Special-shaped angle polarizing film optical filter and system

Abstract

The invention discloses a special-shaped angle polarizing film optical filter which comprises a first number of first material film layers and a second number of second material film layers, the refractive index of the first material film layers is larger than that of the second material film layers, and the first material film layers and the second material film layers alternately form a multi-layer film structure. The film thickness of each first material film layer and each second material film layer is determined based on the polarization angle. By accurately controlling the thickness and the refractive index of the film layer, the polarizing film system with the specific polarization angle can be obtained according to the film layers with different refractive indexes and different film layer thickness adjustment, and the problems that in the prior art, a common polarizing film system is limited in angle and insufficient in flexibility are solved.

Description

Technical Field

[0001] The present application relates to the field of optoelectronic technology, and in particular to a special-shaped angle polarization film filter and a system. Background Art

[0002] In current technology, optical polarizing film is a key optical component, widely used in modern optical systems and optical instruments. Polarizing film can selectively absorb or transmit light waves in a specific direction, thereby achieving polarization control of light waves. Common polarizing films include prism-type polarizing films and flat-type polarizing films, which play an important role in different application scenarios.

[0003] However, most common polarizing films at present are at 45-degree angles, and there are no polarizing films for lenses with multiple angles. This means that when light is incident at a non-45-degree angle, the polarizing film may not provide the ideal polarization effect. This limits the use of polarizing films in some special application scenarios, such as anisotropic camera lenses or military corner observation mirrors. Summary of the invention

[0004] Based on the above problems, the present application provides a special-angle polarizing film filter and system.

[0005] The embodiments of the present application disclose the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a special-angle polarizing film filter, comprising: a first number of first material film layers and a second number of second material film layers, the refractive index of the first material film layer is greater than the refractive index of the second material film layer, the first material film layer and the second material film layer alternately form a multilayer film structure; the film thickness of each first material film layer and each second material film layer is determined based on the polarization angle.

[0007] In a possible implementation, the first material film layer is TiO2, and the second material film layer is SiO2.

[0008] In a possible implementation manner, the second material film layer is stacked on the first material film layer.

[0009] In a possible implementation manner, the film thickness ratio of the first material film layer to the second material film layer is determined according to a high transmittance of P-polarized light and a low transmittance of S-polarized light.

[0010] In a possible implementation, the film thickness of each first material film layer and each second material film layer is determined by optical simulation software based on the polarization angle and the wavelength range.

[0011] In a possible implementation manner, it also includes: a substrate, and the multilayer film structure composed of the first material film layer and the second material film layer is deposited on the substrate.

[0012] In a possible implementation manner, it further includes: a protective layer, wherein the protective layer covers the outermost first material film layer or the second material film layer.

[0013] In a possible implementation, the total thickness of the multi-layer film structure is the sum of the thicknesses of the plurality of first material film layers and the second material film layers, and the total thickness does not exceed a target threshold.

[0014] In a possible implementation, it further includes: at least one anti-reflection coating, where the anti-reflection coating covers the outermost first material film layer or the second material film layer to reduce the influence of ambient light on polarization performance.

[0015] In a second aspect, an embodiment of the present application provides an optical system, comprising the profiled angle polarizing film filter described in the first aspect, and at least one optical element used in conjunction with the polarizing film filter.

[0016] Compared with the prior art, this application has the following beneficial effects:

[0017] A special-angle polarizing film filter is proposed. The filter includes a first number of first material film layers and a second number of second material film layers, wherein the refractive index of the first material film layer is greater than the refractive index of the second material film layer. These film layers alternate to form a multilayer film structure to achieve a specific polarization effect. Moreover, the film thickness of each first material film layer and each second material film layer is determined based on the polarization angle. By precisely controlling the thickness and refractive index of the film layer, the present application can adjust a polarizing film system with a specific polarization angle according to film layers with different refractive indices and different film layer thicknesses, thereby overcoming the angle limitation and lack of flexibility of ordinary polarizing film systems in the prior art. For example, the present application designs a polarizing film system with an angle of 56.5 through a film system, so that the light can achieve a transmittance of more than 99% for P polarized light in the range of 525 to 565 nm and a transmittance of less than 1% for S polarized light at an angle of 56.5 degrees. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1A schematic diagram of a special-angle polarizing film filter provided in an embodiment of the present application;

[0020] Figure 2 Schematic diagram of the transmittance variation of P-polarized light and S-polarized light in an embodiment of the present application;

[0021] Figure 3 A flow chart of a method for manufacturing a special-angle polarizing film filter provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] To facilitate understanding of the technical solutions provided by the embodiments of the present application, the professional terms involved in the embodiments of the present application will be explained below.

