JP2010173292A - Printing method and printed matter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent easy imitation by enhancing the anti-counterfeit effect of a printed matter when secret information is printed on consumer electronic appliances such as a cellular phone and important documents such as a pasteboard of an important printed matter. <P>SOLUTION: First information 3 is printed on a print medium 2 using photochromic inks of a plurality of colors. With respect to the printed matter 1 such as the consumer electronic appliances and the important documents, this effectively prevents counterfeit with a plurality of steps of security. Thus, the counterfeit prevention effect of the printed matter 1 is enhanced and easy imitation is prevented. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to consumer electronic devices such as mobile phones and cameras (including parts thereof; the same applies to the following), or mounts of important printed materials, banknote paper, various securities, certificates, cash vouchers, gift certificates, tickets, and price display tags. The present invention relates to a printing method and printed matter suitable for application when secret information is printed on an important document.

  With this type of consumer electronic devices and important documents, the same printing can be performed easily by developing printing fonts by personal computers and software, and by developing printing methods such as inkjet, sublimation transfer, and fusion heat transfer. It is now possible to forge easily. Under these circumstances, in recent years, there is an increasing need to prevent forgery of these consumer electronic devices and important documents.

  Among those requiring anti-counterfeiting, it is important that certain types are guaranteed to be authentic, and anti-counterfeiting printing has been performed for the purpose of preventing tampering. Yes. As such anti-counterfeiting printing, for example, by using stealth ink or fluorescent ink, it is possible to check information only under a special light source that cannot be seen under visible light ( Hereinafter, known technique 1) has been proposed (see, for example, Patent Documents 1 to 3).

  For other types that require anti-counterfeiting, it is important that the individual is proof of identity, or that the product is manufactured by a specific manufacturer. Anti-counterfeiting printing is performed for the purpose of avoiding a situation where a profit is given. As such anti-counterfeiting printing, for example, a technique for performing printing using a hologram (hereinafter referred to as publicly known technique 2) has been proposed (for example, see Patent Document 4).

JP-A-9-160495 JP-A-9-174996 Japanese Patent Laid-Open No. 10-287043 JP-A-6-43799

  However, in the known technique 1, although the color copy has an anti-counterfeiting effect, the information concealed and printed with the fluorescent ink can be easily read using an OCR (optical character reader). Furthermore, it is easy to obtain fluorescent inks, and industrial inkjet printers are also widely used. It is relatively easy to combine these for counterfeit printing. Therefore, it is difficult to reliably prevent counterfeiting and alteration of consumer electronic devices and important documents simply by printing hidden information with stealth ink or fluorescent ink.

  On the other hand, in the known technique 2, the laser light source is easier to obtain than before and hologram printing is easier, so that the anti-counterfeiting effect is currently reduced.

  In view of such circumstances, an object of the present invention is to provide a printing method and printed matter having a high anti-counterfeit effect that can prevent easy imitation.

  The first printing method according to the present invention is characterized in that the first information (3) is printed on the print medium (2) using a plurality of photochromic inks.

  The first printed matter according to the present invention is characterized in that the first information (3) by the photochromic dyes of a plurality of colors is the printed matter (1) printed on the printing medium (2).

  Here, in order to explain the present invention in an easy-to-understand manner, the description has been made in association with the reference numerals of the drawings representing the embodiments. However, it goes without saying that the present invention is not limited to the embodiments.

  According to the present invention, it is possible to effectively prevent counterfeiting of printed matter such as consumer electronic devices and important documents with multiple levels of security. It becomes possible.

It is a top view of the printed matter which concerns on Embodiment 1 of this invention, Comprising: (a) is a figure which shows the mode under visible light, (b) is a figure which shows the mode under ultraviolet irradiation. It is a top view of the printed matter which concerns on Embodiment 2 of this invention, Comprising: (a) is a figure which shows the mode under visible light, (b) is a figure which shows the mode under ultraviolet irradiation, (c) is specific infrared irradiation It is a figure which shows the lower state. It is a top view of the printed matter which concerns on Embodiment 3 of this invention, Comprising: (a) is a figure which shows the mode under visible light, (b) is a figure which shows the mode under specific infrared irradiation, (c) is ultraviolet irradiation It is a figure which shows the lower state. It is a top view of the printed matter which concerns on Embodiment 4 of this invention, Comprising: (a) is a figure which shows the mode under visible light, (b) is a figure which shows the mode under ultraviolet irradiation, (c) is specific infrared irradiation It is a figure which shows the lower state. It is a top view of the printed matter which concerns on Embodiment 5 of this invention, Comprising: (a) is a figure which shows the mode under visible light, (b) is a figure which shows the mode under ultraviolet irradiation, (c) is specific infrared irradiation It is a figure which shows the lower state. It is a top view of the printed matter which concerns on Embodiment 6 of this invention, Comprising: (a) is a figure which shows the mode under visible light, (b) is a figure which shows the mode under ultraviolet irradiation.

