A film and a circuit board

Abstract

An embodiment of the present invention discloses a film and a circuit board. The film includes: a dark-colored base layer; a metal layer located on one side of the dark-colored base layer; wherein, the gray value of the color of the dark-colored base layer is less than the gray value of the color of the metal layer. The technical solution of the embodiment of the present invention can be used to form a clearly distinguishable identification code and has a wide range of applications.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of identification code production, and in particular to a film and a circuit board. Background Art

[0002] With the rapid development of the electronics industry, electronic products are further developing towards miniaturization, lightweight, and high-density assembly, which greatly promotes the development of flexible circuit boards, thereby realizing the integration of various components and wire connections.

[0003] Various components are integrated inside electronic products. 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.

[0004] At present, in the prior art, the identification code (such as a QR code) is set on a steel plate, but the size of the steel plate is limited by the thinness of electronic products, which makes it difficult to print the QR code on the steel plate. Later, the identification code was printed on a flexible board, but due to the small size of the flexible board, the printed identification code is not clear and has a low resolution. There are also cases where the identification code cannot be printed. Summary of the invention

[0005] The embodiments of the present invention provide a film and a circuit board to realize forming a clearly identifiable identification code, and the application range is wide.

[0006] In a first aspect, an embodiment of the present invention provides a membrane, the membrane comprising:

[0007] Dark base layer;

[0008] a metal layer located on one side of the dark base layer;

[0009] The grayscale value of the color of the dark base layer is smaller than the grayscale value of the color of the metal layer.

[0010] Optionally, a glue layer is also included;

[0011] The glue layer is located on a side of the dark base layer away from the metal layer.

[0012] Optionally, a protective layer is further included, which is arranged on the side of the adhesive layer facing away from the dark base layer.

[0013] Optionally, a difference between a grayscale value of a color of the dark base layer and a grayscale value of a color of the metal layer is less than or equal to a first grayscale threshold, and the first grayscale threshold is greater than or equal to 10.

[0014] Optionally, the first grayscale threshold is 50.

[0015] Optionally, the first gray-scale threshold is 100.

[0016] Optionally, the material of the metal layer is at least one single element of nickel, silver, platinum, titanium, aluminum, and chromium; or, the material of the metal layer is an alloy formed by at least two of nickel, silver, platinum, titanium, aluminum, and chromium, or, the material of the metal layer is a combination between alloys formed by at least two of nickel, silver, platinum, titanium, aluminum, and chromium.

[0017] Optionally, the thickness of the metal layer is 0.05 - 5 μm, the thickness range of the dark base layer is 0.5 - 20 μm, and the thickness range of the adhesive layer is 1 - 30 μm.

[0018] Optionally, it further includes a low-adhesion film, and the low-adhesion film is disposed on a side of the metal layer away from the dark base layer.

[0019] Optionally, the film further includes a first film layer;

[0020] The first film layer is disposed on a side of the metal layer away from the dark base layer.

[0021] Optionally, the first film layer is a colorless adhesive layer.

[0022] In a second aspect, an embodiment of the present invention further provides a film, and the film includes:

[0023] A dark base layer;

[0024] A metal layer located on one side of the dark base layer;

[0025] An adhesive layer located on a side of the dark base layer facing away from the metal layer;

[0026] Wherein, the gray-scale value of the color of the dark base layer is less than the gray-scale value of the color of the metal layer; the metal layer is used to form a hollowed-out pattern of an identification code so as to expose the dark base layer at a position corresponding to the hollowed-out pattern.

[0027] Optionally, a groove pattern is formed on a side of the dark base layer close to the metal layer, and a perpendicular projection of the hollowed-out pattern on a plane where the dark base layer is located completely coincides with the groove pattern.

[0028] Optionally, the identification code includes at least one of a bar code, a two-dimensional code, and a character.

[0029] In a third aspect, an embodiment of the present invention further provides a circuit board, and the circuit board includes a printed circuit board and the film according to any one of the embodiments of the present invention;

[0030] After removing a protective layer of the film, one side of the adhesive layer of the film is attached to the printed circuit board.