[0024] Optical polarizing film refers to a type of optical film used to generate polarized light or suppress the polarization effect of thin films, also known as thin film polarizers. This film material is designed to make the light in one polarization direction (usually the p component) of the incident light highly transparent, while the light in the other polarization direction (s component) is highly reflected, thereby achieving polarization splitting.

[0025] The principle of polarizing film is based on the polarization phenomenon of electromagnetic waves. When light passes through a crystal or through reflection, refraction, scattering and other processes, polarization occurs, that is, the electric field component of the light wave vibrates only in a specific plane. The polarizing film can selectively absorb light waves in one direction, thereby achieving polarization control of the light waves. Specifically, the polarizing film can selectively absorb light waves perpendicular to its direction, but not absorb light waves parallel to its direction. The polarization efficiency of the polarizing film refers to the proportion of light waves absorbed or transmitted in the selected polarization direction. Generally speaking, the higher the polarization efficiency, the stronger its ability to control light waves. Different materials will also have different degrees of absorption or transmission of light waves of different wavelengths.

[0026] Prism-type polarizing films are generally located between two symmetrical right-angle prisms, so that the light beam is incident at the Brewster angle on the interface of the film layer. At the Brewster angle, light parallel to the incident plane (p component) is highly transmitted, while light perpendicular to the incident plane (s component) is highly reflected, thereby achieving polarization splitting. By using different film systems and different geometric structures, prismatic polarizing films can produce partially polarized light, elliptically polarized light, circularly polarized light, and linearly polarized light.

[0027] To facilitate understanding of the technical solutions provided by the embodiments of the present application, the background technology involved in the embodiments of the present application will be described below.

[0028] As mentioned above, in existing optical technology, polarizing film is a key optical component used to generate polarized light or suppress the polarization effect of thin films. Traditional polarizing films, such as prism-type polarizing films and flat-type polarizing films, have been widely used in various optical systems and instruments.

[0029] However, the current polarization film technology is mostly limited to 45-degree polarization film lenses. Ordinary polarization films are mainly used to produce linear polarized light. They have high polarization efficiency, but their functions are relatively simple and difficult to meet the needs of multiple angles and wavelength ranges. Due to the limitation of fixed angles, ordinary polarization films may not achieve optimal effects in certain specific application scenarios. For example, in military reconnaissance and observation, high-precision polarization control is required to improve observation effects, especially for target identification in complex environments. The 45-degree polarization film cannot provide multi-angle polarization control, which limits the observation effect and affects the accuracy and reliability of target identification.

[0030] Under different environmental conditions (such as temperature and humidity changes), the performance of the 45-degree polarization film system may be affected, especially in extreme environments, where its stability and reliability are difficult to guarantee. For applications that require polarized light in a specific wavelength range, the 45-degree polarization film system cannot be accurately optimized for wavelength, limiting its application in high-precision optical systems.

[0031] The design of the 45-degree polarizing film system is relatively fixed and difficult to flexibly adjust according to specific needs, which increases the difficulty of design and manufacturing. In order to meet the needs of different angles, it may be necessary to design and manufacture a variety of polarizing film systems with different angles, which increases the cost of R&D and production.

[0032] In order to solve the above problems, the embodiment of the present application realizes a polarizing film system with an angle of 56.5 degrees through a film system design. Specifically, the present application enables the light to achieve a transmittance of more than 99% for P-polarized light in the wavelength range of 525 to 565nm, while the transmittance of S-polarized light is less than 1% at an angle of 56.5 degrees. This design not only overcomes the problem of a single polarization angle in the prior art, but also improves the polarization efficiency and expands the application scope of the polarizing film. In addition, the design of the present application can adjust the polarization angle according to actual needs to realize a polarizing film system with any angle from 0 to 90 degrees, further meeting the diversified needs in different application scenarios. At the same time, the wavelength range of the polarizing film system can also be adjusted as needed to meet the needs of polarized light of a specific wavelength.

