Active discharging structure for lens condensed trace water vapor

Abstract

The utility model provides an active discharge structure of lens condensed trace water vapor, which comprises a lens barrel and at least one lens assembled in the lens barrel, the lens comprises an effective lens part and a bearing part positioned on the periphery of the effective lens part, and the active discharge structure also comprises a plurality of water guide structures; the water guide structure is formed on the lens barrel and is located at a position corresponding to the bearing part; the water guide structure is of a groove structure; the water guide structure extends to the peripheral part of the lens barrel from the inner side end face, close to the effective lens part, of the lens barrel to the direction away from the effective lens part; the sectional area of one end, adjacent to the effective lens part, of the water guide structure is larger than the sectional area of one end, far away from the effective lens part, of the water guide structure. According to the active drainage structure of the lens condensed trace water, active drainage of trace water can be achieved, and water films or water drops are prevented from being gathered at the junction of the lens barrel and the lens; the shooting effect is improved.

Description

Technical Field

[0001] The present application belongs to the field of lenses, and in particular relates to an active discharge structure for condensing trace amounts of water vapor on a lens. Background Art

[0002] In recent years, the application environment of shooting lenses has become diversified, and the use environment of lenses has become more and more complex, especially when used outdoors. The use environment can be high heat in the desert, high altitude and high cold, and high humidity in the ocean. These special use environments require the lens to have sufficient reliability. When used in the temperature and humidity environment of the ocean, fogging usually occurs when the hot and cold environments switch rapidly. If used for too long, the water vapor adhesion caused by the high temperature and high humidity environment will cause the lens transmittance to change, thereby affecting the image acquisition quality. In order to solve the above problems, lens surface treatment, such as hydrophobic or hydrophilic treatment, is a common practice. However, when the external environment is too harsh or after long-term use, it is inevitable that although the amount of water vapor is not large, the water vapor will form a small amount of water film or water droplets under the action of surface tension, and the water film or water droplets will gather at the junction of the lens barrel and the lens, affecting the shooting effect. Therefore, it is very important to discharge these trace water vapor. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides an active discharge structure for trace water vapor condensed on a lens, which can realize the active discharge of trace water.

[0004] In order to achieve the above-mentioned purpose, the utility model provides an active discharge structure for trace water vapor condensed on a lens, comprising a lens barrel and at least one lens assembled in the lens barrel, wherein the lens comprises an effective mirror portion and a supporting portion located at the periphery of the effective mirror portion, and further comprises a plurality of water guiding structures; the water guiding structures are formed on the lens barrel and are located at positions corresponding to the supporting portions; the water guiding structures are in the form of groove structures; and the water guiding structures extend from the inner end surface of the lens barrel adjacent to the effective mirror portion to the outer periphery of the lens barrel in a direction away from the effective mirror portion; the cross-sectional area of ​​one end of the water guiding structure adjacent to the effective mirror portion is larger than the cross-sectional area of ​​one end of the water guiding structure away from the effective mirror portion.

[0005] According to an embodiment of the present application, the water-conducting structures are evenly distributed on the lens barrel along the circumference of the lens barrel; and the number of the water-conducting structures is more than 3.

[0006] According to one embodiment of the present application, the extension direction of the water-conducting structure includes along a straight line, along a curve, or along a bending line.

[0007] According to one embodiment of the present application, when the water-guiding structure extends in a straight line, an end of the water-guiding structure adjacent to the effective mirror portion and an end of the water-guiding structure away from the effective mirror portion are on the same horizontal plane; when the water-guiding structure extends in a curve or a bending line, an end of the water-guiding structure adjacent to the effective mirror portion is higher than an end of the water-guiding structure away from the effective mirror portion, or an end of the water-guiding structure adjacent to the effective mirror portion is lower than an end of the water-guiding structure away from the effective mirror portion.

[0008] According to one embodiment of the present application, when the cross-sectional shape of the water-guiding structure perpendicular to the extension direction of the water-guiding structure is rectangular, the side length of the cross-sectional shape of one end of the water-guiding structure adjacent to the effective mirror portion of the lens is greater than the corresponding side length of the cross-sectional shape of one end of the water-guiding structure away from the effective mirror portion of the lens; the area of ​​the cross-sectional shape of the water-guiding structure along the extension direction of the water-guiding structure gradually decreases.

