An optical blackboard

Abstract

The utility model provides a kind of optical blackboard, it is related to educational apparatus technical field, first assembly shell and second assembly shell will control circuit board, first camera and second camera are installed on the side wall of blackboard main body, avoid chalk dust or be affected by gravity along blackboard main body to flow to the bottom of the influence of water flow, increase the life of electronic component, assembly component includes first assembly shell, second assembly shell connected by detachable connecting assembly, specifically can adopt modular design to realize the quick disassembly of top and bottom shell, dust or internal element is repaired, while reducing the damage of component caused by water flow.The positioning slide rail is arranged on the two side walls of the accommodating groove, ensuring the stable operation of the circuit board in a dusty environment, and facilitating disassembly and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of educational equipment technology, and in particular to an optical blackboard. Background Technology

[0002] The smart blackboard is an innovative intelligent teaching device that combines the traditional blackboard with modern multimedia technology. Utilizing advanced capacitive touch technology, it makes teaching more flexible and interactive. It can freely switch between chalk writing and multimedia applications, offering the dual functionality of a traditional blackboard and a modern touchscreen. On this device, teachers can not only use chalk for traditional writing and explanations, but also easily access multimedia resources such as videos, images, and animations through touch operation, injecting more interactivity and fun into the classroom.

[0003] Existing smart blackboards can display the written content on a display device by analyzing the trajectory of writing actions captured by a camera and then controlling the circuit board. However, existing smart blackboards usually install the camera component at the bottom of the blackboard body. When using and maintaining a smart blackboard, the camera and electronic components are prone to accumulating dust, chalk dust, or being affected by water flowing down the blackboard body to the bottom due to gravity. Utility Model Content

[0004] The purpose of this invention is to address the deficiencies and shortcomings of the existing technology by providing an optical blackboard that solves at least one of the aforementioned technical problems and has the benefit of reducing the impact of chalk dust and water flow.

[0005] To achieve the above objectives, this utility model provides an optical blackboard, comprising:

[0006] A camera assembly, the camera assembly including a first camera and a second camera;

[0007] An assembly assembly includes a first assembly housing, a second assembly housing detachably connected to the top and bottom of the first assembly housing via a detachable connecting assembly, an upper mounting end disposed at the top of the second assembly housing and a lower mounting end disposed at the bottom of the second assembly housing, wherein the first camera and the second camera are respectively mounted on the upper mounting end and the lower mounting end;

[0008] A blackboard includes two blackboard bodies, a display device is disposed between the two blackboard bodies, and a first assembly housing and a second assembly housing are disposed on the side of the two blackboard bodies away from the display device. A receiving groove is provided in the first assembly housing, and positioning slide rails for mounting and positioning control circuit boards are provided on the opposite side walls of the receiving groove.

[0009] An assembly connector is provided on the side of the second assembly housing away from the first assembly housing. The assembly connector is used to detachably connect the blackboard body to the second assembly housing. An illumination component is provided on the control circuit board for supplementing light to the camera assembly.

[0010] Optionally, the first assembly housing includes a first assembly plate and a second assembly plate disposed opposite to each other. The first assembly plate and the second assembly plate are connected by a connecting plate. A first guide groove is provided on one side of the first assembly plate, and a second guide groove is provided on the side of the second assembly plate close to the first assembly plate. The first guide groove cooperates with the second guide groove to form the positioning slide rail.

[0011] Optionally, the second assembly housing has two parts, which are respectively disposed at the top and bottom of the first assembly housing. The mounting end includes a first mounting part and a second mounting part. A first inclined plate is provided on one side of the first mounting part, and a first engaging groove is provided on the first inclined plate. A second inclined plate is provided on the side of the second mounting part near the first mounting part, which is directly opposite the first inclined plate. A second engaging groove is provided on the second inclined plate that is adapted to the first engaging groove.

[0012] Optionally, the detachable connection assembly includes a threaded post for insertion on the second assembly housing, a first connection through hole on the control circuit board, and a second connection through hole on the first assembly housing. The threaded post for insertion passes through the first connection through hole, and a bolt passes through the second connection through hole. The first assembly housing of the control circuit board and the assembly plate assembly can be connected by the bolt threadedly engaging with the threaded post for insertion.

[0013] Optionally, the second inclined plate is provided with a locking limiting plate that cooperates with the first locking groove and the second locking groove to lock the camera assembly.

