JPS63135285A - Electric-conduction thermal recording method - Google Patents

Abstract

PURPOSE:To thicken a heat-generation board to improve the strength and to lower a running cost without applying stains to an image, by a method wherein the heat-generation board consists of a resistant layer with a specific volume resistance on one surface thereof and an electric-conduction layer with a specific surface resistance on the other surface thereof. CONSTITUTION:A resistant layer of a heat-generation board is formed by a method in which a number of needle-like bodies of a conductive ceramics with a volume resistance not more than 10<5>OMEGA-cm are dispersed in a matrix of a non-conductive ceramics with a volume resistance not less than 10<6>OMEGA-cm so that the length direction thereof is oriented in the thickness direction of a planar body. An electric-conduction layer laminated on one surface of the resistant layer has a surface resistance not more than 50OMEGA. On the surface of the heat-generation board of the electric-conduction layer side, a thermal transfer recording medium and a body to be recorded such as a paper or a thermal color forming paper are overlaid, and on the surface of the heat-generation board of the reverse side to the electric-conduction layer, a conductive recording needle is abutted; in this condition, a thermal recording is performed by supplying power to the aforesaid recording needle. A high conductivity of the resistant layer in the thickness direction prevents an image from deteriorating in density and sharpness even with a larger thickness. Furthermore, the electric-conduction layer free from conduction breakage eliminates the possibility of applying stains to the image.

Description

[Detailed description of the invention] [Industrial application field] The major invention relates to an electrically conductive thermal recording method.

[Prior art]

In recent years, information has become extremely abundant, and the need for rapid transmission and recording of that information has increased, and various developments have been made regarding information management systems such as information processing systems, information transmission systems, and information recording systems. A typical example is an electrically conductive thermal transfer recording system.

As a recording material used in the above-mentioned recording system, there is, for example, an energized recording device described in Japanese Patent Application Laid-Open No. 179764/1983. What is described in the publication.

The heating resistance layer and the conductive layer are formed into one heating sheet and separated from the melting ink layer, and the heating sheet can be used repeatedly, so running costs can be lowered without reducing printing speed. There is an advantage.

[Problem that the invention seeks to solve]

However, the heat generating resistive layer as a heat generating sheet is made of polycarbonate with conductive carbon dispersed therein, or metal silicide, and the conductive layer is made of full minicum or stainless steel film. Polycarbonate in which conductive carbon is dispersed as a filler has poor durability and is extremely difficult to use when the thickness is α5 to 2.0 μm. Also, metal silicide α5~z
With a thickness of 0 μm, it is extremely easy to break and cannot withstand use alone. Furthermore, it is not easy to provide a conductive layer on these surfaces.

[Means for solving problems]

The present invention has been carried out in order to eliminate the drawbacks of the above-mentioned prior art, and its gist is that a matrix of non-conductive ceramics having a volume resistivity of 1060Ω or more and a lJ having a volume resistivity of 106Ω-σ or less are used. ? One side of the resistance layer, which is made of an electrically anisotropic plate-like body made by dispersing a large number of tt ceramic needle-like bodies with their lengths oriented in the thickness direction of the plate-like body, has a surface resistance of 50Ω. A heat-sensitive transfer recording medium and a recording medium or heat-sensitive coloring paper are superimposed on the conductive layer side of a heat-generating plate on which the following conductive layers are laminated, and a current-carrying recording needle is placed on the surface of the heat-generating plate opposite to the conductive layer surface. The recording stylus is brought into contact with the recording needle, and electricity is applied while moving the relative position of the recording needle and the heat generating plate, and the heat generated within the heat generating plate is used to perform L& thermal transfer recording or &8 thermal color recording.

The resistance layer is a layer that generates heat in the thickness direction directly below the recording needle due to the current applied from the recording needle that is in contact with the layer.A needle-shaped body of conductive ceramic is placed in a matrix of non-conductive ceramic in the direction of its length. It is an electrically anisotropic plate-like body that is oriented and dispersed in large numbers in the thickness direction of the plate-like body. The thickness of the plate-like body is preferably 1% m. Also, if it is thin, it is likely to break, so a reinforcing frame or the like may be used in conjunction with it if necessary.

The non-conductive ceramics referred to in the present invention have a volume resistance! !
It is sufficient if it is 3106Ω-σ or more, for example, Bed
, MgO%AleO, etc., AIN%BN.

