JP4706459B2 - Anti-counterfeit printed matter and method for distinguishing anti-counterfeit printed matter - Google Patents

Description

  The present invention relates to an anti-counterfeit printed matter in which each verification image formed by the infrared absorbing ink and the infrared light emitting fluorescent ink is hidden in an invisible state, and each verification hidden in such a printed matter. The present invention relates to a method for discriminating a false image-preventing printed matter in which reflected image information corresponding to an image for use is read by an infrared information reading device such as an infrared camera and can be accurately verified.

  Conventionally, securities such as stock certificates, bonds, checks, gift certificates, lotteries, and commuter passes are often provided with machine-readable code marks such as barcodes and OCR characters. Such machine-readable information is formed using, for example, an ink that absorbs infrared light in the near infrared region on a base material surface that reflects infrared light in the near infrared region (see, for example, Patent Document 1). ).

  In addition, by utilizing the infrared reflectivity of the white ink and the infrared absorptivity of the black ink, information that can be read by a machine using both inks may be printed on the securities as a bar code pattern code mark. Securities having such a code mark read information relating to the code mark by irradiating the code mark portion with infrared rays and measuring the reflection intensity of the infrared rays reflected from the portion. In such a case, in general, in order to prevent unauthorized reading of recorded information, visible light is blocked and information is covered with a concealing layer that transmits infrared light. Is difficult to read with the naked eye.

  However, since the infrared ray absorbing substance in the infrared ray absorbing ink has a light absorbing property even in the visible region, even if a hiding layer is formed on it, it is concealed if its hiding power is insufficient. The information pattern is not only mechanically read by an infrared information reader, but its presence is easily readable by the naked eye, and is still insufficient as a means for effectively preventing counterfeiting and alteration using copying and the like.

  In order to prevent the predetermined concealment information from being deciphered with the naked eye, materials that have a low optical absorption in the visible region and that exhibit a predetermined optical absorption characteristic in regions other than the visible region have been used as information recording materials. . For example, there is a method in which a heat ray absorbing glass or an infrared absorbing glass is pulverized and an infrared absorbing material formed by pigmenting it is contained in the ink, and a code mark is formed with the ink. Since the ink containing this infrared absorbing material has little light absorption in the visible region, it is difficult to visually confirm the information formed, so it is considered as an effective means for counterfeiting, alteration, tampering, etc. I came.

  However, printed matter in which information is formed with the above-described ink and infrared information is absorbed by the information portion has an advantage that it can be easily detected using various infrared rays in a wide infrared region. It had the disadvantage that the benefits were reversed and it was easy to read. That is, it can be easily read by an infrared information reader such as an infrared camera, and concealment information such as a code mark is confirmed. 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.

The above problem can be solved by printing code marks etc. using two types of infrared absorbing inks having different spectral absorption characteristics. In this case, infrared absorbing ink can be obtained using two types of light sources or filters. The image printed in (1) is regarded as one monochrome screen, and the authenticity is determined by reading each of the images. Similarly, by providing an image with two or more types of infrared absorbing inks having different spectral absorption characteristics, it is possible to further improve the forgery prevention effect. In this case as well, each of the images captured in one monochrome screen is displayed. It must be read and true / false judgments made, making true / false judgments very difficult.
JP 2000-309736 A

  The present invention has been made paying attention to the above-mentioned problems, and an infrared absorbing ink and an infrared emitting fluorescent ink in which the absorption peak wavelength in the infrared region and the excitation peak wavelength in the infrared emission are the same. Each of the images is provided with verification images, and these images are not forgery-recognized.The same infrared light source and the same infrared information reader are used, and only the verification filter is used. The present invention provides a method for discriminating a forgery-preventing printed material that can accurately verify the existence and contents of each verification image of the printed material as described above.

  In order to achieve the above object, the invention according to claim 1 is directed to an image for verification made of an infrared-absorbing ink having an absorption peak in an infrared region on an infrared-reflective substrate, and an infrared region. And a verification image made of fluorescent ink that is excited by irradiation with excitation light having an excitation peak and emits infrared light having a wavelength longer than the excitation peak wavelength of the excitation light. An anti-counterfeit printed matter, wherein a concealing image is provided so as to conceal, and the absorption peak wavelength of the infrared absorbing ink and the excitation peak wavelength of the fluorescent ink are the same.

  The invention according to claim 2 irradiates the anti-counterfeit printed matter according to claim 1 with an infrared ray having a wavelength that is both an absorption peak wavelength of the infrared absorbing ink and an excitation peak wavelength of the fluorescent ink, and also absorbs infrared rays. Reflected image information of the verification image made of ink passes through the bandpass filter that transmits infrared light of the absorption peak wavelength, and reflected image information of the verification image made of fluorescent ink transmits the infrared light of the emission peak wavelength of fluorescent ink. A forgery-preventing printed matter discrimination method characterized in that it can be read by an infrared information reader through a bandpass filter, and the existence and contents of each verification image can be verified based on the read information. is there.

