JPS62101461A - Static recording head - Google Patents

Abstract

PURPOSE:To make the quantity of ions passing through an open hole constant and thereby provide a stable recording image always by generating ions in the second electrode through application of a DC voltage between the first and the second electrodes holding a dielectrics and controlling ions at the third and the fourth electrodes to maintain the static charge between the second and the third electrodes at a constant level. CONSTITUTION:A voltage value which allows an electric discharge to occur between the second electrode 2 and the first dielectrics 15, e.g. 1.2KV of DC voltage is applied to the plus polarity of the first electrode 1 and the minus polarity of the second polarity 2 between the first electrode 1 and the second electrode 2 from a DC power supply 14. It is arranged so that a DC voltage of 2KV may be applied to the second electrode 2 from the first DC power supply 19, a DC voltage of 900V to the third electrode from the second DC power supply 20, a voltage of 800V to a point requiring a static charge and of 1,100V to a point requiring no static charge respectively as a signal voltage corresponding to an image pattern on the fourth electrode 5 from a signal power supply. The polarity of a static latent image on the upper surface of a recording medium 6 in the above example is negative. However, when creating a positive latent image, the polarity from each power supply has only to be reversed.

Description

Detailed Description of the Invention A. Object of the Invention [Industrial Field of Application] The present invention relates to an apparatus for forming an image by using an electric field generated in an aperture, and in particular, an apparatus for forming an image by using an electric field generated in an aperture, in particular, an apparatus for forming an image by using an electric signal to cause charged particles to pass through an aperture. The present invention relates to an electrostatic recording head that obtains images by controlling the process.

[Conventional technology]

Conventionally, this type of technology is disclosed in U.S. Patent No. 3,689.9.
This is proposed in Specification No. 35. This method uses an aperture board (hereinafter referred to as an aperture board) in which two electrodes are provided with an insulating layer in between and a large number of holes are drilled in a row.This aperture board allows charged particles to pass through each hole. An image is obtained by controlling the charged particles that have passed through the holes selectively to adhere to a recording member provided on the opposite side of the charged particle supply source.

That is, in FIG. 4, a third electrode 3, a second insulator 4, and a fourth electrode 5 are stacked, and a corona wire surrounded by a conductive shield 8 is placed on the back of the third electrode 3 as a source of charged particles. A high voltage is applied from the high-voltage DC power source 1o to cause corona discharge, and a signal voltage corresponding to the image pattern is applied between the third electrode and the fourth electrode from the signal power source 9. A DC voltage is applied between the fourth electrode 5 and the recording medium 6 from a DC power source 11 to control the passage of charged particles through the holes 16 formed in the laminate of the third and fourth electrodes and the second insulator 4. An electrostatic latent image is obtained on a recording medium.

However, in the above-mentioned method, the density of generated charged particles is low and high-speed recording cannot be performed. As a solution to this problem, JP-A-59-6
As proposed in Publication No. 8267, corona wire 7
There is also a method of placing the third electrode 3 and the third electrode 3 in close proximity, but vibration of the corona wire 7 or the like may change the density of charged particles passing through the hole, or a spark discharge phenomenon may occur between the electrode and the corona wire, making it impractical for practical use. It has not yet reached the point where it has become a reality.

A method for generating a large amount of charged particles is proposed in US Pat. No. 4,180.257.

That is, as shown in FIG. 5 (the same reference numerals as in FIG. 1 indicate the same functional parts), an insulator 13 and a fifth electrode 12 are placed on the upper surface of the third electrode 3.
and applying an AC voltage between the third electrode 3 and the fifth electrode 12 from the AC power supply 21 to connect the third electrode 3 and the insulator 13.
Charged particles are generated by causing a discharge to occur between the electrodes, and the electric field is controlled by the third and fourth electrodes 3 and 5 as described in FIG.

[Problem that the invention seeks to solve]

The latter method can greatly improve the generation density of charged particles A and is suitable for high-speed recording, but if the control electrode is replaced due to damage to the third electrode 3, etc.
Fourth electrode5. Since they are bonded together through insulators 13 and 4, they all have to be replaced, resulting in problems such as an increase in copying costs.

An object of the present invention is to provide an apparatus which can eliminate the above-mentioned drawbacks and at the same time achieve a uniform recording density of three dots.

Configuration of the invention [Means for solving the problem] The present invention provides first, second, third and fourth electrodes l, 2φ3, 5
A first dielectric or semi-insulating material 15 is provided between the first electrode 1 and the mesh-like second electrode 2, and a 30th fourth electrode 3.
A second insulator 4 is interposed between the electrodes 5 and 5, and the first and second electrodes 1 and 2 are connected to the first electrode group, and the third electrode 4 is connected to the electrode 3.
5 is a second electrode group, and the two groups are arranged with a gap, and the third electrode 3, the second insulator 4, and the fourth electrode 5 have an opening 16 and face the opening 16. Arrange the recording medium 6 so that This electrostatic recording head is further characterized in that a signal voltage is applied between the fourth electrode 5 and the recording medium 6 from a signal power supply 9.

