Manufacturing method of forgery-preventing device using demagnetization and forgery-preventing device manufactured thereby

Abstract

The present invention relates to a forgery-preventing alteration-preventing device using demagnetization, characterized by comprising: a weak magnetic body base material; and a hidden mark formed in a demagnetization manner on the surface of the weak magnetic body base material. The hidden mark is formed in a manner that a magnetic force present on the surface of the weak magnetic body base material is eliminated by a strong magnetic body printing device contacting or approaching the surface of the weak magnetic body base material.

Description

[Technical Field]

[0001] This invention relates to a method for manufacturing an anti-counterfeiting alteration device utilizing demagnetization, and to an anti-counterfeiting alteration device manufactured therefrom. [Background Technology]

[0002] In the field of product authentication, holograms and QR codes are easy to copy due to their low difficulty, while NFC (Near Field Communication), RFID (Radio Frequency Identification), and Dot-code are difficult to apply to ordinary food or cosmetics due to their high cost. Therefore, there is still a need for a new technology to solve both the technical difficulties and cost issues.

[0003] Existing technologies typically involve printing anti-counterfeiting and alteration inks, which can be verified by specific methods (magnetism, light, humidity, pressure, temperature, etc.), onto the surface of a substrate to form hidden marks that cannot be detected by the naked eye. Commonly used anti-counterfeiting and alteration inks include fluorescent ink, phosphorescent ink, thermochromic ink, photochromic ink, optically variable ink, magnetic ink, and liquid crystal.

[0004] One type of anti-counterfeiting device using magnetic ink involves creating a hidden mark on a specific object by having parts of the object with and parts of the object without a magnetic field coexist, or by having parts of the object with a strong magnetic field coexist with parts of the object with a weak magnetic field. The shape of the magnetic field applied to the object is then confirmed by a magnetic viewer.

[0005] Existing anti-counterfeiting devices that utilize magnetic authentication typically form hidden marks by using electromagnetic force to create magnetic patterns. One example is the method of coating one side of a substrate with magnetic ink, forming a magnetic pattern using a clamp that generates magnetic force, and then drying it.

[0006] This method has the disadvantage of not being able to freely form hidden marks due to the complexity of the device, the excessive energy requirements, and the need to use magnetized coils with a fixed shape on the system.

[0007] Moreover, due to the complexity of the process, various supplementary devices are required to address operational errors, thus the problems of insufficient economic efficiency, mass production, and freedom of operation still exist.

[0008] On the other hand, demagnetizing devices are devices that eliminate the fine residual magnetism present in products. They are used as a finishing process after the processing of electronic equipment or metal structures. Research and development on demagnetizing devices that can increase demagnetizing efficiency has been ongoing, but so far no anti-counterfeiting device using demagnetizing has been developed. [Summary of the Invention]

[0009] [Technical Issues]

[0010] The purpose of this invention is to easily form hidden marks on anti-counterfeiting devices by using a strong magnetic printing device on the surface of a weak magnetic substrate in a demagnetizing manner.

[0011] The purpose of this invention is to provide an anti-counterfeiting device that is difficult to forge.

[0012] The purpose of this invention is to provide an anti-counterfeiting and alteration device with low manufacturing cost.

[0013] The purpose of this invention is to provide an anti-counterfeiting device that can identify counterfeits without the need for other counterfeit verification devices.

[0014] [Technical Solution]

[0015] This invention provides an anti-counterfeiting and anti-tampering device.

[0016] The inventors of this invention have made every effort to develop an anti-counterfeiting device that is not only difficult to counterfeit, easy to manufacture, and low in cost, but also can identify counterfeits without the need for other counterfeiting verification devices. Their results show that by creating an anti-counterfeiting device using a hidden mark printed on the surface of a weakly magnetic substrate using a strong magnetic printing device in a demagnetizing manner, the device can easily confirm whether it is counterfeit using a magnetic viewer. Furthermore, counterfeits are difficult to counterfeit, the device is easy to manufacture, the cost is low, and it can identify counterfeits without the need for other complex counterfeiting verification devices.

[0017] According to a preferred embodiment of the present invention, the present invention provides an anti-counterfeiting device utilizing demagnetization, comprising a weakly magnetic substrate; and a hidden mark printed on the surface of the weakly magnetic substrate by a demagnetization method; the hidden mark is printed by bringing a strong magnetic printing device into contact with or close to the surface of the weakly magnetic substrate to eliminate the magnetic force present on the surface of the weakly magnetic material.

