JP2013001077A - Optical reading form - Google Patents

Abstract

An optical reading code is reliably prevented from being copied using a copying machine.
An optical reading form 10 of the present invention includes an optical reading code 13 in which a thermal layer 11b is colored in an infrared color on a printing surface of a thermal paper 11 and a non-infrared light so as to conceal the optical reading code 13. And a concealing layer 14 printed with absorbing ink.
[Selection] Figure 2

Description

  The present invention relates to an optical reading form that can prevent duplication by a copying machine.

  In general, a QR code (registered trademark, the same applies hereinafter) is widely known as an optical reading code read by an optical reading device. Usually, this QR code symbol is formed on a substrate made of paper, a label or the like by a method such as toner printing, thermal printing, printing with black ink or color ink (for example, see Patent Document 1 below). reference.). In addition, as a method of reading QR code data, there is generally a method of taking an image with a CCD camera and acquiring and reading a contrast value (difference between a background cell and a color cell).

JP 2001-307154 A

  However, if the form with the QR code is copied by a copying machine, the QR code of the form after copying can be read by the above method. For this reason, if a copier is used, there is a problem that the same form with a regular QR code can be easily duplicated.

  Therefore, the present invention has been made to solve such problems, and an object thereof is to prevent duplication of an optical reading code using a copying machine.

  In order to achieve the above object, an optical reading form according to the present invention includes an optical reading code formed by infrared coloring of a thermal layer or an optical reading code made of an infrared absorbing material, and an optical reading code on a printing surface of a substrate. And a concealing layer made of an infrared non-absorbing material to be concealed.

  As the substrate, paper such as high-quality paper, recycled paper, thermal paper, thermal transfer coated paper, and labels, or resin films such as polyester film and polypropylene film can be used according to the printer to be used. As the printer, for example, printers of various printing methods such as an ink jet printer, a laser printer, a thermal printer, and a thermal transfer printer can be used.

  In the optical reading form having the above-described configuration, a protective layer made of matte ink is laminated on the masking layer, or the masking layer is made of a mixed ink obtained by adding a matting agent to infrared non-absorbing ink. good. Further, a protective layer made of heat-resistant rubbing ink may be laminated on the masking layer, or the masking layer may be made of heat-resistant rubbing ink.

  In the optical reading form having the above-described configuration, the optical reading code is printed with infrared light absorbing toner, and a concealing layer is printed on the background of the optical reading code with an infrared non-absorbing material of the same color as the infrared light absorbing toner. In addition, it is possible to adopt a configuration in which a protective layer is printed with a clear toner in a portion other than the optical reading code.

  Further, the optical reading form according to the present invention comprises a determination code made of a light-colored infrared light absorbing material in the visible light region and a concealing layer made of an infrared light non-absorbing material for concealing the determination code on the printing surface of the substrate. And further comprising.

  Furthermore, in the optical reading form according to the present invention, the optical reading code is printed with the infrared light absorbing ink, and the concealing layer is printed on the background of the optical reading code with the infrared light non-absorbing ink of the same color as the infrared light absorbing ink. And a pseudo code made of the same type of optical reading code as that of the optical reading code is printed with infrared non-absorbing ink.

  In addition, it is good to provide the permeation | transmission prevention layer by light-shielding ink in the position corresponding to an optical reading code | cord | chord on the non-printing surface of a base material.

  According to the optical reading form according to the present invention, when this is copied with a copying machine, the concealing layer made of the non-absorbing material of infrared light is copied with the toner, and is visually reproduced uniformly. It is impossible to reproduce the symbol shape of the hidden optical reading code. For this reason, the optical reading form after copying cannot clearly recognize the symbol shape of the optical reading code even if the toner has some infrared light absorption characteristics. Therefore, the optical reading form after copying cannot be read by the optical reading device with the data recorded in the optical reading code, and it can be easily determined that it has been copied, and forgery using a copying machine is ensured. Can be prevented.

