JPH04142976A - Discharge breakdown recording medium - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a recording medium destroyed by electrical discharge, and in particular, a recording medium in which a visible hologram image existing in the underlying layer appears due to electrical discharge, and further the hologram-forming resin layer is destroyed by electrical discharge. The present invention relates to a discharge destruction recording medium that can perform recording using the following methods.

<Prior Art> In recent years, visually visible information (hereinafter referred to as visible information) has been recorded on the surface of a card for the convenience of card holders. In particular, with respect to prepaid cards that have a magnetic recording layer, it has become possible to visually see the same value information as magnetically recorded cards without using a reader.

Conventionally, a method using a thermosensitive coloring layer has been adopted as a method for visualizing value information, but a thermosensitive recording layer that uses the conventional thermochromic action can be visually visualized on a magnetic recording medium that has a magnetic recording layer. As a means for recording on the magnetic recording layer, methods have been used to provide it on the substrate opposite to the magnetic recording layer, or to provide it in a portion that does not overlap with the magnetic recording layer. For this reason, when the surface of the magnetic recording layer occupies a large area, it is necessary to pre-print visible information such as characters and patterns, and when the visible information is later recorded using a thermal head, etc., there is a disadvantage in that the recording space is restricted. .

Therefore, JP-A-52-114333, JP-A-59-1
As described in Japanese Patent No. 99285, there has been proposed a heat-sensitive magnetic recording medium in which a heat-sensitive recording layer is formed directly on a magnetic recording layer.

<Problems to be Solved by the Invention> However, the purpose of the above visual information is simply to make the balance information visible, and does not itself have security.

Further, most of the information that can be handled by the above method is monochrome character information, and it is almost impossible to provide multicolor image information, especially three-dimensional image information such as a hologram image.

The present invention was made in order to solve the above-mentioned problems.A hologram-forming resin layer is provided on a base, and two metal thin film layers are provided on top of the resin layer with the resin layer sandwiched therebetween, and a hologram is formed by electric discharge. It is an object of the present invention to provide a discharge destruction recording medium in which three-dimensional image information of an image appears.

<Means for Solving the Problems> To achieve the above-mentioned object, the present invention includes a hologram-forming resin layer, a first metal thin film layer,
This is a discharge rupture recording medium formed by sequentially laminating an intermediate resin layer and a second metal thin film layer.

<Operation> According to the present invention, it is possible to provide a discharge breakdown recording medium in which three-dimensional image information of a hologram image appears through discharge breakdown recording.

<Detailed Description of the Invention> FIG. 1 is a partially enlarged sectional view of the discharge rupture recording medium (1) of the present invention, in which at least a hologram-forming resin layer (3) and a first metal thin film layer are provided on a substrate (2). (4), an intermediate resin layer (5), and a second metal thin film layer (6).

A protective layer (7) for protecting the second metal thin film layer (6)
) may be provided as necessary. Further, if necessary, a magnetic recording layer can be provided on a part or the entire surface of the base (2). Furthermore, each layer can be formed using an adhesive, if necessary.

As the substrate (2), plastics such as polyvinyl chloride, polyester, polycarbonate, polymethyl methacrylate, and polystyrene, paper, and synthetic paper can be used alone or as a composite.

The substrate (2) can be selected from the above-mentioned materials, taking into consideration the physical properties required depending on the use of the recording medium, such as a card or a sheet, such as strength, rigidity, hiding property, light opacity, etc. . When providing a magnetic recording layer, for example, r F
ezes Co adhesion y-t” et o, , Fe3
04 Chrom, Fe, FeCr, Fe-Co,
A magnetic paint made of a dispersion of magnetic fine particles such as Co-Cr-Co-Ni, MnAl, Ba ferrite, Sr ferrite, etc. is applied.

- The coercive force of the magnetic recording layer used in magnetic recording media such as prepaid cards for boat fishing is 300 to 3000 (Oe), and the residual magnetic flux is 1. 0-2. 0 (Maxwel+/cm
).

The hologram-forming resin layer (3) is made of an ink made of, for example, acrylic resin, urethane resin, cellulose acetate resin, nitrocellulose resin, etc., and has a thickness of 0.5 to 4 μm. When forming a hologram image on this layer, if the hologram is a relief hologram that records hologram information through surface irregularities, a hologram master plate with interference fringes recorded in the form of irregularities is used as a press mold, and the above-mentioned resin is used. It is formed by heating and pressing the layer surface. Examples of holograms include Fraunhofer holograms, rainbow holograms, and holographic stereo durams.

The first metal-based thin film layer (4) is, for example, a vapor-deposited layer of non-magnetic metal having a thickness of about 0.03 to 0.1 μm, and is specifically made of aluminum, tin, or the like.

As a forming method, a vacuum evaporation method, a sputtering method, an ion blating method, etc. are employed.

The intermediate resin layer (5) is formed by coating an ink of, for example, acrylic resin, urethane resin, cellulose acetate resin, nitrocellulose resin, etc. to a thickness of 0.5-
It is formed to have a thickness of 4 μm.

The metal forming the second metal thin film layer (6) is
It may be the same as the first metal thin film layer (4), and is made of aluminum or the like, which can be destroyed by electric discharge. This layer is formed by vacuum evaporation method, Schuttering method, ion blating method, etc., and its thickness is 0.03-0.1 μm.
Let it be m.

