Portable detection device for identifying invisible anti-counterfeiting secret code

Abstract

The portable detection device comprises a light source mechanism, a secret code to be detected and an imaging mechanism, the imaging mechanism comprises a main lens cone component, the main lens cone component comprises a lens cone main body, and at least one circular polarization assembly is movably arranged in the lens cone main body; the light source mechanism is used for emitting exciting light to a secret code to be detected, the exciting light irradiates the secret code to be detected to form a circularly polarized light beam, the circularly polarized light beam enters the imaging mechanism after passing through the main lens cone component, and the imaging mechanism is used for converting the circularly polarized light beam into image information. The optical anti-counterfeiting device can be 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 portable 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 purpose of the utility model is to provide a portable detection device for identifying invisible anti-counterfeiting codes, to perform optical anti-counterfeiting detection of hidden light that is not recognizable to the naked eye, to have high security, and to realize anti-counterfeiting detection of circularly polarized light emission.

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

[0007] The utility model provides a portable detection device for identifying invisible anti-counterfeiting codes. The portable detection device for identifying invisible anti-counterfeiting codes comprises a light source mechanism, a code to be detected and an imaging mechanism. The imaging mechanism comprises a main lens barrel component, the main lens barrel component comprises a lens barrel body, and at least one circular polarization component is movably arranged in the lens barrel body; the light source mechanism is used for emitting excitation light to the code to be detected, and irradiating the code to be detected to form a circularly polarized light beam, the circularly polarized light beam passes through the main lens barrel component and then enters the imaging mechanism, and the imaging mechanism is used for converting the circularly polarized light beam into image information.

[0008] In the portable 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 to form a circularly polarized light beam, and 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] Preferably, the light source mechanism, the secret code to be detected and the imaging mechanism in the utility model are coaxially arranged.

[0011] As a preferred technical solution of the utility model, the circular polarization component is composed of a linear polarizer and a quarter wave plate. The circular polarization component can allow left circular polarized light or right circular polarized light to pass through.

[0012] As a preferred technical solution of the utility model, the circular polarization component is a left circular polarizer or a right circular polarizer.

[0013] It should be noted that 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. A left circular polarizer only allows left-handed circularly polarized light to pass through, and a right circular polarizer only allows right-handed circularly polarized light to pass through.

[0014] The wavelength range of the circular polarization component is 200 to 2500 nm, for example, it can be 200 nm, 300 nm, 350 nm, 400 nm, 450 nm, 500 nm, 550 nm, 600 nm, 650 nm, 700 nm, 800 nm, 1000 nm, 1200 nm, 1500 nm, 1600 nm, 1800 nm, 1900 nm, 2000 nm, 2100 nm, 2200 nm, 2300 nm, 2400 nm or 2500 nm, 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 detection device also includes at least one filter component, which 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, and / or the filter component is arranged on the optical path between the secret code to be detected and the circular polarization component, so that the circularly polarized light beam passes through the filter component and the circular polarization component in sequence and is emitted to the imaging mechanism.

[0016] 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.

[0017] As a preferred technical solution of the utility model, the filter assembly includes at least one filter.

[0018] The optical filter includes a long-wave pass filter, a short-wave pass filter or a band-pass filter.

[0019] The wavelength range of the filter is 200 to 2500 nm, for example, it can be 200 nm, 300 nm, 350 nm, 400 nm, 450 nm, 500 nm, 550 nm, 600 nm, 650 nm, 700 nm, 800 nm, 1000 nm, 1200 nm, 1500 nm, 1600 nm, 1800 nm, 1900 nm, 2000 nm, 2100 nm, 2200 nm, 2300 nm, 2400 nm or 2500 nm, 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, the circular polarization component is provided with a first lens seat, and the filter is provided with a second lens seat. When the filter component is located between the secret code to be measured and the circular polarization component, the second lens seat and the first lens seat are movably arranged in the lens barrel body in sequence along the light path direction.

[0021] As a preferred technical solution of the utility model, the outer wall of the lens barrel body is provided with at least one plug-in port, the first lens seat is movably arranged in the plug-in port, and the second lens seat is axially detachably connected to the inner cavity wall of the lens barrel body away from the plug-in port.

[0022] The filter assembly and the circular polarization assembly of the utility model are detachably fixed in the main lens barrel component along the light path direction, and the circular polarization assembly can be moved left and right, or the filter assembly and the circular polarization assembly can be disassembled and assembled. In the application process, according to the different characteristics of the excitation light, the setting mode of the filter assembly and the circular polarization assembly is adjusted, and the main lens barrel component is placed between the secret code to be detected and the imaging mechanism, so as to realize the detection of different hidden anti-counterfeiting lights.

[0023] As a preferred technical solution of the utility model, the light source mechanism includes an LED (Light-emitting diode) light source or a laser light source.

[0024] The wavelength of the light source generated by the light source mechanism is 200-1550nm, for example, it can be 200nm, 300nm, 350nm, 400nm, 450nm, 500nm, 550nm, 600nm, 650nm, 700nm, 800nm, 1000nm, 1200nm, 1500nm or 1550nm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0025] As a preferred technical solution of the utility model, the imaging mechanism is provided with an infrared sensing element.

