JPS60198246A - Preparation of electrode head - Google Patents

Abstract

PURPOSE:To obtain an electrode head capable of performing recording with high resolving power, by forming an electrically conductive layer into a desired pattern on a support layer and placing a fixing material comprising a mixture of a lubricating inorg. filler and a thermosetting resin to perform integral molding before removing the support layer. CONSTITUTION:Copper is laminated onto a support layer 31 such as a polyimide film by an electrodeposition method to form a laminate 34 and the copper layer thereof is formed into stripe shaped electrodes 32 by photoetching. Next, a fixing material, which is prepared by mixing a lubricating inorg. filler such as a hexagonal boronitride powder and an uncured thermosetting resin, is placed on said electrodes and heated to integrally mold the support 31, the electrodes 32 and the fixing material 33. At last, the support layer is removed by etching to obtain an electrode head enabling resolution of 10 lines/mm..

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing an electrode head for a recording device that records electrical signals on a recording medium.

Conventional configurations and their problems In recent years, office automation has required a variety of terminals. Among them, there is a great demand for recording devices that convert electrical signals into visible images, so-called printers.
2. Description of the Related Art Conventionally, recording devices have been manufactured using various methods. At the same time, development of high-resolution heads for each method is progressing.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electrode head of a recording device using a conventional discharge rupture recording paper will be described below with reference to the drawings.

FIG. 1 is an exploded cross-sectional view of an electrode head of a recording device using conventional discharge rupture recording paper (hereinafter referred to as a discharge printer). It is made by fixing the electrode needle 13 to the tip with solder 14 and then supporting it with fixing materials 15 and 16. This is the adhesive layer with 17 layers.

However, according to the above manufacturing method, the electrode needle 1
3 is fixed with the solder 14, and if the interval between the electrode needles is narrowed, fixing with the solder 14 becomes difficult.

Furthermore, since the electrode needles protrude, thick electrode needles must be used. Therefore, there was a problem in that it was not possible to create an electrode head that enabled high-resolution recording.

Therefore, there is an electrode head as shown in FIG. 2 that is capable of high-resolution recording. This is a flexible printed circuit board 26f with copper foil etched into stripes:
An adhesive 22'f: is used to integrate the fixing material 21 of the resin molded product. Here, 23 is a polyimide film,
24 is an adhesive layer, and 26 is a copper foil etched into stripes.

However, in this electrode head, the heat generated during recording destroys the adhesive layer 24 that fixes the copper foil 25 and the polyimide film 23, the adhesive 22 that bonds the polyimide film 231, the flexible printed circuit board, and the fixing material. As a result, the restripe-like copper foil was deformed due to dust that was generated during recording. Furthermore, since the fixing member 21 is made of a resin molded product, the recording paper is scratched during recording, making it impossible to record well.

OBJECT OF THE INVENTION An object of the present invention is to provide a method for manufacturing an electrode head that enables high-resolution recording.

Structure of the Invention The method for producing an electrode head of the present invention includes the steps of forming the electrically conductive layer into a desired pattern in a laminate consisting of an electrically conductive layer and a support layer, and forming a part or the entire surface of the pattern on the electrically conductive layer. A step of integrally molding the laminate and the fixing material by placing a fixing material made of a mixture of a lubricating inorganic filler and a thermosetting resin on the substrate, and a step of etching only a portion or the entire surface of the support layer. The company has established a manufacturing method for electrode heads that enables high-resolution recording.

However, the lubricating inorganic filler is a material with excellent properties of lubricity, heat resistance, and electrical insulation, such as hexagonal boron nitride, talc, kaolin, and carbon fluoride. Description of an Embodiment An embodiment of the present invention will be described below with reference to the drawings.0 [Example 1] Figures 3 (a) to (Q) show the manufacture of an electrode head in an embodiment of the present invention. The process of the method is shown in cross-sectional view. In FIG. 3, 31 is a support (for example, a polyimide film), 32 is a striped electrical conductor (for example, copper foil),
33 is a fixing material (for example, a molded product of a mixture of 60% by weight hexagonal boron nitride and 4% by weight thermosetting resin), and 34 is a laminate consisting of the electrical conductor 32 and the support layer 31.

The manufacturing process will be described below in order.

In FIG. 3(B-), an electrode 32 in the form of stripes (line width 50/jml, line spacing 7zm) is formed by photoetching the copper of a laminate 34 in which 20 μm of copper is laminated by electrodeposition on a polyimide film 31. It is something. Next, a fixing material (containing 60% boron nitride f: 60% by weight) mixed with an uncured thermosetting resin (epoxy resin) is placed on it and heated at a temperature of 16oC for 1 hour. The electrode 32 and the fixing member 33 in the form of a toss drive are integrally molded on the support 3 (FIG. 3(b)).

Finally, the entire surface of the polyimide film 31 as a support is etched using hydrated hydrazine, followed by washing with water, substitution with alcohol, and drying to obtain an electrode head capable of resolving 10 3 / 3 particles (see Fig. 3). C)).

According to the method for manufacturing an electrode head of the present invention, an electrode head capable of high-resolution recording can be easily obtained without soldering the electrode needle or protruding the electrode needle as in the conventional method. Furthermore, since the fixing material contains hexagonal boron nitride, an electrode head that can print without damaging the recording paper during printing can be obtained.

