JPH04205588A - Security imparting information recording medium and its reader - Google Patents

Abstract

PURPOSE:To make the forgery and the alteration of a card difficult and to improve the security of the card by forming an IR transmittance variable layer where the transmisivity of IR is changed reversibly or non-reversibly by heating, voltage applying, light irradiation, etc., on the IR light emitting layer of the card. CONSTITUTION:A recording layer 2 is formed on the one face or both sides of a substrate 1, an IR light emitting layer 3 is formed on the substrate 1 or on the recording layer 2 and an IR transmitivity variable layer 4 is formed on the IR light emitting layer 3. Accordingly, when a specified pattern original to a card issuing machine is printed on the IR transmittance variable layer 4 at card issuing, an IR light emitting pattern from the card can be changed by changing the pattern of the IR transmitivity variable layer such as a thermosensitive melting film, a thermosensitive coloring film, etc., at the time of card issuing even when the pattern of the IR light emitting layer is forged. Thus, security can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a security-imparting information recording medium and a reading device thereof.

(Prior Art) Conventionally, cards in which a recording layer is formed on one or both sides of a base body, typified by prepaid cards, ID cards, etc.
As a means of providing security (safety) to information recording media such as sheets and rolls (hereinafter explained using cards as an example), an infrared emitting layer is provided on the recording layer or on the surface of the substrate opposite to the surface on which the recording layer is formed. (For example, Japanese Patent Laid-Open No. 53-9600).

This infrared emitting layer absorbs infrared rays and emits infrared rays at a wavelength different from the absorption wavelength.Using the property of emitting infrared rays at a wavelength different from the absorption wavelength, the infrared rays are input to the recording layer. Prevents information from being read inadvertently.

Then, it has been proposed that the infrared emitting layer is provided with infrared light emitting parts over the entire surface, or infrared light emitting parts are provided so as to form a specific light emitting pattern. It is considered that the information input to the recording layer is less likely to be read inadvertently and is safer.

[Problem to be solved by the invention]

However, since the above carts are mass-produced, even if an infrared light emitting part is installed to create a specific light emission pattern,
Since a large number of cards with the same luminescent pattern are issued, there is a problem in that they can be counterfeited by using used cards or by obtaining infrared luminescent materials. In particular, the reality is that it is completely impossible to prevent intentional changes such as changing the amount of money on an officially issued card.

Therefore, an object of the present invention is to improve card security by making it difficult not only to forge a card but also to do it intentionally.

[Means for Solving the Problems] The present invention provides an infrared transmittance variable layer on the infrared emitting layer of the card, the infrared transmittance of which changes reversibly or irreversibly by heating, voltage application, light irradiation, etc. The above objective has been achieved by forming.

That is, when issuing a cart, a specific pattern unique to the issuing machine is printed on the variable infrared transmittance layer, and the variable infrared transmittance layer changes the pattern of infrared light emitted from the card, thereby increasing the security of the card.

Examples of the infrared transmittance variable layer whose infrared transmittance irreversibly changes include a heat-sensitive melt film made of a low-melting point metal such as Sn (tin) and Al (aluminum), a heat-sensitive decomposable dye, or a heat-sensitive melt dye. Examples include thermosensitive coloring films using . These materials melt, change color, and bleach by heating, applying voltage, irradiating light, etc., and irreversibly changing the transmittance of infrared rays.

In a cart equipped with such a variable infrared transmittance layer that irreversibly changes the transmittance of infrared rays, when issuing a card,
By printing a specific pattern unique to the card issuing machine on the variable infrared transmittance layer, the following mechanism can be used to change the pattern of infrared light emitted from the card, increasing the security of the card.

First, when a heat-sensitive melt film made of a low melting point metal such as Sn or AI is provided as an infrared transmittance variable layer, the heat-sensitive melt film is melted and decolored by heating, voltage application, light irradiation, etc., and Only the portion under which the infrared emitting material exists emits infrared rays.

