An infrared visual camera for assisting in forest positioning

Abstract

This utility model relates to the field of infrared visual camera technology, and more particularly to an infrared visual camera for assisting forest positioning. An infrared visual camera for assisting forest positioning includes a battery compartment with a single-sided opening for receiving the battery, and a flip control plate that is rotatably fastened to the battery compartment. The flip control plate includes a front panel disposed on the front side and a rear panel disposed on the rear side. When the flip control plate is fastened to the battery compartment by a snap-fit ​​assembly, the rear panel faces the receiving cavity, and the front panel faces the front side. A main antenna and a diversity antenna extend from the top of the flip control plate. This utility model adds external main and diversity antennas, which, in conjunction with the positioning module inside the flip control plate, can effectively enhance the signal coverage and transmission rate, assisting the infrared visual camera's positioning capability in the forest. The flip control plate and the battery compartment are fastened together by a snap-fit ​​assembly, enabling the flip control plate to be repeatedly opened and closed.

Description

Technical Field

[0001] This utility model relates to the field of infrared visual camera technology, and in particular to an infrared visual camera for assisting forest positioning. Background Technology

[0002] An existing infrared visual camera, typically installed in the wild or forest, observes wildlife images and performs monitoring functions using infrared light. A common structure of this infrared visual camera includes a battery compartment and a flip-up control panel. This control panel is bidirectional; the outer panel houses infrared sensor arrays, a camera, and sensing areas, used to sense objects in real time and display the infrared images on the user's screen via remote communication. The rear panel is hidden inside the battery compartment when not in use by flipping and locking. When adjustments or setups are needed, the rear panel can be opened for these adjustments.

[0003] Infrared visual cameras also have a built-in positioning module. While viewing the monitoring images on the main device, users can use the positioning module to locate the current position of the infrared visual camera and determine the animal's activity range and path. However, due to the dense trees in the forest, the interference with wireless communication is strong, which weakens the positioning ability of the positioning module conventionally built into the control panel, resulting in inaccurate positioning. Utility Model Content

[0004] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the description and other accompanying drawings.

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings and provide an infrared visual camera for forest positioning. It adds an external main antenna and diversity antenna, which, together with the positioning module in the flip control board, can effectively enhance the signal coverage and transmission rate, thus assisting the infrared visual camera in positioning in the forest. The flip control board and the battery compartment are connected by a snap-fit ​​assembly, which enables the flip control board to be repeatedly opened and closed. The buckle set in the snap-fit ​​assembly can improve the tightness of the closure and prevent the snap-fit ​​assembly from being accidentally dropped and opened.

[0006] This utility model provides an infrared visual camera for assisting forest positioning, including a battery compartment with a single-sided opening cavity and a flip control plate that is rotatably fastened to the battery compartment; the flip control plate includes a front panel disposed on the front side and a rear panel disposed on the rear side. When the flip control plate is fastened to the battery compartment by a snap fastener assembly, the rear panel faces the cavity and the front panel faces the front side. The top of the flip control plate also extends to provide a main antenna and a diversity antenna.

[0007] In its normal state, the flip control panel and battery compartment are locked together. The user fixes the infrared camera to a tree or other fixed device with the front panel facing forward to monitor and display moving objects in a certain area in front. When adjustments are needed, the snap-fit ​​components are opened one by one, disengaging the flip control panel and battery compartment, revealing the rear panel for adjustment. The single-sided opening cavity is used to fill the power supply battery, providing continuous power to the flip control panel. When the battery needs to be replaced, it can also be replaced by opening the snap-fit ​​components. The control components required for animal monitoring and infrared imaging are all built into the flip control panel. The flip control panel also has a built-in positioning module. The main antenna and diversity antenna extending from the top of the flip control panel are electrically connected to the positioning module. The external main antenna and diversity antenna can effectively enhance the signal coverage and transmission rate, improve the stability and anti-interference of wireless communication, and assist the infrared camera's positioning ability in the forest. Preferably, the positioning module is a GNSS module.

[0008] In some embodiments, a plurality of pivot bases are provided on one side of the battery compartment, and a rotating hole is provided correspondingly on the side of the flip control plate. A rotating shaft is fitted between the rotating hole and the pivot base to achieve a rotatable connection. A plurality of buckle assemblies are spaced apart on the other side of the battery compartment. The fit between the pivot base, the rotating hole, and the rotating shaft enables a rotatable connection between the battery compartment and the flip control plate. Preferably, the edges of the pivot base and the rotating hole are inclined so that the battery compartment and the flip control plate can be opened at a fixed angle by contact.

