An identification film and a circuit board

Abstract

This invention discloses a labeling film and a circuit board. The labeling film has a labeling layer comprising a first region and a second region. A first labeling code is disposed on the first region, and a second labeling code is disposed on the second region. A first light-transmitting layer is disposed on one side of the labeling layer, and the first light-transmitting layer has a first light-transmitting area and a second light-transmitting area. The first light-transmitting area corresponds to the first region, and the second light-transmitting area corresponds to the second region. The light transmittance of the first light-transmitting area and the second light-transmitting area are different. By setting the first and second labeling codes and the light-transmitting areas with different light transmittances in the identifiable direction, two types of labeling codes can be selectively identified, achieving functions such as anti-counterfeiting and distributed information storage.

Description

Technical Field

[0001] This invention relates to the field of identification code manufacturing technology, and more particularly to an identification film and a circuit board containing the identification film. Background Technology

[0002] With the rapid development of the electronics industry, electronic products are becoming increasingly smaller, lighter, and more densely assembled, which greatly promotes the development of flexible circuit boards, thereby enabling the integration of various components and wires.

[0003] Electronic products integrate various components. In order to better trace the electronic product or a certain component inside it, an identification code is often set inside the electronic product. By scanning the identification code, the information of the product or a certain component can be traced, and the authenticity of the product or component can be verified.

[0004] Patent document [CN 212970634 U] discloses a film and circuit board in which an identification code is set on the film, and then the film is pasted on a product or a component. The product information can be traced and verified by scanning the identification code. However, as unscrupulous merchants continue to improve their counterfeiting techniques, the identification results of counterfeit identification codes are becoming increasingly consistent with those of genuine products. Therefore, the existing identification code structure is difficult to use as a basis for distinguishing between genuine and counterfeit products, which is detrimental to the rights protection of consumers and legitimate manufacturers. Summary of the Invention

[0005] The purpose of this invention is to provide an identification film and circuit board that can further improve the accuracy of identification results.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, a labeling film is provided, comprising:

[0008] The identification code layer includes a first region and a second region, wherein a first identification code is set on the first region and a second identification code is set on the second region;

[0009] A first light-transmitting layer is disposed on one side of the identification code layer. The first light-transmitting layer is provided with a first light-transmitting area and a second light-transmitting area. The first light-transmitting area corresponds to the first area, and the second light-transmitting area corresponds to the second area. The light transmittance of the first light-transmitting area and the second light-transmitting area are different.

[0010] As a preferred embodiment of the labeling film, the thickness of the first light-transmitting area is less than the thickness of the second light-transmitting area.

[0011] As a preferred embodiment of the labeling film, a first hollow area is provided in the first light-transmitting area, and the positions of the first hollow area and the first labeling code in the first area are directly opposite each other.

[0012] As a preferred embodiment of the marking film, it includes a second light-transmitting layer disposed on the side of the first light-transmitting layer away from the marking code layer, and the light transmittance of the second light-transmitting layer is greater than that of the first light-transmitting layer.

[0013] As a preferred option for labeling films

[0014] The identification code layer includes a first contrast layer and a second contrast layer. The first contrast layer is disposed between the second contrast layer and the first light-transmitting layer. The gray values ​​of the first contrast layer and the second contrast layer are different.

[0015] The first contrast layer is provided with a first hollow pattern and a second hollow pattern, and the first hollow pattern and the second hollow pattern are combined with the second contrast layer to form the first identification code and the second identification code.

[0016] As a preferred embodiment of the marking film, the marking code layer includes a first contrast layer, wherein the grayscale value of the first light-transmitting layer is different from that of the first contrast layer;

[0017] The first light-transmitting area is provided with a third hollow pattern, and the second light-transmitting area is provided with a fourth hollow pattern. The third hollow pattern is combined with the first contrast layer to form the first identification code, and the fourth hollow pattern is combined with the first contrast layer to form the second identification code.

[0018] As a preferred embodiment of the labeling film, the labeling layer includes a first contrast layer and a second contrast layer, wherein the first contrast layer is disposed between the second contrast layer and the first light-transmitting layer, and the gray values ​​of the first contrast layer, the second contrast layer, and the first light-transmitting layer are all different.

