JP2009126063A - Security sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a security sheet with high anti-counterfeit capability. <P>SOLUTION: A security mark 73, having a property to become visibly elicited by ultraviolet irradiation, whose carved part 75 is scraped off accompanying the carving of the identification image 69, is provided on the surface side of the carving layer 65 in the carving area 71 so that a part thereof overlaps the identification image 69 in the laminating direction. When ultraviolet is directed to the sheet surface 67 to irradiate it by use of the ultraviolet irradiation machine 77, the security mark 73 with the carved part 75 exactly corresponding to the identification image 69 scraped off becomes visibly elicited in a manner that the continuity of the marking image is partly broken. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a security sheet in which forgery / alteration (hereinafter referred to as “falsification / alteration”) such as a driver's license, employee ID card, passport, or diploma is socially required. The present invention relates to a security sheet having anti-alteration properties.

  For example, a security sheet with personal information such as a person's name or address or an identification image such as a face photo, such as a driver's license, employee ID card, passport, or diploma, has been impersonated. There is a strong social demand that third parties should not allow misuse. In view of such social demands, security sheets are required to have a high function of preventing falsification.

  In order to meet such social demands, for example, Patent Document 1 discloses that in an openwork paper composed of a support layer and an engraving layer, the opacity of the support layer is 70% or less and the opacity of the engraving layer is 40% or more. The opacity of the support layer is always lower than the opacity of the engraving layer, and the difference in opacity between the support layer and the engraving layer is 30% or more, so that the engraving from the engraving layer to the support layer is performed. Openwork paper is known.

  The inventor also has a support layer, one pre-printed image, a watermark engraving layer integrally provided on the support layer, the other pre-printed different image, and a surface A backside watermark mat layer integrally provided under the support layer, and a watermark printing layer integrally provided under the watermark engraving layer and the backside watermark mat layer. The transmission density of the support layer is 0.15 or less, the transmission density of the support layer, the engraving layer, and the back surface mat layer is 0.15 or more and 1.00 or less, and the engraving surface gloss is 10. A security sheet for important documents with a small number of individuals of 0% or less has been proposed (see, for example, Patent Document 2).

  By the way, in such a security sheet, it is preferable to provide a security mark typified by a so-called tally in order to enhance forgery and alteration prevention.

  However, in a security sheet on which an identification image such as personal information or a facial photograph is engraved, it is a problem how to effectively provide a security mark from the viewpoint of ensuring anti-counterfeiting.

JP-A-6-15794 JP 2007-130855 A

  The problem to be solved relates to how to effectively provide a security mark from the viewpoint of ensuring anti-counterfeiting in a security sheet on which an identification image such as personal information or a facial photograph is engraved It is to provide a solution.

  An object of the present invention is to obtain a security sheet having a high anti-counterfeiting property, and is formed by laminating an engraving layer on a support layer, and an identification image for identifying an individual on the sheet surface of the engraving layer It is the security sheet that is engraved, and the sheet surface is provided with a security mark that has a property that becomes visible when irradiated with ultraviolet rays, and that is partially cut away by engraving of the identification image. Main features.

  The security sheet according to the present invention is a security sheet configured by laminating a sculpture layer on a support layer, and an identification image for identifying an individual is engraved on the sheet surface of the engraving layer, the sheet surface In addition, a security mark having a property that becomes visible and visible when irradiated with ultraviolet rays and a part of which is cut off by engraving of the identification image is provided. When the ultraviolet rays are irradiated, the security mark in which the portion corresponding to the engraved portion of the identification image is cut off becomes visible and visible in such a manner that the continuity of the mark image is partially cut off. Therefore, it is possible to determine the authenticity of the sheet by checking whether or not the consistency between the identification image and the image missing portion in the security mark is ensured. A secure security sheet can be obtained.

  The purpose of obtaining a security sheet with high anti-counterfeiting prevention property is that the sheet surface of the engraving layer has the property of becoming visible when exposed to ultraviolet rays, and a part of it is engraved by identification image engraving for individual identification Realized by providing a security mark that has been scraped.

