JPH07271895A - Object to be detected whose trueness is to be checked, and method and device for checking trueness of the object - Google Patents

Abstract

PURPOSE:To obtain a high SN ratio without generating any trouble such as the embedding of a metal wire. CONSTITUTION:Many fluorescent polymer elements 12 are mixed with an object 10 to be detected at random. Each polymer element 12 is constituted of an element body consisting of high molecular material, the fine particles of fluorescent pigment included in the element body and a coating layer to be formed as necessary. These elements 2 are penetrated into a paper-made base material 11. A processor for checking the trueness of the object 10 optically scans the elements 12 in a scanning area 17 for the object 10 while moving the scanning area 17 at a prescribed speed in a process for preparing the object 10, converts its detection signal into a cipher code and records the cipher code in a code display part 18. In the case of judging the trueness of the object 10, the trueness is judged when a detection signal obtained by optically scanning the scanning area 17 by the processor corresponds to the cipher code.

Description

Detailed Description of the Invention

[0001]

This invention relates to important documents, securities, cash vouchers such as banknotes and checks, travelers checks, ID cards, CD cards, credit cards and other cards, passports, art works, boat racing, horse racing, etc. The present invention relates to a detected object whose authenticity is to be checked and whose authenticity is to be checked, such as a public competition voting ticket, etc., and a check method and device thereof.

[0002]

2. Description of the Related Art As a means for checking the authenticity of documents, patent application publication No. 63-501250 (USP 4,820,
No. 912), microwave checking methods and devices are known. In this prior art (Prior Art 1), a microwave is incident on a large number of metal wires randomly distributed in a document, and a unique digital mark corresponding to a response microwave flux is applied to an appropriate portion of the document according to a certain rule. I am recording. When determining the authenticity of the document, the microwave is incident on the document and the response microwave flux is collated with the digital mark. When the two coincide, it is determined that the document is genuine.

Further, as described in JP-A-6-8678 (Prior Art 2), it has been proposed to add a fluorescent dye / pigment to a pulp solution to dye or impregnate a fibrin such as cellulose. ing.

[0004]

In the checking means using microwaves as in the prior art 1, when the response microwave flux is measured, the SN ratio is deteriorated because it is easily affected by external noise. Further, since the detection device oscillates microwaves, it may be a noise source.
Moreover, microwave transmitters and receivers are generally large and costly.

If a metal wire is mixed with a thin object such as paper, the metal wire may be exposed on the surface. It is not preferable that the metal wire is exposed because it is noticeable in appearance. Moreover, it becomes an obstacle when printing or coloring the object to be detected, and rust may occur. In addition, when the object to be detected is bent, the metal wire may be bent to project onto the surface of the object to be detected, or the code unique to the object to be detected may differ from that at the time of creation of the object to be detected. It may be impossible. These problems are somewhat improved by making the wire diameter of the metal wire smaller, but they cannot be a fundamental solution. Further, thinning the metal wire is not realistic because it not only causes deterioration of the SN ratio but also leads to cost increase.

On the other hand, in the method of dyeing or impregnating a fibrous material with a fluorescent dye or pigment as in the prior art 2, it is necessary to select a fluorescent dye or the like having good dyeability or impregnation property with the fibrous material. Only limited fluorescent colors can be obtained. Moreover, in dyeing or impregnation, the maximum volume ratio of the fluorescent dye / pigment to the fibrous material is about 10%. For these reasons, the prior art 2 has a problem that the output of emitted light (fluorescent light) is extremely small and the S / N ratio is small. Further, in the case of the prior art 2, since the fibrin is dyed or impregnated with the fluorescent dye or pigment via water, the fluorescent dye or pigment remains after the fibrin is taken out from the pulp solution, and the productivity is reduced. In terms of efficiency, it is extremely inefficient.

Therefore, an object of the present invention is to have a high S / N ratio,
It is an object of the present invention to provide an object to be detected and a method and apparatus for checking the object, which are excellent in productivity and can avoid the problems that occur when burying a metal wire.

