JP2003048390A - Information recording medium and forgery preventing method for certified information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording medium, the information which can be read out without employing a special device and which is hard to be forged and altered. SOLUTION: The size of a plurality of minute through holes 10 provided on a sheet-like matter 12 as a recording medium is made to be a size too minute to see with naked eye. The through holes are so arranged as to reflect the predetermined information when the sheet-like matter is seen by the light passing through the through holes from the other side of the sheet-like matter when a ray of light incidents upon one side of the sheet-like matter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium and a method for preventing forgery of authentication information, and more particularly to recording or recording a photograph, fingerprint, mark or other information for authenticating an individual or a specific organization. It relates to a method for preventing forgery of authentication information by using the information provided.

[0002]

2. Description of the Related Art As information for authenticating an individual or a specific organization, for example, a photograph of a passport or a driver's license, a hologram provided on a credit card, etc. are well known. If such information is forged or tampered with, it may cause illegal use or crime, so various measures have been taken to prevent it from being forged or tampered with. One method is a method of embossing to give an uneven shape in a state where a photograph or the like is attached to a mount, and another method is to print the photograph on the mount itself. Further, there is also a method in which the encrypted information is written in an IC chip and the IC chip is embedded in a substrate such as a card.

[0003]

However, in the case of photographs and the like, it is possible to peel off only the surface layer of the photographs and replace the counterfeit photographs. Further, in the case of an IC chip, it is difficult to forge, but there is a problem that a special reading device for reading the information written from the IC chip is required at each authentication location.

Therefore, an object of the present invention is to provide an information recording medium which does not require a special device for reading information, is hard to be forged or tampered with, and an authentication information forgery prevention method which can effectively prevent forgery. To do.

[0005]

In order to achieve the above object, according to the present invention, the size of a plurality of through holes provided in a sheet-like object is set to a size that is invisible to the naked eye, and one surface of the sheet-like object is When the light is incident from the through holes, the through holes are arranged so that predetermined information is projected when viewed from the other surface of the sheet-like object by the light passing through the through holes.

That is, according to the present invention, in an information recording medium in which a sheet-like object is provided with a through hole to record predetermined information, the size of the through hole is set to a size that is not visible.
When light is incident from one surface of the sheet-like object, the through holes are arranged so that predetermined information is projected by the light passing through the through-hole when viewed from the other surface of the sheet-like object. An information recording medium is provided which is characterized in that

With this configuration, the presence of information is not recognized when viewed with the naked eye, but when light is incident from one surface of the sheet-like object, predetermined information is displayed on the other surface, and information recording for authentication is performed. It is effective as a medium.

Further, according to the present invention, the through hole can be formed at a predetermined angle so as not to be perpendicular to the surface of the sheet-like object.

With this configuration, information can be read only when the sheet-like object is arranged at a predetermined angle with respect to the light source or the bright direction.

According to the present invention, the first information as the predetermined information is recorded by providing the first information at the predetermined angle with respect to the sheet-like object in the through hole, and
The second information can be recorded by providing the through-hole at an angle different from the predetermined angle with respect to the sheet-like object.

With this configuration, it is possible to record two different types of information on the same two-dimensional plane. Further, by changing the angle of the through hole variously, it becomes possible to simultaneously record a plurality of pieces of information of three or more kinds.

According to the present invention, the first information and the second information are two image information obtained when the same image is viewed by the left and right eyes of a person, respectively, and the sheet-like object is obtained. It can be configured such that when is placed at a close distance from the eyes, the two images are displayed at the same time to reproduce a stereoscopic image.

With this configuration, it is possible to display a three-dimensional image that is lifted up from the recording medium, and thus it is possible to counterfeit
Tampering becomes more difficult and authentication becomes easier.

Further, according to the present invention, it is possible to record visible information that can identify an individual or a specific tissue on the sheet-like object. Further, as the visible information, a photograph, a face image, a signature, a fingerprint, a voiceprint,
Any one or more of a bar code, a logo, and a symbol mark can be recorded.

With this configuration, it is possible to easily specify a person and an organization such as a group or a company to which the person belongs.

According to the invention, the sheet-like object is
When it is paper, CO ₂Laser beam, Y
With either AG laser beam or femtosecond laser
Can be formed.

With this configuration, it is possible to provide the paper with fine through holes that cannot be visually observed.

