recording medium is moved to form an image by transferring image signals, and when the joint reaches the position of the roller 10, the movement of the insulating recording medium is stopped and an image is displayed.

At this time, the insulating recording body 3 is configured so that the water-repellent material layer 35 faces the developing machine. The drive control mechanism of the device is configured to perform the above operations, and such display operations are repeated to display continuous images. In such an image display device, the portion of the insulating recording member that faces the magnetic toner developer when it is in a state of waiting for an image signal or stopped while displaying an image is coated with a water-repellent material layer 35 to prevent toner particles from adhering to it. Ru.

〔Effect of the invention〕

As explained above, in the electrostatic recording device according to the present invention, by composing the surface of the insulating recording body on which the toner image is formed with a water-repellent material, fogging phenomenon can be prevented at times of high humidity, and image quality can be improved. will improve.

Furthermore, if a necessary part of the insulating recording medium is made of water-repellent material and used as an image display device, horizontal stripes due to toner adhesion will not be displayed on the screen when the screen is scrolled, and a good image can be obtained. There is no need to coat the entire surface with water-repellent material, which saves material.

[Brief explanation of the drawing]

1 to 4 are sectional views of different embodiments of the present invention, FIG. 5 is a block diagram of an electrostatic recording device for image display according to the present invention, and FIG. 6 is a diagram of an electrostatic recording device to which the present invention is applied. 15) A detailed view of the recording section of the electrostatic recording device to which the present invention is applied, FIG. 7 is an explanatory diagram of the recording operation of the electrostatic recording device to which the present invention is applied, and FIG. 8 is a configuration of the electrostatic recording device to which the present invention is applied. 9 are block diagrams of an electrostatic recording apparatus for image display to which the present invention is applied. 1... Recording electrode, 3... Insulating recording body,
4...Sleeve, 5...Magnetic roller,
6...Magnetic toner developing machine, 7...Counter electrode, 12
...recording paper, 19...toner image.

Claims (1)

[Claims] 1. A recording electrode (1) and a magnetic toner developing device (6) are arranged opposite to each other with an insulating recording body (3) interposed therebetween, and a magnetic roller (5) of the magnetic toner developing device (6) Containing sleeve (4)
A counter electrode (7) divided into a plurality of segments is disposed above the recording electrode (1), and a counter electrode (7) is arranged opposite to the recording electrode (1).
1) and the counter electrode (7) to form a toner image (19) on the insulating recording material (3), and then displaying the toner image (19) as an image or on a recording paper. (1
2), and then the charge of the magnetic toner on the insulating recording body (3) is removed, and the magnetic toner is collected by the magnetic force of the magnetic toner developing machine (6), and recording is repeatedly performed. An electrostatic recording device characterized in that at least a part of the surface of the insulating recording body (3) is made of a water-repellent material. 2. The electrostatic recording device according to claim 1, wherein the water-repellent material is made of a fluororesin material. 3. The electrostatic recording device according to claim 1 or 2, wherein the water-repellent material has a contact angle with water of 75° or more. 4. The insulating recording body (3) has a base film (30
) and a spacer material for forming micro-gaps for air discharge (3
1) and a binder material (32) for fixing the spacer material onto a base film, one side of the base film is a flat surface and the opposite surface is configured as an uneven surface formed by the spacer material. An electrostatic recording device according to any one of claims 1 to 3, characterized in that: 5. The electrostatic recording device according to claim 4, wherein the water-repellent material is coated on the entire flat surface side of the base film (30). 6. The water repellent material further includes the base film (30
6. The electrostatic recording device according to claim 5, further comprising a coating on the uneven surface side of the electrode. 7. The electrostatic recording device according to claim 4, wherein the base film itself is made of a water-repellent material. 8. The electrostatic recording device according to claim 4, wherein the water-repellent material is laminated and bonded to the entire surface of the flat surface of the base film (30). 9. The insulating recording material (3) is in the form of a continuous belt and is used for image display, and a part of its flat surface side is covered with a water-repellent material layer (35), so that when the insulating material stops moving, The image display device according to claim 1, wherein the drive control device is configured such that the water-repellent material layer (35) is disposed at a position facing the magnetic toner developing device (6). Electrostatic recording device.