[0008]

The object to be detected of the present invention developed to achieve the above object comprises a base material made of a non-fluorescent material, and a scanning region provided at a specific position of the base material. A plurality of fluorescent polymer elements in which a fluorescent pigment is contained in a flexible element body made of a polymer material, the elements being randomly mixed in the scanning region so as to face an unspecified number of directions; And a code display section which is provided on a part of the material and in which information corresponding to a specific output obtained according to the fluorescent polymer element in the scanning area is coded and recorded.

When an inorganic fluorescent pigment is used as the fluorescent pigment, crystals of oxides such as Ca, Ba, Mg, Zn, and Cd, sulfides, silicates, phosphates, tungstates, etc. are the main components. And Mn, Zn, Ag, Cu, S
A pigment obtained by adding a metal element such as b or Pb or a rare earth element such as a lanthanoid as an active material and calcining, ZnO: Zn, Br ₅ (PO ₄ ) ₃ Cl: Eu, Z
n ₂ GeO ₄ : Mn, Y ₂ O ₃ : Eu, Y (P, V) O
₄ : Eu, Y ₂ O ₂ Si: Eu, or Zn ₂ GeO
₄ : Mn or the like is suitable.

Examples of the organic fluorescent pigment include diaminostilbene disulfonic acid derivatives, imidazole derivatives, coumarin derivatives, triazole, carbazole, pyridine, naphthalic acid, imidazolone derivatives, dyes such as fluorescein and eosin, and compounds having a benzene ring such as anthracene. Are suitable.

An example of the substrate is paper, and the fluorescent polymer element may be incorporated into the substrate together with the pulp fibers of the paper. An example of the polymer material used for the element body of the fluorescent polymer element is acrylic resin. This fluorescent polymer element may be covered with a coating layer having a color similar to that of the pulp fiber and transmitting part or all of the excitation light and the emitted light of the fluorescent pigment, if necessary.

The apparatus of the present invention for checking the authenticity of the object to be detected optically scans the fluorescent polymer element in the scanning region and captures the output which changes according to the distribution of the fluorescent polymer element. Optical detection means for obtaining a detection signal specific to the detected object, means for obtaining an encryption code by encrypting the detection signal, code writing means for recording the encryption code in the code display portion of the detected object, When the reading means for reading the cipher code recorded on the code display portion and the cipher code read by the reading means and the detection signal detected by the detecting means are collated with each other and the two correspond to each other, this object is detected. And a means for judging that the detected object is authentic.

[0013]

In the present invention, a large number of the fluorescent polymer elements are randomly mixed in the scanning area of the detection object in the production process for producing the detection object, and the scanning area is optically scanned. The obtained unique detection signal is used for checking the authenticity of the detected object. That is,
The optical detection means captures a detection signal corresponding to the distribution of the fluorescent polymer element in the scanning region while moving the object to be detected at a predetermined speed. This detection signal is based on the mixing density of the fluorescent polymer element, the size or arrangement direction of the fluorescent polymer element, the type of fluorescent polymer element (combination of fluorescent pigments).
Since it changes for each minute portion of the scanning area due to
Each scan area has a unique output pattern. This detection signal is encrypted by a specific rule when the detected object is created and recorded on the code display portion of the detected object.

In the process of verifying whether or not the object to be detected is authentic, the scanning area is optically scanned again to obtain a detection signal specific to this scanning area and to detect the object to be detected. The cipher code recorded on the code display portion is read, and when the cipher code and the detection signal correspond to each other, it is determined that the object to be detected is authentic.

Since the fluorescent polymer element mixed in the object of the present invention is sufficiently flexible as compared with the metal wire,
Even if the element is bent when mixed with a thin object to be detected, there is no problem that the element projects or breaks on the surface of the object to be detected. Therefore, the detected object can maintain a good surface state, does not rust, and can be printed or colored without problems. Further, it is also possible to prevent the distribution pattern of the elements from changing.

When the substrate is paper and the fluorescent polymer element is incorporated into the substrate together with the pulp fiber of the paper as in claim 3, the pulp fiber and the fluorescent polymer element are three-dimensional. Since they are entangled with each other (three-dimensionally), it is possible to avoid problems such as the fluorescent polymer element moving and peeling in the base material, and the fluorescent polymer element rising up on the surface of the base material. With
The detected object has high security.

