JPS6150177A - Electrode for electrographic recording and its production - Google Patents

Abstract

PURPOSE:To obtain a high-precision and high-capacity neelde-shaped electrode by using an amorphous metal having high magnetic permeability as material of the needle-shaped electrode and sicking a foil of this metal into an insulating substrate and working it to a needle shape by etching thereafter. CONSTITUTION:An amorphous metal foil 8 is stuck onto an insulating substrate 7 consisting of glass, ceramics, or the like. Needle-shaped electrodes 8' having prescribed width are formed by photoetching, and both end parts of individual electrodes are exposed, and the other parts are covered with an insulating material 9 in this state. By this easy process, needle-shaped electrodes are produced. When a signal voltage is applied to a needle-shaped electrode 3 in a recorder, a partial toner 5 is electrified by charging through an insulating recording member 2. That is, the toner is attracted to the side of a rear electrode 1 by the electrostatic force. When this electrostatic force FE acting upon this toner overcomes a magnetic force FM, the toner is separated from the needle-shaped electrode 3 and is held on the recording member 2 to form a toner image.

Description

TECHNICAL FIELD The present invention relates to an electrode for electrographic recording and a method for manufacturing the same.

(Prior Art) Electronic graphic recording systems are known, for example, as disclosed in U.S. Pat.
16,840, etc., and FIG. 1 shows its basic principle. In FIG.

1 is a back electrode with an insulating recording member 2 provided on its surface;
A plurality of needle electrodes 3 are arranged, for example, in a direction perpendicular to the paper surface. 4 is a permanent magnet, and 5 is a toner having magnetic attraction and conductivity. The toner 5 is held between the tip of the needle electrode 3 and the back electrode 1 by the magnetic force of the permanent magnet 4 .

Now, in this state, when a signal voltage is applied to the needle-like electrode 3, the toner is charged via the insulating recording member 2, and a part of the toner is charged. That is, the toner is attracted to the back electrode 1 side by electrostatic force. If the electrostatic force FE acting on the toner is larger than the magnetic forces F and A, the toner leaves the acicular electrode 3 and is held on the recording member 2. In this way, a toner image is formed on the recording member 2.

Incidentally, the needle electrode 3 needs to have conductivity, high magnetic permeability, and appropriate saturation magnetization characteristics. A material suitable for this purpose is permalloy (Fe-
Ni alloy), Alperm (Fe-AN alloy), Sendust (Fe-Si-A2 alloy), silicon steel (Fe-5
In addition, in this recording method, from a practical standpoint, the electrode density must be about 8 to 16 per mm, and the electrode diameter must therefore be 60 to 30 μm. Therefore, as a method for producing needle-shaped electrodes, the above-mentioned material is made into thin wires by punching or rolled into thin strips, and then placed on an insulating substrate such as glass or ceramic.
In the case of thin wires, the electrodes are pasted in parallel and at equal intervals, and in the case of thin strips, the electrodes are pasted on a substrate and then etched or otherwise processed to form electrodes in parallel and at equal intervals.

Another method is to form a film of the above material on a substrate by vacuum evaporation or sputtering, and then etching the film to form an electrode.

However, in order to make the material into thin wires or thin strips, a considerably large number of punching or rolling operations are required, and the process is also complicated. Furthermore, in the case of thin wires, it is difficult to line them up in parallel and stick them together, which increases manufacturing costs. Also, when considering the case of forming a 30 to 60 μm film by vapor deposition or sputtering, if the material is an alloy such as permalloy, the composition may change with vacuum vapor deposition, and sputtering is less efficient in terms of film growth rate. Not.

(Objective of the Invention) The present invention has been made in order to solve the various problems of the conventional art described above, and provides an optimal material for an electrode for electrographic recording and a manufacturing method that is simple, easy, and has high precision. It is something.

(Structure of the Invention) In order to achieve the above object, an amorphous metal with high magnetic permeability is used as a material for the needle-shaped electrode, and after the foil is adhered to an insulating substrate, it is processed into a needle shape by etching. Examples will be described in detail below.

(Example) The needle-shaped electrode must have high magnetic permeability in order to efficiently pass the magnetic flux from the permanent magnet. In addition, it is necessary to have a high saturation magnetic flux density so that the toner can be held between the electrodes without external influences.

The table lists Senges 1- as a material with the above-mentioned required properties.
An example of a unidirectional silicon steel and an amorphous metal according to the present invention is Fe80-820 (known),
The maximum permeability μmaX and saturation magnetic flux density Bs are compared.

As is clear from this table, amorphous metal (F
It can be seen that e80-B20) has high μmax and Bs, and is optimal as a material for needle-shaped electrodes.

In addition, amorphous metal has a 20 to 5
It is characteristic that it can be obtained as a thin strip with a thickness of 0 μm, so when such a thin strip is used, there is no need for rolling.
In this respect, it is extremely advantageous compared to conventional methods that require rolling, since it can be simply attached to an insulating substrate. The method for manufacturing the needle electrode will be described below.

FIG. 2 shows an embodiment of the manufacturing method of the present invention, where 7 is an insulating substrate made of glass, ceramic, etc. First, on the substrate 7, as shown in FIG. 2(a), Amorphous metal foil 8 is pasted on.

Next, as shown in FIG. 2(b), acicular electrodes 8' of a predetermined width are formed by photo-etching, and then, with both tips of each electrode exposed, the other parts are covered with an insulating material 9. Cover with

As described above, a needle-like electrode can be manufactured through a simple process, and the necessary precision can be achieved sufficiently. In addition to the above-mentioned excellent properties, amorphous metal is also characterized by higher hardness than normal fully flexural materials, which is also advantageous for electrodes that are in constant contact with toner.

(Effects of the Invention) As explained above, according to the present invention, an optimal material is used as an electrode for electrographic recording, and it can be manufactured with high precision through a simple process, and a high-performance needle-shaped electrode can be used. can be provided at a low price.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the basic principle of an electronic graphic recording method, and FIG. 2 is a diagram showing a manufacturing method according to an embodiment of the present invention. 1... Back electrode, 2... Recording member, 3...
・Acicular electrode, 4... Permanent magnet, 5... Toner, 7... Insulating substrate, 9... Insulating material 6 first
Figure 2

Claims (2)

[Claims] (1) A first electrode having a recording member on its surface and a needle-shaped second electrode having a magnetic generation source are arranged such that the tip of the second electrode faces the recording member with a predetermined gap therebetween. The electrographic recording device forms a toner image on the recording member using magnetic and conductive toner, characterized in that the needle-shaped second electrode is made of a high magnetic permeability amorphous metal. Electrode for electronic graphic recording. (2) A step of adhering a high magnetic permeability amorphous metal foil to one main surface of an insulating substrate, and a step of etching the amorphous metal foil into a desired needle-like pattern to form a plurality of aligned needle-like electrodes. 1. A method for manufacturing an electrode for electrographic recording, comprising the steps of: covering the formed needle-shaped electrode except for both tips thereof with an insulating material.