JPH0373478B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a discharge printer head used in a discharge printer.

Configuration of conventional examples 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 increasingly being owned by individuals, and lower cost and higher performance printers are desired. There are many types of printers, but among these, discharge printers have several unique features and are expected to be used as printers. The principle of this discharge printer is to use recording paper with a thin layer of aluminum formed on a black sheet, and to generate a discharge between a needle made of metal such as tungsten and the aluminum. This scatters the black of the base color to appear in that area. This method has many advantages, including a simple principle and clear recording. By the way, as shown in FIG. 1, the structure of the head of a conventional discharge printer is such that a tungsten needle 1 made of a thin tungsten wire is embedded in a resin block 2 so that its tip partially protrudes. However, in such a structure, since the tungsten needle 1 is made to protrude, the needle must be thicker than a certain level in order to maintain strength and precision. Usually the thickness of tungsten needle is 0.3
mm size is used. Therefore, there is a limit to reducing the distance between the tips of the tungsten needles. The smaller this distance is, the higher the definition of the recorded characters and images becomes, the more natural the characters and images become, and the higher the recording quality.
However, in the above-mentioned conventional discharge printer, the distance between the needles in the head section was large, causing problems in recording quality. Therefore, in order to solve these problems, it is first necessary to reduce the distance between the needles. Further, in the conventional head for an electric discharge printer, it is necessary to arrange the tungsten needles at equal distances and to draw out the wire for signal supply so that the head can be connected to the flexible wiring board 3, which is difficult to manufacture.

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 tooth shape on one side of an alumina substrate, aligns one end of the thin wire layer with one end of the alumina substrate, To provide a head for a discharge printer 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 EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. In FIG. 2, 4 is an alumina substrate, 5 is a plurality of thin wire layers made of tungsten printed in a comb shape on one side of the alumina substrate 4, and 6 is in the same plane as one end surface of the alumina substrate 4. This is the end of the tungsten wire layer. 7 is a signal input terminal formed at the other end of the thin wire layer 5;
is a flexible wiring board for signal supply.

This discharge printer head 10 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 alumina and tungsten is screen printed to produce an unsintered product with an integrated structure of alumina and tungsten layers, which is then sintered in a mixed gas consisting of nitrogen (N ₂ ) and hydrogen (H ₂ ). . The alumina-tungsten integrated sintered body obtained in this way has excellent mechanical strength because it uses alumina as the 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 Kg/mm ² ).

Next, to explain the operation, in FIG. 3 showing the operating state, 9 is a voltage signal generator for causing discharge, A is a thin sheet for recording whose upper surface is coated with aluminum, and the head 10 for the discharge printer is When the tip is run in the direction of the arrow in contact with the aluminum surface and a current is passed between the tip and the aluminum using the signal sent from the voltage signal generator 9, the aluminum heats up only when the current flows. It scatters, 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 As is clear from the above description, the discharge printer head of the present invention uses a mechanically and chemically stable material called alumina as a substrate, and a fine wire layer of tungsten is formed on the substrate. The structure is extremely strong, and the fabrication process can be carried out in the same way as commonly used processes. No special process is required, so it can be obtained at low cost. Furthermore, the thin wire layer can be easily formed by screen printing, and the thickness of 50 Since it is easy to form thin lines of ~100 μm, it is easy to improve the quality of recording. Furthermore, since it is easy to form a large number of thin wire layers, it is possible to record a large number of layers at once, and the time required for recording can be shortened. Another advantage is that it is extremely easy to implement the driver circuit that sends signals to the head.
In other words, since it is easy to realize a multilayer structure using alumina and tungsten, the tungsten layer is used as a wiring board conductor on an alumina substrate, and the driver circuit is mounted in a multilayer structure with high density to create a printer head-driver type. This makes it possible to achieve many benefits, such as facilitating the miniaturization of equipment.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional example, FIG. 2 is a perspective view of an embodiment of the present invention, and FIG. 3 is a perspective view of the same operating state. 4 is an alumina substrate, 5 is a tungsten thin wire layer,
6 is the end of the tungsten wire layer, and 7 is the signal input terminal.

Claims (1)

[Claims] 1 A discharge in which multiple fine wire layers made of tungsten are printed in a comb-like shape on one side of an alumina substrate, one end of the fine wire layers is aligned with one end of the alumina substrate, and a signal input terminal is formed on the other end of the fine wire layer. Printer head.