JPH1055130A - Propriety recognizing method and recognizing device used for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a propriety recognizing method and a recognizing device used for it accurately discriminating whether articles are proper or not. SOLUTION: An image made by the Fourier-transform hologram of encoded information is formed at a sheet 20 on a seal. A laser beam is radiated perpendicularly from the laser beam emitting device 104 of the recognizing device 100 to the sheet 20. The image formed at the sheet 20 is reproduced on a screen surface by receiving the laser beam reflected by the surface of the sheet 20 at a screen 110. Then, it is confirmed by seeing from the aperture part 108 of a case 102 whether the laser beam is cast on the sheet 20 or not.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recognizing validity and a seal and a recognizing device used therefor, and more particularly to a method for recognizing validity and a method for recognizing that an article stuck thereto is not a counterfeit. It relates to the recognition device used.

[0002]

2. Description of the Related Art Hitherto, in order to clarify the source of an article, a label or a sticker has been attached to the article.
This label or sticker may include, for example, product name, producer name,
The name of the seller, the date of manufacture, the serial number, and the like are printed, clarifying where the responsibility for the article is.

[0003] Further, in order to prevent such forgery of labels and seals, a seal having an image formed by a hologram is attached. An image is formed on such a label or seal by, for example, a rainbow hologram. The image formed by such a rainbow hologram can reproduce a relatively clear three-dimensional image even when white normal light such as sunlight is used as reproduction light.

[0004] In order to form an image using such a rainbow hologram, a relatively sophisticated technique is required, and it cannot be easily forged. Therefore, by attaching the label or the seal to the article, it can be proved that the article is an article produced by the original producer and an article sold by a valid seller.

[0005]

However, printed labels and stickers are relatively easy to forge.
For this reason, it is also possible to attach a forged seal or the like to a bad product to deceive a retail store or a consumer. Also, in this case, manufacturers and sellers of legitimate articles will lose their credibility.

Further, it is difficult to forge a label or a seal on which a rainbow hologram is formed. Recently, it has become possible to forge a seal on which an image is formed by such an image hologram. The image formed on such a counterfeit seal is not as sharp as the image formed by a highly skilled creator, but since the image is confirmed by mere visual inspection, the clerk at the retail store or It is difficult to ascertain whether consumers are legitimate or counterfeit.

[0007] Therefore, a main object of the present invention is to provide a validity recognizing method capable of accurately determining whether an article is valid. Another object of the present invention is to provide a recognition device used in such a validity recognition method.

[0008]

SUMMARY OF THE INVENTION The present invention provides a validity recognition method using a seal formed by forming an image of a coded information by a Fourier transform hologram, and a recognition device for reading the image formed on the seal. There, irradiate a laser beam on the surface where the image of the seal was formed by the recognition device,
This is a legitimacy recognition method for recognizing legitimacy by reproducing an image on a screen of a recognition device by a laser beam reflected on a surface on which an image is formed. Further, the present invention relates to a recognition device for recognizing an image of a coded information by a Fourier transform hologram, comprising a case, a laser light emitting device attached to the case, and a laser light emitted by the laser light emitting device. And a screen mounted in the direction of reflection of the laser light to receive the light reflected on the image forming surface.

[0009]

The image formed by the Fourier transform hologram of the present invention is not reproduced by natural light, and the image of the information encoded on the screen is reproduced by reflecting the laser beam on the surface on which the image is formed. An image formed by the Fourier transform hologram is formed by interference fringes of laser light, and has a resolution of 1000 to 2000 lines / mm.

[0010]

According to the present invention, since an image is not reproduced by natural light, it is not possible to see what kind of image is formed on the seal by mere visual inspection. Therefore, in order to reproduce the image formed on the seal, a recognition device for irradiating a laser beam and reproducing the image is required, and if this recognition device is used, a clear image can be reproduced. Therefore, by attaching a seal formed with an image of the coded information by the Fourier transform hologram to the article, the validity can be confirmed by the recognition device.

By forming a code unique to a product, a manufacturer, a seller, or the like, for example, as an image of the seal, the legitimacy of the source of the article can be confirmed from the code. Moreover, the Fourier transform hologram is an image formed by interference fringes of a laser beam, has a high resolution, and is more precise and finer than a rainbow hologram, so that it is difficult to forge. Therefore, forgery of the sheet for confirming the validity can be prevented.

