JPS627064A - Solid discharging device - Google Patents

Abstract

PURPOSE:To remove the unevenness of electric discharge even when a part of DC applying electrode is disconnected by using an annular electrode forming a closed circuit obtained by coupling parallel filaments parallel with a pair of AC applying electrodes at both the end parts as the DC applying electrode. CONSTITUTION:A pair of AC applying electrodes 1, 2 are buried in a dielectric layer 4 with a gap which can almost interrupt electric discharge and the DC applying electrode 3a insulated from the electrodes 1, 2 as DC and forming a closed circuit as capacity is formed on the surface of the layer 4. The electrode 3a is constituted of parallel wires 3a-1, 3a-2 opposed to the electrodes 1, 2 and wires 3a-3, 3a-4 connecting both the ends of the 3a-1, 3a-2 as a rectangular annular electrode and one wire 3a-3 is connected to the DC applying contact 7 at its center position A. Even if a part of the electrode 3a is disconnected, unevenness of discharge can be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a solid-state v:, i device used in a charge removal device for a photoreceptor, etc. of an electrostatic recording device.

Prior Art A solid-state discharge device (solid-state Wl
Device go d 5tate charger: U after S
The SC (SC) is being put into practical use because it is superior in terms of high reliability, high serviceability, small size, and high-speed response.

Various proposals have been made regarding the structure of an SSC that performs corona discharge to de-charge a charged surface such as a photoconductor, but one of the inventors of the present invention first proposed a method for improving the withstand voltage characteristics and for applying a charge. We have proposed an SSC having a configuration as illustrated in FIGS. 4 and 5 because of the advantage that the uniformity of electric strength is not easily impaired even if the frequency of alternating current is reduced. FIG. 4 is a sectional view thereof, and FIG. 5 is a plan view seen from the discharge side.

This 5SC 40 includes a pair of AC applying at poles 1 and 2 disposed within the dielectric layer 4 with an interval that prevents discharge.
The electrode pair l is provided on the surface of the dielectric layer 4.

It has a direct current applying electrode 3 disposed opposite to 2. When an AC voltage is applied between the AC applying 1fJ electrodes 1 and 2 by the AC power supply 11, the AC current flows from the 10,000 AC applying electrodes to the other side via the dielectric layer 4, the DC applying electrode 3, and the dielectric layer 4. The current flows to the AC applying electrode 1, and at that time, the DC applying electrode 1
A corona discharge occurs between the edge of the dielectric layer 4 and the surface of the dielectric layer 4 in contact with this portion, and + and - ions are generated. SS
When C40 is used to remove static electricity from a surface to be charged such as a photoreceptor, the SSC is arranged so that its discharge surface faces the surface to be charged 12 with a certain gap, and the DC applying electrode 3 is connected to the surface to be charged. Charging surface] If a DC bias power supply 13 is connected between the electrode 2 and a DC electric field is formed between the DC applying electrode 3 and the charged surface 12, the ions generated by the above corona discharge will be charged. A charging current flows toward the charged electrode toward the surface 12, and the charged surface is destaticized.

For example, as shown in FIG. 5, the DC applying electrode 3 is provided on a track parallel to the position facing the AC applying electrode 1.2, and is connected to the wires 3d-1 and 3d-2. A comb-shaped electrode 3d is formed by a filament 3d-3 that is connected at the end thereof and connected to the DC power supply connection terminal 7. In the case of such a comb-shaped DC applying electrode 3d, if a part of it is broken due to damage etc., discharge may occur depending on the degree of breakage, but the DC power supply connection terminal can be connected from the broken part. Since no DC voltage is applied to the portion on the opposite side, the charged surface facing that portion is no longer charged.

One of the inventors of the present invention also proposed a mesh-like electrode consisting of a rectangular frame-shaped filament and a number of filaments arranged diagonally in parallel inside the rectangular frame-shaped filament, as shown in FIG. We proposed an SSC with 3e. In the case of this electrode, even if some of the filaments constituting the electrode are disconnected, it will not affect the discharge and charging, but if the pitch of the diagonal lines is coarse, striped charging unevenness will occur depending on the pitch. If the diagonal lines are too close together, the electric fields will cancel each other out and the discharge will not occur, so it is possible to completely eliminate uneven discharge. It was difficult to do so.

Purpose: In view of the above-mentioned drawbacks of the conventional SSC having the above configuration, the present invention provides an SSC having an AC applying electrode embedded in the dielectric 1 and a DC applying electrode provided on the surface of the dielectric. An SSC that does not affect the discharge and charging of the charged surface even if a part of the charging electrode is disconnected, and does not cause the uneven charge removal that is seen in mesh-like electrodes made of diagonal wire groups. The purpose is to provide and.

