A projection device

Abstract

The application relates to the field of projection technology and discloses a projection device for relieving the position change of a camera and a distance sensor caused by device vibration and temperature change. The projection device comprises a shell and a main body structure located in the shell. Specifically, the shell comprises a front shell, and the main body structure comprises a main support, an optical machine module, a camera, a distance sensor and a heat sink. The main support is fixed to the shell, the optical machine module, the camera and the distance sensor are all fixed to the main support, and the camera, the distance sensor and the lens of the optical machine module all face the front shell. The optical machine module is used for emitting a projection light beam towards a target object and forming image information on the surface of the target object, and the camera is used for collecting the image information on the surface of the target object; and the distance sensor is used for collecting distance information of the target object. The distance sensor is signal-connected with the camera so as to perform projection correction and focusing functions.

Description

Technical Field

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

[0002] With the rapid advancement of technology, 3D Time of Flight (ToF) technology, with its high precision and efficiency, combined with camera technology, plays a crucial role in keystone correction and focusing functions of high-end smart projectors. The collaborative work of 3D ToF technology and cameras in smart projectors primarily achieves projection correction (such as automatic keystone correction) and focusing functions through multimodal sensor data fusion and algorithm optimization. The working mechanism of distance sensors, such as 3D ToF sensors, involves emitting modulated infrared light pulses, recording the time difference between the light's emission and its reflection from the object, calculating the target distance using the speed of light, and constructing a depth map from the distance information of each pixel. This outputs point cloud data, which, combined with image information provided by the camera, is used to align the coordinate system through calibration parameters, generating a scene model with three-dimensional coordinates for geometric correction. Real-time image transformation and correction are achieved through deformation data acquisition, geometric transformation, and inverse compensation algorithms. This solution offers advantages such as low latency, high precision, and high environmental adaptability, effectively improving projection quality.

[0003] Generally, after the 3D ToF sensor and camera are calibrated, the relative positions of the combined structure and lens should not change, or the range of change should not exceed the corresponding standards. However, in practical applications, due to factors such as device vibration and temperature changes, the positions of the camera and 3D ToF sensor are prone to slight changes. These changes are difficult to control, and exceeding the limits may lead to a decrease in image acquisition and depth measurement accuracy, thus affecting the overall system performance and user experience. Therefore, designing a reliable structural fixing scheme to ensure stable alignment between the 3D ToF sensor and the camera is crucial for improving overall system performance and user experience. Utility Model Content

[0004] This application discloses a projection device for mitigating positional changes of the camera and distance sensor caused by device vibration and temperature variations.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A projection device, comprising:

[0007] The housing, including the front housing; and

[0008] The main structure includes:

[0009] The main support is fixed inside the housing;

[0010] An optical engine module, fixed to the main support, is used to project a beam of light toward a target object and form image information on the surface of the target object; the optical engine module includes a lens that protrudes from the main support toward the front shell.

[0011] A camera, fixed to the side of the main bracket facing the front shell, is used to collect the image information;

[0012] A distance sensor, fixed to the main bracket on the side facing the front shell and connected to the camera signal, is used to collect distance information of the target object; and

[0013] A heat sink is fixed to the main bracket and thermally connected to the distance sensor.

[0014] The projection device provided in this application includes a housing and a main structure located inside the housing. Specifically, the housing includes a front shell, and the main structure includes a main support, an optical engine module, a camera, a distance sensor, and a heat sink. The main support is fixed to the housing, and the optical engine module, camera, and distance sensor are all fixed to the main support, with the lenses of the camera, distance sensor, and optical engine module all facing the front shell. The optical engine module projects a projection beam toward the target object and forms image information on the surface of the target object; the camera acquires image information from the surface of the target object; and the distance sensor acquires distance information of the target object. The distance sensor is signal-connected to the camera for projection correction and focusing functions. This application ensures precise coordination and stable support between the camera, distance sensor, and optical engine module by fixing them to the same structure, i.e., the main support. Furthermore, the distance sensor is also thermally connected to a heat sink, increasing the heat dissipation area and dissipating the heat generated by the distance sensor, mitigating deformation of the main support due to heat, and thus reducing the positional changes between the camera, distance sensor, and optical engine module.

[0015] In some embodiments, the main support includes:

[0016] The first side plate is located on the side of the main bracket facing the front shell; and

[0017] Multiple first positioning posts protrude from the first side plate and are used to fix the distance sensor;

[0018] There is a gap between the distance sensor and the first side plate.

[0019] In some embodiments, the main support further includes a base plate, which is connected to the first side plate;

[0020] The front shell has a heat dissipation duct connecting the inside and outside of the shell on the side near the bottom plate.

[0021] In some embodiments, the front housing includes:

[0022] The front shell body is fixed to the main support; the front shell body is provided with a first hollow structure to form the heat dissipation air duct;

[0023] The decorative component is fixed to the front shell body on the side away from the main support, and the decorative component is provided with a second hollow structure; the second hollow structure is connected to the first hollow structure to form the heat dissipation duct.

