阅读说明：本技术 可逆记录介质 (Reversible recording medium ) 是由 高桥功 浅冈聡子 竹内太一 手岛飞鸟 栗山健太朗 星光成 于 2018-05-11 设计创作，主要内容包括：根据本公开内容的实施方式的可逆记录介质中具有交替地堆叠的记录层和绝热层,其中所述记录层包括可逆热敏着色组合物和第一光热转换剂。在该可逆记录介质中,记录层的各可逆热敏着色组合物的着色色调不同,并且各第一光热转换剂的吸收波长不同。该可逆记录介质进一步包括发热层,所述发热层包括第二光热转换剂,所述第二光热转换剂的吸收波长不同于各记录层中包括的第一光热转换剂的吸收波长。(A reversible recording medium according to an embodiment of the present disclosure has a recording layer and a heat-insulating layer alternately stacked therein, wherein the recording layer includes a reversible thermosensitive coloring composition and a first photothermal conversion agent. In the reversible recording medium, the reversible thermosensitive coloring composition of the recording layer is different in coloring tone and the first photothermal conversion agent is different in absorption wavelength. The reversible recording medium further includes a heat-generating layer including a second photothermal conversion agent having an absorption wavelength different from that of the first photothermal conversion agent included in each recording layer.)

1. A reversible recording medium comprising recording layers and a heat-insulating layer which are alternately stacked, the recording layers each comprising a reversible thermosensitive coloring composition and a first photothermal converter, the coloring tone of each reversible thermosensitive coloring composition of the recording layer being different from each other, and the absorption wavelength of each first photothermal converter of the recording layer being different from each other,

the reversible recording medium further includes a heat-generating layer including a second photothermal conversion agent having an absorption wavelength different from that of the first photothermal conversion agent included in each recording layer.

2. The reversible recording medium according to claim 1, wherein the heat generating layer serves as an overcoat layer of the reversible recording medium.

3. The reversible recording medium according to claim 1, further comprising: a substrate supporting the recording layer and the heat insulating layer; and a primer layer in contact with a surface of the substrate,

wherein the heat generating layer serves as the base layer.

4. The reversible recording medium according to claim 1, wherein the absorption wavelength of the second photothermal conversion agent is a wavelength higher than the absorption wavelength of the first photothermal conversion agent included in each recording layer.

5. A reversible recording medium comprising recording layers and a heat-insulating layer which are alternately stacked, the recording layers each comprising a reversible thermosensitive coloring composition and a first photothermal converter, the coloring tone of each reversible thermosensitive coloring composition of the recording layer being different from each other, and the absorption wavelength of each first photothermal converter of the recording layer being different from each other,

at least one of the at least one or more heat insulating layers of the plurality of recording layers includes a second photothermal conversion agent having an absorption wavelength different from an absorption wavelength of the first photothermal conversion agent included in each recording layer.

6. The reversible recording medium according to claim 5, wherein the absorption wavelength of the second photothermal conversion agent is a wavelength higher than the absorption wavelength of the first photothermal conversion agent included in each recording layer.

Technical Field

The present disclosure relates to a reversible recording medium.

Background

Thermal recording media using thermosensitive coloring compositions such as leuco dyes have been widely used. Such recording media include irreversible recording media that do not allow erasure once written and reversible recording media that allow multiple rewrites, and they are now in practical use. For example, information is written to the reversible recording medium by a writing device including a light source for writing, and information is erased from the reversible recording medium by an erasing device including a light source for erasing. At this time, the erasing device uses a light source having the same wavelength as that of the light source for writing (for example, see patent document 1).

Reference list

Patent document

Patent document 1: japanese unexamined patent application publication No. 2011-104995

Disclosure of Invention

In the case of realizing full-color recording in a reversible recording medium, for example, it is necessary that the recording layer includes coloring materials that produce three primary colors, one for each primary color. At this time, it is conceivable to provide one light source for erasing for each recording layer. However, in this case, the number of light sources increases, and thus the erasing process tends to become complicated. Therefore, it is desirable to provide a reversible recording medium that makes it possible to simplify the erasing process.

