JPS61176969A - Card with hologram - Google Patents

Abstract

PURPOSE:To obtain a fogery preventing effect for a card, by using a recording body having the 1st information which is recorded and reproduced about the amplitude and phase of an optical wave by means of holography and the 2nd information which is recorded and reproduced about the amplitude and/or wavelength of an optical wave only. CONSTITUTION:A card 1 having hologram, onto which a transfer type hologram is transferred, is composed of a recording body 2 and card base material 3 and the recording body 2 is stuck to the surface of the base body 3. The recording body consists of a protective layer 4, hologram layer 5, reflective metallic thin film 6, and heat sealing layer from the outside and glued to the surface of the base material 3 through the layer 7. The 1st information which is recorded and reproduced about the amplitude and phase of an optical wave by means of holography is recorded on the layer 5 and the 2nd information which is recorded and reproduced about the amplitude and/or wavelength of an wave length only is recorded on the layer 6. Therefore, a three-dimensional ornamental effect and fogery preventing effect by the hologram can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a card with a hologram, and more specifically, the present invention relates to a card with a hologram.
recorded by holography and alien principles,
Concerning cards with anti-counterfeiting effect.

(Prior art and its problems) Holography utilizes the coherence of light and other waves,
This is an optical technology that records the interference fringes of signal waves emitted from an object on a photosensitive material and reproduces the signal waves by applying another light wave to the resulting hologram.

In this holography, since the light waves themselves from the object are reproduced, it is possible to reproduce a three-dimensional image, and since the hologram is a recording of interference fringes, it is also possible to perform multiple recording on a single hologram using holography. Therefore, the applications of holograms are wide-ranging, including 3D image displays, measurements such as interferometry, optical system applications such as photographic microscopes, high-density memory applications, and medical applications such as measuring biological surfaces. .

For example, one recording method using holography includes recording interference fringes corresponding to the wavefront of light from an object as an uneven pattern on the surface of a photosensitive material.

The relief-type hologram thus produced can be reproduced on a human body using a hologram original plate on which a concavo-convex pattern of interference fringes is formed. If such a large number of holograms are placed on cards such as cash cards, ID cards, driver's licenses, commuter passes, book covers, record jackets, clothing, etc., products with decorative effects can be created. can be produced cheaply and easily, and is also useful in determining whether the product itself is genuine or false.

In conventional cards with holograms, individual information such as code numbers, personal identification symbols such as names, lot numbers, product numbers, signatures, patterns or figures such as fingerprints and photographs are not recorded on the hologram, and are not recorded on the hologram, but are printed on embossed or signature fields. Alternatively, it is recorded on the card by writing on a magnetic stripe, pasting a sticker, etc.

However, in these cards, the embossed part has been cut or re-embossed, or the information written on the signature field or magnetic stripe has been erased.
There is a problem that these individual information can be easily forged.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide cards that have beauty and novelty due to holograms, and that are difficult to forge or alter with individual information recorded on the cards. It is to be.

[Means for solving problems]

The present inventors have discovered that it is effective to record individual information on a hologram not by holography but by other principles to achieve the object of the present invention.

When a light wave is applied to an object, its amplitude and phase are generally spatially modulated. The amplitude and wavelength of the modulated light waves from the object give information about the object's brightness and color, and the phase of the light waves from the object gives information about the object's position and direction. In optical information recording such as photography, information on only the amplitude and/or wavelength of light waves from an object is recorded on a photosensitive material through a lens, whereas in holography, light waves from each point on the object are recorded on a photosensitive material. The amplitude and phase of the hologram are recorded as interference fringes over a wide range of the hologram surface. Therefore, each point in the hologram contains information about each point on the object, and the object image can be reconstructed from this, and holograms have the property that even if a part of the hologram is missing, it will not have a major effect on the reconstructed image. ing.

The present inventors skillfully utilized this characteristic to complete the present invention. That is, the hologram-attached card of the present invention is a recording medium having first information recorded and reproduced by holography regarding the amplitude and phase of a light wave, and second information recorded and reproduced only regarding the amplitude and/or wavelength of the light wave. It is characterized by including.

In a preferred embodiment of the present invention, the recording medium described above can be a laminate of a hologram layer carrying first information and a thin film carrying second information.

In the case of a laminate as in the above embodiment, a hologram layer may be provided on the card base material via the above thin film. Also,
The above thin film can be a reflective metal thin film, and the hologram layer can be a relief-type reflective hologram.

In the embodiment in which the thin film is made of reflective metal MgI, the second information can be recorded on the thin film by partially changing the reflectance of the surface of the reflective metal thin film in contact with the hologram layer.