The top view which shows 1st Embodiment of the optical reading form which concerns on this invention. FIG. 2 is a cross-sectional view of the optical reading form in FIG. 1 taken along line AA. Sectional drawing which shows the modification of the optical reading form of FIG. Sectional drawing which shows the modification of the optical reading form of FIG. Sectional drawing which shows the modification of the optical reading form of FIG. The top view which shows 2nd Embodiment of the optical reading form which concerns on this invention. BB sectional drawing of the optical reading form of FIG. Sectional drawing which shows the modification of the optical reading form of FIG. Sectional drawing which shows the modification of the optical reading form of FIG. Sectional drawing which shows the modification of the optical reading form of FIG. The top view which shows 3rd Embodiment of the optical reading form which concerns on this invention. CC sectional drawing of the optical reading form of FIG. The top view which shows 4th Embodiment of the optical reading form which concerns on this invention. FIG. 14 is a DD cross-sectional view of the optical reading form in FIG. 13. The top view which shows 5th Embodiment of the optical reading form which concerns on this invention. EE sectional drawing of the optical reading form of FIG.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings attached to the application.

[First Embodiment]
1 to 5 show a first embodiment of the present invention. As shown in FIG. 1, the optical reading form 10 of the present embodiment is provided with a concealing layer 14 for concealing the optical reading code 13 printed in the optical reading code printing column 12 on the printing surface of the base material 11, and a copying machine. Is provided with a function for preventing the optical reading code 13 from being duplicated.

  In the present embodiment, thermal paper that emits infrared light is used as the substrate 11 so that printing can be performed by a thermal printer. As shown in FIG. 2, the thermal paper 11 is obtained by laminating and integrating a thermal layer 11b on a paper 11a. The thermal layer 11b is formed by dispersing a leuco dye (electron donor) and an acidic substance (electron acceptor) that emit infrared light as solid fine particles in a resin binder, and uniformly coating the resultant on the paper 11a. ing. When this thermal layer 11b is heated with a thermal head, both components of the leuco dye and the acidic substance react with each other to produce infrared color and absorb infrared light in a specific wavelength region.

  A reading code printing column 12 is provided at the center of the thermal paper 11, and an optical reading code 13 for reading predetermined information with an optical reading device is printed on the printing column 12. In this embodiment, the QR code of model 1 is adopted as an example of the optical reading code 13, and the finder pattern, the timing pattern, and the data cell among the symbols of the optical reading code (QR code) 13 heat the thermal layer 11b. With thermal printing. In the data cell of the QR code 13, various data are code-converted and recorded.

  In the reading code printing column 12, a concealing layer 14 is provided to conceal the QR code 13 to be printed so that it cannot be seen from the outside. The masking layer 14 is made of an infrared non-absorbing ink that does not absorb infrared light in a specific wavelength range, and is configured by covering and printing this ink on the thermal layer 11b according to the size of the QR code 13. .

  When the QR code 13 is subjected to thermal printing, the thermal head rubs against heat, so that the surface state of the masking layer 14 is deformed due to heat shrinkage or the like, and the infrared light non-absorbing ink constituting the masking layer 14 is in a blank state. May be. When affected by such thermal rubbing, the symbol shape of the QR code 13 can be visually recognized from above the concealing layer 14, so that the QR code 13 is duplicated.

  Therefore, the present embodiment is characterized in that the protective layer 15 is provided on the concealing layer 14 so that the ink on the printing surface is not in an unbleached state. The protective layer 15 is configured such that the surface becomes an uneven state (matt state) by overprinting a transparent mat ink over the entire surface of the thermal paper 11 from the top of the concealing layer 14. As an example of such a mat ink, UV mat OP varnish (trade name, manufactured by T & K TOKA) can be used.

  By the way, when thin paper (eg, about 80 μm thick) is used for the paper 11a, the QR code 13 covered with the concealing layer 14 can be seen through from the back side of the paper 11a by holding the thermal paper 11 over light. It is also possible. In order to avoid this, a transmission preventing layer 16 is provided on the non-printing surface of the thermal paper 11 at a position corresponding to the optical reading code printing column 12. The transmission preventing layer 16 can be configured by printing a light-blocking ink that blocks light on the back surface of the paper 11a with a solid coating, or by partial printing with a background pattern or the like.

