Guide mechanism for moving writing board and multimedia device

Abstract

The invention relates to a guide mechanism for movement of a writing board and a multimedia device, and belongs to the technical field of display equipment, the guide mechanism comprises a guide part and a sliding part, a trigger assembly is arranged on an extension path of the guide part, the sliding part is slidably connected with the guide part, and the sliding part is connected with the writing board through a connecting rod assembly; when the sliding part slides along the guide part, the writing board is driven to generate displacement parallel to the sliding direction of the sliding part; when the sliding part slides to the position where the trigger assembly is located, the trigger assembly is connected with the connecting rod assembly, the connecting rod assembly is driven to act, and the writing board is driven to generate displacement with a transverse component relative to the sliding direction of the sliding part. And space redundancy and waste are caused by coexistence of two independent devices.

Description

Technical Field

[0001] This invention belongs to the field of display device technology, and specifically relates to a guiding mechanism for moving a writing board and a multimedia device. Background Technology

[0002] In current collaborative settings such as teaching, seminars, and conferences, the rational selection of modern multimedia tools and their organic integration with traditional display methods like blackboard writing, ensuring their seamless integration throughout the entire activity, has become a crucial way to enhance information delivery. Constructing a logical interactive flow by integrating multiple media formats can significantly optimize overall communication. However, most commonly available display devices only support multimedia content presentation and lack support for on-site writing and real-time annotation, making it difficult to achieve effective synergy between modern digital media and traditional blackboard writing. Furthermore, simultaneously configuring separate display screens and writing boards within a space can lead to excessive space occupation and inconvenient layout, limiting their widespread application in space-constrained scenarios. Summary of the Invention

[0003] To address the shortcomings of existing technologies, a guiding mechanism and multimedia device for moving a writing board are proposed to solve the technical problems of difficulty in coordinating digital content display and real-time writing, and the space redundancy and waste caused by the coexistence of two independent devices.

[0004] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides a guiding mechanism for moving a writing board, comprising: A guide section is fixedly mounted on a support body, and a trigger component is provided on the extension path of the guide section; A sliding part is slidably connected to the guide part, and the sliding part is connected to the writing board via a linkage assembly; When the sliding part slides along the guide part, it causes the writing board to produce a displacement parallel to the sliding direction of the sliding part; when the sliding part slides to the position of the trigger component, the trigger component engages with the linkage component, drives the linkage component to move, and causes the writing board to produce a displacement with a lateral component relative to the sliding direction of the sliding part.

[0005] The technical solution is further configured such that the sliding part is also provided with a first self-locking component, which is used to lock the sliding part at any position in its sliding stroke; The first self-locking component includes a matching latch and a helical tooth. The latch is movably disposed on the sliding part, and an elastic element is disposed between the latch and the sliding part. The helical tooth is disposed on the guide part, and the elastic element provides a force to the latch to engage with the helical tooth, thereby achieving self-locking.

[0006] The technical solution is further configured such that the locking tongue is connected to the control component via a traction component, and the control component pulls the locking tongue via the traction component, causing it to overcome the force of the elastic component and disengage from the helical teeth, thereby achieving unlocking.

[0007] The technical solution is further configured such that the triggering component includes a rack segment disposed on the guide portion and a triggering gear disposed on the sliding portion, the triggering gear being connected to the connecting rod assembly; When the sliding part moves to the position of the rack segment, the trigger gear meshes with the rack segment; the continued movement of the sliding part drives the trigger gear to rotate, thereby driving the linkage assembly to move.

[0008] The technical solution is further configured such that the linkage assembly includes a first linkage, a second linkage, and a third linkage that are hinged sequentially. One end of the first linkage is connected to the trigger gear, and the other end is hinged to the sliding part. The second linkage is hinged to the first linkage, the sliding part, and the writing board, respectively. The third linkage is hinged to the second linkage and the writing board, respectively.

[0009] The technical solution is further configured such that the second connecting rod is provided with a meshing swing gear and a swing arm, the swing gear is connected to the first connecting rod, and the swing arm is hinged to the second connecting rod and the third connecting rod respectively.

