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HK1146019A1 - Anticounterfeit medium - Google Patents

Anticounterfeit medium Download PDF

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Publication number
HK1146019A1
HK1146019A1 HK10112276.8A HK10112276A HK1146019A1 HK 1146019 A1 HK1146019 A1 HK 1146019A1 HK 10112276 A HK10112276 A HK 10112276A HK 1146019 A1 HK1146019 A1 HK 1146019A1
Authority
HK
Hong Kong
Prior art keywords
mark
convex
forgery prevention
portions
sheet
Prior art date
Application number
HK10112276.8A
Other languages
Chinese (zh)
Other versions
HK1146019B (en
Inventor
饭岛惠
河村诚
永井雅人
大野博树
Original Assignee
凸版控股株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 凸版控股株式会社 filed Critical 凸版控股株式会社
Publication of HK1146019A1 publication Critical patent/HK1146019A1/en
Publication of HK1146019B publication Critical patent/HK1146019B/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—Reliefs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B42D2033/24—
    • B42D2035/20—
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/02—Viewing or reading apparatus
    • G02B27/06—Viewing or reading apparatus with moving picture effect

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  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)

Abstract

An anticounterfeit medium which is capable of easily judging authenticity using a latent image without limitation in a visible direction. The anticounterfeit medium has a display part consisting of a cyclic color scheme region (11) and a background color region (12) which are disposed in a given array in combination, and convex parts (13, 14) which are disposed in a given array to wholly or partly overlap with the cyclic color scheme region (11) and the background color region (12). Such a configuration changes colors visible by the cyclic color schemes and background colors depending on the case of observation from a normal line direction of a base material and the case of change in the observation direction from the normal line direction of the base material, thereby allowing authenticity to be judged.

Description

Forgery prevention medium
Technical Field
The present invention relates to a forgery prevention medium such as a forgery prevention sheet, and more particularly to a forgery prevention structure using a latent image.
Background
Conventionally, in securities such as prepaid cards, various admission tickets, gift certificates, and stocks, forgery crimes have been frequently made because of the wide distribution and the relative ease of appearance. In particular, in recent years, as the performance of copying machines such as color copying machines has been improved and spread, counterfeits that cannot be easily distinguished from genuine products can be relatively easily produced, and measures against counterfeiting have been demanded. Further, not only the above-mentioned securities, but also banknotes are required to be protected from forgery.
As one countermeasure against such forgery, a technique capable of discriminating the authenticity of securities or banknotes using a latent image is considered, and for example, japanese patent laid-open No. 2000-313161 discloses such a technique.
The technique disclosed in japanese patent laid-open No. 2000-313161 is: a plurality of printing wires (a printing wire) and an embossing wire (レリ - フ wire) which is arranged in parallel with the printing wire, a part of which extends in a direction perpendicular to the printing wire and has a raised cross section are provided on a sheet base material, and a latent image is visualized in a visual direction. When the substrate is viewed from the front, all the printing screen lines are visible. However, when the viewing direction is changed to a direction orthogonal to the printing screen line and the embossed screen line, the portion of the printing screen line where the embossed screen line extends is blocked by the extended embossed screen line and cannot be viewed, and the other portion of the printing screen line is visible. This makes it possible to visualize a latent image corresponding to the shape of the embossed mesh.
In this way, when a sheet base material provided with an embossed web having a raised cross section is copied, although print information including a printing web printed on a surface can be copied, the raised shape of the embossed web cannot be reproduced. Therefore, even when the viewing direction of the copy is changed, the latent image is not displayed, and thus the authenticity can be determined.
However, in the technique of providing a plurality of printing wires and embossed wires arranged side by side with the printing wires and having a raised cross section, a part of which extends in a direction orthogonal to the printing wires, on a sheet base material, and developing a latent image by the printing wires and the embossed wires, the latent image is developed only when visually recognized from a direction orthogonal to the printing wires and the embossed wires, and it is difficult to say that the discrimination of the authenticity of the latent image is easy. In particular, when the viewing direction is limited, the authenticity of the latent image may not be determined.
Disclosure of Invention
The present invention has been made in view of the above-described problems of the conventional technology, and an object of the present invention is to provide a forgery prevention medium that can easily discriminate the authenticity of a latent image without being restricted by the direction of visual recognition.
In order to achieve the above object, the present invention comprises:
a display unit in which the first and second color matching units are combined and arranged in a predetermined arrangement;
and embossed portions provided on the display portion in a predetermined arrangement so as to entirely or partially overlap the first and second color matching portions.
In the present invention configured as described above, the first and second coloring parts change the color visually recognized when viewed from the normal direction of the base material and when the viewing direction is changed from the normal direction of the base material, whereby the authenticity can be determined.
Further, the apparatus comprises: a plurality of embossing parts arranged in a predetermined arrangement; and the color matching parts are arranged on the side surfaces of the embossed parts or between the embossed parts.
Further, the apparatus comprises: a plurality of embossing parts arranged in a predetermined arrangement; and a color matching part arranged on the side surface of the embossed part or on the periphery of the vertex area.
In the present invention thus constituted, the color visually recognized by the color matching section changes when viewed from the normal direction of the base material and when the direction of observation is changed from the normal direction of the base material, whereby the authenticity can be determined.
In addition, the first color matching part is arranged on the surface of the base material,
the second color matching parts have a different color from the first color matching parts, are arranged in rows and/or columns on the first color matching parts at a constant period,
the embossing part has:
a plurality of first convex portions which are formed in a predetermined region of the first color matching portions at the constant period in parallel with the arrangement direction of the plurality of second color matching portions in rows and/or columns so that the areas of the first color matching portions and the second color matching portions are different from each other in each of two regions divided by an arbitrary center line parallel to the surface of the base material;
and a plurality of second convex portions which are formed in parallel with the arrangement direction of the plurality of second color matching portions and in rows and/or columns which are shifted from the rows and/or columns of the plurality of first convex portions, and which are formed in regions other than the predetermined region in the first color matching portion at the constant period, wherein the areas of the first color matching portion and the second color matching portion are different from each other in each of two regions which are separated by a center line parallel to the center line, and the size relationship of the areas is reversed in a region on the same direction side of the first convex portion across the center line.
In the present invention configured as described above, when the base material is viewed from the front, the plurality of second color components arranged in rows and/or columns in a color different from that of the first color components are recognized in the first color components on the surface of the base material. Although the plurality of first convex portions and the plurality of second convex portions are formed on the base material, when the base material is viewed from the front, the base material is viewed from the top side toward the bottom side of the convex shapes of the first convex portions and the second convex portions, and therefore, only the plurality of second color matching portions constituting rows and/or columns can be recognized, and a latent image is not shown. When the viewing direction is changed in a direction at an acute angle with respect to the surface of the base material from this state, only the viewing direction side of the plurality of first and second convex portions formed on the base material can be seen. In this case, since the plurality of first convex portions are formed such that the areas of the first color matching portions and the second color matching portions are different in each of two regions divided by an arbitrary center line parallel to the surface of the base material, and the plurality of second convex portions are formed such that the areas of the first color matching portions and the second color matching portions are different in each of two regions divided by a center line parallel to the center line of the first convex portions, and the size relationship of the areas is reversed in the region on the same direction side of the plurality of first convex portions with respect to the center line, when the viewing direction is changed in a direction that forms an acute angle with respect to the surface of the base material, the size relationship of the areas of the first color matching portions and the second color matching portions in the region on the viewing direction side with respect to the center line orthogonal to the viewing direction is reversed in the first convex portions and the second convex portions, thus, the colors that can be seen by the colors of the first and second color components are different from each other in the first and second convex portions, and the latent image of the plurality of first convex portions or the plurality of second convex portions appears and can be seen by the difference in the colors. In the present invention, the first convex portion and the second convex portion are formed such that the areas of the first color pattern portion and the second color pattern portion are different in each of two regions divided by an arbitrary center line parallel to the surface of the base material and the size relationship of the areas is reversed between the regions on the same direction side with the center line interposed therebetween, so that the colors visible by the color of the first color pattern portion and the color of the second color pattern portion are different in the first convex portion and the second convex portion when viewed from any direction at an acute angle with respect to the surface of the base material, and the latent image of the plurality of first convex portions or the plurality of second convex portions is visible due to the difference in the colors. In this case, since the relationship in size between the areas of the first color pattern portion and the second color pattern portion on the viewing direction side with respect to the center line is changed in each of the first convex portion and the second convex portion in accordance with the viewing direction, the relationship between the color of the background and the latent image that appears changes, and the latent image is easily recognized.
In this way, since the plurality of second color matching portions different in color from the first color matching portions are provided in the first color matching portions in rows and/or columns, the plurality of first convex portions formed in parallel with the arrangement direction of the plurality of second color matching portions in the predetermined region of the first color matching portion in rows and/or columns are each configured such that the area of the first color matching portion and the area of the second color matching portion are different in each of two regions divided by an arbitrary center line parallel to the surface of the base material, and the plurality of second convex portions formed in parallel with the arrangement direction of the plurality of second color matching portions in rows and/or columns shifted from the row and/or column of the plurality of first convex portions in regions other than the predetermined region of the first color matching portion are each configured such that the area of the first color matching portion and the area of the second color matching portion are different in each of two regions divided by a center line parallel to the center line of the first convex portions, since the size relationship of the areas is reversed in the regions on the same direction side of the plurality of first protrusions across the center line, even when the first protrusions and the second protrusions are visually recognized from any direction at an acute angle with respect to the surface of the base material, the colors that can be seen by the colors of the first color matching parts and the colors of the second color matching parts are different from each other, and the latent image of the plurality of first protrusions or the plurality of second protrusions appears and can be seen due to the difference in the colors, whereby the authenticity of the latent image can be easily determined without limiting the visual recognition direction. In addition, since the relationship in size between the areas of the first color matching parts and the second color matching parts on the viewing direction side changes with respect to the center line in each of the first convex parts and the second convex parts according to the viewing direction, the relationship between the color of the background and the latent image that appears changes, and the latent image is easily recognized.
In addition, the first color matching part is arranged on the surface of the base material,
the second color matching parts have different colors from the first color matching parts and are arranged on the first color matching parts in a matrix shape,
the embossing part has:
a first convex portion group including a plurality of convex portions which are formed in a predetermined region of the first coloring portion so as to form rows and/or columns in parallel with the arrangement direction of the plurality of second coloring portions, and which are formed so as to protrude from the surface of the base member so that the color of the first coloring portion is expressed at the top;
and a second convex portion group including a plurality of convex portions which are arranged in parallel in a row and/or a column in a region other than the predetermined region of the first coloring portion, and which protrude from the surface of the base material such that a top portion thereof includes the second coloring portion.
In the present invention configured as described above, when the base member is viewed from the front, the plurality of second color elements arranged in a matrix in a color different from that of the first color elements can be recognized in the first color elements on the surface of the base member. Although the plurality of projections projecting from the surface of the base material are formed on the base material, the plurality of second color matching parts are recognized only in a matrix form and no latent image appears when the base material is viewed from the front because the base material is viewed from the projecting direction of the projections. When the observation direction is changed in a direction at an acute angle with respect to the surface of the base from this state, the side surfaces of the plurality of projections projecting from the surface of the base are hidden from view by the projections adjacent to the observation direction side of the projections, and only the top is visible. In this case, among the plurality of convex portions, the first coloring portion is displayed at the top of the convex portions constituting the first convex portion group, and the second coloring portion having a color different from that of the first coloring portion is displayed at the top of the convex portions constituting the second convex portion group. Therefore, the latent image of the first convex portion group or the second convex portion group appears and is visible due to the difference in the color. In the present invention, since the plurality of second color matching parts are provided in a matrix form in the first color matching part, the first convex part group formed of the plurality of convex parts forming a row and/or a column in parallel with the arrangement direction of the plurality of second color matching parts is formed in the predetermined region of the first color matching part, and the second convex part group formed of the plurality of convex parts forming a row and/or a column in parallel with the arrangement direction of the plurality of convex parts forming the first convex part group is formed in the region other than the predetermined region of the first color matching part, the side surfaces of the plurality of convex parts protruding from the surface of the base material are hidden from view by the convex parts adjacent to the side of the observation direction of the convex parts and only the top parts are visible even when viewed from any direction at an acute angle with respect to the surface of the base material, and the color of the top parts of the first convex part group is different from the color of the top parts of the second convex part group, thereby, the latent image of the first convex portion group or the second convex portion group appears and can be seen.
In this way, a plurality of second matching colors different in color from the first matching colors are arranged in a matrix on the first matching colors, a first convex portion group composed of a plurality of convex portions arranged in parallel in a row and/or a column with respect to the arrangement direction of the plurality of second color components is formed in a predetermined region of the first color component, and a second convex portion group formed of a plurality of convex portions arranged in parallel in the arrangement direction of the plurality of convex portions forming the first convex portion group and forming a row and/or a column is formed in a region other than the predetermined region of the first color matching portion, therefore, even when viewed from any direction at an acute angle with respect to the surface of the base, the side surfaces of the plurality of projections projecting from the surface of the base are hidden and invisible by the projections adjacent to the side of the projection in the viewing direction, and only the top is visible, therefore, the latent image of the first convex portion group or the second convex portion group can be displayed without being limited by the observation direction, and the authenticity of the latent image can be easily judged.
The embossed portion is formed of a plurality of projections formed on a substrate having a flat surface portion so as to project in a direction normal to the flat surface portion,
the color matching section has:
a plurality of first mark portions provided on the planar portion so as to surround the convex portion in each of the plurality of convex portions;
and a second mark portion provided on the entire circumference of a side surface of a predetermined convex portion among the plurality of convex portions.
In the present invention configured as described above, since the planar portion provided with the first mark portion faces the observation direction when viewed from the direction normal to the planar portion of the base, light from the observation direction is reflected in the observation direction on the first mark portion provided on the planar portion, and the first mark portion can be clearly seen. On the other hand, since the side surface of the convex portion on which the second mark portion is provided does not face the observation direction, light from the observation direction is reflected and dispersed in a direction other than the observation direction on the second mark portion provided on the side surface of the convex portion, and only the second mark portion can be seen weakly. Therefore, when viewed from the normal direction of the planar portion of the base, only the first mark portion provided around the convex portion of the plurality of convex portions where the second mark portion is not provided can be visually recognized, and only the second mark portion can be weakly seen among the convex portions where the second mark portion is provided on the side surface of the plurality of convex portions. When the observation direction of the substrate is changed from the normal direction of the planar portion of the substrate from this state, the observation direction is opposite to the side surface on which the convex portion of the second mark portion is provided. In this way, light from the observation direction is reflected in the observation direction on the second mark portion provided on the side surface of the convex portion, and the second mark portion can be clearly observed. On the other hand, since the planar portion provided with the first mark portion does not face the observation direction, light from the observation direction is reflected and dispersed in a direction other than the observation direction on the first mark portion provided on the planar portion, and the first mark portion is only weakly visible. Therefore, when the plurality of second mark portions are provided on predetermined convex portions among the plurality of convex portions so as to express predetermined information to be a latent image, the latent image of the second mark portion appears and is visible when the observation direction of the substrate is changed from the normal direction of the planar portion of the substrate. Here, in the present invention, since the second mark portion is provided over the entire periphery of the side surface of the convex portion, a latent image of the second mark portion appears and is visible even when the observation direction of the substrate is changed in any direction from the normal direction of the planar portion of the substrate.
When the plurality of convex portions are close to each other, and the observation direction of the substrate is changed from the normal direction of the planar portion of the substrate, the first mark portion provided on the planar portion is hidden and invisible by the convex portion adjacent to the side of the convex portion surrounded by the first mark portion in the observation direction, and only the latent image of the second mark portion is easily visible.
In this way, since the second mark portion constituting the latent image to be visualized is provided over the entire periphery of the side surface of the convex portion formed on the base material, when the observation direction is inclined from the normal direction of the planar portion of the base material, the latent image is visualized without being restricted by the observation direction, and the authenticity of the latent image can be easily discriminated.
The embossed portion is formed of a plurality of projections formed in a matrix shape and projecting from the surface of the base material,
the color matching section has:
a first mark portion provided at a position of a predetermined convex portion of the plurality of convex portions, the position being a first height from the surface of the base material;
a second mark portion provided at a second height from the surface of the base material, the second height being different from the first height, of a convex portion of the plurality of convex portions on which the first mark portion is not provided,
the first mark portion and the second mark portion have similar shapes, and at least one of the first mark portion and the second mark portion is provided on the entire periphery of the side surface of the convex portion.
In the present invention configured as described above, when the base material is viewed from the front, the first mark portion and the second mark portion provided on the plurality of projections are not blocked from the viewing direction, and therefore all of the first mark portion and the second mark portion can be visually recognized. The first mark portion and the second mark portion are members having different heights from the surface of the base material, but have similar shapes and are recognized as having substantially the same shape when viewed in the height direction, and thus, it is difficult to distinguish the first mark portion from the second mark portion and recognize that the mark portions having the same shape are formed in parallel. When the observation direction is changed in a direction at an acute angle with respect to the surface of the base from this state and the angle formed with respect to the observation direction of the surface of the base is smaller than a predetermined angle, the first mark portion and the second mark portion having different heights are provided on the convex portion, and the mark portion having the low height of the convex portion is hidden by the convex portion adjacent to the observation direction side of the convex portion and is not visible, whereby only the mark portion having the high height of the convex portion can be visually recognized. Therefore, when a plurality of first mark portions are provided on predetermined ones of the plurality of convex portions so as to express predetermined information to be latent images, the latent images using the first mark portions appear and are visible when viewed from a direction at an angle smaller than a predetermined angle with respect to the surface of the base material. Here, in the present invention, at least one of the first mark portion and the second mark portion having similar shapes to each other is provided over the entire circumference of the side surface of the concave portion, and the plurality of convex portions are formed in a matrix shape, so that when viewed from any direction at an angle smaller than a predetermined angle with respect to the surface of the base material, the mark portion having a low height of the convex portion is hidden and invisible by the convex portion adjacent to the side in the viewing direction, and only the mark portion having a high height of the convex portion is visible, and thus the latent image of the first mark portion appears and is visible. Further, since the first mark portion and the second mark portion have similar shapes to each other, when the substrate is viewed from the front, it is difficult to distinguish the first mark portion from the second mark portion, and a latent image using the first mark portion can be made difficult to recognize.