On the other hand, when the thermosensitive coloring film is provided as an infrared transmittance variable layer, only the portion where the thermosensitive coloring film is not colored and where the infrared light emitting material is present below emits infrared rays.

With this card, even if the pattern of the infrared emitting layer is forged, by changing the pattern of the variable infrared transmittance layer such as a heat-sensitive melting film or a heat-sensitive coloring film at the time of card issuance,
Since the pattern of infrared light emitted from the card can be changed, security can be improved.

Moreover, according to the security imparting means by forming the infrared transmittance variable layer, even if a highly productive full-surface coating film is adopted for the infrared light emitting layer, the infrared light emission pattern can be changed at the time of card issuance. Very useful.

In this card, methods of changing the pattern of the variable infrared transmittance layer include changing the width of the infrared transmitting pattern of the variable infrared transmittance layer and the diameter of the spout, and specifically, barcode display methods are available.

In addition, in this type of card, security can be improved by the following methods.

■ Change the pattern of the infrared emitting layer to correspond to the issue number.

■ The infrared transmission pattern is changed by changing the pattern of the variable infrared transmittance layer depending on the publication date and month.

■ Increase the melting, discoloration, and decolorization of the variable infrared transmittance layer with each use. The infrared transmission pattern is changed by increasing the spot diameter.

■ A pattern that defines the maximum amount of money is included so that the amount of money decreases as the number of melted, discolored, and bleached portions of the variable infrared transmittance layer increases.

Furthermore, apart from security, this card can also be used to distinguish between issuing stores when a common card is used at several stores.

As the infrared emitting layer, Li Nd, Y, Mo.

01□Powder, L 1Ndl-W YK Pa Oat
(In both formulas, χ in the formula is χ = 0.1 to 0.9) Powder dispersed in resin and applied, thin films of these, or those Nd and Y mixed with other rare earth elements is used instead. Possible thin film forming methods include the one-piece method and the sputtering method, but the sputtering method is preferred because it facilitates the formation of a film with a complex composition.

When forming a heat-sensitive fusion film as an infrared transmittance variable layer, Sn (tin), AI (aluminum), Zn (zinc), Sb (antimony), TI (thallium), Te
(tellurium), Pb (lead), Bi (bismuth), and other low-melting point metals or metalloids and their alloys, but S
n, AI are particularly preferred. On the other hand, heat-sensitive melting dyes and heat-sensitive decomposition dyes used when forming a heat-sensitive coloring film as an infrared transmittance variable layer include cyanine-based, polymethine-based, anthraquinone-based, phthalocyanine-based, and dithiol metal complex salt-based dyes. , these are 200~700″
When it melts or decomposes with C, the heated part becomes transparent to near infrared rays.

In order to improve the agglomeration of this variable infrared transmittance layer, for example, when the heat-sensitive melting film is melted, and to make it easier to record patterns, one or both surfaces of the variable infrared transmittance layer are coated with, for example, acrylic resin, acrylic resin, etc. The fluidization temperature of resins, butyral resins, etc. is slightly lower than that of heat-sensitive melt films (usually 1
It is preferable to form a resin layer with a temperature of 0 to 30°C.

Further, it is preferable to form a layer with high light reflectance under the infrared light emitting layer (that is, between the infrared light emitting layer and the substrate or the recording layer) because the detection efficiency of emitted infrared light will be increased. A metal layer is usually used as such a light reflecting layer. For example, when forming a heat-sensitive fusion film using a metal with a low melting point such as Sn, Ir (iridium), Zr (zirconium), W (tungsten), T
a (tantalum), Ti (titanium), Cu (copper), pt
(platinum), Pd (palladium), Mo (molybdenum),
A metal or alloy with a higher melting point than the metal of the heat-sensitive melting film is used, such as Ru (ruthenium), Rh (rhodium), Nl (nickel), Fe (iron), Ag (silver), Au (gold), and stainless steel. (However, if a magnetic recording layer is formed as the recording layer, it is necessary to use a non-magnetic metal or a non-magnetic alloy for this light-reflecting layer).