In the present invention, holography for recording first information includes Lippmann holography and Fresnel holography.
, Fourier Transform Holography, Fraunho 7? -Holography-, image brain holography, etc. There are various forms of holograms obtained by these holograms, such as image holograms, rainbow holograms, holographic stereograms, and holographic diffraction gratings. In the recording medium of the present invention, first information is recorded by the above-mentioned holography. This first information relates to the amplitude and phase of the light wave from the subject, and is recorded in the hologram as interference fringes.

The recorded first information is optionally reproduced by irradiating the hologram with reproduction illumination light. There are two types of holograms in the present invention: transmission type and reflection type. In the reflection type, a reflective layer such as a metal thin film is laminated on the surface of the hologram layer. Also,? It may also be a replica in which an uneven pattern is formed on the resin surface by opening the mold, such as a relief type hologram manufactured by A.

In this specification, light waves include not only visible light but also infrared and ultraviolet light.

Second information is recorded on the recording medium in the present invention. This second information relates to the amplitude and/or wavelength of the light wave, whereby the amplitude reproduces the intensity of the light wave and the wavelength reproduces the color.

However, unlike holographic recording, it does not contain information regarding the phase.

In the present invention, there are various methods for recording the second information as individual information such as characters, symbols, figures, etc.

If the hologram is a reflective type, recording can be done by partially modifying or changing the hologram layer itself, or by partially modifying or modifying the reflective layer to lower its reflectance, as shown in the following example. can. For example, methods for removing the anti-A4 layer by thermal, chemical, or mechanical methods, methods for deforming the reflective layer, methods for changing the color of the reflective layer, methods for thermally changing the phase of the reflective layer structure, polarizing properties. There are a magneto-optical method for changing the reflection layer, a method for partially forming a reflective layer by metal vapor deposition through a partial mask, and a method for replacing the material of the reflective layer. On the other hand, if the hologram is of a transmission type, the second information can be recorded by matting the hologram or by adding a mask layer. In the present invention, the second information recorded on the recording medium is optionally reproduced by irradiating the recording medium with a reproduction illumination light wave. The recording of the second information may occur before, after, or simultaneously with the recording of the first information.

In the present invention, the material that carries the first information may be any material as long as it can form a hologram, and may be a photosensitive material that records the wavefront of a light wave from an object, or a material that can be reproduced from its original plate. good. The recording medium according to the present invention has at least a hologram layer on which first information is recorded, and in addition to the hologram layer, a reflective thin film made of metal, resin, oil, etc., a protective layer for protecting the inside of the recording medium, and a hologram layer. It can be a laminate including a supporting base material, a contact layer for fixing the recording medium to the card surface, and the like. However, as long as a reflective effect can be expected, it is not necessarily necessary to separately provide a reflective thin film on the hologram layer. The layer or position where the second information is recorded is not limited as long as it does not contradict the purpose of the present invention.

The card in this specification refers to a sheet-like thing,
No restrictions on usage. Examples of the material include plastics such as polyvinyl chloride, polyethylene terephthalate, polyimide, polystyrene, polyvinyl butyralate, and polycarbonate, paper, metal, rubber, cloth, wood, glass, ceramics, and laminates thereof.

The card of the present invention includes a recording body having first information and second information. There are various ways to provide this recording body on the card, such as a method of forming the recording body on the surface of the card, a method of pasting a hologram layer on the card surface, and a method of transferring the hologram layer to the card surface. , a method of including a recording medium inside an optically transparent card, etc.

〔Effect of the invention〕

The following effects can be obtained by the hologram-equipped card of the present invention.

(a) The card with a hologram of the present invention has the advantage of a hologram that even if a part of the hologram is lost, it does not have a major effect on the reproduced image, and the hologram
This takes into account the disadvantage of holograms that it is not easy to record individual information such as code numbers and signatures on each hologram, so it is possible to record different secondary information without losing the primary information (common information) of the hologram. (individual information) can be easily multiplexed and recorded.

(b) First information and second information are recorded on the hologram in the card of the present invention, and since the hologram records information as minute interference fringes, it is impossible to forge or alter the individual information recorded on the hologram. If you try to do so, the hologram information will be disrupted or destroyed. therefore,
It is possible to provide a card that reproduces a three-dimensional image on the card, has a blackmailing effect, and has individual information that cannot be erased and is subject to alteration, so it has an excellent anti-counterfeiting effect.

〔Example〕

Next, the hologram-equipped card of the present invention is printed using a transfer hologram. The present invention will be specifically explained by showing an example of J construction. However, the present invention is not limited to these examples.

As shown in FIG. 1, a hologram-equipped card 1 in which a transfer hologram is transferred to a card is composed of a recording body 2 and a card base material 3, and the recording body 2 is attached to the surface of the card base material 3. There is. A partially enlarged sectional view of this card is shown in FIG. As shown in FIG. 2, the recording medium 2 in this embodiment consists of a protective layer 4, a hologram layer 5, a reflective metal thin film 6, and a heat seal layer 7 from the outside. and is attached to the surface of the card base material 3.