In this way, a plurality of projections projecting from the surface of the base material are provided in a matrix form, the first mark portion is provided at a position of a predetermined projection among the plurality of projections, which has a first height, and a second mark portion is provided at a position of a second height from the surface of the base material on a side surface of the convex portion where the first mark portion is not provided among the plurality of convex portions, the second height is different from the first height, the first mark part and the second mark part are similar to each other in shape, at least one of them is arranged on the whole circumference of the side surface of the convex part, therefore, when viewed from any direction at an angle smaller than a predetermined angle with respect to the surface of the base material, only the mark portion having a low height of the convex portion of the first mark portion and the second mark portion is hidden and invisible by the convex portion adjacent to the observation direction side, thus, the latent image using the first mark portion can be displayed without being restricted by the observation direction, and the authenticity of the latent image can be easily determined. Further, since the first mark portion and the second mark portion have similar shapes to each other, when the substrate is viewed from the front, it is difficult to distinguish the first mark portion from the second mark portion, and a latent image using the first mark portion can be made difficult to recognize.
The embossed portion has a first and a second convex portion group, the first and the second convex portion group are composed of a plurality of convex portions formed on the base material and having side surfaces,
the convex portions constituting the first convex portion group and the convex portions constituting the second convex portion group have different color ratios of the color sections of the side surfaces when viewed from the same direction.
In the present invention configured as described above, when the base material is viewed from the front, although there are cases where the convex portions constituting the first convex portion group and the convex portions constituting the second convex portion group having mutually different color ratios of the side surfaces can be recognized, since the side surfaces of the convex portions do not face the observation direction, light from the observation direction is reflected on the side surfaces of the convex portions in directions other than the observation direction and dispersed, the color ratios of the side surfaces of the convex portions cannot be clearly recognized, and the recognition of the convex portions constituting the first convex portion group and the convex portions constituting the second convex portion group is unclear. When the observation direction is changed from this state in a direction at an acute angle with respect to the surface of the base material, the observation direction is opposed to the side surfaces of the plurality of convex portions. In this way, light from the observation direction is reflected in the observation direction on the side surfaces of the convex portions, and the color matching ratio of the side surfaces of the convex portions can be clearly seen. Therefore, the difference between the color tone ratios of the convex portions constituting the first convex portion group and the color tone ratios of the convex portions constituting the second convex portion group can be clearly recognized, and the convex portions constituting the first convex portion group and the convex portions constituting the second convex portion group can be clearly recognized.
Thus, for example, if the character portion is constituted by the first convex portion group and the background portion is constituted by the second convex portion group, when the observation direction is changed in a direction at an acute angle with respect to the surface of the base material, the appearance of the tone scale of the side surfaces of the plurality of convex portions changes, and the character generated by the first convex portion group appears clearly in the background of the second convex portion group. Here, since the color ratios of the side surfaces of the convex portions constituting the first convex portion group and the convex portions constituting the second convex portion group when viewed from the same direction are different from each other, the convex portions constituting the first convex portion group and the convex portions constituting the second convex portion group can be clearly distinguished from each other regardless of the change in the viewing direction in any direction that forms an acute angle with respect to the surface of the base material.
In this way, the convex portions constituting the first convex portion group and the convex portions constituting the second convex portion group, which are formed on the surface of the base material with the side surfaces, are different from each other in color tone ratio of the side surfaces when viewed from the same direction, and therefore, even when the viewing direction is changed in any direction at an acute angle with respect to the surface of the base material, the convex portions constituting the first convex portion group and the convex portions constituting the second convex portion group can be clearly distinguished from each other, and the authenticity can be easily determined without being limited by the viewing direction.
The embossed portion is formed of a plurality of concave portions recessed from the surface of the base material,
the color matching section has:
a first mark portion provided at a position of a predetermined recess among the plurality of recesses, the first mark portion being a first depth from the surface of the base material;
a second mark portion having a shape similar to the first mark portion, provided at a position of a second depth from the surface of the base material of the recess portion where the first mark portion is not provided, the second depth being different from the first depth,
at least one of the first mark and the second mark is provided on the entire circumference of the inner surface of the recess.
In the present invention configured as described above, when the base material is viewed from the front, the first mark portion and the second mark portion provided in the plurality of concave portions are not blocked from the viewing direction, and therefore all of the first mark portion and the second mark portion can be visually recognized. The first mark portion and the second mark portion have different depths from the surface of the base member, but have similar shapes when viewed in the depth direction, and are recognized as having substantially the same shape. When the observation direction is changed in a direction at an acute angle with respect to the surface of the base from this state and the angle formed with respect to the observation direction of the surface of the base is smaller than a predetermined angle, the mark portion having a deep depth in the recess is hidden by the surface of the base on the observation direction side of the recess and is not visible, among the first mark portion and the second mark portion provided in the recess so that the depths are different from each other, and thus only the mark portion having a shallow depth in the recess can be visually recognized. Therefore, when the plurality of first mark portions are provided in the predetermined concave portions among the plurality of concave portions so as to express the predetermined information to be the latent image, the latent image using the first mark portions appears and is visible when viewed from a direction at an angle smaller than the predetermined angle with respect to the surface of the base material. In the present invention, since the first mark portion and the second mark portion have similar shapes to each other and at least one of them is provided over the entire circumference of the inner surface of the recess, a latent image using the first mark portion appears and is visible when viewed from any direction at an angle smaller than a predetermined angle with respect to the surface of the base material. Further, since the first mark portion and the second mark portion have similar shapes to each other, when the substrate is viewed from the front, it is difficult to distinguish the first mark portion from the second mark portion, and a latent image using the first mark portion can be made difficult to recognize.
In this way, when viewed from any direction at an angle smaller than the predetermined angle with respect to the surface of the substrate, the first mark portion and the second mark portion constituting the latent image to be visualized are similar in shape to each other, and at least one of them is provided over the entire circumference of the inner surface of the recess formed in the substrate.
Drawings
Fig. 1a is a diagram showing the entire structure of a forgery prevention sheet of a first embodiment of a forgery prevention medium of the present invention.
Fig. 1b is a diagram illustrating a detailed structure of the forgery prevention structure illustrated in fig. 1 a.
FIG. 1c is a cross-sectional view X-X' of FIG. 1 b.
FIG. 1d is a top view of the convex portion shown in FIG. 1 b.
Fig. 1e is a plan view of the convex portion shown in fig. 1 b.
Fig. 1f is a perspective view of the convex portion shown in fig. 1b, as seen from the direction a in the figure.
Fig. 1g is a perspective view of the convex portion shown in fig. 1b, as seen from the direction a in the figure.
Fig. 2 is a view for explaining the operation of the forgery prevention sheet shown in fig. 1a to 1g when visually recognized from the front.
Fig. 3a is a view showing a state of the convex portion when the forgery-prevention sheet shown in fig. 1a to 1g is visually recognized from the direction a in fig. 1 b.
Fig. 3b is a view showing a state of the convex portion when the forgery-preventing sheet shown in fig. 1a to 1g is visually recognized from the direction a in fig. 1 b.
Fig. 3c is a view showing the view of the entire forgery prevention structure when the forgery prevention sheet shown in fig. 1a to 1g is visually recognized from the direction a in fig. 1 b.
Fig. 3d is a view showing a state of the convex portion when the forgery-prevention sheet shown in fig. 1a to 1g is visually recognized from the direction B in fig. 1B.
Fig. 3e is a view showing a state of the convex portion when the forgery-prevention sheet shown in fig. 1a to 1g is visually recognized from the direction B in fig. 1B.
Fig. 3f is a view showing the view of the entire forgery prevention structure when the forgery prevention sheet shown in fig. 1a to 1g is visually recognized from the direction B in fig. 1B.
Fig. 4a is a diagram showing the entire structure of a forgery prevention sheet of another embodiment of the forgery prevention medium of the present invention.
Fig. 4b is a diagram showing a detailed structure of the forgery prevention structure shown in fig. 4 a.
Fig. 4c is a plan view of the convex portion shown in fig. 4 b.
Fig. 4d is a plan view of the convex portion shown in fig. 4 b.
Fig. 4e is a perspective view of the convex portion shown in fig. 4b, as seen from the direction a in the figure.
Fig. 4f is a perspective view of the convex portion shown in fig. 4b, as viewed from the direction a in the figure.
Fig. 5a is a diagram showing the entire structure of a forgery prevention sheet of a third embodiment of the forgery prevention medium of the present invention.
Fig. 5b is a diagram illustrating a detailed structure of the forgery prevention structure illustrated in fig. 5 a.
Fig. 5c is a plan view of the convex portion shown in fig. 5 b.
Fig. 5d is a top view of the protrusion shown in fig. 5 b.
Fig. 5e is a perspective view of the convex portion shown in fig. 5b, as seen from the direction a in the figure.
Fig. 5f is a perspective view of the convex portion shown in fig. 5b, as viewed from the direction a in the figure.
Fig. 6a is a diagram showing the entire structure of a forgery prevention sheet of a fourth embodiment of the forgery prevention medium of the present invention.
Fig. 6b is a diagram showing a detailed structure of the forgery prevention structure shown in fig. 6 a.
Fig. 6c is a plan view of the convex portion shown in fig. 6 b.
Fig. 6d is a top view of the protrusion shown in fig. 6 b.
Fig. 6e is a perspective view of the convex portion shown in fig. 6b, as seen from the direction a in the figure.
Fig. 6f is a perspective view of the convex portion shown in fig. 6b, as viewed from the direction a in the figure.
Fig. 7a is a diagram showing the entire structure of a forgery prevention sheet of a fifth embodiment of the forgery prevention medium of the present invention.
Fig. 7b is a diagram showing a detailed structure of the forgery prevention structure shown in fig. 7 a.
Fig. 7c is a cross-sectional view a-a' shown in fig. 7 b.
Fig. 7d is a cross-sectional view B-B' shown in fig. 7B.
Fig. 7e is a diagram showing the structure of the convex portions constituting the first convex portion group for expressing a latent image.
Fig. 7f is a diagram showing the structure of the convex portions constituting the second convex portion group.
Fig. 8 is a view for explaining the operation of the forgery prevention sheet shown in fig. 7a to 7f when viewed from the front.
Fig. 9a is a view of the convex portions constituting the first convex portion group as viewed from the side when the viewing direction of the forgery-prevention sheet shown in fig. 7a to 7f is changed from the front.
Fig. 9b is a view of the convex portions constituting the second convex portion group as viewed from the side when the viewing direction of the forgery-prevention sheet shown in fig. 7a to 7f is changed from the front.
Fig. 9c is a view showing a scene of a forgery prevention structure in the forgery prevention sheet shown in fig. 7a to 7 f.
Fig. 9d is a view showing a scene of a forgery prevention structure in the forgery prevention sheet shown in fig. 7a to 7 f.
Fig. 9e is a view showing a scene of a forgery prevention structure in the forgery prevention sheet shown in fig. 7a to 7 f.
Fig. 9f is a view showing a scene of a forgery prevention structure in the forgery prevention sheet shown in fig. 7a to 7 f.
Fig. 10a is a diagram showing the entire structure of a forgery prevention sheet of a sixth embodiment of the forgery prevention medium of the present invention.
Fig. 10b is a diagram showing a detailed structure of the forgery prevention structure shown in fig. 10 a.
Fig. 10c is a cross-sectional view a-a' of fig. 10 b.
Fig. 10d is a cross-sectional view B-B' shown in fig. 10B.
Fig. 10e is a diagram showing the structure of the convex portions constituting the first convex portion group for expressing a latent image.
Fig. 10f is a diagram showing the structure of the convex portions constituting the second convex portion group.
Fig. 11a is a diagram showing the entire structure of a forgery prevention sheet of a seventh embodiment of the forgery prevention medium of the present invention.
Fig. 11b is a diagram showing a detailed structure of the forgery prevention structure shown in fig. 11 a.
FIG. 11c is a cross-sectional view A-A' of FIG. 11 b.
FIG. 11d is a cross-sectional view B-B' of FIG. 11B.
Fig. 11e is a diagram showing the structure of the convex portions constituting the first convex portion group for expressing a latent image.
Fig. 11f is a diagram showing the structure of the convex portions constituting the second convex portion group.
Fig. 12a is a diagram showing the entire structure of a forgery prevention sheet of an eighth embodiment of the forgery prevention medium of the present invention.
Fig. 12b is a diagram showing a detailed structure of the forgery prevention structure shown in fig. 12 a.
Fig. 12c is a cross-sectional view a-a' of fig. 12 b.
Fig. 12d is a cross-sectional view B-B' shown in fig. 12B.
Fig. 12e is a diagram showing the structure of the convex portions constituting the first convex portion group for expressing a latent image.
Fig. 12f is a diagram showing the structure of the convex portions constituting the second convex portion group.
Fig. 13a is a diagram showing the entire structure of a forgery prevention sheet of a ninth embodiment of the forgery prevention medium of the present invention.
Fig. 13b is a diagram showing a detailed structure of the forgery prevention structure shown in fig. 13 a.
FIG. 13c is a cross-sectional view A-A' of FIG. 13 b.
Fig. 13d is a diagram showing a structure of a convex portion provided with the inner mark shown in fig. 13 b.
Fig. 13e is a diagram showing a structure of a convex portion not provided with the inner mark shown in fig. 13 b.
Fig. 14a is a diagram for explaining a method of manufacturing the forgery-preventing sheet shown in fig. 13a to 13 e.
Fig. 14b is a diagram for explaining a method of manufacturing the forgery-preventing sheet shown in fig. 13a to 13 e.
Fig. 15a is a view showing reflection of light of the forgery prevention structure when the forgery prevention sheet shown in fig. 13a to 13e is viewed from the front.
Fig. 15b is a view showing the view of the outer and inner markers of the reflection of light shown in fig. 15 a.
Fig. 15c is a view showing the appearance of the outer circumferential mark and the inner mark of the forgery prevention structure when the forgery prevention sheet shown in fig. 13a to 13e is viewed from the front.
Fig. 16a is a view showing reflection of light of the forgery prevention structure when the observation direction of the forgery prevention sheet shown in fig. 13a to 13e is changed from the front.
Fig. 16b is a diagram showing the view of the outer and inner marks of the reflection of light shown in fig. 16 a.
Fig. 16c is a view showing the appearance of the outer circumferential marks and the inner marks of the forgery prevention structure when the observation direction of the forgery prevention sheet shown in fig. 13a to 13e is changed from the front.
Fig. 16d is a view showing the appearance of the outer circumferential marks and the inner marks of the forgery prevention structure when the observation direction of the forgery prevention sheet shown in fig. 13a to 13e is changed from the front.
Fig. 16e is a view showing the appearance of the outer circumferential marks and the inner marks of the forgery prevention structure when the observation direction of the forgery prevention sheet shown in fig. 13a to 13e is changed from the front.
Fig. 16f is a view showing the appearance of the outer circumferential marks and the inner marks of the forgery prevention structure when the observation direction of the forgery prevention sheet shown in fig. 13a to 13e is changed from the front.
Fig. 17a is a diagram showing the entire structure of a forgery prevention sheet of the tenth embodiment of the forgery prevention medium of the present invention.
Fig. 17b is a diagram showing a detailed structure of the forgery prevention structure shown in fig. 17 a.
Figure 17c is a cross-sectional view A-A' of figure 17 b.
Fig. 17d is a diagram showing a structure of a convex portion provided with the character portion mark shown in fig. 17 b.
Fig. 17e is a diagram showing a structure of a convex portion provided with the background portion mark shown in fig. 17 b.
Fig. 18a is a diagram for explaining a method of manufacturing the forgery prevention sheet shown in fig. 17a to 17 e.
Fig. 18b is a diagram for explaining a method of manufacturing the forgery prevention sheet shown in fig. 17a to 17 e.
Fig. 19a is a view seen in a cross-sectional direction for explaining the operation when the forgery prevention sheet shown in fig. 17a to 17e is viewed from the front.
Fig. 19b is a view showing a scene of the character part marks and the background part marks of the forgery prevention structure when the forgery prevention sheet shown in fig. 17a to 17e is viewed from the front.
Fig. 20a is a view, seen in cross section, illustrating the effect of the counterfeit deterrent sheet shown in fig. 17a to 17e when the direction of observation is changed from the front.
FIG. 20b is a view showing an angle θ of a direction of observation of the planar portion when the background portion mark is not visible when the direction of observation of the forgery-prevention sheet shown in FIGS. 17a to 17e is changed from the front1The figure (a).
FIG. 20c is a view showing the angle θ shown in FIG. 20b1And a diagram of the state of the character part mark is observed.
Fig. 20d is a view showing a scene of the character part marks and the background part marks of the forgery prevention structure when the observation direction of the forgery prevention sheet shown in fig. 17a to 17e is changed from the front.
Fig. 20e is a view showing a scene of the character part marks and the background part marks of the forgery prevention structure when the observation direction of the forgery prevention sheet shown in fig. 17a to 17e is changed from the front.
Fig. 20f is a view showing a scene of the character part marks and the background part marks of the forgery prevention structure when the observation direction of the forgery prevention sheet shown in fig. 17a to 17e is changed from the front.
Fig. 20g is a view showing a scene of the character part marks and the background part marks of the forgery prevention structure when the observation direction of the forgery prevention sheet shown in fig. 17a to 17e is changed from the front.
Fig. 21a is a diagram showing the entire structure of a forgery prevention sheet of the eleventh embodiment of the forgery prevention medium of the present invention.
Fig. 21b is a diagram illustrating a detailed structure of the forgery prevention structure illustrated in fig. 21 a.
Figure 21c is a cross-sectional view A-A' of figure 21 b.
Fig. 21d is a diagram showing a structure of the convex portion constituting the first convex portion group shown in fig. 21 b.