[0014] Optionally, the assembly connector includes a connecting locking plate disposed on one side of the second assembly housing, the connecting locking plate being provided with a third connecting through hole penetrating its opposite sides and an oval hole penetrating its opposite sides.

[0015] Optionally, an L-shaped snap-fit ​​plate is provided on the side of the first assembly plate near the second assembly plate, and the L-shaped snap-fit ​​plate and one side of the first assembly plate form a snap-fit ​​groove.

[0016] Optionally, a clearance is provided between the L-shaped snap-fit ​​plate and the second mounting plate to avoid obstructing the lighting components.

[0017] Optionally, the first mounting shell and the second mounting shell are disposed on the left and / or right side of the blackboard body, and the first camera and the second camera are tilted toward the center of the blackboard body.

[0018] Optionally, one end of the first inclined plate and the second inclined plate are both arc-shaped and combined to form a U-shape. The arc-shaped ends of the first inclined plate and the second inclined plate are provided with a partition opening, and the other ends of the first inclined plate and the second inclined plate are blocked by the first assembly housing.

[0019] Compared with the prior art, the advantages of this application are:

[0020] This invention mounts the control circuit board, first camera, and second camera onto the side wall of the blackboard body using a first and second assembly housing. This avoids the impact of chalk dust or water flowing down the blackboard body to the bottom due to gravity, increasing the lifespan of electronic components. The assembly assembly includes a first assembly housing and a second assembly housing connected by a detachable connecting component. Specifically, a modular design allows for quick assembly and disassembly of the top and bottom housings, facilitating dust cleaning or internal component repair while reducing component damage caused by water flow. Positioning slide rails are installed on both sides of the receiving groove to ensure stable operation of the circuit board in a dusty environment and facilitate disassembly and maintenance. Attached Figure Description

[0021] 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 This is an isometric schematic diagram of an embodiment of the present invention;

[0023] Figure 2 This is a side view of an embodiment of the present invention;

[0024] Figure 3 As described in the embodiments of the present invention Figure 2 Enlarged schematic diagram of part a;

[0025] Figure 4 This is an exploded view diagram of an embodiment of the present invention;

[0026] Figure 5 As described in the embodiments of the present invention Figure 4 Enlarged diagram of part b;

[0027] Figure 6 As described in the embodiments of the present invention Figure 4Enlarged diagram of part c;

[0028] Figure 7 This is an isometric view of the shell being removed in an embodiment of the present invention;

[0029] Figure 8 As described in the embodiments of the present invention Figure 7 Enlarged schematic diagram of part d;

[0030] Figure 9 This is an isometric schematic diagram of the blackboard mounting component in an embodiment of the present invention;

[0031] Figure 10 This is an isometric view of the second assembly housing in an embodiment of the present invention;

[0032] Figure 11 This is a top view of the second assembly housing in an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 100. Camera assembly; 101. First camera; 102. Second camera; 103. Mounting plate; 104. Camera body; 105. Threaded seat; 106. External thread;

[0035] 200. Assembly component; 201. First assembly housing; 202. Second assembly housing; 203. Upper mounting end; 204. Lower mounting end; 205. Receiving groove; 206. Positioning slide rail; 207. First assembly plate; 208. Second assembly plate; 209. Connecting plate; 210. First guide groove; 211. Second guide wire groove; 212. First mounting part; 213. Second mounting part; 214. First inclined plate; 215. First engaging groove; 216. Second inclined plate; 217. Second engaging groove; 218. Engagement limiting plate; 219. L-shaped engagement plate; 220. Engagement groove; 221. Clearance gap;

[0036] 300. Detachable connecting assembly; 301. Insert-in internally threaded post; 302. First connecting through hole; 303. Second connecting through hole;

[0037] 400. Blackboard body;

[0038] 500. Blackboard mounting bracket; 501. First mounting vertical plate; 502. Mounting horizontal plate; 503. Mounting eaves; 504. Second mounting vertical plate; 505. Fourth connecting through hole; 506. Fifth connecting through hole; 507. Mounting bracket; 508. Sixth connecting through hole; 509. Seventh connecting through hole; 510. Eighth connecting through hole;

[0039] 600. Assembly connector; 604. Connecting locking plate; 602. Third connecting through hole; 603. Oval hole.

[0040] 700, Control circuit board; 800, Lighting assembly. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] It should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "back," "side," and "circumferential" used in this utility model to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. In addition, the terms "first" and "second" are only used to distinguish multiple parts or structures with the same or similar structures, and do not indicate any special limitation on the arrangement order or connection relationship.