Examples include nitrides such as 5isN+ and carbides such as B and C.The conductive ceramics used in the resistance layer of the present invention may have a volume resistivity of about 10<5 >[Omega]-a or less. As described above, the conductive ceramic is made up of a matrix of non-conductive ceramics dispersed in large numbers in the form of needle-like bodies with their lengths oriented in the thickness direction of the resistance layer of the plate-like body. The current from the recording stylus in contact with the resistance layer is not diffused in the plane direction, but most of the current is passed to the opposite surface of the resistance layer.

The conductive ceramic acicular body used for the resistance layer has a diameter of approximately α001 to 'f/'Itm, and a length approximately equal to the thickness of the resistance layer. Also, the distance between the needles is α
It is preferable that the range is from 001 to 000 m because the recorded image can be made clear.

The conductive ceramics used in the resistance layer include, for example, halides, silicides, nitrides, and carbides of transition metals such as ZrB*, Mo5i=, TiN, TiC, and WC, and one of these may be used. Alternatively, a mixture of two or more types may be used as long as the volume resistivity satisfies the above numerical value.

To manufacture the resistance layer, a mixture of a fibrous material made of a conductive ceramic material such as titanium carbide and a fine powder of a non-tetraelectric ceramic material such as aluminum oxide is uniaxially pressed. By extrusion molding, a molded body in which the fibrous material is oriented in the extrusion direction and dispersed in large numbers in the fine powder is produced, and the molded body is sintered in an inert gas atmosphere or in a vacuum. Is it possible to cut the solid body thinly in the direction perpendicular to the extrusion direction? It can be manufactured using Koyori. Further, as another example of the method of manufacturing the resistance layer, compound CVD (Chemical vapor deposition) is used.
sision) law. In this method, energy is applied to mixed gases, which are raw materials for conductive ceramics and non-conductive ceramics, to cause a chemical reaction and to deposit non-volatile reaction products on a substrate. By this method, it is possible to obtain a resistance layer in which a large number of needle-shaped bodies of conductive ceramics such as titanium nitride are deposited in the film thickness direction in a film of non-conductive ceramics such as silicon nitride formed on the substrate. The resistive layer can be used separately from the substrate, or the resistive layer can be used together with the substrate.

Since the resistance layer has the above-described structure, it is electrically anisotropic in that current flows selectively in the thickness direction of the layer. Therefore, even if the thickness of the resistance layer becomes large, the conductivity is not impaired, so the thickness can be increased, and a thickness that is easy to handle can be selected.

The conductive layer of the present invention is formed as a single layer on one side of the above-mentioned resistance layer, and is not destroyed by current application and acts as a counter electrode for the current-carrying recording needle, and also transfers heat generated in the resistance layer to the conductive layer for thermal transfer recording. It is conductive to the medium or 1 & thermochromic paper.

If the surface resistance of the conductive layer increases, it will no longer function as a counter electrode, so the surface resistance is set to 500 or less.

If the thickness of the conductive layer is thinner than α05 μm, it will be difficult for current to flow and it will no longer function as a counter electrode, and if it is more than 5 μm, it will be thicker than necessary as a counter electrode, and the heat from the resistive layer will be diffused. Examples of metals used in the electrolyte include aluminum, stainless steel, copper, and brass. These thin films are attached to the surface of the resistance layer, or aluminum or the like is vacuum-deposited on the surface of the resistance layer. Also, as a conductive layer, M1! is applied to the resistive surface by thermal spraying or the like. V-treated conductive ceramics can also be used.

In the present invention, the resistance layer surface r and the conductive layer surface side of the heat generating plate formed by laminating the conductive layer ? This thermal transfer recording medium and a recording medium such as paper are stacked in this order, or a thermosensitive coloring paper is stacked on the conductive layer side, and a current-carrying recording needle is brought into contact with the heating plate surface on the side opposite to the B conductive layer side. , heat-sensitive recording is performed by energizing the recording needle.

As the thermal transfer recording medium, one in which a thermal transfer ink layer is laminated on one side of an insulating base material is used.

According to the present invention, during recording, by energizing while moving the relative positions of the recording needle and the heat generating plate, it is possible to efficiently record without heat being accumulated in the heat generating plate. Furthermore, since the resistance layer of the heating plate has high conductivity in the thickness direction, even if the thickness is increased, the image density and sharpness will not be impaired. Furthermore, since the conductive layer is not destroyed by electrical current, there is no possibility of stains adhering to the image. The resistance layer has excellent abrasion resistance, good durability, and can be used semi-permanently, making it economical. It also simplifies the structure of the printer because it does not require a long heat-generating sheet as in the past.

〔Example〕

Next, examples of the present invention will be described. Hereafter simply "department"
"parts by weight" means "parts by weight".