Structure In order to achieve the above object, the present invention has the above-mentioned structure S.
In the SC, the DC applying electrode includes a plurality of parallel filaments provided in parallel to the AC applying electrode pair, and a filament connecting the ends on the same side and connected to the DC power supply connection terminal. A filament connecting at least two terminals of the parallel filament at the opposite end, and any part thereof! ! ' It is configured to form part of the RM1 circuit.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In each of the actual IM examples shown in FIGS. 1 to 3, as in the conventional SSC shown in FIG. A DC applying electrode 3 is provided on the surface of the dielectric layer 4 so as to be insulated from the AC applying electrode #i in terms of DC and forming a closed circuit in terms of capacitance. A pair of AC applying electrodes 1.2 and a DC applying electrode 3 are connected to AC connecting terminals 5 arranged at appropriate intervals at the ends of the SSC.
6 and a DC connection terminal 7 are connected to each other.

Direct current application electrode 3a of 5SCIO of the embodiment shown in FIG.
A rectangular frame shape is formed by two parallel filaments 3a-1 and 33-2 provided opposite to the AC applying electrode 1.2 and filaments 383*3a-4 connecting both ends of the two parallel filaments 3a-1 and 33-2. It is configured as a ring-shaped electrode, and the filament 3a-3 at one end is connected to the direct current applying contact 7 at a point A in the center thereof.

Therefore, even if part of the electrode 3a is disconnected due to defects during electrode manufacturing or damage during device operation, the electrode 3a
Since conduction with the terminal 7 can be obtained at any part of the electrode 7, not only the discharge but also the charging of a surface to be charged is not affected.

However, since discharge and voltage application are not performed only in the disconnected portion, uneven charging may occur. That is, the first
In the figure, for example, if a part of the filament 3a-1 on the AC applying electrode l of the DC applying electrode 3a is disconnected, the discharge by the filament 3a-2 on the AC applying electrode 2 will sufficiently eliminate charging unevenness. It is also possible that no correction is made.

The embodiment shown in FIG. 2 takes the above into consideration, and uses m-electrodes 1 and 2 for applying AC as the electrode 3 for applying DC.
A ring-shaped electrode 3b is provided, in which two wires are arranged in a rail shape on each of the wires, and both ends thereof are connected to form a closed loop, and they are connected at one end and connected to the DC power supply terminal 7 at point A. are doing. With such a configuration, for example, the electrode 3
Even if a part of one of the parallel filaments 3b-1 of b is broken, when scanning is performed in a direction perpendicular to the longitudinal direction of the charged surface 5sc2o, the other three parallel filaments 3b-2, ,3b-3,3
By b-4, ha! Charging unevenness can be completely corrected. Furthermore, there are two closed loops t! Since wire breakage is allowed at two locations, one on each of the parallel wire portions of 3b, the reliability of the SSC is improved.

Furthermore, in the embodiment shown in FIG. 3, the two annular electrodes of the embodiment shown in FIG. 2 are connected at both ends.
* Even if three wires out of 3 c 3 + 3 c -4 are broken, discharging and charging are possible.

In each of the above embodiments, the DC applying electrode is composed of a group of parallel wires parallel to the AC applying electrode, so that the discharge unevenness observed in the SSC having a mesh-like electrode in which the wires are arranged in an oblique direction can be avoided. It can be resolved.

Effects As described above, according to the present invention, both DC applying electrodes are made into annular electrodes forming a closed circuit in which parallel wires parallel to the AC applying electrode pair are connected at both ends. The situation where the discharge stops is avoided, and reliability is improved.

[Brief explanation of drawings]

1 to 3 are plan views of the discharge surface of solid-state discharge devices according to embodiments of the present invention, FIG. 4 is a schematic diagram showing the configuration of a solid-state discharge device to which the present invention is applied, and FIG. 5 and FIG. 6 are plan views looking at the discharge surface of examples of conventionally proposed solid state discharge devices, respectively. 1.2...m-electrode for AC application, 3*3a, 3b*3c='electrode for direct current application, 4...dielectric layer, 5.6.7...terminal for power supply connection,

Claims (1)

[Claims] A pair of alternating current applying electrodes are buried in the dielectric layer at a distance that prevents discharge, and a closed circuit is formed on the surface of the dielectric layer, which is insulated from the alternating current applying electrodes in terms of direct current and capacitively. In a solid state discharge device having a direct current applying electrode arranged so as to form a Any part is annular by a filament that connects the side ends and connects to the DC power supply connection terminal, and a filament that connects at least two of the parallel filaments at the opposite end. A solid state discharge device characterized in that it is configured to form part of a closed circuit.