JP3198324B2 - Recording medium and recording method of recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium, such as a prepaid card or a credit card, capable of preventing unauthorized use, and a recording method of the recording medium.

[0002]

2. Description of the Related Art Counterfeiting prevention means is applied to cards such as credit cards which are frequently used as payment means instead of cash.

For example, magnetic recording for identification is performed on a card, an identification number is provided on the surface of the card by embossing, or processing for adding a hologram to the card is performed. In addition, as a means for identifying and confirming that the owner is a card such as a credit card, the signature of the owner is also recorded.

[0004]

According to the above-described counterfeiting means such as a credit card, it is possible to prevent the creation of a fake card. However, except for the handwriting of the signature, the card user is required to possess the card. It is not a means of confirming identity.

[0005] However, since a signature is originally recorded on a card, a person other than the owner can imitate and write while visually recognizing the signature, which makes it difficult to prevent unauthorized use of the cards. have.

[0006] As described above, in order to prevent unauthorized use of a credit card or the like by another person, the name of the card owner himself or herself is irrevocably written on the credit card or the like.
It is desirable to record personal attribute information such as date of birth, age, gender, and face photograph.

[0007] If the attribute information of these individuals can be recorded in a form that is not normally visible, it is more effective to create a card having excellent functions without hindering the design of the card. Is possible.

As such a method, for example, it is conceivable to print personal attribute information on the upper surface of the card or inside thereof using a transparent fluorescent ink. However, it is necessary to perform different printing for each card. It is troublesome and has the problem of being impractical.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a recording medium in which personal attribute information is recorded in a form that is difficult to see in a normal state.

The present invention also relates to a recording medium capable of relatively easily recording information that is difficult to visually recognize in a normal state by partially removing a recording layer of a recorded unrecorded recording medium. To provide a recording method.

[0011]

According to the present invention, there is provided a recording medium comprising a substantially transparent material containing a substance which emits fluorescent light by irradiating ultraviolet light on a part or the whole of the outermost surface of a substrate. A recording layer is provided, and the attribute information of the individual is recorded by a fluorescent light emission pattern in which the recording layer is partially removed so that it is difficult to see under general illumination.

A light reflecting layer may be provided between the substrate and the recording layer.

The attribute information recorded by the fluorescent pattern may be an individual's photograph, date of birth, gender, age, and the like.

Further, the recording layer may be an overcoat layer for protecting the recording medium.

Further, according to the recording method of a recording medium of the present invention, a substantially transparent recording layer containing a substance which emits fluorescence by irradiation with ultraviolet light is provided on a part or the whole of the outermost surface of the base material, By partially removing the recording layer by ablation removal using a technique, a fluorescent light emission pattern in which personal attribute information is hardly seen under general illumination is formed.

A light reflecting layer may be provided between the substrate and the recording layer.

[0017]

The recorded fluorescence emission pattern is substantially transparent when viewed by a human under natural light, and the color appearance of the recorded body is the same as that of an unrecorded one, so that it is difficult to visually check it. When ultraviolet light is irradiated, light is emitted from portions other than the portion of the fluorescent light emitting pattern portion from which the layer containing the substance that emits fluorescent light is removed, so that information based on the pattern can be clearly recognized.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment of a recording medium according to the present invention. FIG. 1 is a cross-sectional view of a recording medium on which a fluorescent light emission pattern is not recorded, and FIG. 2 shows a cross-sectional view of the recording medium after recording. The card substrate 1 serves as a carrier of the card, and is made of polyvinyl chloride resin, polyethylene terephthalate resin, ABS resin, AS resin, polysulfone resin, polycarbonate resin, polyimide resin, acrylic resin represented by polymethyl methacrylate, or the like. A film or a sheet made of the above polymer material can be used, and a pigment or the like is kneaded to obtain a required color or density.

In this embodiment, the base material having a thickness of 188 μm is used.
m, a pattern printing layer 2 is formed on one surface of the polyethylene terephthalate film 1 by a known printing method, and a magnetic recording layer 4 is formed on the other surface of the film by a method such as coating using a magnetic material. is there.

Next, a recording layer 3 containing a substance which emits fluorescence by irradiation with ultraviolet light is formed on the upper surface of the pattern printing layer 2. Examples of the substance that emits fluorescence include a fluorescent whitening agent and a fluorescent dye. Recording layer 3 containing the fluorescent substance
Is preferably used as a protective layer, and if it is formed of a transparent material, it is possible to form a recording which is difficult to visually recognize in a normal state after recording. In this example, a UV curable ink dicure manufactured by Dainippon Ink and Chemicals, which was kneaded with 10% of fluorescent pigment GOF-B manufactured by Nemoto Special Chemical Co., was applied to a thickness of 1 μm to form a coating.

When the recording layer 3 is provided on the upper surface of the magnetic recording layer 4, since the magnetic recording layer 4 has a low light reflectance and a low fluorescence emission efficiency, a white pigment such as titanium white is included on the upper surface. It is preferable to provide the light reflecting layer 5 such as an ink layer or a metal thin film layer of aluminum or the like, and then stack the recording layer 3 containing the fluorescent substance.

FIG. 5 is a diagram showing a process of recording a fluorescence emission pattern. As a method of recording the fluorescence emission pattern, there is a method of mechanically removing a recording layer containing a substance that emits fluorescence, a method of removing ablation using an excimer laser, and the like. Adjusting the strength and the energy is preferable because the finish is beautiful and the processing can be performed in a short time.