[0024] In some embodiments, the decorative element includes:

[0025] Front-end plate, the front-end plate having a flow guiding area that completely covers the first hollow structure; and

[0026] An annular side plate surrounds the outer side of the front end plate; the annular side plate forms the second hollow structure on the side facing the bottom plate.

[0027] Wherein: the flow guiding area is provided with multiple flow guiding ribs; two adjacent flow guiding ribs cooperate with the front end plate to form a flow guiding groove; one end of the flow guiding groove opens towards the second hollow structure.

[0028] In some embodiments, an annular buffer is provided on the distance sensor and / or the camera; the annular buffer is used to buffer the force between the distance sensor and / or the camera and the front shell.

[0029] In some embodiments, the annular buffer includes a variable diameter section; the variable diameter section includes:

[0030] The first end faces the front shell; and

[0031] The second end faces the first side plate;

[0032] Wherein: the wall thickness of the first end is less than the wall thickness of the second end.

[0033] In some embodiments, the front shell body is provided with a first hollow window and a second hollow window, the first hollow window being configured corresponding to the camera, and the second hollow window being configured corresponding to the distance sensor;

[0034] The decorative component is fixed with a first light-transmitting protective component and a second light-transmitting protective component. The first light-transmitting protective component completely covers the first hollowed-out window, and the second light-transmitting protective component completely covers the second hollowed-out window.

[0035] In some embodiments, the first light-transmitting protective element and the second light-transmitting protective element are an integral structure.

[0036] In some embodiments, the distance sensor includes:

[0037] Transmitting module; and

[0038] The receiving module is arranged side by side with the transmitting module;

[0039] The second light-transmitting protective element includes:

[0040] The first light-transmitting part corresponds to the transmitting module;

[0041] The second light-transmitting part corresponds to the receiving module; and

[0042] The light-blocking part is located between the first light-transmitting part and the second light-transmitting part. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of a projection system provided in an embodiment of this application;

[0044] Figure 2 This is a schematic diagram of the structure of a projection device provided in an embodiment of this application;

[0045] Figure 3 This is a schematic diagram of the main structure of a projection device provided in an embodiment of this application;

[0046] Figure 4 An exploded view of the main structure of a projection device provided in an embodiment of this application;

[0047] Figure 5 This is a schematic diagram of the structure of the main support in a projection device provided in an embodiment of this application;

[0048] Figure 6 An enlarged view of the camera and distance sensor in a projection device provided in an embodiment of this application;

[0049] Figure 7 This is another structural schematic diagram of the main structure in a projection device provided in an embodiment of this application;

[0050] Figure 8 for Figure 7 A magnified view of the central camera and proximity sensor;

[0051] Figure 9 This application provides a schematic diagram of the heat dissipation duct structure on the front shell of a projection device.

[0052] Figure 10 An exploded view of the housing of a projection device provided in an embodiment of this application;

[0053] Figure 11This is a schematic diagram of the structure of the front shell in a projection device provided in an embodiment of this application;

[0054] Figure 12 An exploded view of the front shell of a projection device provided in an embodiment of this application;

[0055] Figure 13 A three-dimensional perspective view of a decorative component in a projection device provided in an embodiment of this application;

[0056] Figure 14 A schematic diagram of one side structure of a decorative component in a projection device provided in an embodiment of this application;

[0057] Figure 15 This is a schematic diagram of the other side structure of a decorative component in a projection device provided in an embodiment of this application;

[0058] Figure 16 This is a schematic diagram of the structure of a first annular buffer in a projection device provided in an embodiment of this application;

[0059] Figure 17 This is a schematic diagram of the structure of a second annular buffer in a projection device provided in an embodiment of this application;

[0060] Icons: 1-Projection device; 2-Projection screen; 100-Housing; 200-Main structure; 300-Gimbal; 110-Ring shell; 120-Front shell; 130-Rear shell; 111-Ring non-metallic shell; 112-Ring metallic shell; 121-Front shell body; 122-Decorative part; 123-Metal mesh cover; 124-First light-transmitting protective part; 125-Second light-transmitting protective part; 126-Adhesive backing; 131-Rear shell bracket; 210-Main bracket; 220-Fixing plate; 230-Optical engine module; 240-Camera; 250-Proximity sensor; 260-Heat sink; 270-Main circuit board; 280-Wireless board; 290-Adapter board; 211-First side plate; 212-Base plate; 213- Slide rail; 231-Lens; 232-Fan; 233-Heat sink; 241-First annular buffer; 251-Second annular buffer; 252-Transmitting module; 253-Receiving module; 281-First adapter cable; 282-Second adapter cable; 1210-First hollow structure; 1211-First hollow window; 1212-Second hollow window; 1220-Second hollow structure; 1221-Front end plate; 1222-Annular side plate; 1251-First light-transmitting part; 1252-Second light-transmitting part; 1253-Light-blocking part; 2411-Variable diameter section; 2511-Variable diameter section; 1221a-Guide rib; 1221b-Reinforcing rib; 2111-First positioning post; 2112-Second positioning post. Detailed Implementation

[0061] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships, for example, A and / or B can represent: A alone, A and B at the same time, and B alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0062] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0063] Figure 1 This is a schematic diagram of the structure of a projection system provided in an embodiment of this application.