[0010] This technical solution is further configured to include a second self-locking component, the second self-locking component including a pawl and a serpentine groove, the serpentine groove being disposed on the guide portion; The pawl can slide along the serpentine groove. During this process, when the sliding part moves to the point where the trigger gear disengages from the rack segment, the pawl engages with the trigger gear to lock the posture of the linkage assembly. When the trigger gear engages with the rack segment, the pawl disengages from the trigger gear to unlock the linkage assembly.

[0011] The technical solution is further configured such that the second self-locking component also includes a first slot perpendicular to the extension direction of the serpentine groove, and the axle of the trigger gear is embedded in the first slot and can slide along the first slot.

[0012] Secondly, the present invention provides a multimedia device, including a display screen and a writing board, wherein the guide mechanism for moving the writing board is provided behind the display screen. When the writing board is in the retracted state, it is stored behind the display screen. When the writing board is in the unfolded state, it moves from behind the display screen to the side of the display screen and becomes flush with the display screen.

[0013] The technical solution is further configured to include a bracket, wherein the display screen and the writing board are both mounted on the bracket, and the bracket is provided with casters. The beneficial effects of this invention are: By setting up a guide mechanism for moving the writing board, the writing board can be stored behind the display screen when not in use, overlapping the display screen in space. When in use, it can be quickly and stably moved to the writing position on the side of the display screen, realizing the combination of digital content display and instant writing. The structure is compact and is particularly suitable for use scenarios with limited space. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the assembly of the guide mechanism for moving the writing board and the writing board in an embodiment of the present invention; Figure 2 This is an assembly diagram of the sliding part and the connecting rod assembly in an embodiment of the present invention; Figure 3 This is an axial view of the guide portion and the sliding portion in an embodiment of the present invention; Figure 4 This is a top view of the guide portion and the sliding portion in an embodiment of the present invention; Figure 5 for Figure 4 Sectional view of AA; Figure 6 This is a schematic diagram of the pawl in an embodiment of the present invention; Figure 7 This is a schematic diagram of the writing board in a retracted state in an embodiment of the present invention; Figure 8 This is a schematic diagram of the writing board in a contracted state and an unfolded state in an embodiment of the present invention; Figure 9 This is a schematic diagram of the writing board in an unfolded state in an embodiment of the present invention; Figure 10 for Figure 3 Partial schematic diagram at point B in the middle; Figure 11 This is a schematic diagram of a multimedia device in an embodiment of the present invention; Figure 12 This is a schematic diagram of the multimedia device from another perspective in an embodiment of the present invention; Figure 13This is a schematic diagram of the multimedia device (excluding the side plate on the bracket) in an embodiment of the present invention.

[0015] In the attached drawings: 100, guide part; 101, helical gear; 102, rack segment; 103, serpentine groove; 200, sliding part; 201, slider; 202, second mounting base; 300, connecting rod assembly; 301, first connecting rod; 302, second connecting rod; 303, third connecting rod; 304, oscillating gear; 305, oscillating arm; 306, connecting arm; 307, first auxiliary rod; 308, second auxiliary rod; 309, third auxiliary rod; 31 0. Fourth auxiliary rod; 400. Writing board; 401. Third mounting base; 500. Trigger assembly; 501. Trigger gear; 600. First self-locking assembly; 601. Locking tongue; 602. Traction rod; 603. Connecting rod; 604. Elastic element; 700. Second self-locking assembly; 701. Pawl; 702. First slot; 703. Guide protrusion; 704. Pawl seat; 800. Display screen; 900. Bracket; 110. Moving wheel. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments in this application, other similar embodiments obtained by those skilled in the art without creative effort should all fall within the scope of protection of this application. Furthermore, directional terms mentioned in the following embodiments, such as "up," "down," "left," and "right," are only for reference to the directions in the accompanying drawings; therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

[0017] Example 1: According to an embodiment of the present invention, a guiding mechanism for moving a writing board is provided; please refer to [link to relevant documentation]. Figures 1 to 4 It includes a guide portion 100 and a sliding portion 200. The guide portion 100 is fixedly mounted on the support body, and the sliding portion 200 is slidably connected to the guide portion 100. At the same time, the sliding portion 200 is connected to the writing board 400 through a connecting rod assembly 300.