Embodiments of the present invention will be described below.
Embodiment 1 of the Invention

  FIG. 1 is a diagram according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the printed matter 1 according to the first embodiment includes a print medium 2 such as paper, and four colors (blue, yellow, green, purple) are provided at the center of the print medium 2. As the first information 3 by the photochromic (photochromic) dye, an 8-digit number “12345678” is printed. Here, the photochromic dye “12” in the first information 3 exhibits blue (blue) under visible light when irradiated with ultraviolet light, and the photochromic dye “34” in the first information 3 is ultraviolet light. Irradiation gives yellow (yellow) under visible light. In addition, the photochromic dye “56” in the first information 3 exhibits green (green) under visible light when irradiated with ultraviolet light, and the photochromic dye “78” in the first information 3 is ultraviolet light. Irradiation shows purple (purple) under visible light.

  Therefore, the printed matter 1 cannot see the first information 3 printed on the printing medium 2 under visible light as shown in FIG. 1A, but has a wavelength of 300 by an ultraviolet radiation lamp such as a black light. When ultraviolet rays of about ˜400 nm are irradiated, as shown in FIG. 1B, first information 3 of four colors (that is, “12” for blue, “34” for yellow, “56” for green, Purple "78") becomes visible.

  When the printed matter 1 having the above configuration is produced, the following procedure is used.

  First, in the ink preparation process, four-color (blue, yellow, green, purple) photochromic dyes are dissolved in an appropriate solvent to obtain four-color (blue, yellow, green, purple) photochromic (photochromic) ink. Prepare. For example, 0.5 g of each photochromic dye is dissolved in 100 ml of thinner to prepare four-color photochromic ink.

  Thereafter, the process proceeds to a printing execution process, and the first information 3 is printed on the central portion of the printing medium 2 using the four-color photochromic ink prepared earlier. For example, an inkjet printer is connected to a personal computer for printing control, each photochromic ink is set on a separate head, and an appropriate command is issued from the personal computer, so that the first information 3 is printed on the printing medium 2 by the inkjet printer To do.

  Here, the production work of the printed material 1 is completed, and the printed material 1 is completed.

  And in the printed matter 1 produced in this way, forgery can be effectively prevented by two steps of security, as will be described below.

  That is, first, as described above, the first information 3 on the printing medium 2 cannot be viewed under visible light unless light of a specific wavelength (ultraviolet rays) is applied. Therefore, it is unclear for a person who intends to counterfeit the printed material 1 (hereinafter referred to as counterfeiter) even in which part of the print medium 2 the first information 3 is printed. Therefore, the printed matter 1 exhibits a high anti-counterfeit effect. This is the first level of security against counterfeiting of the printed material 1.

  Furthermore, even if the printing portion of the first information 3 is found, in addition to the high cost of the photochromic dye, it is difficult to find a photochromic dye exhibiting the same color as each of the four colors here. The forgery prevention effect of the printed matter 1 is further enhanced. This is the second level of security against counterfeiting of the printed material 1.

  As described above, the counterfeiting of the printed matter 1 is effectively prevented by the two-stage security. Therefore, the imitation prevention effect of the printed matter 1 can be enhanced to prevent easy imitation.

Moreover, when printing the 1st information 3 by inkjet printing, since a fine pattern can be printed easily, there exists an advantage which is hard to forge.
[Embodiment 2 of the Invention]

  FIG. 2 is a diagram according to Embodiment 2 of the present invention.