[0018] The terms "strong magnetic body" and "weak magnetic body" used in this specification are relative concepts, referring to a magnetic body with a relatively stronger magnetic force among two magnetic bodies.

[0019] The magnetic viewer used in this manual refers to any device that allows the naked eye to confirm whether a magnetic force is present.

[0020] The term "pseudo-alteration" as used in this manual refers to any act by an unauthorized person to create a new item that does not currently exist for the purpose of use, or any act of modifying an existing item without authorization.

[0021] In this invention, the inclusion of hidden marks printed using a demagnetizing method on the surface of the weakly magnetic substrate is a crucial structure. This is because the printing apparatus for printing hidden marks using a demagnetizing method on the surface of the weakly magnetic substrate has significantly lower manufacturing costs compared to a printing apparatus that applies magnetic force to print hidden marks on a substrate without an applied magnetic field.

[0022] According to a preferred embodiment of the present invention, the weakly magnetic substrate of the present invention is preferably a rubber magnet or a paper magnet.

[0023] According to a preferred embodiment of the present invention, the hidden mark of the present invention can preferably be identified using a magnetic viewer.

[0024] According to a preferred embodiment of the present invention, the magnetic viewer of the present invention is preferably formed by bonding it to a magnetic viewer joint portion extending from one side of the anti-counterfeiting alteration device.

[0025] In this invention, the magnetic viewer, extending from one side of the anti-counterfeiting device, is joined to a magnetic viewer connector, which is a crucial structural element. Because by joining the magnetic viewer to this connector, the shape of the hidden mark can be easily and conveniently confirmed by folding the magnetic viewer towards the weakly magnetic substrate.

[0026] According to a preferred embodiment of the present invention, the magnetic viewer coupled with the magnetic viewer joint of the present invention is preferably folded toward the anti-counterfeiting alteration device to confirm whether it has been counterfeited or altered.

[0027] According to a preferred embodiment of the present invention, the middle portion of the magnetic viewer connector of the present invention preferably has a through hole for confirming whether it is counterfeit or not, and its edge preferably has a connecting device that can be connected with the magnetic viewer.

[0028] According to a preferred embodiment of the present invention, an adhesive layer is preferably formed on the bottom surface of the weak magnetic substrate and the bottom surface of the edge, and a release paper layer is preferably formed under the adhesive layer.

[0029] According to a preferred embodiment of the present invention, a handle portion preferably extends to one side of the edge of the present invention, and the bottom surface of the handle portion is preferably not formed with an adhesive layer.

[0030] According to a preferred embodiment of the present invention, the adhesive force of the adhesive layer formed on the bottom surface of the weak magnetic substrate is preferably stronger than that of the adhesive layer formed on the bottom surface of the edge.

[0031] In this invention, it is crucial that the adhesive layer formed on the bottom surface of the weakly magnetic substrate has a stronger adhesive force than the adhesive layer formed on the bottom edge surface. This is because if the adhesive layer on the bottom surface of the weakly magnetic substrate has a stronger adhesive force than the adhesive layer formed on the bottom edge surface, then after easily separating the magnetic viewer connector from the adhesive surface, the shape of the hidden mark can be easily confirmed by folding the magnetic viewer connector towards the weakly magnetic substrate.

[0032] According to a preferred embodiment of the present invention, the strongly magnetic printing apparatus of the present invention preferably includes a main body and a printing head, and can generate the hidden mark by means of a permanent magnet or an electromagnet.

[0033] According to a preferred embodiment of the present invention, the hidden mark is formed by the demagnetization of at least two areas on the surface of the weakly magnetic substrate by the strong magnetic body printing device, such that the magnetic force is eliminated to different degrees in each area.

[0034] According to a preferred embodiment of the present invention, the magnetic printing apparatus can be configured such that the magnetic force can be adjusted during the formation of the hidden mark.

[0035] According to a preferred embodiment of the present invention, the strong magnetic body printing apparatus may include a first strong magnetic body printing apparatus and a second strong magnetic body printing apparatus with a weaker magnetic force than the first strong magnetic body printing apparatus.

[0036] According to a preferred embodiment of the present invention, the hidden mark is a first hidden mark printed by magnetization, and may also include a second hidden mark whose color changes when a magnetic field is applied.

[0037] According to a preferred embodiment of the present invention, the strongly magnetic body printing device for forming the first hidden mark and the magnetizer for forming the second hidden mark are formed by moving on one side of the weakly magnetic body substrate according to an input pattern.