[0009] In some embodiments, the snap-fit ​​assembly includes a rotating buckle, a buckle ring, and a snap-fit ​​seat. Several rotating buckles are rotatably disposed on the side of the battery compartment, and the buckle ring is rotatably connected to each rotating buckle. Several snap-fit ​​seats extend correspondingly from the side of the flip control panel, and each snap-fit ​​seat has a snap-fit ​​groove. One side of the buckle ring is rotatably connected to the rotating buckle, and the other side of the buckle ring is engaged in the snap-fit ​​groove. The snap-fit ​​assembly enables the flip control panel to be repeatedly opened and closed. In actual use, after the user snaps the flip control panel into the battery compartment, the buckle ring on the rotating buckle is engaged in the snap-fit ​​groove on the snap-fit ​​seat, and then the rotating buckle is rotated to close, thus completing the installation. The buckle ring within the snap-fit ​​assembly improves the tightness of the closure and prevents the snap-fit ​​assembly from accidentally falling and opening. The specific structures of the rotating buckle, buckle ring, and snap-fit ​​seat are not specifically limited here; reference to existing technologies is sufficient.

[0010] In some embodiments, the front panel includes an infrared sensor array, a camera, a sensing area, and a broadcasting area. The infrared sensor array is located at the top of the front panel, the broadcasting area is located at the bottom of the front panel, the camera is located below the infrared sensor array, and the sensing area is located above the broadcasting area. The set-up sensing area is used to detect moving objects in front. When a moving object is detected entering the field of view, infrared imaging is automatically activated. The infrared sensing light group is used to emit infrared light and convert it into electrical signals to present a black and white image. The advantage of infrared imaging is that it can accurately detect images at night. The set-up camera is used to present images during the day and assist in imaging at night. The broadcast area is used to collect the sound of moving objects. The intelligent control components required to realize the above functions are all integrated inside the flip control board. Existing infrared visual cameras all include the above components. This technical solution has been widely used in the field. This application focuses on the structural improvement of infrared visual cameras. The internal components and control programs will not be described in detail here. Refer to the existing technology. It can be understood that the flip control board is equipped with a remote communication module and a positioning module. The positioning module works with the antenna to achieve the function of accurate positioning. The remote communication module sends the infrared image and the detected positioning information to the user's screen.

[0011] In some embodiments, a locking hole extends from the side of the front panel, the rear side of which abuts against the battery compartment. The locking hole is located between the snap-fit ​​components, and a charging port is also provided on the bottom side of the front panel. The side-extending locking hole acts as a fulcrum. When the rear panel is snapped into the battery compartment, the user can lift the flip control panel through the locking hole. The charging port is electrically connected to the battery compartment through the flip control panel to charge and discharge the battery.

[0012] In some embodiments, the rear panel includes a display screen and a control button group, with the display screen located above the control button group. When it is necessary to perform some equipment debugging or setting adjustments on the infrared visual camera, setting options are displayed on the display screen, and the device can be adjusted and modified through the control button group. The above technical solution has been presented in the prior art, and the specific implementation principle can be referred to the prior art.

[0013] In some embodiments, the rear panel edge is recessed inward to form a groove, through which the rear panel is fastened into the receiving cavity. The recessed groove allows the rear panel to be fastened into the battery compartment for concealment, reducing the overall thickness of the device and protecting the rear panel.

[0014] In some embodiments, a hanging ring is rotatably connected to the top of the rear panel, located above the display screen. A SIM card slot and an SD card slot are also provided on the side of the rear panel. The hanging ring allows the rear panel to be fixed to a tree even when unfolded. The SIM card slot and SD card slot are used to insert SIM cards and SD cards, enabling the storage of user information and short-term communication information.

[0015] In some embodiments, a battery base is provided within the receiving cavity, and several batteries are sequentially installed within the battery base. The battery base is electrically connected to the flip control board. The battery base is electrically connected to the flip control board to provide continuous power to the flip control board. The batteries and the battery base are detachable. The specific structure of the battery base can be found in the prior art and will not be elaborated here.

[0016] In some embodiments, a fixing ring is also provided on the back side of the battery compartment. The fixing ring is an arc shape that bulges backward, and several reinforcing ridges are spaced apart inside the fixing ring. The fixing ring is used to wrap rope or wire around it and bind it to the tree, thereby fixing the position of the infrared camera. The reinforcing ridges inside the fixing ring can enhance the support capacity of the fixing ring, and the gaps between the reinforcing ridges can also help to fix the rope, improving the stability of the binding.

