JPH06282216A - Monochromatic light regenerative hologram and regenerative method and device therefore - Google Patents

Abstract

PURPOSE:To provide a monochromatic light regenerative hologram capable of preventing easy forgery with a dead copy, together with a regenerative method and device therefor. CONSTITUTION:This monochromatic light regenerative hologram 100 is to regenerate a hologram image by radiating monochromatic light at a specific angle to a hologram recording zone 101 where an interference fringe for forming a hologram image is provided. A plurality of hologram image groups different from each other in the directivity of the interference fringe are multi-recorded in the zone 101 and at the same time, each type of monochromatic light is concurrently radiated at angles corresponding to respective fringes. As a result, each hologram image group is concurrently regenerated, thereby providing the feature of the constitution of a single information pattern consisting of a character 'OK'. Also, even when a laser beam is radiated to the zone 101 unidirectionally, only a part of the hologram image groups can be dead copied and, therefore, the forgery thereof can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monochromatic light reproducing hologram capable of optically reading information, and more particularly to a monochromatic light reproducing hologram which is difficult to forge by dead copying, a reproducing method thereof and a reproducing apparatus therefor. It is about improvement.

[0002]

2. Description of the Related Art A monochromatic light reproducing hologram is a kind of recording medium having interference fringes for forming a hologram image on its surface, and the hologram recording area is irradiated with monochromatic light from a specific angle to produce a hologram. A hologram image is diffracted and reproduced at a specific angle. Since it is possible to record a three-dimensional image, it has been widely used in displays, but in recent years, holograms capable of optically reading information have been increasing. Here, the optically readable hologram refers to a hologram in which a hologram image composed of an information pattern that is supposed to be read later is recorded in the hologram forming area.

Generally, a character pattern (characters, numbers, alphabets, etc.) is used as the above-mentioned information pattern, and a holographic image composed of this character pattern is imaged and reproduced on an image forming surface such as frosted glass to make a visual judgment. The information has been confirmed by.

Recently, a relatively simple identification mark such as a bar code or a Carla code has been used as the information pattern, and the purpose is to mechanically read a hologram image formed of the identification mark by an optical sensor or the like. Holograms (called machine-readable holograms) have been proposed.

These optically readable holograms are incorporated in cards, products, etc. and are used as identification information for authenticity discrimination.

[0006]

However, in this kind of conventional hologram, the interference fringes forming the above-mentioned hologram image often have a certain directionality, so that it is a true hologram for a person having knowledge of the hologram. There is a problem that the information pattern recorded in the hologram recording area is copied onto another photosensitive material by applying a laser beam, and forgery by so-called dead copy is easy.

The present invention has been made by paying attention to such a problem, and an object thereof is to provide a monochromatic light reproducing hologram which is difficult to forge due to dead copy, and at the same time, a reproducing method and a method thereof. It is to provide a reproducing apparatus.

[0008]

That is, the invention according to claim 1 is to reproduce a hologram image by irradiating a hologram recording region provided with interference fringes forming a hologram image with monochromatic light from a specific angle. On the premise of an optical reproduction hologram, a plurality of hologram image groups having mutually different directions of interference fringes are multiplexed and recorded in the hologram recording area, and each hologram image group is reproduced to obtain independent information. According to the invention of claim 2, the hologram recording area provided with interference fringes forming a hologram image is irradiated with monochromatic light from a specific angle to form the hologram. Assuming a monochromatic light reproducing hologram for reproducing an image, a plurality of holograms whose interference fringes have different directions in the hologram recording area are provided. Beam images are multi-recorded, and is characterized in that each holographic images to form one information pattern being played simultaneously.

In the monochromatic light reproducing hologram according to the first and second aspects, a plurality of hologram image groups in which the directionality of the interference fringes are different from each other are multiplex-recorded in the hologram recording area. Even if the laser light is incident on the recording area from one direction, the monochromatic light reproducing hologram according to claim 1 can dead-copy only a part of the hologram image group forming each independent information pattern.
Further, in the monochromatic light reproducing hologram according to claim 2, only a part of the hologram image group forming one information pattern can be dead-copied, so that the information pattern recorded in the hologram recording area is completely dead. It is possible to make copying difficult.