[0019] A fifth hollow pattern is provided on the first contrast layer corresponding to the first light-transmitting area, a sixth hollow pattern is provided on the first light-transmitting area, and a seventh hollow pattern is provided on the second light-transmitting area. The fifth hollow pattern, the sixth hollow pattern and the second contrast layer are combined to form the first identification code, and the seventh hollow pattern is combined with the first contrast layer and the second contrast layer to form the second identification code.

[0020] As a preferred embodiment of the marking film, the first contrast layer is a metal layer or an insulating layer, and the second contrast layer is a metal layer or an insulating layer.

[0021] As a preferred embodiment of the marking film, one of the first contrast layer and the second contrast layer is black, and the other of the first contrast layer and the second contrast layer is white.

[0022] As a preferred embodiment of the labeling film, the first labeling code includes at least one of a barcode, a QR code, and characters; and / or,

[0023] The second identification code includes at least one of barcode, QR code, and characters.

[0024] As a preferred embodiment of the marking film, the adhesive layer includes a first adhesive layer and a second adhesive layer. The first adhesive layer is disposed between the second adhesive layer and the marking code layer. The first adhesive layer is a thermosetting adhesive, and the second adhesive layer is a thermosetting adhesive or a thermoplastic adhesive.

[0025] As a preferred embodiment of the marking film, it further includes a bonding adhesive layer disposed on the side of the marking code layer away from the first light-transmitting layer.

[0026] As a preferred embodiment of the marking film, a protective layer is provided on the outer side of the marking code layer and / or the first light-transmitting layer.

[0027] In a second aspect, a circuit board is provided, comprising a substrate layer and the aforementioned marking film, wherein the marking film is disposed on the substrate layer.

[0028] The beneficial effects of the present invention are as follows: by setting a first identification code and a second identification code, the identification code information can be stored in a dispersed manner. By setting the light transmittance of the first light-transmitting area and the second light-transmitting area to be different, the amount of light passing through the first light-transmitting area and the second light-transmitting area can be different under different lighting conditions, thereby selectively identifying the first identification code and / or the second identification code, so as to hide the first identification code or the second identification code in a low light environment. Attached Figure Description

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0030] Figure 1 This is a schematic diagram of the labeling film described in Embodiment 1 of the present invention.

[0031] Figure 2 This is a schematic diagram of the labeling film described in Embodiment 2 of the present invention.

[0032] Figure 3 This is a schematic diagram of the labeling film described in Embodiment 3 of the present invention.

[0033] Figure 4 This is a schematic diagram of the labeling film described in Embodiment 4 of the present invention.

[0034] Figure 5 This is a schematic diagram of the labeling film described in Embodiment 5 of the present invention.

[0035] Figure 6 This is a schematic diagram of the labeling film described in Embodiment Six of the present invention.

[0036] Figure 7 This is a schematic diagram of the labeling film described in Embodiment 7 of the present invention.

[0037] Figure 8 This is a schematic diagram of the labeling film described in Embodiment 7 of the present invention.

[0038] Figure 9 This is a schematic diagram of the labeling film described in Embodiment 7 of the present invention.

[0039] Figure 10 This is a schematic diagram of the circuit board described in Embodiment 1 of the present invention.

[0040] Figure 11 This is a schematic diagram of the circuit board described in Embodiment 2 of the present invention.

[0041] In the picture:

[0042] 100. Marking film; 200. Substrate layer; 300. Shielding film;

[0043] 1. Connecting adhesive layer; 11. First connecting layer; 12. Second connecting layer; 2. Identification code layer; 21. First contrast layer; 212. First hollow pattern; 213. Second hollow pattern; 214. Fifth hollow pattern; 22. Second contrast layer; 23. First identification code; 24. Second identification code; 3. First light-transmitting layer; 31. First light-transmitting area; 32. Second light-transmitting area; 311. First hollow area; 312. Third hollow pattern; 313. Fourth hollow pattern; 314. Sixth hollow pattern; 315. Seventh hollow pattern; 4. Second light-transmitting layer; 5. Protective film; 6. Insulating adhesive layer. Detailed Implementation

