Method for arranging color-mixed PVD (Physical Vapor Deposition) layer on surface of base material, decorative material and electronic product

Abstract

The invention discloses a method for arranging a mixed color PVD layer on the surface of a base material, which comprises the following steps of: performing material reduction treatment on partial area of the surface of the base material treated by a PVD process until the base material is exposed, and when the PVD process treatment is performed again, forming the PVD layer on the whole exposed surface of the base material, namely filling the PVD layer into a groove or a gap after the material reduction treatment. And then the PVD coloring layer formed by the first PVD process is exposed through subsequent material reduction treatment, so that two different PVD coloring layers are formed on the surface of the base material, and the product has the characteristics of high hardness, high wear resistance (low friction coefficient), good corrosion resistance, good chemical stability and the like of a PVD film layer, and meanwhile, the appearance expressive force of the product is improved; and the distribution of different functional areas can meet the use expectation of more application scenes.

Description

Technical Field

[0001] The present application relates to the technical field of decorative materials, and in particular to a method for arranging a mixed-color PVD layer on a substrate surface, a decorative material, and an electronic product. Background Art

[0002] PVD is the abbreviation of Physical Vapor Deposition, which means "physical vapor deposition" in Chinese. It refers to the thin film preparation technology that uses physical methods to deposit materials on the workpiece to be plated under vacuum conditions. The film layer plated using PVD coating technology has the characteristics of high hardness, high wear resistance (low friction coefficient), good corrosion resistance and chemical stability, and the film layer has a longer life; at the same time, the film layer can greatly improve the appearance and decorative performance of the workpiece. Therefore, PVD is widely used in electronics, optics, automobiles and other industries.

[0003] However, PVD treatment of conventional metal parts will achieve a full coverage single color effect, with a single color and limited color expression, which has an adverse impact on the diversity of decorative materials. Summary of the invention

[0004] The purpose of the embodiment of the present invention is to provide a method for setting a mixed color PVD layer on the surface of a substrate, which can form thin film layers of different colors on a metal material through a PVD process, while retaining the high hardness, high wear resistance, corrosion resistance and chemical performance temperature of the PVD process coating, while enhancing its color expression.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] In one aspect, a method for providing a mixed color PVD layer on a substrate surface is provided, comprising:

[0007] Step 1, providing a substrate to be processed;

[0008] Step 2, forming a PVD coloring layer on the surface of the substrate by a PVD process;

[0009] Step 3, performing a subtractive material treatment on a portion of the product coated with the PVD coloring layer until the substrate of the corresponding area is exposed;

[0010] Step 4, forming a new PVD coloring layer on the surface of the material after the subtractive material treatment by a PVD process, and the PVD coloring layers formed by the two PVD processes have different colors;

[0011] Step 5, repeating steps 3 and 4 until a required number of PVD coloring layers are formed;

[0012] Step 6, performing subtractive material processing on the product that has completed all PVD processes to expose all PVD coloring layers.

[0013] Optionally, the method further includes forming a process isolation layer between two adjacent PVD coloring layers.

[0014] Optionally, the process isolation layer is formed by an electrophoresis process, a spraying process or a printing process.

[0015] Optionally, the subtractive material processing is performed by CNC machining or laser engraving.

[0016] Optionally, the PVD process is performed using metal materials, alloy materials, ceramic materials or carbon-based materials.

[0017] Optionally, the substrate is a metal material, a glass material, a plastic, a semiconductor, a ceramic or a ceramic coating material.

[0018] Optionally, the substrate is surface cleaned before the first PVD coloring layer is set.

[0019] Optionally, in the subtractive material treatment described in step 6, the material is reduced to the process isolation layer, and then a paint stripping treatment is performed to expose all of the PVD coloring layer.

[0020] Optionally, in the subtractive material processing described in step 6, the material is reduced to the PVD coloring layer to expose all of the PVD coloring layer.

