Projection device

Abstract

The utility model relates to the technical field of projection, and provides a projection device which comprises a projection host and a holder, the holder comprises a base, a first driving mechanism, a first connecting rod and a second driving mechanism, the first driving mechanism is arranged in the base, the first connecting rod is provided with a first end and a second end, the first end is connected with the first driving mechanism, and the second end is connected with the second driving mechanism. The second end is provided with a projection host, the first driving mechanism is used for driving the first connecting rod to rotate so as to drive the projection host to swing around the first end, and the second driving mechanism is used for driving the projection host to rotate relative to the second end so that the projection host always keeps a horizontal posture in the swinging process; the projection host has a power-off position and a power-on position, and the projection host is folded on the base at the power-off position; and at the starting position, the projection host is separated from the base and extends to the target projection position. The overall size of the holder can be reduced, large-stroke movement of the projection host is achieved, the overall size during shutdown is reduced, and the risk that the projection host is collided is reduced.

Description

Technical Field

[0001] This application relates to the field of projection technology, and in particular to a projection device. Background Technology

[0002] Current projection equipment uses a motor-driven lead screw to move the projector back and forth relative to a wall-mounted display screen for projection. To project large images, existing pan-tilt units require a long-stroke lead screw (i.e., a relatively long lead screw) to allow the projector to extend further relative to the display screen. However, this increases the length of the pan-tilt unit along the forward and backward extension direction, resulting in a larger overall size. This makes it difficult to maintain a compact pan-tilt unit structure while pursuing a larger projection range (i.e., a longer stroke). Utility Model Content

[0003] The purpose of this application is to provide a projection device that aims to solve the contradiction between the large stroke and miniaturization of existing projection gimbals.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] Some embodiments of this application provide a projection device, including:

[0006] Projector host;

[0007] The gimbal includes: a base, a first drive mechanism, a first link, and a second drive mechanism. The first drive mechanism is disposed within the base. The first link has a first end and a second end. The first end is connected to the first drive mechanism, and the second end is provided with the projection host. The first drive mechanism is used to drive the first link to rotate, thereby causing the projection host to swing around the first end. The second drive mechanism is used to drive the projection host to rotate relative to the second end, so that the projection host always maintains a horizontal posture during the swinging process.

[0008] The projection host has a power-off position and a power-on position. In the power-off position, the projection host is folded up on the base. In the power-on position, the projection host detaches from the base and extends to the target projection position.

[0009] In some embodiments, the second drive mechanism includes:

[0010] The second motor is fixed inside the projection host;

[0011] The second transmission component is located inside the projection host and is connected to the output shaft of the second motor and the second end, respectively. The second motor is used to drive the projection host to rotate relative to the second end via the second transmission component.

[0012] In some embodiments, the second transmission component includes:

[0013] The worm gear is connected to the output shaft of the second motor;

[0014] The worm gear meshes with the worm.

[0015] The first connecting shaft is fixedly connected to the worm gear and the second end, respectively.

[0016] In some embodiments, the second drive mechanism further includes:

[0017] The second detection component is located inside the projection host and is used to detect the rotation angle of the projection host.

[0018] In some embodiments, the second drive mechanism includes:

[0019] The first fixed wheel is fixed inside the base and is coaxially arranged with the first end;

[0020] A second connecting shaft passes through the second end and is rotatable relative to the second end, and one end of the second connecting shaft is fixedly connected to the projection host.

[0021] The second fixed wheel is fixedly connected to the other end of the second connecting shaft and corresponds to the first fixed wheel;

[0022] The second timing belt is wound around the first fixed pulley and the second fixed pulley.

[0023] In some embodiments, the second drive mechanism further includes:

[0024] The second tensioning component is disposed on the first connecting rod and located between the first fixed wheel and the second fixed wheel, and is used to adjust the tension of the second timing belt.

[0025] In some embodiments, the first drive mechanism includes:

[0026] The first motor is fixed inside the base;

[0027] A first transmission component is disposed within the base and is connected to the output shaft of the first motor and the first end, respectively. The first motor is used to drive the first connecting rod to rotate via the first transmission component.

[0028] In some embodiments, the first transmission component includes a driving wheel, a driven wheel, and a first synchronous belt wound around the driving wheel and the driven wheel. The driving wheel is connected to the output shaft of the first motor, and the driven wheel is connected to the first end.

[0029] The first drive mechanism further includes a first tensioning component disposed within the base. The first tensioning component is connected to the first motor and is used to adjust the position of the first motor relative to the driven wheel, so as to adjust the tension of the first synchronous belt.

[0030] In some embodiments, the first drive mechanism further includes:

[0031] The first detection component is located inside the base and is used to detect the rotation angle of the first connecting rod.

[0032] In some embodiments, the gimbal further includes:

[0033] The second link is distributed at intervals relative to the first link along the length of the base. The two ends of the second link are rotatably connected to the base and the projection host, respectively, and the second link can rotate synchronously with the first link.

[0034] The advantages of the projection device provided in this application are as follows: Compared with the prior art, the pan-tilt unit of this application uses a linkage to drive the projector to swing and rotate, replacing the linear telescopic movement design of the traditional pan-tilt unit. This significantly shortens the length of the pan-tilt unit in the front-to-back direction, thereby reducing the overall size of the pan-tilt unit. Furthermore, it enables a large-stroke (long-distance projection) movement of the projector when it is powered on, while compactly folding it onto the base when powered off, effectively reducing the overall size of the unit when powered off, occupying less space, and reducing the risk of the projector being bumped or knocked. In addition, the second drive mechanism ensures that the projector remains horizontal during the swinging process, guaranteeing the quality and stability of the projection. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application, 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of an existing projection device;

[0037] Figure 2 This is a schematic diagram of the internal drive structure of an existing gimbal;

[0038] Figure 3 This is an assembly diagram of the projection device provided in the embodiments of this application;

[0039] Figure 4 for Figure 3 Sectional view at point AA;

[0040] Figure 5 This is a schematic diagram of the projection device in the off position according to an embodiment of this application;

[0041] Figure 6 This is a schematic diagram of the projection device in the power-on position according to an embodiment of this application;

[0042] Figure 7 This is a schematic diagram of the power-on process of the projection device provided in the embodiments of this application;

[0043] Figure 8 This is one of the structural schematic diagrams of the projection device provided in the embodiments of this application;

