Laser projection device

Abstract

The present application belongs to the field of projection display. Disclosed is a laser projection device. The laser projection device comprises: a housing, a rotating cover, a first driving assembly, a rotating sensing member, a detection member and a controller, wherein an optical engine is provided in the housing; the housing is provided with a light outlet which is configured to allow an image light beam emitted by the optical engine to be transmitted therethrough; the rotating cover is arranged at the light outlet; the first driving assembly is connected to the rotating cover and is configured to drive the rotating cover to rotate relative to the housing so as to expose or cover the light outlet; the rotating sensing member can rotate along with the rotating cover; the detection member is arranged corresponding to the rotating sensing member; the controller is electrically connected to the detection member and the first driving assembly; the rotating sensing member is configured to trigger the detection member during rotation along with the rotating cover so as to detect a rotation state of the rotating cover by means of the detection member; and the controller controls the start and stop of the first driving assembly according to a detection result of the detection member. The present application solves the problem of a laser projection device having relatively large seam openings after closure.

Description

Laser projection equipment

[0001] This application claims priority to Chinese patent application No. 202321611011.4 filed on June 21, 2023, with utility model name “Laser Projection Equipment”, and Chinese patent application No. 202311281296.4 filed on September 28, 2023, with invention name “Laser Projection Equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of projection display, and in particular to a laser projection device. Background Art

[0003] A laser TV includes a laser projection device and a projection screen. The laser projection device includes a housing and a lens located within the housing. The laser projection device emits an image beam through the lens toward the projection screen, which reflects the image beam to display the image. Because the laser projection device's lens is a precision component, a protective cover is required to protect the lens from scratches or dust. The protective cover automatically opens when the laser projection device is turned on, allowing the image beam emitted by the lens to be projected onto the projection screen. The protective cover automatically closes when the laser projection device is turned off, protecting the lens.

[0004] Summary of the Invention

[0005] The present application provides a laser projection device that can solve the problem of a large flash gap after the laser projection device is closed. The laser system includes: a shell, a rotating cover, a first drive assembly, a rotating sensor, a detection element, and a controller. An optical engine is provided in the shell, and a light outlet is provided on the shell for allowing the image light beam emitted by the optical engine to pass through. The rotating cover is provided at the light outlet. The first drive assembly is connected to the rotating cover and is used to drive the rotating cover to rotate relative to the shell to expose or cover the light outlet. The rotating sensor is connected to the first drive assembly in a transmission manner so that the rotating sensor rotates synchronously with the rotating cover. The detection element is correspondingly provided to the rotating sensor. The controller is electrically connected to the detection element and the first drive assembly. The rotating sensor is configured to trigger the detection element during the rotation of the rotating cover so as to detect the rotation state of the rotating cover through the detection element. The controller controls the start and stop of the first drive assembly according to the detection result of the detection element.

[0006] The laser projection device provided herein comprises an optical engine mounted within a housing, the housing being provided with a light outlet, so that an image beam emitted by the optical engine can be projected from the light outlet onto a projection screen. A rotating cover is disposed at the light outlet, and a first drive assembly is drivably connected to the rotating cover, enabling the rotating cover to rotate relative to the housing to expose the light outlet, thereby ensuring that the image beam from the optical engine can be projected onto the projection screen. The rotating cover is then driven to rotate relative to the housing to seal the light outlet, thereby effectively protecting the lens on the optical engine. The control unit can detect the rotation state of the rotary cover body by the detection unit during the rotation process, so that the rotation process of the rotary cover body can be continuously detected by the detection unit to ensure that the rotary cover body has rotated to the preset target position, thereby preventing the rotary cover body from not rotating into place or rotating excessively, resulting in a large gap at the rotary cover body, causing a large amount of dust to enter the shell and adhere to the lens surface, affecting the projection effect and image clarity of the lens; and the controller controls the start and stop of the first driving assembly according to the detection result of the detection unit, thereby controlling the static position of the rotary cover body, thereby preventing the first driving assembly from continuing to drive the rotary cover body to rotate after the rotary cover body rotates to the preset target position, resulting in excessive rotation of the rotary cover body, and also preventing the first driving assembly from continuing to drive the rotary cover body to rotate after the rotary cover body is rotated into place, resulting in other problems caused by continuous operation of the first driving assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0008] FIG1 is a schematic structural diagram of a laser projection device according to an embodiment of the present application;