Further, in a seal on which an image is formed by a Fourier transform hologram, an image is always reproduced at a fixed position on a screen by irradiating a laser beam to any place on the surface by appropriately setting photographing conditions. be able to. Therefore, even if the seal is broken, if a part remains, the coded information can be reproduced, and the validity can be confirmed. Further, even if the distance between the recognition device and the seal changes, the image reproduced on the screen can be made clear, and the validity can be easily confirmed.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0014]

FIG. 1 is an illustrative view showing one example of a seal which can confirm the validity by using the validity recognition method of the present invention. The seal 10 includes a sheet substrate 12 formed of, for example, paper or a synthetic resin. Sheet substrate 12
Is formed with a display 14 such as a product name, a manufacturer name, a seller name, a manufacturing date, a manufacturing number, and the like. In addition, sheet base 1
A sheet 20 on which an image based on a Fourier transform hologram is formed is adhered on one main surface of the second. Further, an adhesive layer is formed on the other main surface of the sheet base 12.

In order to form an image using a Fourier transform hologram, first, as shown in FIG. 2, an original photographing plate 22 is formed. For example, a pattern such as an authentication code is formed on the photographing original plate 22. As the authentication code, a code obtained by converting a number into a bar code or a code obtained by coding a number as shown in FIG. 3 is used. In FIG. 3, any one of the four cells is painted out to correspond to the number.

These authentication codes are formed as a pattern on, for example, a stainless steel plate, and a photographing original plate 22 is formed. In this case, the pattern is formed on the stainless steel plate by the laser processing machine, and then the black paint is finished in a satin finish, thereby forming the original plate 22 for photography. As another method, the original plate for photography 22 may be formed by printing a pattern on a squirrel-type film. Further, a photoresist pattern is formed on a stainless steel plate using a squirrel-type film on which the pattern has been baked.
After etching with an iron solution, Parker processing may be performed to obtain the original plate 22 for photography.

A Fourier transform hologram is produced using the obtained original plate for photographing 22 and the optical system shown in FIG. In this optical system, laser light is emitted from a laser device 30, and this laser light is
Divided into two. The laser light reflected by the half mirror 32 is reflected by the reflection mirror 34 and is spread by passing through the lenses 36 and 38. The expanded laser light
The light becomes object light through the diffusion plate 40 and the original plate 22 for photographing. This object light is converged by the Fourier transform lens 42 and irradiated on the photographic dry plate 44. At this time, the original plate for photography 2
2 and the photographic plate 44 are set at the front and rear focal points of the Fourier transform lens 42. In this example,
The Fourier transform lens 42 has a short focal length of about 50 mm. By using the diffusion plate 40, the information of the original plate 22 for photographing can be uniformly dispersed.

The laser light transmitted through the half mirror 32 is reflected by the reflection mirror 46 and spread by the lenses 48 and 50. The spread laser light is irradiated on the photographic dry plate 44 as reference light at a predetermined angle with respect to the object light. Therefore, interference fringes are formed by the object light and the reference light, and the interference fringes are recorded on the photographic dry plate 44. In this way, the information of the photographic original plate 22 is stored in the photographic plate 44.
It is formed as an image by a Fourier transform hologram.

In order to form an image using a Fourier transform hologram, a method of a lensless Fourier transform hologram may be used as shown in FIG. In this method, the object light is applied to the photographic plate 44 without being converged by the Fourier transform lens. Further, the reference light is expanded by one lens 48 and is applied to the photographic dry plate 44. At this time, the distance between the photographing original plate 22 and the photographic dry plate 44 and the distance between the lens 48 and the photographic dry plate 44 are set to be the same. In this method, the object light is a Fresnel diffracted wave on the surface of the photographic dry plate 44, but at the time of recording, the secondary phase term is canceled with the secondary phase term of the reference light, and becomes a hologram similar to a Fourier transform hologram. .

In these holograms, interference fringes are recorded by irregularities on the surface. Therefore, a mold can be made from these irregularities and can be copied in large quantities at low cost by hot pressing on a thermoplastic. A method of manufacturing the embossed hologram obtained in this manner will be described with reference to FIG.