  As shown in FIG. 2, the printed matter 1 according to the second embodiment includes a print medium 2 such as paper, and four colors (blue, yellow, green, purple) are provided on the upper stage of the print medium 2. As the first information 3 of the photochromic dye, 8-digit number “12345678” is printed. Here, the photochromic dye “12” in the first information 3 exhibits blue (blue) under visible light when irradiated with ultraviolet light, and the photochromic dye “34” in the first information 3 is ultraviolet light. Irradiation gives yellow (yellow) under visible light. In addition, the photochromic dye “56” in the first information 3 exhibits green (green) under visible light when irradiated with ultraviolet light, and the photochromic dye “78” in the first information 3 is ultraviolet light. Irradiation shows purple (purple) under visible light.

  Therefore, the printed matter 1 cannot see the first information 3 printed on the printing medium 2 under visible light, as shown in FIG. 2A, but has a wavelength of 300 by an ultraviolet radiation lamp such as a black light. When ultraviolet rays of about ˜400 nm are irradiated, as shown in FIG. 2B, first information 3 of four colors (namely, “12” for blue, “34” for yellow, “56” for green, Purple "78") becomes visible.

  Further, in the lower part of the print medium 2 (that is, a part different from the first information 3), there are seven pieces of second information 4 by the infrared luminescent dye that emits visible light in response to infrared rays in a specific wavelength range. The uppercase alphabet “ABCDEFG” is printed. Accordingly, when the printed matter 1 is irradiated with infrared rays in a specific wavelength range, as shown in FIG. 2C, the second information 4 is colored to exhibit a predetermined color (for example, red, green).

  When the printed matter 1 having the above configuration is produced, the following procedure is used.

  First, in the ink preparation step, four colors (blue, yellow, green, purple) of photochromic ink are prepared in the same manner as in the first embodiment. Also, an infrared light emitting ink that emits visible light in response to infrared in a specific wavelength region is prepared by dissolving an infrared light emitting dye that emits visible light in response to infrared in a specific wavelength region in an appropriate solvent. For example, an infrared light emitting ink is prepared by dissolving 1.0 g of an infrared light emitting dye in 100 ml of thinner.

  Thereafter, the process proceeds to a printing execution step, and the first information 3 is printed on the upper stage of the printing medium 2 using the four-color photochromic ink prepared earlier, as in the first embodiment. Further, the second information 4 is printed on the lower part of the print medium 2 using the infrared light emitting ink prepared earlier. For example, an inkjet printer is connected to a personal computer for printing control, infrared light emitting ink is set on the head, and the second information 4 is inkjet printed on the print medium 2 by the inkjet printer by appropriately commanding from the personal computer.

  Here, the production work of the printed material 1 is completed, and the printed material 1 is completed.

  And in the printed matter 1 produced in this way, as described below, forgery can be effectively prevented with three levels of security.

  That is, first, as described above, the first information 3 on the print medium 2 cannot be viewed unless it is irradiated with light of a specific wavelength (ultraviolet light) under visible light. The second information 4 cannot be seen unless light of a specific wavelength (infrared rays) is applied. Therefore, it is unclear to the counterfeiter at which part of the print medium 2 the first and second information 3 and 4 are printed. Therefore, the printed matter 1 exhibits a high anti-counterfeit effect. This is the first level of security against counterfeiting of the printed material 1.

  Furthermore, even if the printing portion of the first information 3 is found, in addition to the high cost of the photochromic dye, it is difficult to find a photochromic dye exhibiting the same color as each of the four colors here. The forgery prevention effect of the printed matter 1 is further enhanced. This is the second level of security against counterfeiting of the printed material 1.

  In addition, even if the printing site of the second information 4 is found, in addition to the fact that the infrared light-emitting dye that emits visible light in response to the infrared of the specific wavelength region is expensive, the infrared light of the specific wavelength region is emitted. Therefore, the forgery prevention effect of the printed matter 1 is further enhanced. In addition, the infrared wavelength in the specific wavelength range needs to be a single wavelength, and the wavelength is not known by a third party, so it is very difficult to prepare this infrared ray. Therefore, the forgery prevention effect of the printed matter 1 is remarkably increased. This is the third level of security against counterfeiting of the printed material 1.

  As described above, forgery of the printed matter 1 is effectively prevented by the three-stage security, and therefore it is possible to increase the anti-counterfeit effect of the printed matter 1 and prevent easy imitation.

Moreover, when printing the 1st information 3 by inkjet printing, since a fine pattern can be printed easily, there exists an advantage which is hard to forge.
Embodiment 3 of the Invention

  FIG. 3 is a diagram according to Embodiment 3 of the present invention.

