Codable surface optical anti-counterfeiting method of radio frequency chip

Abstract

The embodiment of the invention relates to the technical field of radio frequency chip anti-counterfeiting, in particular to a coding surface optical anti-counterfeiting method of a radio frequency chip. The method comprises the following steps at a processing end: calculating a binary phase diagram by utilizing an iterative Fourier algorithm according to anti-counterfeiting coding information, and further performing dot matrix calculation to obtain a binary dot matrix diagram required by laser processing; and processing the anti-counterfeiting dot matrix on the surface of the chip to be processed by adopting a laser direct writing mode according to the binary dot matrix diagram. The method comprises the following steps at a detection end: observing whether an anti-counterfeiting dot matrix of a to-be-detected chip has a variable structural color or not; if the to-be-detected chip is observed, fixing the to-be-detected chip at the detection laser irradiation position of the detection device; starting the detection device to enable the detection laser to cover the to-be-detected chip so as to obtain a diffraction image; reading the image coding information, and comparing the image coding information with the anti-counterfeiting coding information; and if the two are consistent, judging that the to-be-detected chip is true. According to the method, independent coding anti-counterfeiting is realized, the reading mode is simple and convenient, and identification is easy.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of radio frequency chip anti-counterfeiting, and in particular to an optical anti-counterfeiting method for a codable surface of a radio frequency chip. Background Art

[0002] Radio frequency chips are increasingly used in daily life, especially in identity card security. With the development of digital encryption technology, the anti-counterfeiting and anti-tampering capabilities of radio frequency chips have been greatly enhanced. However, there are still criminals who deliberately disguise counterfeit chips without information as naturally damaged chips to evade the authentication of radio frequency reading equipment, making the card to be identified lose an important anti-counterfeiting authentication method, increasing the risk of counterfeit cards being effective.

[0003] It can be seen that the anti-counterfeiting function of RF chips is mostly realized based on digital data encryption technology, lacking the anti-counterfeiting features of physical structure. In the special case where the information stored inside the chip cannot be read, the ability to identify the authenticity of the chip is lost.

[0004] Some physical anti-counterfeiting methods that have been proposed so far provide additional visual physical anti-counterfeiting structures by printing holographic patterns, fluorescent markers or color-changing ink labels on the chip surface. However, these solutions are still traditional card anti-counterfeiting methods in essence, with limited anti-counterfeiting protection for the chip itself, and are limited by traditional holographic label production methods and printing processes, making it extremely difficult to achieve coded custom anti-counterfeiting for each chip.

[0005] The Chinese invention patent with publication number CN113763801A proposes an anti-counterfeiting structure, a method for preparing the anti-counterfeiting structure and a chip. It uses a structural color anti-counterfeiting structure based on the Mie resonance phenomenon and adopts electron beam lithography technology to prepare a protrusion structure on a substrate. These protrusions can produce Mie resonance to the incident light, so that when the anti-counterfeiting structure is viewed from different angles, it will present different colors, thereby realizing the anti-counterfeiting function.

[0006] However, the inventors of the present application have found that the above method has a complex process, high cost, requires additional consumables, has the risk of environmental pollution when using chemical fluorescent color-changing materials, and is extremely difficult to achieve individually encodable anti-counterfeiting for each chip, that is, the anti-counterfeiting information of all chips is the same, and the flexibility is very low. Summary of the invention

[0007] In view of this, the embodiments of the present application propose an optical anti-counterfeiting method for the encodable surface of a radio frequency chip, which can solve the technical problems of the currently proposed physical anti-counterfeiting methods, such as the need for additional consumables, the risk of environmental pollution, poor flexibility, and the inability to encode individually. Each chip is individually processed by laser direct writing, which can achieve individual coding anti-counterfeiting, and the reading method is simple and easy to identify.

[0008] On the first aspect, an embodiment of the present application proposes a method for optical anti-counterfeiting of the encodable surface of a radio frequency chip, which is applied to the processing end. The method includes: calculating the corresponding binary phase map according to the preset anti-counterfeiting coding information using an iterative Fourier algorithm; performing dot matrix calculation based on the calculated binary phase map to obtain the binary dot matrix required for laser processing; performing separate laser processing on the chip to be processed by laser direct writing according to the calculated binary dot matrix, and processing the anti-counterfeiting dot matrix on the surface of the chip to be processed.