[0038] According to a preferred embodiment of the present invention, the hidden mark is a first hidden mark; it further includes: a second hidden mark formed by applying a magnetic field to photonic crystal particles whose arrangement and spacing are adjusted by an externally applied magnetic field; the second hidden mark is a magnetic pattern containing at least one of hidden colors and shapes that is exposed during magnetic verification; the second hidden mark is formed on at least a portion of the area where the magnetic force is eliminated by the strong magnetic printing device.

[0039] According to other embodiments of the present invention, the present invention provides a method for manufacturing an anti-counterfeiting device utilizing demagnetization, comprising: (a) preparing a weakly magnetic substrate and a strongly magnetic printing apparatus; and (b) printing a hidden mark on the surface of the weakly magnetic substrate of step (a) in a demagnetizing manner. The hidden mark is printed by contacting or bringing the strongly magnetic printing apparatus close to the surface of the weakly magnetic substrate to eliminate the magnetic force present on the surface of the weakly magnetic substrate.

[0040] According to a preferred embodiment of the present invention, the strongly magnetic printing device that forms the hidden mark is to move along one side of the weakly magnetic substrate to form the hidden mark according to an input pattern.

[0041] The method for manufacturing an anti-counterfeiting alteration device using demagnetization described in this manual is similar to the aforementioned anti-counterfeiting alteration device using demagnetization, and will not be elaborated further to avoid making this manual overly complicated.

[0042] [Beneficial Effects]

[0043] The beneficial effect of the present invention is that hidden marks can be easily printed on the anti-counterfeiting device by using a strong magnetic printing device on the surface of a weak magnetic substrate in a demagnetizing manner.

[0044] The beneficial effect of this invention is that it provides an anti-counterfeiting device that is difficult to forge.

[0045] The beneficial effect of this invention is that it provides an anti-counterfeiting and alteration device with low manufacturing cost.

[0046] The beneficial effect of the present invention is that it provides an anti-counterfeiting device that can identify counterfeits without the need for other counterfeit verification devices. [Attached Image Description]

[0047] Figure 1 It displays the status of hidden markings contained in the anti-counterfeiting device using demagnetized printing;

[0048] Figure 2 These are a front view and a cross-sectional view showing the anti-counterfeiting device using demagnetization according to the present invention;

[0049] Figure 3It displays the status of hidden markers identified using a magnetic viewer;

[0050] Figure 4 This is a front view and a cross-sectional view showing the present invention, namely, the anti-counterfeiting and alteration device (magnetic viewer integrated type) utilizing demagnetization.

[0051] Figure 5 It displays the status of hidden markers identified using a magnetic viewer (magnetic viewer integrated type);

[0052] Figure 6 When a weakly magnetic material, magnetized into a stripe pattern, has hidden markings printed on it, a magnetic viewer is used to identify the state of the hidden markings.

[0053] Figure 7 This is an illustration of a second embodiment of the anti-counterfeiting and alteration device utilizing demagnetization according to the present invention;

[0054] Figure 8 This is an illustration of a third embodiment of the anti-counterfeiting and alteration device utilizing demagnetization according to the present invention;

[0055] Figure 9 This is an illustration of a fourth embodiment of the present invention, which utilizes demagnetization to prevent counterfeiting and alteration.

[0056] [Symbol Explanation]

[0057] 10: Weakly magnetic substrate; 20: Hidden markings;

[0058] 23: First hidden marker; 24: Second hidden marker;

[0059] 30: Strong magnetic material printing device; 31: Main body;

[0060] 32: Printed head; 40: Magnetic viewer;

[0061] 50: Magnetic viewer joint; 51: Through hole;

[0062] 52: Edge; 53: Connecting device;

[0063] 60: Adhesive layer; 70: Release paper layer;

[0064] 80: Handle; 100: Anti-counterfeiting device.

Detailed Implementation Methods

[0065] The following description, in conjunction with the accompanying drawings, details specific embodiments of the present invention. However, these described embodiments represent only a portion, not all, of the embodiments. Based on the embodiments of the present invention, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features; such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Furthermore, when describing the present invention, if the specific description of relevant known technologies obscures the key points of the present invention, such description will be omitted.

[0066] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0067] Figures 1 to 6 The figure shows the printing state of the hidden mark included in the anti-counterfeiting alteration device 100 using demagnetization according to an embodiment of the present invention, a front view and a perspective view of the anti-counterfeiting alteration device 100 using demagnetization, and the state of identifying the hidden mark 20 using a magnetic viewer 40.