[0026] 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.

[0027] 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.

[0028] Compared with the prior art, the beneficial effects of the utility model are:

[0029] The utility model provides a portable 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 to form a circularly polarized light beam, and then is incident on an imaging mechanism for imaging after passing through a circular polarization component. Hidden light information can be identified through images, and anti-counterfeiting information with multiple hidden patterns can be identified. Anti-counterfeiting detection can be performed on hidden light that is not recognizable to the naked eye, thereby realizing portable detection of circularly polarized luminescence, up-conversion circularly polarized luminescence or near-infrared circularly polarized luminescence anti-counterfeiting materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the optical path of a portable detection device for identifying invisible anti-counterfeiting codes provided in Example 1 of the utility model.

[0031] Figure 2 A schematic diagram of the optical path of a portable detection device for identifying invisible anti-counterfeiting codes provided in Example 3 of the utility model.

[0032] Figure 3 This is a schematic structural diagram of the main lens barrel component provided in Example 4 of the utility model.

[0033] Figure 4 This is a schematic diagram of the structure of the main lens barrel components after assembly provided in Example 4 of the utility model.

[0034] Among them, 1-light source mechanism; 2-secret code to be measured; 3-circular polarization component; 301-left circular polarizer; 302-first lens holder; 4-imaging mechanism; 5-filter component; 501-filter; 502-second lens holder; 6-main lens barrel component; 601-lens barrel body; 602-plug interface. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0038] In a specific embodiment, the utility model provides a portable detection device for identifying invisible anti-counterfeiting codes, including a light source mechanism, a code to be detected and an imaging mechanism, wherein the imaging mechanism includes a main lens barrel component, the main lens barrel component includes a lens barrel body, and at least one circular polarization component is movably arranged in the lens barrel body; 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 circularly polarized light beam, and the circularly polarized light beam passes through the main lens barrel component and is emitted into the imaging mechanism, and the imaging mechanism is used to convert the circularly polarized light beam into image information.

[0039] Preferably, the light source mechanism, the secret code to be detected and the imaging mechanism are coaxially arranged.

[0040] In some embodiments, the circular polarization component is composed of a linear polarizer and a quarter wave plate, and can allow left circularly polarized light or right circularly polarized light to pass through.

[0041] In some embodiments, the circular polarization component is a left circular polarizer or a right circular polarizer, the left circular polarizer only allows left-handed circularly polarized light to pass through, and the right circular polarizer only allows right-handed circularly polarized light to pass through.

[0042] Specifically, the wavelength range of the circular polarization component is 200-2500 nm.

[0043] In some embodiments, the detection device further includes at least one filter component, which is disposed on the optical path between the light source mechanism and the secret code to be measured, so that the excitation light is irradiated on the secret code to be measured after passing through the filter component, and / or the filter component is disposed on the optical path between the secret code to be measured and a circular polarization component, so that the circularly polarized light beam passes through the filter component and the circular polarization component in sequence and then is emitted to the imaging mechanism.

[0044] 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.

[0045] In some embodiments, the filter assembly includes at least one filter. Specifically, the filter includes a long-wave pass filter, a short-wave pass filter, or a band-pass filter, and the wavelength range of the filter is 200 to 2500 nm.

[0046] In some embodiments, the circular polarization component is provided with a first lens seat, and the filter is provided with a second lens seat. When the filter component is located between the secret code to be measured and the circular polarization component, the second lens seat and the first lens seat are movably arranged in the lens barrel body in sequence along the light path direction.

[0047] Specifically, the outer peripheral wall of the lens barrel main body is provided with at least one plug-in interface, the first lens seat is movably arranged in the plug-in interface, and the second lens seat is detachably connected to the inner cavity wall of the lens barrel main body away from one end of the plug-in interface along the axial direction. The filter assembly and the circular polarization assembly are detachably fixed in the main lens barrel component along the optical path direction, and the circular polarization assembly can be moved left and right, or the filter assembly and the circular polarization assembly can be disassembled and assembled. In the application process, according to the different characteristics of the excitation light, the setting mode of the filter assembly and the circular polarization assembly is adjusted, and the main lens barrel component is placed between the secret code to be measured and the imaging mechanism to realize the detection of different concealed anti-counterfeiting lights. In the process of use, the left circular polarizer or the right circular polarizer is moved from the plug-in interface to the inner cavity of the lens barrel main body, so that the left circular polarizer or the right circular polarizer is coaxial with the filter and aligned with the optical path.

[0048] In some embodiments, the light source mechanism includes an LED light source or a laser light source. Specifically, the light source wavelength generated by the light source mechanism is 200 to 1550 nm.

[0049] In some embodiments, the imaging mechanism is provided with an infrared sensing element.

[0050] In some embodiments, the imaging mechanism is a CCD imaging mechanism or a CMOS imaging mechanism. Specifically, it can be a camera phone or a video camera.

[0051] 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.

