JPS5828865Y2 - Tamper-proof card - Google Patents

Description

[Detailed description of the invention] This invention relates to a certification card that can prevent falsification such as forgery and alteration.

Certification cards such as securities, certificates, identification cards, train tickets, horse racing tickets, lottery tickets, membership cards, credit cards, bank cards, automatic teller machine cards, etc. must have a verification function; It is necessary to have a function that can prevent tampering such as forgery and alteration.

Conventionally, this type of card (in this specification, a card refers to a sheet of paper, and is not necessarily limited to cards made of hard or elastic materials) has been used as a method to prevent tampering. Items that make the expression of the card base material or display items non-reproducible, such as applying a background pattern to the card base material or expressing the display items on the card by engraving, and those that use fluorescent paint, or A card base material with a pattern, such as the formation of a watermark pattern, that is normally not visible but becomes visible through some means only when inspecting the authenticity of the card. There is.

Among the former tampering prevention methods, the method of expressing display information by engraving on the card base material has restrictions on the properties such as the thickness and hardness of the card base material, and the method of applying a background pattern to the card base material has limitations. If the card base material itself is forged, the purpose of preventing tampering cannot be achieved.

Furthermore, among the methods of preventing tampering by the recipient, if the hidden design is made of cedar bark using fluorescent paint, the presence or absence and shape of the hidden design can be easily confirmed by using a black light, and the black light Since there is no trace of its use, it is impossible to detect if tampering has been attempted.

In the case of the method of inserting a watermark design, it is easy to confirm the presence or absence of the design and the shape of the card by lighting and visual inspection.Additionally, it is necessary to process the card base material in order to insert a watermark design.
The price of the card base material becomes expensive.

Furthermore, when a photochromic compound is used, there are disadvantages in that it has poor light resistance, short life span, and is expensive.

Therefore, the conventional techniques have not been able to provide satisfactory protection against tampering with the certification card.

This device has a hidden pattern that allows easy detection of tampering or attempted tampering, has a long lifespan, is inexpensive, and has no restrictions on the card base material. The purpose is to provide cards.

Corresponding to this purpose, the tamper-proof card of this invention is
It is characterized in that at least a portion of the surface of the card is provided with letters, designs, patterns, etc. that are transparent or of the same color as the card, made of a substance that has supercooling properties.

The details of this invention will be explained below with reference to the drawings showing one embodiment.

In FIG. 1, 1 is a tamper-proof card.

The tamper-proof card 1 includes a printing layer 3 that displays a desired pattern on at least a portion of the surface of the card 2 by printing.

The printing layer 3 is made of transparent ink or ink of the same color as the card 2 (hereinafter simply referred to as transparent ink), and therefore the provision of the printing layer 3 cannot normally be visually recognized.

The transparent ink contains a supercooling substance that is transparent or the same color as Card 2, and a binder that is transparent or the same color as Card 2. In this specification, the supercooling substance is solid at room temperature and melts when heated. or disassemble,
Even if it is cooled to around room temperature, it is still a heat-sensitive material that has powder adhesion resistance, and materials with such supercooling properties are known (for example, Japanese Patent Publication No. 41-24
(Refer to Publication No. 32, Special Publication No. 17192/1973, etc.)
It is commercially available, and there are many inorganic and organic compounds. Inorganic compounds include sulfur, aluminum potassium sulfate, boric acid, ferrous sulfate, etc., and organic compounds include sugars such as glucose and maltose, benzoic acid, and cinnamon. Acids, acids such as citric acid and maleic anhydride and their salts, urea, acetanilide, resorcinol, and the like can be used.

These supercooling substances can be used alone or in combination as a mixture.
Better results are often obtained when used as a mixture.

As binders for producing ink from these supercooling substances, those conventionally used in the production of normal inks can be used, such as linseed oil-based varnish, rosin-modified phenolic resin, and rosin-modified alkyd resin. , vinyl chloride resin, chlorinated rubber, and low-molecular polyethylene resin.

In addition to the printing layer 3 made of transparent ink, it is of course possible to provide a printing layer 4 made of ordinary printing ink on the card 2.

As a heat source for heating the printed layer 3, a quartz infrared lamp or any other suitable heat source can be used.

In the tamper-proof card constructed in this way, the display items that should be visually expressed as an identification card on the card 2 are expressed by the printing layer 4 made of normal printing ink, but the hidden designs etc. are made by transparent ink. It is constructed invisibly by the printed layer 3.

However, if you want to check for tampering such as forgery or falsification, heating the printing layer 3 on the tamper-proof card 1 will cause the supercooling substance contained in the transparent ink to become sticky, and therefore the printing The surface of layer 3 is in a state where powder can be resistant to adhesion.

In this state, as shown in FIG. 2, colored powder 5 is attached to the printing layer 3 to develop the hidden design.

The authenticity of this developed hidden pattern can be inspected to determine whether or not it has been tampered with.

In addition, a person planning to falsify a card must first know the contents of the hidden symbol, but the hidden symbol can cause the card to heat up.
This cannot be known unless it is developed, and traces of heating and development remain until later, making it easy to know that tampering has been done.

The colored powder to be attached to the printing layer 3 in order to develop the pattern on the printing layer 3 may be a toner used for electrostatic copying, a resin colored with a pigment and finely pulverized to about 5 to 100 microns, or any other suitable material. The colored Pinaceae can be used.

Next, an example in which this invention is applied to pari-mutuel betting tickets (horse racing tickets) will be described.

As shown in FIG. 3, the voting ticket 6 has necessary information 7 printed visibly on the surface of the card 2, and a hidden design 8 printed invisible with transparent ink.

