Superhard gradient color mobile phone cover plate

Abstract

The utility model relates to a superhard gradient color mobile phone cover plate, which comprises a substrate, and an optical interference film layer, a DLC gradient film layer and an AF functional film layer which are sequentially laminated on the surface of the substrate, the optical interference film layer is formed by alternately stacking at least two inorganic materials of which the refractive index difference is greater than 0.5, and the total thickness is 500-1000nm; the DLC gradient film layer is in stepped density distribution in the thickness direction, and the Vickers hardness HV of the DLC gradient film layer is larger than or equal to 3000. The surface contact angle of the AF functional film layer is larger than or equal to 110 degrees. According to the novel super-hard gradient color mobile phone cover plate, the surface of the mobile phone cover plate is plated with multiple layers of films, the color effect is obtained through interference of light of materials with different refractive indexes, and meanwhile the surface of the mobile phone cover plate is plated with the DLC film layer and the AF film layer, so that the mobile phone cover plate has the advantages of being super-hard and gradient in color. The mobile phone cover plate provided by the utility model has a superhard characteristic, can effectively protect a mobile phone screen, and prolongs the service life of a mobile phone.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of cover plate, specifically, relates to a superhard gradual change color mobile phone cover plate. BACKGROUND

[0002] With the continuous development of science and technology, mobile phones have become an indispensable part of people's lives. The requirements for mobile phone cover plates are also getting higher and higher. Not only do they need to have good hardness to protect the mobile phone screen, but they also expect to have unique appearance effects. The current mobile phone cover plates still have room for improvement in terms of hardness and appearance diversity. INVENTION CONTENTS

[0003] The utility model aims at providing a superhard gradual change color mobile phone cover plate to solve some technical problems in the prior art.

[0004] Specifically, the utility model discloses the following technical scheme: a superhard gradual change color mobile phone cover plate, including the substrate and the optical interference film layer, DLC gradient film layer and AF function film layer that are sequentially stacked on the surface of the substrate, the optical interference film layer is alternately stacked by at least two inorganic materials with a refractive index difference greater than 0.5, the total thickness is 500-1000nm, the DLC gradient film layer presents a stepped density distribution along the thickness direction, and the Vickers hardness HV is greater than or equal to 3000, and the contact angle of the surface of the AF function film layer is greater than or equal to 110 degrees.

[0005] As a preferred technical scheme, the optical interference film layer comprises an alternating structure of a high-refractive-index material film layer and a low-refractive-index material film layer, wherein the high-refractive-index material is selected from at least one of TiO2, Nb2O5 and Si3N4, and the low-refractive-index material is selected from at least one of SiO2, MgF2 and Al2O3.

[0006] As a preferred technical scheme, the single-layer thickness of the high-refractive-index material layer is 50-100nm, the single-layer thickness of the low-refractive-index material layer is 40-80nm, and the thickness ratio of the high-refractive-index material layer to the low-refractive-index material layer is (1.2-2.5):1.

[0007] As a preferred technical scheme, the thickness of each sublayer of the DLC gradient film layer is distributed in an arithmetic sequence, the tolerance is 30-50nm, and the total thickness is controlled in the range of 200-500nm.

[0008] As a preferred technical scheme, the AF function film layer is a fluorine-containing silane compound film, the surface energy thereof is less than or equal to 15mN / m, and the content of fluorine element in the film layer is gradiently distributed along the thickness direction.

[0009] As a preferred technical scheme, a transition layer is arranged between the optical interference film layer and the DLC gradient film layer, and the transition layer is a SiOxCy gradient layer, wherein x gradually changes from 1.5 to 0.8, and y gradually changes from 0 to 0.2.

[0010] As a preferred technical solution, the AF functional film layer surface is provided with a micro-nano composite structure, which comprises a nano-grating with a period of 200-500 nm and a micro-pit array with a depth of 50-150 nm.

[0011] As a preferred technical solution, the optical interference film layer comprises at least one pair of λ / 4 optical thickness matching layers, and the optical thickness satisfies (n1d1+n2d2)=mλ / 4, wherein m is an odd number, and λ=450-650 nm.

[0012] As a preferred technical solution, the surface roughness Ra of the DLC gradient film layer is ≤5 nm, and a chemical bonding interface is formed between the AF functional film layer, and the C-F bond energy at the interface is ≥685 eV.

[0013] As a preferred technical solution, the substrate is a glass cover plate.

[0014] The beneficial effect of the present application is: the novel super-hard gradient color mobile phone cover plate is provided, a plurality of film layers are plated on the surface of the mobile phone cover plate, color effects are obtained by light interference of different refractive materials, and the surface is plated with a DLC film layer and an AF film layer, so that the mobile phone cover plate has the characteristics of super hardness and gradient color. The mobile phone cover plate has the characteristics of super hardness, can effectively protect the mobile phone screen, and prolongs the service life of the mobile phone. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0016] Figure 1 A stacking structure schematic diagram of the super-hard gradient color mobile phone cover plate is provided for the embodiments of the present application.

[0017] Marked with reference numerals: cover plate 1; high refractive index material film layer 2; low refractive index material film layer 3; DLC gradient film layer 4; AF functional film layer 5. DETAILED DESCRIPTION

[0018] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations, however, can be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the scope of example implementations to those skilled in the art.

[0019] Moreover, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the application can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the application.

[0020] The block diagrams shown in the drawings are functional entities, not necessarily corresponding to physically independent entities. That is, the functional entities can be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0021] The flowcharts shown in the drawings are only illustrative, not necessarily including all contents and operations / steps, and not necessarily executed in the order described. For example, some operations / steps can be further decomposed, and some operations / steps can be combined or partially combined, so the actual execution order can be changed according to actual conditions.

[0022] It should be noted that "multiple" as mentioned herein refers to two or more.