[0009] FIG2 is a bottom view of a cover body in one embodiment of the present application;

[0010] FIG3 is a top view of a cover body in one embodiment of the present application;

[0011] FIG4 is a schematic structural diagram of an embodiment of the present application with the cover body without the second drive assembly;

[0012] FIG5 is a schematic structural diagram of a first drive assembly in one embodiment of the present application;

[0013] FIG6 is an exploded view of a rotating cover body according to an embodiment of the present application;

[0014] FIG7 is a schematic structural diagram of a lifting cover in one embodiment of the present application;

[0015] FIG8 is a schematic structural diagram of a second driving assembly from one perspective in one embodiment of the present application;

[0016] FIG9 is a schematic structural diagram of the second driving assembly from another perspective in one embodiment of the present application;

[0017] FIG10 is a schematic diagram of a partial structure of a second drive assembly in one embodiment of the present application;

[0018] FIG11 is a schematic structural diagram of a laser projection device in another embodiment of the present application;

[0019] FIG12 is a structural block diagram of a laser projection device in another embodiment of the present application;

[0020] FIG13 is a schematic diagram of a partial structure of a laser projection device in another embodiment of the present application;

[0021] FIG14 is a partial exploded schematic diagram of the structure shown in FIG13;

[0022] FIG15 is a schematic diagram of a partial structure of another laser projection device in another embodiment of the present application;

[0023] FIG16 is a schematic diagram of a portion of the structure shown in FIG15 ;

[0024] FIG17 is a schematic diagram of a partial structure of yet another laser projection device according to another embodiment of the present application;

[0025] FIG18 is a schematic diagram of a partial structure of yet another laser projection device according to another embodiment of the present application;

[0026] FIG19 is a schematic diagram showing the connection between a first transmission assembly and two rotating covers in another embodiment of the present application;

[0027] FIG20 is an exploded schematic diagram of a partial structure of a laser projection device according to another embodiment of the present application;

[0028] FIG21 is a schematic diagram showing the connection between a second transmission assembly and a housing in another embodiment of the present application;

[0029] FIG22 is a schematic diagram showing the connection between another second transmission assembly and the housing in another embodiment of the present application;

[0030] FIG23 is an exploded schematic diagram of a partial structure of a rotating cover and a lifting cover in another embodiment of the present application;

[0031] FIG24 is a schematic diagram of projection of a laser projection device in an embodiment of the present application;

[0032] FIG25 is a schematic diagram of the internal structure of an optical engine in an embodiment of the present application;

[0033] FIG26 is a schematic diagram of the assembly of the light source assembly, optical engine, and lens in an embodiment of the present application;

[0034] FIG27 is a schematic diagram of the optical path of the optical engine in an embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0036] Laser TVs are projection display devices that use laser light sources and front-projection display technology. They are equipped with a dedicated projection screen and can receive broadcast or internet-connected television programs. Laser projection TVs consist of a laser projection device and a projection screen. The laser projection device emits a laser beam toward the projection screen, which reflects the beam to display the image.

