JPS62298275A - Image recording device - Google Patents

Abstract

PURPOSE:To make it possible to obtain stable recorded images even when the surface potential of The dielectric layer itself of a developing member by providing the second electrode that moves relatively to the first electrode and providing the third electrode adjoining the first electrode in the toner supply side of the first electrode. CONSTITUTION:When voltage is impressed to the first electrode from a driving circuit 7, charge of different pole is induced to the parent body of a toner chain 5a and the second electrode 3. As the two charges attract each other by coulombic force, the toner chain is cut by movement of the second electrode 3, and a developed image 5b is formed by toner on the second electrode 3, and fixed by a thermal fixing device etc. When a dielectric layer 3b is charged, toner 5c which is in contact with the dielectric layer in the toner deposition side is also charged by induction. Accordingly, when charge of polarity opposite to charged toner 5c is injected by the third electrode 4 placed near the first electrode 2, the toner chain 5a not influenced by charge of the dielectric layer 3b can be formed. Therefore, even when the dielectric layer 3b is charged, a developed image not influenced by it can be obtained.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Industrial Application Field] The present invention relates to an image recording device, and relates to an image recording device in which a special conductive 1 raw magnetic toner is directly applied to the surface of a developing member according to a drowsiness signal. The present invention relates to an image recording device that obtains a developed image using charged toner by charging the toner.

[Conventional technology]

One example of a method for obtaining a recorded image by bringing conductive toner powder into contact with an electrode is disclosed in Japanese Patent Publication No. 55-30228.

JP-A-58-50557, JP-A-60-162660
issue.

There is a method described in JP-A-59-223465. The recording method using conductive toner powder, as typified by the method described above, has many favorable features such as the ability to apply a low voltage to the recording electrode.
No consideration was given to changes in the surface structure of the dielectric layer of the developing member.

[Problem that the invention seeks to solve]

As disclosed in the above-mentioned conventional example, the developed image of the toner on the developing member is transferred by a method in which the toner on the developing member is transferred to recording paper by the action of a strong electric field of a corona discharger and a transfer roller. These transfer means use a strong electric field action, so by drying and drying the recording several times, the current I3!
There was a problem in that the dielectric layer of the member was charged and had a surface potential of about -5 to 5V.

In the recording method in which the toner is directly charged with the recording electrode, the applied voltage for forming the developed image is as low as 30 to 60 V, so the quality of the recorded image is affected by slight changes in the amount of the toner on the surface. There were problems such as staining of the background of the recorded image and, more particularly, a black and white reversed image.

A possible solution to this problem is to use a discharger such as a corona discharger, but the voltage after discharge showed a surface potential of about 5V, and the recorded image quality did not improve.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image recording apparatus that obtains stable recorded images even if the surface potential of the dielectric layer itself of a developing member changes.

[Means for Solving the Problems] The above object is to provide a plurality of independent first electrode means arranged in a row to which a voltage is applied in accordance with a recording signal.

a first electrode having a surface formed by a dielectric layer and acting as a development member and disposed in facing and spaced relation to a first electrode;
a second 11L pole means which is supplied with conductive magnetic toner between the first electrode means and which moves relative to the first electrode means; This is achieved by providing the third electrode means adjacent to the first electrode means on the toner supply side.

[Effect]

When the surface dielectric layer of the second electrode acting as a developing member is charged, toner that has come into contact with the surface dielectric layer on the toner supply side is also charged and adheres to the surface of the dielectric layer. The second electrode moves and the charged electrode 1- comes near the third electrode. The charged toner that has moved to the vicinity of the third electrode means is injected with a reverse electric charge by the third electrode means so that the charge disappears in the vicinity of the first electrode means. The first electrode means to which a voltage corresponding to the recorded image is applied is connected to the second electrode means in the vicinity of the third electrode means.
Because '' is adjacent to the moving side of the kettle means.

The first electrode means is capable of developing the unloaded toner and can obtain a developed image (i-) free from the influence of the surface potential of the second electrode.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention, and is a sectional view of a side surface of a developing section.

The ceramic substrate 1 has a large number of independently existing first electrodes 2 arranged in a row over almost its entire width. A second electrode 3 is arranged facing the first electrode 2 with a gap of about 0.05 to 0.14. This second electrode 3 has a base body 3a formed of a conductive material and a surface having a thickness of 1 to 50 mm.
The dielectric layer 3b has a thickness of approximately μm.