  As shown in FIG. 3, the printed matter 1 according to the third embodiment has a print medium 2 such as paper. The upper portion of the print medium 2 is visible light in response to infrared rays in a specific wavelength range. Seven uppercase alphabets “ABCDEFG” are printed as the second information 4 by the infrared light emitting dye that emits. Therefore, the printed matter 1 cannot see the second information 4 printed on the printing medium 2 under visible light, as shown in FIG. 3A, but when irradiated with infrared rays in a specific wavelength range. As shown in FIG. 3B, the second information 4 is colored to exhibit a predetermined color (for example, red, green).

  In the lower part of the print medium 2 (that is, a portion different from the second information 4), seven lower-case alphabets are used as third information 5 by a fluorescent dye that is transparent to visible light and emits ultraviolet light. “Abcdefg” is printed. Accordingly, when the printed matter 1 is irradiated with ultraviolet rays having a wavelength of about 300 to 400 nm by an ultraviolet radiation lamp such as a black light, as shown in FIG. For example, blue-purple).

  When the printed matter 1 having the above configuration is produced, the following procedure is used.

  First, in the ink preparation process, an infrared light emitting ink that emits visible light in response to infrared rays in a specific wavelength region is prepared in the same manner as in the second embodiment. Further, a fluorescent ink that is transparent to visible light and that emits light by ultraviolet rays is dissolved in an appropriate solvent to prepare a fluorescent ink that is transparent to visible light and emits light by ultraviolet rays. For example, a fluorescent ink is prepared by dissolving 1.0 g of a fluorescent dye in 100 ml of thinner.

  Thereafter, the process proceeds to a printing execution step, and the second information 4 is printed on the upper portion of the print medium 2 using the infrared light-emitting ink prepared earlier as in the second embodiment. Also, the third information 5 is printed on the lower part of the print medium 2 using the fluorescent ink prepared earlier. For example, an inkjet printer is connected to a personal computer for print control, fluorescent ink is set on the head, and the third information 5 is ink-jet printed on the print medium 2 by the inkjet printer by appropriately instructing from the personal computer.

  Here, the production work of the printed material 1 is completed, and the printed material 1 is completed.

  And in the printed matter 1 produced in this way, as described below, forgery can be effectively prevented with three levels of security.

  That is, first, the second information 4 on the print medium 2 cannot be seen unless light (infrared rays) of a specific wavelength is applied, and the third information 5 on the print medium 2 is specified. It cannot be seen unless light (ultraviolet rays) with a wavelength of is applied. Therefore, it is unclear to the counterfeiter at which part of the print medium 2 the second and third information 4 and 5 are printed. Therefore, the printed matter 1 exhibits a high anti-counterfeit effect. This is the first level of security against counterfeiting of the printed material 1.

  Furthermore, even if the printing site of the second information 4 is found, in addition to the fact that the infrared light emitting dye that emits visible light in response to the infrared of the specific wavelength region is expensive, the infrared light of the specific wavelength region is emitted. Since it is necessary to prepare the light source which performs, the forgery prevention effect of the printed matter 1 becomes still higher. In addition, the infrared wavelength in the specific wavelength range needs to be a single wavelength, and the wavelength is not known by a third party, so it is very difficult to prepare this infrared ray. Therefore, the forgery prevention effect of the printed matter 1 is remarkably increased. This is the second level of security against counterfeiting of the printed material 1.

  Even if the printing site of the third information 5 is found, it is necessary to prepare a light source that emits ultraviolet rays in addition to the expensive fluorescent dye that is transparent to visible light and emits ultraviolet rays. Therefore, the forgery prevention effect of the printed material 1 becomes higher. This is the third level of security against counterfeiting of the printed material 1.

  As described above, forgery of the printed matter 1 is effectively prevented by the three-stage security, and therefore it is possible to increase the anti-counterfeit effect of the printed matter 1 and prevent easy imitation.

Moreover, when printing the 1st information 3 by inkjet printing, since a fine pattern can be printed easily, there exists an advantage which is hard to forge.
[Embodiment 4 of the Invention]

  FIG. 4 is a diagram according to Embodiment 4 of the present invention.