[0037] The projection screen can be an optical screen. Exemplarily, the projection screen can be composed of a support plate and a membrane positioned on the support plate. The membrane can be an optical membrane mainly composed of a Fresnel lens layer. For example, the membrane can include a diffusion layer, a substrate layer, and a Fresnel lens layer stacked in sequence in a direction away from the laser projection device (or, it can also include a substrate layer, a diffusion layer, and a Fresnel lens layer stacked in sequence); wherein the substrate layer is a transparent film layer. When displaying an image, a light beam is emitted from the laser projection device. When passing through the diffusion layer, the light is dispersed by the diffusion layer and then reflected on the surface of the Fresnel lens layer, thereby allowing the user to view the image. Exemplarily, the support plate can be bonded to the membrane via an adhesive layer to achieve fixation and flattening of the membrane. The adhesive layer can be a double-sided adhesive layer or a glue layer.

[0038] Since the lens of the laser projection device is a precision component, in order to prevent the lens inside the laser projection device from being scratched by external forces or falling into dust, a protective shell is required to protect the lens. The protective cover automatically opens when the laser TV is turned on and used, so that the image beam emitted by the lens is projected onto the projection screen. It automatically closes when the laser TV is turned off to protect the lens. The protective shell of the laser projection device usually includes a light-transmitting part and a shielding part. The light-transmitting part is used to allow the image beam to pass through, and the shielding part is used to shield the protective lens. When the expected shielding part of the protective cover is not rotated into place during use, it will cause a flash seam problem at the lens. The protective shell of the existing laser projection device is a circular structure, which can be a complete circular shell structure or a circular shell structure formed by splicing multiple cover bodies. Since the multiple cover bodies involve many structural parts, it is easy to make the cumulative processing error large, and the consistency after assembly is insufficient, resulting in a flash seam problem in the protective shell. Moreover, if the gaps between the multiple covers are too large, the flash gap problem will become more serious, causing a large amount of dust to enter the shell and adhere to the lens surface, affecting the projection effect and image clarity of the lens. In addition, there is a lot of dust and debris attached to the lens. When cleaning the lens, the dust and debris rub back and forth, forming a large number of scratches on the lens, affecting the projection effect and service life of the lens.

[0039] Based on this, some embodiments of the present application provide a laser projection device, which is described in detail below through specific embodiments:

[0040] 1 to 23 , in this embodiment, the laser projection device includes: a housing 100, a rotating cover 2, a first drive assembly 4, a rotational sensing element 51, a detection element 5, and a controller. An optical engine is disposed in the housing 100, and a light outlet 101 is disposed on the housing 100 for allowing an image beam emitted by the optical engine to pass through. The rotating cover 2 is disposed at the light outlet 101. The first drive assembly 4 is connected to the rotating cover 2 and is configured to drive the rotating cover 2 to rotate relative to the housing 100 to expose or cover the light outlet 101. The rotational sensing element 51 is transmission-connected to the first drive assembly 4 so that the rotational sensing element 51 rotates synchronously with the rotating cover 2. The detection element 5 is disposed correspondingly to the rotational sensing element 51. The controller is electrically connected to the detection element 5 and the first drive assembly 4. The rotational sensing element 51 is configured to trigger the detection element 5 during the rotation of the rotating cover 2 so as to detect the rotation state of the rotating cover 2 through the detection element 5. The controller controls the start and stop of the first drive assembly 4 according to the detection result of the detection element 5.

[0041] The transmission connection between the rotating sensing member 51 and the first driving assembly 4 refers to a connection method that can directly or indirectly transmit the power of the first driving assembly 4 to the rotating sensing member 51 so that the rotating sensing member 51 can rotate synchronously with the rotating cover body 2.

