Protective cover and fog view screen

Abstract

The utility model provides a protective cover and a fog view screen, the protective cover is applied to the fog view screen, and the protective cover comprises a cover body; one end of the damping rotating structure is connected with the cover body, and the other end of the damping rotating structure is used for being connected with a shell of the fog view screen, so that the cover body is rotationally connected with the shell, and the damping rotating structure has a hovering state. The protective cover and the fog view screen are simple in structure, high in space utilization rate and convenient to manufacture, the dustproof effect requirement can be effectively met, and the service life of the fog view screen is ensured.

Description

Technical Field

[0001] This application relates to the technical field of fog vision screens, and in particular to a protective cover and a fog vision screen. Background Art

[0002] The fog vision screen, also known as a far-image light screen, is based on the Birdbath (coaxial air guide) optical design principle and optical technology. It turns a close-range image into a long-distance scene, reduces imaging lag, thereby reducing the pressure on the eyeballs, and thus eliminates the possibility of myopia at the source. Currently, the observation windows of such products are inclined at 40° to 50° with the horizontal plane, so they are prone to reflecting external environmental light. In some technologies, a protective cover is provided on the housing of the fog vision screen to block light, but most of the protective covers are fixed, which not only occupies a large space but also makes the observation window prone to dust accumulation. Therefore, there is an urgent need for a protective cover with high space utilization and effective dust prevention. Summary of the Utility Model

[0003] In view of this, the purpose of this application is to propose a protective cover and a fog vision screen.

[0004] In the first aspect of this application, a protective cover is provided, which is applied to a fog vision screen and includes: a cover body; a damping rotation structure, one end of which is connected to the cover body and the other end is used to connect the housing of the fog vision screen, so that the cover body is rotatably connected to the housing and has a hovering state.

[0005] In some embodiments, the cover body includes a transverse plate, and longitudinal plates are respectively connected to the opposite sides of the transverse plate. A damping rotation structure is connected to the bottom of each longitudinal plate.

[0006] In some embodiments, a curved plate is connected to one side of the transverse plate, and the curved plate is perpendicular to the longitudinal plate.

[0007] In some embodiments, a plurality of first reinforcing ribs are provided at intervals on the inner side of the curved plate, and a plurality of second reinforcing ribs are provided at intervals on the inner side of the longitudinal plate.

[0008] In some embodiments, a buckle groove is provided on the other side of the transverse plate, and a magnetic attraction sheet is provided on the inner side of the transverse plate. The magnetic attraction sheet is arranged close to the buckle groove and is used to connect an external device.

[0009] In some embodiments, the damping rotation structure includes: a first connecting piece, which is connected to the longitudinal plate; a second connecting piece, which is used to connect the housing; and a damping rotating shaft, one end of which is connected to the first connecting piece and the other end is connected to the second connecting piece.

[0010] In some embodiments, a first limiting groove is provided at the bottom of the longitudinal plate, and the first connecting piece is fitted in the first limiting groove and is connected to the first limiting groove by bolts.

[0011] In some embodiments, the longitudinal plate is triangular in shape, the first connecting piece is circular in shape, the second connecting piece includes a plurality of connecting claws arranged in a circumferential array, the first connecting piece is provided with a first connecting hole, the connecting claws are provided with second connecting holes, and the first connecting hole and the second connecting hole are arranged in a staggered manner.

[0012] In a second aspect of the present application, a fog vision screen is provided, which includes a housing. An observation window is provided inside the housing. The top of the housing is rotatably connected with the protective cover as described in the first aspect above, so that the protective cover shields the observation window.

[0013] In some embodiments, the top of the housing is arc-shaped and matches the curved plate of the protective cover.

[0014] In some embodiments, second limiting grooves are respectively provided at the top parts of the opposite sides of the housing. Through holes are provided in the second limiting grooves. The damping rotating shaft of the damping rotating structure penetrates through the through holes. The second connecting piece of the damping rotating structure is fitted in the second limiting grooves and is connected with the second limiting grooves by bolts.

[0015] In some embodiments, third limiting grooves are respectively provided at the top parts of the opposite sides of the housing. The second limiting grooves are provided in the third limiting grooves. The fog vision screen further includes a cover plate, and the cover plate is fitted in the third limiting grooves.