The reason why the light-reflecting layer is formed under the infrared-emitting layer as described above is that the light-reflecting layer made of a metal or alloy with a high melting point such as stainless steel reflects the infrared rays emitted from the opposite side of the infrared-emitting layer. In order to improve the efficiency of receiving emitted infrared rays, and to improve the reflectance when the light reflective layer made of a high melting point metal or alloy such as stainless steel is melted with a heat-sensitive melting film made of a low melting point metal such as Sn. This is to reduce the change and make it difficult to visually identify the printed portion. in this way,
When a light reflecting layer made of a high melting point metal or alloy such as stainless steel is formed below the infrared light emitting layer, it is preferable to form a resin layer such as polyurethane resin on the light reflecting layer. Such a resin layer has the effect of improving the adhesiveness between the light reflection layer and the infrared light emitting layer. Note that when a metal with a very low melting point, such as Sn, is used for the heat-sensitive fusion film, a metal with a relatively low melting point, such as AI, can also be used for the light-reflecting layer.

In addition, magenta,
Applying dyes that do not absorb infrared radiation, such as yellow, red, or blank dyes (plaque dyes that absorb complementary colors do not absorb infrared radiation), or forming a resin layer containing these dyes as a camouflage layer. is preferable, since the infrared emitting material may be lightly colored and the pattern of the infrared emitting layer may be visually discerned. This is because it can make discrimination difficult.

The recording layer is formed on one or both surfaces of the substrate, and this recording layer may be a magnetic recording layer, an optical recording layer (for example, Fe-T
A magneto-optical recording layer such as b-Co, a write-once type optical recording layer coated with phthalocyanine, etc.) may be used. However, a magnetic recording layer is preferred because it is cheaper.

Furthermore, two or more recording layers can be provided, such as a magnetic recording layer on one surface of the substrate and an optical recording layer on the other surface. When the recording layer is a magnetic recording layer, the infrared emitting layer may be formed either on the recording layer or on the surface of the substrate opposite to the surface on which the recording layer is formed; however, in the case of an optical recording layer, the infrared emitting layer The layer needs to be formed on the surface of the substrate opposite to the surface on which the recording layer is formed.

The base material includes resin films such as polyester film, vinyl chloride resin film, and polyacetate film,
Synthetic paper, aluminum plate, stainless steel plate, paper, etc. are used.

Next, the security card of the present invention will be explained with reference to the drawings.

The security granting card shown in Fig. 1 has a recording layer (2) formed on one side of the base (1), and a recording layer (2) formed on the other side of the base (1), that is, the side opposite to the side on which the recording layer (2) is formed. An infrared emitting layer (3) is formed on the surface, an infrared transmittance variable layer (4) is formed on the infrared emitting layer (3), and a protective layer (5) is formed on the infrared transmittance variable layer (4). This is what I did.

The security card shown in FIG. 2 has a light reflective layer (6) below the infrared emitting layer (3) of the security card shown in FIG. 1, that is, between the infrared emitting layer (3) and the base (1). , and a camouflage layer (7) is provided between the variable infrared transmittance layer (4) and the protective layer (5), and the recording layer (2) is provided on one side of the substrate (1). formed and the substrate (
A light transmitting layer (6) and an infrared emitting layer (3) on the other side of 1)
, a variable infrared transmittance layer (4), a camouflage layer (7), and a protective layer (5) are formed in this order.

The security card shown in FIG. 3 has a recording layer (2) formed on one side of a base (1), a light reflecting layer (6), an infrared light emitting layer (3), A variable infrared transmittance layer (4), a camouflage layer (7) and a protective layer (5) are formed in this order, and the recording layer (2) in this case is a magnetic recording layer.

The security card shown in FIG. 4 corresponds to the security cart shown in the third article in which the recording layer (2) is also formed on the other side of the base body (1). In this case, the recording layer (2) on the lower surface side of the substrate (1) is an optical recording layer.