Further, according to the present invention, when the sheet-like object is a synthetic resin, the through hole can be formed by any one of a YAG laser beam third harmonic wave, a YAG laser beam fourth harmonic wave, and an excimer laser. .

With this structure, it is possible to provide fine through holes that cannot be visually observed in the synthetic resin.

Further, according to the present invention, when the sheet-like object is a metal, the through holes can be formed by fine hole electric discharge machining.

With this structure, it is possible to provide fine through holes that are invisible to the metal.

Further, according to the present invention, when a sheet-like object having information for identifying an individual or a specific tissue is attached to a mount, a through hole is provided across the sheet-like object and the mount to provide the sheet. In a method for preventing forgery of authentication information for preventing a striped object from being replaced with a counterfeit product, the size of the through hole is made invisible, and when light is incident from the back surface of the mount, the through hole is transmitted. A method for preventing forgery of authentication information, characterized in that the through holes are arranged so that predetermined information is projected when viewed from the front side of the sheet-like object and the front side of the mount by light. .

With this configuration, when a sheet-like object on which authentication information such as a photograph is recorded is peeled from the mount and forged or tampered with, the sheet-like object after forgery or tampering is
Since there is no through-hole continuously provided over the mount, it is not possible to display the proper information, and it is easily found that the product is a forgery / tampering product.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged plan view showing a part of a through hole in the first embodiment of the information recording medium according to the present invention.

The present invention is an information recording medium for recording information on a sheet-like object made of paper, synthetic resin, metal or the like. Fine through holes are formed in these relatively thin sheet-like objects by the method described later. It is provided to record information such as images and characters. In FIG. 1, a state in which a plurality of fine through holes 10 are provided is shown. The diameter of the fine through holes 10 is 20 μm, and the pitch with the adjacent through holes is 70.
μm. The enlarged view shown in FIG.
This is a magnified image of 0 times, and when the size of the image to be recorded is 1 mm × 0.8 mm as shown in FIG. 3, it shows a part (about 1/15) of the area. That is, one image has hundreds to thousands of minute through holes 10
Is formed by. In addition, in the present invention, the fine through-holes 10 having an invisible size are holes having a diameter of about 10 to 20 μm. This is because the resolution of the human eye is 50 to 100 μm, so that the presence of the fine through holes 10 cannot be visually confirmed by setting the diameter sufficiently smaller than this.

FIG. 2 is a plan view showing an example in which the image shown in FIG. 3 is provided on the card-type membership card. The card-type membership card is formed as a card 12 which is a sheet-like object made of synthetic resin, for example, and a minute through hole 10 is provided in a part thereof to form an information recording portion 14. In the information recording portion 14, for example, an image of the face of the member as shown in FIG. 3 can be recorded. In addition to the face image, one or more of a photograph, a signature, a fingerprint, a voiceprint, a barcode, a logo, and a symbol mark can be recorded.

FIG. 4 is a sectional view of a part of the information recording portion 14 in the card 12 of the first embodiment shown in FIG. In this example, the fine through holes 10 are provided perpendicularly to the plane of the card 12 which is a sheet-like object. Therefore, when one of the planes of the card 12, that is, the back surface or the front surface of the card 12, is directed to the light source or the bright direction, the light passes through the minute through holes 10 and is emitted from the opposite side. Is projected as a collection of dots of light,
This can be visually observed. The fine through holes 10
Although it is invisible to the naked eye itself, it is possible to see the transmitted light after the light passes through the minute through holes 10.
This is because the diameter increases due to diffraction or the like.

When the card 12 is paper, the fine through-holes 10 have CO ₂ laser beam, YAG laser beam,
It can be formed by irradiating with either femtosecond laser. When the card 12 is made of synthetic resin, the minute through holes 10 can be formed by any one of the YAG laser beam triple wave, the YAG laser beam fourth wave, and the excimer laser. Further, when the card 12 is made of metal, the fine through holes 10 can be formed by fine hole electric discharge machining (also referred to as micro electric discharge machining). The fine hole electrical discharge machining is a process in which a pulse discharge is repeatedly generated between a work (card 12 in this case) arranged in a machining fluid and an electrode, and machining is performed in a cycle of discharge → melting → vaporization → scattering. With micro hole electrical discharge machining, it is possible to machine about 1000 holes in 1 second.
Information constituted by about 0 to 8000 minute through holes 10 can be recorded in about 7 to 8 seconds.

