JP2009149068A - Anti-counterfeit printed matter and verification method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anti-counterfeit printed matter which permits simple and reliable operation for performing determination of authenticity without allowing information to be easily read or altered by visible light and IR rays from printed code marks or the like and permits mechanical reading, and a verification method using the same. <P>SOLUTION: There are provided the anti-counterfeit printed matter characterized in that a reflective substrate of ≥70% in reflectivity in visible rays and near IR rays of 400 to 1,400 nm is provided thereon with at least three kinds of black printing inks of visibly the same color, and different in absorption characteristics of rays from a long wavelength region of visible rays of 400 to 780 nm to a near IR wavelength region of 780 to 1,400 nm like patterns of printed images for verification and that there are portions respectively not superposing on each other, and the verification method using the same. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a machine-readable anti-counterfeit printed matter and a verification method using the same. More specifically, the present invention relates to an anti-counterfeit printed material having a mark that can be read by an image composed of reflected light in the long wavelength region of visible light to an infrared region. In particular, the print information includes three types of black that appear to be the same visually. The present invention relates to an anti-counterfeit printed matter that is composed of ink and has different absorption characteristics from a long wavelength region of visible light to an infrared region, and a verification method using the same.

  Traditionally, machine-readable code marks such as bar codes and OCR characters are often provided as means for reading information on securities such as stock certificates, bonds, checks, gift certificates, lottery tickets, and commuter passes. The code mark is usually formed using an ink (black printing ink) containing carbon black or the like that absorbs light in the near infrared region on the base material surface that reflects light in the near infrared region.

  In the above method, utilizing the infrared reflectivity and infrared absorptivity of the white ink and the black ink, mechanically readable information is applied to the medium as a barcode pattern mark, and infrared rays are applied to the medium. The recorded information is read by irradiating, scanning the mark, and measuring the intensity of the reflected infrared light. At this time, visible light is blocked so that information is not read illegally, and a concealing layer that transmits infrared rays is formed to prevent information from being easily read by visible light.

  However, the printed matter in which the information is formed with the above-described ink and the infrared ray is absorbed by the information portion is easy to obtain the ink and uses various infrared rays in a wide wavelength range in the infrared region. Although there is an advantage that it can be easily detected, the advantage is adversely affected and has a drawback that it is easy to read. That is, it can be easily read by an infrared information reader such as an infrared camera, and the presence of concealment information such as a code mark is determined. For this reason, forgery is performed based on information read by an infrared camera, and tampering may be performed by joining or pasting light-absorbing parts based on the reading result. There is a problem.

In order to prevent forgery and tampering by determining the presence of concealment information, it is proposed to solve the above problems by printing code marks etc. using three types of black printing inks with different spectral characteristics from each other However, in this case, the image printed with black printing ink is captured on one monochrome screen using two or more types of light sources or filters, and the authenticity is determined by reading each of the images. It will be. Similarly, by providing images with three types of black printing inks with different spectral absorption characteristics, the anti-counterfeiting effect can be further improved. In this case as well, each of the images captured on one screen is read. The authenticity determination must be performed, and there remains a problem that the operation for determining the authenticity becomes very difficult.
JP 2000-309736 A JP 2005-246719 A JP 2007-030448 A JP 2007-136983 A JP 2007-223285 A

  Solving the problems of the prior art as described above, that is, easy and reliable operations for determining authenticity without easily reading information from a printed code mark or the like with visible light or infrared light Therefore, it is a problem to provide a machine-readable forgery prevention printed material and a verification method using the same.

  According to the first aspect of the present invention, on a reflective base material having a reflectance of 70% in visible light and near infrared rays of 400 to 1400 nm, the long wavelength of visible light having the same color and 400 nm to 780 nm is visually observed. That at least three kinds of black printing inks having different absorption characteristics of light in the near infrared wavelength region of 780 to 1400 nm from the region are provided in the pattern of the verification image, and that there are at least portions that do not overlap each other. It is a forgery-proof printed matter.

  Invention of Claim 2 has a wavelength range which can read both two types of black inks simultaneously in the visible light wavelength range or infrared wavelength range of 400-1400 nm among the three types of black ink, The machine-readable anti-counterfeit printed matter according to claim 1, wherein a pattern is provided so that the two types of printed images can be seen as a group of images by the configuration based on the reflection intensity.