Now, even if you plan to falsify the voting ticket by cutting off and peeling off part 1 of the required information 7' with a sharp knife, etc., and replacing it with a small piece 7'' of 7, the prize money will not be awarded. When the ticket is heated at the exchange office and the hidden pattern 8 is developed with toner, it is easy to see that the pattern 8' has a discrepancy, as shown in FIG. It is easy to know if a ticket has been tampered with.

In addition, when attempting to alter the hidden design so that there is no discrepancy, it is necessary to first heat and develop the hidden design 8 to know the shape of the hidden design, but in this case, there are no traces of the development. Since it remains until later, it becomes clear whether or not there has been any falsification, and in this way, it is possible to prevent the voting ticket from being tampered with.

Example ■ Composition of transparent ink Substance with supercooling property: 7 parts of potassium alum (fine powder) Binder: 20 parts of vinyl chloride resin Solvent: 73 parts of a mixture of 60 parts of cyclohexane and 13 parts of toluene The design was screen printed on high-quality paper using transparent ink.

When this was sufficiently dried, the design became completely invisible.

This printed paper is heated with a quartz infrared lamp with a length of 35 cm and an output of 1 KW at a scanning speed of approximately 5 cm/sec from a distance of 1 cm, and then toner for electrostatic copying is applied to print the design. When developed, the printed design appeared clearly, and it was revealed that it exhibited a tamper-proofing function.

Example II Composition of transparent ink Substance with supercooling property...Mixture of 3 parts of acetanilide and 1 part of phenacetin 4 parts Binder...Chlorinated rubber 10 parts Solvent...
・Mixture of 60 parts of toluene and 26 parts of ethyl acetate
86 copies A design was gravure printed on high quality paper using the above transparent ink.

When this was sufficiently dried, the design became completely invisible.

The printed paper was heated with a quartz infrared lamp with a length of 35 crn and an output of 1 KW at a scanning speed of approximately 5 cm/sec from a distance of 1 cm, and then toner for electrostatic copying was applied to develop the design. As a result, the printed design appeared clearly, and it was revealed that the printed pattern was tamper-proof.

Example III Composition of transparent ink Substance with supercooling property: 20 parts of potash alum Binder: 80 parts of rosin-modified phenolic resin offset ink medium Using the above transparent ink, a pattern is offset-printed on high-quality paper.

When this was sufficiently dried, the design became completely invisible.

When this printed paper was heated and developed in the same manner as in Examples I and II, the printed design appeared clearly and it was revealed that it exhibited a falsification prevention function.

Example IV Composition of transparent ink Substance with supercooling property: Benz triazole 5 parts Binder: Ethylcellulose (Standard Ethocel No. 22) 12
Part solvent: 83 parts of a mixture of 40 parts of ethyl alcohol and 43 parts of methyl ethyl ketone A pattern is gravure printed on high quality paper using the above transparent ink.

When this was sufficiently dried, the design became completely invisible.

When this printed paper was heated and developed in the same manner as in Examples (1) and (2), the printed design appeared clearly and it was revealed that the paper exhibited a tamper-proofing function.

As is clear from the above description, according to this invention, it is possible to easily detect that tampering has been done or that tampering has been attempted.

In addition, in the above explanation, an example was given in which a substance with supercooling property was included in printing ink, and characters, designs, etc. were formed directly on the card by printing, but the substance with supercooling property was used as printing ink. In addition to the structure, it can also be formed as a drawing material such as a paint or paint, and correspondingly, characters, designs, etc. can also be formed by coating or drawing.

Moreover, the characters, designs, etc. do not necessarily have to be directly formed on the card, but are first formed on the sheet 9 as shown in FIG. In short, there are no restrictions on the means as long as letters, designs, etc. can be formed on the card using a substance that has supercooling properties.

Furthermore, as shown in FIG. 6, the card base material 10 may be coated with a heat-resistant resin that does not have powder adhesion properties, such as ethyl cellulose or PVA, or other means may be used to cover the surface of the card with the resin. It may be composed of a layer 11, on which letters, designs, etc. may be formed using a substance having supercooling properties.

In this case, during development by applying toner after heating, the toner adheres to the undeveloped area 12 on the card 2, and the characters and
Prevents the contrast of images such as designs from decreasing,
In addition, it is possible to prevent the card from being soiled.

[Brief explanation of drawings]

Fig. 1 is an explanatory cross-sectional view showing a tamper-proof card according to an embodiment of this invention, Fig. 2 is an explanatory cross-sectional view showing the developed state of the pattern on the tamper-proof card shown in Fig. 1, and Fig. 3 is an explanatory cross-sectional view showing the tamper-proof card shown in Fig. Explanatory diagram showing the case where the invention is applied to pari-mutuel betting tickets, Part 4
FIG. 5 is an explanatory cross-sectional view showing another embodiment of this invention, and FIG. 6 is an explanatory cross-sectional view showing still another embodiment of this invention. 1... Tamper-proof card, 2... Card, 3... Design layer made of transparent ink, 5...
...Colored powder, 9... Sheet, 10...
... Card base material, 11 ... Resin layer.

Claims (3)

[Scope of utility model registration request] (1) At least a part of the surface layer of the card is made of a heat-resistant resin that does not have powder adhesion, and the heat-resistant resin is made of a supercooling substance with transparent or hidden letters or designs in the same color as the card. Or a tamper-proof card characterized by having a pattern or the like. (2) The tamper-proof card according to claim 1, wherein the characters, designs, or patterns are made of cedar bark by printing, coating, or drawing. (3) The characters, designs, or patterns are provided by being directly formed on the card, or by laminating, pasting, or gluing the sheet onto the base material of the card in the form formed on the sheet. The tamper-proof card according to claim 1 or 2, which is provided on the card.