Fig. 21e is a view showing a structure of the convex portion constituting the second convex portion group shown in fig. 21 b.
Fig. 22a is a view showing reflection of light by the convex portions constituting the first convex portion group for explaining an action when the forgery prevention sheet shown in fig. 21a to 21e is viewed from the front.
Figure 22b is a diagram of a scene showing a marker of the reflection of light shown in figure 22 a.
Fig. 22c is a view showing reflection of light by the convex portions constituting the second convex portion group for explaining an action when the forgery prevention sheet shown in fig. 21a to 21e is viewed from the front.
Figure 22d is a diagram of a scene showing a marker of the reflection of light shown in figure 22 c.
Fig. 22e is a view showing a scene of a mark of the forgery prevention structure of the forgery prevention sheet shown in fig. 21a to 21 e.
Fig. 23a is a view showing reflection of light by the convex portions constituting the first convex portion group when the viewing direction of the forgery-prevention sheet shown in fig. 21a to 21e is changed from the front.
Fig. 23b is a view showing reflection of light by the convex portions constituting the second convex portion group when the viewing direction of the forgery-prevention sheet shown in fig. 21a to 21e is changed from the front.
Fig. 23c is a view showing a scene of a mark of the forgery prevention structure when the observation direction of the forgery prevention sheet shown in fig. 21a to 21e is changed from the front.
Fig. 23d is a view showing a scene of a mark of the forgery prevention structure when the observation direction of the forgery prevention sheet shown in fig. 21a to 21e is changed from the front.
Fig. 23e is a view showing a scene of a mark of the forgery prevention structure when the observation direction of the forgery prevention sheet shown in fig. 21a to 21e is changed from the front.
Fig. 23f is a view showing a scene of a mark of the forgery prevention structure when the observation direction of the forgery prevention sheet shown in fig. 21a to 21e is changed from the front.
Fig. 24a is a view showing the entire structure of a forgery prevention sheet of a twelfth embodiment of the forgery prevention medium of the present invention.
Fig. 24b is a diagram showing a detailed structure of the forgery prevention structure shown in fig. 24 a.
FIG. 24c is a cross-sectional view A-A' of FIG. 24 b.
Fig. 24d is a diagram showing a structure of a concave portion provided with the character portion marks shown in fig. 24 b.
Fig. 24e is a diagram showing a structure of a concave portion provided with the background portion mark shown in fig. 24 b.
Fig. 25a is a diagram for explaining a method of manufacturing the forgery prevention sheet shown in fig. 24a to 24 e.
Fig. 25b is a diagram for explaining a method of manufacturing the forgery prevention sheet shown in fig. 24a to 24 e.
Fig. 26a is a view seen in a cross-sectional direction for explaining the operation when the forgery prevention sheet shown in fig. 24a to 24e is viewed from the front.
Fig. 26b is a view showing a scene of the character part marks and the background part marks of the forgery prevention structure when the forgery prevention sheet shown in fig. 24a to 24e is viewed from the front.
Fig. 27a is a view, viewed in cross section, for explaining the action of the forgery prevention sheet shown in fig. 24a to 24e when the direction of observation is changed from the front.
FIG. 27b is a view showing an angle θ of a viewing direction of the flat surface portion when the background portion mark shown in FIG. 27a is not visible1The figure (a).
FIG. 27c is a view showing the angle θ shown in FIG. 27b1And a diagram of the state of the character part mark is observed.
Fig. 27d is a view showing the appearance of the character part mark and the background part mark of the forgery prevention structure.
Fig. 27e is a view showing the appearance of the character part mark and the background part mark of the forgery prevention structure.
Fig. 27f is a view showing the appearance of the character part mark and the background part mark of the forgery prevention structure.
Fig. 27g is a view showing the appearance of the character part mark and the background part mark of the forgery prevention structure.
Detailed Description
Embodiments of the present invention will be described below with reference to the drawings.
(first embodiment)
Fig. 1a is a diagram showing the overall structure of a forgery prevention sheet of a first embodiment of a forgery prevention medium of the present invention, fig. 1b is a diagram showing the detailed structure of the forgery prevention structure 10 shown in fig. 1a, fig. 1c is a cross-sectional view X-X' shown in fig. 1b, fig. 1d is a plan view of the convex portion 13 shown in fig. 1b, fig. 1e is a plan view of the convex portion 14 shown in fig. 1b, fig. 1f is a perspective view of the convex portion 13 shown in fig. 1b as viewed from the a direction in the drawing, and fig. 1g is a perspective view of the convex portion 14 shown in fig. 1b as viewed from the a direction in the drawing.
As shown in fig. 1a to 1g, the forgery prevention sheet 1 of the present embodiment is configured by providing a forgery prevention structure 10 in a local region of a sheet base material 2 made of paper. The sheet base material 2 has a planar portion 3 serving as a base material surface, an information printing region 4 is provided in a partial region of the planar portion 3, and a forgery prevention structure 10 is provided in another region. The forgery prevention sheet 1 configured as described above is considered to be used as a ticket for a concert or the like, for example. In this case, the content of the concert, the name of the concert field, the seat number, and the like are printed on the information printing area 4. In addition, before printing information on the information printing area 4 of the sheet base material 2, it is conceivable that the sheet base material 2 is subjected to a preprinting process of printing a predetermined pattern or coloring, but in this case, it is necessary to make the latent image of the forgery prevention structure 10 invisible.
In the forgery prevention structure 10 provided on the sheet base material 2, as shown in fig. 1b, a plurality of periodic color regions 11, which are second color parts and are made of black different from the background color regions 12, are provided on the background color regions 12, which are first color parts made of white having the same basic color as the planar part 3 of the sheet base material 2, to form a display part. The plurality of periodic color regions 11 are formed in a matrix by being arranged in rows and columns and at a constant period on the background color region 12.
In the area where the plurality of periodic color areas 11 are provided in a matrix form, a plurality of first convex portions 13 as embossed portions constituting the first convex portion group and a plurality of second convex portions 14 as embossed portions constituting the second convex portion group are formed. As shown in fig. 1c, 1f and 1g, the convex portions 13 and 14 have a shape in which the apex portion is removed from the cone, and the sheet base material 2 is recessed by about 0.05 to 0.1mm from the side of the planar portion 3 by an embossing plate or the like to form side surfaces 13a and 14a, and the same surface as the planar portion 3 becomes the top portions 13b and 14 b. The cross-sectional area gradually increases from the top portions 13b, 14b toward the recessed direction of the sheet base material, and the bottom portions of the convex portions 13, 14 have a circular shape with a diameter of 0.5mm or less.
The first convex portions 13 constituting the first convex portion group are formed on a predetermined region of the background color region 12 so as to express a latent image "T" by the shape of the first convex portion group. Further, projections 13 are formed at the same period as that of plurality of color scheme regions 11, and the direction of rows and columns for forming "T" is parallel to the arrangement direction of plurality of color scheme regions 11, but the rows and columns are shifted from the rows and columns of plurality of color scheme regions 11. Thus, as shown in fig. 1c, in one region divided by a center line parallel to the surface of the sheet base material 2, the area of the periodic color-matching region 11 is larger than the area of the background-color region 12, and in the other region, the area of the background-color region 12 is larger than the area of the periodic color-matching region 11, that is, in each of the two regions divided by the center line, the areas of the periodic color-matching region 11 and the background-color region 12 are different from each other. In fig. 1c, a center line orthogonal to the viewing direction in which the convex portion 13 is viewed from the direction a in fig. 1b is shown, but the center line may be parallel to the surface of the sheet base material 2, and may be arbitrarily set on the convex portion 13, and the areas of the periodically colored region 11 and the background colored region 12 of the convex portion 13 are different from each other in each of two regions divided by the arbitrarily set center line.
The plurality of convex portions 14 constituting the second convex portion group are formed so as to surround the region in which the plurality of convex portions 13 constituting the first convex portion group are formed with the background color region 12. Projections 14 are formed at the same period as that of plurality of color scheme regions 11, and the direction of the row and column is parallel to the arrangement direction of plurality of color scheme regions 11, but the row and column are shifted from the row and column of plurality of color scheme regions 11. Thus, as shown in fig. 1d, in one region divided by a center line parallel to the surface of the sheet base material 2, the area of the background color region 12 is larger than the area of the periodic color region 11, and in the other region, the area of the periodic color region 11 is larger than the area of the background color region 12, that is, in each of the two regions divided by the center line, the areas of the periodic color region 11 and the background color region 12 are different from each other. In fig. 1d, a center line orthogonal to the viewing direction in which the convex portion 14 is viewed from the direction a in fig. 1b is shown, but the center line may be parallel to the surface of the sheet base material 2, and may be arbitrarily set on the convex portion 14, and the areas of the color periodic region 11 and the background color region 12 of the convex portion 14 are different from each other in each of two regions divided by the arbitrarily set center line. The rows and columns of the plurality of projections 14 are shifted from the rows and columns of the plurality of projections 13.
As shown in fig. 1c and 1d, in the region on the same direction side with the center lines parallel to each other, among the plurality of convex portions 13 and 14, the relationship in area size between the periodic color-scheme region 11 and the background color region 12 is reversed between the convex portions 13 and 14. Specifically, in the region on the upper left side in the figure with the center line of the convex portion 13 therebetween, as shown in fig. 1c, the area of the periodic color region 11 is larger than the area of the background color region 12, and in the region on the upper left side in the figure with the center line of the convex portion 14 therebetween, as shown in fig. 1d, the area of the background color region 12 is larger than the area of the periodic color region 11, and in the region on the lower right side in the figure with the center line of the convex portion 13 therebetween, as shown in fig. 1c, the area of the background color region 12 is larger than the area of the periodic color region 11, and in the region on the lower right side in the figure with the center line of the convex portion 14 therebetween, as shown in fig. 1d, the area of the periodic color region 11 is larger than the.
In this embodiment, for convenience of explanation, the forgery prevention structure 10 is shown in the form of a matrix of 100 periodic color regions 11 of 10 × 10, and the larger the number of the periodic color regions 11, the finer the characters of the latent image that can be visualized by the forgery prevention structure 10, and the easier the expression of curves and the like.
A method for manufacturing the forgery-prevention sheet 1 configured as described above will be described below.
First, in a region of the sheet base material 2 where the forgery prevention structure 10 is provided, that is, in a region of the white background color region 12, 100 periodic color regions 11 are printed in black in a matrix of 10 × 10. The periodic color areas 11 may be printed simultaneously with the preprinting described above, or may be printed after the preprinting.
Next, in the region where the periodic color matching regions 11 are printed, the embossing plate is pressed from the side of the planar portion 3 of the sheet base material 2, thereby forming the convex portions 13 constituting the first convex portion group and the convex portions 14 constituting the second convex portion group. In the area where periodic color areas 11 are printed, projections 13 constituting the first projection group are formed so as to constitute rows and columns that are parallel to the arrangement direction of the plurality of periodic color areas 11 and are shifted from the rows and columns of the plurality of periodic color areas 11 at the same period as the plurality of periodic color areas 11 in a predetermined area where a latent image "T" is formed. In addition, convex portions 14 constituting the second convex portion group are formed so as to form rows and columns parallel to the arrangement direction of plurality of periodic color regions 11 and shifted from the rows and columns of plurality of periodic color regions 11 and plurality of convex portions 13 at the same period as plurality of periodic color regions 11 so as to surround the region where plurality of convex portions 13 constituting the first convex portion group are formed in the region where periodic color regions 11 are printed. It is considered that such convex portions 13, 14 are formed by shifting an embossing plate in which the convex portions 13 are arranged between the plurality of color-period regions 11 and the convex portions 14 are arranged on the plurality of color-period regions 11 with respect to the sheet base material 2 such that the rows and columns of the plurality of convex portions 13, 14 and the rows and columns of the color-period regions 11 are parallel to each other and shifted from each other.
After the forgery-preventing sheet 1 is manufactured as described above, information corresponding to the application is printed on the information printing area 4 of the sheet base material 2 and used.
The function of the forgery prevention sheet 1 will be described below.
First, the operation of visually recognizing the forgery prevention sheet 1 shown in fig. 1a to 1g from the front, i.e., the normal direction of the planar portion 3 of the sheet base material 2 will be described.
Fig. 2 is a view for explaining the operation when the forgery-prevention sheet 1 shown in fig. 1a to 1g is visually recognized from the front, and shows the view of the forgery-prevention structure 10.
When the forgery prevention sheet 1 shown in fig. 1a to 1g is visually recognized from the normal direction of the planar portion 3 which is the front surface, as shown in fig. 2, in the forgery prevention structure 10, the background color region 12 is white, whereas the plurality of periodic color regions 11 provided in a matrix shape on the background color region 12 are black, and therefore the plurality of periodic color regions 11 in a matrix shape can be recognized. In this case, although the plurality of projections 13 and 14 are formed on the sheet base material 2, when the forgery-preventing sheet 1 is visually recognized from the front, since the projections 13 and 14 are visually recognized from the top portions 13b and 14b sides toward the bottom portions of the projections 13 and 14, it is difficult to recognize the projections 13 and 14, the plurality of periodic color areas 11 are recognized only in a matrix form, and the latent image "T" is not displayed.
Next, an operation when the viewing direction of the forgery-prevention sheet 1 shown in fig. 1a to 1g is changed from the front side, that is, the normal direction of the planar portion 3 of the sheet base material 2 will be described.
FIG. 3a is a view showing a state of the convex portion 13 when the forgery-preventing sheet 1 shown in FIGS. 1a to 1g is visually recognized from the A direction in FIG. 1B, FIG. 3B is a view showing a state of the convex portion 14 when the forgery-preventing sheet 1 shown in FIGS. 1a to 1g is visually recognized from the A direction in FIG. 1B, FIG. 3c is a view showing an overall view of the forgery-preventing structure 10 when the forgery-preventing sheet 1 shown in FIGS. 1a to 1g is visually recognized from the A direction in FIG. 1B, FIG. 3d is a view showing a state of the convex portion 13 when the forgery-preventing sheet 1 shown in FIGS. 1a to 1g is visually recognized from the B direction in FIG. 1B, FIG. 3e is a view showing a state of the convex portion 14 when the forgery-preventing sheet 1 shown in FIGS. 1a to 1g is visually recognized from the B direction in FIG. 1B, and FIG. 3f is a view showing a state of the forgery-preventing sheet 1B direction shown in FIGS. 1a to 1g A view of the entire scene of the forgery prevention structure 10 when visually recognized. In fig. 3a to 3f, the description of periodic color region 11 and background color region 12 in the regions other than convex portions 13 and 14 is omitted for easy understanding of the operation of the present embodiment.
When the viewing direction of the forgery-prevention sheet 1 shown in fig. 1a to 1g is changed from the front side in the direction a in fig. 1b, only the side surfaces 13a and 14a and the top portions 13b and 14b on the viewing direction side, i.e., the side a in fig. 1b, of each of the plurality of convex portions 13 and 14 can be seen. As described above, as shown in fig. 1c, when the plurality of convex portions 13 are separated by the center line orthogonal to the viewing direction when viewed from the direction a in fig. 1b, the area of the periodic color areas 11 is larger than the area of the background color areas 12 in the area on the viewing direction side, and when the plurality of convex portions 14 are separated by the center line orthogonal to the viewing direction when viewed from the direction a in fig. 1b, the area of the background color areas 12 is larger than the area of the periodic color areas 11 in the area on the viewing direction side, as shown in fig. 1d, and therefore, as shown in fig. 3a and 3b, the colors visible by the colors of the periodic color areas 11 and the colors of the background color areas 12 are different from each other in the entirety on the viewing direction side of the convex portions 13 and the convex portions 14. Specifically, when the convex portion 13 is viewed from the a direction in fig. 1b, the area of the periodic color region 11 made of black is larger than the area of the background color region 12 made of white, and therefore, the display is dark gray, and when the convex portion 14 is viewed from the a direction in fig. 1b, the area of the background color region 12 made of white is larger than the area of the periodic color region 11 made of black, and therefore, the display is light gray.
As a result, as shown in fig. 3c, when the entire forgery prevention structure 10 is viewed from the direction a in fig. 1b, a dark gray latent image "T" formed by the plurality of convex portions 13 appears on a light gray background formed by the plurality of convex portions 14 and is visible.
When the viewing direction of the forgery-prevention sheet 1 shown in fig. 1a to 1g is changed from the front side in the direction B in fig. 1B, only the side surfaces 13a and 14a and the top portions 13B and 14B on the viewing direction side, that is, the side B in fig. 1B of each of the plurality of convex portions 13 and 14 can be seen. As described above, as shown in fig. 1c, when the plurality of convex portions 13 are separated by the center line orthogonal to the viewing direction when viewed from the B direction in fig. 1B, the area of the background color region 12 is larger than the area of the periodic color region 11 in the region on the viewing direction side, and when the plurality of convex portions 14 are separated by the center line orthogonal to the viewing direction when viewed from the B direction in fig. 1B, as shown in fig. 1d, the area of the periodic color region 11 is larger than the area of the background color region 12 in the region on the viewing direction side, and therefore, as shown in fig. 3d and 3e, the colors visible by the colors of the periodic color region 11 and the colors of the background color region 12 are different from each other in the entirety on the viewing direction side of the convex portions 13 and the convex portions 14. Specifically, when the convex portion 13 is viewed from the B direction in fig. 1B, the area of the background color region 12 made of white is larger than the area of the periodic color region 11 made of black, and therefore, the display is light gray, and when the convex portion 14 is viewed from the B direction in fig. 1B, the area of the periodic color region 11 made of black is larger than the area of the background color region 12 made of white, and therefore, the display is dark gray.
As a result, as shown in fig. 3f, when the entire forgery prevention structure 10 is viewed from the B direction in fig. 1B, a dark gray background formed by the plurality of convex portions 14 is seen with a light gray latent image "T" formed by the plurality of convex portions 13.
