JPH04338598A - Recording material and recording method thereof - Google Patents

Abstract

PURPOSE:To prevent the unlawful use of a recording material by providing a fluorescence emitting pattern part by the irradiation of the recording material with ultraviolet rays as the recording of data hard to visually observe in usual. CONSTITUTION:A transparent protective layer 3A containing an ultraviolet absorber is provided in a part or to the entire surface of a base material containing a substance emitting fluorescence by the irradiation with ultraviolet rays, and partially removed to form a fluorescence emitting pattern. The part where the layer containing the ultraviolet absorber is removed is difficult to visually confirm under the irradiation with the light from an ordinary illumination lamp but emits fluorescence under the irradiation with weak ultraviolet rays and therefore, the fluorescence emitting pattern can be clearly and visually confirmed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium and a recording method for recording bodies such as prepaid cards and credit cards that can prevent unauthorized use of the recording medium.

0002

2. Description of the Related Art Cards such as credit cards, which are often used as payment means in place of cash, are equipped with counterfeit prevention means.

[0003] For example, processing is performed such as recording magnetic information on the card for identification, providing an identification number by embossing on the surface of the card, or adding a hologram to the card. In addition, as a means of identifying and confirming the holder of a card such as a credit card, the signature of the holder is also recorded.

0004

[Problems to be Solved by the Invention] However, although the forgery prevention means for credit cards, etc. described above can prevent the creation of counterfeit cards, it is possible to prevent the creation of counterfeit cards. It is not a means of confirming identity.

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

[0006] As mentioned above, in order to prevent unauthorized use of credit cards, etc. by others, the cardholder's name and name must be written on the credit card, etc. in a non-rewritable form.
It is desirable to record personal attribute information such as date of birth, age, gender, and facial photo.

[0007] If this personal attribute information could be recorded in a form that is normally invisible, it would be more effective and would not interfere with the design of the card, making it possible to create cards with excellent functionality. is possible.

[0008] As such a method, for example, using transparent fluorescent ink to print personal attribute information on the top surface of the card or inside it is conceivable, but it is necessary to perform different printing for each card, which is extremely difficult. The problem is that it is time-consuming and impractical.

The present invention has been made in view of the above-mentioned problems, and its object is to provide a recording medium in which information is recorded in a form that is difficult to see with the naked eye under normal conditions.

Furthermore, according to the present invention, information that is difficult to visually recognize under normal conditions can be recorded relatively easily by partially removing the layer containing the ultraviolet absorber from the produced unrecorded recording medium. The purpose of the present invention is to provide a recording method for a recording medium.

[0011]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides ultraviolet absorption for partially or entirely removing a substrate containing a substance that emits fluorescence when irradiated with ultraviolet light. The recording medium is configured to include a layer containing the agent.

Further, the present invention provides a layer containing a substance that emits fluorescence when irradiated with ultraviolet light on a part or the entire surface of the base material, and further includes a layer containing an ultraviolet absorber for partially removing the ultraviolet light. The recording medium is configured to include the following.

Another feature of the present invention is that the recording medium is provided with a layer for reflecting light.

Furthermore, in the present invention, a layer containing an ultraviolet absorber for partial removal is provided on a part or the entire surface of a base material containing a substance that emits fluorescence when irradiated with ultraviolet light, and the ultraviolet absorber is removed. It is configured to record a fluorescence emission pattern by partially removing a layer containing the fluorescent light.

Further, the present invention provides a layer containing a substance that emits fluorescence when irradiated with ultraviolet light on a part or the entire surface of the base material, and further includes a layer containing an ultraviolet absorber for partially removing the ultraviolet light. is provided, and a fluorescent light emission pattern is recorded by partially removing the layer containing the ultraviolet absorber.

[0016] Furthermore, the information recorded on the recording layer is configured such that the information is an individual's facial photograph, date of birth, gender, age, and other attribute information.

[0017] Furthermore, the layer containing the ultraviolet absorber is configured as an overcoat layer for protecting the recording medium.

[0018] Furthermore, the layer containing the ultraviolet absorber is transparent.

Furthermore, the present invention is configured to use energy rays as means for partially removing the layer containing the ultraviolet absorber.