[0044] Figure 9 This is a second schematic diagram of the projection device provided in the embodiments of this application;

[0045] Figure 10 A schematic diagram of the structure of the first driving mechanism provided in an embodiment of this application from one perspective;

[0046] Figure 11 This is a structural schematic diagram of the first driving mechanism provided in an embodiment of the present application from another perspective;

[0047] Figure 12 This is a schematic diagram of the structure of the projection host provided in the embodiments of this application;

[0048] Figure 13 This is a schematic diagram of the structure of the base provided in the embodiments of this application;

[0049] Figure 14 This is a schematic diagram of the structure of the second drive mechanism provided in an embodiment of this application;

[0050] Figure 15 An exploded view of the structure of the second drive mechanism provided in the embodiments of this application;

[0051] Figure 16 This is the third schematic diagram of the projection device provided in the embodiments of this application;

[0052] Figure 17 Fourth schematic diagram of the projection device provided in the embodiments of this application;

[0053] Figure 18 A structural assembly drawing of the second drive mechanism provided in an embodiment of this application;

[0054] Figure 19 An exploded view of the assembly of the second fixed wheel provided in an embodiment of this application;

[0055] Figure 20 This is another structural assembly drawing of the second drive mechanism provided in the embodiments of this application;

[0056] Figure 21 for Figure 20 A magnified view of section B.

[0057] The following are the labeling elements in the figure:

[0058] 1. Projector main unit; 101. Light outlet; 102. First clearance notch;

[0059] 2. Gimbal; 201. Base; 202. First drive mechanism; 203. First link; 204. Second drive mechanism;

[0060] 205. First end; 206. Second end; 207. Base plate; 208. Cover; 209. First motor;

[0061] 210. First transmission component; 211. Fixed base; 212. Driving pulley; 213. Driven pulley; 214. First synchronous belt;

[0062] 215. First tensioning component; 216. First rotating shaft; 217. First support plate; 218. Slide;

[0063] 219. First slotted hole; 220. Tensioning screw; 221. Connecting seat; 222. Push-pull rod; 223. Second connecting rod;

[0064] 224. Second support plate; 225. Third support plate; 226. Second rotating shaft; 227. Third rotating shaft;

[0065] 228. First detection component; 229. First sensing element; 230. First photoelectric sensor; 231. Second clearance notch;

[0066] 232. Second motor; 233. Second transmission component; 234. Base; 235. Worm gear; 236. Worm wheel;

[0067] 237. First connecting shaft; 238. Motor base; 239. Coupling; 240. First support base; 241. First bearing;

[0068] 242. Second support seat; 243. Second bearing; 244. First limiting seat; 245. Second limiting seat;

[0069] 246. Second detection component; 247. Second sensing element; 248. Second photoelectric sensor; 249. Second light-transmitting notch;

[0070] 250. First fixed pulley; 251. Second connecting shaft; 252. Second fixed pulley; 253. Second timing belt;

[0071] 254. Fourth support plate; 255. Third bearing; 256. Bushing; 257. Second tensioning component; 258. Second slotted hole;

[0072] 259. First tensioning wheel; 260. Second tensioning wheel; 261. First fixed shaft; 262. Tensioning nut;

[0073] 263. Second fixed shaft; 264. First protective cover; 265. Second protective cover;

[0074] 3. Display screen; 4. Wall; 5. Fixed base; 6. Movable base; 7. Motor; 8. Lead screw; 9. Moving parts. Detailed Implementation

[0075] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0076] In the description of the embodiments of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 the embodiments of this application 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 the embodiments of this application.

[0077] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0078] In the embodiments of this application, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0079] Reference Figure 1 and Figure 2 As shown, existing projection equipment mainly includes a projector 1 and a pan-tilt unit 2. The pan-tilt unit 2 drives the projector 1 to move relative to a display screen on the wall, thereby achieving projection. The existing pan-tilt unit 2 mainly includes a fixed base 5 and a movable base 6 that can extend and retract on the fixed base 5. The projector 1 is mounted on the movable base 6. The fixed base 5 contains a motor 7 and a lead screw 8, which are connected to the lead screw 8. The lead screw 8 has a threaded movable component 9, which is fixedly connected to the movable base 6. When the motor 7 rotates, it drives the movable component 9 on the lead screw 8 to move linearly along the lead screw 8, thereby causing the movable base 6 and the projector 1 on it to extend and retract relative to the display screen. To achieve large-size projection, traditional pan-tilt unit designs require a long-stroke lead screw (i.e., a longer lead screw 8) to allow the projector 1 to extend a greater distance relative to the display screen. However, a longer lead screw 8 results in a corresponding increase in the length of the fixed base 5 along the extension and retraction direction, increasing the overall size of the pan-tilt unit 2. This makes it difficult to maintain the miniaturization of the gimbal 2 structure while pursuing a larger projection range (i.e., a larger travel).

[0080] To address the aforementioned technical problems, this application provides a novel projection device. Its pan-tilt unit uses a linkage to drive the projector to swing and rotate, replacing the traditional linear telescopic movement design of the pan-tilt unit. This significantly shortens the length of the pan-tilt unit in the front-to-back direction, thereby reducing the overall size of the pan-tilt unit. It also enables the projector to extend with a large stroke (long-distance projection) when powered on, and can be compactly folded on the base when powered off, effectively reducing the overall size of the device when powered off, occupying little space, and reducing the risk of the projector being bumped or knocked.

[0081] In some embodiments, refer to Figures 3 to 18 As shown, this application provides a projection device, including a projector host 1 and a pan-tilt unit 2. The pan-tilt unit 2 includes a base 201, a first drive mechanism 202, a first connecting rod 203, and a second drive mechanism 204. The first drive mechanism 202 is disposed within the base 201. The first connecting rod 203 has a first end 205 and a second end 206. The first end 205 is connected to the first drive mechanism 202, and the second end 206 is provided with the projector host 1. The first drive mechanism 202 drives the first connecting rod 203 to rotate, thereby causing the projector host 1 to swing around the first end 205. The second drive mechanism 204 drives the projector host 1 to rotate relative to the second end 206, so that the projector host 1 maintains a horizontal posture during the swinging process. The projector host 1 has a power-off position and a power-on position. In the power-off position, the projector host 1 is folded onto the base 201, as shown below. Figure 5 As shown; in the power-on position, the projector 1 detaches from the base 201 and extends to the target projection position, as shown. Figure 6 As shown.