[0021] Optionally, after all the PVD coloring layers are exposed, the entire product is subjected to AF protection treatment.

[0022] Optionally, the entire product is subjected to surface treatment before the AF protection treatment, and the surface treatment includes annealing, cooling and cleaning.

[0023] On the other hand, a decorative material is provided, comprising a substrate and a surface adhesion layer, wherein the surface adhesion layer is processed on the surface of the substrate by using the method of providing a mixed color PVD layer on the surface of the substrate as described above.

[0024] On the other hand, an electronic product is provided, wherein the appearance part is made of the decorative material as described above.

[0025] The beneficial effects of the present application are as follows: by performing subtractive material treatment on a partial area of ​​the surface of the substrate after PVD process treatment until the substrate is exposed, when the PVD process is performed again, a PVD layer is formed on the entire exposed surface of the substrate, that is, the PVD layer will fill the grooves or gaps after the subtractive material treatment, and then through the subsequent subtractive material treatment, the PVD coloring layer formed by the first PVD process is exposed, thereby forming two different PVD coloring layers on the surface of the substrate, so that the product has the characteristics of high hardness, high wear resistance (low friction coefficient), good corrosion resistance and chemical stability of the PVD film layer, while improving its appearance expression, as well as the distribution of different functional areas, which can meet the usage expectations of more application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present application is further described in detail below based on the drawings and embodiments.

[0027] Figure 1 This is a flow chart of a method for providing a mixed-color PVD layer on the surface of a substrate described in an embodiment of the present application.

[0028] Figure 2 This is a schematic diagram of the structure of providing a first PVD coloring layer on the surface of a substrate as described in an embodiment of the present application.

[0029] Figure 3 This is a schematic diagram of the structure after a process isolation layer is provided outside the first PVD coloring layer.

[0030] Figure 4 For Figure 3 Schematic diagram of the structure after material reduction treatment is performed on some areas of the structure shown.

[0031] Figure 5 For Figure 4 Schematic diagram of the structure after the second PVD coloring layer is set on the structure.

[0032] Figure 6 For Figure 5 Schematic diagram of the structure in which a portion of the process isolation layer is retained after material reduction processing is performed on the structure shown.

[0033] Figure 7 for Figure 6 The structure shown is a schematic diagram of the structure after paint stripping and removal of the process isolation layer.

[0034] Figure 8 for Figure 7 Schematic diagram of the structure after an AF protective layer is set on the structure shown.

[0035] In the figure:

[0036] 100, substrate; 200, first PVD coloring layer; 300, process isolation layer; 400, second PVD coloring layer; 500, AF protective layer. DETAILED DESCRIPTION

[0037] In order to make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0038] In the description of this application, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] Physical Vapor Deposition (PVD) is a thin film deposition technique widely used in industries such as electronics, optics and automotive. It deposits materials onto a surface through a physical process such as evaporation or sputtering. PVD is often used to create coatings with desirable properties such as hardness, wear resistance or reflectivity.

[0041] However, since physical vapor deposition targets the entire product surface, the product color obtained by physical vapor deposition in the prior art is single, and it is difficult to meet the demand for diversified product colors.

[0042] The present application provides a method for setting a mixed-color PVD layer on the surface of a substrate, which coats the substrate surface with a coating by physical vapor deposition (Physical Vapor Deposition) in combination with a subtractive material processing method, thereby achieving a coating structure in which multiple PVD layers are formed in different areas on the same product surface.

[0043] It can be understood that the coating structure of the multiple PVD layers described in this scheme can be a PVD layer forming different colors to enhance the appearance, or it can be a PVD layer forming different physical properties. For example, the PVD layer in some areas has better wear resistance, while the PVD layer in some areas has stronger reflective properties, etc.

[0044] At the same time, the PVD layer distribution in this scheme can be a continuous distribution of areas with the same color or the same physical properties, forming several large areas with the same color and physical properties, or it can be an intermittent distribution of areas with the same color or physical properties, forming several staggered areas, so as to meet the use requirements of different products.