The monochromatic light reproducing hologram according to the first and second aspects is basically a reflection hologram or a transmission hologram having a recording area including a Fresnel type or a Fourier transform type, and an example thereof is shown. A hologram (generally referred to as a master hologram) created in the first step in a known two-step hologram creation process corresponds to this. That is, even if the hologram recording area of the hologram called the master hologram is irradiated with white light, the image of the subject photographed in the first step is not reproduced or observed by the naked eye, and only the iris color is exhibited. is there. On the other hand, when a monochromatic light such as a visible light laser is emitted, the image of the subject photographed in the first step can be reproduced and observed with the naked eye.

In the monochromatic light reproducing hologram according to claims 1 and 2, a print image for the purpose of a decorative effect is provided in a part of the hologram recording area in which a hologram image group reproduced by monochromatic light is recorded. May be used (generally referred to as a print-integrated hologram) or may be equipped with a hologram pattern reproduced by white light (generally referred to as a rainbow hologram), and its configuration is arbitrary. Is.

As in the conventional case, the information patterns include character patterns (letters, numbers, alphabets, etc.) and relatively simple identification marks such as bar codes and carla codes. Then, in the invention according to claim 2, each hologram image group is reproduced at the same time to obtain one information pattern (for example, "OK", "authenticity", "convex").
Character pattern), each hologram image has a division pattern (“O” in the above example) of the information pattern.
In the case of "K""Shinsei", etc.
Etc. and a multi-divided pattern obtained by further sub-division).

Next, the invention according to claims 3 to 5 relates to a method for reproducing a monochromatic light reproducing hologram according to the invention described in claim 1 or 2.

That is, the invention according to claim 3 is based on the method for reproducing the monochromatic light reproducing hologram according to claim 1, and corresponds to each interference fringe of the hologram image group recorded in the hologram recording area. The monochromatic light reproduction according to claim 2 is characterized by irradiating each monochromatic light from a specific angle and reproducing each independent information pattern by each reproduced hologram image. Assuming a method of reproducing a hologram, a monochromatic light is simultaneously irradiated from a specific angle corresponding to each interference fringe of the hologram image group recorded in the hologram recording area,
It is characterized in that the reproduced hologram image groups are combined to reproduce one information pattern.

Further, in the reproducing method according to the third aspect, it is possible to surely perform the authenticity determination as the identification information by reproducing the independently recorded individual information patterns simultaneously or sequentially, and Also in the reproducing method according to the fourth aspect, it is possible to surely perform the authenticity determination as the identification information by simultaneously reproducing the divided patterns recorded individually and synthesizing one information pattern.

Here, when the monochromatic light reproducing hologram according to claim 2 is composed of a light transmitting hologram, a hologram image group reproduced by reflected diffracted light and a hologram image group reproduced by transmitted diffracted light are provided. Since it is possible to reproduce one information pattern by synthesizing, it is possible to improve the accuracy of the authenticity determination as the identification information.

The invention according to claim 5 is created for such a technical reason.

That is, the invention according to claim 5 is based on the reproducing method according to claim 4, wherein the monochromatic light reproducing hologram according to claim 2 is composed of a light transmitting hologram, and
Simultaneously irradiate each monochromatic light from a specific angle corresponding to each interference fringe of the hologram image group recorded in the hologram recording area, and reproduce the hologram image group reproduced by the reflected diffraction light and the transmission diffraction light. One information pattern is reproduced by synthesizing with the hologram image group.

In the invention according to claims 3 to 5, the light source for irradiating the hologram recording area with monochromatic light from a specific angle may be constituted by a plurality of light sources corresponding to the number of monochromatic light. Alternatively, a configuration may be adopted in which a plurality of corresponding monochromatic lights are obtained by using a mirror from one light source, which is arbitrary.

