TWI735258B - Coating element for drone lens - Google Patents

Abstract

Disclosed is a coating element for a drone lens, comprising: a substrate; and a laminated coating structure, which is coated on an upper surface of the substrate, wherein the coating element is provided with a light reflectance greater than 4% for a reflection angle of 0 degrees and with a light reflectance greater than 6% for a reflection angle of 50 degrees to reflect visible light and infrared light.

Description

Coating element installed on drone lens

The present invention relates to a photographing system carried by an unmanned aerial vehicle, and particularly relates to a coating element installed on the lens of an unmanned aerial vehicle.

UAV is an unmanned aerial vehicle that uses remote control or autopilot technology to perform environmental observation and reconnaissance tasks. Compared with traditional aircraft, UAV has the advantages of low equipment cost and large flexible application space. In order to perform tasks such as environmental observation and reconnaissance, UAVs are usually equipped with a photography system to take pictures of the observed and reconnaissance environment.

In recent years, the use of drones has become more and more popular. In order to avoid damage to the lens of the photographic system carried by the drone due to external damage, it is necessary to develop a protective device that can protect the lens of the photographic system without affecting the clarity of the photographic system.

Therefore, the object of the present invention is to provide a coating element installed on the drone lens, which can not only protect the lens of the camera system carried by the drone, nor affect the sharpness of the camera system.

The technical means adopted by the present invention to solve the problems of the conventional technology is to provide a coating element mounted on the drone lens, and the coating element includes: a substrate, The light sensing wavelength band of the substrate is between 400nm and 950nm; and a coating laminate structure is plated on the upper surface of the substrate, the coating laminate structure is a plurality of coating layers, and the plurality of coating layers includes A plurality of titanium pentoxide coating layers and a plurality of silicon dioxide coating layers, the coating layers of the plurality of layers are formed by alternately stacking the titanium pentoxide coating layer and the silicon dioxide coating layer, each layer The coating thickness of the titanium pentoxide coating layer and each layer of the silicon dioxide coating layer is a multiple of a quarter of the wavelength of light, and the coating thickness of each layer of the titanium pentoxide coating layer is greater than that of each layer The coating thickness of the silicon dioxide coating layer, where the light reflectivity of the coating element is higher than 4% when the reflection angle is 0 degrees, and higher than 6% when the reflection angle is 50 degrees, to reflect visible light and infrared Light.

In one embodiment of the present invention, there is provided a coating element mounted on an unmanned aerial vehicle lens, wherein the refractive index of the substrate for the light sensing wavelength bands at 400 nm, 550 nm and 700 nm is less than 1.55.

In an embodiment of the present invention, a coating element mounted on a drone lens is provided, wherein the refractive index of each layer of the titanium pentoxide coating layer is in the range of 2.4 to 2.6.

In one embodiment of the present invention, there is provided a coating element mounted on a drone lens, wherein the refractive index of each layer of the silicon dioxide coating layer is in the range of 1.4 to 1.5.

In one embodiment of the present invention, there is provided a coating element mounted on a drone lens, wherein the coating thickness of the titanium pentoxide coating layer of each layer and the silicon dioxide coating layer of each layer is in the range of 0.5 qw to Between 1.5qw.

In one embodiment of the present invention, there is provided a coating element mounted on a drone lens, wherein the coating element simulates the coating thickness of the titanium pentoxide coating layer of each layer of the coating laminate structure in a software simulation mode And each layer of the silicon dioxide plating The coating thickness of the film layer is a simulation result of the coated element whose light reflectivity is higher than 4% when the reflection angle is 0 degrees and higher than 6% when the reflection angle is 50 degrees, and the coating element is based on the Simulation result production.

The coating element installed on the drone lens of the present invention has the following effects: it can protect the lens of the drone's camera system, avoid damage due to external damage, and will not affect the clarity of the drone's camera system. . With the substrate and the coating laminated structure plated on the upper surface of the substrate, the present invention has a lower reflectivity and can effectively penetrate visible light and infrared light. Therefore, the present invention is installed on the lens of the photographing system carried by the drone, and it has good definition and visual effects for both day and night shooting.