  The optical reading form 10 of the present embodiment is configured as described above, and the operation thereof will be described below. According to this optical reading form 10, the protective layer 15 made of matte ink is provided on the outermost layer of the printing surface. For this reason, when the QR code 13 is printed, even if the printing surface is roughened due to the thermal scrubbing of the thermal head, the protective layer 15 is originally in a concavo-convex state (matt state) due to the characteristics of the mat ink. As a result, no print marks can be confirmed. Therefore, since the symbol shape of the QR code 13 cannot be visually recognized from above the protective layer 15, the duplication of the QR code 13 can be prevented.

  Further, light transmission is blocked by the transmission preventing layer 16 provided on the back surface of the paper 11a. For this reason, even if the form 10 is held over light, the QR code 13 is not seen through from the back side, and illegal reading can be prevented.

  On the other hand, when reading the data of the optical reading form 10, the infrared light irradiated from the optical reading device (QR code reader) is a protective layer 15 made of transparent mat ink and a concealing layer made of infrared non-absorbing ink. 14, and the symbol of the QR code 13 is irradiated. Here, since the symbol of the QR code 13 is formed by infrared coloring of the thermal layer 11b, it is clearly recognized by absorbing infrared light. Therefore, since the entire symbol of the QR code 13 can be recognized, the data recorded in the data cell can be read accurately.

  Further, when the optical reading form 10 is copied by a copying machine, the concealing layer 14 made of infrared non-absorbing ink is copied with toner, and is visually reproduced in a uniform black solid state. It is impossible to reproduce the symbol shape of the QR code 13 hidden under the symbol 14. Therefore, the optical reading form 10 after copying cannot clearly recognize the symbol shape of the QR code 13 even if the toner has some infrared light absorption characteristics. Accordingly, since the optical reading form 10 after copying cannot be read with the QR code reader, the data encoded in the QR code 13 can be easily determined, and the counterfeit using the copying machine can be easily determined. Can be reliably prevented.

  Further, in the present embodiment, the following modifications may be employed. The optical reading form 10 shown in FIG. 3 employs a QR code 18 made of an infrared light absorbing material in place of the QR code 13 by infrared coloring of the thermal layer 11b. This optical reading form 10 is made of, for example, IR ink (infrared drying ink), carbon on a base material 17 made of paper such as high-quality paper, recycled paper, coated paper, or a resin film such as polyester film or polypropylene film. The QR code 18 is printed with an infrared light absorbing ink, such as an ink containing a black pigment of the type or an ink added with an infrared light absorber as an auxiliary agent. In addition, the point which the protective layer 15 by the mat ink is provided in the whole surface of the base material 17, and the permeation | transmission prevention layer 16 by the light-shielding ink is provided in the back surface of the base material 17 is the same as that of the thing of FIG.

  The optical reading form 10 shown in FIG. 4 uses thermal paper 11 that develops infrared color on the base material, but the configuration of the concealing layer 19 formed on the thermal paper 11 is different. This concealing layer 19 uses a mixed ink obtained by adding a matting agent (a colorless pigment having a large particle diameter) to black ink that does not have infrared light absorption characteristics, and this mixed ink is printed on an optical reading code from above the thermal layer 11b. The print is limited to the area of column 12 (size of QR code 13). It is to be noted that the QR code 13 is constituted by infrared coloring of the thermal layer 11b, and the transmission preventing layer 16 made of light-shielding ink is provided on the back surface of the thermal paper 11 as in the case of FIG.

  The optical reading form 10 shown in FIG. 5 employs a QR code 18 made of an infrared light absorbing material as in FIG. 3, and a matting agent is applied to black ink that does not absorb infrared light as in FIG. The concealing layer 19 is printed with the added mixed ink. In addition, the point by which the permeation | blocking prevention layer 16 by light-shielding ink is provided in the back surface of the base material 17 is the same as that of the thing of FIG.

