Detection device for identifying invisible anti-counterfeiting secret code

Abstract

The utility model provides a detection device for identifying an invisible anti-counterfeiting secret code. The detection device comprises a detection bracket, a light source mechanism, a secret code to be detected, a circular polarization assembly and an imaging mechanism, the light source mechanism is used for emitting exciting light to a secret code to be detected and irradiating the exciting light to the secret code to be detected to form a detection light beam, the detection light beam penetrates through the circular polarization assembly and is emitted to the imaging mechanism, and the imaging mechanism is used for converting the detection light beam into image information; the light source mechanism, the secret code to be detected, the circular polarization assembly and the imaging mechanism are sequentially arranged on the detection support in the light path direction. The optical anti-counterfeiting detection device is used for optical anti-counterfeiting detection of hidden light which cannot be recognized by naked eyes, has higher safety, and realizes anti-counterfeiting detection of circularly polarized light emission.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical anti-counterfeiting detection, and relates to a detection device for identifying invisible anti-counterfeiting secret codes. Background Art

[0002] With the continuous upgrading of anti-counterfeiting technology, the detection system for anti-counterfeiting and verification is also constantly updated and optimized. The optical path system of the existing optical anti-counterfeiting system is simple and cannot meet the new requirements of multiple optical anti-counterfeiting. In particular, the anti-counterfeiting detection method for high-value items such as banknotes and luxury goods is still relatively simple and easy to crack. At this stage, the multiple anti-counterfeiting achieved by combining multiple anti-counterfeiting technologies can help improve the anti-counterfeiting performance of items.

[0003] Fluorescent anti-counterfeiting is a common anti-counterfeiting method that requires a specific light source for detection. Since only a specific wavelength of light is required as the detection light source, and the wavelength of light emission is visible to the naked eye, the difficulty of imitation of this anti-counterfeiting technology is greatly reduced. In recent years, hidden light anti-counterfeiting has become an important research field in optical anti-counterfeiting. By modulating the light emission frequency, the naked eye cannot directly identify the hidden information, and it can only be displayed under specific conditions, which greatly improves the security of the protected information.

[0004] Among various hidden lights, circularly polarized light has significant advantages in practical anti-counterfeiting applications because it can be hidden in linear polarized light, and its circular dichroism can provide potential security for the protected information. However, traditional anti-counterfeiting detection systems are designed for fluorescent anti-counterfeiting, and lack detection devices for circularly polarized luminescent anti-counterfeiting. Utility Model Content

[0005] The utility model aims to provide a detection device for identifying invisible anti-counterfeiting codes, which performs optical anti-counterfeiting detection of hidden light that cannot be identified by naked eyes, has high security, and realizes anti-counterfeiting detection of circularly polarized luminescence.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a detection device for identifying invisible anti-counterfeiting codes, the detection device for identifying invisible anti-counterfeiting codes comprises a detection bracket, a light source mechanism, a code to be detected, a circular polarization component and an imaging mechanism; the light source mechanism is used to emit excitation light to the code to be detected, and irradiate the code to be detected to form a detection light beam, the detection light beam is emitted to the imaging mechanism through the circular polarization component, the imaging mechanism is used to convert the detection light beam into image information, the light source mechanism, the code to be detected, the circular polarization component and the imaging mechanism are sequentially arranged on the detection bracket along the light path direction.

[0008] In the detection device for identifying invisible anti-counterfeiting codes provided by the utility model, the light source mechanism is located at the front end of the optical path, and the emitted excitation light is incident on the code to be detected. The detection light beam emitted by the code to be detected is circularly polarized light. After passing through the circular polarization component, it is incident on the imaging mechanism for imaging. The hidden light information is recognized through the image, and the anti-counterfeiting information with multiple hidden patterns is recognized. The hidden light that is not recognizable by the naked eye can be detected for anti-counterfeiting, and the detection of circularly polarized luminescence, up-conversion circularly polarized luminescence or near-infrared circularly polarized luminescence anti-counterfeiting materials can be realized.