Example L A mixture of a fibrous material made of zirconium carbide and a fine powder of Pokuro carbide was extruded under pressure in a uniaxial direction, and the fibrous material in the fine powder was oriented in the extrusion direction. A molded article was produced by dispersing a large number of the particles. The molded body was heated to 1500"C
The sintered rod sintered in the argon atmosphere above was cut into thin pieces in a direction perpendicular to the extrusion direction to form a plate-like body.

A heat-generating plate is made by forming a conductive layer of zirconium fluoride with a thickness of 2 μm on one side of the plate-shaped body. (That's it.

The surface resistance of the conductive layer was O, OSΩ.

Ketone resin (manufactured by Okawa Chemical Co., Ltd., trade name Halon 8o)
ioo moiety-associated metal dye (manufactured by Tsuchiya Chemical Co., Ltd., part name: Subiron Black BNH)
Part 25 Mitsuroku 15
Part carnauba wax 15 parts Ethyl acetate 50 parts Toluene
25 parts Next, the formulation having the above composition was dissolved and dispersed, coated on the other side of the polyester film, and dried to form a 3 μm thick thermal transfer layer to obtain a 9 μm thick thermal transfer recording material.

The resulting heat-sensitive transfer recording material was cut into 7-inch width pieces, the polyester film surface of the heat-sensitive transfer recording material was superimposed on the conductive layer of the heating plate, and a mimeograph paper making machine (manufactured by Gesteftner, trade name: GuestFax 1100) was modified. A high-quality paper is brought into contact with the underside of the heat-sensitive transfer layer, a recording needle is brought into contact with the heat-generating plate, and a voltage of 20 V is applied, and the scanning line density is 1.
When electricity was recorded under the conditions of 6/1 recording speed 12 m/5, there were no stains, no carbon black scattering, and no bad odor.
No through holes were formed in the heating plate or the polyester film, the conductive layer was not destroyed by discharge, and a clear black image was obtained on the high-quality paper without being cut during recording. The density of the obtained image was 130, and the resolution was 161/cod.

Similar results were obtained after the heating plate was used 20 times.

Example 2 The conductive layer of Example 1 had the same structure as Example 1 except that a 3 μm thick stainless steel foil was attached to the resistance layer instead of the zirconium boride. The surface resistance of the conductive layer is α2
When electricity was applied and recorded in the same manner as in Example 1, which was X10-20, a clear black image was obtained without the conductive layer being destroyed by discharge. Image density L25, resolution 161/
m, and the same results were obtained even after repeated use 10 times.

Example 3 Electrification recording was performed under the same conditions as in Example 1 using thermosensitive coloring paper (manufactured by Jujo Paper Co., Ltd., trade name: JUJO Thermal) instead of the heat-sensitive transfer recording material and high-quality paper of Example 1. A clear black image was also obtained. Image density 12o
.

The resolution was 1otl.

Similar results were obtained after repeated use 20 times.

〔Effect of the invention〕

Since the present invention has the above-described structure, the heat generating plate can be made thicker to increase its strength and be easier to handle, and since the heat generating plate has excellent durability during recording, there is no need to replace it and it can be used semi-permanently. , running costs can be significantly reduced. Furthermore, even if the heating plate is made thicker, the image density and sharpness will not deteriorate. Furthermore, since the conductive layer of the heat generating plate is not destroyed by electricity, there is no possibility of stains adhering to the image. Furthermore, it can also be applied to conventionally used heat-sensitive transfer recording media and heat-sensitive coloring paper.

Claims (1)

[Claims] 1. A non-conductive ceramic matrix having a volume resistivity of 10^6 Ω-cm or more has a volume resistivity of 10^5 Ω-cm.
A surface resistance layer is formed on one side of a resistance layer made of an electrically anisotropic plate-like body, which is made by dispersing a large number of conductive ceramic needle-like bodies of cm or less in size with their lengths oriented in the thickness direction of the plate-like body. 5
A heat-sensitive transfer recording medium and a recording medium or heat-sensitive coloring paper are superimposed on the conductive layer surface side of a heat-generating plate on which a conductive layer having a conductivity of 0Ω or less is laminated, and conductive recording is performed on the surface of the steel heat-generating plate opposite to the conductive layer surface. A current-applying thermal recording method characterized in that a stylus is brought into contact with the recording stylus, the relative position of the recording stylus and a heat-generating plate is moved while energization is applied, and thermal transfer recording or heat-sensitive color recording is performed using the heat generated within the heat-generating plate. 2. The electrically conductive heat-sensitive recording method according to claim 1, wherein the conductive layer is made of conductive ceramics. 3. The electrically conductive heat-sensitive recording method according to claim 1, wherein the conductive layer is a metal thin film.