As described above, although the case of visually recognizing the forgery prevention structure 10 shown in fig. 1 from the a direction and the B direction in fig. 1B has been described, since the convex portions 13 and 14 are formed such that the areas of the periodic color regions 11 and the background color regions 12 are different from each other in each of two regions separated by an arbitrary center line parallel to the planar portion 3 and the size relationship of the areas of the convex portions 13 and the convex portions 14 is reversed in the regions on the same direction side across the center line, when the forgery prevention structure 10 is visually recognized from any direction at an acute angle with respect to the planar portion 3, the colors of the background color regions 12 and the colors of the periodic color regions 11 are different from each other in the convex portions 13 and the convex portions 14, and accordingly, due to the difference in the colors, latent images appear and are visible. As described above, since the size relationship between the areas of the background color region 12 and the periodic color region 11 on the viewing direction side is changed with respect to the center line in each of the convex portions 13 and 14 in accordance with the viewing direction, the color relationship between the latent image appearing and the background changes, and the latent image is easily recognized.
When the above-described forgery prevention sheet 1 is used for copying, the information printed on the information printing area 4 of the sheet base material 2 or the periodically colored areas 11 provided in a matrix on the sheet base material 2 by printing are copied, but the convex portions 13 and 14 cannot be reproduced. Therefore, even when the viewing direction of the copy is changed, the latent image of the first convex portion group including the plurality of convex portions 13 is not displayed, and thus the authenticity can be determined. When the authenticity is determined in this manner, in the forgery-preventing sheet 1 of the present embodiment, even when the direction of visual recognition of the forgery-preventing sheet 1 is changed in any direction from the normal direction of the flat surface portion 3 of the sheet base material 2, the latent image of the first convex portion group composed of the plurality of convex portions 13 appears and can be seen, and therefore, the authenticity of the latent image can be easily determined without being limited by the direction of visual recognition. Further, depending on the direction of visual recognition of the forgery prevention sheet 1, there may be a case where there is little difference in visible color between the raised portions 13 and 14 due to the color of the background color region 12 and the color of the periodic color region 11, but the forgery prevention function is not lost due to this because the direction of visual recognition is only a part. Further, since the convex portions 13 and 14 are formed by recessing the planar portion 3 of the sheet base material 2, when the sheet base material 2 is viewed from the front and back or is directly contacted, the convex portions 13 and 14 are difficult to be recognized, the convex portions 13 and 14 are difficult to reproduce, and the forgery prevention function can be improved.
(second embodiment)
Fig. 4a is a diagram showing the overall structure of a forgery prevention sheet of another embodiment of a forgery prevention medium of the present invention, fig. 4b is a diagram showing the detailed structure of the forgery prevention structure 110 shown in fig. 4a, fig. 4c is a plan view of the convex portion 113 shown in fig. 4b, fig. 4d is a plan view of the convex portion 114 shown in fig. 4b, fig. 4e is a perspective view of the convex portion 113 shown in fig. 4b as viewed from the direction a in the drawing, and fig. 4f is a perspective view of the convex portion 114 shown in fig. 4b as viewed from the direction a in the drawing.
As shown in fig. 4a to 4f, this embodiment is different from the embodiment shown in fig. 1a to 1g only in that a background color region 112 is provided in black in a region of the forgery prevention structure 110 of the sheet base material 102, and a white periodic color region 111 is provided in a matrix in the background color region 112. That is, the color of the background color region 112 is inverted from the color of the periodic color matching region 111, as compared to the mode shown in fig. 1a to 1 g.
In the forgery prevention sheet 101 configured as described above, when viewed from the front, only the periodic color regions 111 provided in a matrix on the black background color region 112 can be recognized in white, and the latent image "T" cannot be recognized. When the viewing direction of the forgery-prevention sheet 101 is changed from the front side in, for example, the direction a in fig. 4b, only the side surfaces 113a and 114a and the top portions 113b and 114b on the viewing direction side, i.e., the side a in fig. 4b, of each of the plurality of convex portions 113 and 114 can be seen. As described above, as shown in fig. 4c, when the plurality of protrusions 113 are separated by a center line orthogonal to the viewing direction when viewed from the direction a in fig. 4b, the area of the periodic color matching region 111 is larger than the area of the background color region 112 in the region on the viewing direction side, and as shown in fig. 4d, when the plurality of protrusions 114 are separated by a center line orthogonal to the viewing direction when viewed from the direction a in fig. 4b, the area of the background color region 112 is larger than the area of the periodic color matching region 111 in the region on the viewing direction side, and therefore, as shown in fig. 4e and 4f, the colors visible by the colors of the periodic color matching region 111 and the colors of the background color region 112 are different from each other in the entire regions on the viewing direction sides of the protrusions 113 and the protrusions 114. Specifically, when the convex part 113 is viewed from the a direction in fig. 4b, the area of the periodic color region 111 made of white is larger than the area of the background color region 112 made of black, and thus the display is light gray, and when the convex part 114 is viewed from the a direction in fig. 4b, the area of the background color region 112 made of black is larger than the area of the periodic color region 111 made of white, and thus the display is dark gray. Thus, when the entire forgery prevention structure 110 is viewed from the direction a in fig. 4b, the dark gray background formed by the plurality of protrusions 114 shows and is visible the light gray latent image "T" formed by the plurality of protrusions 113.
(third embodiment)
Fig. 5a is a diagram showing the overall structure of a forgery prevention sheet of a third embodiment of a forgery prevention medium of the present invention, fig. 5b is a diagram showing the detailed structure of the forgery prevention structure 210 shown in fig. 5a, fig. 5c is a plan view of the convex portion 213 shown in fig. 5b, fig. 5d is a plan view of the convex portion 214 shown in fig. 5b, fig. 5e is a perspective view of the convex portion 213 shown in fig. 5b as viewed from the direction a in the drawing, and fig. 5f is a perspective view of the convex portion 214 shown in fig. 5b as viewed from the direction a in the drawing.
As shown in fig. 5a to 5f, the present embodiment is different from the embodiment shown in fig. 1a to 1g only in that the size of the periodic color areas 211 provided in a matrix on the sheet base material 202 is smaller than the top portions 213b, 214b of the convex portions 213, 214.
In the forgery prevention sheet 201 configured as described above, the periodic color regions 211 provided in a matrix on the white background color region 212 are recognized only in black when viewed from the front, and the latent image "T" is not recognized. When the viewing direction of the forgery-prevention sheet 201 is changed from the front side in, for example, the direction a in fig. 5b, only the side surfaces 213a and 214a and the top surfaces 213b and 214b on the side a in fig. 5b, which are the viewing direction sides of the plurality of protrusions 213 and 214, are visible. As described above, as shown in fig. 5c, when the plurality of protrusions 213 are separated by the center line orthogonal to the viewing direction when viewed from the direction a in fig. 5b, the area of the periodic color matching region 211 is larger than the area of the background color region 212 in the region on the viewing direction side, and as shown in fig. 5d, when the plurality of protrusions 214 are separated by the center line orthogonal to the viewing direction when viewed from the direction a in fig. 5b, only the background color region 212 is included in the region on the viewing direction side, so that the visible colors are different from each other due to the color of the periodic color matching region 211 and the color of the background color region 212 in the entire viewing direction sides of the protrusions 213 and the protrusions 214 as shown in fig. 5e and 5 f. Specifically, when the convex portions 213 are visually recognized in the a direction in fig. 5b, the periodic color regions 211 made of black have a larger area than the background color regions 212 made of white and are therefore displayed in dark gray, and when the convex portions 214 are visually recognized in the a direction in fig. 5b, the regions on the visual direction side with the center line therebetween include only the background color regions 212 made of white and the portions of the top portions 214b are the periodic color regions 211 made of black and are therefore displayed in light gray. Thus, when the entire forgery prevention structure 210 is viewed from the direction a in fig. 5b, the dark gray latent image "T" formed by the plurality of protrusions 213 appears on the light gray background formed by the plurality of protrusions 214 and is visible.
(fourth embodiment)
Fig. 6a is a diagram showing the overall structure of a forgery prevention sheet of a fourth embodiment of a forgery prevention medium of the present invention, fig. 6b is a diagram showing the detailed structure of the forgery prevention structure 310 shown in fig. 6a, fig. 6c is a plan view of the convex portion 313 shown in fig. 6b, fig. 6d is a plan view of the convex portion 314 shown in fig. 6b, fig. 6e is a perspective view of the convex portion 313 shown in fig. 6b as viewed from the direction a in the drawing, and fig. 6f is a perspective view of the convex portion 314 shown in fig. 6b as viewed from the direction a in the drawing.
As shown in fig. 6a to 6f, this embodiment is different from the embodiment shown in fig. 5a to 5f only in that a background color region 312 is provided in black in a region of the forgery prevention structure 310 of the sheet base material 302, and a white periodic color region 311 is provided in a matrix in the background color region 312. That is, the color of the background color region 312 is reversed from the color of the periodic color matching region 311, as compared to the manner shown in fig. 5a to 5 f.
In the forgery prevention sheet 301 configured as described above, when viewed from the front, the periodic color-matching regions 311 provided in a matrix on the black background color region 312 can be recognized only in white, and the latent image "T" cannot be recognized. When the viewing direction of the forgery-prevention sheet 301 is changed from the front side in, for example, the direction a in fig. 6b, only the side surfaces 313a and 314a and the top portions 313b and 314b on the side a in fig. 6b, which are the viewing direction sides of the plurality of convex portions 313 and 314, are visible. As described above, as shown in fig. 6c, when the plurality of protrusions 313 are separated by the center line orthogonal to the viewing direction when viewed from the direction a in fig. 6b, the area of the periodic color matching region 311 is larger than the area of the background color region 312 in the region on the viewing direction side, and when the plurality of protrusions 314 are separated by the center line orthogonal to the viewing direction when viewed from the direction a in fig. 6b, as shown in fig. 6d, only the background color region 312 is included in the region on the viewing direction side, and therefore, as shown in fig. 6e and 6f, the visible colors are different from each other due to the color of the periodic color matching region 311 and the color of the background color region 312 in the entire viewing direction sides of the protrusions 313 and the protrusions 314. Specifically, when the projection 313 is viewed from the a direction in fig. 6b, the periodic color region 311 made of white is displayed in light gray because the area thereof is larger than the area of the background color region 312 made of black, and when the projection 314 is viewed from the a direction in fig. 6b, the region on the viewing direction side with the center line interposed therebetween includes only the background color region 312 made of black, and a part of the top portion 314b is the periodic color region 311 made of white, and is displayed in dark gray. Thus, when the entire forgery prevention structure 310 is viewed from the direction a in fig. 6b, the dark gray background formed by the plurality of protrusions 314 is seen with the light gray latent image "T" formed by the plurality of protrusions 313 appearing.
In the above embodiment, it is also conceivable that the periodic color-matching regions 11, 111, 211, 311 are divided in the circumferential direction and the colors of the divided regions are different from each other. In this case, the authenticity can be determined by changing the color that can be visually recognized according to the direction in which the forgery prevention structure 10, 110, 210, 310 is viewed.
(fifth embodiment)
Fig. 7a is a diagram showing the entire structure of a forgery prevention sheet according to a fifth embodiment of the forgery prevention medium of the present invention, fig. 7B is a diagram showing the detailed structure of the forgery prevention structure 410 shown in fig. 7a, fig. 7c is a sectional view a-a 'shown in fig. 7B, fig. 7d is a sectional view B-B' shown in fig. 7B, fig. 7e is a diagram showing the structure of a convex portion 413 constituting a first convex portion group for expressing a latent image, and fig. 7f is a diagram showing the structure of a convex portion 414 constituting a second convex portion group.
As shown in fig. 7a to 7f, a forgery prevention sheet 401 of the present embodiment is configured by providing a forgery prevention structure 410 in a partial region of a sheet base material 402 made of paper. The sheet base material 402 has a planar portion 403 to be a base material surface, an information printing region 404 is provided in a partial region of the planar portion 403, and a forgery prevention structure 410 is provided in another region. The forgery prevention sheet 401 configured as described above can be used as a ticket for a concert or the like, for example. In this case, the content of the concert, the name of the concert field, the number of seats, and the like are printed on the information printing area 404. In addition, before printing information on the information printing area 404 of the sheet base material 402, it is conceivable to print a predetermined pattern or color on the sheet base material 402 as a preprinting, but in this case, it is necessary to make a latent image formed by the forgery prevention structure 410 invisible.
As shown in fig. 7b, in the forgery prevention structure 410 provided on the sheet base material 402, a display portion is configured by providing a plurality of mark portions 411, which are second color components made of black different from the background color region 412, in a matrix shape on the background color region 412, which is a first color component made of white same as the base color of the planar portion 403 of the sheet base material 402. In the area where the plurality of mark portions 411 are arranged in a matrix, a plurality of protrusions 413 which are embossed portions constituting the first protrusion group and a plurality of protrusions 414 which are embossed portions constituting the second protrusion group are formed. As shown in fig. 7c to 7f, the projections 413 and 414 have a shape in which the apex portion is removed from the cone, protrude from the surface of the sheet base material 402 by about 0.05 to 0.1mm in the normal direction of the planar portion 403, and have a circular shape having a diameter of 0.5mm or less at the boundary with the planar portion 403. The cross-sectional area gradually decreases as the distance from the boundary portion increases, and the opposite side of the boundary portion becomes the top portions 413b and 414b parallel to the flat surface portion 403. The plurality of convex portions 413 constituting the first convex portion group are formed in a predetermined region of the background color region 412 in a row or a column parallel to the arrangement direction of the plurality of mark portions 411 so as to express a latent image "T" by the shape of the first convex portion group, and are formed between the plurality of mark portions 411 arranged in a matrix. Thus, as shown in fig. 7e, parts of the four marker portions 411 are respectively overlaid on the side surfaces 413a, and the white of the background color region 412 of the portion surrounded by the four marker portions 411 is represented on the top 413 b. The plurality of convex portions 414 constituting the second convex portion group are formed in a row or a column parallel to the arrangement direction of the plurality of convex portions 413 so that the region where the plurality of convex portions 413 constituting the first convex portion group are formed is surrounded by the background color region 412, and are formed on the mark portions 411 provided in the region other than the predetermined region among the plurality of mark portions 411 provided in a matrix form. Thus, as shown in fig. 7f, the top 414b and the side 414a include the mark 411. In this embodiment, for convenience of explanation, the forgery prevention structure 410 is illustrated as a structure in which 100 mark portions 411 are formed in a matrix of 10 × 10, and the larger the number of mark portions, the finer the characters of the latent image that can be visualized by the forgery prevention structure 410, and the easier the expression of curves and the like.
A method for manufacturing the forgery-preventing sheet 401 configured as described above will be described below.
First, 100 mark portions 411 are printed in black in a 10 × 10 matrix in the region of the sheet base material 402 where the forgery prevention structure 410 is provided, that is, in the region of the white background color region 412. The mark 411 may be printed simultaneously with the preprinting or after the preprinting.
Next, in the region where the mark portion 411 is printed, the convex portions 413 constituting the first convex portion group and the convex portions 414 constituting the second convex portion group are formed using an embossing plate. The convex portions 413 are formed between the plurality of mark portions 411 arranged in a matrix in a predetermined region where the mark portions 411 are printed, and the convex portions 414 are formed on the mark portions 411 arranged in a region other than the predetermined region among the plurality of mark portions 411 arranged in a matrix.
The forgery prevention sheet 401 is manufactured as described above, and then information corresponding to the use purpose is printed on the information printing area 404 of the sheet base material 402 and used.
The operation of the forgery prevention sheet 401 will be described below.
First, the operation of the forgery prevention sheet 401 shown in fig. 7a to 7f when viewed from the front, that is, the normal direction of the planar portion 403 of the sheet base material 402 will be described.
Fig. 8 is a diagram for explaining the operation when the forgery prevention sheet 401 shown in fig. 7a to 7f is viewed from the front, and shows the view of the forgery prevention structure 410.
When the forgery prevention sheet 401 shown in fig. 7a to 7f is viewed from the front, that is, the normal direction of the planar portion 403, as shown in fig. 8, in the forgery prevention structure 410, the background color region 412 is white, whereas the plurality of mark portions 411 provided in a matrix shape on the background color region 412 are black, and therefore the plurality of mark portions 411 in a matrix shape are recognized. At this time, although the sheet base material 402 is formed with the plurality of convex portions 413 and 414 protruding from the planar portion 403, when the forgery prevention sheet 401 is viewed from the front, since the convex portions 413 and 414 are viewed in the protruding direction, the mark portions 411 are not blocked from the viewing direction and all the mark portions 411 provided in a matrix form can be visually recognized, and the convex portions 413 and 414 are hardly recognized and a latent image "T" is not shown.
Next, an operation when the viewing direction of the forgery-prevention sheet 401 shown in fig. 7a to 7f is changed from the front side, that is, the normal direction of the plane portion 403 of the sheet base material 402 will be described.
Fig. 9a is a view of the convex portions 413 constituting the first convex portion group as viewed from the side direction when the direction of observation of the forgery-prevention sheet 401 shown in fig. 7a to 7f is changed from the front, fig. 9b is a view of the convex portions 14 constituting the second convex portion group as viewed from the side direction when the direction of observation of the forgery-prevention sheet 401 shown in fig. 7a to 7f is changed from the front, and fig. 9c to 9f are views showing the forgery-prevention structure 410 of the forgery-prevention sheet 401 shown in fig. 7a to 7 f.
When the viewing direction of the forgery-prevention sheet 401 shown in fig. 7a to 7f is changed from the front, the angle with respect to the viewing direction of the plane portion 403 of the sheet base material 402 is an acute angle. As described above, as shown in fig. 9a and 9b, side surfaces 413a and 414a of the plurality of projections 413 and 414 projecting from the planar portion 403 are hidden from view by the projections 413 and 414 adjacent to the observation direction side of the projections 413 and 414, and only the top portions 413b and 414b are visible.
Here, among the plurality of convex portions 413 and 414, in the convex portion 413 constituting the first convex portion group expressing the latent image, as shown in fig. 7e, white of the background color region 412 is expressed on the top 413b, and in the convex portion 414 constituting the second convex portion group, as shown in fig. 7f, the mark portion 411 of black different from the background color region 412 is expressed on the top 414 b.