[0044] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] like Figures 1 to 3 As shown, the present invention provides an identification film 100, which includes a connecting adhesive layer 1, an identification code layer 2 and a first light-transmitting layer 3, wherein the identification code layer 2 is disposed between the connecting adhesive layer 1 and the first light-transmitting layer 3. It is understood that the adhesive layer 1 is used to install and connect the labeling film 100 to the outside. The adhesive layer 1 is not necessary. In other embodiments, the adhesive layer 1 may not be provided. In this case, the labeling film 100 is fixed to the external product in other ways, such as making holes in the labeling film 100 and fixing it with screws. The labeling code layer 2 has an identifiable labeling code area, including a first area and a second area. A first labeling code 23 is provided on the first area and a second labeling code 24 is provided on the second area. The first light-transmitting layer 3 is provided on the side of the labeling code layer 2 away from the adhesive layer 1. The first light-transmitting layer 3 is provided with a first light-transmitting area 31 and a second light-transmitting area 32. The first light-transmitting area 31 and the first labeling code 23 of the first area are directly opposite each other. The second light-transmitting area 32 and the second labeling code 24 of the second area are directly opposite each other. The light transmittance of the first light-transmitting area 31 and the second light-transmitting area 32 are different, so that the first labeling code 23 and the second labeling code 24 can be selectively identified through the first light-transmitting area and the second light-transmitting area under different lighting conditions. By setting the first identification code 23 and the second identification code 24, the identification information can be stored in a distributed manner. For example, the production date information of the product can be stored in the first identification code 23, and the anti-counterfeiting information of the product can be stored in the second identification code 24. At this time, the second identification code 24 can be used as an anti-counterfeiting code. By setting the light transmittance of the first light-transmitting area 31 and the second light-transmitting area 32 to be different, the amount of light passing through the first light-transmitting area 31 and the second light-transmitting area 32 can be different under different lighting conditions, so that the first identification code 23 and the second identification code 24 can be selectively identified, so as to hide the first identification code or the second identification code in a low light environment.

[0047] Specifically, the first light-transmitting layer 3 is a light-transmitting adhesive layer, and the light transmittance of the first light-transmitting area 31 is greater than that of the second light-transmitting area 32. By setting the first light-transmitting layer 3 as a light-transmitting adhesive layer and setting the first light-transmitting area 31 and the second light-transmitting area 32 on the first light-transmitting layer 3, when the ambient light is weak, because the light transmittance of the first light-transmitting area 31 is higher, more light passes through the first light-transmitting area 31, so the first identification code 23 can be identified. However, the light transmittance of the second light-transmitting area 32 is lower, and less light passes through the second light-transmitting area 32, so the first light-transmitting layer 3 blocks the second identification code 24. At this time, the second identification code 24 is hidden. When the ambient light is strong, more light passes through the second light-transmitting area 32, so the second identification code 24 can be exposed. The second identification code 24 can be identified by a scanner, thereby obtaining the information of the second identification code 24. That is, the second identification code 24 with anti-counterfeiting function can only be identified under specific conditions, improving the accuracy of the identification results and helping to distinguish between genuine and counterfeit products.

[0048] Reference Figure 1 In one embodiment, the thickness of the first light-transmitting area 31 is less than the thickness of the second light-transmitting area 32. It is understood that the thickness of the first light-transmitting layer 3 affects the transmission of light. When the thickness is relatively small, more light is transmitted. Therefore, the first light-transmitting area 31 with relatively high light transmittance and the second light-transmitting area 32 with relatively low light transmittance can be formed by changing the thickness of the first light-transmitting layer 3.

[0049] Reference Figure 2 and Figure 3 In one embodiment, a first hollow area 311 is provided within the first light-transmitting area 31, and the first hollow area 311 and the first identification code 23 of the first area are directly opposite each other. By providing the first hollow area 311, the first identification code 23 can be exposed in a hollowed-out manner, reducing the obstruction of the first identification code 23 by the first light-transmitting layer 3, and ensuring that the first identification code 23 can be identified even in dark environments. (Refer to...) Figure 3 The first light-transmitting layer 3 can be directly perforated using equipment. In this case, the first light-transmitting area 31 is set as a through hole, forming the first perforated area 311. Of course, referring to... Figure 2 In other embodiments, the first hollow area 311 can also be formed by having a portion of the first light-transmitting area 31 through and another portion not through.