Another point is that the energy beam is an excimer laser.

[0021]

[Function] When the layer containing the ultraviolet absorber is colorless and transparent, the recorded fluorescence pattern is difficult to visually observe because the color appearance of the recording is the same as that of the unrecorded one, but when irradiated with ultraviolet light, Among the fluorescent light emitting pattern parts, the layer containing the ultraviolet absorber does not emit fluorescence because the ultraviolet light does not reach the base material or layer containing the fluorescent material due to the ultraviolet absorber in the layer. Since the portion from which the layer containing the absorbent has been removed emits light, the information from the pattern can be clearly seen.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

FIGS. 1 and 2 are diagrams showing an embodiment of a recording medium according to the present invention, and FIG. 1 is a cross-sectional view of an unrecorded recording medium;
FIG. 2 is a sectional view of the recording medium according to the present invention after recording. The card base material 1 serves as a carrier for this card, and contains a substance that emits fluorescence when irradiated with ultraviolet light. Examples of the fluorescent substance include fluorescent whitening agents and fluorescent dyes, which are incorporated into the card base material 1 by kneading or the like. The card base material 1 is a film made of a polymeric material such as polyvinyl chloride resin, polyethylene terephthalate resin, ABS resin, AS resin, polysulfone resin, polycarbonate resin, polyimide resin, or acrylic resin represented by polymethyl methacrylate. Alternatively, a sheet or the like can be used, and pigments etc. are kneaded to obtain the required color and density.

[0024] In this example, a commercially available white polyethylene terephthalate film (E-24 manufactured by Toray Industries, Ltd.) with a thickness of 188 μm and into which a fluorescent pigment was kneaded was used.

A layer 3 containing an ultraviolet absorber is coated on one or both sides of the base material 1, and a layer 2 containing patterns such as letters and figures is formed on the card base material 1. This layer 3 protects the pattern printing or card base material, and
It is preferred to use a transparent material so that the layer is transparent and visible from the outside. The reason for this is that a transparent layer allows recording in shapes that are difficult to visually recognize under normal conditions.

In this embodiment, PM is used as the material for the layer 3.
20 parts of MA (polymethyl methacrylate), TINUV
IN327 (UV absorber made by Ciba Geigy) 5 parts, silica 5 parts, lubricant 2 parts, MEK (methyl ethyl ketone) 30 parts
An ink having a composition of 30 parts of toluene and 30 parts of toluene was applied to a thickness of 1 μm and dried to produce a recording medium as shown in FIG.

FIGS. 3, 4, 5, and 6 show other embodiments of the recording medium according to the present invention. 3 and 5 are cross-sectional views of an unrecorded recording medium, and FIGS. 4 and 6 are cross-sectional views of the recording medium according to the present invention after recording. Note that the same reference numerals are given to parts that perform the same functions as those in the above-described embodiment.

The card base material 21 does not contain a substance that emits fluorescence when exposed to ultraviolet light, and a pattern printing layer is formed on one side of the base material 21, and a magnetic recording layer 25 is formed on the other side by a method such as coating with a known magnetic material. do.

A layer 24 containing a substance that emits fluorescence when irradiated with ultraviolet light is provided on the pattern printing layer. In this example, a fluorescent ink consisting of 20 parts of an acrylic binder, 5 parts of a fluorescent pigment (GOF-B manufactured by Nemoto Tokushu Kagaku Co., Ltd.), 30 parts of toluene, and 30 parts of MEK was applied to a thickness of 2 μm.

When a recording layer is provided on the upper surface of the magnetic recording layer 25, since the light reflectance of the magnetic recording layer is low and the fluorescence emission efficiency is poor, a white pigment such as titanium white is included on the magnetic recording layer. It is preferable to provide the layer 24 containing the above-mentioned fluorescent substance after providing an ink layer or a light reflection layer made of a metal thin film layer such as aluminum.

Furthermore, a layer 3 containing an ultraviolet absorber is formed on the layer 24 containing a fluorescent substance. It is preferable to use a transparent material for this layer so that it protects the pattern printing layer and the magnetic recording layer and is a transparent layer that can be visually observed from the outside.