[0009] In some optional embodiments, according to the calculated binary dot matrix, a laser direct writing method is used to perform separate laser processing on the chip to be processed, and an anti-counterfeiting dot matrix is ​​processed on the surface of the chip to be processed. Specifically, according to the calculated binary dot matrix, a processing laser is used to irradiate the corresponding positions on the surface of the chip to be processed, and pits are ablated at the corresponding positions on the surface of the chip to be processed to form an anti-counterfeiting dot matrix; wherein, the detection laser is used by the detection end for anti-counterfeiting identification, and the depth of the pit is 0.25+k times the wavelength of the detection laser, and k is an integer greater than or equal to 0.

[0010] In some optional embodiments, the processing laser used at the processing end is an ultrafast light source, including picosecond pulse laser and femtosecond pulse laser, and the anti-counterfeiting dot matrix processed on the surface of the chip to be processed is a laser-induced periodic surface structure.

[0011] In some optional embodiments, according to the calculated binary dot matrix, the chip to be processed is individually laser processed by laser direct writing, and after the anti-counterfeiting dot matrix is ​​processed on the surface of the chip to be processed, it also includes: synchronizing the preset anti-counterfeiting coding information to the detection end.

[0012] Through the above method, the processing end can calculate the corresponding binary phase map according to the preset anti-counterfeiting coding information using the iterative Fourier algorithm, and then perform dot matrix calculation based on the calculated binary phase map to obtain the binary dot matrix required for laser processing. Finally, according to the calculated binary dot matrix, the laser direct writing method is used to perform separate laser processing on the chip to be processed, and an anti-counterfeiting dot matrix is ​​processed on the surface of the chip to be processed. The anti-counterfeiting dot matrix processed in this way is a physical anti-counterfeiting structure that actually exists on the surface of the chip, which cannot be transferred and is strong and reliable. The processing end performs separate processing for each chip to be processed, which can realize the separate coding anti-counterfeiting of each chip to be processed, does not rely on a fixed mask, and is very flexible. Laser processing has low thermal effect, high efficiency, no environmental pollution risk, and will not cause additional damage to the chip to be processed.

[0013] On the second aspect, an embodiment of the present application proposes a method for optical anti-counterfeiting of the encodable surface of a radio frequency chip, which is applied to a detection end, and the method includes: observing whether the anti-counterfeiting dot matrix of the chip to be detected has a variable structural color by changing the observation angle; if it is observed that the anti-counterfeiting dot matrix of the chip to be detected has no variable structural color, the chip to be detected is determined to be counterfeit; if it is observed that the anti-counterfeiting dot matrix of the chip to be detected has a variable structural color, the chip to be detected is fixed at the detection laser irradiation position of the detection device; the detection device is started so that the light spot of the detection laser covers the anti-counterfeiting dot matrix of the chip to be detected to obtain a diffraction image; the image coding information is read from the obtained diffraction image, and compared with the preset anti-counterfeiting coding information; if the read image coding information is consistent with the anti-counterfeiting coding information, the chip to be detected is determined to be authentic; if the read image coding information is inconsistent with the anti-counterfeiting coding information, the chip to be detected is determined to be counterfeit.

[0014] In some optional embodiments, the detection device is composed of a detection laser, a collimating beam expander, an aperture, a convex lens, a digital camera and a computer. The detection laser and the digital camera are aimed at the chip to be detected, the collimating beam expander is arranged on the optical path of the detection laser, the convex lens and the aperture are arranged on the optical path of the digital camera, and a connection is established between the digital camera and the computer.

[0015] In some optional embodiments, the detection laser emitted by the detection laser of the detection device is expanded and collimated by a collimating beam expander, and then irradiates the anti-counterfeiting dot matrix covering the entire chip to be detected. After being reflected by the chip to be detected, the stray light is filtered out by an aperture, and then processed by a convex lens to form a diffraction image on a digital camera. The digital camera transmits the diffraction image to a computer, and the computer reads the image coding information from the diffraction image and compares it with the preset anti-counterfeiting coding information.

[0016] Through the above method, the detection end can identify the authenticity of the chip to be detected from two levels. The first level starts from the variable structural color. After the laser processing at the processing end, the anti-counterfeiting dot matrix area of ​​the genuine chip will produce a variable structural color visible to the naked eye. The detection end changes the observation angle to observe whether the anti-counterfeiting dot matrix of the chip to be detected has a variable structural color. If it is not observed, the chip to be detected is judged to be counterfeit. If it is observed, it enters the second level of laser detection. The detection end fixes the chip to be detected at the detection laser irradiation position of the dedicated detection device, starts the detection device, and makes the spot of the detection laser cover the anti-counterfeiting dot matrix of the chip to be detected to obtain a diffraction image, reads the image coding information from the diffraction image, and compares it with the preset anti-counterfeiting coding information. If the two are consistent, the chip to be detected is judged to be authentic. If the two are inconsistent, the chip to be detected is judged to be counterfeit. The anti-counterfeiting dot matrix on the genuine chip has been miniaturized and has a variable structural color. The reading method is very simple and visible, and it is easy to identify the authenticity.