[0050] Reference Figure 4Specifically, the labeling film 100 further includes a second light-transmitting layer 4, which is disposed on the side of the first light-transmitting layer 3 away from the labeling code layer 2. The light transmittance of the second light-transmitting layer 4 is greater than that of the first light-transmitting layer 3. By providing the second light-transmitting layer 4, the second light-transmitting layer 4 can provide protection for the labeling code layer 2, preventing the labeling code layer 2 from being scratched, thereby ensuring that the first labeling code 23 and the second labeling code 24 on the labeling code layer 2 can be accurately identified.

[0051] In one embodiment, reference is made to Figure 5 The identification code layer 2 includes a first contrast layer 21 and a second contrast layer 22. The first contrast layer 21 is disposed between the second contrast layer 22 and the first light-transmitting layer 3. The gray values ​​of the first contrast layer 21 and the second contrast layer 22 are different. A first hollow pattern 212 and a second hollow pattern 213 are respectively disposed on the first contrast layer 21. The first hollow pattern 212 and the second hollow pattern 213 are combined with the second contrast layer 22 to form the first identification code 23 and the second identification code 24.

[0052] In another embodiment, reference is made to Figure 6 Specifically, the identification code layer 2 includes a first contrast layer 21, the first contrast layer 21 has a different gray value from the first light-transmitting layer 3, the first light-transmitting area 31 is provided with a third hollow pattern 312, the second light-transmitting area 32 is provided with a fourth hollow pattern 313, the third hollow pattern 312 and the first contrast layer 21 are combined to form a first identification code 23, and the fourth hollow pattern 313 and the first contrast layer 21 are combined to form a second identification code 24.

[0053] In another embodiment, referring to Figure 7 The identification code layer 2 includes a first contrast layer 21 and a second contrast layer 22. The first contrast layer 21 is disposed between the second contrast layer 22 and the first adhesive layer 3. The grayscale values ​​of the first contrast layer 21, the second contrast layer 22, and the first light-transmitting layer 3 are all different. A fifth hollow pattern 214 is provided on the first contrast layer 21 corresponding to the first light-transmitting area 31. A sixth hollow pattern 314 is provided on the first light-transmitting area 31. A seventh hollow pattern 315 is provided on the second light-transmitting area 32. The fifth hollow pattern 214 and the sixth hollow pattern 314 are combined with the second contrast layer 22 to form the first identification code 23. The seventh hollow pattern 315 is combined with the first contrast layer 21 and the second contrast layer 22 to form the second identification code 24. The first identification code 23 and the second identification code 24 can be formed in various ways, and the forming method can be selected according to actual needs.

[0054] Preferably, the second contrast layer 22 is black and the first contrast layer 21 is white. It is understood that black and white have significantly different grayscale values, allowing for a noticeable contrast in brightness between the first contrast layer 21 and the second contrast layer 22. This enhances the clarity and resolution of the first and second identification codes 23 and 24 formed on the identification code layer 2, facilitating scanner recognition of the first and second identification codes 23 and 24. In other embodiments, the second contrast layer 22 can be set to white and the first contrast layer 21 to black.

[0055] In one embodiment, the first contrast layer 21 and the second contrast layer 22 are metal layers, and the material of the metal layer is at least one element selected from nickel, silver, platinum, titanium, aluminum, cobalt, and chromium; or, the material of the metal layer is an alloy formed from at least two of nickel, silver, platinum, titanium, aluminum, cobalt, and chromium; or, the material of the metal layer is a combination of alloys formed from at least two of nickel, silver, platinum, aluminum, titanium, aluminum, cobalt, and chromium. Specifically, the first contrast layer 21 is a light-colored metal layer, such as white or silvery-white, for example, an alloy of nickel, silver, platinum, chromium, titanium, aluminum, cobalt, or any combination of two or more of the above metals. The second contrast layer 22 is a black metal layer, for example, an elemental metal such as iron, chromium, or manganese, or an alloy thereof. For example, ferrous metals such as iron and its alloys include steel, pig iron, ferroalloys, and cast iron. In another embodiment, the first contrast layer 21 and the second contrast layer 22 are insulating layers. In other embodiments, the identification code layer 2 can also be a combination of an insulating layer and a metal layer. To meet the demand for thinner and lighter electronic devices, optionally, the thickness of the identification code layer 2 can be 2 micrometers or more, the thickness of the adhesive layer 1 can be 1-30 micrometers, the thickness of the first light-transmitting layer 3 can be 1-30 micrometers, and the thickness of the second light-transmitting layer 4 can be 1-30 micrometers. Preferably, the thickness of the identification code layer 2 is 4 micrometers, the thickness of the adhesive layer 1 is 4 micrometers, the thickness of the first light-transmitting layer 3 is 4 micrometers, and the thickness of the second light-transmitting layer 4 is 4 micrometers.

