JPS5852220B2 - corona poultry - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a corona discharge device in which the passage of a corona flow from a corona discharge electrode is controlled by a control electrode section, and an image is formed by the corona flow that has passed through the control electrode section. It is something.

[Prior art] As an electrostatic recording method, a control electrode section is attached to a corona discharger using a shield plate that maintains a uniform potential, and the passage of the corona flow from the corona discharge electrode is controlled by the control electrode section. has been devised.

An example of the electrostatic recording method using such a corona discharger is shown in the first example.
This will be explained with reference to Figure a and Figure 1.

FIG. 1A shows a pre-charging step in which an electrostatic recording material A having a conductive support 1 and a surface insulating layer 2 is uniformly charged, for example, positively (1) by a corona discharger 3.

In the next recording process shown in Figure 1, the uniform charge on the insulating layer 2 formed by pre-charging is selectively removed by a corona flow from a discharger 4 having a control electrode section that controls the passage of the corona flow. By doing so, an electrostatic image is formed on this insulating layer 2.

That is, a charge 5 having a polarity opposite to that of the pre-charging is selectively applied to the insulating layer 2, the uniform charge caused by the pre-charging is removed in an imagewise manner, and an electrostatic latent image is obtained by the resulting potential difference.

In order to obtain an electrostatic image, in addition to removing the uniform potential as described above, it is necessary to further increase the surface potential of the insulating layer image-wise by pre-charging, or to obtain an electrostatic image due to the potential difference even if the surface potential of the insulating layer is charged to the opposite polarity. can be obtained.

The electrostatic latent image formed as described above is developed by reversal development with a developer such as charged colored particles having the same polarity as the previous charge, as required.

FIG. 2 shows a cross-sectional perspective view of the discharger 4 described in FIG. 1 above.

In the figure, the discharger 4 includes a corona discharge electrode 6, a grounded conductive shield plate 8 surrounding the corona discharge electrode 6 and having a corona flow passage hole 7, and a It has an insulating layer 9 that does not obstruct the passage hole 7 and a control electrode 10 that applies a controlled signal.

Note that the corona discharge electrode 6 may be needle-shaped instead of linear,
A conductor 11 continuous with the electrode 10 also continues to a control circuit.

The following FIGS. 3 and 4 are cross-sectional views of the conventional discharge device 4 described above, and are used to explain the passage and blocking of charges at the control electrode portion.

In the figure, an AC voltage is applied to the corona discharge electrode 6,
The conductive shield plate 8 is grounded.

At this time, as shown in FIG. 3, when a negative (→ voltage) is applied to the control electrode 10, an electric field is generated that accelerates positive (-) charges in the passage hole γ and conversely blocks negative (→ charges).

Furthermore, when a positive (A) voltage is applied to the control electrode 10 as shown in FIG.
b) An electric field is created that blocks charges.

That is, if we pay attention to negative (C) charges, in the state shown in FIG. 3, they are blocked by the passage hole 7 and cannot pass through, but in the state shown in FIG. 4, they are accelerated and pass through.

Note that in FIGS. 3 and 4, solid arrows are lines of electric force indicating the state of the electric field within the passage hole.

As described above, an electrostatic latent image can be obtained by controlling the passage of the corona flow that reaches the recording material.

However, although the passage hole of the control electrode section through which the corona flow passes when reaching the recording material is shaped like a bow or a slit as described above, it is extremely narrow.

Therefore, when a conventional corona discharger is used as a means of generating corona flow, the efficiency is low because the corona flow that passes through this passage hole is only a small portion of the corona flow generated from the corona discharge electrode. .

〔the purpose〕

An object of the present invention is to concentrate the corona flow generated from the corona discharge electrode into the passage hole of the control electrode part arranged in the discharge opening of the shield plate, and to record the corona flow that enables efficient use of the corona flow. The present invention provides a corona discharger for use in the United States.

Example The present invention will be described in more detail below with reference to the drawings.

5 and 6 show a corona discharger according to the present invention in which a control electrode portion is added to the discharge opening of the shield plate.

The control electrode section here includes a conductor electrode 12 grounded from the corona discharge electrode side, an insulating layer 13, a control electrode 14 that applies a voltage to control the passage of the corona flow, and a passage hole 15 for the corona flow. It is configured.

The corona discharger according to the present invention shown in FIG. 5 has a corona discharge electrode 16 made of a corona wire, and a shield plate 17 with an electrode wall surrounding the area other than the discharge opening with a resistor such as conductive rubber. Configure.

The above control electrode section is provided at the tip of the discharge opening via a spacer 18 made of an insulating material.

At this time, a high voltage of positive polarity is applied to the head of the shield plate 170 by the power supply 19, and a continuous potential gradient is created by a voltage drop between the head and the lower part of the shield plate 170.

When a positive voltage is applied to the corona discharge electrode 16, an electric field having an equipotential surface shown by a solid line in the figure is obtained.

Note that the power supply 19a shown in the figure generates an electric field for directing the concentrated corona flow further toward the control electrode section.

As a result, the positive corona flow from the discharge electrode flows along the electric lines of force shown by dotted lines, and the corona flow is concentrated near the discharge opening of the shield plate 17.