[0009] According to one embodiment of the present application, when the cross-sectional shape of the water-guiding structure perpendicular to the extension direction of the water-guiding structure is circular, the radius of the cross-sectional shape of one end of the water-guiding structure adjacent to the effective mirror portion of the lens is larger than the radius of the cross-sectional shape of one end of the water-guiding structure away from the effective mirror portion of the lens; the area of ​​the cross-sectional shape of the water-guiding structure along the extension direction of the water-guiding structure gradually decreases.

[0010] According to one embodiment of the present application, a hydrophilic layer is formed on the inner surface of the water-conducting structure.

[0011] The utility model adopts the above technical solution, so that it has the following beneficial effects:

[0012] A water-guiding structure is formed on the lens barrel at a position corresponding to the supporting portion. The gradually decreasing diameter of the water-guiding structure utilizes the capillary siphon effect. Under the action of surface tension of water, the smaller the diameter of the water-guiding structure, the more obvious the hydrophilic effect between water molecules and the water-guiding structure. The gradient of the diameter change of the water-guiding structure can control the flow direction of water, thereby realizing the active discharge of trace water, preventing water film or water droplets from gathering at the junction of the lens barrel and the lens, and improving the shooting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1This is a schematic diagram of the structure of a lens according to an embodiment of the utility model;

[0015] Figure 2 This is a top view of an active exhaust structure for a trace amount of water vapor condensed on a lens according to a first embodiment of the utility model;

[0016] Figure 3 This is a three-dimensional diagram of an active exhaust structure for trace water vapor condensed on a lens according to the first embodiment of the utility model;

[0017] Figure 4 This is a top view of an active exhaust structure for trace water vapor condensed on a lens according to a second embodiment of the utility model;

[0018] Figure 5 This is a three-dimensional diagram of an active exhaust structure for trace water vapor condensed on a lens according to a second embodiment of the present utility model.

[0019] Description of Figure Numbers:

[0020] 1- Lens;

[0021] 11-effective mirror part; 12-supporting part;

[0022] 2- Water-conducting structure;

[0023] 3- Lens barrel. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions 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 making creative work are within the scope of protection of this application.

[0025] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0026] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0027] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal way unless explicitly defined in this article.

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The features, principles and other aspects of the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] Exemplary Embodiments

[0030] See also Figure 1 to Figure 5 An active discharge structure for trace water vapor condensed on a lens in an exemplary embodiment of the present application comprises a lens barrel 3 and at least one lens 1 assembled in the lens barrel 3, wherein the lens 1 comprises an effective mirror portion 11 and a supporting portion 12 located at the periphery of the effective mirror portion 11, and further comprises a plurality of water guiding structures 2; the water guiding structures 2 are formed on the lens barrel 3 and are located at positions corresponding to the supporting portions 12; the water guiding structures 2 are groove structures; and the water guiding structures 2 extend from the inner end surface of the lens barrel 3 adjacent to the effective mirror portion 11 to the outer periphery of the lens barrel 3 in a direction away from the effective mirror portion 11; the cross-sectional area of ​​one end of the water guiding structure 2 adjacent to the effective mirror portion 11 is larger than the cross-sectional area of ​​one end of the water guiding structure 2 away from the effective mirror portion 11.

[0031] A water-guiding structure 2 is formed on the lens barrel 3 at a position corresponding to the supporting portion 12. The gradually decreasing diameter of the water-guiding structure 2 utilizes the capillary siphon effect. Under the action of surface tension of water, the smaller the diameter of the water-guiding structure 2, the more obvious the hydrophilic effect between water molecules and the water-guiding structure 2. The gradient of the diameter change of the water-guiding structure 2 can control the flow direction of water, thereby realizing the active discharge of trace water, preventing water film or water droplets from gathering at the junction of the lens barrel 3 and the lens 1, and improving the shooting effect.

[0032] In an exemplary embodiment, the water-conducting structures 2 are evenly distributed on the lens barrel 3 along the circumference of the lens barrel 3 ; and the number of the water-conducting structures 2 is more than three.

[0033] The number of water-conducting structures 2 determines the speed of water conduction. In order to remove water vapor as quickly as possible, the number of water-conducting structures 2 needs to be certain and distributed as evenly as possible. The number and distribution will improve the effect.

