JP2015223718A - Scratch card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which means to conceal confidential information in a scratch card is only a scratch hiding layer, allowing a dishonest person to produce a forged article of it or peep it easily, and the problem in which a scratch card provided with a hologram layer as the topmost layer developed to prevent forgery thereof allows a third person to visually recognize the hologram layer and allows a dishonest person to easily forge a scratch card with a similar optical effect.SOLUTION: The present invention provides a scratch card that achieves a high forgery prevention effect by hiding a hologram layer under a scratch hiding layer to conceal not only "confidential information" but also expression of a hologram reproduction image, thereby not allowing the confidential information and the hologram reproduction image to be visually recognized until the scratch hiding part is scratched.

Description

  The present invention is a scratch card provided with a scratch concealment layer and a hologram layer for concealing the secret information display part on the card substrate, the hologram layer and the cover layer covering the secret information display part on the card substrate The present invention relates to a scratch card in which the secret information can be concealed by providing a scratch concealment layer, and when the scratch concealment layer is scraped off by scratch, the secret information and the hologram reproduction image can be simultaneously viewed.

  Furthermore, when a laminate in which a hologram layer and a scratch concealment layer are provided on the card substrate is regarded as one “three-layer laminate”, the “hologram layer” It is in a state sandwiched between “scratch concealment layers” (meaning a so-called “sandwich” state).

In more detail, the upper surface and the lower surface of the “hologram layer” are covered with a “scratch concealing layer” and a “card base material”, respectively. The “exposed cross section” of “four sides” located at the end of “” is “exposed state”. (This “exposed cross section on all sides” means a so-called “cut section on all sides”, and is also expressed as “exposed cross section” and also a simple “cross section.” If the “hologram layer” is regarded as one “cuboid”, the “four sides” of the “six sides” constituting the “cuboid”, that is, the “upper surface, lower surface, and four side surfaces”. Is equivalent to the “exposed cross section on all sides”.)
In the scratch card of the present invention, among the four “exposed cross sections” of the hologram layer, “predetermined incident light” is “incident” from at least “one cross section”. The “incident light” passes through the “hologram layer”, is “diffracted” by the “first hologram” recorded in the “hologram layer”, and is reproduced by the “hologram layer”. It becomes “light” for reproducing the “image”, and further, this “light” propagates in the “hologram layer” (including propagating while being reflected by the upper and lower surfaces of the “hologram layer”). ”Of the“ exposed cross-section ”of the“ other cross-section ”becomes“ emitted light ”, and the person who observes this“ emitted light ”visually recognizes the first hologram reproduction image It becomes.

  Therefore, it is sufficient that at least two of the four “cross sections” are “exposed”, and the other two “cross sections” are covered with the “scratch concealing layer”. Also good.

Furthermore, of the four “cross sections”, only one “cross section” is “exposed”, a predetermined incident light is incident on the “cross section”, and the above-described emission light is emitted from the “cross section”. It is also possible to make it. (In this case, the “first reflection hologram” is recorded in the “hologram layer”.)
On the other hand, by irradiating illumination light onto the upper surface of the “hologram layer” (which means the surface of the exposed hologram layer by scratching the scratch concealment layer), the “second hologram reproduction” is performed from the “upper surface”. The “second hologram”, which is where the “image” is reproduced, is recorded in the “hologram layer”.

  This “first hologram” and “second hologram” can be said to be “perpendicular to each other” from an optical point of view, and “reducing the clarity of each other's image” for each reconstructed image. ”And“ distort the images of each other ”can be made relatively small.

  In the present invention, the “card base material” means a plastic card itself that can be provided with a secret information display section, or a sheet having various sheets, cards, and other shapes capable of recording secret information. The material may be a plastic material, a metal material, or any other material, but at least as the scratch card of the present invention, the secret information can be formed and concealed.

  Further, in the present invention, “secret information” means “information that should be disclosed only to rightful owners who can know the secret information”, and means for providing the “secret information” on the card base is , An appropriate printing method, a method using an ink jet method capable of forming individual information, and laser printing, etc., as well as any “information” that can be recognized at least visually, such as characters, figures, symbols, etc. Can be used.

  Of course, the “secret information” on the card base and another “information” carried by the scratch card (which may be confidential or disclosed), or those “information” The information may be synthesized by various information synthesizing means or the like (including encryption processing) to “form information disclosed to the right holder”.

  The portion where the “secret information” is provided on the card base is appropriately expressed as a “secret information” display unit, a “secret information” printing unit, or a “secret information” forming unit.

Further, in the present invention, “scratch” means an act of scraping the “target layer” with a coin, a nail, etc., and an act of partially or completely removing the “target layer”. To do. In particular, since the purpose is to visually recognize what is behind the “target layer”, even if “partial scraping” is used, all “target layers” in the “scored area” Is removed without leaving any shavings. (Hereafter, this scratch operation is also referred to as “scratch-off”.)
In the present invention, “optical mirror surface” means that the smoothness of the surface of a certain “layer” is substantially 0.01 μm to 0.1 μm in average surface roughness Ra. . Then, on the “certain layer” having the “optical mirror surface” on the surface thereof, the surface smoothness is maintained (meaning that the surface shape is not changed at all). When another layer is stacked, the interface between this “one layer” and “another layer” is an “optical mirror surface”.

  In the present specification, “parts” indicating blending are based on mass unless otherwise specified. The “hologram” includes those having a light diffractive function such as a diffraction grating.

(Main applications) In addition to the spread of communication networks and computer networks, the spread of computer terminals that transmit and receive data and their portability have progressed, and the proportion of tertiary industries in Japan has also grown rapidly, Furthermore, various services are also provided by public institutions.

  Tertiary industries include information and communications, transportation, postal, wholesale, retail, finance, insurance, real estate, goods rental, academic research or specialized technical services, lodging, food and beverage services , Life-related service industry, entertainment industry, education or learning support industry, medical or welfare-related business, electricity business, gas business, heat supply business, water service business, public service, barber beauty related business, complex service business, leisure service, rental service, outsourcing Services, transportation services, restaurant services, energy, entertainment, consulting, and other service industries are positioned as traders and public institutions involved in such tertiary industries, not only selling goods but also providing specific services. Since the company is also paying for it, the service to customers and consumers is different even when the goods are sold differently. To provide, or, customers and consumers (hereinafter, also referred to as customers, etc..) Fees and compensation from the (hereinafter also referred to as a fee, and the like.) Is often doing the recovery of.

  For example, as a method of collecting charges and consideration, a method of automatically deducting consideration corresponding to the service used from a bank account of a customer or the like, or a credit contract with a credit sales company in advance, The method of settlement of usage fees is a general form of collection of charges, etc., and is used for settlement of charges for public services such as electricity charges, gas charges, water charges, and various information provision services. Widely used as a method. In addition, the prepaid card sales form is also a popular way to collect charges for services that should be provided in the future. Collection of charges, fares, and other considerations Widely used.

  Furthermore, the “articles” to be sold are data terminal devices, personal computers, desktop PCs, online game machines, telephone line equipment, data line terminators such as facsimiles and modems, radio receivers, television receivers, etc. Devices (information devices), in particular portable communication devices (terminals) that are communication devices that can be carried and used, and portable information devices (terminals) that are portable and usable information devices, that is, portable music players, IC recorders , Portable DVD player, pocket computer, smart book, tablet PC, PDA, calculator, portable game console, digital camera, video camera, laptop computer, laptop computer, handheld computer, portable printer, portable scanner, portable modem, electronic dictionary, Electronic notebook, electronic book , Portable data terminal, mobile phone terminal, PHS terminal, pager terminal, portable radio, mobile TV, One Seg, wristwatch, pocket watch, hearing aid, handheld GPS, security buzzer, video phone, GPS receiver, car navigation terminal, remote control terminal , Electronic money, digital keys, digital locks, IC cards for digital cards, point cards, etc., which will be delivered to customers, such as music, movies, game software, etc. , Multimedia related content such as Web animation, etc. as these “articles”, download sales, cloud computing, music distribution, IP broadcasting, Internet broadcasting, Internet TV, Internet broadcasting network, Internet radio, podcast, Deo-on-demand, it is also widely used method of delivering using means such as a video sharing service.

  And, the “goods” that are the subject of these added values, and those that give customers “qualifications” and “rights” that can receive various “services” as described above, that is, their added value. Various types of cards are widely used as a medium for determining whether a person requesting receipt or use of a cardholder is a person who has a valid "qualification" or "right". It is used for.

  These cards are used in many fields as ID cards, membership cards, cash cards with a monetary value, credit cards, prepaid cards, commuter passes, coupon tickets, etc. Is steadily increasing. Among these, prepaid vouchers for providing services using the prepaid method, so-called prepaid cards, have a particularly high quantitative increase rate, and are widely used as prepaid amounts for a certain unit and value information for that amount can be used. It is popular.

  And on the card, value information and identification information are recorded as pattern or character information printed or printed on the card substrate, and a magnetic recording unit or optical recording unit provided on the card substrate, In some cases, it is recorded on the IC chip as machine-readable information, and various information corresponding to the application is held, and the information can be used in various situations.

  In a telephone card that can be said to be a representative of the prepaid card, value information and identification information are recorded on the telephone card itself, and each time the telephone card is used at a telephone terminal, the call charge is reduced from the value information recorded on the telephone card. However, after that, the balance was recorded again on the telephone card. After that, as a method for dealing with telephone card counterfeiting and alteration, only a random “number” was printed on the telephone card. The telephone card is assigned to the host computer that manages the issuance, registration, sale, use, deduction processing, deregistration, etc. of the telephone card. The so-called “scratch-off” that you can make a call for the amount of money used when accessing System telephone cards ", ie, a method of using the format telephone cards to be delivered the confidentiality of the permitted number (secret information.) Have been put into practical use, increasingly also the card issuing quantity.

  In this system, if a license number is leaked at the distribution stage, it will only cause troubles such as illegal service receipt by a person who obtained the license number illegally, and the inability to provide legitimate use to authorized buyers. In addition, there is no longer any means to determine whether the “actual use of the authorization number” is an act of an authorized purchaser or an act of an unauthorized person, and the fraudulent act cannot be specified. Therefore, it becomes impossible to specify the amount of damage and claim damages based on the specification.

  For this reason, after the permission number is printed on the telephone card, the permission number is temporarily covered with a concealable layer that can be scraped (scratched) in order to prevent the permission number from being easily stolen by a third party. This is a system in which a telephone card purchaser (authorized purchaser) scratches and removes the concealment layer, reads the concealment number concealed beneath it, and uses the concession number. Adoption of “off method” is indispensable.

  For example, as an access method for international calls, a contract is made with a telephone company (referred to as a relay company) that serves as a relay base, and by paying a predetermined amount (for example, 1,000 yen), the number unique to the contractor is described. When you make an international call, enter the access number displayed on the card (toll-free. This is secret information) to access the relay company, and then give it to the individual subscriber A system that allows you to make a call by entering the other party's phone number after entering your personal number, making an international call at a low charge, and sending a commercial for a specified time when you access a relay company As a method that can be used as a device, it is becoming widespread.

  When this system is joined, the personal number given to the individual is processed so that it is completely invisible from the outside by scratch processing (meaning concealment processing that can be scratched). The personal number appears for the first time by peeling.

  Conventionally, in event lotteries, game cards, etc., it is a hidden layer that can be used to scratch the result of lottery such as pictures, characters, numbers, etc. After being concealed, the concealment layer capable of scratching can be seen by rubbing the concealment layer capable of scratching with a nail or a coin so that the contents of the secret information displayed under the concealment layer can be seen. Printed prints are known. These prints are generally provided with a concealable layer that can be scratched at multiple locations, and one concealed layer that appears to be a “hit” is scraped off with coins, etc. The information display is visually confirmed. If two or more concealment layers are scraped off, the rule is often invalid.

In addition, tickets used for services in speed lotteries and fast food restaurants, etc., are printed with numbers and letters (secret information) on the card substrate, and then a concealable layer that can be scratched is printed on it. If the purchaser of the lottery or the person who received the ticket scrapes off the concealment layer using a nail or a coin, the numbers and letters printed on the base are not displayed. Appear. A system in which this number or character that appears is compared with a predetermined number or character, and if it matches, the winning is determined (the secret information is encrypted in a certain sense, it is encrypted information, and other information In other words, it is a mechanism in which “winning” is determined by collation, in other words, deciphering.) In addition, an instant lottery game card or instant lottery with secret individual data such as a lottery code hidden by a concealable layer that can be scratched In merchandise, etc., confidential individual data can be used for complex games, and when the concealment layer is scraped off, a message such as a letter of “around” or a prize number will appear. In addition, the “scratch method” is also used as a “simple lottery”, and it can be used for various lotteries such as lottery tickets and when purchasing products. There are means for providing free gifts, educational tools, game cards, etc. More specifically, at the mobile phone shop, 11 scratch frames are provided, and only 5 of them are rubbed, and your mobile phone number The number of prizes that can be matched is decided, and on the back side, special discount coupons for new contracts are attached, and used for scratches such as 5 times points for acquiring point card members at major drug stores Things to do, those that can be used as coupons from the day of membership registration, those that provide a coupon usage period, sealed in egg packs to major supermarkets at major egg makers, If you apply the ticket on a postcard and apply to the address listed on the back, you will receive a gift certificate that you can use at the place of purchase, a housing exhibition hall, a fast food shop , Amusement parks, sightseeing spots, sports watching, etc., food industry, fashion industry, beauty industry, medical industry, etc. A winning pattern is scratch-printed, and a lottery layer such as an instant lottery or a scratch lottery is formed by scratching the scratch pattern. When the mark can be put out, it is determined as “winning”, the number of times until the mark is put out, the level of “winning” (for example, product price) determined by the trajectory cut, the pattern is vertical and horizontal There are some which are provided in a grid and determine the level of “hit” depending on where the mark is located in the grid.

Also for scratch triangle lottery and fortune lottery, character lottery, toy lottery, lottery for food such as confectionery, lottery prize set such as lottery for daily necessities, prize set using dice, wheel tie Shooting prize set, toy fishing and thousand fishing prize set, holed treasure box prize set, gacha gacha and capsule prize set, easy-to-grid prize prize set, all-you-can-fill and ball case play prize set, seasonal lottery set and prize lottery set, For event prize sets such as summer fireworks prize set, summer festival gift lottery set, summer summer goods lottery set, Christmas prize lottery set, New Year prize lottery set, year-end and New Year prize lottery set, etc.
Furthermore, business card size and postcard size used for store events, such as shopping coupons and discount coupons to promote store visits, items that use scratches for direct mail of event guidance, postcards for guidance to stores In addition to scratch printing on crimped postcard DM such as V-fold and Z-fold, etc., scratching dozens of times once a day, depending on the number of times, at gift shops, furniture and clothes stores There are items that you can get for sale, items that are decided at the four corners of the scratch card, and those that are structured so that you can efficiently collect the items you want by referring to this .

With the spread of such “scratch method”, as “secret information”, not only simple “around” or “out of” characters, serial numbers and other numbers, but also barcodes, two-dimensional barcodes, etc. Machine recognition codes, customer data, messages, etc. All words / symbols, or specific marks, etc. are constructed in a fixed or variable form. Furthermore, these “information” uses a coloring mechanism or decoloring mechanism. Proposals have also been made of things that can be read out and those that can read the "secret information" only with a specific light source.
(Prior art) As mentioned above, automatic debits from bank accounts and payments through credit sales companies are very solid methods, but the prior procedures are cumbersome and until the service starts. However, for services that are indispensable to use such as public charges, even if it is an effective fee collection method, it is not always appropriate as a fee collection method for arbitrary services for customers. If the procedure for paying the fee is cumbersome, or if the user waits for several days before the service can actually be used, the customer is forced to use the service.

  For this reason, the fee collection method using a prepaid card is a very convenient method and is very effective depending on the service, i.e., in the same form as when purchasing ordinary goods, However, the so-called “prepaid card method” has been expanded since the prepaid card can be used from the time of purchasing the prepaid card, but on the other hand, the problem of forgery or alteration of the prepaid card In other words, since a general prepaid card uses a method of recording the remaining compensation magnetically, illegal use by the method of tampering with the magnetic recording has become widespread. Recognizing that the "prepaid card method" using records is a minor problem in terms of safety I wanted.

  For this reason, the card itself does not keep a record of the amount of money, only the “authentication number etc.” is kept as “secret information”, and the person who purchased the card gives the “number etc.” A new “prepaid card service” in which various services can be received by “declaring” has become widespread. Since this “number etc.” is concealed as “secret information” by a concealment layer that can be scratched, it is also called a number-type prepaid card compared to a conventional magnetic prepaid card.

  This number-type prepaid card includes communication systems such as public telephone cards, mobile phone cards, international telephone cards, payment systems such as game software, music software, and other paid software payment cards, shopping cards, gift cards, An article purchasing system such as a coin card has been put into practical use.

  The scratch card of the present invention is such a “card base material” such as a card provided with “secret information” with added value, that is, a “card base material” constituting the card or the like. For those with “secret information” on it, a scratch concealment layer is provided so as to cover the “secret information”, and the “secret information” is concealed from a third party. Only a person who has a legitimate right to receive the disclosure of “secret information” can confirm the “secret information” only after scratching the scratch concealment layer of the scratch card.

  As a technique for achieving this object, Patent Document 1 discloses that a person who purchases a card does not keep a record of the amount of money in the card itself but keeps only “authentication number etc.” as confidential information. A variety of services can be received by "declaring" the "number" etc. As a prepaid card service, a concealment layer etc. that can be scratched to conceal this "number etc." as confidential information A technique for concealing is disclosed.

  Also, scratches that are destroyed by printing information that you want to keep secret temporarily on a sheet with a printer, etc., and scratching on the upper layer of those secret information display parts, such as instant lottery tickets, secret information transmission cards, quiz cards, etc. “Scratch cards” formed by forming a possible concealing layer are already widely used, but since these concealable concealing layers can be formed from materials that are relatively easily available, It is easy to carry out alteration.

For example, at the pre-sales stage, a sales representative scratches and peels off the scratchable concealment layer of an instant lottery ticket such as a lottery ticket, and checks the lottery number and the winning lottery ticket in advance by looking at the lottery number. By re-creating a concealable concealment layer on the lottery number display area again, the camouflage can be seen so that it is restored to its original state and the fraud is not noticed. However, since it is also physically possible to engage in fraudulent activities such as making a specific customer make money by selling a winning lottery ticket to an acquaintance, as a countermeasure against this, A method has been proposed in which a capsule is inserted to determine authenticity. However, with this method, when a legitimate user scratches, it can be expected to have a promotional effect that appeals to the sense of smell such as the smell of roses, but after an unauthorized person scratches once, it can be scratched again containing the same fragrance. Even if a concealing layer is provided, it has been difficult for a legitimate user who has subsequently obtained to leave an improper trace that can be easily read visually. (For example, see Patent Document 2.)
As described above, as a method for directly preventing the camouflage action, a hologram layer on which a hologram image is formed is provided on the concealable concealing layer or across the concealable concealing layer and the card substrate, A technique has also been developed in which a person trying to cheat recognizes the existence of a hologram image and prevents cheating with the difficulty of forming a “hologram layer”. (For example, refer to Patent Document 3 or 4.)
However, since these technologies have disclosed the existence of the hologram layer and the hologram design to a third party in advance, the technology having an optical effect similar to that of the hologram reproduction image is forged over a sufficient amount of time. Originally, this configuration itself is designed to scrape the hologram layer and the scratchable concealing layer at the same time. While bringing in a modified product with no layer at all, it had the disadvantage of not preventing fraud such as acting as if it were a genuine product.

JP-A-10-214320 JP 2001-47777 A JP-A-11-34565 JP 2005-305844 A

  The present invention provides a scratch card in which “secret information” and a volume hologram layer on a card are concealed by a scratch concealment layer, and the hologram layer is provided behind the scratch concealment layer so that the presence of a hologram to a third party is provided. The hologram design can be concealed, and only after scratching the scratch concealment layer, the presence of the hologram can be confirmed, and after the scratch, the concealed secret information and its clear hologram design are layered. The present invention provides a scratch card that has both high designability that can be visually recognized and, further, the simplicity of authenticity determination that visually determines whether or not the hologram exists.

  That is, since the hologram design is not disclosed to a third party, even if an unauthorized person obtains a plurality of scratch cards of the present invention and knows the structure and existence of the hologram, the hologram design It is not possible to know whether it is the only design that is unified, a design that arbitrarily arranged multiple designs, or a specific hologram design corresponding to specific confidential information This principle provides a scratch card that makes it virtually impossible to make a “counterfeit product” for a scratch card having secret information other than the obtained scratch card.

  Furthermore, a hologram that is emitted and reproduced from the cross section by the illumination light incident on the cross section is recorded on the volume hologram layer, and before scratching the scratch concealing layer, it is a method that cannot be imagined by an unauthorized person. Provided is a scratch card capable of authenticity determination and extremely excellent in forgery prevention.

  In addition, the interface between the scratch concealment layer and the volume hologram layer is an “optical mirror surface” to ensure the clarity of the hologram reproduction image, making it very difficult to counterfeit it. When a card with a different average particle size is placed and the card is bent for an illegal purpose, the peeling trace is generated, and it is no longer possible to repair the peeling trace. To provide a scratch card capable of remarkably enhancing the prevention.

To achieve the above objective,
The first aspect of the scratch card of the present invention is:
A scratch card for concealing secret information provided on one surface of a card substrate, wherein a volume hologram forming layer and a scratch concealment layer are arranged in this order on at least a part of the surface so as to cover the secret information. Provided, the first volume hologram reproduction image based on the predetermined incident light is reproduced by the predetermined incident light incident on one of the exposed cross sections of the volume hologram forming layer, and Of the exposed cross section of the volume hologram forming layer, the first volume hologram reproduction image can be visually recognized from the outgoing light emitted from the other cross section, and the scratch concealment layer is removed by scratch. Thus, the secret information can be visually recognized.

According to the scratch card of the first aspect,
A scratch card for concealing secret information provided on one surface of a card substrate, wherein a volume hologram forming layer and a scratch concealment layer are arranged in this order on at least a part of the surface so as to cover the secret information. Provided, the first volume hologram reproduction image based on the predetermined incident light is reproduced by the predetermined incident light incident on one of the exposed cross sections of the volume hologram forming layer, and Of the exposed cross section of the volume hologram forming layer, the first volume hologram reproduction image can be visually recognized from the outgoing light emitted from the other cross section, and the scratch concealment layer is removed by scratch. Thus, it is possible to provide a scratch card characterized in that the secret information can be visually recognized. And it is possible to provide a scratch card that was difficult to corruption.

The second aspect of the scratch card of the present invention is:
In the scratch card of the first aspect,
By removing the scratch concealing layer by scratching, the secret information and the second volume hologram reproduction image reproduced by the volume hologram forming layer can be visually recognized.

According to the scratch card of the second aspect,
In the scratch card of the first aspect, by removing the scratch concealment layer by scratching, the secret information and the second volume hologram reproduction image reproduced by the volume hologram formation layer can be visually recognized. It is possible to provide a scratch card that is characteristic, and it is possible to provide a scratch card that makes it more difficult to look into the “secret information” and to counterfeit and alter it.

The third aspect of the scratch card of the present invention is:
In the scratch card of the first aspect or the second aspect, an interface between the scratch concealing layer and the volume hologram forming layer is an “optical mirror surface”.

According to the scratch card of the third aspect,
In the scratch card of the first aspect or the second aspect, it is possible to provide a scratch card characterized in that an interface between the scratch concealing layer and the volume hologram forming layer is an “optical mirror surface”. Thus, it is possible to provide a scratch card that can make a clearer hologram reproduction image appear and has improved anti-counterfeiting and design properties.

The fourth aspect of the scratch card of the present invention is:
In the scratch card according to any one of the first to third aspects, a copy-forgery-inhibited pattern printing is performed on a surface of the scratch concealing layer opposite to the surface on which the volume hologram forming layer is formed. It is characterized by.