  Hereinafter, a security sheet according to an embodiment of the present invention will be described in detail with reference to the drawings. Prior to the description of the security sheet according to the embodiment of the present invention, an image engraving apparatus used for engraving the security sheet will be described.

[Schematic configuration of image engraving device]
FIG. 1 is a schematic perspective view showing the appearance of the image engraving apparatus, FIG. 2 is a perspective view showing the main part of the image engraving apparatus, and FIG. 3A is an enlarged view of the engraving table provided in the reciprocating mechanism. FIG. 3B is an explanatory diagram showing a booklet-shaped engraved medium placed and fixed on the engraving table, and FIGS. 4 and 5 are comparative examples such as diplomas and certificates of recognition as engraved media. It is explanatory drawing which expands and shows the engraving table when a large-sized sheet-like medium is employ | adopted.

  As shown in FIG. 1, an image engraving apparatus 1 has an apparatus main body 2 in which a control device and the like are stored, and a medium to be engraved (for example, a security sheet according to the present invention) is placed and fixed thereon. The X-axis table (engraving table) 20 that reciprocates in the X-axis direction (lateral direction) and the Y-axis table (not shown) reciprocate in the front-rear direction with respect to the X-axis table 20, and the Z drive mechanism And an engraving head 10 for engraving the surface of the medium to be engraved that is reciprocated in the vertical direction.

  As shown in FIG. 2, the image engraving apparatus 1 includes an engraving head 10 that is vibrated on the basis of an input image signal and is equipped with an engraving needle for engraving an image on an engraved medium.

  The engraving head 10 is configured to be movable in the vertical direction by a driving mechanism such as a stepping motor, a timing belt, a ball screw, or the like included in the Z-axis driving unit 12 disposed behind the engraving head 10. The engraving head 10 is configured to be movable in the front-rear direction by a Y-axis table driven by a Y-axis drive unit 14 disposed thereunder.

  An X-axis driving device 16 is disposed in front of the engraving head 10. The X-axis drive device 16 includes a reciprocating mechanism (X-axis driving unit) 18 and an engraving table 20 provided on the mechanism 18 and reciprocating (moving) in the lateral direction (X-axis direction). Has been. FIG. 2 shows a state in which a booklet-like passport is held and fixed as the medium to be engraved 36 with respect to the engraving table 20.

  As shown in FIG. 3A, an engraving table 20 made of a nonmagnetic material such as aluminum is provided on the reciprocating mechanism 18, and the engraving table 20 is moved in the left-right (X-axis) direction by the operation of the reciprocating mechanism 18. Reciprocate.

  On the upper surface of the engraving table 20, a medium guide 22 in the X-axis direction and the Y-axis direction and a first clip 24 having elasticity are installed.

  The engraving table 20 is provided with fitting holes at four positions on the back surface, and permanent magnets 26 are embedded in the holes. A passport holder 28 is attached to the front end of the engraving table 20 with its tip inclined downward, and a second clip 30 having elasticity is provided on the passport holder 28.

  A medium holder 32 formed of an elastic magnetic metal plate is hinged to the rear end side of the engraving table 20 facing the mounting position of the passport holder 28. Engagement portions 32A are provided at both end portions of the medium holder 32, and the medium holder 22 is fixed by engaging with engaged portions 20B provided at corresponding positions on the front end portion of the engraving table 20. At the same time, the permanent magnet 26 embedded in the engraving table 20 magnetically attracts the medium holder 32 in close contact with the engraving reference surface 20A on which the medium to be engraved is placed.

  In the engraving table 20 configured as described above, first, the medium holder 32 is lifted upward to expose the engraving reference surface 20A of the engraving table 20 as shown in FIG. Next, the engraved page 36A of the booklet-shaped engraving medium 36 shown in FIG. 3B is brought into close contact with the engraving reference surface 20A, and the leading end 36B is sandwiched between the engraving reference surface 20A by the clip 24.