[0034] In an exemplary embodiment, the extension direction of the water guiding structure 2 includes along a straight line, along a curve, or along a bending line.

[0035] The straight line design is easier to process. The purpose of the curved design is to increase the path length in contact with water molecules, which is conducive to the discharge of more water vapor.

[0036] In an exemplary embodiment, when the water guiding structure 2 extends in a straight line, an end of the water guiding structure 2 adjacent to the effective mirror portion 11 and an end of the water guiding structure 2 away from the effective mirror portion 11 are on the same horizontal plane; when the water guiding structure 2 extends in a curve or a bending line, an end of the water guiding structure 2 adjacent to the effective mirror portion 11 is higher than an end of the water guiding structure 2 away from the effective mirror portion 11, or an end of the water guiding structure 2 adjacent to the effective mirror portion 11 is lower than an end of the water guiding structure 2 away from the effective mirror portion 11.

[0037] The present application is not limited to the size of the lens itself. In order to effectively and actively export water vapor, the structure needs to be considered together with the external structure of the lens. The application scenarios considered in the present application are mainly when the drone is working in a high-humidity ocean, the surface of the shooting lens is prone to condensation of water vapor, and the main shooting lens includes the outer diameter size of the external structure. Therefore, the design space of the water-guiding structure 2 is relatively large. In the actual setting, according to the relationship between the lens and the mechanical components, the angle design must be coordinated with the overall design on the one hand, and be conducive to the export of moisture on the other hand.

[0038] In an exemplary embodiment, the cross-sectional shape of the water guiding structure 2 perpendicular to the extending direction of the water guiding structure 2 includes a rectangle, a circle, or a polygon other than a rectangle.

[0039] In an exemplary embodiment, when the cross-sectional shape of the water guiding structure 2 perpendicular to the extension direction of the water guiding structure 2 is rectangular, the side length of the cross-sectional shape of one end of the water guiding structure 2 adjacent to the effective mirror portion 11 of the lens 1 is greater than the corresponding side length of the cross-sectional shape of one end of the water guiding structure 2 away from the effective mirror portion 11 of the lens 1; the area of ​​the cross-sectional shape of the water guiding structure 2 along the extension direction of the water guiding structure 2 gradually decreases.

[0040] In an exemplary embodiment, when the cross-sectional shape of the water guiding structure 2 perpendicular to the extension direction of the water guiding structure 2 is circular, the radius of the cross-sectional shape of one end of the water guiding structure 2 adjacent to the effective mirror portion 11 of the lens 1 is larger than the radius of the cross-sectional shape of one end of the water guiding structure 2 away from the effective mirror portion 11 of the lens 1; the area of ​​the cross-sectional shape of the water guiding structure 2 along the extension direction of the water guiding structure 2 gradually decreases.

[0041] In an exemplary embodiment, the inner surface of the water-conducting structure 2 forms a hydrophilic layer.

[0042] The inner surface of the water-conducting structure 2 may be subjected to appropriate surface treatment or roughness change to enhance the interaction force with water molecules to form a hydrophilic layer. The surface treatment may be plasma treatment, chemical reagent treatment, or coating.

[0043] Among them, plasma treatment can form a dense and uniform oxide layer on the surface of the material and introduce a large number of hydrophilic groups. This method is suitable for surface modification of various materials, such as metals, polymers, ceramics, etc. Plasma has high chemical activity and generally does not produce toxic substances or pollutants. It can achieve surface hydrophilic modification without affecting the performance of the material matrix. It is a green surface hydrophilic modification method.

[0044] Chemical reagent treatment includes acid-base treatment and solvent treatment.

[0045] Acid-base treatment is to immerse the material in an acid or alkali solution to cause a chemical reaction on its surface and introduce a large number of hydrophilic groups. This method is suitable for surface modification of metals and their composite materials.

[0046] Solvent treatment is to immerse the material in an organic solvent to cause a chemical reaction on its surface and introduce a large number of hydrophilic groups. This method is suitable for surface modification of polymers and their composites.

[0047] Coating treatment is to apply a hydrophilic coating on the surface of the material so that the surface of the material is evenly covered with a layer of highly hydrophilic coating.