According to the scratch card of the fourth aspect,
In the scratch card according to any one of the first to third aspects, a copy-forgery-inhibited pattern printing is performed on a surface of the scratch concealing layer opposite to the surface on which the volume hologram forming layer is formed. Thus, a scratch card with improved anti-counterfeiting and design properties can be provided.

The fifth aspect of the scratch card of the present invention is:
In the scratch card according to any one of the first to fourth aspects, the scratch concealing layer includes a pigment having an average particle diameter of 1.0 μm to 10 μm and a fine particle pigment having an average particle diameter of 0.01 μm to 0.1 μm. It is characterized by including.

According to the scratch card of the fifth aspect,
In the scratch card according to any one of the first to fourth aspects, the scratch concealing layer includes a pigment having an average particle diameter of 1.0 μm to 10 μm and a fine particle pigment having an average particle diameter of 0.01 μm to 0.1 μm. It is possible to provide a scratch card characterized in that the anti-counterfeiting property is significantly improved.

  The volume hologram forming layer formed with the volume hologram used in the scratch card of the present invention is a method of making a transparent film itself such as a photopolymer film a “volume hologram forming layer” having a volume hologram, or an appropriate method. A transparent substrate is coated with a photosensitive material such as a photopolymer to provide a “volume hologram forming layer” having a volume hologram, and immediately before scratching the volume hologram forming layer, the appropriate transparent substrate is formed. It can be obtained by a method of separating and using the material.

  As a card substrate used in the scratch card of the present invention, any material, that is, a plastic material, can be used as long as it can provide a secret information display portion and has adhesiveness with a volume hologram forming layer. Metal materials, ceramic materials, biomaterials, composite materials thereof, and those having a multilayer structure can be used.

  Also, the shape of the card substrate can be any shape, that is, a sheet shape, a film shape, a plate shape, a cube shape, a rectangular parallelepiped shape, a card shape, a postcard shape, a slip shape, an envelope shape, a disk shape, an ellipsoid shape, a sphere shape. , Rods, and combinations thereof, or those obtained by subjecting them to processing such as deformation, cutting, drilling, and adhesion can be employed.

  The thickness is not particularly limited as long as it can support the secret information display unit and can be handled, and is usually 3.0 μm to 3.0 mm. Of course, if it is an envelope shape or a box shape, the dimension of the three-dimensional shape is suitable for each application, and it is not necessary to be within this range.

  However, the secret information provided on the card base material is concealed by the scratch concealment layer, but the strength is high with respect to the card base material from the side opposite to the side provided with the scratch concealment layer. Irradiation with visible rays, infrared rays, ultraviolet rays, X-rays, etc., and particle beams such as electron beams (collectively referred to as “light rays”), the “transmission“ light rays ”” and “reflection” In order to counter the attempt to read the secret information itself from the "light rays" "and characteristic X-rays, etc., as a property of the card substrate, these" light rays "are" shielded "or" reflected ". Alternatively, it is desirable to have the property of “scattering”.

  As typical examples of these card base materials, card base materials and shapes used as so-called “prepaid cards”, card base materials and shapes used as “plastic cards”, particularly, JIS standards and ISO standards. There is something that is stipulated. That is, from the “general versatility” (including processing versatility), “card base material and shape used as“ plastic card ”defined by JIS standard or ISO standard” is desirable.

  These are already widely distributed and popular all over the world, so there is no resistance to handling and holding them, and peripheral devices when carrying or using them, Since related goods and the like are already popular, application to these items is also smooth and suitable.

  The “secret information” concealed by the scratch card of the present invention includes a personal identification number, personal authentication number, account number, other individual-specific number or symbol, lottery number or symbol, management number or symbol, or simply continuous Numbers and symbols that are effective when registered, the same number as a common key number that is an encryption key number, or a completely random number that is used as a scratch card base material. A person who is allowed to know the number, etc. that is generated when making it so that no one including the creator can know the contents of the number (meaning a regular purchaser etc. Of course, a scratch card system) Designator, scratch card issuer, etc. may also be included.) Only numbers that can be seen by others and those that cannot be physically seen by others There are symbols, and the like.

  Further, depending on the use of the scratch card, not only numbers or symbols but also characters, figures, marks, and others that can be commonly recognized by the individual and the supplier of the scratch card (this object is all so-called “information”). ) Can be used. The recognition method also has a recognizable method other than visual, for example, an optical reading method, a magnetic reading method, or any other physical or chemical reading method while having at least information that can be recognized by visual confirmation. The hologram reproduction principle was used both in the second volume hologram reproduction image that can be viewed with overlapping the secret information, and also in the first volume hologram reproduction image reproduced from the cross section. An optical reading method can be included, and any of them is suitable for improving the anti-counterfeiting property.

  As a method of providing this "secret information" on the card substrate of the scratch card, as a method for forming variable information, a thermal melt transfer method, a sublimation transfer method, an optical or physical direct drawing method, an electrophotographic method, and Examples of the method for forming fixed information include an ink jet method, a gravure printing method, an offset printing method, a letterpress printing method, an intaglio printing method, and a screen printing method.

  Alternatively, a method may be used in which the card base itself is made of a coloring material or a decoloring material, and variable information or fixed information is recorded using the coloring principle or decoloring principle.

  That is, an electron-donating leuco dye and an electron-accepting developer are formed on a card substrate made of a thermosensitive coloring material containing an electron-donating leuco dye and an electron-accepting developer, or on a paper material or film material that becomes a base paper. A card substrate in which a heat-sensitive color-developing layer containing a colorant is provided, and also in which a pressure-sensitive color-developing layer composed of a colorant and a developer contained in a capsule are provided on the base paper, are used. be able to.

  In addition, it is also possible to provide a thermal rewritable layer using a temperature sensitive material that can be operated repeatedly by coloring and decoloring, and a photo-rewritable layer using a photochromic material such as a fulgide type or spiropyran type. Increased properties are preferable.

  In particular, when these “rewritable layers” are provided and “secret information” is displayed, “secret information” appears only when the authorized purchaser confirms the “secret information”, and “hidden” otherwise. ”Can prevent the viewing of“ secret information ”by an unnecessary third party.

  As the thermosensitive coloring material, a system comprising a color former, a developer, and a sensitizer can be used. As the color developer, a phthalide compound such as benzoylleucomethylene blue, crystal violet lactone, etc., as a developer. 4-benzyl biphenyl, fluorene, etc. are used as sensitizers, and acids such as 4-4 ′ biphenol and 1-naphthol.

  Thermal recording is a mechanism in which a color former and a developer dispersed in a layer on a base paper are melted by heat and brought into contact with each other to cause color development. A sensitizer with a low melting point is added to increase the sensitivity. By combining various acid generation methods and this color development mechanism, rewritable thermal recording capable of repeated writing and erasing can be realized. . For example, by stacking a red thermosensitive recording layer that develops color with low thermal energy and a black thermosensitive recording layer that develops color with high thermal energy, recording in two colors of red / black is possible by using the applied energy properly. A two-color color thermosensitive recording material may be used.

  These leuco-based thermochromic materials and photochromic photochromic materials change their color development mechanism from “ultraviolet region or infrared region to visible region” and “change from visible region to ultraviolet region or infrared region”. The material can be used as an erasable recording material by selecting the material.

  When such a decoloring mechanism is used, after the authorized purchaser confirms the “secret information”, it is possible to erase the “secret information” promptly or at an appropriate timing according to the decision of the authorized purchaser ( It is possible to improve the anti-counterfeiting property.

  In addition, there is no particular restriction on the position or arrangement of the “secret information” on the card base material. However, when a thin and strong material such as a prepaid card is used, the card base material is Since it can be easily bent, it is desirable to avoid providing it at the center of the card substrate, and to provide it at the right end, left end, further upper end, or lower end. (This means that the deformation is not applied to the scratch concealment layer when it is bent.) Or, it is distributed in two or more places in a relatively unbent part when bent. May be.

  Also, the so-called “prohibited area” in the magnetic card specifications and IC card specifications (areas that prohibit printing, embossing, etc., such as magnetic area and IC area). It is an area that is prohibited from being provided.) Further, various processing processes applied to the card, such as embossing process, magnetic recording process, contact type IC chip processing process, non-contact type In the processing of IC chips and antennas, the sign panel processing, and the hologram processing, they are provided at positions where no problems occur.

  In addition to providing “secret information” at one position (meaning that something that can be read as one piece of information is solidified in one place), a plurality of positions are distributed on the card substrate. It is also preferable that it is provided on the front or back of the card base material because of its improved secrecy. Of course, in that case, it goes without saying that each scratch concealment layer is provided at each position.

  The “secret information” is formed on the card base material of the scratch card by the method or method described above, and the volume hologram forming layer and the scratch concealing layer are appropriately arranged to cover the “secret information”. After the scratch concealing layer is removed by scratching, the “secret information” can be visually recognized by the scratch card (meaning that “secret information” is visually recognized through the volume hologram forming layer having relatively transparency. ) Furthermore, at the same time that the “secret information” is visually recognized, the volume hologram reproduction image (second volume hologram reproduction image) reproduced from the volume hologram forming layer behind the scratch concealment layer can be visually recognized. By creating a card, the "secret information" can be visually read by a third party, or an unauthorized person can steal it. The prevent, and, the legitimate user to scratch the scratch concealing layer, it is possible to configure a scratch card that can be read the "secret information".

  Here, an adhesive layer is provided between the card base material and the “secret information” forming portion and the volume hologram forming layer to form a card base material, “secret information”, an adhesive layer, a scratch concealment layer, and a volume hologram. (This adhesive layer may be provided directly on the volume hologram forming layer in correspondence with the volume hologram forming layer, or the card base so as to cover the “secret information” forming portion of the card substrate. Furthermore, the size may be larger than the size of the volume hologram forming layer so as to cover the volume hologram forming layer << for example, the length x width is 1.1 times to 2.0 times each. As a result, the scratch concealing layer covers the cross section of the volume hologram forming layer, and the concealment of the volume hologram forming layer is improved. ” May be provided corresponding to the entire scratch concealment layer, provided that the entire cross section of two cross sections of the hologram forming layer, or a partial region of these cross sections << this region is incident light or outgoing light. To pass through at least.) To ensure proper scratching, and to ensure that the scratch is proper, and that the black color is behind the volume hologram forming layer, that is, between the volume hologram forming layer and the card substrate. (Of course, the area corresponding to the “secret information” forming part is provided so as not to hinder the visibility of the “secret information” forming part.) ”Can be made very clear (however, when the“ first volume hologram reproduction image ”is“ reproduced ”, the reproduction light (the process in which incident light becomes reproduction light and becomes emission light) In In the case where it is assumed that the reflected light is reflected at the interface between the volume hologram forming layer and the black layer at least once, the portion corresponding to the interface region to be reflected is also excluded.) .

  Any of them is advantageous in that it has the effect of improving the anti-counterfeiting property and improving the design property.

  In addition, the background pattern printing is performed between the scratch concealment layer and the volume hologram forming layer, and of course, the background pattern printing is also performed on the scratch concealment layer (on the uppermost layer) to improve the forgery prevention property, There is an effect of improving the designability, which is preferable.

  The volume hologram used in the present invention forms hologram images as patterns of various refractive indexes in the layer of the volume hologram forming layer (also referred to as hologram recording. The volume hologram forming layer is formed on a hologram recording medium. This means a recording layer when a hologram image is formed.) In the case of a so-called phase hologram, where the volume hologram is a transmission hologram, light is applied to the volume hologram forming layer to transmit it. When the phase of light is modulated by the “refractive index pattern”, the hologram reproduction image can be observed beyond that. Further, when the volume hologram is a reflection hologram, when light is applied to the volume hologram forming layer, the phase of the light entering the volume hologram forming layer is modulated by the “refractive index pattern”. The hologram reproduction image can be observed in the return light reflected at the same time.

The “volume hologram forming layer” of the present invention is regarded as one “cuboid”, and the shape of the upper surface and the lower surface thereof, that is, the “rectangular shape” having the predetermined “vertical” and the predetermined “lateral”, When the “distance” of the lower surface is defined as a predetermined “thickness” and is defined as a “cuboid” that is uniquely determined by “predetermined vertical” × “predetermined horizontal” × “predetermined thickness”
The volume hologram forming layer of the present invention has a “predetermined thickness” of 1/10 or less, particularly 1/100 or less of the “predetermined length” or “predetermined width”. It has a “thin sheet” shape.

  The four sides of the rectangular parallelepiped, that is, the four “volume hologram forming layer“ cross sections ”” are “predetermined vertical” × “predetermined thickness” ”and“ predetermined horizontal ”ד predetermined ”. It becomes a so-called “elongated rectangular” shape determined by “thickness of”.

  When the “volume hologram” is recorded through the “upper surface” or “lower surface” of the volume hologram forming layer, the shape is determined by the “predetermined vertical” and “predetermined horizontal”. The “volume hologram” is a “second volume hologram”, and the “volume hologram reproduction image” is a “second volume hologram reproduction image”.

  In addition, through one of the “cross section of the volume hologram forming layer” determined by the “predetermined vertical” × “predetermined thickness” and “predetermined horizontal” × “predetermined thickness”, When a “volume hologram” is recorded, the “volume hologram” is a “first volume hologram”, and the “volume hologram reproduction image” is a “first volume hologram reproduction image”.

  Therefore, the “first volume hologram” and the “volume hologram reproduction image” can also be referred to as a “cross section volume hologram” and a “section volume hologram reproduction image”, respectively.

  First, the “second volume hologram” and the “second volume hologram reproduction image” will be described in detail below.

  An “object” imaged as a hologram image (generally, a three-dimensional object or a two-dimensional object is used. Alternatively, an “optical system” can be used as long as it can provide “object light”. The “hologram reproduction image” from a separately prepared hologram may be illuminated by coherent light generated by a laser or the like, and the photosensitive recording medium is reflected (diverged) from this “object”. ). Each point on the “object” reflects light to the entire recording medium, and each point on the recording medium accepts light from the entire “object”. This reflected (diverged) light beam is called “object light”.

  At the same time, a part of the coherent light bypasses the “object” (means to pass through the “object”) and is directed to the recording medium by a reflecting mirror or the like. This light beam is called “reference light”.

  What is recorded on the recording medium is an “interference pattern” generated by the interaction between the “reference light” and the “object light” impinging on the medium, and this recording becomes a hologram.

  When this recording medium, that is, the recorded hologram is illuminated and properly observed, the light from the illumination light source (which becomes “illumination light”) is originally from the “object” to the recording medium. It is diffracted (transmitted or reflected) by the hologram so as to reproduce the wavefront that has arrived, so that the hologram creates a virtual image of the “object” to the viewer from the transmission or reflection side. Through the “window” of the recording medium, it is recognized as if a three-dimensional “object” having a complete perspective difference was seen.

  Next, the “first volume hologram” and the “first volume hologram reproduction image”, that is, the “cross section volume hologram” and the “cross section volume hologram reproduction image” will be described in detail below.

  The “first volume hologram”, that is, the “photosensitive recording medium” for recording the “cross-sectional volume hologram” (in the present invention, this is the “volume hologram forming layer”) is the case described above. In contrast, the “exposure surface” has a shape of “very elongated rectangle”, and the “distance” (that is, “thickness”) to the “back surface (rear surface)” having the same shape as the “exposed surface”. ”Is relatively large (meaning that“ depth ”is deep).

  Therefore, “object light” (same as above) for recording “hologram” is a predetermined optical system, that is, an optical system including a “cylindrical lens” having a predetermined size (vertical and horizontal size and lens radius). Or, using an optical system that includes a "convex lens", the "exposure surface" has a "very elongated rectangle" shape that is "relatively large and spreads vertically and horizontally". "Project".

  “Projection” at this time means that the information of “object light” that spreads widely in the vertical and horizontal directions is converged to the “exposure surface”, that is, one “cross section” of the “volume hologram forming layer”. To do.

  For example, it is assumed that the “object light” has a size of 30 mm in length × 30 mm in width, and that “the bottom surface” forming a rectangle has a size of 30 mm in length × 30 mm in width, Through the “cylindrical lens with a focal length of 500 mm”, the spread of the “object light” is compressed to a size of 0.1 mm in length × 30 mm in width (it becomes compression in the vertical direction), and a rectangular shape of 100 μm in length × 30 mm in width is formed. “The other cross section” of the “volume hologram forming layer” (“illumination light” for reproducing the hologram is called “the other cross section” because the reproduction light is emitted from this “cross section”. )) In a substantially perpendicular direction.

  The “compressed object light” that has passed through this “cross section” travels through the “volume hologram forming layer” as it is, and at a depth of 50 mm (the “predetermined lateral” length of the “volume hologram forming layer” is 50 mm)), 10 μm in length (1/10 in the longitudinal direction) × 30 mm in width, “further compressed object light”, facing the “other cross section” of the “volume hologram forming layer” It is emitted from “one cross section” at the position (“illumination light” for reproducing the hologram is referred to as “one cross section” because it is incident on this “cross section”). .

  The “cylindrical lens” described above is a plane (or a plane parallel to the plane) that bisects the “cylinder” or “ellipsoidal column” along the “circle diameter” or “ellipse major axis”. The divided “three-dimensional shape” has a size of “bottom surface” of 10 to 300 mm in length (direction perpendicular to the surface of the card base) × width 10 in accordance with the spread of “object light”. It will have a size of ˜100 mm (direction parallel to the surface of the card substrate).

  The “focal length” of the “cylindrical lens” (“focal length” is determined by the radius of the above “circle”, the length of the “ellipse” axis, and the refractive index of the constituent material. The "shape" can be defined directly by the radius of curvature, but here it is defined by the "focal length".

  Since the size of the “bottom surface” is a surface on which the spread “object light” is incident, the size of the “object light” is equal to the size of the “object light”, The “focal length” is “volume hologram forming layer” so that the “compressed object light” does not repeatedly reflect on the “upper surface” and “lower surface” of the “volume hologram forming layer”. The “object light” incident from “the other cross section” is determined by setting the “focus” at the “one cross section”.

  Of course, the position of the “focal point” may be set to a position beyond the “one cross section”, but if the “focal distance” exceeds 1000 mm, the optical system becomes too large, and the optical system It is not appropriate because it is easily affected by vibration.

  Also, if the “focal length” is less than 50 mm, the “top surface” and “bottom surface” of the “volume hologram forming layer” repeatedly increases reflection, and the influence of the disturbance of reflection on the “top surface” and “bottom surface” is affected. It becomes easy to receive and is inappropriate.

  However, if the “upper surface” or “lower surface” forms an “optical mirror surface” and unnecessary scattered light does not occur in repeated reflections, the “focal length” should be set small and the “volume” Generates “repetitive reflection” of the “upper surface” and “lower surface” of the hologram forming layer, and the “repetitive reflection” light also interferes with predetermined “reference light” as “object light” of the volume hologram to record. It is also suitable to do. Even in such a case, the “focal length” needs to be at least 30 mm so that the card base material and the optical system do not come into contact with each other.

Such “object light” and “parallel light” traveling in the same direction and perpendicular to each “cross section” as “reference light” are referred to as “object light” and the “reference light”. Then, interference is made in the “volume hologram forming layer” to record “first volume hologram (cross-section volume hologram)”.

  In the present invention, one exposed cross section (corresponding to “the other cross section” in the above description) of the “volume hologram forming layer” in which the “first volume hologram” is recorded in this manner is used. The “predetermined incident light” may be “parallel light” (“parallel beam light” having a predetermined diameter) having the same wavelength as the above-mentioned parallel light and a traveling direction “optically“ reverse ””. ) In the “Volume Hologram Formation Layer” while reproducing the “First Volume Hologram Reconstructed Image” based on the “Predetermined Incident Light” and proceeding through the “Volume Hologram Formation Layer”. However, the “light” carrying the “information” of the “first volume hologram reproduction image” (this is the emitted light) is opposed to the other exposed cross section (“one” in the above description) From the cross-section of “ Make.

The observer can visually recognize the “volume hologram reproduction image” from the “emitted light” emitted from the “other exposed cross section” without scratching the scratch concealment layer of the scratch card of the present invention. And authenticity can be determined. (Of course, the same “authenticity determination” is possible after scratch-off.)
The “projection” angle, that is, the “convergence” angle, is preferably set to be relatively small as the “opening angle”, and is 5 to 30 degrees, preferably 5 to 10 degrees.

  If this “angle” exceeds 30 degrees, the “object light” that has entered the “cross section” is focused until it passes through the “cross section” and travels the same distance as the “predetermined thickness”. It will be.

  Also, if this “angle” is less than 5 degrees, the “optical distance” from the “object” to the “cross section” becomes too large, making it unsuitable for hologram recording (such as vibration during hologram shooting). Which means the impact will be greater.)

However, the “optical distance” can be easily compressed by assembling an appropriate “optical system”, and the “object light” once connected to the “focus” is the “focus”. Then, the light travels through the “volume hologram forming layer” while being reflected by the “upper and lower surfaces of the volume hologram forming layer”, so that these “object light” and the above “reference light” are Interference also occurs in the area, and the “interference fringes” are recorded. (This "interference fringe" also contributes to the reproduction during hologram reproduction.)
Then, the “reference light” for recording the “hologram” is made “parallel light” in a predetermined optical system, and is incident substantially “perpendicular” to the “cross section”. However, it is assumed that it extends (advances) in the “depth” direction and reaches almost “vertical” with respect to the “back surface” described above.

  What is recorded on the recording medium is an “interference pattern” generated by the interaction between the “reference light” and the “object light”, and this recording becomes a hologram.

  When this recorded “first volume hologram” is “appropriately illuminated” and “appropriately observed”, “light” from the illumination light source (meaning illumination light) is derived from “object”. It is diffracted (transmitted or reflected) by the hologram so as to reproduce the wavefront that originally reached the recording medium, so that the hologram is Recognize a virtual image of an "object" as if it was seen from a three-dimensional "object" with a perfect perspective, as if spreading from the "window" of the recording medium (especially in the "thickness" direction). Let

  At this time, “appropriately illuminating” means having the same wavelength as that of “reference light” at the time of hologram recording, and using the same parallel light, the traveling direction is “optically reversed” from “reference light”. (It means that only “direction of travel” is different by “180 degrees”.) ”Means“ irradiating light ”and“ appropriately observed ”means“ object light ” This means that the object is observed from the position where the “object” is placed, and further from the position behind the position.

  In particular, when the “object” is a “thing” obtained by transmitting a “planar image” (transmission original or the like) with parallel light, an appropriate “screen” is arranged at the position of the “object”. An observation method of reading a “planar image” reproduced on the “screen” is also suitable.

  In particular, when a light source device (visible light semiconductor laser, light source wavelength 650 nm ± 10 nm, “beam diameter” several mmφ), which is usually used for a POS (“Point of Sale”) terminal reader, is used as the “illumination light”. Each of the volume holograms by “light (beam light)” that is incident on each position on the “cross section” by performing a raster scan on the incident “cross section” at a scanning speed of 50 to 100 scans / second. Reconstructed image (Partial reproduction is achieved by partially illuminating a part of the area to be reproduced. However, due to the “redundancy” characteristic of the “hologram recording and reproduction principle”, reproduction is also possible for each illumination. A considerable range of the entire image is reproduced, respectively), but is reproduced according to the scanning speed, and with the afterimage effect, the “whole reproduced image” as an observer Since that would be visible, which is preferable.

  Furthermore, the “cross section” of the “volume hologram forming layer” tends to be a relatively rough “rough surface” due to its formation process, and is different from the “optical mirror surface” described in detail below, with an irregular three-dimensional curved surface. The direction of travel of the “predetermined incident light” and “predetermined outgoing light” that pass through this “cross section” is uneven, but the “direction selection” that is the nature of the recorded “volume hologram” By virtue of “property” (the property that only the light traveling in the direction determined at the time of recording increases in intensity), a clear hologram reproduction image can be obtained.

  Of course, it is needless to say that this “cross section” is also preferably an “optical mirror surface” as described below.

  In the volume hologram forming layer used in the scratch card of the present invention, any of the above-mentioned “reflection hologram” or “transmission hologram” can be used as “second volume hologram” or “first volume hologram”. Can also be recorded.