[0045] Specifically, Figure 1 As shown, the method for providing a mixed color PVD layer on the surface of a substrate according to an embodiment of the present application specifically includes:

[0046] Step 1, providing a substrate to be processed;

[0047] Step 2, forming a PVD coloring layer on the surface of the substrate by a PVD process;

[0048] Step 3, performing a subtractive material treatment on a portion of the product coated with the PVD coloring layer until the substrate of the corresponding area is exposed;

[0049] Step 4, forming a new PVD coloring layer on the surface of the material after the subtractive material treatment by a PVD process, and the PVD coloring layers formed by the two PVD processes have different colors;

[0050] Step 5, repeating steps 3 and 4 until a required number of PVD coloring layers are formed;

[0051] Step 6, performing subtractive material processing on the product that has completed all PVD processes to expose all PVD coloring layers.

[0052] It can be understood that step 5 is an optional step to be performed as needed. When two PVD processes are required, all PVD processes are completed after step 4 is completed, and step 6 can be performed directly. When three or more PVD processes are required, step 5 needs to be performed according to the number of PVD processes. Step 5 can be performed once or repeatedly until all PVD processes are completed.

[0053] In this embodiment, subtractive material treatment is performed on a partial area of ​​the surface of the substrate after the PVD process until the substrate is exposed. When the PVD process is performed again, a PVD layer is formed on the entire exposed surface of the substrate, that is, the PVD layer will fill the grooves or gaps after the subtractive material treatment, and then the PVD coloring layer formed by the first PVD process is exposed through the subsequent subtractive material treatment. Thus, two different PVD coloring layers are formed on the surface of the substrate, so that the product has the characteristics of high hardness, high wear resistance (low friction coefficient), good corrosion resistance and chemical stability of the PVD film layer, while improving its appearance expression and the distribution of different functional areas, which can meet the usage expectations of more application scenarios.

[0054] In the embodiment of the present application, a process isolation layer is optionally formed between two adjacent PVD coloring layers. The function of the process isolation layer is to be arranged between the PVD coloring layers to prevent the two PVD coloring layers from directly contacting each other when they are stacked together, which makes it difficult to remove the upper PVD coloring layer and expose the bottom PVD coloring layer.

[0055] Optionally, the process isolation layer is formed by an electrophoresis process, a spraying process or a printing process. By setting a process isolation layer and ensuring that the process isolation layer is easily removed by chemical means without affecting the PVD coloring layer, the stacked PVD coloring layers can be made to not interfere with each other, and when the upper PVD coloring layer is removed by a subtractive material process, the lower PVD coloring layer will not be damaged, thereby ensuring the surface quality of the final product.

[0056] In this embodiment, the electrophoresis process is adopted, and the process isolation layer formed by the electrophoresis process plays a key role in the connection process, which can well ensure that the previous PVD coloring layer is not disturbed by the next PVD coloring layer.

[0057] It should be pointed out that this solution requires requirements for the materials of the electrophoretic process, which needs to prevent the relevant solvents from affecting the PVD coloring layer during the subsequent paint stripping process.

[0058] Among them, the electrophoresis process is a coating technology that forms a coating by depositing charged coating particles on the surface of a workpiece under the action of an electric field, the spraying process is a coating technology that sprays paint or pigment onto the surface of an object through a spray gun, and the printing process is a technology that transfers ink or ink to the surface of a workpiece through a printing plate. The above processes are all technical means commonly used by those skilled in the art and will not be described in detail in this application.

[0059] The subtractive material processing described in this application is a processing process in which the material attached to the surface of the substrate is partially removed by CNC machining or laser engraving to expose the PVD coloring layer or the substrate. This process can be performed on a partial area of ​​the product surface.

[0060] The subtractive material treatment, when there is a process isolation layer, reduces the material to the process isolation layer, and then performs paint stripping to expose all of the PVD coloring layer. When no process isolation layer is set, the PVD coloring layer is directly exposed through the subtractive material treatment.