[0017]

Embodiments of the present invention will be described below with reference to FIGS. As shown in FIG. 2, a large number of fluorescent polymer elements 1 are provided in the base material 11 of the object to be detected 10.
2 is randomly mixed so as to face an unspecified number of directions. The base material 11 is made of a non-fluorescent material such as paper or plastic. The fluorescent polymer element 12 is a fibrous element in which powder of the fluorescent pigment 14 is mixed in the inside of the element body 13 made of a polymer material, for example, as in the cross section shown in FIG. The fluorescent pigment 14 is selected from the above-mentioned inorganic or organic fluorescent pigments which have substantially no absorption region in the visible light region. Further, this fluorescent pigment 14 has higher security as long as the emitted light is not included in the visible light region.

An example of the polymer material used for the element body 13 is polyethylene, polyester, urethane or the like. In short, a well-known synthetic resin having appropriate flexibility can be applied, but acrylic resin is used as described later. Particularly suitable.

As an example of the method of manufacturing the fluorescent polymer element 12, a dry manufacturing method using a container 15 having a double structure as shown in FIG. 3 is applied. In this case, the polymer material 13a which is liquefied by heating at 200 ° C. to 500 ° C. is put in the outer chamber 15a of the container 15, and the powder of the fluorescent pigment 14 is put in the inner chamber 15b of the container 15. Then, both the polymer material 13a and the powder of the fluorescent pigment 14 are dropped from the nozzle 16 in the lower part of the container 15 or extruded by applying pressure, so that the polymer material 13a becomes the nozzle 16
The powder of the fluorescent pigment 14 is mixed into the inside of the polymer material 13a during the cooling and solidification of the fluorescent pigment.

These fluorescent polymer elements 12 are mixed so as to be contained in a specific scanning region 17 at a certain density when the object 10 to be detected is manufactured. In addition, a non-woven fabric is prepared in advance by the fluorescent polymer element 12, and the non-woven fabric is cut into an appropriate size to scan the detection region 1 of the detection object 10.
7 may be buried. Further, a plurality of types of fluorescent polymer elements that emit different emitted lights may be combined and mixed.

Although the fluorescent polymer element 12 in the illustrated example has a fibrous shape, it may be a ribbon or a foil. The cross-sectional shape of the element 12 is not limited to a circular shape, and may be, for example, a polygonal shape, a rectangular shape, an oval shape, or the like. The outer diameter (or thickness) of the fluorescent polymer element 12 depends on the size of the object to be detected 10, but is, for example, about 5 to 50 μm. The average particle size of the fluorescent pigment 14 is preferably 0.7 to 20 μm in terms of output,
In terms of manufacturing the element 12, 0.2 μm to (about 1/10 of the outer diameter of the element) is suitable. The mixing ratio of the fluorescent pigment 14 can be up to about 45% by volume.

A code display section 18 is provided on the detected object 10. The scanning area 17 is provided in the code display portion 18.
Unique information according to the distribution state of the fluorescent polymer element 12 in the above is encrypted and written by the processing device 20 described below.

The object 10 to be detected is optically scanned by a processing device 20 as shown in FIG. 4, for example. The processing device 20 includes a housing 25 and a transfer mechanism 26. The transfer mechanism 26 is configured to move the detected object 10 at a constant speed in the direction of arrow F in the figure by a transfer member 27 using a belt, rollers, or the like.

The head portion of the optical detecting means 30 is provided in the middle of the movement path of the object to be detected 10. As shown in FIG. 5, the optical detecting means 30 includes a light emitting element 32 for generating excitation light of the fluorescent pigment 14 by a driving unit 31,
A first lens 33 that makes the excitation light parallel light, a slit 34 that cuts a part of the excitation light and irradiates the scanning region 17 with the excitation light, and a second lens that condenses the emitted light generated in the scanning region 17. 40, a filter 41, a light receiving element 42 and the like. The filter 41 is an optical filter that absorbs excitation light and transmits emitted light. The filter 41 also absorbs external light when the external light is strong. The light receiving element 42 receives the emitted light and generates an electrical signal. A controller 50 described later is connected to the light receiving element 42 via an amplifier 43.