Next, the invention according to claim 6 is the above-mentioned claim 1.
Alternatively, the present invention relates to an apparatus for reproducing the monochromatic light reproduction hologram described in 2.

That is, the invention according to claim 6 is the invention according to claim 1.
Alternatively, on the premise of the apparatus for reproducing the monochromatic light reproducing hologram described in 2, the holding means for setting the monochromatic light reproducing hologram at a predetermined position, and the holding means are arranged on the upper side and the lower side through the center, respectively. A plurality of monochromatic light irradiating means for respectively irradiating monochromatic light from a specific angle to the hologram recording area of the monochromatic light reproducing hologram set at a predetermined position, and a hologram image reproduced by irradiating each monochromatic light. And an image forming means for forming an image of the group.

In the reproducing apparatus according to the sixth aspect of the invention, the holding means on which the monochromatic light reproducing hologram is set is provided with a plurality of monochromatic light irradiating means on the upper side and the lower side of the holding means in the center. Therefore, even if the monochromatic light reproducing hologram is composed of a reflective hologram or a light transmitting hologram, the monochromatic light reproducing hologram is arranged above or below the set monochromatic light reproducing hologram. There is an advantage that the information patterns recorded in the hologram recording area can be reproduced by selectively operating the generated monochromatic light irradiation means.

[0023]

According to the monochromatic light reproducing hologram according to the present invention, a plurality of hologram image groups in which the directivity of interference fringes are different are recorded in the hologram recording area. Even when laser light is incident on the hologram recording area from one direction, only a part of the hologram image group forming each independent information pattern can be dead-copied in the monochromatic light reproducing hologram according to claim 1, and In the monochromatic light reproducing hologram according to claim 2, since only a part of the hologram image group forming one information pattern can be dead copied, it is difficult to completely dead copy the information pattern recorded in the hologram recording area. It becomes possible.

According to the reproducing method of the third aspect of the present invention, the authenticity determination as the identification information can be surely performed by reproducing the independently recorded individual information patterns simultaneously or sequentially. On the other hand, according to the reproducing method of the fourth aspect of the present invention, the authenticity determination as the identification information is surely performed by reproducing the divided patterns recorded individually and synthesizing one information pattern. It becomes possible to do.

According to the reproducing method of the fifth aspect of the present invention, a hologram image group reproduced by reflected diffracted light and a hologram image group reproduced by transmitted diffracted light are combined to form one information pattern. Since the information is reproduced, the accuracy of the authenticity determination as the identification information can be improved by the amount of the combination of the two types of diffracted light.

According to the reproducing apparatus of the sixth aspect of the invention, the holding means on which the monochromatic light reproducing hologram is set is provided with a plurality of monochromatic light irradiating means on the upper side and the lower side of the holding means. Therefore, even if the monochromatic light reproducing hologram is composed of a reflective hologram or a light transmissive hologram, it is located above or below the set monochromatic light reproducing hologram. By selectively operating the arranged monochromatic light irradiation means, the information patterns recorded in the hologram recording area can be reproduced respectively.

[0027]

Embodiments of the present invention will now be described in detail with reference to the drawings.

Example 1 First, a master hologram, which is an original plate of a metal stamper for producing a hologram, was manufactured by the following steps.

{Creation of Master Hologram} FIG.
It is explanatory drawing which showed the relationship between one information pattern (consisting of the character of OK) and a division image (pattern) in the illustration.
In this embodiment, a transparent original is created with the information pattern as two divided images A and B. The information pattern may be either a halftone dot image or a continuous tone image.