The security cart shown in FIG. 5 consists of the security card base (1) shown in FIG. 1 and the infrared emitting layer (
The recording layer (2) is formed on one surface of the substrate (1), and the recording layer (2) is formed on one surface of the substrate (1).
A light transmitting layer (6) and an infrared emitting layer (3) on the other side of 1)
, an infrared transmittance variable layer (4), and a protective layer (5) are formed in this order.

The security card shown in FIG. 6 corresponds to the security card shown in FIG. 1 in which a camouflage layer (7) is provided between the variable infrared transmittance layer (4) and the protective layer (5), A recording layer (2) is formed on one side of the substrate (1),
An infrared emitting layer (3), an infrared transmittance variable layer (4), a camouflage layer (7), and a protective layer (5) are formed in this order on the other surface of the substrate (1).

The security card shown in FIG. 7 corresponds to the security card shown in FIG. 5 in which a printing layer (8) is formed on the lower surface of the recording layer (2).

The security card shown in FIG. 8 corresponds to the security card shown in FIG. 2 in which a printing layer (8) is formed on the lower surface of the recording layer (2).

The printing layer (8) in the security card shown in FIGS. 7 and 8 above is for recording the date of use, example of use (for example, the section of use for a railway card), balance, etc., and the recording layer (2) It is formed on the free surface of the recording layer (2), that is, the lower surface of the recording layer (2) in the drawings, by means such as coating, vapor deposition, and sputtering.

In addition, the protective layer (5) in each figure is for protecting the layer below it, that is, the layer formed closer to the base (1) than it, and is made of, for example, ultraviolet curable epoxy acrylate. It is formed as the top layer of the card using a hardening resin such as resin or EB (electron beam) hardening resin.

The security card created as above is
When issuing a card, the recording layer contains the issue number, issue date, etc.
It can be used by recording necessary information such as issuer, amount, etc., and printing a specific pattern of infrared emission indicating issue number, issuer, amount, etc. on the infrared emitting layer and variable infrared transmittance layer in separate formats. Served. Of course, the light emitting portions may be formed in a specific pattern when forming the infrared light emitting layer. However, the security card of the present invention has the advantage that security can be ensured even if a specific pattern of light emitting parts is formed on the infrared light emitting layer after the card is manufactured, so the infrared light emitting layer is formed as a highly productive entire coating film. However, the usefulness of the security-added card of the present invention can be better utilized if the light-emitting portion is formed into a specific pattern when the card is issued.

Next, examples of the variable infrared transmittance layer whose transmittance of infrared rays reversibly changes include a film whose transmittance of infrared rays reversibly changes by heating, a film whose transmittance of infrared rays reversibly changes by application of voltage, There are films whose infrared transmittance changes depending on light irradiation.

Examples of films whose infrared transmittance changes reversibly upon heating include films made of styrene-butadiene copolymer and stearic acid.

Further, as a film whose transmittance of infrared rays changes reversibly by voltage application, there is a conductive polymer film.

Specific means for improving the security of the card by using these variable infrared transmittance layers that reversibly change the transmittance of infrared rays are as follows: It is the same as the case.

When using this variable infrared transmittance layer that reversibly changes the transmittance of infrared rays, the accidental resistance is slightly lower than when using the variable infrared transmittance layer that changes the transmittance of infrared rays irreversibly. , which has the great advantage of being reusable. Furthermore, in the case of an infrared transmittance variable layer that reversibly changes infrared transmittance, there is an advantage that a specific pattern can be generated only inside the device to change the pattern from the infrared light emitting layer. In this case, a specific example will be described in which a film made of a styrene-butadiene copolymer and stearic acid is formed on the infrared emitting layer. When a pattern corresponding to the numbers recorded on the recording layer is formed on a film made of styrene-butadiene copolymer and stearic acid, only the parts heated to 80°C or higher become transparent to infrared rays. Therefore, infrared rays are emitted only from the portion where the transparent portion of the film made of the styrene-butadiene copolymer and stearic acid overlaps with the light emitting portion of the infrared emitting layer. If the entire card is heated to about 65°C when taken out of the device, the entire card becomes white and no longer emits infrared rays.