Therefore, when the viewing direction of the forgery prevention sheet 401 is changed to, for example, the lower side in fig. 7a, the side surfaces 413a and 414a of the plurality of convex portions 413 and 414 are hidden from view by the convex portions 413 and 414 adjacent to the viewing direction sides of the convex portions 413 and 414, and only the top portions 413b and 414b are visible, in this case, the top portions 413b and 414b of the convex portions 413 and 414 are different in color from each other, and as shown in fig. 9c, a latent image "T" formed by the shape of the first convex portion group formed by the plurality of convex portions 413 appears in white and is visible.
In the forgery prevention sheet 401 shown in fig. 7a to 7f, a plurality of mark portions 411 are provided in a matrix form in a background color region 412, a first protrusion group composed of a plurality of protrusions 413 is formed in a predetermined region of the background color region 412, the plurality of protrusions 413 forms a latent image "T" by being arranged in parallel with the arrangement direction of the plurality of mark portions 411 and forming a line or a column, a second protrusion group composed of a plurality of protrusions 414 is formed in a region of the background color region 412 surrounding the predetermined region, and the plurality of protrusions 414 forms a latent image "T" by being arranged in parallel with the arrangement direction of the plurality of protrusions 413 forming the first protrusion group and forming a line or a column. Therefore, the plurality of convex portions 413 constituting the first convex portion group and the plurality of convex portions 414 constituting the second convex portion group are formed in a substantially matrix shape including rows and columns, and when viewed in any direction forming an acute angle with respect to the planar portion 403, the side surfaces 413a and 414a of the plurality of convex portions 413 and 414 are hidden and invisible by the convex portions 413 and 414 adjacent to the side in the viewing direction of the convex portions 413 and 414, and only the top portions 413b and 414b are visible, and the color of the top portion 413b of the plurality of convex portions 413 constituting the first convex portion group is different from the color of the top portion 414b of the plurality of convex portions 414 constituting the second convex portion group, so that the latent image "T" formed by the first convex portion group appears in white and is visible. For example, when the direction of observation of the forgery prevention sheet 401 is changed to the upper side in fig. 7a, a latent image "T" formed by the shape of the first convex portion group formed by the plurality of convex portions 413 appears as shown in fig. 9d and can be seen, when the direction of observation of the forgery prevention sheet 401 is changed to the right side in fig. 7a, a latent image "T" formed by the shape of the first convex portion group formed by the plurality of convex portions 413 appears as shown in fig. 9e and can be seen, and when the direction of observation of the forgery prevention sheet 401 is changed to the left side in fig. 7a, a latent image "T" formed by the shape of the first convex portion group formed by the plurality of convex portions 413 appears as shown in fig. 9f and can be seen.
In addition, although the side surface 414a of the convex portion 414 constituting the most anterior row in the observation direction among the plurality of convex portions 414 constituting the second convex portion group is visually recognizable when viewed from any of the above directions, the mark portion 411 may be recognized regardless of the latent image, for example, because the number of convex portions 413 and 414 is large, or the line width of the latent image constituted by the convex portion 413 is larger than the line width of the mark portion 411 expressed on the side surface 414a of the convex portion 414 constituting the most anterior row in the observation direction. When the latent image is not conspicuous due to the mark portions 411 appearing on the side surfaces 414a of the convex portions 414 constituting the columns closest to each other in the observation direction, the convex portions 413 constituting the latent image may be provided between the mark portions 411 apart from the periphery among the plurality of mark portions 411 formed in a matrix shape, or the like.
When the above-described forgery prevention sheet 401 is copied, the information printed on the information printing area 404 of the sheet base material 402 or the mark portions 411 provided in a matrix shape on the sheet base material 402 by printing is copied, but the convex portions 413 and 414 cannot be reproduced. Therefore, even when the viewing direction of the copy is changed, the latent image formed by the first convex portion group including the plurality of convex portions 413 does not appear, and thus the authenticity can be determined. In this way, in the forgery-preventing sheet 401 of the present embodiment, even when the observation direction of the forgery-preventing sheet 401 is changed in any direction from the normal direction of the flat surface portion 403 of the sheet base material 402, the latent image formed by the first convex portion group including the plurality of convex portions 413 appears and is visible, and therefore, the authenticity of the latent image can be easily determined without being limited by the observation direction.
(sixth embodiment)
Fig. 10a is a diagram showing the entire structure of a forgery prevention sheet according to a sixth embodiment of a forgery prevention medium of the present invention, fig. 10B is a diagram showing the detailed structure of the forgery prevention structure 510 shown in fig. 10a, fig. 10c is a sectional view a-a 'shown in fig. 10B, fig. 10d is a sectional view B-B' shown in fig. 10B, fig. 10e is a diagram showing the structure of a convex portion 513 constituting a first convex portion group for expressing a latent image, and fig. 10f is a diagram showing the structure of a convex portion 514 constituting a second convex portion group.
As shown in fig. 10a to 10f, this embodiment is different from the embodiment shown in fig. 7a to 7f only in that a background color region 512 is provided in black in a region to be a forgery prevention structure 510 of the sheet base material 502, and white mark portions 511 are provided in a matrix in the background color region 512. That is, the color of the background color region 512 is reversed from the color of the marker 511, compared to the mode shown in fig. 7a to 7 f.
In the forgery prevention sheet 501 configured as described above, when viewed from the front, only the mark portions 511 provided in a matrix on the black background color region 512 can be recognized in white, and the latent image "T" cannot be recognized. When the viewing direction of the forgery-preventing sheet 501 is changed from the front, the side surfaces 513a and 514a of the plurality of convex portions 513 and 514 projecting from the flat surface portion 503 are hidden from view by the convex portions 513 and 514 adjacent to the viewing direction sides of the convex portions 513 and 514, and only the top portions 513b and 514b are visible, and the latent image "T" formed by the shape of the first convex portion group formed by the plurality of convex portions 513 appears in black and is visible due to the difference in color between the top portion 513b of the convex portion 513 and the top portion 514b of the convex portion 514.
(seventh embodiment)
Fig. 11a is a diagram showing the entire structure of a forgery prevention sheet according to a seventh embodiment of a forgery prevention medium of the present invention, fig. 11B is a diagram showing the detailed structure of the forgery prevention structure 610 shown in fig. 11a, fig. 11c is a sectional view a-a 'shown in fig. 11B, fig. 11d is a sectional view B-B' shown in fig. 11B, fig. 11e is a diagram showing the structure of a convex portion 613 constituting a first convex portion group for expressing a latent image, and fig. 11f is a diagram showing the structure of a convex portion 614 constituting a second convex portion group.
As shown in fig. 11a to 11f, this embodiment is different from the embodiment shown in fig. 7a to 7f only in that the size of the mark parts 611 provided in a matrix on the sheet base material 602 is smaller than the top part 614b of the projection 614.
In the forgery prevention sheet 601 configured as described above, the mark parts 611 provided in a matrix on the white background color region 612 can be recognized only in black when viewed from the front, and the latent image "T" cannot be recognized. When the viewing direction of the forgery prevention sheet 601 is changed from the front, the side surfaces 613a and 614a of the plurality of protrusions 613 and 614 protruding from the plane portion 603 are hidden from view by the protrusions 613 and 614 adjacent to the viewing direction side of the protrusions 613 and 614, and only the tops 613b and 614b are visible, and the latent image "T" formed by the shape of the first protrusion group formed by the plurality of protrusions 613 appears in white due to the difference in color between the top 613b of the protrusion 613 and the top 614b of the protrusion 614.
(eighth embodiment)
Fig. 12a is a diagram showing the entire structure of a forgery prevention sheet of an eighth embodiment of a forgery prevention medium of the present invention, fig. 12B is a diagram showing the detailed structure of a forgery prevention structure 710 shown in fig. 12a, fig. 12c is a sectional view a-a 'shown in fig. 12B, fig. 12d is a sectional view B-B' shown in fig. 12B, fig. 12e is a diagram showing the structure of a convex portion 713 constituting a first convex portion group for expressing a latent image, and fig. 12f is a diagram showing the structure of a convex portion 714 constituting a second convex portion group.
As shown in fig. 12a to 12f, this embodiment is different from the embodiment shown in fig. 11a to 11f only in that a background color region 712 is provided in black in a region to be a forgery prevention structure 710 of the sheet base material 702, and white mark portions 711 are provided in a matrix in the background color region 712. That is, the color of the background color region 712 is inverted from the color of the marker 711 with respect to the mode shown in fig. 11a to 11 f.
In the forgery prevention sheet 701 configured as described above, when viewed from the front, the mark portions 711 provided in a matrix on the black background color region 712 can be recognized only in white, and the latent image "T" cannot be recognized. When the viewing direction of the forgery prevention sheet 701 is changed from the front, the side surfaces 713a and 714a of the plurality of convex portions 713 and 714 protruding from the flat surface portion 703 are hidden from view by the convex portions 713 and 714 adjacent to the viewing direction side of the convex portions 713 and 714, and only the top portions 713b and 714b are visible, and the latent image "T" formed by the shape of the first convex portion group formed by the plurality of convex portions 713 appears in black due to the difference in color between the top portion 713b of the convex portion 713 and the top portion 714b of the convex portion 714.
In addition, the convex portions of the fifth to eighth embodiments may have a cylindrical shape or a conical or hemispherical shape without a top portion. However, as described above, the shape having the top portion parallel to the flat surface portion can be in a state of being continuous with the color of the background color region, and the latent image can be clearly displayed. Further, a case where the cross section is rectangular is also considered. However, in the case shown in fig. 7a to 7f and fig. 10a to 10f, among the convex portions 413, 414, 513, and 514, at least the convex portions 413 and 513 constituting the first convex portion group expressing a latent image are set to have a substantially constant distance from the center so that the boundary portions with the flat portions 403 and 503 are circular, and thus the shapes of the top portions 413b and 513b which can be visually recognized from any direction are the same, and the fine shapes of the latent images expressed by the convex portions 413 and 513 can be made uniform. In addition, in the angle formation with respect to the flat surface portion, it is preferable that each of the convex portions is formed in a columnar shape such as a circular column so as to protrude in parallel with the normal direction of the flat surface portion in order to easily hide the side surface of the convex portion by the convex portion adjacent to the observation direction side.
In the fifth to eighth embodiments, the latent image "T" is expressed by the shape of the first convex portion group formed by the plurality of convex portions 413, 513, 613 and 713, but the latent image "T" may be expressed by the shape of the second convex portion group formed by the plurality of convex portions 414, 514, 614 and 714. In this case, when the viewing direction of the forgery prevention sheet 401, 501, 601, 701 is changed from the front, the latent image "T" appears in the color expressed in the top 414b, 514b, 614b, 714b of the plurality of convex portions 414, 514, 614, 714, that is, the color of the mark portion 411, 511, 611, 711.
In the fifth to eighth embodiments, it is conceivable that the marking portions 411, 511, 611, and 711 are divided in the circumferential direction and the colors of the divided regions are different from each other. In this case, the authenticity can be determined by changing the colors that are visually recognized according to the direction in which the forgery prevention structures 410, 510, 610, 710 are viewed.
In the eight embodiments, instead of the convex portions being the embossed portions, concave portions recessed from the flat surface portions may be provided and used as the embossed portions. That is, as the embossed portion of the present invention, any one of the convex portion and the concave portion formed on the flat surface portion can be used.
(ninth embodiment)
Fig. 13a is a diagram showing the overall structure of a forgery prevention sheet of a ninth embodiment of a forgery prevention medium of the present invention, fig. 13b is a diagram showing the detailed structure of the forgery prevention structure 810 shown in fig. 13a, fig. 13c is a sectional view a-a' shown in fig. 13b, fig. 13d is a diagram showing the structure of a convex portion 811 provided with an inner mark 813 shown in fig. 13b, and fig. 13e is a diagram showing the structure of a convex portion 811 not provided with an inner mark 813 shown in fig. 13 b.
As shown in fig. 13a to 13e, a forgery prevention structure 810 is provided in a local region of a sheet base material 802 made of paper to constitute a forgery prevention sheet 801 of the present embodiment. The sheet base material 802 has a planar portion 803, and an information printing region 804 is provided in a partial region of the planar portion 803, and a forgery prevention structure 810 is provided in another region. The forgery prevention sheet 801 configured as described above can be used as a ticket for a concert, for example. In this case, the content of the concert, the name of the concert field, the number of seats, and the like are printed on the information printing area 804. Further, before printing information on the information printing area 804 of the sheet base material 802, it is also conceivable to print a predetermined pattern or color on the sheet base material 802 as a preprinting, but in this case, it is necessary to make the latent image of the forgery prevention structure 810 invisible.
As shown in fig. 13b, the forgery prevention structure 810 provided on the sheet base material 802 includes: a plurality of projections 811 which are embossed portions formed in a matrix on the sheet base material 802; a plurality of outer circumferential marks 812 that are first mark portions provided around the plurality of convex portions 811, respectively; of the plurality of convex portions 811, only the inner mark 813, which is the second mark portion provided on the predetermined convex portion 811, is provided. As shown in fig. 13c, the convex portion 811 has a shape in which the apex portion is removed from the cone, and protrudes by about 0.1mm in the normal direction of the planar portion 803 of the sheet base material 802, and the boundary portion with the planar portion 803 has a circular shape with a diameter of 0.5mm or less. As the cross-sectional area gradually decreases away from the boundary portion, the opposite side of the boundary portion becomes a top portion 811b parallel to the planar portion 803 as shown in fig. 13d and 13 e. Therefore, the side surface 811a of the convex portion 811 is oriented in a direction inclined with respect to the normal line of the flat surface portion 803. The outer peripheral marks 812 are provided on the planar portion 803 of the sheet base material 802 by printing so as to surround the convex portions 811, respectively, and since the boundary portion between the convex portions 811 and the planar portion 803 is circular, the outer peripheral marks 812 have a circular shape. The inner mark 813 is provided by printing on the entire circumference of the side surface 811a of the convex portion 811 predetermined among the plurality of convex portions 811, and the boundary portion between the convex portion 811 and the flat surface portion 803 is circular, and the cross-sectional area of the convex portion 811 gradually decreases as it goes away from the boundary portion, so that the inner mark has a circular shape when viewed from the normal direction of the flat surface portion 803 of the sheet base material 802. In this embodiment, for convenience of explanation, the forgery prevention structure 810 shown in the figure is a structure in which 10 convex portions 811 and a peripheral mark 812 are used in each of the vertical and horizontal directions, and as the number of the convex portions is increased, characters of a latent image that can be visualized by the forgery prevention structure 810 become finer, and a curve or the like is more easily expressed.
A method of manufacturing the forgery prevention sheet 801 configured as described above will be described below.
Fig. 14a and 14b are views for explaining a method of manufacturing the forgery-prevention sheet 801 shown in fig. 13a to 13e, and show only a region where the forgery-prevention structure 810 is provided in the sheet base material 802.
First, as shown in fig. 14a, the outer circumferential marks 812 and the inner marks 813 are printed in a circular shape on the region of the sheet base material 802 where the forgery prevention structure 810 is provided. The outer peripheral marks 812 are printed in a 10 × 10 matrix, and the inner marks 813 are printed along the outer peripheral marks 812 within the outer peripheral marks 812 at positions where "T" is formed among the 100 outer peripheral marks 812. The combination of the outer circumferential mark 812 and the inner mark 813 is set in advance as print data based on a latent image (in this embodiment, "T") appearing through the forgery prevention structure 810. The outer circumferential mark 812 and the inner mark 813 may be printed simultaneously with the preprinting or after the preprinting.
Next, as shown in fig. 14b, a plurality of convex portions 811 are formed on the area where the outer circumferential mark 812 and the inner mark 813 are printed, using an embossing plate. The convex portions 811 are formed inside the 100 outer circumferential marks 812, respectively, and the outer side of the inner mark 813 is a boundary portion with the flat surface portion 803 at a portion where the inner mark 813 is provided, whereby the outer circumferential marks 812 surround the convex portions 811, and the inner mark 813 is provided over the entire circumference of the side surface of the convex portions 811.
After the forgery-preventing sheet 801 is manufactured as described above, information corresponding to the application is printed on the information printing region 804 of the sheet base material 802 and used.
The operation of the forgery prevention sheet 801 will be described below.
First, the operation of the forgery prevention sheet 801 shown in fig. 13a to 13e when viewed from the front, that is, the normal direction of the planar portion 803 of the sheet base material 802 will be described.
Fig. 15a is a view showing reflection of light of the forgery prevention structure 810 when the forgery prevention sheet 801 shown in fig. 13a to 13e is viewed from the front, fig. 15b is a view showing a view of the outer peripheral mark 812 and the inner mark 813 of the reflection of light shown in fig. 15a, and fig. 15c is a view showing a view of the outer peripheral mark 812 and the inner mark 813 of the forgery prevention structure 810 when the forgery prevention sheet 801 shown in fig. 13a to 13e is viewed from the front.
When the forgery prevention sheet 801 shown in fig. 13a to 13e is viewed from the front, the planar portion 803 faces the observation direction in the sheet base material 802, and therefore, light from the observation direction is reflected in the observation direction in a region which becomes the planar portion 803, and the amount of light received in the observation direction of the reflected light increases. In the outer peripheral mark 812 and the inner mark 813 provided in the forgery prevention structure 810, since the outer peripheral mark 812 is provided in the region to be the flat surface portion 803 of the sheet base material 802, light from the observation direction is reflected in the observation direction on the outer peripheral mark 812 as shown by a chain line in fig. 15a, and thereby the outer peripheral mark 812 can be clearly seen as shown in fig. 15 b.
On the other hand, when the forgery prevention sheet 801 is viewed from the front side on the side surface 811a of the convex portion 811 formed on the sheet base material 802, light from the observation direction is also reflected in a direction other than the observation direction, and the amount of light received in the observation direction of the reflected light is reduced. In the outer circumferential mark 812 and the inner mark 813 provided in the forgery prevention structure 810, since the inner mark 813 is provided on the side surface 811a of the convex portion 811, light from the observation direction is reflected and dispersed in the inner mark 813 in the other directions than the observation direction as shown by the broken line in fig. 15a, and thus the inner mark 813 is in a state of being weakly visible as shown in fig. 15 b.