[0064] like Figure 1 As shown, the projection system includes a projection device 1 and a projection screen 2. The projection screen 2 is located on the light-emitting side of the projection device 1. The audience faces the projection screen 2. The projection device 1 emits projection light, which enters the projection screen 2 and is reflected by the projection screen 2 before entering the viewer's eyes, thus allowing the viewer to see the projected image.

[0065] Most smart projectors on the market currently use cameras with Time-of-Flight (TOF) technology for autofocus and keystone correction. The specific structure involves the camera and distance sensor fixed to the outer casing, while the optical engine module is fixed to the internal structure of the casing. For small, lightweight products, the cumulative tolerance between the casing and the internal structure is small, resulting in a relatively stable system architecture and reducing the likelihood of correction failures. However, for large, heavy products, there are significant cumulative tolerances and the risk of thermal deformation between the casing and the internal structure, leading to an unstable system architecture.

[0066] In special circumstances, such as scratches on the exterior or returns within seven days without reason requiring the repackaging of the projection equipment, the outer shell may need to be replaced. After replacement, the relative displacement between the lens, camera, and distance sensor may exceed the algorithm's compensation range due to tolerance changes, directly affecting the actual calibration effect. If calibration failure occurs, the factory will have to take rework measures, such as recalibration, which will consume a lot of manpower and resources. For repackaging repairs in overseas markets, the product needs to be shipped back to China for processing, which is even more costly.

[0067] The calibration stability of smart projection devices is closely related to their structural design, weight, and size. Design flaws and after-sales issues such as repackaging and repair increase the risk of calibration failure, necessitating optimized design to reduce accumulated tolerances and improve system stability, thereby lowering after-sales service costs and return rates.

[0068] Based on the above application scenarios, this application provides a projection device in which the optical engine module, camera and distance sensor are all fixed on the internal structure, which can alleviate the positional changes of the camera and distance sensor caused by device vibration and temperature changes.

[0069] Figure 2 This is a schematic diagram of the structure of a projection device provided in an embodiment of this application; Figure 3 This is a schematic diagram of the main structure of a projection device provided in an embodiment of this application; Figure 4 An exploded view of the main structure of a projection device provided in an embodiment of this application.

[0070] like Figures 2 to 4 As shown, this application embodiment provides a projection device, including a housing 100 and a main structure 200; the housing 100 includes a front shell 120; the main structure 200 includes:

[0071] The main bracket 210 is fixed inside the housing 100;

[0072] The optical engine module 230 is fixed to the main support 210 and is used to project a beam of light toward the target object and form image information on the surface of the target object. The optical engine module 230 includes a lens 231, which protrudes from the main support 210 toward the front shell 120.

[0073] Camera 240 is fixed to the side of the main bracket 210 facing the front shell 120 and is used to collect image information;

[0074] A distance sensor 250 is fixed to the main bracket 210 on the side facing the front housing 120 and is connected to the camera 240 for signal acquisition of distance information of the target object; and

[0075] The heat sink 260 is fixed to the main bracket 210 and thermally connected to the distance sensor 250.

[0076] The projection device provided in this application embodiment includes a housing 100 and a main structure 200 located inside the housing 100. Specifically, the housing 100 includes a front shell 120, and the main structure 200 includes a main support 210, an optical engine module 230, a camera 240, a distance sensor 250, and a heat sink 260. The main support 210 is fixed to the housing 100, and the optical engine module 230, camera 240, and distance sensor 250 are all fixed to the main support 210, with the lenses 231 of the camera 240, distance sensor 250, and optical engine module 230 all facing the front shell 120. The optical engine module 230 emits a projection beam toward a target object and forms image information on the surface of the target object; the camera 240 collects image information from the surface of the target object; and the distance sensor 250 collects distance information from the target object. The distance sensor 250 is signal-connected to the camera 240 for projection correction and focusing functions. This embodiment of the application ensures precise coordination and stable support among the camera 240, distance sensor 250, and optical engine module 230 by fixing them to the same structure, namely the main support 210. Furthermore, the distance sensor 250 is thermally connected to a heat sink 260, increasing the heat dissipation area and dissipating the heat generated by the distance sensor 250. This alleviates the deformation of the main support 210 caused by heat, thereby reducing the amount of positional change among the camera 240, distance sensor 250, and optical engine module 230. For example, the heat sink 260 is made of aluminum, a material with good heat dissipation and low cost; that is, the heat sink 260 is an aluminum sheet.

[0077] Figure 5 This is a schematic diagram of the structure of the main support in a projection device provided in an embodiment of this application; Figure 6 An enlarged view of the camera and distance sensor in a projection device provided in an embodiment of this application; Figure 7 This is another structural schematic diagram of the main structure in a projection device provided in an embodiment of this application; Figure 8 for Figure 7 A magnified view of the central camera and proximity sensor.