[0043] Please refer to Figures 1 to 11This utility model provides an optical blackboard, including: a camera assembly 100, an assembly assembly, a blackboard, and an assembly connector. The camera assembly 100 includes a first camera 101 and a second camera 102. The assembly assembly includes a first assembly housing 201, a second assembly housing 202 detachably connected to the top and bottom of the first assembly housing 201 via a detachable connecting assembly, an upper mounting end 203 at the top of the second assembly housing 202, and a lower mounting end 204 at the bottom of the second assembly housing 202. The first camera 101 and the second camera 102 are respectively mounted on the upper mounting end 203 and the lower mounting end 204. The blackboard includes two blackboard bodies 400, with a display device (not shown in the figure) disposed between the two blackboard bodies 400. The first assembly housing 201 and the second assembly housing 202 are disposed on the side of the two blackboard bodies 400 away from the display device. A receiving groove 205 is formed in the first assembly housing 201, and the opposite side walls of the receiving groove 205... The control circuit board 700 is provided with a positioning slide rail 206 for mounting and positioning; an assembly connector is provided on the side of the second assembly housing 202 away from the first assembly housing 201, the assembly connector is used to detachably connect the blackboard body to the second assembly housing 202, and the control circuit board 700 is provided with an illumination component 800 for supplementing light to the camera component 100. Furthermore, this application uses the first assembly housing 201 and the second assembly housing 202 to mount the control circuit board 700, the first camera 101 and the second camera 102 on the side wall of the blackboard body 400, avoiding the influence of chalk dust or water flowing down the blackboard body 400 to the bottom due to gravity, and increasing the life of electronic components. The assembly component includes the first assembly housing 201 and the second assembly housing 202 connected by a detachable connection component. Specifically, a modular design can be adopted to realize the quick assembly and disassembly of the top and bottom housings, which is convenient for cleaning dust or repairing internal components. The positioning slide rail 206 is provided on both sides of the receiving groove 205 to ensure that the circuit board works stably in the dusty environment, and at the same time facilitates disassembly and maintenance. The lighting component 800 is mounted on the control circuit board 700. Specifically, it can use LED beads to provide uniform illumination for the camera and improve the camera's shooting accuracy.

[0044] The dual-camera configuration improves the field of view coverage. The control circuit board 700 uses a sliding rail for easy installation and replacement. The lighting assembly 800 ensures image quality under various lighting conditions. The overall design achieves protection for the camera assembly 100, ease of maintenance, and optimized image quality.

[0045] In this embodiment, the first assembly housing 201 includes a first assembly plate 207 and a second assembly plate 208 disposed opposite to each other. The first assembly plate 207 and the second assembly plate 208 are connected by a connecting plate 209. A first guide groove 210 is provided on one side of the first assembly plate 207, and a second guide groove 211 is provided on the side of the second assembly plate 208 near the first assembly plate 207. The first guide groove 210 and the second guide groove 211 cooperate to form the positioning slide rail 206. Furthermore, the first assembly plate 207 and the second assembly plate 208 form a rigid support frame through the connecting plate 209, and the symmetrical distribution of the first guide groove 210 and the second guide groove 211 constitutes a track structure. The connecting plate 209 is set as a laterally extending metal plate. The cross-section of the first guide groove 210 is a U-shaped concave structure, and the cross-section of the second guide groove 211 is an inverted U-shaped concave structure. In this embodiment, when the first assembly housing 201 and the second assembly housing 202 are connected, the second assembly housing 202 will block the positioning slide rail 206 to prevent the control circuit board 700 from detaching from the positioning slide rail 206.

[0046] In this embodiment, the second assembly housing 202 has two parts, respectively disposed at the top and bottom of the first assembly housing 201. The mounting ends include a first mounting portion 212 and a second mounting portion 213. A first inclined plate 214 is provided on one side of the first mounting portion 212, and a first engaging groove 215 is provided on the first inclined plate 214. A second inclined plate 216 is provided on the side of the second mounting portion 213 near the first mounting portion 212, facing the first inclined plate 214, and a second engaging groove 217 adapted to the first engaging groove 215 is provided on the second inclined plate 216. Furthermore, the first inclined plate 214 and the second inclined plate 216 form a symmetrical inclined surface structure. Specifically, when the camera assembly 100 is embedded in the mounting end, the first engaging groove 215 and the second engaging groove 217 generate a guiding effect through the inclined surface contact, and a mechanical interlock is formed by the mating structure of the first engaging groove 215 and the second engaging groove 217. The symmetrical arrangement of the inclined plates ensures that the force is evenly distributed on both sides, avoiding stress concentration on one side that could lead to structural deformation.