[0042] The laser projection device provided in this application is characterized by installing an optical engine within a housing 100, which is provided with a light outlet 101, so that the image beam emitted by the optical engine can be projected from the light outlet 101 to a projection screen. A rotating cover 2 is disposed at the light outlet 101, and a first drive assembly 4 is drivingly connected to the rotating cover 2, so that the rotating cover 2 can rotate relative to the housing 100 to expose the light outlet 101, thereby ensuring that the image beam of the optical engine can be projected onto the projection screen; and the rotating cover 2 is driven to rotate relative to the housing 100 to cover the light outlet 101, thereby effectively protecting the lens on the optical engine. The rotation sensing member 51 can rotate along with the rotating cover body 2 under the drive of the first driving component 4, so that the rotation sensing member 51 reflects the rotation state of the rotating cover body 2. The rotation sensing member 51 is configured to trigger the detection member 5 during the rotation process to detect the rotation state of the rotating cover body 2 through the detection member 5, so that the rotation process of the rotating cover body 2 can be continuously detected by the detection member 5 to ensure whether the rotating cover body 2 is rotated to the preset target position, and prevent the rotating cover body 2 from not rotating into place or rotating excessively, resulting in a large gap at the rotating cover body 2, so that a large amount of dust enters the shell 100 and adheres to the lens surface, affecting the projection effect and image clarity of the lens; and the controller controls the start and stop of the first driving component 4 according to the detection result of the detection member 5, thereby controlling the static position of the rotating cover body 2, and preventing the first driving component 4 from continuing to drive the rotating cover body 2 to rotate after the rotating cover body 2 rotates to the preset target position, resulting in excessive rotation of the rotating cover body 2, and can also prevent the first driving component 4 from continuing to drive the rotating cover body 2 to rotate after the rotating cover body 2 is rotated into place, resulting in other problems caused by the continuous operation of the first driving component 4.

[0043] Regarding the manner in which the rotating cover 2 exposes or covers the light outlet 101, in some embodiments, the detection member 5 detects the rotation angle of the rotating cover 2, thereby controlling the start and stop of the first drive assembly 4, and further controlling the rotation of the rotating cover 2. In some embodiments, the detection member 5 detects the rotation position of the rotating cover 2, thereby controlling the start and stop of the first drive assembly 4, and further controlling the rotation of the rotating cover 2. The manner in which the rotating cover 2 exposes or covers the light outlet 101 is described below.

[0044] 1 to 10 , in some embodiments, the detection member 5 includes a rotation sensor. During the rotation of the rotation sensing member 51, one end of the rotation sensing member 51 in the rotation direction can contact the rotation sensor to trigger the rotation sensor. The rotation sensing member 51 continues to contact the rotation sensor until the other end of the rotation sensing member 51 in the rotation direction leaves the rotation sensor.

[0045] In a specific implementation, the rotating sensing part 51 can have an arc-shaped outer contour surface, that is, the edge of the rotating sensing part 51 is arc-shaped. During the rotation of the rotating sensing part 51, the outer contour surface is always in contact with the rotation sensor to ensure that the rotation sensor can continuously detect the rotation angle of the rotating sensing part 51.

[0046] It should be noted that the specific curvature of the outer contour surface of the rotating sensing part 51 can be set accordingly according to the need to detect the rotation angle of the rotating cover body 2. For example, the rotating sensing part 51 can be set to a semicircular or 1 / 4 fan-shaped structure, and the specific setting position of the rotation sensor can also be adapted and set accordingly according to the rotating sensing part 51. It is sufficient to ensure that the rotating sensing part 51 can continuously trigger the rotation sensor as the rotating cover body 2 rotates, so that the rotation sensor can continuously detect the rotation angle of the rotating cover body 2.

[0047] Of course, the rotating sensing component 51 is not limited to having an arc-shaped outer contour surface, that is, the surface of the rotating sensing component 51 used to contact the rotation sensor is not limited to a circular arc surface. It is sufficient as long as the rotating sensing component 51 can contact the rotation sensor when it rotates to a certain position, and maintain contact with the rotation sensor for a certain period of time during the rotation process, and then separate from the rotation sensor and no longer contact it.