[0031] Fourthly, an embodiment of the present invention further provides a circuit board, which includes a printed circuit board, an electromagnetic shielding film, and the film provided in any one of the embodiments of the present invention. The electromagnetic shielding film is disposed on the printed circuit board;

[0032] After removing the protective layer of the film, one side of the adhesive layer of the film is attached to the printed circuit board.

[0033] In the technical solution of the embodiment of the present invention, the film includes: a dark-colored base layer; a metal layer located on one side of the dark-colored base layer; an adhesive layer located on the side of the dark-colored base layer facing away from the metal layer. Wherein, the gray value of the color of the dark-colored base layer is less than the gray value of the color of the metal layer. This solves the problems in the prior art that the steel plate size limits the printing of identification codes and the clarity of the identification codes printed on the flexible board is not high, so as to realize the formation of distinguishable identification codes and have a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic structural diagram of a film provided by an embodiment of the present invention;

[0035] Figure 2 is a schematic structural diagram of another film provided by an embodiment of the present invention;

[0036] Figure 3 is a schematic structural diagram of another film provided by an embodiment of the present invention;

[0037] Figure 4 is a schematic structural diagram of yet another film provided by an embodiment of the present invention;

[0038] Figure 5 is a schematic structural diagram of a circuit board provided by an embodiment of the present invention;

[0039] Figure 6 is a schematic structural diagram of another circuit board provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0041] It should be further noted that, for the convenience of description, only the parts related to the present invention rather than all the content are shown in the drawings. Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the operations (or steps) as sequential processes, many of the operations can be implemented in parallel, concurrently, or simultaneously. In addition, the order of the operations can be rearranged. The process can be terminated when its operations are completed, but there can also be additional steps not included in the drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, and so on.

[0042] An embodiment of the present invention provides a film, which can be applied to set identification codes for various components integrated inside electronic products. Figure 1 It is a schematic structural diagram of a film provided by an embodiment of the present invention. Refer to Figure 1 , the specific structure of this film includes:

[0043] A dark base layer 110;

[0044] A metal layer 120 located on one side of the dark base layer 110;

[0045] Wherein, the gray value of the color of the dark base layer 110 is less than the gray value of the color of the metal layer 120.

[0046] Among them, the dark base layer 110 provides protection and support for the metal layer 120, and forms a relatively obvious contrast in light and dark brightness with the metal layer 120 to a certain extent. The dark base layer 110 can be black, or a color such as dark blue whose gray value is closer to black. The specific color of the dark base layer 110 is not limited in this embodiment.

[0047] Optionally, the dark base layer 110 may include a PPS film layer, a PEN film layer, a polyester film layer, a polyimide film layer, a film layer formed after curing of epoxy resin ink, a film layer formed after curing of polyurethane ink, a film layer formed after curing of modified acrylic resin, or a film layer formed after curing of polyimide resin.

[0048] The metal layer 120 is used to form an obvious color or brightness difference with the dark base layer 110, and the gray value of the color of the metal layer 120 is greater than the gray value of the color of the dark base layer 110.

[0049] In this embodiment, grayscale parameters are used to convert a color into a high-quality grayscale gradient to detect the contrast in brightness between the metal layer 120 and the dark base layer 110. Grayscale represents various colors using black tones, that is, black is used as the reference color, and different colors are displayed as black with different saturations. The range between white and black is divided into 0 to 255 grayscale levels, with the grayscale value of white being 255 and the grayscale value of black being 0.

[0050] Exemplarily, in this embodiment, it is defined that the grayscale value of the metal layer 120 is greater than the grayscale value of the dark base layer 110, that is, it can be defined that the difference in the grayscale values of the colors of the metal layer 120 and the dark base layer 110 is relatively large. For example, if the color of the metal layer 120 is silver and the grayscale value of silver is relatively large, then the silver of the metal layer 120 forms a sharp contrast with the dark color of the dark base layer 110.

