JPH02188292A - Electrotransfer recording and energization head - Google Patents

Abstract

PURPOSE:To record the data in full color at a high speed and with high sensitivity by combining the thermal diffusion factors of a resistor sheet and an insulating support of an energization head with their respectively specified ranges. CONSTITUTION:A resistor sheet 1 consists of the first resistance layer 11 and the second resistance layer 12. The first resistance layer 11 is made using resistive film formed by adding conductive particles 17 such as carbon to heat- resistant resin. The second resistance layer 12 compensates for the insufficiency of the first resistance layer, and requires heat resistance, lubrication, appropriate resistance and surface property. The layer 12 consists of at least, conductive inorganic particles 14, non-conductive inorganic particles 15 and heat-resistant resin 16. An energization head 2 is composed of a stylus 21, a common electrode 22 and a support 23 and a ceramic material is used for the support 23. The thermal diffusion factor A of the second resistance layer is 1 to 100 based on a unit of 10<6>m<2>/S, and the insulating support of the energization head is 0.1 to 50.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrical transfer recording method and an electrical head used in the field of image formation that provides high-speed, high-sensitivity, and high-quality images.

BACKGROUND OF THE INVENTION In the generally known current transfer recording technology that uses molten ink as a coloring material, a film containing carbon in a carbon dioxide resin is used as a resistance sheet. The thermal diffusion coefficient of this resistor sheet has a value of approximately 105 m2/s. In addition, in order to reduce the contact resistance between the current-carrying head and the resistance sheet, a conductive thin film is deposited on the surface of the resistance sheet (first resistance layer) as a second resistance layer by PVD (PVD).
e) Formed by law. Literature (K.K.C., Te4-” C.C.1-1) 0 Rossi r-
4 Sixth Off゛ 9″ Varnish Fichy (-, 28/1. Pages, 87-91 (19B?)
) has a specific resistance of 0.03 t-m cm as a second resistance layer.
It is stated that contact resistance can be expected to be reduced by forming the following Cr-N thin film with a thickness of 100 OA' or less.

The multilayer resistive sheet thus formed has a thermal diffusion coefficient of at most 106m21s. Further, as an insulating support for holding an electrode array (multi-stylus) of a commonly used current-carrying head, ceramics such as Multi-1, Kutos-1 thermosetting resin, etc. are used.

Problems to be Solved by the Invention However, when performing gradation recording using sublimable dye as a coloring material in order to obtain full-color, high-quality images, recording 137
Because of the high cost, the conventional electrical transfer recording method has the following problems.

(1) Resistance sheets containing carbon in the 6-liquor base have poor heat resistance and thermal sliding properties when a current-carrying head is brought into contact with them to record, resulting in dirt on the heave surface and deterioration of image quality. let Although the contact resistance can be reduced when a second inorganic thin film resistance layer is provided using the PVD method, the thermal sliding properties are particularly poor, and the friction coefficient between the resistance sheet and the head is not reduced because no measures have been taken to reduce the friction coefficient between the head and the head. Causes stains. This tendency is significant in relative speed multiple recording (a recording method in which the traveling speed of the transfer member is slowed with respect to the recording paper), and furthermore, the thermomechanical and electrical characteristics of the resistance sheet are greatly deteriorated.

(2) When a configuration in which a stylus electrode and a common electrode are opposed to each other is used as a current-carrying head and the signal current is recorded in parallel to the heat-generating substrate, the current density distribution is concentrated near the stylus, resulting in a large and homogeneous recording dot. It is not suitable for gradation recording.

(3) The thermal diffusion coefficients of the insulating support and resistance sheet of the head have not been optimized, and high speed and high sensitivity have not been achieved in consideration of heat storage control.

The present invention aims to solve the problems of the prior art.

Means for Solving the Problems The present invention provides a current transfer recording method in which recording is performed by contacting a current-carrying head to a resistive sheet, in which the thermal diffusion coefficient of the resistive sheet is in the range of (1-100) x 106 m2/s. The thermal diffusion coefficient of the insulating support of the current-carrying head is (0,1-
1-50) A current transfer recording method that is carried out using combinations in the range of xlo6/s, characterized in that the friction coefficient between the single surface of the current-carrying head and the resistance sheet is 0.2 or less. be.

If the thermal diffusion coefficient of the insulating support of the working current-carrying head is large, high-speed response will be good, but thermal efficiency will be poor. If the thermal diffusion coefficient is small, thermal efficiency is good, but high-speed recording is impossible due to heat accumulation. However, even in such a current-carrying head with a small thermal diffusion coefficient, if the thermal diffusion coefficient of the resistive sheet in contact with the hept is increased, heat accumulation in the head and the resistive sheet can be suppressed and high-speed, high-sensitivity recording with good thermal efficiency can be achieved.

