JPS5941876B2 - Electrifying colored paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrified colored paper that directly converts electrical signals into visible images.

Conventionally, this type of recording paper was published in Japanese Patent Application Laid-open No. 48-10193.
As shown in Publication No. 5, etc., a recording paper has been proposed in which a conductive layer is provided on a high-quality paper and a coloring layer is provided on the ground.

In such a conventional example, when a voltage is applied to the recording paper, a current corresponding to its impedance constantly flows. In other words, in conventional energizing colored paper,
Due to its configuration, it was impossible to provide a switching function in which current does not flow below a certain voltage, and current only flows when a voltage higher than that voltage is applied. In view of these points, the present inventors provided an insulating layer between the conductive layer and the coloring layer or on the surface of the conductive material particles.
The present invention provides an energizing colored paper that has a switching function in which current is turned on and off at a certain level of voltage.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 shows an example of the cross-sectional structure of the electrifying colored paper according to the present invention.

1 is usually a flexible support such as paper or plastic, and 2 is a conductive layer provided on the support.

As the conductive layer, a metal vapor deposition film such as aluminum or zinc,
Alternatively, it is suitable to use an inorganic conductive material such as graphite powder, or a compound semiconductor such as cuprous iodide, zinc oxide, indium oxide, etc., dispersed together with a resin binder, and coated and dried on a support. 3 is an insulating layer, and a thin film of resin or the like is used.

In fact, as a method for forming this insulating layer, it is preferable to attach a thin film of resin onto the conductive layer, or to apply and dry an appropriate solution or dispersion of the resin onto the conductive layer.

The resins used for this insulating layer include thermoplastic resins such as polyurethane, polystyrene, polyester, polyethylene, and polyvinyl chloride; thermosetting resins such as melamine resin and phenolic resin; and styrene, which is usually used as a binder. Water-soluble resins and water-dispersed resins such as maleic acid copolymers, polyvinyl alcohol, and styrene-butadiene latex are suitable. 4 is a coloring layer, which is composed of a conductive material, a coloring component, and a resin 7 binding material.

As the conductive material used here, white or light-colored compound semiconductors such as cuprous iodide, indium oxide, zinc oxide, and tin oxide are suitable. As the color-forming component, a combination of a leuco dye, which is a heat-sensitive color-forming material, and a phenolic compound, a combination of a metal soap and an organic spotting reagent, etc. are used. FIG. 2 is a cross-sectional structure of another example of the electrifying colored paper according to the present invention.

1 and 2 are the support and conductive layer as described above.

5 is a coloring layer provided on the soil, and its detailed structure will be explained next.

Reference numeral 6 indicates particles of a white or light-colored compound semiconductor conductive material as already mentioned, and reference numeral 7 indicates an insulating layer provided on the surface thereof.

The method for forming such an insulating layer on the particle surface is as follows:
A suitable method is to use a microcapsule manufacturing technique such as a rotary rolling method or a spray drying method for a solution or dispersion of a resin or the like. 8 and 9 are color-forming components, and heat-sensitive color-forming materials are also used here.

Figure 3 shows the method for coloring the colored paper mentioned above.
10 is colored paper, 11 is a recording needle electrode, 12 is a counter electrode, 13
is a power supply, and 14 is a switch.

Specific examples will be explained below.〇Example 1 Polyurethane and polyvinyl chloride in a weight ratio of 1:1
A 10 weight percent solution of this mixture in tetrahydrofuran is prepared.

