JP3347192B2 - Visible recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a commuter pass, an admission permit,
The present invention relates to a visible recording medium capable of repeatedly displaying and erasing a visible image on a repeatedly used recording medium such as various prepaid cards.

[0002]

2. Description of the Related Art A commuter pass for transportation, a permit for entering an event site or a building, and the like are repeatedly used every day, but there is no means for checking illegal riding and unauthorized entry in management. recent years,
Although a check method using a magnetic card is being adopted in some cases, since the presence or absence of the check cannot be visually observed, there is a possibility that the check may be leaked due to a trouble on the apparatus, and both the administrator and the user feel inconvenience. Magnetic cards and IC cards are also used in various prepaid cards. However, since the recorded contents cannot be directly viewed, the amount of payment and the balance cannot be easily checked, and there is a problem in guaranteeing the contents to the user. .

[0003] For this reason, conventionally, there has been proposed a method of making a recordable image on a recording medium and erasing it. For example, an organic low-molecular substance is dispersed in a synthetic resin base material,
It has been proposed to use a material that changes between a transparent state and an opaque (opaque) state depending on the temperature (Japanese Patent Laid-Open No. 55-154198). This material becomes transparent when cooled to room temperature from a specific temperature range T _1, since it has the property of cloudy when cooled from a high temperature region T ₂ to room temperature than T _1, the visible image using it Printing and erasing can be performed reversibly.

[0004]

In the method of recording by the reversible change between the transparent state and the opaque state, an image is formed by the contrast between the transparent part and the opaque part of the recording layer. Unless both the transparency and the hiding power in the opaque state are large, it is difficult to obtain a clear image. It is known to provide a metal light-reflective layer below the recording layer in order to increase the sharpness of the image, but it was still insufficient in some cases.

[0005]

SUMMARY OF THE INVENTION The present invention solves this problem, and provides a visible recording medium in which an image is easy to see. In a visible recording medium having a recording layer that causes a change, a light reflecting layer is provided below the recording layer, and a transparent coloring layer is provided between the recording layer and the light reflecting layer or on the recording layer. This is a visible recording medium.

Accordingly, when a transparent colored layer is provided between the recording layer and the light reflecting layer, the transparent portion of the recording layer becomes a colored background and the cloudy portion becomes white, so that the contrast is reduced. A clear and highly visible image is formed. When a transparent colored layer is provided on the recording layer,
The present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view of an example of the visible recording medium (card) of the present invention, and FIG.
FIG. 4 is a sectional view of another example of the visible recording medium of the present invention. FIG.
Reference numeral 1 denotes a substrate made of a synthetic resin such as a polyethylene terephthalate sheet or paper or the like, on which a light reflecting layer 2 is provided by aluminum evaporation or the like, and a transparent coloring layer 3 and a recording layer 4 are sequentially laminated thereon. Then, a protective layer 5 is further formed and punched into a card shape. On the card surface,
A display printing surface 6 and a record display window 7 are provided. Generally, an information recording layer such as a magnetic recording layer is provided at an appropriate position.

In the recording medium thus prepared, the recording area of the recording display window 7 is first heated to T ₁ ° C. by a heating means such as a heating stamp to make the entire recording area transparent. Next, T ₂ ° C (T ₂
When a character or the like is partially heated in> T ₁ ), only the character portion becomes cloudy, and a display image appears. In the image obtained in this manner, opaque white characters and the like emerge with good contrast against the colored reflective layer 2 as a background, and a display with high visibility can be obtained. Further, the printing thus obtained can be repeatedly erased and printed again by the same operation. In the example shown in FIG. 2, the transparent coloring layer 3 is provided on the recording layer 4. In this case, the transparent coloring layer 3 can be made of a material having high heat resistance, and can also serve as a protective layer.

In the present invention, the resin constituting the recording layer 4 includes polyvinyl chloride, a vinyl chloride-vinyl acetate copolymer, another vinyl acetate compound, a vinyl chloride copolymer,
Polyvinylidene chloride, a vinylidene chloride-based copolymer, polyester, polyamide, polystyrene, polymethyl (meth) acrylate or a copolymer thereof is preferable.

[0009] Examples of the organic low-molecular substance to be opaque and transparent include carboxylic acids, dicarboxylic acids, ketones, ethers, alcohols, and derivatives thereof. When these materials are heated to, for example, 70 to 100 ° C. (T ₁ ) and cooled to room temperature, they maintain a transparent state.
When heated to a temperature exceeding (T ₂ ) and cooled to room temperature, it becomes cloudy.

The reflective layer 2 is preferably a vapor deposited layer of a metal such as aluminum, silver or tin, a foil of aluminum or the like, or a film of a paint mixed with a metal powder such as aluminum powder. The transparent colored layer 3
A material obtained by adding a small amount of a coloring agent to a transparent resin having good adhesion to the recording layer 4 and the light reflecting layer 2 can be used. Further, the protective layer 5 can be formed by a method such as application of an ultraviolet curable paint or bonding of a heat-resistant film such as polyethylene terephthalate, polyetherimide, polyetheretherketone, polyphenylene sulfide, or polyarylate.

The recording medium of the present invention can be used, for example, as a prepaid card for entrance, shopping, rental, and the like. You can know the exact balance. Further, it can be used as various heat-sensitive recording papers.

[0012]

【Example】

(Example) A transparent polyethylene terephthalate resin sheet having a thickness of 188 μm was used as the card substrate 1, and the surface thereof was subjected to aluminum vapor deposition to form the light reflection layer 2. Then, a transparent coloring layer 3 obtained by adding a coloring agent to a vinyl chloride-vinyl acetate copolymer described below was coated thereon to a thickness of 1 μm, and a recording layer 4 was coated thereon to a thickness of 10 μm.

As a material constituting the recording layer, a vinyl chloride-vinyl acetate copolymer (MRP-TS, Nissin Chemical Co., Ltd.) 100 parts by weight 12-tricosanone 40 parts by weight 1,12-tetradecandioic acid 10 parts by weight Was applied on the transparent colored layer 3 and dried by heating to a thickness of 10 μm. A UV-curable transparent protective film 5 was coated thereon to a thickness of 3 μm, printed and displayed with the record display window 7 left, and punched into a card to produce the product of the present invention having the structure shown in FIG.

Using the card thus obtained, 8
When the display window 7 was heated with a heating stamp of 0 ° C. to make the display portion transparent, the light reflection layer 2 was visually observed. Next, 8 dots / mm
When a character was printed with an energy of 0.25 mJ / dot by using a thermal head, the printed portion of the recording layer 4 became cloudy, white characters appeared on the background colored by the colored layer 3, and the image was highly visible. was gotten.

A card having the structure shown in FIG. 2 was prepared from the same material and evaluated similarly. As a result, an image having high visibility was obtained.

[0016]

As described above, the visible recording medium of the present invention can be provided with a combination of a light reflecting layer and a transparent coloring layer on a substrate to provide a contrast between a colored transparent portion and a white turbid portion, or With the contrast between the colored transparent portion and the colored cloudy portion, it is possible to display a visible image with higher visibility than that provided simply with the light reflection layer.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an example of the visible recording medium of the present invention.

FIG. 2 is a sectional view of another example of the visible recording medium of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Light reflection layer 3 Transparent coloring layer 4 Recording layer

Claims (1)

(57) [Claims] 1. A visible recording medium having a recording layer which reversibly changes between a transparent state and an opaque state depending on temperature on at least a part of a base material, wherein a light reflecting layer is provided below the recording layer, and A visible recording medium comprising a transparent coloring layer provided between the light reflecting layer and the recording layer.