  The invention described in claim 3 is the absorption of the black printing ink that irradiates the printed surface of the anti-counterfeit printed matter described in claim 1 or 2 and constitutes each verification print image. By means of an information reader, the reflection state of near infrared rays from the long wavelength side of visible light is reflected by two band pass filters that transmit different wavelength ranges and band pass filters that transmit the same wavelength range of absorption characteristics. After each color reading, color information was added to each reflection image information obtained by reading, and then they were combined into a color image, based on which the contents of the verification print image could be verified. This is a feature of a verification method for anti-counterfeit printed matter.

  In the invention according to claim 4, light on the printing surface of the anti-counterfeit printed matter according to claim 1 or 2 and light in the same wavelength range of the absorption characteristics of the black printing ink constituting each verification print image and absorption A process of irradiating light of two wavelength regions having different characteristics and then reading the reflection state by an information reading device is performed on each verification print image, and each reflection image information obtained by reading is colored. This is a method for verifying forgery-preventing printed matter, characterized in that after adding information, they are combined into a color image, and the contents of the print image can be verified based on the color image.

  Since this invention is the above structure, there exist the following effects.

  Since the anti-counterfeit printed matter of the present invention is provided with verification print images such as characters and codes using three kinds of black printing inks having different absorption characteristics in the near-infrared region from the long wavelength side in the visible light region. , Visually the same color is indistinguishable. Such a forgery-preventing printed matter can display the reflected image information corresponding to the verification image as a single color image by the verification method of the present invention, so that the content of the verification print image is based on that. Verification can be performed easily and accurately, and authenticity determination can be used effectively in an instant.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view showing one embodiment of a forgery-preventing printed material according to the present invention. FIG. 2 is an explanatory diagram showing a schematic cross-sectional configuration of the anti-counterfeit printed matter 1 in FIG. FIG. 3 is a basic explanatory diagram for extracting an infrared reflection image corresponding to a verification print image in an anti-counterfeit print, and FIGS. 4 and 5 correspond to the verification print image in the anti-counterfeit print in FIG. It is explanatory drawing which shows a mode when extracting three types of reflected images to perform at once. 6 is an explanatory diagram when a video based on each reflection image information obtained from the forgery-preventing printed matter is displayed on the monitor screen, and FIG. 7 shows how the video extracted in FIG. 6 is synthesized. It is explanatory drawing showing. Further, FIG. 8 is a graph for explaining the spectral characteristics and the wavelength range to be verified of the portion printed with the three types of black printing ink in the information printed matter of FIG.

  The anti-counterfeit printed matter 1 shown in FIG. 1 is arranged on the outermost surface in a state where the pattern image 11 and the verification images 13, 14, and 15 printed in black are visually visible. As shown in FIG. 2, on the reflective base material 12, the absorption characteristics in the near-infrared region differ from the long-wavelength side in the visible region, and are printed with black printing ink that looks visually the same color. Print images 13, 14, and 15 are formed.

  Each of the verification print images 13, 14, 15 has a different spectral characteristic from the long wavelength side of the visible light region to the infrared region, and is printed with black printing ink that looks visually the same color. More specific examples include black printing ink 13 that absorbs visible light from the near infrared region, black printing ink 14 that absorbs visible light and does not absorb the near infrared region, and from the long wavelength side of the visible light region. Each verification print image 13, 14, 15 is formed by three kinds of black printing inks of black printing ink 15 that does not absorb the near infrared region.

  In the present invention, the reflective substrate 12 is a substrate having a property of reflecting near infrared rays from at least the long wavelength side of the visible light region. In particular, it is preferable that each of the verification print images 13, 14, 15 has a considerably higher reflectance than the reflectance in the near infrared region from the long wavelength side in the visible light region.