[0048] There are two rotation sensors, namely a first rotation sensor 52 and a second rotation sensor 53. The first rotation sensor 52 and the second rotation sensor 53 are spaced apart and electrically connected to the controller. When the rotation sensing member 51 rotates, the first rotation sensor 52 and the second rotation sensor 53 are triggered in sequence, thereby controlling the rotational position of the rotation sensing member 51 and the rotating cover 2 through the first rotation sensor 52 and the second rotation sensor 53. Specifically, during the rotation of the rotation sensing member 51, when the end of the outer contour surface located at the front end in the rotation direction contacts one of the first rotation sensor 52 and the second rotation sensor 53, the end of the outer contour surface located at the rear end in the rotation direction leaves the other of the first rotation sensor 52 and the second rotation sensor 53.

[0049] In some embodiments, as shown in Figures 2 to 5, the laser projection device further includes a lifting cover 1. To enhance the aesthetics of the laser projection device, the lifting cover 1 and the rotating cover 2 are both disposed at the light outlet 101. The number of rotating covers 2 can be one, two, or three, and the first drive assembly 4 drives the plurality of rotating covers 2 to rotate relative to the lifting cover 1 to expose or block the light outlet 101.

[0050] In addition, the laser projection device further includes a second drive assembly 3, which is disposed within the housing 100 and connected to the lifting cover 1. The second drive assembly 3 is used to drive the lifting cover 1 to move relative to the housing 100 in the direction of the image beam transmitted through the light outlet 101 or in the opposite direction of the image beam to move away from or closer to the light outlet 101, thereby exposing or shielding the light outlet 101. The first drive assembly 4 is used to drive the rotating cover 2 to rotate to the interior of the lifting cover 1 to expose the light outlet 101, or to drive the rotating cover 2 to rotate out from the interior of the lifting cover 1 to cover the light outlet 101, when the lifting cover 1 moves to a preset position relative to the housing 100 in the direction of the image beam transmitted through the light outlet 101.

[0051] In some embodiments, as shown in Figure 1, there is one rotating cover body 2, the lifting cover body 1 and the rotating cover body 2 are both semicircular structures, and the lifting cover body 1 and the rotating cover body 2 are assembled together into a circular cover structure to shield and protect the light outlet 101.

[0052] The first driving assembly 4 is disposed in the housing 100 and connected to the rotating cover body 2, and is used to drive the rotating cover body 2 to rotate relative to the housing 100 in a first direction and rotate to the inside of the lifting cover body 1 to expose the light outlet 101, so that the image light beam of the optical engine can be transmitted to the projection screen through the light outlet 101, and to drive the rotating cover body 2 to rotate relative to the housing 100 in the opposite direction of the first direction and rotate out from the inside of the lifting cover body 1 to cover the light outlet 101, so as to prevent the lens in the light outlet 101 from being scratched by external force or adhering to a large amount of dust.

[0053] In addition, the rotating cover body 2 is an integrated semicircular structure as a whole, which greatly reduces the cumulative processing error of the rotating cover body 2, reduces the probability of large flash gaps caused by the large cumulative tolerance of the fitting due to the large number of structural parts of the rotating cover body 2, and improves the adaptability of the assembly between the lifting cover body 1 and the rotating cover body 2. After the lifting cover body 1 and the rotating cover body 2 are assembled together, a circular cover structure that is compatible with the light outlet 101 can be formed, making the appearance of the entire cover body more complete and smoother and more beautiful, and solves the problem that when there are multiple rotating cover bodies 2, there are many structural parts involved, the cumulative processing error is large, resulting in insufficient consistency between the rotating cover body 2 and the lifting cover body 1 after assembly, resulting in flash gaps between the rotating cover body 2 and the lifting cover body 1.

[0054] In some embodiments, as shown in Figures 2 to 5, the first drive assembly 4 includes a first motor 41 and a gear set 42 that is transmission-connected to the first motor 41. A rotary bearing 20 is provided on the rotary cover 2, and the gear set 42 is cooperatively connected to the rotary bearing 20. The first motor 41 drives the rotary cover 2 to rotate through the gear set 42, so as to rotate the rotary cover 2 relative to the housing 100 in a first direction and rotate it to the interior of the lifting cover 1 to expose the light outlet 101, and to rotate the rotary cover 2 relative to the housing 100 in the opposite direction of the first direction and rotate it out of the interior of the lifting cover 1 to cover the light outlet 101.