[0032] Recording methods for this recording medium include a method of mechanically removing the layer containing the ultraviolet absorber and a method of removing it by ablation using an excimer laser. By adjusting the energy, the finish is beautiful and the processing time is short, which is preferable.

Using an optical system as shown in FIG. 7, 308 nm ultraviolet light is emitted by an excimer laser (XeCl) 6.
One pulse is irradiated at the imaging plane with an energy of 500 mJ per cm2, and the information on the layer 3 containing the ultraviolet absorber is ablated and recorded, creating a fluorescence emission pattern as shown in Figures 2, 4, and 6. I got a record.

The recorded fluorescence pattern was hardly visible under ordinary illumination, but it was detected using a weak ultraviolet lamp for readout (for example, San Gabriel's Black Ray Lamp Model UVL-56). When ultraviolet rays were irradiated, a fluorescent light emission pattern was observed in which the portion 3A, where the layer containing the ultraviolet absorber was removed by ablation, emitted light.

[0035] The recording body 11 created in this way is
Even before and after irradiation with weak ultraviolet light for checking, no change in appearance was observed under general lighting.

[0036] Attribute information such as an individual's name, gender, date of birth, and facial photo can be easily recorded by moving the excimer laser beam or by using a mask pattern in which the information is recorded in advance. cards can be formed.

Further, in the embodiment shown in FIG. 2, the layer containing the ultraviolet absorber is provided on the entire surface of the base material of the recording medium, but it is also possible to provide a layer containing the ultraviolet absorbent on a part of the recording medium. Needless to say. Similarly, in the embodiments shown in FIGS. 4 and 6, a layer containing a substance that emits fluorescence when irradiated with ultraviolet light and a layer containing an ultraviolet absorber are provided on the entire surface of the base material of the recording medium. These may be provided in a part of the recording medium.

Furthermore, the recording medium and recording method of the present invention include:
It can be applied not only to cards but also to other securities.

[0039]

As described above, according to the present invention, a layer containing an ultraviolet absorber for partial removal is provided on a part or the entire surface of a base material containing a substance that emits fluorescence when irradiated with ultraviolet light. Since it has a fluorescence emission pattern recorded by partially removing the layer containing the ultraviolet absorber, information is recorded in a form that is difficult to rewrite, and moreover, it cannot be used under ordinary lighting. It is difficult to see this visually,
This makes it difficult for others to recognize what information is recorded, so it does not affect the design of the card, and by making that information the attribute information of the cardholder, Not only can unauthorized use by others be prevented reliably, but also counterfeiting can be prevented.

Further, according to the present invention, even when a recording layer is further provided on the side of the base material on which the magnetic recording layer, etc. is provided, a fluorescent light emitting layer is provided between the magnetic recording layer, etc. and the layer containing the ultraviolet absorber. By providing a layer containing a substance, it becomes possible to read out the recorded fluorescence emission pattern by partially removing the layer containing an ultraviolet absorber, and more information can be recorded.

Furthermore, by providing a layer that reflects light on the recording medium, the efficiency of fluorescent light emission in a layer with low light reflectivity such as a magnetic recording layer is reduced, making it difficult to visually recognize the fluorescent light emission pattern. It is possible to solve this problem and make the recorded fluorescence pattern more clearly visible.

Furthermore, according to the present invention, a layer containing an ultraviolet absorber for partial removal is provided on a part or the entire surface of the base material containing a substance that emits fluorescence when irradiated with ultraviolet light, By partially removing the agent-containing layer, we created a structure in which a fluorescence emission pattern is recorded, making it possible to record information that is difficult to rewrite and that is difficult to see with the naked eye under the irradiation of ordinary lighting. In addition, since it is a method of recording information as the final step in the production of recording media, it is relatively easy to record individual information compared to the method of printing different information on each recording media. Become.

Further, according to the present invention, a layer containing a substance that emits fluorescence when irradiated with ultraviolet light is provided on a part or the entire surface of the base material, and furthermore, an ultraviolet absorber for partially removing the layer is provided on the layer. The layer containing the ultraviolet absorber is provided, and the fluorescent emission pattern is recorded by partially removing the layer containing the ultraviolet absorber, so information is recorded in a format that is difficult to rewrite, and moreover, In addition to being able to record information that is difficult to see under illumination, this is a method of recording information as the final step in manufacturing a recording medium, so it is a method of printing different information on each recording medium. It is possible to record individual information relatively easily compared to .

