JPH02173890A - Information recording medium - Google Patents

Abstract

PURPOSE:To prevent forgery due to the rewrite of information from being performed by providing an infrared absorption bar code on an infrared reflecting layer, a thermal coloring layer absorbable an infrared ray after coloring provided on a masking layer, and identifying truth/falsehood by collating an infrared absorption waveform with magnetic recording information. CONSTITUTION:The infrared reflecting layer 11 made of milky group polyvinylchloride is provided on a plane on one side of a substrate 10, and the infrared absorption bar code 12 is provided on the layer 11. Also, the masking layer 13, the thermal coloring layer 14 containing leuco dye, and a surface protection layer 15 are provided on the layer 12. Furthermore, the magnetic recording layer 16 is provided on the plane on the other side of the substrate 10, and a back plane protection layer 17 made of a transparent polyvinylchloride is provided on the layer 16. The infrared ray projected from an infrared sensor is absorbed by a part 18 where the thermal coloring layer colors, therefore, no infrared absorption bar code is read. In such a way, since no collation with the infrared absorption bar code can be performed even when the information on the information recording layer is rewritten, thereby, the forgery can be prevented from being performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an information recording medium that exhibits an excellent anti-counterfeiting effect.

(Prior art and its problems) Conventionally, information to be recorded or erased on an information recording medium such as a prepaid card is recorded only by magnetism.

For example, balance information on telephone cards and the like is recorded or erased magnetically. This allows you to check the remaining amount.

FIG. 4 is a sectional view of an example of a conventional information recording medium.

This information recording medium has a magnetic recording layer 42 provided on one surface of a base 40, and a protective layer 44 provided thereon. Magnetic recording is performed by passing this information recording medium through a magnetic field having a sharp distribution, and utilizing the saturated residual magnetic flux of the rectangular hysteresis characteristic of the magnetic recording layer within the magnetic field. Information recorded in this way can be stored permanently and can be easily erased and rewritten. Furthermore, the recording density is high and a wealth of information can be recorded. Therefore, this information recording medium is widely used in prepaid cards such as ID cards, credit cards, and cash cards.

However, in conventional information recording media, information can be easily recorded and erased. For this reason, it is easy to forge and can be used illegally by rewriting the information.

SUMMARY OF THE INVENTION An object of the present invention is to provide an information recording medium that can prevent counterfeiting due to rewriting of information.

(Means for Solving the Problems) The present invention comprises a base, an infrared reflective layer provided on one surface of the base, an infrared absorbing barcode provided on the infrared reflective layer, and an infrared absorbing barcode. A concealing layer provided on the infrared reflective layer provided, a thermal coloring layer provided on the hiding layer capable of absorbing infrared rays after coloring, and a magnetic recording layer provided on the other surface of the substrate. The present invention provides an information recording medium characterized in that authenticity is identified by comparing an infrared absorption waveform with magnetically recorded information.

Here, the substrate may be made of paper, plastic, or the like, as long as it has the strength necessary for use as an information recording medium.

Further, by using a magnetic material for the base, the base may also serve as a magnetic recording layer.

Further, for the magnetic recording layer, an ordinary magnetic material that can be recorded, read, and erased by a magnetic head is used.

Further, the infrared reflective layer is used to distinguish between a portion of the infrared reflective layer with an infrared absorbing barcode and a portion without the infrared absorbing barcode when sensing with an infrared sensor. In other words, due to the presence of this infrared reflective layer, the infrared rays emitted from the infrared sensor are reflected and received by the sensor in areas where there is no infrared absorbing barcode, and the infrared rays emitted from the infrared sensor are reflected and received by the sensor in areas where the infrared absorbing barcode is present. be absorbed into. Therefore, identification is possible by reading the absorption waveform with an infrared sensor. Therefore, it is necessary to use a material that efficiently reflects infrared rays for this infrared reflective layer. Examples of such materials include metal thin films such as aluminum and chromium, and white ink containing calcium carbonate and titanium oxide as main components. Furthermore, an infrared reflective material may be used for the base so that the base also serves as an infrared reflective layer.