This solution is applied onto aluminum vapor-deposited paper (Metalized Paper, manufactured by Kojin Co., Ltd.) and dried so that the thickness of the resin after drying is approximately 0.1 μm. Furthermore, a coloring layer dispersion liquid having been dispersed at the solid content weight ratio shown below is applied thereon and dried using a wire bar adjusted so that the thickness after drying is about 10 μm. When voltage was applied to the recording paper obtained in this way using the circuit configuration shown in Figure 3,
When the voltage reached +8V, no current flowed and no color development occurred, but when the voltage was increased to +10V, current flowed and clear blue recording marks were obtained. Also, the same thing happened even when the polarity of the recording needle was changed. This is because the insulation of the insulating layer between the conductive layer and the coloring layer breaks only when a voltage of 10V is applied, and the current flowing after that breaks. This is because the heat-sensitive coloring material in the coloring layer developed color due to Joule heat. Incidentally, since the counter electrode had a large contact area, the current density was very small and no color development occurred. In addition, the current-voltage characteristics during recording can be measured using a curve tracer (Kikusui Electronics Co., Ltd.).
As a result of measurements made using a method (manufactured by J.D. Co., Ltd.), the switching characteristics shown in FIG. 4 were exhibited. Example 2 Acetone solution of indium oxide fine powder and melamine (
10% by weight) to a resin thickness of 0.05 μm on the surface of the indium oxide particles using a spray dryer method.
Melamine resin is formed to have a thickness of ~0.1μ.

The obtained conductive material particles and coloring component are dispersed in water at the following weight ratio. The dispersion thus obtained is applied onto aluminum vapor-deposited paper using a wire bar adjusted so that the thickness after drying is approximately 10 μm, and dried with hot air and hot rolls.

When voltage was applied to the recording paper obtained in this way using the circuit configuration shown in Figure 3, no current flowed up to +25V and no color development occurred, but at +30V no current flowed. As soon as it started, a clear blue recording mark was obtained. Also, the same thing happened even when the polarity of the recording needle was changed. This is because the insulation of the insulating layer provided on the surface of the conductive material particles breaks only when a voltage of 30 V is applied, and coloring occurs due to the Joule heat of the current. This is because 0
Also, when looking at the current-voltage characteristics during recording with a curve tracer, it showed switching characteristics similar to those in Example 1. As is clear from the above explanation, the current turns on and off at a certain voltage. Electrifying colored paper having a switching function is essentially impossible with the conventional structure, and can only be made possible by providing an insulating layer that can be used in accordance with the present invention.

Furthermore, by changing the material and thickness of this insulating layer, it is easy to create an energizing colored paper that switches at a desired voltage. As an example in which an insulating layer is provided on the surface of a recording paper, there is already a discharge breakdown recording paper.

In this case, since the insulating layer on the surface is destroyed by high voltage during recording, recording gas and odor are generated, which is a major problem. In the electrifying colored paper according to the present invention, an insulating layer was provided inside the recording paper, so that the insulating layer did not scatter to the outside when dielectric breakdown occurred, and there was very little odor. Furthermore, the switching characteristics of the energized colored paper of the present invention enable matrix drive in multi-needle recording, and also make it possible to simplify the recording apparatus for this purpose.

First, in the energizing colored paper according to the present invention, when recording is performed using an alternating current signal, there is also the effect of improving recording efficiency. That is, in the conventional example, color development does not occur in a region where the voltage is low and the current density is small, and power is wasted in that region. Regarding the energizing colored paper in the present invention,
There is no such wasted power consumption, and in fact, the recording efficiency is doubled in the case of AC recording compared to the conventional example.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the cross-sectional structure of the energizing colored paper according to the present invention, FIG. 2 is a diagram showing another example of the structure of the energizing colored paper, and FIG.
The figure shows the circuit configuration during recording on the energized colored paper, and FIG. 4 is a current-voltage characteristic diagram during recording on the energized colored paper of the present invention.〇1...Support, 2... ...conductive layer, 3,
7... Insulating layer, 4, 5... Coloring layer, 6
... Conductive material particles.

Claims (1)

[Scope of Claims] 1. An energizing coloring paper characterized by having an insulating layer between a conductive layer and a coloring layer that has a function of dielectric breakdown and switching at a voltage exceeding a certain level. 2. It comprises a support, a conductive layer, and a coloring layer, and the surface of the conductive material particles contained in the coloring layer has an insulating layer that has a function of dielectric breakdown and switching at a certain voltage or higher. Electrifying colored paper.