[0078] In some embodiments, such as Figure 5 and Figure 6 As shown, the main support 210 includes a first side plate 211 and a plurality of first positioning posts 2111; the first side plate 211 is located on the side of the main support 210 facing the front shell 120; the plurality of first positioning posts 2111 protrude from the first side plate 211 and are used to fix the distance sensor 250.

[0079] There is a gap between the distance sensor 250 and the first side plate 211.

[0080] In one embodiment, such as Figure 5 As shown, the first side plate 211 is located on the side of the main bracket 210 facing the front shell 120 and serves as a support and fixing component. Multiple first positioning posts 2111 protrude from the first side plate 211 for precisely mounting and fixing the distance sensor 250. Multiple second positioning posts 2112 protrude from the first side plate 211 for precisely mounting and fixing the camera 240. The design of the first positioning posts 2111 and second positioning posts 2112 securely fixes the distance sensor 250 and camera 240 to the main bracket 210 while ensuring accurate positioning, thus supporting higher-precision distance measurement and image acquisition functions. The protruding positioning posts act as limiters, preventing the distance sensor 250 and camera 240 from shifting due to vibration or external force during operation. A certain gap is left between the distance sensor 250 and the first side plate 211; they are not completely fitted together. Similarly, a certain gap is also left between the camera 240 and the first side plate 211; they are not completely fitted together. A gap is maintained between the distance sensor and camera 240 and the first side plate 211 to facilitate airflow, create natural convection, and improve heat dissipation efficiency. Figure 6 As shown, the heat sink 260 is thermally connected to the distance sensor 250. A gap A is formed between the surface of the heat sink 260 facing away from the distance sensor 250 and the first side plate 211. This gap A is also used for wiring.

[0081] In one embodiment, such as Figure 7 and Figure 8 As shown, the projection device also includes a mounting plate 220, a main circuit board 270, a wireless board 280, and an adapter board 290. The mounting plate 220 is fixed to the main support 210. The main support 210 and the mounting plate 220 form the skeleton of the main structure 200. The mounting plate 220 is a metal plate, and the optical engine module 230 is fixed within the internal space formed by the main support 210 and the mounting plate 220. The optical engine module 230 includes an optical engine, a lens 231, a fan 232, and a heat sink 233. The mounting plate 220 is fixed to the main support 210 and protects the optical engine, while also reducing the deformation of the main support 210, making the overall structure more reliable. The main circuit board 270 is fixed to the mounting plate 220 on the side facing away from the optical engine. The mounting plate 220 serves as a fixing frame for the main circuit board 270, reducing the deformation of the main board, while the metal mounting plate 220 ensures that the circuit electromagnetic shielding (EMC) and electrostatic discharge (ESD) parameters meet the requirements. The wireless board 280 (WiFi board) is fixed to the main bracket 210 on the side facing the front shell 120, and the wireless board 280 is connected to the main circuit board 270 through the first adapter cable 281. Figure 6The gap A between the heat sink 260 and the first side plate 211 can serve as a routing channel for the first adapter cable 281. To further enhance the Wi-Fi signal, two external antennas are designed to be placed outside the housing 100, such as inside the gimbal 300. Two second adapter cables 282 are led out from the wireless board 280 and connected to the adapter board 290, so that the adapter board 290 can be connected to the external antennas outside the housing 100.

[0082] In this embodiment, the optical engine module 230, camera 240, and distance sensor 250 are fixed on the same main bracket 210, ensuring they all face the front housing 120. This improves the spatial consistency among these components and guarantees precise coordination of the projection beam, image acquisition, and distance measurement functions. Since all key components are fixed to the same stable structure, the main bracket 210, positional shifts caused by mechanical vibration or thermal expansion are reduced, thereby improving the stability of projection correction and focusing. The main bracket 210 is made of plastic reinforced with glass fiber. This plastic reinforced with glass fiber material typically refers to adding glass fiber to plastic to enhance its performance. This composite material has high strength, rigidity, and heat resistance.

[0083] The optical engine module 230, camera 240, and distance sensor 250 are all connected to the main circuit board 270 to implement projection correction (such as automatic keystone correction) and focusing functions. The distance sensor 250 is used to collect distance information of the target object and, through the main circuit board 270, links with the camera 240 to achieve automatic focus adjustment based on changes in the distance of the target object, thereby improving the clarity of the projected image. It also supports dynamic projection correction, enabling the projected image to be optimized in real time according to environmental conditions, such as compensating for uneven walls or projection angle shifts.

[0084] Taking the distance sensor 250 as a 3D TOF as an example, the optical engine module 230, the 3D TOF sensor, and the camera 240 are all fixed on a main bracket 210, achieving integrated fixation of the optical engine module 230, the 3D TOF sensor, and the camera 240. This ensures precise fit and stable support between the 3D TOF sensor / camera 240 module and other components of the camera body. This integrated base design effectively reduces the thermal expansion differences between components, improving system stability and accuracy. Simultaneously, the base is equipped with precise positioning holes and mounting slots to fix the 3D TOF sensor and camera 240, ensuring precise spatial alignment and that angular tolerances meet the required standards. The 3D TOF sensor and camera 240 are connected to the motherboard, and with the help of intelligent calibration algorithms, they can automatically detect and adjust various parameters of the camera 240, maintaining optimal imaging performance under various conditions.