[0055] In some embodiments, the gear set 42 may include two or more gears meshing with each other. When the gear set 42 includes two meshing gears, one of the gears is drivingly connected to the output shaft of the first motor 41, and the other gear is connected to the rotating cover body 2. The first motor 41 drives the two gears to achieve the rotation of the rotating cover body 2. As shown in Figure 2, in some embodiments, the gear set 42 includes a first gear 421, a second gear 422, and a third gear 423 meshing with each other in sequence. The first gear 421 is connected to the output shaft of the first motor 41, the second gear 422 is meshed with the first gear 421 and the third gear 423 respectively, and the third gear 423 is cooperatively connected to the rotating bearing 20. The diameter of the first gear 421 is small, so that the driving force of the first motor 41 to drive the first gear 421 to rotate is small, which can reduce the energy consumption of the first motor 41 to a certain extent. The sizes of the second gear 422 and the third gear 423 are increased gradually, which can increase the driving force of the first motor 41 to a certain extent, so that the first motor 41 only needs to drive the first gear 421 with a smaller size to drive the meshing rotation of the second gear 422 and the third gear 423 to achieve the rotation of the rotating cover body 2, so that the operation stability and reliability of the rotating cover body 2 are higher, and the operation noise is lower, and the laser projection device automatically turns on when it is turned on and automatically turns off when the laser projection device is turned off.

[0056] It should be noted that the above-mentioned definition of the first drive assembly 4 is merely an exemplary configuration and does not constitute a limitation on the scope of protection of this application. In actual applications, the first drive assembly 4 may also achieve rotation of the rotatable cover 2 through other transmission mechanisms. For example, the first drive assembly 4 may further include a motor and a connecting rod mechanism connected to the motor, the connecting rod mechanism may include a plurality of connecting rods hingedly connected to each other, the connecting rod mechanism may be connected to the rotatable cover 2, and the rotation of the rotatable cover 2 may also be achieved by the motor driving the connecting rod mechanism.

[0057] In some embodiments, referring to Figure 4, specifically, the rotating sensing part 51 is a sheet-like or plate-like structure, and the rotating sensing part 51 is fan-shaped as a whole. For example, the rotating sensing part 51 can be a 1 / 4 fan-shaped structure, and the center of the fan-shaped structure is connected to the rotation center of the gear set 42 so that the fan-shaped structure can rotate around the rotation center of the gear set 42; the arc-shaped outer contour surface of the fan-shaped structure contacts the detection part 5 during the rotation of the rotating sensing part 51 to trigger the detection part 5.

[0058] Specifically, the rotation sensing element 51 has a first end and a second end located at both ends of the fan-shaped structure. The rotation sensing element 51 is fixed to the second gear 422, and the first rotation sensor 52 and the second rotation sensor 53 are respectively located on either side of the second gear 422. The rotation sensing element 51 rotates along the rotation path as the rotating cover 2 rotates. The first rotation sensor 52 and the second rotation sensor 53 are respectively arranged on both sides of the rotation sensing element 51 and along the rotation path. When the rotation sensing element 51 rotates, one end triggers one of the sensors and rotates along the sensor. When the end leaves the sensor, the other end can immediately trigger the other sensor and rotate along the other sensor, thereby ensuring that the rotation sensing element rotates to the target position within one rotation cycle. In other words, when the end of the rotation sensing element 51 located at the front end of the rotation direction triggers one of the first rotation sensor 52 and the second rotation sensor 53 during the rotation process, the end located at the rear end of the rotation direction leaves the other of the first rotation sensor 52 and the second rotation sensor 53.