The processing device 20 includes a controller 50 using a microcomputer, a code writing unit 51 for recording the following encryption code on the code display unit 18 of the object to be detected 10, and a code display unit 18. A code reading unit 52 for reading the encrypted code is provided. The code writing section 51 and the reading section 52 are connected to a read / write circuit 53. Controller 50
Includes an A / D converter 60, a comparator 61, an encryption code converter 62, and the like. A display 65 is connected to the controller 50.

Next, the operation of the apparatus 20 of the embodiment will be described. FIG. 6 shows an outline of a process for producing the detected object 10. In step S1, the fluorescent polymer element 12 is mixed into the base material 11 when the base material 11 of the detection object 10 is manufactured. In step S2, the detected object 10 is moved in the arrow F direction at a predetermined speed by the transfer mechanism 26. This step S2 includes a scanning step S3 and a detecting step S4.

In the scanning step S3, the light emitting element 3
2 emits the excitation light of the fluorescent pigment 14, and the light receiving element 42 receives the emitted light of the fluorescent pigment 14. In this case, the transfer mechanism 26 moves the object to be detected 10 at a predetermined speed in the direction of the arrow F while the excitation light is scanned in the scanning region 17
When a plurality of minute portions of the scanning region 17 sequentially pass through the head portion of the optical detecting means 30 when the light is emitted, the emitted light enters the light receiving element 42. Therefore, the light receiving element 42 corresponding to the fluorescent polymer element 12 is received. Output signal changes with time.

Since the magnitude of the output signal changes depending on the density and diameter (or thickness), length and direction of the fluorescent polymer element 12 and the property of the fluorescent pigment 14, it is measured as a unique output voltage pattern. To be done. In this embodiment, in the detection step S4, the scanning area 17 is divided and detected for each minute time, and the output voltage for each minute time is ranked in a plurality of stages and digitized. Thus
A coded detection signal specific to the scanning area 17 is obtained. It should be noted that, when manufacturing the fluorescent polymer element 12, if a plurality of types of elements 12 using different fluorescent pigments 14 are combined, a more diverse output pattern can be obtained.

In the encryption step S5, the above-mentioned detection signal is encrypted by the encryption code converter 62 according to a specific rule. The code encrypted in this way is
In the writing step S6, the code is recorded on the code display section 18 by the magnetic head of the code writing section 51. The code display section 18 of this embodiment is a magnetic band, but the code code is displayed on the code display section 18 using a print head, for example.
May be recorded with an optically readable mark and code (for example, a bar code, a two-dimensional bar code, an OCR character, etc.), or a hologram in which the code is recorded may be stamped in order according to an encryption code. Good.

The processing device 20 is also used to check whether the detected object 10 is authentic or not. FIG. 7 shows an outline of the matching process for checking the authenticity of the detected object 10. Step S11 includes a scanning step S3 and a detection step S4 similar to the above-described process of creating the detected object 10. By scanning the scanning region 17 at a predetermined speed, a detection signal corresponding to the fluorescent polymer element 12 is generated. obtain.

In the code reading step S12,
The code reading unit 52 reads the encryption code recorded in the code display unit 18. This code is
In the code reproduction step S13, the code for verification is reproduced by being decrypted by the encryption code converter 62 based on a predetermined rule. And a determination step S
14, the collation code and the detection step S4
The detection signal detected in (1) is compared by the comparator 61, and only when the both match, it is determined that the detected object 10 is a genuine product, and the collation result is displayed on the display 65.

Since the processing device 20 optically detects the scanning region 17, even if the encryption code and other information are magnetically recorded in the code display portion 18 or other portions, these are also recorded. Does not destroy magnetic information. Since the detection signal is obtained optically, it is not easily affected by external noise.

The fluorescent polymer element 12 used in the object to be detected 10 is extremely flexible and has a high degree of flexibility so that it will not break even when bent. Therefore, even if the object 10 is bent and is mixed in a thin object 10 such as paper, the element 12 does not break and project onto the surface of the object 10. , It does not have any influence on the peculiar pattern when the detected object 10 is created.