[0033] It should be noted that the profiled angle polarizing film filter provided by the present application can be applied to the field of optoelectronic technology. The above is only an example and does not limit the application field of the profiled angle polarizing film filter and system provided by the present application. In addition, the embodiments of the present application may not limit the execution subject of the method for manufacturing the profiled angle polarizing film filter. For example, the method for manufacturing the profiled angle polarizing film filter in the embodiment of the present application can be applied to data processing equipment such as terminal devices or servers. Among them, the terminal device can be an electronic device such as a computer, a personal digital assistant (PDA), etc. The server can be an independent server, a cloud server, or a cluster server composed of multiple servers.

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] The following is an example of an embodiment to illustrate a special-angle polarizing film filter provided by the present application. Figure 1 , Figure 1 A schematic diagram of a special-shaped angle polarizing film filter provided in an embodiment of the present application, comprising: a first number of first material film layers, the first material film layers can be Figure 1 The second layer in the second number of second material film layers, the second material film layer can be Figure 1 The first layer in the structure, the refractive index of the first material film layer is greater than the refractive index of the second material film layer, the first material film layer and the second material film layer alternately form a multilayer film structure; the film thickness of each first material film layer and each second material film layer is determined based on the polarization angle.

[0036] Among them, the filter is formed by alternating layers of two different materials. This structural design utilizes the interference principle in thin film optics. By controlling the thickness and refractive index of each layer of the film, the transmission and reflection characteristics of light can be precisely controlled.

[0037] The refractive index of the first material film layer is greater than that of the second material film layer. This design helps to produce a phase difference between different film layers, thereby affecting the interference effect of light waves and achieving selective transmission of specific polarized light. The first material film layer usually selects a material with a high refractive index, which can provide a strong light wave interference effect. The second material film layer usually selects a material with a low refractive index. This material has a low refractive index and helps to adjust the phase delay of light waves.

[0038] The thickness of each first material film layer and second material film layer is determined based on the polarization angle, that is, the thickness of the film layer is precisely designed to meet the performance requirements at a specific polarization angle. This design takes into account the propagation path and phase change of light waves in different film layers to achieve different processing of P-polarized light and S-polarized light.

[0039] Therefore, by changing the thickness of the film layer and the refractive index of the material, the optical properties of the film system, including the polarization angle, can be adjusted. The thickness and refractive index of the film layer determine the phase delay of light when passing through the film system, thereby affecting the polarization state. By designing the stacking order of the multilayer film and the thickness of each layer, a film system with specific polarization characteristics can be created. Each layer of the film will produce a certain phase delay for the light passing through. Through precise calculation and design, different transmittances for P-polarized light and S-polarized light at specific angles can be achieved.

[0040] For example, in military reconnaissance and observation, high-precision polarization control is required to improve the observation effect, especially in target identification in complex environments. By adjusting the film thickness and number of the first material film layer and the second material film layer, a polarization film system with any angle of 0 to 90 degrees can be achieved, providing more precise polarization control and enhancing the observation effect.

[0041] In one possible implementation, the embodiment of the present application may include 43 film layers, alternating between silicon dioxide (SiO2) and titanium dioxide (TiO2), and the thickness of each film layer may be accurate to two decimal places.

[0042] Silicon dioxide (SiO2) has a low refractive index (about 1.46) and is often used as a low refractive index layer in optical film systems. SiO2 has high transparency in the visible and near-infrared regions and absorbs almost no light energy. SiO2 has good chemical stability and corrosion resistance and is not easily affected by environmental factors. SiO2 can be easily deposited into thin films by a variety of methods (such as evaporation, sputtering, etc.), and the process is mature.

[0043] Titanium dioxide (TiO2) has a high refractive index (about 2.4) and is often used as a high refractive index layer in optical film systems. TiO2 has good optical properties in the visible and near-infrared regions and can effectively reflect and transmit light of specific wavelengths. TiO2 also has good chemical stability and corrosion resistance. TiO2 can also be easily deposited into thin films by a variety of methods (such as evaporation, sputtering, etc.), and the process is mature.

[0044] By alternating high-refractive-index TiO2 and low-refractive-index SiO2, a multilayer film structure can be formed. This structure can effectively control the phase and amplitude of light and achieve efficient polarization control. Under specific film thickness and angle, light will experience the Brewster angle effect at the interface of different refractive indices, that is, p-polarized light is highly transmitted and s-polarized light is highly reflected. By precisely designing the film system, efficient polarization splitting at a specific angle can be achieved.

[0045] Both SiO2 and TiO2 have good chemical stability and corrosion resistance, which enables the film system to maintain stable performance under various environmental conditions. The alternating multi-layer film structure can improve the overall mechanical strength of the film system and reduce damage caused by external factors (such as temperature changes, mechanical stress, etc.).