Furthermore, a protective layer (7) may be provided for the purpose of protecting the second metal thin film layer (6). The protective layer (7) may be formed by selecting an appropriate resin from the above resins, converting it into ink, and coating it.

It is also possible to add a lubricant to this protective layer (7) for the purpose of further improving discharge recording suitability.

<Example> Examples of the present invention are shown below. In addition, "part" in each example
indicates parts by weight.

<Example 1> On a white PET sheet with a thickness of 188 μm, a urethane resin was applied to a thickness of 2 μm using a gravure coating method to form a hologram-forming resin layer. Next, this hologram-forming resin layer was dried and cured, and then embossed with a hologram stamper at 150° C. to form a hologram image. Next, 0.05 μm of aluminum was applied to the hologram forming resin layer on which this hologram image was formed.
A first metal deposition layer was formed by vacuum deposition to a thickness of m. Next, an acrylic resin is applied to a thickness of 2 μm, and aluminum is deposited to a thickness of 0.05 μm using a vacuum evaporation method on top of the resin to form an intermediate resin layer and a second metal deposition layer, thereby forming a discharge breakdown recording medium. Obtained.

In this discharge destruction recording medium, the hologram was completely hidden by the second metal vapor deposited layer.

Furthermore, when this recording medium was subjected to a discharge with an applied voltage of -50V, the second metal vapor deposition layer was destroyed, and the image information of the hologram hidden underneath was able to appear.

<Example 2> (1) Coating liquid composition of conductive intermediate resin layer Acrylic modified resin 10 parts Hardening agent
3 parts toluene
5 parts MIBK (methyl iso butyl ketone) 5
1 part silver powder 1 part thickness
A black colored layer was formed by coating a vinyl chloride-nitrocellulose binder mixed with carbon black on an 88 μm white PET sheet. Next, a urethane resin was applied to a thickness of 2 μm using a gravure coating method to obtain a hologram-forming resin layer. After drying and curing this,
A hologram image was formed on the hologram-forming resin layer by enphos treatment using a hologram stamper at 150°C. Next, aluminum was deposited to a thickness of 0.05 μm by vacuum deposition to form a first metal deposited layer. Next, a coating liquid for a conductive intermediate resin layer having the composition (1) was applied to a thickness of 2 μm to form a conductive intermediate resin layer. Aluminum was deposited thereon to a thickness of 0.05 μm by vacuum deposition to form a second metal deposition layer, thereby obtaining a discharge breakdown recording medium.

This discharge rupture recording medium was able to completely hide the hologram by forming the second metal vapor deposition layer.

When this recording medium is discharged with an applied voltage of -50V, the second
The metal vapor deposited layer was destroyed, and the hologram image hidden beneath it was able to appear.

Further, by discharging at an applied voltage of -50 Å, the conductive intermediate resin layer and the first metal vapor deposited layer were destroyed, and information could be recorded due to the appearance of a colored layer formed on the PET sheet.

<Example 3> On a white PET sheet with a thickness of 188 μm, a mixture of urethane resin and carbon black was applied to a thickness of 2 μm using a gravure coating method to obtain a colored hologram-forming resin layer. After drying and curing this, a hologram image was formed on the colored hologram J-forming resin layer by embossing with a hologram stamper at 150°C. Next, aluminum was deposited to a thickness of 0.05 μm by vacuum deposition to form a first metal deposited layer. Next, a coating liquid for a conductive intermediate resin layer having the composition described in Example 2 was applied to a thickness of 2 μm to form a conductive intermediate resin layer. Aluminum was deposited thereon to a thickness of 0.05 μm by vacuum deposition to form a second metal deposition layer, thereby obtaining a discharge breakdown recording medium.

This discharge rupture recording medium was able to completely hide the hologram by forming the second metal vapor deposition layer.

When this recording medium is discharged with an applied voltage of -50V, the second
The metal vapor deposited layer was destroyed, and the hologram image information hidden beneath it was able to appear. Furthermore, by discharging at an applied voltage of -50 Å, the conductive intermediate resin layer and the first metal vapor deposited layer were destroyed, and information could be recorded due to the appearance of a colored hologram-forming resin layer.

<Effects of the Invention> As explained above, the discharge destruction recording medium according to the present invention can completely hide the hologram by forming the second metal vapor deposited layer, and can record by destroying it by discharge. It is possible.

At this time, the image information of the hologram hidden in the lower layer can be made to appear by causing discharge destruction with a small voltage, and information can be recorded by causing discharge destruction with a large voltage. Furthermore, it is possible to improve the decorativeness and prevent forgery, and it becomes extremely easy to identify the recording medium.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged sectional view showing the structure of a discharge rupture recording medium according to the present invention. (1)...Discharge breakdown recording medium (2)...Substrate (3)...Hologram forming resin layer (4)...First metallic thin film layer (5)...Intermediate resin layer ( 6)...Second metallic thin film layer (7)...Protective layer patent applicant Kazuo Suzuki, Representative of Toppan Printing Co., Ltd.

Claims (1)

[Claims] 1) A hologram-forming resin layer, a first
A discharge rupture recording medium characterized in that it is formed by sequentially laminating a metal thin film layer, an intermediate resin layer, and a second metal thin film layer. 2) The discharge breakdown recording medium according to claim 2, wherein the intermediate resin layer has electrical conductivity. 3) The discharge rupture recording medium according to claim 1, further comprising a colored layer provided between the hologram-forming resin layer and the substrate. 4) The discharge rupture recording medium according to claim 1, wherein the hologram-forming resin layer is colored.