The fluorescent polymer element 12 shown in FIG.
As described above, the fluorescent pigment 14 may be kneaded over the entire cross section of the element body 13 made of a polymer material. An example of the polymer material used for the element body 13 may be a thermoplastic resin such as polyethylene, polyester or urethane similar to the above-mentioned embodiment, but when the substrate 11 is paper, the element body 13 is preferably an acrylic resin. There is. The mixing amount of the fluorescent pigment 14 can be up to about 45% by volume.

As shown in FIG. 9, the fluorescent polymer element 12 is embedded in the base material 11 together with the pulp fibers 70 of the paper base material 11. The step of scooping the fluorescent polymer element 12 into the pulp fiber 70 can be carried out without any problem by a normal paper pulp manufacturing process. When the pulp fiber 70 and the fluorescent polymer element 12 are thus squeezed together, the pulp fiber 70 and the fluorescent polymer element 12 are entangled three-dimensionally (three-dimensionally), so that the fluorescent polymer element 12 is a base material. Since it is possible to avoid problems such as moving in 11 or peeling off, or the fluorescent polymer element 12 rising up on the surface of the substrate 11, the state stability of the fluorescent polymer element 12 is extremely high. In addition, the fluorescent polymer element 1
Since 2 is intertwined with the pulp fiber 70 three-dimensionally, forgery is difficult and security is improved.

The fluorescent polymer element 12 can be manufactured using the manufacturing apparatus 75 shown in FIG. The manufacturing apparatus 75 includes an acrylic solution supply unit 77 having a nozzle 76 for ejecting an acrylic solution, a solution tank 79 for containing a coagulating solution 78, and the like. As shown in the enlarged view of FIG. 11, a large number of acrylic pigments 80 mixed with the powder of the fluorescent pigment 14 are drawn out from the nozzle 76 and passed through the coagulating solution 78, so that a large number of the acrylic pigments 14 are introduced into the acrylic element body 13. The fluorescent polymer element 12 in which the fluorescent pigment 14 is mixed is obtained. The fluorescent polymer element 12 is cut into a suitable length.

The cross-sectional shape of the fluorescent polymer element 12 is not limited to a circle, and the opening cross-section of the nozzle 76 may be rectangular so that a fluorescent polymer element having a rectangular cross section or a polygonal cross section is manufactured. Good. The flat shape of the fluorescent polymer element 12 is advantageous for incorporating the element 12 when the substrate 11 is thin.

Moreover, when acrylic resin is used for the element body 13 of the fluorescent polymer element 12, the specific gravity of the fluorescent polymer element 12 is close to that of the pulp fiber 70, so that the pulp fiber 70 and the fluorescent polymer element 12 are in a pulp solution. In the interior of the fluorescent polymer element 1, the surface of the acrylic resin (the surface of the fluorescent polymer element 12) is well mixed, and innumerable small protrusions are swelled up when viewed under a microscope.
The entanglement between 2 and the pulp fiber 70 becomes extremely strong. In addition, in the case of the conventional metal wire, since the wire tends to accumulate under the pulp solution, it is difficult to mix with the pulp fiber. Further, since the surface of the conventional metal wire is smooth, it has a poor bite to the pulp fiber.

The fluorescent polymer element 12 shown in FIG.
As described above, the outside of the element 12 may be covered with the coating layer 85 over the entire circumference. As the coating layer 85, one having a color similar to that of the pulp fiber 70 and transmitting part or all of the excitation light and the emitted light of the fluorescent pigment 14 may be used.

The fluorescent polymer element 12 provided with the coating layer 85 as described above, as shown in FIG. 13, is an acrylic resin mixed with the fluorescent pigment 14 by an acrylic solution supply section 91 using a nozzle 90 having a double structure. It is manufactured by wrapping the outside of the solution 80 with the polymer solution 92 for the coating layer 85 and passing it through the coagulation solution 78 (see FIG. 10).

The length of the fluorescent polymer element 12 is 2 mm.
The range from 1 to 10 mm is preferred. If it is less than 2 mm, the elements 12 become too fine and are evenly dispersed in the base material 11 like powder. Therefore, in the current processing apparatus 20, the output becomes uniform and it is difficult for random characteristics to appear. When the length of the element 12 exceeds 10 mm, the element 12 becomes difficult to mix with the pulp fiber 70 in the pulp solution, and it is difficult to pour the fluorescent polymer element 12 in the current papermaking technology.