FIG. 2 is an explanatory view showing an example of a method of photographing a hologram using the transparent original. In this figure, the transparent document 4 of the divided image (A) consisting of the above-mentioned character O and the diffusion plate 5 are arranged on the upper side in a stacked state, and the support coated with the photosensitive material 2 on the lower side. 1 is arranged. Then, the incident light 11 from above the diffusion plate 5
Is incident, the light is diffused by the diffusion plate 5 and the transparent original 4 is selectively transmitted. The light transmitted through the transparent original 4 is referred to as object light 12. The object light 12 interferes with the reference light 13 radiated in the direction of 12 o'clock when the support 1 coated with the photosensitive material 2 is viewed from above and obliquely from the side when viewed from above, and the photosensitive material 2 is thus exposed. Record the interference fringes on. The first exposure time is set to about 3 seconds.

Next, the transparent original 4 of the divided image (B) consisting of the letter K is replaced, and the support 1 coated with the photosensitive material 2 is rotated by 90 degrees about the center of the support surface. The relative position with respect to the transparent original 4 is changed, and the object light 12 and the reference light 13 are irradiated for 4 seconds in the same manner as the first exposure, and the interference fringes 4a corresponding to the letter O formed at the first time and the interference fringes 4a The interference fringes 4b corresponding to the letter K having a different directionality of 90 degrees were multiple-recorded on the photosensitive material 2 (see FIG. 3). The rotation angle of the support 1 is not limited to 90 degrees, and may be rotated at another angle. In place of the method of rotating the support 1, the second condition of incidence of the reference light 13, that is, the support 1 coated with the photosensitive material 2 is viewed from above in the direction of 3 o'clock and from the side surface. It may be irradiated obliquely from above. Further, in this embodiment, the divided image (A) composed of the character O and the divided image (B) composed of the character K are doubly recorded, but the directionality of more divided images is mutually changed. Multiple recording may be performed.

After the double exposure process as described above, the photosensitive material 2 was developed to form a master hologram having a concavo-convex pattern 20 as shown in FIG. 4 (A).

{Preparation of monochromatic light reproducing hologram} Next,
Using this master hologram, a metal stamper was created by a known electroforming operation.

That is, as shown in FIG. 4B, a conductive thin film 21 of gold, silver or the like is formed on the surface of a master hologram having a concavo-convex pattern 20 by vapor deposition or electroless plating, and this conductive thin film is formed. 21 is used as an electrode, and a plated layer 2 of nickel or the like is formed on the conductive thin film 21 by electroplating
2 was formed (see FIG. 4C), and the plating layer 22 was peeled from the conductive thin film 21 to manufacture a metal stamper 25 as shown in FIG. 4 (D).

Then, using this metal stamper 25, a hologram seal 6 as shown in FIG. 5 was manufactured.

That is, the hologram sticker 6 includes a sheet base material 61 and the sheet base material 61 as shown in FIG.
A peelable protective layer 62 which is provided so as to be peelable above, a hologram layer 63 having an uneven pattern 60 formed by heating and pressing the metal stamper 25, and a light reflection provided along the surface of the uneven pattern 60. The layer 64, the adhesive layer 65 uniformly provided on the light reflection layer 64, and the release sheet 66 laminated on the adhesive layer 65 constitute the main part.

First, the sheet base material 61 has a role of protecting the hologram layer 63. For example, a resin film such as polyester or polycarbonate can be applied, and the film thickness thereof is set to about 50 to 100 μm. There is.

The peelable protective layer 62 is, for example,
Acrylic resin, a mixture of acrylic resin and vinyl resin, etc. are made into paint, and then coated and dried by known methods such as solvent coating methods such as bar coating, blade coating, air knife coating, gravure coating, and roll coating, or screen printing methods. And a resin layer having a thickness of about 1 to 2 μm.

On the other hand, the hologram layer 63 is, for example,
An acrylic resin, a urethane resin, a cellulose acetate resin, a nitrocellulose resin, or the like is made into a paint, and the resin layer having a thickness of 0.5 to 2 μm is formed by the same coating means as the above-mentioned peelable protective layer. Metal stamper 25
Is provided with an uneven pattern 60 composed of a plurality of interference fringes formed by heating and pressing.