The above two means (i.e. security provision means using an infrared transmittance variable layer whose infrared transmittance changes irreversibly and security provision means using an infrared transmittance variable layer whose infrared transmittance changes reversibly). They may be used together, or the present invention may be combined with other security imparting means.

The reading device irradiates the security-added card of the present invention with near-infrared rays of, for example, 810 nm, detects the presence or absence of 950 nm infrared rays emitted from the infrared emitting layer, and reads the issuing store pattern, maximum amount pattern, issue date pattern, and issue. A device that can identify number patterns, issuing machine patterns, etc. is used.

[Examples] The present invention will be explained below with reference to Examples, but these Examples do not limit the present invention in any way.

Example 1 A paint for forming a magnetic recording layer having the following composition was prepared.

Barium ferrite magnetic powder 80 parts by weight (average particle size: 0.8 μm, coercivity 25000 e) Vinyl chloride-vinyl acetate copolymer 20 parts by weight (manufactured by Union Carbide, VAGF) Polyurethane resin
7 parts by weight (manufactured by Dainippon Ink & Chemicals Co., Ltd., Vandenx T5201) Isocyanate crosslinking agent 1 part by weight (manufactured by Nippon Polyurethane Co., Ltd., Coronated) Carbon blank
4 parts by weight (manufactured by Mitsubishi Kasei Corporation, MA-8) Toluene 260 parts by weight Noclohexane 26 parts by weight The paint was prepared by mixing and dispersing the above composition in a ball mill for 100 hours.

The obtained paint was applied on a transparent polyester film with a thickness of 188 μm using a gravure coating method, dried, and a film with a thickness of 1
A magnetic recording layer of 5 μm was formed.

Next, the surface of the transparent polyester film opposite to the surface on which the magnetic recording layer is formed is coated with a thickness of 0. A lIIm Al (aluminum) film was formed by ferrite deposition.

Next, a polyurethane resin solution prepared by dissolving polyurethane resin in a 1/1 mixed solvent of cyclohexane/toluene at a concentration of 5% was applied onto the A+ film to a thickness of 500 mm (50 mm) after drying.
It was coated so that it became

Then, a paint having the composition shown below was applied thereon and dried to form an infrared emitting layer with a thickness of 2 μm.

L i N(lo, q YO, I MO4012 powder
30 parts by weight (average particle size: 0.5 μm) Vinyl chloride-vinyl acetate copolymer 20 parts by weight (manufactured by Union Carbide, VAGF) Polyurethane resin
10 parts by weight (manufactured by Dainippon Ink & Chemicals Co., Ltd., Vandenox T5201) Isocyanate crosslinking agent 1 part by weight (manufactured by Nippon Polyurethane Co., Ltd., Coro *-) L) Toluene
150 parts by weight cyclohexane
150 parts by weight A coating composition having the following composition was applied onto this infrared emitting layer and dried to form a lower acrylic silicone resin layer having a thickness of 2 μm.

40 parts by weight of acrylic silicone resin (manufactured by Chisso Corporation, Cylacoat) 60 parts by weight of xylene
A Sn (tin) film was formed.

Furthermore, the same paint as that for the lower acrylic silicone resin layer was applied onto this Sn film and dried to form an upper acrylic silicone resin layer having a thickness of 2 μm.

On this upper acrylic silicone resin layer, a blue dye (manufactured by Nippon Kayaku Co., Ltd., PCc
Approximately Lu
After forming the film to a thickness of approximately 1 μm, UV-curable Epoquin acrylate resin (manufactured by Dainippon Ink & Chemicals Co., Ltd., V5510) is applied, dried, and cured to form a protective layer made of UV-curable Evoquin acrylate resin with a thickness of approximately 1 μm. A layer was formed and then cut into a predetermined size to produce a security card.

The security card produced as described above has the structure shown in FIG. 2, and the security card of Example 1 will be explained with reference to FIG. 2 as follows.