[Example 2] Hexagonal boron nitride powder and thermosetting resin as a fixing material for an electrode head obtained by the same manufacturing method as in Example 1 --+1fl+
11^: pA, Il, ? Table 1 shows the results of evaluation by attaching the electrode head obtained in -Used as Rokuno I2 small medium medium to a discharge printer and printing on discharge breakdown recording paper.

Table 1 h-BN content and evaluation h-B as an electrode head
N: Hexagonal boron nitride In Table 1, printing quality is an evaluation of the stability of the dot shape after printing 50,000 characters. The resistance to dust is about the level of dirt on the tip of the electrode head after printing 50,000 characters. Hardness is a total evaluation of whether printing can be done without damaging the discharge rupture recording paper when printing on the discharge rupture recording paper. Flame retardancy was evaluated based on UL Standard 94 using a test piece with a thickness of 1/16 inch. Processability is determined by whether the striped electrodes can be transferred to the fixing material.

As is clear from Table 1, the hexagonal boron nitride content is 10
If it is less than the weight percent, the area around the electrode will be destroyed by heat during printing, and dust generated during recording will adhere there, causing deformation and disconnection of the electrode, making it unusable as an electrode head. Furthermore, when the content of hexagonal boron nitride exceeded 90% by weight, the striped electrode could not be transferred to the fixing material and could not be evaluated as an electrode head.

From the above, it can be concluded that the fixing material for which the method of manufacturing an electrode head of the present invention is effective and which can be used as an electrode head should preferably contain 20 to 80 weight percent of hexagonal boron nitride. More preferably, those containing 40 to 70% by weight exhibited a greater effect.

[Example 3] A mixture of Merck powder and thermosetting resin (epoxy resin) was used as the fixing material for the electrode head obtained by the same manufacturing method as in Example 1, and the mixing ratio of talc and thermosetting resin was varied. The obtained electrode head was attached to a discharge printer, and the results were evaluated by printing on discharge breakdown recording paper, and the results are shown in Table 2.

Table 2 Evaluation of talc content and electrode head In Table 2, printing quality and resistance to dust.

Hardness, flame retardancy, and workability were evaluated using the same evaluation methods as in Example 2. As is clear from Table 2, when the Merck content was less than 20% by weight, the area around the electrodes was destroyed by the heat generated during printing, and the insulation between the electrodes was damaged due to the accumulation of dust generated during recording. I couldn't use it. Furthermore, when the talc content exceeded 90% by weight, the striped electrodes could not be transferred to the fixing material and could not be evaluated as an electrode head.

From the above, even when a mixture of talc and thermosetting resin is used as the fixing material, the method for manufacturing the electrode head of the present invention is effective as long as the Merck content is within the range of 3° to 80% by weight. , can be used as an electrode head. Preferably, those containing 50 to 70 weight percent exhibited a greater effect.

In this way, similar results were obtained even when talc was used instead of hexagonal boron nitride as the fixing material.

In addition, although the manufacturing method of the electrode head using copper as the electrode formed in the stripe shape was described in the Example, it is not limited to copper and other electrical conductors may be used. For example, nickel etc.

When a polyimide film is used as the support layer, it is sufficient if the electrical conductor used as the electrode and the support can be selectively etched. As for the fixing material, we used a thermosetting resin containing hexagonal boron nitride or talc as a lubricating inorganic filler. It can be easily inferred from the present invention that the material has excellent insulation properties.

As is clear from the above explanation, the present invention provides a step of forming the electrically conductive layer into a desired pattern in a laminate consisting of an electrically conductive layer and a support layer, A step of integrally molding the laminate and the fixing material by placing a fixing material made of a mixture of a lubricating inorganic filler and a thermosetting resin on one part or the entire surface; This method includes an etching step, and is a method that can easily produce an electrode head that enables high-resolution recording.

Furthermore, by using hexagonal boron nitride or a mixture of talc and thermosetting resin as a fixing material.

Another advantage is that an electrode head that does not scratch the recording paper during printing can be obtained.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view when a conventional electrode head is disassembled, Figure 2
The figure is a cross-sectional view of a conventional high-resolution recording electrode head, and Figure 3 (
IL), (b), and (0) are cross-sectional views showing a method of manufacturing an electrode head in the order of steps in an embodiment of the present invention. 11.23... Polyimide film, 12. Old... Copper foil formed in a stripe shape, 13... Electrode needle, 14... Solder, 15, 16, 21. 33
・・Fixing material, 22 ・・Adhesive, 17, 24
...adhesive layer, 25°32 ... striped electrical conductor, 26 ... flexible printed circuit board, 34 ... laminate. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 1.9 Figure 2 Figure 3 Figure 2

Claims (1)

[Scope of Claims] (1) A step of forming the electrically conductive layer into a desired pattern in a laminate consisting of an electrically conductive layer and a support layer, and lubricating a part or the entire surface of the pattern. a step of placing a fixing material made of a mixture of a thermosetting inorganic filler and a thermosetting resin and integrally molding the laminate, the fixing material, and metal; and a step of etching only a portion or the entire surface of the support layer. A method for manufacturing an electrode head characterized by: (Kan) Production of an electrode head according to claim 1, which uses hexagonal boron nitride as a lubricating inorganic filler of the fixing material and contains 20 to 80 weight percent of hexagonal boron nitride. Law. (3) Using Merck as a lubricating inorganic filler for the fixing material,
Claim 1, characterized in that it contains 30 to 80 percent by weight of talc.