Composite film with functions of optical anti-reflection protection and electromagnetic shielding in visible light range

Abstract

The invention discloses a visible light range optical anti-reflection protection electromagnetic shielding function composite film, and belongs to the technical field of optical anti-reflection films. The composite film is formed by alternating high-refractive-index conductive film layers and low-refractive-index film layers, the low-refractive-index film layers are subjected to graphical processing, the projection area of the low-refractive-index film layers is smaller than that of the high-refractive-index conductive film layers, and the multiple high-refractive-index conductive film layers are communicated outside the low-refractive-index film layers; the high-refractive-index conductive film layer is made of ITO, the low-refractive-index film layer is made of magnesium fluoride, and the materials have high hardness, so that the composite film can be used as a protective film, and the environmental endurance capacity of an optical device is improved; the ITO has the conductive characteristic, and the multiple pieces of ITO are communicated outside the low-refractive-index film layer, so that the ITO can serve as an electrode, and the composite film can serve as an electric heating film under the condition that an additional electrode is not needed; and the low-refractive-index film layer is subjected to graphical processing, so that the composite film also has an electromagnetic shielding function.

Description

Technical Field

[0001] The invention discloses a composite film with optical anti-reflection protection and electromagnetic shielding function in the visible light range, belonging to the technical field of optical anti-reflection films. Background Art

[0002] The imaging system includes a photosensitive device, a lens assembly and an optical window, wherein the optical window is located at the outermost layer and plays a protective role for the internal lens assembly and photosensitive device.

[0003] Since the optical window is located in the outermost layer, when the external ambient temperature is low, the outer surface of the optical window is prone to ice or frost. When the humidity in the environment is high and the ambient temperature difference is large, the outer surface of the optical window is prone to fogging, which will reduce the shooting quality of the image acquisition device.

[0004] In order to solve the above problems, Huawei Technologies Co., Ltd.'s invention patent application number 2021110728068, "Optical Window, Optical Lens, and Image Capture Device," provides a decisive solution, which adds a layer of heating anti-reflection film on the optical window, including a heating film layer, m first anti-reflection film layers, and n second anti-reflection film layers, where m and n are both positive integers, and the m first anti-reflection film layers, the heating film layer, and the n second anti-reflection film layers are stacked and arranged in sequence. This structure can achieve the heating function while ensuring a high light transmittance, increase the temperature of the optical window, evaporate the ice, frost, or fog on the outer surface, keep the outer surface of the optical window dry, and allow the light in the environment to fully enter the optical lens, thereby improving the shooting quality of the image acquisition device and making the captured image clearer.

[0005] However, this heated antireflection film still has the disadvantages of complex structure and single function. Summary of the invention

[0006] In view of the shortcomings of the existing heating anti-reflection film, such as complex structure and single function, the present invention designs a composite film with optical anti-reflection protection and electromagnetic shielding function in the visible light range. While having the functions of the existing heating anti-reflection film, the structure is simpler and the functions are richer.

[0007] The object of the present invention is achieved in that: The composite film with optical anti-reflection protection and electromagnetic shielding function in the visible light range is composed of alternating high-refractive index conductive film layers and low-refractive index film layers. The low-refractive index film layers are patterned, and the projected area of ​​the low-refractive index film layers is smaller than that of the high-refractive index conductive film layers. Multiple high-refractive index conductive film layers are connected outside the low-refractive index film layers.

[0008] In the above-mentioned composite film with optical anti-reflection protection and electromagnetic shielding function in the visible light range, the high-refractive-index conductive film layer is ITO or indium oxide; and the low-refractive-index film layer is magnesium fluoride.

[0009] The beneficial effects of the composite film with optical anti-reflection protection and electromagnetic shielding function in the visible light range of the present invention are: First, the high refractive index conductive film layer is made of ITO, and the low refractive index film layer is made of magnesium fluoride. Both materials have high hardness, so that the composite film of the present invention can be used as a protective film to improve the environmental tolerance of optical devices; Second, ITO has conductive properties, and multiple ITOs are connected outside the low-refractive index film layer, so that ITO itself can be used as an electrode. Without the need for external electrodes, the composite film of the present invention can be used as an electric heating film; Third, the low refractive index film layer is processed by graphics, so that the composite film of the present invention also has electromagnetic shielding function; in addition, multiple ITOs are connected outside the low refractive index film layer, and the resistivity of this parallel structure is much lower than that of a single layer of ITO, so it can greatly improve the shielding effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic structural diagram of the composite film with optical anti-reflection protection and electromagnetic shielding function in the visible light range of the present invention.

[0011] In the figure: 1 high refractive index conductive film layer, 2 low refractive index film layer. DETAILED DESCRIPTION

[0012] The specific implementation modes of the present invention will be further described in detail below with reference to the accompanying drawings.

[0013] The composite film with optical anti-reflection protection and electromagnetic shielding function in the visible light range under this specific embodiment has a structural schematic diagram as shown in FIG. Figure 1 As shown, it is composed of alternating high-refractive index conductive film layers 1 and low-refractive index film layers 2. The low-refractive index film layers 2 are subjected to a graphical treatment, so that the composite film of the present invention also has an electromagnetic shielding function, and the projected area of ​​the low-refractive index film layers 2 is smaller than the high-refractive index conductive film layers 1. A plurality of the high-refractive index conductive film layers 1 are connected outside the low-refractive index conductive film layers 2, so that ITO itself can be used as an electrode. Without the need for an external electrode, the composite film of the present invention can be used as an electric heating film; the high-refractive index conductive film layer 1 is ITO or indium oxide; the low-refractive index film layer 2 is magnesium fluoride. Both materials have a relatively high hardness, so that the composite film of the present invention can be used as a protective film to improve the environmental tolerance of optical devices.

Claims

1. A composite film with optical anti-reflection protection and electromagnetic shielding function in the visible light range, characterized in that: The invention is composed of alternating high refractive index conductive film layers (1) and low refractive index film layers (2), wherein the low refractive index film layers (2) are patterned, and the projected area of ​​the low refractive index film layers (2) is smaller than that of the high refractive index conductive film layers (1), and a plurality of the high refractive index conductive film layers (1) are connected outside the low refractive index film layers (2).

2. The composite film with optical anti-reflection protection and electromagnetic shielding function in the visible light range according to claim 1, characterized in that: The high refractive index conductive film layer (1) is ITO or indium oxide; the low refractive index film layer (2) is magnesium fluoride.

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