JPH08238853A - Thermal recording paper - Google Patents

Abstract

PURPOSE: To provide two color type thermal recording paper capable of printing clearly each single color of the two colors. CONSTITUTION: Though two color thermal recording paper 10 of a leucodiazo type has a black-coloring paper 1 which colors black when low energy (comparatively low temperature) is added from a thermal head, and a red-coloring part 2 which colors red when high energy (high temperature) is added, a coloring- inhibitor which inhibits coloring of black is coated on the red-coloring part 2. Therefore when heat energy is applied to the thermal recording paper 10 with the thermal head, black is colored as conventionally in the black coloring part 1 to which low energy is added. However, in the red-coloring part 2 to which high energy is added, coloring of black is thoroughly suppressed by an influence from the coloring inhibitor, and only red is colored. Further, the coloring inhibitor suppresses coloring of black by reacting on a heat-sensitive layer of coloring black, and functions in the same way as desensitizing ink in no- carbon copying paper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive recording sheet for heat-sensitive recording based on heat energy supplied from a thermal head, and more particularly to heat-sensitive recording of a plurality of colors based on a plurality of energy levels supplied from the thermal head. The present invention relates to a heat sensitive recording paper.

[0002]

2. Description of the Related Art In recent years, a thermal recording system in which a thermal head in which heating elements are arranged is brought into contact with a thermal recording medium to cause a physical change or a chemical change due to thermal energy to obtain a recorded image has become widespread.

By the way, the heat-sensitive recording paper as a recording medium in this case is prepared by dispersing a color former in a resin binder and coating it on the paper, but two kinds of heat-sensitive layers which develop different colors depending on the energy level. There is also a two-color thermosensitive recording paper provided with.

For example, in the case of a leuco-diazo type two-color thermosensitive recording paper which is one of the two-color thermosensitive recording papers of this kind, a portion to which low energy is applied from the heating element of the thermal head develops black color and high energy is generated. The added part develops red color.

[0005]

However, in the conventional two-color thermal recording paper as described above, as shown in FIG.
Applying high energy to make red color develop red 12
When the number "1" is drawn with, low energy is added around the high-energy portion, and black coloring 11 occurs around red coloring 12, and red coloring 12 is outlined by black coloring 11. Looks like. Further, in the case of solid color development, in addition to the edging, the solid part color is mottled, and there is a problem that each of the two monochromatic colors is not clear.

The present invention has been made in view of the conventional problems as described above, and an object of the present invention is to provide a thermal recording paper which can clearly print each single color.

[0007]

In order to achieve the above object, the invention of claim 1 provides a thermal recording paper capable of thermal recording of a plurality of colors according to a plurality of energy levels supplied from a thermal head. The coloring area at the energy level is characterized by being coated with a coloring preventing agent for preventing coloring at an energy level lower than the energy level.

According to a second aspect of the present invention, in the heat-sensitive recording paper according to the first aspect, the high and low 2 supplied from the thermal head is used.
When two or more colors of red, blue, and black are recorded according to the energy level of the species, one color develops at a high energy level and the other color develops at a low energy level. .

[0009]

In the present invention, since the color development inhibitor that prevents color formation at a low energy level is applied to the color development region at a high energy level, even if low energy is applied to the color development region at a high energy level, a low energy is applied. Color development at the level is prevented.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The same components as those used in the description of the above-mentioned conventional example will be described with the same reference numerals.

FIG. 1 is a plan view showing a schematic structure of a thermal recording paper to which the present invention is applied.

In FIG. 1, 10 is a two-color type thermal recording paper, for example, a leuco-diazo type two-color thermal recording paper can be used. The thermal recording paper is prepared by dispersing a color former in a resin binder and coating it on the paper.
It is a thermosensitive recording paper provided with two types of thermosensitive layers having different coloring temperatures and colors. The part to which low energy is applied from the thermal head is colored black and the part to which high energy is applied is colored red.

In FIG. 1, 1 is a black coloring portion,
2 is a red colored part.

By the way, in this embodiment, the red coloring portion 2
A color-developing preventing agent (not shown) for preventing the coloration of black is applied to the.

Incidentally, in this embodiment, the color-developing agent suppresses color development by reacting with the heat-sensitive layer at low energy.
It works like desensitizing ink on carbonless copy paper.

The configuration of the present embodiment has been described above. Next, its operation will be described with reference to FIGS. 1 and 2.

In this embodiment, the red coloring portion 2 of the two-color thermosensitive recording paper 10 is coated with a coloring preventing agent for preventing the coloring of black.

Therefore, when thermal energy is applied to the thermal recording paper 10 by a thermal head (not shown), black is produced in the black coloring portion 1 to which low energy is applied as usual, but in the red coloring portion 2 to which high energy is applied. , Black color is completely suppressed due to the effect of the color development inhibitor,
Only red color develops.

FIG. 2 is a diagram showing the printing result of the thermosensitive recording paper 10 in this case. In the black color portion 1, "ABCD" is shown.
In addition to the black color development 11, the red color development 12 clearly obtains the red color development 12 of "1234".

In the above description, the two-color thermosensitive recording paper 1 is used.
0 is used to add high energy to the red coloring part 2
In the above, the case of applying a color-developing preventing agent for preventing the color development of black has been described, but the present invention is not limited to these, and can be applied to recording papers which are heat-sensitively recorded with a plurality of colors having different coloring temperatures.

For example, in a three-color thermosensitive recording paper capable of developing three colors depending on the energy level of the thermal head, the color developing area of the color having the highest energy level and the color developing area of the color having the second highest energy level are developed. It is advisable to apply an inhibitor.

Further, as described above, in the present embodiment, each single color can be obtained clearly, and therefore it is suitable for printing that requires precision such as bar code printing.

[0023]

As described above, according to the present invention, the color forming inhibitor for preventing color formation at the low energy level is applied to the color development region at the high energy level.
Even if low energy is applied to the color development region at a high energy level, color development at a low energy level is prevented.

Therefore, there is an effect that it is possible to obtain a heat-sensitive recording paper on which each single color can be clearly printed.

[Brief description of drawings]

FIG. 1 is a plan view showing a schematic configuration of a two-color thermal recording paper according to the present invention.

FIG. 2 is a plan view when heat-sensitive recording is performed on the heat-sensitive recording paper shown in FIG. 1, and an operation explanatory view of the present invention.

FIG. 3 is an explanatory diagram of a high energy application portion when heat-sensitive recording is performed on a conventional two-color type heat-sensitive recording paper.

[Explanation of symbols]

 1 Black coloring part 2 Red coloring part 10 Thermal recording paper 11 Black coloring 12 Red coloring

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[Procedure amendment]

[Submission date] March 6, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

FIG.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Claims (2)

[Claims] 1. A thermosensitive recording paper capable of thermosensitive recording of a plurality of colors according to a plurality of energy levels supplied from a thermal head, wherein a coloring region at each energy level is colored at an energy level lower than the energy level. A heat-sensitive recording paper, which is coated with an anti-coloring agent that prevents 2. When thermal recording of two colors of red, blue, and black is performed according to the energy levels of two types of high and low supplied from the thermal head, one color is produced at a high energy level and the other color is produced. The thermosensitive recording paper according to claim 1, wherein the color develops at a low energy level.