JP2023001220A - Member for information display medium, information display medium, booklet body, laminated body, related method, method of forming latent image corresponding to print image on laminated body, device thereof, and laminated body thereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated body or the like that is capable of further improving security property by displaying information recognizable under infrared rays and visible information on the same surface.

SOLUTION: The laminated body includes: a substrate layer; a first face side laser coloring layer that contains laser coloring agent and colors by being irradiated with laser light, and has at least one opening area; and a near infrared absorption layer that is formed on the first face of the substrate layer and includes infrared absorption ink composition that contains near infrared absorption material containing cesium tungstic oxide or lanthanum hexaboride. At least a part of the near infrared absorption layer is positioned in the opening area or the opening area and the near infrared absorption layer at least partly overlap.

SELECTED DRAWING: Figure 5

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present invention provides an information display medium member capable of printing or drawing (marking) characters, images, etc. that can be recognized by a near-infrared camera or the like, an information display medium comprising the information display medium member, and such an information display medium. It relates to a booklet containing as a sheet and a related method (aspect 1).
Furthermore, the present invention relates to a laminate capable of printing or drawing (marking) characters, images, etc. that can be recognized by a near-infrared camera or the like, a booklet containing such a laminate as a sheet, and a related method (aspect 2).
Furthermore, the present invention relates to a method for forming a latent image of an image such as a character, a pattern, or a photograph on a laminate having a near-infrared absorption layer, which cannot be confirmed by the naked eye but can be recognized by a near-infrared camera or the like (aspect 3 ).

(Background art related to aspects 1 and 2)
In recent years, it has become an issue to improve the security of data pages, ID (identification) cards such as identification cards, cards such as credit cards and cash cards, and banknotes. has been proposed.

Patent Document 1 proposes a marking method in which an infrared absorbing pattern is formed by applying energy such as laser light to a substrate containing ytterbium oxide. However, the infrared absorption of ytterbium oxide is not sufficiently high, and there is also a problem in terms of ease of handling.

In addition, as in Patent Documents 2 to 7, techniques such as anti-counterfeiting using an infrared absorbing material have been proposed, but problems remain in all techniques. For example, in Patent Document 2, variable variable information is printed by a printing method, and the following disadvantages exist:
- When printed or transferred on the card surface, it is easily tampered with, resulting in low security. Durability such as abrasion resistance also deteriorates.
・When printing or transferring to the middle layer of the card, after printing (or issuing) personal information, press processing and card size finishing processing are performed, so it is considered difficult to issue locally. Furthermore, if something goes wrong during the processing process, the personal information will be different, so you will have to start over from the first printing.

(Background technology related to aspect 3)
In recent years, it has become an issue to improve the security of sheet-shaped articles that require authenticity, such as data pages, ID (identification) cards such as identification cards, cards such as credit cards and cash cards, and banknotes. , various proposals have been made to prevent counterfeiting. For this reason, it has been proposed to perform marking by a method that is invisible to the naked eye but can be confirmed outside the range of visible light.

Patent Document 1 proposes a marking method in which an infrared absorbing pattern is formed by applying energy such as laser light to a substrate containing ytterbium oxide. In this way, by changing the absorption of infrared rays by irradiating laser light, image information such as characters and patterns that are difficult to recognize with a general camera or with the naked eye can be formed into a latent image on a laminate such as a card. The possibility of forming Patent Literature 8 also proposes an anti-counterfeiting technique using an infrared absorbing material of composite tungsten oxide. Here, laser light in the near-infrared region is normally used for marking. However, the infrared absorption of ytterbium oxide is not sufficiently high, there is a problem in terms of ease of handling, and practical latent image formation cannot be realized. Moreover, as for composite tungsten oxide, there has been no technique for changing the absorption of infrared rays by irradiating laser light. Therefore, there has been a demand for a method of using a material having appropriate near-infrared absorptivity, which can be changed by irradiation with laser light.

On the other hand, a laminate that can be marked with a near-infrared laser beam has a substrate layer in which a near-infrared absorbing layer formed using a near-infrared absorbing ink composition that reacts to near-infrared rays is laminated. There is. Here, when a latent image is formed by marking with laser light, if the layered body has visible color development, the image information to be the latent image becomes visible, and security cannot be maintained. However, when marking with a laser beam is performed at a high density, there is a possibility that the marked portion may become visible due to the deterioration of the base material layer of the laminate due to concentration of energy. Therefore, when forming a latent image by marking with laser light, the latent image must be reliably formed on the near-infrared absorption layer without causing the laminate to develop a color in the visible light region. However, there is no technology that specifies specific conditions for that purpose.

Patent No. 4323578 Japanese Patent Publication No. 2005-505444 JP 2005-246821 A JP 2008-162233 A Patent No. 6443597 Patent No. 6507096 Patent No. 6541400 Patent No. 6160830 Patent No. 5854329 WO2018/151238 Patent No. 6167803 Special Table No. 2006-518898

(Problem of Aspect 1)
In view of the above, the present invention provides an information display medium that can be used as an information medium for security such as ID cards and data pages, and has high security, is easy to determine authenticity, and/or simplifies the manufacturing process. It is an object of the present invention to provide an information display medium, an information display medium member that can be used for such an information display medium, a booklet containing such an information display medium as a sheet, and a related method.
(Problem of Aspect 2)
In view of the above, the present invention provides security by adding display of information that can be recognized mainly under infrared rays such as near-infrared rays, while maintaining the display of some information such as personal information by coloring such as black coloring. In particular, a laminate that can further improve security by displaying information recognizable under infrared rays on the same surface as visible information, and a booklet containing such a laminate as a sheet , and related methods.
(Problem of Aspect 3)
In view of the above, the present invention provides a method for forming a latent image of image information such as characters and patterns that are difficult to see on a laminate having a near-infrared absorption layer by laser light without causing color development in the visible light region. The task is to provide

(Aspect 1)
In order to solve the above problems, the present invention provides a member for an information display medium containing a transmissive material having visible light transmittance and near-infrared transmittance and a near-infrared absorptive material, the near-infrared absorptive material contains cesium tungsten oxide or lanthanum hexaboride, and by applying laser light to the target portion of the information display medium member, the near-infrared absorption of the target portion is reduced at least in a predetermined wavelength range. To provide an information display medium member.

Further, the present invention provides an information display medium comprising a base material portion and the information display medium member arranged through the base material portion.

The information display medium further comprises a laser coloring layer that contains a laser coloring agent and develops a color when irradiated with a laser beam, formed on at least one of the first surface side and the second surface side of the base material. The member for information display medium may be arranged so as to penetrate the base material portion and the laser coloring layer.

The information display medium further includes a printing layer containing a near-infrared transmitting colored ink composition or fluorescent ink composition formed on at least one of the first surface side and the second surface side of the base material. Be prepared.

The information display medium may further include a near-infrared transmitting hologram layer formed on at least one of the first surface side and the second surface side of the base member.

The information display medium is formed as the outermost layer on the first surface side of the base material portion and having visible light transparency and near-infrared transparency. A first-surface-side transmission layer and a visible-light-transmitting and near-infrared-transmitting layer formed as the outermost layer on the second surface side of the base member and on the second surface side of the information display medium. At least one of the second surface side transmission layer and the second surface side transmission layer may be further provided.

In the above information display medium, a plurality of A convex optical element portion may be formed.

The information display medium may further include a substrate intermediate layer, the substrate intermediate layer may include a first portion and a second portion, and the substrate portion may include a first substrate portion and a second substrate portion. and the first portion of the substrate intermediate layer may be located between the first substrate portion and the second substrate portion, the second portion of the substrate intermediate layer comprising the substrate It may be located at the edge of the intermediate layer and may not be located between the first substrate portion and the second substrate portion.

Alternatively, according to the present invention, there is provided a booklet comprising a plurality of sheets bound together, wherein at least one of the plurality of sheets is the information display medium, and the information display medium is the second portion of the substrate intermediate layer. to provide a booklet that is bound with the sheets of

In the booklet, the information display medium member may include a first partial information display portion that partially displays target information by a change in near-infrared absorption characteristics in the information display medium member, Of the other sheets included, the sheet of the page adjacent to the information display medium is the target due to changes in near-infrared absorption characteristics and visible light absorption characteristics formed on the surface of the adjacent page sheet on the information display medium side. A second partial information display section for partially displaying information may be included, and by synthesizing the information displayed in the first partial information display section and the information displayed in the second partial information display section, , subject information may be obtained.

In addition, the present invention provides a display device in which a region on the first surface side or the second surface side of the base material portion, in which the information display medium member is not arranged, displays information by a change in visible light absorption characteristics. Synthesizing the information displayed by the visible information display section, the information displayed by the first partial information display section, and the information displayed by the second partial information display section in the booklet including the information display section. The present invention provides a method characterized by determining the authenticity of an information display medium by comparing with information of a target obtained by the method.

Further, the present invention provides an information display medium member comprising a transmission layer having visible light permeability and near-infrared permeability, and a near-infrared absorption layer containing a near-infrared absorption ink composition containing a near-infrared absorption material. wherein the near-infrared absorptive material contains cesium tungsten oxide or lanthanum hexaboride, and by applying a laser beam to the target portion of the information display medium member, near-infrared rays in at least a predetermined wavelength range of the target portion Provided is a member for an information display medium characterized by reduced absorbency.

Further, the present invention includes a substrate portion, a transparent material having visible light permeability and near-infrared permeability, and a near-infrared absorbing material, and is disposed through the substrate portion for an information display medium. A member, wherein the near-infrared absorbing material is an information display medium comprising an information display medium member containing cesium tungsten oxide or lanthanum hexaboride. A method is provided, characterized in that the portion is lased to reduce near-infrared absorption in at least a predetermined wavelength range.

Further, the present invention includes a substrate portion, a transparent material having visible light permeability and near-infrared permeability, and a near-infrared absorbing material, and is disposed through the substrate portion for an information display medium. A member, wherein the near-infrared absorbing material includes an information display medium member containing cesium tungsten oxide or lanthanum hexaboride, and the information display medium member has near-infrared absorption characteristics in the information display medium member including a near-infrared information display portion that displays information by a change in the area on the first surface side or the second surface side of the base portion, where the information display medium member is not arranged, is visible It includes a visible information display part that displays information by changing light absorption characteristics, and the information displayed on the near-infrared information display part and the information displayed on the visible information display part are information related to the same object. An information display medium is provided.

Further, the present invention includes a substrate portion, a transparent material having visible light permeability and near-infrared permeability, and a near-infrared absorbing material, and is disposed through the substrate portion for an information display medium. A member, wherein the near-infrared absorbing material includes an information display medium member containing cesium tungsten oxide or lanthanum hexaboride, and the information display medium member has near-infrared absorption characteristics in the information display medium member including a near-infrared information display portion that displays information by a change in the area on the first surface side or the second surface side of the base portion, where the information display medium member is not arranged, is visible By comparing the display content of the near-infrared information display portion and the display content of the visible information display portion of the information display medium including the visible information display portion that displays information by changing the light absorption characteristics, the information display medium To provide a method characterized by authenticity determination.

(Aspect 2)
In order to solve the above problems, the present invention provides a substrate layer, and a first surface side laser coloring layer that contains a laser coloring agent and is formed on the first surface side of the substrate layer and develops a color when irradiated with a laser beam. and a near-infrared absorbing layer containing a near-infrared absorbing ink composition containing a near-infrared absorbing material formed on the first surface side of the base material layer, and the first surface side laser coloring layer comprises at least one At least a portion of the near-infrared absorbing layer is located in the opening region, or the opening region and the near-infrared absorbing layer at least partially overlap, and the near-infrared absorbing material is By irradiating a target portion of the near-infrared absorbing layer comprising cesium tungsten oxide or lanthanum hexaboride and located within or overlapping the aperture region, the target portion is exposed to at least a predetermined wavelength. Provided is a laminate characterized by reduced near-infrared absorption in the range.

The laminate may further include a first surface side printed layer containing a near-infrared transmitting colored ink composition or fluorescent ink composition, formed on the first surface side of the substrate layer.

The laminate may further include a near-infrared transmitting first surface hologram layer formed on the first surface side of the substrate layer.

At least a portion of the first surface side printed layer formed on the first surface side of the base material layer may overlap the near-infrared absorbing layer.

At least a portion of the first-surface-side hologram layer formed on the first-surface side of the substrate layer may overlap the near-infrared absorbing layer.

The laminate may further include a second surface side laser coloring layer which contains a laser coloring agent and is formed on the second surface side of the base material layer and which develops color when irradiated with a laser beam.

The laminate has a first surface having visible light permeability and near-infrared permeability, which is formed as the outermost layer on the first surface side of the laminate on the first surface side of the base layer. A side transmission layer may further be provided.

The laminate is a second surface having visible light permeability and near-infrared permeability, which is formed as the outermost layer on the second surface side of the laminate on the second surface side of the base layer. A side transmission layer may further be provided.

A plurality of convex optical element portions may be formed in an area at least partially overlapping with the near-infrared absorbing layer on the surface of the first surface-side transmissive layer opposite to the near-infrared absorbing layer.

The laminate may further include a substrate intermediate layer. The substrate intermediate layer may comprise a first portion and a second portion, the substrate layer may comprise a first substrate layer and a second substrate layer, the first portion of the substrate intermediate layer may be located between the first substrate layer and the second substrate layer, and the second portion of the substrate intermediate layer is located at the end of the substrate intermediate layer to separate the first substrate layer and the second substrate layer. It does not have to be positioned between the two substrate layers.

The present invention also provides a booklet comprising a plurality of sheets bound together, wherein at least one of the plurality of sheets is the above-described laminate, and the laminate comprises another sheet in the second portion of the intermediate layer of the base material. To provide a bound booklet.

In addition, the present invention includes a substrate layer, a first surface side laser coloring layer that contains a laser coloring agent and is formed on the first surface side of the substrate layer and develops color by applying laser light, and A near-infrared absorbing layer formed on the side of the first surface and containing a near-infrared absorbing ink composition containing a near-infrared absorbing material, wherein the near-infrared absorbing material contains cesium tungsten oxide or lanthanum hexaboride. , and a near-infrared absorption layer, the first surface side laser coloring layer has at least one opening region, and at least part of the near-infrared absorption layer is located in the opening region, or the opening region and In the laminate at least partially overlapping with the near-infrared absorbing layer, the near-infrared absorbing layer of the target portion located in the opening region or overlapping with the opening region, at least a predetermined wavelength of the target portion A method is provided, characterized by lasing to reduce near-infrared absorption in an area.

The present invention also provides a substrate layer and a first surface side laser coloring layer that contains a laser coloring agent and is formed on the first surface side of the substrate layer and that develops a color when exposed to laser light, The face-side laser coloring layer has at least one opening region, and includes a visible information display portion that displays information by changing visible light absorption characteristics in a region other than the opening region in the first face-side laser coloring layer. A first-surface-side laser coloring layer and a near-infrared absorbing layer containing a near-infrared absorbing ink composition containing a near-infrared absorbing material, formed on the first surface side of the substrate layer, wherein the near-infrared absorbing layer The optical material includes cesium tungsten oxide or lanthanum hexaboride, and at least a portion of the near-infrared absorbing layer is located within the opening region, or the opening region and the near-infrared absorbing layer at least partially overlap, and the opening is formed. Visible information of a laminate comprising a near-infrared absorbing layer that includes a near-infrared information display portion that displays information by changes in near-infrared absorption characteristics in a region located in the opening region or overlapping with the opening region Provided is a method for determining the authenticity of a laminate by comparing the display content of a display unit and the display content of a near-infrared information display unit.

(Aspect 3)
The present invention has been made in view of the above problems, and has the following features. That is, in the method of forming a latent image corresponding to a printed image on a laminate according to the present invention, the laminate comprises a substrate layer and near-infrared rays containing cesium tungsten oxide or lanthanum hexaboride as a near-infrared absorbing material. A near-infrared absorbing layer formed using an absorptive ink composition is provided, and the method includes a laser controlled based on information of the printed image so that the latent image of the printed image is formed. a laser scanning step of scanning the target area of the laminate while irradiating light, and the resolution when forming the latent image of the printed image is such that the base layer does not develop color in the visible light range, It is characterized in that the latent image can be formed by reducing near-infrared absorption in at least a predetermined wavelength range in the near-infrared absorption layer.

In the present invention, the laser scanning step may irradiate the laser light so as to form irradiation spots on the target area in a number per unit length corresponding to the resolution. In the present invention, the printed image is represented by pixels of the resolution, and the laser scanning step is performed on positions on the target area corresponding to each of the pixels based on the brightness information of the pixels. The target area may be scanned while being irradiated with the laser beam. In the present invention, the printed image may be obtained by reversing the contrast of the information of the image to be printed in monochrome. In the present invention, the resolution may range from 85dpi to 1000dpi. Also, in the present invention, the resolution may range from 140 dpi to 900 dpi. Moreover, in the present invention, the wavelength of the laser light can be in the near-infrared region. Moreover, in the present invention, the printed image may include letters, numbers, symbols, patterns, photographs, or any combination thereof. Moreover, in this invention, the said base material layer and the said near-infrared absorption layer can be formed as an integral layer.

Further, the present invention is also established as an apparatus for forming a latent image corresponding to a printed image on a laminate, wherein the laminate includes a substrate layer and cesium tungsten oxide or 6 as a near-infrared absorbing material. The apparatus comprises a near-infrared absorbing layer formed using a near-infrared absorbing ink composition containing lanthanum boride, and the apparatus includes supporting means for supporting the laminate, and the latent image of the printed image. laser scanning means for scanning a target area of the laminate while irradiating a laser beam controlled based on information of the printed image so as to form the latent image of the printed image; The resolution of is that the latent image can be formed by reducing the near-infrared absorption in the near-infrared absorption layer at least in a predetermined wavelength range without causing the base layer to develop a color in the visible light region. can do.

Further, the present invention is also established as a laminate on which a latent image corresponding to a printed image is formed, and the laminate includes a substrate layer and cesium tungsten oxide or lanthanum hexaboride as a near-infrared absorbing material. A near-infrared absorbing layer formed using a near-infrared absorbing ink composition is provided, and the latent image of the printed image is irradiated with a laser beam controlled based on the information of the printed image. It is formed by scanning an area, and the resolution when forming the latent image of the printed image is at least in a predetermined wavelength range in the near-infrared absorption layer without causing the base layer to develop color in the visible light region. The latent image can be formed by reducing near-infrared absorptivity.

(Effect of Aspect 1)
According to the present invention, it is possible to manufacture and use an information display medium that has high security and is easy to determine authenticity. According to one aspect of the present invention, by inserting a clear window containing a colorless infrared absorbing material in an information medium (ID card or data page) and changing the infrared absorption performance with a laser beam, the visible light of the information medium is changed. Variable invisible information that can be compared with information can be printed. Further, in the embodiment using the information display medium member containing the transmissive material and the near-infrared absorbing material, printing using the near-infrared absorbing ink composition becomes unnecessary, and the printing process can be reduced by one step. can. In such an embodiment, there is no concern about adhesion between resin layers compared to printing with ink, and there is no concern about blocking or other problems compared to providing a printing sheet on which ink is printed. Further, as one aspect of the present invention, if an identification card in the form of a booklet such as a passport is used, the security can be enhanced by visually recognizing adjacent pages together.

(Effect of Aspect 2)
According to the present invention, by providing an opening in the laser coloring layer and providing the near-infrared absorbing layer on the same surface, it is possible to avoid the influence of the laser coloring layer on the reflectance of the near-infrared absorbing layer. Security can be further improved by displaying external information on the same side as visible information.

(Effect of mode 3)
In the present invention, the resolution when scanning a target area of a laminate while irradiating a laser beam controlled based on the information of the printed image so as to form a latent image of the printed image is determined by setting the base layer to the visible light range. By adopting a configuration in which a latent image can be formed by reducing the near-infrared absorption in at least a predetermined wavelength range in the near-infrared absorption layer without causing color development, general It is possible to reliably form a latent image on the laminate that cannot be recognized by a simple camera or the naked eye, but can be visually recognized by using a near-infrared visualization device such as a near-infrared camera.

FIG. 4 is a view showing an observation image (visible light image) of the front surface of the laminate (an example of the information display medium) in the first embodiment of aspect 1 of the present invention under visible light. A diagram showing an observation image (near-infrared image) of the front surface of the laminate in the first embodiment of aspect 1 of the present invention by a near-infrared camera (the outline of the laminate is drawn for the purpose of making the figure easier to see. The same applies to other figures.). The back surface of the laminate in the first embodiment of aspect 1 of the present invention under visible light (the surface visible by rotating the laminate around the AX axis in FIG. 1 and turning it over. The same applies to other embodiments. .) is an observation image (visible light image). FIG. 2 is a diagram showing an image (near-infrared image) of the back surface of the laminate in the first embodiment of mode 1 of the present invention observed by a near-infrared camera (the outline of the laminate is drawn for the purpose of making the figure easier to see. FIG. The same applies to other figures.). An example of the layer structure when the laminate shown in FIG. 1 is viewed from the AA' cross section cut along the AA' line in FIG. (Each layer is drawn separately to show the layer structure. In addition, the colored ink layer (or fluorescent ink layer, hologram layer) 12 on the front side, the colored ink layer on the back side (or Fluorescent ink layer, hologram layer) 13 are not cut by line AA′, but are drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing the layer structure.). The figure which shows the observation image (visible light image) of the front surface by visible light of the laminated body in 2nd Embodiment of the aspect 1 of this invention. A diagram showing an observation image (near-infrared image) of the front surface of the laminate in the second embodiment of aspect 1 of the present invention with a near-infrared camera (the outline of the laminate is drawn for the purpose of making the figure easier to see) The same applies to other figures.). The back surface of the laminate in the second embodiment of aspect 1 of the present invention under visible light (the surface visible by rotating the laminate around the AX axis in FIG. 6 and turning it over. The same applies to other embodiments. .) is an observation image (visible light image). FIG. 10 is a diagram showing an image (near-infrared image) of the back surface of the laminate in the second embodiment of mode 1 of the present invention, observed by a near-infrared camera (the outer shape of the laminate is drawn for the purpose of making the figure easier to see. FIG. The same applies to other figures.). An example of the layer structure when the laminate shown in FIG. 6 is viewed from the BB' cross section cut along the BB' line in FIG. (Each layer is drawn separately to show the layer structure. In addition, the colored ink layer (or fluorescent ink layer, hologram layer) 12 on the front side, the colored ink layer on the back side (or Fluorescent ink layer and hologram layer) 13 are not cut by line BB', but are drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing layer structures.). A diagram showing an example of the manufacturing process of the laminate shown in FIGS. 6 to 10 (first process: temporary fixing treatment). FIG. 11 is a diagram showing an example of the manufacturing process of the laminate shown in FIGS. 6 to 10 (second process: window opening process); FIG. FIG. 11 is a diagram showing an example of the manufacturing process of the laminate shown in FIGS. 6 to 10 (third process: fitting process of the window member); A diagram showing an example of the manufacturing process of the laminate shown in FIGS. 6 to 10 (fourth process: press processing). FIG. 11 is a diagram showing an observation image (visible light image) of the booklet in the third embodiment of aspect 1 of the present invention under visible light; A view showing an image (near-infrared image) observed by a near-infrared camera of a booklet in the third embodiment of aspect 1 of the present invention (the outer shape of the laminate is drawn for the purpose of making the figure easier to see. The same applies to the figure.). FIG. 11 is a view showing an observation image (visible light image) of the booklet in the fourth embodiment of aspect 1 of the present invention under visible light; A view showing an image (near-infrared image) observed by a near-infrared camera of a booklet in the fourth embodiment of aspect 1 of the present invention (the outer shape of the laminate is drawn for the purpose of making the figure easier to see. The same applies to the figure.). The figure which shows the observation image (near-infrared image) by a near-infrared camera when the window member shown in FIG. 17 is seen independently. FIG. 10 is a diagram showing an observation image (visible light image) of the front surface of the laminate according to the fifth embodiment of aspect 1 of the present invention (the lenticular lens is transparent, but is drawn for the purpose of making the diagram easier to see). . FIG. 21 is a diagram showing a visible light image of the front surface of the laminate shown in FIG. 20 when viewed in the directions of arrows C and D in FIG. 25 described later; FIG. 21 is a diagram showing an observation image (near-infrared image) of the front surface of the laminate shown in FIG. 20 viewed with a near-infrared camera when viewed in the direction of arrow C in FIG. 25 to be described later. FIG. 21 is a diagram showing an observation image (near-infrared image) of the front surface of the laminate shown in FIG. 20, which is observed by a near-infrared camera when viewed in the direction of arrow D in FIG. An example of the layer structure when the laminate shown in FIG. 20 is viewed from the AA' cross section cut along the AA' line in FIG. (Each layer is drawn separately to show the layer structure. In addition, the colored ink layer (or fluorescent ink layer, hologram layer) 12 on the front side, the colored ink layer on the back side (or Fluorescent ink layer, hologram layer) 13 are not cut by line AA′, but are drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing the layer structure.). An example of the layer structure when the laminate shown in FIG. 20 is viewed from the BB' cross section cut along the BB' line in FIG. (Each layer is drawn separately to show the layer structure. In addition, the colored ink layer (or fluorescent ink layer, hologram layer) 12 on the back side, the colored ink layer (or fluorescent ink layer) on the back side , hologram layer) 13 are not cut by the line BB', but are drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing the layer structure.). FIG. 2 is a diagram conceptually explaining the principle of a lenticular; The figure which shows the observation image (visible light image) of the front surface of the laminated body in 6th Embodiment of the aspect 1 of this invention under visible light. A diagram showing an observation image (near-infrared image) of the front surface of the laminate in the sixth embodiment of aspect 1 of the present invention by a near-infrared camera (the outline of the laminate is drawn for the purpose of making the figure easier to see. The same applies to other figures.). An example of the layer structure when the laminate shown in FIG. 27 is viewed from the AA' cross section cut along the AA' line in FIG. (Each layer is drawn separately to show the layer structure. Also, the colored ink layer (or fluorescent ink layer, hologram layer) 12 on the front side is precisely AA' Although they are not cut by lines, they are drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing layer structures.). Layer structure of a modified example of the laminate in the first embodiment of aspect 1 of the present invention (similar to the first embodiment, it is an AA' cross section cut along the AA' line, and each layer is drawn separately Further, the colored ink layer (or fluorescent ink layer, hologram layer) 12 on the front side and the colored ink layer (or fluorescent ink layer, hologram layer) 13 on the back side are, to be precise, AA'. Although it is not cut by lines, it is drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing the layer structure.). A layer structure of a further modified example of the laminate in the first embodiment of aspect 1 of the present invention (similar to the first embodiment, it is an AA' cross section cut along the AA' line, and each layer is separated Further, the colored ink layer (or fluorescent ink layer, hologram layer) 12 on the front side and the colored ink layer (or fluorescent ink layer, hologram layer) 13 on the back side are, to be precise, A− Although not cut by the A' line, it is drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing the layer structure.). The figure which shows roughly the structure of a laser marker apparatus. FIG. 2 shows a near-infrared image of a cesium tungsten oxide-containing ink and an ytterbium oxide-containing ink observed with an infrared camera, and a near-infrared image of a printed matter obtained by offset printing them on a base material, observed with an infrared camera. Reflectance in the visible light region to the near-infrared region (before laser printing) and the printed surface of printed matter printed on offset printed materials using cesium tungsten oxide-containing inks on various substrates before laser printing. On the other hand, a graph showing the results of measuring the reflectance in the visible light region to the near infrared region (after laser printing) in the laser-printed area (showing the results of measuring the reflectance on the printed surface side (ink side) (The same is true for other graphs.) A graph showing measurement results when PC (polycarbonate) is used as the base material in the graph of FIG. 34 . A graph showing measurement results when PET-G (amorphous polyester) was used as the base material in the graph of FIG. 34. A graph extracting the measurement results when PVC (polyvinyl chloride) is used as the base material in the graph of FIG. Visible light region of the printed surface when offset printing is performed on high-quality paper as a base material using ink compositions with various contents of cesium tungsten oxide (expressed as a content percentage; unit is weight percent; weight percent) The graph which shows the result of having measured the reflectance of a near-infrared region. Reflectance (before laser printing) in the visible light region to the near-infrared region of the printed surface before laser printing in a printed matter obtained by offset printing using an ink containing lanthanum hexaboride on PC (polycarbonate) as a base material; 4 is a graph showing the results of measurement of reflectance (after laser printing) in the visible light region to the near-infrared region in a laser-printed region of a printed matter. The figure which shows the observation image (visible light image) of the front surface of the laminated body in 1st Embodiment of the aspect 2 of this invention under visible light. A diagram showing an observation image (near-infrared image) of the front surface of the laminate in the first embodiment of aspect 2 of the present invention by a near-infrared camera (the outline of the laminate is drawn for the purpose of making the figure easier to see) Also, the frame (broken line) of the opening region does not appear in the near-infrared image, but is shown for convenience (the same applies to other figures). The back surface of the laminate in the first embodiment of aspect 2 of the present invention under visible light (in FIG. 40, the surface visible by turning over by rotating the laminate around the AX axis. The same applies to other embodiments .) is an observation image (visible light image). FIG. 10 is a view showing an image (near-infrared image) of the back surface of the laminate in the first embodiment of aspect 2 of the present invention, observed by a near-infrared camera (the outline of the laminate is drawn for the purpose of making the figure easier to see. The same applies to other figures.). An example of the layer structure when the laminate shown in FIG. 1 is viewed from the AA' cross section cut along the AA' line in FIG. Schematic diagram (each layer is drawn separately to show the layer structure). An example of the layer structure when the laminate shown in FIG. 40 is viewed from the AA' cross section cut along the AA' line in FIG. FIG. 12 is a schematic diagram (each layer is drawn separately to show the layer structure) (modification 1 of the stacking order). An example of the layer structure when the laminate shown in FIG. 40 is viewed from the AA' cross section cut along the AA' line in FIG. FIG. 12 is a schematic diagram (each layer is drawn separately to show the layer structure) (modification 2 of the stacking order). An example of the layer structure when the laminate shown in FIG. 40 is viewed from the AA' cross section cut along the AA' line in FIG. 3A and 3B (each layer is drawn separately in order to show the layer structure) (Example 3 of change in stacking order). An example of the layer structure when the laminate shown in FIG. 40 is viewed from the AA' cross section cut along the AA' line in FIG. 10A and 10B (each layer is drawn separately to show the layer structure) (modification 4 of the stacking order). An example of the layer structure when the laminate shown in FIG. 40 is viewed from the AA' cross section cut along the AA' line in FIG. FIG. 12 is a schematic diagram (each layer is drawn separately to show the layer structure) (Example 5 of change in stacking order). An example of the layer structure when the laminate shown in FIG. 40 is viewed from the AA' cross section cut along the AA' line in FIG. (each layer is drawn separately to show the layer structure) (a laser coloring layer is added on the back side). FIG. 42 is a diagram showing microcharacters visible when part of the minute display printed image with near-infrared absorbing ink shown in FIG. 41 is enlarged (near-infrared image). Figure 41 shows microcharacters visible when part of the printed image with near-infrared absorbing ink and part of the human image generated by laser marking (laser drawing) are enlarged (near-infrared image ). The figure which shows the micro character produced|generated by the laser marking (laser printing) of the front surface of the laminated body in 2nd Embodiment of the aspect 2 of this invention (near-infrared image). The figure which shows the near-infrared image of the front surface of the laminated body in 3rd Embodiment of the aspect 2 of this invention. The figure which shows the observation image (visible light image) of the front surface by visible light of the laminated body in 4th Embodiment of the aspect 2 of this invention. A diagram showing an observation image (near-infrared image) of the front surface of the laminate in the fourth embodiment of aspect 2 of the present invention by a near-infrared camera (the outline of the laminate is drawn for the purpose of making the figure easier to see) Also, the frame (broken line) of the opening region does not appear in the near-infrared image, but is shown for convenience (the same applies to other figures). The back surface of the laminate in the fourth embodiment of aspect 2 of the present invention under visible light (in FIG. 55, the surface visible by turning over by rotating the laminate around the AX axis. The same applies to other embodiments .) is an observation image (visible light image). FIG. 10 is a view showing an image (near-infrared image) of the back surface of the laminate in the fourth embodiment of aspect 2 of the present invention observed with a near-infrared camera (the outline of the laminate is drawn for the purpose of making the figure easier to see. The same applies to other figures.). An example of the layer structure when the laminate shown in FIG. 55 is viewed from the BB' cross section cut along the BB' line in FIG. (Each layer is drawn separately to show the layer structure. In addition, the colored ink layer (or fluorescent ink layer, hologram layer) 12A on the back side is precisely cut along the BB' line. Although not shown, it is drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing the layer structure.). Another example of the layer structure when the laminate shown in FIG. 55 is viewed from the BB' cross section cut along the BB' line in FIG. (Each layer is drawn separately to show the layer structure. Also, the colored ink layer (or fluorescent ink layer, hologram layer) 12 on the back side is precisely BB' line , but is drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing the layer structure.). The figure which shows the booklet produced using the laminated body in 4th Embodiment of the aspect 2 of this invention (visible light image). The figure which shows the booklet produced using the laminated body in 4th Embodiment of the aspect 2 of this invention (near-infrared image). A diagram showing an observation image (near-infrared image) of the front surface of the laminate in the fifth embodiment of aspect 2 of the present invention by a near-infrared camera (the outline of the laminate is drawn for the purpose of making the figure easier to see) Also, the frame (broken line) of the opening region does not appear in the near-infrared image, but is shown for convenience (the same applies to other figures). A diagram showing an observation image (near-infrared image) of the front surface of the laminate in the sixth embodiment of aspect 2 of the present invention by a near-infrared camera (the outline of the laminate is drawn for the purpose of making the figure easier to see. Also, the frame (broken line) of the opening region does not appear in the near-infrared image, but is shown for convenience (the same applies to other figures). A diagram showing an observation image (near-infrared image) of the front surface of the laminate in the seventh embodiment of aspect 2 of the present invention by a near-infrared camera (the outline of the laminate is drawn for the purpose of making the figure easier to see) Also, the frame (broken line) of the opening region does not appear in the near-infrared image, but is shown for convenience (the same applies to other figures). An example of the layer structure of the laminate shown in FIG. 65 when looking at the BB' cross section cut along the BB' line in FIG. (Each layer is drawn separately to show the layer structure. In addition, the colored ink layer (or fluorescent ink layer, hologram layer) 12A on the back side is precisely cut along the BB' line. Although not shown, it is drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing the layer structure.). A diagram showing an observation image (near-infrared image) of the front surface of the laminate in the eighth embodiment of aspect 2 of the present invention by a near-infrared camera (the outline of the laminate is drawn for the purpose of making the figure easier to see. Also, the frame (broken line) of the opening region does not appear in the near-infrared image, but is shown for convenience (the same applies to other figures). An example of the layer structure when the laminate shown in FIG. 67 is viewed from the BB' cross section cut along the BB' line in FIG. (Each layer is drawn separately to show the layer structure. In addition, the colored ink layer (or fluorescent ink layer, hologram layer) 12A on the back side is precisely cut along the BB' line. Although not shown, it is drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing the layer structure.). FIG. 10 is a diagram showing an observation image (visible light image) of the front surface of the laminate in the ninth embodiment of aspect 2 of the present invention (the lenticular lens is transparent, but is drawn for the purpose of making the diagram easier to see). . FIG. 74 is a diagram showing a near-infrared image of the front surface of the laminate shown in FIG. 69 when viewed in the direction of arrow C in FIG. 73 described later; FIG. 74 is a diagram showing a near-infrared image of the front surface of the laminate shown in FIG. 69 when viewed in the direction of arrow D in FIG. 73 described later. An example of the layer structure when the laminate shown in FIG. 69 is viewed from the AA' cross section cut along the AA' line in FIG. (Each layer is drawn separately to show the layer structure. In addition, the colored ink layer (or fluorescent ink layer, hologram layer) 11A on the front side, the colored ink layer on the back side (or Fluorescent ink layer, hologram layer) 12A is not cut by line AA′, but is drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing layer structures.). An example of the layer structure when the laminate shown in FIG. 69 is viewed from the BB' cross section cut along the BB' line in FIG. (Each layer is drawn separately to show the layer structure. In addition, the colored ink layer (or fluorescent ink layer, hologram layer) 12A on the back side is precisely cut along the BB' line. Although not shown, it is drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing the layer structure.). FIG. 2 is a diagram conceptually explaining the principle of a lenticular; The figure which shows roughly the structure of a laser marker apparatus. The front view of the laminated body 100B used in embodiment of the aspect 3 of this invention. The front view shown by the observation image (visible light image) under visible light of the laminated body 100B used in embodiment of the aspect 3 of this invention. The front view shown by the observation image (near-infrared image) by the near-infrared camera of the laminated body 100B used in embodiment of the aspect 3 of this invention. The front view shown by the observation image (near-infrared image) by the near-infrared camera after laser marking of the laminated body 100B used in embodiment of the aspect 3 of this invention. FIG. 79 is an enlarged view of a part of the minute display printed image showing the micro characters by the near-infrared absorbing ink shown in FIG. 79 (near-infrared image). FIG. 77 is a diagram showing an example of the layer structure of the laminate 100B shown in FIG. 76, and is a cross-sectional view taken along the line AA' in FIG. 1; FIG. 77 is a diagram showing another example of the layer structure of the laminate 100B shown in FIG. 76; FIG. 2 is a schematic external view of a laser marker device 200B; A schematic block diagram of a laser marker device 200B. 4 is a conceptual diagram showing the relationship among spot distance SD, line width LW, and resolution R. FIG. FIG. 4 is a schematic operation flow diagram of the laser marker device 200B. FIG. 4 is a conceptual diagram for explaining the operation of scanning (high resolution) with near-infrared laser light. FIG. 4 is a conceptual diagram for explaining the operation of scanning with a near-infrared laser beam (middle resolution).