  When a “reflection hologram” is recorded as the “second volume hologram”, when the scratch concealment layer of the scratch card of the present invention is scratched off, it is reflected by the volume hologram formation layer and returns to the observation side. The "volume hologram reproduction image" that comes is visible.

  When a “reflection hologram” is recorded as the “first volume hologram”, predetermined incident light is applied to one “cross section” of the “volume hologram forming layer” of the scratch card of the present invention. When irradiated, a “first volume hologram reproduction image” is emitted from the “cross section”.

  When a “transmission hologram” is recorded as the “second volume hologram”, the light transmitted through the volume hologram formation layer is reflected at the interface with the card substrate behind the volume hologram formation layer. The “volume hologram reproduction image” that is regularly reflected or light that is not absorbed at the interface with the black layer is regularly reflected and returned to the observation side is visually recognized.

  When “transmission hologram” is recorded as “first volume hologram”, predetermined incident light is applied to “one cross section” of “volume hologram forming layer” of the scratch card of the present invention. When irradiated, the “first volume hologram reproduction image” is emitted from the “other cross section” corresponding to the “back surface (opposite surface)”.

  A “transmission hologram” is a hologram formed by allowing “reference light” and “object light” to enter the recording medium from the same side so that they travel in substantially the same direction. By making the layer itself transparent, only the “phase distribution” is recorded.

  In this case, the interaction between the “object light” and the “reference light” in the recording medium forms a “fringe (interference fringe)” that is a change in the refractive index of the material whose refractive index changes. When the “object light” and the “reference light” are incident on the surface of the recording medium at a symmetric angle, the fringe is almost vertical. When the “object light” and the “reference light” are incident at an asymmetric angle, the fringe is slightly inclined with respect to the surface of the recording medium.

“Reflective holograms” are holograms formed by making “reference light” and “object light” enter the recording medium from the opposite sides so that they travel in substantially opposite directions, so-called “Lippmann”. Hologram ". (Hereinafter, a volume hologram that is a reflection hologram is also referred to as a “Lippmann hologram”.)
In this case, the interaction between the “object light” and the “reference light” in the recording medium forms a “fringe (interference fringe)” that is a change in the refractive index of the material whose refractive index changes. The surface is substantially parallel to the surface of the recording medium.

  When reconstructing this Lippmann hologram, each of these fringes acts as a “mirror” that reflects incident light back towards the observer, so that this Lippmann hologram is observed in “reflection” rather than “transmission” .

  The “hologram” formed in this way has a very high “wavelength sensitivity” (wavelength selectivity, meaning that it only acts on a specific wavelength), so “white light” is used for its reproduction. It is something that can be done.

  That is, light having a wide wavelength region (for example, a wavelength range of visible light wavelength [400 nm) can be easily obtained without preparing light of the wavelength used for the light source when the hologram is recorded and reproducing it with the light. Even if sunlight that covers up to 800 nm] or halogen lamp light is used as the reproduction light, light having a wavelength other than the “wavelength used for hologram recording” (“used for hologram recording”) Wavelength component other than “wavelength” means that the light is transmitted almost without undergoing a phase change, and only the light of “wavelength used for hologram recording” (meaning the corresponding wavelength component) is reflected, and the image of the light is reflected. (Lipman hologram reproduction image made by the corresponding wavelength component) can be visually recognized.

  In order to record these “reflection hologram” or “transmission hologram” in the “volume hologram forming layer”, as described above, the optical system is used to directly record the hologram on the “volume hologram forming layer”. Interference fringes can also be recorded. However, a “reflective hologram” or a “master hologram (“ unrecorded photosensitive material ”” and “recorded photosensitive material” in which a “transmission hologram” has been recorded in advance is used as a matching liquid. The “master hologram” is used to create a “volume hologram,” which means “reproduction master” for optical duplication, such as interposing and laminating and laser irradiation on both layers. It is also suitable to “replicate” the “forming layer” by optical means. Of course, the combination is also desirable.

  These “direct hologram recording” or “hologram recording by duplication” can also be applied to the “volume hologram forming layer” provided on the card substrate. Is used, or when individual hologram recording is performed on each scratch card.

  At the time of this recording, the state of the interface between the volume hologram forming layer and the card substrate, and further the black layer, that is, the state of light reflected from these interfaces, When observing the hologram reproduction image and determining its authenticity, the illumination light for observation (determination) has a great influence on the quality (that is, the definition of the volume hologram reproduction image). Since the volume hologram forming layer exposed by scratching off the masking layer passes through the exposed surface (interface between the scratch masking layer and the volume hologram forming layer), the state of this interface, that is, the state of light passing through this interface is This greatly affects the clarity of the volume hologram reproduction image.

  Among these, it is very important that the interface between the scratch concealing layer and the volume hologram forming layer is an “optical mirror surface”, and in particular, the exposed surface of the volume hologram forming layer after the scratch concealing layer is scratched off. Maintenance of “optical mirror surface” is an essential requirement.

  However, when a special effect such as “blurring effect” is given to the volume hologram reproduction image, the interface between these layers (scratch concealment layer and volume hologram formation layer, volume hologram formation layer and card substrate, It is also preferable that the volume hologram forming layer and the black layer have a “rough surface” of about 0.1 to 5.0 μm. For example, when this “roughening” treatment is performed on the surface of the card substrate, and further on the surface of the volume hologram forming layer, for example, two “surface-finished stainless steel plates” are formed on the card base. When the material itself or a card base material provided with a volume hologram forming layer is sandwiched and subjected to appropriate heating and appropriate pressure treatment, the "surface mirror finish" is referred to as "the above rough surface" It can be applied by sandwiching it in a stainless steel plate that is partially finished and has a surface mirror finish in other areas or a rough finish on the entire surface.

  A “holographic mirror” produced by the principle of hologram is the simplest of “reflection hologram”. This is a hologram in which two coherent plane waves are projected to the recording medium from opposite directions, and the two coherent plane waves intersect in the recording medium. This can be made by splitting a single laser beam and combining the two at the recording medium, or by projecting a non-split laser beam through the recording medium onto the “plane mirror” behind it. it can. As a result, a “set” of evenly spaced fringes is formed, arranged parallel to the bisector of the obtuse angle between the two projected lights, and having a trigonometric strength.

  If this obtuse angle is “180 degrees” and the wavefronts of the two projected lights are perpendicular to the plane of the medium, each fringe is parallel to the plane of the medium.

  When this obtuse angle is “180 degrees or less” or when the two lights are not perpendicular to the surface of the medium, the reflective fringes are formed at an acute angle with respect to the surface of the medium. The holographic mirror is characterized by its reflection efficiency, refractive index modulation, and the spectral band and spectral characteristics of the reflected light.

  Substantially horizontal fringes that form “reflection holograms” are harder to record than vertical fringes that form “transmission holograms”.

  The first reason is higher resolution, that is, more fringes are required per unit length, and the fringe spacing is very small. The “reflection hologram” requires about 3 to 6 times more fringes per unit length than the “transmission holoclam”.

  The second reason is the sensitivity of the horizontal fringes to the shrinkage of the recording medium. The shrinkage of the recording medium during exposure leads to the disappearance of the fringe, and if the shrinkage is severe, the formation of the hologram is hindered. This is in contrast to the case of “transmission hologram”. In “transmission hologram”, the shrinkage has almost no effect, or if the fringe is perpendicular to the surface of the medium, it has no effect. When tilted by more than 45 degrees from the surface of the media, only a relatively slight image distortion occurs.

  Therefore, it is preferable to use a reproduced image of a transmission hologram for authenticity determination.

  For such a volume hologram forming layer for forming a volume hologram, various transparent materials or transparent films are used.

  That is, there are silver salt photographic emulsions, dichromated gelatin, photoresists, photopolymer materials, photorefractive materials made of inorganic materials, photochromic materials, etc., and films made of these materials.

  A silver salt photographic emulsion is required to have high sensitivity and high resolution.

  As the photoresist, either a positive photoresist or a negative photoresist can be used.

  As the photopolymer material, a cross-linked photopolymer, a radical polymerization photopolymer, a cationic polymerization photopolymer, a chemically amplified photopolymer, a nanoparticle-dispersed photopolymer, or the like can be used, and its handling suitability is particularly excellent.

  Since the color tone of the photochromic material changes under a specific environment such as light or heat, the design property is further improved.

  Bichromated gelatin is a material selected for the production of “reflection holograms” because of its high refractive index modulation (ie, high diffraction efficiency and bandwidth compatibility). However, dichromated gelatin has a problem in storability and requires wet treatment after the formation of the “reflection hologram”. For this reason, this material must be newly prepared immediately before hologram recording, or pre-hardened gelatin must be used, reducing the image reproduction efficiency.

  Wet processing involves an additional step in forming the hologram and is subject to dimensional changes as the material swells and then contracts during processing. These dimensional changes affect the fringe spacing. Therefore, it is time consuming and difficult to produce a high quality “reflection hologram” with dichromated gelatin.

  For silver salt photographic emulsions or several dichromated gelatins that require several processing steps, solid photopolymerizable materials that require only a single processing step, i.e. photopolymer materials, are preferred. .

  Examples of photopolymer materials are solid photopolymerizable compositions that activate the polymerization of thermoplastic polymer binders, addition-polymerizable ethylenically unsaturated monomers, and unsaturated monomers. And a photopolymerizable composition having a refractive index modulation.

  Thermoplastic polymer binders are solvent-soluble thermoplastic polymers, but can be used alone or in combination with each other, such as acrylate and alpha-alkyl acrylate esters, polyvinyl esters, saturated and unsaturated. Polyurethane, butadiene and isoprene polymers and copolymers, epoxidized products, polyamides, and the like, and mixtures thereof can be used.

  Ethylenically unsaturated monomers include styrene, 2-chlorostyrene, 2-bromostyrene, methoxystyrene, phenyl acrylate, etc. as a single monomer or as a monomer that can be used in combination. Can be used.

  As the photoinitiator, a free radical generating addition polymerization initiator or the like can be used.

  As the photopolymer material, a photopolymerizable composition further having a fluorine-containing polymer, an addition-polymerizable ethylenically unsaturated monomer, and a photoinitiator can be used.

  Fluorine-containing polymers include polymers made from perfluorinated monomers and vinyl acetate, such as tetrafluoroethylene or hexafluoropropylene.

  Upon exposure with coherent light, this monomer (photo) polymerizes to form a high molecular weight photopolymer having a different refractive index and rheological properties than the unexposed areas. Although this high molecular weight photopolymer is substantially solid, each component is coherent until it is “fixed” by uniform irradiation with ionizing radiation and exposure over the entire surface or heat treatment at a high temperature. Internal diffusion occurs during and after exposure.

  This photopolymer reflects light having a predetermined center wavelength and wavelength region (dispersion band) determined by its thickness and refractive index modulation. The thickness is then matched to the application and the optical requirements of the optical system, ie the bandwidth of the light used to illuminate (reproduce) the hologram during use. In general, a relatively thick photopolymer is selected for narrow bandwidth applications, and a relatively thin photopolymer is selected for wide bandwidth applications.

The fluorine-containing polymer used is a fluorine-containing polymer that is compatible with the other components of the photopolymer and produces a substantially solid transparent film when applied.
“Substantially solid” means that the applied film has the properties (eg, dimensional stability) that solid materials generally have after removal of the solvent.

  The presence of fluorine in the fluorine-containing polymer generally lowers the refractive index of the photopolymer, thereby achieving increased (meaning “greater”) refractive index modulation in the photopolymer after holographic imaging. . Refractive index modulation increases with increasing fluorine content, but the amount of fluorine present is limited so as not to cause opacification of the photopolymer.

  Therefore, the content of fluorine is typically in the range of 10 to 20% although the effect is achieved even at a low level such as 1%. The fluorine content can be adjusted to achieve refractive index modulation depending on the application.

  Fluorine is introduced by copolymerizing another monomer constituting the fluorine-containing polymer with the fluorine-containing monomer or by reaction with the fluorine-containing polymer. For example, when the fluorine-containing polymer contains a functional group such as an alcohol or an acid substituent, a condensation, acetalization, ketalization, or esterification reaction can be used to introduce fluorine.

  As the fluorine-containing polymer, vinyl ester, vinyl alcohol, vinyl ether, vinyl acetal / butyral, or a polymer of a prepolymer or a mixture thereof and a fluorinated monomer can be used.

  A photopolymerizable composition comprising the above fluorine-containing polymer, an addition-polymerizable ethylenically unsaturated monomer, and a photoinitiator has high refractive index modulation while maintaining its transparency, and thus has high transparency. Therefore, the present invention is suitable for the scratch card of the present invention that requires clear hologram reproduction.

  Further, as a transparent resin, that is, a photopolymerizable composition, a cationic polymerizable compound, a radical polymerizable compound, a photo radical polymerization initiator system that polymerizes a radical polymerizable compound by being exposed to light of a specific wavelength, and the above A photosensitive material composed of a photo-cationic polymerization initiator system that is low-sensitivity to light of a specific wavelength and is sensitive to light of another wavelength to polymerize a cationically polymerizable compound is used.

  This photopolymerizable composition irradiates light such as laser light that is photosensitized by the radical photopolymerization initiator system, and then emits light having a wavelength different from that of the laser light or the like that is photosensitized by the photocationic polymerization initiator system. By irradiation, a Lippmann hologram is recorded. After the radical polymerizable compound is polymerized by irradiation with light such as laser light (hereinafter referred to as first exposure), the cationic polymerizable compound is converted into a photocation in the composition by the subsequent overall exposure (hereinafter referred to as post exposure). Cationic polymerization is performed by Bronsted acid or Lewis acid generated by decomposing the polymerization initiator system.

  As the cationically polymerizable compound, those which are liquid at room temperature are used so that the polymerization of the radically polymerizable compound is carried out in a composition having a relatively low viscosity. Examples of such a cationically polymerizable compound include diglycerol polyglycidyl ether.

  The radically polymerizable compound preferably has at least one ethylenically unsaturated double bond in the molecule. Further, the average refractive index of the radical polymerizable compound is larger than that of the cationic polymerizable compound, preferably 0.02 or more, and if it is smaller, the refractive index modulation becomes insufficient, which is not preferable. Examples of the radical polymerizable compound include acrylamide and methacrylamide.

  The radical photopolymerization initiator system may be an initiator system that generates active radicals by the first exposure for producing volume holograms, and the active radicals polymerize radical polymerizable compounds, and generally absorbs light. A sensitizer, which is a component, and an active radical generating compound or an acid generating compound may be used in combination. As the sensitizer in the radical photopolymerization initiator system, a colored compound such as a dye is often used to absorb visible laser light. However, in the case of a colorless transparent volume hologram, a cyanine dye is preferable.

  Since cyanine dyes are generally easily decomposed by light, the dyes in the volume hologram are decomposed and absorbed in the visible region by being left exposed for several hours to several days under room light or sunlight. A colorless and transparent volume hologram is obtained.

  Such colorless transparency not only improves the sharpness of the volume hologram reproduction image, but is also suitable for visually checking a tint block print or a design print provided behind the volume hologram forming layer.

  The cationic photopolymerization initiator system has low photosensitivity for the first exposure, irradiates light having a wavelength different from that of the first exposure, and then generates Bronsted acid or Lewis acid upon exposure to light. An initiator system for polymerizing the polymerizable compound may be used, and those that do not polymerize the cationic polymerizable compound during the first exposure are particularly preferable.

  The volume hologram forming layer has a thickness of 5.0 μm to 500 μm. Preferably, it is 30 μm to 100 μm. Of course, a thinner thickness is advantageous in terms of cost and transparency, but if it is less than 5.0 μm, sufficient light selectivity cannot be obtained, and a clear hologram reproduction image can be obtained. It is difficult to obtain.

  However, if it exceeds 500 μm, not only is it disadvantageous in terms of cost, but also the distortion of the hologram reproduction image due to thermal deformation during the processing becomes prominent, and its processing suitability also deteriorates.

  Since the above method can be formed directly from a resin without using an “appropriate transparent substrate” for supporting the resin, there is no need to coat the resin on such a transparent substrate in advance. In this case, the cost and management are excellent.

  However, if “appropriate transparent substrate” is used, the handling suitability is remarkably improved. Therefore, depending on the purpose and application of the scratch card of the present invention, it is preferable to use “appropriate transparent substrate”. is there.

  In that case, a laminated body provided with a “volume hologram forming layer” having a volume hologram by coating a transparent resin on one surface of the transparent substrate is once formed.

  The volume hologram forming layer is formed by applying a photopolymerizable composition coating solution (for example, solid content of 15 to 25%), bar coating, spin coating, dipping, or the like if the transparent substrate is in a sheet form. If the transparent base material is applied in a roll-like long state, it is applied by gravure coating, roll coating, die coating, or comma coating. The volume hologram forming layer is solidified by means of drying or curing according to the coating solution.

  In addition, in order to make the section of the “volume hologram forming layer” an “optical mirror surface”, a “laser cutting method” for cutting using a high-power laser cutting device such as a carbon dioxide laser or a YAG solid laser, After physically cutting with a very sharp cutting blade or the like, the “volume hologram forming layer” is cut to a predetermined size, and at least one cut surface is made an “optical mirror surface”. It is preferably provided by laminating on a card base material or by transfer forming.

  As an example of the photopolymerizable composition, 10 to 50% of the cationic polymerizable compound, 40 to 70% of the radical polymerizable compound, 1 to 5% of the radical photopolymerization initiator system, And it is good to make a photocationic polymerization initiator system into 1 to 5%, and it mix | blends so that the whole quantity may be 100%.

  The photopolymerizable composition is composed of essential components and optional components as they are, or as necessary, ketone solvents such as methyl ethyl ketone, ester solvents such as ethyl acetate, aromatic solvents such as toluene and xylene, methyl cellosolve, etc. It is prepared by blending with cell solvent, alcohol solvents such as methanol, ether solvents such as tetrahydrofuran and dioxane, halogen solvents such as dichloromethane and chloroform, and mixing in a cool dark place using a high-speed stirrer. .

  This photopolymerizable composition can reproduce a clear volume hologram while maintaining its transparency, and has a high breaking strength, a low breaking elongation, and a high pencil hardness. It is suitable for anti-counterfeiting applications that require high reliability such as tough physical properties such as tensile resistance and wear resistance.

  A sheet or film made of the photopolymerizable composition itself, or a photopolymerizable composition coated on a transparent substrate, that is, a volume hologram forming layer can be used to form a volume hologram using the method described above. it can.

  The volume hologram is a hologram recorded on the basis of the so-called volume hologram principle, as described above, with the interference fringes caused by the interference between the object beam and the reference beam. For example, a laser reproduction hologram such as a Fresnel hologram, an image hologram And white light reproduction holograms, color holograms utilizing these principles, holographic stereograms, computer generated holograms (CGH), holographic diffraction gratings, and the like. Further, like a machine readable hologram, the reproduction light may be converted into data by a light receiving unit and transmitted as predetermined information, or authenticity determination may be performed.

  In addition, recording the “first volume hologram” by recording from the “upper surface” (or “lower surface”) of the “volume hologram forming layer” using the CGH method is further facilitated by the ease of recording. preferable.

  Here, when the scratch concealing layer of the scratch card of the present invention is scratched off and a person who observes the exposed volume hologram forming layer is provided with “simple Lippmann hologram” on the entire surface of the volume hologram forming layer. In order to make it appear, in addition to transmission holograms that cannot be seen under natural light, at least one kind of reflection hologram that can be viewed visually under natural light, that is, a Lippmann hologram, is recorded in multiple recordings. It is essential that the reflection type hologram is recorded on top of the transmission type hologram that is a hidden hologram.

  At this time, reducing the transmission efficiency of the transmission hologram (corresponding to the diffraction efficiency when a diffraction grating is recorded as a hologram) to be smaller than the reproduction efficiency of the reflection hologram increases the concealment effect of the transmission hologram. Above, it is preferred.

  The volume hologram forming layer uses light such as laser light in a predetermined wavelength range by a so-called “holographic exposure apparatus” to polymerize the radical polymerizable compound and record interference fringes therein. At this stage, diffracted light by the recorded interference fringes is obtained and a volume hologram is formed. As the volume hologram forming layer, a cation polymerizable compound, a radical polymerizable compound, a photo radical polymerization initiator system, and a photo cation are used. In the case of using a photosensitive material comprising a polymerization initiator system, in order to further polymerize the unreacted cation polymerizable compound, the photocationic polymerization initiator system is exposed to light (for example, wavelength) as post-exposure. 200 to 800 nm) may be irradiated on the entire surface to fix the volume hologram. Note that the diffraction efficiency, the peak wavelength of diffracted light, the half-value width, and the like can be changed by treating the volume hologram forming layer with heat or infrared rays before post-exposure.

  The volume hologram forming layer on which the volume hologram is formed has its “layer” depending on the wavelength of the light source such as a laser used when the hologram is formed (this is the above-mentioned “reference light” or “object light”). Among them, fringes (interference fringes) are recorded "three-dimensionally" in the form of "partial change in refractive index (refractive index modulation)" (meaning that the entire fringe has a three-dimensional structure). It is.

  This fringe generates an “interference phenomenon” only when illuminated with the light source wavelength used at the time of hologram formation described above, and causes a reflection reproduction image (volume hologram reproduction image) that can be visually recognized by the observer.

  However, when this fringe is illuminated with light having a wavelength other than that described above, the “interference phenomenon” described above does not occur, and only a slight scattering phenomenon occurs, and the light is transmitted as it is.

  For example, when a volume hologram is formed using a solid-state laser (HeCd laser) having an oscillation wavelength of 442 nm in the visible light region and used as a volume hologram forming layer, the volume hologram forming layer has a thickness of 470 nm, 520 nm, or the like. Even if light from a light source having a different emission wavelength is projected to the visible light region, the volume hologram reproduction image is not reproduced and no reflected light is generated (slight interface reflection at the interface between the layer surface and air) Is present, but no light is reflected by the fringes.)

Any light source can be used as the light source used when forming these volume holograms as long as it oscillates (emits) coherent light in the visible light wavelength region. For example, as a gas laser, HeNe can be used. Laser LG series (oscillation (emission) wavelengths are 594 nm, 633 nm, 0.5 mW to 30 mW), HeNe laser LH series (same as 594 nm, 604 nm, 612 nm, 633 nm, 0.3 mW to 4.0 mW), argon laser (same as above) 488 nm, 40 mW), HeCd laser IK series (same as 442 nm, 20 mW to 200 mW), nitrogen / dye laser GL-301, nitrogen / dye laser GL-302 (selectable from 360 nm to 990 nm), etc. Ruby laser (same as 694n , Pulsed laser), small CW laser (Nd: YAG, Nd: YLF , Nd: YVO 4 laser) Direct (same, 405nm, 445nm, 447nm, 488nm , 638nm, 643nm, 655nm, 690nm), a small CW laser (same) As a semiconductor laser, such as Crystal (same as 473 nm, 593 nm, 657 nm, 660 nm, 671 nm), wavelength conversion laser Opti series (same as 488 nm, 589 nm), TOL90 dye laser (same as 420 nm to 900 nm), SWL- 7513H (same as 633 nm, 660 nm, 8 mW to 20 mW), FK LA-100 (same as 457 nm, 1 W), LDM (same as 405 nm, 440 nm, 473 nm, 635 nm, 665 nm, 690 nm, 10 W～200mW) or the like can be used.

  Among these, the use of a laser having an oscillation (emission) wavelength of 650 nm ± 10 nm makes it possible to correspond to the POS terminal described above, and to enable authenticity determination at the POS terminal of the scratch card of the present invention. Particularly preferred.

  In the scratch card of the present invention, “secret information” is provided on the card base of the scratch card, and a volume hologram forming layer, a scratch concealing layer, an adhesive layer, or a volume hologram is provided so as to cover the “secret information”. It is composed of a formation layer, a scratch concealment layer, or a volume hologram formation layer thereof, a surface pattern print provided on the scratch concealment layer, and a volume layer formation layer with a black layer added thereto.