[0017] On the third aspect, an embodiment of the present application proposes a codable surface optical anti-counterfeiting system for a radio frequency chip, the system comprising: a processing end and a detection end, the processing end being composed of a phase map mapping module, a dot map mapping module and a processing device, and the detection end being composed of a structural color detection module, a laser detection module and a detection device; the phase map mapping module being used to calculate the corresponding binary phase map according to preset anti-counterfeiting coding information using an iterative Fourier algorithm; the dot map mapping module being used to perform dot matrix calculation based on the calculated binary phase map to obtain a binary dot matrix required for laser processing; the processing device being used to perform separate laser processing on the chip to be processed according to the calculated binary dot matrix by laser direct writing, and to process anti-counterfeiting dot matrix on the surface of the chip to be processed; the structural color detection module being used to observe whether the anti-counterfeiting dot matrix of the chip to be detected has variable structural color by changing the observation angle, and to detect whether the anti-counterfeiting dot matrix of the chip to be detected has variable structural color by changing the observation angle. When it is observed that the anti-counterfeiting dot matrix of the chip to be detected has no variable structural color, the chip to be detected is determined to be counterfeit; when it is observed that the anti-counterfeiting dot matrix of the chip to be detected has variable structural color, the chip to be detected is fixed at the detection laser irradiation position of the detection device, and the laser detection module is instructed to start the detection device; the laser detection module is used to start the detection device after receiving the start instruction sent by the structural color detection module, so that the light spot of the detection laser of the detection device covers the anti-counterfeiting dot matrix of the chip to be detected to obtain a diffraction image; the detection device is used to project a detection laser to the chip to be detected, read out the image coding information from the obtained diffraction image, and compare it with the preset anti-counterfeiting coding information; when the read image coding information is consistent with the anti-counterfeiting coding information, the chip to be detected is determined to be authentic; when the read image coding information is inconsistent with the anti-counterfeiting coding information, the chip to be detected is determined to be counterfeit.

[0018] In a fourth aspect, an embodiment of the present application proposes an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the optical anti-counterfeiting method for the encodable surface of a radio frequency chip as described in the first aspect above, or can execute the optical anti-counterfeiting method for the encodable surface of a radio frequency chip as described in the second aspect above.

[0019] In the fifth aspect, an embodiment of the present application proposes a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it can implement the optical anti-counterfeiting method for the encodable surface of a radio frequency chip as described in the first aspect above, or it can implement the optical anti-counterfeiting method for the encodable surface of a radio frequency chip as described in the second aspect above.

[0020] It can be understood that the beneficial effects of the third to fifth aspects can be found in the relevant descriptions of the first and second aspects, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related technologies, the drawings required for use in the embodiments of the present application or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a flow chart of an optical anti-counterfeiting method for a codable surface of a radio frequency chip applied to a processing end, provided in one embodiment of the present application;

[0023] Figure 2 It is a flowchart of a method for optical anti-counterfeiting of a codable surface of a radio frequency chip applied to a detection end, provided in another embodiment of the present application;

[0024] Figure 3 is a schematic structural diagram of a detection device provided in another embodiment of the present application;

[0025] Figure 4 It is a flowchart of the whole process of a method for optical anti-counterfeiting of a codable surface of a radio frequency chip provided in another embodiment of the present application;

[0026] Figure 5 It is a structural schematic diagram of a codable surface optical anti-counterfeiting system of a radio frequency chip provided in another embodiment of the present application;

[0027] Figure 6 It is a structural schematic diagram of an electronic device provided in another embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. In the various embodiments of the present application, many technical details are proposed in order to make the reader better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can also be implemented. The division of the following embodiments is only for the convenience of description, and the specific implementation mode of the present application should not constitute any limitation. The various embodiments can be combined with each other and referenced to each other under the premise of no contradiction.

[0029] In order to solve the technical problems of the currently proposed physical chip anti-counterfeiting methods, such as complex processes, high costs, the need for additional consumables, the risk of environmental pollution, and the inability to achieve independent codable anti-counterfeiting, an embodiment of the present application proposes a codable surface optical anti-counterfeiting method for a radio frequency chip, which is applied to the processing end. The implementation details of the codable surface optical anti-counterfeiting method for a radio frequency chip proposed in this embodiment are specifically described below. The following content is only provided for the convenience of understanding and is not necessary for the implementation of this solution.