(Aspect 1)
Hereinafter, an information display medium member, an information display medium, a booklet, and a related method, which are exemplary embodiments of aspect 1 of the present invention, will be described with reference to the drawings. However, the information display medium member, information display medium, booklet, and related method according to aspect 1 of the present invention are not limited to the specific aspects described below, and are appropriately within the scope of aspect 1 of the present invention. Note that it can be changed. Individual functions, elements, etc. included in the embodiments described later can be deleted or changed as appropriate within the scope of aspect 1 of the present invention. It is also possible to add within the range of, and it is also possible to combine each embodiment appropriately. For example, in the following embodiments, a laminate in which a visually visible colored ink layer is printed on a transparent sheet will be described, but instead of or in addition to the colored ink layer, excitation light It is also possible to form a fluorescent ink layer or form a hologram layer by printing using a fluorescent ink composition that emits light when irradiated (at least one of a colored ink layer and a fluorescent ink layer is formed). A hologram layer may be formed on top, or only a hologram layer may be formed.), one or more of these layers may be formed on the substrate layer or the laser coloring layer. . A colored ink layer or the like may not be formed on the substrate, the laser coloring layer, or the transparent sheet. An IC module such as described in WO2018/151238 may be added. In addition, the information display medium taught by aspect 1 of the present invention means that information is already displayed by writing by laser marking or the like ("display" as visible information that can be recognized visually or by photographing with a visible light camera, or by a near-infrared camera It may be "displayed" as near-infrared information that can be recognized by photographing with, etc., or "displayed" as information that can be recognized in a manner other than these. It may be a medium for displaying information that does not have Further, the information display medium does not have to be a laminate, and may be a medium consisting of only one layer. As described in the embodiments below, it is not essential to form a near-infrared absorbing layer in aspect 1 of the present invention, but even if it is formed, a near-infrared absorbing layer (near-infrared absorbing ink layer) is not essential to be formed by offset printing, and can be formed by silk screen printing, gravure printing, flexographic printing, inkjet printing, etc. (it is not necessary to be microdisplay printing). The colored ink layer, fluorescent ink layer, hologram layer, etc. preferably have near-infrared transmittance to transmit at least a part of near-infrared rays among irradiated near-infrared rays. Not required. In the following embodiments, laminates in which oversheet layers (transparent sheets) are formed as the uppermost layer and the lowermost layer of the laminate will be described, but the provision of these oversheet layers is not essential. When forming the near-infrared absorbing ink layer, it is not essential to form it by printing, and even if the near-infrared absorbing ink layer and the colored ink layer are formed by the same method, they are formed by different methods. may have been Each layer and each element (the window member 5 and the lenticular lens 33 in FIG. 24, the clear window 40 and the near-infrared absorbing ink layer 41 in FIG. 31, etc.) drawn overlapping each other in each drawing showing the laminated structure are They may overlap partially but not completely, or may not overlap at all. Also, the lenticular lens 33 shown in FIGS. 24 and 25 may not be formed. In the examples described later, it is shown that it is particularly effective to use a near-infrared (line) laser beam as the laser beam. However, the laser light that can be used in Embodiment 1 of the present invention is not limited to this. That is, it is not essential to use near-infrared laser light from a near-infrared laser (e.g., Nd: YAG laser, YVO ₄ laser, fiber laser, etc.) as the laser light, but an ultraviolet laser (e.g., THG laser, etc.) or visible light. It is also possible to use laser light from a laser (eg, SHG laser, etc.), a far-infrared laser (eg, CO ₂ laser), or the like.

In the following embodiments, "near-infrared radiation" refers to electromagnetic waves having a wavelength of 780 nm to 2000 nm (according to "JIS Z 8117:2002 Far Infrared Terminology"). “Near-infrared laser light (near-infrared laser light)” is defined as laser light having a wavelength within the wavelength range of the near-infrared rays. Also, “visible light” is assumed to be an electromagnetic wave having a wavelength of 400 nm to 780 nm. Further, in the following embodiments, "near-infrared absorptivity" means the property of absorbing at least part of the irradiated near infrared rays, and "near-infrared permeability" means at least the irradiated near-infrared rays. It means the property of being partially permeable. Similarly, in the following embodiments, "visible light absorption" means the property of absorbing at least part of the irradiated visible light, and "visible light transmissive" means the property of absorbing visible light irradiated. It means the property of being at least partially permeable. Further, in the following embodiments, "laser marking" on an information display medium member (or near-infrared absorbing layer) such as a window member by a laser beam such as a near-infrared laser beam means an information display medium member (or By irradiating the near-infrared absorption layer) with laser light to change the absorption characteristics of the information display medium member (or near-infrared absorption layer) for near-infrared rays, some display content such as patterns, characters, and other information is drawn (or written) on the information display medium member (or near-infrared absorption layer). Furthermore, in the following embodiments, "laser marking" on the laser coloring layer with laser light such as near-infrared laser light means irradiating the laser coloring layer with laser light and visible light and near-infrared laser light. It means drawing (or writing) some display contents such as pictures, characters, and other information on the laser coloring layer by changing the absorption characteristics of the coloring layer. It should be noted that like reference numerals indicate like elements in different drawings unless otherwise noted.

(First embodiment)
FIG. 1 shows the visible light front surface of the laminate in the first embodiment of aspect 1 of the present invention (in FIG. 5, the outermost surface on the oversheet layer 14 side. Also in other figures Similarly) is a diagram showing an observation image (visible light image). In this embodiment and each subsequent embodiment, the laminated body 1 (an example of an information display medium) is a printed matter that identifies an individual such as an identification card, but is not limited to this, credit cards, cash cards, etc. An information display medium such as the laminate 1 can be produced as an arbitrary laminate such as cards, banknotes, etc., or other media. The laser coloring layers 10 and 11 are fused onto the substrate layer 9 (see FIG. 5 etc. described later) of the laminate 1 by heat press treatment. A person image 2 and person identification information 3 are drawn by laser marking that irradiates (These are laser marking that irradiates a near-infrared laser beam to the laser coloring layer 11. On the back side of the laminate 1 can be drawn). The person image 2 is drawn on the laser coloring layer 10 by irradiating a near-infrared laser beam so as to draw a person by laser marking. The person identification information 3 is drawn on the laser coloring layer 10 by irradiating a near-infrared laser beam so as to write in the person's identification information (name, personal identification number, etc.) by laser marking. The laser coloring layers 10 and 11 are formed as necessary, and either one of the laser coloring layers 10 and 11 may be formed, or the laminate 1 may be produced without forming either laser coloring layer. good too. Further, as shown in FIG. 5 to be described later, UV SOYBI SG yellow (manufactured by DIC graphics), UV SOYBI SG red (manufactured by DIC graphics), and UV SOYBI SG indigo (manufactured by DIC graphics) are applied on the oversheet layer 14. ), UV 161 yellow S (manufactured by T&K TOKA), UV 161 red S (manufactured by T&K TOKA), UV 161 indigo S (manufactured by T&K TOKA), etc. A mark 4 is printed using a colored ink layer 12 in FIG.

A window member 5 is arranged in the laminate 1 so as to penetrate the substrate layer 9 and the laser coloring layers 10 and 11 (see the layer structure in FIG. 5). The window member 5 is a solid member containing a transparent material having visible light permeability and near-infrared permeability and a near-infrared absorbing material. The transparent material is PVC (polyvinyl chloride), PET-G (amorphous polyester), PC (polycarbonate), PET (polyethylene terephthalate), PP (polypropylene), transparent resins, etc., and near-infrared absorbing materials include cesium tungsten oxide or lanthanum hexaboride. For example, PVC (polyvinyl chloride), PET-G (amorphous polyester), PC (polycarbonate), PET (polyethylene terephthalate), PP (polypropylene), and transparent resins in a liquid state melted by heating The window member 5 can be made by adding one or both of cesium tungsten oxide and lanthanum hexaboride to the material and mixing and molding into the shape of the window member 5 . The window member 5 preferably has a visible light transmittance of 50% or more and a near infrared transmittance of 50% or more, and preferably has a thickness (laminating direction) of about 300 μm to 700 μm. The window member 5 may be manufactured in an unsatisfactory manner.

Such a window member 5 has visible light transmittance and near-infrared transmittance, and also has a certain degree of near-infrared absorptivity by containing a near-infrared absorptive material. If the window member 5 is photographed by a camera or the like, a darker near-infrared image can be obtained than a member made of only a transparent material. In addition, as will be described later using experimental results, cesium tungsten oxide and lanthanum hexaboride have the property of reducing their absorption of near-infrared rays when irradiated with (near-infrared) laser light. By irradiating the window member 5 containing at least one of cesium tungsten oxide and lanthanum hexaboride with a near-infrared laser beam so as to draw (write) images, characters, etc. by laser marking, the drawn portion is The near-infrared absorption characteristics change, and this makes it possible to display on the window member 5 information such as images and characters that are at least difficult to recognize with the naked eye or a visible light camera, but can be recognized with a near-infrared camera or the like. can.

FIG. 2 is a diagram showing an observation image (near-infrared image) of the front surface of the laminate in the first embodiment of aspect 1 of the present invention by a near-infrared camera. The outline is drawn in. The same applies to other drawings.). Such an observed image can be obtained by observing with a near-infrared camera or the like. The person image 2 and the person identification information 3 drawn by laser marking on the laser coloring layer 10 have absorption properties for visible light and near-infrared rays, so they can be recognized not only by visible light but also by a near-infrared camera. On the other hand, since the mark 4 is formed by printing using a near-infrared transmissive colored ink, it cannot be recognized (or at least is difficult to recognize) by a near-infrared camera.

In FIG. 2, a near-infrared absorption image (within the window member, made of a near-infrared absorbing material) 6 and a person image (laser marking) 7 are shown in the window member 5 . The near-infrared absorption image 6 is due to the fact that the near-infrared image is displayed darker than the surroundings because the window member 5 contains a near-infrared absorbing material. The entire window member 5 shows a near-infrared image (near-infrared absorption image 6) darker than the surroundings. By irradiating the window member 5 with (near-infrared) laser light so as to draw a human image 7, the near-infrared absorption of the irradiated portion is reduced, and the near-infrared image is a human image. The portion 7 is displayed brighter than the surroundings (within the window member 5) (due to the decrease in near-infrared absorption, near-infrared rays emitted from a near-infrared camera or the like to the window member 5 and incident on the person image 7 portion However, when the light is reflected by some object on the back side of the laminate 1 and enters a near-infrared camera or the like, the light is displayed brightly as a near-infrared image), and a display as shown in FIG. 2 is obtained. In this way, when the window member 5 is viewed from above using a near-infrared camera or the like (the direction from the oversheet layer 15 to the oversheet layer 14 in the layer structure of FIG. 5 is defined as the "upward direction", The opposite direction is defined as "downward" (the same applies to other embodiments. See also FIG. 1. Here, the window member 5 is viewed from above the oversheet layer 14.), the near-infrared absorption image 6, , a human image 7 drawn by laser marking on the window member 5 can be recognized (FIG. 2). In the laser marking on the window member 5, in addition to the person image 7 or instead of the person image 7, person identification information similar to the person identification information 3 may be drawn (or written) by laser marking. Alternatively, some kind of microcharacters such as personal identification information similar to the personal identification information 3 may be drawn (or written) by laser marking, or some kind of micro display such as microscopic characters, symbols, and figures may be drawn. Both (and writing) are good. Furthermore, the person image 7 may be formed from minute display elements such as micro characters such as person identification information similar to the person identification information 3 . It should be noted that the term "micro-characters" as used herein is not limited to characters in units of μm (characters with a diameter, width, or height of less than 1 mm), but characters with a diameter, width, or height of 1 mm or more. They are sometimes called "microcharacters". The same applies to the sizes of other microdisplays. Similarly, in other embodiments, laser marking may draw (write) some kind of micro display such as micro characters.

FIG. 3 shows the back surface of the laminate in the first embodiment of aspect 1 of the present invention under visible light (the surface visible by rotating the laminate 1 around the AX axis in FIG. 1 and turning it over. FIG. 5 ). It is a view showing an observation image (visible light image) of the middle and outermost surfaces on the side of the oversheet layer 15. The same applies to other embodiments. Marks 8 are printed on the oversheet layer 15 using near-infrared transmitting colored ink (visible light absorbing colored ink) (colored ink layer 13 in FIG. 5).

FIG. 4 is a diagram showing an observation image (near-infrared image) of the back surface of the laminate in the first embodiment of aspect 1 of the present invention by a near-infrared camera. The same applies to other figures.). In the observation image, the near-infrared absorption image 6 and the person image 7 are reversed compared to when viewed from the front (FIG. 2).

As the near-infrared absorbing material to be contained in the window member 5, cesium tungsten oxide or lanthanum hexaboride can be used. As cesium tungsten oxide, cesium tungsten oxide represented by the chemical formula (general formula) Cs _x W _y O _z (x, y, z are positive real numbers) can be used. As an example, fine particles represented by Cs _0.33 WO ₃ having a hexagonal crystal structure described in Patent Document 8 (Japanese Patent No. 6160830) can be used. Fine particles represented by the chemical formula LaB ₆ can be used as lanthanum hexaboride. The content of cesium tungsten oxide in the window member 5 is arbitrary, but as shown in the examples below, the cesium tungsten oxide-containing ink contains 0.5% by weight (weight percent) to 6% by weight of cesium in one example. Having good properties in the tungsten oxide content, the cesium tungsten oxide content in the window member 5 may also be between 0.5 wt.% (weight percent) and 6 wt.%. The content of lanthanum hexaboride in the window member 5 is also arbitrary, and in one example may be 0.05% by weight (weight percent) to 6% by weight. Lanthanum-containing inks have good properties at a lanthanum hexaboride content of 0.3 wt%, so the lanthanum hexaboride content in the window member 5 may also be 0.3 wt%. Even when the window member 5 containing both cesium tungsten oxide and lanthanum hexaboride is used, the contents of cesium tungsten oxide and lanthanum hexaboride are similarly arbitrary. Here, the "content rate (% by weight) of tungsten cesium oxide" in the window member 5 is the ratio of the weight of tungsten cesium oxide contained in the window member 5 to the total weight of the window member 5. can be,
Content of tungsten cesium oxide in window member 5 (% by weight)={(weight of tungsten cesium oxide)/(weight of entire window member 5)}×100
is represented by
Similarly, the "lanthanum hexaboride content (% by weight)" in the window member 5 is the ratio of the weight of lanthanum hexaboride contained in the window member 5 to the total weight of the window member 5. ,
Content of lanthanum hexaboride in window member 5 (% by weight)={(weight of lanthanum hexaboride)/(whole weight of window member 5)}×100
is represented by

FIG. 5 is an example of the layer structure when the laminate shown in FIG. 1 is viewed from the AA' cross section cut along the AA' line in FIG. ) conceptually (each layer is drawn separately to show the layer structure. In addition, a colored ink layer (or fluorescent ink layer, hologram layer) 12 on the front side and a colored layer on the back side Strictly speaking, the ink layer (or fluorescent ink layer, hologram layer) 13 is not cut along the line AA', but is drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing the layer structure. ). The colored ink layer 12 may be formed between the substrate layer 9 and the laser coloring layer 10, and the colored ink layer 13 may be formed between the substrate layer 9 and the laser coloring layer 11. Well, the lamination order of other layers is arbitrary (the same applies to other embodiments).

The base material layer 9 is made of materials such as PVC (polyvinyl chloride), PET-G (copolyester), PC (polycarbonate), PET (polyethylene terephthalate), and PP (polypropylene). It is formed of a sheet-like base material (white sheet) with low infrared transmittance. When the oversheet layers 14 and 15 are not used, the base material layer 9 may be a paper base material (fine paper, cord paper, etc.) (Even when the oversheet layers 14 and 15 are used, the base material layer It is possible to use the above paper substrate as 9).

The laser coloring layers 10 and 11 are transparent sheet-like layers (similar to the oversheet layers 14 and 15 described later, which may be transparent resin or the like) containing a laser coloring agent, and are pressed against the substrate layer 9. is fused by The laser coloring layer 10 has the property of developing color when exposed to laser light. Since the portion of the laser coloring layer 10 irradiated with the laser light has a change in the absorption of visible light and near-infrared rays (in one example, the visible light absorption and the near-infrared absorption are increased, so that even with the naked eye, infrared rays Even when observed with a camera, it looks darker than other parts.), and the part can be recognized visually and by using a near-infrared camera. As the laser coloring agent, as described in Japanese Patent No. 6167803, for example, coloring agents such as dyes and pigments, clays, and the like can be used. Compounds, manganese violet, cobalt violet, metal compounds such as mercury, cobalt, copper, nickel, pearlescent pigments, silicon compounds, micas, kaolins, silica sand, diatomaceous earth, talc, titanium oxide-coated mica, tin dioxide coating One or more of mica, antimony-coated mica, tin+antimony-coated mica, tin+antimony+titanium oxide-coated mica, etc. can be used (Patent No. 6167803, paragraph [0043] ). At least a bismuth-based compound can be used as the color-developing material that develops color with a low-power laser, and the bismuth-based compound is not specifically limited, but examples include bismuth oxide, bismuth nitrate, and bismuth oxynitrate. bismuth nitrate, bismuth halide such as bismuth chloride, bismuth oxychloride, bismuth sulfate, bismuth acetate, bismuth citrate, bismuth hydroxide, and bismuth titanate. From the viewpoint that bismuth nitrate and bismuth hydroxide are preferably used, the bismuth-based compound may include one or more compounds, and includes at least a bismuth-based compound as an example. In addition to the color-developing material, a color-developing material other than the bismuth compound can be used together as long as it is a color-developing material that develops color with laser light (Patent No. 6167803, paragraph [0044]). Further, when using a color-developing material containing at least a bismuth-based compound as an example, a color-developing material that develops color with a laser beam and/or an inorganic compound can be used to increase the color-developing efficiency, and the inorganic compound is a metal oxide, The use of composite oxides or metal salts or compounds of one or more of them allows the inorganic compound to function as a coloring material in some cases even when irradiated with a low-power laser beam, and/or the inorganic compound. It is preferable to add an inorganic compound because it functions to increase the heat generation efficiency to help the color development of the color-developing material, or to increase the whiteness of the white ink containing the color-developing material and the white pigment (Patent No. 6167803 No., paragraph [0045]).

An oversheet layer (transparent sheet) 14 having visible light transmittance and near-infrared transmittance is formed on the top layer on the front side of the laminate 1, and the bottom layer on the back side of the laminate 1 has visible light transmittance and An oversheet layer (transparent sheet) 15 having near-infrared transmittance is formed. For the oversheet layers 14 and 15, for example, two sheets of transparent PC (polycarbonate) having a thickness of about 0.05 mm to 0.2 mm are prepared, and the bottom layer of the laminate 1 before the oversheet layers 14 and 15 are formed. The laminated body 1 can be formed by laminating each one on the uppermost layer and fusing them by applying heat and pressure. The oversheet layer is made of materials such as PVC (polyvinyl chloride), PET-G (copolyester), PC (polycarbonate), PET (polyethylene terephthalate), and PP (polypropylene), like the base layer. good. When the colored ink layer 12 (or fluorescent ink layer, hologram layer, etc.; the same applies to other descriptions) is formed on the oversheet layer 14, the oversheet layer 14 is formed before the oversheet layer 14 is laminated. , the colored ink layer 12 is formed in advance by printing with colored ink. When the colored ink layer 13 is formed on the oversheet layer 15, the colored ink layer 13 is formed by printing the oversheet layer 15 with colored ink in advance before lamination of the oversheet layer 15. . When the printed layer is formed on the oversheet layers 14 and 15, it is preferable to laminate the printed layer so that the printed layer is arranged on the base material layer 9 side in order to prevent tampering. Moreover, when there is an oversheet layer, the printed information is printed inside the laminate, which is more difficult to tamper with. As another example, the laminate 1 before forming the oversheet layers 14 and 15 is laminated from above and below with any two transparent films (if necessary, each film, base layer 9, laser coloring Either of the layers 10 and 11 is previously printed with colored ink, etc.), and the laminate 1 may be formed by bonding the layers with an adhesive. The same applies to the fusion bonding of the laser coloring layers 10 and 11 to the substrate layer 9 . As already mentioned, it is not essential to form the oversheet layers 14 and 15, and either one of the oversheet layers 14 and 15 may be formed, or the laminate may be formed without forming either oversheet layer. 1 may be made. Laser marking on the laser coloring layer 10 is performed from the uppermost layer side (oversheet layer 14 side) of the laminate 1 . Laser marking on the laser coloring layer 11 is performed from the bottom layer side (oversheet layer 15 side) of the laminate 1 .