The second electrode moves in the direction indicated by the arrow in the figure. The ceramic substrate 1 is formed into a 113-ring shape with its tip first, and a third electrode is formed at the tip of the ceramic base surface on the side opposite to the movement direction of the second electrode, covering almost the entire width of the ceramic substrate. is set up.

The third electrode is disposed at a distance of preferably 0.2 or less, and at most 11 or less microgear distances from each other at their mutual tips with respect to the first electrode.

The conductive magnetic toner 5 is composed of particles each having a particle diameter of about 5 to 30 μm, and is deposited on the opposite side of the direction of movement of the electrode Ki2 so as to be in contact with the second and third electrodes. The permanent magnet 6 is placed on the base side of the second electrode, and the magnetic field created by the permanent magnet 6 forms a toner chain 5ai between the first electrode 2 and the second electrode 3.

7 applies a voltage corresponding to an image signal to each of a large number of independently existing first electrodes. This is a drive circuit.

Numeral 8 is a variable resistor whose resistance is sufficiently low compared to the toner resistance, and numeral 9 is a direct current trace source. These two constitute a constant voltage d source 10 that generates a positive and negative constant α pressure in the OV range.

With the above configuration, when a voltage is applied to the first electrode from the drive circuit 7, six charges of different polarities are induced in the matrix of the toner chain 5a and the second electrode. Since these two charges attract each other due to Coulomb force, the toner chain is broken by the movement of the second electrode 3, and a toner phenomenon image 5b is formed on the second electrode 3. This developed image is transferred onto recording paper by a normal transfer means (not shown), and further fixed by a heat fixing device or the like.

When the dielectric layer 3b is charged, the toner 5c in contact with the dielectric layer on the toner deposition side is also charged by induction. In the embodiment shown in FIG. 1, the dielectric turtle layer 3b is negatively charged,
In the toner 5C, a positive charge having a polarity opposite to that of the dielectric layer is induced. Conventionally, while the electric charge of the charged toner 5C is preserved, or after contacting the dielectric layer again with the de-electrified iron and the toner 5C being charged again, the first
Since the toner is transported to the electrode, forms the toner chain 5a, and is developed in the first IT operation, the background of the recorded image quality is smudged due to the influence of charging of the dielectric layer.

In the embodiment of the present invention, the third electrode 4 disposed near the first electrode 2 presses charges of opposite polarity to the toner charges into the charged toner 5C. Therefore, dielectric layer 3b
It is possible to use the toner chain 5a without being affected by charging. That is, the third electrode 4 is set to a negative potential with a polarity opposite to that of the charged toner 5C. Therefore, the toner 5d in contact with the third electrode 4 exhibits a negative position. The toner 5e directly below the third electrode and in contact with the guiding layer 3b&''C has a negative charge due to the potential of the third electrode.Furthermore, the toner 5f near the toner 5a forming the toner chain has a negative charge. The injection of charge from the electrode 4 of No. 3 and the charge induced by the surface No. 1 of the dielectric layer 3b are canceled, resulting in a state of no charge.

Therefore, even if the dielectric layer 3b formed on the surface of the second electrode 3 is charged, a developed image that is not affected by this can be obtained.

In the embodiment described above, the first and third electrodes are approximately 0
．． The electrode faces the second electrode at an interval of 1 arm, and the first electrode and the third electrode are arranged at an interval of at most 1 arm.

With such a configuration, the influence of charging of the dielectric layer on the second electric pot can be effectively eliminated.

Note that it is effective to set the surface potential of the third electrode (the voltage to be applied in advance) based on the normal value of the surface potential of the second electrode 3; It is also possible to measure the entire concentration and automatically adjust it, or manually adjust it.

〔Effect of the invention〕

According to the present invention'/c, even if the surface of the second electrode, on which the image to be displayed is formed, is charged, the effect can be canceled and a clear recorded image can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment 11 of the present invention. 1... T ramic board, 2... 1st "a pot, 3...
...Second page 1 Figure

Claims (1)

[Claims] 1. A large number of independent first electrode means arranged in a row to which a voltage is applied in accordance with a recording signal, and a surface formed by a dielectric layer facing and separated from the first electrode means. a second electrode means which is arranged in a direction and moves relative to the first electrode means; In an image recording apparatus comprising a conductive magnetic toner to which a charge is directly injected by an electrode means to form a recorded image on the surface of the second electrode means, the An image recording apparatus characterized in that a third electrode means is provided adjacent to the first electrode means.