[0082] The projector host 1 refers to the core device in the projection apparatus responsible for generating images and projecting them onto the display screen 3 on the wall 4. It can be a traditional lamp-based projector or a laser projector using a laser light source, etc. Figure 5 and Figure 6 As shown, the projector 1 can be square in shape. The top of the projector 1 has a light-emitting port 101 for emitting light and projecting the image onto the display screen 3. The projector 1, connected to the first link 203 and the second drive mechanism 204 in the pan-tilt unit 2, can swing around a fixed point (i.e., the first end 205 of the first link 203) while maintaining a horizontal posture. This ensures that the projected image remains stable regardless of its position, without tilting or distortion. A horizontal posture means the projector 1 is parallel to the horizontal plane. In this posture, the light-emitting port 101 remains always in the upper position, allowing it to be aligned with the display screen 3 and ensuring a good projection effect. Furthermore, since the projector 1 has its wiring on its back side near the wall 4, maintaining a horizontal posture also prevents the wires from becoming tangled due to rotation.

[0083] The base 201, as the fundamental component of the entire gimbal 2 structure, provides a stable support platform. The base 201 houses a first drive mechanism 202, which drives the first connecting rod 203 to rotate. This technical solution effectively integrates the power source into the base 201, ensuring both the compactness of the overall structure and improving the stability and reliability of the system. Furthermore, when the projector 1 is in the off position, it can be folded back and tightly fitted or stored on the base 201. This not only reduces the overall size of the device but also provides additional protection for the projector 1, preventing damage from external collisions or other factors. Therefore, the base 201 of the gimbal 2 is not only the basic frame supporting the various components but also integrates the necessary drive elements and provides a safe and reliable docking point for the projector 1, ensuring it can be smoothly deployed during use and properly stored when not in use. Optionally, as... Figure 8 , Figure 9 and Figure 13 As shown, the base 201 can be square in shape, and the base 201 can include a base plate 207 and a cover shell 208 covering the base plate 207. The base plate 207 and the cover shell 208 can be connected by fasteners such as screws, so as to facilitate the installation, removal and maintenance of internal components.

[0084] The first drive mechanism 202 is a drive component located inside the base 201. Its main function is to provide power support for the projector 1, enabling it to swing by driving the first link 203. Specifically, the first drive mechanism 202 drives the first link 203 to rotate around its first end 205. This action allows the projector 1, mounted on the second end 206 of the first link 203, to unfold or retract from the base 201. When the projection device is powered on, the first drive mechanism 202 activates, pushing the first link 203 to swing outward (forward), moving the projector 1 to the target projection position; when powered off, the operation is reversed, causing the projector 1 to return and be stored on the base 201. It can be understood that the target projection position refers to the position set according to the user's actual needs, allowing the projector 1 to project an image of ideal size and clarity. This position can be dynamically designed and adjusted based on factors such as the user's usage scenario, room layout, screen size, and desired viewing experience.

[0085] The first link 203 is a mechanical transmission component connecting the base 201 and the projector 1 in the projection device. The first link 203 can be a rigid member with two ends, and can be designed as a rod or arm. One end (referred to as the first end 205) is connected to the first drive mechanism 202 within the base 201, and the other end (referred to as the second end 206) is where the projector 1 is mounted. The main function of the first link 203 is to act as a medium for transmitting force and motion. When the first drive mechanism 202 is activated, it drives the first link 203 to rotate around the first end 205. This rotation drives the movement of the entire link, and consequently affects the position of the projector 1 mounted on the second end 206. Through the rotation of the first link 203, the projector 1 can be extended from the base 201 to the target projection position, or retracted from the target projection position and folded back onto the base 201. This action allows the projector 1 to adjust its projection distance and projection angle relative to the display screen 3 as needed, thereby achieving a better projection effect.

[0086] The second drive mechanism 204 is a key component in the projection device responsible for ensuring that the projector 1 maintains a horizontal posture during its swinging motion. When the first drive mechanism 202 drives the first link 203 to rotate, causing the projector 1 to swing around the first end 205 of the first link 203, the second drive mechanism 204 works synchronously, driving the projector 1 to rotate relative to the second end 206 of the first link 203. This is done to ensure that the projector 1 remains horizontal regardless of its position (whether unfolded or folded), meaning the projector 1 is always parallel to the horizontal plane, keeping the light outlet 101 always in the upper position. By maintaining the horizontal posture of the projector 1, unnecessary tilting or distortion of the projected image can be effectively prevented, thereby improving the viewing experience.

[0087] It is understood that the gimbal 2 structure of this application is a dual-degree-of-freedom motion control structure. Specifically, the first drive mechanism 202, in conjunction with the first connecting rod 203, realizes the rotational unfolding / retracting motion (i.e., extension / retraction) of the projector 1. The second drive mechanism 204 realizes the attitude adjustment of the projector 1, ensuring that it maintains a horizontal attitude throughout the swinging process. This technical solution abandons the traditional linear screw drive method and adopts a connecting rod combined with a drive mechanism and attitude compensation to achieve adaptive attitude adjustment of the projector 1 during the swinging and flipping process.

[0088] The following reference Figures 5 to 9 , Figure 16 and Figure 17 The working principle of the projection device provided in this application is briefly described, wherein, Figure 7 (a) is the power-off position, (b) is the intermediate transition position, and (c) is the target projection position.

[0089] Power-on process (unfolding the projector 1): The first drive mechanism 202 is activated, driving the first link 203 to rotate forward (i.e., the side facing the user) around its first end 205; the projector 1 is pushed forward out of the base 201 as the first link 203 swings, moving toward the target projection position; during this process, the second drive mechanism 204 works synchronously, driving the projector 1 to rotate relative to the second end 206 of the first link 203 to counteract the tilt caused by the swing of the first link 203, so that the projector 1 is always in a horizontal position, ensuring that the light outlet 101 faces upward, accurately aligned with the display screen 3 and starting normal projection.

[0090] Power-off process (retracting projector 1): The first drive mechanism 202 rotates in reverse, causing the first connecting rod 203 to swing backward (towards the wall 4), and the projector 1 falls back to above the base 201. During this process, the second drive mechanism 204 acts simultaneously, adjusting the posture of the projector 1 to maintain a horizontal state, so that the projector 1 eventually returns smoothly to the base 201, that is, back to the initial power-off position. Figure 4 As shown, at this time, the back of the projector 1 can be tightly fitted to the wall 4, and is in a wall-mounted state, which completes the storage and reduces the space occupied. This achieves the effect of small size and wall-mounted design, avoids the projector 1 being exposed, reduces the risk of bumps and knocks, and effectively improves the safety and reliability of use.