The light reflection layer 64 provided along the surface of the concavo-convex pattern 60 is preferably made of a metal having a high surface reflectance, such as aluminum or tin. These metals are preferably vacuum-deposited, sputtered, It can be formed by a film forming means such as an ion plating method, and its film thickness is preferably about 300 to 1000 angstroms. The light reflecting layer 64 is made of the above-mentioned metal.
When the above-mentioned structure is used, the obtained hologram becomes a light-reflecting type hologram. However, when a transparent material having a refractive index larger than that of the material forming the hologram layer 63 is applied instead of the above metal, a hologram of a light-transmitting type is obtained. It becomes possible to do.

As such a transparent material, for example,
Sb ₂ S ₃ , Fe ₂ O ₃ , TiO ₂ , CdS, Ce
O ₂ , PbCl ₂ , CdO, Sb ₂ O ₃ , Bi ₂ O ₃ ,
ZnS, WO ₃ , SiO, In ₂ O ₃ , PbO, Ta ₂
O ₃ , ZnO, CaO · SiO ₂ , ZrO, Cd
₂ O ₃ , Al ₂ O _{3 and the} like can be mentioned, and they are formed on the hologram layer 63 by a film forming means such as an EB vapor deposition method, a vacuum vapor deposition method, a sputtering method, a reactive sputtering method and an ion plating method. be able to. However, this light transmission hologram can also be used as a light reflection hologram.

Further, the adhesive layer 65 is a resin layer having a thickness of 0.5 to 2 .mu.m, which is formed by the above-mentioned coating means and contains acrylic resin, vinyl resin or the like as a main component, and the peeling protection is performed. The adhesive strength is stronger than the adhesive strength of the layer 62.

Then, the release sheet 66 made of release paper or the like is peeled off from the hologram seal 6 thus constructed to expose the adhesive layer 65, and the adhesive layer 65 is attached to a card (not shown) or the like to form a monochrome image. A light reproduction hologram was created.

Incidentally, when a laser beam was made to enter the monochromatic light reproduction hologram from one direction and a dead copy was attempted, only a part of the information pattern consisting of OK characters could be reproduced.

Next, an apparatus for reproducing the monochromatic light reproducing hologram thus created will be described.

{Playback Device} This playback device 7 is shown in FIGS.
A hologram set plate 72 having an opening 71 for setting a hologram in the center thereof as shown in FIG.
ON and OFF by the switches S1 to S4 arranged on the upper side and the lower side of the hologram set plate 72 in the center and connected to a power source (not shown).
Four visible light laser light sources L1 to L provided so as to be drivable
4, lenses 73 to 76 for forming an image of the visible light laser emitted from each of the visible light laser light sources L1 to L4 on the hologram recording area of the set hologram, and an image forming means for displaying the reproduced hologram image group. Of the screen 77 and a lens 78 for forming a hologram image group on the screen 77.
At least one of the four side plates forming the side wall of the reproducing device is formed so as to be opened when the hologram is set in the opening 71.

First, four visible laser light sources L1 to L4
Is for irradiating a visible light laser of, for example, 670 nm with a power source (not shown), the visible light laser light sources L1 and L2 are used for reproducing a reflection hologram, and the visible light laser light sources L3 and L4 are light transmission holograms. Applies to playback. As this visible light laser light source, a He-Ne visible light laser whose peak wavelength is 633 nm can be used. The number of visible light laser light sources is not limited to four, and may be increased as a matter of course.