Materials for the card base material 3 in this embodiment include plastic, paper, metal, rubber, cloth, wood, glass, ceramics, and laminates thereof.

The material for the hologram layer in this example is a so-called ultraviolet curable resin that can be thermoformed during hologram molding (duplication) and has enough heat resistance to withstand the heat during transfer after hologram molding. , electron beam curing resin, thermosetting resin, naturally curing resin, etc. can be used.

The reflective metal thin film 6 in this embodiment is for imparting reflectivity to the hologram layer 5, and is made of Cr, Ti, etc.
, Fe, Go, Ni, Cu, A(J.

Au, Ge, Aj, Mu, Sb,
Pb, Pd.

It is formed from metals such as Cd, Bi 2 , Sn, Se, In, Ga, Rh, alloys thereof, oxides and nitrides thereof, or a combination (layer) of two or more thereof. This formation can be performed by a vacuum evaporation method, a sputtering method, an ion blating method, a plating method, or the like.

The heat seal layer 7 in this example is the card base material 3.
It plays the role of adhering the recording body 2 to the. As the heat seal layer, acrylic resin, vinyl resin, polyester resin, urethane resin, amide resin, epoxy resin, etc. can be used.

In this embodiment, the protective layer 4 can be made of various resins, glasses, metals, etc.

Example 1.

0.5μ thick acrylic resin on 0.75m+ thick PVC plastic card? lJl and 3μ
m-thick ultraviolet 1a1iir! a hologram layer of molded resin;
A card according to the present invention was prepared using a card with a hologram onto which a hologram was transferred, consisting of a 0.1 μm thick Sn vapor-deposited reflective layer and a 3 μm thick salt-and-vinegar type resin heat seal layer.

20m on the reflective layer in contact with the hologram layer of this card.
A W 830 rll semiconductor laser was focused by a NAO, 2 lens. A hole with a diameter of 6 μm was made in the reflective layer to reduce the reflectance of that portion. This operation was repeated to record the code number on the reflective layer in dot format to produce a recording medium.

This hologram-equipped card had a three-dimensional decorative effect due to the hologram and an anti-counterfeiting effect due to the G-inclusion of individual information that is difficult to alter.

Example 2゜A code number was printed on the protective layer of the same card as in Example 1 on the reflective layer using a thick film thermal head by applying energy of 30 mJ/m2. This code number was recorded clearly enough to be visible from the outside without impairing the three-dimensional effect of the hologram.

Example 3 A card similar to Example 1 except that an Aj vapor-deposited anti-rJJ layer was used in place of the Sni-deposited IJ4TI layer was given a heat absorbing area by writing a signature with black paint on top of the protective layer.

A flash exposure of 1 mJ/s2 was performed from above to make the reflective layer corresponding to the black heat absorbing portion matte, thereby making it possible to record the signature information on the reflective layer. Example 4 A partial mask consisting of a 100 μm line was formed on the protective layer surface of the same card as in Example 1, and xenon flash exposure was performed from above to apply energy of 1 mJ/rMR2 three times in succession. As a result, thermal deformation occurred in the unmasked reflective layer, reducing the reflectance of that area and recording individual information.

The hologram-equipped card of the present invention is not limited to the above embodiments, and various modifications are possible.

As shown in FIG. 3, an oversheet 9 can be provided on the hologram layer 5 and the card substrate 3. This oversheet 9 can protect the hologram layer 5 and improve the mechanical strength of the entire card. The material of the oversheet is preferably made of a highly transparent material so that the inside can be clearly seen from the outside. Anchor! l! 8 can also be provided.

[Brief explanation of drawings]

FIG. 1 is a side view of a card with a hologram used in the example, FIG. 2 is a partially enlarged cross-sectional view of the card shown in FIG. 1, and FIG. 3 is a cross-sectional view of a modified example of the card with a hologram. DESCRIPTION OF SYMBOLS 1... Card, 2... Recording body, 3... Card base material, 4... Protective layer, 5... Hologram layer, 6... Reflective metal thin film, 7... Beat seal Layer, 8...anchor one layer, 9...oversheet.

Claims (1)

[Claims] 1. A recording medium having first information recorded and reproduced by holography regarding the amplitude and phase of a light wave, and second information recorded and reproduced only regarding the amplitude and/or wavelength of the light wave. A card with a distinctive hologram. 2. The card according to claim 1, wherein the recording body is a laminate of a hologram layer carrying first information and a thin film carrying second information. 3. The card according to claim 2, wherein the hologram layer is provided on the card base material via a thin film carrying the second information. 4. The card according to claim 2 or 3, wherein the thin film carrying the second information is a reflective metal thin film, and the hologram layer is a relief-type reflective hologram. 5. The card according to claim 4, wherein the thin film records the second information by partially changing the reflectance of the reflective metal thin film surface in contact with the hologram layer.