[0091] Therefore, the projection device provided in this application embodiment, by using a drive mechanism to drive the linkage to swing and flip the projection host 1, replaces the linear telescopic movement design of the traditional pan-tilt head. This can significantly shorten the length of the pan-tilt head 2 in the front-to-back direction, thereby reducing the overall volume of the pan-tilt head 2. Furthermore, it can achieve a large stroke (long-distance projection) movement of the projection host 1 when it is powered on and extended, cleverly solving the contradiction between the large stroke and miniaturization of the traditional projection pan-tilt head.

[0092] In some embodiments, refer to Figures 8 to 10 , Figures 16 to 18 As shown, the first drive mechanism 202 includes a first motor 209 and a first transmission component 210. The first motor 209 is fixed inside the base 201. The first transmission component 210 is disposed inside the base 201 and is connected to the output shaft of the first motor 209 and the first end 205 of the first connecting rod 203 respectively. The first motor 209 is used to drive the first connecting rod 203 to rotate via the first transmission component 210.

[0093] The first motor 209 is the power source for the first drive mechanism 202. The first motor 209 can be fixedly mounted on the base plate 207 of the base 201 via the mounting bracket 211. Its main function is to provide the necessary driving force to rotate the first connecting rod 203.

[0094] The function of the first transmission component 210 is to effectively transmit the rotational motion generated by the first motor 209 to the first connecting rod 203, so that the first connecting rod 203 can rotate precisely around its first end 205. The first transmission component 210 may include gears, belts, or other mechanical transmission components.

[0095] When the projector 1 needs to be extended or retracted, the first motor 209 is activated. It outputs rotational torque through its output shaft. After receiving the rotational force from the first motor 209, the first transmission component 210 converts it into an effective force on the first connecting rod 203. Since one end of the first connecting rod 203 is connected to the first motor 209 and the other end is connected to the projector 1, when the first motor 209 drives the first connecting rod 203 to rotate via the first transmission component 210, the entire projector 1 will swing accordingly. This technical solution allows the projector 1 to swing outward (forward) from the base 201 to the target projection position, or to retract inward (backward) to the power-off position on the base 201.

[0096] This embodiment of the application achieves efficient and precise control of the first connecting rod 203 and the projection host 1 it carries through the coordinated operation of the first motor 209 and the first transmission component 210.

[0097] In some embodiments, refer to Figures 8 to 11 , Figures 16 to 18 , Figure 20 As shown, the first transmission component 210 includes a driving wheel 212, a driven wheel 213, and a first synchronous belt 214 wound around the driving wheel 212 and the driven wheel 213. The driving wheel 212 is connected to the output shaft of the first motor 209, and the driven wheel 213 is connected to the first end 205 of the first connecting rod 203. The first drive mechanism 202 also includes a first tensioning component 215 disposed in the base 201. The first tensioning component 215 is connected to the first motor 209 and is used to adjust the position of the first motor 209 relative to the driven wheel 213 to adjust the tension of the first synchronous belt 214.

[0098] The drive wheel 212 is located on the outside of the fixed base 211 facing away from the first motor 209. The drive wheel 212 is connected to the output shaft of the first motor 209. When the first motor 209 is running, the drive wheel 212 transmits the rotational force to the first synchronous belt 214.

[0099] Driven wheel 213 can be connected to the outside of fixed base 211 facing away from first motor 209 via first rotating shaft 216. The base plate 207 of base 201 is provided with a first support plate 217 for supporting the drive wheel 213 facing away from fixed base 211 and passes through the first rotating shaft 216. First connecting rod 203 is provided on the outside of first support plate 217 facing away from driven wheel 213, and the first end 205 of first connecting rod 203 is connected to first rotating shaft 216. The rotational force of driven wheel 213 is transmitted to first connecting rod 203 through first rotating shaft 216, thereby driving first connecting rod 203 to rotate.

[0100] The first synchronous belt 214 is wound around the driving wheel 212 and the driven wheel 213, serving as a medium for transmitting power between them. The design of the first synchronous belt 214 ensures efficient power transmission. When the first motor 209 starts, the driving wheel 212 rotates accordingly, transmitting rotational torque to the driven wheel 213 via the first synchronous belt 214. As the driven wheel 213 rotates, it drives the first end 205 of the first connecting rod 203 via the first rotating shaft 216, causing the entire first connecting rod 203 to rotate around its first end 205, thereby causing the projection host 1 at the second end 206 to swing and flip as a whole.

[0101] The first tensioning component 215 is an additional mechanical assembly installed within the base 201 and connected to the first motor 209. Its main function is to adjust the position of the first motor 209 relative to the driven pulley 213. Since the driving pulley 212 is connected to the first motor 209, adjusting the position of the first motor 209 synchronously adjusts the position of the driving pulley 212 relative to the driven pulley 213, thereby controlling the tension of the first timing belt 214. Understandably, if the timing belt is too loose, it will reduce power transmission efficiency and even cause slippage; while if it is too tight, it will increase system wear and consume more energy. Therefore, by adjusting the tension of the timing belt, unnecessary wear can be reduced, the service life of the entire transmission system can be extended, and the equipment can maintain efficient operation.

[0102] As an example, such as Figure 11 and Figure 20 As shown, the first tensioning component 215 includes a slide 218, and the first motor 209 is fixed on the slide 218. The slide 218 is located on the inner side of the fixed base 211 facing away from the driving wheel 212, and can move towards or away from the driven wheel 213. By moving the position of the slide 218, the first motor 209 can be driven to move, thereby driving the driving wheel 212 connected to the first motor 209 to move relative to the driven wheel 213, thereby realizing the tension adjustment of the first synchronous belt 214. Optionally, the first tensioning component 215 further includes a tensioning screw 220. The upper and lower sides of the slide 218 can each be provided with a first strip-shaped hole 219 extending towards the driven wheel 213. Each first strip-shaped hole 219 corresponds to a tensioning screw 220. The tensioning screw 220 passes through the corresponding first strip-shaped hole 219 and is connected to the fixed seat 211. The fixed seat 211 has a connecting seat 221 at its end away from the driven wheel 213, and the connecting seat 221 has a through hole. A push-pull rod 222 is provided on the side of the slide 218 adjacent to the connecting seat 221, and the push-pull rod 222 passes through the through hole. When it is necessary to adjust the tension of the first synchronous belt 214, the tensioning screw 220 can be loosened first, and then the slide 218 can be pushed by the push-pull rod 222 to move it closer to or further away from the driven wheel 213, so that the first synchronous belt 214 reaches a suitable tension. After adjustment, the tensioning screw 220 is tightened again.