[0056] Reference Figure 9 The labeling film 100 also includes a protective layer for protecting the labeling film when it is not in use. In the illustrated example, the protective layer includes an insulating adhesive layer 6 outside the second light-transmitting layer 4 and a protective film 5 outside the connecting adhesive layer 1. The insulating adhesive layer 6 can be a colorless and transparent adhesive layer to ensure the insulation of the labeling film 100, which is especially important when the labeling layer 2 is made of metal. The protective film 5 can be a release film made of insulating material. After removing the protective film 5, the labeling film 100 can be attached to the target location through the connecting adhesive layer 1.

[0057] Specifically, the first identification code 23 includes at least one of a barcode, a QR code, and characters, and the second identification code 24 includes at least one of a barcode, a QR code, and characters. The types of the first identification code 23 and the second identification code 24 can be selected according to actual needs. The identification code is a unique and corresponding identification mark for identifying components or electronic products. The identification code may include characters such as numbers and letters, or it may be a barcode or a QR code. In this embodiment, the identification film 100 may include at least one of the above-mentioned barcodes, QR codes, and characters to identify the corresponding components or electronic products.

[0058] Reference Figure 8 Specifically, the connecting adhesive layer 1 includes a first connecting layer 11 and a second connecting layer 12. The first connecting layer 11 is disposed between the second connecting layer 12 and the identification code layer 2. The first connecting layer 11 cures after formation. When the identification code layer 2 is a metal layer, the first connecting layer 11 can serve as an insulating layer. Optionally, the first connecting layer 11 is a colorless adhesive layer. During manufacturing, sputtering and electroplating processes can be used to form a metal identification code layer 2 on the first connecting layer 11. The first connecting layer 11 is a thermosetting adhesive, and the second connecting layer 12 is a thermosetting adhesive or a thermoplastic adhesive. Thermosetting adhesives are a type of adhesive that forms chemical bonds under the individual or combined action of a thermal catalyst. After curing, thermosetting adhesives do not melt or dissolve. The first connecting layer 11 can be phenolic, urea-formaldehyde, melamine, epoxy, polyurethane, acrylate, unsaturated polyester, or silicone, etc. Thermoplastic adhesives are a type of polymer material that exhibits rubber elasticity at room temperature and becomes plastic when heated. The second connecting layer 12 can be a styrene-based resin, vinyl acetate-based resin, polyester-based resin, polyethylene-based resin, polystyrene-based resin, imide-based resin, acrylic resin, etc. Specifically, the second connecting layer 12 can be polyvinyl acetate, polyvinyl acetal, ethylene-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate copolymer resin, chlorinated vinyl resin, polyacrylate, polyamide, and polysulfone, etc.

[0059] Reference Figure 10 and Figure 11 This embodiment also provides a circuit board, which includes a substrate layer 200 and the aforementioned identification film 100. The identification film 100 can be attached to the substrate layer 200 by means of an adhesive layer, or it can be fixed to the substrate layer 200 by means of screws through holes in the identification film 100. In this case, the circuit board information can be stored by the first identification code 23 and the second identification code 24 respectively, thereby improving the anti-counterfeiting capability of the circuit board. The circuit board can be applied to computers, televisions, or smart wearable devices, etc., and this embodiment does not make any special limitations thereto. (Refer to...) Figure 11The labeling film 100 in this embodiment can also be used together with the shielding film 300. The labeling film 100 can be directly attached to the shielding film 300 through the adhesive layer 1, and then attached to the substrate layer 200.

