Membrane structure

Abstract

The present invention relates to a film system structure, comprising a substrate (1) and a film group (2) plated on the substrate (1), wherein the film group (2) comprises a high-refractive-index film layer (21), a low-refractive-index film layer (22), and a metal film layer (23). The metal film layer of the present invention can ensure the reflectivity and reliability of the film system structure composed of the metal film layer.

Description

Technical Field

[0001] The invention relates to a film system structure. Background Art

[0002] Highly reflective products are used in the fields of automotive, drones, optical communications, etc., and metal high-reflective films are often used in such products. Existing metal high-reflective films are generally made of pure metal materials, and their characteristics are that the higher the reflectivity, the worse the reliability. On the contrary, the higher the reliability, the lower the reflectivity. Therefore, there is a greater risk of demolding in existing metal high-reflective films, especially in the white grid film strength test and the 2-hour boiling water test. Demolding is prone to occur. The conventional automotive-grade reliability time requirement is very long, generally needing to meet 1000H. It can be seen that the demolding risk of existing metal films seriously hinders their mass use. Summary of the Invention

[0003] The object of the present invention is to provide a film structure.

[0004] To achieve the above-mentioned object of the invention, the present invention provides a film system structure, including a substrate and a film group coated on the substrate, wherein the film group includes a high refractive index film layer, a low refractive index film layer and a metal film layer.

[0005] According to one aspect of the present invention, in the film set, the low refractive index film layers and the high refractive index film layers are arranged alternately;

[0006] The metal film layer is located between one pair of the low refractive index film layer and the high refractive index film layer.

[0007] According to one aspect of the present invention, the substrate is made of a white board, a blue board, colored glass or resin;

[0008] The refractive index of the material of the low-refractive-index film layer is less than 1.8;

[0009] The refractive index of the material of the high refractive index film layer is greater than 1.8;

[0010] The material of the metal film layer is alloy.

[0011] According to one aspect of the present invention, the material of the low refractive index film layer is silicon oxide, magnesium fluoride, magnesium oxide, aluminum oxide, aluminum fluoride or lanthanum fluoride;

[0012] The material of the high refractive index film layer is titanium oxide, tantalum oxide, germanium oxide, hafnium oxide, holmium oxide, lanthanum oxide, niobium oxide or zirconium oxide;

[0013] The material of the metal film layer is silver-aluminum alloy, gold-aluminum alloy, silver-chromium alloy or gold-chromium alloy.

[0014] According to one aspect of the present invention, the film group further includes an over-plating layer, and the over-plating layer is located on both sides of the metal film layer.

[0015] According to one aspect of the present invention, the material of the over-plating layer is an oxide of the metal element contained in the metal film layer.

[0016] According to one aspect of the present invention, the over-plating layer is made of aluminum oxide, silver oxide or chromium oxide.

[0017] According to one aspect of the present invention, the reflectivity of the film structure is above 98% in the wavelength range of 500nm-3000nm and the incident angle of 0°-85°.

[0018] According to the concept of the present invention, by reasonably selecting the substrate material and film material used for coating, and using a special method to make the metal film material, and then by reasonably designing the film layer structure, the reflectivity and reliability performance of the film system structure can be guaranteed.

[0019] According to one solution of the present invention, the metal film layer is formed by mixing different metals, thereby increasing the reliability of the metal film layer itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram showing the structure of an undeployed membrane group of a membrane system structure according to an embodiment of the present invention;

[0021] Figure 2 A schematic diagram showing a structure of an expanded membrane group of a membrane system structure according to an embodiment of the present invention;

[0022] Figure 3 A schematic diagram schematically showing the reflectivity of a film structure according to one embodiment of the present invention;

[0023] Figure 4 A schematic diagram schematically showing reliability test conditions of a film structure according to one embodiment of the present invention;

[0024] Figure 5 Schematic diagram showing data of a film structure before and after a reliability test according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0026] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not limited to the following embodiments.

[0028] When preparing the metal film layer of the present invention, the two metal film materials are first placed in a vacuum environment, and then the two film materials are mixed in a molten state by heating. After cooling, they are heated again, and the heating-cooling process is repeated until the film materials are fully mixed. Specifically, in this embodiment, the weight of the two metal film materials is equal, and they can be mixed in a crucible, and placed in a coating device for vacuuming, and the vacuum degree can be drawn to 8.0E-4Pa. The mixed film material is then fused with an electron gun to achieve mixing of the two metals in a molten state. After the metal cools, it is heated to melt to achieve circulation. In this way, a total of three (or more) cycles of heating-cooling process can ensure that the film materials are fully mixed.

[0029] The metal purity of the membrane material used in the present invention is above 99.9%, and the shape can be filamentous, granular or blocky. The metal material of the membrane material can be silver, aluminum, gold or chromium.

[0030] See also Figure 1 The high reliability standard film structure of the present invention includes a substrate 1 and a film group 2 plated on one side of the substrate 1.

[0031] See also Figure 2 The film assembly 2 comprises a high-refractive-index film layer 21, a low-refractive-index film layer 22, and a metal film layer 23 prepared using the aforementioned method. This results in a high-reflective film with metal. Within the film assembly 2, the low-refractive-index film layers 22 and the high-refractive-index film layers 21 are arranged alternately, with the metal film layer 23 positioned between one pair of low-refractive-index and high-refractive-index film layers 22 and 21, thereby preventing direct contact with the substrate 1 and potentially causing it to fall off.