[0018] It is understood that the guide part 100 is designed as a straight structure, and the sliding part 200 is positioned above the guide part 100, with the two being engaged by a concave-convex matching structure. As the sliding part 200 slides along the guide part 100, it causes the writing board 400 to generate a linear displacement, which is parallel to the sliding direction of the sliding part 200, thereby realizing the movement of the writing board 400.

[0019] Optionally, in order to house the writing board 400 behind other components (such as a display screen) to achieve spatial overlap and save space, a trigger component 500 is provided on the extension path of the guide portion 100.

[0020] When the sliding part 200 slides along the guide part 100, it causes the writing board 400 to produce a displacement parallel to the sliding direction of the sliding part 200, that is, it pushes the writing board 400 linearly behind the other components. At this time, the writing board 400 is in a state parallel to the other components. When the sliding part 200 slides to the position of the trigger component 500, the trigger component 500 engages with the linkage component 300, driving the linkage component 300 to move, causing the writing board 400 to produce a displacement with a lateral component relative to the sliding direction of the sliding part 200. That is, it pushes the writing board 400 to a position flush with the other components, or pulls the writing board 400 from a position flush with the other components back to the rear of the other components. During this process, the writing board 400 first flips (at this time, the writing board 400 is not parallel to the other components) and then returns to a state parallel to the other components.

[0021] In one embodiment of this guide mechanism for moving a writing board, please refer to... Figures 1 to 5 The sliding part 200 is also provided with a first self-locking component 600, which is used to lock the sliding part 200 at any position in its sliding stroke, so as to lock the position of the writing board 400.

[0022] Optionally, the first self-locking component 600 includes a matching latch 601 and a helical tooth 101. The helical tooth 101 is disposed on the guide portion 100, and the latch 601 is movably disposed on the sliding portion 200. Specifically, the latch 601 can move along the height direction of the sliding portion 200. An elastic member 604 is disposed between the latch 601 and the sliding portion 200. The elastic member 604 provides a force to the latch 601 to engage with the helical tooth 101, thereby achieving self-locking.

[0023] It can be understood that the locking tongue 601 is located inside the sliding part 200. When the locking tongue 601 is pulled and moved up along the height direction of the sliding part 200, the elastic member 604 is compressed, and the locking tongue 601 separates from the helical tooth 101. At this time, the sliding part 200 can slide along the guide part 100. When the force disappears, the locking tongue 601 moves down along the height direction of the sliding part 200 under the action of the elastic member 604, and the locking tongue 601 is engaged in the helical tooth 101. At this time, the position of the sliding part 200 is fixed.

[0024] Optionally, the sliding part 200 is configured as a slider 201, which spans above the helical tooth 101. The slider 201 has a cavity inside to accommodate the locking tongue 601. A connecting rod 603 is provided above the locking tongue 601. The connecting rod 603 passes through the top of the slider 201 and can move up and down relative to the slider 201. An elastic element 604 is sleeved around the connecting rod 603.

[0025] Optionally, the guide portion 100 is designed with forward and reverse helical teeth 101. Correspondingly, the locking tongue 601 can engage with the forward and reverse helical teeth 101 respectively, so that the sliding portion 200 can achieve forward and reverse self-locking on the guide portion 100.

[0026] In one embodiment of this guide mechanism for moving a writing board, please refer to... Figures 1 to 5 The locking tongue 601 is provided with a traction rod 602. The traction rod 602 is connected to the control component through a traction member. The control component pulls the locking tongue 601 through the traction member and the traction rod 602, so that it overcomes the force of the elastic member 604 and disengages from the helical tooth 101, thereby unlocking.

[0027] Specifically, the traction component is a steel cable, and the control component is a trigger mounted on the writing board 400. Gripping the trigger pulls the locking tongue 601, releasing the self-locking mechanism; releasing the trigger engages the self-locking mechanism.

[0028] In one embodiment of this guide mechanism for moving a writing board, please refer to... Figures 1 to 3 ,as well as Figure 10 The triggering assembly 500 includes a rack segment 102 disposed on the guide portion 100 and a trigger gear 501 disposed on the sliding portion 200, the trigger gear 501 being connected to the connecting rod assembly 300.