[0085] Figure 9 This application provides a schematic diagram of the heat dissipation duct structure on the front shell of a projection device. Figure 10 An exploded view of the housing of a projection device provided in an embodiment of this application.

[0086] In some embodiments, such as Figure 9 and Figure 10 As shown, the main support 210 also includes a base plate 212, which is connected to the first side plate 211; the front shell 120 is provided with a heat dissipation duct connecting the inside and outside of the shell 100 on the side near the base plate 212.

[0087] like Figure 9 As shown, the main support 210 includes a base plate 212, which is connected to the first side plate 211. The base plate 212 serves as a support and connector, enhancing the overall structural stability of the main support 210. The front housing 120 is provided with a heat dissipation duct connecting the interior and exterior of the housing 100. The design of the heat dissipation duct provides an effective airflow channel inside the equipment.

[0088] The heat dissipation ducts are positioned near the base plate 212 of the main bracket 210, making full use of the internal space of the housing 100. This layout does not affect the installation of other functional modules and achieves reasonable heat dissipation in the structure. Through effective heat dissipation, the possibility of deformation of the main bracket 210 due to heat is reduced, ensuring the structural stability of the main bracket 210, thereby ensuring the precise coordination between the optical engine module 230, the camera 240, and the distance sensor 250.

[0089] In one embodiment, such as Figure 10 As shown, the housing 100 includes an annular shell 110, a front shell 120, and a rear shell 130. The annular shell 110 serves as the fixed foundation for the main structure 200. The main support 210 is slidably connected to the annular shell 110. Specifically, as... Figure 5As shown, the main support 210 is provided with a slide rail 213 that slides in conjunction with the annular shell 110. The front shell 120 and the rear shell 130 respectively cover the front and rear openings of the annular shell 110. It should be noted that the front and rear ends of the annular shell 110 are defined according to the projection direction of the entire projection device; the light-emitting side of the projection device is defined as the front end, and the corresponding other end is the rear end. The annular shell 110 includes an annular metal shell 112 and an annular non-metal shell 111. The annular metal shell 112 surrounds the outside of the main structure 200 along the front to rear direction, serving a protective and support function. The annular non-metal shell 111 is attached to the inner wall of the annular metal shell 112 to enhance the strength and stability of the shell 100. For example, the annular metal shell 112 is an aluminum shell, and the annular non-metal shell 111 is a plastic shell. The shell 100 of the projection device combines the advantages of aluminum and plastic, and has the advantages of high strength, good heat dissipation, lightweight and beautiful appearance, and easy processing. The front shell 120 includes a metal mesh cover 123, which is electrically connected to the annular metal shell 112. The metal mesh cover 123 serves as electromagnetic shielding and also provides ventilation and heat dissipation. The rear shell 130 also includes a rear shell bracket 131, which, exemplarily, is a plastic component used to support and fix the rear shell 130.

[0090] Figure 11 This is a schematic diagram of the structure of the front shell in a projection device provided in an embodiment of this application; Figure 12 An exploded view of the front shell of a projection device provided in an embodiment of this application; Figure 13 A three-dimensional perspective view of a decorative component in a projection device provided in an embodiment of this application; Figure 14 A schematic diagram of one side structure of a decorative component in a projection device provided in an embodiment of this application; Figure 15 This is a schematic diagram of the other side of a decorative component in a projection device provided in an embodiment of this application.

[0091] In some embodiments, such as Figures 11-13 As shown, the front shell 120 includes a front shell body 121 and a decorative piece 122;

[0092] The front shell body 121 is fixed to the main bracket 210; the front shell body 121 is provided with a first hollow structure 1210 to form a heat dissipation air duct.

[0093] Decorative component 122 is fixed to the front shell body 121 on the side away from the main support 210. A second hollow structure 1220 is provided on the decorative component 122. The second hollow structure 1220 is connected to the first hollow structure 1210 to form a heat dissipation channel.

[0094] like Figure 12As shown, the front shell 120 also includes a front shell body 121 and a decorative piece 122. The front shell body 121 is directly fixed to the main support 210 and is the main structural component; the decorative piece 122 is fixed to the side of the front shell body 121 away from the main support 210 and serves to enhance the appearance and provide auxiliary functions.

[0095] The first hollow structure 1210 is disposed on the front shell body 121 to form part of the heat dissipation duct; the second hollow structure 1220 is disposed on the decorative part 122 and communicates with the first hollow structure 1210 to form a complete heat dissipation channel. By splitting the heat dissipation duct into a combined structure of the front shell body 121 and the decorative part 122, good heat dissipation can be achieved without affecting the appearance of the equipment.