The visible light laser light source L1 is arranged above the hologram set plate 72, and, for example,
When θ ₁ = 60 degrees, the visible light laser is irradiated from the direction of the X axis (see FIGS. 7 and 8), and the visible light laser light source L2 is also arranged above the hologram set plate 72. For example, θ ₂ = The visible light laser is emitted from the Y-axis direction (see FIG. 8) at 60 degrees. On the other hand, the visible light laser light source L3 is disposed below the hologram set plate 72, and is irradiated with the visible light laser from the X-axis direction (see FIG. 7) at θ ₃ = 60 degrees, for example. L4 is also arranged on the upper side of the hologram set plate 72, and is irradiated with a visible light laser from the Y-axis direction at θ ₄ = 60 degrees, for example. In addition, all the irradiation positions of the visible light laser of the visible light laser light sources L1 to L4 are the hologram set plate 72.
In order to irradiate the visible light laser light source L
The irradiation angles θ _{1 to} θ _{4 of 1 to} L4 and the lenses 73 to 76 arranged on this optical path are provided with a mechanism capable of moving and adjusting in the range of 0 to 90 degrees. That is, according to the incident angle of the reference light at the time of shooting in the master hologram, the incident angle of the object light, and other conditions at the time of shooting, the above θ ₁
This is because ~ ₄ is not always 60 degrees.

Further, as shown in FIG. 8, the angle θ ₅ formed by the visible light laser light source L1 and the visible light laser light source L2 is 9
The angle θ ₅ is set to 0 degrees, but this angle θ ₅ is an angle formed by the interference fringes of the master hologram that has been double-exposed (as described above, the directionality of the interference fringes 4a and 4b differs by 90 degrees. ).

Next, on the screen 77, a hologram image group from the monochromatic light reproducing hologram set in the opening 71 of the hologram set plate 72 is projected. In order to visually confirm this reproduced image, it is preferable to view it from directly above or below the screen 77.
Further, it is preferable to apply a semitransparent material such as frosted glass to the material of the screen 77.

The lenses 73 to 76 have the function of squeezing the visible light lasers emitted from the respective visible light laser light sources L1 to L4 and converging them to irradiate them onto the hologram area of the hologram. Can be applied. The irradiated visible light laser is diffracted in the hologram recording area, converged by the lens 78, and imaged on the screen 77 to reproduce an information pattern composed of a hologram image group.

If the photographing conditions of the master hologram (for example, the exposure conditions) change, it is necessary to change the magnification of the lens and the like accordingly. Therefore, in this reproducing apparatus, as shown in FIG. 7, the distance α between the visible light laser light source L1 and the lens 73, the distance β between the lens 73 and the hologram set plate 72, the hologram set plate 7
The distance γ between the lens 2 and the lens 78 and the distance δ between the lens 78 and the screen 77 are variably provided, and can be adjusted according to the type of hologram set in the opening 71 of the hologram set plate 72. The same mechanism is incorporated in the visible light laser light sources L2, L3, L4, etc. other than the visible light laser light source L1.

Then, as shown in FIG. 9, the light transmission hologram 100 in which the interference fringes 4a corresponding to the character O and the interference fringes 4b corresponding to the character K whose directionality differ by 90 degrees are multiplexed and recorded. The hologram recording area 101 of the hologram 100 is set by setting it in the opening 71 of the hologram set plate 72 and operating the switches S1 and S4.
When the visible light laser light source L1 and the visible light laser light source L4 are respectively irradiated to the visible light lasers, the characters "OK" in which the hologram image corresponding to the character O and the hologram image corresponding to the character K are combined are displayed on the screen. Reproduced in the central part of 77.

When a laser beam was made to enter the hologram 100 from one direction and a dead copy was attempted, only a part of the information pattern consisting of OK characters could be reproduced as described above.

Therefore, even if the hologram relating to this dead copy is set in the reproducing apparatus and the visible light laser light sources L1 and L4 are respectively irradiated with the visible light laser, the character "OK" is reproduced. Instead, it was instantly confirmed to be forged.

On the other hand, the reflection type hologram 200 in which the same interference fringes are recorded multiple times is also set in the opening 71 of the hologram set plate 72 and the switch S is used.
When the visible light laser light source L1 and the visible light laser light source L2 irradiate the hologram recording area 201 of the hologram 200 with the visible light lasers 1 and S2, respectively, the hologram image corresponding to the character O and the character K are displayed. The character “OK” on which the corresponding hologram image is combined is reproduced in the center of the screen 77.