A colored ink layer 12 is formed on the oversheet layer 14 (which may be on the laser coloring layer 10 or on the substrate layer 9; the same applies to the fluorescent ink layer 12 and the hologram layer 12). As already mentioned, the colored ink layer 12 is formed by printing the marks 4 on the oversheet layer 14 (or on the laser coloring layer 10) using a near-infrared transparent colored ink. Any method can be used to form the colored ink layer 12. For example, printing methods such as letterpress printing, offset printing, silk screen printing, gravure printing, flexographic printing, and inkjet printing, or other arbitrary forming methods can be used. In place of the colored ink layer 12 or in addition to the colored ink layer 12, UV fluorescent medium B (manufactured by T&K TOKA), UV fluorescent medium Y (manufactured by T&K TOKA), UV fluorescent medium R (manufactured by T&K TOKA), etc. The fluorescent ink layer 12 may be formed using near-infrared transparent fluorescent ink. The fluorescent ink layer 12 can be formed by performing printing or the like on the oversheet layer 14 in the same manner as the colored ink layer 12 using a fluorescent ink composition, and a mark or the like can be formed in the same manner as in the case of colored ink printing. can be printed. Alternatively, instead of the colored ink layer 12 and the fluorescent ink layer 12, or in addition to at least one of these layers, a near-infrared transmissive hologram layer 12 such as a transparent hologram may be formed. Even if the colored ink layer 12, the fluorescent ink layer 12, and the hologram layer 12 are formed on the front surface of the oversheet layer 14 (the surface opposite to the laser coloring layer 10), they can be formed on the back surface of the oversheet layer 14 (laser coloring layer 10). Whether it is formed on the surface of the laser coloring layer 10 (the surface on the side of the coloring layer 10) or on the front surface of the laser coloring layer 10 (the surface opposite to the base layer 9), the back surface of the laser coloring layer 10 (the base layer 9 side), the front surface of the substrate layer 9 (the laser coloring layer 10 side surface), or two or more of these surfaces. (Illustration is omitted as appropriate). Note that the colored ink layer 12, the fluorescent ink layer 12, and the hologram layer 12 do not need to have near-infrared transmittance. In the examples here, in order to simplify the diagram showing the observed image, the layers having near-infrared transmittance are standardized.

On the oversheet layer 15 (or on the laser coloring layer 11 or the substrate layer 9; the same applies to the fluorescent ink layer 13 and the hologram layer 13), a colored ink layer 13 (or a fluorescent ink layer, a hologram layer) is formed. Layers, etc. Materials and formation methods may be the same as those of the colored ink layer 12, fluorescent ink layer 12, and hologram layer 12. Two or more of these layers may be formed, and the same applies to other descriptions. ) is formed. Even if each of the colored ink layer 13, the fluorescent ink layer 13, and the hologram layer 13 is formed on the front surface of the oversheet layer 15 (the surface opposite to the substrate layer 9), the back surface of the oversheet layer 15 ( Whether formed on the front surface of the laser coloring layer 11 (the surface opposite to the base layer 9) or on the back surface of the laser coloring layer 11 (the surface on the side of the base material layer 9). layer 9 side), the back surface of the base material layer 9 (the laser coloring layer 11 side surface), or two or more of these surfaces (as appropriate). illustration is omitted).

As an example of a method for manufacturing the laminate 1 shown in FIGS. 1 to 5,
(1) The colored ink layer 12 (mark 4) is formed on the oversheet layer 14 by printing with colored ink, and the colored ink layer 13 (mark 8) is formed on the oversheet layer 15 by printing with colored ink. .
(2) Several points between the substrate layer 9 and the laser coloring layers 10 and 11 are fused by heat, and the portions where the window member 5 is to be formed are cut out in a temporarily fixed state.
(3) The window member 5 is fitted into the space created by cutting as described above.
(4) The above layers are laminated in the order shown in FIG. 5 and fused by press processing.
(5) Laser marking is performed on the laser coloring layer 10 from the surface of the obtained laminate on the oversheet layer 14 side, and the person image 2 and the person identification information 3 are drawn.
(6) Laser marking is performed on the window member 5 from the surface of the laminate on the oversheet layer 14 side or the surface on the oversheet layer 15 side, and a human image 7 is drawn.
The laminated body 1 can be produced by the method.

(Authentication method)
By comparing the visible light image and the near-infrared image of the laminate 1, the authenticity of the laminate 1 can be determined. Specifically, a person image 2 that can be recognized as a visible light image (including an image obtained by viewing with the naked eye; the same applies to other embodiments), and person identification information 3 (these can also be recognized as a near-infrared image) ) matches the person identified by the person image 7 that can be recognized as a near-infrared image, it can be determined that the laminate 1 is genuine as an identification card or the like, When the person specified by the person image 2 and person identification information 3 recognizable as a visible light image does not match the person specified by the person image 7 recognizable as a near-infrared image, the laminate 1 is used as an identification card. It can be determined that the card or the like is not genuine (is a counterfeit). Judgment may be performed by a person using a (near) infrared camera or the like, or a visible light image and a near infrared image are acquired by any optical analysis equipment, and both images are transferred to a computer using any data transfer device. , and a computer processor executes an image recognition/comparison program or the like to compare and judge both images (the same applies to other embodiments).

(Second embodiment)
FIG. 6 is a diagram showing an observation image (visible light image) of the front surface of the laminate in the second embodiment of aspect 1 of the present invention, using visible light, and FIG. A diagram showing an observation image (near-infrared image) of the front surface of the laminate in the second embodiment by a near-infrared camera (the outline of the laminate is drawn for the purpose of making the figure easier to see. ), and FIG. 8 shows the back surface of the laminate in the second embodiment of aspect 1 of the present invention under visible light (in FIG. 6, the laminate is turned over by rotating around the AX axis 9 is a diagram showing an observation image (visible light image) of the surface visible by the surface (the same applies to other embodiments), and FIG. 2 is a view showing an image (near-infrared image) of the back surface observed by 3D (the outer shape of the laminate is drawn for the purpose of making the figure easier to see. The same applies to other figures.). FIG. 10 shows an example of the layer structure of the laminate shown in FIG. 6 when viewed from the BB' cross section cut along the BB' line in FIG. ) conceptually (each layer is drawn separately to show the layer structure. In addition, a colored ink layer (or fluorescent ink layer, hologram layer) 12 on the front side and a colored layer on the back side Strictly speaking, the ink layer (or fluorescent ink layer, hologram layer) 13 is not cut by the BB' line, but is drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing the layer structure. ).

As a difference from the first embodiment described using FIGS. 1 to 5, as shown in FIG. 10, in the laminate 1 of the second embodiment, the base layers are the first base layer 18 and the second base (Materials and the like may be the same as those of the substrate layer 9. The substrate layer 9 shown in FIG. 5 and the like may also be composed of a plurality of sheets.) A substrate intermediate layer is provided as a layer sandwiched (at least partially) between the first substrate layer 18 and the second substrate layer 19 . The substrate intermediate layer first portion 17 is located between the first substrate layer 18 and the second substrate layer 19 , and the substrate intermediate layer second portion 16 is located between the first substrate layer 18 . and the second base material layer 19 . The second portion 16 of the base material intermediate layer is positioned at the end of the laminate 1 and can be used as a binding margin to produce a booklet by machine binding. In the layer structure of the second embodiment, the laser coloring layer on the back side corresponding to the laser coloring layer 11 in FIG. 5 is not used. It may be formed on either the side or the back side, may be formed on both, or may not be formed on either side.

Such a base material intermediate layer is formed by sandwiching (at least part of) the base material intermediate layer between the first base material layer 18 and the second base material layer 19 and performing a heat press treatment to form the first base material layer. 18 and the second base material layer 19 can be provided by fusion bonding. It may be provided by sticking to the first base material layer 18 and the second base material layer 19 using an adhesive. As the base material intermediate layer, a sheet made of any material such as paper, resin, cloth, non-woven fabric, etc. can be used. textiles.

As an example of a method for manufacturing the laminate 1 shown in FIGS. 6 to 10,
(1) The colored ink layer 12 (mark 4) is formed on the oversheet layer 14 by printing with colored ink, and the colored ink layer 13 (mark 8) is formed on the oversheet layer 15 by printing with colored ink. .
(2) The first substrate layer 18, the intermediate substrate layers (16, 17), the second substrate layer 19 and the laser coloring layer 10 are fused at several points by heat (FIG. 11), A through hole 20 is formed by cutting out a portion where the window member 5 is to be formed in the temporarily fixed state (FIG. 12).
(3) The window member 5 described above is fitted into the through hole 20 formed by cutting as described above (Fig. 13).
(4) The above layers are stacked in the order shown in FIG. 10 (FIG. 14) and fused by press processing.
(5) Laser marking is performed on the laser coloring layer 10 from the surface of the obtained laminate on the oversheet layer 14 side, and the person image 2 and the person identification information 3 are drawn.
(6) Laser marking is performed on the window member 5 from the surface of the laminate on the oversheet layer 14 side or the surface on the oversheet layer 15 side, and a human image 7 is drawn.
The laminated body 1 can be produced by the method.

(Authentication method)
By comparing the visible light image and the near-infrared image of the laminate 1, the authenticity of the laminate 1 can be determined. Specifically, a person is identified by a person image 2 that can be recognized as a visible light image and person identification information 3 (these can also be recognized as a near-infrared image), and a person is specified by a person image 7 that can be recognized as a near-infrared image. If the person matches, it can be determined that the laminate 1 is genuine as an identification card or the like, and the person image 2 and person identification information 3 that can be recognized as a visible light image (these can also be used as a near-infrared image). recognizable) does not match the person specified by the person image 7 recognizable as a near-infrared image, the laminate 1 is not genuine as an identification card or the like (it is a counterfeit). Yes) can be determined.

(Third Embodiment)
FIG. 15 is a diagram showing an observation image (visible light image) of the booklet in the third embodiment of aspect 1 of the present invention under visible light, and FIG. 16 is a diagram showing the third embodiment of aspect 1 of the present invention. 2 is a diagram showing an image (near-infrared image) observed by a near-infrared camera of the booklet in FIG. The layer structure of the laminate 1 included in the booklet shown in FIG. 15 when viewed along the BB' line in FIG. 15 is the same as the layer structure shown in FIG. can be

Similar to the laminate 1 described with reference to FIG. 6 and the like, the laminate 1 of FIG. 15 also includes substrate intermediate layers. ), the second base material layer 19, and the laser coloring layer 10 are partially cut out, and the window member 5 is provided in the resulting space.

Observing the laminate 1 under visible light, as shown in FIG. recognizing the mark 4 (colored ink layer, fluorescent ink layer, or hologram layer 12) formed by fluorescent ink printing or hologram (a combination of two or more of these may be used; the same applies to other embodiments); can be done. As will be described later, the surfaces of the separate sheets 23 and 24 of the booklet 100 on the laminate 1 side may be printed with near-infrared transparent colored ink, fluorescent ink, or hologram (a combination of two or more of these may be used.) 15 is formed on the surface of the laminate 1 side of the sheet 24 and the window visible through member 5). Moreover, it is not necessary to form both of the person images 22 and 21, and either one of them may be formed, or neither of them may be formed. In place of the person images 22 and 21 or in addition to the person images 22 and 21, at least one of the sheets 23 and 24 on the laminate 1 side has person identification information similar to the person identification information 3. It may be formed (the person image 22 or the person image 21 is formed on the surface of one of the sheets 23 and 24 on the side of the laminate 1, and on the surface of the other sheet 23 and 24 on the side of the laminate 1 Personal identification information similar to the personal identification information 3 may be formed, or personal identification information such as a name may be formed on the surface of the sheet 23 facing the laminated body 1, and the laminated body 1 side of the sheet 24 may be formed. may be formed with other personal identification information such as an ID number). It is also assumed that a mark 8 is formed as a colored ink layer, a fluorescent ink layer, or a hologram layer 13 on the back surface of the laminate 1 (the surface opposite to the mark 4) (similar to FIGS. 3 and 8). (not shown in the third embodiment).

Using the second portion 16 of the base material intermediate layer (protruding from between the first base material layer 18 and the second base material layer 19) as a binding margin, the laminate 1 (sheet) is formed into other sheets 23, 24. , 25, thereby forming the booklet 100. FIG. As already described, the sheets 23 and 24 have the person images 22 and 21 drawn by colored ink printing, fluorescent ink printing, or hologram. It is preferable to use a printer capable of variable printing such as toner and ribbon transfer. Also, on the window member 5 containing the near-infrared absorbing material, personal identification information 26 is written by laser marking as recognized as the near-infrared image of FIG. In addition, the person image 2 or person images similar to the person images 21 and 22 may be formed by laser marking the window member 5.). A person image 2 that can be recognized as a visible light image, person identification information 3 (these can also be recognized as a near-infrared image), person images 21 and 22, and person identification information 26 that can be recognized as a near-infrared image (display) are compared. Thus, the authenticity of the laminate 1 and the booklet 100 can be determined. In addition, in FIGS. 15 and 16, laser marking is performed on the front surface to form the person image 2 and the person identification information 3 on the front surface, but the laser coloring layer is formed on the back side of the base material. It may be provided (see laser coloring layer 11 in FIG. 5) or may be provided on both sides (see laser coloring layers 10 and 11 in FIG. 5). The person image 2 and the person identification information 3 may be formed on the back side of the laminate 1 by marking (even in this case, authenticity determination can be performed in the same manner. Laser marking is mainly used). The same applies to the other embodiments that it may be performed on either the front side or the back side, or on both sides).

As an example of a method for manufacturing the laminate 1 shown in FIGS. 15 and 16,
(1) The colored ink layer 12 (mark 4) is formed on the oversheet layer 14 by printing with colored ink, and the colored ink layer 13 (mark 8) is formed on the oversheet layer 15 by printing with colored ink. .
(2) The first substrate layer 18, the intermediate substrate layers (16, 17), the second substrate layer 19, and the laser coloring layer 10 are fused and temporarily fixed at several points by heat. , a portion where the window member 5 is to be formed is cut out to form a through hole 20 (see FIG. 12, not shown in the third embodiment).
(3) The window member 5 is fitted into the through hole 20 formed by cutting as described above.
(4) The above layers are stacked in the order shown in FIG. 10 and fused by press processing.
(5) Laser marking is performed on the laser coloring layer 10 from the surface of the obtained laminate on the oversheet layer 14 side, and the person image 2 and the person identification information 3 are drawn.
(6) Laser marking is performed on the window member 5 from the surface of the laminate on the oversheet layer 14 side or the surface on the oversheet layer 15 side to draw personal identification information 26 .
The laminated body 1 can be produced by the method. By binding this laminate with another sheet using the second portion 16 of the base material intermediate layer as a binding margin (the person image 22 is formed on the back surface of the sheet 23 by printing with colored ink or the like as described above). , the booklet 100 can be produced.

(Authentication method)
By comparing the visible light image and the near-infrared image of the laminate 1, authenticity determination of the laminate 1 (authentication determination of the booklet 100) can be performed. Specifically, a person image 2 that can be recognized as a visible light image, person identification information 3 (which can also be recognized as a near-infrared image), a person specified by the person images 21 and 22, and a person that can be recognized as a near-infrared image. If the person specified by the identification information 26 matches, the laminate 1 (or the booklet 100) is considered to be genuine as an identification card or the like (an example of the booklet 100 is a passport). A person image 2 that can be determined and recognized as a visible light image, person identification information 3 (these can also be recognized as a near-infrared image), persons specified by the person images 21 and 22, and person identification information that can be recognized as a near-infrared image If the person specified by 26 does not match, the laminated body 1 (or the booklet 100) is judged to be not authentic (fake) as an identification card or the like (as a booklet, a passport or the like). can. As described above, instead of or in addition to the person image (person identification information), it is also possible to form the person identification information (person image) by printing, laser marking, or the like. By comparing the recognizable person image (and/or person identification information) with the person identification information (and/or person image) recognizable as a near-infrared image, similar authenticity determination can be performed (other implementations The same applies to morphology).

(Fourth embodiment)
FIG. 17 is a diagram showing an observation image (visible light image) of the booklet in the fourth embodiment of aspect 1 of the present invention under visible light, and FIG. 18 is a diagram showing the fourth embodiment of aspect 1 of the present invention. It is a diagram showing an observation image (near-infrared image) of the booklet by a near-infrared camera (In addition, the outline of the laminate is drawn for the purpose of making the figure easier to see. The same applies to other figures.), 19 is a diagram showing an observation image (near-infrared image) by a near-infrared camera when the window member shown in FIG. 17 is viewed alone. The layer structure of the laminate 1 included in the booklet shown in FIG. 17 when viewed along the BB' line in FIG. 17 is the same as the layer structure shown in FIG. can be

Unlike the third embodiment, on the surfaces of the laminate 1 side of the sheets 23 and 24 adjacent to the laminate 1 of the fourth embodiment, ink (carbon black) having absorbability of visible light and near-infrared rays is applied. Partial portrait images 29 and 28 are drawn by printing using the contained black ink (hereinafter referred to as black ink) (the partial portrait image 28 shown in FIG. 17 is , printed on the surface of the sheet 24 on the laminate 1 side, which can be visually recognized through the window member 5 and recognized by an infrared camera). The black ink referred to in this embodiment may be any ink containing carbon black, or may be the black of the ink cartridge of a commercially available printer. Both of the partial human images 29 and 28 need not be formed, and either one or neither of them may be formed. Since it is a portrait image, it is preferable to use a printer capable of variable printing such as inkjet, toner, or ribbon transfer rather than ordinary offset printing or silk printing. Additionally, the substrate may be carbonized by laser marking to form partial human images 29,28. Further, the window member 5 containing the near-infrared absorbing material is laser-marked so as to depict a partial human image 30, as recognized as the near-infrared image of FIG. Since the window member 5 contains a near-infrared absorbing material, the near-infrared image before laser marking is darker than the surroundings, but the portion irradiated with the laser beam by laser marking absorbs near-infrared rays. Therefore, in the near-infrared image, the portion irradiated with the laser light becomes brighter than before the irradiation. Using such properties, a partial human image 30 as shown in FIG. 18 can be obtained as a near-infrared image by irradiating the background 31 of the human image (or human identification information) with a laser beam. (See FIG. 19).

Observing the laminate 1 under visible light, as shown in FIG. A mark 4 (colored ink layer, fluorescent ink layer, or hologram layer 12) formed by fluorescent ink printing or a hologram (a combination of two or more of these may be used; the same applies to other embodiments), and, as described above, Partial human images 29 and 28 are formed by black ink printing on the surfaces of the other sheets 23 and 24 of the booklet 100 on the laminate 1 side. It is also assumed that a mark 8 is formed as a colored ink layer, a fluorescent ink layer, or a hologram layer 13 on the back surface of the laminate 1 (the surface opposite to the mark 4) (similar to FIGS. 3 and 8). (not shown in the fourth embodiment).

Using the second portion 16 of the base material intermediate layer (protruding from between the first base material layer 18 and the second base material layer 19) as a binding margin, the laminate 1 (sheet) can be folded into other sheets 23, 24. , 25, thereby forming the booklet 100. FIG.

When the laminate 1 is observed with a near-infrared camera or the like, as shown in FIG. Also, the partial human image 30 can be recognized as a near-infrared image due to the near-infrared absorptivity of the near-infrared absorbing material contained in the window member 5 . Partial human images 28 and 29 made of black ink or the like and a partial human image 30 resulting from the near-infrared absorbing property of the near-infrared absorbing material contained in the window member 5 are combined (partially as a near-infrared image). (both full person images 28, 30 are displayed at the same time and/or both partial person images 29, 30 are displayed at the same time), the person image can be recognized as a composite image. A person image 2 that can be recognized as a visible light image, person identification information 3 (these can also be recognized as a near-infrared image), and a composite image that can only be partially recognized as a visible light image but completely recognized as a near-infrared image. (a person image that can be recognized by simultaneously displaying the partial person images 28 and 30 or/and a person image that can be recognized by simultaneously displaying the partial person images 29 and 30). Thus, the authenticity of the laminate 1 and the booklet 100 can be determined. The authenticity determination may be performed by creating a composite image as information obtained by synthesizing both partial person images by a computer or the like, or by a person using the partial person image 29 and the partial person image 30, Or/and the person image information may be obtained by recognizing the complete person image from the partial person image 28 and the partial person image 30 . Both of the partial portrait images 28 and 29 may be formed as shown in FIG. 17, etc., or only the partial portrait image 28 may be formed, or only the partial portrait image 29 may be formed. . In addition, in FIGS. 17 to 19, laser marking is performed on the front surface to form the person image 2 and the person identification information 3 on the front surface, but the laser coloring layer is formed on the back side of the base material. It may be provided (see laser coloring layer 11 in FIG. 5) or may be provided on both sides (see laser coloring layers 10 and 11 in FIG. 5). The person image 2 and the person identification information 3 may be formed on the back side of the laminate 1 by marking (even in this case, authenticity determination can be performed in the same manner. Laser marking is mainly used). The same applies to the other embodiments that it may be performed on either the front side or the back side, or on both sides). The composite image does not need to be a person's image, and may be information (name, ID number, etc.) that matches the person identification information 3. The composite image may be microcharacters (as described in the first embodiment, diameter, width, Alternatively, it may be a character having a height of 1 mm or more, or may be another micro display.

As an example of a method for manufacturing the laminate 1 shown in FIGS. 17 to 19,
(1) The colored ink layer 12 (mark 4) is formed on the oversheet layer 14 by printing with colored ink, and the colored ink layer 13 (mark 8) is formed on the oversheet layer 15 by printing with colored ink. .
(2) The first substrate layer 18, the intermediate substrate layers (16, 17), the second substrate layer 19, and the laser coloring layer 10 are fused and temporarily fixed at several points by heat. , a portion where the window member 5 is to be formed is cut out to form a through hole 20 (see FIG. 12, not shown in the fourth embodiment).
(3) The window member 5 is fitted into the through hole 20 formed by cutting as described above.
(4) The above layers are stacked in the order shown in FIG. 10 and fused by press processing.
(5) Laser marking is performed on the laser coloring layer 10 from the surface of the obtained laminate on the oversheet layer 14 side, and the person image 2 and the person identification information 3 are drawn.
(6) Laser marking is performed on the window member 5 from the surface of the laminate on the oversheet layer 15 side (referred to as the back surface), and the window member 5 is singly removed from the front surface (the surface on the oversheet 14 side). A portion of the background 31 (a portion other than the partial human image 30) is irradiated with laser light so that the partial human image 30 in FIG. 19 can be recognized when viewed as a near-infrared image.
The laminated body 1 can be produced by the method.
By binding this laminate with another sheet using the second portion 16 of the base material intermediate layer as a binding margin (a partial portrait image 29 is formed on the back surface of the sheet 23 by black ink printing or the like as described above). ), and the booklet 100 can be produced.

(Authentication method)
By comparing the visible light image and the near-infrared image of the laminate 1, authenticity determination of the laminate 1 (authentication determination of the booklet 100) can be performed. Specifically, a person image 2 that can be recognized as a visible light image, person identification information 3 (these can also be recognized as a near-infrared image) (that is, visible light information), and a visible light image that can only be partially recognized is a human image as a composite image that can be completely recognized as a near-infrared image (a human image that can be recognized by simultaneously displaying the partial human images 28 and 30 and/or the partial human images 29 and 30 are simultaneously displayed. When the person identified by the visible light information matches the person identified by the near-infrared information, the laminate 1 ( Alternatively, the booklet 100) can be determined to be authentic as an identification card or the like (an example of the booklet 100 is a passport), and a person specified by visible light information and a person specified by near-infrared information can be determined. do not match, it can be determined that the laminated body 1 (or the booklet 100) is not genuine as an identification card or the like (as a booklet, such as a passport).

(Fifth embodiment)
FIG. 20 is a diagram showing an observation image (visible light image) of the front surface of the laminate according to the fifth embodiment of aspect 1 of the present invention (the lenticular lens is transparent, but is drawn for the purpose of making the diagram easier to see). ), and FIG. 21 is a diagram showing a visible light image of the front surface of the laminate shown in FIG. 20 when viewed in the directions of arrows C and D in FIG. 22 is a view showing an image (near-infrared image) observed by a near-infrared camera on the front surface of the laminate shown in FIG. 20 when viewed in the direction of arrow C in FIG. FIG. 23 is a diagram showing an observation image (near-infrared image) of the front surface of the laminate shown in FIG. 20 by a near-infrared camera when viewed in the direction of arrow D in FIG. 25 described later. Further, FIG. 24 shows an example of the layer structure of the laminate shown in FIG. 20 when viewed along the AA' line in FIG. ) conceptually (each layer is drawn separately to show the layer structure. In addition, a colored ink layer (or fluorescent ink layer, hologram layer) 12 on the front side and a The colored ink layer (or fluorescent ink layer, hologram layer) 13 is not cut by line AA′, but is drawn for the purpose of making the layer structure easier to understand. ).

Unlike the first embodiment shown in FIG. 1 and the like, a lenticular lens 33 is formed in a region of the surface of the oversheet layer 14 opposite to the laser coloring layer 10 that at least partially overlaps with the window member 5 . The layer structure of FIG. 24 may be the same as the layer structure of FIG. 5 except that the lenticular lens 33 is formed.

FIG. 25 shows an example of the layer structure of the laminate shown in FIG. 20 when viewed from the BB' cross section cut along the BB' line in FIG. ) conceptually (each layer is drawn separately to show the layer structure. In addition, a colored ink layer (or fluorescent ink layer, hologram layer) 12 on the back side, a colored ink layer on the back side ( (or fluorescent ink layer, hologram layer) 13 is not cut by line BB', but is drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing layer structures.). . When the lenticular lens 33 as an example of the plurality of convex optical element portions is viewed from the direction shown in FIG. along) has a shape that appears to be lined up. In FIG. 25, 7 convex lens portions are drawn side by side in any of the lenticular lenses 33, but this is for the sake of convenience in simplifying the explanation of the structure of the lenticular lens. , the lenticular lens 33 can be formed to include a greater number of convex lens portions, for example, on the order of 100 convex lens portions. Alternatively, a smaller number of convex lens portions may be used, and in general, lenticular lens 33 may be formed to include any plurality of convex lens portions. As a method for forming the lenticular lenses 33 on the oversheet layer 14, the lenticular lenses 33 that have already been manufactured may be adhered to the oversheet layer 14 with an adhesive or the like, or the lenticular lenses 33 may be The oversheet layer 14 may be formed by heat and pressure so as to have a shape that functions as a base, or the lenticular lens 33 base material is formed on the oversheet layer 14 by a printing method and fixed by a method such as UV curing. may

When viewing (recognizing) a pattern, characters, etc. drawn by laser marking in an area at least partially overlapping with the lenticular lens 33 in the window member 5 as a near-infrared image using a near-infrared camera or the like, from which direction? You can see different displays (near-infrared images) depending on what you look at. First, as for the front surface, when viewed in the direction of arrow C in FIG. 25, the near infrared image shown in FIG. 22 can be recognized, and when viewed in the direction of arrow D in FIG. It can recognize infrared images. In the examples of FIGS. 22 and 23, laser marking is performed by irradiating near-infrared laser light in the direction (angle) of arrow C in FIG. 25 so that the person image 34 shown in FIG. Laser marking is performed by irradiating the background 31 portion with a laser beam and irradiating the near-infrared laser beam in the direction (angle) of the arrow D in FIG. A portion of the background 31 is irradiated with a laser beam so that it can be recognized as a display). 25, the person image 34 can be recognized by viewing the window member 5 from the direction of arrow C in FIG. The person identification information 35 can be recognized by viewing the member 5 using an infrared camera or the like. That is, by changing the observation angle, the latent pattern can be visually recognized, and near-infrared absorption MLI (Multiple Laser Image) is realized.

FIG. 26 is a diagram conceptually explaining the lenticular principle (it does not have to match the specific configuration described using FIGS. 20 to 25). When the window member 5 is viewed with a near-infrared camera or the like through the lenticular lens 33 from the first position P1, the patterns and the like drawn on the plurality of printing portions IM1 are combined to form a first image such as the person image 34. Display (picture) can be recognized. When the window member 5 is viewed from the second position P2 through the lenticular lens 33 by a near-infrared camera or the like, the patterns and the like drawn on the plurality of printing units IM2 are combined to form a second image such as the person identification information 35. display (characters) can be recognized.

As an example of a method for manufacturing the laminate 1 shown in FIGS. 20 to 25,
(1) The colored ink layer 12 (mark 4) is formed on the oversheet layer 14 by printing with colored ink, and the colored ink layer 13 (mark 8) is formed on the oversheet layer 15 by printing with colored ink. .
(2) Several points between the substrate layer 9 and the laser coloring layers 10 and 11 are fused by heat, and the portions where the window member 5 is to be formed are cut out in a temporarily fixed state.
(3) The window member 5 is fitted into the space created by cutting as described above.
(4) Laminate the above layers in the order shown in FIGS. 24 and 25, and fuse them by heat press treatment using a press plate with unevenness capable of forming a lenticular lens (along with fusing each layer, lenticular lens 33 is formed).
(5) Laser marking is performed on the laser coloring layer 10 from the surface of the obtained laminate on the oversheet layer 14 side, and the person image 2 and the person identification information 3 are drawn.
(6) The window member 5 is irradiated with a laser beam from the surface of the obtained laminate on the oversheet layer 14 side, and the person image 34 and the person identification information 35 are converted into near-infrared light according to the direction of observation as described above. In FIG. 25, the background 31 (see FIG. 22) of the person image 34 is irradiated with laser light from the direction of arrow C so that it can be selectively recognized as an image, and the background 31 of the person identification information 35 (see FIG. 22) is irradiated from the direction of arrow D. 23) is irradiated with a laser beam to perform laser marking.
The laminated body 1 can be produced by the method.