Using an optical system as shown in FIG. 5, a recording layer containing a substance which emits fluorescence by irradiating one pulse of 308 nm ultraviolet light with an energy of 500 mJ / cm ² on an image forming surface by an excimer laser (XeCl) 6 The information is recorded on the sample 3 by ablation removal, and a fluorescent light emission pattern as shown in FIG. 2 is created. The portion indicated by reference numeral 3A in the figure is a portion from which the recording layer containing a substance that emits fluorescence is removed.

Although this fluorescence emission pattern could hardly be seen under the irradiation of general illumination light, a weak ultraviolet lamp for reading (for example, a black lamp Model UVL-56 manufactured by San Gabriel) was used. Upon irradiation with ultraviolet light, a fluorescent light-emitting pattern that emits fluorescent light was visually recognized at a portion other than the portion 3A from which the recording layer containing the substance that emitted fluorescent light by ablation removal was removed.

The recording medium 12 thus created is
Before and after the irradiation of the weak ultraviolet light for checking, no change was observed in the appearance under general illumination visually.

In the above recording method, attribute information such as the name, gender, date of birth, and face photograph of an individual can be easily obtained by moving the beam of an excimer laser or by using a mask pattern in which the information is recorded in advance. A card recording personal information can be formed.

In the embodiment shown in FIGS. 2 and 4, a recording layer containing a substance which emits fluorescent light is provided on the entire surface of the base material of the recording medium. Needless to say, the configuration may be provided in the section.

Further, the recording medium and the recording method of the present invention
The present invention is not limited to cards and can be applied to other securities.

[0030]

As described above, according to the present invention, a substantially transparent recording layer containing a substance which emits fluorescence by irradiation with ultraviolet light is provided on a part or the entire surface of the outermost surface of the substrate. In the recording medium, the attribute information is recorded in a manner that is difficult to see under general illumination by the fluorescence emission pattern in which the recording layer is partially removed, so that the information is recorded in a form that is difficult to rewrite. In addition, since it is difficult to see this under general lighting, it is difficult for others to recognize what information is recorded,
Also, it does not affect the design of the card, and because it has the attribute information of the owner, it is possible to prevent not only unauthorized use by others but also forgery. can do.

When the efficiency of fluorescent light emission is reduced by a layer having a low light reflectance such as a magnetic recording layer, the light emitting efficiency of the fluorescent light emission pattern is improved by providing a light reflecting layer on the recording medium. It is possible to make the recorded fluorescent emission pattern more visible.

According to the present invention, a substantially transparent recording layer containing a substance which emits fluorescent light upon irradiation with ultraviolet light is provided on a part or the entire surface of a substrate, and ablation removal using an excimer laser is performed. By partially removing the recording layer, the attribute information of the individual forms a fluorescent light emission pattern that is hardly visible under general illumination, so that it is difficult to rewrite, and furthermore, general illumination lamps In addition to being able to record information that is difficult to see under the lighting of
Since this is a method of recording information as the final step of recording body production, it is possible to record individual information relatively easily compared to a method of printing and creating different information on each recording body, and By adjusting the wavelength, intensity and energy of the ultraviolet light, the finish is beautiful and the processing can be performed in a short time.

Further, according to the present invention, since the recording layer containing the fluorescent substance is a transparent overcoat layer, the printed surface and the magnetic recording layer can be protected.

According to the present invention, it is possible to perform recording by ablation removal using an excimer laser as a means for partially removing the recording layer containing the above-mentioned fluorescent substance. In this case, it is possible to relatively easily form a fluorescent emission pattern that is difficult to see.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a card before a fluorescent light emission pattern is recorded.

FIG. 2 is a cross-sectional view of a recording medium on which a fluorescent light emission pattern of the present invention has been recorded.

FIG. 3 is a view showing another embodiment of the recording medium according to the present invention, and is a cross-sectional view of the card before recording a fluorescent light emission pattern.

FIG. 4 is a diagram showing another embodiment of the recording body according to the present invention, and is a cross-sectional view of the recording body on which the fluorescent light emission pattern of the present invention is recorded.

FIG. 5 is a diagram showing a process of recording a fluorescence emission pattern by excimer laser irradiation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Picture printing layer 3 Layer containing a substance which emits fluorescence 4 Magnetic recording layer 5 Light reflection layer 6 Excimer laser 7 Ultraviolet light 8 Concave lens 9 Convex lens 11 Condensing lens 110 Mask pattern 12 Recording body

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B41M 5/26 B42D 15/10

Claims (6)

(57) [Claims] 1. A substantially transparent recording layer containing a substance that emits fluorescent light upon irradiation with ultraviolet light is provided on a part or the entire surface of the outermost surface of a substrate, and the recording layer is partially removed. A recording medium capable of preventing unauthorized use, characterized in that attribute information of an individual is recorded in a fluorescent light pattern so that it is difficult to see under ordinary illumination. 2. The recording body according to claim 1, wherein a light reflecting layer is provided between said base material and said recording layer. 3. The recording medium according to claim 1, wherein the attribute information is a photograph of a person's face, date of birth, gender, age, and the like. 4. The recording layer according to claim 1, wherein the recording layer is an overcoat layer for protecting a recording medium.
A recording medium according to any one of the preceding claims, which is capable of preventing unauthorized use. 5. A substantially transparent recording layer containing a substance which emits fluorescent light by irradiation with ultraviolet light is provided on a part or the whole of the outermost surface of the substrate, and the recording layer is removed by ablation using an excimer laser. A method for recording a recording medium capable of preventing unauthorized use, characterized in that by partially removing the information, an attribute information of an individual is formed into a fluorescent light emission pattern that is hardly visible under general illumination. 6. The recording method for a recording medium according to claim 5, wherein a layer reflecting light is provided between said base material and said recording layer.