  As shown in FIG. 4, the printed matter 1 according to the fourth embodiment has a print medium 2 such as paper, and four colors (blue, yellow, green, purple) are provided at the center of the print medium 2. As the first information 3 of the photochromic dye, 8-digit number “12345678” is printed. Here, the photochromic dye “12” in the first information 3 exhibits blue (blue) under visible light when irradiated with ultraviolet light, and the photochromic dye “34” in the first information 3 is ultraviolet light. Irradiation gives yellow (yellow) under visible light. In addition, the photochromic dye “56” in the first information 3 exhibits green (green) under visible light when irradiated with ultraviolet light, and the photochromic dye “78” in the first information 3 is ultraviolet light. Irradiation shows purple (purple) under visible light.

  Further, in the central portion of the print medium 2 (that is, the same part as the first information 3), as the second information 4 by the infrared light emitting dye that emits visible light in response to infrared rays in a specific wavelength range, 8 A digit number “12345678” is printed so as to overlap the first information 3.

  Further, in the central portion of the print medium 2 (that is, the same part as the first information 3), the third information 5 by the fluorescent dye that is transparent to visible light and emits ultraviolet light is used as an 8-digit number. The number “12345678” is printed so as to overlap the first information 3.

  Therefore, the printed matter 1 cannot see the first to third information 3, 4, and 5 printed on the printing medium 2 under visible light, as shown in FIG. When ultraviolet rays having a wavelength of about 300 to 400 nm are irradiated by the ultraviolet radiation lamp, as shown in FIG. 4B, first information 3 of four colors (namely, “12” for blue, “34” for yellow, A color in which the color of the third information 5 (for example, bluish purple) is synthesized with “56” of green and “78” of purple) becomes visible. In addition, when the printed matter 1 is irradiated with infrared rays in a specific wavelength region, as shown in FIG. 4C, the second information 4 is colored to exhibit a predetermined color (for example, red, green).

  When the printed matter 1 having the above configuration is produced, the following procedure is used.

  First, in the ink preparation step, four colors (blue, yellow, green, purple) of photochromic ink are prepared in the same manner as in the first embodiment. Further, in the same manner as in Embodiment 2 described above, an infrared light emitting ink that emits visible light in response to infrared light in a specific wavelength range is prepared. Further, in the same manner as in Embodiment 3 described above, a fluorescent ink that is transparent to visible light and emits light with ultraviolet light is prepared.

  Thereafter, the process proceeds to a printing execution step, and the first information 3 is printed at the center of the printing medium 2 using the four-color photochromic ink prepared earlier, as in the first embodiment. Similarly to the second embodiment described above, the second information 4 is printed over the first information 3 in the center of the print medium 2 using the infrared light emitting ink prepared earlier. Further, similarly to the above-described third embodiment, the third information 5 is printed over the second information 4 in the center of the print medium 2 using the fluorescent ink prepared earlier.

  Here, the production work of the printed material 1 is completed, and the printed material 1 is completed.

  And in the printed matter 1 produced in this way, forgery can be effectively prevented with four levels of security, as will be described below.

  That is, first, as described above, the first and third information 3 and 5 on the print medium 2 cannot be viewed under visible light unless light of a specific wavelength (ultraviolet light) is applied, The second information 4 on the print medium 2 cannot be seen unless light (infrared rays) having a specific wavelength is applied. Therefore, it is unclear to the counterfeiter even in which part of the print medium 2 the first to third information 3, 4 and 5 are printed. Therefore, the printed matter 1 exhibits a high anti-counterfeit effect. This is the first level of security against counterfeiting of the printed material 1.

  Furthermore, even if the printing portion of the first information 3 is found, in addition to the high cost of the photochromic dye, it is difficult to find a photochromic dye exhibiting the same color as each of the four colors here. The forgery prevention effect of the printed matter 1 is further enhanced. This is the second level of security against counterfeiting of the printed material 1.

  In addition, even if the printing site of the second information 4 is found, in addition to the fact that the infrared light-emitting dye that emits visible light in response to the infrared of the specific wavelength region is expensive, the infrared light of the specific wavelength region is emitted. Therefore, the forgery prevention effect of the printed matter 1 is further enhanced. In addition, the infrared wavelength in the specific wavelength range needs to be a single wavelength, and the wavelength is not known by a third party, so it is very difficult to prepare this infrared ray. Therefore, the forgery prevention effect of the printed matter 1 is remarkably increased. This is the third level of security against counterfeiting of the printed material 1.