First, as shown in FIG. 1A, the obtained hologram is prepared as an original plate 60. This original plate 60
Then, as shown in (B), a metal such as Au or Ag is deposited to form a metal layer 62 having conductivity. This metal layer 62 has a nickel plating layer 6 as shown in FIG.
4 are formed. Then, as shown in (D), the nickel plating layer 64 is peeled off to form a mold 66. By hot pressing the thermoplastic resin using the mold 66, a hologram forming layer 68 which is a copy of the original plate 60 is obtained as shown in FIG. Next, as shown in (F), a metal such as Al is vapor-deposited on the hologram surface of the hologram-forming layer 68 to form a vapor-deposited layer 70, and an adhesive layer 72 is formed on the vapor-deposited layer 70. Further, on the surface of the hologram forming layer 68 where no hologram is formed, a release layer 7 is provided.
4 and the base material 76 are formed. Thus, the embossed hologram seal 78 is obtained.

Then, as shown in (G), the obtained embossed hologram seal 78 is adhered to the sheet base material 12 and the base material 76 is peeled off to form the sheet 20 on which an image is formed by the Fourier transform hologram. Is done. In this sheet 20, even if the hologram forming layer 68, the vapor deposition layer 70, the adhesive layer 72, and the release layer 74 are included,
m, and can be formed so as to have almost no step with the sheet substrate 12.

The image recorded on the sheet 20 is reproduced by the recognition device 100. The recognition device 100 is used by placing it on a sheet 20, as shown in FIG. This recognition device 100 includes a case 102 as shown in FIGS. 8A and 8B. A laser light emitting device 104 is mounted in the case 102. The laser light emitting device 104 is provided with a diverging lens 106, and the width of the laser light can be changed by adjusting the diverging lens 106. In particular, by increasing the width of the laser beam, safety when hitting the human eye or the like is increased.

The case 102 near the laser light reflecting portion
An opening 108 is formed at the corner of the. This opening 1
08, the laser light is applied to the sheet 20.
You can check whether it is hitting the surface. Further, a laser light emitting device 104 is provided in the case 102.
A screen 110 is attached adjacent to. The screen 110 is attached so that its main surface is parallel to the main surface of the sheet 20. And this screen 1
The laser light reflected by the sheet 20 hits the image 10, and an image formed on the sheet 20 is reproduced. The screen 110 has a transmissive diffusion property, and fine irregularities are formed on the surface thereof. This is to sharpen the reproduction of the image by the laser light.

Further, a battery 112 for driving the laser light emitting device 104 is housed in the case 102. Further, a switch 114 for emitting laser light by the laser light emitting device 104 is attached to the outer surface of the case 102. As the switch 114, for example, a switch with a timer may be used, and the switch 114 may be automatically turned off a predetermined time after the laser light is emitted. This can prevent the battery 112 from being consumed due to forgetting to turn off the switch 114.

Using this recognition device 100, the seal 10
When the legitimacy of the article on which the sheet is adhered is determined, the laser beam emitted from the laser beam emitting device 104
Irradiated perpendicular to the surface of This laser light becomes the reproduction light, and an image is reproduced on the screen 110. This image is an image transferred to the sheet 20 and is a coded information as described above. Therefore, by reading the image of the sheet 20 with the recognition device 100, the legitimacy of the article can be determined. By irradiating the sheet 20 with laser light obliquely, an image can be reproduced on a screen perpendicular to the surface of the sheet 20. However, in this case, the laser light emitting device 10
4 has to be mounted diagonally, which is cumbersome to manufacture. When the sheet 20 is small, it is difficult to irradiate the laser light obliquely. Therefore, the laser light
It is desirable to irradiate the surface of the sheet 20 vertically.

When the legitimacy of an article is determined using this method, the contents recorded on the sheet 20 cannot be known unless the recognition device 100 is used, so that codes unique to the manufacturer or the seller are recorded. By doing so, the legitimacy of the article can be clearly determined. Further, the image of the conventional rainbow hologram has a resolution of 100 to 200.
Whereas the Fourier transform hologram is 1000-2000 lines / mm, which is technically difficult to forge. Further, when the hologram is photographed, if the diffusion plate 40 is made special, the same hologram cannot be produced unless the same diffusion plate is used, and it is difficult to forge. In order to forge a hologram, the imaging conditions must be the same, and the wavelength of the laser beam, the incident angle of the object light and the reference light, and the position and size of the original plate for photography and the photographic plate must be matched. is there. It is difficult to find out these photographing conditions from the sheet 20 attached to the article, and it is difficult to forge the sheet 20. From these facts, the validity recognition method of the present invention is:
It is more reliable than a printed seal or a conventional rainbow hologram.