Furthermore, the thermal energy from the head is not concentrated in the vicinity of the stylus electrode, but is homogenized in front of the counter electrode, making it possible to record smooth gradations.

Furthermore, by reducing the coefficient of friction between the head and the resistance sheet at high temperatures, head contamination due to melting of the resin of the resistance sheet is reduced, and a homogeneous recording toft can be obtained.

Embodiment FIG. 1 shows a cross-sectional view of the structure of an embodiment of the present invention, and FIG. 2 shows a comparison between a conventional example and a characteristic example according to the present invention.

In the figure, 1 is a resistance sheet, 2 is an energized electrode, 3 is a coloring material layer, 4 is a transfer body, 5 is an image receiving paper, and 6 is a platen.

The resistance layer 1 consists of a first resistance layer 11 and a second resistance layer 12. The first resistive layer 11 is a resistive film formed by mixing conductive particles 17 such as carcasses into a heat-resistant resin. Is this heat-resistant resin suitable? Lamito, Ne0licarneto, Ne0su Iλ Chill,
Resins that can be used to form a film, such as Hon0 Lihueni Rufuide and Hon0 Rietherketone, are used. These resistive films have a thickness of about 4-10 μm and have a surface resistance of 1 ohm, but since they contain 10-30% of h-bons, the surface is rough and the inside of the film is also porous. The thermomechanical strength deteriorates.

The second resistance layer 12 compensates for the disadvantages of the first resistance layer and requires heat resistance, slipperiness, appropriate resistance and surface properties,
At least conductive inorganic particles 14 and non-conductive inorganic particles 15
and a heat-resistant resin 16. This may also contain an organic lubricant. It has a thickness of about 0.2-6 μm, and its surface is slightly roughened with inorganic particles and has a surface resistance one order of magnitude higher than that of the first resistance layer. When the second resistance layer is used as the main heat generating layer, a smaller surface resistance is used.

The heat-resistant resin 16 may be a thermosetting resin, an ultraviolet curable resin, or the like. More specifically, I * 0 xy, melamine, tan, various 7-1 route types, silicones (orkanoflu]xysilane-based bar)-1-) materials) or silanes with 7-1 route types, Titanate-based Coblink-Reactant, Cooler 7) Reactant is used. As the conductive inorganic particles 14, metal particles having a particle size of carnesihurak (ketchenzurak) or sahuumiku (sahuumiku) or less when fishing on a boat, and gourafite can also be used.

As the non-conductive inorganic particles 15, abrasive materials such as silica, Flumina, titanium oxide, and silicon carbide having a particle size of Safumi'70 or less, and solid lubricants such as molyph disulfide and talc are used. Organic lubricants include reactive and non-reactive silicones.
Di-oil, carbon-based and fuso-based surfactants are used.

The second resistance layer composition described above is formed by preparing a coating material so that the weight ratio of 14:15.16 is approximately 1:1:1. However, the weight ratio is not limited to this.

The color material layer 3 is formed of at least a sublimable dye and a binder resin. The transfer body 4 consists of a resistance sheet 1 and a coloring material layer 3.

The energizing head 2 is configured as a line head by a stylus 21, a common electrode 22, and a support 23. 21. The electrode 22 is made of copper, aluminum, titanium, brass, etc., and the electrode 23 is made of ceramics (nitride ceramics, mica ceramics, etc.) which are more abrasive than the electrodes and have greater wall-to-wall properties. Also, the resolution of the electrode is 6-16
F-t/mm.

The signal current path applied between the electrodes 22, 22 flows vertically through the second resistive layer and parallel to the membrane through the first resistive layer. The recording conditions at this time were that the pulse width applied to one dot was 1 ms,
When the recording period of one line is 4 ms, the bead temperature of the heat generating part reaches 300-400°C. The current density distribution, ie, the bead temperature distribution, is particularly large directly below the stylus electrode. The transfer body 4 and the image receptor 5 run between the brushing heads under such high temperature and high pressure (3 g/100 cm). At this time, electrical contact with the electrode is made by the conductive inorganic particles 14 whose surface has been slightly roughened, and by the composition of the second resistance layer 12 which is instantaneously generated on the head by the non-conductive inorganic particles 15. It cleans dirt and provides interfacial lubricity between the head and the resistor layer. The organic lubricant contained in the first and second resistance layers oozes out to the interface at high temperatures and provides lubricity. At this time, since the resistance layer 12 has a large proportion of inorganic particles, it is also designed to be heat resistant. If dirt accumulates on the head, high quality gradation recording cannot be obtained. In order to be able to record smooth running between the head and seat, the coefficient of friction between them must be 0.0 at room temperature.
It was experimentally found that 2 or less is required. In order to promote this, the head may be configured so that the lubricant flows out from the surface of the head at high temperatures.

On the other hand, the thermal diffusion coefficient A (A=to/dc, k: thermal conductivity, d: density, C: specific heat) of the above-mentioned second resistance layer is 1.
It has a value of 1-100 in units of o6II+2/s.