[0029] Optionally, the helical tooth 101 is located at the top of the guide portion 100, the rack segment 102 is located on the side of the guide portion 100, and the sliding portion 200 is located above the rack segment 102, while the trigger gear 501 is located outside the sliding portion 200, so as to avoid the sliding portion 200 interfering with the meshing of the rack segment 102 and the trigger gear 501.

[0030] Understandably, the rack segment 102 is rotatably connected to the axle of the trigger gear 501 and the first mounting seat on the sliding part 200 via a local area located in the guide portion 100. When the sliding part 200 moves to the position of the rack segment 102, the trigger gear 501 meshes with the rack segment 102; the continued movement of the sliding part 200 drives the trigger gear 501 to rotate (self-rotate) around its axle, thereby driving the linkage assembly 300 to move.

[0031] In one embodiment of this guide mechanism for moving a writing board, please refer to... Figures 1 to 6 It also includes a second self-locking component 700, which includes a pawl 701 and a serpentine groove 103. The serpentine groove 103 is disposed on the guide portion 100, and the pawl 701 can slide along the serpentine groove 103.

[0032] Optionally, the extension direction of the serpentine groove 103 is parallel to the extension direction of the guide portion 100 and the helical tooth 101. Unlike the straight structure of the guide portion 100, the distance between the serpentine groove 103 and the helical tooth 101 varies. Specifically, the distance between a local portion of the serpentine groove 103 and the helical tooth 101 is greater than the distance between other portions of the serpentine groove 103 and the helical tooth 101. This local portion refers to the portion corresponding to the area where the rack segment 102 is located.

[0033] Understandably, during the sliding of the pawl 701 along the serpentine groove 103, when the trigger gear 501 engages with the rack segment 102, the distance between the pawl 701 and the trigger gear 501 increases, causing the pawl 701 to disengage from the trigger gear 501. The trigger gear 501 then rotates around its axle, thereby driving the linkage assembly 300 to move, and the linkage assembly 300 is in an unlocked state. When the sliding part 200 moves to the point where the trigger gear 501 disengages from the rack segment 102, the distance between the pawl 701 and the trigger gear 501 decreases, causing the pawl 701 to engage with the trigger gear 501. The trigger gear 501 cannot rotate, thereby locking the posture of the linkage assembly 300.

[0034] In one embodiment of this guide mechanism for moving a writing board, please refer to... Figures 1 to 6 The second self-locking component 700 also includes a first slot 702 perpendicular to the extension direction of the serpentine groove 103. The axle of the trigger gear 501 is embedded in the first slot 702 and can slide along the first slot 702, providing space for the change of the distance between the pawl 701 and the trigger gear 501.

[0035] Optionally, the second self-locking assembly 700 further includes a pawl seat 704, with a first slot 702 located on the pawl seat 704. One end of the pawl seat 704 extends protruding from its body to form a protrusion, and the pawl 701 is located on the side of the protrusion adjacent to the trigger gear 501. Simultaneously, a guide protrusion 703 is provided on the pawl seat 704, which is embedded inside the serpentine groove 103 and can slide along the serpentine groove 103.

[0036] It is understandable that when the sliding part 200 slides along the guide part 100, it drives the guide protrusion 703 to slide synchronously along the serpentine groove 103. Since the relative position of the trigger gear 501 and the sliding part 200 is fixed, it can only rotate. Therefore, when the distance between the serpentine groove 103 and the helical tooth 101 changes, it causes the axle of the trigger gear 501 to slide along the first slot 702, thereby changing the state of the pawl 701 and the trigger gear 501.