  According to the examples shown in FIGS. 3, 4 and 5, all are protective layers 15 in which mat ink is printed in the optical reading code printing column 12, or mixed ink in which a mat agent is added to black ink which does not absorb infrared light. Is provided. For this reason, even when the QR codes 13 and 18 are printed, even if they are affected by the thermal scrubbing of the thermal head, the print marks cannot be confirmed at all due to the unevenness of the protective layer 15 and the concealing layer 19 in the original mat state. Therefore, the QR codes 13 and 18 cannot be visually confirmed from above the protective layer 15 and the concealing layer 19, and duplication of the QR codes 13 and 18 can be prevented.

  For the same reason as described above, when the optical reading form 10 is copied by a copying machine, the encoded data cannot be recognized by the optical reading device. Therefore, it can be easily determined that the copy has been made, and forgery using a copy machine can be reliably prevented.

[Second Embodiment]
6 to 10 show a second embodiment of the present invention. As shown in FIG. 6, the optical reading form 20 of the present embodiment is characterized in that a protective layer 21 overprinted with ink resistant to thermal abrasion is provided on the concealing layer 14. As described above, when thermal printing is performed on the optical reading code printing column 12, the surface state of the hiding layer 14 is deformed due to thermal shrinkage due to the thermal rubbing of the thermal head, and the infrared non-absorbing ink of the hiding layer 14 is changed. It will be in an unattended state. Therefore, in the present embodiment, the protective layer 21 is formed by overprinting a transparent heat-resistant scrubbing ink over the entire surface of the concealing layer 14 so that the printed surface is not in a blank state. As an example of such a heat-resistant rubbing ink, UV ink: Z7011 (manufactured by JSR, trade name) can be used.

  In the present embodiment, the following modifications may be employed. The optical reading form 20 shown in FIG. 8 employs a QR code 18 made of an infrared light absorbing material in place of the QR code 13 of the thermal layer 11b by infrared coloring. This optical reading form 20 is made of, for example, IR ink (infrared drying ink), carbon on a base material 17 made of paper such as high-quality paper, recycled paper, coated paper, or a resin film such as polyester film or polypropylene film. The QR code 18 is printed with an infrared light absorbing ink, such as an ink containing a black pigment of the type or an ink added with an infrared light absorber as an auxiliary agent. The protective layer 21 made of heat-resistant rubbing ink is provided on the entire surface of the base material 17 and the permeation preventing layer 16 made of light-shielding ink is provided on the back surface of the base material 17 in the same manner as in FIG. is there.

  The optical reading form 20 shown in FIG. 9 uses thermal paper 11 that develops infrared color on the base material, but the configuration of the concealing layer 22 formed on the thermal paper 11 is different. This concealing layer 22 uses black heat-resistant rubbing ink having no infrared light absorption characteristics, and this ink is applied from above the thermal layer 11b to the region of the optical reading code printing column 12 (the size of the QR code 13). Limited edition printed. It is to be noted that the QR code 13 is constituted by the infrared coloration of the thermal layer 11b, and the transmission preventing layer 16 made of light-shielding ink is provided on the back surface of the thermal paper 11 as in the case of FIG.

  The optical reading form 20 shown in FIG. 10 employs a QR code 18 made of an infrared light absorbing material as in FIG. 8, and has a black heat-resistant rubbing that does not have infrared light absorption characteristics as in FIG. The concealing layer 22 is printed with a property ink. The point that the transmission preventing layer 16 with light-shielding ink is provided on the back surface of the substrate 17 is the same as that in FIG.

  According to the optical reading form 20 of the present embodiment, either the protective layer 21 printed with the heat-resistant rubbing ink or the black heat-resistant rubbing ink having no infrared light absorption property is printed on the optical reading code printing column 12. The concealing layer 22 is provided. For this reason, when the QR codes 13 and 18 are printed, the surface state of the protective layer 21 and the concealing layer 22 is not changed even under the influence of thermal rubbing of the thermal head. Therefore, the QR codes 13 and 18 cannot be visually recognized from above the protective layer 21 and the concealing layer 22, and the QR codes 13 and 18 can be prevented from being duplicated.