[0051] Furthermore, the difference between the grayscale value of the color of the metal layer 120 and the grayscale value of the color of the dark base layer 110 is greater than or equal to a first grayscale threshold; the first grayscale threshold is greater than or equal to 10, so the difference between the grayscale value of the color of the metal layer 120 and the grayscale value of the color of the dark base layer 110 is at least 10, creating a relatively obvious difference in light and dark between the metal layer 120 and the dark base layer 110 and improving the accuracy of the identification code recognition device in recognizing the identification code formed by the metal layer 120 and the dark base layer 110.

[0052] To further increase the brightness difference between the metal layer 120 and the dark base layer 110, the first grayscale threshold can be defined as 50, so the difference between the grayscale value of the color of the metal layer 120 and the grayscale value of the color of the dark base layer 110 is at least 50. The color of the metal layer 120 has a stronger brightness, and the color of the dark base layer 110 has a smaller brightness, further increasing the contrast in light and dark between the metal layer 120 and the dark base layer 110 and improving the recognition accuracy and precision of the identification code.

[0053] Based on the above embodiment, in this embodiment, the first grayscale threshold can be further defined as 100, so the difference between the grayscale value of the color of the metal layer 120 and the grayscale value of the color of the dark base layer 110 is at least 100. For example, if the grayscale value of the color of the dark base layer 110 is 0, the difference between the grayscale value of the color of the metal layer 120 and the grayscale value of the color of the dark base layer 110 is at least 100, and even 255. Then, the grayscale value of the metal layer 120 can be selected to be greater than or equal to 100. The case where the grayscale values differ by 255 is that one of the metal layer 120 and the dark base layer 110 is pure black and the other is pure white, that is, one of their grayscale values is 255 and the other is 0, with a large difference in brightness or color, further enhancing the clarity of the identification code.

[0054] Figure 2 It is a schematic structural diagram of another film provided by the embodiment of the present invention. Refer toFigure 2 , on the basis of the above embodiments, the film further includes an adhesive layer 130; the adhesive layer 130 is disposed on a side of the dark base layer 110 facing away from the metal layer 120. Among them, the adhesive layer 130 plays a connecting role.

[0055] Figure 3 This is a schematic structural diagram of another film provided by an embodiment of the present invention. Refer to Figure 3 , on the basis of the above embodiments, the film further includes a protective layer 140, which is disposed on a side of the adhesive layer 130 facing away from the dark base layer 110.

[0056] Among them, the protective layer 140 provides protection and support for the adhesive layer 130. In combination with Figure 2 and Figure 3 , the protective layer 140 provides protection and support for the adhesive layer 130, and a certain thickness of adhesive is coated on the protective layer 140 to form the adhesive layer 130.

[0057] The protective layer 140 may include a PPS film layer, a PEN film layer, a polyester film layer, a polyimide film layer, a film layer formed after curing of epoxy resin ink, a film layer formed after curing of polyurethane ink, a film layer formed after curing of modified acrylic resin, or a film layer formed after curing of polyimide resin.

[0058] It can be understood that the adhesive layer 130 is used to attach the film provided in this embodiment to the corresponding shielding film or component. When the adhesive layer 130 needs to be attached to the corresponding shielding film or component of the film, the protective layer 140 is removed.

[0059] According to the technical solution of the embodiment of the present invention, the film includes: a dark base layer; a metal layer located on one side of the dark base layer; among them, the gray value of the color of the dark base layer is less than the gray value of the color of the metal layer. It solves the problems in the prior art that the steel plate size limits the printing of identification codes and the clarity of the identification codes printed on the flexible board is not high, so as to realize the formation of distinguishable identification codes and have a wide range of applications.

[0060] The metal layer 120 can be made of a metal with a lighter color such as white or silver-white. On the basis of the above embodiments, the material of the metal layer is at least one simple substance of nickel, silver, platinum, titanium, aluminum, and chromium; or, the material of the metal layer is an alloy formed by at least two of nickel, silver, platinum, titanium, aluminum, and chromium, or, the material of the metal layer is a combination between alloys formed by at least two of nickel, silver, platinum, titanium, aluminum, and chromium.