[0017] By adopting the above technical solution, the beneficial effects of this utility model are:

[0018] This utility model adds an external main antenna and diversity antenna, which, together with the positioning module inside the flip control board, can effectively enhance the signal coverage and transmission rate, and assist the infrared visual camera in positioning in the forest. The flip control board and the battery compartment are connected by a snap-fit ​​assembly, which enables the flip control board to be repeatedly opened and closed. The buckle set in the snap-fit ​​assembly can improve the tightness of the closure and prevent the snap-fit ​​assembly from being accidentally dropped and opened.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.

[0020] Undoubtedly, such and other objects of this invention will become more apparent after the following detailed description of the preferred embodiments, which are illustrated in various accompanying drawings and illustrations.

[0021] To make the above and other objects, features and advantages of this utility model more apparent and understandable, one or more preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0023] In the accompanying drawings, the same parts use the same reference numerals, and the drawings are schematic and not necessarily drawn to actual scale.

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one or more embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on such drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of the infrared visual camera in some embodiments of this utility model;

[0026] Figure 2 This is a schematic diagram of the specific structure of the rear panel in some embodiments of the present utility model;

[0027] Figure 3 This is a schematic diagram showing the rotating connection between the battery compartment and the flip control board in some embodiments of this utility model;

[0028] Figure 4 This is a schematic diagram showing the positional relationship between the rear panel and the battery in some embodiments of this utility model.

[0029] Explanation of key figure labels:

[0030] 1. Battery compartment;

[0031] 11. Battery holder; 12. Battery; 13. Fixing ring;

[0032] 2. Flip control panel;

[0033] 21. Front panel;

[0034] 211. Infrared sensor light cluster; 212. Camera; 213. Sensing area; 214. Announcement area; 215. Keyhole;

[0035] 22. Rear panel;

[0036] 221. Display screen; 222. Control button group; 223. Recess; 224. Hanging ring;

[0037] 23. Main antenna;

[0038] 24. Diversity antenna;

[0039] 3. Press-fit assembly;

[0040] 31. Rotating buckle; 32. Buckle ring; 33. Buckle seat. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0042] Furthermore, it should be understood in the description of this utility model that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected through a transitional structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0044] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] Reference Figure 1 , Figure 1 This is a schematic diagram of the overall structure of the infrared visual camera in some embodiments of this utility model.

[0046] According to some embodiments of the present invention, the present invention provides an infrared visual camera for assisting forest positioning, including a battery compartment 1 with a single-sided opening receiving cavity and a flip control plate 2 that is rotatably fastened to the battery compartment 1; the flip control plate 2 includes a front panel 21 disposed on the front side and a rear panel 22 disposed on the rear side. When the flip control plate 2 is fastened to the battery compartment 1 by a snap fastener assembly 3, the rear panel 22 faces the receiving cavity and the front panel 21 faces the front side. The top of the flip control plate 2 is also provided with a main antenna 23 and a diversity antenna 24.

[0047] In its normal state, the flip control panel 2 and battery compartment 1 are locked together. The user secures the infrared camera to a tree or other fixed device, with the front panel 21 facing forward, to monitor and display moving objects within a certain area. When adjustments are needed, the snap-fit ​​components 3 are opened one by one, disengaging the flip control panel 2 and battery compartment 1. The rear panel 22 is then exposed for adjustments. The single-sided opening cavity is used to hold the power supply battery 12, providing continuous power to the flip control panel 2. When the battery 12 needs to be replaced, it can also be used for other functions. Battery 12 can be replaced by opening snap fastener assembly 3. The control components required for animal monitoring and infrared imaging are all built into the flip control board 2. The flip control board 2 also has a built-in positioning module. The main antenna 23 and diversity antenna 24 extended from the top of the flip control board 2 are electrically connected to the positioning module. The external main antenna 23 and diversity antenna 24 can effectively enhance the signal coverage and transmission rate, improve the stability and anti-interference of wireless communication, and assist the infrared visual camera in positioning in the forest. Preferably, the positioning module is a GNSS module.