[0048] The effect of the hydrophilic layer is to improve the hydrophilicity of the surface. The inner surface of the water-conducting structure 2 is treated by chemical arc discharge to improve the surface hydrophilicity. The surface energy is improved, which is beneficial to the water vapor lifting effect. The effect of the surface roughening treatment can increase the contact area with water vapor, which is beneficial to the water vapor lifting effect.

[0049] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of water-conducting structures 2 can be changed to obtain the various results and advantages described in this specification. For example, although four water-conducting structures 2 are used as an example in the embodiment, the active discharge structure for trace water vapor condensed from the lens is not limited to four water-conducting structures 2. If necessary, the active discharge structure for trace water vapor condensed from the lens can also include other numbers of water-conducting structures 2.

[0050] The theoretical basis of the utility model is a method in which a capillary tube utilizes surface tension to absorb liquid.

[0051] The absorption of liquid by capillaries due to surface tension is a common phenomenon in physics.

[0052] Conditions for capillary phenomena:

[0053] 1. Liquid infiltration, that is, water molecules in water vapor or water film must be wettable with the lens barrel 3 material to produce adhesion. The surface of the water-conducting structure 2 in the design must have a certain degree of roughness, and the material surface cannot be too low.

[0054] 2. Capillary force: the force in the capillary that allows the wetting liquid to naturally (actively) rise in the tube wall.

[0055] 3. The magnitude of the force is proportional to the surface tension of the liquid and inversely proportional to the capillary radius. The formula is: h = 2γcosθ / ρgr; where h represents the height of the liquid surface, γ represents the surface tension, θ represents the contact angle, ρ represents the liquid density, g represents the acceleration of gravity, and r represents the capillary radius. From the expression, we can see that the magnitude of the force that produces active drainage is proportional to the surface tension of the liquid, inversely proportional to the capillary radius, and inversely proportional to the density of the liquid.

[0056] From the above analysis, we know that if an active drainage structure is to be realized, the inner surface treatment of the structure and the microstructure of the capillary are a parameter. Secondly, the capillary is designed in the form of radius variation, which can produce changes in pressure difference to achieve active drainage effect.

[0057] The camera is used in a natural environment, the liquid is water vapor, and the density and surface energy can be considered as constant values. Therefore, to improve the active drainage ability, one is to set the contact angle between water molecules and the resin material, and the second is to set the size of the capillary microstructure. The capillary radius and structure are the main design considerations in this application.

[0058] During injection molding, a water-conducting structure 2 is formed on the surface of the lens barrel 3. The water-conducting structure 2 can be in a triangular shape. The width in the direction close to the effective mirror portion 11 of the lens 1 is wider than that in the direction away from the effective mirror portion 11 of the lens 1, that is, the width ratio A / B>1. Depending on the size of the lens and the processing capability, the range of A / B can be greater than 1 and less than 10. The process can be completed during injection molding, or it can be completed through micro-machining methods after the lens barrel 3 is injection-molded, such as laser engraving, etching, etc.

[0059] The number of the water-conducting structures 2 can be more than three according to actual needs without affecting the appearance, and all of them are distributed on the edge of the lens barrel 3 .

[0060] In order to better realize the degassing of water vapor, the water-conducting structure 2 can be roughened. The processing accuracy can be slightly reduced during the design and processing of the injection molding mold. Compared with other parts, for example, the surface roughness of other parts is 10nm, which can be designed to be 20nm or higher here. In addition, it can also not be completed in the injection molding. For example, laser engraving can be performed on the lens barrel 3 to form a relatively rougher interface.

[0061] A specific embodiment of an active discharge structure for trace water vapor condensed on a lens applicable to the above-mentioned embodiment will be further described below with reference to the accompanying drawings. Specific embodiment 1

[0063] Figure 2 and Figure 3 This is a structural schematic diagram of Example 1 of an active discharge structure for trace water vapor condensed on a lens of the present application. An active discharge structure for trace water vapor condensed on a lens comprises a lens barrel 3 and at least one lens 1 assembled in the lens barrel 3, wherein the lens 1 comprises an effective mirror portion 11 and a supporting portion 12 located at the outer periphery of the effective mirror portion 11, and further comprises four water-guiding structures 2; the water-guiding structures 2 are formed on the lens barrel 3 and are located at positions corresponding to the supporting portions 12; the water-guiding structures 2 are groove structures; and the water-guiding structures 2 extend from the inner end surface of the lens barrel 3 adjacent to the effective mirror portion 11 to the outer periphery of the lens barrel 3 in a direction away from the effective mirror portion 11; the cross-sectional area of ​​one end of the water-guiding structure 2 adjacent to the effective mirror portion 11 is larger than the cross-sectional area of ​​one end of the water-guiding structure 2 away from the effective mirror portion 11.