(Authentication method)
By comparing the visible light image and the near-infrared image of the laminate 1, the authenticity of the laminate 1 can be determined. Specifically, a person specified by a person image 2 and person identification information 3 that can be recognized as a visible light image (these can also be recognized as a near-infrared image), and a person image 34 and person identification information that can be recognized as a near-infrared image. 35 matches the person specified by 35, it can be determined that the laminate 1 is authentic as an identification card or the like, and the person image 2 and person identification information 3 that can be recognized as a visible light image (these are recognizable as a near-infrared image) does not match the person specified by the person image 34 and the person identification information 35 that can be recognized as a near-infrared image. etc., it can be judged that the product is not genuine (it is a counterfeit).

(Sixth embodiment)
FIG. 27 is a diagram showing an observation image (visible light image) of the front surface of the laminate in the sixth embodiment of aspect 1 of the present invention under visible light, and FIG. 28 is an image of aspect 1 of the present invention. A diagram showing an observation image (near-infrared image) of the front surface of the laminate in the sixth embodiment of the above by a near-infrared camera (the outline of the laminate is drawn for the purpose of making the figure easier to see. Other 29 is an example of the layer structure when the AA' section of the laminate shown in FIG. 27 is cut along the AA' line in FIG. Viewed from below in the space of the paper) (Each layer is drawn separately to show the layer structure. Also, the colored ink layer on the front side (or fluorescent ink layer, The hologram layer) 12 is not exactly cut by the line AA', but is drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing the layer structure.). The visible light image of the back surface of the laminate in FIG. 27 is the same as the visible light image of FIG. Similar to infrared images. As shown in FIG. 29, the laminate of the sixth embodiment does not have a laser coloring layer, but a person image 37 as visible light information and person identification information 38 are formed as a colored ink layer, a fluorescent ink layer, or a hologram layer 39. By forming it, it can be used for authenticity determination in substantially the same manner as the laminate of the first embodiment. For the person image 37 and person identification information 38, it is preferable to use a printer capable of variable printing such as inkjet, toner, or ribbon transfer, rather than ordinary offset printing or silk printing. It is also possible to print on the front surface after forming a laminate. In that case, it is preferable to apply OP varnish to protect the printed information.

As an example of a method for manufacturing the laminate 1 shown in FIGS. 27 to 29,
(1) A colored ink layer 39 (person image 37 and person identification information 38) and a colored ink layer 12 (mark 4) are formed on the oversheet layer 14 by printing using colored ink.
(2) In the substrate layer 9, a portion where the window member 5 is to be formed is cut out, and the window member 5 is fitted into the space created by the cutout.
(3) The above layers and the oversheet layer 15 are laminated in the order shown in FIG. 29 and fused together by press processing.
(4) Laser marking is performed on the window member 5 from the surface of the obtained laminate on the oversheet layer 14 side or the surface on the oversheet layer 15 side to draw a human image 7 .
The laminated body 1 can be produced by the method.

(Authentication method)
By comparing the visible light image and the near-infrared image of the laminate 1, the authenticity of the laminate 1 can be determined. Specifically, when the person specified by the person image 37 and person identification information 38 recognizable as a visible light image matches the person specified by the person image 7 recognizable as a near-infrared image, A person identified by a person image 37 and person identification information 38 recognizable as a visible light image, and a person identified by a person image 7 recognizable as a near-infrared image. If the person does not match, it can be determined that the laminated body 1 is not authentic as an identification card or the like (it is a counterfeit).

(Modification)
In the embodiments so far, the window member 5 has been described as containing a near-infrared absorbing material containing cesium tungsten oxide or lanthanum hexaboride. It is not essential, for example, instead of such a window member 5, a near-infrared absorbing ink layer is provided in the clear window using a visible light-transmitting and near-infrared transmitting clear window made of a solid transparent resin or the like. (In one example, a visible light-transmitting near-infrared absorbing ink containing cesium tungsten oxide or lanthanum hexaboride as described above is used for the visible light-transmitting and near-infrared transmitting first transparent resin sheet. After printing, a second transparent resin sheet with visible light transmission and near infrared transmission is laminated, fused to each other by press processing, and cut into a window shape, so that the middle layer has near infrared absorption. A clear window having an ink layer can be produced.Here, the first transparent resin sheet and the second transparent resin sheet may have the same thickness in the stacking direction (in this case, near-infrared The absorptive ink layer is located in the middle of the clear window), which may be different), and a near-infrared absorptive ink layer (in one example, the above-mentioned By printing with a visible light-transmitting near-infrared absorbing ink containing cesium tungsten oxide or lanthanum hexaboride), the same authenticity determination as the laminate 1 described so far A laminate that can be used can be produced, and if such a laminate is used, a booklet that can be used in the same manner as the booklet 100 described so far can be produced. Of course, the near-infrared absorbing ink layer is formed on the side of the oversheet layer 14 or 15 near the base material layer 9, aligned with the clear window, and arranged so as to overlap at least partially to produce a laminate. may

As an example, in the laminate of the first embodiment described with reference to FIG. ), PET (polyethylene terephthalate), PP (polypropylene), etc. using a clear window 40 made of a transparent material, and a near-infrared absorbing ink layer 41 is printed inside or on the clear window 40 by printing or the like. Layer structure of a laminate as a modification obtained by forming (similar to the first embodiment, it is an AA' cross section cut along the AA' line, and each layer is drawn separately. Although the colored ink layer (or fluorescent ink layer, hologram layer) 12 on the front side and the colored ink layer (or fluorescent ink layer, hologram layer) 13 on the back side are not cut by AA' line exactly, , are drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing the layer structure.) are conceptually shown in FIGS. In the laminate of FIG. 1 and the like, the person image 7 is drawn by performing laser marking on the window member 5, but in the modified examples of FIGS. By going there and drawing the person image 7, it is possible to produce a laminate as a modified example that can be used for authenticity determination similar to the laminate of the first embodiment.

As the near-infrared absorbing ink, a cesium tungsten oxide-containing ink composition or a lanthanum hexaboride-containing ink composition can be used. As the cesium tungsten oxide-containing ink composition, an ink containing cesium tungsten oxide represented by the chemical formula (general formula) Cs _x W _y O _z (x, y, z are positive real numbers) can be used. . As an example, an ink containing fine particles represented by Cs _0.33 WO ₃ having a hexagonal crystal structure, described in Patent Document 8 (Japanese Patent No. 6160830), can be used. As the lanthanum hexaboride-containing ink composition, an ink containing fine particles represented by the chemical formula LaB ₆ can be used. The near-infrared absorbing ink contains, in addition to cesium tungsten oxide or lanthanum hexaboride, dispersants, monomers, synthetic resins, auxiliaries, and the like. The content of cesium tungsten oxide in the cesium tungsten oxide-containing ink is arbitrary, but in one example, a content of 0.5% by weight (weight percent) to 6% by weight exhibits good characteristics in Examples described later. shown. The content of lanthanum hexaboride in the lanthanum hexaboride-containing ink is also arbitrary, and in one example may be from 0.05 wt% (weight percent) to 6 wt%, but at a content of 0.3 wt% Good properties are demonstrated in the examples below. Even when a near-infrared absorbing ink containing both cesium tungsten oxide and lanthanum hexaboride is used, the content of each of cesium tungsten oxide and lanthanum hexaboride is similarly arbitrary. In any case, the preferred content can be changed depending on the printing density (height) or the like. As used herein, the "content of tungsten cesium oxide (% by weight)" in the near-infrared absorbing ink is the ratio of the weight of tungsten cesium oxide contained in the ink to the total weight of the ink.
Content of cesium tungsten oxide in ink (% by weight) = {(weight of cesium tungsten oxide)/(weight of entire ink)} × 100
is represented by
Similarly, the "lanthanum hexaboride content (% by weight)" in the near-infrared absorbing ink is the ratio of the weight of lanthanum hexaboride contained in the ink to the total weight of the ink.
Content of lanthanum hexaboride in ink (% by weight)={(weight of lanthanum hexaboride)/(weight of entire ink)}×100
is represented by

As an example of a method for manufacturing the laminate 1 shown in FIGS. 30 and 31,
(1) The colored ink layer 12 (mark 4) is formed on the oversheet layer 14 by printing with colored ink, and the colored ink layer 13 (mark 8) is formed on the oversheet layer 15 by printing with colored ink. .
(2-1) As described above, the first transparent resin sheet is printed with a near-infrared absorbing ink, further laminated with another second transparent resin sheet, and fused together by press processing to form a window. The window members (40A, 40B, 41) containing the near-infrared absorbing ink layer in the middle layer are produced by cutting out the shape (in the case of FIG. 30), or
(2-2) As described above, a near-infrared absorbing ink layer 41 is formed on a transparent material by printing using near-infrared absorbing ink, and cut out in the shape of a clear window 40 (in the case of FIG. 31).
(3) The window members (40A, 40B, 41) or the clear window 40 are attached in a state of being temporarily fixed by fusing several points between the substrate layer 9 and the laser coloring layers 10, 11 by heat. Cut out the part to be formed.
(4) The window members (40A, 40B, 41) or the clear window 40 printed with near-infrared absorptive ink is fitted into the space created by cutting as described above.
(5) The above layers are stacked in the order shown in FIG. 30 or 31 and fused by press processing.
(6) Laser marking is performed on the laser coloring layer 10 from the surface of the obtained laminate on the oversheet layer 14 side, and the person image 2 and the person identification information 3 are drawn.
(7) Laser marking is performed on the near-infrared absorbing ink layer 41 from the surface of the laminate on the oversheet layer 14 side or the surface on the oversheet layer 15 side to draw a human image 7 .
The laminated body 1 can be produced by the method.

(Authentication method)
By comparing the visible light image and the near-infrared image of the laminate 1, the authenticity of the laminate 1 can be determined. Specifically, a person image 2 that can be recognized as a visible light image (including an image obtained by viewing with the naked eye; the same applies to other embodiments), and person identification information 3 (these can also be recognized as a near-infrared image) ) matches the person identified by the person image 7 that can be recognized as a near-infrared image, it can be determined that the laminate 1 is genuine as an identification card or the like, The person specified by the person image 2 and person identification information 3 recognizable as a visible light image (these can also be recognized as a near-infrared image) matches the person specified by the person image 7 recognizable as a near-infrared image. If not, it can be determined that the laminate 1 is not genuine as an identification card or the like (it is a counterfeit).

Also in any embodiment other than the first embodiment, a clear window 40 is used instead of the window member 5, and a near-infrared absorbing ink layer 41 is formed thereon (FIG. 31) or in its middle layer (FIG. 30). It is possible to implement it as a modified example after modifying to provide it.

FIG. 32 is a diagram schematically showing the configuration of a laser marker device for performing laser marking (drawing, printing, etc.) described above. The laser marker device 42 includes a control section 43, a storage section 44, a driving (scanning) section 45, a laser beam irradiation section 46, and the like. While the head of the laser light irradiation unit 46 is driven by the driving unit 45, the near-infrared laser light is irradiated from the head to the window member 5, the near-infrared absorbing layer, and the laser coloring layer 10 (or the laser coloring layer 11). As a result, the above-described laser marking is performed on the window member 5, the near-infrared absorbing layer (near-infrared absorbing ink layer 41), or the laser coloring layer 10 (or the laser coloring layer 11). In the operation of the laser marker device 42, a control unit 43 (a separate computer outside the laser marker device 42 is used as the control unit 43) is equipped with various control circuits such as a CPU or a built-in control circuit. ), which is a driving device equipped with a motor or the like, directs the window member 5, the near-infrared absorbing ink layer 41, or the laser coloring layers 10 and 11 as already described. While driving the head of the laser light irradiation unit 46 (moving (scanning) the head), the laser light irradiation unit 46 (in one example, a Nd:YAG laser that is a device for generating laser light with a laser wavelength of 1064 nm A laser beam irradiation device equipped with various devices for irradiating a target with a laser beam, such as a head.) A near-infrared laser beam (near-infrared (which may be an external laser beam). A storage unit 44 having a storage device such as a semiconductor memory or a magnetic disk stores characters, images, etc. to be drawn by laser marking, which are read by the control unit 43 as appropriate and used to control the operation of the laser marker device 42. Various data are stored, and the laser marker device 42 draws characters, images, etc. stored in the storage unit 44 on the window member, the near-infrared absorbing layer, or the laser coloring layer. Since there are many known laser marking devices, they will not be described in further detail here.

(Example of near-infrared absorbing ink)
Experimental results of various laminates (offset printed matter) produced using cesium tungsten oxide-containing ink and lanthanum hexaboride-containing ink as near-infrared absorbing inks that can be used in Embodiment 1 of the present invention are compared below. As an example, a description will be given while comparing with experimental results of offset printed matter produced using ink containing ytterbium oxide.

(Comparative example 1)
Ytterbium (III) oxide, 3N5 powder and an ink medium containing monomers, synthetic resins, and other non-infrared absorbing materials are mixed so that the weight ratio of ytterbium oxide to ink medium is 25:75, and oxidation is performed. An ink was prepared with a ytterbium content of 25% by weight. Using the ytterbium oxide-containing ink prepared in this manner, printing was performed on a partial area of the woodfree paper that was the substrate with an offset printing machine (offset printability tester IGT C1 (manufactured by IGT Testing Systems)). rice field. The resulting printed matter was used as the laminate of Comparative Example 1, and photographed with an infrared visualization device VSC8000 (manufactured by Foster and Freeman) with a filter that cuts off light with a wavelength of 925 nm or less attached to the camera lens of the device. .

(Example 1)
A dispersion containing cesium tungsten oxide Cs _0.33 WO ₃ and the same ink medium as in Comparative Example 1 containing monomers, synthetic resins, and other non-infrared absorbing materials were added to the weight of cesium tungsten oxide and all other components. An ink with a cesium tungsten oxide content of 2% by weight was prepared by mixing in a ratio of 2:98. Using the cesium tungsten oxide-containing ink prepared in this way, printing was performed on a partial area of the woodfree paper that was the substrate with an offset printing machine (offset printability tester IGT C1 (manufactured by IGT Testing Systems)). went. The resulting printed matter was used as the laminate of Example 1, and photographed with an infrared visualization device VSC8000 (manufactured by Foster and Freeman) with a filter that cuts off light with a wavelength of 925 nm or less attached to the camera lens of the device. .

Infrared photographs of the ytterbium oxide-containing ink and the cesium tungsten oxide-containing ink prepared in Comparative Example 1 and Example 1 were taken with the above-mentioned infrared camera, and the printed matter was offset-printed as described above using each ink. FIG. 33 shows an infrared photograph taken by the infrared camera. From the photographs of the inks, it can be understood that both the ytterbium oxide-containing ink and the cesium tungsten oxide-containing ink exhibit near-infrared absorptivity. I couldn't. On the other hand, in printed matters obtained by offset printing with ink containing cesium tungsten oxide, which has a low content, the difference in brightness between the unprinted area and the printed area can be visually recognized, and the printed area is near-infrared absorbing. was found to have

The above experimental results are summarized in the following table.

In the above table, "film thickness" is the film thickness of the ytterbium oxide-containing ink layer or the cesium tungsten oxide-containing ink layer formed by offset printing. It is a reference value assuming a typical film thickness to be formed. The film thickness formed by offset printing in each example described later is also estimated to be about 1 μm to about 3 μm. In addition, experiments were conducted under the same conditions such as print density for all the examples of Mode 1 in this specification, and theoretically, the film thicknesses are considered to be the same. In addition, the "infrared absorption rate" in Example 1 means the reflectance measured using a JASCO V-670 UV-visible near-infrared spectrophotometer (manufactured by JASCO Corporation) (the irradiated light is reflected on the surface of the printed matter. It is the ratio of the intensity of the reflected light from the surface of the target printed matter to the intensity of the reflected light from the reference base material surface (reference portion). (Absorptance (%)=100-Reflectance (%)).

Next, offset printing was performed on various substrate sheets using a near-infrared absorbing ink with a cesium tungsten oxide (Cs _0.33 WO ₃ ) content (content rate) of 2% by weight. Then, laser marking was performed using a laser marker device, and the reflectance of electromagnetic waves in the visible to near-infrared wavelength range was measured for the marked and non-marked portions. As in Example 1, the “reflectance” in the following examples is the ratio of the intensity of the reflected light when the irradiated light is reflected on the surface of the printed matter, and is the reference substrate surface ( It is the ratio of the intensity of the reflected light from the surface of the target printed matter to the intensity of the reflected light from the reference part) (obtained by measurement using a JASCO V-670 UV-visible near-infrared spectrophotometer (manufactured by JASCO Corporation) value.).
The “reflectance” in Example 1 above and Examples 2-11 below can be generally defined by the following equation.
Reflectance (%) of target portion (target surface)={(intensity of reflected light from target portion (target surface))/(intensity of reflected light from reference portion (reference surface))}×100

を用い、波長１０６４ｎｍのＮｄ：ＹＡＧレーザーによるレーザー光によって上記印刷面にレーザー印字を行った。 レーザー印字された部分の、波長４００ｎｍ～２０００ｎｍにおける可視光～近赤外線の反射率を、ＪＡＳＣＯ Ｖ－６７０ 紫外可視近赤外分光光度計（日本分光株式会社製）を用いて測定した。 (Example 2)
By mixing a dispersion containing cesium tungsten oxide Cs _0.33 WO ₃ with monomers, synthetic resins, auxiliaries, etc. so that the weight ratio of cesium tungsten oxide to all other components is 2:98. , an ink containing 2% by weight of cesium tungsten oxide was prepared. Using the cesium tungsten oxide-containing ink thus produced, printing was performed on a PC (polycarbonate) sheet as a base material by an offset printing machine (offset printability tester IGT C1 (manufactured by IGT Testing Systems)). . The resulting printed matter was used as the laminate of Example 2, and the reflectance of visible light to near infrared light at a wavelength of 400 nm to 2000 nm on the printed surface before laser printing was measured with a JASCO V-670 ultraviolet visible near infrared spectrophotometer (Japan Spectroscopy Co., Ltd.). Furthermore, as a laser marker device,

was used to perform laser printing on the printed surface with laser light from an Nd:YAG laser with a wavelength of 1064 nm. Visible to near-infrared reflectance at wavelengths of 400 nm to 2000 nm of the laser-printed portion was measured using a JASCO V-670 ultraviolet-visible-near-infrared spectrophotometer (manufactured by JASCO Corporation).

を用い、波長１０６４ｎｍのＮｄ：ＹＡＧレーザーによるレーザー光によって上記印刷面にレーザー印字を行った。 レーザー印字された部分の、波長４００ｎｍ～２０００ｎｍにおける可視光～近赤外線の反射率を、ＪＡＳＣＯ Ｖ－６７０ 紫外可視近赤外分光光度計（日本分光株式会社製）を用いて測定した。 (Example 3)
By mixing a dispersion containing cesium tungsten oxide Cs _0.33 WO ₃ with monomers, synthetic resins, auxiliaries, etc. so that the weight ratio of cesium tungsten oxide to all other components is 2:98. , an ink containing 2% by weight of cesium tungsten oxide was prepared. Using the cesium tungsten oxide-containing ink prepared in this manner, printing is performed on a PET-G (copolyester) sheet as a substrate by an offset printing machine (offset printability tester IGT C1 (manufactured by IGT Testing Systems)). did The obtained printed matter was used as the laminate of Example 3, and the reflectance of visible light to near infrared rays at a wavelength of 400 nm to 2000 nm on the printed surface before laser printing was measured with a JASCO V-670 ultraviolet visible near infrared spectrophotometer (Japan Spectroscopy Co., Ltd.). Furthermore, as a laser marker device,

was used to perform laser printing on the printed surface with laser light from an Nd:YAG laser with a wavelength of 1064 nm. Visible to near-infrared reflectance at wavelengths of 400 nm to 2000 nm of the laser-printed portion was measured using a JASCO V-670 ultraviolet-visible-near-infrared spectrophotometer (manufactured by JASCO Corporation).

を用い、波長１０６４ｎｍのＮｄ：ＹＡＧレーザーによるレーザー光によって上記印刷面にレーザー印字を行った。 レーザー印字された部分の、波長４００ｎｍ～２０００ｎｍにおける可視光～近赤外線の反射率を、ＪＡＳＣＯ Ｖ－６７０ 紫外可視近赤外分光光度計（日本分光株式会社製）を用いて測定した。 (Example 4)
By mixing a dispersion containing cesium tungsten oxide Cs _0.33 WO ₃ with monomers, synthetic resins, auxiliaries, etc. so that the weight ratio of cesium tungsten oxide to all other components is 2:98. , an ink containing 2% by weight of cesium tungsten oxide was prepared. Using the cesium tungsten oxide-containing ink prepared in this way, printing is performed on a PVC (polyvinyl chloride) sheet as a substrate by an offset printing machine (offset printability tester IGT C1 (manufactured by IGT Testing Systems)). went. The resulting printed matter was used as the laminate of Example 4, and the reflectance of visible light to near infrared rays at a wavelength of 400 nm to 2000 nm on the printed surface before laser printing was measured with a JASCO V-670 ultraviolet visible near infrared spectrophotometer (Japan Spectroscopy Co., Ltd.). Furthermore, as a laser marker device,

was used to perform laser printing on the printed surface with laser light from an Nd:YAG laser with a wavelength of 1064 nm. Visible to near-infrared reflectance at wavelengths of 400 nm to 2000 nm of the laser-printed portion was measured using a JASCO V-670 ultraviolet-visible-near-infrared spectrophotometer (manufactured by JASCO Corporation).

FIG. 34 shows the results of reflectance measurements performed in Examples 2 to 4 above. 35 shows the reflectance measurement results of Example 2, FIG. 36 shows the reflectance measurement results of Example 3, and the reflectance measurement results of Example 4 are shown in FIG. 37 are extracted from the graph of FIG. 34 and shown in FIG. In the graphs of FIGS. 34 to 37, the value on the horizontal axis is the wavelength (nm) of the electromagnetic wave, and the value on the vertical axis is the reflectance of the electromagnetic wave of the wavelength indicated by the value on the horizontal axis on the printed surface or laser-printed portion. (%).

As is clear from the graphs of FIGS. 34 to 37, laser printing increases the reflectance (decreases the absorptivity) in the near-infrared region, regardless of which base material is used. The width of the increase varies depending on the wavelength on the horizontal axis, but in the near infrared region of 780 nm to 2000 nm, the reflectance is increased by at least 5% or more, generally 10% to 15%, or more due to laser printing. Readable. As a general trend, the change in reflectance before and after laser printing in the visible light wavelength region is smaller than the change in reflectance before and after laser printing in the near-infrared region. It is thought that it is possible to draw characters, images, etc., which are relatively difficult to see with a typical camera.

Next, six types of near-infrared absorption having mutually different cesium tungsten oxide (Cs _0.33 WO ₃ ) contents (contents) of 0.5% to 6% by weight were applied to woodfree paper as a base sheet. Offset printing was performed using a polar ink, and the reflectance of electromagnetic waves in the visible to near-infrared wavelength region of the printed surface (near-infrared absorbing ink layer) of each printed matter was measured. The definition of reflectance and the equipment used for reflectance measurement are the same as those in Examples 1 to 4 described above.

(Examples 5-10)
A dispersion liquid containing cesium tungsten oxide Cs _0.33 WO ₃ , monomers, synthetic resins, auxiliaries, etc., is prepared so that the weight ratio of cesium tungsten oxide to all other components is:
(Example 5) 0.5:99.5
(Example 6) 1:99
(Example 7) 1.3: 98.7
(Example 8) 2:98
(Example 9) 3:97
(Example 10) 6:94
Six types of ink with a cesium tungsten oxide content of 0.5% by weight to 6% by weight were prepared by mixing so as to obtain the following values. Using each of the cesium tungsten oxide-containing inks prepared in this manner, the above high-quality paper sheet, which is the substrate, is subjected to an offset printing machine (offset printability tester IGT C1 (manufactured by IGT Testing Systems)). was printed by The resulting six types of printed matter were used as laminates of Examples 5 to 10, and the reflectance of visible light to near infrared light at wavelengths of 400 nm to 2000 nm was measured using a JASCO V-670 ultraviolet-visible near-infrared spectrophotometer (Jasco Corp. (manufactured).

FIG. 38 shows the results of reflectance measurements performed in Examples 5 to 10 above. In the graph of FIG. 38, the value on the horizontal axis is the wavelength (nm) of the electromagnetic wave, and the value on the vertical axis is the reflectance (%) of the electromagnetic wave of the wavelength indicated by the value on the horizontal axis on the printed surface. It can be seen that, at least in the near-infrared wavelength region, the reflectance at the same wavelength decreases as the content of tungsten cesium oxide increases. A similar tendency can be read in the visible light wavelength range. That is, as the content of cesium tungsten oxide in the ink is increased, the image or the like printed by offset printing using the ink becomes easier to recognize using a near-infrared camera or the like. Since the rate is also low, the possibility of being visible with the naked eye or a general camera increases, and it is considered preferable to select an appropriate content of cesium tungsten oxide from the viewpoint of security.

Next, offset printing was performed on PC (polycarbonate) as a base material sheet using a near-infrared absorbing ink having a lanthanum hexaboride (LaB ₆ ) content (content rate) of 0.3% by weight. Laser marking was performed on the printed matter using a laser marker device, and the reflectance of electromagnetic waves in the visible to near-infrared wavelength range was measured for the marked and non-marked portions. Also in this embodiment, the reflectance is the ratio of the intensity of the reflected light when the irradiated light is reflected on the surface of the printed material, and It is the ratio of the intensity of reflected light from the surface of the target printed material (value obtained by measurement using a JASCO V-670 UV-visible-near-infrared spectrophotometer (manufactured by JASCO Corporation)).

を用い、波長１０６４ｎｍのＮｄ：ＹＡＧレーザーによるレーザー光によって上記印刷面にレーザー印字を行った。 レーザー印字された部分の、波長４００ｎｍ～２０００ｎｍにおける可視光～近赤外線の反射率を、ＪＡＳＣＯ Ｖ－６７０ 紫外可視近赤外分光光度計（日本分光株式会社製）を用いて測定した。 (Example 11)
A dispersion liquid containing lanthanum hexaboride (LaB ₆ ), monomers, synthetic resins, auxiliaries, etc. were mixed so that the weight ratio of lanthanum hexaboride to all other components was 0.3:99.7. An ink having a lanthanum hexaboride content of 0.3% by weight was prepared by mixing so that the contents were equal to each other. Using the lanthanum hexaboride-containing ink thus produced, printing was performed on a PC (polycarbonate) sheet as a substrate by an offset printing machine (offset printability tester IGT C1 (manufactured by IGT Testing Systems)). rice field. The resulting printed matter was used as the laminate of Example 11, and the reflectance of visible light to near infrared rays at a wavelength of 400 nm to 2000 nm on the printed surface before laser printing was measured with a JASCO V-670 ultraviolet visible near infrared spectrophotometer (Japan Spectroscopy Co., Ltd.). Furthermore, as a laser marker device,

was used to perform laser printing on the printed surface with laser light from an Nd:YAG laser with a wavelength of 1064 nm. Visible to near-infrared reflectance at wavelengths of 400 nm to 2000 nm of the laser-printed portion was measured using a JASCO V-670 ultraviolet-visible-near-infrared spectrophotometer (manufactured by JASCO Corporation).

FIG. 39 shows the results of reflectance measurement performed in Example 11 above. In the graph of FIG. 39, the value on the horizontal axis is the wavelength (nm) of the electromagnetic wave, and the value on the vertical axis is the reflectance (%) of the electromagnetic wave of the wavelength indicated by the value on the horizontal axis on the printed surface or laser-printed portion. is.

As is clear from the graph of FIG. 39, laser printing increases the reflectance (decreases the absorptivity) in the near-infrared region. Although the amount of increase varies depending on the wavelength on the horizontal axis, it can be seen that the reflectance increases by approximately 5% to 14% in the near-infrared region of 780 nm to 1400 nm due to laser printing. As an overall trend, the change in reflectance before and after laser printing in the visible light wavelength range is smaller than the change in reflectance before and after laser printing in the near-infrared region of about 800 nm to 1200 nm. Therefore, it is thought that characters, images, etc., which are relatively difficult to see with the naked eye or with a general camera, can be drawn.

(Example of use)
In one example, the laminate in each of the above-described embodiments and examples can be used as a printed matter such as an identification card with high security. In FIG. 1, a person image 2 drawn by laser marking, person identification information 3 (visible with the naked eye), a person image 7 drawn by laser marking on a window member containing a near-infrared absorbing material (infrared camera, etc.) by comparing the person (visible information) indicated by the person image 2 and person identification information 3 with the person indicated by the person image 7 (infrared information). Authenticity determination of certificates, etc. (If they match, it can be determined that the ID card, etc. is genuine, and if they do not match, it can be determined that the ID card, etc. is not genuine.) ), which can be detected if it is forged. The pattern drawn by the laser may be not only monotonous patterns such as bar codes, numbers, and two-dimensional codes, but also human images and the like as described above. In addition, by combining security technology for minute display printing such as microcharacters, the security of infrared absorbing printed matter can be further improved.