  Here, the “black layer” may be formed corresponding to the entire area of the volume hologram forming layer area (of course, it is not provided in the area covering the “secret information” forming portion). You may form in what is called a "pattern shape."

  It goes without saying that the “adhesive layer” can be formed in the same manner with respect to the formation position and pattern of the “adhesive layer”.

  The volume hologram forming layer uses an offset printing method, gravure printing method, screen printing method, intaglio printing using a solvent that does not dissolve or alter the card base and “secret information” forming part or scratch concealment layer. Using a printing method such as a printing method, an inkjet printing method, a spin coating method, a curtain coating method, a photoresist processing method, etc., the thickness after drying is 5.0 μm to 500 μm, and further 30 μm to 100 μm. The thickness is formed on the card base and the “secret information” forming part or on the scratch concealing layer.

  Alternatively, a volume hologram forming layer is provided in advance on the “appropriate transparent substrate” with the above-mentioned thickness, and the exposed surface of the volume hologram forming layer (before or after volume hologram recording) It is possible to adopt a procedure in which the volume hologram forming layer is the outermost surface by peeling the “appropriate transparent substrate” at the interface with the volume hologram forming layer. However, also in this case, the above forming means can be used as appropriate.

  If this thickness is less than 5.0 μm, it is difficult to record volume holograms. If the thickness exceeds 500 μm, the balance with the thickness of the scratch concealment layer partially provided on the volume hologram forming layer deteriorates. Or, the total thickness of the scratch concealment part on the card base material of the scratch card (referred to a laminated part such as a scratch concealment layer or a volume hologram forming layer for concealing “secret information”) becomes too large. The scratch suitability and handling suitability are reduced.

  The volume hologram to be recorded may be a single hologram design or an assembly of a plurality of hologram designs. This “aggregate” may be an aggregate of holograms with different recording areas, or an aggregate of hologram multiplex recording with the same recording area.

  Furthermore, a reflection hologram, which is a Lippmann hologram, is recorded for viewing that is clearly visible at a normal observation angle. In addition, a transmission hologram is recorded at an angle (that angle) that is significantly different from the observation angle. It is also preferable to improve the anti-counterfeiting property of the scratch card of the present invention by performing multiple recording at a difference of 30 to 60 degrees and making it visible only at a special observation angle.

  The scratch concealment layer is a volume hologram forming layer in which a volume hologram forming layer is provided on the card substrate and on the “secret information” forming portion on the card substrate so as to cover the “secret information”. It is provided on or over the volume hologram forming layer (however, a part of “cross section” is exposed).

  Alternatively, a scratch concealment layer is formed on the volume hologram forming layer to form a two-layer laminate, and the two-layer laminate is then placed on the “secret information” forming portion on the card substrate. It is provided by laminating so that the formation layer forming portion covers “secret information” or by transfer forming.

  Therefore, when the exposed surface of the scratch masking layer is an “optical mirror surface”, the scratch masking layer may be partially dissolved or swollen as the ink composition of the volume hologram forming layer provided thereon. Use one that does not cause deformation or alteration.

  As the ink composition for the scratch concealment layer, for example, a resin component selected from rubber-based natural resins, diene resins, acrylic resins, and vinyl resins, in order to obtain concealability and scratch properties, What contains pigment components, such as a metal type fine powder and those oxidation fine powders, in the ratio of 20 to 80% of the whole solid content is used. Moreover, in order to improve the concealment property of a scratch concealment layer, you may contain 1-10% of pigment components with strong concealment property, such as barium sulfate and calcium carbonate. By configuring the scratch concealing layer ink composition from the above composition, both printability and scratch properties can be satisfied.

  The scratch concealing layer is obtained by diluting the ink composition with a solvent that does not cause the volume hologram forming layer and the card substrate to partially dissolve or swell, or cause deformation or alteration as described above ( Hereinafter, including this, it is referred to as “ink composition for scratch concealment layer”) using a printing method such as an offset printing method, a gravure printing method, a screen printing method, an intaglio printing method, an inkjet printing method, The thickness after drying is 5 μm to 50 μm, further 10 μm to 30 μm, and is formed on the substrate (on the “secret information” forming part) or on the volume hologram forming layer.

  At this time, the surface of the volume hologram forming layer is set as an “optical mirror surface”, and a scratch concealing layer is provided on the surface by taking the above-mentioned considerations or the like thereon, whereby the interface between the volume hologram forming layer and the scratch concealing layer is changed to “ Optical mirror surface ".

  If the thickness of the scratch concealment layer is less than 5 μm, the “secret information” may be seen through, and if the thickness exceeds 50 μm, the total thickness of the scratch concealment portion on the card base of the scratch card is still large. Too much. Further, if the thickness is 10 μm or more, the “secret information” is sufficiently concealed, and if it is 30 μm or less, the forming workability is excellent. Moreover, if the thickness of the scratch concealment layer is within this range, it can be easily pulverized with coins, fingers or nails.

  However, the interface between the scratch concealment layer and the volume hologram forming layer is a “passing surface” of the reflection hologram reproduction image, and passes through this interface “twice” to reproduce the transmission type or reflection hologram. In order for an image to appear, this interface needs to be an “optical mirror surface”.

  When the interface between the scratch concealing layer and the volume hologram forming layer is not an “optical mirror surface” but a so-called “rough surface that emits random scattered light”, this “rough surface When the "interface" is illuminated with illumination light for visually recognizing the volume hologram reproduction image, the "light phase" is disturbed, and the transmission and reflection type hologram reproduction images are interfered by the light with the same phase. The reproduction of the generated hologram itself is hindered, and the visibility of the volume hologram reproduction image is lowered. In some cases, even the existence of the volume hologram reproduction image cannot be confirmed.

  Such “optical mirror surface” means that the smoothness of the surface of the scratch concealment layer or the volume hologram forming layer is substantially 0.01 μm to 0.1 μm in average surface roughness Ra. It means that it is a `` smooth surface '' without irregular irregularities that deviate from the surface it should be, and if we dare to define it, `` It is a relatively small area and within that area it is almost It can be defined that the value of the average surface roughness Ra in a plane region that can be approximated to a plane is 0.01 μm to 0.1 μm in any region.

Usually, when the scratch concealment layer is formed on the base material (on the “secret information” forming portion) and the volume hologram forming layer using the printing method as described above, the outermost surface (exposed surface immediately after the formation) is , About 1.0 μm to 30.0 μm, and in some cases, the “roughness” is higher than that, and the “roughness” can be easily crushed with coins, fingers or nails, and is suitable for scratch-off. Is desirable. (Scratch-off means that the scratch concealment layer is partially removed by scratching with coins or claws.)
However, since the surface of the scratch concealing layer in contact with the volume hologram forming layer needs to be an “optical mirror surface” as described above for the purpose of the present invention, the scratch concealment is formed on an appropriate peelable film. After forming the layer, using a “surface-smoothed metal plate” or the like having a smooth surface equal to or greater than the “optical mirror surface” described above, heating at 100 to 200 ° C., and 10 ⁷ to 10 ^By pressing the plate at ⁹ Pa or by pressing the plate with a roll pressure of 1.0 kg or more against a roll width of 1 cm using a “metal roll that has been subjected to surface smoothing” or the like. The surface of the scratch concealment layer that is in contact with the volume hologram forming layer is defined as an “optical mirror surface”, and the volume hologram forming layer is provided while maintaining the “optical mirror surface” property of the surface. After formation, its suitable Peeling the Do peelable film, after placement in a predetermined position on the card substrate scratch card, it is also preferable to the procedure provided in the card substrate.

  At this time, before providing the two-layer laminate on the card substrate, an adhesive layer or a black layer is provided on the volume hologram forming layer, or an adhesive layer is further provided on the black layer. Alternatively, the exposed surface of the volume hologram forming layer may be an “optical mirror surface”, a black layer may be formed, and thereafter, the procedure may be similarly provided on the card substrate.

  For this reason, the physical characteristics of the “flat surface” of the scratch concealment layer or the “flat surface” of the volume hologram forming layer are the same in the volume hologram forming layer forming step and the scratch concealing layer forming step. Needs to be improved to “a level that can be maintained as an optical mirror surface”.

  For example, when a two-component curable resin or a thermosetting resin is used for the ink composition of the scratch concealing layer or the volume hologram forming layer, the flat plate or the roll itself is heated when the “flat surface” is formed. If the ionizing radiation resin is used for the ink composition of the volume hologram forming layer, the degree of cure near the “flat surface” is accelerated and completed, or after a flat plate or roll treatment, or a scratch concealing layer After the volume hologram forming layer is formed, ionizing radiation is further irradiated (post-cure), and the degree of cross-linking of the scratch concealment layer and the entire volume hologram forming layer is set to 98% or more.

  Furthermore, the flat plate or roll is manufactured using an ionizing radiation transmissive material, and the flat plate or roll is pressed against the volume hologram forming layer, and then sufficiently irradiated with ionizing radiation to obtain a “flat surface”. It is also preferable to improve the physical characteristics to the above-mentioned level while maintaining the “surface” shape with high accuracy.

  In any layer, not only the above printing method but also a roll coating method or a resist processing method is suitable for the above purpose.

  Alternatively, after the scratch masking layer is formed on the surface of the volume hologram forming layer with a predetermined thickness, in the “drying and further curing stage”, the scratch masking layer ink composition used for the scratch masking layer is used. In order to sufficiently move the pigment component and the resin component, the “drying condition and curing condition” may be set to a treatment time that is twice to ten times the normal treatment time. (It means that pigments with small particle diameters gather near the interface, or that resin components are sufficiently filled in the gaps between the pigments.) .)

  Of course, a scratch concealment layer is temporarily formed on an “appropriate film having an“ optical mirror surface ”in advance, and the surface of the scratch concealment layer in contact with the“ optical mirror surface ”is substantially “Optical mirror surface” is used, and this is “temporarily transferred (transferred)” onto an “appropriate temporary transfer film” to expose the “optical mirror surface”. Think of it as a “flat plate or roll”, press against the volume hologram forming layer and transfer it from the appropriate temporary transfer film (transfer of the scratch concealment layer) to reliably enhance the specularity of the scratch concealment layer. In a state where the volume hologram forming layer and the scratch concealing layer are laminated, the volume hologram forming layer side of the laminate is pressed against the “secret information” forming portion on the card substrate, or Its “secret” through the adhesive layer The method of laminating on a card substrate so as to cover the multi-address "is also preferred as a means which can be reliably obtained" optical mirror surface "in high accuracy.

  The black layer is composed of fine particle carbon black (primary particle size: 0.2 to 2.0 μm), ultra fine particle carbon black (primary particle size: 0.01 to 0.1 μm), other carbon black pigments and oxides. Black pigment fine particles and ultra fine particles, and further, pigments and dyes having absorptivity for the entire wavelength region of light to be observed (visible light), such as metal-containing black dyes (metal complex dyes), thermoplastic resins, Or it consists of what was disperse | distributed to the thermosetting resin (the content rate of a pigment or dye: 20-70 mass%), and it is 5 times-50 times of about 0.5 micrometer which is the wavelength of the light to observe. That is, it has a thickness of 2.5 μm to 25 μm, and further has a thickness of 10 to 40 times and a thickness of 5.0 to 20 μm, so that it passes through the volume hologram forming layer on which the reflection hologram is recorded. Light (reflective hologram replay Does not include the light for reproducing the image.) Almost all absorbed, the sharpness of the volume hologram reproduced image with extremely high. Alternatively, the light transmitted through the volume hologram forming layer on which the transmission hologram is recorded (including the light for reproducing the transmission hologram reproduction image) is absorbed in a pattern, and the hologram design of the volume hologram forming layer is further improved. It shall be highly designed.

  Furthermore, by adopting the various means described above, the surface of the black layer is made an “optical mirror surface”, and observation is performed at an angle that totally reflects on this surface (meaning an angle larger than the Brewster angle). The light can be reflected as “regular reflection light” and contribute to securing its anti-counterfeiting property.

  If the thickness is 5 times or less the wavelength of the observation light, light absorption is insufficient, and if it is 50 times or more, the thickness balance with the scratch concealing layer is deteriorated, which is inappropriate.

  When the surface of the black layer is an “optical mirror surface”, an ultrafine black pigment is used, and the ink is used using a device capable of highly dispersing the pigment with respect to the ink, such as a three-roll mill or a kneader. It is desirable to make it.

  As a method for forming the black layer, an appropriate method can be used for the formation pattern, such as an offset printing method and a gravure printing method, using the above ink. Furthermore, it is desirable to use a flexographic printing method in order to suppress bleeding and ink sag.

The position where the black layer is formed is behind the volume hologram forming layer, that is, the volume hologram forming layer and the card base (corresponding to the “secret information” forming part in order to make “secret information” on the card base visible. And may be formed as a size covering the entire surface of the volume hologram forming layer, or may be formed discretely in an appropriate pattern in a plurality of regions.
The forming method and the forming pattern shape are determined in consideration of the synchrony with the volume hologram design, the balance with each layer thickness, the refractive index difference of the resin layer to be used, and the adhesiveness.

  Further, when the volume hologram forming layer is provided so as to cover the “secret information” on the card substrate of the scratch card, an adhesive layer is provided between the card substrate (and “secret information”) and the volume hologram forming layer. Can be provided. Or, between the card substrate (and “secret information”) and the “volume hologram forming layer and scratch hiding layer” laminate, or “black layer, volume hologram forming layer and scratch hiding layer” laminate, An adhesive layer can be provided.

  By providing an adhesive layer, the adhesive strength between the card substrate and the “secret information”, the volume hologram forming layer, the scratch concealing layer (part), or the black layer can be increased. When the hologram forming layer is illegally peeled off, unnecessary scratch concealment layers and volume hologram forming layers can be prevented from being peeled off, and the “secret information” can be prevented from being altered or altered.

  The adhesive layer is formed with a thickness of 1.0 μm to 30 μm as a thickness after drying.

  As the ink composition for the adhesive layer, an ink composition that does not partially dissolve, swell, or cause deformation or alteration of the card substrate and “secret information” is used. Of course, when the ink composition for the adhesive layer is to be provided on the volume hologram forming layer, the scratch concealing layer (part) or the black layer, these layers are partially dissolved or swollen. Or a material that does not cause deformation or alteration.

  As the ink composition, any of solvent-based and water-based adhesives can be used. For example, vinyl acetate resin, acrylic resin, vinyl acetate-acrylic copolymer, rubber resin such as natural rubber, etc. Can be mentioned. Further, in order to obtain a material configuration that is naturally friendly, it is particularly preferable to use a material made from a natural material such as latex mainly composed of natural rubber.

  When the adhesive layer is less than 1.0 μm, the card base material of the scratch card and the adhesive property with “secret information” (the adhesive property with “secret information” means the “secret information” forming part If it exceeds 30 μm, it also affects the handling suitability.

  However, when the “secret information” is provided on the card substrate by the ink jet method, the height of the “secret information” printing portion (which means the rising of the printing portion) is as high as 5.0 μm to 20 μm. In this case, when the volume hologram forming layer or the scratch concealment layer is provided on the “secret information”, the adhesive layer is appropriately deformed so as to softly wrap the “high” printed portion. By absorbing the “height”, it is possible to prevent the rising pattern of the “secret information” printing part from being connected to the rising of the volume hologram forming layer or the scratch concealing layer. For this purpose, the thickness of the adhesive layer is set to the height of the “secret information” raised by the ink jet method (meaning the distance from the card substrate surface of the printing unit to the surface of the printing unit). It is preferable to set it to 0 times to 5.0 times, and it is inevitable that the upper limit of the above-described thickness is exceeded.

  If this thickness is less than 2.0 times the raised height, the absorbency becomes insufficient. If it exceeds 5.0 times, the thickness becomes unnecessary, and the physical strength of the card substrate itself. Will be reduced.

  As a method for forming the adhesive layer, it can be applied and dried by a method such as gravure coating, roll coating, comma coating or screen printing.

  The adhesive strength of the adhesive layer is determined by the 180 ° peeling method according to JIS Z0237 as the adhesive strength with the card base of the scratch card and the “secret information” forming part, and the peel strength at the interface with the scratch concealment layer. , 1.0 to 3.0 kg / 25 mm width is desirable. Of course, even higher peel strengths are suitable for the purposes of the present invention. In particular, the adhesive strength between the card base and the “secret information” forming part on the card base is determined so that the volume hologram forming layer and the scratch concealing layer (part) are provided on the card base and the card base. It is necessary to make it large enough to make it difficult to peel off from the “secret information” formation part, but from the peel strength at the interface between the adhesive layer and the card base and the “secret information” formation part on the card base. Also, the peel strength at the interface between the adhesive layer and the volume hologram forming layer is designed to be larger.

  In this way, the scratch hologram card base material, the “secret information” provided thereon, the volume hologram forming layer provided so as to cover the “secret information”, and further provided to cover those layers. A scratch card of the present invention comprising a scratch concealing layer is obtained.

  Alternatively, the card base of the scratch card, the “secret information” provided thereon, the adhesive layer provided so as to cover the “secret information”, the volume hologram forming layer (in addition, a black layer may be provided) And a scratch card of the present invention comprising a scratch concealing layer.

  In addition, when the scratch concealment layer is temporarily provided on an appropriate peelable film, a part of the surface of the peelable film (“the position of the“ secret information ”forming part that only authorized buyers can know”) Set as a “pattern” shape to be displayed, or provide a barcode, halftone dot, or checkered pattern) with an average surface roughness Ra of 1.0 μm to 30 μm or more. The “rough rough surface” can also make the breakability at the time of scratching uniform and easy, and contribute to the improvement of the appropriate scratch-off.

  Of course, when the scratch concealing layer is provided on the volume hologram forming layer, the above-described “rough rough surface” may be provided in advance on the printing plate. Further, after the scratch concealing layer is formed, the above “rough surface” is provided. It is also preferable that the outermost surface of the scratch concealment layer be a predetermined “rough rough surface” by heating and pressurizing using a flat plate or roll having a “rough surface”.

  Furthermore, even when such a “rough rough surface” portion is introduced at the interface between the scratch concealing layer and the volume hologram forming layer, it is suitable for improving the scratching suitability and design.

  Furthermore, the tint block printing is performed on the surface of the scratch concealing layer opposite to the surface on which the volume hologram forming layer is formed, on the interface between the scratch concealing layer and the volume hologram forming layer, or on the card substrate surface. In addition to improving anti-counterfeiting due to the presence of the “background pattern”, the effect of preventing forgery and alteration is also improved by simultaneously scraping the “background pattern” when it is illegally scratched. Can do.

  Also, the design of the tint block printing is set to straddle the boundary between the scratch concealing layer and the surface of the card substrate, and when the scratch concealing layer is peeled off, the portion straddling the boundary is set to be broken. It is also preferable to improve the anti-counterfeiting property.

  This tint block printing is a light-colored pattern or coloring print that is the background of the main design pattern, and you can use a single color printing ink, but in order to improve anti-counterfeiting, It is also preferable to use the printing ink. For this multi-color tint block printing, offset printing or gravure printing is also used, but special printing methods such as Orlov printing and Simultan printing are also suitable because of their high anti-counterfeiting properties.

  Orlov printing is letterpress multicolor collective printing, in which each color ink transferred to a partial plate (pattern roller) corresponding to each color ink is gathered on an intermediate roller, and then the ink from the collective roller. The inks are simultaneously applied to two letterpress plates. There are two methods: printing directly from the letterpress surface (Orlov printing) and printing after transferring ink to a rubber cylinder (blanket cylinder) (offset zummel). Although there is only one printing plate, the color can be changed to some color from the middle of one drawing line.

  Simultan printing is a method in which a plurality of printing plates (lithographic printing plates, resin printing plates, or relief printing plates such as metal printing plates) are arranged around a single rubber cylinder (bran cylinder), and ink from each printing plate is collected on the rubber cylinder. Then print. The printing position accuracy is almost determined by the mounting accuracy of the plate surface to the plate cylinder, and since there is little influence of expansion and contraction of the card base, high registration can be stably performed.

  The design for this background pattern printing is a figure that is used for decorative effects, such as "patterns" that are repeated regularly, "patterns" that include patterns with a crest, and other "patterns" that are used for dyeing and weaving. Designs repeated as “can be used.

  In particular, for the purpose of easily destroying the design due to scratches, it is also preferable to make the width of the image line very narrow and make it a “thin line” or “fine pattern” of about 30 to 100 μm. It is.

  The formation thickness of the “background pattern” in the background pattern printing is set to 1.0 to 10.0 μm.

  Here, since the surface of the scratch concealment layer is a “rough” surface, the tint block printing can be performed by using an inkjet method that can print following the unevenness, a thermal transfer method that is not easily affected by the unevenness, or a sublimation transfer method. May be performed. Furthermore, it is also preferable to use such a transfer method to perform printing only on the concave and convex portions of the scratch concealment layer so that the tint block printing can be destroyed very easily due to unauthorized scratches.

  In particular, the sublimation transfer method is preferable because it penetrates only into the resin layer constituting the scratch concealment layer to create a unique texture and it is difficult to counterfeit the same.

  In addition, it is also preferable to make the design of the tint block printing and the formation position the same on the upper and lower sides of the scratch concealment layer in order to enhance the unexpectedness and the anti-counterfeiting property.

  When the scratch concealing layer of the scratch card of the present invention contains both a pigment having an average particle diameter of 1.0 μm to 10 μm and a fine particle pigment having an average particle diameter of 0.01 μm to 0.1 μm, It is possible to leave a so-called “peel mark” on the scratch concealment layer when it is bent or bent for an unauthorized purpose, or when the scratch concealment layer portion itself is peeled off. The anti-counterfeiting property can be remarkably enhanced. In addition, once this “peeling mark” is generated, there is no means for repairing the “peeling mark”, so that the anti-counterfeiting property is remarkably enhanced.

  As described above, the pigment component included in the ink composition for the scratch concealing layer is 20 pigment components such as metal fine powder and oxide fine powder thereof (of course, nitride or other compound fine powder may be used). A pigment containing about 80% is used. As the pigment component, a pigment having an average particle size of 1.0 μm to 10 μm or a relatively large particle size, or a pigment group (“group” means mixing a plurality of pigments. Hereinafter, “pigment or pigment group” is also abbreviated and is also referred to as “pigment (group)”), and a fine particle pigment or pigment group having an average particle diameter of 0.01 μm to 0.1 μm is prepared. However, by using these mixed systems, the fine pigment (group) enters a gap between the pigment (group) having a large particle diameter, and the fine particle pigment (group) when the scratch concealment layer is subjected to extreme deformation. Pigment with large particle size Of it acts as a slip agent, easy and irreversible as to intralayer migration of large pigment particle size (meaning to cause plastic deformation.). Further, it is also preferable to add 1% to 5% of a slipperiness imparting agent such as silicone oil or talc in order to promote this “slip” effect.

  If the scratch card is "bently deformed" from 90 degrees to 180 degrees for an illegal purpose, the scratch concealment layer itself is similarly deformed, and one surface of the scratch concealment layer adheres to the card substrate and deforms. Since the deformation pressure is concentrated on the other surface of the scratch concealing layer, the above-mentioned plastic deformation is increased, irregular irregularities on the other surface of the scratch concealing layer, Irregular tears are generated, and the irregular irregularities and the irregular tears are visually recognized as “peel marks”.

  In order to generate such “peeling marks” more reliably, the ratio of the pigment (group) having a large particle diameter to the fine particle pigment (group) is set to 10: 1 to 10:30, particularly 10: 5. 10 to 10 is preferable.

  If the ratio of “fine particle pigment (group)” to “large pigment particle (group)” 10 is less than 1, “peeling marks” hardly occur in the scratch concealment layer. ) ”Exceeds 30, the“ peeling marks ”are hardly generated.

  Furthermore, the use of a fragile resin that is prone to cohesive failure as the resin used in the ink composition for the scratch concealment layer also ensures the generation of this “peeling mark”. This means that the scratch concealment layer is partially removed by scratching with coins or claws.