[0030] The specific process of the optical anti-counterfeiting method for the encodable surface of a radio frequency chip applied to the processing end proposed in this embodiment can be as follows: Figure 1 As shown, including:

[0031] Step 101, according to the preset anti-counterfeiting coding information, using the iterative Fourier algorithm, calculate the corresponding binary phase map.

[0032] In the specific implementation, when the processing end performs anti-counterfeiting processing on the chip to be processed, it must first calculate the corresponding binary phase map according to the preset anti-counterfeiting coding information using the iterative Fourier algorithm. If there is a special need, the technicians can design the anti-counterfeiting coding information for each chip to be processed.

[0033] It is worth noting that the preset anti-counterfeiting coding information is also the basis for identification at the detection end. Therefore, the preset anti-counterfeiting coding information needs to be synchronized between the processing end and the detection end. For example, the two parties agree in advance, or the processing end synchronizes the preset anti-counterfeiting coding information to the detection end after completing the anti-counterfeiting processing.

[0034] Step 102, performing lattice calculation based on the calculated binary phase image to obtain a binary lattice image required for laser processing.

[0035] In the specific implementation, the binary phase map has visualized the anti-counterfeiting coding information, but the degree of miniaturization is not enough, and the binary phase map cannot be directly ablated onto the surface of the chip to be processed. Therefore, the processing end needs to perform dot matrix calculation based on the calculated binary phase map to obtain the binary dot matrix required for laser processing. The binary dot matrix has been miniaturized and can be easily ablated onto the surface of the chip to be processed.

[0036] Step 103 , according to the binary dot matrix obtained by calculation, a laser direct writing method is used to perform separate laser processing on the chip to be processed, and an anti-counterfeiting dot matrix is ​​processed on the surface of the chip to be processed.

[0037] In a specific implementation, after the processing end calculates the binary dot matrix, it can use laser direct writing to perform separate laser processing on the chip to be processed according to the calculated binary dot matrix, and process the anti-counterfeiting dot matrix on the surface of the chip to be processed.

[0038] In one example, according to the calculated binary dot pattern, a processing laser is used to irradiate the corresponding position of the surface of the chip to be processed, and pits are ablated at the corresponding position of the surface of the chip to be processed to form an anti-counterfeiting dot pattern. The pits are deeper than the unprocessed surface, so when the detection laser (the detection laser is used by the detection end when performing anti-counterfeiting identification) irradiates the anti-counterfeiting dot pattern processed according to the binary dot pattern, there is an optical path difference between the detection laser incident on the pits and the detection laser reflected by the unprocessed surface, and there is a phase difference between the detection laser reflected by the pits and the detection laser reflected by the unprocessed surface. By reasonably controlling the depth of the pits formed by the processing laser, the modulation of the phase difference can be achieved.

[0039] In one example, the depth of the pit is 0.25+k times the wavelength λ of the detection laser. In this way, when the detection laser is irradiated on the anti-counterfeiting dot matrix, the optical path difference will satisfy λ(0.5+k), and the phase difference will satisfy π(0.5+k). The detection laser reflected by the anti-counterfeiting dot matrix on the chip surface can form a diffraction image corresponding to the preset anti-counterfeiting coding information in the reflection space, where k is an integer greater than or equal to 0.

[0040] In one example, the processing laser used at the processing end is an ultrafast light source, including but not limited to picosecond pulse lasers and femtosecond pulse lasers, and the anti-counterfeiting dot matrix processed on the surface of the chip to be processed is a laser-induced periodic surface structure (LIPSS). These LIPSS, as nano-gratings, can diffract visible light, and variable colorful structural colors can be observed by the naked eye by changing the observation angle. This colorful structural color not only serves as a visual anti-counterfeiting element, but also improves the aesthetics of the anti-counterfeiting structure.

[0041] In this embodiment, the processing end calculates the corresponding binary phase map according to the preset anti-counterfeiting coding information using the iterative Fourier algorithm, and then performs dot matrix calculation based on the calculated binary phase map to obtain the binary dot matrix required for laser processing. Finally, according to the calculated binary dot matrix, a laser direct writing method is used to perform separate laser processing on the chip to be processed, and an anti-counterfeiting dot matrix is ​​processed on the surface of the chip to be processed. The anti-counterfeiting dot matrix processed in this way is a physical anti-counterfeiting structure that actually exists on the surface of the chip, which cannot be transferred and is strong and reliable. The processing end performs separate processing for each chip to be processed, and can achieve separate coding anti-counterfeiting for each chip to be processed, without relying on a fixed mask, and has high flexibility. Laser processing has low thermal effect, high efficiency, no risk of environmental pollution, and will not cause additional damage to the chip to be processed.