The example shown in FIG. 5 is a second embodiment of the information recording medium of the present invention, in which the fine through-holes 10 are not perpendicular to the plane of the card 12 but the perpendicular line V of the card 12.
Is provided with an inclination angle α. With this configuration, the plane of the card 12, that is, the card 12
Even if you point the back or front of the light source or bright direction,
It is not possible to easily recognize the light transmitted through the minute through holes 10 and emitted from the opposite side. That is, the transmitted light is incident on the eye only when the card 12 is tilted according to the tilt angle of the minute through hole 10 and directed toward the light source or the bright direction. Therefore, a person who knows this inclination angle in advance can quickly set the inclination angle and orient the card 12 toward the light source or the bright direction, but if this is not known, it will be a trial and error process.

FIG. 6 shows, as a third embodiment of the information recording medium of the present invention, a card 12 in which two different information are recorded by fine through holes 10A and 10B having two kinds of inclination angles.
FIG. The fine through holes 10A are inclined with respect to the perpendicular V of the card 12 by an angle α, while the fine through holes 10A are
B is inclined with respect to the vertical line V by an angle β. In this way, two kinds of inclination angles can be set, and the first information can be recorded in the plurality of fine through holes 10A, and the second information can be recorded in the plurality of fine through holes 10B. As the first and second information,
Different images may be used, or images and text information may be combined. When the card 12 configured as described above is tilted according to the inclination angle α of the minute through hole 10A and directed toward the light source or the bright direction, the first information is displayed, while the minute penetration is performed. According to the inclination angle β of the hole 10B,
When the card 12 is tilted and directed toward the light source or the bright direction, the second information is displayed.

FIG. 7 is a sectional view of a card 12 which is a modification of the third embodiment of FIG. 6 as a fourth embodiment of the information recording medium of the present invention. The fourth embodiment of FIG. 7 is
It is common to the third embodiment of FIG. 6 in that two kinds of fine through holes 10A and 10B having different inclination angles are provided. However, the two inclination angles in the fourth embodiment are set to about +8 degrees and about -8 degrees with respect to the perpendicular line V, respectively. Further, as the two pieces of information to be recorded, two plane images obtained from the same stereoscopic image are used. That is, two plane image data obtained by capturing a stereoscopic image are recorded on the card 12 at different inclination angles according to the distance between the left and right eyes of a person. By recording in this way, when the card 12 is placed at a close distance of several tens of centimeters (for example, 30 centimeters to 80 centimeters) from the eyes, two images are displayed at the same time and a stereoscopic image is displayed. Play it back.

In the third and fourth embodiments shown in FIGS. 6 and 7, two pieces of information are recorded on the card 12,
By changing the inclination angle of the fine through-hole 10 sequentially,
It is possible to record three or more types of information at the same location.
With this configuration, it is possible to record a plurality of images, character strings, barcodes, etc. at the same location.

FIG. 8 is a plan view of a membership card showing an example showing one mode of using the information recording medium of the present invention. In this example, a photograph 18 attached to the mount 16 of the membership card and an information recording portion 20 are provided across the mount 16. As the information recording portion 20, one or a plurality of pieces of information as described in each of the above embodiments can be recorded. When the photo 18 is peeled off and replaced with another photo, a part of the information recording portion 20, that is, the photo 18
Even if the information recording portion 20 provided in the photo disappears or the replaced photograph has fine holes,
Since the information recording portion 20 provided on the mount 16 is not continuous with the information recording portion 20, forgery or falsification can be easily confirmed.

In each of the above embodiments, the case where the present invention is applied to a membership card has been described, but the present invention is not limited to this, and a driver's license for a vehicle, a passport, an identification card, a credit card, a bank account card, Easily for many items that are inconvenient if counterfeited or tampered with, such as admission certificates, library book lending cards, hospital consultation tickets, various prepaid cards and other securities, checks, bills, banknotes, stamps, stamps, etc. It can be applied.

Further, according to the present invention, it has been explained that a plurality of different information can be recorded at the same place in a superposed manner. However, the color components of a color image are decomposed and the three primary colors of light (RG) are separated.
It is also possible to display a color image by forming three types of image patterns in accordance with B) and arranging light sources for the three primary colors at predetermined positions during projection.