  At this time, positioning of the medium to be engraved 36 in the horizontal direction is performed by pressing the end portions 36B and 36C against the medium guide 22 that regulates the X direction and the Y direction. The remaining pages other than the engraved page 36 </ b> A are folded back together and placed on the passport holder 28, and the rear end portion thereof is held by the second clip 30.

  Next, the medium holder 32 is pressed against the engraved page 36A so that the page is sandwiched between the engraving reference surface 20A, and the engaging portion 22A is engaged with the engaged portion 20B using its elasticity. At this time, since the permanent magnet 26 magnetically attracts the medium holder 32 via the engraved page 36A, the engraved page 36A is pressed against the reference surface 20A by the medium holder 32 in a flat state, and is in close contact with the medium holder 32. It is firmly fixed.

  When the image engraving apparatus is driven after the fixing (holding) of the medium to be engraved 36 is completed, the portion of the engraved page 36A exposed from the engraving window 22B of the medium holder 32 is cut with the engraving needle, and the engraving image is obtained. Is generated.

  At that time, the engraving table 20 on the reciprocating mechanism 18 performs a high-speed reciprocating motion, and the engraving image is generated on the engraved page 36A by the cutting action by the engraving needle. For this reason, the page to be engraved 36A receives an acting force such as a displacement due to an inertial force or a separation from the engraving reference surface 20A due to a cutting resistance.

  However, due to the interaction between the clamping force of the first clip 24 and the second clip 30 and the magnetic attraction force of the permanent magnet 26 with respect to the medium holder 32, the medium to be engraved 36 resists the action force and the reference surface 20A of the engraving table 20 is. Therefore, a clear and accurate image engraving can be performed.

  After the image engraving is completed, the medium 36 to be engraved can be easily detached by releasing the engagement using the elasticity of the engaging portion 32A and releasing the medium holder 32.

  As described above, according to the engraving table 20 in the image engraving apparatus, when the booklet-shaped engraved medium 36 is firmly fixed, the magnetic attraction force and the holder 32 and the engraving table 20 Since the engagement force is used, it is not necessary to install a vacuum pump, a vacuum circuit, or the like and to finely process the suction groove or the suction hole with respect to the engraving reference surface, thereby simplifying the structure of the apparatus.

  When a relatively large sheet such as a diploma or a certificate is adopted as the engraved medium, as shown in FIGS. 4 and 5, a large-sized sheet-shaped engraving medium can be placed. The sculpture table 40 may be employed.

  That is, the engraving table 40 is provided in the reciprocating motion mechanism 18 and is enlarged to accommodate a relatively large medium to be engraved such as a diploma, and the medium holder 42 is also enlarged accordingly. .

  A medium guide 44 and a first clip 46 having elasticity are attached to an upper end portion of the engraving table 40, and a plurality of fitting holes are provided on the back surface thereof as described above, and the permanent magnet 26 is provided therein. Is buried.

  On the other hand, the engraving table 40 has a medium holding portion 40B bent downward at the front end, and a second clip 48 having elasticity is attached to the lower surface of the medium holding portion 40B. A medium holder 42 similarly formed of a magnetic metal plate is hinged to the rear end side of the engraving table 40 facing the mounting position of the medium holding portion 40B. Further, the engaged pieces 50 are attached to the front end portions on both sides of the engraving table 40 in the reciprocating direction. By engaging the engaging portion 42A at the tip of the medium holder 42 with the engaged piece 50, the medium holder 42 is fixed, and at the same time, the permanent magnet 26 embedded in the engraving table 40 sets the medium holder 42 to the reference plane. Magnetic attraction is performed so that it is in close contact with 40A.

  In the engraving table 40 configured as described above, the medium holder 42 is first lifted upward to expose the engraving reference surface 40A of the engraving table 40, and then the sheet-like engraved member 52 shown in FIG. 5B. 52A is sandwiched between the engraving reference surface 40A and the first clip 46.

