Composite film structure with optical anti-reflection protection and electromagnetic shielding functions

Abstract

The utility model discloses a composite film structure with optical anti-reflection protection and electromagnetic shielding functions, 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 optical antireflection protection electromagnetic shielding composite film structure of this invention belongs to the field of optical antireflection film technology. Background Technology

[0002] The imaging system includes a photosensitive device, a lens assembly, and an optical window. The optical window is located on the outermost layer and protects the internal lens assembly and photosensitive device.

[0003] Because the optical window is located on the outermost layer, its outer surface is prone to freezing or frost when the ambient temperature is low, and fogging when the humidity is high and the temperature difference is large. Both of these factors reduce the image quality of the image acquisition device.

[0004] To address the aforementioned issues, Huawei Technologies Co., Ltd.'s invention patent application No. 2021110728068, "Optical Window, Optical Lens, and Image Acquisition Device," provides a solution. It adds a heating anti-reflection film to the optical window, comprising a heating film layer, m first anti-reflection film layers, and n second anti-reflection film layers, where m and n are positive integers. The m first anti-reflection film layers, the heating film layer, and the n second anti-reflection film layers are sequentially stacked. This structure can achieve a heating function while maintaining high light transmittance, increasing the temperature of the optical window, evaporating ice, frost, or fog on the outer surface, keeping the outer surface of the optical window dry, allowing sufficient ambient light to enter the optical lens, thereby improving the image acquisition quality of the image acquisition device and resulting in clearer images.

[0005] However, this type of heated antireflective membrane also suffers from drawbacks such as complex structure and limited functionality. Summary of the Invention

[0006] To address the shortcomings of existing heating antireflection films, which are complex in structure and limited in function, this invention designs a composite film structure with optical antireflection protection and electromagnetic shielding functions. While retaining the functions of existing heating antireflection films, the structure is simpler and the functions are more abundant.

[0007] The objective of this invention is achieved as follows:

[0008] The optical anti-reflection protection electromagnetic shielding composite film structure is composed of alternating first conductive film layer and second film layer. The second film layer is patterned and its projected area is smaller than that of the first conductive film layer. Multiple first conductive film layers are connected outside the second film layer. The refractive index of the first conductive film layer is higher than that of the second film layer.

[0009] In the aforementioned composite film structure for optical anti-reflection protection and electromagnetic shielding, the first conductive film layer is ITO or indium oxide; and the second film layer is magnesium fluoride.

[0010] The beneficial effects of the optical anti-reflection and electromagnetic shielding composite film structure of this invention are as follows:

[0011] 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, which enables the composite film of the present invention to serve as a protective film and improve the environmental tolerance of optical devices.

[0012] Secondly, ITO has conductive properties, and multiple ITOs are connected outside the low refractive index film layer, so that ITO itself can act as an electrode. Without the need for an external electrode, the composite film of the present invention can act as an electric heating film.

[0013] Third, the low-refractive-index film layer is patterned, which enables the composite film of the present invention to also have 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 ITO, thus greatly improving the shielding effectiveness. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the composite film structure for optical anti-reflection protection and electromagnetic shielding functions of the present invention.

[0015] In the figure: 1. High refractive index conductive film layer, 2. Low refractive index film layer. Detailed Implementation

[0016] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings.

[0017] The optical anti-reflection protection electromagnetic shielding composite film structure of this specific embodiment is shown in the schematic diagram below. Figure 1 As shown, the composite film is composed of alternating high-refractive-index conductive film layer 1 and low-refractive-index film layer 2. The low-refractive-index film layer 2 is patterned, giving the composite film electromagnetic shielding capabilities. The projected area of ​​the low-refractive-index film layer 2 is smaller than that of the high-refractive-index conductive film layer 1. Multiple high-refractive-index conductive film layers 1 are interconnected outside the low-refractive-index film layer 2, allowing ITO itself to function as an electrode. Without the need for external electrodes, the composite film can function as an electrically heated 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 high hardness, enabling the composite film to function as a protective film and improve the environmental tolerance of optical devices.

Claims

1. A composite film structure with optical anti-reflection protection and electromagnetic shielding functions, characterized in that, It is composed of alternating first conductive film layer (1) and second film layer (2). The second film layer (2) is patterned and its projected area is smaller than that of the first conductive film layer (1). Multiple first conductive film layers (1) are connected outside the second film layer (2). The refractive index of the first conductive film layer (1) is higher than that of the second film layer (2).

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