[0061] It should be pointed out that the product described in this scheme is a general term for structures after various coatings are attached to the surface of the substrate. It may refer to a structure after a PVD coloring layer is provided on the surface of the substrate, or it may refer to a structure after a PVD coloring layer is attached to the surface of the substrate and then a process isolation layer is provided. The specific structure can be judged based on the description content.

[0062] The PVD process described in the present application may be performed using metal materials, alloy materials, ceramic materials or carbon-based materials, and the substrate may be metal materials, glass materials, plastics, semiconductors, ceramics or ceramic coating materials.

[0063] In order to ensure the effect of the PVD coloring layer, the present solution also performs surface cleaning on the substrate before the first PVD coloring layer is set.

[0064] In an optional embodiment of the present application, the entire product is subjected to AF protection treatment after all the PVD coloring layers are exposed.

[0065] AF protection treatment is a surface treatment technology used to protect the appearance and performance of metal surfaces. AF is the abbreviation of "Anti-Fingerprint", which means anti-fingerprint. The purpose of AF protection treatment is to form a thin and transparent coating on the metal surface to reduce the adhesion of fingerprints, grease and other stains on the surface and improve the anti-scratch performance.

[0066] Optionally, the entire product is subjected to surface treatment before the AF protection treatment, and the surface treatment includes annealing, cooling and cleaning. Annealing and cooling are common process steps in metal processing and heat treatment. Annealing refers to the process of heating a metal material to a certain temperature and then slowly cooling it. Its purpose is to change the structure and properties of the material by controlling the temperature and cooling rate to eliminate stress, improve the plasticity and toughness of the material, and improve the size and arrangement of the grains. Annealing can generally be divided into the following types:

[0067] Full annealing: The material is heated to a sufficiently high temperature, and then slowly cooled to room temperature after keeping it warm for a period of time. This type of annealing can achieve the best softening and recrystallization effect of the material.

[0068] Partial annealing (half annealing): The material is heated to a temperature range between the full annealing temperature and the recrystallization temperature, and then cooled after being kept at this temperature for a certain period of time. This type of annealing can improve the toughness and plasticity of the material, but the grains will not be completely recrystallized.

[0069] Isothermal annealing: The material is heated to the annealing temperature and kept at this temperature for a period of time to achieve grain recrystallization and improvement of material properties. Then it is slowly cooled to room temperature.

[0070] Cooling is the process of rapidly reducing the temperature of a material from a high temperature state. Cooling can be achieved by a variety of methods, including natural cooling, water quenching, oil quenching, and air cooling. The purpose of cooling is to quickly change the structure of the material to adjust its properties and hardness.

[0071] Annealing and cooling are widely used in metal processing and heat treatment to improve the machinability of materials, reduce stress, improve hardness, etc. The specific annealing and cooling process parameters (such as temperature, time and cooling rate) will vary according to factors such as the type, shape and application requirements of the material. Those skilled in the art can make reasonable choices based on the characteristics of the actual materials used, and they will not be described in detail in this application.

[0072] The following is combined with Figure 2-8 As shown, taking the case of setting two PVD coloring layers on the surface of the metal substrate 100 as an example, the method of setting a mixed color PVD layer on the surface of the substrate 100 is described in detail:

[0073] First, stainless steel is provided as a substrate 100, and the surface of the stainless steel is cleaned to ensure its surface cleanliness and smoothness;

[0074] Provide brass as a PVD material, prepare it into a solid target, usually in a disc or rectangular shape, use a magnetron sputtering device, ensure that the device is in a proper vacuum environment, place the stainless steel substrate 100 and the brass in the device, set the deposition parameters to 100-150 degrees Celsius, set the device power to 150 watts, use argon as an inert gas during the deposition process, the flow rate of argon is used to maintain the vacuum environment and perform ion bombardment, adjust the distance between the stainless steel substrate 100 and the PVD material to control the thickness and uniformity of the deposited film, set the deposition time to 10-20 minutes, and form a copper PVD layer of a preset thickness on the surface of the stainless steel substrate 100. Figure 2 As shown, the first PVD coloring layer 200 is attached and the first PVD coloring layer 200 is golden.