[0068] according to Figures 1 to 5 An embodiment of the present invention provides an anti-counterfeiting alteration device 100 utilizing demagnetization, comprising a weakly magnetic substrate 10, a hidden mark 20, a strong magnetic printing device 30 including a main body 31 and a printing head 32, a magnetic viewer 40, a magnetic viewer connecting part 50 including a through hole 51, an edge 52 and a connecting device 53, an adhesive layer 60, a release paper layer 70, and a handle part 80.

[0069] according to Figure 1 and Figure 2 The weak magnetic substrate 10 is preferably made of rubber magnet or paper magnet, but is not limited thereto, and can be made of different kinds of weak magnetic sheet substrates used in the art.

[0070] In addition to the hidden mark 20 printed using the strong magnetic printing device 30, the weak magnetic substrate 10 may also include a printing layer printed using ordinary ink.

[0071] The hidden mark 20 is printed on the weakly magnetic substrate 10, but its shape can only be identified by a magnetic viewer 40. The hidden mark 20 is printed by a strong magnetic printing device 30. Normally, when a strong magnetic material of a certain level or higher is applied to the weakly magnetic substrate, the area where the strong magnetic material is applied tends to lose its magnetic force. In this state, when the weakly magnetic substrate with the applied strong magnetic material is viewed through the magnetic viewer 40, the color of the area with the applied strong magnetic material can be seen to change to another color.

[0072] according to Figure 6Generally, weakly magnetic substrates are magnetized into a striped pattern. Here, on a weakly magnetic substrate magnetized into a striped pattern, after demagnetization with a strong magnetic material, when the weakly magnetic substrate is viewed with a magnetic viewer, the stripes can be seen in the remaining area, except for the hidden markings.

[0073] On the other hand, weakly magnetic sheets can also be magnetized into stripes, grids, or other patterns, or into surface textures.

[0074] The strong magnetic printing apparatus 30 includes a main body 31 and a printing head 32. The main body 31 and the printing head 32 can be made using various magnets that can generate strong magnetic forces, such as neodymium magnets and electromagnets.

[0075] Here, the printing head 32 is designed to have a pointed end for printing precise shapes.

[0076] according to Figure 3 The magnetic viewer 40 can be made of translucent synthetic resin to confirm the hidden mark 20 printed using the strong magnetic printing device 30. The hidden mark 20 can be set separately for confirmation, but as... Figure 4 and Figure 5 As shown, preferably, the magnetic viewer 40 is integrated into the anti-counterfeiting alteration device.

[0077] The magnetic viewer junction 50 includes a through hole 51, an edge 52, and a junction device 53.

[0078] The magnetic viewer connector 50 is formed extending outward from one end of the weakly magnetic substrate 10, with the magnetic viewer 40 attached to its middle portion. A groove can be formed at the boundary between the magnetic viewer connector 50 and the weakly magnetic substrate 10 to fold the magnetic viewer connector 50 toward the weakly magnetic substrate 10.

[0079] The magnetic viewer connection part 50 has a quadrilateral through hole 51 in the middle part, and a magnetic viewer 40 is connected to the through hole 51. The magnetic viewer 40 is connected to a connection device 53 located around the through hole 51.

[0080] The edge 52 refers to the portion of the magnetic viewer connector 50 other than the through hole 51. A handle portion 80 extends from one side of the edge 52, which is required to fold the magnetic viewer connector 50 toward the weak magnetic substrate 10.

[0081] The adhesive layer 60 is formed on the bottom surface of the weak magnetic substrate 10 and the bottom surface of the edge 52, and can serve to stick the bottom surface and edge 52 of the weak magnetic substrate 10 to the object.

[0082] Here, the adhesive layer 60 formed on the bottom surface of the weakly magnetic substrate 10 has a stronger adhesive force than the adhesive layer 60 provided on the bottom surface of the edge 52. If the adhesive layer 60 formed on the bottom surface of the weakly magnetic substrate 10 has a stronger adhesive force than the adhesive layer 60 formed on the bottom surface of the edge 52, the magnetic viewer joint 50 can be easily separated from the bonded object and folded toward the weakly magnetic substrate 10 to confirm whether it is a counterfeit.

[0083] The release paper layer 70 can be made of paper, synthetic resin, metal sheet or composite material, and is bonded to the bottom of the adhesive layer 60 to prevent the bottom surface of the adhesive layer 60 from being contaminated by foreign matter, which would reduce the adhesion.