  At this time, positioning of the medium to be engraved 46 in the horizontal direction is performed by pressing the first clip 46 until the leading end 52A hits and pressing the side end 52B against the medium guide 44. The remaining portion of the medium 52 to be engraved is folded into a cylindrical shape to form a curl shape 52C, and is placed so that the outer circumference of the arc contacts the medium holding portion 40B formed on the front end side of the engraving table 40. The leading end 52D is clamped by the second clip 44.

  Next, the medium holder 42 is pressed from above the engraved medium 52 so as to be in close contact with the reference surface 40A, and the engaging portion 42A is engaged with the engaged piece 50 using its elasticity. At that time, the permanent magnet 26 magnetically attracts the medium holder 42 via the medium 52 to be engraved, and the engraved part 52E is firmly fixed in a state of being in close contact with the reference surface 40A.

  By fixing the sheet-like engraved medium 52 in this way, even when the fan is caused by wind pressure generated by performing high-speed reciprocating movement during engraving, the curl shape 52C is formed and cylindrical. Since the rigidity of the paper piece can be increased and the air resistance can be made difficult, stable image engraving can be realized.

  According to the engraving table 40 described above, when using a sheet-like engraving medium, it is not necessary to make the reference surface of the engraving table large-scale over the entire engraving medium in order to curl into a cylindrical shape. Smaller and lighter can be achieved.

  In addition, since the medium to be engraved is curled into a cylindrical shape, it is possible to prevent the fanning caused by the wind pressure due to the reciprocating motion during engraving, so that stable image engraving can be realized.

  Next, a security sheet according to an embodiment of the present invention in which an identification image for identifying an individual is engraved using the image engraving apparatus configured as described above will be described in detail with reference to the drawings.

[Security sheet according to embodiments of the present invention]
(Schematic configuration of a security sheet according to an embodiment of the present invention)
FIG. 6 is an explanatory view showing an example in which the security sheet according to the present invention is applied to a personal authentication page portion in a passport as a medium to be engraved, and FIG. 7 is a main part AA of the security sheet according to the embodiment of the present invention. FIG. 8 is a cross-sectional view, FIG. 8 is a state explanatory diagram when performing authenticity determination in the security sheet according to the embodiment of the present invention, and FIG. 9 is a cross-sectional view of a principal part showing a modification of the security sheet according to the embodiment of the present invention. FIG. 10 is an explanatory diagram showing an example in which the security sheet according to the present invention is applied to an employee ID card.

  As shown in FIGS. 6 and 7, the security sheet (personal authentication page portion in the passport) 61 according to the embodiment is configured by laminating a support layer 63 and an engraving layer 65, and a sheet surface 67 of the engraving layer 65. In addition, a substantially rectangular engraving area 71 is provided on which an identification image 69 for identifying an individual is engraved. In this engraving area 71, an individual face photograph is engraved from the engraving layer 65 side as an identification image. The identification image referred to in the present invention is an image having a function of identifying an individual. For example, the personal name, address, age, gender, signature (see reference numeral “70” in FIG. 6), or imprint Or a concept including one or more combinations of facial photographs.

  The support layer 63 is a transparent synthetic resin sheet that is generally used (for example, polypropylene, polystyrene, polyethylene terephthalate, vinyl chloride, etc.), and any material can be used as long as it can obtain a certain degree of transparency. Can be used without. In general, the thickness of the support layer 63 is preferably about 0.1 to 0.3 mm. However, the appropriate thickness varies depending on the material, application, usage, versatility, and the like, and therefore, the thickness may be set as appropriate considering these comprehensively. In addition, the property of the material relating to softness greatly affects the preservation of engraving images. Therefore, for example, an appropriate one may be appropriately selected in consideration of the flexibility required for the security sheet. In addition, a hard transparent vinyl chloride sheet | seat etc. can be used suitably when printing a face photograph image by the inkjet system, a sublimation heat transfer system, etc. on the sheet | seat surface in a security sheet.