[0009] The detection device in the utility model has a wide range of applications. It can be used for anti-counterfeiting detection of hidden light that is not recognizable to the naked eye, and can also be used for anti-counterfeiting detection of hidden light whose excitation light and / or emission light are both not recognizable only to the naked eye. It is particularly suitable for the detection of hidden light information such as ordinary fluorescent anti-counterfeiting light detection, near-infrared circularly polarized anti-counterfeiting light detection, up-conversion fluorescent anti-counterfeiting light detection, up-conversion near-infrared anti-counterfeiting light detection, up-conversion fluorescent anti-counterfeiting light detection, and near-infrared circularly polarized anti-counterfeiting light detection.

[0010] As a preferred technical solution of the utility model, the detection device also includes at least one filter component; the filter component is arranged on the optical path between the circular polarization component and the secret code to be detected, so that the detection light beam passes through the filter component and the circular polarization component in sequence and then is emitted to the imaging mechanism, and / or is arranged on the optical path between the light source mechanism and the secret code to be detected, so that the excitation light passes through the filter component and is irradiated on the secret code to be detected.

[0011] That is, during the application of the utility model, according to actual conditions, a filter component can be set between the circular polarization component and the secret code to be measured, or a filter component can be set between the light source mechanism and the secret code to be measured, or a filter component can be set between the circular polarization component and the secret code to be measured, and between the light source mechanism and the secret code to be measured.

[0012] As a preferred technical solution of the utility model, the filter assembly includes at least one filter.

[0013] The optical filter includes a long-wave pass filter, a short-wave pass filter or a band-pass filter.

[0014] The wavelength range of the filter described in the present invention is 200 to 2500nm, for example, it can be 200nm, 300nm, 350nm, 400nm, 450nm, 500nm, 550nm, 600nm, 650nm, 700nm, 800nm, 1000nm, 1200nm, 1500nm, 1600nm, 1800nm, 1900nm, 2000nm, 2100nm, 2200nm, 2300nm, 2400nm or 2500nm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0015] As a preferred technical solution of the utility model, the circular polarization component is composed of a linear polarizer and a quarter wave plate.

[0016] It should be noted that the circular polarization component is composed of a combination of a linear polarizer and a quarter wave plate, and can allow left circular polarized light or right circular polarized light to pass through.

[0017] As a preferred technical solution of the utility model, the circular polarization component includes at least one circular polarizer.

[0018] The circular polarizer refers to a wave plate or a combination of wave plates that allows circularly polarized light of a certain band and direction to pass through, and may include a left circular polarizer and / or a right circular polarizer. The left circular polarizer only allows left-handed circular polarization to pass through, and the right circular polarizer only allows right-handed circular polarization to pass through. When the circular polarization assembly consists of a left circular polarizer and a right circular polarizer, the operator can switch the left circular polarizer and the right circular polarizer according to the detection requirements.

[0019] The wavelength range of the circular polarization component described in the present invention is 200 to 2500nm, for example, it can be 200nm, 300nm, 350nm, 400nm, 450nm, 500nm, 550nm, 600nm, 650nm, 700nm, 800nm, 1000nm, 1200nm, 1500nm, 1600nm, 1800nm, 1900nm, 2000nm, 2100nm, 2200nm, 2300nm, 2400nm or 2500nm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0020] As a preferred technical solution of the utility model, a first support rod and a second support rod are movably provided on the detection bracket, the first support rod is used to carry the circular polarization component, and the second support rod is used to carry the secret code to be detected.

[0021] A fixing frame is also arranged on the first supporting rod, and the fixing frame is used to support the imaging mechanism. The light source mechanism is arranged on a side of the second supporting rod away from the first supporting rod.

[0022] Preferably, the light source mechanism, the secret code to be detected, the circular polarization component and the optical axis of the imaging mechanism are coaxial.

[0023] As a preferred technical solution of the utility model, a third support rod is movably provided on the detection bracket, and the third support rod is used to carry the filter assembly.

[0024] The utility model can adjust the position of the third support rod according to actual conditions, so that the third support rod is located between the first support rod and the second support rod, and / or between the light source mechanism and the second support rod. The third support rod can also be not set, and the filter component and the circular polarization component are fixed on the first support rod together, so that the detection light beam passes through the filter component and the circular polarization component in sequence.

