JPH01101168A - Manufacture of recording head - Google Patents

Abstract

PURPOSE:To prepare a multilayer recording electrode with high accuracy, by preparing more than one green ceramic sheets, screen-printing electrode material containing paste on necessary portions of each sheet, and laminating and baking the sheets by pressing and heating. CONSTITUTION:A substrate green sheet 1, middle layer green sheet 3a and overcoat green sheet 4 are made of green ceramics. To form a first layer recording electrode 21 pattern on the green sheet 1 and a second layer recording electrode 22 pattern on the green sheet 3a, tungsten paste is applied by means of screen printing. The electrodes 21 and electrodes 22 are printed shifted from each other, e.g., in zigzag. The three green sheets are laminated with an insulating layer between the electrodes, pressed and heated in a reduction atmosphere to bake electrode material and substrate material at the same time. In this way, a multilayer recording head with electrodes 21, 22 embedded in a ceramic body is prepared.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a recording head, for example, a resistive layer,
A recording electrode is brought into contact with the surface of a resistive layer of an ink film consisting of a conductive layer and an ink layer, and by selectively energizing the recording electrode, the resistive layer in the energized portion is heated to melt and transfer the ink in the ink layer to the recording paper. The present invention relates to a method of manufacturing a recording head for an electrical transfer recording device.

In recent years, recording heads have been required to have higher density and higher speed.0For example, if you want to increase the density of an electric transfer recording head, in principle it is sufficient to increase the density of the electrodes, but the manufacturing process There are limits to the minimum possible electrode width and electrode spacing. In order to meet this demand for higher recording density, a head structure has been proposed in which the recording density is increased by arranging electrodes in two layers in a staggered manner, as shown in FIG.

Now, as a method for manufacturing a current transfer recording head having such a two-layer electrode structure, there is a method in which electrode paste and ceramic paste are alternately screen printed on a fired ceramic substrate and then fired. The detailed steps of this method are shown in FIG.

That is, after printing and drying the first layer of recording electrodes (6I) on the fired ceramic substrate (5) as a base, a ceramic paste is applied to the recording electrodes (6, 6I) as an interlayer insulating film (7).
) is printed on the entire surface of the ceramic substrate (5).

After drying this ceramic paste, use it as a base.
After printing the first recording electrode (6t) and drying it, ceramic paste was again printed as an overcoat layer (8) to protect the surface of the recording electrode (6□), thus forming two layers. A recording head having a predetermined shape and strength is produced by firing the entire stack of recording electrodes (61) and (6□).

When the conventional manufacturing method shown in Fig. 6 was used, the following problems were observed.

■ Since the first layer recording electrode is formed on a fired ceramic substrate, the bonding force between the ceramic and the electrode is weak.

■ The second layer recording electrode is formed by overcoating on the intermediate layer (7) in Figure 5, but since the intermediate layer is coated on the first layer recording electrode, it is difficult to achieve flatness, so the electrode The paste does not adhere well and the adhesion of the electrode after firing is low.

(2) Since the number of times of drying is different between the first layer recording electrode and the second layer recording electrode, the temperature load history until the completion of firing is different. For this reason, it has been difficult to set temperature conditions under which both electrodes can be fired satisfactorily.

In fact, even when the electrodes were manufactured under various temperature conditions, peeling or cracking often occurred in the electrodes of one of the layers.

It is an object of the present invention to provide a manufacturing method that eliminates such drawbacks and can manufacture multilayer recording electrodes with high precision.

. Figure 2 is a diagram of the manufacturing process of the recording head according to the present invention. ,2
A paste containing an electrode material such as tungsten is screen printed on the layer corresponding to the recording electrode. Next, these are laminated, pressurized and heated, and fired at the same time to form a recording head.

The recording head manufacturing process of the present invention has the following effects.

■ Sintering of the unfired ceramic and baking of the electrode material are performed at the same time, so both layers are firmly bonded.

(2) Since the environment for forming the first layer recording electrode and the second layer recording electrode is the same, it is easy to optimize the firing conditions.