[0075] After the first PVD coloring layer 200 is attached, a process isolation layer 300 is set on the product surface. Figure 3As shown, in this embodiment, the process isolation layer 300 is formed by an electrophoretic process. Specifically, the product is first cleaned and surface treated, including steps such as removing grease, rust and dirt to ensure that the surface is well prepared. Prepare a paint tank: select a tank material made of stainless steel, prepare a solvent in the tank, add cyclopolyamide resin to the electrophoretic paint solution to form an electrophoretic solution, and then hang the product in the electrophoretic tank to ensure the conductive connection between the product and the paint tank, and keep adjacent products at a certain distance to avoid short circuits between products. Apply a DC voltage or an AC electric field of 100-200 volts for 2-5 minutes of electrophoretic coating to charge the particles in the coating solution and move to the surface of the workpiece. The coating particles adhere to the surface of the workpiece under the action of the electric field to form a coating. The coated workpiece is sent to a curing furnace or subjected to other appropriate curing treatments to form a solid protective layer on the surface of the coating. The workpiece to be coated is cooled and quality inspected, including inspection of parameters such as coating thickness, appearance and adhesion.

[0076] After completing the electrophoresis process and setting the process isolation layer 300, the product is laser engraved, refer to Figure 4 As shown, in some areas of the product, the material is reduced until the stainless steel substrate 100 is exposed, and then the PVD process is performed again. Titanium (Ti) is used as the PVD layer material and deposited for 10-20 minutes at 150-200 degrees Celsius to form a blue PVD film layer as a reference for the second PVD coloring layer. Figure 5 shown.

[0077] Refer to later Figure 6 As shown, the area with three layers of process, namely, the first PVD coloring layer 200, the process isolation layer 300 formed by the electrophoretic coating, and the second PVD coloring layer 400, is laser engraved, and the laser engraving parameters are controlled to penetrate to the middle of the electrophoretic coating, but the electrophoretic coating cannot be penetrated to damage the first PVD coloring layer.

[0078] Refer to Figure 7 As shown, the product is stripped to remove the electrophoretic layer and other residual substances thereon. The stripping treatment uses toluene, alcohol solvents (such as ethanol, isopropanol) or acetone, etc., which can better dissolve the cyclopolyamide resin electrophoretic coating. During the stripping process, the substrate 100 is immersed in a suitable organic solvent to soften and dissolve the electrophoretic coating, and then the coating is removed by brushing, rinsing, etc.

[0079] It should be pointed out that in the present scheme, when laser engraving is performed on an area having three layers of processes, namely, a first PVD coloring layer 200, a process isolation layer 300 formed by an electrophoretic coating, and a second PVD coloring layer 400, and the laser engraving parameters are controlled to penetrate to the middle of the electrophoretic coating, a residual second PVD coloring layer will be formed on a partial area of ​​the product surface (the inner peripheral area where the groove is formed by the first laser engraving). The height of the second PVD coloring layer in this partial area is higher than that of the first PVD coloring layer, resulting in an uneven surface of the product. This unevenness is covered and smoothed by the protective layer during the subsequent AF protection treatment, and therefore will not affect the final appearance of the product.

[0080] Reference Figure 8 As shown, the product is subjected to overall AF protection treatment to form an AF protective layer 500, and an AF protective coating is provided and uniformly coated on the surface of the product. The choice of coating depends on the desired performance and appearance effect, and can be an organic coating or an inorganic coating. The AF protective coating coated on the surface of the product is dried and cured, and the drying and curing treatment can be achieved by natural drying or using an oven, ultraviolet curing, and the like.