[0025] Preferably, the first support rod, the second support rod and the third support rod are respectively provided with a first light hole, a second light hole and a third light hole. In the utility model, the first support rod, the second support rod and the third support rod can also be slidably connected to the detection bracket, so that the operator can adjust the spacing between the components to adapt to different detection scenarios.

[0026] As a preferred technical solution of the utility model, the light source mechanism includes a xenon lamp light source or a laser light source. The wavelength of the light source generated by the light source mechanism is 200 to 1550nm, for example, it can be 200nm, 300nm, 350nm, 400nm, 450nm, 500nm, 550nm, 600nm, 650nm, 700nm, 800nm, 1000nm, 1200nm, 1500nm or 1550nm, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0027] As a preferred technical solution of the utility model, the imaging mechanism is provided with an infrared sensing element.

[0028] As a preferred technical solution of the utility model, the imaging mechanism is a CCD (Charge-Coupled Device) imaging mechanism or a CMOS (Complementary Metal Oxide Semiconductor) imaging mechanism, preferably a camera phone or a video camera.

[0029] The present invention can adjust the settings of the filter component and the circular polarization component according to the characteristics of the actual excitation light and the emitted light, and can detect anti-counterfeiting codes containing left circular polarization or right circular polarization information. Exemplarily, the present invention provides the following solutions for anti-counterfeiting light detection: (1) During anti-counterfeiting detection of circularly polarized light in the ultraviolet-visible region, the naked eye alone cannot identify the true information, and a left circular polarizer or a right circular polarizer needs to be set on the light path for identification. (2) During anti-counterfeiting detection of circularly polarized light in the near-infrared region, a filter and a circular polarizer combination need to be set on the light path to assist the imaging mechanism containing an infrared sensing element in capturing the correct protected information. (3) During anti-counterfeiting detection of circularly polarized light in the near-infrared region excited by near-infrared, a concealed light source, a filter and a circular polarizer combination need to be used to assist the imaging mechanism containing an infrared sensing element in capturing the correct protected information.

[0030] Compared with the prior art, the beneficial effects of the utility model are:

[0031] The utility model provides a detection device for identifying invisible anti-counterfeiting codes, in which a light source mechanism is located at the front end of an optical path, and the emitted excitation light is incident on the code to be detected, and after passing through a circular polarization component, is incident on an imaging mechanism for imaging, and hidden light information is recognized through image, and anti-counterfeiting information with multiple hidden patterns is recognized, and anti-counterfeiting detection can be performed on hidden light that is not recognizable to the naked eye, thereby realizing the detection of circularly polarized luminescence, up-conversion circularly polarized luminescence or near-infrared circularly polarized luminescence anti-counterfeiting materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of a detection device for identifying invisible anti-counterfeiting codes provided in a specific embodiment of the utility model.

[0033] Figure 2 A schematic structural diagram of a detection device for identifying invisible anti-counterfeiting codes with a filter component provided in a specific embodiment of the utility model.

[0034] Figure 3 A schematic structural diagram of a detection device for identifying invisible anti-counterfeiting codes with a filter component provided in a specific embodiment of the utility model.

[0035] Figure 4 A schematic structural diagram of a detection bracket provided for a specific implementation of the utility model.

[0036] Figure 5 A schematic structural diagram of a first support rod provided in a specific embodiment of the utility model.

[0037] Among them, 1-light source mechanism; 2-secret code to be detected; 3-circular polarization component; 4-imaging mechanism; 5-filter component; 6-detection bracket; 601-first support rod; 602-third support rod; 603-second support rod; 604-fixed frame. DETAILED DESCRIPTION

[0038] It should be understood that, in the description of the present utility model, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0039] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0040] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0041] In a specific embodiment, the utility model provides a detection device for identifying invisible anti-counterfeiting codes, including a detection bracket, a light source mechanism 1, a code to be detected 2, a circular polarization component 3 and an imaging mechanism 4. The code to be detected 2 is used to carry the code to be detected, the light source mechanism 1 is used to emit excitation light and irradiate the code to be detected to form a detection beam, the detection beam is emitted to the imaging mechanism 4 through the circular polarization component 3, and the imaging mechanism 4 is used to convert the detection beam into image information. Figure 1 As shown, the light source mechanism 1, the secret code to be detected 2, the circular polarization component 3 and the imaging mechanism 4 are sequentially arranged on the detection bracket along the light path direction.