[0037] In one embodiment of this guide mechanism for moving a writing board, please refer to... Figures 1 to 10 The linkage assembly 300 includes a first linkage 301, a second linkage 302, and a third linkage 303, which are hinged sequentially. The first linkage 301 has a bent structure with a second slot on its short side. A connecting post is provided on the trigger gear 501, and the connecting post is embedded inside the second slot. The middle of the long side of the first linkage 301 is hinged to the second mounting seat 202 on the sliding part 200 via a first auxiliary rod 307, and the end of the long side of the first linkage 301 is hinged to the second linkage 302. The second linkage 302 also has a bent structure. Its first side is hinged to the second mounting seat 202 via two second auxiliary rods 308 that are hinged end-to-end, and its first side is connected to the end of the long side of the first linkage 301. Its second side is hinged to the third mounting seat 401 on the writing board 400 via two third auxiliary rods 309 that are hinged end-to-end, and its second side is hinged to the middle of the third linkage 303 via a fourth auxiliary rod 310. A sway gear 304 is rotatably connected to the bend of the second connecting rod 302. The sway gear 304 meshes with the arc-shaped tooth surface of one end of the sway arm 305. Simultaneously, the sway gear 304 is hinged to the middle of the long side of the first connecting rod 301 via a connecting arm 306. The middle of the sway arm 305 is hinged to the second side of the second connecting rod 302, and the other end of the sway arm 305 is hinged to one end of the third connecting rod 303 via a third slot. The other end of the third connecting rod 303 is hinged to the third mounting base 401. It can be understood that a four-bar linkage is formed between the second mounting base 202 and the first connecting rod 301, between the first connecting rod 301 and the second connecting rod 302, between the second connecting rod 302 and the third connecting rod 303, and between the third connecting rod 303 and the third mounting base 401.

[0038] Please see Figure 7 When the writing board 400 is in the retracted state, the pawl 701 meshes with the trigger gear 501, the connecting post is located at the end of the second slot, the first side of the second link 302 is perpendicular to the first link 301, and the third link 303 is perpendicular to the writing board 400. At this time, all linkage mechanisms are in the retracted state, and the writing board 400 is housed between the guide part 100 and the second link 302.

[0039] Please see Figure 8After the pawl 701 separates from the trigger gear 501, the trigger gear 501 rotates, and the connecting post slides along the second slot to its other end. During this process, the connecting post exerts a thrust on the first link 301, moving it away from the sliding part 200, causing the four-bar linkage between the second mounting base 202 and the first link 301 to gradually open. At the same time, the first link 301 and the four-bar linkage between the first link 301 and the second link 302 exert a thrust on the second link 302, causing it to swing around its hinge point with the first link 301. During the rotation of the second link 302, the thrust of the connecting arm 306 causes the swing gear 304 to rotate, which in turn drives the swing arm 305 to swing. The swinging motion of the swing arm 305 generates a thrust on the third link 303, causing the four-bar linkage between the second link 302 and the third link 303, as well as the four-bar linkage between the third link 303 and the third mounting base 401, to gradually open. At this time, one end of the third link 303 moves from one end of the third slot to the other end. In the above process, the rotation of the second link 302, combined with the opening operation of each four-bar linkage, causes the writing board 400 to move forward and flip, generating a displacement with a lateral component relative to the sliding direction of the sliding part 200.

[0040] Please see Figure 9 When the second link 302 swings to the point where its first side is parallel to the first link 301, the writing board 400 moves forward and flips into place, and is in the unfolded state. At this time, all linkage mechanisms are in the retracted state again, and the third link 303 is parallel to the writing board 400.

[0041] Example 2: According to an embodiment of the present invention, a multimedia device is provided; please refer to [link / reference]. Figures 1 to 13 It also includes a bracket 900, on which a display screen 800 and a writing board 400 are mounted, and on which casters 110 are mounted for easy movement.

[0042] Optionally, the support 900 has side plates on both the front and rear sides, and the display screen 800 is mounted on the side plates. A space for accommodating the writing board 400 is formed between the front and rear side plates. The guide mechanism for moving the writing board 400 is provided behind the display screen 800 and on the support 900.

[0043] Optionally, two writing boards 400 are symmetrically arranged, and each writing board 400 has a guide mechanism for moving the writing board 400 at its top and bottom.

[0044] When the writing board 400 is in the retracted state, it is completely stored behind the display screen 800.

[0045] Gripping the trigger unlocks the first self-locking component 600, pulling the writing board 400 outward causes the sliding part 200 to slide along the guide part 100, and the writing board 400 moves horizontally behind the display screen 800. At this time, the second self-locking component 700 is in a self-locking state. When the sliding part 200 slides to the position of the trigger component 500, the second self-locking component 700 unlocks, and the linkage component 300 starts to move, pushing the writing board 400 from the position behind the display screen 800 to a position flush with the display screen 800. At this time, the writing board 400 is in an unfolded state, that is, it moves from the rear of the display screen 800 to the side of the display screen 800. Releasing the trigger locks the first self-locking component 600.