[0032] In the present invention, the material of the substrate 1 is a white board (optical glass), a blue board (optical glass), a colored glass or various resin materials. The material of the low refractive index film layer 22 is a coating material with a refractive index less than 1.8, which can be silicon oxide, magnesium fluoride, magnesium oxide, aluminum oxide, aluminum fluoride or lanthanum fluoride and a mixture of the above materials (such as a silicon oxide aluminum oxide mixture, an aluminum oxide lanthanum oxide mixture, a magnesium oxide aluminum oxide mixture, etc.). The material of the high refractive index film layer 21 is a high refractive index material with a refractive index greater than 1.8, which can be titanium oxide, tantalum oxide, germanium oxide, hafnium oxide, holmium oxide, lanthanum oxide, niobium oxide or zirconium oxide. In this way, using the above oxides as film materials can improve the bonding between the metal film layer 23 and other film layers.

[0033] The material of the metal film layer 23 prepared by the above method is a mixed metal film material, that is, an alloy, which can be a silver-aluminum alloy, a gold-aluminum alloy, a silver-chromium alloy or a gold-chromium alloy.

[0034] According to one embodiment of the present invention, the metal film layer 23 is made of a silver-aluminum alloy. The silver-to-aluminum mass ratio is 1:1, the purity of the silver and aluminum is above 99.9%, and the metal film layer 23 is in the form of a filament. The above-mentioned materials are used to prepare the coating. The film materials, thickness, and film layer structure used are shown in Table 1 below:

[0035] Film material Film thickness / nm Silicon oxide 55.72 Alumina 50.09 Silver aluminum alloy 734.32 Alumina 84.18 titanium oxide 68.58 Silicon oxide 114.85 titanium oxide 41.61 Silicon oxide 48.86 titanium oxide 69.49 Silicon oxide 88.76 / / / /

[0036] Table 1

[0037] According to another embodiment of the present invention, the metal film layer 23 is made of a gold-aluminum alloy. The gold-to-aluminum ratio is 1:1, the purity of the gold and aluminum is above 99.9%, and the metal film layer 23 is in the form of a filament. The above-mentioned materials are used to prepare the film for coating. The film materials, thickness, and film layer structure used are shown in Table 2 below:

[0038] Film material Film thickness / nm Silicon oxide 55.72 Alumina 50.09 Gold aluminum alloy 734.32 Alumina 84.42 titanium oxide 68.67 Silicon oxide 115.03 titanium oxide 40.94 Silicon oxide 50 titanium oxide 69.09 Silicon oxide 84.89 titanium oxide 10.45 Silicon oxide 20

[0039] Table 2

[0040] In addition, film assembly 2 includes overcoating layers 24, which are located on both sides of metal film layer 23, namely, between low-refractive-index film layer 22 and metal film layer 23, and between high-refractive-index film layer 21 and metal film layer 23. Overcoating layers 24 are made of an oxide of the metal element contained in metal film layer 23, such as aluminum oxide, silver oxide, or chromium oxide. Thus, overcoating layers 24 serve as a transition layer, thereby ensuring film strength.

[0041] In summary, the film structure of the present invention ensures a reflectivity of more than 98% in the 500nm-3000nm band and under the conditions of 0°-85° incidence (such as 80°). Figure 3 In addition, Figure 5As shown, the reliability time of the membrane structure of the present invention can also meet the following requirements: Figure 4 The automotive-grade reliability test is performed for 1000 hours. Specifically, the film structure of the present invention remains intact under conditions of approximately 85°C and 85% RH for 1000 hours, with a reflectivity change of less than 0.5 and 3M adhesive remaining intact.

[0042] The above description is merely one embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A membrane structure, characterized in that: It comprises a substrate (1) and a film group (2) coated on the substrate (1), wherein the film group (2) comprises a high-refractive-index film layer (21), a low-refractive-index film layer (22), and a metal film layer (23); In the film group (2), the low refractive index film layers (22) and the high refractive index film layers (21) are arranged alternately; The metal film layer (23) is located between one pair of the low-refractive-index film layer (22) and the high-refractive-index film layer (21); The material of the metal film layer (23) is a silver-aluminum alloy or a gold-aluminum alloy, and the mass ratio of silver to aluminum is 1:1; or the mass ratio of gold to aluminum is 1:1; In the 500nm-3000nm band, under the conditions of 0°-85° incidence, the reflectivity is above 98%.

2. The film structure according to claim 1, characterized in that: The substrate (1) is made of a white board, a blue board, colored glass or resin; The refractive index of the material of the low-refractive-index film layer (22) is less than 1.8; The refractive index of the material of the high refractive index film layer (21) is greater than 1.

8.

3. The film structure according to claim 2, characterized in that: The material of the low refractive index film layer (22) is silicon oxide, magnesium fluoride, magnesium oxide, aluminum oxide, aluminum fluoride or lanthanum fluoride; The material of the high refractive index film layer (21) is titanium oxide, tantalum oxide, germanium oxide, hafnium oxide, holmium oxide, lanthanum oxide, niobium oxide or zirconium oxide.

4. The film structure according to claim 1, characterized in that: The film group (2) further includes an over-coating layer (24), and the over-coating layer (24) is located on both sides of the metal film layer (23).

5. The film structure according to claim 4, characterized in that: The material of the over-plating layer (24) is the oxide of the metal element contained in the metal film layer (23).

6. The film structure according to claim 5, characterized in that: The material of the over-plating layer (24) is aluminum oxide or silver oxide.

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