100: Coated components

100A: Coated components

1: substrate

2: Coating layer

21: Tri-titanium pentoxide coating

22: Silicon dioxide coating layer

D: drone

F: merit function

I ₀ (λ): ideal target value

I(λ): Design value

W _λ : weight on wavelength λ

Figure 1 is a schematic diagram showing a coating element installed on a drone lens according to an embodiment of the present invention; Figure 2 is a schematic diagram showing a structure of a coating element installed on a drone lens according to an embodiment of the present invention; Figure 3 is a schematic diagram showing the reflectivity of the coating element installed on the drone lens in the visible and infrared regions according to an embodiment of the present invention; Figure 4 is a schematic diagram showing the reflectivity of the coating element installed on the drone lens according to an embodiment of the present invention; A schematic diagram of the transmittance of the coating element of the lens in the visible and infrared regions; and Figure 5 is a diagram showing the transmittance of the coating element installed in the drone lens in the visible and infrared regions according to an embodiment of the present invention Another schematic diagram.

Hereinafter, the embodiments of the present invention will be described based on Figs. 1 to 5. This description is not intended to limit the implementation of the present invention, but is a kind of embodiment of the present invention.

Please refer to Figures 1 to 5, according to an embodiment of the present invention, a coating element 100 mounted on a drone D lens, the coating element 100 includes: a substrate 1, the light sensing wavelength band of the substrate 1 is in Between 400nm and 950nm; and a layered structure of coating film, which is plated on the upper surface of the substrate 1, the layered structure of the coating film is a plurality of layers of the coating layer 2, the plurality of layers of the coating layer 2 includes a plurality of layers of pentoxide Trititanium pentoxide coating layer 21 and a plurality of silicon dioxide coating layers 22. The plurality of coating layers 2 are formed by alternately stacking the trititanium pentoxide coating layer 21 and the silicon dioxide coating layer 22, each layer The coating thickness of the titanium pentoxide coating layer 21 and the silicon dioxide coating layer 22 of each layer is a multiple of a quarter of the wavelength of light, and the coating thickness of each layer of the titanium pentoxide coating layer 21 is greater than each The coating thickness of the silicon dioxide coating layer 22 of the layer, wherein the light reflectivity of the coating element 100 is higher than 4% when the reflection angle is 0 degrees, and is higher than 6% when the reflection angle is 50 degrees, To reflect visible light and infrared light.

As shown in FIG. 2, according to the embodiment of the present invention, for the coating element 100 mounted on the drone D lens, the substrate 1 is made of a material that has high light transmittance and is not easily damaged. In this embodiment, the material of the substrate 1 is polymethyl methacrylate (PMMA for short), and its size is 2.5 cm×1.2 cm. Specifically, polymethyl methacrylate (PMMA) is a polymer material with high light transmittance, and its light transmittance can reach 92%. In addition, the mechanical strength of polymethyl methacrylate (PMMA) is high, and the tensile and impact resistance of polymethyl methacrylate (PMMA) is 7 to 18 times higher than that of ordinary glass. In addition, the refractive index of the substrate 1 for the light sensing wavelength bands at 400 nm, 550 nm, and 700 nm is less than 1.55. Of course, the present invention is not limited to this, and the substrate 1 can also be made of other materials that have high light transmittance and are not easily damaged.

As shown in Figures 1 and 2, according to an embodiment of the present invention, the coating element 100 mounted on the drone D lens, the coating stack structure is coated (for example: physical sputtering) on the substrate 1 The upper surface. Specifically, the upper surface of the substrate 1 is cleaned and placed in a cavity of an optical coating machine (not shown in the figure), and various parameters of the optical coating machine (such as cavity vacuum, cavity temperature, After the coating rate of the titanium pentoxide film material and the silicon dioxide mold material, the electron gun energy and the oxygen flow rate), the titanium pentoxide coating layer 21 and the silicon dioxide coating film can be plated on the upper surface of the substrate 1 Layer 22 to obtain the plated laminated structure. In this embodiment, the coating laminate structure is thirteen layers of the coating layer 2, and the thirteen layers of the coating layer 2 are composed of seven layers of the titanium pentoxide coating layer 21 and six layers of the silicon dioxide coating layer. The layers 22 are staggered stacked on the upper surface of the substrate 1.