  The anti-counterfeit printed matter of the present invention is provided with verification images such as characters and barcodes using infrared absorbing ink and infrared light emitting fluorescent ink, and further, a concealing image is provided so as to cover them. Each verification image printed with each ink cannot be seen visually. Such a forgery-preventing printed matter uses a light source and an infrared information reading device having the same contents and contents of each verification image concealed in the discrimination method of the present invention, and a verification filter. It becomes possible to verify easily and accurately only by changing only, and can be used effectively for authenticity determination.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing a planar state of the forgery-preventing printed matter of the present invention, and FIG. 2 is an explanatory view showing a schematic cross-sectional configuration along line XX of the anti-counterfeit printed matter shown in FIG.

  The anti-counterfeit printed matter 1 of the present invention is arranged on the outermost surface in a state where the concealment concealment image 12 and the character image are visible. As shown in FIG. 2, on the infrared reflective substrate 11, a verification image 13 made of infrared absorbing ink having an absorption peak in the infrared region and excitation light having an excitation peak in the infrared region. And a verification image 14 made of fluorescent ink that is excited by irradiation and emits infrared light having a wavelength longer than the excitation peak wavelength of the excitation light, and further described above so as to conceal these verification images. A concealment image 12 is provided.

  As described above, the verification image 13 is printed with infrared absorbing ink having an absorption peak in the infrared region, and the verification image 14 is irradiated with excitation light having an excitation peak in the infrared region. Printed with fluorescent ink that emits infrared light having a wavelength longer than the wavelength of the excitation light. These verification images 13 and 14 are covered with a concealment image 12 made of printing ink that blocks visible light and transmits infrared rays. Accordingly, the anti-counterfeit printed matter 1 having such a configuration is configured such that only the concealment image 12 and the character image on the outermost surface are visible.

  FIG. 3 and FIG. 4 show an example of how reflected image information corresponding to each verification image is extracted when the anti-counterfeit printed matter 1 having such a configuration is discriminated by the discriminating method of the present invention. Yes.

  In extracting the reflected image information, first, the forgery prevention printed matter 1 is irradiated with infrared rays from a light source 31 that emits infrared rays having the same wavelength as the absorption peak wavelength of the infrared absorbing ink, and the reflected light is absorbed by the absorption peak of the infrared absorbing ink. The reflected image information is extracted by reading with an infrared information reader 32 such as an infrared camera or an infrared sensor through a band pass filter 21 that transmits the wavelength. FIG. 3 shows a state in which the video 22 based on the reflection image information extracted in this way is displayed on the monitor 33. As a tool for verifying the existence and contents of verification images based on information read by the infrared information reader 32, a decoder for reading a barcode may be used in addition to the monitor as described above. .

  In addition to the extraction of the reflection image information as described above, the reflection image information of the other verification image is also extracted in the forgery-preventing printed matter discrimination method of the present invention. That is, infrared light is irradiated from the light source 31 that emits infrared light having the same wavelength as the excitation peak wavelength of the excitation light that causes the fluorescent ink to be excited and emitted to the forgery prevention printed matter 1, and the reflected light has the same wavelength as the emission peak wavelength of the fluorescent ink. The image data is read by an infrared information reading device 32 such as an infrared camera or an infrared sensor through a band pass filter 23 that transmits infrared rays, and reflected image information is extracted (see FIG. 4). Even in such extraction of reflected image information, as a tool for verifying the existence of the verification image and their contents based on the information read by the infrared information reading device 32, not only the monitor as described above, A decoder for reading the bar code may be used.

  FIG. 5 is an enlarged view of the image displayed on the monitor screen when the anti-counterfeit printed matter 1 is discriminated by the method shown in FIG. 3, and the infrared reflective base of the anti-counterfeit printed matter 1 is shown. The portion of the material 11 looks whitish, and the portion of the verification image 13 printed with the infrared absorbing ink looks black. On the other hand, FIG. 6 shows an enlarged image projected on the monitor screen when the anti-counterfeit printed matter 1 is discriminated by the method shown in FIG. The portion of the verification image 14 printed with fluorescent ink looks blackish.

In short, the anti-counterfeit printed matter that is the object of discrimination is the same, but when discriminating the verification image 13 made of infrared absorbing ink, as shown in FIG. Since the portion of the image 13 looks black because it absorbs more light than the portion of the infrared reflective substrate 11, the portion of the infrared reflective substrate 11 looks relatively whitish.
On the contrary, when the verification image 14 printed with fluorescent ink is discriminated, as shown in FIG. 6, the portion of the verification image 14 printed with fluorescent ink emits light and looks whitish. The part of the reflective base material 11 looks blackish.

  FIGS. 7 and 8 show the spectroscopic analysis of an ink thin film composed of an infrared absorbing ink constituting the verification image 13 formed on the infrared reflective substrate 11 and a fluorescent ink constituting the other verification image 14. It is the graph which showed the spectral characteristic of the emitted light emitted by the waveform graph and the excitation light of fluorescent ink, and irradiation of excitation light.

