JPH01171957A - Electrode head - Google Patents

Abstract

PURPOSE:To implement high quality printing continuously, by holding electric conductors with electrically insulating supporting bodies, and using thermosetting resin having a specified hardness or less as a bonding agent for supporting and sticking electrode heads. CONSTITUTION:Electric conductors 11 are held with electrically insulating supporting bodies 12. In this constitution, a thermosetting resin having a shore hardness of 30 or less is used as a bonding agent 13 for sticking the supporting bodies 12 for electrode heads. Since the embedded type electrode heads are used, the writing parts of the electrode heads are brought into contact with a discharge recording sheet uniformly. The electrode heads are polished uniformly. Therefore all the electrode needles are brought into contact with the discharge recording sheet positively. The tips of the electrode heads are always kept clean, and an excellent writing characteristic is maintained. As the characteristics required for the bonding agent 13 for sticking the supporting bodies 12, the following characteristics are required: there is no difference in hardnesses between the electric insulating supporting bodies and the agent; and conducting foreign material is not attached at the time of heating in discharge. As the material of the supporting bodies, the following characteristics are required: excellent heat resistance, lubricity and machinability; and hardness, which does not give flaws on the surface of the discharge recording sheet. Hexagonal-system boron nitride is suitable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a writing electrode head for a recording device that converts electrical signals into visible images and records them.

BACKGROUND OF THE INVENTION In recent years, with the development of office automation, various terminal devices have been required, and in particular, there has been a great demand for recording devices that convert electrical signals into visible images, so-called printers. It is made. Among many recording devices, recording devices that conduct electricity through electrode needles, such as discharge recording, electrolytic recording, and energized thermosensitive recording, are superior in terms of high speed, record preservation, and economic efficiency (for example, Hard Copy Technology Japan (Published by Technical Center, June 1981)
However, the print quality of these recording devices was not very good. The cause of this was the structure of the writing electrode head. In other words, in order to make the current conduction and discharge phenomena occur more efficiently, it is necessary and essential to maintain good contact between the electrode needle and the recording paper, and for this purpose the electrode needle is made to protrude from the support. Ta. For this reason, it was necessary to make the electrode needles independent, and it was not possible to make the electrode needles thinner, so a resolution of 5 to 6 dots/dragon was barely achieved by arranging the electrode needles in a staggered pattern.

On the other hand, the discharge records themselves have high resolution;
A high-density recording head means high-quality prints can be made at high speed. Focusing on this point, high-density electrode heads have been devised (for example, JP-A-60-6
No. 8955).

In order to achieve high resolution, this new electrode head
The electrode needle does not protrude, it is an embedded type, and high-density grooves are created in the support mainly made of a material with excellent heat resistance, lubricity, abrasion resistance, and workability such as hexagonal boron nitride.
The structure is such that a copper wire with a diameter of 0 to 30 μm is inserted into the groove and then covered. If such an electrode head is used, 16 drifts/
It is possible to print high-quality characters such as cranes.

Problems to be Solved by the Invention However, in the above configuration, it has been found that the characteristics of the material used to adhesively fix the supports sandwiched together have a large effect on the writing characteristics on the discharge recording sheet. . In other words, if the heat resistance of the adhesive is low, it will simply melt and soften due to the heat generated by the discharge phenomenon, attracting conductive foreign matter generated by the discharge and causing a short circuit between the electrodes. Furthermore, if the hardness of the adhesive is too hard, only the adhesive layer will not be polished during printing, resulting in poor contact between the electrode needles and the discharge recording sheet, resulting in poor printing.

Means for Solving the Problems As a means for solving the above problems, the electrode head of the present invention includes:
Sheer hardness 3 is applied to the adhesive for bonding the support of the electrode head, which has an electrical conductor sandwiched between electrically insulating supports.
This problem is solved by using a thermosetting resin with a temperature of 0 or less.