[0016] As can be seen from the above, the present application provides a protective cover and a fog vision screen. The protective cover is applied to the fog vision screen and includes a cover body; a damping rotating structure, one end of which is connected to the cover body and the other end is used to connect the housing of the fog vision screen, so that the cover body is rotatably connected to the housing. In this way, when the fog vision screen is not in use, the protective cover can be closed. On the one hand, the occupied space can be reduced and the space utilization rate can be improved. On the other hand, impurities can be prevented from accumulating on the observation window of the fog vision screen, playing a role in dust prevention and improving the service life; the damping rotating structure enables the protective cover to have a hovering state. In this way, when the fog vision screen is in use, the dust-proof cover can be opened and fixed, which does not affect the user's viewing and can also play a role in blocking light; the protective cover and the fog vision screen have a simple structure, a high space utilization rate, are easy to manufacture, can effectively meet the dust-proof effect requirements, and ensure the service life of the fog vision screen. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 This is the front view of a protective cover in an embodiment of the present application;

[0019] Figure 2 This is the side view of the cover body in an embodiment of the present application;

[0020] Figure 3 This is the side view of the damping rotation structure in an embodiment of the present application;

[0021] Figure 4 This is the schematic explosion structure diagram of a fog vision screen in an embodiment of the present application;

[0022] Figure 5 This is the side view of the hovering state of the fog vision screen in an embodiment of the present application;

[0023] Figure 6 This is the side view of the cooperation between the fog vision screen and an external device in an embodiment of the present application.

[0024] Reference numerals: 1, cover body; 1-1, horizontal plate; 1-2, vertical plate; 1-3, curved plate; 1-4, first reinforcing rib; 1-5, second reinforcing rib; 1-6, handle groove; 1-7, magnetic sheet; 1-8, first limiting groove; 2, damping rotation structure; 2-1, first connecting piece; 2-2, second connecting piece; 2-3, damping rotating shaft; 2-4, first connecting hole; 2-5, second connecting hole; 3, housing; 3-1, second limiting groove; 3-2, through hole; 3-3, third limiting groove; 4, observation window; 5, cover plate; 6, external device. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to specific embodiments and the accompanying drawings.

[0026] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the ordinary meanings understood by those of ordinary skill in the field to which the present application belongs. The "first", "second", and similar terms used in the embodiments of the present application do not indicate any order, quantity, or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0027] The fog vision screen, also known as the far-image light screen, is based on the Birdbath (coaxial air guide) optical design principle and optical technology. It turns a close-range image into a distant scene, reduces imaging lag, thereby reducing the pressure on the eyeballs, and thus eliminates the possibility of myopia at the source.

[0028] At the bottom of the fog vision screen, there is a high-definition and high-brightness display screen hidden. The image on this display screen is reflected by a unique spectroscope, changing the light propagation path. It is reflected by a concave mirror at the back and becomes a virtual image that is pulled away and magnified. The light reflected by this concave mirror passes through the spectroscope again and enters the user's eyes. This spectroscope uses advanced coating technology to ensure that the light entering the human eye has a spectrum similar to natural light, providing an invisible layer of protection for the user's eyes. Therefore, when using the fog vision screen, what the user actually sees is a virtual image located in the distance, giving the feeling as if being in a cinema.

[0029] The unique beam modulation technology of the fog vision screen cleverly avoids the direct entry of dazzling electronic light into the eyes, but gently reflects it into the eyes. It can be said that with its unique charm, the fog vision screen can almost replace the positions of televisions and projectors. With just less than 1 square meter of desktop space, it can instantly turn the environment into a large classroom like a cinema or an online course. Multiple studies have confirmed that this subtle change not only helps reduce the incidence of myopia but also effectively alleviates and even improves dry eye symptoms.

[0030] The fog vision screen can also be fitted with a ring screen imaging display according to the curvature of the eyeball, and uses a digital defocus algorithm to achieve myopic defocus protection for the main field of view and the peripheral field of view of the retina, effectively thickening the choroid of the fundus, thereby reducing the development and progression of myopia.

[0031] Currently, the observation windows of such products are all inclined at 40° to 50° with the horizontal plane, so it is easy to reflect external environmental light, affecting the user's visual experience. In some technologies, a protective cover is set on the housing of the fog vision screen to block light, but most of the protective covers are fixed, which not only occupies a large space but also makes the observation window prone to dust accumulation. Frequently wiping the observation window will damage the glass surface coating. Therefore, there is an urgent need for a protective cover with high space utilization and effective dust prevention.