In the hologram formed by the above-described method, since the image is taken by using the diffusion plate 40, the information of the original plate for imaging 22 is diffused to the photographic dry plate 44. Even if light is irradiated, an image can always be reproduced at a fixed position on the screen 110. Therefore, even if the sheet 20 is damaged, it can be confirmed if a part remains. Furthermore, if the focal point of the Fourier transform lens 42 is set to be a short focal point when photographing a hologram, the image will be focus-free at a distance longer than the focal point during image reproduction. Therefore, even if the distance between the sheet 20 and the recognition device 100 is changed, an in-focus image can be reproduced on the screen 110.

The recognition device 10 used in this method
0 can be made safe by using a low-power laser emitting device 104, can be manufactured at low cost, and can be downsized. Therefore, this recognition device 1
It is possible to reduce the burden on the expense of a retail store using 00.

In the above-described embodiment, the seal 10 is formed by attaching the sheet 20 to the sheet base 12, but as shown in FIG. 9, the seal 10 is formed without using the sheet base. May be. In this case, an Al deposition layer 80 is formed on the hologram forming layer 68 shown in FIG. 6E, and an adhesive layer 82 is further formed. Then, the display 14 may be formed by printing the hologram forming layer 68 itself. At this time, by not printing on a part of the sheet 20, an image by the hologram can be left.

This validity recognition method is useful for validity recognition of various articles, and if the seal 10 is attached to the article, the validity and safety of the article can be ensured. Articles that use the seal 10 include, for example, credit cards, telephone cards, CPU boards, rice, stamps, watches, ties, belts, golf balls, golf clubs, rackets, jewelry, and the like. By changing the size, it is useful for recognizing the validity of any item.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a seal for recognizing validity by the method of the present invention.

FIG. 2 is an illustrative view showing a photographing original plate used for producing a sheet for validity recognition;

FIG. 3 is a table showing an example of encoding of numbers recorded on a sheet.

FIG. 4 is an illustrative view showing an optical system for producing a Fourier transform hologram;

FIG. 5 is an illustrative view showing an optical system for producing a lensless Fourier transform hologram;

FIGS. 6A to 6G are illustrative views showing steps of producing an embossed hologram using a Fourier transform hologram as an original plate.

FIG. 7 is a perspective view showing an example of a recognition device used in the method of the present invention.

8A is a schematic plan view of the recognition device shown in FIG. 7, and FIG. 8B is a schematic front view thereof.

FIG. 9 is an illustrative view showing another example of the seal of the present invention;

[Explanation of symbols]

REFERENCE SIGNS LIST 10 seal 20 sheet on which image formed by Fourier transform hologram 22 imaging original plate 60 original plate 78 embossed hologram seal 100 recognition device 102 case 104 laser light emitting device 106 diverging lens 108 opening 110 screen 112 battery 114 switch

Claims (7)

[Claims] 1. A validity recognition method using a seal formed with an image of a coded information by a Fourier transform hologram, and a recognition device for reading the image formed on the seal, wherein the recognition device comprises: The seal is irradiated with a laser beam on the surface on which the image is formed of the seal, and the legitimacy is recognized by reproducing the image on the screen of the recognition device by the laser beam reflected on the surface on which the image is formed,
A validity recognition method. 2. A recognition device for recognizing an image of a coded information by a Fourier transform hologram, comprising: a case; a laser light emitting device attached to the case; and a laser beam emitted by the laser light emitting device. A recognizing device, comprising: a screen mounted in a reflection direction of the laser light to receive the light reflected on the image forming surface. 3. The recognition device according to claim 2, wherein the laser beam is applied perpendicular to the hologram forming surface. 4. The recognition device according to claim 2, wherein an opening is formed in the case in the vicinity of the laser beam reflecting portion. 5. The recognition device according to claim 2, wherein an adjustment lens for adjusting the diffusivity of the laser light is attached to the laser light emitting device. 6. The screen has a transmissive diffusion property,
The recognition device according to any one of claims 2 to 5, wherein the recognition device has irregularities on its surface. 7. The recognition device according to claim 2, further comprising a timer device for turning off the power of the laser light emitting device after a predetermined time.