  The engraving layer 65 is made of, for example, silk screen ink composed of a resin (binder) and a filler (filler), white ink (filler is mainly titanium oxide, etc.) and mat ink (filler is mainly synthetic silica, carbonic acid). The silk screen ink produced by adjusting by mixing calcium, kaolins such as barium sulfate, talc and clay) and the like can be constituted by silk screen printing on the support layer 63. The properties of the silk screen ink vary greatly depending on the supplier and the type of the ink, and in order to obtain an appropriate transmission density and glossiness, it is necessary to examine the blending ratio each time. The thickness of the engraving layer 65 is 3 to 50 μm, and in the case of a certificate, 5 to 20 μm is preferable. The type of resin (binder) used for the engraving layer 65 is preferably changed according to the resin used for the support layer 63. This is because the adhesiveness is different between different types of resins. For example, when the support layer 63 is a polyester film, polyester or polyurethane is suitable for the type of resin (binder) used for the engraving layer 65. When the support layer 63 is hard vinyl chloride, polyurethane, vinyl chloride, vinyl acetate copolymer, or the like is suitable for the type of resin (binder) used for the engraving layer 65. What is necessary is just to adjust the hardness of the engraving layer 65 with the kind and addition amount of a hardening | curing agent.

  In consideration of watermark engraving of the identification image 69 in the engraving area 71 in the security sheet according to the embodiment, it is preferable that the following condition is satisfied. That is, there is a difference that can be recognized with the naked eye between the opacity of the support layer 63 and the opacity of the engraving layer 65, and the opacity of the support layer 63 is different from that of the engraving layer 65. It is preferable to satisfy the conditions that the security sheet configured to be lower than the transparency is engraved from the engraving layer 65 to the support layer 63 (see FIG. 7). This is because if these conditions are satisfied, a watermark engraving identification image that can be recognized with the naked eye can be obtained. Here, the watermark engraving is an engraving from the engraving layer 65 to the support layer 63 in the security sheet in which the opacity of the support layer 63 is lower than the opacity of the engraving layer 65 as described above. By doing so, it means obtaining the watermark engraving identification image 69 that can be recognized with the naked eye. On the other hand, in the floating engraving, there is a difference that can be recognized with the naked eye between the color density in the support layer 63 and the color density in the engraving layer 65, and in the support layer 63. By engraving from the engraving layer 65 to the support layer 63 in the security sheet configured so that the color density is higher than the color density in the engraving layer 65, a relief identification image that can be recognized with the naked eye is obtained. Say. Whether the watermark engraving or the floating engraving depends on the configuration on the security sheet side, and according to the image engraving apparatus disclosed in the embodiment of the present invention, both the watermark engraving and the floating engraving can be performed. Is possible.

  Now, on the surface side of the engraving layer 65 in the engraving area 71, there is provided a security mark 73 that is partly cut away by engraving the identification image 69. Here, the security mark in the present invention means that the identification image 69 provided on the security sheet maintains the integrity with the security sheet itself, in other words, the identification image is not falsified. A sign attached to prove that nothing has been done. In the example of FIG. 6, a plurality of security marks 73 are provided on the sheet surface 67 (for example, a required number such as four can be added). In providing a plurality of security marks 73 on the sheet surface 67, each of the individual marks 73 is considered in consideration that at least a part of at least one security mark 73 is positioned with respect to the identification image 69 in the engraving area 71. What is necessary is just to comprise so that the magnitude | size of itself and the space | interval between the marks 73 may be determined.

  The security mark 73 has a property of becoming visible when irradiated with ultraviolet rays, and the engraving portion is partially scraped off as the identification image 69 is engraved. Specifically, the security mark 73 is provided on the surface side of the engraving layer 65 on the sheet surface 67 by, for example, silk screen printing with ultraviolet light emitting ink.