[For production]

Ions are generated at the second electrode by sandwiching the dielectric 15 between the first and second electrodes 1 and 2 and applying a DC voltage,
By performing ion control with the 30th fourth electrode 3φ5,
Since the distance between the second electrode 2 and the third electrode 3 is always kept constant, the amount of ions passing through the aperture 16 is constant, and a stable recorded image can always be obtained.

In addition, the first and second electrodes 1-2 are the first electrode group, and the third and second electrodes 1-2 are the first electrode group.
Since the electrodes 3 and 5 are constructed separately from the second electrode group and arranged with a gap between them, they can be easily replaced if they are damaged.

〔Example〕

FIG. 1 shows an embodiment of the present invention, and the same reference numerals as in FIGS. 4 and 5 indicate the same functional parts. An example of the material φ value of each part will be explained below.

Conventional Example The first electrode as shown in FIG. 1 is placed on one side of the third electrode 3 in FIG. 4! - Arrange the first dielectric layer 15 and the second electrode 2.

The first electrode l is copper foil, and the first dielectric layer 15 has a thickness of 40
A Mn-Ni-0 ceramic plate adjusted to 0 pLm*resistivity of 3 x 109 Ω-c was used. However, Al
It is also possible to create it by adding ZrO2 or the like to 2O3 as an elliptical additive.

Alternatively, the resistance value may be adjusted by anodizing an aluminum plate to 100-500 m and impregnating it with a resin or the like. In this case, the aluminum substrate may be used as the first electrode 1, and the anodic oxide may be used as the first dielectric material 15.

As the second electrode 2, a mesh electrode made of stainless steel foil with a thickness of 1107 L was used. A stainless steel foil with a thickness of lO#Lm is used for the third electrode 3, and a stainless steel foil with a thickness of 100 mm is used for the second insulator 4.
GM polyimide resin was used. This second insulator 4 is made of mica, A 1203-Z ro2 ceramic, etc.
Any material that maintains electrical insulation may be used. For the fourth electrode 5, a copper foil with a thickness of 20 ILm is used, and a hole 1 of NN100IL is directly inserted so as to penetrate from the third electrode 3 to the fourth electrode 5.
6 was established. Also, the distance between the second electrode 2 and the third electrode 3 is 0.2
■They were arranged in parallel so that

The recording medium 6 may be any dielectric material capable of retaining electrostatic charges, but in the present invention, an aluminum cylinder 17 with a diameter of 80+wm is used, and its surface is coated with a thickness of 40#L.
The dielectric material 18 was anodized so as to have a diameter of m, impregnated with an ultraviolet curable resin in the voids on its surface, and then cured.

Further, the distance between the recording medium 6 and the fourth electrode 5 was set to 0.2 ms.

With the above configuration, a direct power source 14 is connected between the first electrode 1 and the second electrode 2, and a discharge is generated between the second electrode 2 and the first dielectric 15.
For example, a DC voltage of 1.2 KV is applied to the first electrode l.
The voltage was applied to the positive polarity of the second electrode 2 and the negative polarity.

The second electrode 2 is supplied with a DC voltage of -2K from the first DC power supply 19.
V, and the third electrode is supplied with a DC voltage - from the second DC power supply 20.
900V is applied to the fourth electrode 5 as a signal voltage according to the image pattern from the signal power supply 9, and 1800V is applied to the parts where static charge is required.
(2) A voltage of -ttoov can be applied to unnecessary locations.

In the above example, the polarity of the electrostatic latent image on the upper surface of the recording medium 6 is a negative latent image, but if a positive latent image is to be created, all the polarities from each power source may be reversed.

With the above configuration, the recording medium 6 is moved at a circumferential speed of 1801 square meters per second by a drive source (not shown). An electrostatic latent image is formed on the recording medium 6 that has passed through the electrode group, and is visualized with colored charged particle toner at a development position 21 using commonly used powder development, liquid development, etc.

The toner image is transferred to the recording paper 24-1- at the transfer position 22 by means such as fE force transfer, corona transfer, or a thermal belt.

Recording medium 6-1 after transfer - Transfer residual toner is scraped off and cleaned by means such as a blade or paper wave at a cleaning position 25, and if there is any unnecessary charge remaining, it is removed by a static eliminator 26 such as an AC corona discharge. The surface is kept uniformly at approximately zero potential by means such as the above, and then used again.

In the configuration of L, the first electrode l and the second electrode 2 are
By making the electrode group, the third electrode 3 and the fourth electrode 5 into the second electrode group, the first electrode group and the second electrode group can be divided, so if the opening 16 is clogged. , the first electrode group can be removed easily, and the fifth electrode group can be easily removed by removing the first electrode group.
Since it is not necessary to replace all the electrodes due to damage to the third electrode 3 as in the case shown in the figure, copying costs can be reduced.