[0103] Therefore, by introducing a pulley transmission mechanism and a tensioning component, this embodiment of the application not only achieves effective control of the first connecting rod 203 and the projection host 1 it carries, but also improves the reliability of the system.

[0104] In some embodiments, refer to Figures 8 to 10 , Figures 16 to 18 As shown, the gimbal 2 also includes a second link 223. The second link 223 and the first link 203 are distributed at intervals relative to each other along the length direction X of the base 201. The two ends of the second link 223 are rotatably connected to the base 201 and the projection host 1, respectively, and the second link 223 can rotate synchronously with the first link 203.

[0105] A second support plate 224 and a third support plate 225 for supporting functions can be arranged side by side at intervals on the base plate 207 of the base 201. The second support plate 224 and the third support plate 225 are arranged parallel to the first support plate 217. The second support plate 224 is located between the fixed base 211 and the third support plate 225. A second rotating shaft 226 is passed through the second support plate 224 and the third support plate 225. The second rotating shaft 226 is coaxial with the first rotating shaft 216. A second connecting rod 223 is located on the outside of the third support plate 225 facing away from the second support plate 224. One end of the second connecting rod 223 is connected to the second rotating shaft 226. The other end of the second connecting rod 223 can be connected to the projection host 1 through the third rotating shaft 227. The second connecting rod 223 is arranged parallel to the first connecting rod 203.

[0106] When the first motor 209 of the first drive mechanism 202 starts, it drives the first connecting rod 203 to rotate around its first end 205, simultaneously causing the second connecting rod 223 to move together, ensuring a consistent angle change between the two. The combined action of the two connecting rods significantly improves the mechanical stability of the entire system. Compared to a single-link design, the dual-link system is more resistant to external disturbances, such as minor collisions or vibrations, ensuring that the projector 1 can always smoothly reach the target projection position or return to the off position. Furthermore, combined with the action of the second drive mechanism 204, the simultaneous movement of the two connecting rods further ensures that the projector 1 maintains a horizontal posture throughout the entire swing process, contributing to high-quality projection. In addition, by distributing the load on the first connecting rod 203, the pressure on a single component is reduced, extending its service life and lowering maintenance costs.

[0107] Therefore, by introducing a dual-link collaborative design, the embodiments of this application not only improve the stability of the projection host 1 during movement, but also enhance the reliability and durability of the entire device.

[0108] In some embodiments, refer to Figure 9 , Figure 10 and Figure 18 As shown, the first drive mechanism 202 further includes a first detection component 228, which is disposed in the base 201 and is used to detect the rotation angle of the first connecting rod 203.

[0109] This application does not impose any particular limitation on the specific type of the first detection component 228, such as an encoder, a photoelectric sensor, or other types of sensors. Its main function is to monitor the rotation angle of the first connecting rod 203 relative to the base 201 in real time. As an example, such as... Figure 10 and Figure 18 As shown, the projection device also includes a controller (not shown in the figure), which can be located in the base 201 or the projection host 1, and is used to control the operation of the entire device. The first detection component 228 may include a first sensing sheet 229 and a first photoelectric sensor 230. The first sensing sheet 229 can be connected to the second rotating shaft 226 and located between the second support plate 224 and the third support plate 225. Optionally, the first sensing sheet 229 can also be connected to the first rotating shaft 216. The outer periphery of the first sensing sheet 229 is provided with one or more first light-transmitting notches. The first photoelectric sensor 230 is fixed on the bottom plate 207 of the base 201 and is arranged opposite to the first sensing sheet 229. When the first sensing sheet 229 rotates with the second rotating shaft 226, the first light-transmitting notches on it will periodically pass through the first photoelectric sensor 230. Whenever the first light-transmitting notch reaches the position of the first photoelectric sensor 230, light can pass through the first light-transmitting notch, causing the first photoelectric sensor 230 to receive a change in the light signal. The first photoelectric sensor 230 generates pulse signals based on the light transmission status of the first light-transmitting notch on the first sensing element 229. Each pulse represents a certain angle of rotation of the first sensing element 229. The first photoelectric sensor 230 converts the detected pulse signals into electrical signals and sends them to the controller. Based on these signals, the controller calculates the actual rotation angle of the first connecting rod 203, thereby achieving precise control of the position of the projector host 1.

[0110] Understandably, when the first motor 209 drives the first link 203 to rotate, the first detection component 228 continuously monitors the rotation angle of the first link 203 and feeds this data back to the controller. Based on the feedback information provided by the first detection component 228, the controller can achieve precise closed-loop control of the rotation angle of the first link 203. This means that the device can adjust the output of the first motor 209 according to actual needs to ensure that the first link 203 can accurately move to the preset target position (corresponding to a set rotation angle).

[0111] When powered on: When the user starts the projection device, the controller combines the set rotation angle corresponding to the target projection position with the actual angle information provided by the first detection component 228, compares the two angle deviations, and controls the output of the first motor 209 according to the angle deviation, so that the first connecting rod 203 rotates to the set rotation angle, thereby driving the projection host 1 to unfold to the specified target projection position.

[0112] When powered off: When the device is powered off, using the data from the first detection component 228, the first motor 209 drives the first connecting rod 203 to rotate in the opposite direction, causing the projector 1 to accurately return to and fold back onto the base 201 at its initial zero-point position. This position can be understood as the power-off position, that is, the position where the projector 1 is stored on the base 201 and against the wall 4. Figure 4 As shown.

[0113] Therefore, by monitoring the rotation angle of the first link 203 in real time, the position of the projection host 1 can be controlled more accurately, avoiding positional deviations caused by mechanical tolerances or external interference, and enhancing the stability and reliability of the entire device.