  For the same reason as described above, when the optical reading form 20 is copied by a copying machine, the encoded data cannot be recognized by the optical reading device. Therefore, it can be easily determined that the copy has been made, and forgery using a copy machine can be reliably prevented.

[Third Embodiment]
11 and 12 show a third embodiment of the present invention. As shown in FIG. 11, the optical reading form 30 of the present embodiment is printed on the optical reading code printing column 12 by a NIP (non-impact printer) so as to prevent unauthorized reading of the code due to the gloss unique to NIP. It is a thing. Normally, when printing with NIP, toner gloss and unevenness appear on the printing surface, and there is a possibility that the shape of printed characters and codes may be confirmed.

  Therefore, in this embodiment, as shown in FIG. 12, the QR code 31 is printed on the base material 17 with black toner having infrared light absorption characteristics, and the red color of the same color as the black toner is formed on the background of the QR code 31. The concealing layer 32 is printed with an external light non-absorbing material. In addition, the protective layer 33 is printed with a transparent toner, so-called clear toner, in a portion other than the QR code 31.

  According to the optical reading form 30 of the present embodiment, since the clear toner is used in the portion other than the optical reading code printing column 12, the toner gloss and unevenness appearing in the code portion of the QR code 31 are not noticeable. Therefore, the QR code 31 cannot be visually confirmed due to toner gloss or unevenness, and unauthorized reading or duplication of the QR code 31 can be prevented.

  In general, black toner having infrared light absorption characteristics is used. Instead, black toner without infrared light absorption characteristics is used to print around the QR code 31. You can go. In this case, it is not necessary to print the masking layer 32 having no infrared light absorption characteristics.

[Fourth Embodiment]
13 and 14 show a fourth embodiment of the present invention. As shown in FIG. 13, the optical reading form 40 of the present embodiment is characterized in that a determination code printing column 41 for authenticity determination is provided in addition to the optical reading code printing column 12. Normally, even when the optical reading code 18 is printed with black ink having infrared light absorption characteristics and the concealing layer 14 is printed with black ink having no infrared light absorption characteristics, the density in the visible light region is completely matched. It is impossible to make it happen. For this reason, if the image analysis is used, the optical reading code 18 can be read illegally due to the difference in light and shade, and there is a risk of forgery.

  Therefore, in this embodiment, a determination code printing column 41 for determining whether the form 40 is genuine or fake is provided next to the optical reading code printing column 12, and a determination code 42 is printed in this column. The determination code 42 is a QR code in this example, and is configured by directly printing on the thermal layer 11b with infrared light absorbing ink that is light in the visible light region, as shown in FIG. Further, in the determination code printing column 41, a concealing layer 43 is provided in order to conceal the printed determination code 42 from being visible from the outside. The masking layer 43 is made of black ink that does not absorb infrared light in a specific wavelength range, and is configured by covering and printing this ink so as to cover the determination code 42 from above the thermal layer 11b.

  When the optical reading form 40 of the present embodiment is used, the authenticity determination is performed by reading the determination code 42 in the determination code printing column 41 with an optical reading device (QR code reader).

  Here, the infrared light irradiated from the QR code reader passes through the concealing layer 43 made of infrared non-absorbing ink and is absorbed by the determination code 42 made of infrared light absorbing ink. As a result, if the determination code 42 is clearly recognized, and the determination code 42 is matched with the regular code, the QR code 13 printed in the optical reading code printing column 12 is determined to be genuine, and the data To read. On the other hand, if the recognized determination code 42 is not a regular code, or if the determination code 42 is not printed in the determination code printing field 41, the QR code printed in the optical reading code printing field 12 is not used. What is necessary is just to judge that 13 is a fake and not to read data.