  Further, the ratio of the pigment (group) having a large particle diameter and the fine particle pigment (group) is blended as 10: 1 to 10: 5 in the ink composition to facilitate plastic deformation of the scratch concealing layer. This is also desirable when the outermost surface of the scratch concealing layer is subjected to a flat pressure press or roll press treatment as described above to obtain an “optical mirror surface”.

  Further, in a region other than the region where the volume hologram forming layer of the scratch concealing layer is laminated (meaning that the size of the scratch concealing layer is set larger than the size of the volume hologram forming layer. The volume of the scratch concealing layer. The portion protruding from the hologram forming layer is in direct contact with the card substrate.) The “predetermined pattern” change in the adhesive strength between the scratch concealing layer and the card substrate (for example, by changing the material of the adhesive layer) , “Strongly bonded part” and “weakly laminated part”, which means that the strength ratio is 2/1 to 5/1), or “secret” of the scratch concealment layer In a region other than the “information” forming portion, the scratch concealment layer is partially formed as a layer that is difficult to scratch, for example, in a letter form, that is, in a letter form such as “illegal” or “disclosure”. Tsu and Chi concealing layer volume hologram forming layer, it is also preferred that by fixing on the card substrate, and checks and balances against unnecessarily Attempts to scratch-off scratch concealing layer every inch.

  In this case, for example, the scratch concealment layer has a two-layer configuration of an upper layer and a lower layer, and when the lower layer of the scratch concealment layer is provided, it is fixed in advance to the volume hologram forming layer surface of the scratch card or the card substrate surface, and Using a resin layer having a strength (hardness) that cannot be peeled off by nails, etc., a “character pattern” is printed, and except for this pattern portion, a lower layer of a normal scratch concealment layer is provided. It is necessary to devise such as providing an upper layer of the scratch concealment layer so as to cover all of the above.

  When the scratch card of the present invention obtained in this way was observed from its appearance, the "secret information" covered by the scratch concealment layer and the volume hologram formation layer could not be visually recognized. By partially scraping off the scratch concealment layer of the scratch card with a coin, it was possible to simultaneously view the “secret information” and the volume hologram reproduction image from the volume hologram forming layer from the scraped area.

  In addition, the scratch concealing layer curves the card substrate of the scratch card of the present invention containing a pigment having an average particle diameter of 1.0 μm to 10 μm and a fine particle pigment having an average particle diameter of 0.01 μm to 0.1 μm, If the cross section of the scratch concealment layer is exposed (including the meaning of making it easier to see), the surface of the scratch concealment layer will generate “peeling marks”, leaving no traces of fraud. It seemed difficult not only to restore the card to its original state, but also to try to modify the scratch card.

  Furthermore, when the scratch concealment layer of the scratch card of the present invention is partially scratched off without knowing the position of the “secret information” forming portion therebelow, “secret information” does not appear in that area. It was obvious that all scratch masking layers were peeled off, and that it was not a scratch-off by an authorized purchaser. This seemed to have a restraining effect against a person who was not a regular purchaser of a scratch card practicing fraud such as peeping at “secret information”.

  According to the present invention, it is possible to provide a scratch card in which the “secret information” on the card and the volume hologram layer are concealed by the scratch concealment layer, and only after the scratch concealment layer is scratched off, In addition, it is possible to provide a scratch card that is capable of visually recognizing a volume hologram reproduction image at the same time as “secret information” and is excellent in unexpectedness and anti-counterfeiting.

  That is, since the hologram design is not disclosed to a third party, even if an unauthorized person obtains a plurality of scratch cards of the present invention and knows the structure and existence of the hologram, the hologram design It is not possible to know whether it is the only design that is unified, a design that arbitrarily arranged multiple designs, or a specific hologram design corresponding to specific confidential information By this principle, it is possible to provide a scratch card that makes it virtually impossible to make a “counterfeit product” for a scratch card having secret information other than the obtained scratch card.

  Furthermore, a hologram that is emitted and reproduced from the cross section by the illumination light incident on the cross section is recorded on the volume hologram layer, and before scratching the scratch concealing layer, it is a method that cannot be imagined by an unauthorized person. Provided is a scratch card capable of authenticity determination and extremely excellent in forgery prevention.

  In addition, according to the present invention, the interface between the scratch concealment layer and the volume hologram layer is set as an “optical mirror surface” to ensure the clarity of the hologram reproduction image, making it very difficult to counterfeit, When a card with a different average particle diameter is arranged in the scratch concealing layer and the card is bent for an illegal purpose, the peeling mark is generated, and it is no longer possible to repair the peeling mark. As a structure, a scratch card can be provided that can significantly improve its anti-counterfeiting property.

  Therefore, the present invention makes it possible to provide a new scratch card that is extremely difficult to counterfeit or alter, and prove that the card holder has a legitimate right in the tertiary industry, This is useful not only for applications such as “scratch lottery”, but also for applications that play the role of so-called “keys” in systems that provide high-priced products and services.

It is sectional drawing of the scratch card | curd H1 which shows one Example of this invention. (SEC1 and SEC2 are “one of the exposed cross sections” and “the other cross section of the exposed cross sections” of the volume hologram forming layer 3, respectively.) The figure which formed the volume hologram formation layer 3 and the scratch concealment layer 4 (in the figure, "rectangle") so that "secret information" 2 might be covered in the predetermined position of the card | curd base material 1 of the scratch card | curd 6 of this invention. It is. Here, (a) is the figure which looked at the scratch card 6 from the top, (b) is the AA sectional drawing. (The tint block print 5 is not shown.) The figure which printed "secret information: 12345678" <2> on the card | curd base material 1 of the scratch card | curd 6. FIG. (The frame surrounding "secret information" is only shown for convenience.) A volume hologram forming layer 3 and a scratch concealment layer 4 are formed at predetermined positions on the card substrate 1 so as to cover the “secret information” 2 (indicated by “rectangles” in the figure). FIG. 6 is a diagram in which a tint block print 5 is provided on the scratch concealment layer 4 (on the uppermost layer) of the scratch card 6. (In the figure, only the tint block printing 5 is highlighted and shown.)

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(Card base material and “secret information” forming part)
As the card substrate 1 used in the scratch cards H1 and 6 of the present invention, the “secret information” 2 display section can be provided, and the volume hologram forming layer 3 and the scratch concealment layer 4 are provided as the card substrate. 1, any material that can be provided on 1, that is, a plastic material, a metal material, a ceramic material, a biomaterial, a composite material thereof, and a multilayer structure or a more complicated combination thereof Things can be used. Moreover, an appropriate display by means of printing or the like according to the use of the scratch cards H1 and 6 of the present invention may be provided on the front and back surfaces. (See FIGS. 1 to 4. In FIGS. 2 to 4, “☆ scratch card ☆” or the like is printed on the surface of the card substrate 1, and this “print design” is printed on the scratch concealment layer 4. Or may be recorded on the volume hologram forming layer 3 as a “hologram design” for recording on the volume hologram forming layer 3.
The shape can be any shape, that is, sheet, film, plate, cube, rectangular parallelepiped, card shape (magnetic card, IC card, non-contact IC card, post card, greeting card, business card, point card, license. Card, play card, etc.), postcard shape, leaf shape, form shape, slip shape, S-mail shape, label shape, seal shape, securities shape, passbook shape, passport shape, postal shape, delivery shape , Envelope shape, bag shape, box shape, case shape, disk shape, disk shape, ellipsoid shape, sphere shape, curved surface shape, rod shape, and combinations thereof, and processing such as deformation, cutting, drilling, adhesion, etc. The thing which gave can be adopted. Furthermore, any industrial product or any product such as an electronic terminal or a portable terminal can be used as the card substrate 1.

  The thickness thereof is not particularly limited as long as it can support the “secret information” 2 display section and can be handled, and is usually 3.0 μm to 3.0 mm. Of course, if it is an envelope shape or a box shape, the dimension of the three-dimensional shape is suitable for each application, and it is not necessary to be within this range.

  However, the “secret information” 2 provided on the card base 1 is concealed by the scratch concealment layer 4, but the card base is provided from the side where the scratch concealment layer 4 is provided or from the opposite side. 1, visible light irradiation with a large intensity exceeding 1000 lux, infrared irradiation of 0.5 W / square centimeter or more, ultraviolet irradiation of 0.1 W / square centimeter or more, X-ray irradiation of 1 gil / minute or more, etc. Irradiate a particle beam such as an electron beam of 100 kV or higher (generally referred to as “light beam”), and “transmission“ light beam ”” or “reflection“ light beam ”, and further, characteristic X-rays, etc. Therefore, in order to counter the attempt to read the “secret information” and “position and shape of the scratch concealment layer 4”, as the property of the card substrate 1, these “light rays” can be “shielded” or “ Reflection " Or, it is possible to adopt the one that held the property of "scattering".

That is, for visible light irradiation, a highly concealable pigment that blocks or scatters visible light, a scale-like metal material, or a metal plate itself may be mixed in the card base 1. The base paper used for the card substrate 1 is coated, laminated, or combined (the above are collectively referred to as “mixed”). (Not shown)
For infrared irradiation, an infrared absorber or the like is further applied. For ultraviolet irradiation, an ultraviolet absorber or the like is further applied. For X-ray irradiation, a lead material or the like among metal plates is used. For radiation, the effect can be increased by mixing materials that absorb these particle beams.

Further, as representative examples of these card base materials 1, materials and shapes used as so-called “prepaid cards”, materials and shapes used as “plastic cards”, particularly JIS standards (“prepaid card JIS X 6310 series ", JIS X 6301, JIS X 6300 series, JIS X 6320 series, JIS X 6330 series, etc.) and ISO standards (ISO / IEC 7810 series, ISO / IEC 7816 series, ISO / IEC 14443 series, ISO / IEC 15457 series, etc.) )). (Not shown)
Among them, “general versatility” (including processing versatility. This “general versatility” means that a magnetic stripe composed of “protective layer / magnetic layer / adhesive layer” is embedded in a card base, "It means that production lines and production conditions such as laminates have been established.)" From "card base materials and shapes used as 'plastic cards' as defined by JIS and ISO standards" Is desirable.

  These are already widely distributed and popular all over the world, so there is no resistance to handling and holding them, and peripheral devices when carrying and using them (Means gate terminals for entrance / exit, station gate terminals, credit card terminals and other card-using devices) and related goods (means card holders for carrying cards, ornaments for cards, etc.) Etc. are already prevalent, and the application to these is smooth and suitable.

  In particular, an opaque film-like or sheet-like plastic is preferable in terms of its processing suitability and cost, and it is possible to reduce the thickness, and it also has mechanical strength, solvent resistance and heat resistance. It is done. For example, polyethylene terephthalate (PET), polycarbonate, polyvinyl alcohol, polysulfone, polyethylene, polypropylene, polystyrene, polyarylate, triacetyl cellulose (TAC), diacetyl cellulose, polyethylene / vinyl alcohol, polyvinyl chloride, polyvinylidene chloride And various plastic film materials. When these plastics are transparent, an opaque material such as titanium dioxide or calcium carbonate is added for the purpose of opacification. Moreover, a film-like or sheet-like plastic can be exemplified.

  Furthermore, a plastic film in which fluorine resin powder, silicon resin powder, or the like is mixed with these materials is preferable because of extremely high scratch resistance.

  The thickness of the card substrate 1 made of a plastic material in the form of a film or sheet is usually 3.0 μm to 1.0 mm, but is 50 to 300 μm from the processing appropriateness and handling appropriateness as the scratch card H1. It is desirable.

If this thickness is less than 3.0 μm, the processing accuracy when the volume hologram forming layer 3 is provided on the card substrate 1 or the scratch concealment layer 4 is provided is inferior. If the thickness exceeds 1.0 mm, it will be difficult to handle in sheet processing and winding processing, which is not preferable. (See FIGS. 1-4)
Specifically, a soft vinyl chloride sheet or a hard vinyl chloride sheet having a thickness of 50 μm to 1000 μm, or a combination thereof (meaning a laminate) is preferable.

  Under the present circumstances, what provided the adhesion layer and the black layer previously on the card | curd base material 1 may be used.

As the “secret information” 2 concealed by the scratch cards H1 and 6 of the present invention, characters, figures, symbols, patterns, marks, shapes, solids, or combinations thereof, or combinations of these and colors, etc. Furthermore, any identification information such as an identification code, an identification number, and an identification character, and any other means that can be identified are not particularly limited and can be adopted. (See FIGS. 1 to 3)
Examples of the identification means include visual identification, optical identification such as portable camera recognition and barcode recognition, machine identification, and other physical identification means.

  As long as they are identifiable, all of them may be the same or all of them may be individual, or may be unique to an individual, a company, or a specific industry.

  Moreover, it may be a shape, pattern or color of an article (including a part of the article), or a combination thereof that causes an aesthetic sense through vision, or a similar one, such as “design”. , Such as "trademark", a character, figure, symbol, three-dimensional shape, or a combination of these, or a combination of these and color, and used by a person who produces, proves or assigns goods as a business Or a person who provides or proves a service as a business, or may be similar to this. In addition, “title”, “trade name”, and a target to be collated in various scenes may be used.

  “Characters” include characters of all typefaces such as fonts and slave fonts, and “symbols” include special character symbols, emoticon symbols, electric character symbols, map symbols, etc. HTML symbols Symbols that are used only in limited scenes of limited industries such as, etc. are also preferred because of their particularity.

  In addition, English letters, Greek letters and other characters used in various countries, symbols, mathematical symbols, and the like are preferable because they cannot be memorized to the extent that an unauthorized person peeks at them instantaneously.

  Furthermore, only those who manage the operation of the scratch cards H1 and 6 by including hidden information or encryption information that cannot be discriminated by simple information reading means such as visual observation in these pieces of information are predetermined information processing means. Therefore, it is also preferable that such hidden information or encrypted information can be read.

  Those having such special characteristics may cause erroneous writing or erroneous input even in the case of registration or verification even by an authorized purchaser. Therefore, it is preferable to use automatic recognition means such as mobile camera recognition in combination.

  Hereinafter, these are collectively referred to as “numbers”.

  In addition, the “secret information” 2 includes a personal identification number, personal authentication number, account number, other individual-specific number, any individual number, lottery number, management number, etc., or just a serial number, etc. In addition, those that exhibit their effectiveness by registration, the same number such as a common key number that is an encryption key number, or a completely random number that is the card base of the scratch cards H1 and 6 A person who is allowed to know the number, etc., which is generated when the material 1 is produced and is devised so that no one including the creator knows the contents of the number (meaning a regular purchaser etc. Of course, the scratch card H1 , And 6 system designers, and the issuers of scratch cards H1 and 6 etc.) are numbers that can only be seen by others and cannot be physically seen by others. It can be included.

  Depending on the use of the scratch cards H1 and 6, not only the numbers described above, but also characters, figures, marks, etc., which can be commonly recognized by the individual and the supplier of the scratch cards H1 and 6 Any of the so-called “information” can be used.

The recognition method also has a recognizable method other than visual, for example, an optical reading method, a magnetic reading method, or any other physical or chemical reading method while having at least information that can be recognized by visual confirmation. In order to increase the anti-counterfeiting, it is also possible to include an optical reading method using a hologram reproduction principle such as a machine readable hologram in a volume hologram reproduction image that can be viewed with overlapping confidential information. is there. (The recognition method and means are not shown.)
As a method of providing these “secret information” 2 on the card base 1 of the scratch cards H 1 and 6, as a method of forming variable information, a thermal melting transfer method, a sublimation transfer method, optical or physical direct drawing There are a method, an electrophotographic method, an inkjet method, and the like, and methods for forming fixed information include a gravure printing method, an offset printing method, a letterpress printing method, an intaglio printing method, a screen printing method, and the like. (See FIGS. 1 to 3)
Of course, “secret information” 2 may be displayed on the display of the electronic terminal.

  Alternatively, a method may be used in which the card base 1 itself is made of a coloring material or a decoloring material, and variable information or fixed information is recorded using the coloring or decoloring principle.

  That is, on a card substrate 1 made of a heat-sensitive color developing material containing an electron donating leuco dye and an electron accepting developer, and on a paper material or a film material serving as a base paper constituting the card substrate 1, A thermosensitive color-developing layer containing a donor leuco dye and an electron-accepting developer is provided, and a pressure-sensitive color-developing layer comprising a capsule-containing color developer and a developer is provided on the base paper. Can be used as the card substrate 1.

  In addition, for the same purpose, a thermal rewritable layer using a temperature sensitive material or the like that can be operated repeatedly by color development and decoloring, or a photo rewritable layer using a photochromic material such as a fulgide type or a spiropyran type, for another purpose It is also preferable to provide it at a position for the purpose of merely displaying information because its unexpectedness and anti-counterfeiting property are enhanced.

In particular, when these “rewritable layers” are provided and “secret information” 2 is displayed, “secret information” 2 appears only when the authorized purchaser confirms the “secret information” 2, otherwise By making it “non-display”, it is possible to prevent the “secret information” 2 from being viewed by an unnecessary third party. (Various configurations of the card base 1 are not shown.)
As the thermosensitive coloring material, a system comprising a color former, a developer, and a sensitizer can be used. As the color developer, a phthalide compound such as benzoylleucomethylene blue, crystal violet lactone, etc., as a developer. 4-benzyl biphenyl, fluorene, etc. are used as sensitizers, and acids such as 4-4 ′ biphenol and 1-naphthol.

  Thermal recording is a mechanism in which a color former and a developer dispersed in a layer on a base paper are melted by heat and brought into contact with each other to cause color development. A sensitizer with a low melting point is added to increase the sensitivity. By combining various acid generation methods and this color development mechanism, rewritable thermal recording capable of repeated writing and erasing can be realized. . For example, by stacking a red thermosensitive recording layer that develops color with low thermal energy and a black thermosensitive recording layer that develops color with high thermal energy, recording in two colors of red / black is possible by using the applied energy properly. A two-color color thermosensitive recording material may be used.

  These leuco-based thermochromic materials and photochromic photochromic materials change their color development mechanism from “ultraviolet region or infrared region to visible region” and “change from visible region to ultraviolet region or infrared region”. The material can be used as an erasable recording material by selecting the material.

  Using such a decoloring mechanism, after the authorized purchaser confirms the “secret information” 2, the “secret information” 2 is erased promptly or at an appropriate timing according to the judgment of the authorized purchaser. It can be colored (erased) and its anti-counterfeiting property can be enhanced.

In this way, the “secret information” 2 forming portion is provided on the card substrate 1, and the volume hologram forming layer 3 is further formed so as to cover the “secret information” 2 forming portion. Is provided. (See FIGS. 1-2)
(Scratch hiding layer)
The “secret information” 2 forming portion is provided on the card base 1 of the scratch cards H1 and 6 of the present invention, and the volume hologram forming layer 3 is further formed so as to cover the “secret information” 2 forming portion. In addition, the scratch concealment layer 4 is provided to obtain the scratch card H1 or 6 of the present invention. (See Fig. 1 or Fig. 2.)
As the ink composition used for the scratch concealment layer 4 of the scratch card H1 of the present invention, a thermoplastic resin or a thermosetting resin can be used.

Thermoplastic resins include cellulose derivatives such as ethyl cellulose, cellulose nitrate, ethyl hydroxyethyl cellulose, cellulose acetate propionate, and cellulose acetate, styrene resins such as polystyrene and poly-α-methylstyrene, styrene copolymer resins, and polymethacrylic acid. Methyl, polyethyl methacrylate, polyethyl acrylate, polybutyl acrylate, and other acrylic or methacrylic acid ester homopolymers or copolymers, polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, polyvinyl Butylal resin, polybutadiene, styrene-butadiene copolymer, vinyl copolymer such as acrylonitrile-butadiene copolymer, rosin, rosin modified maleic acid resin, rosin ester resin such as polymerized rosin Coumarone resins, vinyltoluene resins, and polyamides, polyimides and the like. Further, a curing agent or the like may be mixed with these resins as long as the scratch-off property is satisfied to prevent unnecessary peeling or peeling of the surface of the scratch concealment layer 4 due to rubbing or the like. (See FIGS. 1-2)
Examples of the thermosetting resin include silicon resin, melamine resin, polyurethane, phenol resin, rosin-modified phenol resin, epoxy resin, unsaturated polyester resin, and the like. As a silicon resin and rubber-based natural resin, natural rubber, hydrochloric acid rubber, polyisoprene, polychloroprene, and the like can be used.

  Furthermore, it is also preferable to use a biodegradable plastic as the ink composition used for the scratch concealment layer 4 in consideration of the environmental influence in the act of scratching off.

  Biodegradable plastics include lactone resins such as ε-caprolactone, polybutylene succinate resins such as polybutylene succinate-adipate, and polylactic acid such as low molecular weight aliphatic dicarboxylic acids and low molecular weight aliphatics. Polyester resins synthesized from diol, mixtures of modified polyvinyl alcohol, aliphatic polyester resins and starches, etc., or polymers obtained by adding aliphatic isocyanates to low molecular weight aliphatic polyesters, are also natural products. Suitable are animal natural substances such as gelatin, plant natural substances such as cellulose, or microorganism-producing substances such as polyhydroxybutyrate.

  As an ink composition used for the scratch concealment layer 4, in order to impart concealability and scratch properties to the entire solid content including these resin components, metal-based fine powder (aluminum powder, brass fine powder, copper fine powder) Powder, etc.), oxide fine powders thereof, fine nitride powders, and other compound fine powders containing 20 to 80% of pigment components are used.

  Further, in order to further improve the concealing property of the scratch concealing layer 4, a pigment component having a strong concealing property such as barium sulfate or calcium carbonate may be contained in an amount of 1 to 10%. By configuring the ink composition for the scratch concealment layer 4 from the above composition, both printability and scratch properties can be satisfied.

The scratch masking layer 4 is prepared by diluting this composition with an appropriate solvent, such as an offset printing method, a gravure printing method, a screen printing method, an intaglio printing method, and an ink jet printing method so as to cover the volume hologram forming layer 3. Using a printing method, the thickness after drying is 5 μm to 50 μm, further 10 μm to 30 μm. (See FIGS. 1-2)
Further, as the ink composition for the scratch concealment layer 4, a metal paste, a resin material and an auxiliary agent dispersed in water and a lower alcohol to form an aqueous emulsion ink can be used. When the scratch concealing layer 4 is provided, it is preferable because unnecessary deformation and alteration are not given to the surface of the volume hologram forming layer 3.

  As the metal of the metal paste, bronze powder, which is an alloy of copper and zinc, or aluminum powder is used. Alternatively, an aluminum paste obtained by making aluminum fine powder and treating the surface with a fatty acid or the like into a paste with a hydrocarbon solvent having a high boiling point (mineral spirit or the like) may be used.

  In addition to the above, pigments for yellow, magenta, cyan, or black used for general printing inks, and extender pigments such as titanium white may be used as appropriate.

  As the resin material, polyurethane-based resin, polyacrylonitrile-based resin, polyacrylic acid-based resin, or the like can be used, and an aluminum paste or a color pigment is prepared by setting an emulsion of these resin materials to 25 to 50% of the ink composition. In addition, 10 to 35% of water and less than 5% of isopropyl alcohol are added and stirred to obtain an aqueous emulsion ink. An auxiliary agent such as an antifoaming agent, a surfactant, or a preservative can be added to this in an amount of 0.1 to 3%.

  For the formation of the scratch concealment layer 4 using this aqueous emulsion ink composition, a gravure printing method, a screen printing method, a flexographic printing method for printing via an anilox roller, or the like can be applied as a method suitable for full-surface printing or partial printing. .

  In addition, the ink composition for the scratch concealment layer 4 is obtained by dissolving a fragile resin that easily cohesively breaks in the layer in a solvent, and aluminum pigment (silver), brass powder (gold), copper as a concealing pigment. Metal powder such as powder (red), or a mixture of white extender pigments such as talc or kaolin, or a mixture of a colored pigment or dye appropriately mixed with this can be used.

  As the resin that is easily cohesive failure, a blend resin obtained by blending different kinds of resins at an appropriate blending ratio can be used. For example, polyethylene, ethylene-vinyl acetate copolymer (EVA), polypropylene, polystyrene, styrene-based polymer, A blend resin in which any two or more of resins such as styrene-butadiene rubber, various waxes, rosin, terpene resins, and terpene polymers are blended in an appropriate ratio can be used.