[0046] By adjusting the film thickness and number of layers of SiO2 and TiO2, a polarization film system with any angle of 0 to 90 degrees can be achieved to meet the needs of different application scenarios. By optimizing the film system design, polarization control of a specific wavelength range can be achieved, which is suitable for a variety of optical devices and systems.

[0047] The high transparency and low absorption characteristics of SiO2 and TiO2 make the film system have extremely low loss in the visible light and near-infrared regions, ensuring efficient light transmission. By precisely controlling the film thickness and number of layers, high transmittance and low reflectivity within a specific wavelength range can be achieved, improving the overall performance of the optical system.

[0048] Therefore, the embodiment of the present application not only achieves high-efficiency polarization control by alternately using silicon dioxide (SiO2) and titanium dioxide (TiO2), but also improves the stability and durability of the film system, expands the scope of application, and optimizes the optical performance. This design method enables the polarizing film to exhibit excellent performance in a variety of application scenarios and improves the performance of the optical system.

[0049] By precisely controlling the thickness and refractive index of the film layer, the embodiment of the present application can design a polarization film system with a specific polarization angle. For example, the embodiment of the present application designs a polarization film system with an angle of 56.5 through the film system, so that the light can achieve a transmittance of more than 99% for P polarized light in the range of 525 to 565nm and a transmittance of less than 1% for S polarized light at an angle of 56.5 degrees. Specifically, it includes 43 film layers, alternating between silicon dioxide (SiO2) and titanium dioxide (TiO2). The thickness of each film layer is accurately calculated and optimized to achieve efficient polarization control within a specific angle and wavelength range, that is, high transmittance of P polarized light and low transmittance of S polarized light. The following is a deployment relationship between the various film layers provided in the embodiment of the present application and the corresponding film thickness, see Table 1, Table 1 is a table of the relationship between film layers and film thickness.

[0050] Table 1. Relationship between film layer and film thickness

[0051]

[0052]

[0053]

[0054] By precisely designing the film system, the present application achieves efficient polarization control at an angle of 56.5 degrees, with the transmittance of P-polarized light greater than 99% and the transmittance of S-polarized light less than 1%. This design not only improves the performance of the optical system, but also expands the scope of application, making it suitable for optical applications at various angles. By alternating between high-refractive index and low-refractive index materials and precisely controlling the film thickness, the film system design of the present application has the advantages of high efficiency, multi-angle adaptability, low loss, and high damage value. The following describes the changes in the transmittance of P-polarized light and S-polarized light at different wavelengths when the incident angle is 56.5 degrees, see Figure 2 Schematic diagram of the transmittance change of P-polarized light and S-polarized light in the embodiment of the present application.

[0055] The light source type is WHITE, the incident medium is AIR, the substrate is GLASS, the output medium is GLASS, the detector is IDEAL, the horizontal axis is the wavelength (unit: nm), from 500nm to 600nm, and the vertical axis is the transmittance (%).

[0056] The transmittance of P-polarized light begins to increase rapidly at around 520nm. Between 525nm and 565nm, the transmittance of P-polarized light is close to 100%. As the wavelength increases further, the transmittance of P-polarized light decreases slightly, but remains at a high level throughout the measurement range.

[0057] The transmittance of S-polarized light begins to decrease rapidly at around 560nm. Between 525nm and 565nm, the transmittance of S-polarized light is almost zero. As the wavelength increases further, the transmittance of S-polarized light gradually increases, but it is still relatively low overall.

[0058] In the wavelength range of 525nm to 565nm, the transmittance of P-polarized light is close to 100%, while the transmittance of S-polarized light is close to 0%. This shows that the polarizing film filter can effectively separate P-polarized light and S-polarized light within the specified wavelength range. At an incident angle of 56.5 degrees, the polarizing film filter exhibits excellent polarization selectivity, effectively filtering out unwanted S-polarized light while allowing the desired P-polarized light to pass.

[0059] Therefore, at an incident angle of 56.5 degrees, the polarizing film filter has extremely high transmittance for P-polarized light in the wavelength range of 525nm to 565nm, and extremely low transmittance for S-polarized light in the same wavelength range, showing efficient polarization control capabilities. In practical application scenarios, it can help researchers accurately control the polarization state of light for more accurate experiments and data analysis. It can be used in optical systems that require specific angles and wavelength ranges, such as laser systems, imaging systems, etc., to improve the performance and efficiency of the system.