  The wavelength of visible light generally refers to light that can be seen by humans, and the boundary between wavelengths varies slightly depending on the literature, but often refers to 380 to 780 nm, and the near infrared wavelength is 780 to 2.5 μm. Often refers to a nearby range. In the present invention, the long wavelength side of the visible light region specifically refers to a wavelength region longer than 600 nm. In general, the most commonly used black printing ink uses carbon black and exhibits high absorption from visible light to near infrared. Other black inks usually have high absorptivity in the entire wavelength region of visible light in order to appear black visually. Since the anti-counterfeit printed matter 1 of the present invention uses a black printing ink that does not absorb on the long wavelength side in the visible light region, even if it is assumed that it is a normal black ink, the difference in performance can be achieved. It is difficult to imitate in the same way, so counterfeiting is difficult.

  FIG. 3 shows a conceptual diagram of a basic example of extraction of infrared reflection image information. The light source 31 emits light in the near infrared region from the visible region, blocks only visible light by the visible light region cut filter 32, transmits near infrared light, and receives only near infrared light by the information reading device 33. Then, the received image information is displayed on the monitor 34 to obtain an infrared image.

  FIG. 4 is an explanatory diagram of an example in which reflected image information corresponding to the verification print image in the forgery-preventing printed matter shown in FIG. 1 is extracted. In extracting the reflected image information, first, the reflection characteristics of the light irradiated from the light source 31 onto the printing surface of the anti-counterfeit printed matter 1 are set to the same wavelength as the absorption characteristics of the three types of black printing ink constituting each verification print image. Information is read from the visible light by the information reading devices 41, 42, and 43 in the infrared region through the band-pass filter 51 that transmits the region and the band-pass filters 52 and 53 that transmit the wavelength regions having different absorption characteristics.

  Specifically, a 30R / 70T beam splitter that irradiates the anti-counterfeit printed matter 1 from the light source 31 with light having a wavelength of visible to near-infrared, and first reflects 30% of the reflected light and transmits 70%. The reflected light is guided to the camera 41 side, and the transmitted light is guided to the beam splitter 55 side. Next, 50% of the light transmitted through the beam splitter 54 is reflected and guided to the 50R / 50T beam splitter 55 that transmits 50%. The light transmitted therethrough is directed to the information reading device 43 side, and the reflected light is read from the information. Dividing into three so as to be guided to the device 42 side. And the band-pass filter 51 which permeate | transmits the wavelength range with the same absorption characteristic of each verification print image which comprises each verification print image through the light divided | segmented into each, and the band pass filter which transmits the wavelength range from which an absorption characteristic differs Reading is performed by the reading devices 41, 42, and 43 through 52 and 53, and reflection image information is extracted.

  FIG. 6 is an explanatory diagram in which an image based on each reflection image information obtained from the forgery prevention printed matter is displayed on the monitor screen. This shows a situation when the extracted reflection image information is displayed on the monitors of the information reading devices 41, 42, and 43.

  FIG. 5 shows an example in which the reflection image information of the anti-counterfeit printed matter 1 of the present invention is extracted by a method other than the above-described example. In the method shown here, in extracting the reflected image information, first, light in a wavelength region having different absorption characteristics of the black printing ink constituting each verification print image is emitted on the printing surface of the anti-counterfeit printed matter 1 2. The process of irradiating from one light source and one light source that emits light in the same wavelength region of absorption characteristics, and then reading the reflected state by the information reading device 33 and extracting reflected image information for each verification print image And each reflection image information is extracted.

  More specifically, first, the anti-counterfeit printed matter 1 is irradiated with a light source 35 that emits light having the same wavelength region of the absorption characteristics of the three types of black printing ink constituting the verification print image, and then the reflection state is visible. The reflected image information is extracted by reading by the information reading device 33 through the visible light cut filter 32 that cuts a wavelength shorter than the long wavelength side of the light region, for example, a wavelength of 600 nm or less. Subsequently, the light source 36 that emits light having different absorption characteristics of the black printing ink constituting the verification print image 15 is irradiated, and then the reflection state is reflected by the information reading device 33 via the visible light region cut filter 32. Read and reflect image information is extracted. Finally, a light source 37 that emits another wavelength having a different absorption characteristic of the black printing ink constituting the verification print image, which is different from the light source 36, is irradiated, and the reflection state is then cut into a visible light region cut filter. The information is read by the information reading device 33 via 32 and the reflection image information is extracted.