  As a solvent for dissolving this resin, toluene, methyl ethyl ketone, methyl isobutyl ketone, xylene, cyclohexanol, isobutyl acetate, cyclohexane, methylcyclohexanone, glycol derivatives such as ethylene glycol monobutyl ether, or a mixed solvent thereof can be used.

  As pigments used in the ink composition for the scratch masking layer 4, organic pigments such as quinacridone red magenta, anthraquinone red yellow, polyazo yellow, benzimidazolone yellow orange, and phthalocyanine pigment Copper phthalocyanine blue (α type, β type), copper phthalocyanine green, dissimilar metal phthalocyanine blue, selenium blue, azo pigments, soluble azo pigments (carmine 6B, permanent red 2B, etc.), insoluble azo pigments (disazo type, Monoazo, etc.), insoluble polycyclic pigments (red: quinacridone, perylene, diketopyrrolopyrrole, orange: perinone, perylene, diketopyrrolopyrrole, yellow: quinophthalone, isoindolinone, green: phthalocyanine, blue: phthalocyanine, in Dunslen , Purple: dioxazine, etc.), insoluble lake pigments (red: lake red C, watching red, etc.).

  Examples of inorganic pigments include complex oxide pigments, fine particle complex oxide pigments, bitumen, and hybrid pigments. In addition, petals, molybdenum red, cadmium red, red lead (and above, red), and yellow lead. (Red mouth), molybdenum orange (orange), cadmium orange (orange), ultramarine blue, Prussian blue, cobalt blue, cerulean, manganese blue (above, blue), amber (brown), yellow Lead, cadmium yellow, titanium yellow, yellow iron oxide (above, yellow), chromium oxide, cobalt green, viridian, peacock (above, green), Mars purple, cobalt violet, manganese violet (above, purple.), Etc. An extender pigment, a metal powder pigment, etc. are used.

  The particle diameter of these pigments is finished as a pigment (group) having an average particle diameter of 1.0 μm to 10 μm or a fine particle pigment (group) having an average particle diameter of 0.01 μm to 0.1 μm. In particular, the fine pigment (group) tends to agglomerate and needs to be redispersed.

  Of course, the ink composition for the scratch concealment layer 4 is selected in consideration of the adhesiveness with the volume hologram forming layer 3 and the card substrate 1.

  Furthermore, since the “part protruding from the volume hologram forming layer 3 of the scratch concealment layer 4 does not have to have a proper scratch-off property, the scratch concealment layer 4 is firmly adhered to the card substrate 1 when the scratch concealment layer 4 is scratched off. In addition, it may be designed as a portion remaining on the card substrate 1.

  Then, the remaining part of the fixed portion is replaced with “predetermined pattern”, that is, “illegal”, “peeps”, “shaved”, “disclosure”, etc. The anti-counterfeiting property can be enhanced as a “pattern to be expressed”.

  For this purpose, the scratch concealment layer 4 can be formed using the same printing method as described above.

However, in order to provide the above-mentioned “predetermined pattern shape” fixing portion, the formation of the scratch concealment layer 4 is divided into two stages. In the ink composition for scratch concealment layer 4 to which a curing agent or the like in the resin material is added at a predetermined ratio of about 2 to 5 times, it is once provided thinner than the target thickness (for example, 1 / of the target thickness). 5-3 / 5 etc.) In the second stage, the ink composition for the scratch concealment layer 4 is covered by the remaining thickness so as to cover the “predetermined pattern” portion (fill the other portion). A method of adding objects may be used.
(Volume hologram forming layer and tint block printing)
A “secret information” 2 forming part is provided on one surface of the card base 1 of the scratch cards H1 and 6 of the present invention, and a part of the card base 1 is covered so as to cover the “secret information” 2 forming part. The volume hologram forming layer 3 is provided. (See FIGS. 1-2)
At this time, the volume hologram forming layer 3 is laminated on the card substrate 1 or the volume hologram forming layer 3 is previously formed on the scratch masking layer 4 and the volume hologram of the scratch masking layer 4 is formed. The side where the formation layer 3 is provided is in contact with the side where the “secret information” 2 formation portion of the card substrate 1 is located, and the position of the “secret information” 2 formation portion and the scratch concealment layer 4 are After facing each other (meaning that the scratch concealment layer 4 conceals the “secret information” 2), it is provided by a procedure of laminating (that is, making it a laminate). it can. (The procedure is not shown.)
Further, in order to make the “cross section” of the volume hologram forming layer 3 an “optical mirror surface”, the volume hologram forming layer 3 is previously cut into a predetermined size by a method such as laser cutting, and the cut surface ( It is also preferable to perform the above processing after finishing the “cross section”) as an “optical mirror surface”. (The procedure is not shown.)
Further, the “predetermined incident light” to the volume hologram forming layer 3 and the “predetermined outgoing light” from the volume hologram forming layer 3 are not “light” parallel to the surface of the card substrate 1 but the surface thereof. In order to obtain an incident angle or an output angle of 10 to 60 degrees with respect to the angle, a “hologram“ reflecting mirror ”” (volume hologram) is formed in an area 1 mm to 10 mm inward from the “cross section” of the volume hologram forming layer 3. When recording interference fringes through “coherent parallel light” that form a predetermined angle with each other, the volume hologram becomes a “reflecting mirror” that reflects incident light like a mirror. In order to set the elevation angle to 10 degrees using this “reflection mirror”, to record the “reflection mirror” having a slope of 5 degrees with respect to the surface of the card base 1 and to set the elevation angle to 60 degrees. A slope of 30 degrees with respect to the surface of the card base 1 That means recording the "reflector".) To multiple recording.

  Alternatively, adjacent to the outside of the “cross section” of the volume hologram forming layer 3, it has the same thickness, the same horizontal width, and a length of 1 mm to 10 mm in the depth direction (meaning the vertical direction). It is also preferable from the viewpoint of ease of the process that “another volume hologram forming layer” is provided on the “incident light” side and the “emitted light” side, respectively, and the same volume hologram recording is performed.

  For the volume hologram forming layer 3, various transparent materials or transparent films are used.

  That is, a silver salt photographic emulsion, gelatin dichromate, a photoresist, a photopolymer material, a photorefractive material made of an inorganic material, a photochromic material, and a film made of these materials can be used.

  Silver salt photographic emulsions are required to have high sensitivity and high resolution, and ultrafine silver salts, gold-chalcogen sensitization, reduction sensitized materials, and the like can be used.

  As the photoresist, a novolak-DNQ-based or chemically amplified photoresist can be used as a positive photoresist, and a photocrosslinked photoresist or a photopolymerizable photoresist can be used as a negative photoresist.

  Silver salt photographic emulsion or dichromated gelatin has many processing steps and is complicated, but a solid photopolymerizable material, that is, a photopolymer material, is preferable because the processing step is only once.

  This makes it possible to create a stable, high-resolution hologram from a solid photopolymerizable film in one step, and “one-time exposure to a coherent light source with holographic information” It means that an “image” is obtained. The hologram formed in this way is fixed or enhanced rather than destroyed by subsequent uniform exposure to light.

  The photopolymer material comprises a thermoplastic polymer binder, an addition-polymerizable ethylenically unsaturated monomer, and a photopolymerization with refractive index modulation comprising a photoinitiator that activates the polymerization of the unsaturated monomer. Sex composition is used.

The thermoplastic polymer binder is a solvent-soluble thermoplastic polymer and is used alone or in combination. In particular,
[Acrylates and alpha-alkyl acrylate esters such as polymethyl methacrylate and polyethyl methacrylate,], [polyvinyl esters such as polyvinyl acetate, polyacetic acid / vinyl acrylate, polyacetic acid / vinyl methacrylate and hydrolysable poly Vinyl acetate; ethylene / vinyl acetate copolymer], saturated and unsaturated polyurethanes, butadiene and isoprene polymers and copolymers, epoxides, eg epoxides having acrylate or methacrylate groups, [polyamides, eg N-methoxy Methyl polyhexamethylene acylamide], [cellulose esters such as cellulose acetate, cellulose acetate succinate and cellulose acetate butyrate], [cellulose ether such as methyl Cellulose, and ethyl cellulose], polycarbonates, and, [polyvinyl acetals such as polyvinyl butyral and polyvinyl formal] and the like.

  Particularly preferred are cellulose acetate lactate polymers, polymethyl methacrylate, acrylic polymers and prepolymers including methyl methacrylate / methacrylic acid and methyl methacrylate / acrylic acid copolymers, methyl methacrylate / acrylic acid or methacrylic. Acid (C2-C4) alkyl / acrylic acid or methacrylic acid terpolymers, polyvinyl acetate, polyvinyl acetal, polyvinyl butyral, polyvinyl formal, and the like, and mixtures thereof.

  In addition, polystyrene, poly (styrene / acrylonitrile), poly (styrene / methyl methacrylate), and polyvinyl pendels, and mixtures thereof can also be included.

  The ethylenically unsaturated monomer may be styrene, 2-chlorostyrene, 2-bromostyrene, methoxystyrene, phenyl acrylate, as a single monomer or as a monomer that can be used in combination. P-chlorophenyl acrylate, 2-phenylethyl acrylate, 2-phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, phenol ethoxylate acrylate, 2- (p-chlorophenoxy) ethyl acrylate, benzyl acrylate, acrylic acid 2- (1-naphthyloxy) ethyl or dimethacrylate, 2,2-di (p-hydroxyphenyl) propane dimethacrylate, polyoxyethyl-2,2-di (p-hydroxyphenyl) propane dimethacrylate, bisphenol-A Di (2-methacryloxyethyl) Ether, ethoxylated hisphenol-A diacrylate, bisphenol-A-di (3-acryloxy-2-hydroxypropyl) ether, bisphenol-A-di (2-acryloxyethyl) ether, tetrachloro-bisphenol-A-di (3-acryloxy-2-hydroxypropyl) ether, tetrachloro-bisphenol-A-di (2-methacryloxyethyl) ether, tetrabromo-bisphenol-A-di (3-methacryloxy-2-hydroxypropyl) ether, tetrabromo- Bisphenol-A-di (2-methacryloxyethyl) ether, diphenolic acid-di (3-methacryloxy-2-hydroxypropyl) ether, 1,4-benzene fold dimethacrylate, 1,4-diisopropenylben Emissions, benzoquinone monomethacrylate, and acrylic acid 2- [beta-(N-Karubajiru) propionyloxy] ethyl and the like, can be used.

  One or more moieties wherein the monomer is selected from the group consisting of substituted or unsubstituted phenyl, phenoxy, naphthyl, naphthoxy, heteroaromatic having up to three aromatic rings, chlorine, bromine When it contains, the photopolymerizable composition containing these can be called a “monomer orientation type system”.

  Suitable monomers for this monomer-oriented system include 2-phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, phenol ethoxylate acrylate, 2- (p-chlorophenoxy) ethyl acrylate, and acrylic acid. p-chlorophenyl, phenyl acrylate, 2-phenylethyl acrylate, bisphenol-A-di (2-acryloxyethyl) ether, ethoxylated hisphenol-A diacrylate, and 2- (1-naphthyloxy) ethyl acrylate, It is.

  And ethylenically unsaturated carbazole monomer; 2-naphthyl acrylate; interchlorophenol acrylate; bisphenol-A diacrylate; 2- (2-butyoxy) ethyl acrylate; and N-phenylmaleimide It may be used by mixing with a second solid monomer.

  Also, a preformed polymer material (meaning a prepolymer) consists of substituted or unsubstituted phenyl, phenoxy, naphthyl, naphthoxy, heteroaromatic having up to 3 aromatic rings, chlorine, bromine If it contains one or more moieties selected from the group, the photopolymerizable composition comprising these can be referred to as a “binder-oriented system”.

  Monomers used in this system are those that do not contain phenyl, phenoxy, naphthyl, naphthyloxy, heteroaromatics with up to 3 aromatic rings, no moieties taken from the group consisting of chlorine and bromine .

  Suitable monomers for the “binder oriented system” are liquid, ethylenically unsaturated compounds that can undergo addition polymerization and have a boiling point higher than 100 ° C. Suitable monomers of this type that can be used as a single monomer or in combination with other monomers include:

  That is, butyl acrylate, cyclohexyl acrylate, isoformyl acrylate, 1,5-bentanediol diacrylate, N, N'-ethylaminoethyl acrylate, ethylene glycol diacrylate, 1,4-butanediol diacrylate, diethylene glycol Acrylate, hexamethylene glycol diacrylate, 1,3-pronodioldiol acrylate, decamethylene glycol diacrylate), 1,4-cyclohexanediol diacrylate, glycerol diacrylate, trimethylolpropane diacrylate, pentaerythritol triacrylate , Trimethacrylate, pentaerythritol tetraacrylate, triethylene glycol diacrylate, triethylene glycol diacrylate Tacrylate, polyoxypropyltrimethylolpropane diacrylate, butylene glycol dimethacrylate, 1,3-propanediol dimethacrylate, 1,2,4-butanetriol trimethacrylate, 2,2,4-trimethyl-1,3-propanediol Dimethacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, trimethylolpro JR trimethacrylate, 1,5-bentanediol dimethacrylate, diallyl fumarate, perfluorooctyl acrylate, fluorooctyl methacrylate, and 1-vinyl-2 -Pyrrolidinone and the like.

  In addition to the above ethylenically unsaturated monomer, it may also contain one or more free radical initiated, chain-grown, addition-polymerizable, ethylenically unsaturated compounds having a molecular weight of at least 300.

  Also, the monomer is alkylene or polyalkylene glycol diacrylate prepared from alkylene glycol of 2 to 15 carbon atoms or polyalkylene ether glycol of 1 to 10 ether bonds, and when present as a terminal bond, It may have an addition-polymerizable ethylene bond.

  Further, decanediol diacrylate, iso-bornyl acrylate, triethylene glyfur diacrylate, diethylene glycol diacrylate, triethylene glycol dimethacrylate, ethoxyethoxyethyl acrylate, triacrylate ester of ethoxylated trimethylolpronone, etc. . Further, it may be used by mixing with a second solid monomer of the same type, for example, N-vinylcaprolactam.

  Suitable free radical generating addition polymerization initiators as photoinitiators are substituted or unsubstituted polynuclear quinones that are compounds having two endocyclic carbon atoms in a conjugated carbocyclic ring system, such as 9,10-anthraquinone, 1-chloroanthraquinone, 2-chloroanthraquinone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tertiary-butylanthraquinone, octamethylanthraquinone, 1,4-naphthoquinone, 9,10-phenance Lenquinone, 1,2-benzanthraquinone, 2,3-benzanthraquinone, 2-methyl-1,4-naphthoquinone, 2,3-dichloronaphthoquinone, 1,4-dimethylanthraquinone, 2,3-dimethylanthraquinone Quinone, 2-phenylanthraquinone, 2,3-dimethylanthraquinone, anthraquinone alphaose Comprising the sodium salt of acid, 3-chloro-2-methyl-anthraquinone, 7,8,9,10-tetrahydronaphthalene naphthacene quinone, a.

  It may also contain an α-hydrocarbon substituted aromatic acyloin, including benzoin, piperoin, acyloin ethers such as benzoin methyl and ethyl ether; α-methylbenzoin, α-allylbenzoin, and α-phenylbenzoin.

  Further suitable photoinitiators include 2- (0-chlorophenyl) -4,5-bis (m-methoxyphenyl) imidazole dimer; 1,1'-biimidazole, 2,2'-hist (0- Chlorophenyl) -4,4 ′, 5,5′-tetraphenyl: as well as 1H-imidazole, 2,5-bis (0-chlorophenyl) -4-3,4-dimethoxyphenyl dimer (each of which Typically used with hydrogen donors, such as 2-mercaptobenzoxazole).

  The photopolymer material further comprises a fluorine-containing polymer, an addition-polymerizable ethylenically unsaturated monomer, and a photoinitiator. When imaged (optical recording), the photopolymer material has a refractive index modulation greater than 0.001. The photopolymerizable composition can be used. This may further include a plasticizer.

  The fluorine-containing polymer can be a polymer made from a perfluorinated monomer and vinyl acetate, such as tetrafluoroethylene or hexafluoropropylene, and can also contain other monomers. For example, a material containing 10 to 20% fluorine is used.

  The fluorine-containing polymer used is a fluorine-containing polymer that is compatible with the other components of the photopolymer and produces a substantially solid transparent film when applied.

  Fluorine is introduced by copolymerizing other monomers constituting the fluorine-containing polymer with the fluorine-containing monomer, or by reaction with the fluorine-containing polymer, and the fluorine-containing polymer is an alcohol or an acid substituent. When a functional group is contained, a condensation, acetalization, ketalization, or esterification reaction is used to introduce fluorine.

  By including such a fluorine-containing polymer in the photopolymer material, the scratch-off suitability at the interface between the scratch concealment layer 4 and the volume hologram forming layer 3 is improved, and the exposed surface of the volume hologram forming layer 3 is “optical”. It is preferable because the “specular mirror surface” can be easily maintained.

  Fluorine-containing polymers include polymers of fluorinated monomers with vinyl esters, vinyl alcohol, vinyl ether, vinyl acetal / butyral, or prepolymers or mixtures thereof. For example, the fluorine-containing polymer can be a polymer of vinyl acetate and a fluorinated monomer, and if necessary, the acetate substituents of the polymer can be removed by hydrolysis to remove the fluorinated poly (vinyl alcohol) derivative. It can also be obtained. This fluorinated poly (vinyl alcohol) can be made into, for example, a fluorinated poly (vinyl butyral) derivative by condensation with butyraldehyde.

  Fluorinated poly (vinyl formal), poly (vinyl acetal), etc., or mixtures thereof can be made in the same manner. The fluorinated monomer is preferably a perfluorinated monomer, such as tetrafluoroethylene and / or hexafluoropropylene, but other monomers such as vinyl fluoride or vinylidene fluoride may also be used for specific applications. Can be selected for.

  Other monomers can also be present if desired. For example, ethyl vinyl ether can be mixed in the monomer mixture in order to adjust chemical or physical properties such as photopolymer solubility, adhesion, flexibility, or hardness. Such photopolymers are produced using conventional free radical polymerization methods.

  Fluorinated fluorine-containing polymers can also be made by reacting appropriately substituted polymers with fluorinated compounds. Polymers with potential reactive sites, such as hydroxyl or carboxyl groups, can be converted to fluorinated fluorine-containing polymers by reaction with fluorinated compounds. For example, fluorinated poly (vinyl butyral) can be prepared by condensation of 2,2,3,3,4,4,4-heptafluorobutyraldehyde and poly (vinyl alcohol). Polymers containing carboxylic acids can be esterified with fluorinated alcohols; poly (vinyl alcohol), partially saponified poly (vinyl acetate), or polymers of fluorinated monomers and vinyl acetate Hydroxyl group-containing polymers, such as partially saponified or saponified, can be esterified with fluorinated carboxylic acids.

  Fluoroolefins can be grafted onto appropriately substituted polymers using standard grafting techniques. Polymers with vinyl esters, at least one fluorinated monomer, and any other monomer to adjust the physical properties of the resulting polymer are preferred.

  In general, as the fluorine content decreases, the effect also decreases, so that the fluorine-containing polymer contains at least 10% fluorine. However, if the fluorine content is too high, the resulting photopolymer tends to be opaque and is not useful for the preparation of a volume hologram forming layer. Furthermore, when used as a window film, the adhesiveness with the adhesive for re-adhesion is significantly reduced. Accordingly, preferred fluorine-containing polymers have a fluorine content of 10-20%.

  Vinyl acetate is particularly preferred as the vinyl ester component of the fluorine-containing polymer, but other vinyl esters and structurally related compounds that give similar results may be selected in addition to or instead of vinyl acetate. it can. For example, vinyl pivalate, vinyl propionate, vinyl stearate, vinyl alcohol, or n-butyl vinyl ether can be selected. Perfluorinated monomers such as tetrafluoroethylene or hexafluoropropylene have been found to be particularly useful as fluorinated monomer components, but include vinyl fluoride, vinylidene fluoride, fluoroolefins, fluoroalkyls. Other compounds such as acrylates and methacrylates can also be selected for specific applications.

  Choosing a fluorine-containing polymer that is fluorinated over its non-fluorinated counterpart dramatically increases the refractive index modulation, thus increasing the diffraction efficiency of the hologram.

  For example, with all other ingredients the same, what is achieved with polyvinyl acetate is a value in the range of about 0.025-0, 031, whereas the vinyl acetate / perfluoride monomer photopolymer In use, high index modulation values of over 0.040 and 0.076 are achieved.

  The fluorinated fluorine-containing polymer can be selected for only a portion of the total fluorine-containing polymer. In this case, the non-fluorinated counterpart of the fluorine-containing polymer is such that the two fluorine-containing polymers are compatible with each other and with the coating solvent and other photopolymer components, and the transparency, mechanical properties of the photopolymer. Other properties can be selected if they are not unduly sacrificed in nature.

  The photopolymer contains at least one ethylenically unsaturated monomer that is free-radical initiated, has a boiling point of 100 ° C. or higher, and is compatible with the coating solvent and the selected fluorine-containing polymer. To get. This monomer usually contains an unsaturated group at the terminal position. Generally, liquid monomers are selected, but solid monomers can also be used in combination with one or several liquid monomers if the solid monomers can be internally diffused in the substantially solid photopolymer composition. it can.

  Monomers are liquid, ethylenically unsaturated compounds that are capable of addition polymerization and have a boiling point of 100 ° C. or higher, which are substituted or unsubstituted, including up to three aromatic rings; chlorine; and bromine. It contains one or several moieties selected from the group consisting of phenyl, biphenyl, phenoxy, naphthyl, naphthyloxy, and heteroaromatic groups. The monomer contains at least one such moiety, and can contain two or more such moieties that are the same or different if the monomer remains liquid. Substituents such as lower alkyl, alkyloxy, hydroxy, phenyl, phenoxy, carboxy, carbonylimide, cyano, chloro, bromo or combinations thereof, if the monomer remains a liquid monomer and can diffuse in the photopolymerizable layer. Can exist.

  Typical liquid monomers include 2-phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, phenol ethoxylate monoacrylate, 2- (p-chlorophenoxy) ethyl acrylate, p-chlorophenyl acrylate, phenyl acrylate, 2-phenylethyl Acryl-1-, 2- (1-butyloxy) ethyl acrylate, 0-biphenyl methacrylate, 0-phenyl acrylate, and mixtures thereof are included.

  The monomers are usually liquid, but can also be used in admixture with one or several ethylenically unsaturated solid monomers, such as ethylenically unsaturated carbazole monomers.

  Ethylenically unsaturated carbazole monomers containing vinyl groups attached to the nitrogen atom of the carbazole moiety are typically solid. Suitable monomers of this type include N-vinyl carbazole and 3,6-dipromo 9-vinyl carbazole. Particularly preferred mixtures of ethylenically unsaturated monomers are one or several of N-vinylcarbazole and liquid monomers, in particular 2-phenoxyethyl acrylate, phenol ethoxylate monoacrylate, ethoxylate bisphenol-A diacrylate, or mixtures thereof. It consists of a combination with.

  When the photopolymer is cross-linked (photopolymerized), up to 5% of at least one multifunctional monomer containing two or several terminal ethylenically unsaturated groups in the composition can be added. The polyfunctional monomer must be compatible with the other components of the composition and is preferably a liquid. Polyfunctional monomers include bisphenol-A di (2-acryloxyethyl) ether, ethoxylate bisphenol-A diacrylate, triethylene glycol diacrylate, trimethylolpropane triacrylate, and others. Ethoxylate bisphenol-A diacrylate is particularly preferred.

  The photoinitiator system consists of one or several compounds that directly give free radicals when activated by ionizing radiation. “Ionizing radiation” means active radiation that generates free radicals necessary to initiate the polymerization of the monomer material.

  The system can also be composed of a plurality of compounds, one of which produces free radicals after another compound or sensitizer is activated by radiation.