  As the security mark 73, for example, a seal or a symbol that matches the purpose of the security sheet and proves the personal identity can be suitably used. Specifically, for example, when the security sheet is a passport, a seal or symbol of a country (for example, Japan) in which the individual has nationality can be used. Further, when the security sheet is an employee ID card, a seal or symbol of a company to which the employee belongs can be used. Further, when the security sheet is a university diploma, the university seal or symbol from which the individual graduated can be used.

  When the security mark 73 is provided on the sheet surface 67, for example, as shown in FIGS. 6 and 7, the outside of the engraving area 71 and an identification image (for example, a personal face photograph) 69 are bridged. It is preferable to provide in. In this way, as will be described in detail later, when the sheet surface 67 is irradiated with ultraviolet rays for the purpose of determining the authenticity of the security sheet, a portion 75 corresponding to the engraved portion of the identification image 69 is scraped off. The security mark 73 becomes visible in such a manner that the continuity of the mark image is partially broken. Accordingly, the authenticity of the sheet can be determined through checking whether or not the consistency between the identification image 69 and the image missing portion in the security mark 73 is ensured. A security sheet having a function for preventing alteration can be obtained.

(Operational effect of the security sheet according to the embodiment of the present invention)
In manufacturing the security sheet (passport) 61 according to the embodiment of the present invention, first, a plurality of (four) security marks 73 are formed on a sheet surface 67 formed by laminating the engraving layer 65 on the support layer 63. Prepare printed base paper (passport base paper). Then, the identification image 69 relating to the individual face photograph is watermark-engraved on the engraving area 71 on the base paper (passport base paper) using the image engraving apparatus 1 described above. Along with the watermark engraving of the identification image 69, the engraving portion of the security mark 73 arranged so as to bridge between the outside of the engraving area 71 and the identification image 69 is partially cut off.

  As a result, as shown in FIG. 8, when the ultraviolet ray irradiation device 77 is used to irradiate the sheet surface 67 with ultraviolet rays for the purpose of determining the authenticity of the security sheet, The security mark 73 from which the corresponding portion 75 has been removed becomes visible in a manner that the continuity of the mark image is partially cut off. Accordingly, the authenticity of the sheet can be determined through checking whether or not the consistency between the identification image 69 and the image missing portion in the security mark 73 is ensured. A security sheet having anti-alteration properties can be obtained.

[Others]
The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the gist of the invention read from the claims and the entire specification or the technical idea, and the security sheet accompanying such changes Is also included in the scope of the technical scope of the present invention.

  That is, for example, as the security sheet (passport) 61 according to the embodiment of the present invention, a mode in which the security mark 73 is provided on the sheet surface 67 so as to be exposed on the surface has been described as an example. Without being limited to the example, for example, as shown in FIG. 9, a transparent (ultraviolet ray transmissive) coating layer is formed on the surface of the security mark 73 in order to protect the security mark 73 from being scratched or peeled off. A configuration in which 79 is provided may be employed.

  Further, the security sheet 61 according to the embodiment of the present invention has been described by exemplifying a passport. However, the present invention is not limited to this example. For example, as shown in FIG. You may comprise so that it may apply. Since the employee ID 81 shown in FIG. 10 has the same basic configuration as the above-described example of the passport 61, common members are denoted by the same reference numerals and redundant description thereof is omitted. At the same time, focusing on the differences between the two, the employee ID card 81 is printed in full color on the sheet surface 67 at the position adjacent to the identification image 69 of the corresponding individual. With this configuration, the identification image 69 related to the watermark engraving and the face photograph 83 related to full color printing can be combined to further enhance the function of preventing falsification. Furthermore, for example, as shown in FIG. 11, the present invention may be configured to be applied to a diploma 91. Since the basic configuration of the diploma 91 shown in FIG. 11 is the same as that of the above-described employee ID 81, common reference numerals are given to common members between them, and duplicate descriptions thereof are omitted. With this configuration, the identification image 69 related to the watermark engraving and the face photo 83 related to full-color printing can be combined with each other in the same way as the employee ID card 81, thereby further enhancing the anti-counterfeiting function. It becomes.