When a corona flow is applied to the recording material through the control electrode in this state, the current density of the corona flow is high in the passage hole of the control electrode, so the passage rate of the corona flow is higher than when using a conventional corona discharger. As a result, the recording speed can be increased.

In the corona discharger shown in FIG. 6, the shield plate 17 made of the resistor described above in FIG. 5 is made of a plurality of conductive materials such as metals.

In the figure, reference numeral 20 denotes electrodes made of a conductive material such as metal, each of which is combined with a spacer 21 made of an insulating material to form a shield plate.

This shield plate is a corona discharge electrode 2 made of corona wire.
2 except for the discharge opening.

As in the case of FIG. 5, the control electrode section is provided at the tip of the discharge opening via a spacer 21 made of an insulating material.

At this time, the electrode 20 forming the shield plate as shown in the figure
A different bias voltage obtained by lowering the voltage of the power supply 23 by a resistor 24 is applied to each of the two.

In the case shown in the figure, a highly positive voltage is applied to the head, and the potential gradually decreases toward the bottom, creating a potential gradient that changes stepwise.

When a positive voltage is applied to the corona discharge electrode 22 in this state, an electric field having an equipotential surface shown by the solid line in the figure is obtained within the shield plate, as before.

As a result, the positive corona flow flows along the electric lines of force shown by dotted lines and concentrates near the discharge opening of the shield plate.

When a corona flow is applied to the recording material through the control electrode section in this state, the current density of the corona flow reaching the recording material is high, so recording can be performed at a higher speed than when using a conventional corona discharger. can.

Note that by changing the polarity of the bias voltage power source for the shield plate in FIGS. 5 and 6, it is also possible to concentrate the negative polarity corona flow in a part of the corona discharger.

Next, to show a specific example of the embodiment of the present invention, a tungsten wire with a diameter of 0.05 mm is used for the corona discharge electrode, and a conductive rubber with a specific resistance of 500 K to I MQ cm and a wall thickness of about 2 mm is used for discharge. A shield plate surrounding the area other than the opening is formed.

A control electrode portion having a corona flow passage hole with a corona diameter of 0.4 am is provided at the tip of the corona discharger as described above.

Then, while applying a negative voltage of 14 KV to the head of the shield plate, 17 KV was applied to the corona discharge electrode.

At this time, the negative polarity corona current that is accelerated and passes through the control electrode section is generated by using a conventional corona discharger as shown in FIG. This is about 10 times the negative corona current passing through this passage hole when the voltage is the same.

As shown in FIG. 7, by constructing a part of the shield plate 25 made of a resistor such as conductive rubber that surrounds the corona discharge electrode 26 with a transparent conductive material 27 such as Nesa glass that can be used as an electrode, it is possible to It is possible to obtain a corona discharger according to the present invention in which the portion is optically open.

〔effect〕

As described below, the present invention directs a part of the corona flow generated from a needle-shaped, wire-shaped, etc. It becomes possible to concentrate on the department.

Therefore, by combining it with the control electrode section as described in FIG. It also solves the problem.

[Brief explanation of drawings]

Figures 1a and 1 are explanatory diagrams of the electrostatic latent image creation process using a conventional corona discharger, Figure 2 is a cross-sectional perspective view of the electrostatic recording discharger used in Figure 1, Figures 3 and 4 are explanatory diagrams of the principle of corona flow control using the discharger in Figure 2, and Figures 5 and 6 are
FIG. 7 shows a cross-sectional view of a corona discharger according to the invention. In the figure, 1... conductive support, 2...
...Insulating layer, 7... Passing hole, 8... Shield plate, 9... Insulating layer, 10... Control electrode, 16... ...Corona discharge electrode, 1γ...
...Container wall, 18... Spacer, 19...
...Power source, 20... Electrode, 21... Spacer, 22... Corona discharge electrode, 23...
...Power supply, 24...Resistance.

Claims (1)

[Claims] 1. A corona discharge electrode, and an opening surrounding the corona discharge electrode for discharge, applying a voltage to the side remote from the opening, and reducing the voltage drop that occurs through the resistor. A conductive shield plate made of a resistor that forms a potential gradient that concentrates the corona flow from the discharge electrode at the opening, and a discharge opening in the shield plate are arranged to reduce the corona flow. The control electrode part has a passage hole for controlling the passage of the corona discharge electrode, and the corona flow from the corona discharge electrode is concentrated on the passage hole of the control electrode part by means of the potential gradient formed in the shield plate. A corona discharger characterized by controlling. 2. A corona discharge electrode, which has an opening surrounding the corona discharge electrode for discharge, is connected to the bottom of the tank by a plurality of mutually insulated conductive parts, and discharges by applying different voltages to the conductive parts. It has a shield plate that forms a potential gradient that concentrates the corona flow from the electrode at the opening, and a control electrode part that is disposed at the discharge opening of the shield plate and has a passage hole that controls the passage of the corona flow. A corona discharger characterized in that the passage of the corona flow is controlled by concentrating the corona flow from the corona discharge electrode into the passage hole of the control electrode part by means of a potential gradient formed on the shield plate.