The base (1) is made of a transparent polyester film with a thickness of 188 μm, and a film with a thickness of 15 μm is coated on one side of the base (1).
A recording layer (2) consisting of a magnetic recording layer is formed.

Then, the other surface of this substrate (1) (that is, the recording layer (
A light reflecting layer (6) made of an Al film is formed on the surface opposite to the surface on which 2) is formed.

However, in the security cart shown in Example 1, although not shown, a polyurethane resin layer with a thickness of 500 mm is formed on the AI film, and an infrared light emitting layer (
3) is formed to have a thickness of 2 μm so that the polyurethane resin layer provides good adhesion between the light reflecting layer (6) and the infrared light emitting layer (3).

An infrared transmittance variable layer (4) made of a Sn film with a thickness of approximately 500 nm is formed on the infrared light emitting layer (3), and a blue layer that does not absorb infrared rays of 75 onm or more is formed on the infrared transmittance variable layer (4). A camouflage layer (7) made of a polyurethane resin layer containing a dye and having a thickness of about 1 μm is formed, and a protective layer (5) made of an ultraviolet curable epoxy acrylate resin is further formed thereon.

However, in the security card of Example 1,
In order to protect the variable infrared transmittance layer (4) made of Sn film, although not shown, a lower acrylic silicone resin layer with a thickness of 2 μm is formed below it, that is, on the infrared emitting layer (3), After forming the Sn film, an upper acrylic silicone resin layer with a thickness of 2 μm is formed thereon. However, these lower acrylic resin layer and upper acrylic resin layer may not be provided.

Similarly, the light-reflecting layer (6), camouflage layer, protective layer (5), etc. are provided to better demonstrate the effects of the security-imparting card of the present invention, and are not necessarily required. In other words, the light-reflecting layer (6) is for increasing the ability to detect emitted infrared rays, and the camouflage layer (7) is for making it difficult to visually distinguish the emission pattern of the infrared-emitting layer (3). The protective layer (5) is an infrared transmittance variable layer (
4), etc., and even without these, the essential functions of the security card of the present invention (
In other words, it is possible to perform the function as a recording card and the function of providing security.

Example 2 A non-magnetic stainless steel film was formed in place of the aluminum film as the light reflection layer, and an Sn
A security card was produced in the same manner as in Example 1, except that an AI film was formed instead of the film. The security card of this second embodiment has the structure shown in FIG. 2, like the security card of the first embodiment.

Example 3 A light reflecting layer made of an AI film was not formed, and as a base,
A security-imparting cart was produced in the same manner as in Example 1, except that a white polyester film was used in place of the transparent polyester film. The security card of this third embodiment has the structure shown in FIG.

Example 4 A security card was produced in the same manner as in Example 1, except that a camouflage layer made of a polyurethane resin containing a blue dye that does not absorb infrared rays of 750 nm or more was not formed. The security card of Example 5 has the structure shown in FIG.

Comparative Example 1 A 15 μm thick transparent polyester film was coated with the same paint for forming a magnetic recording layer as in Example 1 on a 188 μm thick transparent polyester film.
A magnetic recording layer of m was formed. Next, Example 1 was applied to the surface of the transparent polyester film opposite to the surface on which the magnetic recording layer was formed.
A specific pattern indicating the issuer, price, and lot number was printed using the same paint as the infrared emitting layer forming paint, and dried to form an infrared emitting layer with a thickness of 2 μm (thickness of the printed portion). As a camouflage layer, a polyurethane resin layer containing 1% of a blue dye that does not absorb infrared rays with wavelengths longer than 750 nm is formed to a thickness of about 1 ljm, and a protective layer made of ultraviolet curable epoxy acrylate resin is further formed on top of the camouflage layer. Approximately 1μm
This was then cut into a predetermined size to produce a security card.

The cross-sectional structure of the security card of Comparative Example 1 is as shown in FIG. 9, and the security card of Comparative Example 1 will be explained with reference to FIG. 9 as follows.