Further, the infrared absorbing barcode may be any barcode as long as it sufficiently absorbs infrared rays, contrary to the infrared reflecting layer. Examples include infrared absorbers such as organometallic complex, anthraquinone, aminium, polymethine, diimonium, and cyanine.

Further, the concealing layer may be any layer as long as it fixes and conceals the infrared absorbing barcode provided on the infrared reflective layer, efficiently transmits infrared rays, and does not transmit visible light.

In addition, the thermal coloring layer is colored by infrared rays and absorbs the infrared rays after coloring to hide the infrared barcode under the thermal coloring layer.), T! a,. J9
-C, Yu. Coloring layer: (Yo, it is necessary to use a material that can be easily colored by a heat source such as infrared rays and can absorb infrared rays after coloring. For example, this thermal coloring layer can be formed using thermal It is formed by containing a coloring material.

Further, the hiding layer may contain a thermal coloring material so that the hiding layer also serves as the thermal coloring layer.

Further, a protective layer may be provided on the front and back surfaces of this information recording medium to protect it. This protective layer may be made of any material as long as it can protect the information recording medium itself under normal usage conditions.

For example, when the substrate is paper, it is formed from an OP varnish coating or a transparent plastic film such as vinyl chloride, and when the substrate is a plastic sheet, it is formed from a transparent plastic sheet such as vinyl chloride.

The present invention may also be carried out using an information recording medium having a structure in which an infrared absorbing layer is provided on one entire surface of a substrate, and a patterned infrared reflecting layer is provided on the infrared absorbing layer.

That is, the infrared rays emitted from the infrared sensor are reflected and received by the sensor in the areas where the patterned infrared reflective layer is present on the infrared absorbing layer, and the infrared rays are reflected in the areas where the patterned infrared reflective layer is not present. Absorbed by the absorbent layer. Therefore, the absorption waveform becomes clear and can be identified, as described above.

(Function) According to the information recording medium of the present invention, information is recorded on the magnetic recording layer, and the information is associated with an infrared absorbing barcode or a patterned infrared reflecting layer. Therefore, identification is performed by comparing the information recorded on the magnetic recording layer with the waveform of the infrared absorbing barcode or patterned infrared reflective layer, which is associated with the information and is sensed by an infrared sensor. When this information recording medium is used, the information equivalent to the amount used will be erased, and the thermal coloring layer corresponding to the position of the infrared absorbing barcode or patterned infrared reflective layer associated with that information will be erased by infrared rays. It develops color and hides the barcode below. Therefore, due to the coloring of this thermal coloring layer, the infrared rays emitted from the infrared sensor are absorbed by the colored portion of the thermal coloring layer, so that the infrared absorbing barcode under the thermal coloring layer cannot be read. As a result, even if the information in the magnetic recording layer is rewritten, this information recording medium cannot be used. Furthermore, since the infrared reflective layer and the infrared absorbing barcode are made invisible by the concealing layer, their presence can be made even more difficult to detect. In this way, forgery of information recording media can be prevented.

(Example) Hereinafter, the information recording medium of the present invention will be explained with reference to the drawings.

Embodiment 1 FIGS. 1(a) and 1(b) are cross-sectional views of an embodiment of the information recording medium of the present invention. This information recording medium is
An infrared reflective layer 11 made of opalescent polyvinyl chloride is provided on one surface of a substrate 10 made of polyethylene terephthalate, and an infrared absorbing barcode 12 is provided thereon with black ink. Further, a concealing layer 13 made of a binder containing a pigment is provided thereon, a thermal coloring layer 14 containing a leuco dye is further provided thereon, and a surface protection layer 15 made of transparent polyvinyl chloride is further provided thereon. has been established. A magnetic recording layer 16 is provided on the other surface of the substrate 10, and a back surface protective layer 17 made of transparent polyvinyl chloride is provided thereon.

When this information recording medium is used, as shown in FIG. 1(b), the infrared rays emitted from the infrared sensor are absorbed by the colored portion 18 of the thermal coloring layer. As a result, the absorption waveform detected by the infrared sensor becomes as shown in FIG. 2, and the infrared absorption barcode cannot be read.