[0084] Then according to Figure 7 The present invention describes a second embodiment of an anti-counterfeiting and alteration device utilizing demagnetization and its manufacturing method.

[0085] In a further embodiment described above, the hidden mark 20 is formed by eliminating the magnetic forces in at least two regions 21 and 22 on the surface of the weakly magnetic substrate 10 to varying degrees, thereby creating a magnetic pattern.

[0086] Furthermore, in part 21, the lower substrate surface color is directly visible because more magnetic force is eliminated, while in other parts 22, the magnetic force is relatively less eliminated compared to the first hidden mark 23, so the lower substrate surface color is less visible.

[0087] Therefore, by simply demagnetizing, various chromaticities can be achieved during authentication in the same hidden marker 20, thereby achieving a superior effect that can further improve security.

[0088] According to this embodiment, the strong magnetic body printing device 30 can be configured with a variable electromagnet with adjustable magnetic force during the formation of the hidden mark. According to the input pattern, it moves forward, backward, left and right together with the inkjet printer on one side of the weak magnetic body substrate, while the magnetic force changes, and the hidden mark 20 is formed.

[0089] Then, Figure 8 This is the third embodiment of the anti-counterfeiting device and manufacturing method of the present invention using demagnetization. According to an example shown in the figure, the difference from the second embodiment described above is that a first strong magnetic body printing device 31 and a second strong magnetic body printing device 32 with a magnetic force weaker than the first strong magnetic body printing device 31 are used to simultaneously form areas with different degrees of magnetic force elimination.

[0090] Compared to the above-described method using a variable electromagnet, this embodiment has the advantage of being able to form hidden markers more quickly.

[0091] Then, Figure 9 This is a fourth embodiment of the anti-counterfeiting and alteration device and its manufacturing method using demagnetization. The illustration shows an example of the first hidden mark 23 being formed by demagnetization and the second hidden mark 24 being formed by magnetization.

[0092] Furthermore, as a method of printing hidden marks on a weakly magnetic substrate 10 by using both demagnetization and magnetization, the part of the existing weakly magnetic substrate 10 surface that requires ordinary hidden marks is simply formed by demagnetization of the first hidden mark 23. If a special code or authentication pattern needs to be added, a second hidden mark 24 can be added by magnetization.

[0093] This method allows for demagnetization followed by magnetization, or vice versa, or simultaneous demagnetization and magnetization, to print the required hidden markings, thereby further enhancing the security of the anti-counterfeiting device.

[0094] On the other hand, the strong magnetic printing device 30 that forms the first hidden mark 23 and the magnetizer (not shown) that forms the second hidden mark can move back and forth and left and right together with the inkjet printer to form the hidden mark according to the input pattern on one side of the weak magnetic substrate 10.

[0095] On the other hand, the second hidden mark 24 is formed by applying a magnetic field to photonic crystal particles whose arrangement and spacing are adjusted by an externally applied magnetic field, and is formed on at least a portion of the region where the magnetic force is eliminated by the strongly magnetic printing device.

[0096] Furthermore, the second hidden mark is revealed when a certain arrangement and spacing are formed between photonic crystal particles by an external magnetic field, and during magnetic verification, a magnetic pattern containing at least one of the hidden color and shape is exposed.

[0097] Therefore, depending on the requirements, ink containing photonic crystal particles is printed after demagnetization, and a second hidden mark with a different color and shape from the first hidden mark further enhances the security of the anti-counterfeiting device.

[0098] The effects of the present invention are not limited to those described in this specification. Other different effects can be achieved through the various structures described above. Based on the organic combination relationship between the various structures described above, new effects that cannot be achieved in the prior art can be obtained.

[0099] Meanwhile, the embodiments illustrated in the figure can be modified to other forms, and the structures or equivalent substitutions within the scope of the claims of this invention can be applied. However, all embodiments made without creative effort are within the protection scope of this invention.

Claims

1. A counterfeit-proof and alteration device utilizing demagnetization, characterized in that, include: Weakly magnetic substrate; And hidden markings formed on the surface of the weakly magnetic substrate by demagnetization; The hidden mark is formed by contacting or approaching the surface of the weakly magnetic substrate with a strong magnetic printing device to eliminate the magnetic force present on the surface of the weakly magnetic substrate. The strong magnetic printing device includes a main body and a printing head, and applies ferromagnetism with a permanent magnet or electromagnet to print the hidden mark.