[0047] In this embodiment, the detachable connection assembly includes an internally threaded post 301 disposed on the second assembly housing 202, a first connecting through hole 302 disposed on the control circuit board 700, and a second connecting through hole 303 disposed on the first assembly housing 201. The internally threaded post 301 passes through the first connecting through hole 302, and a bolt passes through the second connecting through hole 303. The first assembly housing 201 of the control circuit board 700 can be connected to the assembly plate assembly by the threaded engagement of the bolt with the internally threaded post 301. Furthermore, the internally threaded post 301 and the second assembly housing 202 are manufactured using an integral molding process. The inner diameter of the first connecting through hole 302 and the outer diameter of the internally threaded post 301 form a clearance fit. The second connecting through hole 303 is disposed on the first assembly housing 201, and its axis coincides with the axis of the internally threaded post 301. The bolt adopts the M4 standard thread specification, and the thread length is not less than 1.2 times the height of the internally threaded post 301. After the control circuit board 700 is sleeved on the plug-in internal thread post 301 through the first connecting through hole 302, the second assembly housing 202 and the first assembly housing 201 are axially positioned.

[0048] Specifically, during disassembly, the bolts are unscrewed to release the threaded lock between the threaded post 301 and the second connecting through hole 303, thus locking the first assembly housing 201, the control circuit board 700, and the second assembly housing 202. During installation, the first connecting through hole 302 of the control circuit board 700 is aligned with the threaded post 301 and inserted. After the second assembly housing 202 contacts the first assembly housing 201, the bolts pass through the second connecting through hole 303 and are threadedly tightened to the threaded post 301.

[0049] In this embodiment, the second inclined plate 216 is provided with a locking limiting plate 218 that cooperates with the first locking groove 215 and the second locking groove 217 to lock the camera assembly 100. The first camera 101 and the second camera 102 both include a mounting plate 103 and a camera body 104 detachably connected to the mounting plate 103. The mounting plate 103 can be locked into the first locking groove 215 and the second locking groove 217. Further, a threaded seat 105 is provided on one side of the mounting plate 103, and an external thread 106 adapted to the threaded seat 105 is provided on the outer side wall of the camera body 104. The camera body 104 and the threaded seat 105 can be threadedly connected by the external thread 106 and the threaded seat 105. Specifically, after the mounting plate 103 is locked into the first locking groove 215 and the second locking groove 217, the camera body 104 is fixed by the cooperation of the threaded seat 105 and the external thread 106. When disassembly is required, the camera body 104 can be separated by rotating it in the reverse direction, avoiding damage to the assembly components. The snap-fit ​​structure of the mounting plate 103 ensures the overall mounting position of the camera is stable, while the detachable design allows for individual replacement of the camera body 104. For example, if the lens is damaged, only the body can be replaced without disassembling the entire assembly plate.

[0050] In this embodiment, the assembly connector includes a connecting locking plate 604 disposed on one side of the second assembly housing 202. The connecting locking plate 604 is provided with a third connecting through hole 602 penetrating its opposite sides and an oblong hole 603 penetrating its opposite sides. Further, the third connecting through hole 602 is a circular through hole, used for connection with fixing holes on the blackboard body via bolts to form a rigid fixation; the oblong hole 603 is an elongated through hole, its length direction parallel to the extension direction of the second assembly housing 202, allowing the bolt to move along the length direction within the hole to adjust the relative position between the first connecting plate 209 and the blackboard body. The third connecting through hole 602 and the oblong hole 603 are distributed at intervals along the length direction of the first connecting plate 209, forming a multi-point fixing structure, wherein the third connecting through hole 602 provides primary positioning, and the oblong hole 603 provides auxiliary positioning and position compensation.

[0051] Specifically, during installation, a bolt passes through the third connecting hole 602 and is threadedly connected to a fixing hole on the blackboard body, achieving initial positioning of the first connecting plate 209 and the blackboard body. Subsequently, another bolt passes through the oblong hole 603 and is connected to another fixing hole on the blackboard body. At this time, the bolt can slide along the length direction within the oblong hole 603 to compensate for any hole position deviations that may occur during assembly.