[0064] The water-conducting structures 2 are evenly distributed on the lens barrel 3 along the circumference of the lens barrel 3 .

[0065] The extension direction of the water-conducting structure 2 is along a straight line.

[0066] The cross-section of the water-conducting structure 2 perpendicular to the extending direction of the water-conducting structure 2 is rectangular.

[0067] When the cross-sectional shape of the water-guiding structure 2 perpendicular to the extension direction of the water-guiding structure 2 is rectangular, the side length of the cross-sectional shape of one end of the water-guiding structure 2 adjacent to the effective mirror portion 11 is greater than the corresponding side length of the cross-sectional shape of one end of the water-guiding structure 2 away from the effective mirror portion 11; the side length of the cross-sectional shape of the water-guiding structure 2 along the extension direction of the water-guiding structure 2 changes linearly.

[0068] The inner surface of the water-conducting structure 2 forms a hydrophilic layer.

[0069] Figure 2 and Figure 3 The schematic structural diagram of an active discharge structure for trace water vapor condensed on a lens in Example 1 is shown, and it can be seen that the lens barrel 3 is evenly provided with four water guide structures 2 extending in a straight line along the circumferential direction. Specific embodiment 2

[0071] Figure 4 and Figure 5 This is a structural schematic diagram of Example 2 of an active discharge structure for trace water vapor condensed on a lens of the present application. An active discharge structure for trace water vapor condensed on a lens comprises a lens barrel 3 and at least one lens 1 assembled in the lens barrel 3, wherein the lens 1 comprises an effective mirror portion 11 and a supporting portion 12 located at the outer periphery of the effective mirror portion 11, and further comprises four water-guiding structures 2; the water-guiding structures 2 are formed on the lens barrel 3 and are located at positions corresponding to the supporting portions 12; the water-guiding structures 2 are groove structures; and the water-guiding structures 2 extend from the inner end surface of the lens barrel 3 adjacent to the effective mirror portion 11 to the outer periphery of the lens barrel 3 in a direction away from the effective mirror portion 11; the cross-sectional area of ​​one end of the water-guiding structure 2 adjacent to the effective mirror portion 11 is larger than the cross-sectional area of ​​one end of the water-guiding structure 2 away from the effective mirror portion 11.

[0072] The water-conducting structures 2 are evenly distributed on the lens barrel 3 along the circumference of the lens barrel 3 .

[0073] The extension direction of the water-conducting structure 2 is along the curve.

[0074] The cross-section of the water-conducting structure 2 perpendicular to the extending direction of the water-conducting structure 2 is rectangular.

[0075] When the cross-sectional shape of the water-guiding structure 2 perpendicular to the extension direction of the water-guiding structure 2 is rectangular, the side length of the cross-sectional shape of one end of the water-guiding structure 2 adjacent to the effective mirror portion 11 is greater than the corresponding side length of the cross-sectional shape of one end of the water-guiding structure 2 away from the effective mirror portion 11; the side length of the cross-sectional shape of the water-guiding structure 2 along the extension direction of the water-guiding structure 2 changes linearly.

[0076] The inner surface of the water-conducting structure 2 forms a hydrophilic layer.

[0077] Figure 4 and Figure 5 A schematic structural diagram of an active discharge structure for trace water vapor condensed on a lens according to Embodiment 2 is shown, and it can be seen that the lens barrel 3 is evenly provided with four water guide structures 2 extending along a curve along the circumferential direction.

[0078] In Example 1 and Example 2:

[0079] The cross-sectional width of the end of the water-conducting structure 2 adjacent to the effective mirror portion 11 is 2 mm, and the cross-sectional width of the end of the water-conducting structure 2 away from the effective mirror portion 11 is 1 mm.