[0042] In order to solve the technical problems of the currently proposed physical chip anti-counterfeiting methods, such as complex processes, high costs, the need for additional consumables, the risk of environmental pollution, and the inability to achieve independent codable anti-counterfeiting, another embodiment of the present application proposes a codable surface optical anti-counterfeiting method for a radio frequency chip, which is applied to the detection end. The implementation details of the codable surface optical anti-counterfeiting method for a radio frequency chip proposed in this embodiment are specifically described below. The following content is only relevant details provided for ease of understanding and is not necessary for the implementation of this solution.

[0043] The specific process of the optical anti-counterfeiting method for the codable surface of a radio frequency chip applied to the detection end proposed in this embodiment can be as follows: Figure 2 As shown, including:

[0044] Step 201 , observe whether the anti-counterfeiting dot matrix of the chip to be detected has variable structural color by changing the observation angle. If it is observed, execute step 202 ; if not, directly execute step 207 .

[0045] Step 202: fix the chip to be tested at the testing laser irradiation position of the testing device.

[0046] In the specific implementation, the detection end includes two levels of authenticity identification of the chip to be detected. The first level is variable structural color detection. The anti-counterfeiting dot matrix of the authentic chip processed by the processing end is a LIPSS structure with variable structural colors visible to the naked eye. The detection end (or the technicians at the detection end) observes whether the anti-counterfeiting dot matrix of the chip to be detected has variable structural colors by changing the observation angle. If no variable structural color is observed, the chip to be detected can be directly judged as counterfeit. If variable structural color is observed, the chip to be detected needs to be fixed at the detection laser irradiation position of the detection device and enter the second level of laser detection in order to accurately determine the authenticity of the chip to be detected.

[0047] Step 203, start the detection device so that the spot of the detection laser covers the anti-counterfeiting dot matrix of the chip to be detected to obtain a diffraction image.

[0048] Step 204: read the image coding information from the acquired diffraction image and compare it with the preset anti-counterfeiting coding information.

[0049] In a specific implementation, after the detection end fixes the chip to be detected at the detection laser irradiation position of the detection device, the detection device can be started so that the spot of the detection laser covers the anti-counterfeiting dot matrix of the chip to be detected to obtain a diffraction image, and then the image coding information is read from the obtained diffraction image and compared with the preset anti-counterfeiting coding information.

[0050] In one example, the specific structure of the detection device can be as follows Figure 3As shown, the detection device consists of a detection laser 301, a collimating beam expander 302, an aperture 303, a convex lens 304, a digital camera 305 and a computer 306. The detection laser 301 and the digital camera 305 are aligned with the chip 401 to be detected, the collimating beam expander 302 is arranged on the optical path of the detection laser 301, and the convex lens 304 and the aperture 303 are arranged on the optical path of the digital camera 305. A communication connection is established between the digital camera 305 and the computer 306. When the detection device is working, the detection laser emitted by the detection laser 301 is expanded and collimated by the collimating beam expander 302, and then irradiates the anti-counterfeiting dot matrix covering the entire chip to be detected 401. After being reflected by the chip to be detected 401, the stray light is filtered out by the aperture 303, and then processed by the convex lens 304 to form a diffraction image on the digital camera 305. The digital camera 305 captures the diffraction image and transmits it to the computer 306. The computer 306 reads the image coding information from the diffraction image and compares it with the preset anti-counterfeiting coding information.

[0051] Step 205 , determining whether the read image coding information is consistent with the anti-counterfeiting coding information, if they are consistent, executing step 206 , if they are inconsistent, executing step 207 .

[0052] Step 206, determining that the chip to be tested is real.

[0053] Step 207: determine whether the chip to be tested is counterfeit.

[0054] In a specific implementation, a computer determines whether the read image coding information is consistent with the anti-counterfeiting coding information. If the two are consistent, the detection end determines that the chip to be detected is authentic. If the two are inconsistent, the detection end determines that the chip to be detected is counterfeit.