  As described above, according to the optical reading form 40 of this embodiment, the authenticity determination is performed by reading the optical reading code printing column 12 for the first time by recognizing the determination code 42 using the optical reading device. did. Moreover, since the determination code 42 is printed using the light-colored infrared light absorbing ink in the visible light region, the difference between the light and dark in the determination code 42 and the concealing layer 43 becomes 0. It is impossible to read the determination code 42 using image analysis in the area. Therefore, the authenticity determination property of the optical reading form 40 can be improved.

  In addition, since the determination code printing column 41 is covered with the concealing layer 43 on the determination code 42, the determination code 42 cannot be confirmed at all other than infrared light, and the determination code 42 is printed. Even that is not recognized. Therefore, since this optical reading form 40 can be produced only by a person who knows the details, the anti-duplication property can be improved.

[Fifth Embodiment]
15 and 16 show a fifth embodiment of the present invention. As shown in FIG. 15, the optical reading form 50 of the present embodiment is characterized in that a pseudo code printing column 53 for deceiving a forger is provided separately from the optical reading code printing column 12. As described above, when the optical reading code 18 is printed with black ink having infrared light absorption characteristics and the masking layer 14 is printed with black ink having no infrared light absorption characteristics, the density of both in the visible light region is completely , The optical reading code 18 may be read illegally by image analysis.

  Therefore, in the present embodiment, a pseudo code printing field 53 for preventing forgery by copying is provided next to the optical reading code printing field 12, and a pseudo code 54 is printed in this field. The pseudo code 54 is a QR code in this example, and is configured by printing on the base material 17 with black ink having no infrared light absorption characteristic, as shown in FIG. The pseudo code 54 is an empty code in which no data is recorded, although it does not look like a normal QR code at all.

  On the other hand, the optical reading code printing column 12 includes an optical reading code 51 and a concealing layer 52. The optical reading code 51 is composed of the same type of QR code as the pseudo code 54, and in this example, is printed by printing with green ink having infrared light absorption characteristics on the base material 17. Further, on the background of the optical reading code (QR code) 51, a concealing layer 52 is printed on the base material 17 with green ink having the same color as the infrared light absorbing ink and having no infrared light absorbing property.

  The ink color of the optical reading code 51 and the concealing layer 52 is preferably the same color as the background color of the substrate 17. This is because the regular optical reading code printing column 12 becomes less conspicuous. Further, although the pseudo code 54 is printed with black ink having no infrared light absorption characteristics, a thermal layer (not shown) that does not develop infrared light may be printed by heating instead.

  When reading the data of the optical reading form 50 of the present embodiment, the infrared light irradiated from the optical reading device (QR code reader) is absorbed by the QR code 51 composed of green ink having infrared light absorption characteristics. The Thereby, since the symbol of the QR code 51 can be recognized, the data recorded in the data cell can be read.

  On the other hand, when the optical reading form 50 is copied by a copying machine, both the QR code 51 and the concealing layer 52 are copied with green toner, and the optical reading code printing column 12 is reproduced in a uniform solid state. Therefore, it is not known that the QR code 51 is hidden. Further, the pseudo code 54 is copied with black toner, and a code symbol is visually reproduced. However, even if this is read with a QR code reader, it cannot be read because no data is recorded. Therefore, the person who intends to copy the copy intends to copy the QR code (pseudo code) 54 by copying of the copier, but cannot actually use it, and why the copied QR code (pseudo code) 54 is used. I don't know why I can't read. Therefore, it is possible to reliably prevent duplication by the copying machine.

  Further, in this embodiment, the pseudo code printing field 53 is provided next to the optical reading code printing field 12, but when the pseudo code 54 is not provided with the same configuration as this, the optical reading code 12 becomes unclear visually. . That is, if there is no method for reading a predetermined position of a form, such as a method for reading a form fixed to the optical reading device or a method for reading the form by conveying it to the optical reading device, there is an optical reading code printing column 12 in any part. I do n’t know. However, according to the present embodiment, since the visible pseudo code 54 is provided next to the optical reading code printing column 12, the pseudo code 54 is used as a mark for reading the optical reading code (QR code) 51. Become. Therefore, since it is not influenced by the reading method of the optical reading device, there are the effects that the layout flexibility of the form is increased and the reading position can be clarified.