Since the present invention uses an embedded type electrode head, the writing part of the electrode head uniformly contacts the discharge recording sheet and is uniformly polished, so that all the electrode needles are attached to the discharge recording sheet. Make sure to make contact. Thereby, the tip of the electrode head is always kept clean and good writing characteristics are maintained. For this reason, the characteristics required of the adhesive for bonding the support are that there is no difference in hardness from that of the electrically insulating support, and that there is no adhesion of conductive foreign matter during heat generation during discharge.

EXAMPLE Hereinafter, an example of the present invention will be explained in detail.
This example does not limit the present invention. Note that all blended parts are parts by weight.

Example 1 The figure is a perspective view of the electrode head of the present invention.

In the figure, (1) is an electrical conductor, 12 is a support, and 13
is the adhesive used for bonding. The properties required for the support material are those that have excellent heat resistance, lubricity, and workability, and are also hard enough not to damage the surface of the discharge recording sheet. Among these, hexagonal boron nitride is a soft ceramic material. is suitable.

The electrode head of the present invention is manufactured by using a dicing machine on a hexagonal boron nitride sintered body (grade IC) manufactured by Denki Kagaku Kogyo Co., Ltd., with a pitch of 100 μm, a groove width of 65 μm, and a groove depth of 6 μm.
After forming a groove of 0 μm and embedding a coated copper wire with a wire diameter of 60 μm in the groove, an adhesive having the composition shown below is applied to the surface of the support in which the coated copper wire is embedded, and a hexagonal boron nitride sintered layer is applied onto the adhesive. The solid support was placed over the support, and the supports were fixed in close contact with each other with uniform force, and heat curing was performed at 60° C. for 5 hours to obtain an electrode head with an adhesive layer thickness of 5 μm.

Epoxy resin E-828 (Shell Chemical)...
・100 Hardening agent N-001 (manufactured by Ajinomoto)...
60 Diluent DOA (manufactured by New Japan Chemical)...
・・・ 50 Viscosity adjustment Erosil (Japan Aerosil)...
... 5 As a discharge recording sheet, an average particle size of 5 μm was placed on a PET (polyethylene terephthalate) film with a thickness of 12 μm.
A roughening layer with a thickness of 6 .mu.m containing silica of m was provided, and an aluminum vapor-deposited layer was further provided thereon to obtain a discharge recording sheet capable of recording discharge.

Using the electrode head, character patterns and solid patterns were continuously printed on the discharge recording sheet using a normal discharge recording device at a head applied voltage of -50V.

Example 2 An electrode head was produced using the same materials and manufacturing method as in Example 1, with only the adhesive having the following composition.

Epoxy resin E-828 (Shell Chemical)...
・100 Hardening agent N-001 (manufactured by Ajinomoto)...
60 Diluent T) OA (manufactured by New Japan Chemical)...
... 50 Filler Hexagonal boron nitride powder (manufactured by Denki Kagaku)...
... 50 Example 3 An electrode head was created using the same materials and manufacturing method as in Example 1, with only the adhesive having the following composition.

Urethane resin E-64A (Kokusai Chemical) hardening agent
E-41BS (manufactured by Kokusai Chemical)...
50 Example 4 An electrode head was created using the same materials and manufacturing method as in Example 1, with only the adhesive having the following composition.

Urethane resin E-64A (manufactured by Kokusai Chemical)...
...100 Hardening agent E-41BS (manufactured by Kokusai Chemical)...
... 50 Filler Hexagonal boron nitride powder (manufactured by Denki Kagaku)...
... 50 Comparative Example 1 An electrode head was produced using the same materials and manufacturing method as in Example 1, with only the adhesive having the following composition.

Epoxy resin E-828 (Shell Chemical)...
・100 Hardening agent MCD (manufactured by Nippon Kayaku)...
- 80 Viscosity modifier Erosil (Japan Aerosil) Comparative Example 2 Using the same materials and manufacturing method as in Example 1, an electrode was prepared using only the adhesive with the following composition.