Therefore, when the forgery prevention sheet 801 is viewed from the front, as shown in fig. 15c, only the outer circumferential mark 812 provided around the convex portion 811 where the inner mark 813 is not provided is visible among the plurality of convex portions 811, and only the inner mark 813 is weakly visible among the convex portions 811 where the inner mark 813 is provided on the side surface 811a among the plurality of convex portions 811, whereas the outer circumferential mark 812 is clearly visible, and thus the outer circumferential mark 812 is almost visible.
Next, an operation when the viewing direction of the forgery-prevention sheet 801 shown in fig. 13a to 13e is changed from the front side, that is, the normal direction of the plane portion 803 of the sheet base material 802 will be described.
Fig. 16a is a view showing reflection of light of the forgery prevention structure 810 when the direction of observation of the forgery prevention sheet 801 shown in fig. 13a to 13e is changed from the front, fig. 16b is a view showing reflection of light of the outer circumferential mark 812 and the inner mark 813 shown in fig. 16a, and fig. 16c to 16f are views showing the outer circumferential mark 812 and the inner mark 813 of the forgery prevention structure 810 when the direction of observation of the forgery prevention sheet 801 shown in fig. 13a to 13e is changed from the front.
When the viewing direction of the forgery-prevention sheet 801 shown in fig. 13a to 13e is changed from the front, the viewing direction is close to the direction facing the side surface 811a of the convex portion 811 formed on the sheet base material 802. Thus, the side surfaces 811a of the convex portions 811 reflect light from the observation direction as it is in the observation direction, and the amount of light received in the observation direction of the reflected light increases. In the outer circumferential mark 812 and the inner mark 813 provided in the forgery prevention structure 810, since the inner mark 813 is provided on the side surface 811a of the convex portion 811 formed on the sheet base material 802, light from the observation direction is reflected in the observation direction on the inner mark 813 as shown by a chain line in fig. 16a, and thereby the inner mark 813 can be clearly seen as shown in fig. 16 b.
On the other hand, since the planar portion 803 of the sheet base material 802 does not face the observation direction, light from the observation direction is also reflected in a direction other than the observation direction, and the amount of light received in the observation direction of the reflected light is reduced. In the outer peripheral mark 812 and the inner mark 813 provided in the forgery prevention structure 810, since the outer peripheral mark 812 is provided on the flat surface portion 803 of the sheet base material 802, light from the observation direction is reflected and dispersed on the outer peripheral mark 812 in the other direction than the observation direction as shown by the broken line in fig. 16a, and thus the outer peripheral mark 812 is in a state of being only weakly visible as shown in fig. 16 b.
Therefore, when the viewing direction of the forgery prevention sheet 801 is changed to the lower side in fig. 13a, for example, as shown in fig. 16c, a latent image "T" formed by the inner mark 813 provided on the forgery prevention structure 810 appears and can be seen. In this case, when the convex portions 811 are formed close to each other or the viewing direction of the forgery prevention sheet 801 is largely changed from the normal direction of the sheet base material 802, the outer circumferential marks 812 provided on the flat surface portions 803 are hidden from view by the convex portions 811 adjacent to the viewing direction side of the convex portions 811 surrounded by the outer circumferential marks 812, and the latent image formed by the inner marks 813 is easily visually recognized.
Here, in the forgery prevention sheet 801 shown in fig. 13a to 13e, since the inner mark 813 constituting a latent image appearing in accordance with the observation direction is provided over the entire circumference of the side surface 811a of the convex portion 811 formed on the sheet base material 802, the latent image formed by the inner mark 813 appears and is visible regardless of the change in the observation direction from the normal direction of the plane portion 803 of the sheet base material 802. For example, when the direction of observation of the forgery prevention sheet 801 is changed to the upper side in fig. 13a, the latent image "T" formed by the inner mark 813 appears as shown in fig. 16d and is visible, when the direction of observation of the forgery prevention sheet 801 is changed to the right side in fig. 13a, the latent image "T" formed by the inner mark 813 appears as shown in fig. 16e and is visible, and when the direction of observation of the forgery prevention sheet 801 is changed to the left side in fig. 13a, the latent image "T" formed by the inner mark 813 appears as shown in fig. 16f and is visible.
When the above-described forgery prevention sheet 801 is copied, the information printed on the information printing area 804 of the sheet base material 802 or the outer circumferential mark 812 and the inner mark 813 provided on the sheet base material 802 by printing are copied, but the convex portion 811 cannot be reproduced. Therefore, even when the viewing direction of the copy is changed, the latent image of the inner mark 813 does not appear, and thus the authenticity can be determined. In this way, in the forgery-preventing sheet 801 of the present embodiment, even when the observation direction of the forgery-preventing sheet 801 is changed in any direction from the normal direction of the flat surface portion 803 of the sheet base material 802, the latent image formed by the inner mark 813 appears and is visible, and therefore, the forgery-preventing sheet 801 can be easily judged whether or not the latent image is true or false without being limited by the observation direction.
The outer circumferential mark 812 and the inner mark 813 provided in the forgery prevention structure 810 may have a shape that partially protrudes in the width direction, instead of the uniform width as in the present embodiment. In the inner mark 813, the inner side of the inner mark 813 shown in the figure may be colored entirely. However, in this case, when the forgery prevention sheet 801 is viewed from the front, the inner mark 813 is difficult to be visually recognized, and therefore the convex portion 811 needs to be formed at a steep angle with respect to the flat surface portion 803.
In addition, in the convex portion 811, a conical or hemispherical shape without the top portion 811b is also considered. In addition, in the hemispherical shape, a region of the convex portion which is not substantially parallel to the planar portion 803 is formed as a side surface, and the inner mark 813 is provided in this region.
Further, the inner mark 813 constituting a latent image is less visible when the forgery prevention sheet 801 is viewed from the front as the formation angle of the convex portion 811 with respect to the flat surface portion 803 is closer to 90 degrees, but conversely, when the viewing direction is inclined from the normal direction of the flat surface portion 803, the inner mark 813 forming a latent image is hidden by the convex portion 811 adjacent to the viewing direction side before the viewing direction faces the side surface 811a of the convex portion 811, and the above-described effect cannot be obtained, and therefore, it is preferable to appropriately set the angle in consideration of the line width of the inner mark 813, the reflectance of the sheet base material 802, and the like.
In this embodiment, the convex portion 811 is formed as the embossed portion on the flat surface portion 803, and the inner mark 813 is provided on the side surface 811a of the convex portion 811, but a concave portion recessed from the flat surface portion 803 may be provided as the embossed portion on the flat surface portion 803, and the inner mark 813 may be provided on the inner side surface of the concave portion. That is, as the embossed portion of the present invention, any of the convex portion and the concave portion formed on the flat surface portion 803 can be used.
In this embodiment, it is also conceivable that the inner marks 813 are divided in the circumferential direction so that the colors of the plurality of divided regions are different from each other. In this case, the authenticity can be determined by changing the color visually recognized according to the direction in which the forgery prevention structure 810 is viewed.
(tenth embodiment)
Fig. 17a is a diagram showing the entire structure of a forgery prevention sheet according to a tenth embodiment of a forgery prevention medium of the present invention, fig. 17b is a diagram showing the detailed structure of a forgery prevention structure 910 shown in fig. 17a, fig. 17c is a sectional view a-a' shown in fig. 17b, fig. 17d is a diagram showing the structure of a convex portion 911 provided with a character portion mark 912 shown in fig. 17b, and fig. 17e is a diagram showing the structure of a convex portion 911 provided with a background portion mark 913 shown in fig. 17 b.
As shown in fig. 17a to 17e, a forgery prevention sheet 901 of the present embodiment is formed by providing a forgery prevention structure 910 in a local region of a sheet base material 902 made of paper. The sheet base material 902 has a planar portion 903 which becomes a base material surface, an information printing region 904 is provided in a partial region of the planar portion 903, and a forgery prevention structure 910 is provided in another region. The forgery prevention sheet 901 configured as described above is considered to be used as a ticket for a concert or the like, for example. In this case, the content of the concert, the name of the concert field, the number of seats, and the like are printed on the information printing area 904. Further, it is also conceivable that the sheet base material 902 is printed with a predetermined pattern or colored in a predetermined color as a preprinting before the information is printed on the information printing area 904 of the sheet base material 902, but in this case, it is necessary to make the latent image of the forgery prevention structure 910 invisible.
As shown in fig. 17b, the forgery prevention structure 910 provided on the sheet base material 902 includes: a plurality of protrusions 911 that are embossed portions formed in a matrix on the sheet base material 902;a character part mark 912 that is a first mark part provided only on a predetermined convex part 911 among the plurality of convex parts 911; the background portion mark 913, which is the second mark portion provided on the convex portion 911 not provided with the character portion mark 912 among the plurality of convex portions 911. As shown in fig. 17c, the convex portion 911 is a shape in which the apex portion is removed from the cone, and protrudes from the surface of the sheet base material 902 by about 0.1mm in the normal direction of the flat surface portion 903, and the boundary portion with the flat surface portion 903 is a circular shape having a diameter of 0.5mm or less. As the cross-sectional area gradually decreases away from the boundary portion, the opposite side of the boundary portion becomes a top portion 911b parallel to the planar portion 903 as shown in fig. 17d and 17 e. Therefore, the side surface 911a of the convex portion 911 is oriented in a direction inclined with respect to the normal line of the flat portion 903. The character portion mark 912 is printed on the predetermined side surface 911a of the convex portion 911 among the plurality of convex portions 911, and has a first height h from the flat surface portion 9031The position of (a) is set over the entire circumference, the boundary between the convex portion 911 and the flat surface portion 903 is formed in a circular shape, and the cross-sectional area of the convex portion 911 gradually decreases as it goes away from the boundary, so that the convex portion is formed in a circular shape when viewed from the normal direction of the flat surface portion 903 of the sheet base material 902. The background portion mark 913 is printed such that the height of the side face 911a of the convex portion 911, on which the character portion mark 912 is not provided, from the flat surface portion 903 is the second height h2The convex portion 911 and the flat portion 903 are arranged over the entire circumference, and the cross-sectional area of the convex portion 911 gradually decreases as the distance from the boundary portion, and thus the convex portion 911 becomes circular when viewed from the normal direction of the flat portion 903 of the sheet base material 902. Here, the height h of the character portion mark 912 provided on the side face 911a of the convex portion 911 is set1And a height h provided with background portion marks 9132In the height h of background part mark 9132Lower than the height h provided with the character part mark 9121. In this embodiment, for convenience of explanation, the forgery prevention structure 910 is illustrated as a structure in which 10 convex portions 911 are formed in each of the vertical and horizontal directions, and as the number of the convex portions increases, the characters of the latent image that can be visualized by the forgery prevention structure 910 become finer, and the curve or the like becomes easier to express.
A method for manufacturing the forgery-preventing sheet 901 configured as described above will be described below.
Fig. 18a and 18b are views for explaining a method of manufacturing the forgery-prevention sheet 901 shown in fig. 17a to 17e, and only the region where the forgery-prevention structure 910 is provided in the sheet base material 902 is shown.
First, as shown in fig. 18a, a character portion mark 912 and a background portion mark 913 are printed in a circular shape on the region of the sheet base material 902 where the forgery prevention structure 910 is provided, respectively. The character part mark 912 is printed at the position where the latent image "T" is formed in the 10 × 10 matrix region where the convex parts 911 are provided, and the background part mark 913 is printed at the position where the character part mark 912 is not printed in the 10 × 10 matrix region. The character part marks 912 and the background part marks 913 are similar in shape to each other, and as for their diameters, as described above, the diameter of the character part marks 912 is smaller than the diameter of the background part marks 913 so that the height of the background part marks 913 from the plane part 903 is lower than the height of the character part marks 912 from the plane part 903 when the convex parts 911 are formed on the region where the character part marks 912 and the background part marks 913 are provided. The combination of the character part mark 912 and the background part mark 913 is set in advance as print data based on a latent image (T in this embodiment) appearing on the forgery prevention structure 910. The character part marks 912 and the background part marks 913 may be printed simultaneously with the preprinting or after the preprinting.
Next, as shown in fig. 18b, a plurality of convex portions 911 are formed on the region where the character portion mark 912 is printed and the region where the background portion mark 913 is printed, respectively, using an embossing plate. At this time, the convex portion 911 is formed such that the character portion marks 912 and the background portion marks 913 are located at the outer sides of the character portion marks 912 and the background portion marks 913, respectively, at the boundary portions with the planar portion 903, and thus the character portion marks 912 and the background portion marks 913 are located over the entire circumference of the side face 911a of the convex portion 911.
The forgery prevention sheet 901 is manufactured as described above, and then information corresponding to the use purpose is printed on the information printing region 904 of the sheet base material 902 and used.
The operation of the forgery prevention sheet 901 will be described below.
First, the operation of the forgery prevention sheet 901 shown in fig. 17a to 17e when viewed from the front surface, that is, the normal direction of the planar portion 903 of the sheet base material 902 will be described.
Fig. 19a is a view in a cross-sectional direction for explaining the operation when the forgery-preventing sheet 901 shown in fig. 17a to 17e is viewed from the front, and fig. 19b is a view showing the appearance of the character portion marks 912 and the background portion marks 913 of the forgery-preventing structure 910 when the forgery-preventing sheet 901 shown in fig. 17a to 17e is viewed from the front.
As shown in fig. 19a, when the forgery prevention sheet 901 shown in fig. 17a to 17e is viewed from the normal direction of the planar portion 903 which is the front surface, the character portion marks 912 and the background portion marks 913 provided on the plurality of convex portions 911, respectively, are not hidden from the viewing direction, and therefore, as shown in fig. 19b, all the character portion marks 912 and the background portion marks 913 can be visually recognized.
The character part mark 912 and the background part mark 913 are provided at different heights from the plane portion 903 in the side face 911a of the convex portion 911, but have similar shapes to each other, and are recognized as marks in which the same shape is formed in parallel as the character part mark 912 and the background part mark 913 are recognized as being substantially the same shape when the forgery prevention sheet 901 is viewed from the front side. The finer the projections 911 are, the more easily they can be recognized as being substantially the same shape.
Next, an operation when the viewing direction of the forgery-preventing sheet 901 shown in fig. 17a to 17e is changed from the front side, that is, the normal direction of the plane portion 903 of the sheet base material 902 will be described.
Fig. 20a is a view, viewed in a cross-sectional direction, illustrating an action when the viewing direction of the forgery-prevention sheet 901 shown in fig. 17a to 17e is changed from the front, and fig. 20b is a view illustrating the planar portion 9 when the background portion label 913 is not seen when the viewing direction of the forgery-prevention sheet 901 shown in fig. 17a to 17e is changed from the front03 angle of observation theta1And FIG. 20c is a view showing an angle θ shown in FIG. 20b1Fig. 20d to 20g are views showing the state of the character part mark 912, and fig. 17a to 17e show the character part mark 912 and the background part mark 913 of the forgery prevention structure 910 when the observation direction of the forgery prevention sheet 901 shown in fig. 17a to 17e is changed from the front.
When the viewing direction of the forgery-prevention sheet 901 shown in fig. 17a to 17e is changed from the front, the angle formed with respect to the viewing direction of the planar portion 903 of the sheet base material 902 becomes an acute angle. As shown in fig. 20b, the angle formed in the direction of observation of the planar portion 903 of the sheet base material 902 is smaller than the angle θ1In the meantime, of the character part mark 912 and the background part mark 913 provided on the side face 911a of the convex part 911, the background part mark 913 is hidden from view by the convex part 911 adjacent to the side of the observation direction of the convex part 911 provided with the background part mark 913. Further, as shown in fig. 20b, the distance in the direction parallel to the planar portion 903 between the background portion mark 913 and the end of the top portion 911b of the convex portion 911 adjacent to the observation direction side of the convex portion 911 provided with the background portion mark 913 is w1The difference in height between the background portion 913 and the convex portion 911 with respect to the planar portion 903 is t1At this time, the background portion mark 913 is hidden by the convex portion 911 and cannot be seen at the angle θ1By an angle theta1＝tan-1(t1/w1) And (4) showing.
On the other hand, in the character portion marks 912, the angle θ at which the background portion mark 913 is not visible is an angle formed in the direction of observation with respect to the plane portion 903 of the sheet base material 9021In the case of (3), as shown in fig. 20c, the convex portion 911 adjacent to the convex portion 911 provided with the character portion mark 912 in the observation direction is not hidden.
Therefore, the viewing direction of the forgery-prevention sheet 901 is changed to, for example, the lower side in fig. 17a, and the angle formed in the viewing direction of the plane portion 903 of the sheet base material 902 is made smaller than θ1In the case of the convex portion 911, only the character portion marks 912 and the components thereof are visible from the character portion marks 912 and the background portion marks 913 provided on the side face 911a of the convex portion 911As shown in fig. 20d, a latent image "T" formed of the character portion marks 912 appears and is visible by a background portion mark 913 provided on a side face 911a of the convex portion 911 in the row closest to the observation direction.
Here, in the forgery prevention sheet 901 shown in fig. 17a to 17e, since the character part marks 912 constituting the latent image appearing in accordance with the observation direction are provided over the entire circumference of the side face 911a of the convex part 911 formed on the sheet base material 902 and the plurality of convex parts 911 are formed in the matrix shape, when the angle formed by the planar part 903 of the sheet base material 902 and the observation direction is smaller than θ1In this case, the latent image formed by the character part mark 912 appears and is visible when viewed from any direction. For example, when the direction of observation of the forgery prevention sheet 901 is changed to the upper side in fig. 17a, the latent image "T" made up of the character part marks 912 appears and is visible as shown in fig. 20e, when the direction of observation of the forgery prevention sheet 901 is changed to the right side in fig. 17a, the latent image "T" made up of the character part marks 912 appears and is visible as shown in fig. 20f, and when the direction of observation of the forgery prevention sheet 901 is changed to the left side in fig. 17a, the latent image "T" made up of the character part marks 912 appears and is visible as shown in fig. 20 f.