[0114] In some embodiments, refer to Figure 9 , Figure 12 , Figure 13 and Figure 17 As shown, the projector 1 has first clearance notches 102 penetrating the bottom and back surfaces on both sides along the length direction X. Correspondingly, the cover 208 of the base 201 has second clearance notches 231 penetrating the top and front surfaces on both sides along the length direction X. Each first clearance notch 102 corresponds to each second clearance notch 231. A first connecting rod 203 passes through the first clearance notch 102 and the second clearance notch 231 on one side, and a second connecting rod 223 passes through the first clearance notch 102 and the second clearance notch 231 on the other side. This design allows both ends of each connecting rod to extend into the base 201 and the projector 1 for connection, and also provides a certain guiding effect for each connecting rod, ensuring that each connecting rod rotates smoothly and unobstructed along its corresponding notch path, improving operational stability. Furthermore, this through-notch design minimizes the overall size of the device while maintaining functional integrity, making it more compact. This is particularly important for desktop or wall-mounted installations, as it reduces the space requirements of the surrounding environment.

[0115] Therefore, the embodiments of this application achieve effective installation and guidance of the linkage structure through the design of the avoidance notch, ensuring smooth operation of the projection host 1 during unfolding and folding, while achieving the purpose of a compact structure.

[0116] The second drive mechanism 204 provided in this application will now be described.

[0117] In some embodiments, refer to Figure 9 , Figure 14 and Figure 15 As shown, the second drive mechanism 204 includes: a second motor 232 and a second transmission component 233. The second motor 232 is fixed inside the projector host 1. The second transmission component 233 is disposed inside the projector host 1 and is connected to the output shaft of the second motor 232 and the second end 206 of the first connecting rod 203 respectively. The second motor 232 is used to drive the projector host 1 to rotate relative to the second end 206 of the first connecting rod 203 via the second transmission component 233.

[0118] The second motor 232 is the power source for the second drive mechanism 204 and can be fixedly mounted on the back, bottom, or top of the projector 1 via the base 234. Its main function is to provide the necessary driving force to adjust the angle of the projector 1 relative to the horizontal plane. The second transmission component 233 effectively transmits the rotational force generated by the second motor 232 to the projector 1, enabling it to make fine adjustments during oscillation and maintain a horizontal posture. Specifically, the projector 1 has a preset target angle value corresponding to its horizontal posture. The second motor 232 adjusts its output in real time according to this target angle value to adjust the actual angle of the projector 1 relative to the horizontal plane until the target angle value is reached, thereby achieving fine-tuning of the horizontal posture. The second transmission component 233 may include gears, belts, or other mechanical transmission components.

[0119] Power-on Deployment: When the projection device is powered on, the first motor 209 starts, pushing the first linkage 203 to swing forward, moving the projector 1 to the target projection position. During this process, based on the start signal of the first motor 209, the second motor 232 also starts synchronously, transmitting rotational torque to the projector 1 through the second transmission component 233, adjusting the posture of the projector 1 to ensure that it always remains horizontal, avoiding tilting or distortion of the projector 1 due to the swing of the linkage, thereby ensuring that the light output port 101 always faces the correct direction.

[0120] Power off and folded up: Conversely, when the device is powered off, the first motor 209 rotates in the opposite direction, causing the first connecting rod 203 to swing backward, retracting the projector 1 and folding it back onto the base 201. Similarly, the second motor 232 also plays a role in this process, ensuring that the projector 1 remains horizontal during the retraction process, ensuring that the device is stored stably and safely, and ready for the next use.

[0121] Therefore, this embodiment of the application achieves precise control of the attitude of the projection host 1 during the swinging process by adopting a dual-motor synchronous drive design.

[0122] In some embodiments, refer to Figure 14 and Figure 15As shown, the second transmission component 233 may include: a worm 235, a worm wheel 236, and a first connecting shaft 237. The worm 235 is connected to the output shaft of the second motor 232; the worm wheel 236 is meshed with the worm 235; and the first connecting shaft 237 is fixedly connected to the worm wheel 236 and the second end 206 of the first connecting rod 203, respectively.

[0123] The base 234 is provided with a motor mount 238 for fixing the second motor 232. The output shaft of the second motor 232 is connected to one end of the worm 235 via a coupling 239. The base 234 is also provided with first support seats 240 for supporting the two ends of the worm 235. Each first support seat 240 is provided with a first bearing 241, and the two ends of the worm 235 are respectively connected to the two first bearings 241. The base 234 is also provided with second support seats 242 for supporting the worm wheel 236. Each second support seat 242 is provided with a second bearing 243. A first connecting shaft 237 passes through the worm wheel 236 and the two second bearings 243. Optionally, the side of the worm wheel 236 is also provided with a limiting seat with a central opening. The limiting seat is divided into two halves. One half is the first limiting seat 244, which can be integrally formed on the side of the worm wheel 236. The other half is the second limiting seat 245, which can be locked onto the first limiting seat 244 by screws or other components. During assembly, the second limiting seat 245 is removed, the first connecting shaft 237 is passed through the first limiting seat 244 and the worm gear 236 is inserted, and then the second limiting seat 245 is locked onto the first limiting seat 244 to complete the fixed assembly of the first connecting shaft 237 and the worm gear 236.

[0124] Power transmission process: Since the worm gear 236 is fixed to the second end 206 of the first connecting rod 203 via the first connecting shaft 237, that is, the worm gear 236 is fixed relative to the second end 206 of the first connecting rod 203. Thus, when the second motor 232 starts, the worm 235 will rotate relative to the worm gear 236. The worm 235 is connected to the second motor 232, and the second motor 232 is connected to the projector 1 via the motor mount 238 and the base 234. In this way, the rotational torque of the worm 235 can be transmitted to the projector 1 through these components, thereby driving the projector 1 to rotate relative to the second end 206 of the first connecting rod 203, so that it can make fine adjustments during the swing of the first connecting rod 203 and maintain a horizontal posture.

[0125] Furthermore, due to the self-locking characteristic of the worm gear mechanism, once the projector 1 is adjusted to the target angle, it can stably maintain that position even without an additional locking mechanism. This self-locking characteristic not only enables smooth and precise angle adjustment but also effectively avoids vibration or instability during operation. Therefore, this technical solution, through the worm gear mechanism, allows the projector 1 to stably and precisely hover at different target projection positions, thereby achieving different projection ratios at different projection positions, meeting diverse user needs, and effectively improving the user experience.

[0126] Therefore, the embodiment of this application adopts a worm gear transmission design, which not only solves the problem of the projection host 1 maintaining a horizontal posture during the swinging process, but also significantly improves the stability and reliability of the system through its unique self-locking characteristics.

