JPH0645250B2 - Electrostatic latent image writing electrode - Google Patents

Description

The present invention relates to a latent image writing electrode for electrostatic recording, which is non-contact with a recording medium, has a low control voltage, enables halftone recording, and has a high recording speed.

FIG. 1 is a sectional view showing an example of a conventional technique, in which 1 is an insulating substrate, 2 is a control electrode, and an upper control electrode 2 is shown.
a and the lower control electrode 2b. 3 is the control electrode 2
And an ion flow control hole provided through the insulating substrate 1.

Conventionally, in this type of electrode, a large number of control electrodes 2 are directly adjacent to each other as shown in FIG. 1, so that electric fields above and below the control electrodes 2 are applied to the adjacent control electrodes 2. There is a drawback that the voltage is interfered with and the flow of ions passing through the ion flow control hole 3 of the control electrode 2 is easily affected.

In order to eliminate these drawbacks, the present invention provides a new auxiliary electrode in the middle of adjacent control electrodes to give a predetermined potential to prevent mutual interference of electric fields above and below the control electrodes. . Hereinafter, the present invention will be described in detail with reference to the drawings.

2 and 3 are a sectional view and a plan view showing an embodiment of the present invention, in which 4 is an auxiliary electrode to which a predetermined potential is applied, and the others 1 to 3 are shown in FIG. Is the same as.

In order to operate this, the control electrode 2 is used by varying each potential to turn on and off the ion flow, but the auxiliary electrode 4 is always kept at a constant potential as an example. Since the auxiliary electrode 4 is kept at a constant potential, the electric fields above and below the auxiliary electrode 4 are less likely to fluctuate, and as a result, the electric fields above and below the control electrode 2 adjacent to the auxiliary electrode 4 are mutually different. The interference is less likely to occur, and as a result, the flow of ions passing through the ion flow control hole 3 of the control electrode 2 can be prevented from being affected by the potential of the adjacent control electrode 2.

This embodiment is an example in which the auxiliary electrodes 4 are provided on both surfaces of the insulating substrate 1, but the auxiliary electrodes 4 may be provided on the insulating substrate 1 as necessary.
It may be installed only on the upper surface or the lower surface.

FIG. 4 is a plan view showing another embodiment of the present invention. When the control electrodes 2 are arranged two-dimensionally as shown in FIG. 4, the auxiliary electrodes 4 are also two-dimensionally arranged as shown in FIG.
It is effective to place them so that they are cut in between.

Further, as shown in FIG. 4, the auxiliary electrode 4 is formed so as to cover the surface of the insulating substrate 1 other than the control electrode 2 as much as possible.
By installing, there is also an effect that a change in the electric field due to a potential increase on the surface of the insulator substrate 1 when the surface of the insulator substrate 1 is irradiated with an ion stream can be suppressed to a low level.

FIG. 5 is a plan view showing still another embodiment of the present invention. In the case of the control electrode 2 of the type in which a plurality of ion flow control holes 3 are collectively controlled as shown in FIG. 5, a group of control electrodes 2 which are simultaneously driven to the same potential are isolated from each other, and the auxiliary electrode 4 is formed. By installing, it is possible to prevent interference between the control electrodes 2.

In the above embodiment, the case where a constant potential is always applied to the auxiliary electrode 4 arranged between the control electrodes 2 is shown. However, in the configuration as shown in FIG. It is also possible to apply a voltage pulse of polarity to the surrounding auxiliary electrode 4 to suppress the influence of the write voltage.

FIG. 7 shows an example of the voltage waveform in the above case,
A is a voltage pulse applied to the control electrode 2, and B is
Is a pulse of opposite polarity applied to the auxiliary electrode 4.
The control electrode 2 and the auxiliary electrode 4 are both kept at the same potential, for example, 1 kV, except during writing.

When a constant potential is applied to the auxiliary electrode 4 as described above, when the voltage of a large number of control electrodes 2 in the same region changes in the same direction, the electric field between the corona wire and the control electrode 2 surface changes significantly, The drawback that the generation of corona ions is changed can be improved.

As described above, according to the present invention, since the auxiliary electrode is installed to control the change in the electric field around the control electrode, the ion current passing through the control electrode is less likely to be disturbed or interfered with by the surroundings, and Further, there is an advantage that the change of the electric field due to the potential increase on the surface of the insulating substrate when irradiated with the corona ion flow can be suppressed to a low level.

[Brief description of drawings]

FIG. 1 is a sectional view of a writing electrode in a conventional writing device of this type, FIG. 2 is a sectional view showing an embodiment of the present invention, and FIG. 3 is a plan view showing another embodiment of the present invention.
FIG. 5 is a plan view showing still another embodiment of the present invention,
FIG. 6 and FIG. 6 are plan views showing still another embodiment of the present invention, and FIG. 7 is a waveform diagram showing an example of voltage applied to the control electrode and the auxiliary electrode. In the figure, 1 is an insulator substrate, 2 is a control electrode, 3 is an ion flow control hole, and 4 is an auxiliary electrode.

Claims (5)

[Claims] 1. An electrode for writing an electrostatic latent image by controlling an electric potential for applying a corona ion flow to each of a plurality of control electrodes, around the respective control electrodes formed on an insulating substrate, or each of the control electrodes. An electrostatic latent image writing electrode, characterized in that an auxiliary electrode for applying a potential that suppresses a change in the surrounding electric field is provided between the electrodes. 2. The auxiliary electrode is a large number of electrodes, which are arranged in the same number or more as the number of the gaps, at positions where the adjacent gaps between the individual control electrodes are blocked. The electrostatic latent image writing electrode according to the item (1). 3. The auxiliary electrode is a large number of electrodes arranged in the same number as or more than the number of the auxiliary electrodes at positions individually surrounding the periphery of each control electrode. The electrostatic latent image writing electrode according to the item 1). 4. The auxiliary electrode is one electrode or a number of electrodes equal to or less than the number of the gaps arranged at a position to fill the gap of each control electrode.
The electrostatic latent image writing electrode according to the item. 5. As a potential applied to the auxiliary electrode, a voltage pulse having a polarity opposite to that of a voltage pulse applied to a control electrode surrounded by each auxiliary electrode is set to a constant potential and a voltage pulse applied to the control electrode. The electrostatic latent image writing electrode according to claim (3), wherein the electrodes are simultaneously overlapped.