As shown in Figures 1 and 2, the coating element 100 mounted on the drone lens according to the embodiment of the present invention, in this embodiment, the refractive index of each layer of the titanium pentoxide coating layer 21 Is in the range of 2.4 to 2.6; the refractive index of each layer of the silicon dioxide coating layer 22 is in the range of 1.4 to 1.5, and each layer of the titanium pentoxide coating layer 21 and each layer of the silicon dioxide coating The coating thickness of the layer 22 is 0.5 qw to 1.5 qw. qw is the abbreviation of QWOT (Quarter Wavelength Optical Thickness). The coating layer 2 of thirteen layers is formed by alternately stacking the coating layer 21 of titanium pentoxide with a higher refractive index and the coating layer 22 of silicon dioxide with a lower refractive index on the upper surface of the substrate 1 The coating element 100 of the present invention has a lower light reflectivity and a higher light transmittance. The coating element 100 is installed on the lens of the camera system of the drone D. It can be used during daytime and nighttime shooting. Good clarity and visual effects.

As shown in FIG. 3, according to the embodiment of the present invention, the coating element 100 mounted on the drone lens is used to measure the reflectance of the coating element 100 with a spectrum analyzer. The measurement results show that: compared with the substrate 1 (polymethyl Compared with methyl acrylate (PMMA), the reflectance of the coated element 100 can be reduced to less than 2% in the visible light and infrared light regions.

As shown in Figure 4, according to the embodiment of the present invention, the coating element 100 mounted on the drone lens is measured with a spectrum analyzer (the coating laminate structure is only plated on the substrate 1 The penetration rate of the upper surface) and 100A (the coating layered structure is plated on the upper surface and the lower surface of the substrate 1), the measurement angle is 0 degrees. The measurement results show that: compared with the substrate 1 without the coating laminated structure, the coating element 100 has a transmittance of about 94% to 96% in the visible and infrared regions; the coating element 100A is in the visible and infrared regions. The transmittance of the light area is about 96% to 98%.

As shown in Figure 5, according to the embodiment of the present invention, the coating element 100 mounted on the drone lens is used to measure the transmittance of the coating element 100 with a spectrum analyzer. The angle is 45 degrees. The measurement results show that, compared with the substrate 1 without the coating laminated structure, the coating element 100 has a transmittance of about 92% to 98% in the visible light and infrared light regions.

In addition, according to the embodiment of the present invention, the coating element 100 mounted on the drone lens, before the coating element 100 is produced by an optical coating machine, the five layers of each layer of the coating laminate structure are simulated by software simulation. The coating thickness of the titanium oxide coating layer 21 and the coating thickness of each layer of the silicon dioxide coating layer 22 are obtained to obtain that the light reflectivity is higher than 4% when the reflection angle is 0 degrees, and when the reflection angle is 50 degrees A simulation result of the coating element 100 higher than 6%, and then according to the coating thickness of each layer of the titanium pentoxide coating layer 21 and the coating thickness of each layer of the silicon dioxide coating layer 22 in the simulation result, Various parameters of the optical coating machine are set to manufacture the coating element 100. Specifically, before fabricating the coated element 100, an optical thin film design software (for example, TFCalc optical thin film design software) is used to design the substrate 1 and the coated laminated structure of the coated element 100 according to the requirement of light reflectivity.

式中I₀(λ_k)為理想目標值，I(λ_k)為設計值，

為在波長λ_k上的權重，當F變小時表示有改善，優化方向可朝此繼續下去一直到滿意為止。薄膜光學厚度優化處理所用的數學方法，例如：簡形優化法(simplex method)、最小平方調適法(least-square fit or damped least squares)或合成法。待環境參數及薄膜層數參數皆建立完成後，設定優化參數以模擬該鍍膜元件100的反射率，而得到該模擬結果。一旦該模擬結果達到光反射率的需求，依據該模擬結果中的該鍍膜疊層結構之每層的該五氧化三鈦鍍膜層21的鍍膜厚度及每層的該二氧化矽鍍膜層22的鍍膜厚度，設定好光學鍍膜機的各項參數(包括：腔體真空度、腔體溫度、五氧化三鈦膜材及二氧化矽模材的鍍膜速率、電子槍能量及通氧量等)，即可製作出光反射率符合需求的該鍍膜元件100。 Continuing, the parameters required to be set in the optical film design software include environmental parameters and film layer number parameters. Environmental parameters include reference wavelength, light source type selection, incident light angle, incident medium, substrate material selection, output medium and other parameters. The parameter of the number of film layers is designed based on the equivalent film stack as the optical thickness, and the optical thickness of the film is optimized after the preliminary expected spectrum is obtained. The film optical thickness optimization process includes changing the optical thickness (or refractive index) of each film layer in the initial design, and using mathematical methods to determine whether the film optical thickness has improved. The improvement index can be set up with an evaluation function F, as shown below:

Where I ₀ (λ _k ) is the ideal target value, I (λ _k ) is the design value,

For the weight on the wavelength λ _k , when F becomes smaller, it means that there is improvement, and the optimization direction can continue until it is satisfied. The mathematical method used in the optimization of the optical thickness of the film, such as: simplex method, least-square fit or damped least squares, or composite method. After the environmental parameters and the film layer number parameters are established, the optimized parameters are set to simulate the reflectivity of the coating element 100, and the simulation result is obtained. Once the simulation result reaches the requirement of light reflectivity, the coating thickness of each layer of the titanium pentoxide coating layer 21 and the coating film of each layer of the silicon dioxide coating layer 22 of the coating stack structure in the simulation result Thickness, set the various parameters of the optical coating machine (including: cavity vacuum, cavity temperature, coating rate of titanium pentoxide film and silicon dioxide mold material, electron gun energy and oxygen flow, etc.), you can The coated element 100 whose light reflectivity meets the requirements is manufactured.

With the above structure, the coated element 100 of the present invention is made of a material that is not easily damaged (for example, polymethyl methacrylate (PMMA)) because the substrate 1 is not easily damaged. The membrane element 100 is installed in the lens of the camera system of the UAV D to protect the lens of the camera system and reduce the probability of damage to the lens of the camera system. Moreover, the substrate 1 and the coated laminated structure of the present invention have the characteristics of high transmittance, so that the coated element 100 has the characteristics of low reflectivity and high transmittance in the visible light and reflected light regions. The coated element 100 Installed on the lens of the UAV D's photography system, it has good clarity and visual effects during daytime and night shooting.

The above descriptions and descriptions are only descriptions of the preferred embodiments of the present invention. Those with general knowledge of this technology should make other modifications based on the scope of patent applications defined below and the above descriptions, but these modifications should still be made. It is the spirit of the present invention and falls within the scope of the rights of the present invention.

100: Coated components

D: drone

Claims (5)

A coating element installed on an unmanned aerial vehicle lens, the coating element comprising: a substrate, the light sensing wavelength of the substrate is between 400nm and 950nm; and a coating laminated structure, which is coated on the upper surface of the substrate, the The coating laminated structure is a plurality of coating layers, the coating layers of the plurality of layers include a plurality of titanium pentoxide coating layers and a plurality of silicon dioxide coating layers, and the coating layers of the plurality of coating layers are the pentoxide The trititanium pentoxide coating layer and the silicon dioxide coating layer are alternately stacked, and the coating thickness of the trititanium pentoxide coating layer and the silicon dioxide coating layer of each layer is a multiple of a quarter of the standard light wavelength , The coating thickness of the titanium pentoxide coating layer of each layer is greater than the coating thickness of the silicon dioxide coating layer of each layer, wherein the target light wavelength is the wavelength of visible light or infrared light, and the coating element is The light reflectivity of all the target light wavelengths with a wavelength between 400nm and 950nm is higher than 4% when the reflection angle is 0 degrees, and higher than 6% when the reflection angle is 50 degrees, in order to reflect visible light and Infrared light. The coating element according to claim 1, wherein the refractive index of the substrate at 400 nm, 550 nm and 700 nm for the light sensing wavelength band is less than 1.55. The coating element according to claim 1, wherein the refractive index of each layer of the titanium pentoxide coating layer is in the range of 2.4 to 2.6. The coating element according to claim 1, wherein the refractive index of the silicon dioxide coating layer of each layer is in the range of 1.4 to 1.5. The coating element according to claim 1, wherein the coating element simulates the coating layer of the titanium pentoxide on each layer of the coating laminate structure in a software simulation mode The coating thickness of each layer of the silicon dioxide coating layer and the coating thickness of the silicon dioxide coating layer of each layer are obtained. The light reflectivity is higher than 4% when the reflection angle is 0 degrees and the coating element is higher than 6% when the reflection angle is 50 degrees. According to a simulation result of, the coated element is manufactured according to the simulation result.

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