[0042] In some embodiments, Figure 2 and Figure 3 As shown, the detection device includes a filter component 5, which is arranged between the code to be detected 2 and the circular polarization component 3, so that the detection light beam passes through the filter component 5 and the circular polarization component 3 in sequence and then is emitted to the imaging mechanism 4, and / or is arranged on the light path between the light source mechanism 1 and the code to be detected 2, so that the excitation light passes through the filter component 5 and is irradiated on the code to be detected 2.

[0043] Specifically, the filter assembly 5 includes at least one filter, the wavelength range of the filter is 200-2500 nm, and the filter includes a long-wave pass filter, a short-wave pass filter or a band-pass filter.

[0044] In some embodiments, the circular polarization component 3 is composed of a linear polarizer and a quarter wave plate, and can allow left circular polarized light or right circular polarized light to pass through.

[0045] In some embodiments, the circular polarization component 3 includes at least one circular polarizer, the wavelength range of the circular polarizer is 200-2500nm. The circular polarizer refers to a wave plate or a wave plate combination that allows circularly polarized light of a certain wavelength band and a certain direction to pass through, and can include a left circular polarizer and / or a right circular polarizer.

[0046] In some embodiments, Figure 4 and Figure 5 As shown, the detection bracket 6 is movably provided with a first support rod 601 and a second support rod 603, the first support rod 601 is used to carry the circular polarization component 3, and the second support rod 603 is used to carry the secret code 2 to be detected. The first support rod 601 is also provided with a fixing frame 604, the fixing frame 604 is used to support the imaging mechanism 4, and the light source mechanism 1 is arranged on the side of the second support rod 603 away from the first support rod 601. Preferably, the optical axes of the light source mechanism 1, the secret code 2 to be detected, the circular polarization component 3 and the imaging mechanism 4 are coaxial. The first support rod 601 and the second support rod 603 are respectively provided with a first light hole and a second light hole to allow light to pass through.

[0047] In some embodiments, the filter assembly 5 and the circular polarization assembly 3 are sequentially arranged on the first support rod 601 along the light path direction.

[0048] In some embodiments, at least one third support rod 602 is movably provided on the detection bracket 6, and the third support rod 602 is used to carry the filter assembly 5, and the third support rod 602 is located between the first support rod 601 and the second support rod 603, and / or between the light source mechanism 1 and the first support rod 601. Specifically, the third support rod 602 is also provided with a third light hole to allow light to pass through.

[0049] Furthermore, the first support rod 601 , the second support rod 602 and the third support rod 603 are independently slidably connected to the detection bracket 6 , so as to adjust the distance between two adjacent support rods to adapt to different optical anti-counterfeiting detection scenarios.

[0050] In some embodiments, the light source mechanism 1 includes a xenon lamp light source or a laser light source. The wavelength of the light source generated by the light source mechanism 1 is 200-1550 nm.

[0051] In some embodiments, the imaging mechanism 4 is provided with an infrared sensing element.

[0052] In some embodiments, the imaging mechanism 4 is a CCD imaging mechanism or a CMOS imaging mechanism. Specifically, the imaging mechanism 4 may include a camera or a camera phone.

[0053] The present invention can adjust the settings of the filter component 5 and the circular polarization component 3 according to the characteristics of the actual excitation light and the emitted light, and can detect anti-counterfeiting codes containing left circular polarization or right circular polarization information. Exemplarily, the present invention provides the following solutions for anti-counterfeiting light detection: (1) In the case of circular polarized light anti-counterfeiting detection in the ultraviolet-visible region, the naked eye alone cannot identify the true information, and a left circular polarizer or a right circular polarizer needs to be set on the light path for identification. (2) In the case of circular polarized light anti-counterfeiting detection in the near-infrared region, a filter and a circular polarizer combination need to be set on the light path to assist the imaging mechanism 4 containing an infrared sensing element to capture the correct protected information. (3) In the case of near-infrared excited near-infrared region circular polarized light anti-counterfeiting detection, a concealed light source, a filter and a circular polarizer combination need to be used to assist the imaging mechanism 4 containing an infrared sensing element to capture the correct protected information.