(Aspect 2)
Hereinafter, a laminate, a booklet, and a related method, which are exemplary embodiments of aspect 2 of the present invention, will be described with reference to the drawings. However, it should be noted that the laminate, booklet, and related methods according to aspect 2 of the present invention are not limited to the specific aspects described below, and can be appropriately modified within the scope of aspect 2 of the present invention. do. Individual functions, elements, etc. included in the embodiments described later can be deleted or changed as appropriate within the scope of aspect 2 of the present invention. It is also possible to add within the range of, and it is also possible to combine each embodiment appropriately. For example, in the following embodiments, a laminate in which a visually visible colored ink layer is printed on a transparent sheet will be described, but instead of or in addition to the colored ink layer, excitation light It is also possible to form a fluorescent ink layer or form a hologram layer by printing using a fluorescent ink composition that emits light when irradiated (at least one of a colored ink layer and a fluorescent ink layer is formed). A hologram layer may be formed on top, or only a hologram layer may be formed.), one or more of these layers may be formed on the substrate layer or the laser coloring layer. . A colored ink layer or the like may not be formed on the substrate, the laser coloring layer, or the transparent sheet. An IC module such as described in WO2018/151238 may be added. In addition, the laminate taught by aspect 2 of the present invention means that information is already displayed by writing by laser marking ("display" as visible information that can be recognized visually or by photographing with a visible light camera, or with a near-infrared camera, etc. It may be "displayed" as near-infrared information that can be recognized by photographing with a laser, or "displayed" as information that can be recognized in a manner other than these. It may be a laminate for information display that does not have a layer, or a laminate for another use. It is not essential to form the near-infrared absorption layer (near-infrared absorption ink layer) by offset printing, and it is also possible to form by silk screen printing, gravure printing, flexo printing, inkjet printing, etc. (micro display printing does not have to be). The colored ink layer, fluorescent ink layer, hologram layer, etc. preferably have near-infrared transmittance to transmit at least a part of near-infrared rays among irradiated near-infrared rays. Not required. In the following embodiments, laminates in which oversheet layers (transparent sheets) are formed as the uppermost layer and the lowermost layer of the laminate will be described, but the provision of these oversheet layers is not essential. When forming the near-infrared absorbing ink layer, it is not essential to form it by printing, and even if the near-infrared absorbing ink layer and the colored ink layer are formed by the same method, they are formed by different methods. may have been Each layer and each element (colored ink layer, fluorescent ink layer, or hologram layer 11A and near-infrared absorbing ink in FIGS. Layer 13A, aperture region 10AA, colored ink layer and fluorescent ink layer in FIG. 66, or hologram layer 11A and near-infrared absorbing ink layer 13A, aperture regions 10AA and 10BA, colored ink layer and fluorescent ink in FIG. Layer (or hologram layer 11A, near-infrared absorbing ink layers 13AA, 13BA, opening area 10AA, lenticular lens 31A in FIGS. 72 and 73, near-infrared absorbing ink layer 13A, opening area 10AA, etc.) They may overlap partially but not completely, or may not overlap at all. Also, the lenticular lens 31A shown in FIGS. 72 and 73 may be formed on the back surface side, or may be formed on both the front and back sides, or, of course, the lenticular lens may not be formed at all. In the examples described later, it is shown that it is particularly effective to use a near-infrared (line) laser beam as the laser beam. However, the laser light that can be used in aspect 2 of the present invention is not limited to this. That is, it is not essential to use near-infrared laser light from a near-infrared laser (e.g., Nd: YAG laser, _YVO4 laser, fiber laser, etc.) as the laser light, and ultraviolet laser (e.g., THG laser, etc.) or visible light. It is also possible to use laser light from a laser (eg, SHG laser, etc.), far-infrared laser (eg, CO ₂ laser), or the like.

In the following embodiments, "near-infrared radiation" refers to electromagnetic waves having a wavelength of 780 nm to 2000 nm (according to "JIS Z 8117:2002 Far Infrared Terminology"). “Near-infrared laser light (near-infrared laser light)” is defined as laser light having a wavelength within the wavelength range of the near-infrared rays. Also, “visible light” is assumed to be an electromagnetic wave having a wavelength of 400 nm to 780 nm. Further, in the following embodiments, "near-infrared absorptivity" means the property of absorbing at least part of the irradiated near infrared rays, and "near-infrared permeability" means at least the irradiated near-infrared rays. It means the property of being partially permeable. Similarly, in the following embodiments, "visible light absorption" means the property of absorbing at least part of the irradiated visible light, and "visible light transmissive" means the property of absorbing visible light irradiated. It means the property of being at least partially permeable. Further, in the following embodiments, the term "laser marking" on the near-infrared absorbing layer with a laser beam such as a near-infrared laser beam means that the near-infrared absorbing layer is irradiated with a laser beam to the near-infrared absorbing layer. By changing the absorption characteristics of the near-infrared absorption layer, it means to draw (or write) some display content such as patterns, characters, and other information on the near-infrared absorption layer. Furthermore, in the following embodiments, "laser marking" on the laser coloring layer with laser light such as near-infrared laser light means irradiating the laser coloring layer with laser light and visible light and near-infrared laser light. It means drawing (or writing) some display contents such as pictures, characters, and other information on the laser coloring layer by changing the absorption characteristics of the coloring layer. It should be noted that like reference numerals indicate like elements in different drawings unless otherwise noted.

(First embodiment)
FIG. 40 shows the front surface of the laminate in the first embodiment of aspect 2 of the present invention by visible light (in FIG. 44, it is the outermost surface on the side of the oversheet layer 14A. Also in other figures Similarly) is a diagram showing an observation image (visible light image). In this embodiment and each subsequent embodiment, the laminated body 1A is a printed matter such as an identification card that identifies an individual. A laminate 1A can be produced as an arbitrary laminate. A laser coloring layer 10A is fused onto the substrate layer 9A (see FIG. 44 etc. described later) of the laminate 1A by heat press treatment, and a part of the laser coloring layer 10A is cut out. Aperture regions 10AA are provided by . A person image 2A and person identification information 3A are drawn by laser marking by irradiating a near-infrared laser beam on the laser coloring layer 10A (these are placed on the back side of the laser coloring layer 16A as shown in FIG. 50, which will be described later). may be provided on the rear surface side of the laminate 1A by laser marking that irradiates the laser coloring layer 16A with a near-infrared laser beam). The person image 2A is drawn on the laser coloring layer 10A by irradiating a near-infrared laser beam so as to draw a person by laser marking. The person identification information 3A is drawn on the laser coloring layer 10A by irradiating a near-infrared laser beam so as to write the person's identification information (name, personal identification number, etc.) by laser marking. Further, as shown in FIG. 44 to be described later, UV SOYBI SG yellow (manufactured by DIC Graphics), UV SOYBI SG red (manufactured by DIC Graphics), UV SOYBI SG indigo (manufactured by DIC Graphics) are applied on the oversheet layer 14A. ), UV 161 yellow S (manufactured by T&K TOKA), UV 161 red S (manufactured by T&K TOKA), UV 161 indigo S (manufactured by T&K TOKA), etc. A mark 4A is printed using a colored ink layer 11A in FIG.

FIG. 41 is a diagram showing an observation image (near-infrared image) of the front surface of the laminate in the first embodiment of aspect 2 of the present invention by a near-infrared camera (for the purpose of making the diagram easier to see, the laminate The frame (broken line) of the opening area does not appear in the near-infrared image, but is shown for convenience.The same applies to other figures.). Such an observed image can be obtained by observing with a near-infrared camera or the like. The person image 2A and the person identification information 3A drawn by laser marking on the laser coloring layer 10A absorb visible light and near-infrared rays, so they can be recognized not only by visible light but also by a near-infrared camera. On the other hand, since the mark 4A is formed by printing using a near-infrared transparent colored ink, it cannot be recognized (or at least is difficult to recognize) depending on the near-infrared camera.

In addition, in the observed image in FIG. 41, a printed image 5A is printed on the substrate layer 9A using a near-infrared absorbing ink containing at least one of cesium tungsten oxide and lanthanum hexaboride, which are near-infrared absorbing materials. It is formed by printing on the oversheet layer 14A (see FIG. 44) (near-infrared absorbing ink layer 13A). Here, is at least part of the near-infrared absorbing layer 13A positioned within the opening area 10AA (see FIG. 44. In this case, at least part of the near-infrared absorbing ink layer 13A enters the opening area 10AA). Alternatively, the opening region 10AA and the near-infrared absorption layer 13A are at least partially overlapped (see FIG. 46, which will be described later).In this case, at least a portion of the colored ink layer 11A enters the opening region 10AA, Absorbent ink layer 13A at least partially overlaps.).

As described later with experimental results, a near-infrared absorptive ink composition containing cesium tungsten oxide or lanthanum hexaboride can be exposed to near-infrared laser light to at least absorb near-infrared rays in a predetermined wavelength range. is reduced (reflectance is increased), and characters, images (pictures By applying a near-infrared laser beam so as to draw a pattern (laser marking), the near-infrared absorption characteristics of the drawn part change. Characters, images, etc., which can be recognized by pressing, are formed. The person image 6A is drawn on the printed image 5A by irradiating a near-infrared laser beam so as to draw a person by laser marking. The person identification information 7A is drawn on the printed image 5A by irradiating a near-infrared laser beam so as to write the person's identification information (name, personal identification number, etc.) by laser marking.

As the cesium tungsten oxide-containing ink composition, an ink containing cesium tungsten oxide represented by the chemical formula (general formula) Cs _x W _y O _z (x, y, z are positive real numbers) can be used. . As an example, an ink containing fine particles represented by Cs _0.33 WO ₃ having a hexagonal crystal structure, described in Patent Document 8 (Japanese Patent No. 6160830), can be used. As the lanthanum hexaboride-containing ink composition, an ink containing fine particles represented by the chemical formula LaB ₆ can be used. The near-infrared absorbing ink contains, in addition to cesium tungsten oxide or lanthanum hexaboride, dispersants, monomers, synthetic resins, auxiliaries, and the like. The content of cesium tungsten oxide in the cesium tungsten oxide-containing ink is arbitrary, but in one example, a content of 0.5% by weight (weight percent) to 6% by weight exhibits good characteristics in Examples described later. shown. The content of lanthanum hexaboride in the lanthanum hexaboride-containing ink is also arbitrary, and in one example may be from 0.05 wt% (weight percent) to 6 wt%, but at a content of 0.3 wt% Good properties are shown in the examples below. Even when a near-infrared absorbing ink containing both cesium tungsten oxide and lanthanum hexaboride is used, the content of each of cesium tungsten oxide and lanthanum hexaboride is similarly arbitrary. In any case, the preferred content can be changed depending on the printing density (height). The "content of cesium tungsten oxide (% by weight)" as used herein is the ratio of the weight of cesium tungsten oxide contained in the ink to the total weight of the ink.
Content of cesium tungsten oxide in ink (% by weight) = {(weight of cesium tungsten oxide)/(weight of entire ink)} × 100
is represented by
Similarly, the "lanthanum hexaboride content (% by weight)" is the ratio of the weight of lanthanum hexaboride contained in the ink to the total weight of the ink,
Content of lanthanum hexaboride in ink (% by weight)={(weight of lanthanum hexaboride)/(weight of entire ink)}×100
is represented by

FIG. 42 shows the back surface of the laminate in the first embodiment of mode 2 of the present invention under visible light (the surface visible by rotating the laminate 1A around the AX axis in FIG. 40 and turning it over. FIG. 44 It is a view showing an observation image (visible light image) of the middle, the outermost surface on the side of the oversheet layer 15A. A mark 8A is printed on the back surface of the base material layer 9A using near-infrared transmitting colored ink (visible light absorbing colored ink) (colored ink layer 12A in FIG. 44).

FIG. 43 is a diagram showing an image (near-infrared image) of the back surface of the laminate in the first embodiment of aspect 2 of the present invention, observed by a near-infrared camera (the outline of the laminate is drawn for the purpose of making the figure easier to see). The same applies to other figures.). Since the mark 8A is formed by printing using a near-infrared transparent colored ink, it cannot be recognized (or at least is difficult to recognize) depending on the near-infrared camera.

FIG. 44 shows an example of the layer structure when the laminate shown in FIG. 40 is viewed from the AA' cross section cut along the AA' line in FIG. ) conceptually (each layer is drawn separately to show the layer structure). Incidentally, the colored ink layer 11A (or the fluorescent ink layer, or the hologram layer. Any two or more of these three layers may be combined. The same applies to other examples.), the near-infrared absorbing ink layer 13A, and the openings. The layering order of the region 10AA is arbitrary (see FIGS. 45 to 49), and as shown in FIG. 66 and 68, etc., which will be described later, even if there are a plurality of opening regions and near-infrared absorbing ink layers, the order of lamination of each layer and each opening region is arbitrary.Other embodiments The same is true for ).

The base material layer 9A is made of materials such as PVC (polyvinyl chloride), PET-G (copolyester), PC (polycarbonate), PET (polyethylene terephthalate), PP (polypropylene), and visible light and near-field light. It is formed of a sheet-like base material (white sheet) with low infrared transmittance. When the oversheet layers 14A and 15A are not used, the base material layer 9A may be a paper base material (fine paper, cord paper, etc.) (Even when the oversheet layers 14A and 15A are used, the base material layer It is possible to use the above paper substrate as 9A).

The laser coloring layer 10A is a transparent sheet-like layer (similar to the oversheet layers 14A and 15A, which may be a transparent resin or the like) containing a laser coloring agent, and is fused to the base layer 9A by pressing. be. The laser coloring layer 10A has a property of developing color when exposed to laser light. Since the portion of the laser coloring layer 10A irradiated with the laser beam changes in the absorption of visible light and near-infrared rays (in one example, the visible light absorption and the near-infrared absorption increase, the infrared rays Even when observed with a camera, it looks darker than other parts.), and the part can be recognized visually and by using a near-infrared camera. As the laser coloring agent, as described in Japanese Patent No. 6167803, for example, coloring agents such as dyes and pigments, clays, and the like can be used. Compounds, manganese violet, cobalt violet, metal compounds such as mercury, cobalt, copper, nickel, pearlescent pigments, silicon compounds, micas, kaolins, silica sand, diatomaceous earth, talc, titanium oxide-coated mica, tin dioxide coating One or more of mica, antimony-coated mica, tin+antimony-coated mica, tin+antimony+titanium oxide-coated mica, etc. can be used (Patent No. 6167803, paragraph [0043] ). At least a bismuth-based compound can be used as the color-developing material that develops color with a low-power laser, and the bismuth-based compound is not specifically limited, but examples include bismuth oxide, bismuth nitrate, and bismuth oxynitrate. bismuth nitrate, bismuth halide such as bismuth chloride, bismuth oxychloride, bismuth sulfate, bismuth acetate, bismuth citrate, bismuth hydroxide, and bismuth titanate. From the viewpoint that bismuth nitrate and bismuth hydroxide are preferably used, the bismuth-based compound may include one or more compounds, and includes at least a bismuth-based compound as an example. In addition to the color-developing material, a color-developing material other than the bismuth compound can be used together as long as it is a color-developing material that develops color with laser light (Patent No. 6167803, paragraph [0044]). Further, when using a color-developing material containing at least a bismuth-based compound as an example, a color-developing material that develops color with a laser beam and/or an inorganic compound can be used to increase the color-developing efficiency, and the inorganic compound is a metal oxide, The use of composite oxides or metal salts or compounds of one or more of them allows the inorganic compound to function as a coloring material in some cases even when irradiated with a low-power laser beam, and/or the inorganic compound. It is preferable to add an inorganic compound because it functions to increase the heat generation efficiency to help the color development of the color-developing material, or to increase the whiteness of the white ink containing the color-developing material and the white pigment (Patent No. 6167803 No., paragraph [0045]).

As already described, the laser coloring layer 10A is provided with an opening region 10AA by cutting out a part thereof (FIG. 44). In FIG. 41, the dashed line (the frame of the dashed line is not recognized as a near-infrared image, but is shown to assist in showing the in-plane shape of the opening region 10AA. The same applies to other drawings.) As shown, at least part of the printed image 5A (near-infrared absorbing ink layer 13A) is located in the opening region 10AA (see FIG. 44, etc.), or the opening region 10AA and the printed image 5A and overlap at least partially (FIG. 46, etc.).

An oversheet layer (transparent sheet) 14A having visible light transmittance and near-infrared transmittance is formed on the top layer on the front side of the laminate 1A, and the bottom layer on the back side of the laminate 1A has a visible light transmittance. An oversheet layer (transparent sheet) 15A having transparency and near-infrared transmission is formed. For the oversheet layers 14A and 15A, for example, two sheets of transparent PC (polycarbonate) having a thickness of about 0.05 mm to 0.2 mm are prepared, and the bottom layer of the laminate 1A before forming the oversheet layers 14A and 15A. The laminated body 1A can be formed by laminating each one on the uppermost layer and fusing them by applying heat and pressure. The oversheet layer is made of materials such as PVC (polyvinyl chloride), PET-G (copolyester), PC (polycarbonate), PET (polyethylene terephthalate), and PP (polypropylene), like the base layer. good. When the colored ink layer 11A (or the fluorescent ink layer, the hologram layer, etc.; the same applies to other descriptions) is formed on the oversheet layer 14A, the oversheet layer 14A is formed before the above lamination of the oversheet layer 14A. , the colored ink layer 11A is formed in advance by printing with colored ink. When the colored ink layer 12A is formed on the base material layer 9A, the colored ink layer 12A is formed by printing with colored ink on the base material layer 9A in advance before lamination of the oversheet layer 15A. (When the colored ink layer 12A is formed on the oversheet layer 15A, it is similarly printed before lamination.). When the print layer is formed on the oversheet layer 14A (and the oversheet layer 15A), it is preferable to laminate the print layer so that the print layer is arranged on the base layer 9A side in order to prevent tampering. In addition, when there is an oversheet layer, the printed information is printed inside the laminate, which is more difficult to tamper with. As another example, the laminate 1A before forming the oversheet layers 14A and 15A is laminated from above and below with any two transparent films (if necessary, each film, base layer 9A, laser coloring Any of the layers 10A may be previously printed with colored ink, etc.), and the laminate 1A may be formed by bonding the layers with an adhesive. The same applies to the fusion bonding of the laser coloring layer 10A to the base material layer 9A. When the laser coloring layer 16A is provided as shown in FIG. 50, it may be formed in the same manner as the laser coloring layer 10A, including fusion bonding, and may be printed. As already mentioned, it is not essential to form the oversheet layers 14A and 15A, and either one of the oversheet layers 14A and 15A may be formed, or the laminate may be formed without forming either oversheet layer. 1A may be made. Laser marking on the laser coloring layer 10A is performed from the uppermost layer side (the oversheet layer 14A side) of the laminate 1A. When the laser coloring layer 16A is provided as shown in FIG. 50 and laser marking is performed on the laser coloring layer 16A, such laser marking is performed from the bottom layer side (oversheet layer 15A side) of the laminate 1A. .

On the oversheet layer 14A (It may be on the laser coloring layer 10A, or on the substrate layer 9A, or on the near-infrared absorbing ink layer 13A. The same applies to the fluorescent ink layer 11A and the hologram layer 11A.) A colored ink layer 11A is formed on the . As already described, the colored ink layer 11A is formed by printing marks 4A on the oversheet layer 14A (or on the laser coloring layer 10A or the like) using a near-infrared transparent colored ink. Any method can be used to form the colored ink layer 11A. For example, printing methods such as letterpress printing, offset printing, silk screen printing, gravure printing, flexographic printing, and inkjet printing, or other arbitrary forming methods can be used. In place of the colored ink layer 11A or in addition to the colored ink layer 11A, UV fluorescent medium B (manufactured by T&K TOKA), UV fluorescent medium Y (manufactured by T&K TOKA), UV fluorescent medium R (manufactured by T&K TOKA), etc. The fluorescent ink layer 11A may be formed using near-infrared transparent fluorescent ink. The fluorescent ink layer 11A can be formed by printing on the oversheet layer 14A or the like in the same manner as the colored ink layer 11A using a fluorescent ink composition. can be printed. Alternatively, instead of the colored ink layer 11A and the fluorescent ink layer 11A, or in addition to at least one of these layers, a near-infrared transmissive hologram layer 11A such as a transparent hologram may be formed. Even if the colored ink layer 11A, the fluorescent ink layer 11A, and the hologram layer 11A are formed on the front surface (the surface opposite to the substrate layer 9A) of the oversheet layer 14A, they may be formed on the back surface (the substrate) of the oversheet layer 14A. The surface on the side of the material layer 9A), the front surface of the laser coloring layer 10A (the surface opposite to the base layer 9A), the back surface of the laser coloring layer 10A (the base layer 9A side surface) or formed on the front surface of the base material layer 9A (laser coloring layer 10A side surface), the near-infrared absorbing ink layer formed on the base material layer 9A 13A, or may be formed on two or more of these surfaces (illustration is omitted as appropriate. The same applies to the colored ink layer 12A, the fluorescent ink layer 12A, and the hologram layer 12A.). Note that the colored ink layer 11A, the fluorescent ink layer 11A, and the hologram layer 11A do not need to have near-infrared transmittance. In the examples here, in order to simplify the diagram showing the observed image, the layers having near-infrared transmittance are standardized.

Further, on the substrate layer 9A (or on the oversheet layer 15A; the same applies to the fluorescent ink layer 12A and the hologram layer 12A), the colored ink layer 12A (or fluorescent ink layer, hologram layer, etc., materials and formation) is provided. The method may be the same as that for the colored ink layer 11A, fluorescent ink layer 11A, or hologram layer 11A.Two or more of these layers may be formed.The same applies to other descriptions.). Even if each of the colored ink layer 12A, the fluorescent ink layer 12A, and the hologram layer 12A is formed on the front surface of the oversheet layer 15A (the surface opposite to the base material layer 9A), the back surface of the oversheet layer 15A ( It may be formed on the surface facing the base material layer 9A), or may be formed on two or more of these surfaces (illustration is omitted as appropriate).

FIGS. 45 to 49 show, as modifications of the layer structure of FIG. 44, the layer structure of the laminate shown in FIG. 40 taken along line AA' in FIG. FIG. 40 is a diagram conceptually showing an example (viewed from below in the paper surface of FIG. 40) (each layer is drawn separately to show the layer structure) (variation examples 1 to 5 of the stacking order), FIG. 50 shows, as a modification of the layer structure of FIG. 44, an example of the layer structure of the laminate shown in FIG. 40, viewed from below) (each layer is drawn separately to show the layer structure) (a laser coloring layer is added to the back side). As already mentioned, the layers and elements can be stacked in any order, and other layers and elements such as the laser coloring layer 16A may be further provided in the layer structure of FIG. It is not essential to have all the layers and elements shown).

As an example of a method for manufacturing the laminate 1 shown in FIGS. 40 to 44,
(1) forming a near-infrared absorbing ink layer 13A (printed image 5A) by printing with a colored ink layer 11A (mark 4A) and a near-infrared absorbing ink on the oversheet layer 14A; A colored ink layer 12A (marks 8A) is formed on the substrate layer 9A by printing using colored ink.
(2) An opening region 10AA is formed by cutting out the laser coloring layer 10A.
(3) In addition to the layers described above, an oversheet layer 15A is also prepared, and the layers are laminated in the order shown in FIG. (in this case, at least a portion of the near-infrared absorbing ink layer 13A enters the opening region 10AA), and is fused by press processing.
(4) Laser marking is performed on the laser coloring layer 10A from the surface of the obtained laminate on the oversheet layer 14A side to draw a person image 2A and person identification information 3A.
(5) Laser marking is performed on the printed image 5A (near-infrared absorbing ink layer 13A) from the surface of the laminate on the oversheet layer 14A side to draw a person image 6A and person identification information 7A.
1 A of laminated bodies can be produced by the method called this. 45 to 50, the procedure is basically the same except for changing the order of lamination and laminating an additional laser coloring layer 16A. can be made.

(Authentication method)
By comparing the visible light image and the near-infrared image of the laminate 1A, the authenticity of the laminate 1A can be determined. Specifically, a person image 2A that can be recognized as a visible light image (including an image obtained by viewing with the naked eye; the same applies to other embodiments), and person identification information 3A (these can also be recognized as a near-infrared image). ) matches the person specified by the person image 6A that can be recognized as a near-infrared image and the person specified by the person identification information 7A, the laminate 1A is not genuine as an identification card or the like. The person specified by the person image 2A and person identification information 3A that can be determined as a visible light image and the person specified by the person image 6A and person identification information 7A that can be recognized as a near-infrared image do not match. Therefore, it can be determined that the laminate 1A is not genuine as an identification card or the like (it is a counterfeit). Judgment may be performed by a person using a (near) infrared camera or the like, or a visible light image and a near infrared image are acquired by an arbitrary optical analysis device, and both images are transferred to a computer using an arbitrary data transfer device. may be read in and a computer processor may execute an image recognition/comparison program or the like to compare and judge both images (the same applies to other embodiments).

FIG. 51 is a diagram showing microcharacters that can be seen when part of the micro-display printed (offset printing, etc.) image with near-infrared absorbing ink shown in FIG. 41 is enlarged (near-infrared image). As can be seen from the enlarged display of a portion 17A of the printed image 5A shown in FIG. 51, the printed image 5A includes microcharacters 18A (the microcharacters 18A are omitted in FIG. etc. are omitted). Instead of microcharacters, the print image 5 may include security designs such as colorful patterns, micro symbols, relief patterns, etc., or may be printed by combining these. A minute display such as micro-characters that is difficult to reproduce on a copying machine (a display of a size that cannot be seen with the naked eye. In addition to micro-characters, for example, minute characters, symbols, and figures may be used. Note that here, The "micro character" is not limited to characters in μm units (characters with a diameter, width, or height of less than 1 mm), but characters with a diameter, width, or height of 1 mm or more are "micro characters". The same applies to the sizes of other microdisplays). In particular, if a micro-character having a line width or a character size that is difficult to reproduce by laser marking (laser printing) described later is included, the anti-counterfeiting effect of the laminate 1A will be extremely high.

FIG. 52 is a diagram showing micro-characters visible when part of the printed image with near-infrared absorbing ink and part of the human image generated by laser marking (laser drawing) shown in FIG. 41 are enlarged. (near-infrared image). The microcharacters 19A are microcharacters formed when the printed image 5A is printed using near-infrared absorbing ink (micro-display printing), and some of them remain even after the person image 6A is laser-marked. The microcharacters 20A are microcharacters formed when the printed image 5A is printed using the near-infrared absorbing ink. In one example, the printed image 5A includes at least one of microcharacters, colorful patterns, fine symbols, relief patterns, etc. (security design. The size of individual characters such as microcharacters, fine symbols, etc. is arbitrary, In one example, the maximum diameter, maximum width, or maximum height can be set to 1000 μm (micrometers).) Therefore, the person image 6A, person identification information 7A, etc. drawn by laser marking are formed. The pattern of , can also be seen as a security design when magnified with a near-infrared camera or the like. By adopting such a configuration, it is possible to further improve the tampering and counterfeiting prevention effect of the laminate 1A.

(Second embodiment)
FIG. 53 is a diagram (near-infrared image) showing micro characters generated by laser marking (laser printing) on the front surface of the laminate in the second embodiment of aspect 2 of the present invention. The layer structure of the laminate 1A of FIG. 53 may be the same as that of the first embodiment (see FIGS. 44 to 50), and microcharacters 21A are written on the near-infrared absorbing ink layer 13A by laser marking. 41, the personal identification information 7A is not laser-marked (however, the content indicated by the microcharacters 21A may be the same as the content indicated by the personal identification information 7A in FIG. 41). is different from the first embodiment.

(Third embodiment)
54 is a diagram showing a near-infrared image of the front surface of the laminate in the third embodiment of mode 2 of the present invention. FIG. Unlike the laminate 1A of the first embodiment, the mark 22A is printed on the substrate layer 9A using near-infrared absorbing ink so as to overlap the mark 4A (see FIG. 40) printed with colored ink. (Near-infrared absorbing ink layer 13A. However, the mark 22A may be formed using near-infrared absorbing ink mixed with colored ink. In such a case, the near-infrared absorbing ink may be mixed with other components such as colored ink. A layer formed using ink to which is added is also referred to herein as a "near-infrared absorbing ink layer" (the same applies to other embodiments). A person image 23A is drawn by laser marking on the mark 22A. Except for these points, the laminate in the third embodiment is the same as the laminate in the first embodiment, and the layer structure may also be the same in both embodiments.

(Fourth embodiment)
FIG. 55 is a diagram showing an observation image (visible light image) of the front surface of the laminate in the fourth embodiment of aspect 2 of the present invention using visible light, and FIG. A diagram showing an observation image (near-infrared image) of the front surface of the laminate in the fourth embodiment by a near-infrared camera (the outline of the laminate is drawn for the purpose of making the figure easier to see. The frame (dashed line) of the area does not appear as a near-infrared image, but is shown for convenience.The same applies to other figures.), and FIG. , and a view showing an observation image (visible light image) of the back surface under visible light (the surface visible by turning over the laminate by rotating the laminate around the AX axis in FIG. 55; the same applies to other embodiments.) FIG. 58 is a diagram showing an observation image (near-infrared image) of the back surface of the laminate in the fourth embodiment of aspect 2 of the present invention with a near-infrared camera. is drawn in. The same applies to other figures.). FIG. 59 is an example of the layer structure of the laminate shown in FIG. 55 when viewed from the BB' cross section cut along the BB' line in FIG. ) conceptually (each layer is drawn separately to show the layer structure. In addition, the colored ink layer (or fluorescent ink layer, hologram layer) 12A on the back side is precisely BB ' is not cut by the line, but is drawn for the purpose of making the layer structure easier to understand. The same applies to other drawings showing the layer structure.), and FIG. A diagram conceptually showing another example of the layer structure when looking at the BB' cross section cut along the BB' line (inside the paper surface of FIG. 55, viewed from the right) (to show the layer structure In addition, the colored ink layer (or fluorescent ink layer, hologram layer) 12A on the back side is not precisely cut by the BB' line, but is intended to make the layer structure easier to understand. (The same applies to other drawings showing the layer structure.).