[0081] Inspection and quality control: The treated product surface is inspected to ensure that the quality and performance of the coating meet the requirements. This can include thickness measurement of the coating, abrasion resistance testing, fingerprint resistance testing, etc.

[0082] Meanwhile, a decorative material is also provided in this embodiment, including a substrate 100 and a surface adhesion layer, wherein the surface adhesion layer is processed on the surface of the substrate 100 by using the method of providing a mixed color PVD layer on the surface of the substrate 100 as described above.

[0083] The embodiment of the present application also provides an electronic product, which uses the decorative material as described above to make the appearance part. In the description of this article, it should be understood that the terms "upper", "lower", "left", "right", and other directions or positional relationships are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0084] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0085] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0086] The technical principles of the present application are described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present application and cannot be interpreted as limiting the scope of protection of the present application in any way. Based on the explanations herein, those skilled in the art can think of other specific implementation methods of the present application without creative work, and these methods will fall within the scope of protection of the present application.

Claims

1. A method for providing a mixed color PVD layer on a substrate surface, characterized in that: include: Step 1, providing a substrate to be processed; Step 2, forming a PVD coloring layer on the surface of the substrate by a PVD process; Step 3, performing a subtractive material treatment on a portion of the product coated with the PVD coloring layer until the substrate of the corresponding area is exposed; Step 4, forming a new PVD coloring layer on the surface of the material after the subtractive material treatment by a PVD process, and the PVD coloring layers formed by the two PVD processes have different colors; Step 5, repeating steps 3 and 4 until a required number of PVD coloring layers are formed; Step 6, performing subtractive material processing on the product that has completed all PVD processes to expose all PVD coloring layers.

2. The method for providing a mixed color PVD layer on a substrate surface according to claim 1, characterized in that: The method also includes forming a process isolation layer between two adjacent PVD coloring layers.

3. The method for providing a mixed color PVD layer on a substrate surface according to claim 2, characterized in that: The process isolation layer is formed by electrophoresis process, spraying process or printing process.

4. The method for providing a mixed color PVD layer on a substrate surface according to claim 1, characterized in that: The subtractive material processing is performed by CNC machining or laser engraving.

5. The method for providing a mixed color PVD layer on a substrate surface according to claim 1, characterized in that: The PVD process is performed using metal materials, alloy materials, ceramic materials or carbon-based materials.

6. The method for providing a mixed color PVD layer on a substrate surface according to claim 1, characterized in that: The substrate is a metal material, a glass material, a plastic, a semiconductor, a ceramic or a ceramic coating material.

7. The method for providing a mixed color PVD layer on a substrate surface according to claim 1, characterized in that: Before the first PVD coloring layer is set, the substrate surface is cleaned.

8. The method for providing a mixed color PVD layer on a substrate surface according to claim 2, characterized in that: In the subtractive material treatment described in step 6, the material is reduced to the process isolation layer, and then the paint stripping treatment is performed to expose all of the PVD coloring layer.

9. The method for providing a mixed color PVD layer on a substrate surface according to claim 2, characterized in that: In the subtractive material processing described in step 6, the material is reduced to the PVD color layer to expose all of the PVD color layer.

10. The method for providing a mixed color PVD layer on a substrate surface according to claim 8 or 9, characterized in that: After all the PVD coloring layers are exposed, the entire product is subjected to AF protection treatment.

11. The method for providing a mixed color PVD layer on a substrate surface according to claim 10, characterized in that: Before the AF protection treatment, the entire product is subjected to surface treatment, and the surface treatment includes annealing, cooling and cleaning.

12. A decorative material, characterized in that: The invention comprises a substrate and a surface adhesion layer, wherein the surface adhesion layer is processed on the surface of the substrate by adopting the method of arranging a mixed color PVD layer on the surface of the substrate according to any one of claims 1 to 9.

13. An electronic product, characterized in that: The decorative material according to claim 12 is used to make the appearance part.

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