[Embodiment 2] FIG. 11 shows two information patterns (two patterns of OK characters provided in directions orthogonal to each other), divided images (a pattern A of one OK character, and the other). FIG. 8 is an explanatory diagram schematically showing a relationship with a pattern B) composed of OK characters. And
In this embodiment, a transparent original is created using the above information pattern as two separated images of A and B, and a master hologram is created under the same conditions as in the first embodiment, and the master hologram is reflected as shown in FIG. A hologram 300 of a monochromatic light reproduction type was manufactured.

Then, as shown in FIG. 13, the hologram 300 is set in the opening 71 of the hologram set plate 72, and the switches S1 and S2 are actuated to the hologram recording area 301 of the hologram 300. When the visible light laser light source L2 and the visible light laser light source L2 were simultaneously irradiated, two information patterns each consisting of the letters "OK" were reproduced on the screen 77 in the X-axis direction and the Y-axis direction shown in FIG. .

When the visible light laser light source L1 and the visible light laser light source L2 were separately irradiated, individual information patterns consisting of the letters "OK" corresponding to the respective directions were reproduced separately.

Further, when a laser beam was made to enter the hologram 300 from one direction and a dead copy was attempted, only one information pattern consisting of OK characters could be reproduced.

Therefore, even if the hologram relating to this dead copy is set in the above reproducing apparatus and the visible light laser is irradiated from the visible light laser light source L1 and the visible light laser light source L2, respectively, the other "OK" character is displayed. It was not reproduced and was instantly confirmed to be forged.

[0062]

According to the first and second aspects of the present invention, since a plurality of hologram image groups in which the directionality of interference fringes are different from each other are multiplex-recorded in the hologram recording area, the hologram recording area can be recorded. Even if the laser light is incident from one direction, the monochromatic light reproduction hologram according to claim 1 can dead-copy only a part of the hologram image group forming each independent information pattern, and the monochromatic light according to claim 2 In the light reproduction hologram, since only a part of the hologram image group forming one information pattern can be dead-copied, forgery due to dead-copy can be prevented.

On the other hand, according to the third aspect of the invention, the authenticity determination as the identification information can be surely performed by reproducing the independently recorded individual information patterns simultaneously or sequentially, and According to the invention of claim 4, the divided patterns recorded individually are reproduced simultaneously.
By synthesizing two information patterns, there is an effect that the authenticity determination as the identification information can be surely performed.

According to the fifth aspect of the invention, one information pattern is reproduced by combining the hologram image group reproduced by the reflected diffracted light and the hologram image group reproduced by the transmitted diffracted light. The combination of the two types of diffracted light has the effect of improving the accuracy of the authenticity determination as the identification information.

Further, according to the invention of claim 6, a plurality of monochromatic light irradiating means are provided on the upper side and the lower side of the holding means having the monochromatic light reproducing hologram set in the center. Whether the monochromatic light reproducing hologram is composed of a reflective hologram or a light transmitting hologram, the monochromatic light reproducing hologram is arranged above or below the set monochromatic light reproducing hologram. By selectively operating the monochromatic light irradiation means, it is possible to reproduce each of the information patterns recorded in the hologram recording area.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a relationship between an information pattern and a divided image according to a first embodiment.

FIG. 2 is an explanatory diagram showing an example of a hologram photographing method according to the first embodiment.

FIG. 3 is a schematic perspective view of a master hologram in which multiple recording is performed.

FIGS. 4A to 4D are process explanatory views for manufacturing a metal stamper by a known electroforming operation using a master hologram.

FIG. 5 is a structural explanatory view of the hologram sticker according to the first embodiment.

FIG. 6 is a perspective view of a schematic configuration of the reproducing apparatus according to the first embodiment.