[0055] In this embodiment, the detection end performs authenticity identification of the chip to be detected from two levels. The first level starts from the variable structural color. After the laser processing at the processing end, the anti-counterfeiting dot matrix area of ​​the genuine chip will produce a variable structural color visible to the naked eye. The detection end changes the observation angle to observe whether the anti-counterfeiting dot matrix of the chip to be detected has a variable structural color. If it is not observed, the chip to be detected is judged to be counterfeit. If it is observed, it enters the second level of laser detection. The detection end fixes the chip to be detected at the detection laser irradiation position of the dedicated detection device, starts the detection device, and makes the spot of the detection laser cover the anti-counterfeiting dot matrix of the chip to be detected to obtain a diffraction image, reads the image coding information from the diffraction image, and compares it with the preset anti-counterfeiting coding information. If the two are consistent, the chip to be detected is judged to be authentic. If the two are inconsistent, the chip to be detected is judged to be counterfeit. The anti-counterfeiting dot matrix on the genuine chip has been miniaturized and has a variable structural color. The reading method is very simple and visible, and it is easy to identify the authenticity.

[0056] In one example, a flowchart of the entire process of a method for optical anti-counterfeiting of a codable surface of a radio frequency chip proposed in this application is as follows: Figure 4 As shown, specifically including:

[0057] Step 501: Calculate the corresponding binary phase map using an iterative Fourier algorithm according to the preset anti-counterfeiting coding information.

[0058] Step 502, performing lattice calculation based on the calculated binary phase image to obtain a binary lattice image required for laser processing.

[0059] Step 503 , according to the binary dot pattern obtained by calculation, a laser direct writing method is used to perform separate laser processing on the chip to be processed, and an anti-counterfeiting dot pattern is processed on the surface of the chip to be processed.

[0060] Step 504, observe whether the anti-counterfeiting dot matrix of the chip to be detected has variable structural colors by changing the observation angle. If it is observed that the anti-counterfeiting dot matrix of the chip to be detected does not have variable structural colors, the chip to be detected is determined to be counterfeit. If it is observed that the anti-counterfeiting dot matrix of the chip to be detected has variable structural colors, the next step of laser detection is performed.

[0061] Step 505: fix the chip to be tested at the testing laser irradiation position of the testing device.

[0062] Step 506, start the detection device so that the light spot of the detection laser covers the anti-counterfeiting dot matrix of the chip to be detected to obtain a diffraction image.

[0063] Step 507, read the image coding information from the acquired diffraction image and compare it with the preset anti-counterfeiting coding information. If the read image coding information is consistent with the anti-counterfeiting coding information, the chip to be tested is determined to be authentic; if the read image coding information is inconsistent with the anti-counterfeiting coding information, the chip to be tested is determined to be counterfeit.

[0064] The step division of the above methods is only for clear description. When implemented, they can be combined into one step or some steps can be split and decomposed into multiple steps. As long as they include the same logical relationship, they are all within the scope of protection of this application; adding insignificant modifications to the algorithm or process or introducing insignificant designs without changing the core design of the algorithm and process are all within the scope of protection of this application.

[0065] Another embodiment of the present application proposes a codable surface optical anti-counterfeiting system of a radio frequency chip. The implementation details of the codable surface optical anti-counterfeiting system of a radio frequency chip proposed in this embodiment are specifically described below. The following content is only for the convenience of understanding the implementation details provided, and is not necessary for the implementation of this example. Figure 5It is a structural schematic diagram of a codable surface optical anti-counterfeiting system of a radio frequency chip proposed in this embodiment, including: a processing end 61 and a detection end 62, the processing end 61 is composed of a phase map making module 611, a dot matrix map making module 612 and a processing device 613, and the detection end 62 is composed of a structural color detection module 621, a laser detection module 622 and a detection device 623.

[0066] The phase map drawing module 611 is used to calculate the corresponding binary phase map according to the preset anti-counterfeiting coding information by using the iterative Fourier algorithm.

[0067] The dot pattern drawing module 612 is used to perform dot pattern calculation based on the calculated binary phase image to obtain the binary dot pattern required for laser processing.

[0068] The processing device 613 is used to perform separate laser processing on the chip to be processed 701 according to the calculated binary dot matrix by laser direct writing, and process the anti-counterfeiting dot matrix on the surface of the chip to be processed 701, thereby obtaining the processed chip (chip to be detected) 702.

[0069] The structural color detection module 621 is used to observe whether the anti-counterfeiting dot matrix of the chip to be detected 702 has variable structural color by changing the observation angle. When it is observed that the anti-counterfeiting dot matrix of the chip to be detected 702 does not have variable structural color, the chip to be detected 702 is determined to be counterfeit. When it is observed that the anti-counterfeiting dot matrix of the chip to be detected 702 has variable structural color, the chip to be detected 702 is fixed at the detection laser irradiation position of the detection device 623, and the laser detection module 622 is instructed to start the detection device 623.