Furthermore, according to the present invention, since the layer containing the ultraviolet absorber is configured as a transparent overcoat layer, the printed surface and the magnetic recording layer can be protected.

According to the present invention, energy beams,
In particular, it is also possible to use an excimer laser, and it is possible to relatively easily record a fluorescence emission pattern that is difficult to see with the naked eye under irradiation with general illumination light.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a card before recording a fluorescence emission pattern.

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

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

FIG. 4 is a diagram showing another embodiment of the recording medium according to the present invention, and is a sectional view of the recording medium on which the fluorescence emission pattern of the present invention is recorded.

FIG. 5 is a diagram showing another embodiment of the recording medium according to the present invention, and is a sectional view of an unrecorded card provided with a light reflective layer.

FIG. 6 is a diagram showing another embodiment of the recording medium according to the present invention, and is a cross-sectional view of the recording medium on which a fluorescence emission pattern is recorded.

FIG. 7 is a diagram showing a process of recording a fluorescence emission pattern by excimer laser irradiation.

[Explanation of symbols]

1 Card base material containing a substance that emits fluorescence when irradiated with ultraviolet light 2 Pattern printing layer 3 Layer containing ultraviolet absorber 6 Excimer laser 7 Concave lens 8 Convex lens 9 Mask pattern 10 Condensing lens 11 Recording body 12 Ultraviolet light 21 Card base material 24 Layer containing a substance that emits fluorescence when irradiated with ultraviolet light 25 Magnetic recording layer 26 Light reflecting layer

Claims (11)

[Claims] 1. A recording medium comprising a layer containing an ultraviolet absorber for partial removal on a part or the entire surface of a substrate containing a substance that emits fluorescence when irradiated with ultraviolet light. [Claim 2] A layer containing a substance that emits fluorescence when irradiated with ultraviolet light is provided on a part or the entire surface of the base material, and further provided with a layer containing an ultraviolet absorber for partial removal. A recording body characterized by 3. A light-reflecting layer is provided on a part or the entire surface of the base material, a layer containing a substance that emits fluorescence when irradiated with ultraviolet light is provided on the layer, and a layer containing a substance that emits fluorescence when irradiated with ultraviolet light is further provided on the layer. 1. A recording medium comprising a layer containing an ultraviolet absorber for absorbing ultraviolet light. 4. The recording medium according to claim 1, wherein the fluorescent light emission pattern recorded is attribute information such as an individual's facial photograph, date of birth, gender, and age. 5. A layer containing an ultraviolet absorber is provided on a part or the entire surface of a substrate containing a substance that emits fluorescence when irradiated with ultraviolet light, and the layer containing the ultraviolet absorber is partially removed to emit fluorescence. A recording method for a recording medium characterized by recording a pattern. 6. A layer containing a substance that emits fluorescence when irradiated with ultraviolet light is provided on a part or the entire surface of the base material, and a layer containing an ultraviolet absorber for partial removal is further provided thereon. 5. The method of recording a recording medium according to claim 1, wherein the fluorescence emission pattern is recorded by partially removing the layer containing the ultraviolet absorber. 7. A light-reflecting layer is provided on a part or the entire surface of the base material, a layer containing a substance that emits fluorescence when irradiated with ultraviolet light is provided on the layer, and a layer containing a substance that emits fluorescence when irradiated with ultraviolet light is further provided on top of the layer. A recording medium characterized in that a layer containing an ultraviolet absorber is provided for recording a fluorescence emission pattern by partially removing the layer containing an ultraviolet absorber. Recording method. 8. The recording medium according to claim 1, wherein the layer containing the ultraviolet absorber is an overcoat layer for protecting a base material or a layer containing a fluorescent substance. 9. The recording medium according to claim 1, wherein the layer containing the ultraviolet absorber is transparent. 10. The method for recording a recording medium according to claim 5, wherein energy rays are used as a means for partially removing the layer containing the ultraviolet absorber. 11. The method for recording a recording medium according to claim 5, wherein the energy beam is an excimer laser.