[0032] The following, through specific embodiments and in combination with Figures 1 to 6 to elaborate in detail on the technical solutions of this application.

[0033] In some embodiments of this application, as Figure 1 shown, a protective cover is provided, which is applied to the fog vision screen and includes: a cover body 1; a damping rotation structure 2, one end of which is connected to the cover body 1 and the other end is used to connect the housing 3 of the fog vision screen, so that the cover body 1 is rotatably connected to the housing 3 and has a hovering state.

[0034] The material of the cover 1 is, for example, plastic, etc., and is not specifically limited.

[0035] The damping rotation structure 2 is, for example, a damping rotating shaft 2-3, etc., and is not specifically limited. One end of it is connected to the cover 1, and the other end is used to connect to the housing 3 of the fogging screen, so that the cover 1 is rotatably connected to the housing 3, as Figure 4 shown. In this way, when the fogging screen is not in use, the protective cover can be closed. On the one hand, it can reduce the occupied space and improve the space utilization rate. On the other hand, it can prevent impurities from accumulating on the observation window 4 of the fogging screen, playing a role in dust prevention and improving the service life.

[0036] The damping rotation structure 2 enables the protective cover to have a hovering state. In this way, when using the fogging screen, the dust-proof cover can be rotated to the target angle without affecting the user's viewing, and it can also play a role in blocking light.

[0037] This protective cover has a simple structure, high space utilization rate, and is easy to manufacture, and can effectively meet the dust-proof effect requirements and ensure the service life of the fogging screen.

[0038] In some embodiments, as Figure 1 and Figure 2 shown, the cover 1 includes a horizontal plate 1-1, and longitudinal plates 1-2 are respectively connected to the opposite sides of the horizontal plate 1-1. A damping rotation structure 2 is connected to the bottom of each longitudinal plate 1-2.

[0039] As Figure 2 shown, the cover 1 includes a horizontal plate 1-1 and two longitudinal plates 1-2. As Figure 4 shown, in this way, when the protective cover is opened, it can block the light from the left, right, and top, improving the user experience; a damping rotation structure 2 is connected to the bottom of each longitudinal plate 1-2, so as to ensure a more stable rotational connection between the protective cover and the housing 3.

[0040] In some embodiments, as Figure 1 and Figure 2 shown, a curved plate 1-3 is connected to one side of the horizontal plate 1-1, and the curved plate 1-3 is perpendicular to the longitudinal plate 1-2.

[0041] As Figure 2 shown, a curved plate 1-3 is connected to one side of the horizontal plate 1-1, and the curved plate 1-3 is perpendicular to the longitudinal plate 1-2. As Figure 4 shown, setting the curved plate 1-3 facilitates the cooperation with the top of the housing 3 and has a beautiful shape.

[0042] In some embodiments, as Figure 1 shown, a plurality of first reinforcing ribs 1-4 are arranged at intervals on the inner side of the curved plate 1-3, and a plurality of second reinforcing ribs 1-5 are arranged at intervals on the inner side of the longitudinal plate 1-2.

[0043] AsFigure 1 As shown, a plurality of first reinforcing ribs 1-4 are provided at intervals on the inner side of the curved plate 1-3, and a plurality of second reinforcing ribs 1-5 are provided at intervals on the inner side of the longitudinal plate 1-2. The second reinforcing ribs 1-5 are connected to the transverse plate 1-1 to improve the structural strength of the protective cover.

[0044] In some embodiments, as Figure 1 shown, a buckle groove 1-6 is provided on the other side of the transverse plate 1-1, and a magnetic sheet 1-7 is provided on the inner side of the transverse plate 1-1. The magnetic sheet 1-7 is disposed close to the buckle groove 1-6 for connecting an external device 6.

[0045] As Figure 1 shown, a buckle groove 1-6 is provided on one side of the transverse plate 1-1 to facilitate the user to rotate the protective cover; a magnetic sheet 1-7 is provided on the inner side of the transverse plate 1-1. The magnetic sheet 1-7 can be pasted with an adhesive on one side and spray-painted on the other side. The magnetic sheet 1-7 is disposed close to the edge of the transverse plate 1-1. As Figure 6 shown, the external device 6 can be adsorbed on the top surface of the transverse plate 1-1 in this way to improve the use effect. The external device 6 is, for example, a highlight meter, a camera, etc., and is not specifically limited.