  Even if the printing site of the third information 5 is found, it is necessary to prepare a light source that emits ultraviolet rays in addition to the expensive fluorescent dye that is transparent to visible light and emits ultraviolet rays. Therefore, the forgery prevention effect of the printed material 1 becomes higher. This is the fourth level of security against counterfeiting of the printed material 1.

  As described above, the counterfeiting of the printed matter 1 is effectively prevented with four levels of security. Therefore, it is possible to increase the anti-counterfeiting effect of the printed matter 1 and prevent easy imitation.

In addition, since the first to third information 3, 4, and 5 are the same information (“12345678”) printed on the same part (center) on the print medium 2, the forger is It is highly probable that people will be relieved only by looking at the one-step anti-counterfeiting technology without realizing that the information is printed in layers. As a result, the anti-counterfeiting effect of the printed material 1 becomes extremely high.
[Embodiment 5 of the Invention]

  FIG. 5 is a diagram according to Embodiment 5 of the present invention.

  As shown in FIG. 5, the printed matter 1 according to the fifth embodiment has a print medium 2 such as paper. On the left side of the lower part of the print medium 2 is the first information 3 by the photochromic dye, Three alphabets “Gen” are printed. Further, on the right side of the upper part of the printing medium 2 (that is, a portion different from the first information 3), as the second information 4 by the infrared light emitting dye that emits visible light in response to infrared rays in a specific wavelength range, 4 Two uppercase letters “ABCD” are printed. Further, on the right side of the lower part of the print medium 2 (that is, a part different from the first information 3 and the second information 4), the third information by the fluorescent dye that is transparent to visible light and emits ultraviolet light. 5, four lowercase alphabets “uine” are printed. Further, on the left side of the upper part of the print medium 2 (that is, a part different from the first information 3, the second information 4, and the third information 5), a 4-digit number is used as the fourth information 6 by the visible dye. “1234” is printed.

  Therefore, the printed matter 1 can only see the fourth information 6 (that is, “1234”) printed on the print medium 2 under visible light, as shown in FIG. When ultraviolet rays having a wavelength of about 300 to 400 nm are irradiated by the radiation lamp, as shown in FIG. 5B, in addition to the fourth information 6, the first information 3 (ie, “Gen”) and the first information 3 information 5 (ie, “uine”) becomes visible. Further, when the printed matter 1 is irradiated with infrared rays in a specific wavelength region, the second information 4 (that is, “ABCD”) is visible in addition to the fourth information 6 as shown in FIG. 5C. It becomes like this.

  When the printed matter 1 having the above configuration is produced, the following procedure is used.

  First, in the ink preparation step, a photochromic ink is prepared in the same manner as in the first embodiment. Further, in the same manner as in Embodiment 2 described above, an infrared light emitting ink that emits visible light in response to infrared light in a specific wavelength range is prepared. Further, in the same manner as in Embodiment 3 described above, a fluorescent ink that is transparent to visible light and emits light with ultraviolet light is prepared. Further, a visible ink is prepared by dissolving the visible dye in a suitable solvent.

  Thereafter, the process proceeds to a printing execution process, and the first information 3 is printed on the left side of the lower part of the printing medium 2 using the photochromic ink prepared earlier, as in the first embodiment. Similarly to the second embodiment described above, the second information 4 is printed on the right side of the upper stage of the print medium 2 using the infrared light emitting ink prepared earlier. Similarly to the third embodiment described above, the third information 5 is printed on the right side of the lower part of the print medium 2 using the fluorescent ink prepared earlier. Further, the fourth information 6 is printed on the left side of the upper stage of the print medium 2 using the visible ink prepared earlier. For example, an inkjet printer is connected to a personal computer for printing control, visible ink is set in the head, and the fourth information 6 is ink-jet printed on the print medium 2 by the inkjet printer by appropriately instructing from the personal computer.

  Here, the production work of the printed material 1 is completed, and the printed material 1 is completed.

  And in the printed matter 1 produced in this way, forgery can be effectively prevented with four levels of security, as in the fourth embodiment. Therefore, it becomes possible to increase the effect of preventing forgery of the printed matter 1 and prevent easy imitation.