[0060] In a possible implementation, the special-angle polarizing film filter further includes: a substrate, and a multilayer film structure composed of the first material film layer and the second material film layer is deposited on the substrate.

[0061] The substrate is the foundation of the multilayer film structure, providing support and stability. Substrate materials include glass, quartz, plastic, etc. When selecting a substrate material, its transparency, mechanical strength and thermal stability should be considered. Multilayer film structures are usually deposited on the substrate by methods such as physical vapor deposition (PVD) or chemical vapor deposition (CVD).

[0062] In a possible implementation, the profiled angle polarizing film filter further includes: a protective layer, wherein the protective layer covers the outermost first material film layer or the second material film layer.

[0063] Protect the multi-layer film structure from damage by the external environment (such as moisture, dust, scratches, etc.) and extend the service life of the filter. The protective layer material includes hard oxide (such as Al2O3) or other corrosion-resistant and wear-resistant materials. The protective layer is usually deposited on the outermost film layer by PVD or CVD method.

[0064] In a possible implementation, the total thickness of the multi-layer film structure is the sum of the thicknesses of the plurality of first material film layers and the second material film layers, and the total thickness does not exceed a target threshold.

[0065] The total thickness of a multilayer film structure refers to the sum of the thicknesses of all first material film layers and second material film layers. The target threshold for the total thickness is set to ensure the mechanical strength and optical performance of the filter. Too thick a film layer may cause stress concentration, affecting the stability and reliability of the filter. During design, it is necessary to balance the film layer thickness and the total thickness through an optimization algorithm to ensure that the total thickness does not exceed the target threshold while meeting the polarization performance.

[0066] In a possible implementation, the profiled angle polarizing film filter further includes: at least one anti-reflection coating, which covers the outermost first material film layer or the second material film layer to reduce the influence of ambient light on polarization performance.

[0067] Anti-reflection coating is used to reduce the reflection of ambient light on the filter surface, improve transmittance, reduce the interference of stray light, and improve polarization performance. Common anti-reflection coating materials include low refractive index materials such as MgF2 and SiO2. Anti-reflection coating is usually deposited on the outermost film layer by PVD or CVD method. The thickness and refractive index of the anti-reflection coating need to be optimized according to the specific application to ensure the best anti-reflection effect.

[0068] Therefore, the other features of the above-mentioned several special-angle polarizing film filters ensure that the filters have efficient polarization control performance within a specific polarization angle and wavelength range, and have good mechanical stability and environmental adaptability.

[0069] In a possible implementation, the film thickness of each first material film layer and each second material film layer is determined by optical simulation software based on the polarization angle and the wavelength range.

[0070] The following is a description of the method for manufacturing a special-shaped angle polarizing film filter provided in the embodiment of the present application. Figure 3 ,Should Figure 3 A flowchart of a method for manufacturing a special-angle polarizing film filter provided in an embodiment of the present application, the method comprising:

[0071] S101. Determine the required polarization angle and wavelength range.

[0072] Determine the design goals of the polarizing filter, including the polarization angle and wavelength range. Determine the polarization angle, such as 56.5 degrees. Determine the wavelength range, such as 525 to 565 nm.

[0073] S102, calculating the film thickness of the first material film layer and the second material film layer according to the determined polarization angle and wavelength range.

[0074] The thickness of the first material film layer (high refractive index material, such as TiO2) and the second material film layer (low refractive index material, such as SiO2) are determined through theoretical calculation.

[0075] Use optical thin film design software (such as TFCalc, OptiLayer, etc.) to input the polarization angle and wavelength range. Select appropriate materials (such as TiO2 and SiO2) and their refractive index. Run optimization algorithms (such as genetic algorithms, simulated annealing algorithms, etc.) to calculate the optimal film thickness of each film layer.

[0076] S103 , alternately depositing a first material film layer and a second material film layer with a calculated thickness on the substrate.

[0077] According to the calculation results, a multilayer film structure is prepared on the substrate. Prepare the substrate material, such as a glass substrate. Use physical vapor deposition (PVD) or chemical vapor deposition (CVD) to sequentially deposit the first material film layer and the second material film layer. Ensure that the thickness of each film layer meets the calculation results.

[0078] S104. Verify the polarization performance of the multilayer film structure through optical simulation software.

[0079] Verify whether the prepared multilayer film structure achieves the expected polarization performance.