In addition, although the background portion marks 913 provided on the side surface 911a of the convex portions 911 forming the row closest to the observation direction among the convex portions 911 formed in the matrix form are visible when viewed from any of the above directions, the background portion marks 913 may be recognized to be independent of the latent image by, for example, the number of convex portions 911 being large or the line width of the latent image formed by the character portion marks 912 being thicker than the line width of the background portion marks 913 as shown in fig. 20d to 20 g. When the latent image is not conspicuous due to the background portion marks 913 provided on the side face 911a of the convex portion 911 constituting the column closest to the observation direction, the character portion marks 912 constituting the latent image may be provided on the convex portion 911 apart from the periphery among the plurality of convex portions 911 formed in the matrix shape.
The angle formed by the plane 903 of the sheet base material 902 and the observation direction is less than theta1In this case, as described above, the side face 911a of the convex portion 911 is providedIn the character part marks 912 and the background part marks 913, the background part marks 913 are hidden from view, but the angle formed by the planar portion 903 of the sheet base material 902 and the observation direction is smaller, and as shown in fig. 20c, the angle formed by the observation direction of the planar portion 903 of the sheet base material 902 is smaller than the angle θ2In this case, the character part mark 912 provided on the side face 911a of the convex part 911 is hidden from view by the convex part 911 adjacent to the observation direction side of the convex part 911 provided with the character part mark 912. That is, the angle θ formed with respect to the observation direction of the planar portion 903 of the sheet base material 902 is θ2≤θ≤θ1In the case of the projection 911, only the character portion mark 912 is visible out of the character portion marks 912 and the background portion marks 913 provided on the side face 911a, and the latent image "T" appears and becomes visible. Further, as shown in fig. 20c, the distance in the direction parallel to the plane portion 903 between the character part mark 912 and the end of the top 911b of the convex portion 911 adjacent to the side of the observation direction of the convex portion 911 provided with the character part mark 912 is w2The difference in height between the character portion mark 912 and the convex portion 911 with respect to the flat surface portion 903 is t2At an angle θ at which the character part mark 912 is hidden from view by the convex part 9112By an angle theta2＝tan-1(t2/w2) And (4) showing.
When the above-described forgery prevention sheet 901 is copied, the information printed on the information printing area 904 of the sheet base material 902 or the character part mark 912 and the background part mark 913 provided on the sheet base material 902 by printing are copied, but the convex part 911 cannot be reproduced. Therefore, even when the viewing direction of the copied matter is changed, the latent image of the character part mark 912 is not displayed, and thus the authenticity can be determined. When the authenticity is determined in this manner, in the forgery-preventing sheet 901 of the present embodiment, even when the observation direction of the forgery-preventing sheet 901 is changed in any direction from the normal direction of the planar portion 903 of the sheet base material 902, the latent image of the character portion mark 912 appears and is visible, and therefore the authenticity determination of the latent image can be easily performed without being limited by the observation direction.
In this embodiment, the character portion marks 912, the background portion marks 913, and the outer circumference marks 914 provided in the forgery prevention structure 910 may not be uniform in width as in this embodiment, but may be partially protruded in the width direction. Further, the shape may be connected by a broken line.
The region provided with the character portion mark 912 may be a top 911b of the convex portion 911, not the side 911a of the convex portion 911. In this case, the height of the character part mark 912 with respect to the plane part 903 needs to be higher than the height of the projection part 911 on which the background part mark 913 is provided, and the shape needs to be similar to the background part mark 913.
In addition, in the convex portion 911, a conical or hemispherical shape having a cylindrical shape or having no top portion 911b is also considered. Further, a case where the cross section is rectangular is also considered. However, the distance from the center is made substantially constant so that the boundary portion between the concave portion 911 and the flat surface portion 903 is formed in a circular shape, and accordingly, the character portion mark 912 is also formed in a substantially constant so that the distance from the center is formed in a circular shape, and the shape of the character portion mark 912 that can be visually recognized is the same regardless of the direction, and thus the fine shape of the latent image appearing by the character portion mark 912 can be made uniform. However, in the angle formation with respect to the flat surface portion 903, it is preferable that each convex portion 911 is formed in a columnar shape such as a column so as to protrude in parallel with the normal direction of the flat surface portion 903 in order to facilitate the hiding of the background portion mark 913 provided on the side surface 911a of the convex portion 911 by the convex portion 911 adjacent to the observation direction side.
In the case of this embodiment, although the height of the character part mark 912 of the convex part 911 is higher than that of the background part mark 913, it is also conceivable to make the height of the background part mark 913 higher than that of the character part mark 912 and to make the latent image appear as an outline character.
In this embodiment, it is also conceivable that the character portion mark 912 is divided in the circumferential direction and the plurality of divided regions are different in color from each other. In this case, the authenticity can be determined by changing the color that can be visually recognized according to the direction in which the forgery prevention structure 910 is viewed.
In addition to the similar shape of a figure, the similar shape referred to in the present application is defined as a similar shape in which a part of a circumference is slightly broken, a part of a circumference is slightly distorted, the whole is slightly elliptical, or a shape close to a triangle or a quadrangle is slightly distorted, as compared with a circular shape.
(eleventh embodiment)
Fig. 21a is a diagram showing the entire structure of a forgery prevention sheet of an eleventh embodiment of a forgery prevention medium of the present invention, fig. 21b is a diagram showing the detailed structure of the forgery prevention structure 1010 shown in fig. 21a, fig. 21c is a sectional view a-a' shown in fig. 21b, fig. 21d is a diagram showing the structure of the convex portion 1011 constituting the first convex portion group shown in fig. 21b, and fig. 21e is a diagram showing the structure of the convex portion 1011 constituting the second convex portion group shown in fig. 21 b.
As shown in fig. 21a to 21e, a forgery prevention structure 1010 is provided in a local region of a sheet base material 1002 made of paper to constitute a forgery prevention sheet 1001 of the present embodiment. The sheet base material 1002 has a planar portion 1003, an information printing region 1004 is provided in a partial region of the planar portion 1003, and a forgery prevention structure 1010 is provided in another region. The forgery prevention sheet 1001 configured as described above is considered to be used as a ticket for a concert, for example. In this case, the content of the concert, the name of the concert field, the seat number, and the like are printed on the information printing area 1004. In addition, it is conceivable that a predetermined pattern or color is printed as a preprinting on the sheet base material 1002 before information is printed on the information printing area 1004 of the sheet base material 1002, but in this case, it is necessary to make the latent image of the forgery prevention structure 1010 invisible.
As shown in fig. 21b, a plurality of projections 1011 as embossed portions are formed in a matrix on a sheet base 1002, and marks 1012 and 1013 are printed so as to overlap the projections 1011, respectively, thereby forming a forgery prevention structure 1010 provided on the sheet base 1002. As shown in fig. 21c to 21e, the convex portion 1011 has a shape in which the apex portion is removed from the cone, and the sheet base 1002 is recessed by about 0.05 to 0.1mm from the side of the planar portion 1003 by an embossing plate or the like to form a side surface 1011a, and the same surface as the planar portion 1003 becomes a top portion 1011 b. The cross-sectional area gradually increases from the top 1011b toward the concave direction of the sheet base 1002, and the bottom of the convex 1011 has a circular shape with a diameter of 0.5mm or less.
The plurality of projections 1011 include: convex parts 1011 constituting a first convex part group of mark 1013 formed on side surface 1011 a; the side surface 1011a is formed with a convex portion 1011 constituting the second convex portion group of the mark 1012. The mark 1013 formed on the convex 1011 constituting the first convex group and the mark 1012 formed on the convex 1011 constituting the second convex group are formed over the entire circumference of the side 1011a of the convex 1011, and the line width of the mark 1013 is larger than the line width of the mark 1012. Thus, the convex portions 1011 forming the first convex portion group and the convex portions 1011 forming the second convex portion group have different color ratios in the side surface 1011a when viewed from the same direction. The convex portions 1011 forming the first convex portion group on which the marks 1013 are formed are arranged at positions where the latent image "T" is expressed among the plurality of convex portions 1011 formed in a matrix shape, and the other convex portions 1011 form the second convex portion group.
In this embodiment, for convenience of explanation, the forgery prevention structure 1010 is shown in which 100 convex parts 1011 are formed in a 10 × 10 matrix shape and the mark 1012 or the mark 1013 is formed on the 100 convex parts 1011, and the larger the number of the structures, the finer the characters of the latent image appearing by the forgery prevention structure 1010, the easier the curve or the like can be expressed.
A method of manufacturing the forgery prevention sheet 1001 configured as described above will be described below.
First, a plurality of marks 1012 and 1013 in a circular shape are printed in a 10 × 10 matrix on the region where the forgery prevention structure 1010 is provided in the sheet base material 1002. Marks 1013 are printed at positions where "T" is formed in a matrix of 10 × 10, and marks 1012 are printed at other positions. The combination of the marks 1012 and 1013 is set in advance as print data based on a latent image (T in this embodiment) appearing on the forgery prevention structure 1010. The marks 1012 and 1013 may be printed simultaneously with the preprinting or after the preprinting.
Next, in the region where the marks 1012 and 1013 are printed, a plurality of convex portions 1011 are formed by pressing the embossing plate from the side of the flat portion 1003 of the sheet base material 1002. The embossed plate has the convex portions 1011 at the same pitch as the marks 1012 and 1013, and the mark portions 1012 and 1013 are formed around the entire circumference of the side surface 1011a of the convex portion 1011 by forming the convex portions 1011 so as to overlap the marks 1012 and 1013.
After the forgery-preventing sheet 1001 is manufactured as described above, information corresponding to the application is printed on the information printing area 1004 of the sheet base material 1002 and used.
The operation of the forgery prevention sheet 1001 will be described below.
First, the operation of the forgery prevention sheet 1001 shown in fig. 21a to 21e when viewed from the front surface, that is, the normal direction of the flat surface portion 1003 of the sheet base material 1002 will be described.
Fig. 22a is a view showing reflection of light of the convex portions 1011 constituting the first convex portion group, which acts when the forgery prevention sheet 1001 shown in fig. 21a to 21e is viewed from the front, fig. 22b is a view showing a view of the mark 1013 of reflection of light shown in fig. 22a, fig. 22c is a view showing reflection of light of the convex portions 1011 constituting the second convex portion group, which acts when the forgery prevention sheet 1001 shown in fig. 21a to 21e is viewed from the front, fig. 22d is a view showing a mark 1012 of reflection of light shown in fig. 22c, and fig. 22e is a view showing marks 1013, 1013 of the forgery prevention structure 1010 of the forgery prevention sheet 1001 shown in fig. 21a to 21 e.
When the forgery prevention sheet 1001 shown in fig. 21a to 21e is viewed from the front, the side surface 1011a of the convex portion 1011 formed on the sheet base material 1002 is not opposed to the observation direction, and therefore, light from the observation direction is also reflected in a direction other than the observation direction, and the amount of light received in the observation direction of the reflected light is reduced. Since the mark 1013 provided in the forgery prevention structure 1010 is provided on the side surface 1011a of the projection 1011, light from the observation direction is reflected and dispersed on the mark 1013 in a direction other than the observation direction as shown by a broken line in fig. 22a, and thus the mark 1013 is in a state of being weakly visible as shown in fig. 22 b.
Similarly, since the mark 1012 provided on the forgery prevention structure 1010 is provided on the side surface of the convex portion 1011, when the forgery prevention sheet 1001 is viewed from the front, light from the observation direction is reflected and dispersed on the mark 1012 in the other directions than the observation direction as shown by the broken line in fig. 22c, and the mark 1012 is in a state of being weakly visible as shown in fig. 22 d.
Therefore, when the forgery prevention sheet 1001 is viewed from the front, as shown in fig. 22e, since the marks 1012 and 1013 are only weakly visible, the difference between the tone scale of the mark 1013 of the side surface 1011a of the convex 1011 forming the first convex group and the tone scale of the mark 1012 of the side surface 1011a of the convex 1011 forming the second convex group cannot be clearly recognized, and thus only the convex 1011 forming the first convex group and the convex 1011 forming the second convex group can be blurred and the latent image "T" of the convex 1011 forming the first convex group on which the mark 1013 is formed on the side surface 1011a cannot be clearly recognized. When the angle formed by the side surface 1011a of the convex portion 1011 and the flat surface portion 1003 is close to 90 degrees, the line widths of the mark 1012 and the mark 1013 formed on the side surface 1011a of the convex portion 1011 are different from each other, but when the forgery prevention sheet 1001 is viewed from the front, it is difficult to recognize the line width difference, and therefore, only the convex portions 1011 forming the first convex portion group and the convex portions 1011 forming the second convex portion group can be recognized with blur.
As described above, when the forgery prevention sheet 1001 shown in fig. 21a to 21e is viewed from the front, it is difficult to recognize the latent image "T" formed by the convex portions 1011 constituting the first convex portion group.
Next, an operation when the viewing direction of the forgery-inhibited sheet 1001 shown in fig. 21a to 21e is changed from the front side, that is, the normal direction of the flat surface portion 1003 of the sheet base material 1002 will be described.
Fig. 23a is a view showing reflection of light of the convex portions 1011 constituting the first convex portion group when the viewing direction of the forgery-prevention sheet 1001 shown in fig. 21a to 21e is changed from the front, fig. 23b is a view showing reflection of light of the convex portions 1011 constituting the second convex portion group when the viewing direction of the forgery-prevention sheet 1001 shown in fig. 21a to 21e is changed from the front, and fig. 23c to 23f are views showing marks 1012 and 1013 of the forgery-prevention structure 1010 when the viewing direction of the forgery-prevention sheet 1001 shown in fig. 21a to 21e is changed from the front.
When the viewing direction of the forgery-prevention sheet 1001 shown in fig. 21a to 21e is changed from the front, the viewing direction is close to the direction facing the side surface 1011a of the convex portion 1011 formed on the sheet base material 1002. As described above, the light from the observation direction is reflected by the side surface 1011a of the convex portion 1011 as it is in the observation direction, and the amount of light received in the observation direction of the reflected light increases. Since the mark 1013 provided on the forgery prevention structure 1010 is provided on the side surface 1011a of the convex 1011 formed on the sheet base material 1002, light from the observation direction is reflected on the mark 1013 in the observation direction as shown by the chain line in fig. 23a, and thus the mark 1013 can be clearly seen.
Further, since the mark 1012 provided on the forgery prevention structure 1010 is provided on the side surface 1011a of the convex 1011 formed on the sheet base material 1002, light from the observation direction is reflected on the mark 1012 in the observation direction as shown by the chain line in fig. 23b, and thereby the mark 1012 can be clearly seen.
Therefore, when the viewing direction of the forgery-preventing sheet 1001 is changed to, for example, the lower side in fig. 21a, as shown in fig. 23c, the difference in line width between the mark 1012 and the mark 1013, that is, the difference in gradation ratio between the side faces 1011a of the convex portions 1011 constituting the first convex portion group and the gradation ratio between the side faces 1011a of the convex portions 1011 constituting the second convex portion group due to the difference in line width becomes clear, and thereby the latent image "T" formed by the convex portions 1011 formed with the mark 1013 appears and becomes visible. At this time, when the convex portions 1011 are formed to be close to each other or the viewing direction of the forgery-preventive sheet 1001 is largely changed from the normal direction of the sheet base material 1002, the mark 1012 formed on the side surface 1011a of the convex portion 1011 constituting the second convex portion group is hidden and invisible by the convex portion 1011 adjacent to the viewing direction side of the convex portion 1011, and the latent image formed by the mark 1013 is easily visually recognized. This effect is more easily obtained in the region where the mark 1012 is formed farther from the top 1011b of the convex 1011.
Here, in the forgery prevention sheet 101 shown in fig. 21a to 21e, the marks 1012 and 1013 for visualizing the latent image in accordance with the observation direction are provided around the entire side surface 1011a of the convex portion 1011 formed on the sheet base material 1002, and the color tone ratio formed by the mark 1012 on the side surface 1011a of the convex portion 1011 formed with the mark 1012 and the color tone ratio formed by the mark 1013 on the side surface 1011a of the convex portion 1011 formed with the mark 1013 are different from each other when viewed from the same direction, and therefore, the latent image appears and is visible regardless of the change in the observation direction from the normal direction of the plane portion 1003 of the sheet base material 1002. For example, when the direction of observation of the forgery-preventive sheet 1001 is changed to the upper side in fig. 21a, the latent image "T" formed by the mark 1013 appears as shown in fig. 23d and can be seen, when the direction of observation of the forgery-preventive sheet 1001 is changed to the right side in fig. 21a, the latent image "T" formed by the mark 1013 appears as shown in fig. 23e and can be seen, and when the direction of observation of the forgery-preventive sheet 1001 is changed to the left side in fig. 21a, the latent image "T" formed by the mark 1013 appears as shown in fig. 23f and can be seen.
When the above-described forgery prevention sheet 1001 is copied, the information printed on the information printing area 1004 of the sheet base material 1002 or the marks 1012 and 1013 provided on the sheet base material 1002 by printing are copied, but the convex portions 1011 cannot be reproduced. Therefore, even when the observation direction of the copied object is changed, the scene of the marks 1012 and 1013 does not change, and the latent image formed by the mark 1013 does not appear, whereby the authenticity can be determined. In this way, in the forgery-preventing sheet 1001 of the present embodiment, even when the observation direction of the forgery-preventing sheet 1001 is changed in any direction from the normal direction of the flat surface portion 1003 of the sheet base material 1002, the appearance of the marks 1012 and 1013 changes, and the latent image formed by the mark 1013 appears and is visible, so that the forgery-preventing sheet 1001 can be easily judged without being limited by the observation direction. Further, since the convex portions 1011 are formed by recessing the planar portion 1003 of the sheet base material 1002, when the sheet base material 1002 is viewed from the front and back or is directly contacted with it, the convex portions 10011 are difficult to recognize, the convex portions 1011 are difficult to reproduce, and the forgery prevention function can be improved.