[0046] In some embodiments, as Figure 3 shown, the damping rotation structure 2 includes: a first connecting piece 2-1 connected to the longitudinal plate 1-2; a second connecting piece 2-2 for connecting the housing 3; and a damping rotating shaft 2-3, one end of which is connected to the first connecting piece 2-1 and the other end of which is connected to the second connecting piece 2-2.

[0047] As Figure 3 shown, the damping rotation structure 2 includes a first connecting piece 2-1, a second connecting piece 2-2, and a damping rotating shaft 2-3. As Figure 4 shown, the first connecting piece 2-1 is connected to the longitudinal plate 1-2, the second connecting piece 2-2 is connected to the housing 3, and the damping rotating shaft 2-3, one end of which is connected to the first connecting piece 2-1 and the other end of which is connected to the second connecting piece 2-2. In this way, the rotational connection between the protective cover and the housing 3 can be realized. As Figure 5 shown, by providing the damping rotating shaft 2-3, the protective cover can be rotated to a target angle to achieve a hovering state.

[0048] In some embodiments, as Figure 2 and Figure 4 shown, a first limiting groove 1-8 is provided at the bottom of the longitudinal plate 1-2. The first connecting piece 2-1 is fitted in the first limiting groove 1-8 and is connected to the first limiting groove 1-8 by bolts.

[0049] As Figure 2 shown, a first limiting groove 1-8 is provided at the bottom of the longitudinal plate 1-2. As Figure 4As shown, the first connecting piece 2-1 is fitted into the first limiting groove 1-8 and is bolted to the first limiting groove 1-8 to play a role in fixing and limiting, ensuring the stability of the device.

[0050] In some embodiments, such as Figure 2 and Figure 3 As shown, the shape of the longitudinal plate 1-2 is triangular, the shape of the first connecting piece 2-1 is circular, the second connecting piece 2-2 includes a plurality of connecting claws arranged in a circumferential array, the first connecting piece 2-1 is provided with a first connecting hole 2-4, the connecting claws are provided with second connecting holes 2-5, and the first connecting holes 2-4 and the second connecting holes 2-5 are arranged in a staggered manner.

[0051] Such as Figure 2 As shown, the shape of the longitudinal plate 1-2 is triangular. While playing a role in blocking light, it is convenient to be stored in the housing 3; the shape of the first connecting piece 2-1 is circular. Correspondingly, the shape of the first limiting groove 1-8 is also circular, which is convenient for fitting; the second connecting piece 2-2 includes a plurality of connecting claws arranged in a circumferential array, which is convenient for fitting with the housing 3 and provides an avoidance space for the first connecting piece 2-1 to connect the longitudinal plate 1-2.

[0052] Such as Figure 3 As shown, the first connecting piece 2-1 is provided with a first connecting hole 2-4, for example, the number is three, and they are arranged in a circumferential array for bolt connection of the longitudinal plate 1-2; the connecting claws are provided with second connecting holes 2-5. For example, the second connecting piece 2-2 is provided with three connecting claws, and each end of the connecting claw is provided with a second connecting hole 2-5 for bolt connection of the housing 3; the opening size of the connecting hole is confirmed according to the bolt diameter, and its opening can increase the tapping process and is confirmed according to the bolt specification; the first connecting holes 2-4 and the second connecting holes 2-5 are arranged in a staggered manner, that is, the orthographic projections of the first connecting holes 2-4 and the second connecting holes 2-5 on the first connecting piece 2-1 do not overlap at all, so as to provide a bolt assembly space, and the bolts can be connected from the outside, which is convenient for disassembly and assembly of the protective cover.

[0053] In some embodiments of the present application, such as Figures 4 to 6 As shown, a fog vision screen is provided, including a housing 3. An observation window 4 is provided inside the housing 3. The top of the housing 3 is rotatably connected with a protective cover as described in any of the above embodiments, so that the protective cover shields the observation window 4.

[0054] Such as Figure 4 As shown, the fog vision screen includes a housing 3. The material of the housing 3 is, for example, plastic, etc., and is not specifically limited, which plays a protective role.

[0055] The material of the observation window 4 is, for example, glass, with an optical film layer on the surface, which is not specifically limited. The observation window 4 is tilted in the housing 3 for the user to observe the screen, and its tilt angle is 40° to 50°, which is not specifically limited.

[0056] The side of the housing 3 is provided with an opening, and a protective cover is rotatably connected to the top. When the protective cover is against the opening, the observation window 4 can be blocked. When the protective cover is separated from the opening, the observation window 4 can be exposed.