[0061] Continue to refer to Figure 2, on the basis of the above embodiments, the thickness of the metal layer 120 is 0.05 - 5 μm. Preferably, the thickness of the metal layer 120 is 0.1 μm. The thickness range of the dark-colored base layer 110 is 0.5 - 20 μm. Preferably, the thickness range of the dark-colored base layer 110 is 2 - 8 μm. The thickness range of the adhesive layer 130 is 1 - 30 μm. Preferably, the thickness range of the adhesive layer 130 is 3 - 4 μm.

[0062] In order to adapt to the trend of thinning of electronic products, the thickness range of the dark-colored base layer 110 can be 2 - 8 μm, so as to minimize the thickness of the dark-colored base layer 110. Optionally, the thickness of the dark-colored base layer 110 can be selected as 4 μm, and on the premise of having good insulation and protection performance, the dark-colored base layer 110 is thinned.

[0063] Figure 4 This is a schematic structural diagram of another film provided by the embodiment of the present invention. Refer to Figure 4 , on the basis of the above embodiments, the film further includes a low-adhesion film 150, and the low-adhesion film 150 is disposed on the side of the metal layer 120 away from the dark-colored base layer 110.

[0064] Among them, the low-adhesion film 150 generally refers to a film with little or no glue that is directly electrostatically adsorbed, which will not affect the adsorption effect and will not leave residues on the attachment site when removed.

[0065] Optionally, the low-adhesion film 150 can be a silica gel film.

[0066] Optionally, to prevent the situation that the metal layer 120 contacts with external electronic components and causes a short circuit, the film further includes a first film layer (not marked in the figure). The first film layer is disposed on the side of the metal layer 120 away from the dark-colored base layer 110, and the first film layer can form an opening at a position corresponding to the hollowed-out pattern of the identification code to expose the identification code for the user to identify, or the above opening may not be provided. At this time, the first film layer is a colorless and transparent film, and can also expose the identification code for the user to identify. Optionally, the first film layer is a colorless adhesive layer.

[0067] The embodiment of the present invention also provides a film, which can be used to set identification codes for various components integrated inside electronic products. Continue to refer to Figure 2 , the specific structure of the film includes:

[0068] A dark-colored base layer 110;

[0069] A metal layer 120 located on one side of the dark-colored base layer 110;

[0070] An adhesive layer, located on the side of the dark-colored base layer 110 facing away from the metal layer 120;

[0071] Among them, the gray value of the color of the dark base layer 110 is less than the gray value of the color of the metal layer 120; the metal layer 120 is used to form a hollowed-out pattern of the identification code, so as to expose the dark base layer 110 at the corresponding position of the hollowed-out pattern.

[0072] Among them, the identification code includes at least one of a bar code, a two-dimensional code, and characters.

[0073] The identification code is a unique corresponding identification mark for identifying components or electronic products. The identification code can include character graphics such as numbers and letters, or can be a bar code or a two-dimensional code. The film in this embodiment can include at least one of the above bar code, two-dimensional code, and characters to identify the corresponding components or electronic products.

[0074] It can be understood that the film provided in this embodiment can be used to set an identification code to better trace the electronic product corresponding to the identification code or a certain component inside the electronic product. The film can be used together with a shielding film and is disposed on a circuit board. The film can be directly attached to the shielding film or the component through an adhesive layer. Further, the circuit board is disposed in a corresponding electronic device, and the electronic device can include electronic products such as mobile phones and computers. This embodiment does not make special limitations on this.

[0075] In this embodiment, the dark base layer 110 increases the recognition rate of the identification code formed on the film.

[0076] The metal layer 120 is disposed on one side of the dark base layer 110. The metal layer 120 can form a relatively obvious contrast in brightness with the dark base layer 110, thereby forming an identification code with better recognition.

[0077] Optionally, the above hollowed-out pattern can be formed by laser ablation.

[0078] It should be noted that when ablating the above hollowed-out pattern, there are two cases:

[0079] First, only the metal layer 120 is burned through to form a hollowed-out pattern of the identification code, and the dark base layer 110 is not ablated. That is, the ablation depth of the hollowed-out pattern is the thickness of the metal layer 120. Then the hollowed-out pattern just exposes the unablated dark base layer 110, that is, the dark base layer 110 and the metal layer 120 form the identification code.