The present invention also relates to the object to be detected 10 shown in FIG.
Like the fluorescent polymer element 12 or the substrate (paper) 11
In order to improve the durability of the base material (paper) 11, the entire surface or a part of one side of the base material (paper) 11 may be covered with the protective layer 95. The protective layer 95 is made of a material that transmits part or all of the excitation light and the emitted light of the fluorescent pigment 14 in the fluorescent polymer element 12.

Alternatively, in order to improve the durability and the like of the fluorescent polymer element 12 or the base material (paper) 11 like the detection object 10 shown in FIG. The part may be covered with the protective layer 95. This protective layer 95 is also made of a material that transmits part or all of the excitation light and the emitted light of the fluorescent pigment 14 in the fluorescent polymer element 12.

According to the present invention, the fluorescent polymer element 12 is embedded on the back surface of the canvas of the painting, and the code code corresponding to the element 12 is recorded on the code display portion provided at an appropriate position, so that the painting is displayed. It can also be used as proof of authenticity. Further, the present invention is useful for distinguishing the imitation from the authentic one by embedding the fluorescent polymer element 12 in a three-dimensional object such as a work of art.

[0045]

EFFECTS OF THE INVENTION According to the present invention, even if the object to be detected is bent, there is no problem such as the element protruding or breaking on the surface of the object to be detected, and a good surface suitable for printing or coloring. The state is obtained, and there is no problem that the distribution pattern of the element changes. Further, it is possible to avoid the occurrence of rust. Since the present invention optically detects the fluorescent polymer element mixed in the scanning region, the generation of noise from the device is avoided and the SN ratio is high as compared with the checking means using microwaves.
Further, since the scanning area is optically detected, there is no possibility of affecting the recorded contents of the code display section when the encryption code is magnetically recorded on the code display section.

When the above-mentioned fluorescent polymer element is rubbed together with the pulp fiber of the paper, the pulp fiber and the fluorescent polymer element are sufficiently entangled three-dimensionally, so that the integrity of the fluorescent polymer element and the substrate is high. Things are obtained. in this case,
It is possible to avoid defects such as the fluorescent polymer element moving in the base material, peeling off, and rustling on the surface of the base material, and it becomes a detection object with high durability and security. In addition, it is possible to cut into a predetermined size, print or write with a writing instrument such as a pen, and an object to be detected having a wide range of applications can be obtained.

In the present invention, the fluorescent pigment powder or the like is mixed in a polymer solution such as acrylic resin, and the fluorescent pigment mixed solution itself is drawn out from a nozzle or the like to obtain a fluorescent polymer element. Since the material is kneaded into the polymer material, the volume ratio of the fluorescent pigment to the element body can be made extremely high. Therefore, the output of emitted light (fluorescent light) is large and the S / N ratio is high. Moreover, since a fluorescent pigment can be physically mixed, unlike the case of a dye, it is possible to use all kinds of fluorescent pigments and obtain an arbitrary fluorescent color. Further, the fluorescent pigment can be effectively used without waste during manufacturing.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a fluorescent polymer element used for an object to be detected according to an embodiment of the present invention.

FIG. 2 is a plan view conceptually showing an example of an object to be detected.

FIG. 3 is a sectional view showing an outline of an apparatus for manufacturing the fluorescent polymer device shown in FIG.

FIG. 4 is a side view showing a partial cross-section of a processing apparatus showing an embodiment of the present invention.

5 is a schematic view of the optical detection means of the processing apparatus shown in FIG.

FIG. 6 is a flowchart showing steps of processing when creating an object to be detected.

FIG. 7 is a flowchart showing steps of a process for collating an object to be detected.

FIG. 8 is a cross-sectional view showing another embodiment of a fluorescent polymer element used for an object to be detected.

FIG. 9 is an enlarged view of a part of an object to be detected when the fluorescent polymer element is scratched into the paper.

FIG. 10 is a sectional view showing an example of an apparatus for manufacturing a fluorescent polymer element using acrylic.