[0057] In some embodiments, such as Figure 4 As shown in FIG. 1 , the top of the housing 3 is arc-shaped, which matches the curved plates 1-3 of the protective cover and has a beautiful shape.

[0058] In some embodiments, such as Figure 4 As shown in , the inner side wall of the housing 3 is provided with a vertical limit strip, as shown in Figure 5 As shown, the angle of the protective cover when closed can be limited to 0°; after the protective cover is opened and rotated 90°, the curved plate 1-3 and the observation window 4 abut against each other, playing a limiting role; in this way, the protective cover can hover at any angle between 0° and 90° to meet the different needs of users.

[0059] In some embodiments, such as Figure 4 As shown in FIG. 1 , the tops of the two opposite sides of the housing 3 are respectively provided with second limiting grooves 3-1, and a through hole 3-2 is provided in the second limiting groove 3-1. The damping shaft 2-3 of the damping rotation structure 2 passes through the through hole 3-2. The second connecting piece 2-2 of the damping rotation structure 2 is embedded in the second limiting groove 3-1 and connected to the second limiting groove 3-1 by bolts.

[0060] If Figure 4 As shown in FIG. 1 , a second limiting groove 3-1 is provided on the top of the side of the housing 3, a through hole 3-2 is provided in the second limiting groove 3-1, the damping shaft 2-3 passes through the through hole 3-2, the second connecting piece 2-2 is embedded in the second limiting groove 3-1, and is connected to the second limiting groove 3-1 by bolts, so as to realize the rotation connection and reduce the occupied space.

[0061] In some embodiments, such as Figure 4 As shown in FIG. 1 , the tops of the two opposite sides of the housing 3 are respectively provided with third limiting grooves 3-3, the third limiting grooves 3-3 are provided with the second limiting grooves 3-1, and the fog screen further includes a cover plate 5, which is embedded in the third limiting grooves 3-3.

[0062] If Figure 4 As shown in FIG. 1 , a third limiting groove 3-3 is provided on the top of the side of the housing 3, a second limiting groove 3-1 is provided inside the third limiting groove 3-3, and the cover plate 5 is embedded in the third limiting groove 3-3 to play a shielding role.

[0063] ​​​​​​​​​​In some embodiments, such as Figure 4 shown, a sector-shaped protrusion is provided on the vertical plate 1-2, and an arc-shaped groove matching therewith is provided on the inner side of the housing 3, which can play a limiting role and ensure the stability when the protective cover rotates.

[0064] In some embodiments, such as Figure 4 shown, the vertical plate 1-2 is arranged inside the housing 3, which can protect the vertical plate 1-2 from being bumped and has a beautiful appearance.

[0065] In some embodiments, a support is connected to the bottom of the housing 3.

[0066] The support can be fixedly connected to the housing 3 or can be hinged to change the angle of the housing 3 for the convenience of users.

[0067] In some embodiments, such as Figure 4 shown, a connection port is provided on the side wall of the housing 3, and the connection port is used to connect external devices.

[0068] The connection port includes, for example, a headphone jack, a USB interface, an HDMI interface, a power interface, etc. The external devices include, for example, headphones, mobile phones, computers, iPads, TVs, or power supplies, etc., and are not specifically limited.

[0069] Those of ordinary skill in the art should understand that the discussion of any above embodiment is only exemplary and is not intended to imply that the scope of the present application (including the claims) is limited to these examples; under the idea of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the embodiments of the present application as described above, and they are not provided in detail for the sake of brevity.

[0070] In the embodiments of the present application, triangles, rectangles, trapezoids, pentagons, or hexagons, etc. are not strictly defined and can be approximate triangles, rectangles, trapezoids, pentagons, or hexagons, etc. There can be some small deformations caused by tolerances, and there can be chamfers, arc edges, and deformations, etc.

[0071] In the embodiments of the present application, "parallel" means a state where the angle formed by two straight lines is more than -10° and less than 10°, and therefore, it also includes a state where the angle is more than -5° and less than 5°. In addition, "perpendicular" means a state where the angle formed by two straight lines is more than 80° and less than 100°, and therefore, it also includes an angle state of more than 85° and less than 95°.

[0072] In the embodiments of the present application, "electrically connected" includes the case where components are connected together through an element having a certain electrical effect. The "element having a certain electrical effect" is not particularly limited as long as it can transfer electrical signals between the components to be connected. Examples of the "element having a certain electrical effect" include not only electrodes and wirings, but also switching elements such as transistors, resistors, inductors, capacitors, and other elements having various functions, etc.