  Finally, in the embodiment of the present invention, an example in which the identification image 69 is watermark engraved on the engraving area 71 in the security sheet 61 has been described. However, the present invention is not limited to this example. There is a difference that can be recognized by the naked eye between the color density in the support layer 63 and the color density in the engraving layer 65, and the color density in the support layer 63 is different in the engraving layer 65. Even if the security sheet configured to be darker than the color density is employed and the engraving area 71 is engraved from the engraving layer 65 to the support layer 63, the identification image 69 is lifted and engraved. Needless to say, it is good.

It is a schematic perspective view which shows the external appearance of an image engraving apparatus. It is a perspective view which shows the principal part in an image engraving apparatus. 3A is an explanatory diagram showing an engraving table provided in the reciprocating mechanism in an enlarged manner, and FIG. 3B is an explanatory diagram showing a booklet-shaped engraving medium placed and fixed on the engraving table. It is. It is explanatory drawing which expands and shows a sculpture table when employ | adopting sheet-like media, such as a diploma and a commendation certificate, as a to-be-sculpted medium. It is explanatory drawing which expands and shows a sculpture table when employ | adopting sheet-like media, such as a diploma and a commendation certificate, as a to-be-sculpted medium. It is explanatory drawing which shows the example which applied the security sheet which concerns on this invention to the personal authentication page part in the passport as a to-be-engraved medium. It is principal part sectional drawing of the security sheet which concerns on an Example of this invention. In the security sheet which concerns on an Example of this invention, it is a state explanatory drawing at the time of performing authenticity determination. It is principal part sectional drawing which shows the modification of the security sheet which concerns on an Example of this invention. It is explanatory drawing which shows the example which applied the security sheet which concerns on this invention to the employee ID card. It is explanatory drawing which shows the example which applied the security sheet which concerns on this invention to the diploma.

Explanation of symbols

1 Image engraving device 61 Passport (security sheet)
63 Support layer 65 Engraving layer 67 Sheet surface 69 Identification image 71 Engraving area 73 Security mark 75 Image missing part

Claims (8)

A security sheet that is configured by laminating an engraving layer on a support layer, and an identification image for identifying an individual is engraved on the sheet surface of the engraving layer,
The sheet surface is provided with a security mark that has a property that becomes visible by irradiation with ultraviolet rays, and that has been partially scraped off by engraving of the identification image.
Security sheet characterized by that. The security sheet according to claim 1,
The security mark is
From the outside of the engraving area related to the identification image on the sheet surface, provided over the identification image,
Security sheet characterized by that. The security sheet according to claim 1 or 2,
The security mark is
Printed on the sheet surface of the engraving layer with ultraviolet light-emitting ink,
Security sheet characterized by that. The security sheet according to any one of claims 1 to 3,
The security mark is
A plurality of the sheet surfaces are provided.
Security sheet characterized by that. The security sheet according to any one of claims 1 to 4,
The security mark is
A seal or symbol for authenticating an individual,
Security sheet characterized by that. It is a security sheet according to any one of claims 1 to 5,
The identification image is
One or more of personal name, address, age, gender, signature, seal, or face photo,
Security sheet characterized by that. The security sheet according to any one of claims 1 to 6,
There is a discernable difference between the opacity of the support layer and the opacity of the engraving layer, and the opacity of the support layer is greater than the opacity of the engraving layer. It is also configured low, and is engraved through the watermark from the engraving layer to the support layer.
Security sheet characterized by that. The security sheet according to any one of claims 1 to 6,
There is a difference recognizable with the naked eye between the color density in the support layer and the color density in the engraving layer, and the color density in the support layer is in the engraving layer. Constructed deeper than the color density, engraved from the engraving layer to the support layer,
Security sheet characterized by that.

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