[0096] The first hollow structure 1210 is close to the main support 210, which is conducive to quickly dissipating the heat generated in the area of ​​the main support 210, such as the distance sensor 250 and the optomechanical module 230. The second hollow structure 1220 serves as an inlet, which guides cool air into the housing 100 smoothly under the action of the fan 232. After absorbing heat, the temperature rises, and the heated air is discharged through the annular shell 110 or the rear shell 130, thus avoiding the accumulation of heat inside the housing 100.

[0097] For example, the first hollow structure 1210 on the front shell body 121 can be designed as a structure with certain filtering or dustproof capabilities, such as a slender hole or a louver, which ensures ventilation and reduces the risk of dust entering the equipment.

[0098] In some embodiments, such as Figures 13-15 As shown, the decorative element 122 includes a front end plate 1221 and an annular side plate 1222 surrounding the outside of the front end plate 1221. The front end plate 1221 has a guide area that completely covers the first hollow structure 1210. The annular side plate 1222 forms a second hollow structure 1220 on the side facing the bottom plate 212.

[0099] Among them: the flow guiding area is provided with multiple flow guiding ribs 1221a; two adjacent flow guiding ribs 1221a cooperate with the front end plate 1221 to form a flow guiding groove; one end of the flow guiding groove opens towards the second hollow structure 1220.

[0100] In one embodiment, such as Figures 13-15 As shown, the decorative element 122 includes a front panel 1221 and an annular side panel 1222 surrounding the front panel 1221. The front panel 1221 covers the middle of the front shell body 121. The annular side panel 1222 surrounds the outside of the front panel 1221 and forms a second hollow structure 1220 on the side panel facing the bottom plate 212, so that the opening of the heat dissipation air duct faces the bottom of the projection device, forming an "invisible" opening, which is more aesthetically pleasing.

[0101] like Figures 12-15As shown, the front panel 1221 is provided with multiple reinforcing ribs 1221b and multiple airflow guide ribs 1221a. Along the top-to-bottom direction of the projection device, the multiple airflow guide ribs 1221a are located below the lens 231, camera 240, and distance sensor 250, while the multiple reinforcing ribs 1221b are located above the multiple airflow guide ribs 1221a, which can accelerate airflow. Two adjacent airflow guide ribs 1221a and the front panel 1221 together form an airflow channel. One end of the airflow channel opens towards the top of the projection device, and the other end opens towards the second hollow structure 1220, forming a clear airflow channel. The airflow channel guides the cool air entering from the second hollow structure 1220 to the interior of the front shell body 121, facilitating cooling of the interior of the shell 100.

[0102] Furthermore, the guide grooves formed by multiple guide ribs 1221a can effectively control the direction of hot air flow, prevent turbulence or eddy currents, and improve the efficiency and stability of the heat dissipation system.

[0103] The front panel 1221 of the decorative component 122 not only serves a shielding function but also enhances heat dissipation performance through the airflow guide ribs 1221a. This structural design balances aesthetics and functionality, avoiding the "cheap" feel of traditional heat dissipation holes. The design of the airflow guide ribs 1221a and the airflow channels can, to some extent, filter dust and reduce noise. For example, by adjusting the angle and density of the airflow guide ribs 1221a, the probability of dust entering the housing 100 can be reduced; it may also reduce wind noise generated when airflow passes through.

[0104] In some embodiments, such as Figure 6 As shown, a ring-shaped buffer is fitted onto the distance sensor 250 and / or the camera 240; the ring-shaped buffer is used to buffer the force between the distance sensor 250 and / or the camera 240 and the front shell 120.

[0105] In one embodiment, such as Figure 6 As shown, a first annular buffer 241 is fitted onto the camera 240, and a second annular buffer 251 is fitted onto the distance sensor 250. Both the first annular buffer 241 and the second annular buffer 251 are in soft contact with the front shell 120, serving as intermediate buffers.

[0106] It should be noted that the buffer is ring-shaped, meaning its shape is adapted to the form factor of the camera 240 or the proximity sensor 250. The ring-shaped buffer may be made of elastic materials such as rubber rings, silicone rings, or foam rings. When the device is subjected to external impact or vibration, the front housing 120 transmits the force to the ring-shaped buffer. The ring-shaped buffer absorbs and disperses the force, preventing it from acting directly on the sensor or camera 240 body.

[0107] The distance sensor 250 and camera 240 are high-precision optical components that are susceptible to mechanical shocks; the ring-shaped buffer can effectively absorb external vibrations and shocks, preventing damage or displacement of the components.

[0108] During assembly, the annular buffer can also fill the gap between the sensor / camera 240 and the front shell 120, absorb assembly errors, and ensure that the installation is stable without generating excessive stress.

[0109] If the annular buffer uses a good sealing material (such as silicone), it can also play a certain sealing role, preventing dust or moisture from entering the equipment through gaps.

[0110] Figure 16 This is a schematic diagram of the structure of a first annular buffer in a projection device provided in an embodiment of this application; Figure 17 This is a schematic diagram of the structure of a second annular buffer in a projection device provided in an embodiment of this application.