[0080] Second, while burning through the metal layer 120 to form the hollowed-out pattern of the identification code, part of the dark base layer 110 is also ablated, that is, the dark base layer 110 is partially ablated but not completely ablated. Therefore, after the ablation of the identification code is completed, the hollowed-out pattern can also expose the dark base layer 110, so that the dark base layer 110 and the metal layer 120 form the identification code. Specifically, the metal layer 120 is burned through to form a hollowed-out pattern, and a groove pattern (not marked in the figure) is formed on the side of the dark base layer 110 close to the metal layer 120. The vertical projection of the hollowed-out pattern on the plane where the dark base layer 110 is located completely coincides with the groove pattern. The side of the dark base layer 110 close to the metal layer 120 is ablated to form a groove pattern, and because the above groove pattern and the hollowed-out pattern are formed through one process, the vertical projection of the hollowed-out pattern on the plane where the dark base layer 110 is located completely coincides with the groove pattern.

[0081] Further, referring to Figure 3 , on the basis of the above embodiments, the film provided in this embodiment further includes a protective layer 140, and the protective layer 140 is disposed on the side of the adhesive layer 130 away from the dark base layer 110. The film of this embodiment includes the technical features of the protective layer 140 provided in any embodiment of the present invention and has the beneficial effects of the protective layer 140 provided in any embodiment of the present invention.

[0082] Further, referring to Figure 4 , on the basis of the above embodiments, the film provided in this embodiment further includes a low-adhesion film 150; the low-adhesion film 150 is used to provide protection and support for the metal layer 120. When forming the hollowed-out pattern of the identification code on the metal layer 120, the low-adhesion film 150 needs to be removed and the effect of no residual glue on the metal layer 120 is achieved. Optionally, the low-adhesion film 150 can be a silicone film. The film of this embodiment includes the technical features of the low-adhesion film 150 provided in any embodiment of the present invention and has the beneficial effects of the low-adhesion film 150 provided in any embodiment of the present invention.

[0083] On the basis of the above embodiments, an embodiment of the present invention further provides a circuit board, as Figure 5 shown, Figure 5 is a schematic structural diagram of a circuit board provided by an embodiment of the present invention. The circuit board includes a printed circuit board 2 and the film 1 provided in any one of the embodiments of the present invention; after removing the protective layer of the film 1, one side of the adhesive layer of the film 1 is attached to the printed circuit board 2. The circuit board of this embodiment includes the technical features of the film provided in any embodiment of the present invention and has the beneficial effects of the film provided in any embodiment of the present invention.

[0084] A large number of components with different functions are integrated on the printed circuit board 2. In this embodiment, identification codes of the components can be set at positions corresponding to the components on the film 1.

[0085] It can be understood that the embodiments of the present invention further provide an electronic device, which includes a circuit board provided by the above embodiments. The electronic device provided by the embodiments of the present invention can be a computer, a television, a smart wearable device, etc., and the embodiments of the present invention do not make special limitations thereto.

[0086] Based on the above embodiments, the embodiments of the present invention further provide a circuit board, as Figure 6 shown, Figure 6 is a schematic structural diagram of a circuit board provided by the embodiments of the present invention. The circuit board includes a printed circuit board 2, an electromagnetic shielding film 3, and the film 1 provided by any one of the embodiments of the present invention; after removing the protective layer of the film 1, one side of the adhesive layer of the film 1 is attached to the printed circuit board 2. The circuit board in this embodiment includes the technical features of the film provided by any embodiment of the present invention and has the beneficial effects of the film provided by any embodiment of the present invention.