Epoxy resin E-828 (Shell Chemical)...
・100 Hardening agent MCD (manufactured by Nippon Kayaku)...
・ 80 Filler Hexagonal boron nitride powder (manufactured by Denki Kagaku)...
... 50 Comparative Example 3 An electrode head was produced using the same materials and manufacturing method as in Example 1, with only the adhesive having the following composition.

True melt polyester Kemit R (1) 40 (
(manufactured by Toshi) (Melting point: 175°C) Continuous printing was performed using a gutter on the electrodes obtained in the above examples and comparative examples, and the results were as shown in Table 1. was gotten.

(Margins below) Table 1 The image quality evaluations shown in Table 1 are based on visual inspection and enlarged photographs (
25 times), and the evaluation criteria are as follows.

If one roll (100m) can be printed continuously and there is no deterioration in image quality, it is rated O. If writing within 50m causes "fading" or "cutting", it is rated ×, and after 50m, the image quality is The case where deterioration occurred was marked as △.

As is clear from Table 1, when using the electrode head using the adhesive of the present invention, it is possible to print one roll (100 m) of continuous characters without any problem, and continuous printing of solid characters is possible. Even in extremely severe tests, an electrode head that did not contain hexagonal boron nitride powder achieved
After m, some "fading" occurred.

The electrode head of the present invention has lubricity, processability, and
Uses a hexagonal boron nitride sintered body with excellent polishing properties.
Its hardness was about 25 to 30 on the Scheer scale. In other words, a necessary condition for continuous printing is that both the hexagonal boron nitride sintered body and the electrode needle are worn down by a suitable amount, so that the tip of the electrode needle always has a shape that makes it easy to contact with the discharge recording sheet. Since the adhesive layer exists so as to surround the electrode needle, its hardness has a large effect on the writing characteristics.

Therefore, in order to maintain good writing characteristics, it is desirable that the adhesive layer has a hardness comparable to that of the support material, and in consideration of damage to the discharge recording sheet, the adhesive layer must have a Shear hardness of 30 or less. Further, by including hexagonal boron nitride powder in the adhesive, there is an effect of preventing conductive foreign matter or molten resin from adhering to the tip of the electrode needle.

The hexagonal boron nitride content was effective when it was loWT% or more, and from the viewpoint of adhesive strength, it was desirable to be within 60WT%, and more preferably between 20 and 30WT%. When the hardness of the adhesive layer is hard as in Comparative Examples 1 and 2, the adhesive layer around the electrode needles is not polished and contact between the electrode needles and the discharge recording sheet is prevented. Furthermore, even if the hardness of the contact layer is low, when a thermoplastic resin is used, it easily melts and softens due to the heat generated by the discharge, and conductive foreign matter adheres strongly, resulting in a short circuit between the electrodes and a short circuit across the entire surface.

Effects of the Invention As is clear from the above explanation, a thermosetting resin with a Shear hardness of 30 or less is used as an adhesive for bonding the support of an electrode head in which an electrical conductor is sandwiched between electrically insulating supports. This has the effect of realizing continuous high quality printing.

[Brief explanation of the drawing]

The figure is a perspective view of the electrode head of the present invention. (1)... Electric conductor, 12... Support, 13... Adhesive. Name of agent: Patent attorney Toshio Nakao

Claims (1)

[Claims] (1) A thermosetting resin with a Shear hardness of 30 or less is used as the adhesive for bonding the support of the electrode head in which the electrical conductor is sandwiched between electrically insulating supports. Characteristic electrode head. (2) Hexagonal boron nitride in thermosetting resin,
The electrode head according to claim (1), characterized in that the content is 10% to 60% by weight. (3) The electrode head according to claim 1 or 2, wherein the electrically insulating support is a hexagonal boron nitride sintered body. (4) The electrode head according to any one of claims (1) to (3), wherein a groove is provided in the electrically insulating support and an electrical conductor is embedded therein.