[0052] Example 1

[0053] This embodiment provides a portable detection device for identifying invisible anti-counterfeiting codes, which can identify circularly polarized luminous code samples, such as Figure 1 As shown, it specifically includes a coaxially arranged light source mechanism 1, a code to be detected 2 and an imaging mechanism 4. The imaging mechanism 4 includes a main lens barrel component 6, which includes a lens barrel body, and a circular polarization component 3 composed of a linear polarizer and a quarter wave plate is movably arranged in the lens barrel body, allowing left-handed circularly polarized light or right-handed circularly polarized light to pass through. Figure 1 As shown, the light source mechanism 1 is used to emit excitation light to the secret code 2 to be tested, and irradiate the secret code 2 to be tested to form a circularly polarized light beam. After the circularly polarized light beam passes through the circular polarization component 3 of the main barrel component 6, it is incident on the imaging mechanism 4. The imaging mechanism 4 is used to convert the circularly polarized light beam into image information.

[0054] Example 2

[0055] This embodiment provides a portable detection device for identifying invisible anti-counterfeiting codes. The difference from Embodiment 1 is that a switchable left circular polarizer and a right circular polarizer are arranged in the lens barrel body. The left circular polarizer only allows left-handed circular polarized light to pass through, and the right circular polarizer only allows right-handed circular polarized light to pass through. The rest of the structure is the same as Embodiment 1.

[0056] Example 3

[0057] This embodiment provides a portable detection device for identifying invisible anti-counterfeiting codes, which is different from the second embodiment in that: Figure 2 As shown, two filter components 5 are arranged in sequence between the light source mechanism 1 and the secret code to be detected 2, and the rest of the structure is the same as that of the second embodiment.

[0058] Example 4

[0059] This embodiment provides a portable detection device for identifying invisible anti-counterfeiting codes, which can identify circularly polarized luminous code samples, and specifically includes a coaxially arranged light source mechanism 1, a code to be detected 2, and an imaging mechanism 4. The imaging mechanism 4 includes a main lens barrel component 6, and the main lens barrel component 6 includes a lens barrel body 601, such as Figure 3 and Figure 4 As shown, two filter assemblies 5, a left circular polarizer 301 and a right circular polarizer are sequentially arranged in the axial direction in the lens barrel main body 601, so that the circularly polarized light beam passes through the two filter assemblies 5 and the left circular polarizer 301 or the right circular polarizer in sequence, and then forms an image in the imaging mechanism 4. The left circular polarizer 301 and the right circular polarizer are independently provided with a first lens holder 302. The filter assembly 5 includes a filter 501 and a second lens holder 502 for carrying the filter 501. Two plug-in ports 602 are provided at both ends of the outer peripheral wall of the lens barrel main body 601, and the first lens holders 302 of the left circular polarizer 301 and the right circular polarizer are respectively movably arranged in the two plug-in ports 602, and the two second lens holders 502 are detachably connected to the inner cavity wall of the lens barrel main body 601 away from the plug-in port 602.

[0060] 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 portable detection device for identifying invisible anti-counterfeiting codes, characterized in that: The portable detection device for identifying invisible anti-counterfeiting codes includes a light source mechanism, a code to be detected and an imaging mechanism, wherein the imaging mechanism includes a main lens barrel component, wherein the main lens barrel component includes a lens barrel body, wherein at least one circular polarization component is movably arranged inside the lens barrel body; 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 circularly polarized light beam, wherein the circularly polarized light beam passes through the main lens barrel component and is incident on the imaging mechanism, wherein the imaging mechanism is used to convert the circularly polarized light beam into image information.

2. The portable 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.

3. The portable detection device for identifying invisible anti-counterfeiting codes according to claim 1, characterized in that: The circular polarization component is a left circular polarizer or a right circular polarizer.

4. The portable detection device for identifying invisible anti-counterfeiting codes according to claim 1, characterized in that: The detection device also includes at least one filter component, which 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, and / or the filter component is arranged on the optical path between the secret code to be detected and the circular polarization component, so that the circularly polarized light beam passes through the filter component and the circular polarization component in sequence and is emitted to the imaging mechanism.

5. The portable detection device for identifying invisible anti-counterfeiting codes according to claim 4 is 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.

6. The portable detection device for identifying invisible anti-counterfeiting codes according to claim 5, characterized in that: The circular polarization component is provided with a first lens seat, and the filter is provided with a second lens seat. When the filter component is located between the secret code to be detected and the circular polarization component, the second lens seat and the first lens seat are movably arranged in the lens barrel body in sequence along the light path direction.

7. The portable detection device for identifying invisible anti-counterfeiting codes according to claim 6, characterized in that: The outer peripheral wall of the lens barrel body is provided with at least one plug-in port, the first lens seat is movably arranged in the plug-in port, and the second lens seat is detachably connected to the inner cavity wall of the lens barrel body at one end away from the plug-in port along the axial direction.

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

9. The portable 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 portable detection device for identifying invisible anti-counterfeiting codes according to claim 9, characterized in that: The imaging mechanism is a CCD imaging mechanism or a CMOS imaging mechanism.

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