[0080] In the experiment, a drop of water is placed on the inner edge of the water-conducting structure 2 , and it can be observed that the water drop is quickly siphoned into the water-conducting structure 2 .

[0081] h=2γcosθ / ρgr; wherein, h represents the height of the liquid surface rising, γ represents the surface tension, θ represents the contact angle, ρ represents the liquid density, g represents the gravitational acceleration, and r represents the radius of the capillary.

[0082] Theoretically: Without considering other variables, the water level in a capillary glass tube with a radius of 1mm can be increased or risen by about 14mm, that is, 0.011g of water can be extracted.

[0083] The water output effects of the water guide structures 2 with different widths are shown in Table 1:

[0084] width Number of structures Water output Number of structures Water output Number of structures Water output Number of structures Water output Number of structures Water output 1mm 1 0.01g 2 0.02g 3 0.03g 4 0.04g 5 0.05g 2mm 1 0.02g 2 0.04g 3 0.06g 4 0.08g 5 0.10g 3mm 1 0.03g 2 0.06g 3 0.09g 4 0.12g 5 0.15g

[0085] Table 1

[0086] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, improvements, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An active exhaust structure for trace water vapor condensed on a lens, comprising a lens barrel and at least one lens assembled in the lens barrel, wherein the lens comprises an effective mirror portion and a supporting portion located at the periphery of the effective mirror portion, characterized in that: It also includes a plurality of water-guiding structures; the water-guiding structures are formed on the lens barrel and located at a position corresponding to the supporting portion; the water-guiding structures are in the form of groove structures; and the water-guiding structures extend from the inner end surface of the lens barrel adjacent to the effective mirror portion to the outer periphery of the lens barrel in a direction away from the effective mirror portion; the cross-sectional area of ​​one end of the water-guiding structure adjacent to the effective mirror portion is larger than the cross-sectional area of ​​one end of the water-guiding structure away from the effective mirror portion.

2. The active exhaust structure for the trace amount of water vapor condensed on the lens according to claim 1, characterized in that: The water-conducting structures are evenly distributed on the lens barrel along the circumference of the lens barrel; the number of the water-conducting structures is more than 3.

3. The active exhaust structure for the trace water vapor condensed on the lens according to claim 2, characterized in that: The extension direction of the water-conducting structure includes along a straight line, along a curve or along a bending line.

4. The active exhaust structure for the trace amount of water vapor condensed on the lens according to claim 1, characterized in that: When the water-guiding structure extends in a straight line, an end of the water-guiding structure adjacent to the effective mirror portion and an end of the water-guiding structure away from the effective mirror portion are on the same horizontal plane; when the water-guiding structure extends in a curve or a bending line, an end of the water-guiding structure adjacent to the effective mirror portion is higher than an end of the water-guiding structure away from the effective mirror portion, or an end of the water-guiding structure adjacent to the effective mirror portion is lower than an end of the water-guiding structure away from the effective mirror portion.

5. The active exhaust structure for the trace water vapor condensed on the lens according to claim 1, characterized in that: When the cross-sectional shape of the water-guiding structure perpendicular to the extension direction of the water-guiding structure is rectangular, the side length of the cross-sectional shape of one end of the water-guiding structure adjacent to the effective mirror portion of the lens is greater than the corresponding side length of the cross-sectional shape of one end of the water-guiding structure away from the effective mirror portion of the lens; the area of ​​the cross-sectional shape of the water-guiding structure along the extension direction of the water-guiding structure gradually decreases.

6. The active exhaust structure for condensed trace water vapor on a lens according to claim 1, characterized in that: When the cross-sectional shape of the water-guiding structure perpendicular to the extension direction of the water-guiding structure is circular, the radius of the cross-sectional shape of one end of the water-guiding structure adjacent to the effective mirror portion of the lens is greater than the radius of the cross-sectional shape of one end of the water-guiding structure away from the effective mirror portion of the lens; the area of ​​the cross-sectional shape of the water-guiding structure along the extension direction of the water-guiding structure gradually decreases.

7. The active exhaust structure for trace water vapor condensed on a lens according to any one of claims 1 to 6, characterized in that: A hydrophilic layer is formed on the inner surface of the water-conducting structure.

Images