(1) is a substrate made of a transparent polyester film with a thickness of 188 μm, and (2) is a recording layer (2) made of a magnetic recording layer with a thickness of 15 μm, which is formed on one side of the substrate (1). There is.

(3) is an infrared emitting layer, which is formed on the other surface of the base (1). (7) is a camouflage layer made of a polyurethane resin layer containing 1% of a blue dye that does not absorb infrared rays with wavelengths longer than 750 nm, and this camouflage layer (7) is formed on the infrared emitting layer (3). has been done. (5) is a protective layer made of ultraviolet curable epoxy acrylate resin formed on the camouflage layer (7).

As can be clearly understood by comparing the security card of Comparative Example 1 with the security card of Example 1 shown in FIG. Transparency variable layer (
4) is not formed, and corresponds to a security-added card with a conventional configuration.

Test Example 1 Necessary information such as the issue number, issue date, issuing store, amount, etc. is magnetically recorded on the recording layer using a card issuing machine on the security-added cards of Examples 1 to 4, and the infrared emitting layer and infrared transmittance are A cart was issued by printing a specific pattern of infrared light emission indicating the issuing store, amount, and issue number in a separate manner on each variable layer. Security tests such as visual inspection, reading S/N evaluation, intentionality resistance, and counterfeiting resistance were conducted using this cart. The results are shown in Table 1. The irradiated infrared rays include near infrared rays with a wavelength of approximately 81 Onm [light emitting diode (
LEI): laser emitted diode)] was used, and near-infrared light emitted at 950 nm was used for detection. A heating head was used to melt the Sn film of the variable infrared transmittance layer in Examples 1.3.4, and a discharge destruction head was used to melt the AI film of the variable infrared transmittance layer in Example 2.

Test Example 2 Necessary information such as the issue number, issue date, issuer, and amount was magnetically recorded on the card of Comparative Example 1 on which a specific pattern indicating the issuing store, amount, and loft number was printed using a cart issuing machine. Using this card, visual inspection, reading S/N evaluation,
We conducted security tests such as tamper resistance and counterfeit resistance.

The results are shown in Table 2. The wavelength of infrared radiation is approximately 810.
nn near-infrared rays (emitting diode (LED)) were used, and 950 n+s emission near-infrared rays were used for detection.

The evaluation methods and test methods for visual inspection, reading S/N evaluation, intentionality resistance, and counterfeiting resistance are as follows.

Visual Inspection: Current infrared emitting materials have a very pale blue color, which can be visually identified depending on the situation, so they are visually inspected and evaluated according to the following criteria.

Unidentifiable: Unable to identify in any way Difficult to identify:
Difficult to identify: It may be possible to identify depending on the lighting conditions Identifiable: Can be identified by looking closely Reading S/N rating: The higher the S/N (dB) value, the better the security. shows.

Tamper resistance: ■Changing the amount higher than the original amount, and ■Changing the amount on the recording layer (magnetic recording layer) of a used card to the original amount, whether or not the change mechanism by the reading device works. Find out.

Anti-counterfeiting: ■Infrared emission pattern (infrared emission pattern of infrared emission layer)
and magnetic recording pattern (magnetic recording pattern of recording layer)
Forging a card that is the same as one already issued, and ■
A card with an infrared pattern that is the same as an already issued card but a magnetic recording pattern that is different from an already issued card is forged to see if the change mechanism by the reader works.

As shown in Table 1, the security cards of Examples 1 to 4 of the present invention are difficult to visually discernible to impossible to identify;
It had a high read S/N (dB) value and was excellent in both intentionality and forgery resistance.

On the other hand, as shown in Table 2, the security card of Comparative Example 1, which corresponds to the security card with the conventional configuration, has a low read S/N (dB) value and a higher amount than the original amount. It cannot be checked for numbers that have been changed, or the amount on the magnetic recording layer of a used card is changed to the original amount, so it has poor accident resistance and cannot be checked if the magnetic recording pattern is forged. such as not being able to
The counterfeit resistance was also poor.