[0087] A large number of components with different functions are integrated on the printed circuit board 2. In this embodiment, identification codes of the components can be set at positions on the film 1 corresponding to the components. The electromagnetic shielding film 3 can entirely cover the above-mentioned printed circuit board to achieve overall electromagnetic shielding. The electromagnetic shielding film 3 can also include multiple smaller sub-shielding films, and each sub-shielding film is used to cover the corresponding area of the printed circuit board. This embodiment does not make limitations thereto. In addition, the circuit board can first attach the electromagnetic shielding film 3 and then attach the film 1 provided by the above embodiments. Exemplarily, the identification code corresponding to the electronic device formed on the film 1 can be set in the edge area of the electromagnetic shielding film 3.

[0088] It can be understood that the embodiments of the present invention further provide an electronic device, which includes a circuit board provided by the above embodiments. The electronic device provided by the embodiments of the present invention can be a computer, a television, a smart wearable device, etc., and the embodiments of the present invention do not make special limitations thereto.

[0089] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A membrane, characterized in that, Comprising: A dark base layer; A metal layer located on one side of the dark base layer; Wherein, the gray value of the color of the dark base layer is less than the gray value of the color of the metal layer, the difference between the gray value of the color of the dark base layer and the gray value of the color of the metal layer is less than or equal to a first gray threshold, the first gray threshold is greater than or equal to 10, and the metal layer is used to form a hollowed-out pattern of an identification code so as to expose the dark base layer at a position corresponding to the hollowed-out pattern.

2. The membrane according to claim 1, wherein, Also comprising an adhesive layer; The adhesive layer is located on a side of the dark base layer away from the metal layer.

3. The membrane according to claim 2, wherein Also comprising a protective layer, which is arranged on a side of the adhesive layer away from the dark base layer.

4. The membrane according to claim 1, characterized in that, The first gray threshold is 50.

5. The membrane according to claim 1, characterized in that, The first gray threshold is 100.

6. The membrane according to claim 1, wherein The material of the metal layer is at least one single element among nickel, silver, platinum, titanium, aluminum and chromium; or, the material of the metal layer is an alloy formed by at least two of nickel, silver, platinum, titanium, aluminum and chromium, or, the material of the metal layer is a combination between alloys formed by at least two of nickel, silver, platinum, titanium, aluminum and chromium.

7. The membrane according to claim 2, wherein The thickness range of the metal layer is 0.05 - 5 μm, the thickness range of the dark base layer is 0.5 - 20 μm, and the thickness range of the adhesive layer is 1 - 30 μm.

8. The membrane according to claim 1, characterized in that, Also comprising a low-adhesion film, which is arranged on a side of the metal layer away from the dark base layer.

9. The membrane according to claim 1 or 8, characterized in that, The film also comprises a first film layer, which is arranged on a side of the metal layer away from the dark base layer.

10. The membrane according to claim 9, wherein The first film layer is a colorless adhesive layer.

11. A film, characterized in that, Comprising: A dark base layer; A metal layer located on one side of the dark base layer; An adhesive layer, which is located on a side of the dark base layer away from the metal layer; Wherein, the gray value of the color of the dark base layer is less than the gray value of the color of the metal layer, the difference between the gray value of the color of the dark base layer and the gray value of the color of the metal layer is less than or equal to a first gray threshold, the first gray threshold is greater than or equal to 10; the metal layer is used to form a hollowed-out pattern of an identification code so as to expose the dark base layer at a position corresponding to the hollowed-out pattern.

12. The membrane according to claim 11, wherein, A groove pattern is formed on a side of the dark base layer close to the metal layer, and the vertical projection of the hollowed-out pattern on the plane where the dark base layer is located completely coincides with the groove pattern.

13. The membrane according to claim 11, wherein The identification code comprises at least one of a bar code, a two-dimensional code and characters.

14. A circuit board, characterized in that, Comprising a printed circuit board and the film according to any one of claims 1 - 10; After removing the protective layer of the film, one side of the adhesive layer of the film is attached to the printed circuit board.

15. A circuit board, characterized in that, Comprising a printed circuit board, an electromagnetic shielding film and the film according to any one of claims 1 - 10, and the electromagnetic shielding film is arranged on the printed circuit board; After removing the protective layer of the film, one side of the adhesive layer of the film is attached to the printed circuit board.

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