Therefore, even if the information on the magnetic recording layer is rewritten, it cannot be used because it is not compared with the infrared absorption barcode. In this way, counterfeiting can be prevented.

Embodiment 2 FIGS. 3(a) and 3(b) are cross-sectional views of another embodiment of the information recording medium of the present invention. This information recording medium has an infrared absorbing layer 31 made of black ink on one side of a base 30 made of polyethylene terephthalate, and a patterned infrared reflecting layer 32 made of milky white polyvinyl chloride provided thereon. ing. Further, a concealing layer 33 made of a binder containing a pigment is provided thereon, and a thermal coloring layer 34 containing a leuco dye is further provided thereon.
A surface protection layer 35 made of transparent polyvinyl chloride is provided thereon. A magnetic recording layer 36 is provided on the other surface of the base 30, and a back surface protective layer 37 made of transparent polyvinyl chloride is provided thereon.

When this information recording medium is used, the infrared rays emitted from the infrared sensor are absorbed by the colored portion 38 of the thermal coloring layer, as shown in FIG. 3(b). As a result, the absorption waveform sensed by the infrared sensor becomes as shown in FIG. 2, similar to the first embodiment, and the infrared absorption barcode cannot be read. Therefore, even if the information on the magnetic recording layer is rewritten, it will not be compared with the infrared absorption barcode.
cannot be used. In this way, counterfeiting can be prevented.

(Effects of the Invention) As explained above, the information recording medium of the present invention can exhibit an excellent anti-counterfeiting effect.

[Brief explanation of the drawing]

FIG. 1(a) is a sectional view of one embodiment of the information recording medium of the present invention before use, FIG. 1(b) is a sectional view of one embodiment of the information recording medium of the present invention after use, FIG. 2 is an output waveform when an infrared sensor senses the information recording medium after use according to the present invention, and FIG. 3(a) is a cross-sectional view of another embodiment of the information recording medium according to the present invention before use. , FIG. 3(b) is a sectional view of another embodiment of the information recording medium after use according to the present invention, and FIG. 4 is a sectional view of a conventional information recording medium. 10.30.40...Base, 11...Infrared reflective layer, 12...Infrared absorbing barcode, 13.33...
Hiding layer, 14... Thermal coloring layer, 15, 35° 44
...Surface protective layer, 16. =36.42...Magnetic recording layer, 17.37...Back surface protective layer, 18.38...Coloring part in the thermal coloring layer, 20...Infrared sensor in the coloring part in the thermal coloring layer Output waveform, 21...
Output waveform of infrared sensor for infrared absorption barcode. Applicant's agent Patent attorney Takehiko Suzue

Claims (6)

[Claims] (1) a base, an infrared reflective layer provided on one surface of the base, an infrared absorbing barcode provided on the infrared reflective layer, and an infrared reflective layer provided with the infrared absorbing barcode; a thermal coloring layer provided on the hiding layer and capable of absorbing infrared rays after coloring; and a magnetic recording layer provided on the other surface of the substrate, What is claimed is: 1. An information recording medium characterized in that authenticity is identified by comparing information with magnetically recorded information. (2) a base, an infrared absorbing layer provided on one surface of the base, a patterned infrared reflective layer provided on the infrared absorbing layer, and a patterned infrared reflective layer provided on the patterned infrared reflective layer; a thermal coloring layer provided on the hiding layer and capable of absorbing infrared rays after coloring; and a magnetic recording layer provided on the other surface of the substrate, and a magnetic recording layer capable of absorbing infrared absorption waveforms and magnetic recording. An information recording medium characterized in that authenticity is determined by comparing information with other information. (3) The information recording medium according to any one of claims 1 to 2, wherein the substrate also serves as the infrared absorbing layer. (4) The information recording medium according to claim 1 or 2, wherein the hiding layer also serves as the thermal coloring layer. (5) The information recording medium according to claim 2, wherein the infrared absorbing layer also serves as the magnetic recording layer. (6) The information recording medium according to claim 1 or 2, wherein the thermal coloring layer is made of a metal complex thermal coloring material.