[0054] Example 1

[0055] The present embodiment provides a detection device for identifying invisible anti-counterfeiting codes, which can identify circularly polarized luminous code samples, including a detection bracket, a light source mechanism, a code to be tested, a circular polarization component and a CCD imaging mechanism. The code to be tested is used to carry the circularly polarized luminous code sample, and the light source mechanism is used to emit excitation light and irradiate the circularly polarized luminous code sample to form a detection beam. The circular polarization component is composed of a combination of a linear polarizer and a 1 / 4 wave plate, allowing left circular polarized light or right circular polarized light to pass through. The CCD imaging mechanism is used to convert the detection beam into image information to capture the correct protected information.

[0056] The detection bracket is provided with a first support rod and a second support rod slidingly arranged from top to bottom in sequence. The first support rod and the second support rod are respectively provided with a first light hole and a second light hole to allow light to pass through. The light source mechanism is located below the second support rod and is used to emit excitation light. Along the light path direction of the excitation light, the secret code to be measured is fixed on the second support rod, the circular polarization component is fixed on the first support rod, and a fixing frame is also provided on the first support rod, on which an imaging mechanism is fixed. The camera of the imaging mechanism is aimed at the circular polarization component, and the optical axis of the light source mechanism, the secret code to be measured, the circular polarization component and the imaging mechanism are coaxial.

[0057] The code to be tested carries a circularly polarized luminous code sample, and the excitation light emitted by the light source mechanism irradiates the circularly polarized luminous code sample through the second light hole to form a detection beam. The detection beam is incident on the circular polarization component through the first light hole and then incident on the imaging mechanism.

[0058] Example 2

[0059] This embodiment provides a detection device for identifying invisible anti-counterfeiting codes. The difference from Embodiment 1 is that the circular polarization component consists of a left circular polarizer and a right circular polarizer that can be switched, allowing left circular polarized light or right circular polarized light to pass through, and the rest of the structure is the same as Embodiment 1.

[0060] Example 3

[0061] The present embodiment provides a detection device for identifying invisible anti-counterfeiting codes, which can identify circularly polarized luminous code samples, including a detection bracket, a light source mechanism, a code to be tested, a filter component, a circular polarization component and an imaging mechanism. The code to be tested is used to carry the circularly polarized luminous code sample, and the light source mechanism is used to emit excitation light and irradiate the circularly polarized luminous code sample to form a detection beam. The filter component is composed of two filters, and the circular polarization component is composed of a combination of a linear polarizer and a 1 / 4 wave plate, allowing left circular polarized light or right circular polarized light to pass through. The imaging mechanism is used to convert the detection beam into image information to capture the correct protected information.

[0062] The detection bracket is provided with a first support rod, a third support rod and a second support rod in a sliding manner from top to bottom. The first support rod, the second support rod and the third support rod are respectively provided with a first light hole, a second light hole and a third light hole to allow light to pass through. The light source mechanism is located below the second support rod and is used to emit excitation light. Along the optical path direction of the excitation light, the secret code to be measured is fixed on the second support rod, the filter component is fixed on the third support rod, and the circular polarization component is fixed on the first support rod. A fixing frame is also provided on the first support rod, and an imaging mechanism is fixed on the fixing frame. The camera of the imaging mechanism is aimed at the circular polarization component, and collects graphic information to capture the correct protected information. The light source mechanism, the secret code to be measured, the filter component, the circular polarization component and the optical axis of the imaging mechanism are coaxial.

[0063] The code to be tested carries a circularly polarized luminous code sample, and the excitation light emitted by the light source mechanism irradiates the circularly polarized luminous code sample through the second light hole to form a detection beam. The detection beam passes through the third light hole to the filter component, and the filtered detection beam emitted by the filter component passes through the first light hole to the circular polarization component and then enters the imaging mechanism.

[0064] Example 4

[0065] This embodiment provides a detection device for identifying invisible anti-counterfeiting codes. The difference from Embodiment 3 is that no third support rod is provided on the detection bracket, and the filter component and the circular polarization component are fixed on the first support rod in sequence along the light path direction, so that the optical axis of the light source mechanism, the code to be detected, the filter component, the circular polarization component and the imaging mechanism are coaxial, and the rest of the structure is the same as Embodiment 3.