  As shown in these graphs, in the anti-counterfeit printed matter of the present invention, the absorption peak wavelength of the infrared absorbing ink and the excitation peak wavelength of the excitation light of the fluorescent ink are set to be the same. Therefore, in the determination, each verification image concealed in the concealment image is changed by using the same infrared light source and infrared information reading device and changing the bandpass filter that transmits predetermined infrared light. Therefore, it is possible to accurately verify the existence and content of the image, and to provide a method for determining an anti-counterfeit printed matter that is inexpensive and has higher security.

  Hereinafter, the present invention will be described in detail with specific examples.

  White coated paper was used as the infrared reflective substrate. A barcode was printed on this coated paper by using an infrared absorbing ink (UV effect type offset ink) having the following composition by an offset printing method. Moreover, the barcode was printed similarly using the fluorescent ink of the following composition. And the pattern was printed on the upper layer of each barcode using the following process ink, and the forgery prevention printed matter was produced.

<Composition of infrared absorbing ink>
Infrared absorbing agent YKR-4010 (manufactured by Yamamoto Kasei Co., Ltd.) 5 parts FDS medium TPro (manufactured by Toyo Ink Manufacturing Co., Ltd.) 95 parts

<Composition of fluorescent ink>
Fluorescent pigment IRS-F (manufactured by Nemoto Special Chemical) 10 parts FDS medium TP (manufactured by Toyo Ink Manufacturing Co., Ltd.) 90 parts

<Process ink>
FD OL Yellow TC B (Toyo Ink Manufacturing Co., Ltd.)
FD OL Crimson TC (made by Toyo Ink Co., Ltd.)
FD OL Ai TC B (Toyo Ink Manufacturing Co., Ltd.)

  The anti-counterfeit printed matter was irradiated with infrared rays using an LED having a sharp light emitting portion near 800 nm, and the reflected light was first photographed with an infrared camera through a bandpass filter that transmits infrared rays around 800 nm. The portion of the barcode (verification image) made of the absorbent ink was black, and the other portions were projected on the monitor in white, and the reflected image information relating to the barcode that was not visible was read. Next, when the same image was taken with the above-described infrared camera through a bandpass filter that transmits infrared light around 950 nm, the barcode portion (image for verification) made of fluorescent ink was white, and the other portions were black on the monitor. Reflected image information related to the other barcode that was projected and could not be seen was read. According to the discriminating method of the present invention, the verification image is verified simply by changing two types of filters using one light source and one infrared information reader, and it is easy to determine whether it is true or false. I was able to.

It is explanatory drawing which shows the planar state of the forgery prevention printed matter of this invention. It is explanatory drawing which shows the general | schematic cross-section structure in the XX line of the forgery prevention printed matter shown in FIG. It is explanatory drawing which shows a state at the time of extracting the reflective image information which concerns on the image for a verification which consists of infrared rays absorptive ink. It is explanatory drawing which shows a state at the time of extracting the reflective image information which concerns on the image for verification consisting of fluorescent ink. It is explanatory drawing which shows the image | video projected on the monitor screen at the time of extraction of the reflected image information shown in FIG. It is explanatory drawing which shows the image | video projected on the monitor screen at the time of extraction of the reflected image information shown in FIG. It is a graph which shows the relationship between the reflectance and wavelength of a printed thin film which consists of infrared absorptive ink provided on the infrared reflective base material. It is a graph which shows the relationship of the arbitrary intensity | strength of the light for excitation light emission irradiated to fluorescent ink, and the emitted light light-emitted by the irradiation of the light.

Explanation of symbols

1. Anti-counterfeit printed matter 11. Infrared reflective base material 12. Concealment image 13, 14 ... Verification image 21, 23. Band pass filter 22. Image 31 based on reflection image information Light source 32 .. Infrared information reading device 33 .. Monitor 41 .. Absorption peak 51 of infrared absorbing ink .. Excitation peak 52 of excitation light .. Luminescence peak of fluorescent ink

Claims (2)

  Excited by irradiation of excitation light with an infrared absorption ink having an absorption peak in the infrared region and excitation light having an excitation peak in the infrared region on the infrared reflective substrate, and the excitation peak of the excitation light And a verification image made of fluorescent ink that emits infrared light having a wavelength longer than the wavelength, and further, a concealment image is provided so as to conceal these verification images, and infrared absorptivity An anti-counterfeit printed matter, wherein the absorption peak wavelength of the ink and the excitation peak wavelength of the fluorescent ink are the same.   The anti-counterfeit printed matter according to claim 1 is irradiated with infrared rays having a wavelength which is an absorption peak wavelength of infrared absorbing ink and an excitation peak wavelength of fluorescent ink, and reflection image information of a verification image made of infrared absorbing ink. Is transmitted through a band-pass filter that transmits infrared light of the absorption peak wavelength, and reflected image information of the verification image made of fluorescent ink is transmitted through a band-pass filter that transmits infrared light having the same wavelength as the emission peak wavelength of the fluorescent ink. A method for discriminating forgery-preventing printed matter, characterized in that it can be read by an infrared information reading device and the existence and contents of each verification image can be verified based on the read information.