The value of A of the first resistance layer is 0.2 or less. A of 7 lamid film without car horn (direct is 0.05,
? aluminum, copper, aluminum, silicon,
Silicon carbide etc. have a value of 20-150. In this way the second
Since the resistance layer has an A value close to that of metal, the high bead temperature directly under the stylus is diffused and lowered. Therefore, the recorded talk becomes largely homogeneous, and the first and second resistances N
The thermal burden on the composition is reduced.

Regardless of the thermal diffusion coefficient of the resistance sheet, if the thermal diffusion coefficient of the insulating support of the current-carrying head is large, high-speed response is good, but thermal efficiency is poor and a large recording energy key is required. When using a conventional resistance sheet with a small thermal diffusion coefficient, an insulating support with a small thermal diffusion coefficient has good thermal efficiency, but fogging of the recorded image occurs due to heat accumulation, making it unsuitable for high-speed recording. However, if a resistive sheet with a large thermal diffusion coefficient as described above is used at this time, the heat accumulated on the head is absorbed and high-speed, high-sensitivity recording becomes possible. The situation is shown in Figure 2. The figure is a graph on a logarithmic scale.

An insulating support material with a relatively large thermal diffusion coefficient is nitride Nerosi (
A=15),? Comparatively small insulating supports such as lumina (A=6), aluminum (A=0.5), mica ceramics (A=1), etc. The following combinations of thermal diffusion coefficients of the resistance sheet and the insulating support are preferred.

A of the resistance sheet: (1-100) A of the insulating support of the current-carrying head: (0,1-50) Further specific examples will be described.

(1) Current-carrying head: A6 size paper sheet, resolution 6 tots/mm (stylus electrode material is tank insulator), mica ceramic insulating support, application width 1941 1 ms, recording cycle 4 ms/light, pressure 3 at g/1100 III. Constant velocity record and relative velocity record. (Speed ratio n=1-(2) First resistance layer: 7 Lamitor resin mixed with resin was formed into a film having a thickness of 6 μm and a surface resistance of 1.

(3) Resistance layer of i2 Ketjenflac 1 with a secondary particle diameter of 10 mu, primary particle diameter of 10+ produced by vapor phase growth method
+U silicon dioxide 1, 1 piece'4 resin 0.8, isocyanate 0.2, silicon dioxide 1
The first layer was added to a thickness of 4u to give a weight solids ratio of 10.05.
A film formed on the resistive layer.

(4) Coloring material layer: Formed to a thickness of 10 parts of OV7 cyan sublimable dye and 1 part of resin by weight/solid content.

(5) Receiver ff 1 body: Formed to a thickness of 8u on a 100u opalescent PET film with a weight solid content ratio of 1 liter of real ester resin and 0.2 silica.

As a result of a recording experiment conducted under the above conditions, as shown in the unmarked area in Figure 2, there was no fog in the image with a recording cycle of 4 ms/line and 2 J/cm2 recording 12 JTh, and smooth gradation recording characteristics were achieved using the relative velocity method. I got it. This recorded image is 9-
? The image quality is equivalent to that of dye transfer recording using a JL head as a recording means. In addition to the dyes mentioned above, magenta color, 410
Using color, I was able to create a 171 color image of an A6 size sword in about 10 seconds.

Effects of the Invention As described above, according to the present invention, (1) high-speed, high-sensitivity full-color recording with a 1-line recording speed of 4 as and a recording energy of 2jlCI112 has become possible. Also, (2)
A relative speed ratio n=10 was obtained under the above recording conditions. Furthermore,
(3) It is possible to provide a stable resistance sheet without hecto-stains. Furthermore, (4) large and uniform recording bits can be formed.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the structure of one embodiment of the present invention, and FIG. 2 is a graph showing a comparison of characteristic examples between the present invention and a conventional structure. l...Resistance sheet, 2...Electrifying head, 23...
...Insulating support. Name of agent: Patent attorney Shigetaka Awano (1 person) Figure 1 Figure 2 Thermal diffusion coefficient (106m2//s)

Claims (3)

[Claims] (1) In a current transfer recording method in which recording is performed by contacting a current-carrying head to a resistive sheet, when the thermal diffusion coefficient of the resistance sheet is in the range of (1-100) x 10^6 m^2/s, the current-carrying head The thermal diffusion coefficient of the insulating support is (0.1-5
0)×10^6 m^2/s. (2) The energization transfer recording method according to claim 1, wherein the energization transfer recording method is carried out at a coefficient of friction between a single surface of the energization head and the resistance sheet of 0.2 or less. (3) The thermal diffusion coefficient of the insulating support of the head is (0.1-
50) x 10^6 m^2/s, and a friction coefficient of a single surface of the current-carrying head with the resistance sheet is 0.2 or less. energizing head.