In this specification, all explanations, including the examples, have been made only with respect to cards, but in this specification, a sheet refers to a state before being cut into a predetermined size to make a card, and also a roll and a sheet. The above sheet is wound into a roll, and these sheets and rolls differ from the card only in shape, but are not essentially different in structure. Therefore, the configuration and effects described for cards also apply to sheets and rolls, and the present invention is applicable not only to the cards specifically described, but also to all information recording media that take the form of sorting or rolls. It is something that

(Effect of the invention〕 According to the present invention, there are the following effects.

(2) By forming an infrared transmittance variable layer on the infrared light emitting layer and issuing cards with different infrared light emitting patterns, the tamper resistance and counterfeit resistance are improved.

■ Providing a light reflecting layer under the infrared emitting layer increases the reading sensitivity of emitted infrared rays.

(2) If a light reflection layer is provided under the infrared light emitting layer, it will be difficult to visually distinguish the infrared light emitting pattern even when the variable infrared transmittance layer made of a low melting point metal is melted.

■ By providing a light reflecting layer under the infrared emitting layer and further forming a camouflage layer that does not absorb infrared rays with wavelengths longer than 750 nm on the variable infrared transmittance layer, the variable infrared transmittance layer made of a low melting point metal can be formed. Even when it is melted, it becomes almost impossible to visually distinguish the infrared emission pattern.

[Brief explanation of the drawing]

1 to 8 are enlarged cross-sectional views of essential parts of the security card according to the present invention. FIG. 9 is an enlarged cross-sectional view of the main parts of a conventional security card. (1)...substrate, [2)...recording layer, (3)...
...Infrared light emitting layer, (4)...Infrared transmittance variable layer,
(5)...protective layer, (6)...light reflective layer, (7
)...Camouflage Keywords 9 Figure 1...Substrate 2...Recording Layer 3...Infrared Emitting Layer 5...Protective Layer 7...Camouflage Layer 2...Recording Layer 3... Infrared light-emitting layer 4... Infrared transmittance variable layer 3 Figure bracket 4 Figure 5 Figure 2... Recording layer 3... Infrared light-emitting layer 4... Infrared transmittance variable layer

Claims (8)

[Claims] 1. A substrate (1), a recording layer (2), and an infrared emitting layer (3).
) and an infrared transmittance variable layer (4), the recording layer (2) is formed on one or both surfaces of the substrate, and the infrared emitting layer (3) is formed on the substrate (1) or on the recording layer. The infrared transmittance variable layer (4) is formed on the layer (2), and the infrared transmittance variable layer (4) is formed on the infrared light emitting layer (3).
A security-imparting information recording medium, characterized in that the information recording medium is formed on the top. 2. 2. The security-imparting information recording medium according to claim 1, wherein the infrared transmittance variable layer (4) changes the infrared transmittance reversibly or irreversibly by heating, voltage application, light irradiation, or the like. 3. 3. The security-imparting information recording medium according to claim 1, wherein the infrared emitting layer (3) absorbs infrared rays of a specific wavelength and emits infrared rays of a different wavelength from the absorbed wavelength. 4. 4. The security-imparting information recording medium according to claim 1, wherein the infrared light-emitting layer (3) comprises a non-light-emitting part and a light-emitting part, and the light-emitting part is formed in a specific pattern. 5. 5. The security-imparting information recording medium according to claim 1, wherein the recording layer (2) is a magnetic recording layer. 6. 6. The security-imparting information recording medium according to claim 1, further comprising a light reflecting layer (6) provided under the infrared emitting layer (3). 7. Security according to claim 1, 2, 3, 4, 5 or 6, characterized in that a camouflage layer (7) which does not absorb infrared rays with wavelengths longer than 750 nm is formed on the variable infrared transmittance layer (4). Grant information recording medium. 8. A reading device for a security-imparting information recording medium, characterized in that it utilizes a combination of a transmission pattern of an infrared transmittance variable layer (4) and a light emission pattern of an infrared light emitting layer (3).