  FIG. 6 shows the situation when each reflection image information extracted in this way is displayed on the monitor of the infrared information reading device 34.

  With the above method, similar to the method shown in FIG. 3, it is possible to view an image based on the reflection image information of the verification print image made of each black printing ink.

  When the reflection image information of the verification print image printed in the anti-counterfeit printed material 1 is extracted as described above, color information is added to the reflection image information and then combined to obtain a color image. The presence and content of a verification print image that cannot be visually discriminated is verified based on the above, and the printed matter is discriminated.

FIG. 7 is a conceptual diagram showing how color information is added to each extracted reflection image information and the composition of the color image. A color reduction method is used to synthesize a color image in the same manner as when printing ink is multiplied. By looking at the monitor screen 7 on which the color image that has been visualized in this way and colored and synthesized is displayed, each verification print image made of three types of black printing ink can be distinguished and synthesized. It is possible to determine the authenticity of a printed matter simply by looking at a color image.

  FIG. 8 is a graph showing an example of the relationship between reflectance and wavelength for each black printing ink. The reflectance of each ink is measured when a verification print image made of black printing ink formed on a base material that reflects from a long wavelength region to an infrared region of visible light is measured. As shown in FIG. 8, each black printing ink has its absorption characteristics 61, 62, and 63 in a wavelength region that does not clearly overlap with the absorption characteristics of each black ink, from the long wavelength side of the visible light region to the near infrared. Has to have in the area. For example, when the reflected image shown in FIG. 4 is extracted using this ink, the bandpass filters 52, 53, and 54 use filters that transmit light having wavelengths near 71, 72, and 73 in FIG. When extracting the reflection image shown in FIG. 5, the emission wavelength of the light sources 35, 36, and 37 is set to the vicinity of 71, 72, and 73 in FIG. It will be easy and accurate.

  Specific examples of the present invention will be described below.

After printing a design using the following process ink on a high-quality paper as a reflective substrate by an offset printing method, a print image for verification was printed using the first black ink. Another verification image is printed with the second black printing ink having a wavelength region having a different absorption characteristic from that of the first black printing ink. Further, the first black printing ink and the second black printing ink are absorbed. Printing was performed with a third black printing ink having wavelength regions having different characteristics, and a machine-readable anti-counterfeit printed matter was obtained.
[Process ink]
UV161 Crimson S (manufactured by T & K TOKA)
UV161 yellow S (manufactured by T & K TOKA)
[First black printing ink]
UV161 ink S (manufactured by T & K TOKA)
[Second black printing ink]
Kai UV HR FL concrete ink (made by T & K TOKA)
[Third black printing ink]
Perylene black pigment 15 parts UV161 85 parts medium S (manufactured by T & K TOKA)

  Next, the anti-counterfeit printed matter is irradiated with light from an incandescent lamp, the reflected light is reflected by 30%, and divided by a beam splitter that transmits 70%, and further, the transmitted light is reflected by 50% and transmitted by 50%. The reflected light was divided into three by dividing into two with a beam splitter. And the narrow band interference filter (band pass filter) which transmits the light of the same wavelength region of the absorption characteristic of each black printing ink to the divided reflected light, and the wavelength region of the different absorption characteristic of each black printing ink Image information was extracted by three CCD cameras each through a narrowband interference filter (bandpass filter) that transmits light. A CCD camera without an infrared cut filter was used. Red, yellow, and blue color information was added to each of the three reflected image information extracted in this manner, and a color image was synthesized based on the color subtraction method and displayed on the monitor screen.

  When looking at the anti-counterfeit printed matter, the surface pattern and the black printing ink were visually observed, but in order to synthesize and display another color image based on the verification print image information extracted according to the determination method, In addition to shading, color differences were added, and it was possible to accurately determine authenticity even for printed matter having a complicated verification print image.

  The counterfeit prevention printed matter of Example 1 is sequentially irradiated with LEDs that emit the same 600 nm absorption characteristics of the black printing ink constituting the verification print image, and LEDs that emit light in the wavelength regions 700 nm and 800 nm having different absorption characteristics. The reflected light was photographed with the CCD camera through a low-pass filter that cuts off 600 nm or less. Red, yellow, and blue color information is added to each reflected image information obtained by such shooting, color reproduction based on a color subtraction method is performed, and the resultant image is combined into a single color image. Was displayed.