  As described above, in the above-described embodiment, the transmission preventing layer 16 is provided with the light-shielding ink on the back surface of the base material 11 or 17, but this is not an essential configuration. For example, by selecting a paper that does not easily see through with a lot of fillers and fillers, or a paper that has high whiteness and easily reflects light, it is not necessary to provide the transmission preventing layer 16 if the paper is not visible. In addition, although the QR code is adopted as an example of the optical reading codes 13, 1831, 51, the determination code 42, and the pseudo code 54, the present invention is not limited to this, for example, barcodes such as CODE39, CODE128, JAN, ITF, PDF417, data Other two-dimensional codes such as a matrix and MaxiCode may be adopted. That is, the present invention is not limited to the above-described embodiments, and many modifications can be made by the ordinary creation ability of those skilled in the art within the scope of the technical idea of the present invention.

[First Embodiment]
10 ... Optical reading form 11 ... Base material (thermal paper)
12 ... Optical reading code printing column 13 ... Optical reading code (infrared color)
14 ... Hiding layer (infrared light non-absorbing ink)
15 ... Protective layer (matte ink)
16 ... Transmission preventing layer (light-shielding ink)
17 ... Base material (paper, film)
18: Optical reading code (infrared light absorbing ink)
19: Hiding layer (mixed ink with matting agent added to infrared non-absorbing ink)
[Second Embodiment]
20 ... Optical reading form 21 ... Protective layer (heat-resistant rubbing ink)
22 ... Hiding layer (black heat-resistant rubbing ink not having infrared light absorption characteristics)
[Third Embodiment]
30: Optical reading form 31: Optical reading code (black toner having infrared light absorption characteristics)
32 ... Hiding layer (infrared light absorbing material of the same color as black toner)
33 ... Protective layer (clear toner)
[Fourth Embodiment]
40 ... Optical reading form 41 ... Determination code printing field 42 ... Determination code (infrared light absorbing ink of light color in visible light range)
43 ... Hiding layer (infrared light non-absorbing ink)
[Fifth Embodiment]
50: Optical reading form 51: Optical reading code (green ink having infrared light absorption characteristics)
52 ... Hiding layer (green ink without infrared light absorption)
53 ... Pseudo code printing field 54 ... Pseudo code (black ink without infrared light absorption characteristics)

Claims (7)

  On the printing surface of the base material, an optical reading code made of infrared coloring of the thermal layer or an optical reading code made of an infrared absorbing material, and a concealing layer made of an infrared non-absorbing material for concealing the optical reading code were provided. An optical reading form characterized by that.   The protective layer by mat ink is laminated | stacked on the masking layer, or the masking layer is comprised with the mixed ink which added the matting agent to the infrared-light non-absorbing ink. Optical reading form.   2. The optical reading form according to claim 1, wherein a protective layer made of heat-resistant rubbing ink is laminated on the masking layer, or the masking layer is made of heat-resistant rubbing ink.   The optical reading code is printed with an infrared light absorbing toner, and a concealing layer is printed on the background of the optical reading code with an infrared non-absorbing material of the same color as the infrared light absorbing toner. The optical reading form according to claim 1, wherein a protective layer is printed with clear toner.   The printing surface of the substrate further includes a determination code made of a light-colored infrared light absorbing material in the visible light region and a concealing layer made of an infrared light non-absorbing material for concealing the determination code. The optical reading form according to any one of claims 1 to 3.   The optical reading code is printed with an infrared light absorbing ink, and the same kind of optical reading code is used with a concealing layer printed on the background of the optical reading code with an infrared light non-absorbing ink of the same color as the infrared light absorbing ink. The optical reading form according to claim 1, wherein a pseudo code comprising the optical reading code is printed with an infrared non-absorbing ink.   The optical reading form according to any one of claims 1 to 6, wherein a non-transmission layer of light shielding ink is provided at a position corresponding to the optical reading code on the non-printing surface of the substrate. .

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