  Useful initiator systems may contain various sensitizers and can utilize a number of free radical generating compounds. In particular, a redox system containing a pigment such as rose bengal / 2-dibutylaminoethanol can also be used. Photoreducing dyes and reducing agents, ogisazine, and quinone dyes, dye-oxalate complexes, dye-sensitized azinium salts, and trichloromethyltriazines can be used to initiate photopolymerization. it can.

  A preferred photoinitiator system is 2,4,5-triphenylimidazolyl dimer, sensitized with a visible light sensitizer, with a chain transfer agent or a hydrogen donor, and mixtures thereof. This includes 2- (0-chlorophenyl) -4,5-bis (m-methoxyphenyl) -imidazole dimer; 1,1′-biimidazole, 2,2′-bis (0-chlorophenyl ′)-4, 4'5,5'-tetraphenyl; and IH-imidazole, 2,5-bis (0-chlorophenyl) -4- (3,4-dimethoxyphenyl] -timer, etc., each of which is typically a hydrogen donor Used with.

  Sensitizers include bis (p-dialkylaminobenzilidine) ketones and arylitin aryl ketones.

  Suitable hydrogen donors include 2-mercaptobenzoxazole, 2-mercaptobenzothiazole, 4-methyl-4H-1,2,4-1-riazol-3-thiol, and others.

  Other hydrogen donors preferred for compositions containing N-vinylcarbazole monomers are 5-chloro-2-mercaptobenzothiazole; 2-mercaptobenzothiazole, IH-1,2,4-methyl-4H— 1,2,4-triazole-3-thiol, 1-dodecanethiol, and mixtures thereof.

  As other components, each of the other components commonly added to photopolymer compositions is intended to alter the physical properties of the photopolymer. Such components include plasticizers, heat stabilizers, optical brighteners, UV stabilizers, adhesion modifiers, coating aids, release agents and the like.

  Plasticizers are present to alter the photopolymer's adhesion, flexibility, hardness, and other physical properties. Plasticizers include triethylene glycol, triethylene glycol diacetate, triethylene glycol dipropionate, triethylene glycol dicaprylate, triethylene glycol dimethyl ether, poly (ethylene glycol), poly (ethylene glycol) methyl ether, triethylene Glycol bis (2-ethylhexanoate), tetraethylene glycol diheptanoate, diethyl sebacate, dibutyl suberate, tris (2-ethylhexyl) phosphate, isozolovir naphthalene, diisopropyl naphthalene, poly (propylene glycol), tri Includes glyceryl butyrate, diethyl adipate, diethyl sebacate, nopyl perphosphate, tributyl phosphate, tris (2-ethylhexyl) phosphate, etc.

  Useful heat stabilizers include hydroquinone, phenidone, p-methoxyphenol, alkyl and aryl substituted hydroquinones and quinones, t-butylcatechol, pyrogallol, beta naphthol, cuprous chloride, 2,6-di-t-butyl. -P-cresol, phenothiazine, copper resinate, naphthylamine, pyridine, nitrobenzene, dinitrobenzene, floranil, chloranneal and the like. Dinitroso dimers are also useful.

  As a coating aid, a nonionic surfactant can be added to the photopolymerizable composition. Preferred coating aids are fluorinated nonionic active agents.

  A useful optical brightener is 7- (4'-chloro-6'-diethylamino-1 ', 3', 5'-triazine-4'yl) amino 3-phenylcoumarin. Furthermore, an ultraviolet absorbing material can be used as appropriate.

  Further, the transparent resin, that is, the photopolymerizable composition comprises a cationic polymerizable compound, a radical polymerizable compound, a photo radical polymerization initiator system, and a photo cationic polymerization initiator system for polymerizing the cationic polymerizable compound. A photosensitive material is used.

  As the cationically polymerizable compound, those which are liquid at room temperature are used so that the polymerization of the radically polymerizable compound is carried out in a composition having a relatively low viscosity throughout. Examples of such cationic polymerizable compounds include diglycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, 1,4-bis (2,3-epoxypropoxyperfluoroisopropyl) cyclohexane, sorbitol polyglycidyl ether, trimethylolpropane polyglycidyl ether. Resorcin diglycidyl ether, 1,6-hexanediol diglycidyl ether, polyethylene glycol diglycidyl ether, phenyl glycidyl ether and the like are used.

  The radically polymerizable compound preferably has at least one ethylenically unsaturated double bond in the molecule. Further, the average refractive index of the radical polymerizable compound is larger than that of the cationic polymerizable compound, preferably 0.02 or more, and if it is smaller, the refractive index modulation becomes insufficient, which is not preferable. Examples of the radical polymerizable compound include acrylamide, methacrylamide, styrene, 2-bromostyrene, phenyl acrylate, 2-phenoxyethyl acrylate, 2,3-naphthalenedicarboxylic acid (acryloxyethyl) monoester, methylphenoxyethyl acrylate, and nonyl. Phenoxyethyl acrylate, β-acryloxyethyl hydrogen phthalate, or the like is used.

  The radical photopolymerization initiator system may be an initiator system that generates active radicals by the first exposure for producing volume holograms, and the active radicals polymerize radical polymerizable compounds, and generally absorbs light. A sensitizer as a component is used in combination with an active radical generating compound or an acid generating compound.

  As the sensitizer in the radical photopolymerization initiator system, a colored compound such as a dye is often used to absorb visible laser light, but a cyanine dye is preferable in the case of a colorless and transparent volume hologram. Since cyanine dyes are generally easily decomposed by light, the dyes in the volume hologram are decomposed by leaving them for several hours to several days under post-exposure or indoor light or sunlight. A colorless and transparent volume hologram is obtained.

  Specific examples of the cyanine dye include anhydro-3,3′-dicarboxymethyl-9-ethyl-2,2′thiacarbocyanine betaine, anhydro-3-carboxymethyl-3 ′, 9-diethyl-2,2 'Thiacarbocyanine betaine, 3,3', 9-triethyl-2,2'-thiacarbocyanine iodine salt, 3,9-diethyl-3'-carboxymethyl-2,2'-thiacarbocyanine iodine salt Etc. are exemplified.

  Examples of the active radical generating compound that may be used in combination with a cyanine dye include diaryliodonium compounds and 2,4,6-substituted-1,3,5-triazines. When high photosensitivity is required, the use of diaryliodonium compounds is particularly preferred. Examples of the diaryliodonium include diphenyliodonium, 4,4′-dichlorodiphenyliodonium, 4,4′-dimethoxydiphenyliodonium, and the like. Examples of 2,4,6-substituted-1,3,5-triazines include 2-methyl-4,6-bis (trichloromethyl) -1,3,5-triazine, 2,4,6-tris. (Trichloromethyl) -1,3,5-triazine and the like are exemplified.

  The cationic photopolymerization initiator system has low photosensitivity for the first exposure, irradiates light having a wavelength different from that of the first exposure, and then generates Bronsted acid or Lewis acid upon exposure to light. An initiator system for polymerizing the polymerizable compound may be used, and those that do not polymerize the cationic polymerizable compound during the first exposure are particularly preferable. Examples of the cationic photopolymerization initiator system include diaryliodonium salts, triarylsulfonium salts, iron allene complexes, and the like. Preferred examples of the diaryl iodonium salts include tetrafluoroborate salts, hexafluorophosphate salts, hexafluoroarsenate salts and hexafluoroantimonate salts of iodonium compounds shown in the photoradical polymerization initiator system. Preferable triarylsulfonium salts include triphenylsulfonium, 4-tertiarybutyltriphenylsulfonium, and the like.

  In the photopolymerizable composition, a binder resin, a thermal polymerization inhibitor, a silane coupling agent, a plasticizer, a colorant and the like may be used in combination as necessary. The binder resin is stable for improving the film formability and film thickness uniformity of the composition prior to volume hologram formation, and for interference fringes formed by polymerization by irradiation with light such as laser light until post-exposure. Used to be present. The binder resin only needs to be compatible with the cationic polymerizable compound or the radical polymerizable composition, and specific examples thereof include chlorinated polyethylene, polymethyl methacrylate, methyl methacrylate, and other (meth) acrylic acid alkyl esters. And a copolymer of vinyl chloride and acrylonitrile, polyvinyl acetate, and the like. The binder resin may have reactivity such as a cation polymerizable group in its side chain or main chain.

  The volume hologram forming layer 3 has a thickness of 5.0 μm to 500 μm. Preferably, the thickness is 30 μm to 100 μm.

  When the volume hologram forming layer 3 is provided on the card substrate 1 by coating a transparent resin, the volume hologram forming layer 3 is obtained by applying a coating solution of a photopolymerizable composition to a bar coat, spin coat, or It is applied and formed by dipping or the like, or gravure coating, roll coating, die coating, or comma coating. The volume hologram forming layer 3 is solidified using drying or curing means.

  The photopolymerizable composition includes 10 to 50% of the cationic polymerizable compound, 40 to 70% of the radical polymerizable compound, 1 to 5% of the photo radical polymerization initiator system, and light. The cationic polymerization initiator system is 1 to 5%, and the total amount is 100%.

  The photopolymerizable composition is blended with a ketone solvent, an ester solvent, an aromatic solvent, a cellsolve solvent, an alcohol solvent, an ether solvent, a halogen solvent, etc., if necessary, at high speed in a cool and dark place. Prepare by mixing with a stirrer.

  The volume hologram forming layer 3 can also be provided on the card substrate 1 by using the above-described resin material and using a casting method, a die coating method, or the like.

  Furthermore, in order to make the “cross section” of the volume hologram forming layer 3 a smooth surface or “optical mirror surface”, a photoresist method, intaglio printing (in particular, the inner surface of “intaglio”, in particular, The surface of the recess is smoothed.) It is also preferable to employ processing means.

The volume hologram forming layer 3 is recorded with a transmission hologram or a reflection hologram, which is a volume hologram, using an appropriate optical system. Or, both of them are multiplexed. (Not shown)
The method will be described below.

  First, an “object” to be imaged as a hologram image is prepared.

  The “object” can be a real three-dimensional object such as a sculpture or a model (if it is a famous author, its design is very high), or a painting or brand design 2 A dimensional object is used. Alternatively, “light” that can provide “object light” and is projected onto the surface of the recording medium by an optical system using an optical element capable of electronic cell conversion, such as a spatial modulator. Image ".

  Of course, a “hologram reproduction image” (a three-dimensional light image) from a “hologram” created in advance can also be used.

  This “object” is illuminated with a coherent light such as a gas laser, a solid state laser, a semiconductor laser, and various dye lasers with a predetermined wavelength selected, and a “predetermined optical system” as described above is prepared (see FIG. (Not shown), a transmission hologram is recorded.

  Alternatively, a similar “predetermined optical system” is prepared in a suitable hologram recording photoresist, and a master hologram is recorded and developed.

  Next, the master hologram is recorded as a “reflection hologram” on the volume hologram forming layer 3 by using the light hologram used above again by using a predetermined optical system.

When the same illumination as the reference light used in the above optical system is applied to the transmission hologram (this is “illumination light”), through the volume hologram forming layer 3 by observation from the direction in which the illumination light is transmitted. The image of the “object”, that is, the transmission hologram reproduction image can be visually recognized at a predetermined position. (Not shown)
In the case of a reflection type hologram, an image of an “object” reproduced only at a predetermined wavelength, that is, a reflection type hologram reproduction image can be visually recognized due to the wavelength selectivity without using reference light. The “reproduction angle” in this case is the same.

  When using the above method, two “objects” are prepared, and two light sources (a first wavelength and two laser light sources having a second wavelength) are used to form angles respectively for the volume hologram formation. Two volume holograms can be multiplexed and recorded by changing the recording.

  Of course, it is also possible to record the above-mentioned transmission hologram and reflection hologram on the same volume hologram forming layer 3 and “multiplex-record the transmission hologram and the reflection hologram”.

  The volume hologram forming layer 3 used at this time includes, for example, two kinds of sensitizers so as to have sensitivity to two light sources.

  In addition to the volume hologram forming layer 3 as a single layer, not only multiple recording is performed on one layer, but the volume hologram forming layer 3 is formed as a multilayer, and each photopolymer is used for each layer. Recording is also preferable in order to increase the sharpness of each hologram reproduction image.

When two volume holograms are multiplexed and recorded, each “object” image can be seen in two viewing directions. (Not shown)
As holograms, laser reproduction holograms, white light reproduction holograms, color holograms utilizing these principles, computer generated holograms (CGH), holographic stereograms, holographic diffraction gratings, and holograms composed of composite diffraction gratings Etc. can be recorded as appropriate. Further, as in a machine readable hologram, the reproduction light is converted into data by the light receiving unit, and transmitted as “secret information” 2 or partial configuration information of “secret information” 2, or authenticity determination is performed. It may be a thing. (Not shown)
The volume hologram is formed on the “volume hologram forming layer 3 (single layer) recorded as described above” “a laminate of the card substrate 1 on which the volume hologram has not yet been recorded and the volume hologram forming layer 3”. On the surface of the volume hologram forming layer 3, the “recorded volume hologram forming layer 3, which is a single layer” is adhered and overlapped (an index matching liquid or the like may be inserted therebetween). A large number of copies can be made by irradiating an appropriate laser beam from the “recorded volume hologram forming layer 3” side. (Not shown)
On the volume hologram forming layer 3 and / or the scratch concealment layer 4 and further on the black layer, the print design or hologram design according to the application of the scratch cards H1 and 6 of the present invention is used. The tint block printing 5 is performed with a thickness of 1.0 to 10.0 μm using offset printing or gravure printing. (Refer to FIG. 4. A geometrical pattern print 5 is applied on the volume hologram forming layer 3.)
On the volume hologram forming layer 3 and / or the scratch concealment layer 4 and further on the black layer, a normal design (main design pattern, etc.) other than the tint block printing 5 is printed, and its design properties Needless to say, it can be improved.

Furthermore, on the scratch concealment layer 4 or on the scratch concealment layer 4 and the tint block printing 5, a cellulose resin, a polyester resin, a vinyl resin, an epoxy resin, an acrylic resin, and a copolymer thereof. May further enhance the concealment of the “secret information” 2 by forming a protective layer of ionizing radiation curable resin or the like to a thickness of 1 to 3 μm by a thermal melting transfer method, a sublimation transfer method, or an ink jet method. (Not shown)
However, if a part of the surface of the volume hologram forming layer 3 or the scratch concealing layer 4 is a portion where a “rough rough surface” is intentionally provided as described above, printing is performed following these large irregularities. The copy-forgery-inhibited pattern printing 5 may be performed using a possible inkjet method, a thermal transfer method that is not easily affected by the unevenness, or a sublimation transfer method. Further, by using such a thermal transfer method or a sublimation transfer method, printing is performed only on the convex portions of the large unevenness so that the copy-forgery-inhibited pattern printing 5 can be destroyed very easily by unauthorized scratches. it can.

  In particular, the sublimation transfer method can penetrate into the resin layer constituting the volume hologram forming layer 3 and create a unique texture.

The position for forming the tint block print 5 may be provided uniformly on the entire surface of the volume hologram forming layer 3 or the scratch concealment layer 4 (see FIG. 4. In FIG. 4, the tint block print 5 is formed on the scratch concealment layer 4. An example in which the entire surface is formed is shown.), May be provided partially, or may be provided in a plurality of regions. (Not shown)
And this tint block printing 5 is provided on both the scratch concealment layer 4 and between the scratch concealment layer 4 and the volume hologram formation layer 3, and the design and formation position thereof are above and below the scratch concealment layer 4. It is also preferable to make the positions different or the same in order to enhance the unexpectedness and the anti-counterfeiting property. (Not shown)
(Black layer)
In the scratch cards H1 and 6 of the present invention, on the back surface of the volume hologram forming layer 3, that is, between the card substrate 1 and the volume hologram forming layer 3 (on the “secret information” 2 forming portion formed thereon) A black layer can be provided at a predetermined position of (Not shown)
Here, a plurality of black layers may be formed partially and discretely. And it is good also as what represents a certain design with the pattern of this black layer. (Not shown)
The black layer contains fine particle carbon black, ultrafine carbon black, fine particles and ultrafine particles of other carbon black pigments and oxide black pigments, and metal-containing black dye (metal complex dye). 20 to 70% by mass, transparent resin, for example, acrylic resin, acrylamide resin, nitrocellulose resin, polystyrene resin, etc. as thermoplastic resin, and unsaturated polyester resin, acrylic resin as thermosetting resin Kneading by ball mill, kneader, roll mill using glass beads or steel beads to reduce secondary aggregation in urethane resin, epoxy modified acrylic resin, epoxy modified unsaturated polyester resin, alkyd resin, phenol resin, etc. Gradually adjust the viscosity with a solvent, etc. Wherein the offset method, silk screen method, a curtain coating method, a nozzle coating method, ink jet method can further be formed to a uniform thickness using a flexographic printing method appropriately. (Not shown)
In this case, a material having high adhesion to the volume hologram forming layer 3 or the card substrate 1 is selected.

  Of course, as the black layer, it is also preferable to use a plastic film containing the same proportions of the above pigments and dyes.

  In this case, the surface of the film can be finished in advance as an “optical mirror surface”, the refractive index can be easily adjusted, and the thickness unevenness can be controlled with high accuracy. It becomes possible.

The thickness of the black layer is 2.5 μm to 25 μm, preferably 5.0 μm to 20 μm.
(Adhesive layer)
In the scratch cards H1 and 6 of the present invention, between the card substrate 1 (to be provided so as to cover the “secret information” 2 forming portion formed thereon) and the volume hologram forming layer 3, An adhesive layer can be provided between the card substrate 1 and the black layer described above, and although partially, between the card substrate 1 and the scratch concealment layer 4. (Not shown)
Here, as the adhesive layer, any of conventionally known solvent-based and water-based adhesives, for example, vinyl acetate resin, acrylic resin, vinyl acetate-acrylic copolymer, vinyl acetate-vinyl chloride copolymer, ethylene-acetic acid. Examples include vinyl copolymers, polyurethane resins, and rubber resins such as natural rubber and chloroprene rubber. Natural latex such as natural rubber latex, natural rubber latex obtained by graft polymerization of natural rubber with styrene, especially methacrylic acid methyl, in particular, to make natural material composition You may use what was produced from the raw material. (reference.)
Solvents used in the adhesive layer include solvents such as ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, diacetone alcohol, isophorone, diisobutyl ketone, etc.), alcohols (methanol, ethanol, isopropyl alcohol, n-propyl alcohol, isobutyl alcohol, n-butyl alcohol, etc., and aqueous solutions thereof), aromatics (benzene, toluene, xylene, Solvesso No. 100, Solvesso No. 150, Cactus P-180, etc.), cyclic Hydrocarbons (cyclohexane, etc.), esters (ethyl acetate, butyl acetate, isobutyl acetate, propylene glycol monomethyl ether acetate, cellosolve acetate, ethyl-3-ethoxypropionate, etc.), ether (Tetrahydrofuran, methyl cellosolve, ethyl cellosolve, butyl cellosolve, t- butyl cellosolve.) And the like can be used.

  The formation thickness of the adhesive layer is 1.0 μm to 30 μm.

The adhesive layer can be formed by applying and drying on the card substrate 1 and the “secret information” 2 by a method such as gravure coating, roll coating or comma coating. When more precise printing is required, a stainless screen printing method, a letterpress printing method, an offset printing method, a photoresist processing method, or the like can be used. (Not shown)
Alternatively, before the volume hologram forming layer 3 and the scratch concealing layer 4 are formed on the card substrate 1, an adhesive layer is provided on the card substrate 1 side of the volume hologram forming layer 3, and together with the scratch concealing layer 4, A procedure for adhering to the card substrate 1 can be adopted.

  Alternatively, the entire volume hologram forming layer 3 and the scratch concealing layer including the exposed surface of the scratch concealing layer 4 provided slightly larger than the volume hologram forming layer 3 (a black layer may be provided thereon). 4, an adhesive layer is provided, and the volume hologram forming layer 3 and the scratch concealing layer 4 are provided on the card substrate 1, and the scratch concealing layer 4 covers the cross section of the volume hologram forming layer 3. .

  In any of the procedures, the same formation method can be used to obtain the same thickness.

  The adhesive strength of the adhesive layer is the peel strength at the interface between the card substrate 1 and the “secret information” 2 and the adhesive layer, and further the peel strength at the interface between at least the volume hologram forming layer 3 and the adhesive layer. In the peeling method at 180 ° according to JIS Z0237, it is desirable that the width is in the range of 1.0 to 3.0 kg / 25 mm. Of course, even higher peel strengths are suitable for the purposes of the present invention.

  In particular, the adhesive strength between the card base 1 and the “secret information” 2 forming portion on the card base 1 is determined from the object of the present invention, and the card base 1 and the card base of the scratch cards H1 and 6 of the present invention. The “secret information” 2 forming portion on the card base 1 and the card base 1 are required to be large enough to be difficult to peel off from the “secret information” 2 forming portion on the top 1. The peel strength at the interface between the adhesive layer and the volume hologram forming layer 3 is designed to be larger than the peel strength at the interface between the adhesive layer and the volume hologram forming layer 3.

  To the adhesive layer, a fine particle transparent pigment or an ultrafine particle pigment can be added for the purpose of adjusting its adhesive strength, its hardness (meaning fastness as a layer) and heat resistance.

  As the fine particle transparent pigment and ultrafine particle pigment, those obtained by finely pulverizing extender pigments such as calcium carbonate, barium sulfate, aluminum hydroxide, clay, kaolin, white carbon, alumina white, diatomaceous earth, gypsum, talc, and silica powder, Uses inorganic fine particles such as microsilica, fine particle resin powders such as silicon resin and fluororesin powder, and other fine particle pigments having an average particle size of 0.1 μm to 0.01 μm, and ultrafine pigments having a particle size of 0.01 μm or less To do.

  Specifically, the average particle size is adjusted for finely pulverized naturally occurring calcite, ice sheets, aragonite, limestone, marble, shells, chalk, barite, gypsum, gibbstone, etc., and their composites. In addition, as for inorganic pigments and organic pigments that are generally used, those having an average particle size of 0.01 μm or less, such as ultrafine titanium oxide and ultrafine zirconium oxide, are appropriately resinous. It is suitable because it becomes transparent when mixed with the material.

  As a specific example, when ultrafine titanium oxide (Ishihara Sangyo Co., Ltd. TTO-55N: refractive index n = 2.4) is dispersed in an appropriate resin, the refractive index is 1.9 to 2.0. In addition, when ultrafine zirconium oxide (average particle diameter 0.0001 μm to 0.05 μm in dynamic light scattering method) is dispersed in an appropriate resin, the refractive index as “layer” is 1.7 to 1. .9.

  However, particles having this particle size are liable to agglomerate, and need to be subjected to redispersion treatment such as repeated passage through an appropriate dispersion treatment machine such as a kneader. The addition amount is determined by the balance between the degree of improvement of the refractive index and transparency, but usually 1% to 20% addition is preferable.

  The formation method and thickness are the above-described method and thickness.

  Thus, if the adhesive layer also has a high refractive index, the reflectance at the interface where the adhesive layer and the volume hologram forming layer 3 are in direct contact can be increased, and the volume hologram located on this interface can be increased. A volume hologram reproduction image reproduced from the formation layer 3 can be made clearer, which is preferable.