[0111] In some embodiments, such as Figure 16 and Figure 17 As shown, the annular buffer includes a variable diameter section; the variable diameter section includes a first end facing the front shell 120 and a second end facing the first side plate 211; wherein: the wall thickness of the first end is less than the wall thickness of the second end.

[0112] like Figure 16 and Figure 17 As shown, the first annular buffer 241 is not designed with a uniform wall thickness, but rather features a variable diameter section 241. Similarly, the second annular buffer 251 features a shell variable diameter section 2511. These variable diameter sections are used to achieve differences in mechanical properties in different directions. The first end of the variable diameter section faces the front shell 120 and has a thinner wall thickness; the second end faces the first side plate 211 and has a thicker wall thickness. This difference in wall thickness reflects the distinction in structural function. The design of the variable diameter section allows the buffer to have different buffering capacities and support strengths in different directions. Specifically, the first end is more flexible, facilitating the absorption of impacts transmitted from the front shell 120 direction; the second end is more robust, providing stable support.

[0113] The first end of the variable-diameter section has a thinner wall, making it more prone to deformation and thus better absorbing impact forces from the front shell in the 120° direction. The second end of the variable-diameter section has a thicker wall, which can resist shear forces or pressures applied from the side plates, maintaining structural stability.

[0114] When subjected to external forces, the variable diameter section can guide the stress to be reasonably distributed along the direction of thickness change, thus avoiding material fatigue or fracture caused by local stress concentration.

[0115] Furthermore, the thinner and more flexible first end allows for a better sealing contact surface during installation, helping to prevent dust or moisture from entering the equipment through gaps.

[0116] In some embodiments, such as Figure 12 As shown, the front shell body 121 is provided with a first hollow window 1211 and a second hollow window 1212. The first hollow window 1211 is set to correspond to the camera 240, and the second hollow window 1212 is set to correspond to the distance sensor 250.

[0117] The decorative component 122 is fixed with a first light-transmitting protective component 124 and a second light-transmitting protective component 125. The first light-transmitting protective component 124 completely covers the first hollow window 1211, and the second light-transmitting protective component 125 completely covers the second hollow window 1212.

[0118] In one embodiment, such as Figure 4 and Figure 12 As shown, the first cutout window 1211 is correspondingly set to the camera 240; the second cutout window 1212 is correspondingly set to the distance sensor 250; the two cutout windows are used to realize image acquisition and distance sensing functions, respectively. It should be noted that the two cutout windows may or may not be connected. Figure 4 The two cutout windows are separated by a dotted line, but in reality, they are connected. Alternatively, it can be understood as one large cutout window corresponding to both the camera 240 and the distance sensor 250, ensuring the realization of image acquisition and distance sensing functions.

[0119] The first light-transmitting protective element 124 covers the first hollowed-out window 1211, and the second light-transmitting protective element 125 covers the second hollowed-out window 1212. Furthermore, both the first light-transmitting protective element 124 and the second light-transmitting protective element 125 are made of transparent or semi-transparent material, so as not to affect the transmission of optical signals.

[0120] It is understandable that the fact that the light-transmitting protective component completely covers the perforated window indicates that the size of the light-transmitting protective component is larger than the corresponding perforated window, ensuring sealing and protection; the light-transmitting protective component may be made of materials such as glass, acrylic, or PC (polycarbonate).

[0121] In one embodiment, the front shell body 121 and the main support 210 are fixed with screws and positioned with positioning posts, ensuring omnidirectional locking between the front shell 120 and the main support 210. The first light-transmitting protective element 124 and the second light-transmitting protective element 125 are both adhered to the decorative element 122. The decorative element 122 is engaged with the front shell body 121 by positioning posts and snap-fit ​​mechanisms, ensuring a tight fit between the decorative element 122 and the front shell body 121. This ensures that the distance sensor 250, camera 240, front shell 120, main support 210, decorative element 122, and the two light-transmitting protective elements are tightly fixed with minimal cumulative tolerances, firmly securing all structural components together, resembling a single integrated structure, and ensuring the long-term stability of the overall structure.

[0122] The first light-transmitting protective element 124 and the second light-transmitting protective element 125 can be two independent structures or an integrated structure.

[0123] In some embodiments, the first light-transmitting protective element 124 and the second light-transmitting protective element 125 are an integral structure.

[0124] The light-transmitting protective components for the camera area 240 and the distance sensor area 250 are made of the same piece of material; the light-transmitting protective components are bonded to the decorative component 122 by adhesive 126, which improves the overall structural strength and assembly consistency.

[0125] In some embodiments, such as Figure 8 As shown, the distance sensor 250 includes a transmitting module 252 and a receiving module 253, with the receiving module 253 and the transmitting module 252 arranged side by side; the second light-transmitting protective component 125 includes a first light-transmitting part 1251, a second light-transmitting part 1252, and a light-blocking part 1253 located between the first light-transmitting part 1251 and the second light-transmitting part 1252, with the first light-transmitting part 1251 corresponding to the transmitting module 252; and the second light-transmitting part 1252 corresponding to the receiving module 253.