Of the marks 1012 and 1013 provided on the forgery prevention structure 1010, the mark 1013 formed on the convex 1011 constituting the first convex group may be formed not only on the side 1011a but also on the top 1011b of the convex 1011.
In this embodiment, although the case where the line width of the mark part 1013 constituting the first convex part group formed on the side surface 1011a of the convex part 1011 representing the latent image "T" is larger than the line width of the mark part 1012 constituting the second convex part group formed on the side surface 1011a of the other convex part 1011 has been described as an example, the line width of the mark part 1013 constituting the first convex part group and the line width of the mark part 1012 constituting the second convex part group may be different from each other, and the line width of the mark part 1013 constituting the first convex part group may be smaller than the line width of the mark part 1012 constituting the second convex part group.
In this embodiment, it is also conceivable to divide the mark 1013 in the circumferential direction and to make the colors of the plurality of divided regions different from each other. In this case, the authenticity can be determined by changing the color visually recognized according to the direction in which the forgery prevention structure 1010 is viewed.
(twelfth embodiment)
Fig. 24a is a diagram showing the entire structure of a forgery prevention sheet according to a twelfth embodiment of the forgery prevention medium of the present invention, fig. 24b is a diagram showing the detailed structure of the forgery prevention structure 1110 shown in fig. 24a, fig. 24c is a sectional view a-a' shown in fig. 24b, fig. 24d is a diagram showing the structure of the recess 1111 provided with the character mark 1112 shown in fig. 24b, and fig. 24e is a diagram showing the structure of the recess 1111 provided with the background mark 1113 shown in fig. 24 b.
As shown in fig. 24a to 24e, a forgery prevention sheet 1101 of the present embodiment is formed by providing a forgery prevention structure 1110 in a partial region of a sheet base material 1102 made of paper. The sheet base material 1102 has a planar portion 1103 serving as a base material surface, and an information printing region 1104 is provided in a partial region of the planar portion 1103 and a forgery prevention structure 1110 is provided in another region. The forgery prevention sheet 1101 configured as described above can be used as a ticket for a concert or the like. In this case, the content of the concert, the name of the concert field, the number of seats, and the like are printed on the information printing area 1104. In addition, it is conceivable that a predetermined color is printed or colored on the sheet base material 1102 as a preprinting before information is printed on the information printing area 1104 of the sheet base material 1102, and in this case, it is necessary to make the latent image of the forgery prevention structure 1110 invisible.
As shown in fig. 24b, the forgery prevention structure 1110 provided on the sheet base material 1102 includes: a plurality of concave portions 1111 which are embossed portions formed in a matrix on the sheet base material 1102; a character mark 1112 as a first mark provided only in a predetermined recess 1111 of the plurality of recesses 1111; a background mark 1113 which is a second mark provided on the recess 1111 not provided with the character mark 1112 among the plurality of recesses 1111. As shown in fig. 24c, the recess 1111 has a circular shape with a diameter of 0.5mm or less at a boundary portion with the flat portion 1103, which is recessed from the flat portion 1103 by about 0.1mm in the thickness direction of the sheet base 1102. As the cross-sectional area gradually decreases away from the boundary portion, as shown in fig. 24d and 24e, the opposite side of the boundary portion becomes a bottom portion 1111b parallel to the planar portion 1103. Therefore, inner surface 1111a of recess 1111 faces in a direction inclined with respect to the normal line of planar portion 1103. Character portion mark 1112 is printed in a predetermined recess among the plurality of recesses 11111111a of the inner side surface 1111a is formed to have a first depth d from the flat surface portion 11031The concave portion 1111 is provided over the entire circumference, and the boundary portion between the concave portion 1111 and the planar portion 1103 is formed in a circular shape, and the sectional area of the concave portion 1111 gradually decreases as it goes away from the boundary portion, so that the concave portion 1111 is formed in a circular shape when viewed from the normal direction of the planar portion 1103 of the sheet base 1102. The background portion mark 1113 has a second depth d from the flat portion 3 by printing the depth of the inner surface 11a of the recess 1111, in which the character portion mark 1112 is not provided, in the plurality of recesses 11112The concave portion 1111 is provided over the entire circumference, and the boundary portion between the concave portion 1111 and the planar portion 1103 is formed in a circular shape, and the sectional area of the concave portion 1111 gradually decreases as it goes away from the boundary portion, so that the concave portion 1111 is formed in a circular shape when viewed from the normal direction of the planar portion 1103 of the sheet base 1102. Here, the depth d of the character portion mark 1112 is provided on the inner surface 1111a of the recess 11111And a depth d provided with a background portion mark 11132In the middle, a depth d of the background part mark 1113 is set2Depth d of the character part mark 11121Deep. In this embodiment, for convenience of explanation, the forgery prevention structure 1110 shown in the figure is a structure in which 10 concave portions 1111 are formed in each of the vertical and horizontal directions, and as the number of concave portions increases, characters of a latent image appearing by the forgery prevention structure 1110 become finer, and a curve or the like is more easily expressed.
A method of manufacturing the forgery prevention sheet 1101 configured as described above will be described below.
Fig. 25a and 25b are views for explaining a method of manufacturing the forgery-preventing sheet 1001 shown in fig. 24a to 24e, and show only a region where the forgery-preventing structure 1110 is provided in the sheet base material 1002.
First, as shown in fig. 25a, a character part mark 1112 and a background part mark 1113 are printed in a circular shape on the region of the sheet base material 1002 where the forgery prevention structure 1110 is provided. Character portion marks 1112 are printed at positions where latent images "T" are formed in 10 × 10 matrix regions where the recessed portions 1111 are provided, and background portion marks 1113 are printed at positions where character portion marks 1112 are not printed in 10 × 10 matrix regions. The character part mark 1112 and the background part mark 1113 have similar shapes to each other, and as described above, the character part mark 1112 has a diameter larger than that of the background part mark 1113 so that the depth of the background part mark 1113 from the flat part 1103 is larger than the depth of the character part mark 1112 from the flat part 1103 when the recess 1111 is formed in the region where the character part mark 1112 and the background part mark 1113 are provided. The combination of the character part mark 1112 and the background part mark 1113 is set in advance as print data based on a latent image (T in this embodiment) appearing on the forgery prevention structure 10. The character part mark 1112 and the background part mark 1113 may be printed simultaneously with the preprinting or after the preprinting.
Next, as shown in fig. 25b, a plurality of concave portions 1111 are formed on the region where the character portion mark 1112 is printed and the region where the background portion mark 1113 is printed, respectively, by using an embossing plate. In this case, concave portion 1111 is formed such that the outer side of character portion label 1112 and background portion label 1113 are respectively located at the boundary portion with planar portion 1103, and thus character portion label 1112 and background portion label 1113 are respectively formed in the shape provided on the entire circumference of inner surface 1111a of concave portion 1111.
After the forgery-preventing sheet 1001 is manufactured as described above, information corresponding to the application is printed on the information printing region 1004 of the sheet base material 1002 and used. In addition, it is also conceivable that, in the formation of the concave portion 1111, a transparent resin is applied to the inner side of the character portion mark 1112 and the background portion mark 1113 of the sheet base material 1002 without using an embossing plate, and the concave portion 1111 is formed by embedding the transparent resin into the sheet base material 1002 after the transparent resin is cured.
The operation of the forgery prevention sheet 1001 will be described below.
First, the operation of the forgery prevention sheet 1001 shown in fig. 24a to 24e when viewed from the front surface, that is, the normal direction of the flat surface portion 1003 of the sheet base material 1002 will be described.
Fig. 26a is a view from the cross-sectional direction for explaining the operation when the forgery prevention sheet 1001 shown in fig. 24a to 24e is viewed from the front, and fig. 26b is a view showing the appearance of the character part mark 1112 and the background part mark 1113 of the forgery prevention structure 1110 when the forgery prevention sheet 1001 shown in fig. 24a to 24e is viewed from the front.
As shown in fig. 26a, when the forgery prevention sheet 1001 shown in fig. 24a to 24e is viewed from the normal direction of the planar portion 1003 which is the front surface, since the character portion mark 1112 and the background portion mark 1113 which are respectively provided on the plurality of concave portions 1111 are not hidden from the viewing direction, all the character portion mark 1112 and the background portion mark 1113 can be visually recognized as shown in fig. 26 b.
The character part mark 1112 and the background part mark 1113 are provided in the inner surface 1111a of the recess 1111 at different depths from the plane portion 1103, but have similar shapes to each other, and are recognized as being formed in parallel with each other as being recognized as substantially the same shape by observing the forgery prevention sheet 1001 from the front in the depth direction. The finer the concave portions 1111 are, the more easily they are recognized as substantially the same shape.
Next, an operation when the viewing direction of the forgery-inhibited sheet 1001 shown in fig. 24a to 24e is changed from the front side, that is, the normal direction of the flat surface portion 1003 of the sheet base material 1002 will be described.
Fig. 27a is a view, viewed in cross section, illustrating the effect of changing the viewing direction of the forgery-prevention sheet 1001 shown in fig. 24a to 24e from the front, and fig. 27b is a view illustrating an angle θ of the viewing direction of the planar portion 1003 when the background portion marker 1113 shown in fig. 27a is not seen1And FIG. 27c is a view showing the angle θ shown in FIG. 27b1Fig. 27d to 27g are views showing the appearance of the character part mark 1112 and the background part mark 1113 in the forgery prevention structure 1110.
When the viewing direction of the anti-counterfeit sheet 1101 shown in fig. 24a to 24e is changed from the front, the viewing direction of the planar portion 1103 of the sheet base material 1102 is changedBecomes an acute angle. As shown in fig. 27b, the angle formed in the observation direction of the planar portion 1103 of the sheet base 1102 is smaller than the angle θ1In this case, of character portion marks 12 and background portion marks 13 provided on inner surface 1111a of recess 1111, background portion mark 13 is hidden from view by the edge of planar portion 1103 on the observation direction side of recess 1111 provided with background portion mark 1113. Further, as shown in fig. 27b, a distance w in a direction parallel to planar portion 1103 between background portion marker 1113 and an edge of planar portion 1103 on the observation direction side of recess 1111 in which background portion marker 1113 is provided is set to1The depth of the background portion marker 1113 from the flat portion 1103 is t1In this case, the background portion marker 1113 is hidden by the edge of the planar portion 1103 and cannot be seen at the angle θ1By an angle theta1＝tan-1(t1/w1) And (4) showing.
On the other hand, in the character portion mark 1112, even if the angle formed in the direction of observation of the plane portion 1103 of the sheet base material 1102 is the angle θ at which the background portion mark 1113 is not visible1In this case, as shown in fig. 27c, the concave portion 1111 provided with the character mark 1112 is not hidden by the flat surface portion 1103 on the observation direction side.
Therefore, the viewing direction of the forgery prevention sheet 1101 is changed to, for example, the lower side in fig. 24a, and the angle formed by the viewing direction of the planar portion 1103 of the sheet base material 1102 is made smaller than θ1In this case, only the character part mark 1112 is visible from the character part mark 1112 and the background part mark 1113 provided on the inner surface 1111a of the recess 1111, and as shown in fig. 27d, a latent image "T" formed by the character part mark 1112 appears and is visible.
Here, in the forgery prevention sheet 1101 shown in fig. 24a to 24e, since the character portion mark 1112 constituting the latent image appearing in the observation direction is provided over the entire circumference of the inner surface 1111a of the concave portion 1111 formed in the sheet base 1102, the angle formed between the plane portion 1103 of the sheet base 1102 and the observation direction is smaller than θ1In this case, the latent image of the character portion mark 1112 appears and is visible when viewed from any direction. For example, makeWhen the direction of observation of the forgery-prevention sheet 1101 is changed to the upper side in fig. 24a, the latent image "T" formed by the character portion marks 1112 appears as shown in fig. 27e and is visible, when the direction of observation of the forgery-prevention sheet 1101 is changed to the right side in fig. 24a, the latent image "T" formed by the character portion marks 1112 appears as shown in fig. 27f and is visible, and when the direction of observation of the forgery-prevention sheet 1101 is changed to the left side in fig. 24a, the latent image "T" formed by the character portion marks 1112 appears as shown in fig. 27f and is visible.
The angle formed by the planar portion 1103 of the sheet base material 1102 and the observation direction is smaller than θ1In the case of the character portion mark 1112 and the background portion mark 1113 provided on the inner surface 1111a of the recess 1111, as described above, the background portion mark 1113 is hidden from view, and as shown in fig. 27c, the angle formed by the planar portion 1103 of the sheet base 1102 and the observation direction is further reduced so that the angle of the observation direction with respect to the planar portion 1103 of the sheet base 1102 is smaller than the angle θ2In this case, character mark 1112 provided on inner surface 1111a of recess 1111 is hidden from view by edge of planar portion 1103 on the observation direction side of recess 1111 on which character mark 1112 is provided. That is, the angle θ formed with respect to the observation direction of the planar portion 1103 of the sheet base 1102 is θ2≤θ≤θ1In this case, only the character mark 1112 and the background mark 1113 provided on the inner surface 1111a of the recess 1111 can be visually recognized, and the latent image "T" appears and can be seen. Further, as shown in fig. 27c, a distance w in a direction parallel to the planar portion 1103 between the character portion mark 1112 and an edge of the planar portion 1103 on the observation direction side of the recess 1111 in which the character portion mark 1112 is provided2The depth of the character portion mark 1112 from the flat portion 1103 is t2At this time, the character portion mark 1112 is hidden by the edge of the flat portion 1103 and is not visible at the angle θ2By an angle theta2＝tan-1(t2/w2) And (4) showing.
When the above-described forgery prevention sheet 1101 is copied, the information printed on the information printing area 1104 of the sheet base material 1102 or the character portion mark 1112 and the background portion mark 1113 provided on the sheet base material 1102 by printing are copied, but the concave portion 1111 cannot be reproduced. Therefore, even when the viewing direction of the copied matter is changed, the latent image of the character part mark 1112 does not appear, and thus the authenticity can be discriminated. When the authenticity is determined in this manner, in the forgery-preventing sheet 1101 of the present embodiment, even if the direction of observation of the forgery-preventing sheet 1101 is changed in any direction from the direction of the normal line of the planar portion 1103 of the sheet base material 1102, the latent image of the character portion mark 1112 appears and is visible, and therefore the authenticity determination of the latent image can be easily performed without being limited by the direction of observation.
In the above embodiment, the height of the convex portion from the flat surface portion, the depth of the concave portion from the flat surface portion, or the size of the boundary portion with the flat surface portion is not limited to the above, and may be set as appropriate.
In addition, in the convex or concave portion, a shape of a cone or a hemisphere having a cylindrical shape or no top is also considered. Further, a case where the cross section is rectangular is also considered.
The information as the latent image is not limited to the case where a plurality of projections or recesses form rows and columns as in the case of the above-described "T", and a plurality of projections or recesses may form only rows or only columns. The present invention is not limited to the above-described embodiments, and the present invention may be applied to a display device. Further, it is also conceivable that a plurality of projections representing latent images are divided into a plurality of regions, and characters or the like are displayed in each of the plurality of regions. Further, the plurality of projections or recesses around the latent image may be partially opened to surround the region where the plurality of projections or recesses representing the latent image are formed, instead of the shape in which the plurality of projections or recesses surrounding the latent image completely surround the region where the plurality of projections or recesses representing the latent image are formed.
In the above-described embodiment, the plurality of convex portions or concave portions are formed in rows and columns in parallel with the arrangement direction of the plurality of periodic gradation regions or mark portions, etc., but the direction of the rows and columns formed by the plurality of convex portions or concave portions may have a slight angle with respect to the arrangement direction of the plurality of periodic gradation regions or mark portions, etc.
In the above-described embodiment, the case where the forgery prevention sheet having the forgery prevention structure is provided on the sheet base material made of paper has been described as the forgery prevention medium, but the present invention is not limited to the forgery prevention sheet, and can be applied to the case where the forgery prevention structure is provided on the sheet base material made of a thin film or the card base material formed by laminating a plurality of resin layers.

Claims (1)

1. A forgery-prevention medium having:
a display unit in which the first and second color matching units are combined and arranged in a predetermined arrangement;
embossed portions provided on the display portion in a predetermined arrangement so as to entirely or partially overlap the first and second color matching portions,
the first color matching part is arranged on the surface of the base material,
the second color matching parts have a different color from the first color matching parts, are arranged in rows and/or columns on the first color matching parts at a constant period,
the embossing part has:
a plurality of first convex portions having a shape in which apex portions are removed from a cone, and being formed in a predetermined region of the first color matching portions in parallel with the arrangement direction of the plurality of second color matching portions in rows and/or columns so as to have the constant period, the areas of the first color matching portions and the second color matching portions being different from each other in each of two regions divided by the center line of any first convex portion parallel to the surface of the base material;
and a plurality of second convex portions having a shape in which apex portions are removed from a cone, and forming rows and/or columns that are parallel to the arrangement direction of the plurality of second color matching portions and are shifted from the rows and/or columns of the plurality of first convex portions, wherein the second convex portions are formed in regions other than the predetermined regions in the first color matching portions at the constant period, and wherein areas of the first color matching portions and the second color matching portions are different from each other in each of two regions that are separated by a center line parallel to the center line, and a magnitude relationship of the areas is inverted in a region on the same direction side of the first convex portions across the center line.
HK10112276.8A 2007-12-20 Anticounterfeit medium HK1146019B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2007/074544 WO2009081461A1 (en) 2007-12-20 2007-12-20 Anticounterfeit medium

Publications (2)

Publication Number Publication Date
HK1146019A1 true HK1146019A1 (en) 2011-05-13
HK1146019B HK1146019B (en) 2012-12-07

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Publication number Publication date
CN101896362A (en) 2010-11-24
CN101896362B (en) 2012-08-08
WO2009081461A1 (en) 2009-07-02

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