When the scratch cards H1 and 6 of the present invention formed as described above were observed under ordinary illumination light, it was determined that they were “scratch cards”, but they were hidden under the scratch layer. The “secret information” 2 estimated to be present cannot be visually recognized at all. Of course, the existence of the volume hologram forming layer 3 cannot be imagined. (See FIGS. 1-2)
At this time, consecutive numbers 1 to 8 are printed as “secret information” 2 at a predetermined position on the card base 1 (see FIG. 3. In FIG. 3, a frame indicating the predetermined position is for convenience. The volume hologram forming layer 3 and the scratch concealment layer 4 are provided so as to cover the “secret information” 2. (See FIGS. 1-2)
Further, a tint block print 5 made of a geometric pattern was applied on the scratch concealment layer 4 of the scratch card 6 of the present invention. (See Figure 4.)
In any case, the “secret information” 2 covered with the scratch concealment layer 4 and further the volume hologram forming layer 3 cannot be visually confirmed, and this layer is not broken by a nail or the like. It seemed impossible to remove it cleanly,
“Predetermined incident light” is incident on “one of the exposed cross-sections” of the volume hologram, and the other cross-section of the “exposed cross-section” on the opposite side of the “cross-section” When observing the emitted light emitted from “the first volume hologram reproduction image” by the volume hologram forming layer 3,
Then, when the scratch concealment layer 4 of the scratch cards H1 and 6 of the present invention, or the tint block printing 5 and the scratch concealment layer 4 are partially scraped off using coins, they are hidden under the scraped area. The “secret information” 2 can be visually recognized, and at the same time, the “second volume hologram reproduction image” by the volume hologram forming layer 3 can be observed, and it is extremely difficult to forge such scratch cards H1 and 6 Seemed difficult. (Not shown)

EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, it is not limited to this. In addition, except a solvent, each composition of each layer is a mass part of solid content conversion.
Example 1
As a card substrate 1 of the scratch card 6, a hard vinyl chloride sheet having a thickness of 560 μm is sandwiched between two soft vinyl chloride sheets having a thickness of 100 μm, and a three-layer laminated vinyl chloride sheet (credit card size) having a total thickness of 760 μm is used. Use.

Predetermined design printing was performed on the hard vinyl chloride sheet by offset printing, and then a three-layer laminate was formed under predetermined lamination conditions. (Refer to FIG. 1 and FIG. 2. The lamination state of the card base 1 is not shown.)
In a predetermined area of the card base material 1 (an area located almost in the center of the card base material 1), the number “12345678” (the height of each numeric character is 4 mm) as “secret information” 2 by an inkjet printer. , Width 2 mm, character spacing 1 mm). (See FIG. 1 and FIG. 3.)
Here, on a polyethylene terephthalate film having a thickness of 100 μm, a photopolymer having a film thickness of 100 μm (a layer that becomes a “volume hologram forming layer 3”) is laminated, and a polyethylene film having a thickness of 50 μm is formed as a protective film. Using a laminated photopolymer (a photopolymer layer of “HRF705” manufactured by DuPont was made to have a predetermined thickness), this laminated film was 30 mm long × 50 mm wide and the surface was smooth. Using a stainless steel cutting blade with a surface finish (those with a “blade shape”), the four “sections” were smooth surfaces (flat surfaces).

At this time, as the shape of the cross section of the volume hologram forming layer 3, two “cross sections” forming a rectangle of 100 μm in length × 30 mm in width (the remaining two sections have a shape of 100 μm in length × 50 mm in width). In order to make a distinction, it is assumed that the scratch card 6 is provided. In this state, the scratch card 6 is observed from above, and the right side “one of the exposed cross sections SEC1” and the scratch card are displayed. 6 was observed from above and was positioned as “the other cross section SEC2 of the exposed cross sections” on the left side. (See FIGS. 1 and 2)
Then, using a krypton laser (emission wavelength: 647 nm) as a light source and using a predetermined transmission hologram imaging optical system (not shown), characters of “true” and “positive” of 10 mm length × 10 mm width (character thickness) 1.0 mm. "Transparent original" (opening 5 mm wide) by spreading parallel light from the back of this "transparent original" and spreading it to "10 mm long x 25 mm wide" The “first volume hologram (cross-sectional volume hologram)” was recorded on the volume hologram forming layer 3 by the following procedure using “object 1” as a transmission volume hologram. (The situation to record is not shown.)
In other words, at an exposure intensity of 2.0 mW, “object light of object 1” having a size of “length 10 mm × width 25 mm” is “cylindrical having a size of length 15 mm × width 30 mm and a focal length of 500 mm. The spread of the “object light of the object 1” is compressed to a size of 0.1 mm in length × 30 mm in width through the lens (the compression in the vertical direction. This “object light of the object 1” is strengthened by this compression. The optical system was inserted into the optical path to reduce and adjust its strength.) In the “exposed cross section of the volume hologram forming layer 3” having a rectangular shape of 100 μm in length × 30 mm in width, The light is incident on the other cross section SEC2 substantially perpendicularly, proceeds in the same direction as the “object light of the object 1”, and “the other cross section SEC2 of the exposed cross sections” and “the cross section thereof”. Opposite “Parallel light” traveling perpendicularly to any one of the “exposed cross sections SEC1” is referred to as “reference light 1”, and “object light of object 1” and “reference light 1”. Was irradiated so as to have an exposure amount of 50 mJ / cm ² , and interfered in the “volume hologram forming layer 3” to record a “first volume hologram (cross-sectional volume hologram)”. (The situation to record is not shown.)
Thereafter, using a high-pressure mercury lamp, irradiation with ultraviolet rays of 500 mJ / cm ^{2 was performed} , followed by heat treatment at 120 ° C. for 120 minutes, and the protective film was peeled off. “Volume hologram forming layer 3 on which“ transparent document ”was recorded 3 , A sheet having a thickness of 200 μm and a size of 30 mm × 50 mm ”was produced. The diffraction efficiency at this time was 30% as the first volume hologram.

Next, the exposed surface of the volume hologram forming layer 3 of the sheet having a thickness of 100 μm is in contact with the surface on which the “secret information” 2 of the card substrate 1 is provided, and the “secret information” 2 formation portion is formed. Further, the sheet and the card substrate 1 are laminated so that the size of 30 mm × 50 mm is located at substantially the center of the card substrate 1, and the polyethylene terephthalate film having a thickness of 100 μm is peeled off to cover the card. A volume hologram forming layer 3 having a thickness of 100 μm and a size of 30 mm × 50 mm was transferred and formed on the substrate 1. (See FIG. 1 and FIG. 2.)
On the volume hologram forming layer 3, an ink composition for the scratch concealment layer 4 having the following composition is formed by a stainless screen printing method, and the scratch concealment layer 4 is formed to a thickness of 15 μm after drying. Thus, the scratch card H1 or 6 of Example 1 was obtained. (See FIGS. 1 and 2)
<Ink composition for scratch concealment layer 4>
Acrylonitrile-butadiene copolymer 20 parts Acrylic resin 5 parts Pigment non-leafing aluminum paste Aluminum fine powder 40 parts Pigment leafing aluminum paste Aluminum fine powder 10 parts Isocyanate-based curing agent 1 part Toluene 10 parts Ethyl acetate 5 parts Ethyl cell solve 9 parts This When the scratch card H1 or 6 of Example 1 was observed under a normal fluorescent lamp, it was only possible to observe “a silver print layer on a part of the card” on the scratch card H1 or 6. The existence of “secret information” 2 formed thereunder, and further the existence of the volume hologram forming layer 3 could not be known. (Refer to FIG. 1 and FIG. 2. “One of the exposed cross sections of the volume hologram forming layer 3 and the other cross section SEC1 and SEC2” can be visually recognized by careful observation. ”Could not recognize the existence of“ some volume hologram ”.)
Next, “one of the exposed cross sections, and the other cross section SEC1 and SEC2” of the “silver print layer” portion protruding from the surface of the card base 1 on the scratch card H1 or 6. (It is a cross section represented by a rectangle formed by “one side of a 30 mm vertical x 30 mm long vertical side” and “one side of a thickness of 100 μm”). When the “predetermined incident light”, which is the same parallel light as the “reference light 1” at the time of recording and whose “traveling direction is reverse”, is incident perpendicularly to one of the cross sections SEC1, From the other cross-section SEC2 ”, the“ first volume hologram reproduction image ”(object 1:“ transparent original ”composed of characters“ true ”and“ positive ”) by the“ first volume hologram ” Was regenerated and was visible. (The situation where the hologram reproduction image is reproduced is not shown.)
Next, the “silver print layer” portion on the scratch card H1 or 6 is scratched with coins (in the region where the “volume hologram forming layer 3 and the scratch concealment layer 4” are laminated, the scratch concealment layer 4 When the scratch concealment layer 4 is partially scraped, a part of the “secret information” 2 can be visually recognized from the scraped portion, and the scratch card H1 or 6 is forged. That seemed difficult. (Not shown)
(Example 2)
As the card substrate 1 of the scratch card 6, a three-layer laminated vinyl chloride sheet (credit card size) having a total thickness of 760 μm is used as in the first embodiment. (Refer to FIG. 1 and FIG. 2. The lamination state of the card base 1 is not shown.)
In a predetermined area of the card base material 1 (an area located almost in the center of the card base material 1), the number “12345678” (the height of each numeric character is 4 mm) as “secret information” 2 by an inkjet printer. , Width 2 mm, character spacing 1 mm). (See FIG. 1 and FIG. 3.)
Here, on a polyethylene terephthalate film having a thickness of 100 μm, a photopolymer having a film thickness of 100 μm (a layer that becomes a “volume hologram forming layer 3”) is laminated, and a polyethylene film having a thickness of 50 μm is formed as a protective film. Using a laminated photopolymer (formed by attaching “HRF705” manufactured by DuPont) and using a krypton laser (emission wavelength 647 nm) as a light source as a reflection hologram (“second volume hologram”) Using a reflection hologram imaging optical system (not shown), a “picture motif” (“object 2”) having a size of 30 mm × 50 mm is used as a reflection volume hologram, and its imaging position is 2 mm from the recording surface. Taken as a position.

At this time, at an exposure intensity of 2.0 mW, the recording angle (the angle of “reference light 2”. “Painting motif” which is “object 2” is symmetrical to the reference light 2 with respect to the normal direction of the sheet surface. The light reflected and diverged on this “painting motif” becomes “object light of the object 2”) with respect to the volume hologram forming layer 3 (with respect to the perpendicular direction of the sheet surface). Irradiation was performed at 20 degrees so that the exposure amount was 50 mJ / cm ² .

  The laminated film is carefully cut along the “painting motif” using a stainless steel cutting blade with a smooth surface finish, and the four “sections” are defined as smooth surfaces. did.

At this time, as the shape of the cross section of the volume hologram forming layer 3, two “cross sections” forming a rectangle of 100 μm in length × 30 mm in width (the remaining two sections have a shape of 100 μm in length × 50 mm in width). In order to make a distinction, it is assumed that the scratch card 6 is provided, and in that state, the scratch card 6 is observed from above, and the right side “one of the exposed cross sections SEC1” (“second cross section” “Picture motif”, which is “volume hologram”, means the right side when viewed from the front.) And the left side “the other cross-section SEC2 of the exposed cross-sections” when the scratch card 6 is observed from above. ("Picture motif", which is the "second volume hologram", when viewed from the front, means the left side of it). (See FIGS. 1 and 2)
Next, a “transparent original” (from the back of this “transparent original”) in which characters of “true” and “positive” (character thickness: 1.0 mm) 10 mm long × 10 mm wide are arranged with a space of 5 mm between them. By making parallel light and transmitting it, “object 1” having a spread of “10 mm in length × 25 mm in width” is designated as a transmission type volume hologram. One volume hologram (cross-sectional volume hologram) "was recorded over the above hologram recording. ("Second volume hologram" and "first volume hologram (cross-section volume hologram)" are recorded in a multiplexed manner. The situation of recording is not shown.)
That is, “object light of object 1” having a size of “10 mm long × 25 mm wide” is passed through “a cylindrical lens whose“ bottom ”shape is 15 mm long × 30 mm wide and has a focal length of 500 mm”. “Volume hologram forming layer 3” is formed by compressing the spread of “object light of object 2” to a size of 0.1 mm in length × 30 mm in width (it becomes compression in the vertical direction) and having a rectangular shape of 100 μm in length × 30 mm in width. ”Of the other exposed section, the other section SEC2 is made to enter substantially perpendicularly, proceed in the same direction as this“ object light of the object 2 ”, and within the“ exposed section, “Parallel light” traveling perpendicularly to any of the other cross section SEC2 ”and“ one cross section SEC1 of the exposed cross sections facing the cross section ”is referred to as“ reference light 1 ”. The “object light of object 1 And the “reference light 1” were interfered in the “volume hologram forming layer 3”, and the “first volume hologram (cross-section volume hologram)” was recorded. (The situation to record is not shown.)
After that, two “volume holograms” recorded in multiple recordings were irradiated with ultraviolet rays of 500 mJ / cm ² using a high-pressure mercury lamp, further heat-treated at 120 ° C. for 120 minutes, and the protective film was peeled off. A sheet having a thickness of 200 μm and a size of 30 mm × 50 mm in which a volume hologram forming layer 3 on which “painting motif” and “transmission original” are recorded in multiple layers was prepared. The diffraction efficiency at this time was 30% and 20% for the second volume hologram and the first volume hologram, respectively.

Next, the exposed surface of the volume hologram forming layer 3 of the 200 μm-thick sheet is in contact with the surface on which the “secret information” 2 of the card substrate 1 is provided, and the “secret information” 2 forming portion is formed. In addition, the sheet and the card substrate 1 are laminated so that a “painting motif” of 30 mm × 50 mm size is located at the approximate center of the card substrate 1, and a polyethylene terephthalate film having a thickness of 100 μm is laminated. After peeling, a volume hologram forming layer 3 having a thickness of 100 μm and a size of 30 mm × 50 mm was transferred and formed on the card substrate 1. (See FIG. 1 and FIG. 2.)
On the volume hologram forming layer 3, an ink composition for the scratch concealment layer 4 having the following composition is formed by a stainless screen printing method, and the scratch concealment layer 4 is formed to a thickness of 15 μm after drying. Thus, the scratch card H1 or 6 of Example 1 was obtained. (See FIGS. 1 and 2)
<Ink composition for scratch concealment layer 4>
Acrylonitrile-butadiene copolymer 20 parts Acrylic resin 5 parts Pigment non-leafing aluminum paste Aluminum fine powder 40 parts Pigment leafing aluminum paste Aluminum fine powder 10 parts Isocyanate-based curing agent 1 part Toluene 10 parts Ethyl acetate 5 parts Ethyl cell solve 9 parts This When the scratch card H1 or 6 of Example 1 was observed under a normal fluorescent lamp, it was only possible to observe “a silver print layer on a part of the card” on the scratch card H1 or 6. The existence of “secret information” 2 formed thereunder, and further the existence of the volume hologram forming layer 3 could not be known. (Refer to FIG. 1 and FIG. 2. “One of the exposed cross sections of the volume hologram forming layer 3 and the other cross section SEC1 and SEC2” can be visually recognized by careful observation. ”Could not recognize the existence of“ some volume hologram ”.)
Next, “one of the exposed cross sections, and the other cross section SEC1 and SEC2” of the “silver print layer” portion protruding from the surface of the card base 1 on the scratch card H1 or 6. (It is a cross section represented by a rectangle formed by one side of 30 mm length and 30 mm length and one side of a thickness of 100 μm.) One of the exposed cross sections When the “predetermined incident light” perpendicular to the “SEC1” and the “reference light 1” at the time of recording and having the “traveling direction is reverse” is incident, From the other cross-section SEC2, a “first volume hologram reproduction image” (object 1: “transmission original” composed of characters “true” and “positive”) is reproduced by the “first volume hologram”. I was able to see. (The situation where the hologram reproduction image is reproduced is not shown.)
Next, the “silver print layer” portion on the scratch card H1 or 6 is scratched with coins (in the region where the “volume hologram forming layer 3 and the scratch concealment layer 4” are laminated, the scratch concealment layer 4 When the scratch concealment layer 4 is partially scraped, a part of the “secret information” 2 can be visually recognized from the scraped portion. Part of the volume hologram reconstructed image "(object 2:" painting motif ") can be observed at the same time, and it seemed more difficult to forge such a scratch card H1 or 6. (Not shown)
(Example 3)
In Example 2, the scratch concealment layer 4 was once formed on an appropriate peelable film (surface-released polyethylene terephthalate film having a thickness of 38 μm), and the exposed surface and the peelable film were 3 mm thick. Sandwiched between two stainless steel plates (resin-coated on the surface and finished to an “optical mirror surface” with an average surface roughness Ra of 0.1 μm), and 200 ° C. from both sides A flat plate pressing process is performed at a pressure of 10 ⁹ Pa so that the exposed surface of the scratch concealment layer 4 is an “optical mirror surface”, and this exposed surface is referred to as “thickness on which the volume hologram forming layer 3 is laminated. “200 μm sheet” is laminated so as to be in contact with the surface of the volume hologram forming layer 3, the “appropriate release film” is peeled off, and the scratch concealment layer 4 is transferred onto the volume hologram forming layer 3. It was.

  At this time, the interface between the scratch masking layer 4 and the volume hologram forming layer 3 is an “optical mirror surface”.

Then, this “sheet in which the scratch concealment layer 4 is laminated on the“ sheet having a thickness of 200 μm on which the volume hologram forming layer 3 is laminated ”” is cut into a size of 30 mm × 50 mm as in the second embodiment. The volume hologram forming layer 3 is adjusted so as to be in a position covering the “secret information” 2 forming portion of the card substrate 1 and then further laminated to form a “laminate”. The volume of the “laminate” The polyethylene terephthalate film having a thickness of 100 μm in contact with the hologram forming layer 3 is peeled to expose the volume hologram forming layer 3, and the exposed surface is in contact with the surface on which the “secret information” 2 of the card substrate 1 is provided. In addition, a “painting motif” having a size of 30 mm × 50 mm is positioned substantially at the center of the card base 1 so as to cover the “secret information” 2 formation portion. In this way, this sheet and the card substrate 1 are laminated, and the card substrate 1 has a thickness of 115 μm (a laminate of the scratch concealment layer 4 having a thickness of 15 μm and the volume hologram forming layer 3 having a thickness of 100 μm). The “scratch concealing layer 4 and the volume hologram forming layer 3” having a size of 30 mm × 50 mm are transferred and formed, and the scratch card H1 or 6 of Example 3 is otherwise obtained in the same manner as in Example 2. Obtained. (See FIGS. 1 and 2. In FIG. 1, the state where the interface between the scratch concealing layer 4 and the volume hologram forming layer 3 is an “optical mirror surface” is not shown.)
When this scratch card H1 or 6 was evaluated in the same manner as in Example 2, the second volume hologram reproduction image “picture motif” by the volume hologram forming layer 3 can be observed more clearly (not shown). The same good results as in Example 2 were obtained except that it was more difficult to forge the sheet.

Example 4
On the surface opposite to the surface in contact with the volume hologram forming layer 3 of the scratch concealing layer 4 of Example 1 (the surface where the scratch concealing layer 4 is exposed), a yellow color comprising a geometric pattern by a sublimation transfer printer. The scratch card H1 or 6 of Example 4 was obtained in the same manner as Example 1 except that the background pattern printing 5 was performed. (See FIG. 1, FIG. 2 and FIG. 4. In FIG. 1 and FIG. 2, the tint block printing 5 is not shown. In FIG. 2, the layer covering “secret information” 2 is not “3 and 4”, but “ 3, 4 and 5 ".) At this time, the printing portion of the sublimation transfer printer, that is, the portion of the tint block printing 5 penetrates the scratch masking layer 4, and the outermost surface of the scratch masking layer 4 and the tint block printing 5 The surface of each forms the same surface.

When this scratch card H1 or 6 was evaluated in the same manner as in Example 1, it was found that the tint block print 5 had a unique texture and was observed in gold, and when scratched with coins, the tint block print 5 and the scratch concealment layer Good results similar to those of Example 1 were obtained except that 4 was scraped at the same time and the scratch card H1 or 6 was more difficult to forge. (Not shown)
(Example 5)
In Example 2, using a black layer ink composition having the following composition as a black layer, a screen printing method on the volume hologram forming layer 3 of “sheet having a thickness of 200 μm on which the volume hologram forming layer 3 is laminated” Was formed on the entire surface with a thickness of 10 μm after drying (however, when it was laminated on the card substrate 1, it was formed by excluding the region that was supposed to correspond to the position of the “secret information” 2 formation portion. ), “The sheet having a thickness of 210 μm on which the volume hologram forming layer 3 and the black layer are laminated”, and the black layer surface of the “sheet” is used as the “secret information” 2 forming portion of the card base 1. A scratch card H1 or 6 of Example 5 was obtained in the same manner as Example 2 except that the layers were laminated so as to be in contact with the surface to be included. (Refer to FIG. 1 and FIG. 2. In both cases, the black layer is not shown.)
<Ink composition for black layer>
Urethane resin 25 parts Carbon black 20 parts Toluene 15 parts Isopropyl alcohol 15 parts Butyl cellosolve 25 parts The scratch card H1 or 6 of Example 5 was evaluated in the same manner as in Example 2. The second volume hologram reproduction image “picture motif” can be observed very clearly, and the same good results as in Example 2 except that it was more difficult to forge this scratch card H1 or 6. Got. (Not shown)
(Example 6)
In Example 1, it was carried out in the same manner as in Example 1 except that the scratch concealing layer 4 was formed in the same manner and with the same thickness using the ink composition for the scratch concealing layer 4 having the following composition. The scratch card H1 or 6 of Example 6 was obtained. (See FIGS. 1 and 2)
<Ink composition for scratch concealment layer 4>
Acrylonitrile-butadiene copolymer 20 parts Acrylic resin 5 parts Pigment aluminum paste Aluminum fine powder (average particle size 8 μm) 30 parts Fine zirconium oxide (average particle size: 0.01 μm) 20 parts Silicone oil 5 parts Toluene 10 parts Ethyl acetate 5 Part Ethyl Cellosolve 5 parts The scratch card H1 or 6 was evaluated in the same manner as in Example 1, and the scratch masking layer 4 was tried to peel off the "entire layer". When bent, in addition to the same good results as in Example 1, wrinkles in the form of “peeling marks” were generated in the portions of the scratch concealment layer 4 where the scratches were not scratched, and the wrinkles flattened the card substrate 1 again. Even if it returns to a proper state, it does not disappear (on the contrary, a part of the wrinkle is generated up to a tear) and it has been fixed. Et al., Except that the forgery of the scratch card H1 or 6, appeared to be very difficult to obtain good results same as in Example 1. (Not shown)
(Comparative example)
In Example 1, a scratch card of a comparative example was obtained in the same manner as in Example 1 except that the scratch hologram was formed without providing the volume hologram forming layer 3.

  When this scratch card was evaluated in the same manner as in Example 1, the “secret information” 2 could be visually recognized by scratch-off, but the hologram (reproduced image) did not appear, and the scratch card was forged or altered. Estimated as easy.

H1, 6 Scratch card 1 Card base 2 “Confidential information”
3 Volume hologram forming layer SEC1 One of the exposed cross sections SEC2 The other cross section of the exposed cross sections 4 Scratch concealment layer 5 Background pattern printing

Claims (5)

A scratch card that conceals confidential information provided on one surface of a card substrate,
A volume hologram forming layer and a scratch concealment layer are provided in this order so as to cover the secret information on at least a part of the surface,
A first volume hologram reproduction image based on the predetermined incident light is reproduced by predetermined incident light incident on one of the exposed cross sections of the volume hologram forming layer, and the volume hologram formation is performed. Of the exposed cross section of the layer, from the emitted light emitted from the other cross section, the first volume hologram reproduction image can be visually recognized,
And the said secret information becomes visible by removing the said scratch concealment layer by scratch, The scratch card characterized by the above-mentioned. The scratch card according to claim 1,
By removing the scratch concealing layer by scratching, the secret information and the second volume hologram reproduction image reproduced by the volume hologram forming layer can be visually recognized. The scratch card according to claim 1 or 2,
A scratch card, wherein an interface between the scratch concealing layer and the volume hologram forming layer is an “optical mirror surface”.   The scratch card according to any one of claims 1 to 3, wherein a copy-forgery-inhibited pattern printing is performed on a surface of the scratch concealing layer opposite to a surface on which the volume hologram forming layer is formed. Scratch card.   5. The scratch card according to claim 1, wherein the scratch masking layer contains a pigment having an average particle diameter of 1.0 μm to 10 μm and a fine pigment having an average particle diameter of 0.01 μm to 0.1 μm. A scratch card characterized by that.

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