[0048] The front panel 21 includes an infrared sensor light cluster 211, a camera 212, a sensing area 213, and a broadcasting area 214. The infrared sensor light cluster 211 is located at the top of the front panel 21, the broadcasting area 214 is located at the bottom of the front panel 21, the camera 212 is located below the infrared sensor light cluster 211, and the sensing area 213 is located above the broadcasting area 214. The sensing area 213 is used to sense moving objects in front. When a moving object is detected entering the field of view, infrared imaging is automatically activated. The infrared sensing light group 211 is used to emit infrared light and convert it into an electrical signal to present a black and white image. The advantage of infrared imaging is that it can accurately detect images at night. The camera 212 is used to present images during the day and assist in night imaging. The audio area 214 is used to collect the sound of moving objects. The intelligent control components required to realize the above functions are all integrated inside the flip control board 2. The above components are included in the existing infrared visual cameras. This technical solution has been widely used in the field. This application focuses on the structural improvement of the infrared visual camera. The internal components and control program will not be described in detail here. Refer to the existing technology. It can be understood that the flip control board 2 is equipped with a remote communication module and a positioning module. The positioning module works with the antenna to realize the function of accurate positioning. The remote communication module sends the infrared image and the detected positioning information to the user's screen.

[0049] Reference Figure 2 , Figure 2 This is a schematic diagram of the specific structure of the rear panel in some embodiments of the present invention.

[0050] Optionally, according to some embodiments of this utility model, a locking hole 215 extends from the side of the front panel 21, the rear side of which abuts against the battery compartment 1. The locking hole 215 is located between the snap-fit ​​components 3, and a charging hole is also provided on the bottom side of the front panel 21. The side-extending locking hole 215 acts as a fulcrum. When the rear panel 22 is snapped into the battery compartment 1, the user can lift the flip control plate 2 through the locking hole 215. The charging hole is electrically connected to the battery compartment 1 through the flip control plate 2 to charge and discharge the battery 12.

[0051] The rear panel 22 includes a display screen 221 and a control button group 222, with the display screen 221 located above the control button group 222. When it is necessary to perform some equipment debugging or setting adjustments on the infrared visual camera, setting options are displayed on the display screen 221, and the device can be adjusted and modified through the control button group 222. The above technical solution has been presented in the prior art, and the specific implementation principle can be referred to the prior art.

[0052] The rear panel 22 has an inwardly recessed edge forming a groove 223, through which the rear panel 22 is fastened into the receiving cavity. The inwardly recessed groove 223 allows the rear panel 22 to be fastened into the battery compartment 1 for concealment, reducing the overall thickness of the device and protecting the rear panel 22.

[0053] The rear panel 22 is rotatably connected to a hanging ring 224 at its top, which is located above the display screen 221. A SIM card slot and an SD card slot are also provided on the side of the rear panel 22. The hanging ring 224 allows the rear panel 22 to be fixed to a tree even when unfolded. The SIM card slot and SD card slot are used to insert SIM cards and SD cards, enabling the storage of user information and short-term communication information.

[0054] Reference Figure 3 , Figure 3 This is a schematic diagram showing the rotating connection between the battery compartment and the flip control board in some embodiments of this utility model.

[0055] According to some embodiments of this utility model, optionally, a plurality of pivot bases are provided on one side of the battery compartment 1, and a rotating hole is provided correspondingly on the side of the flip control plate 2. The rotating hole and the pivot base are fitted with a rotating shaft to achieve a rotatable connection. A plurality of buckle assemblies 3 are spaced apart on the other side of the battery compartment 1. The fit between the pivot base, the rotating hole and the rotating shaft achieves a rotatable connection between the battery compartment 1 and the flip control plate 2. Preferably, the edges of the pivot base and the rotating hole are inclined so that the battery compartment 1 and the flip control plate 2 can be opened at a fixed angle by contact.

[0056] The battery compartment 1 also has a fixing ring 13 on its back side. The fixing ring 13 is an arc shape that bulges backward, and several reinforcing ridges are arranged at intervals inside the fixing ring 13. The fixing ring 13 is used to wrap rope or wire and bind it to the tree, thereby fixing the position of the infrared camera. The reinforcing ridges inside the fixing ring 13 can enhance the support capacity of the fixing ring 13, and the increased gaps between the ridges can also help to fix the rope and improve the stability of the binding.

[0057] Reference Figure 4 , Figure 4 This is a schematic diagram showing the positional relationship between the rear panel and the battery in some embodiments of this utility model.

[0058] According to some embodiments of the present invention, optionally, the snap fastening assembly 3 includes a rotating buckle 31, a buckle ring 32, and a fastening seat 33. Several rotating buckles 31 are rotatably arranged on the side of the battery compartment 1, and the buckle ring 32 is rotatably connected to the rotating buckle 31. Several fastening seats 33 are correspondingly extended on the side of the flip control plate 2. The fastening seat 33 is provided with a fastening groove. One side of the buckle ring 32 is rotatably connected to the rotating buckle 31, and the other side of the buckle ring 32 is engaged in the fastening groove. The flip control panel 2 can be repeatedly opened and closed by means of a fastening assembly. In actual use, after the user fastens the flip control panel 2 into the battery compartment 1, the user inserts the buckle 32 on the rotating buckle 31 into the fastening groove on the fastening seat 33, and then rotates the rotating buckle 31 to close it to complete the installation. The buckle 32 provided in the buckling assembly 3 can improve the tightness of the closure and prevent the buckling assembly 3 from accidentally falling and opening. The specific structure of the rotating buckle 31, the buckle 32 and the fastening seat 33 is not specifically limited here, and can be referred to the existing technology.