[0060] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings, and are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no special meaning.

[0061] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0062] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0063] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A labeling film, characterized in that, include: The identification code layer includes a first region and a second region, wherein a first identification code is set on the first region and a second identification code is set on the second region; A first light-transmitting layer is disposed on one side of the identification code layer. The first light-transmitting layer has a first light-transmitting area and a second light-transmitting area. The first light-transmitting area corresponds to the first area, and the second light-transmitting area corresponds to the second area. The light transmittance of the first light-transmitting area and the second light-transmitting area are different, with the light transmittance of the first light-transmitting area being greater than that of the second light-transmitting area. When the ambient light is weak, the light transmittance of the first light-transmitting area is higher, and more light passes through the first light-transmitting area, allowing the first identification code to be identified. The light transmittance of the second light-transmitting area is lower, and less light passes through the second light-transmitting area, causing the first light-transmitting layer to block the second identification code, thus hiding the second identification code. When the ambient light is strong, more light passes through the second light-transmitting area, allowing the second identification code to be revealed and identified.

2. The labeling film according to claim 1, characterized in that, The thickness of the first light-transmitting area is less than the thickness of the second light-transmitting area.

3. The labeling film according to claim 1 or 2, characterized in that, The first light-transmitting area has a first hollow area, and the first hollow area and the first identification code are directly opposite each other.

4. The labeling film according to claim 3, characterized in that, It includes a second light-transmitting layer, which is disposed on the side of the first light-transmitting layer away from the identification code layer, and the light transmittance of the second light-transmitting layer is greater than that of the first light-transmitting layer.

5. The labeling film according to claim 1, characterized in that, The identification code layer includes a first contrast layer and a second contrast layer. The first contrast layer is disposed between the second contrast layer and the first light-transmitting layer. The gray values ​​of the first contrast layer and the second contrast layer are different. The first contrast layer is provided with a first hollow pattern and a second hollow pattern, and the first hollow pattern and the second hollow pattern are combined with the second contrast layer to form the first identification code and the second identification code.

6. The labeling film according to claim 1, characterized in that, The identification code layer includes a first contrast layer, and the gray values ​​of the first light-transmitting layer and the first contrast layer are different. The first light-transmitting area is provided with a third hollow pattern, and the second light-transmitting area is provided with a fourth hollow pattern. The third hollow pattern is combined with the first contrast layer to form the first identification code, and the fourth hollow pattern is combined with the first contrast layer to form the second identification code.

7. The labeling film according to claim 1, characterized in that, The identification code layer includes a first contrast layer and a second contrast layer. The first contrast layer is disposed between the second contrast layer and the first light-transmitting layer. The gray values ​​of the first contrast layer, the second contrast layer, and the first light-transmitting layer are all different. A fifth hollow pattern is provided on the first contrast layer corresponding to the first light-transmitting area, a sixth hollow pattern is provided on the first light-transmitting area, and a seventh hollow pattern is provided on the second light-transmitting area. The fifth hollow pattern, the sixth hollow pattern and the second contrast layer are combined to form the first identification code, and the seventh hollow pattern is combined with the first contrast layer and the second contrast layer to form the second identification code.

8. The labeling film according to claim 5 or 7, characterized in that, The first contrast layer is a metal layer or an insulating layer, and the second contrast layer is a metal layer or an insulating layer.

9. The labeling film according to claim 5 or 7, characterized in that, One of the first contrast layer and the second contrast layer is black, and the other of the first contrast layer and the second contrast layer is white.

10. The labeling film according to claim 1, characterized in that, The first identification code includes at least one of barcode, QR code, and characters; and / or, The second identification code includes at least one of barcode, QR code, and characters.

11. The labeling film according to claim 1, characterized in that, It also includes a connecting adhesive layer disposed on the side of the identification code layer away from the first light-transmitting layer.

12. The labeling film according to claim 1, characterized in that, A protective layer is provided on the outside of the identification code layer and / or the first light-transmitting layer.

13. A circuit board, comprising a substrate layer, characterized in that, It also includes a labeling film as described in any one of claims 1-12 disposed on the substrate layer.

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