[0073] In the embodiments of the present application, "film" and "layer" can be interchanged. For example, sometimes the "conductive layer" can be changed to the "conductive film". Similarly, sometimes the "insulating film" can be changed to the "insulating layer". The drawing ratios in the embodiments of the present application can be used as a reference in actual processes, but are not limited thereto. For example: the aspect ratio of the channel, the thickness and spacing of each film layer, can be adjusted according to actual needs. The number of pixels in the display panel and the number of sub-pixels in each pixel are not limited to the numbers shown in the figures. The drawings described in the embodiments of the present application are only schematic diagrams of the structure, and one embodiment of the present application is not limited to the shapes or values shown in the drawings, etc.

[0074] In addition, in the case where details are set forth to describe exemplary embodiments of the present application, it will be apparent to those skilled in the art that the present application embodiments can be implemented without these details or with variations of these details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0075] In addition, for simplicity of explanation and discussion, and in order not to make the embodiments of the present application difficult to understand, the known power / ground connections to other components may or may not be shown in the provided drawings. In addition, the device may be shown in the form of a block diagram in order not to make the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform on which the embodiments of the present application are to be implemented (i.e., these details should be fully within the understanding of those skilled in the art). In the case where specific details are set forth to describe exemplary embodiments of the present application, it will be apparent to those skilled in the art that the present application embodiments can be implemented without these specific details or with variations of these specific details. Therefore, these descriptions should be considered illustrative rather than restrictive.

Claims

1. A protective cover, characterized in that: Applied to fog screen, including: Cover body; A damping rotation structure, one end of which is connected to the cover body, and the other end of which is used to connect to the shell of the fog screen, so that the cover body is rotationally connected to the shell and has a hovering state; Wherein, the cover body includes a horizontal plate, and the opposite sides of the horizontal plate are respectively connected to longitudinal plates, and the bottom of each longitudinal plate is connected to a damping rotation structure; the damping rotation structure includes: a first connecting plate, connected to the longitudinal plate; a second connecting plate, used to connect the shell; a damping shaft, one end of which is connected to the first connecting plate, and the other end is connected to the second connecting plate.

2. The protective cover according to claim 1, characterized in that: A curved plate is connected to one side of the transverse plate, and the curved plate is perpendicular to the longitudinal plate.

3. The protective cover according to claim 2, characterized in that: A plurality of first reinforcing ribs are arranged at intervals on the inner side of the curved plate, and a plurality of second reinforcing ribs are arranged at intervals on the inner side of the longitudinal plate.

4. The protective cover according to claim 2, characterized in that: A hand grip groove is provided on the other side of the horizontal plate, and a magnetic attraction sheet is provided on the inner side of the horizontal plate. The magnetic attraction sheet is arranged close to the hand grip groove for connecting an external device.

5. The protective cover according to claim 1, characterized in that: A first limiting groove is provided at the bottom of the longitudinal plate, and the first connecting piece is embedded in the first limiting groove and connected to the first limiting groove by bolts.

6. The protective cover according to claim 1, characterized in that: The shape of the longitudinal plate is triangular, the shape of the first connecting plate is circular, the second connecting plate includes a plurality of connecting claws arranged in a circumferential array, the first connecting plate is provided with a first connecting hole, the connecting claw is provided with a second connecting hole, and the first connecting hole and the second connecting hole are staggered.

7. A fog screen, characterized in that: It comprises a shell, an observation window is arranged inside the shell, and the top of the shell is rotatably connected to the protective cover as claimed in any one of claims 1 to 6 so that the protective cover covers the observation window.

8. The fog screen according to claim 7, characterized in that: The top of the shell is arc-shaped and matches with the curved plate of the protective cover.

9. The fog screen according to claim 7, characterized in that: The tops of the two opposite sides of the shell are respectively provided with second limiting grooves, and a through hole is provided in the second limiting groove. The damping shaft of the damping rotation structure passes through the through hole, and the second connecting piece of the damping rotation structure is embedded in the second limiting groove and connected to the second limiting groove by bolts.

10. The fog screen according to claim 9, characterized in that: The tops of the two opposite sides of the shell are respectively provided with third limiting grooves, the second limiting grooves are provided in the third limiting grooves, and the fog screen also includes a cover plate, which is embedded in the third limiting grooves.

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