[0126] like Figure 8 As shown, the distance sensor 250 employs a separate design of a transmitting module 252 and a receiving module 253. The transmitting module 252 is used to emit detection signals such as infrared light; the receiving module 253 is used to receive signals reflected back from the target object and calculate the distance. Correspondingly, the second light-transmitting protective element 125 has a partitioned structure, including a first light-transmitting part 1251 corresponding to the transmitting module 252, a second light-transmitting part 1252 corresponding to the receiving module 253, and a light-blocking part 1253 located between the first light-transmitting part 1251 and the second light-transmitting part 1252. The light-blocking part 1253 is used to isolate the transmission and reception paths.

[0127] The light-blocking part 1253 prevents light emitted from the transmitting module 252 from directly entering the receiving module 253, avoiding optical crosstalk and improving ranging accuracy. The light-blocking part 1253 can be made of opaque plastic, metal, or a coated structure such as ink.

[0128] For example, the second light-transmitting protective member 125 forms a light-blocking portion 1253 by coating the middle with ink. The light-blocking portion 1253 divides the second light-transmitting protective member 125 into a first light-transmitting portion 1251 and a second light-transmitting portion 1252. The light-blocking portion 1253 can prevent the light from the transmitting module 252 from directly shining on the receiving module 253, avoiding measurement distortion; it can also improve the anti-interference capability and measurement accuracy of the distance sensor 250.

[0129] The projection device provided in this application embodiment can ensure the reliability of the system during long-term operation, and can also reduce the calibration parameters when the housing 100 is replaced, thus reducing the calibration cost when replacing the housing 100 in domestic repackaging. At the same time, it can ensure the reliability of foreign products, save the round-trip shipping costs and calibration fees required for replacing the housing 100 when repackaging export products, and greatly reduce market costs.

[0130] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this application without departing from the spirit and scope of this application. Therefore, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application also intends to include these modifications and variations.

Claims

1. A projection device, characterized in that, include: The housing, including the front housing; and The main structure includes: The main support is fixed inside the housing; An optical engine module, fixed to the main support, is used to project a beam of light toward a target object and form image information on the surface of the target object; the optical engine module includes a lens that protrudes from the main support toward the front shell. A camera, fixed to the side of the main bracket facing the front shell, is used to collect the image information; A distance sensor, fixed to the main bracket on the side facing the front shell and connected to the camera signal, is used to collect distance information of the target object; and A heat sink is fixed to the main bracket and thermally connected to the distance sensor.

2. The projection device according to claim 1, characterized in that, The main support includes: The first side plate is located on the side of the main bracket facing the front shell; and Multiple first positioning posts protrude from the first side plate and are used to fix the distance sensor; There is a gap between the distance sensor and the first side plate.

3. The projection device according to claim 2, characterized in that, The main support also includes a base plate, which is connected to the first side plate; The front shell has a heat dissipation duct connecting the inside and outside of the shell on the side near the bottom plate.

4. The projection device according to claim 3, characterized in that, The front shell includes: The front shell body is fixed to the main support; the front shell body is provided with a first hollow structure to form the heat dissipation air duct; The decorative component is fixed to the front shell body on the side away from the main support, and the decorative component is provided with a second hollow structure; the second hollow structure is connected to the first hollow structure to form the heat dissipation duct.

5. The projection device according to claim 4, characterized in that, The decorative element includes: Front-end plate, the front-end plate having a flow guiding area that completely covers the first hollow structure; and An annular side plate surrounds the outer side of the front end plate; the annular side plate forms the second hollow structure on the side facing the bottom plate. Wherein: the flow guiding area is provided with multiple flow guiding ribs; two adjacent flow guiding ribs cooperate with the front end plate to form a flow guiding groove; one end of the flow guiding groove opens towards the second hollow structure.

6. The projection device according to claim 2, characterized in that, The distance sensor and / or the camera are fitted with an annular buffer; the annular buffer is used to buffer the force between the distance sensor and / or the camera and the front shell.

7. The projection device according to claim 6, characterized in that, The annular buffer includes a variable diameter section; the variable diameter section includes: The first end faces the front shell; and The second end faces the first side plate; Wherein: the wall thickness of the first end is less than the wall thickness of the second end.

8. The projection device according to claim 4, characterized in that, The front shell body is provided with a first hollow window and a second hollow window. The first hollow window is set to correspond to the camera, and the second hollow window is set to correspond to the distance sensor. The decorative component is fixed with a first light-transmitting protective component and a second light-transmitting protective component. The first light-transmitting protective component completely covers the first hollowed-out window, and the second light-transmitting protective component completely covers the second hollowed-out window.

9. The projection device according to claim 8, characterized in that, The first light-transmitting protective component and the second light-transmitting protective component are an integral structure.

10. The projection device according to claim 8, characterized in that, The distance sensor includes: Transmitting module; and The receiving module is arranged side by side with the transmitting module; The second light-transmitting protective element includes: The first light-transmitting part corresponds to the transmitting module; The second light-transmitting part corresponds to the receiving module; and The light-blocking part is located between the first light-transmitting part and the second light-transmitting part.

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