[0059] The cavity contains a battery base 11, within which several batteries 12 are sequentially installed. The battery base 11 is electrically connected to the flip control board 2. The battery base 11, electrically connected to the flip control board 2, provides continuous power to the flip control board 2. The batteries 12 are detachable from the battery base 11. The specific structure of the battery base 11 can be found in existing technology and will not be elaborated upon here.

[0060] It should be understood that the embodiments disclosed herein are not limited to the specific processing steps or materials disclosed herein, but should be extended to equivalent substitutions of such features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0061] The term "embodiment" in this specification refers to a specific feature or characteristic described in connection with an embodiment that is included in at least one embodiment of the present invention. Therefore, phrases or "embodiments" appearing in various places throughout the specification do not necessarily refer to the same embodiment.

[0062] Furthermore, the described features or characteristics may be incorporated into one or more embodiments in any other suitable manner. In the above description, specific details, such as thickness, quantity, etc., are provided to provide a comprehensive understanding of embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented without the aforementioned one or more specific details or may be implemented using other methods, components, materials, etc.

Claims

1. An infrared visual camera for assisting forest positioning, characterized in that, include The battery compartment has a receiving cavity with an opening on one side. The flip control panel rotates and engages with the battery compartment. The flip control panel includes a front panel disposed on the front side and a rear panel disposed on the rear side. When the flip control panel is fastened to the battery compartment by a snap fastener assembly, the rear panel faces the receiving cavity and the front panel faces the front side. The top of the flip control panel is also provided with a main antenna and a diversity antenna.

2. The infrared visual camera to assist in locating a forest fire according to claim 1, wherein, The battery compartment has several pivot bases on one side, and the flip control panel has a corresponding rotating hole extending from the side. The rotating hole and the pivot base are connected by a rotating shaft to achieve a rotatable connection. The other side of the battery compartment has several buckle assemblies spaced apart.

3. The infrared visual camera to assist in locating a forest fire according to claim 2, wherein, The snap fastening assembly includes a rotating buckle, a buckle ring, and a fastening seat. Several rotating buckles are rotatably arranged on the side of the battery compartment, and the buckle ring is rotatably connected to the rotating buckle. Several fastening seats are correspondingly extended on the side of the flip control plate, and the fastening seat is provided with a fastening groove. One side of the buckle ring is rotatably connected to the rotating buckle, and the other side of the buckle ring is locked in the fastening groove.

4. The infrared visual camera to assist in locating a forest fire according to claim 1, wherein, The front panel includes an infrared sensor array, a camera, a sensing area, and a broadcasting area. The infrared sensor array is located at the top of the front panel, the broadcasting area is located at the bottom of the front panel, the camera is located below the infrared sensor array, and the sensing area is located above the broadcasting area.

5. The infrared visual camera to aid in locating a forest fire according to claim 1, wherein, The front panel has a lock hole extending from the side, which abuts against the battery compartment. The lock hole is located between the snap fasteners. The bottom side of the front panel also has a charging hole.

6. The infrared visual camera to aid in locating a forest fire according to claim 1, wherein, The rear panel includes a display screen and a group of control buttons, with the display screen positioned above the group of control buttons.

7. The infrared visual camera to aid in locating a forest fire according to claim 1, wherein, The rear panel has an inwardly recessed edge forming a groove, through which the rear panel is fastened into the receiving cavity.

8. The infrared visual camera to assist in locating a forest fire according to claim 6, wherein, The top of the rear panel is rotatably connected to a hanging ring, which is located above the display screen. The side of the rear panel also has a SIM card slot and an SD card slot.

9. The infrared visual camera to assist in locating a forest fire according to claim 1, wherein, The cavity contains a battery base, in which several batteries are sequentially installed. The battery base is electrically connected to the flip control board.

10. The infrared visual camera to assist in locating a forest fire according to claim 1, wherein, The battery compartment also has a fixing ring on the back side. The fixing ring is an arc shape that bulges backward, and several reinforcing ridges are arranged at intervals inside the fixing ring.

Images