JPH0569584A - Aperture electrode body - Google Patents

Abstract

PURPOSE:To obtain an aperture electrode body preventing a toner path from the aperture electrode body to a substrate from being affected by an electric field of a control electrode. CONSTITUTION:A high-voltage electrode 7 and a back electrode 11 make a toner fly electric field uniform. Therefore, there is no possibility that a path of a toner 22 through an aperture 6 may be deflected by being affected by an electric field of a control electrode for an adjacent non-image part. The toner 22 adheres to a predetermined position on a substrate 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a copying machine, a printer,
The present invention relates to an aperture electrode body used in an image forming apparatus that can be used in plotters, facsimiles, and the like.

[0002]

2. Description of the Related Art An image recording apparatus for obtaining an image on a support by controlling the passage of toner particles through an aperture by applying an image signal to an electrode having an aperture has been proposed in US Pat. No. 3,689,935. ing. This proposal is composed of a reference electrode that is continuous on one side with an insulator layer sandwiched between it and a plurality of control electrodes that are insulated from each other on the other side. Also, an aperture electrode body having a row of apertures, a means for selectively applying a potential to the control electrode between the reference electrode and the applied potential so that the flow of toner particles through the aperture is modulated. It comprises means for projecting charged particles and means for positioning the support in the particle flow path by the relative movement of the support and the aperture electrode body.

[0003]

However, when the voltage of the adjacent control electrodes is different between the image area and the non-image area, the toner passing through the aperture is affected by the electric field by the control electrode in the non-image area. Therefore, the path from the aperture electrode body to the support body is bent, and it does not adhere to a predetermined position on the support body.

Therefore, an accurate image output cannot be obtained.

The present invention has been made to solve the above-mentioned problems, and provides an aperture electrode body in which the path of toner from the aperture electrode body to the support is not affected by the electric field from the control electrode. It is an object.

[0006]

In order to achieve this object, the aperture electrode body of the present invention comprises a reference electrode serving as a reference of an electric field of a first layer, an insulating layer of a second layer, and a third electrode. A control electrode for controlling the electric field of the layer, a fourth insulating layer, a high-voltage electrode for producing a uniform electric field on the surface of the fifth layer, and a control electrode provided substantially at the center of the control electrode, and And an opening penetrating the five-layer substrate.

[0007]

According to the present invention having the above structure, the high voltage electrode forms a uniform electric field on the surface of the aperture electrode body on the support side.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an image forming apparatus 100 according to an embodiment of the present invention. As shown in detail in FIG. 2, the aperture electrode body 1 is sandwiched between the reference electrode 3 on the toner supply source side of the insulating layer 2 and the high voltage electrode 7 and the insulating layers 2 and 5 on the support side of the insulating layer 5. A large number of apertures 6 each having the control electrode 4 and penetrating the reference electrode 3, the insulating layer 2, the control electrode 4, the insulating layer 5, and the high-voltage electrode 7 are formed in a row in the width of the support. In FIG. 1, on the left side of the image forming apparatus 100, a cassette 50 for accommodating the support body 10, a half-moon roller 51 for supplying the support body 10 one by one, and a support body 10 for the downstream portion.
A support supply roller 52 and a chute 53 for feeding the paper are arranged.

On the downstream side, on the high voltage electrode side of the aperture electrode body 1, there is provided a support carrier roller 14, a sensor 57, and a back electrode 11 in contact with the back surface of the support 10, and each control electrode 4 is provided. Each of them is connected to a control voltage drive circuit 9 that generates a voltage according to an image signal. The high-voltage electrode 7 is a negative high-voltage power supply 8, and the back electrode 11 is a negative high-voltage power supply 12.
Connected to.

On the side of the reference electrode of the aperture electrode body 1, a toner carrying belt 26 is wound between the driving roller 20 and the backup roller 24, and on the back side of the surface of the carrying belt facing the aperture electrode body, a cam roller having an elliptical cross section. Two
7, the static elimination brush 37 is arranged on the upstream side thereof.
These are the toner 2 accumulated near the supply roller 23.
2 and the toner feeding belt 26 in contact with the supply roller 23
It is housed in the toner case 21 together with a carrying roller 30 having a clearance of 0.1 to 0.4 mm. The supply roller 23 is a support roller 30 such as a sponge.
Has a surface formed of resin.