FIG. 7 is a side view of the reproducing device with one side plate removed.

FIG. 8 is a plan view of the reproducing device with a screen removed.

FIG. 9 is a schematic perspective view of a reproducing device in which a hologram is set.

FIG. 10 is a schematic perspective view of a reproducing device in which a hologram is set.

FIG. 11 is an explanatory diagram showing a relationship between an information pattern and divided images according to the second embodiment.

FIG. 12 is an explanatory diagram showing a hologram reproducing method according to the second embodiment.

FIG. 13 is a schematic perspective view of a reproducing device in which a hologram according to the second embodiment is set.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support 2 Photosensitive material 4 Transparent original 4a Interference fringe 4b Interference fringe 5 Diffusion plate 7 Reproducing device 11 Incident light 12 Object light 13 Reference light 25 Metal stamper 60 Concavo-convex pattern 61 Sheet base material 62 Peeling protection layer 63 Hologram layer 64 light Reflective layer 65 Adhesive layer 66 Release sheet 72 Hologram set plate 77 Screen 100 Hologram 101 Hologram recording area 200 Hologram 201 Hologram recording area 300 Hologram 301 Hologram recording area L1 Visible light laser light source L2 Visible light laser light source L3 Visible light laser light source L4 Visible Optical laser light source

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takehide Kita 1-5-1 Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (72) Naoaki Shindo 1-5-1 Taito, Taito-ku, Tokyo Toppan Imprint Co., Ltd.

Claims (6)

[Claims] 1. A monochromatic light reproducing hologram for reproducing a hologram image by irradiating a hologram recording area provided with interference fringes forming a hologram image with a monochromatic light from a specific angle. A monochromatic light reproducing hologram characterized in that a plurality of hologram image groups having mutually different stripes are recorded in multiplex, and each hologram image group is reproduced to form an independent information pattern. 2. A monochromatic light reproducing hologram for reproducing a hologram image by irradiating a hologram recording area provided with interference fringes forming a hologram image with a monochromatic light from a specific angle, to interfere with the hologram recording area. A monochromatic light reproducing hologram characterized in that a plurality of hologram image groups having mutually different stripes are recorded in multiplex, and each hologram image group is simultaneously reproduced to form one information pattern. 3. A method for reproducing a monochromatic light reproducing hologram according to claim 1, wherein each monochromatic light is irradiated from a specific angle corresponding to each interference fringe of the hologram image group recorded on the hologram recording area. Then, a method for reproducing a monochromatic light reproducing hologram is characterized in that an independent information pattern is reproduced by each reproduced hologram image. 4. A method for reproducing a monochromatic light reproducing hologram according to claim 2, wherein each monochromatic light is simultaneously emitted from a specific angle corresponding to each interference fringe of the hologram image group recorded in the hologram recording area. A reproducing method of a monochromatic light reproducing hologram, characterized by irradiating and synthesizing a reproduced hologram image group to reproduce one information pattern. 5. The monochromatic light reproducing hologram according to claim 2 is composed of a light transmitting hologram, and the identification corresponding to each interference fringe of the hologram image group recorded in the hologram recording area. It is characterized in that each monochromatic light is simultaneously irradiated from an angle, and the hologram image group reproduced by the reflected diffraction light and the hologram image group reproduced by the transmitted diffraction light are combined to reproduce one information pattern. The method for reproducing a monochromatic light reproducing hologram according to claim 4. 6. An apparatus for reproducing a monochromatic light reproducing hologram according to claim 1 or 2, wherein a holding means for setting the monochromatic light reproducing hologram at a predetermined position, and a holding means above the holding means in the center thereof. Side and lower side, respectively, a plurality of monochromatic light irradiation means for irradiating monochromatic light from a specific angle to the hologram recording area of the monochromatic light reproducing hologram set at a predetermined position, and irradiating each monochromatic light And an image forming means for forming an image of the reproduced hologram image group, and a reproducing device for a monochromatic light reproducing hologram.