The first reversible recording medium according to an embodiment of the present disclosure is a reversible recording medium including recording layers and a heat-insulating layer that are alternately stacked, wherein each of the recording layers includes a reversible thermosensitive coloring composition and a first photothermal converter, and the recording layers are different from each other in a coloring tone of their respective reversible thermosensitive coloring compositions and are different from each other in an absorption wavelength of their respective first photothermal converters. The first reversible recording medium further includes a heat generating layer including a second photothermal conversion agent having an absorption wavelength different from that of the first photothermal conversion agent included in each recording layer.

A first reversible recording medium according to an embodiment of the present disclosure is provided with a heat generating layer including a second photothermal conversion agent having an absorption wavelength different from that of a first photothermal conversion agent included in each recording layer. Therefore, for example, by irradiating the second photothermal conversion agent with laser light having the same wavelength as the absorption wavelength of the second photothermal conversion agent, erasing of all recording layers can be collectively performed.

The second reversible recording medium according to an embodiment of the present disclosure is a reversible recording medium including recording layers and a heat-insulating layer that are alternately stacked, wherein each of the recording layers includes a reversible thermosensitive coloring composition and a first photothermal converter, and the recording layers are different from each other in a coloring tone of their respective reversible thermosensitive coloring compositions and are different from each other in an absorption wavelength of their respective first photothermal converters. In the second reversible recording medium, at least one of the at least one or more heat insulating layers of the plurality of recording layers includes a second photothermal conversion agent having an absorption wavelength different from that of the first photothermal conversion agent included in each recording layer.

In the second reversible recording medium according to an embodiment of the present disclosure, at least one of the at least one or more heat insulating layers of the plurality of recording layers includes a second photothermal conversion agent having an absorption wavelength different from an absorption wavelength of the first photothermal conversion agent included in each recording layer. Therefore, for example, by irradiating the second photothermal conversion agent with laser light having the same wavelength as the absorption wavelength of the second photothermal conversion agent, erasing of all recording layers can be collectively performed.

According to the first and second reversible recording media of the embodiments of the present disclosure, for example, by irradiating the second photothermal conversion agent with laser light having the same wavelength as the absorption wavelength of the second photothermal conversion agent, erasure of all the recording layers can be collectively performed; therefore, the erasing process can be simplified. It should be noted that the effects of the present disclosure are not necessarily limited to those described herein, and may be any effects described in the present specification.

Drawings

Fig. 1 is a diagram showing a cross-sectional configuration example of a reversible recording medium according to an embodiment of the present disclosure.

Fig. 2 is a diagram illustrating a configuration example of layers included in the reversible recording medium shown in fig. 1.

Fig. 3 is a graph showing an example of the absorption wavelength of each of the photothermal conversion agents included in the reversible recording medium shown in fig. 1.

Fig. 4 is a graph showing an example of a change in temperature of each layer with time when the photothermal conversion agent in the protective layer is caused to generate heat.

Fig. 5 is a diagram showing an example of a temperature distribution of the reversible recording medium in the thickness direction when the photothermal conversion agent in the protective layer is caused to generate heat.

Fig. 6 is a diagram showing a modification of the arrangement of layers included in the reversible recording medium shown in fig. 1.

Fig. 7 is a graph showing an example of a change in temperature of each layer with time when the photothermal conversion agent in the heat insulating layer is caused to generate heat.

Fig. 8 is a diagram illustrating an example of a temperature distribution of the reversible recording medium in the thickness direction when the photothermal conversion agent in the heat insulating layer is caused to generate heat.

Fig. 9 is a diagram showing a modification of the arrangement of layers included in the reversible recording medium shown in fig. 1.

Fig. 10 is a graph showing an example of a change in temperature of each layer with time when the photothermal conversion agent in the underlayer is caused to generate heat.

Fig. 11 is a diagram illustrating an example of a temperature distribution of the reversible recording medium in the thickness direction when the photothermal conversion agent in the underlayer is caused to generate heat.

Fig. 12 is a diagram illustrating a modification of the arrangement of layers included in the reversible recording medium shown in fig. 1.

Detailed Description

Hereinafter, embodiments of the present disclosure are described in detail with reference to the accompanying drawings. The following description is a specific example of the present disclosure, and the present disclosure is not limited to the embodiments described below. It should be noted that the description is made in the following order.