(2) Since the second layer of recording electrodes can be printed on the green sheet in advance, there is no problem with poor electrode coverage, unlike in the conventional overcoating method.

An embodiment of the present invention will be described with reference to FIG. 1 and a two-layer stacked recording head. First, the green sheet for the substrate (1), the green sheet for the intermediate layer (3a), and the green sheet for the overcoat (4) are produced by molding an unfired ceramic sheet to the desired thickness and dimensions. , the first layer recording electrode (
2I) pattern, green sea for overcoat)
(3a) To form a second layer recording electrode (two patterns), tungsten paste is applied using a screen printing method.

At this time, the first layer recording electrode (21) and the second layer recording electrode (21)
□) are printed at different positions in advance so as to form, for example, a staggered pattern in a stacked state. Finally, the three green sheets mentioned above are stacked and pressed so that an insulating layer is located between the electrodes, and heated in a reducing atmosphere to prevent oxidation of the electrode material, and the electrode material and substrate material are simultaneously fired. and integrate it.

In the pressure firing process, each tungsten film that becomes the recording electrode is baked onto the surface of the underlying ceramic sheet and firmly adheres to it. The ceramic components are sintered and integrated to create a multilayer recording head in which recording electrodes (21) and (2g) are embedded in the ceramic body.

In the above-mentioned head manufacturing process, screen printing of both the first and second layer recording electrodes (2,) and (2g) is performed on a flat surface, so the printing accuracy of the recording electrodes is extremely high and high density is achieved. It is easy to make changes.

Although the above embodiment describes a method of manufacturing the intermediate layer using the same green sheet as the substrate and overcoat, it can also be manufactured by other methods.

FIG. 3 is a configuration diagram of a recording head showing another embodiment, and FIG. 4 is a manufacturing process diagram of the recording head. In this embodiment, green sheets are used for the substrate (1) and overcoat (4), but the intermediate insulating layer (3b) is formed by screen printing.

That is, on a substrate green sheet (1) on which the first layer recording electrode (21) was formed by paste printing in the same manner as in the above embodiment, a ceramic paste as an intermediate insulating layer was applied by screen printing to a thickness necessary for glabellar insulation. It is made by applying it to the surface. − side 2nd layer recording electrode (2□
) is formed by printing the same electrode material as the first layer recording electrode (2, ) on the surface of the overcoat green sheet (4).

a green sheet (1) for a substrate on the first layer recording electrode side, the intermediate layer of which is formed by printing ceramic paste;
The overcoat green sheet (4) on which the second layer recording electrode is formed is laminated in a predetermined positional relationship, and is combined by pressurization and simultaneous firing to produce a recording head with a multilayer electrode structure.

In this embodiment as well, each recording electrode is formed on a green sheet having a flat surface, and the electrodes in each layer are also fabricated through the same thermal history as in the previous embodiment.

Furthermore, as described above, according to the present invention, the adhesion strength of the recording electrode to the surface of the insulating substrate is increased. Therefore, the productivity and reliability of the multilayer electrode structure recording head are improved, and a high-density recording head can be realized.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing one embodiment of the present invention, Fig. 2 is a manufacturing process diagram of the same embodiment, Fig. 3 is a block diagram showing another embodiment of the present invention, and Fig. 4 is the same embodiment. FIG. 5 is a partial sectional view of a recording head showing a two-layer electrode structure, and FIG. 6 is a manufacturing process diagram of a conventional two-layer electrode structure recording head. (1) - Green sheet for substrate. (2) -- Recording electrode paste. (3a) --- Intermediate layer green sheet. (3b) ---Interlayer ceramic paste. (4) Green sheet for overcoat.

Claims (1)

[Claims] (1) In a method for manufacturing a recording head in which recording electrode arrays are laminated in multiple layers with an insulating layer interposed therebetween, recording electrode material is applied to the surface of each of a plurality of unfired ceramic sheets molded onto a flat surface to form an electrode array shape. A method for producing a recording head, characterized in that the unfired ceramic sheets are laminated and integrated with an insulating layer positioned between each recording electrode array, and the integrated state is simultaneously fired. .