[0052] In this embodiment, an L-shaped snap-fit ​​plate 219 is provided on the side of the first assembly plate 207 near the second assembly plate 208. The L-shaped snap-fit ​​plate 219 and one side of the first assembly plate enclose a snap-fit ​​groove 220. Furthermore, the vertical side and the horizontal side of the L-shaped snap-fit ​​plate 219 form a right angle structure, and the horizontal side extends parallel to the side wall of the first assembly plate. The snap-fit ​​groove 220 is a rectangular space defined by the vertical side of the L-shaped snap-fit ​​plate 219 and the side wall of the first assembly plate.

[0053] Specifically, the side of the blackboard body 400 is guided into the snap-fit ​​groove 220, the vertical edge of the L-shaped snap-fit ​​plate 219 blocks the offset of the blackboard, and the side wall of the first assembly plate provides reverse support, forming a two-way clamping to maintain a stable posture after installation and avoid displacement caused by vibration or external force.

[0054] In this embodiment, a clearance 221 is provided between the L-shaped snap-fit ​​plate 219 and the second mounting plate 208 to avoid obstructing the lighting assembly 800. Furthermore, the width of the clearance 221 is set according to the light emission angle and light path coverage of the lighting assembly 800. The clearance extends along the length of the second mounting plate 208, and its longitudinal dimension covers the mounting area of ​​the lighting assembly 800 within the mounting housing. Specifically, when the control circuit board 700 is mounted to the receiving slot 205 via the positioning slide rail 206, the light from the lighting assembly 800 is projected outward through the clearance 221. Since the clearance covers the mounting area of ​​the lighting assembly 800, the light can pass through the clearance unobstructed to reach the shooting area of ​​the camera assembly 100, thus avoiding the formation of shadow areas due to structural obstruction.

[0055] In this embodiment, the first and second mounting shells are disposed on the left and / or right sides of the blackboard body 400, and the first camera 101 and the second camera 102 are tilted toward the center of the blackboard body 400. Furthermore, the tilt angle of the first camera 101 and the second camera 102 can be 30°-60°, preferably 45°. The two cameras are installed with a staggered vertical alignment and their camera faces tilted in opposite directions, achieving overlapping coverage of the central area of ​​the blackboard. This layout allows for capturing the entire writing area without dynamically adjusting the camera angles.

[0056] In this embodiment, one end of both the first inclined plate 214 and the second inclined plate 216 is arc-shaped and combined to form a U-shape. A partition opening is provided at the arc-shaped end of the first inclined plate 214 and the second inclined plate 216, and the other end of the first inclined plate 214 and the second inclined plate 216 is sealed by the first assembly housing 201. Further, the arc-shaped ends of the first inclined plate 214 and the second inclined plate 216 form a U-shaped structure, which, when combined, forms a continuous curved surface. The partition opening is located at the end region of the arc-shaped end, and the first assembly housing 201 seals the other end of the inclined plate. Specifically, the U-shaped structure formed by the arc-shaped ends of the first inclined plate 214 and the second inclined plate 216 facilitates the attachment of the cylindrical camera assembly 100. The partition opening at the end of the U-shaped structure enhances the elasticity of the first inclined plate 214 and the second inclined plate 216. The first assembly housing 201 seals the other end of the inclined plate, forming a semi-enclosed protective structure to prevent external contaminants from entering from the non-operating side.