As shown in FIGS. 59 and 60, the laminate 1A of the fourth embodiment is different from the first embodiment described with reference to FIGS. 2 base layer 27A (the material and the like may be the same as those of the base layer 9A. The base layer 9A shown in FIG. 44 and the like may also be composed of a plurality of sheets. ), and a substrate intermediate layer is provided as a layer sandwiched (at least partially) between the first substrate layer 26A and the second substrate layer 27A. The substrate intermediate layer first portion 25A is located between the first substrate layer 26A and the second substrate layer 27A, and the substrate intermediate layer second portion 24A is located between the first substrate layer 26A. and the second base material layer 27A. The second portion 24A of the base material intermediate layer is positioned at the end of the laminate 1A, and can be used as a binding margin to produce a booklet by machine binding.

Such a base material intermediate layer is formed by sandwiching (at least part of) the base material intermediate layer between the first base material layer 26A and the second base material layer 27A and performing a heat press treatment to form the first base material layer. It can be provided by fusing 26A and the second base layer 27A. It may be provided by sticking to the first base material layer 26A and the second base material layer 27A using an adhesive. As the base material intermediate layer, a sheet made of any material such as paper, resin, cloth, non-woven fabric, etc. can be used. textiles.

As an example of the method for manufacturing the laminate 1 shown in FIGS. 55 to 59,
(1) forming a near-infrared absorbing ink layer 13A (printed image 5A) by printing with a colored ink layer 11A (mark 4A) and a near-infrared absorbing ink on the oversheet layer 14A; A colored ink layer 12A (marks 8A) is formed on the first base material layer 26A by printing using colored ink.
(2) An opening region 10AA is formed by cutting out the laser coloring layer 10A.
(3) In addition to the above layers, the second base material layer 27A, the base material intermediate layers (24A, 25A), and the oversheet layer 15A are also prepared, and the layers are laminated in the order shown in FIG. 59 and printed. The image 5A is arranged so that at least a portion of the opening region 10AA of the laser coloring layer 10A overlaps (in this case, at least a portion of the near-infrared absorbing ink layer 13A enters the opening region 10AA), and is melted by press processing. to wear
(4) Laser marking is performed on the laser coloring layer 10A from the surface of the obtained laminate on the oversheet layer 14A side to draw a person image 2A and person identification information 3A.
(5) Laser marking is performed on the printed image 5A (near-infrared absorbing ink layer 13A) from the surface of the laminate on the oversheet layer 14A side to draw a person image 6A and person identification information 7A.
1 A of laminated bodies can be produced by the method called this. 60, or in the case of producing the laminate 1A with a layer structure as a modified example in which the laser coloring layer 16A is provided in the same manner as in FIG. It can be produced basically in the same procedure except for lamination.

FIG. 61 is a diagram (visible light image) showing a booklet produced using the laminate in the fourth embodiment of aspect 2 of the present invention, and FIG. 62 is a fourth embodiment of aspect 2 of the present invention. 2 is a diagram (near-infrared image) showing a booklet produced using the laminate in . A booklet 100A can be produced by using the laminate 1A as a sheet and binding it with the other sheets 28A, 29A, 30A, etc. by machine stitching or the like using the second portion 24A of the substrate intermediate layer as a binding margin.

(Authentication method)
By comparing the visible light image and the near-infrared image of the laminate 1A, it is possible to determine the authenticity of the laminate 1A (authenticity of the booklet 100A). Specifically, a person image 2A that can be recognized as a visible light image (including an image obtained by viewing with the naked eye. The same applies to other embodiments.), and person identification information 3A (these can also be recognized as a near-infrared image). ) matches the person specified by the person image 6A that can be recognized as a near-infrared image and the person specified by the person identification information 7A, the laminate 1A (or the booklet 100A) is an identification card. etc. (a passport is an example of the booklet 100A). If the person specified by the person image 6A and the person identification information 7A do not match, the laminate 1A (or the booklet 100A) is not authentic as an identification card or the like (as a booklet, a passport or the like). (it is a fake).

(Fifth embodiment)
FIG. 63 is a diagram showing an observation image (near-infrared image) of the front surface of the laminate in the fifth embodiment of aspect 2 of the present invention by a near-infrared camera (for the purpose of making the diagram easier to see, the laminate The frame (broken line) of the opening area does not appear in the near-infrared image, but is shown for convenience.The same applies to other figures.). Unlike the first embodiment, the dashed line indicating the opening area 10AA completely covers the printed image 5A, and the opening area 10AA is larger than the printed image 5A in the plane of FIG. Other configurations of the laminate 1A of the fifth embodiment may be the same as those of the laminate 1A of the first embodiment.

(Sixth embodiment)
FIG. 64 is a diagram showing an observation image (near-infrared image) of the front surface of the laminate in the sixth embodiment of aspect 2 of the present invention by a near-infrared camera. The frame (broken line) of the opening area does not appear in the near-infrared image, but is shown for convenience.The same applies to other figures.). Unlike the first embodiment, the dashed line indicating the opening area 10AA is completely covered with the printed image 5A, and the opening area 10AA is smaller than the printed image 5A in the plane of FIG. Other configurations of the laminate 1A of the sixth embodiment may be the same as those of the laminate 1A of the first embodiment.

(Seventh embodiment)
FIG. 65 is a diagram showing an observation image (near-infrared image) of the front surface of the laminate according to the seventh embodiment of aspect 2 of the present invention, taken with a near-infrared camera (for the purpose of making the diagram easier to see, the laminate The frame (dashed line) of the opening area does not appear in the near-infrared image, but is shown for convenience. A diagram conceptually showing an example of the layer structure when viewing the BB' section of the laminate cut along the BB' line in FIG. (Each layer is drawn separately to show the layer structure. In addition, the colored ink layer (or fluorescent ink layer, hologram layer) 12A on the back side is not exactly cut by the BB' line, but the layer It is drawn for the purpose of making the structure easier to understand, and the same applies to other drawings showing the layer structure.). As shown in FIGS. 65 and 66, in the laminate 1A of the seventh embodiment, two opening regions (opening regions 10AA and 10BA) are provided in the laser coloring layer 10A. The number of opening regions provided by cutting out a part of the laser coloring layer 10A or the like is arbitrary, and two or more opening regions may be provided. Other configurations of the laminate 1A of the seventh embodiment may be the same as those of the laminate 1A of the first embodiment.

(Eighth embodiment)
FIG. 67 is a diagram showing an observation image (near-infrared image) of the front surface of the laminate according to the eighth embodiment of aspect 2 of the present invention, taken with a near-infrared camera (for the purpose of making the diagram easier to see, the laminate 68 is shown in FIG. A diagram conceptually showing an example of the layer structure when viewing the BB' section of the laminate cut along the BB' line in FIG. (Each layer is drawn separately to show the layer structure. In addition, the colored ink layer (or fluorescent ink layer, hologram layer) 12A on the back side is not exactly cut by the BB' line, but the layer It is drawn for the purpose of making the structure easier to understand, and the same applies to other drawings showing the layer structure.). As shown in FIGS. 67 and 68, in the laminate 1A of the eighth embodiment, two printed images (printed images 5AA and 5BA) are provided as printed images with near-infrared absorbing ink (near-infrared absorbing ink). Ink layers 13AA and 13BA.The components of the near-infrared absorbing ink layers 13AA and 13BA may be the same as those of the near-infrared absorbing ink layer 13A.). The number of printed images using the near-infrared absorbing ink is arbitrary, and two or more printed images may be provided. With respect to other configurations, the laminate 1A of the eighth embodiment may be the same as the laminate 1A of the first embodiment (two or more opening regions are provided, and a printed image is printed with near-infrared absorbing ink. 2 or more may be provided).

(Ninth embodiment)
FIG. 69 is a diagram showing an observation image (visible light image) of the front surface of the laminate in the ninth embodiment of aspect 2 of the present invention (the lenticular lens is transparent, but is drawn for the purpose of making the diagram easier to see). ). 70 is a diagram showing a near-infrared image of the front surface of the laminate shown in FIG. 69 when viewed in the direction of arrow C in FIG. 73 described later, and FIG. FIG. 74 is a diagram showing a near-infrared image of the front surface when the body is viewed in the direction of arrow D in FIG. 73 described below. FIG. 72 shows an example of the layer structure of the laminate shown in FIG. 69 when looking at the AA' cross section cut along the AA' line in FIG. ) conceptually (each layer is drawn separately to show the layer structure. In addition, a colored ink layer (or fluorescent ink layer, hologram layer) 11A on the front side and a colored layer on the back side Strictly speaking, the ink layer (or fluorescent ink layer, hologram layer) 12A is not cut along the line AA', but is drawn for the purpose of making the layer structure easier to understand.The same applies to other drawings showing the layer structure. ). Unlike the first embodiment shown in FIG. 40 and the like, an area that at least partially overlaps the near-infrared absorbing ink layer 13A on the opposite side of the oversheet layer 14A from the near-infrared absorbing ink layer 13A (in FIG. 72 Although they overlap completely, they may overlap only partially.) is formed with a lenticular lens 31A. The layered structure of FIG. 72 may be the same as the layered structure of FIG. 44 and the like, except that the lenticular lens 31A is formed.

FIG. 73 is an example of the layer structure of the laminate shown in FIG. 69 when viewed from the BB' cross section cut along the BB' line in FIG. ) conceptually (each layer is drawn separately to show the layer structure. In addition, the colored ink layer (or fluorescent ink layer, hologram layer) 12A on the back side is precisely BB 'Although it is not cut by the line, it is drawn for the purpose of making the layer structure easy to understand.The same applies to other drawings showing the layer structure.). When the lenticular lens 31A as an example of the plurality of convex optical element portions is viewed from the direction as shown in FIG. along) has a shape that appears to be lined up. In FIG. 73, 7 convex lens portions are drawn side by side, but this is a display for convenience to simplify and explain the structure of the lenticular lens. The lenticular lens 31A can be formed to include a convex lens portion of about 10 mm. Alternatively, a smaller number of convex lens portions may be used, and in general, lenticular lens 31A may be formed to include any plurality of convex lens portions. As a method of forming the lenticular lens 31A on the oversheet layer 14A, an already manufactured lenticular lens may be adhered onto the oversheet layer 14A with an adhesive or the like, or the lenticular lens 31A may function as the lenticular lens 31A. The oversheet layer 14A may be formed by heat and pressure so as to have a shape that fits, or a lenticular lens substrate may be formed on the oversheet layer 14A by a printing method and fixed by a method such as UV curing. .

When images, letters, etc. drawn by laser marking on the near-infrared absorbing ink layer 13A are viewed using a near-infrared camera or the like, different displays (near-infrared images) are viewed depending on the direction from which they are viewed. be able to. When viewed in the direction of arrow C in FIG. 73, the near-infrared image shown in FIG. 70 can be seen, and when viewed in the direction of arrow D in FIG. 73, the near-infrared image shown in FIG. 71 can be seen. In the example of FIG. 73, a printed image 5A is printed using near-infrared absorbing ink on the substrate layer 9A so as to overlap with the lenticular lens 31A (near-infrared absorbing ink layer 13A). A person image 6A shown in FIG. 70 is drawn on the near-infrared absorbing ink layer 13A by laser marking that irradiates near-infrared laser light in the direction (angle) of arrow C, and the direction (angle) of arrow D in FIG. ), personal identification information 7A shown in FIG. By viewing the layer 13A with a near-infrared camera or the like, the person image 6A can be recognized. The person identification information 7A can be recognized by looking at it. That is, by changing the observation angle, the latent pattern can be visually recognized, and near-infrared absorption MLI (Multiple Laser Image) is realized.

FIG. 74 is a diagram conceptually explaining the lenticular principle (it does not have to match the specific configuration described using FIGS. 69 to 73). When the near-infrared absorbing ink layer 13A is viewed from the first position P1 through the lenticular lens 31A with an infrared camera or the like, the patterns and the like drawn on the plurality of printing portions IM1 are combined to form a person image 6A. The first display (picture) can be recognized. When the near-infrared absorbing ink layer 13A is viewed from the second position P2 through the lenticular lens 31A using an infrared camera or the like, the patterns and the like drawn on the plurality of printing portions IM2 are combined to form personal identification information 7A. A second representation (character) can be recognized.

As an example of the method for manufacturing the laminate 1 shown in FIGS. 69 to 73,
(1) forming a near-infrared absorbing ink layer 13A (printed image 5A) by printing with a colored ink layer 11A (mark 4A) and a near-infrared absorbing ink on the oversheet layer 14A; A colored ink layer 12A (marks 8A) is formed on the substrate layer 9A by printing using colored ink.
(2) An opening region 10AA is formed by cutting out the laser coloring layer 10A.
(3) In addition to the layers described above, an oversheet layer 15A is also prepared, and the layers are laminated in the order shown in FIGS. overlap (in this case, at least part of the near-infrared absorbing ink layer 13A enters the opening region 10AA), and is fused by heat press treatment using a press plate with unevenness capable of forming a lenticular lens. , fused by pressing while forming the lenticular lens 31A.
(4) From the surface of the obtained laminate on the side of the oversheet layer 14A, the person image 6A is made near-infrared absorptive by laser marking by irradiating near-infrared laser light in the direction (angle) of arrow C in FIG. Personal identification information 7A is drawn on the near-infrared absorbing ink layer 13A by laser marking that draws on the ink layer 13A and irradiates near-infrared laser light in the direction (angle) of arrow D in FIG.
1 A of laminated bodies can be produced by the method called this. 45 to 50, the layered structure 1A is basically the same except that the order of layering is changed and an additional laser coloring layer 16A is also layered. It can be made by procedure.

(Authentication method)
By comparing the visible light image and the near-infrared image of the laminate 1A, the authenticity of the laminate 1A can be determined. Specifically, a person image 2A that can be recognized as a visible light image (including an image obtained by viewing with the naked eye. The same applies to other embodiments.), and person identification information 3A (these can also be recognized as a near-infrared image). ) matches the person specified by the person image 6A that can be recognized as a near-infrared image and the person specified by the person identification information 7A, the laminate 1A is an authentic identification card or the like. The person specified by the person image 2A and person identification information 3A that can be determined as a visible light image and the person specified by the person image 6A and person identification information 7A that can be recognized as a near-infrared image do not match. Therefore, it can be determined that the laminate 1A is not genuine as an identification card or the like (it is a counterfeit).

FIG. 75 is a diagram schematically showing the configuration of a laser marker device for performing laser marking (drawing, printing, etc.) described so far. The laser marker device 32A includes a control section 33A, a storage section 34A, a driving (scanning) section 35A, a laser beam irradiation section 36A, and the like. While driving the head of the laser light irradiation unit 36A by the drive unit 35A, the near-infrared absorption layer (near-infrared The above laser marking is performed on the absorbent ink layers 13A, 13AA, 13BA) or on the laser coloring layer 10A (or the laser coloring layer 16A). In the operation of the laser marker device 32A, a control unit 33A (a separate computer external to the laser marker device 32A is used as the control unit 33A) includes various control circuits such as a CPU or a built-in control circuit. can also function.), the driving unit 35A, which is a driving device equipped with a motor or the like, is directed toward the near-infrared absorbing ink layers 13A, 13AA, 13BA or the laser coloring layers 10A, 16A as already described. While driving the head of the laser light irradiation unit 36A (moving (scanning) the head), the laser light irradiation unit 36A (in one example, a Nd:YAG laser that is a device for generating a laser beam with a laser wavelength of 1064 nm A laser light irradiation device equipped with various devices for irradiating a target with laser light, such as a head, etc.) emits near-infrared laser light (near-infrared laser beam ) is irradiated. The storage unit 34A, which includes a storage device such as a semiconductor memory and a magnetic disk, contains characters, images, etc. to be drawn by laser marking, which are read by the control unit 33A and used to control the operation of the laser marker device 32A. Various data are stored, and the laser marker device 32A draws characters, images, etc. stored in the storage section 34A on the near-infrared absorbing layer or the laser coloring layer. Since there are many known laser marking devices, they will not be described in further detail here.

(Example of near-infrared absorbing ink)
Hereinafter, experimental results of various laminates (offset printed matter) produced using cesium tungsten oxide-containing ink and lanthanum hexaboride-containing ink as near-infrared absorbing inks that can be used in aspect 2 of the present invention are compared. As an example, the results will be described in comparison with experimental results of offset printed matter produced using ink containing ytterbium oxide.

(Comparative example 1)
Ytterbium (III) oxide, 3N5 powder and an ink medium containing monomers, synthetic resins, and other non-infrared absorbing materials are mixed so that the weight ratio of ytterbium oxide to ink medium is 25:75, and oxidation is performed. An ink was prepared with a ytterbium content of 25% by weight. Using the ytterbium oxide-containing ink prepared in this manner, printing was performed on a partial area of the woodfree paper that was the substrate with an offset printing machine (offset printability tester IGT C1 (manufactured by IGT Testing Systems)). rice field. The resulting printed matter was used as the laminate of Comparative Example 1, and photographed with an infrared visualization device VSC8000 (manufactured by Foster and Freeman) with a filter that cuts off light with a wavelength of 925 nm or less attached to the camera lens of the device. .

(Example 1)
A dispersion containing cesium tungsten oxide Cs _0.33 WO ₃ and the same ink medium as in Comparative Example 1 containing monomers, synthetic resins, and other non-infrared absorbing materials were added to the weight of cesium tungsten oxide and all other components. An ink with a cesium tungsten oxide content of 2% by weight was prepared by mixing in a ratio of 2:98. Using the cesium tungsten oxide-containing ink prepared in this way, printing was performed on a partial area of the woodfree paper that was the substrate with an offset printing machine (offset printability tester IGT C1 (manufactured by IGT Testing Systems)). went. The resulting printed matter was used as the laminate of Example 1, and photographed with an infrared visualization device VSC8000 (manufactured by Foster and Freeman) with a filter that cuts off light with a wavelength of 925 nm or less attached to the camera lens of the device. .

Infrared photographs of the ytterbium oxide-containing ink and the cesium tungsten oxide-containing ink prepared in Comparative Example 1 and Example 1 were taken with the above-mentioned infrared camera, and the printed matter was offset-printed as described above using each ink. FIG. 33 shows an infrared photograph taken by the infrared camera. From the photographs of the inks, it can be understood that both the ytterbium oxide-containing ink and the cesium tungsten oxide-containing ink exhibit near-infrared absorptivity. I couldn't. On the other hand, in printed matters obtained by offset printing with ink containing cesium tungsten oxide, which has a low content, a difference in brightness between the unprinted area and the printed area can be visually recognized. was found to have

The above experimental results are summarized in the following table.

In the above table, "film thickness" is the film thickness of the ytterbium oxide-containing ink layer or the cesium tungsten oxide-containing ink layer formed by offset printing. It is a reference value assuming a typical film thickness to be formed. The film thickness formed by offset printing in each example described later is also estimated to be about 1 μm to about 3 μm. In addition, experiments were conducted under the same conditions such as print density for all the examples of mode 2 in this specification, and theoretically, the film thicknesses are considered to be the same. In addition, the "infrared absorption rate" in Example 1 means the reflectance measured using a JASCO V-670 UV-visible near-infrared spectrophotometer (manufactured by JASCO Corporation) (the irradiated light is reflected on the surface of the printed matter. It is the ratio of the intensity of the reflected light from the surface of the target printed matter to the intensity of the reflected light from the reference base material surface (reference portion). (Absorptance (%)=100-Reflectance (%)).

Next, offset printing was performed on various substrate sheets using a near-infrared absorbing ink with a cesium tungsten oxide (Cs _0.33 WO ₃ ) content (content rate) of 2% by weight. Then, laser marking was performed using a laser marker device, and the reflectance of electromagnetic waves in the visible to near-infrared wavelength range was measured for the marked and non-marked portions. As in Example 1, the “reflectance” in the following examples is the ratio of the intensity of the reflected light when the irradiated light is reflected on the surface of the printed matter, and is the reference substrate surface ( It is the ratio of the intensity of the reflected light from the surface of the target printed matter to the intensity of the reflected light from the reference part) (obtained by measurement using a JASCO V-670 UV-visible near-infrared spectrophotometer (manufactured by JASCO Corporation) value.).
The “reflectance” in Example 1 above and Examples 2-11 below can be generally defined by the following equation.
Reflectance (%) of target portion (target surface)={(intensity of reflected light from target portion (target surface))/(intensity of reflected light from reference portion (reference surface))}×100

を用い、波長１０６４ｎｍのＮｄ：ＹＡＧレーザーによるレーザー光によって上記印刷面にレーザー印字を行った。 レーザー印字された部分の、波長４００ｎｍ～２０００ｎｍにおける可視光～近赤外線の反射率を、ＪＡＳＣＯ Ｖ－６７０ 紫外可視近赤外分光光度計（日本分光株式会社製）を用いて測定した。 (Example 2)
By mixing a dispersion containing cesium tungsten oxide Cs _0.33 WO ₃ with monomers, synthetic resins, auxiliaries, etc. so that the weight ratio of cesium tungsten oxide to all other components is 2:98. , an ink containing 2% by weight of cesium tungsten oxide was prepared. Using the cesium tungsten oxide-containing ink thus produced, printing was performed on a PC (polycarbonate) sheet as a base material by an offset printing machine (offset printability tester IGT C1 (manufactured by IGT Testing Systems)). . The resulting printed matter was used as the laminate of Example 2, and the reflectance of visible light to near infrared light at a wavelength of 400 nm to 2000 nm on the printed surface before laser printing was measured with a JASCO V-670 ultraviolet visible near infrared spectrophotometer (Japan Spectroscopy Co., Ltd.). Furthermore, as a laser marker device,

was used to perform laser printing on the printed surface with laser light from an Nd:YAG laser with a wavelength of 1064 nm. Visible to near-infrared reflectance at wavelengths of 400 nm to 2000 nm of the laser-printed portion was measured using a JASCO V-670 ultraviolet-visible-near-infrared spectrophotometer (manufactured by JASCO Corporation).

を用い、波長１０６４ｎｍのＮｄ：ＹＡＧレーザーによるレーザー光によって上記印刷面にレーザー印字を行った。 レーザー印字された部分の、波長４００ｎｍ～２０００ｎｍにおける可視光～近赤外線の反射率を、ＪＡＳＣＯ Ｖ－６７０ 紫外可視近赤外分光光度計（日本分光株式会社製）を用いて測定した。 (Example 3)
By mixing a dispersion containing cesium tungsten oxide Cs _0.33 WO ₃ with monomers, synthetic resins, auxiliaries, etc. so that the weight ratio of cesium tungsten oxide to all other components is 2:98. , an ink containing 2% by weight of cesium tungsten oxide was prepared. Using the cesium tungsten oxide-containing ink prepared in this way, printing is performed on a PET-G (copolyester) sheet as a substrate by an offset printing machine (offset printability tester IGT C1 (manufactured by IGT Testing Systems)). did The resulting printed matter was used as the laminate of Example 3, and the reflectance of visible light to near infrared rays at a wavelength of 400 nm to 2000 nm on the printed surface before laser printing was measured with a JASCO V-670 ultraviolet visible near infrared spectrophotometer (Japan Spectroscopy Co., Ltd.). Furthermore, as a laser marker device,

was used to perform laser printing on the printed surface with laser light from an Nd:YAG laser with a wavelength of 1064 nm. Visible to near-infrared reflectance at wavelengths of 400 nm to 2000 nm of the laser-printed portion was measured using a JASCO V-670 ultraviolet-visible-near-infrared spectrophotometer (manufactured by JASCO Corporation).

を用い、波長１０６４ｎｍのＮｄ：ＹＡＧレーザーによるレーザー光によって上記印刷面にレーザー印字を行った。 レーザー印字された部分の、波長４００ｎｍ～２０００ｎｍにおける可視光～近赤外線の反射率を、ＪＡＳＣＯ Ｖ－６７０ 紫外可視近赤外分光光度計（日本分光株式会社製）を用いて測定した。 (Example 4)
By mixing a dispersion containing cesium tungsten oxide Cs _0.33 WO ₃ with monomers, synthetic resins, auxiliaries, etc. so that the weight ratio of cesium tungsten oxide to all other components is 2:98. , an ink containing 2% by weight of cesium tungsten oxide was prepared. Using the cesium tungsten oxide-containing ink prepared in this way, printing is performed on a PVC (polyvinyl chloride) sheet as a substrate by an offset printing machine (offset printability tester IGT C1 (manufactured by IGT Testing Systems)). went. The obtained printed matter was used as the laminate of Example 4, and the reflectance of visible light to near infrared light at a wavelength of 400 nm to 2000 nm on the printed surface before laser printing was measured with a JASCO V-670 ultraviolet visible near infrared spectrophotometer (Japan Spectroscopy Co., Ltd.). Furthermore, as a laser marker device,

was used to perform laser printing on the printed surface with laser light from an Nd:YAG laser with a wavelength of 1064 nm. Visible to near-infrared reflectance at wavelengths of 400 nm to 2000 nm of the laser-printed portion was measured using a JASCO V-670 ultraviolet-visible-near-infrared spectrophotometer (manufactured by JASCO Corporation).

FIG. 34 shows the results of reflectance measurements performed in Examples 2 to 4 above. 35 shows the reflectance measurement results of Example 2, FIG. 36 shows the reflectance measurement results of Example 3, and the reflectance measurement results of Example 4 are shown in FIG. 37 are extracted from the graph of FIG. 34 and shown in FIG. In the graphs of FIGS. 34 to 37, the value on the horizontal axis is the wavelength (nm) of the electromagnetic wave, and the value on the vertical axis is the reflectance of the electromagnetic wave of the wavelength indicated by the value on the horizontal axis on the printed surface or laser-printed portion. (%).

As is clear from the graphs of FIGS. 34 to 37, laser printing increases the reflectance (decreases the absorptivity) in the near-infrared region, regardless of which base material is used. The width of the increase varies depending on the wavelength on the horizontal axis, but in the near infrared region of 780 nm to 2000 nm, the reflectance is increased by at least 5% or more, generally 10% to 15%, or more due to laser printing. Readable. As a general trend, the change in reflectance before and after laser printing in the visible light wavelength region is smaller than the change in reflectance before and after laser printing in the near-infrared region. It is thought that it is possible to draw characters, images, etc., which are relatively difficult to see with a typical camera.

Next, six types of near-infrared absorption having mutually different cesium tungsten oxide (Cs _0.33 WO ₃ ) contents (contents) of 0.5% to 6% by weight were applied to woodfree paper as a base sheet. Offset printing was performed using a polar ink, and the reflectance of electromagnetic waves in the visible to near-infrared wavelength region of the printed surface (near-infrared absorbing ink layer) of each printed matter was measured. The definition of reflectance and the equipment used for reflectance measurement are the same as those in Examples 1 to 4 described above.

(Examples 5-10)
A dispersion liquid containing cesium tungsten oxide Cs _0.33 WO ₃ , monomers, synthetic resins, auxiliaries, etc., is prepared so that the weight ratio of cesium tungsten oxide to all other components is:
(Example 5) 0.5:99.5
(Example 6) 1:99
(Example 7) 1.3: 98.7
(Example 8) 2:98
(Example 9) 3:97
(Example 10) 6:94
Six types of ink with a cesium tungsten oxide content of 0.5% by weight to 6% by weight were prepared by mixing so as to obtain the following values. Using each of the cesium tungsten oxide-containing inks prepared in this manner, the above high-quality paper sheet, which is the substrate, is subjected to an offset printing machine (offset printability tester IGT C1 (manufactured by IGT Testing Systems)). was printed by The resulting six types of printed matter were used as laminates of Examples 5 to 10, and the reflectance of visible light to near infrared light at wavelengths of 400 nm to 2000 nm was measured using a JASCO V-670 ultraviolet-visible near-infrared spectrophotometer (Jasco Corp. (manufactured).

FIG. 38 shows the results of reflectance measurements performed in Examples 5 to 10 above. In the graph of FIG. 38, the value on the horizontal axis is the wavelength (nm) of the electromagnetic wave, and the value on the vertical axis is the reflectance (%) of the electromagnetic wave of the wavelength indicated by the value on the horizontal axis on the printed surface. It can be seen that, at least in the near-infrared wavelength region, the reflectance at the same wavelength decreases as the content of tungsten cesium oxide increases. A similar tendency can be read in the visible light wavelength range. That is, as the content of cesium tungsten oxide in the ink is increased, the image or the like printed by offset printing using the ink becomes easier to recognize using a near-infrared camera or the like. Since the rate is also low, the possibility of being visible with the naked eye or a general camera increases, and it is considered preferable to select an appropriate content of cesium tungsten oxide from the viewpoint of security.