[0080] Place the prepared sample into the optical simulation software for simulation. Calculate and record the transmittance and reflectance of P-polarized light and S-polarized light. Compare the simulation results with the design goals to determine whether they meet the preset standards.

[0081] S105. When the polarization performance obtained by simulation does not meet the preset standard, adjust the film thickness and repeat S103 until the polarization performance reaches the preset standard.

[0082] By repeatedly adjusting the film thickness, it is ensured that the final polarizing film filter meets the design goals.

[0083] If the simulation results show that the transmittance of P polarized light is less than 99% or the transmittance of S polarized light is more than 1%, the film thickness needs to be adjusted. Recalculate the film thickness, return to step S103, and prepare the sample again. Repeat step S104 and verify the polarization performance again until the preset standard is met.

[0084] Thus, the embodiment of the present application ensures that the prepared special-angle polarizing film filter has efficient polarization control performance within a specific polarization angle and wavelength range. This method combines theoretical calculation, experimental preparation and performance verification to ensure that the performance of the final filter meets the design goal.

[0085] In a possible implementation manner, the film thickness ratio of the first material film layer to the second material film layer is determined according to a high transmittance of P-polarized light and a low transmittance of S-polarized light.

[0086] Use optical thin film design software (such as TFCalc, OptiLayer, etc.) to establish an optical model of the multilayer film structure. Use optimization algorithms (such as genetic algorithms, simulated annealing algorithms, etc.) to calculate the optimal film thickness ratio of the first material film layer and the second material film layer to achieve the design goal.

[0087] Assume an initial set of film thickness ratios, such as 1:1. Through multiple iterations, adjust the film thickness ratio until a high transmittance for P polarized light and a low transmittance for S polarized light are achieved. After each iteration, evaluate the transmittance for P polarized light and S polarized light to ensure that the design goals are met.

[0088] According to the optimized film thickness ratio, samples are prepared by physical vapor deposition (PVD) or chemical vapor deposition (CVD) and other methods. The transmittance and reflectivity of the samples are tested using equipment such as a spectrophotometer to verify the accuracy of the design.

[0089] The embodiments of the present application also provide corresponding devices and computer storage media for implementing the test method solutions provided in the embodiments of the present application.

[0090] The device includes a memory and a processor, the memory is used to store instructions or codes, and the processor is used to execute the instructions or codes so that the device executes the test method described in any embodiment of the present application.

[0091] The computer storage medium stores codes, and when the codes are executed, a device executing the codes implements the test method described in any embodiment of the present application.

[0092] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. For the system or device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0093] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0094] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application 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 operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0095] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0096] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0097] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0098] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A special-angle polarizing film filter, characterized in that: include: There are a first number of first material film layers and a second number of second material film layers, the refractive index of the first material film layer is greater than the refractive index of the second material film layer, and the first material film layer and the second material film layer alternately form a multilayer film structure; the film thickness of each first material film layer and each second material film layer is determined based on the polarization angle.

2. The special-angle polarizing film filter according to claim 1, characterized in that: The first material film layer is TiO2, and the second material film layer is SiO2.

3. The special-angle polarizing film filter according to claim 2, characterized in that: The second material film layer is stacked on the first material film layer.

4. The special-angle polarizing film filter according to claim 1, characterized in that: The film thickness ratio of the first material film layer to the second material film layer is determined according to the high transmittance of P-polarized light and the low transmittance of S-polarized light.

5. The special-angle polarizing film filter according to claim 1, characterized in that: The film thickness of each first material film layer and each second material film layer is determined by optical simulation software based on the polarization angle and wavelength range.

6. The special-angle polarizing film filter according to claim 1, characterized in that: Also includes: A substrate, on which a multilayer film structure composed of the first material film layer and the second material film layer is deposited.

7. The special-angle polarizing film filter according to claim 1, characterized in that: Also includes: The protective layer covers the outermost first material film layer or the second material film layer.

8. The special-angle polarizing film filter according to claim 1, characterized in that: The total thickness of the multi-layer film structure is the sum of the thicknesses of the plurality of first material film layers and the second material film layers, and the total thickness does not exceed the target threshold.

9. The special-angle polarizing film filter according to claim 1, characterized in that: Also includes: At least one anti-reflection coating, the anti-reflection coating covers the outermost first material film layer or the second material film layer, and is used to reduce the influence of ambient light on polarization performance.

10. An optical system, characterized in that: The invention comprises the special-angle polarizing film filter according to any one of claims 1 to 9, and at least one optical element used in conjunction with the polarizing film filter.

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