[0127] In some embodiments, refer to Figure 14 and Figure 15 As shown, the second drive mechanism 204 further includes a second detection component 246, which is disposed inside the projector host 1 and is used to detect the rotation angle of the projector host 1.

[0128] This application does not impose any particular limitation on the specific type of the second detection component 246, such as an encoder, photoelectric sensor, gyroscope, or other types of sensor. Its main function is to monitor the rotation angle of the projector 1 relative to the second end 206 of the first connecting rod 203 in real time and feed this information back to the controller. This data reflects the actual angle of the projector 1 relative to the horizontal plane, and the controller has a preset target angle value, which corresponds to the horizontal posture that the projector should maintain. The controller compares the deviation between the actual measured angle and the target angle, and then controls the rotation of the second motor 232 based on this deviation, causing the projector 1 to rotate to correct the angle deviation and ensure that the projector 1 maintains a horizontal posture during unfolding or folding.

[0129] As an example, such as Figure 14 and Figure 15As shown, the second detection component 246 includes a second sensing element 247 and a second photoelectric sensor 248. The second sensing element 247 can be connected to the end of the worm gear 235, and one or more second light-transmitting notches 249 are provided along the outer periphery of the second sensing element 247. The second photoelectric sensor 248 is fixed on the base 234 and is arranged opposite to the second sensing element 247. When the second motor 232 is started, it drives the worm gear 235 to rotate. Since the second sensing element 247 is connected to the worm gear 235, it rotates with the worm gear 235. As the second sensing element 247 rotates, the second light-transmitting notches 249 on it periodically pass through the second photoelectric sensor 248. Whenever the second light-transmitting notch 249 reaches the position of the second photoelectric sensor 248, light can pass through the second light-transmitting notch 249, causing the second photoelectric sensor 248 to receive a change in the light signal. The second photoelectric sensor 248 generates a pulse signal according to the light transmission status of the second light-transmitting notch 249 on the second sensing element 247, and each pulse represents a certain angle of rotation of the second sensing element 247. The controller calculates the actual rotation angle of the worm gear 235 based on these pulse signals, and then calculates the rotation angle of the projector host 1.

[0130] When the device is powered on, the first motor 209 and the second motor 232 start simultaneously. The first motor 209 drives the first linkage 203 to extend the projector 1 forward and adjusts the rotation angle of the first linkage 203 according to the feedback information of the first detection component 228. Meanwhile, the second motor 232 adjusts the rotation angle of the projector 1 according to the feedback information of the second detection component 246 to keep it in a horizontal position. Through the coordinated drive of the two motors, the projector 1 is ensured to accurately reach the target projection position in a horizontal position.

[0131] If the equipment suddenly loses power during operation, the following two methods can be used after power is restored:

[0132] Return to the initial zero point position: First, return the projector 1 to the power-off position on the base 201, and then re-expand according to the target projection position set by the user.

[0133] Continue exhibiting to the target position: directly extend to the target projection position based on the angle before the power outage.

[0134] Therefore, by employing the second detection component 246, this embodiment of the application can achieve precise angle control of the projector host 1, ensuring that the projector host 1 can maintain an ideal horizontal posture under various operating conditions.

[0135] In other embodiments, reference is made to Figures 16 to 19As shown, the second drive mechanism 204 includes: a first fixed wheel 250, a second connecting shaft 251, a second fixed wheel 252, and a second synchronous belt 253. The first fixed wheel 250 is fixed inside the base 201 and is coaxially arranged with the first end 205 of the first connecting rod 203. The second connecting shaft 251 passes through the second end 206 of the first connecting rod 203 and can rotate relative to the second end 206. One end of the second connecting shaft 251 is fixedly connected to the projection host 1. The second fixed wheel 252 is fixedly connected to the other end of the second connecting shaft 251 and corresponds to the first fixed wheel 250. The second synchronous belt 253 is wound around the first fixed wheel 250 and the second fixed wheel 252.

[0136] A fourth support plate 254 is provided on the base plate 207 of the base 201 to provide support. The fourth support plate 254 is located on the outer side of the first support plate 217 facing away from the driven wheel 213. The first fixed wheel 250 is fixed to the inner side of the fourth support plate 254 adjacent to the first connecting rod 203 and is coaxially spaced with the first rotating shaft 216 to avoid wear caused by relative movement. Its function is to serve as a fixed point to ensure that the second fixed wheel 252 and the projector 1 remain relatively stationary and do not rotate. The second connecting shaft 251 is connected to the second end 206 of the first connecting rod 203 through a third bearing 255. When the first connecting rod 203 swings, it can rotate relative to the second connecting shaft 251, while the second fixed wheel 252 and the projector 1, which are fixedly connected to the second connecting shaft 251, remain relatively stationary and do not rotate. Furthermore, there is a gap between the second fixed wheel 252 and the side of the first connecting rod 203. A bushing 256 is provided at this gap and is fitted onto the second connecting shaft 251 for protection.

[0137] Initially, the projector 1 is horizontally positioned. When the first motor 209 starts, it drives the drive wheel 212 to rotate, which in turn drives the driven wheel 213 to rotate via the first synchronous belt 214. This, in turn, causes the entire projector 1 to swing and rotate via the first connecting rod 203. During this process, the first fixed wheel 250 remains stationary, and the second fixed wheel 252, which is connected to it via the second synchronous belt 253, is also relatively stationary. However, the swinging of the first connecting rod 203 causes the second fixed wheel 252 and the second synchronous belt 253 to swing around the first fixed wheel 250. Since the second fixed wheel 252 itself is stationary, it is fixedly connected to the projector 1 via the second connecting shaft 251, making the projector 1 also stationary relative to the second fixed wheel 252. During the swinging of the first connecting rod 203, the first connecting rod 203 rotates relative to the second connecting shaft 251, that is, it rotates relative to the projector 1. Thus, even during the swinging of the first connecting rod 203, the projector 1 can maintain its horizontal posture, ensuring that the light output port 101 is always in the upper position.

[0138] It is understood that, unlike the aforementioned dual-motor drive embodiment, this embodiment uses a pulley drive source instead of the second motor 232 drive source. That is, a single motor is used to drive the projector 1 to rotate relative to the second end 206 of the first connecting rod 203, ensuring that the projector 1 maintains a horizontal posture throughout the swinging process. This achieves the swinging and posture adjustment of the projector 1 through a single power source (the first motor 209). This not only reduces the number of required motors but also simplifies the system's complexity and improves its reliability and maintainability.