2. The anti-counterfeiting and alteration device utilizing demagnetization according to claim 1, characterized in that, The weakly magnetic substrate is a rubber magnet or a paper magnet.

3. The anti-counterfeiting and alteration device utilizing demagnetization according to claim 2, characterized in that, The hidden markers were identified using a magnetic viewer.

4. The anti-counterfeiting and alteration device utilizing demagnetization according to claim 3, characterized in that, The magnetic viewer is attached to a magnetic viewer joint that extends from one side of the anti-counterfeiting alteration device.

5. The anti-counterfeiting and alteration device utilizing demagnetization according to claim 4, characterized in that, The magnetic viewer confirms whether the device has been forged or not when it is folded towards the anti-counterfeiting device.

6. The anti-counterfeiting and alteration device utilizing demagnetization according to claim 5, characterized in that, The middle part of the magnetic viewer joint is provided with a through hole for confirming whether it is a forgery or not.

7. The anti-counterfeiting and alteration device utilizing demagnetization according to claim 6, characterized in that, The edge of the magnetic viewer connector is provided with a connecting device that can be connected to the magnetic viewer. The edge refers to the part of the magnetic viewer connector other than the through hole.

8. The anti-counterfeiting and alteration device utilizing demagnetization according to claim 7, characterized in that, An adhesive layer is provided on the bottom surface of the weak magnetic substrate and the bottom surface of the edge, and a release paper layer is provided below the adhesive layer.

9. The anti-counterfeiting and alteration device utilizing demagnetization according to claim 8, characterized in that, A handle extends from one side of the edge, and no adhesive layer is formed on the bottom surface of the handle.

10. The anti-counterfeiting and alteration device utilizing demagnetization according to claim 8, characterized in that, The adhesive layer formed on the bottom surface of the weakly magnetic substrate has a stronger adhesive force than the adhesive layer formed on the bottom surface of the edge.

11. The anti-counterfeiting and alteration device utilizing demagnetization according to claim 1, characterized in that, The hidden marking is formed by eliminating the magnetic force to varying degrees in at least two or more areas on the surface of the weakly magnetic substrate by means of the strong magnetic body printing device.

12. The anti-counterfeiting and alteration device utilizing demagnetization according to claim 11, characterized in that, The magnetic printing device is configured such that the magnetic force can be adjusted during the formation of the hidden mark.

13. The anti-counterfeiting and alteration device utilizing demagnetization according to claim 11, characterized in that, The strong magnetic material printing apparatus includes: a first strong magnetic material printing apparatus; and a second strong magnetic material printing apparatus with a weaker magnetic force than the first strong magnetic material printing apparatus.

14. The anti-counterfeiting and alteration device utilizing demagnetization according to claim 1, characterized in that, The hidden mark is a first hidden mark, and also includes a second hidden mark that is printed in a magnetized manner and whose color changes when a magnetic field is applied.

15. The anti-counterfeiting and alteration device utilizing demagnetization according to claim 14, characterized in that, The strongly magnetic printing device that forms the first hidden mark and the magnetizer that forms the second hidden mark move along one side of the weakly magnetic substrate to form the hidden mark according to the input pattern.

16. The anti-counterfeiting and alteration device utilizing demagnetization according to claim 1, characterized in that, The hidden mark is a first hidden mark; it also includes: a second hidden mark formed by applying a magnetic field to photonic crystal particles arranged and spaced by an externally applied magnetic field; the second hidden mark is a magnetic pattern containing at least one of hidden colors and shapes that is exposed during magnetic verification; the second hidden mark is formed on at least a portion of the area where the magnetic force is eliminated by the strong magnetic printing device.

17. A method for manufacturing an anti-counterfeiting and alteration device utilizing demagnetization, characterized in that, include: (a) Steps for preparing a weakly magnetic substrate and a strong magnetic printing apparatus; and (b) the step of printing a hidden mark on the surface of the weakly magnetic substrate in step (a) by demagnetizing it; the hidden mark is printed by contacting or bringing a strong magnetic printing device close to the surface of the weakly magnetic substrate to eliminate the magnetic force present on the surface of the weakly magnetic substrate, the strong magnetic printing device including a body and a printing head, and printing the hidden mark by applying ferromagnetism with a permanent magnet or electromagnet.

18. The method for manufacturing the anti-counterfeiting and alteration device utilizing demagnetization according to claim 17, characterized in that, The strongly magnetic printing apparatus that forms the hidden mark moves along one side of the weakly magnetic substrate according to the input pattern to form the hidden mark.

Images