JPS59111869A - Head for electric discharge printer - Google Patents

Abstract

PURPOSE:To obtain the titled head making high quality recording possible, by a method wherein the plural tungsten fine lines layer of comb teeth state is, in a printing manner, formed on one side surface of alumina substrate, one end thereof being coincided with one end of abovementioned substrate and a signal terminal is formed at another end thereof. CONSTITUTION:The tungsten paste composed of tungsten powder and vehicle is, in a screen manner, printed on the unsintered sheet composed of alumina powder and the like and the aluminatungsten layer monolithic sintered body is obtained by sintering it in the mixed gas of nitrogen and hydrogen. The plural fine wires layer 5 composed of tungsten, formed in a comb teeth state with printing on one side surface of this alumina substrate 4, is formed. The symbol 6 means the end part of tungsten fine wires layer existing on the same surface as one end surface of alumina substrate 4, the signal input terminal 7 being formed at another end of abovementioned fine wires layer 5, the flexible distributing sheet 8 for supply of signal being provided and the required head for a discharge printer where the distance between fine wire layers is reduced, is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a concentric printer head used in a discharge printer.

Conventional configurations and their problems In recent years, with the development of information equipment, the importance of information output devices has increased, and printers as output devices are also one of the important devices. Nowadays, unlike in the past, information devices are being owned by individuals, and printers are also desired to have lower cost and higher performance. There are many types of printers, but among these, discharge printers have several indispensable features and are expected to be used as printers. The principle of this discharge printer is to use a thin layer of aluminum formed on a black sheet as the marking paper, and to generate a discharge between a metal needle such as tungsten and the aluminum, and to It scatters aluminum so that the black base appears in that area. This method is characterized by its simple principle, clear records, and many other advantages. By the way, the structure of the head of a conventional discharge printer, as shown in Fig. 1, is a tungsten needle (1) made of a thin tungsten wire embedded in the head so that its tip partially protrudes. . However, in such a structure, since the tungsten needle (1) protrudes, it is necessary to make the needle thicker than a certain level in order to maintain strength and precision. Usually, a tungsten needle with a thickness of approximately U is used.

Therefore, it is natural to reduce the distance between the tips of the tungsten needles, improving the quality of recording. LJ-R
In the above conventional discharge printer, the distance between the needles in the head section was large, resulting in an open chain in the deployment quality. Therefore, in order to solve these problems, it is first necessary to reduce the distance # between the needles. In addition, with conventional discharge printer heads, there were manufacturing difficulties, such as the need to arrange the tungsten needles at equal distances and to draw out the signal supply wire so that it could be connected to the flexible wiring board (3). .

OBJECTS OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a head for an electric discharge printer that has a simple structure and enables high-quality recording.

Structure of the Invention In order to achieve this object, the present invention prints a plurality of thin wire layers made of tungsten in a comb-like shape on one side of an alumina substrate, and aligns one end of the thin wire layer with one end of the alumina substrate. To provide a discharge printer head in which a signal input terminal is formed at the other end of the thin wire layer, and the distance between the thin wire layers is reduced by printing the tungsten thin wire layer.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. In Figure 2, G4) is an alumina substrate, ((
) is a plurality of thin wire layers made of tungsten printed in a comb-like shape on one side of this alumina substrate (4),
6) is the end of the tungsten thin wire layer located in the same plane as one end surface of the alumina substrate (4). (7) is the fine line layer (5)
A signal input terminal (8) formed at the other end is a flexible wiring board for signal supply.

This discharge printer head αO is manufactured through the following steps. First, tungsten powder and a vehicle (an organic binder dissolved in a solvent) are placed on an unsintered sheet (generally called a green sheet) consisting of alumina powder, sintering aid, fixed-term binder, and plasticizer. A tungsten paste consisting of a tungsten paste is screen printed to produce an unsintered product having an integral structure of alumina and tungsten layers, and then this is sintered in a mixed gas of nitrogen (N2) and hydrogen (N2).

The alumina-tungsten integrated sintered body obtained in this way has excellent mechanical strength because it uses alumina as a substrate, and since the tungsten is sintered at the same time as the alumina, the tungsten layer is the same as the tungsten wire. The adhesive strength between alumina and tungsten is extremely high (> 6 Kq7.74).

Next, to explain the operation, in Figure I3 showing the operating state, (9 is a voltage signal generation section for causing discharge, (A
) is a thin recording sheet whose upper surface is coated with aluminum.The tip of Herad 01 for discharge printers is run in the direction of the arrow in contact with the aluminum surface, and this is detected by the signal sent from the voltage signal generator (■). When a current is passed between the tip and the aluminum, the aluminum is blown away by the heat only when the current flows, exposing the black part that forms the base of the aluminum. As a result, the black part remains as a record.

Effects of the Invention According to the discharge printer head of the present invention, as is clear from the above explanation, the substrate is made of alumina, which is mechanically and chemically stable, and a fine wire layer of tungsten is formed on the substrate. The structure is extremely strong, and it is also easy to work with.
It can be carried out in the same way as a commonly used process and requires no special process, so it can be obtained at low cost.Furthermore, the fine wire layer can be easily formed by screen printing and has a thickness of 50 to 100 μm.
Since it is easy to form a thin line of m, it is easy to improve the recording quality. In addition, since it is easy to form a large number of thin wire layers, it is possible to record a large number of wires at once, and the time required for recording can be shortened. Another advantage is that it is extremely easy to implement.

That is, since it is easy to realize a multilayer structure in the alumina and tungsten system, tungsten 11 is used as a wiring board groove and body using an alumina substrate, and the driver circuit is mounted in a multilayer structure with high density. It is also possible to have an integrated driver, which provides many benefits such as making it easier to downsize the device.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional example, FIG. 2 is a perspective view of an embodiment of the great invention, and FIG. 3 is a perspective view 1 of the same operating state. (4) is an alumina substrate, 6) is a tungsten thin wire layer, (
6) is the end of the tungsten wire layer, and C7) is the signal input terminal. Patent applicant agent figure 1

Claims (1)

[Claims] A discharge printer that prints multiple thin wire layers made of tungsten in a comb-like shape on one side of an alumina substrate, aligns one end of the thin wire layers with one end of the alumina substrate, and forms a signal input terminal on the other end of the thin wire layer. Head for.