[0066] The code to be tested carries a circularly polarized luminous code sample, and the excitation light emitted by the light source mechanism irradiates the circularly polarized luminous code sample through the second light hole to form a detection beam. The detection beam passes through the first light hole, and successively passes through the filter component and the circular polarization component, and then enters the imaging mechanism.

[0067] Example 5

[0068] This embodiment provides a detection device for identifying invisible anti-counterfeiting codes. The difference from Embodiment 3 is that the filter component is arranged between the code to be detected and the light source mechanism, and the third support rod on the detection bracket for supporting the filter component is located between the light source mechanism and the second support rod. The remaining structure is the same as Embodiment 3.

[0069] The code to be tested carries a circularly polarized luminous code sample. The excitation light emitted by the light source mechanism is irradiated on the filter component through the third light hole. The excitation light emitted by the filter component is irradiated on the circularly polarized luminous code sample through the second light hole to form a detection light beam. The detection light beam is emitted to the circular polarization component through the first light hole and then into the imaging mechanism.

[0070] The applicant declares that the above is only a specific implementation method of the present utility model, but the protection scope of the present utility model is not limited thereto. The technicians in the relevant technical field should understand that any changes or substitutions that can be easily thought of by the technicians in the relevant technical field within the technical scope disclosed in the present utility model fall within the protection scope and disclosure scope of the present utility model.

Claims

1. A detection device for identifying invisible anti-counterfeiting codes, characterized in that: The detection device for identifying invisible anti-counterfeiting codes includes a detection bracket, a light source mechanism, a code to be detected, a circular polarization component and an imaging mechanism; the light source mechanism is used to emit excitation light to the code to be detected, and irradiate the code to be detected to form a detection beam, the detection beam is emitted to the imaging mechanism through the circular polarization component, and the imaging mechanism is used to convert the detection beam into image information, and the light source mechanism, the code to be detected, the circular polarization component and the imaging mechanism are arranged on the detection bracket in sequence along the light path direction.

2. The detection device for identifying invisible anti-counterfeiting codes according to claim 1, characterized in that: The detection device further comprises at least one filter component; The filter component is arranged on the optical path between the circular polarization component and the secret code to be measured, so that the detection light beam passes through the filter component and the circular polarization component in sequence and then is emitted to the imaging mechanism, and / or is arranged on the optical path between the light source mechanism and the secret code to be measured, so that the excitation light passes through the filter component and is irradiated on the secret code to be measured.

3. The detection device for identifying invisible anti-counterfeiting codes according to claim 2, characterized in that: The optical filter assembly includes at least one optical filter; The optical filter includes a long-wave pass filter, a short-wave pass filter or a band-pass filter.

4. The detection device for identifying invisible anti-counterfeiting codes according to claim 1, characterized in that: The circular polarization component is composed of a linear polarizer and a quarter wave plate.

5. The detection device for identifying invisible anti-counterfeiting codes according to claim 1, characterized in that: The circular polarization component includes at least one circular polarizer.

6. The detection device for identifying invisible anti-counterfeiting codes according to claim 1, characterized in that: The detection bracket is movably provided with a first support rod and a second support rod, the first support rod is used to carry the circular polarization component, and the second support rod is used to carry the secret code to be detected; A fixing frame is also arranged on the first supporting rod, and the fixing frame is used to support the imaging mechanism. The light source mechanism is arranged on a side of the second supporting rod away from the first supporting rod.

7. The detection device for identifying invisible anti-counterfeiting codes according to claim 2, characterized in that: The detection bracket is also movably provided with a third support rod, and the third support rod is used to carry the filter assembly.

8. The detection device for identifying invisible anti-counterfeiting codes according to claim 1, characterized in that: The light source mechanism includes a xenon lamp light source or a laser light source.

9. The detection device for identifying invisible anti-counterfeiting codes according to claim 1, characterized in that: The imaging mechanism is provided with an infrared sensing element.

10. The detection device for identifying invisible anti-counterfeiting codes according to claim 1, characterized in that: The imaging mechanism is a CCD imaging mechanism or a CMOS imaging mechanism.

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