[0046] Gripping the trigger again unlocks the first self-locking component 600, pushing the writing pad 400 inward. The sliding part 200 slides in the opposite direction along the guide part 100, and the linkage assembly 300 moves in the opposite direction, causing the writing pad 400 to retract and move behind the display screen 800. As the sliding part 200 moves away from the position of the trigger component 500, the second self-locking component 700 locks, locking the posture of the linkage assembly 300. The sliding part 200 continues to slide, driving the linkage assembly 300 until the writing pad 400 is fully retracted. Releasing the trigger fixes the position of the writing pad 400.

[0047] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0048] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0049] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0050] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0051] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A guiding mechanism for moving a writing board, characterized in that, include: A guide section is fixedly mounted on a support body, and a trigger component is provided on the extension path of the guide section; A sliding part is slidably connected to the guide part, and the sliding part is connected to the writing board via a linkage assembly; When the sliding part slides along the guide part, it causes the writing board to produce a displacement parallel to the sliding direction of the sliding part; when the sliding part slides to the position of the trigger component, the trigger component engages with the linkage component, drives the linkage component to move, and causes the writing board to produce a displacement with a lateral component relative to the sliding direction of the sliding part.

2. The guiding mechanism for moving a writing board according to claim 1, characterized in that, The sliding part is also provided with a first self-locking component, which is used to lock the sliding part at any position during its sliding stroke; The first self-locking component includes a matching latch and a helical tooth. The latch is movably disposed on the sliding part, and an elastic element is disposed between the latch and the sliding part. The helical tooth is disposed on the guide part, and the elastic element provides a force to the latch to engage with the helical tooth, thereby achieving self-locking.

3. The guiding mechanism for moving a writing board according to claim 2, characterized in that, The locking tongue is connected to the control component via a traction member. The control component pulls the locking tongue via the traction member, causing it to overcome the force of the elastic member and disengage from the helical teeth, thereby unlocking the device.

4. The guiding mechanism for moving a writing board according to claim 1, characterized in that, The triggering component includes a rack segment disposed on the guide portion and a triggering gear disposed on the sliding portion, the triggering gear being connected to the connecting rod assembly; When the sliding part moves to the position of the rack segment, the trigger gear meshes with the rack segment; the sliding part continues to move, driving the trigger gear to rotate, thereby driving the linkage assembly to move.

5. A guide mechanism for moving a writing board according to claim 4, characterized in that, The linkage assembly includes a first linkage, a second linkage, and a third linkage that are hinged in sequence. One end of the first linkage is connected to the trigger gear, and the other end is hinged to the sliding part. The second linkage is hinged to the first linkage, the sliding part, and the writing board, respectively. The third linkage is hinged to the second linkage and the writing board, respectively.

6. A guiding mechanism for moving a writing board according to claim 5, characterized in that, The second connecting rod is provided with a meshing sway gear and a sway arm. The sway gear is connected to the first connecting rod, and the sway arm is hinged to the second connecting rod and the third connecting rod respectively.

7. A guiding mechanism for moving a writing board according to claim 4, characterized in that, It also includes a second self-locking component, which includes a pawl and a serpentine groove, the serpentine groove being disposed on the guide portion; The pawl can slide along the serpentine groove. During this process, when the sliding part moves to the point where the trigger gear disengages from the rack segment, the pawl engages with the trigger gear to lock the posture of the linkage assembly. When the trigger gear engages with the rack segment, the pawl disengages from the trigger gear to unlock the linkage assembly.

8. A guiding mechanism for moving a writing board according to claim 7, characterized in that, The second self-locking component also includes a first slot perpendicular to the extension direction of the serpentine groove, the axle of the trigger gear being embedded in the first slot and slidable along the first slot.

9. A multimedia device, characterized in that, It includes a display screen and a writing board, and a guide mechanism for moving the writing board as described in any one of claims 1-8 is provided behind the display screen; When the writing board is in the retracted state, it is stored behind the display screen. When the writing board is in the unfolded state, it moves from behind the display screen to the side of the display screen and becomes flush with the display screen.

10. A multimedia device according to claim 9, characterized in that, It also includes a stand, and the display screen and the writing board are both mounted on the stand, which is equipped with casters.

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