[0023] Embodiments

[0024] As Figure 1 shown, a superhard gradient color mobile phone cover plate 1 proposed in the present example includes a substrate and, in order, an optical interference film layer, a DLC gradient film layer 4 (diamond-like carbon, a thin film with absorption, different thicknesses absorb different colors) and an AF functional film layer 5 laminated on the surface of the substrate; the optical interference film layer is composed of at least two inorganic materials with a refractive index difference greater than 0.5 alternately stacked, with a total thickness of 500-1000 nm; the DLC gradient film layer 4 presents a stepped density distribution along the thickness direction, with a Vickers hardness HV≥3000; the AF functional film layer 5 has a surface contact angle≥110°.

[0025] A multi-layer film is plated on the surface of the mobile phone cover plate 1 using physical vapor deposition (PVD) or chemical vapor deposition (CVD) technology, etc. The film is composed of at least two materials with different refractive indices, including a high refractive index material film layer 2 and a low refractive index material film layer 3. Through the interference of light, rich color effects are produced, meeting the individualized needs of users for the appearance of mobile phones.

[0026] Preferably, the optical interference film layer comprises an alternating structure of high refractive index material film layer 2 and low refractive index material film layer 3, wherein the high refractive index material is selected from at least one of TiO2, Nb2O5, Si3N4, and the low refractive index material is selected from at least one of SiO2, MgF2, Al2O3.

[0027] Preferably, the single-layer thickness of the high refractive index material layer is 50-100 nm, and the single-layer thickness of the low refractive index material layer is 40-80 nm, and the thickness ratio of the high and low refractive index material layers is (1.2-2.5):1.

[0028] Preferably, the thicknesses of the sub-layers of the DLC gradient film layer 4 are distributed in an arithmetic sequence, with a tolerance of 30-50 nm, and the total thickness is controlled in the range of 200-500 nm.

[0029] Preferably, the AF functional film layer 5 is a fluorine-containing silane compound film, with a surface energy ≤15 mN / m, and the content of fluorine element in the film layer is gradiently distributed along the thickness direction.

[0030] Preferably, a transition layer is arranged between the optical interference film layer and the DLC gradient film layer 4, and the transition layer is a SiOxCy gradient layer, wherein x gradually changes from 1.5 to 0.8, and y gradually changes from 0 to 0.2.

[0031] Preferably, the surface of the AF functional film layer 5 is provided with a micro-nano composite structure, comprising a nano-grating with a period of 200-500 nm and a micro-pit array with a depth of 50-150 nm.

[0032] Preferably, the optical interference film layer comprises at least one pair of λ / 4 optical thickness matching layers, and the optical thickness satisfies (n1d1+n2d2)=mλ / 4, wherein m is an odd number, and λ=450-650 nm.

[0033] Preferably, the surface roughness Ra of the DLC gradient film layer 4 is ≤5 nm, and a chemical bonding interface is formed between the DLC gradient film layer 4 and the AF functional film layer 5, and the C-F bond energy at the interface is ≥685 eV.

[0034] Further, the substrate is a glass cover plate 1.

[0035] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application, and it should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A super-hard gradient color mobile phone cover, characterized in that, The invention includes a substrate and an optical interference film, a DLC gradient film, and an AF functional film, which are sequentially stacked on the surface of the substrate. The optical interference film is composed of at least two inorganic materials with a refractive index difference greater than 0.5 stacked alternately, with a total thickness of 500-1000 nm. The DLC gradient film exhibits a stepped density distribution along the thickness direction, and its Vickers hardness HV≥3000. The AF functional film has a surface contact angle ≥110°.

2. The mobile phone cover plate according to claim 1, characterized in that, The optical interference film comprises an alternating structure of high refractive index material film and low refractive index material film, wherein the high refractive index material is selected from at least one of TiO2, Nb2O5, and Si3N4, and the low refractive index material is selected from at least one of SiO2, MgF2, and Al2O3.

3. The mobile phone cover plate according to claim 2, characterized in that, The thickness of the high refractive index material layer is 50-100 nm, the thickness of the low refractive index material layer is 40-80 nm, and the thickness ratio of the high and low refractive index material layers is (1.2-2.5):

1.

4. The mobile phone cover plate according to claim 3, characterized in that, The thickness of each sublayer of the DLC gradient film is distributed in an arithmetic sequence with a tolerance of 30-50 nm, and the total thickness is controlled within the range of 200-500 nm.

5. The mobile phone cover plate according to claim 1, characterized in that, The AF functional membrane is a fluorinated silane compound membrane with a surface energy ≤15mN / m and a gradient distribution of fluorine content along the thickness direction.

6. The mobile phone cover plate according to claim 1, characterized in that, A transition layer is provided between the optical interference film and the DLC gradient film. This transition layer is a SiOxCy gradient layer, in which x gradually changes from 1.5 to 0.8 and y gradually changes from 0 to 0.

2.

7. The mobile phone cover plate according to claim 1, characterized in that, The surface of the AF functional film layer is provided with a micro-nano composite structure, which includes a nanograting with a period of 200-500nm and a micro-pit array with a depth of 50-150nm.

8. The mobile phone cover plate according to claim 1, characterized in that, The optical interference film layer includes at least one pair of λ / 4 optical thickness matching layers, whose optical thicknesses satisfy (n1d1+n2d2)=mλ / 4, where m is an odd number and λ=450-650nm.

9. The mobile phone cover plate according to claim 1, characterized in that, The surface roughness Ra of the DLC gradient film is ≤5nm, and a chemical bonding interface is formed between it and the AF functional film, with a CF bond binding energy ≥685eV at the interface.

10. The mobile phone cover according to any one of claims 1-9, characterized in that, The substrate is a glass cover plate.

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