[0070] The laser detection module 622 is used to start the detection device 623 after receiving the start instruction sent by the structural color detection module 621, so that the light spot of the detection laser of the detection device 623 covers the anti-counterfeiting dot matrix of the chip 702 to be detected, so as to obtain a diffraction image.

[0071] The detection device 623 is used to project a detection laser onto the chip 702 to be detected, read the image coding information from the acquired diffraction image, and compare it with the preset anti-counterfeiting coding information. When the read image coding information is consistent with the anti-counterfeiting coding information, the chip 702 to be detected is determined to be authentic; when the read image coding information is inconsistent with the anti-counterfeiting coding information, the chip 702 to be detected is determined to be counterfeit.

[0072] It is worth mentioning that all modules involved in this embodiment are logic modules. In practical applications, a logic unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. In addition, in order to highlight the innovative part of this application, this embodiment does not introduce units that are not closely related to solving the technical problems proposed by this application, but this does not mean that there are no other units in this embodiment.

[0073] It is not difficult to find that this embodiment is a system embodiment corresponding to the above method embodiment, and this embodiment can be implemented in conjunction with the above method embodiment. The relevant technical details and technical effects mentioned in the above embodiments are still valid in this embodiment, and in order to reduce repetition, they are not repeated here. Accordingly, the relevant technical details mentioned in this embodiment can also be applied in the above embodiments.

[0074] Another embodiment of the present application provides an electronic device, whose specific structure is as follows: Figure 6 As shown, it includes: at least one processor 801; and a memory 802 that is communicatively connected to the at least one processor 801; wherein the memory 802 stores instructions that can be executed by the at least one processor 801, and the instructions are executed by the at least one processor 801 so that the at least one processor 801 can execute the optical anti-counterfeiting method for the encodable surface of a radio frequency chip described in the above-mentioned method embodiments.

[0075] Among them, the memory and the processor are connected in a bus manner, and the bus may include any number of interconnected buses and bridges, and the bus connects various circuits of one or more processors and memories together. The bus can also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and will not be further described in this article. The bus interface is responsible for providing an interface between the bus and the transceiver. The transceiver can be one component or multiple components, such as multiple receivers and transmitters, providing a unit for communicating with various other devices on a transmission medium. The data processed by the processor is transmitted on a wireless medium through an antenna, and further, the antenna also receives data and transmits the data to the processor.

[0076] The processor is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions. Memory can be used to store data used by the processor when performing operations.

[0077] Another embodiment of the present application provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it can implement the optical anti-counterfeiting method for the encodable surface of a radio frequency chip described in the above method embodiments.

[0078] That is, those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including a number of instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, ROM (Read-Only Memory), RAM (Random Access Memory), disk or optical disk and other media that can store program codes.

[0079] Those skilled in the art will appreciate that the above embodiments are specific embodiments for implementing the present application, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present application.

Claims

1. A method for optical anti-counterfeiting of the encodable surface of a radio frequency chip, applied to a processing end, characterized in that: include: According to the preset anti-counterfeiting coding information, the corresponding binary phase map is calculated using the iterative Fourier algorithm; Performing dot calculation based on the calculated binary phase image to obtain a binary dot image required for laser processing; According to the binary dot matrix obtained by calculation, the chip to be processed is individually laser processed by laser direct writing to process an anti-counterfeiting dot matrix on the surface of the chip to be processed.

2. The method for optical anti-counterfeiting of a coded surface of a radio frequency chip according to claim 1, characterized in that: According to the calculated binary dot matrix, the laser direct writing method is used to perform separate laser processing on the chip to be processed, and an anti-counterfeiting dot matrix is ​​processed on the surface of the chip to be processed, specifically: According to the calculated binary dot matrix, a processing laser is used to irradiate the corresponding position of the surface of the chip to be processed, and pits are ablated at the corresponding position of the surface of the chip to be processed to form an anti-counterfeiting dot matrix; The detection laser is used by the detection end for anti-counterfeiting identification, and the depth of the pit is 0.25+k times the wavelength of the detection laser, where k is an integer greater than or equal to 0.

3. The method for optical anti-counterfeiting of a coded surface of a radio frequency chip according to claim 2, characterized in that: The processing laser used at the processing end is an ultrafast light source, including picosecond pulse laser and femtosecond pulse laser. The anti-counterfeiting dot matrix processed on the surface of the chip to be processed is a laser-induced periodic surface structure.

4. A method for optical anti-counterfeiting of a codable surface of a radio frequency chip according to any one of claims 1 to 3, characterized in that: According to the binary dot matrix obtained by calculation, the chip to be processed is individually laser processed by laser direct writing, and after the anti-counterfeiting dot matrix is ​​processed on the surface of the chip to be processed, the method also includes: synchronizing the preset anti-counterfeiting coding information to the detection end.