Next, offset printing was performed on PC (polycarbonate) as a base material sheet using a near-infrared absorbing ink having a lanthanum hexaboride (LaB ₆ ) content (content rate) of 0.3% by weight. Laser marking was performed on the printed matter using a laser marker device, and the reflectance of electromagnetic waves in the visible to near-infrared wavelength range was measured for the marked and non-marked portions. Also in this embodiment, the reflectance is the ratio of the intensity of the reflected light when the irradiated light is reflected on the surface of the printed material, and It is the ratio of the intensity of reflected light from the surface of the target printed material (value obtained by measurement using a JASCO V-670 UV-visible-near-infrared spectrophotometer (manufactured by JASCO Corporation)).

を用い、波長１０６４ｎｍのＮｄ：ＹＡＧレーザーによるレーザー光によって上記印刷面にレーザー印字を行った。 レーザー印字された部分の、波長４００ｎｍ～２０００ｎｍにおける可視光～近赤外線の反射率を、ＪＡＳＣＯ Ｖ－６７０ 紫外可視近赤外分光光度計（日本分光株式会社製）を用いて測定した。 (Example 11)
A dispersion liquid containing lanthanum hexaboride (LaB ₆ ), monomers, synthetic resins, auxiliaries and the like were mixed so that the weight ratio of lanthanum hexaboride to all other components was 0.3:99.7. An ink having a lanthanum hexaboride content of 0.3% by weight was prepared by mixing so that the contents were equal to each other. Using the lanthanum hexaboride-containing ink thus produced, printing was performed on a PC (polycarbonate) sheet as a substrate by an offset printing machine (offset printability tester IGT C1 (manufactured by IGT Testing Systems)). rice field. The obtained printed matter was used as the laminate of Example 11, and the reflectance of visible light to near infrared rays at a wavelength of 400 nm to 2000 nm on the printed surface before laser printing was measured with a JASCO V-670 ultraviolet visible near infrared spectrophotometer (Japan Spectroscopy Co., Ltd.). Furthermore, as a laser marker device,

was used to perform laser printing on the printed surface with laser light from an Nd:YAG laser with a wavelength of 1064 nm. Visible to near-infrared reflectance at wavelengths of 400 nm to 2000 nm of the laser-printed portion was measured using a JASCO V-670 ultraviolet-visible-near-infrared spectrophotometer (manufactured by JASCO Corporation).

FIG. 39 shows the results of reflectance measurement performed in Example 11 above. In the graph of FIG. 39, the value on the horizontal axis is the wavelength (nm) of the electromagnetic wave, and the value on the vertical axis is the reflectance (%) of the electromagnetic wave of the wavelength indicated by the value on the horizontal axis on the printed surface or laser-printed portion. is.

As is clear from the graph of FIG. 39, laser printing increases the reflectance (decreases the absorptivity) in the near-infrared region. Although the amount of increase varies depending on the wavelength on the horizontal axis, it can be seen that the reflectance increases by approximately 5% to 14% in the near-infrared region of 780 nm to 1400 nm due to laser printing. As an overall trend, the change in reflectance before and after laser printing in the visible light wavelength range is smaller than the change in reflectance before and after laser printing in the near-infrared region of about 800 nm to 1200 nm. Therefore, it is thought that characters, images, etc., which are relatively difficult to see with the naked eye or with a general camera, can be drawn.

(Example of use)
In one example, the laminate in each of the above-described embodiments and examples can be used as a printed matter such as an identification card with high security. In FIG. 40, a person image 2A and person identification information 3A drawn by laser marking (visible with the naked eye), a person image 6A and person identification information 7A drawn by laser marking on the near-infrared absorption layer (by an infrared camera or the like). recognizable) to determine whether the person (visible information) indicated by the person image 2A and person identification information 3A matches the person (infrared information) indicated by the person image 6A and person identification information 7A. Then, the authenticity of the identification card, etc. is determined (if they match, the identification card, etc. can be determined to be genuine; if they do not match, the identification card, etc. will be determined not to be genuine) can be done.), which can be detected if it is forged. The pattern drawn by the laser may be not only monotonous patterns such as bar codes, numbers, and two-dimensional codes, but also images of people as described above. In addition, by combining with security technology for minute display printing such as micro characters, the security of infrared absorbing printed matter can be further improved.

(Aspect 3)
(explanation of terms)
First, the meaning of terms used in the description of the embodiments will be described. "Near-infrared radiation" refers to electromagnetic waves having a wavelength of 780 nm to 2000 nm (according to "JIS Z 8117:2002 Terms of Far Infrared Rays"). The “near-infrared laser beam” is a laser beam having a wavelength within the near-infrared wavelength range. "Visible light" is an electromagnetic wave having a wavelength of 400 nm to 780 nm. "Near-infrared absorptivity" is the property of absorbing at least part of the irradiated near-infrared rays, and "near-infrared permeability" is the property of transmitting at least part of the irradiated near-infrared rays. “Visible light absorptivity” is a property of absorbing at least a portion of irradiated visible light, and “visible light transmittance” is a property of transmitting at least a portion of irradiated visible light. "Laser marking" on the near-infrared absorption layer with a near-infrared laser beam means that by irradiating the near-infrared absorption layer with a near-infrared laser beam to change the near-infrared absorption characteristics of the near-infrared absorption layer, characters can be marked. , numbers, symbols, patterns, photographs, or any combination thereof, is formed on the near-infrared absorbing layer. A "latent image" is an image formed so as to be invisible to the naked eye, ie, invisible in the visible light range. In the laser marking of aspect 3 of the present invention, a detectable image is formed by using near-infrared light due to changes in the absorption properties of the near-infrared absorbing layer, but since this is not visible in the visible light region, a latent image is a kind of

Hereinafter, embodiments of mode 3 of the present invention will be described with reference to the drawings. Aspect 3 of the present invention is a latent image forming method 300B that uses a laser marker device 200B to form a latent image corresponding to a printed image on the laminate 100B. The structure of the laminate 100B, the laser marker device 200B, and the latent image forming method 300B will be described. The laminate 100B is typically a sheet or plate in which a plurality of layers are laminated, on which information for identifying an individual such as an identification card is printed. The application can be, for example, various security printed materials such as cards such as credit cards and cash cards, data pages such as driver's licenses and passports, banknotes, and the like.

(Structure of laminate 100B)
The layer structure of the laminate 100B will be described below with reference to a front view and a cross-sectional view. FIG. 76 shows a front view of a laminate 100B on which a latent image is to be formed by the latent image forming method 300B according to the embodiment of aspect 3 of the present invention. In FIG. 76, the layers formed in the printing process are indicated by dashed lines, and these layers are shown superimposed. In order to show an example of the layer structure of the laminate 100B shown in FIG. 76, FIG. 81 shows a view of the laminate 100B, the front of which is shown in FIG. It is In FIG. 81, each layer is separated to show the laminated structure of layers, but in reality, each layer is pressed and adhered. In the example shown in FIG. 81, the laminate 100B includes an upper oversheet layer 101B, a near-infrared absorbing layer 102B, a colored ink layer 103B, a substrate layer 104B, and a lower oversheet layer 105B, which are laminated in this order from the upper surface. formed by Each layer of the layered product 100B will be described with a focus on the base layer 104B that is used as a substrate during actual manufacturing. The direction toward the surface of the laminate 100B is the upward direction, and the direction toward the back surface is the downward direction.

The base layer 104B has a card-like or sheet-like configuration that maintains the shape of the laminate 100B, and is made of PVC (polyvinyl chloride), PET-G (copolyester), PC (polycarbonate), PET (polyethylene terephthalate), It is a layer of a sheet-shaped resin substrate made of a resin such as PP (polypropylene). The base material layer 104B is typically a white sheet that is the color of resin, but may be formed as a transparent sheet. polyester), PC (polycarbonate), PET (polyethylene terephthalate), PP (polypropylene), and the like. The substrate layer 104B is preferably of white or colorless construction, but can also be light colored.

A colored ink layer 103B is laminated on the base material layer 104B. The colored ink layer 103B is a layer formed with colored ink for forming an image identifiable in the visible light region. The colored ink layer 103B is a layer used to indicate visible image information, but is not necessarily essential in light of the purpose of the third aspect of the present invention, which is to form a latent image. The colored ink layer 103B preferably has near-infrared transmittance to transmit at least a part of near-infrared rays out of the irradiated near-infrared rays. Examples of colored ink include UV SOYBI SG Yellow (manufactured by DIC Graphics), UV SOYBI SG Red (manufactured by DIC Graphics), UV SOYBI SG Indigo (manufactured by DIC Graphics), UV 161 Yellow S (manufactured by T&K TOKA), Near-infrared transmitting colored inks (visible light absorbing colored inks) such as UV 161 Red S (manufactured by T&K TOKA) and UV 161 Indigo S (manufactured by T&K TOKA) can be used. The colored ink may be fluorescent ink that is colorless in the visible light region but emits light when irradiated with excitation light, or colored ink containing fluorescent ink. In place of the colored ink layer 103B or in addition to the colored ink layer 103B, UV fluorescent medium B (manufactured by T&K TOKA), UV fluorescent medium Y (manufactured by T&K TOKA), UV fluorescent medium R (manufactured by T&K TOKA), etc. A near-infrared transparent fluorescent ink may be used to form the fluorescent ink layer 103AB (not shown). The fluorescent ink layer 103AB can be formed by performing printing or the like on the base material layer 104B using a fluorescent ink composition in the same manner as the colored ink layer 103B. Personal identification information and the like can be printed. Alternatively, instead of the colored ink layer 103B and the fluorescent ink layer 103AB, or in addition to at least one of these layers, a near-infrared transmitting hologram layer 103BB (not shown) such as a transparent hologram is formed. good too. The colored ink layer 103B is formed by applying colored ink so as to represent an image pattern by a method such as offset printing, silk screen printing, gravure printing, flexographic printing, or inkjet printing. The colored ink layer 103B may be applied with colored ink only at positions where a color different from that of the base layer 104B is to be developed. For example, if the base material layer 104B is white, it is possible not to apply colored ink to the white positions. In this case, the colored ink layer 103B exists only at the position where the pattern of the image to be visually recognized exists. The colored ink layer 103B preferably has near-infrared transmittance to transmit at least a part of near-infrared rays out of the irradiated near-infrared rays. The colored ink layer 103B can be a layer having any configuration that can form an image that can be identified in the visible light region. For example, the colored ink layer 103B can be replaced with a fluorescent ink layer 103AB or a hologram layer 103BB. Alternatively, a fluorescent ink layer 103AB or a hologram layer 103BB may be laminated on the colored ink layer 103B.

A visible light image can be formed on the laminate 100B by the colored ink layer 103B. The laminate 100B is in the form of an ID card with a photograph printed on its surface. FIG. 77 shows the front of the layered product 100B as an observation image (visible light image) under visible light. When the laminate 100B is observed from the front with visible light, the upper oversheet layer 101B on the outermost surface of the laminate 100B is transparent, and the near-infrared absorption layer 102B is also transparent in the visible light region. The image formed on the colored ink layer 103B formed on the upper side can be visually recognized. A person image 111B, person identification information 112B, and a mark image 113B are formed on the colored ink layer 103B from the left. The person image 111B is a photograph image of the owner of the ID card. The person identification information 112B is an image of characters representing the identification information of the ID card owner, typically an image of characters such as the ID card owner's name and ID number. The mark image 113B is typically an image of a design or mark indicating the type of ID card, issuer, etc. In this example, it is an image of a design of the sun.

A near-infrared absorbing layer 102B is preferably laminated on the substrate layer 104B so as to at least partially overlap the colored ink layer 103B. The near-infrared absorbing layer 102B is a layer formed of a near-infrared absorbing ink having near-infrared absorbing properties, and provides a layer that is invisible to the naked eye but visible when using a near-infrared visualizing device such as a near-infrared camera. At the same time, the structure is such that a latent image is formed in the layer. The near-infrared absorbing ink contains at least one of cesium tungsten oxide and lanthanum hexaboride, which are near-infrared absorbing materials. As the cesium tungsten oxide-containing ink composition, an ink containing cesium tungsten oxide represented by the chemical formula (general formula) Cs _x W _y O _z (x, y, z are positive real numbers) can be used. . As an example, an ink containing fine particles represented by Cs _0.33 WO ₃ having a hexagonal crystal structure, described in Patent Document 8 (Japanese Patent No. 6160830), can be used. As the lanthanum hexaboride-containing ink composition, an ink containing fine particles represented by the chemical formula LaB ₆ can be used. The near-infrared absorbing ink contains, in addition to cesium tungsten oxide or lanthanum hexaboride, dispersants, monomers, synthetic resins, auxiliaries, and the like. The content of cesium tungsten oxide in the cesium tungsten oxide-containing ink is arbitrary, but in one example, it has been confirmed that good properties are obtained at a content of 0.5% by weight (weight percent) to 6% by weight. The content of lanthanum hexaboride in the lanthanum hexaboride-containing ink is also arbitrary, and in one example may be from 0.05 wt% (weight percent) to 6 wt%, but at a content of 0.3 wt% It has been confirmed to have good properties. Even when a near-infrared absorbing ink containing both cesium tungsten oxide and lanthanum hexaboride is used, the content of each of cesium tungsten oxide and lanthanum hexaboride is similarly arbitrary. In any case, the preferred content can be changed depending on the printing density (height). The "content of cesium tungsten oxide (% by weight)" as used herein is the weight ratio of cesium tungsten oxide contained in the ink to the total weight of the ink, and the content of cesium tungsten oxide in the ink. Ratio (% by weight)={(weight of cesium tungsten oxide)/(weight of total ink)}×100. Similarly, the “content of lanthanum hexaboride (% by weight)” is the ratio of the weight of lanthanum hexaboride contained in the ink to the total weight of the ink. Content (% by weight)={(weight of lanthanum hexaboride)/(weight of entire ink)}×100.

The near-infrared absorbing layer 102B is formed on the base material layer 104B and the colored ink layer 103B by a method such as printing in the shape of an infrared-absorbing printed image 114B having a predetermined two-dimensional shape when viewed from the surface of the near-infrared absorbing ink. It is formed by coating. Printing for forming the near-infrared absorption layer 102B can use various known printing methods including offset printing, silk screen printing, and the like. It should be noted that any layer forming method other than printing can also be used. Moreover, when the colored ink layer 103B and the near-infrared absorbing layer 102B are at least partially overlapped, the stacking order thereof can be changed. In addition, a plurality of layers can also be configured as one layer by kneading and integrating their constituent substances. For example, the substrate layer 104B and the near-infrared absorption layer 102B can be formed as an integral layer by kneading a near-infrared absorbing material with the resin substrate of the substrate layer 104B. Furthermore, the oversheet layer and the near-infrared absorbing layer 102B may be formed as an integrated layer by kneading a near-infrared absorbing material with the resin base material of the oversheet layer, which will be described later.

An example of near-infrared absorbing ink prepared for forming the near-infrared absorbing layer 102B by offset printing in the laminate 100B is shown. A dispersion containing cesium tungsten oxide Cs _0.33 WO ₃ and an ink medium containing monomers, synthetic resins, and other non-infrared absorbing materials were prepared so that the weight ratio of cesium tungsten oxide to all other components was 2:98. An ink containing 2.0% by weight of cesium tungsten oxide is prepared by mixing the ingredients so that the contents of the cesium tungsten oxide are 2.0% by weight. Using the cesium tungsten oxide-containing ink thus produced, printing is performed on the substrate layer 104B by an offset printing machine (for example, an offset printability tester IGT C1 (manufactured by IGT Testing Systems)), whereby near-infrared rays An absorbing layer 102B may be formed. The film thickness is about 1 μm to 3 μm. In addition, the infrared absorption rate is about 30% to 40%.

An example of near-infrared absorbing ink prepared for forming the near-infrared absorbing layer 102B by silk screen printing in the laminate 100B is shown. A dispersion liquid containing cesium tungsten oxide and a solvent-based silk screen ink medium containing a synthetic resin, a thickening agent, etc. were prepared so that the weight ratio of cesium tungsten oxide to all other components was 0.6:99.4. An ink having a cesium tungsten oxide content of 0.6% by weight was prepared by mixing so that the contents were equal to each other. Since the thickness of the near-infrared absorption layer 102B formed by silk screen printing is 3 to 4 times that in offset printing, cesium tungsten oxide is added so that the infrared absorption rate is the same as in offset printing. The ratio is set to 1/3 to 1/4 of that in offset printing. The near-infrared absorbing layer 102B can be formed by printing the substrate layer 104B with the cesium tungsten oxide-containing ink prepared in this manner using a silk screen printer. The film thickness is about 3 μm to 12 μm, and the infrared absorption rate is about 30% to 40% as in the case of offset printing.

FIG. 78 shows the front of the laminate 100B as an observation image (near-infrared image) by a near-infrared camera. Observing the laminate 100B from the front with near-infrared rays, the upper oversheet layer 101B on the outermost surface of the laminate 100B is also transparent to the near-infrared rays, so that it is formed above the base layer 104B that does not absorb near-infrared rays. The shape of the near-infrared absorbing layer 102B, that is, the infrared absorbing printed image 114B can be confirmed as a dark area. As a result, the infrared absorbing printed image 114B can be confirmed when observed with near-infrared rays. In the examples of FIGS. 76 and 78, the near-infrared absorption layer 102B has a two-dimensional shape of a vertically elongated ten-pointed star. By forming the colored ink layer 103B and the near-infrared absorption layer 102B overlaid, it is possible to display a different image in the near-infrared region where an identifiable image in the visible region was visible.

A near-infrared absorptive ink composition containing cesium tungsten oxide or lanthanum hexaboride has the property that, when exposed to near-infrared laser light, the near-infrared absorptivity at least in a predetermined wavelength range decreases and the reflectance increases. have. Therefore, the near-infrared absorption layer 102B is scanned with a near-infrared laser beam using a laser marker device 200B while controlling the irradiation so as to draw a printed image, thereby changing the near-infrared absorption characteristics of the near-infrared absorption layer. As a result, a latent image of the printed image that can be recognized using a near-infrared camera or the like can be formed, and laser marking can be performed. It is considered that the increase in near-infrared reflectance due to the decrease in near-infrared absorption is caused by the decrease in near-infrared absorption, which increases the amount of near-infrared rays that pass through and are reflected by the layer below. Laser marking typically increases the near-infrared reflectance by decreasing the near-infrared absorption of the near-infrared absorbing ink, and the area can be observed as a bright area when observed with the near-infrared. Become. The printed image can include letters, numbers, symbols, patterns, photographs, or any combination thereof. By scanning while irradiating the near-infrared laser light so as to draw a printed image, the near-infrared absorption characteristics of the drawn portion change. As a result, a latent image of a print image that can be recognized using a near-infrared camera or the like is formed on the near-infrared absorbing layer 102B. FIG. 79 shows a front view of an observed image (near-infrared image) of the laminated body 100B on which laser marking is performed by a near-infrared camera. A latent image is formed on the near-infrared absorption layer 102B by laser marking due to the difference in near-infrared absorption characteristics. In this example, microcharacters 115B and person images 116B are formed by laser marking. FIG. 80 shows an enlarged micro character 115B. The microcharacter 115B functions as a fine security design. The microcharacters can be arbitrary character information, but in this example, they are personal identification information such as the name and ID number that represent the identification information of the ID card owner. As a security design, in addition to the microcharacters 115B, colored patterns, fine symbols, relief patterns, and the like can be used. Although the size of individual characters such as microcharacters and fine symbols is arbitrary, the maximum diameter, maximum width, or maximum height can be about 1000 μm (micrometers). Incidentally, the micro characters 115B are not based on laser marking, but when the near-infrared absorbing ink is used to print the near-infrared absorbing layer 102B (microscopic display printing), the near-infrared absorbing ink is typically applied to the position of the shape. It can also be formed as part of the shape of the infrared absorbing printed image 114B by not applying it to the surface.

Preferably, an oversheet layer is formed as the outermost layer of the laminate 100B. The uppermost layer of the laminate 100B is formed by laminating an upper oversheet layer 101B having visible light permeability and near infrared ray permeability, and the lowermost layer of the laminate 100B is formed by laminating visible light permeability and near infrared rays. A transparent lower oversheet layer 105B is formed by lamination. The upper oversheet layer 101B and the lower oversheet layer 105B are layers for protecting the surface of the laminate 100B, and are composed of transparent resin sheets. The upper oversheet layer 101B and the lower oversheet layer 105B are, for example, transparent resin sheets such as transparent PC (polycarbonate) having a thickness of about 0.05 mm to 0.2 mm, and the laminate 100B before laminating them. One layer is placed on each of the bottom layer and the top layer, and the layers are laminated by applying heat and pressure to fuse them, or by bonding them with an adhesive or a pressure-sensitive adhesive, etc., to form a part of the laminate 100B. Form. Upper oversheet layer 101B and lower oversheet layer 105B are not necessarily required if protection is not required, and either one or none of them may be formed. The presence of the oversheet layer not only improves durability such as abrasion resistance, but also makes it difficult for the laser marking information to be tampered with by arranging the laser marking information in the laminate. be.

Laminate 100B may also include additional layers. FIG. 82 shows an example in which a laser coloring layer 106B is laminated between the base material layer 104B and the lower oversheet layer 105B. The laser coloring layer 106B is a transparent layer containing a laser coloring agent, and is a layer capable of forming a visible image by causing the laser coloring agent to develop colors by irradiation with a YAG laser or the like. By adding the laser coloring layer 106B, a visible image or the like can be formed by laser marking using a laser marker device 200B for forming a latent image. The layered product 100B can be layered with any functional layers other than the laser coloring layer 106B.

(Laser marker device 200B)
Next, the structure of the laser marker device 200B for laser marking will be described. FIG. 83 shows an overview of the appearance of the laser marker device 200B. The laser marker device 200B has an insertion opening 210B into which the laminate 100B to be laser-marked is inserted. To support. The support means 211B can be a mechanical holding mechanism or the like that holds the card. Then, near-infrared laser light from a laser light irradiation unit 204B inside the laser marker device 200B irradiates near-infrared laser light onto the position of the printed image in the near-infrared absorption layer 102B. FIG. 84 shows a schematic block diagram of the laser marker device 200B. The laser marker device 200B is composed of a control section 201B, a storage section 202B, a drive section 203B, a laser beam irradiation section 204B, and the like. The control unit 201B is a processing circuit for executing various functions for controlling the operation of the laser marker device 200B. It is composed of a RAM (not shown) and the like used. The storage unit 202B is typically a nonvolatile memory such as a flash ROM, and stores computer programs and control data. The storage unit 202B stores a control program 202aB as a computer program. Note that when the control program 202aB is executed, an OS (Operating System) is normally used, but the functions of the OS are included in the functions of the processor, and are omitted here. . Various functions of the latent image forming method 300B according to aspect 3 of the present invention are executed by reading out the control program 202aB from the storage unit 202B by the control unit 201B, so that execution modules corresponding to such functions are It is realized by being formed. The storage unit 202B stores scanning parameters 202bB and image data 202cB as control data. The scanning parameter 202bB is a parameter that defines scanning conditions for driving the laser beam irradiation unit 204B so as to scan while irradiating the near-infrared laser beam, and can be set by the user. As the scanning parameters 202bB, power P, frequency F, speed V, line width LW, etc. are used, which will be described in detail later. The image data 202cB is data representing a printed image, which is an image formed as a latent image in the near-infrared absorption layer 102B by laser marking. is. Although the resolution R can also be understood as a parameter that defines scanning conditions, it can be set as the resolution of the print image, in which case it is not necessary to store it separately as the scanning parameter 202bB. The image data 202cB may include positional information indicating where the print image is to be formed in the two-dimensional plane of the laminate 100B. The processor included in the control unit 201B reads the control program 202aB stored in the storage unit 202B and executes it using the work area of the RAM to read and refer to the scanning parameters 202bB and the image data 202cB. An operation for appropriately realizing various functions of the latent image forming method 300B according to aspect 3 of the present invention is executed.

The driving unit 203B defines the irradiation position of the near-infrared laser light emitted from the laser light irradiation unit 204B so that the position of the printed image in the near-infrared absorbing layer 102B in the laminate 100B is irradiated with the near-infrared laser light. It is a scanning mechanism that physically drives and scans the structure to be scanned. The driving unit 203B may not necessarily be a scanning mechanism as long as it can be positioned so that the near-infrared laser beam is applied to the position of the printed image in the near-infrared absorbing layer 102B of the laminate 100B. As a scanning mechanism, there are a method of operating a mirror to deflect the near-infrared laser light, a method of moving a projection head for the near-infrared laser light, and the like. As a method using a mirror, the driving unit 203B includes a scanning mirror that performs two-dimensional scanning while reflecting the near-infrared laser light emitted from the laser light irradiation unit 204B, a motor that drives the scanning mirror, and a near-field light from the scanning mirror. A condensing lens or the like that projects infrared laser light onto the laminate 100B can be used. As a method of moving the projection head, the driving unit 203B moves the projection head facing the laminate 100B (the portion that emits the near-infrared laser beam from the laser beam irradiation unit 204B toward the laminate 100B) along the X axis and the Y axis. A driving mechanism or the like for moving in the axial direction may be used. The laser light irradiation unit 204B is a near-infrared laser light source. As a light source for the near-infrared laser, a Nd:YAG laser or the like that generates near-infrared laser light with a laser wavelength of 1064 nm can be used. In this embodiment, a Nd:YAG laser is repeatedly pulse-oscillated to generate near-infrared laser light. By controlling the drive unit 203B to scan and irradiate the near-infrared laser light emitted from the laser light irradiation unit 204B to the position where the printed image is formed in the near-infrared absorption layer 102B of the laminate 100, Laser marking is performed on the infrared absorption layer 102B. A near-infrared laser beam is typically applied to the near-infrared absorbing layer 102B from above the laminate 100B through the upper oversheet layer 101B. When the substrate layer 104B, the lower oversheet layer 105B, etc. have near-infrared transmittance, it is also possible to irradiate the lower oversheet layer 105B with a near-infrared laser beam from below the laminate 100B through the lower oversheet layer 105B. be.

という装置を使用した。レーザーマーカー装置２００Ｂは、二次元画像である印字画像の潜像を積層体１００Ｂに形成する装置であり、点状の走査位置を直線的に移動させながら、マーキングすべき走査位置に近赤外線レーザー光を照射することにより走査ラインを形成（主走査）し、次に、その直角方向に少しずつ走査ラインを移動させながら走査ラインの形成を反復（副走査）することによって、二次元の印字画像の潜像を形成する装置である。レーザーマーカー装置２００Ｂにおける近赤外線レーザー光の走査の動作を規定する条件を以下に示す。
・パワーＰ（単位 Ｗ）
・周波数Ｆ（単位 Ｈｚ）
・速さＶ（単位 ｍｍ／ｓ）
・スポット距離ＳＤ（単位 ｍｍ）
・ライン幅ＬＷ（単位 ｍｍ）
・パルス幅ＰＷ（単位 μｓ）
・解像度Ｒ（単位 ｄｐｉ）
上記の条件の内、パワーＰ、周波数Ｆ、速さＶ、ライン幅ＬＷは、ユーザが設定可能であり、走査パラメータ２０２ｂＢとして記憶部２０２Ｂに記憶される。ただし、それらのうちのいくつかを固定値とすることも可能である。解像度Ｒもユーザが設定可能であるが、通常は、画像データ２０２ｃＢの印字画像の解像度の情報として設定される。 (Latent image forming method 300B)
Next, an embodiment of the latent image forming method 300B will be described. A known device can be used as the laser marker device 200B, but in this embodiment,

used the device. The laser marker device 200B is a device that forms a latent image of a printed image, which is a two-dimensional image, on the laminate 100B. to form a scanning line (main scanning) by irradiating a two-dimensional print image. It is a device that forms a latent image. The conditions that define the scanning operation of the near-infrared laser light in the laser marker device 200B are shown below.
・Power P (unit: W)
・Frequency F (unit: Hz)
・Speed V (unit: mm/s)
・Spot distance SD (unit: mm)
・Line width LW (unit: mm)
・Pulse width PW (unit μs)
・Resolution R (unit: dpi)
Among the above conditions, the power P, the frequency F, the speed V, and the line width LW can be set by the user, and are stored in the storage section 202B as scanning parameters 202bB. However, it is also possible for some of them to be fixed values. Although the resolution R can also be set by the user, it is usually set as information on the resolution of the print image of the image data 202cB.

The power P is the output power of the light source in the laser beam irradiation section 204B of the laser marker device 200B. The frequency F is the number of pulses per unit time that the laser marker device 200B can generate pulses of near-infrared laser light during scanning, if the resolution R is not considered. The reciprocal of the frequency F is called a pulse period, and if the resolution R is not considered, the laser marker device 200B can generate a pulse of near-infrared laser light for every pulse period. The speed V is the speed at which the near-infrared laser light scans the target area, which is the portion where the printed image is arranged, on the laminate 100B (on the near-infrared absorption layer 102B). An area to be irradiated with the near-infrared laser light when the target area is scanned while being irradiated with the near-infrared laser light pulses at every pulse period of the frequency F is called an irradiable spot. Further, based on the brightness/darkness information of the pixels of the printed image corresponding to the scanning position during scanning, the area where the pulse of the near-infrared laser light is actually irradiated on the target area is called an irradiation spot. Each irradiation spot is a dot-like area on the target area irradiated with one pulse of near-infrared laser light.

The spot distance SD is the center-to-center distance between adjacent illuminable spots. The spot distance SD corresponds to speed V/frequency F, and is determined when the user sets frequency F and speed V, so it is not necessarily stored as scanning parameter 202bB.