FIG. 11 is an enlarged cross-sectional view showing a part of the device shown in FIG.

FIG. 12 is a cross-sectional view when a coating layer is provided on the fluorescent polymer element.

13 is a sectional view showing a part of an apparatus for manufacturing the fluorescent polymer device shown in FIG.

FIG. 14 is a cross-sectional view of an object to be detected having a protective layer on one surface.

FIG. 15 is a cross-sectional view of an object to be detected having protective layers on both sides.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Detected object 11 ... Base material 12 ... Fluorescent polymer element 13 ... Element main body 14 ... Fluorescent pigment 17 ... Scanning area 18 ... Code display section 20 ... Processing device 30 ... Optical detection means 32 ... Light emitting element 42 ... Light receiving element 50 ... controller 51 ... code writing section 52 ... code reading section 70 ... pulp fiber 85 ... coating layer 95 ... protective layer

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location G06K 19/10 G07D 7/00 E

Claims (8)

[Claims] 1. A substrate made of a non-fluorescent material, a scanning region provided at a specific position of the substrate, and an element randomly mixed in the scanning region so as to face an unspecified number of directions. And a large number of fluorescent polymer elements containing a fluorescent pigment in a flexible element body made of a polymer material, and a unique element that is provided in a part of the base material and is obtained according to the fluorescent polymer elements in the scanning region. And a code display section in which information corresponding to the output of the above is coded and recorded. 2. The powder of the fluorescent pigment, wherein the fluorescent pigment is optically free of an absorption region in the visible light region.
The object to be detected according to. 3. The object to be detected according to claim 1, wherein the base material is paper, and the fluorescent polymer element is embedded in the base material together with pulp fibers of the paper. . 4. The object to be detected according to claim 3, wherein the polymer material of the element body of the fluorescent polymer element is acrylic resin. 5. The outer surface of the fluorescent polymer element is entirely covered with a coating layer that transmits a part or all of the excitation light and the emitted light of the fluorescent pigment. Detected object. 6. A part or the whole surface of the paper in which the fluorescent polymer element is incorporated is covered with a protective layer which transmits part or all of the excitation light and the emitted light of the fluorescent pigment. The object to be detected according to claim 3. 7. A substrate having a base material made of a non-fluorescent material, a large number of fluorescent polymer elements in which an element body made of a polymeric material contains a fluorescent pigment, and a scanning region in which the fluorescent polymer elements are randomly mixed. A method for checking the authenticity of a detected object, comprising a creating process for creating the detected object, and a matching process for checking the detected object, the creating process comprising: Scanning step for optically scanning the fluorescent polymer element in the region, and detection step for obtaining a detection signal specific to this detected object by capturing the output that changes according to the distribution of the fluorescent polymer element when scanning the scanning region And a step of obtaining an encryption code by encrypting the detection signal, and a step of recording the encryption code on the code display portion of the detected object. The matching process is unique to the detected object by capturing a scanning step of optically scanning the fluorescent polymer element in the scanning area and an output that changes according to the distribution of the fluorescent polymer element when scanning the scanning area. Detection step for obtaining the detection signal of the above, a code reading step for reading the code code recorded on the code display section, and the detected object is authentic when the code code corresponds to the detection signal detected in the detection step. A method for checking the authenticity of an object to be detected, comprising the step of determining that 8. A substrate comprising a non-fluorescent material, a large number of fluorescent polymer elements in which an element body made of a polymeric material contains a fluorescent pigment, and a scanning region in which the fluorescent polymer elements are randomly mixed. A device for checking the authenticity of an object to be detected, which is unique to the object to be detected by optically scanning the fluorescent polymer element in the scanning region and capturing an output which changes according to the distribution of the fluorescent polymer element. Optical detection means for obtaining the detection signal, means for obtaining the encryption code by encrypting the detection signal, code writing means for recording the encryption code in the code display portion of the detected object, and the code display portion Reading means for reading the encryption code recorded in,
The method further comprises means for collating the encryption code read by the reading means with the detection signal detected by the detecting means and determining that the detected object is authentic when the two correspond to each other. A device for checking the authenticity of an object to be detected.