Here, the first to fourth information items 3, 4, 5, and 6 are respectively transferred to different portions on the print medium 2 (the lower left portion of the print medium 2, the upper right portion, the lower right portion, and the upper left portion). Although the printed matter 1 that has been printed has been illustrated and described, two or more pieces of information among the first to fourth pieces of information 3, 4, 5, and 6 are printed on the same portion on the print medium 2. Of course you can.
[Sixth Embodiment of the Invention]

  FIG. 6 is a diagram related to Embodiment 6 of the present invention.

  As shown in FIG. 6, the printed material 1 according to the sixth embodiment is replaced with an 8-digit number as the first information 3 by the photochromic dyes of two colors (blue and red) at the center of the printing medium 2. The configuration is the same as that of the first embodiment except that the two-dimensional matrix pattern information is printed.

  In this pattern information, 8 cells (first row, first column, first row, fourth column) indicated by oblique lines rising to the right among the 16 cells constituting the 4 × 4 two-dimensional matrix. , 2nd row, 1st column, 2nd row, 4th column, 3rd row, 1st column, 3rd row, 4th column, 4th row, 1st column, 4th row, 4th column) The photochromic dye exhibiting blue (blue) under visible light is applied by the irradiation, and two squares (second row, second column, third row, third column) indicated by slanting lines to the right Each cell is coated with a photochromic dye that exhibits red under visible light by irradiation with ultraviolet rays.

  Therefore, the printed material 1 cannot see the first information 3 printed on the printing medium 2 under visible light, as shown in FIG. 6A, but has a wavelength of 300 by an ultraviolet radiation lamp such as black light. When ultraviolet rays of about ˜400 nm are irradiated, as shown in FIG. 6B, the first information 3 of two colors appears as an “N” shape as a whole. At this time, two vertical lines constituting “N” exhibit blue under visible light, and one oblique line composing “N” exhibits red under visible light.

  When producing the printed matter 1 having the above-described configuration, the same procedure as that of the first embodiment is used.

Moreover, in this printed matter 1, forgery can be effectively prevented with two-stage security, as in the first embodiment. Therefore, it becomes possible to increase the effect of preventing forgery of the printed matter 1 and prevent easy imitation.
Embodiment 7 of the Invention

  In the second embodiment described above, the first information 3 by the photochromic dye and the second information 4 by the infrared light emitting dye that emits visible light in response to infrared light in a specific wavelength range are mutually connected on the print medium 2. The printed matter 1 printed on different parts has been described. In the third embodiment described above, the second information 4 by the infrared light emitting dye that emits visible light in response to infrared light in a specific wavelength range, and the fluorescent dye that is transparent to visible light and emits light by ultraviolet light. The printed information 1 in which the third information 5 is printed on different portions of the print medium 2 has been described.

  However, it is also possible to combine the first information 3 by the photochromic dye and the third information 5 by the fluorescent dye that is transparent to visible light and emits light with ultraviolet light. At this time, the first information 3 by the photochromic dye and the third information 5 by the fluorescent dye that is transparent to visible light and emits ultraviolet light are separately printed on different portions of the print medium 2. Alternatively, it may be printed over the same part on the print medium 2.

Also in this case, forgery can be effectively prevented with the three-stage security, as in the second and third embodiments. Therefore, it becomes possible to increase the effect of preventing forgery of the printed matter 1 and prevent easy imitation.
[Eighth Embodiment]

  In Embodiment 4 described above, the first information 3 by the photochromic dye, the second information 4 by the infrared light emitting dye that emits visible light in response to infrared light in a specific wavelength range, and transparent to visible light. In addition, the printed information 1 in which the third information 5 by the fluorescent dye that emits light by ultraviolet rays is printed in a form overlapping the same part on the print medium 2 has been described. One or more pieces of information can be printed on another part of the print medium 2.

Also in this case, forgery can be effectively prevented with four levels of security, as in the fourth embodiment. Therefore, it becomes possible to increase the effect of preventing forgery of the printed matter 1 and prevent easy imitation.
[Other Embodiments of the Invention]

  In Embodiments 4 and 8 described above, in addition to the first information 3 based on the photochromic dye, the second information 4 based on the infrared light emitting dye that emits visible light in response to infrared rays in a specific wavelength range, and visible information The third information 5 by the fluorescent dye that is transparent to light and emits light by ultraviolet rays will be described for the printed matter 1 printed on the print medium 2. In the fifth embodiment described above, the first information by the photochromic dye is used. In addition to the information 3, the second information 4 by an infrared light emitting dye that emits visible light in response to infrared rays in a specific wavelength range, and the third information by a fluorescent dye that is transparent to visible light and emits light by ultraviolet light. The printed information 1 on which the information 5 and the fourth information 6 by the visible dye are printed on the printing medium 2 have been described.