Further downstream, the fixing device 13 and the chute 5
4, a discharge roller 55, and a tray 56 are arranged.

The operation of the above structure will be described in detail below.

The support 10 housed in the cassette 50 is
Half moon roller 51 feeds out one by one and shoots 5
3 is guided by the supporting member feeding roller 52 and is conveyed to the supporting member conveying roller 14. When the tip of the support 10 is detected by the sensor 57, the toner transport belt 26 rotates between the backup roller 24 and the drive roller 20 by the rotation of the drive roller 20 in the arrow direction, and the toner 22 is rotated by the rotation of the supply roller 23 in the arrow direction. Is rubbed against the carrying roller 30 to be positively triboelectrically charged, and then carried on the toner carrying belt 26 by electrostatic coating with a high voltage power source.

The carried toner is transported toward the surface facing the aperture electrode, but the transport belt 26 is discharged from the back side of the transport belt 26 on the upstream side of this position by the static elimination brush 37. Since the cam roller 27 is rotating at the position of the surface facing the aperture electrode, the surface of the conveyor belt 26 vibrates. Therefore, the toner carried on the conveyor belt 26 receives a force due to the vibration acceleration of the conveyor belt 26, and is released from the image force, the van der Waals force, and the adhesion force such as the electrostatic force with the conveyor belt 26.

On the other hand, at this time, if a negative voltage is applied to the control electrode 4 in accordance with an image signal from a storage means (not shown),
In the aperture 6 of the applied control electrode 4, electric lines of force are formed from the back surface of the aperture 6 to the front surface thereof, and the toner 22 that is positively charged is drawn from the back surface of the aperture 6 to the front surface, and further, High voltage electrode 7, back electrode 11
The flying electric field generated by the above causes the particles to fly onto the support 10 and be held to form an image portion.

At this time, for example, -200 is applied to the high voltage electrode 7.
Since the volt and the rear electrode 11 are applied with −1 kilovolt and the flying electric field is uniform, the toner 22 exiting the aperture 6 is influenced by the electric field by the control electrode 4 in the non-image area adjacent to the toner 22 Does not bend, but adheres to a predetermined position on the support 10.

By applying the same potential or positive voltage as the reference electrode 3 to the control electrode 4 of the aperture 6 corresponding to the non-image area, the flying electric field by the high voltage electrode 7 and the back electrode 11 is shielded or the aperture 6 is opened. By forming an electric force line from the control electrode 4 toward the reference electrode 3 on the back surface, the passage of the toner 22 through the aperture 6 is suppressed. By repeating this process while transporting the support 10, a toner image is formed on the entire surface of the support 10.

The support on which the toner image is formed is the fixing device 1.
After passing through 3, the image is fixed on the support 10. Further, the tray 5 is guided by the chute 54 and is discharged by the discharge roller 55.
It is discharged to 6.

Further, the present invention is not limited to the above embodiment and can be modified within a range not departing from the gist thereof.

[0021]

As is clear from the above description,
According to the present invention, since the flying electric field of the toner from the aperture electrode body to the back electrode can be made uniform, it is possible that the toner leaving the aperture is bent by the influence of the electric field by the control electrode in the non-image area adjacent to the toner. Nothing happens, and an accurate output image can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment embodying the present invention.

FIG. 2 is a perspective view showing details of an aperture electrode body.

[Explanation of symbols]

 1 Aperture electrode body 2 Insulating layer 3 Reference electrode 4 Control electrode 5 Insulating layer 6 Aperture 7 High voltage electrode

Claims (1)

[Claims] 1. In an aperture electrode body used in an image forming apparatus such as a copying machine, a reference electrode serving as a reference of an electric field of a first layer, an insulating layer of a second layer, and an electric field of a third layer. A control electrode for controlling, a fourth insulating layer, a high-voltage electrode that creates a uniform electric field on the surface of the fifth layer, and a substrate of the fifth layer, which is provided substantially at the center of the control electrode. And an opening penetrating the aperture electrode body.