The line width LW is typically the length in the scanning direction of an irradiation spot, which is a dot-shaped area irradiated by one pulse of near-infrared laser light. Since the duration of one pulse of the near-infrared laser light is sufficiently short relative to the speed V, the dot-shaped area, that is, the irradiation spot has a substantially circular shape. Therefore, the line width LW is almost synonymous with the diameter of the irradiation spot. In this embodiment, since the line width LW, frequency F, and speed V are not changed, in such a case, the line width LW and the like do not necessarily have to be treated as the scanning parameters 202bB that can be set by the user. .

The pulse width PW is the duration of one pulse of the near-infrared laser light emitted by pulse oscillation of the Nd:YAG laser of the laser light irradiation unit 204B, and is a condition determined by the characteristics of the oscillation circuit of the Nd:YAG laser. is. In this embodiment, the pulse width PW is a fixed value, and does not necessarily need to be set by the user and stored as the scanning parameter 202bB.

The resolution R is a numerical value that indicates how many irradiation spots can be formed per unit length (1 inch), and is a parameter that determines how finely the unit length is divided to express a printed image. . That is, the resolution R is the density with which the irradiation spots can be formed. The center-to-center distance between adjacent illuminated spots is unit length (1 inch)/resolution R. However, in reality, the irradiation spot is formed in one of the irradiable spots that exist at each spot distance SD that can be irradiated with the pulse of the near-infrared laser light on the scanning line, so the unit length / When forming two continuous irradiation spots when the resolution R is not an integral multiple of the spot distance SD, the distance from the position of the first irradiation spot is an integral multiple of the spot distance SD, and the unit length / A second illumination spot can be formed at a position spaced apart by a distance closest to the resolution as a position corresponding to unit length/resolution R. As the position corresponding to the unit length/resolution R, another distance from the position of the first irradiation spot that is an integer multiple of the spot distance SD, is equal to or greater than the unit length/resolution R, and is closest to it. It is also possible to make them correspond to positions separated from each other. An irradiation spot is a basic unit for forming a latent image of a printed image on the near-infrared absorbing layer 102B. The image data of the print image is typically expressed with the resolution R. In this way, one irradiation spot can correspond to one pixel of the printed image to be marked, and the scanning position to be marked as the irradiation spot can be specified by a simple calculation during scanning, and the marking can be performed. can be done. Preferably, the spot distance SD is smaller than the line width LW. By doing so, the position of the irradiation spot can be precisely arranged in units of the spot distance SD. FIG. 85 graphically shows the relationship between the spot distance SD, the line width LW, and the resolution R. In FIG. 85, the ◯ symbols indicate irradiable spots (only eight consecutive spots are shown), which are arranged at a spot distance SD. A shaded area within the circle symbol is an irradiable spot at a position corresponding to the resolution R, and represents an irradiation spot that is actually irradiated with the near-infrared laser beam when marking is to be performed. In the figure, the oblique lines of adjacent irradiation spots are rotated by 90 degrees. FIG. 85(1) shows the case where the center-to-center distance (unit length/resolution R) between adjacent irradiation spots is larger than the line width LW. In this case adjacent illuminated spots do not overlap. FIG. 85(2) shows a case where the center-to-center distance (unit length/resolution R) between adjacent irradiation spots is smaller than the line width LW. In this case, adjacent irradiation spots will partially overlap. Thus, in scanning, if there is a pixel of the printed image to be marked corresponding to the position of the irradiable spot existing at the position corresponding to the resolution R, a pulse of the near-infrared laser light is detected. to form an irradiation spot. If the vertical interval of each scanning line is the same as the center-to-center distance of adjacent irradiation spots in the case of resolution R, vertical sub-scanning is also performed at the same resolution R as horizontal direction. .

From the above, the outline of the operation of the laser marker device 200B is as follows. The laser marker device 200B irradiates near-infrared laser light in pulses while scanning the laminate 100B, which is a marking target. A dot-shaped area irradiated with the near-infrared laser light on the laminate 100B becomes an irradiation spot. The length of the irradiation spot in the scanning direction is the line width LW. The speed of scanning is speed V, and the laser marker device 200B can irradiate pulses of near-infrared laser light in all pulse periods at frequency F when resolution R is not considered. The center-to-center distance of the irradiable spots is referred to as spot distance SD. During scanning, the laser marker device 200B emits near-infrared laser light with a pulse width of power P to scanning positions where marking is required (scanning positions corresponding to resolution R and where pixels to be marked in the corresponding printed image exist). A latent image of a print image is formed by irradiating a dot-like area on the laminate 100B as a PW pulse to form an irradiation spot.

In this example, the latent image forming method 300B was performed by operating the laser marker device 200B under the conditions of the following numerical values (ranges).
・Power P: 2 to 9.15 W
・Frequency F: 35000Hz
・Speed V: 200mm/s
・Spot distance SD: 0.0057 mm (set by speed V/frequency F)
・Line width LW: 0.04 mm
・Pulse width PW: 1 μs (fixed value)
・Resolution R: 50 to 1100 dpi

Next, an operation flow for executing the latent image forming method 300B by the laser marker device 200B will be described. FIG. 86 graphically shows the operation flow. First, the control unit 201B reads the scanning parameters 202bB and the image data 202cB from the storage unit 202B (step S301B). The image data 202cB is data representing an image of a predetermined size corresponding to the size of the print image. The image data 202cB can be, for example, in a format such as a BMP file having a predetermined number of pixels in length and width. It is specified which position of . Further, the image data 202cB may include information on the arrangement position of the printed image, so that the printed image of an appropriate size can be arranged at an appropriate position on the laminate 100B. A region corresponding to the printed image on the laminate 100B is a scanning target region. A printed image is typically composed of pixels of binary monochrome light/dark information. In normal laser marking that develops color with visible light, the irradiated part becomes dark because it develops black color, but in the latent image forming method 300B, the irradiated part becomes brighter because the infrared reflectance increases. Therefore, the image data 202cB is preferably image data in which the information of the image to be printed is represented in monochrome and the contrast is reversed. Further, since a color image cannot be formed in the latent image forming method 300B, it is preferable to print a monochrome image. Next, the control unit 201B directs the near-infrared laser light emitted from the laser light irradiation unit 204B to the driving unit 203B at the scanning start position in the region of the near-infrared absorption layer 102B in the laminate 100B. moves the scanning position of the near-infrared laser beam (step S302B). Typically, the coordinates of the scanning start position are input by the user as a part of the image data 202cB, and the control unit 201B moves the scanning position of the near-infrared laser beam by the laser beam irradiation unit 204B to the coordinates. to control the drive unit 203B. Next, the control unit 201B scans the target area while irradiating laser light controlled based on the information of the print image included in the image data 202cB so that a latent image of the print image is formed (step S303B). . That is, while moving the scanning position of the near-infrared laser light by the laser light irradiation unit 204B based on the scanning parameter 202bB, it is turned on to mark only the pixels to be marked based on the brightness information of the pixels of the printed image of the image data 202cB. The object area is scanned while forming an irradiation spot by irradiating a laser light pulse whose off is controlled to an irradiable spot according to the resolution R of the scanning position corresponding to the pixel. Typically, the printed image is expressed with the same resolution R as the latent image, so the scanning positions (irradiable spots) that can be irradiated with pulses of laser light correspond to the respective pixels to be marked in the printed image. position), a latent image with resolution R is formed. When the line width LW is larger than the center-to-center distance (unit length/resolution R) between adjacent irradiation spots (in the state shown in FIG. 85(2)), the adjacent irradiation spots partly overlap and resolution In such a case, the irradiation spots are arranged with a density corresponding to the resolution R and at approximately equal intervals. In addition, since the irradiable spots are arranged on the scanning line for each spot distance SD, the irradiation spot is positioned at the position corresponding to the pixel to be marked (the position where the pixel to be marked is projected onto the target area). It can be formed at the position of the nearest irradiable spot, or the like. In this way, an irradiation spot corresponding to the printed image is formed in the target area with a density corresponding to the resolution R, and a latent image thereof is formed. Note that when there is a pixel to be marked in the print image, the position of the pixel in the print image corresponding to the scanning position is, for example, a print object in the print image shown in white as the person image 116B in FIG. If it is within the region to be represented. A pulse of the near-infrared laser beam is applied to a dot-like region on the near-infrared absorption layer 102B to form an irradiation spot. Since the output power of the near-infrared laser light is power P and the pulse width PW is 1 .mu.s, one pulse gives energy of power P.times.pulse width PW to the irradiation spot. It is understood that this causes some change in the near-infrared absorptive ink, lowers the near-infrared absorptance, and increases the overall near-infrared reflectance, thereby marking with a latent image. The scanning operation is continued until all scanning (main scanning and sub-scanning) of the target area is completed (step S304B).

The latent image forming method 300 was executed with the resolution R appropriately set in the range from 50 dpi to 1100 dpi, and the results of latent image formation were evaluated. 87 and 88 show conceptual diagrams for explaining the operation of scanning with the near-infrared laser light. FIG. 87 is for high resolution, and FIG. 88 is for medium resolution. In each figure, the lens symbol represents the laser light irradiation unit 204B, and the downward arrow extending therefrom is the near-infrared laser irradiated from the laser light irradiation unit 204B to the scanning position within the target region of the near-infrared absorption layer 102B. represents light. ○ (white circles) in the figure indicate irradiable spots at scanning positions corresponding to the number per unit length corresponding to the resolution R, and ● (black circles) in the figure indicate the number of irradiable spots. Since there are pixels to be marked in the printed image, the area is irradiated with the near-infrared laser beam to form an irradiation spot. In both FIGS. 87 and 88, a latent image of the print object 117B in the same print image, which is a square near the center, is formed, but due to the difference in resolution R, the densities of the irradiable spots and the irradiation spots are different. .

The power P was adjusted in the range of 2 W to 9.15 W at each resolution R to obtain the best latent image formation result. In order to form an appropriate latent image, the latent image is formed by reducing the near-infrared absorption in at least a predetermined wavelength range in the near-infrared absorbing layer 102B without coloring the base layer 104B in the visible light region. need to be able to The viewpoint of evaluation of the formation result is, first, non-visibility under visible light, which is a viewpoint of evaluation necessary because it must not be visible under visible light. Next, the visibility with a near-infrared camera, which is an evaluation viewpoint necessary for confirming that an observable latent image is formed by using the near-infrared camera. These evaluations are shown in the following table according to the evaluation values of ◯: good, Δ: fair, and ×: poor.

When the non-visibility under visible light was poor, the base layer 104B developed a color, so that the portion to be the latent image was visible. When the non-visibility under visible light was normal, the substrate layer 104B was slightly colored, and if careful attention was paid, it was possible to distinguish with the naked eye the portion that should be the latent image. From the results shown in this table, by appropriately adjusting the power P in the range of resolution R from 85 dpi to 1000 dpi, a latent image that is invisible under visible light and can be confirmed using a near-infrared camera is formed. It is understood that you can. It is understood that a particularly good latent image can be formed when the resolution R is in the range of 140 dpi to 900 dpi. When the resolution R was 50 dpi or less, even if the power P was maximized, a latent image that could be confirmed using a near-infrared camera could not be formed. It is understood that this is because if the resolution R becomes coarser than this level, an irradiation spot with a sufficient density cannot be formed. Moreover, when the resolution R is 1100 dpi or more, no matter how the power P is adjusted, it is impossible to achieve both invisibility under visible light and visibility with a near-infrared camera. This is because at a power P (2 W, shown in the table) small enough to achieve invisibility under visible light, a sufficient absorption change can be produced in the near-infrared absorptive ink in the irradiated spot. On the other hand, it is understood that the material of the substrate layer 104B of the irradiation spot develops color at a power P (3 W shown in the table) that is large enough to realize visibility with a near-infrared camera. . Thus, in the latent image forming method 300B, by setting the resolution R within a predetermined range, a latent image that cannot be visually recognized with visible light but can be confirmed with a near-infrared camera can be reliably formed on the laminate 100B. It was confirmed that Also, such a latent image forming method 300B is performed by a laser marker device 200B, thereby creating a laminate 100B having such a latent image formed thereon.

(Industrial Applicability of Aspects 1 and 2)
INDUSTRIAL APPLICABILITY The present invention can be used for ID cards such as identification cards, cards such as credit cards and cash cards, bills, etc., but is not limited to these and can be used for any laminate.
(Industrial Applicability of Aspect 3)
INDUSTRIAL APPLICABILITY The present invention can be used to improve the security of ID cards such as identification cards, cards such as credit cards and cash cards, and bills. In addition, it can be used in arbitrary laminates and media without being limited to these.

1 Laminate, information display medium (printed matter)
2 Person image (laser marking)
3 Personal identification information (laser marking)
4 Mark (colored ink printing, fluorescent ink printing, or hologram)
5 Window member (transparent resin, near-infrared absorbing material)
6 Near-infrared absorption image (within window member, near-infrared absorbing material)
7 Human image (laser marking)
8 Mark (colored ink printing, fluorescent ink printing, or hologram)
9 base layer (white sheet)
10, 11 laser coloring layer 12, 13 colored ink layer, fluorescent ink layer, or hologram layer 14, 15 over sheet layer (transparent sheet)
16 substrate intermediate layer (second part)
17 substrate intermediate layer (first part)
18 First base layer (white sheet)
19 Second base layer (white sheet)
20 Through holes 21, 22 Human image (colored ink printing, fluorescent ink printing, or hologram)
23, 24, 25 Sheet 26 Personal identification information (laser marking)
28,29 Partial human image (black ink printing)
30 Partial human image (within window member, near-infrared absorbing material)
31 Background of person image or person identification information (laser marking)
33 Lenticular lens 34 Human image (within window member, near-infrared absorbing material)
35 Personal identification information (within window member, near-infrared absorbing material)
37 Human image (colored ink print, fluorescent ink print, or hologram)
38 Personal identification information (printed with colored ink, printed with fluorescent ink, or hologram)
39 Colored ink layer, fluorescent ink layer, or hologram layer 40 Clear window (transparent resin)
40A first clear window member (transparent resin)
40B Second clear window member (transparent resin)
41 near-infrared absorbing ink layer 42 laser marker device 43 control unit 44 storage unit 45 driving (scanning) unit 46 laser irradiation unit 100 booklet IM1 printing unit (laser marking)
IM2 printing part (laser marking)
1A Laminate (printed matter)
2A Person image (laser marking)
3A Personal identification information (laser marking)
4A mark (colored ink printing, fluorescent ink printing, or hologram)
5A, 5AA, 5BA
Printed image (near-infrared absorbing ink printing)
6A Person image (laser marking)
7A Personal identification information (laser marking)
8A mark (colored ink printing, fluorescent ink printing, or hologram)
9A base layer (white sheet)
10A Laser coloring layers 10AA and 10BA
Aperture regions 11A, 12A Colored ink layer, fluorescent ink layer, or hologram layer 13A, 13AA, 13BA
Near-infrared absorbing ink layers 14A, 15A Oversheet layer (transparent sheet)
16A Laser coloring layer 17A Part of printed image (printed with near-infrared absorbing ink)
18A Micro characters included in printed images (near-infrared absorbing ink printing)
19A micro character (printed with near-infrared absorbing ink)
20A micro character (near-infrared absorbing ink printing)
21A micro letter (laser marking)
22A mark (printed with near-infrared absorbing ink)
23A Person image (laser marking)
24A substrate intermediate layer (second part)
25A substrate intermediate layer (first part)
26A first base material layer (white sheet)
27A Second base layer (white sheet)
28A, 29A, 30A
Sheet 31A Lenticular lens 32A Laser marker device 33A Control unit 34A Storage unit 35A Driving (scanning) unit 36A Laser beam irradiation unit 100A Booklet IM1 Printing unit (laser marking)
IM2 printing part (laser marking)
100B Laminate 101B Upper oversheet layer 102B Near-infrared absorption layer 103B Colored ink layer 103AB Fluorescent ink layer 103BB Hologram layer 104B Base material layer 105B Lower oversheet layer 106B Laser coloring layer 111B Person image 112B Person identification information 113B Mark image 114B Infrared absorption Printed image 115B Micro character 116B Person image 117B Printed object 200B Laser marker device 201B Control unit 202B Storage unit 202aB Control program 202bB Scanning parameter 202cB Image data 203B Drive unit 204B Laser light irradiation unit 210B Insertion port 300B Latent image forming method F Frequency LW Line width P Power PW Pulse width R Resolution SD Spot distance

Claims (39)

a transparent material having visible light transparency and near-infrared transparency;
A member for an information display medium containing a near-infrared absorbing material,
The near-infrared absorbing material contains cesium tungsten oxide or lanthanum hexaboride, and by applying a laser beam to a target portion of the information display medium member, the target portion absorbs near-infrared rays in at least a predetermined wavelength range. characterized by decreased sex,
Member for information display media. a base material;
An information display medium, comprising: the information display medium member according to claim 1, which is disposed so as to penetrate the base material portion. a laser coloring layer formed on at least one of the first surface side and the second surface side of the base material portion and containing a laser coloring agent that develops a color when exposed to laser light;
The information display medium member is arranged to penetrate the base material portion and the laser coloring layer,
The information display medium according to claim 2. characterized by further comprising a printed layer containing a near-infrared transmitting colored ink composition or fluorescent ink composition formed on at least one of the first surface side and the second surface side of the base material portion; 4. The information display medium according to claim 2 or 3. 5. The substrate according to any one of claims 2 to 4, further comprising a near-infrared transmitting hologram layer formed on at least one of the first surface side and the second surface side of the base member. Information display medium according to the item. A first surface side having visible light transmittance and near-infrared transmittance, which is formed as the outermost layer on the first surface side of the information display medium on the first surface side of the base member. a permeable layer;
A second surface side having visible light transmittance and near-infrared transmittance, which is formed as the outermost layer on the second surface side of the information display medium on the second surface side of the base member. 6. The information display medium according to any one of claims 2 to 5, further comprising at least one of a transparent layer and a transparent layer. A plurality of projections are formed in a region of at least one of the first-surface-side transmissive layer and the second-surface-side transmissive layer, which is opposite to the base material portion and at least partially overlaps with the information display medium member. 7. The information display medium according to claim 6, wherein a shaped optical element portion is formed. further comprising a substrate intermediate layer, the substrate intermediate layer comprising a first portion and a second portion;
The substrate portion includes a first substrate portion and a second substrate portion, and the first portion of the substrate intermediate layer is positioned between the first substrate portion and the second substrate portion. death,
wherein the second portion of the substrate intermediate layer is located at an end of the substrate intermediate layer and is not located between the first substrate portion and the second substrate portion;
The information display medium according to any one of claims 2 to 7. A booklet made by binding a plurality of sheets, wherein at least one of the plurality of sheets is the information display medium according to claim 8, and the information display medium is the second sheet of the base material intermediate layer. A booklet that is bound with other sheets at the part of The information display medium member includes a first partial information display portion that partially displays target information by a change in near-infrared absorption characteristics in the information display medium member,
Among the other sheets included in the booklet, the sheet of the page adjacent to the information display medium is formed on the surface of the adjacent page sheet on the information display medium side, near-infrared absorption characteristics and visible including a second partial information display unit that partially displays information of the target by changes in light absorption characteristics;
10. The target information is obtained by synthesizing the information displayed in the first partial information display section and the information displayed in the second partial information display section. Booklet body of description. A visible information display portion in which a region on the first surface side or the second surface side of the base material portion and in which the information display medium member is not arranged displays information by a change in visible light absorption characteristics. 11. The booklet according to claim 10, wherein the information displayed by the visible information display unit, the information displayed on the first partial information display unit, and the information displayed on the second partial information display unit and determining the authenticity of the information display medium by comparing the target information obtained by synthesizing the information on the information display medium. a transparent layer having visible light transparency and near-infrared transparency;
A member for an information display medium comprising a near-infrared absorbing layer containing a near-infrared absorbing ink composition containing a near-infrared absorbing material,
The near-infrared absorbing material contains cesium tungsten oxide or lanthanum hexaboride, and by applying a laser beam to a target portion of the information display medium member, the target portion absorbs near-infrared rays in at least a predetermined wavelength range. characterized by decreased sex,
Member for information display media. a base material;
A member for an information display medium containing a transmissive material having visible light transmittance and near-infrared transmittance and a near-infrared absorptive material, and disposed so as to penetrate the base material, wherein the near-infrared absorber and the information display medium member includes cesium tungsten oxide or lanthanum hexaboride. A method, characterized in that the laser light is applied so as to reduce the near-infrared absorption in the wavelength range. a base material;
A member for an information display medium containing a transmissive material having visible light transmittance and near-infrared transmittance and a near-infrared absorptive material, and disposed so as to penetrate the base material, wherein the near-infrared absorber and a member for an information display medium, wherein the magnetic material contains cesium tungsten oxide or lanthanum hexaboride;
The information display medium member includes a near-infrared information display portion that displays information by a change in near-infrared absorption characteristics in the information display medium member,
A visible information display portion in which a region on the first surface side or the second surface side of the base material portion and in which the information display medium member is not arranged displays information by a change in visible light absorption characteristics. including
The information display medium, wherein the information displayed on the near-infrared information display section and the information displayed on the visible information display section are information related to the same object. a base material;
A member for an information display medium containing a transmissive material having visible light transmittance and near-infrared transmittance and a near-infrared absorptive material, and disposed so as to penetrate the base material, wherein the near-infrared absorber and a member for an information display medium, wherein the magnetic material contains cesium tungsten oxide or lanthanum hexaboride,
The information display medium member includes a near-infrared information display portion that displays information by a change in near-infrared absorption characteristics in the information display medium member,
A visible information display portion in which a region on the first surface side or the second surface side of the base material portion and in which the information display medium member is not arranged displays information by a change in visible light absorption characteristics. including,
A method of determining the authenticity of an information display medium by comparing the display content of the near-infrared information display portion and the display content of the visible information display portion of the information display medium. a substrate layer;
a first surface side laser coloring layer formed on the first surface side of the base material layer and containing a laser coloring agent that develops a color when irradiated with a laser beam;
a near-infrared absorbing layer containing a near-infrared absorbing ink composition containing a near-infrared absorbing material, formed on the first surface side of the base material layer;
The first surface side laser coloring layer has at least one opening region, and at least part of the near-infrared absorption layer is located in the opening region, or the opening region and the near-infrared absorption layer overlaps at least partially with
The near-infrared absorbing material comprises tungsten cesium oxide or lanthanum hexaboride, and laser light is applied to a target portion of the near-infrared absorbing layer located within or overlapping the opening region. Thereby, the near-infrared absorption of the target portion at least in a predetermined wavelength range is reduced,
laminate. 17. Further comprising a first surface side printed layer containing a near-infrared transparent colored ink composition or fluorescent ink composition, formed on the first surface side of the base material layer. The laminate according to . The laminate according to claim 16 or 17, further comprising a near-infrared transmitting first surface hologram layer formed on the first surface side of the base layer. 18. The laminate according to claim 17, wherein the first surface side printed layer formed on the first surface side of the base material layer overlaps at least a portion of the near-infrared absorption layer. . 19. The laminate according to claim 18, wherein the first-surface-side hologram layer formed on the first-surface side of the base material layer overlaps at least a portion of the near-infrared absorption layer. . 21. The method according to any one of claims 16 to 20, further comprising a second surface side laser coloring layer formed on the second surface side of the base material layer and containing a laser coloring agent that develops color when exposed to laser light. The laminate according to any one of the items. A first surface side having visible light transmittance and near-infrared transmittance, which is formed as the outermost layer on the first surface side of the laminate on the first surface side of the base material layer. 22. Laminate according to any one of claims 16 to 21, characterized in that it further comprises a permeable layer. A second-surface-side transmissive layer having visible light transmittance and near-infrared transmittance, formed as the outermost layer on the second surface side of the laminate on the second surface side of the base material layer. 23. Laminate according to any one of claims 16 to 22, characterized in that it further comprises layers. A plurality of convex optical element portions are formed in an area at least partially overlapping with the near-infrared absorbing layer on a surface of the first surface-side transmissive layer opposite to the near-infrared absorbing layer. 23. The laminate of claim 22, wherein further comprising a substrate intermediate layer, the substrate intermediate layer comprising a first portion and a second portion;
The base layer includes a first base layer and a second base layer, and the first portion of the base intermediate layer is located between the first base layer and the second base layer. death,
wherein the second portion of the substrate intermediate layer is located at an end of the substrate intermediate layer and is not located between the first substrate layer and the second substrate layer;
25. Laminate according to any one of claims 16 to 24. A booklet comprising a plurality of sheets bound together, wherein at least one of the plurality of sheets is the laminate according to claim 25, and the laminate is the second portion of the substrate intermediate layer. A booklet that is bound with other sheets in the . a base layer;
a first surface side laser coloring layer formed on the first surface side of the base material layer and containing a laser coloring agent that develops a color when irradiated with a laser beam;
A near-infrared absorbing layer formed on the first surface side of the base material layer and containing a near-infrared absorbing ink composition containing a near-infrared absorbing material, wherein the near-infrared absorbing material is cesium tungsten oxide or a near-infrared absorbing layer containing lanthanum hexaboride, wherein the first surface side laser coloring layer has at least one opening region, and at least part of the near-infrared absorbing layer is contained in the opening region is located, or the opening region and the near-infrared absorbing layer at least partially overlap A method, comprising: irradiating an overlapping target portion with laser light so as to reduce the near-infrared absorption of the target portion at least in a predetermined wavelength range. a substrate layer;
A first surface side laser coloring layer formed on the first surface side of the base material layer and containing a laser coloring agent to develop a color when irradiated with a laser beam, wherein the first surface side laser coloring layer comprises at least one The first surface side laser includes a visible information display portion having two opening regions and displaying information by a change in visible light absorption characteristics in a region other than the opening region in the first surface side laser coloring layer. a coloring layer;
A near-infrared absorbing layer formed on the first surface side of the base layer and containing a near-infrared absorbing ink composition containing a near-infrared absorbing material,
the near-infrared absorbing material comprises cesium tungsten oxide or lanthanum hexaboride;
At least part of the near-infrared absorbing layer is located within the opening region, or the opening region and the near-infrared absorbing layer at least partially overlap,
A near-infrared information display unit that displays information by changes in near-infrared absorption characteristics in a region located within the opening region or overlapping with the opening region,
The authenticity of the laminate is determined by comparing the display content of the visible information display portion and the display content of the near-infrared information display portion of the laminate including the near-infrared absorbing layer. how to. A method for forming a latent image corresponding to a printed image on a laminate, comprising:
The laminate comprises a substrate layer and a near-infrared absorbing layer formed using a near-infrared absorbing ink composition containing cesium tungsten oxide or lanthanum hexaboride as a near-infrared absorbing material, The method is
a laser scanning step of scanning a target area of the laminate while irradiating a laser beam controlled based on information of the printed image so that the latent image of the printed image is formed;
The resolution when forming the latent image of the printed image is achieved by reducing the near-infrared absorption in at least a predetermined wavelength range in the near-infrared absorbing layer without causing the base layer to develop color in the visible light region. A method, characterized in that it is capable of forming said latent image. 30. The method of claim 29, wherein the laser scanning step illuminates the laser light so as to form illumination spots on the target area in a number per unit length corresponding to the resolution. The printed image is expressed in pixels of the resolution,
30. The laser scanning step scans the target region while irradiating the laser light controlled based on the brightness information of the pixels to positions on the target region corresponding to the respective pixels. The method described in . 32. The method of claim 31, wherein the printed image is a black-and-white representation of the information of the image to be printed with the light and dark reversed. 33. A method according to any one of claims 29 to 32, characterized in that said resolution ranges from 85dpi to 1000dpi. 34. A method according to any one of claims 29 to 33, characterized in that said resolution ranges from 140dpi to 900dpi. 35. A method according to any one of claims 29 to 34, wherein the wavelength of said laser light is in the near-infrared region. 36. The method of any one of claims 29-35, wherein the printed image comprises letters, numbers, symbols, graphics, photographs, or any combination thereof. 37. The method of any one of claims 29-36, wherein the substrate layer and the near-infrared absorbing layer are formed as an integral layer. A device for forming a latent image corresponding to a printed image on a laminate,
The laminate comprises a substrate layer and a near-infrared absorbing layer formed using a near-infrared absorbing ink composition containing cesium tungsten oxide or lanthanum hexaboride as a near-infrared absorbing material, The device
a support means for supporting the laminate;
laser scanning means for scanning a target area of the laminate while irradiating a laser beam controlled based on information of the printed image so that the latent image of the printed image is formed;
The resolution when forming the latent image of the printed image is achieved by reducing the near-infrared absorption in at least a predetermined wavelength range in the near-infrared absorbing layer without causing the base layer to develop color in the visible light region. A device, characterized in that it is capable of forming said latent image. A laminate on which a latent image corresponding to a printed image is formed,
The laminate comprises a substrate layer and a near-infrared absorbing layer formed using a near-infrared absorbing ink composition containing cesium tungsten oxide or lanthanum hexaboride as a near-infrared absorbing material,
The latent image of the printed image is formed by scanning a target area of the laminate while irradiating a laser beam controlled based on information of the printed image,
The resolution when forming the latent image of the printed image is achieved by reducing the near-infrared absorption in at least a predetermined wavelength range in the near-infrared absorbing layer without causing the base layer to develop color in the visible light region. A laminate capable of forming the latent image.

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