[0139] In some embodiments, refer to Figure 17 , Figure 18 and Figure 21 As shown, the second drive mechanism 204 further includes a second tensioning component 257, which is disposed on the first connecting rod 203 and located between the first fixed wheel 250 and the second fixed wheel 252, for adjusting the tension of the second synchronous belt 253.

[0140] As an example, such as Figure 17 , Figure 18 and Figure 21 As shown, the first connecting rod 203 has a second slotted hole 258 facing the second synchronous belt 253; the second tensioning component 257 includes a first tensioning wheel 259 and a second tensioning wheel 260. The first tensioning wheel 259 has a first fixed shaft 261, which passes through the second slotted hole 258 and is locked by a tensioning nut 262. The first tensioning wheel 259 abuts against one side of the second synchronous belt 253, and the second tensioning wheel 260 is fixed to the first connecting rod 203 by the second fixed shaft 263 and abuts against the other side of the second synchronous belt 253, so as to separate the two sides of the second synchronous belt 253 and avoid mutual interference. When it is necessary to adjust the tension of the second synchronous belt 253, the tensioning nut 262 can be loosened first, and then the first tensioning wheel 259 can be moved closer to or away from the second synchronous belt 253 to make the second synchronous belt 253 reach a suitable tension. After the adjustment is completed, the tensioning nut 262 is tightened again.

[0141] In some embodiments, refer to Figures 16 to 18 As shown, a first protective cover 264 can be provided on the outside of the first connecting rod 203. The first protective cover 264 is used to cover the first fixed wheel 250, the second fixed wheel 252, the second synchronous belt 253 and the second tensioning component 257, etc., and a second protective cover 265 can also be provided on the outside of the second connecting rod 223 to achieve protection, ensure aesthetics, and extend the service life of the equipment.

[0142] In summary, the projection device provided in this application embodiment uses a first drive mechanism 202 to drive the linkage to swing and rotate the projector host 1, replacing the traditional linear telescopic movement design of the pan-tilt unit 2. This significantly shortens the length of the pan-tilt unit 2 in the front-to-back direction, thereby reducing its overall size. It also allows for a wide range of movement (long-distance projection) of the projector host 1 when it is powered on, while compactly folding it onto the base 201 and against the wall when powered off, effectively reducing the overall size when powered off and minimizing space occupation. This achieves a compact size and wall-hugging effect, reducing the risk of the projector host 1 being bumped or knocked. Furthermore, the second drive mechanism 204 ensures that the projector host 1 maintains a horizontal posture during the swinging process, guaranteeing the quality and stability of the projection. Simultaneously, the worm gear mechanism allows the projector host 1 to stably and accurately hover at different target projection positions when powered on, achieving different projection ratios to meet various user needs. In addition, the projection device of this application can achieve adaptive posture adjustment of the projector host 1 during the swinging and rotating process through dual-motor or single-motor drive methods, exhibiting stability and reliability.

[0143] The above are merely preferred embodiments of this application and are not intended to limit the embodiments of this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A projection device, characterized in that, include: Projector host; The gimbal includes: a base, a first drive mechanism, a first link, and a second drive mechanism. The first drive mechanism is disposed within the base. The first link has a first end and a second end. The first end is connected to the first drive mechanism, and the second end is provided with the projection host. The first drive mechanism is used to drive the first link to rotate, thereby causing the projection host to swing around the first end. The second drive mechanism is used to drive the projection host to rotate relative to the second end, so that the projection host always maintains a horizontal posture during the swinging process. The projection host has a power-off position and a power-on position. In the power-off position, the projection host is folded up on the base. In the power-on position, the projection host detaches from the base and extends to the target projection position.

2. The projection device according to claim 1, characterized in that, The second drive mechanism includes: The second motor is fixed inside the projector host; The second transmission component is located inside the projection host and is connected to the output shaft of the second motor and the second end, respectively. The second motor is used to drive the projection host to rotate relative to the second end via the second transmission component.

3. The projection device according to claim 2, characterized in that, The second transmission component includes: The worm gear is connected to the output shaft of the second motor; The worm gear meshes with the worm. The first connecting shaft is fixedly connected to the worm gear and the second end, respectively.

4. The projection device according to claim 2, characterized in that, The second drive mechanism also includes: The second detection component is located inside the projection host and is used to detect the rotation angle of the projection host.

5. The projection device according to claim 1, characterized in that, The second drive mechanism includes: The first fixed wheel is fixed inside the base and is coaxially arranged with the first end; A second connecting shaft passes through the second end and is rotatable relative to the second end, and one end of the second connecting shaft is fixedly connected to the projection host. The second fixed wheel is fixedly connected to the other end of the second connecting shaft and corresponds to the first fixed wheel; The second timing belt is wound around the first fixed pulley and the second fixed pulley.

6. The projection device according to claim 5, characterized in that, The second drive mechanism also includes: The second tensioning component is disposed on the first connecting rod and located between the first fixed wheel and the second fixed wheel, and is used to adjust the tension of the second timing belt.

7. The projection device according to any one of claims 1 to 6, characterized in that, The first driving mechanism includes: The first motor is fixed inside the base; A first transmission component is disposed within the base and is connected to the output shaft of the first motor and the first end, respectively. The first motor is used to drive the first connecting rod to rotate via the first transmission component.

8. The projection device according to claim 7, characterized in that, The first transmission component includes a driving wheel, a driven wheel, and a first synchronous belt wound around the driving wheel and the driven wheel. The driving wheel is connected to the output shaft of the first motor, and the driven wheel is connected to the first end. The first drive mechanism further includes a first tensioning component disposed within the base. The first tensioning component is connected to the first motor and is used to adjust the position of the first motor relative to the driven wheel, so as to adjust the tension of the first synchronous belt.

9. The projection device according to claim 7, characterized in that, The first drive mechanism further includes: The first detection component is located inside the base and is used to detect the rotation angle of the first connecting rod.

10. The projection device according to any one of claims 1 to 6, characterized in that, The gimbal also includes: The second link is distributed at intervals relative to the first link along the length of the base. The two ends of the second link are rotatably connected to the base and the projection host, respectively, and the second link can rotate synchronously with the first link.

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