[0057] In this embodiment, a blackboard mounting component 500 is also included. The blackboard mounting component 500 includes a first mounting vertical plate 501. A mounting horizontal plate 502 is integrally formed on the top and bottom of the first mounting vertical plate 501. A mounting eave 503 for connecting with the blackboard body 400 extends from the side of the mounting horizontal plate 502 near the blackboard body 400 toward the middle of the blackboard body 400. A second mounting vertical plate 503 for connecting with the blackboard body 400 is bent on the side of the first mounting vertical plate 501 near the blackboard body 400. 04. The mounting eaves 503 are provided with a fourth connecting through hole 505 penetrating its opposite sides; the second mounting vertical plate 504 is provided with a fifth connecting through hole 506 penetrating its opposite sides; the mounting horizontal plate 502 is provided with a sixth connecting through hole 508; a mounting bracket 507 is provided on one side of the mounting horizontal plate 502; the mounting bracket 507 is provided with a seventh connecting through hole 509 corresponding to the sixth connecting through hole 508 and an eighth connecting through hole 510 for connecting the mounting bracket 507 to external objects. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the substance of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An optical blackboard, characterized in that, include: A camera assembly (100) includes a first camera (101) and a second camera (102). An assembly assembly includes a first assembly housing (201), a second assembly housing (202) detachably connected to the top and bottom of the first assembly housing (201) via a detachable connection assembly, an upper mounting end (203) disposed at the top of the second assembly housing (202), and a lower mounting end (204) disposed at the bottom of the second assembly housing (202), wherein the first camera (101) and the second camera (102) are respectively mounted on the upper mounting end (203) and the lower mounting end (204); The blackboard includes two blackboard bodies (400), and a display device is provided between the two blackboard bodies (400). A first assembly housing (201) and a second assembly housing (202) are provided on the side of the two blackboard bodies (400) away from the display device. A receiving groove (205) is provided in the first assembly housing (201), and positioning slide rails (206) for mounting and positioning control circuit board (700) are provided on the opposite side walls of the receiving groove (205). An assembly connector is provided on the side of the second assembly housing (202) away from the first assembly housing (201). The assembly connector is used to detachably connect the blackboard body to the second assembly housing (202). An illumination component (800) is provided on the control circuit board (700) for supplementing light to the camera assembly (100).

2. The optical blackboard as described in claim 1, characterized in that, The first assembly housing (201) includes a first assembly plate (207) and a second assembly plate (208) disposed opposite to each other. The first assembly plate (207) and the second assembly plate (208) are connected by a connecting plate (209). A first guide groove (210) is provided on one side of the first assembly plate (207), and a second guide groove (211) is provided on the side of the second assembly plate (208) close to the first assembly plate (207). The first guide groove (210) cooperates with the second guide groove (211) to form the positioning slide rail (206).

3. The optical blackboard as described in claim 1, characterized in that, The second assembly housing (202) has two parts and is respectively disposed at the top and bottom of the first assembly housing (201). The mounting end includes a first mounting part (212) and a second mounting part (213). A first inclined plate (214) is provided on one side of the first mounting part (212), and a first engaging groove (215) is provided on the first inclined plate (214). A second inclined plate (216) is provided on the side of the second mounting part (213) close to the first mounting part (212), facing the first inclined plate (214). A second engaging groove (217) is provided on the second inclined plate (216) that is adapted to the first engaging groove (215).

4. The optical blackboard as described in claim 1, characterized in that, The detachable connection assembly includes a threaded post (301) on the second assembly housing (202), a first connection through hole (302) on the control circuit board (700), and a second connection through hole (303) on the first assembly housing (201). The threaded post (301) passes through the first connection through hole (302), and a bolt passes through the second connection through hole (303). The control circuit board (700) can be connected to the first assembly housing (201) and the assembly plate assembly by the bolt threadedly engaging with the threaded post (301).

5. The optical blackboard as described in claim 3, characterized in that, The second inclined plate (216) is provided with a snap-fit ​​limiting plate (218) that cooperates with the first snap-fit ​​groove (215) and the second snap-fit ​​groove (217) to snap-fit ​​the camera assembly (100).

6. The optical blackboard as described in claim 3, characterized in that, The assembly connector includes a connecting locking plate (604) disposed on one side of the second assembly housing (202). The connecting locking plate (604) is provided with a third connecting through hole (602) penetrating its opposite sides and an oval hole (603) penetrating its opposite sides.

7. The optical blackboard as described in claim 2, characterized in that, An L-shaped snap-fit ​​plate (219) is provided on the side of the first assembly plate (207) near the second assembly plate (208), and the L-shaped snap-fit ​​plate (219) and one side of the first assembly plate form a snap-fit ​​groove (220).

8. The optical blackboard as described in claim 7, characterized in that, A clearance (221) is provided between the L-shaped snap-fit ​​plate (219) and the second assembly plate (208) to avoid obstructing the lighting assembly (800).

9. The optical blackboard as described in claim 7, characterized in that, The first mounting shell and the second mounting shell are disposed on the left and / or right side of the blackboard body (400), and the first camera (101) and the second camera (102) are tilted toward the center of the blackboard body (400).

10. The optical blackboard as described in claim 3, characterized in that, One end of the first inclined plate (214) and the second inclined plate (216) are both arc-shaped and combined to form a U-shape. The arc-shaped end of the first inclined plate (214) and the second inclined plate (216) is provided with a partition opening. The other end of the first inclined plate (214) and the second inclined plate (216) is blocked by the first assembly housing (201).

Images