  However, the dye constituting the second to fourth information 4, 5, 6 (hereinafter collectively referred to as "fifth information") to be printed in addition to the first information 3 is the above-mentioned dye. Not only dyes (infrared light emitting dyes, fluorescent dyes, visible dyes), but also a plurality of types (two or more types) of dyes that emit light in response to light sources having different wavelengths can be widely used. At this time, the fifth information may be separately printed on a part different from the first information 3 on the print medium 2, but the fifth information is the same information as the first information 3. May be printed so as to overlap the same part on the print medium 2. In this case, since the fifth information overlaps the first information 3, the counterfeiter does not notice that a plurality of pieces of information are printed in such a manner, and sees one-step anti-counterfeiting technology. It is highly probable that you will be relieved just by doing it. As a result, the anti-counterfeiting effect of the printed material 1 becomes extremely high.

  In the first, second, and fourth embodiments described above, the case where the four-color photochromic dye is used has been described. In the sixth embodiment, the case where the two-color photochromic dye is used has been described. By periodically performing the rearrangement and the color type exchange, the forgery prevention effect of the printed matter 1 can be further enhanced. In addition, the number of colors of the photochromic dye is not necessarily four, and can be any plural number (two or more).

  The present invention is widely applied to consumer electronic devices such as mobile phones and cameras, or important documents such as mounts of important printed matter, bill paper, various securities, certificates, cash vouchers, gift certificates, tickets, and money amount display tags. Can do.

1 …… Printed matter 2 …… Print medium 3 …… First information 4 …… Second information 5 …… Third information 6 …… Fourth information

Claims (18)

  A printing method comprising printing first information on a print medium using a plurality of colors of photochromic ink.   2. The printing method according to claim 1, wherein the second information is printed on the print medium using an infrared light emitting ink that emits visible light in response to infrared light in a specific wavelength range.   The printing method according to claim 2, wherein as the second information, the same information as the first information is printed on the same part as the first information on the print medium.   The printing method according to any one of claims 1 to 3, wherein the third information is printed on the printing medium using a fluorescent ink that is transparent to visible light and emits light with ultraviolet rays.   The printing method according to claim 4, wherein the same information as the first information is printed as the third information on the same part as the first information on the print medium.   The printing method according to claim 1, wherein the fourth information is printed on the print medium using visible ink.   The printing method according to claim 6, wherein as the fourth information, the same information as the first information is printed on the same part as the first information on the print medium.   The printing method according to claim 1, wherein the fifth information is printed on the print medium using a plurality of types of ink that emit light in response to light sources having different wavelengths.   The printing method according to claim 8, wherein the same information as the first information is printed as the fifth information on the same part as the first information on the print medium.   Printed matter, wherein the first information by the photochromic dyes of a plurality of colors is printed on a print medium.   11. The printed material according to claim 10, wherein the second information by the infrared light emitting dye that emits visible light in response to infrared light in a specific wavelength range is printed on the print medium.   The said 2nd information is the same information as the said 1st information, Comprising: The information printed on the same site | part as the said 1st information in the said printing medium is characterized by the above-mentioned. Prints.   The printed matter according to any one of claims 10 to 12, wherein the third information by the fluorescent dye that is transparent to visible light and emits light by ultraviolet rays is printed on the print medium.   The third information is the same information as the first information, and is information printed on the same part as the first information on the print medium. Prints.   The printed matter according to any one of claims 10 to 14, wherein the fourth information by the visible dye is printed on the print medium.   16. The fourth information according to claim 15, wherein the fourth information is the same information as the first information, and is printed on the same part of the print medium as the first information. Prints.   11. The printed material according to claim 10, wherein fifth information by a plurality of types of dyes that emit light in response to light sources having different wavelengths is printed on the print medium.   18. The fifth information according to claim 17, wherein the fifth information is the same information as the first information and is printed on the same part as the first information on the print medium. Prints.

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