In addition, discharge is constantly occurring between the first electrode 1 and the second electrode 2, and no corona wire is used, so there is no vibration, and the distance between the ion source and the electrode is always kept constant, resulting in a stable image. is obtained.

Since there is no need to apply high-frequency alternating current to the fifth electrode 12 and third electrode 3 as in the example in Figure 5, there is no need to consider radio wave interference to the surroundings, and the manufacturing cost of the device body is also reduced. Is possible.

FIG. 2 is a developed view of one embodiment of the electrode group shown in FIG.

In FIG. 2, there are 16 openings 16 per hole 18-1 in the traveling direction of the recording medium 6. 18-2, 1B-3,
...16-18 arranged diagonally, 1 width 300 lLm
The third electrode 3 having the same number of openings 16 as 3-1. 3
-2.3-3, ...3-18 are arranged electrically independently in the traveling direction of the recording medium, and the gap between each electrode is 30.
It was created to be 0#Lm. The DC voltage applied to the third electrodes was configured to be applied individually and independently from the second DC power source 20, so that 1600 V could be applied to areas where ions were not needed, and 1800 V could be applied to areas where ions were needed. By individually applying a signal voltage corresponding to the image pattern to the fourth electrode 5 from the signal power supply 9, a clear electrostatic latent image is obtained on the recording medium 6 by the combination of the third electrode 3 and the fourth electrode 5. It became possible. In addition, the second electrode 2 has a 200 mesh porosity of 50.
I made it by etching to make it %. This may be a metal wire mesh such as tungsten wire.

FIG. 3 shows another embodiment in which an insulator 27 is inserted between the first dielectric 15 and the second electrode 2, and the first id electric material 1 is connected to the first electrode 1.
This is a method of blocking current that does not contribute to corona discharge from flowing to the second electrode 2 through the first dielectric 15 and allowing discharge to occur between the first dielectric 15 and the second electrode 2. Note that the same effect can be obtained by providing a slight gap between the first dielectric 15 and the second electrode 2 instead of the insulator 27.

Note that the second electrode 2 in FIGS. 1 and 3 represents a part of the mesh electrode as shown in FIG.

Further, even if the DC power source 20 and the signal power source 9 are replaced in FIG. 1, the effect of the electric field within the opening 16 remains the same.

C. As described in the section on effects of the invention, a DC voltage is applied between the first and second electrodes 1 and 2 to cause discharge, and high-density ions are generated at the second electrode 2. Coupled with maintaining a constant gap between the second electrode 2 and the third electrode 3, the amount of ions passing through the aperture 16 is constant. Meanwhile, +119 and 20 are DC power supplies, and 9 is a signal power supply.

Since ion control is performed between the 30th and 4th electrodes 305 that form the holes, a stable recorded image can always be obtained.

In addition, since the first electrodes 1 and 2 groups and the second electrodes 3-4 groups are each configured as a single unit and arranged with a gap, the first electrode and second electrode group
The electrode group can be replaced individually, which reduces copying costs compared to the previously known integrated system (example in FIG. 5). When manufacturing an ion head, in the case of an integrated type, the second and third φ
Although it is necessary to carefully align the fourth electrode, the present invention reduces the number of steps involved and makes it possible to reduce the defective rate during manufacturing. Furthermore, since no alternating current voltage is used, there is less damage to the first and second electrode groups, and this also has the effect of reducing costs.

[Brief explanation of drawings]

FIG. 1 is an embodiment of the present invention, FIG. 2 is a developed perspective view of the electrode, FIG. 3 is a modified example of the electrode, and FIG. 4 is an explanatory diagram of a conventional example. l is the first electrode, 2 is the second electrode, 3 is the third electrode, 5 is the fourth electrode
Electrode, 6 is a recording medium, 16 is an opening, 14 goes to Mosquito Elimination History Japanese Patent Publication BffG2-101461 (5)==) ＼

Claims (1)

[Claims] (1) It has first, second, third, and fourth electrodes, and a first dielectric or semi-insulating material is provided between the first electrode and the mesh-like second electrode;
A second insulator is interposed between the third and fourth electrodes, and the first and second electrodes are connected to the first electrode group and the third and fourth electrodes.
The electrodes are a second electrode group, and the two groups are arranged with a gap between them, and the third electrode, the second insulator, and the fourth electrode have an aperture, and the recording medium is placed so as to face the aperture. Place the first and second
A static electricity source characterized in that a DC voltage is applied between the electrodes, a DC voltage is applied to the second and third electrodes from respective power sources, and a signal voltage is applied from a signal power source between the fourth electrode and the recording medium. Electric recording head.