5. A method for optical anti-counterfeiting of the encodable surface of a radio frequency chip, applied to a detection end, characterized in that: include: By changing the observation angle, observe whether the anti-counterfeiting dot matrix of the chip to be tested has variable structural color; If it is observed that the anti-counterfeiting dot matrix of the chip to be tested has no variable structural color, the chip to be tested is determined to be counterfeit; If the anti-counterfeiting dot matrix of the chip to be tested is observed to have a variable structural color, the chip to be tested is fixed at the detection laser irradiation position of the detection device; Start the detection device so that the spot of the detection laser covers the anti-counterfeiting dot matrix of the chip to be detected to obtain a diffraction image; Reading image coding information from the acquired diffraction image and comparing it with preset anti-counterfeiting coding information; If the read image code information is consistent with the anti-counterfeiting code information, the chip to be tested is determined to be authentic; If the read image coding information is inconsistent with the anti-counterfeiting coding information, the chip to be tested is determined to be counterfeit.

6. The method for optical anti-counterfeiting of a coded surface of a radio frequency chip according to claim 5, characterized in that: The detection device consists of a detection laser, a collimating beam expander, an aperture, a convex lens, a digital camera and a computer. The detection laser and the digital camera are aimed at the chip to be detected, the collimating beam expander is arranged on the optical path of the detection laser, the convex lens and the aperture are arranged on the optical path of the digital camera, and a connection is established between the digital camera and the computer.

7. The method for optical anti-counterfeiting of a coded surface of a radio frequency chip according to claim 6, characterized in that: The detection laser emitted by the detection laser is expanded and collimated by the collimating beam expander, and then irradiates the anti-counterfeiting dot matrix covering the entire chip to be detected. After being reflected by the chip to be detected, the stray light is filtered out by the aperture, and then passes through the convex lens to form a diffraction image on the digital camera. The digital camera transmits the diffraction image to the computer, and the computer reads the image coding information from the diffraction image and compares it with the preset anti-counterfeiting coding information.

8. An optical anti-counterfeiting system for a radio frequency chip with a codable surface, characterized in that: include: The processing end and the detection end, the processing end is composed of a phase map making module, a dot map making module and a processing device, and the detection end is composed of a structural color detection module, a laser detection module and a detection device; The phase map drawing module is used to calculate the corresponding binary phase map according to the preset anti-counterfeiting coding information using the iterative Fourier algorithm; A dot pattern drawing module is used to perform dot pattern calculation based on the calculated binary phase image to obtain a binary dot pattern required for laser processing; A processing device is used to perform separate laser processing on the chip to be processed by laser direct writing according to the binary dot pattern obtained by calculation, so as to process an anti-counterfeiting dot pattern on the surface of the chip to be processed; The structural color detection module is used to observe whether the anti-counterfeiting dot matrix of the chip to be detected has a variable structural color by changing the observation angle. When it is observed that the anti-counterfeiting dot matrix of the chip to be detected does not have a variable structural color, the chip to be detected is determined to be counterfeit. When it is observed that the anti-counterfeiting dot matrix of the chip to be detected has a variable structural color, the chip to be detected is fixed at the detection laser irradiation position of the detection device, and the laser detection module is instructed to start the detection device; The laser detection module is used to start the detection device after receiving the start instruction sent by the structural color detection module, so that the light spot of the detection laser of the detection device covers the anti-counterfeiting dot matrix of the chip to be detected to obtain a diffraction image; The detection device is used to project a detection laser onto the chip to be detected, read the image coding information from the acquired diffraction image, and compare it with the preset anti-counterfeiting coding information. When the read image coding information is consistent with the anti-counterfeiting coding information, the chip to be detected is determined to be authentic; when the read image coding information is inconsistent with the anti-counterfeiting coding information, the chip to be detected is determined to be counterfeit.

9. An electronic device, characterized in that: include: at least one processor; and, a memory communicatively coupled to the at least one processor; In which, the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the optical anti-counterfeiting method for the encodable surface of a radio frequency chip as described in any one of claims 1 to 4, or can execute the optical anti-counterfeiting method for the encodable surface of a radio frequency chip as described in any one of claims 5 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, it can implement the optical anti-counterfeiting method for the encodable surface of a radio frequency chip as described in any one of claims 1 to 4, or it can implement the optical anti-counterfeiting method for the encodable surface of a radio frequency chip as described in any one of claims 5 to 7.

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