  When the anti-counterfeit printed matter made in Example 1 was seen, a black ink that was indistinguishable from the surface pattern was visually observed. However, according to the discrimination methods in Examples 2 and 3, the black ink was extracted from the black printing ink. Since the color image is synthesized and displayed based on the reflected image information, the authenticity determination can be performed accurately in a moment even for a printed matter having a complicated verification print image.

It is a top view which shows one Embodiment of the forgery prevention printed matter of this invention. It is a cross-sectional schematic diagram in the X-X 'line | wire of the forgery prevention printed matter of FIG. It is the top view which observed one Embodiment of the machine-readable information printed matter of FIG. 1 with the infrared camera of the long wavelength side. It is explanatory drawing which shows a mode when the reflective image information corresponding to the printing image for verification in the forgery prevention printed matter shown in FIG. 1 is extracted. It is explanatory drawing which shows the other mode when the reflective image information corresponding to the verification print image in the forgery prevention printed matter shown in FIG. 1 is extracted. It is explanatory drawing which displays the image | video based on each reflection image information obtained from the forgery prevention printed matter on the monitor screen. It is explanatory drawing which shows the mode of addition of the color information to each extracted reflected image information, and composition of a color image. It is a graph which shows the relationship between the reflectance of a printed matter using three types of black printing ink in one Embodiment of the machine-readable information printed matter of this invention, and a wavelength.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anti-counterfeit printed matter 4, 5, 6 Monitor screen 7 on which a print image for verification is projected 7 Monitor screen on which a color image is projected 11 Graph showing spectral characteristics of black printing ink 11 Pattern image 12 Reflective substrate 13 First Black printing ink 14 Second black printing ink 15 Third black printing ink 31 Light source 32 Visible light cut filter 33, 41, 42, 43 Camera 34 Monitor 35, 36, 37 Light source 41, 42, 43 Information reading device 51, 52, 53 Band pass filter 54 30R / 70T beam splitter 55 50R / 50T beam splitter 61, 62, 63 Each absorption characteristic 71, 72, 73 of black printing ink Example of information reading wavelength

Claims (4)

  Near-infrared light of 780 to 1400 nm from the long wavelength region of visible light of 400 nm to 780 nm on a reflective base material having a reflectance of 70% or more in visible light of 400 to 1400 nm and near infrared light. An anti-counterfeit printed matter characterized in that at least three types of black printing inks having different absorption characteristics of light in the wavelength region are provided in a pattern of a verification image, and at least portions that do not overlap each other.   Among the three types of black ink, there is a wavelength range in which both of the two types of black ink can be read simultaneously in the visible light wavelength range or infrared wavelength range of 400 to 1400 nm, and by the configuration from the reflection intensity in the wavelength range, The machine-readable anti-counterfeit printed matter according to claim 1, wherein a pattern is provided so that the two types of printed images can be seen as a group of images.   Irradiating the printing surface of the anti-counterfeit printed matter according to claim 1 or 2, the reflection state of light in the near-infrared region from the long-wavelength side region of visible light, the black printing ink constituting each verification print image, Information reading device that reflects the near-infrared reflection state from the long wavelength side of visible light through two bandpass filters that transmit different wavelength ranges of absorption characteristics and a bandpass filter that transmits the same wavelength range of absorption characteristics After that, color information is added to each reflection image information obtained by reading each other, and then they are combined into a color image so that the contents of the verification print image can be verified based on it. A forgery-proof printed material verification method characterized by the above.   The printing surface of the anti-counterfeit printed matter according to claim 1 or 2, wherein the black printing ink constituting each verification print image has light having the same wavelength range of absorption characteristics and two wavelength areas having different absorption characteristics. A process of irradiating light and then reading the reflected state by an information reading device is performed on each verification print image, and color information is added to each reflected image information obtained by reading, A method for verifying forgery-preventing printed matter, characterized in that a color image is synthesized and the content of the print image can be verified based on the color image.

Images