[0036]

As described above, according to the present invention, the size of the plurality of fine through-holes 10 provided in the sheet-like object is made so small that it cannot be visually observed, and one surface of the sheet-like object is When the light is incident from the through holes, the through holes are arranged so that predetermined information is projected when viewed from the other surface of the sheet-like object by the light passing through the through holes, so that the presence of information is not visible when viewed with the naked eye. Although not recognized, when light is incident from one surface of the sheet-like object, predetermined information is projected on the other surface, which is effective as an information recording medium for authentication.

Further, according to the present invention, since the authentication information forgery prevention method using the above information recording medium is provided, the sheet-like object on which the authentication information such as a photograph is recorded is peeled from the mount and forgery or falsification is performed. In this case, since the sheet-like object after forgery or falsification does not have a through hole continuously provided over the mount, it is not possible to project the legitimate information, and it is easily a forgery / falsification product. It turns out.

[Brief description of drawings]

FIG. 1 is an enlarged plan view showing a part of a through hole in a first embodiment of an information recording medium according to the present invention.

FIG. 2 is a plan view showing an example in which an image as shown in FIG. 3 is provided on a card-type membership card.

FIG. 3 is a diagram showing an example of an image displayed by a through hole shown in FIG.

FIG. 4 is a sectional view of a part of an information recording portion in the card according to the first embodiment of FIG.

FIG. 5 is a partial sectional view of a second embodiment of the information recording medium of the present invention.

FIG. 6 is a sectional view of a card in which two different pieces of information are recorded by fine through holes having two kinds of inclination angles as a third embodiment of the information recording medium of the present invention.

FIG. 7 is a partial sectional view of a fourth embodiment of an information recording medium of the present invention.

FIG. 8 is a plan view of a membership card showing an example showing one mode of using the information recording medium of the present invention.

[Explanation of symbols]

10, 10A, 10B Fine through holes 12 cards (sheet-like objects as information recording media) 14, 20 Information recording part 16 mount 18 pictures

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ken Masaki             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 2C005 HA02 HB02 HB03 HB04 HB07                       HB08 HB10

Claims (10)

[Claims] 1. An information recording medium in which through-holes are provided in a sheet-like object to record predetermined information, and the size of the through-hole is made invisible, and light is incident from one surface of the sheet-like object. In this case, the information recording medium is characterized in that the through holes are arranged so that predetermined information is projected when viewed from the other surface of the sheet-like object by the light passing through the through holes. 2. The information recording medium according to claim 1, wherein the through hole is formed at a predetermined angle with respect to a surface of the sheet-like object other than a direction perpendicular thereto. 3. The first information as the predetermined information is recorded by being provided at a predetermined angle with respect to the sheet-like object in the through hole, and the second information is recorded in the sheet-like object in the through hole. The information recording medium according to claim 1, wherein the information recording medium is recorded by being provided at an angle different from the predetermined angle with respect to the object. 4. The image obtained by viewing the same image with the first information and the second information with the left and right eyes of a person, respectively.
4. The image information, which is one image information, and is configured such that when the sheet-like object is placed at a close distance from the eyes, the two images are displayed at the same time to reproduce a stereoscopic image. Information recording medium. 5. The sheet-like object is recorded with visible information capable of identifying an individual or a specific tissue, and any one of claims 1 to 4 is characterized.
Information recording medium described in 1. 6. The visible information includes a photograph, a face image,
The information recording medium according to claim 5, which is one or more of a signature, a fingerprint, a voiceprint, a bar code, a logo, and a symbol mark. 7. The sheet-like object is paper, and the through hole is formed by any one of a CO ₂ laser beam, a YAG laser beam, and a femtosecond laser. The information recording medium as described in any one. 8. The sheet-shaped object is made of synthetic resin, and the through hole is formed by any one of a YAG laser beam triple wave, a YAG laser beam fourth wave, and an excimer laser. The information recording medium described in any one of 1 to 6. 9. The information recording medium according to claim 1, wherein the sheet-like object is made of metal, and the through holes are formed by fine hole electric discharge machining. 10. When a sheet-shaped object having information for identifying an individual or a specific tissue is attached to a mount, a through-hole is provided over the sheet-shaped object and the mount to make the sheet-shaped object a counterfeit product. In the method for preventing forgery of authentication information for preventing the replacement of the sheet-like shape, the size of the through-hole is made invisible, and when light is incident from the back surface of the mount, the sheet-like shape is formed by light passing through the through-hole. A method for preventing forgery of authentication information, wherein the through holes are arranged so that predetermined information is projected when viewed from the front side of the object and the front side of the mount.