[0059] Specifically, after the lifting cover 1 completes the lifting action, the rotating cover 2 rotates in the first direction (i.e., the horizontal direction) under the drive of the first motor 41. The rotating cover 2 can rotate in the clockwise or counterclockwise direction to the inside of the lifting cover 1. Since the rotating sensing member 51 is a quarter-circular structure, the angle between the two ends of the rotating sensing member 51 is 90 degrees. As shown in Figure 5, when the rotating sensing member 51 rotates, one end of the rotating sensing member can trigger the first rotation sensor 52 and continue to rotate along the first rotation sensor 52. At this time, the signal of the first rotation sensor 52 changes from ON to maintain 90 degrees until the end leaves the first rotation sensor 52. At this time, the other end of the rotating sensing member 51 directly enters the second rotation sensor 53 and triggers the second rotation sensor 53. At this time, the signal of the first rotation sensor 52 changes to OFF, the signal of the second rotation sensor 53 changes to ON, and the rotating sensing member 51 continues to rotate along the second rotation sensor 53 until the other end of the rotating sensing member 51 leaves the second rotation sensor 53. At this time, the signal of the second rotation sensor 53 changes from maintain 90 degrees to OFF. Through the triggering rotation process of the above-mentioned rotation sensing member 51 and the first rotation sensor 52 and the second rotation sensor 53, it can be confirmed that the first motor 41 drives the rotating cover body 2 to rotate substantially 180°, so that the rotating cover body 2 can rotate along the first direction to the inside of the lifting cover body 1, basically overlapping with the lifting cover body 1, to expose the light outlet 101, and realize the normal projection function of the laser projection device. By setting the first rotation sensor 52 and the second rotation sensor 53 on both sides of the rotation sensing member 51, it is possible to more accurately calculate whether the rotation sensing member 51 has indeed rotated 180°. If only one sensor is set for detection, its detection error is large and in some cases, when the rotation sensing member 51 has not yet rotated to the correct position, the sensor signal may directly change from ON to OFF. Compared with using only one sensor to detect whether it has rotated to the correct position, the accuracy of the detection of two sensors in this embodiment is higher.

[0060] It should be noted that, since there will inevitably be some errors in the respective processing and assembly stages of the lifting cover body 1 and the rotating cover body 2, there will be a flash gap problem between the lifting cover body 1 and the rotating cover body 2 after the two are assembled at the factory stage. Therefore, in the factory debugging stage, only when the above-mentioned first rotation sensor 52 and the second rotation sensor 53 both detect that the rotating sensing member 51 has rotated 90°, it is determined that the rotating cover body 2 has indeed rotated into place, and then the debugging personnel manually observe and detect whether there is a flash gap problem between the lifting cover body 1 and the rotating cover body 2. At this time, if the debugging personnel detect that the gap between the lifting cover body 1 and the rotating cover body 2 is flush, it proves that there is no flash gap problem between the lifting cover body 1 and the rotating cover body 2, and this is an ideal assembly process between the lifting cover body 1 and the rotating cover body 2. If the commissioning personnel detects that there is a significant angle between the lifting cover 1 and the rotating cover 2 or that the gap between the two is not flush, it indicates that there is a gap between the lifting cover 1 and the rotating cover 2, which will cause a large amount of dust to enter the housing 100 through the gap between the two covers and adhere to the lens surface, affecting the projection effect and image clarity of the lens. In addition, dust adhering to the lens is likely to scratch the lens. In this case, the commissioning personnel need to continue to drive the rotating cover 2 to rotate according to the location of the gap, thereby solving the gap problem between the lifting cover 1 and the rotating cover 2.

[0061] Specifically, the first motor 41 first drives the gear set 42 to drive the rotating cover body 2 to rotate, and the rotating sensing member 51 triggers the first rotation sensor 52 and the second rotation sensor 53 in sequence when rotating, until the rotating sensing member 51 rotates 180 degrees. At this time, after confirming that the rotating cover body 2 has been driven to rotate to 180 degrees, the debugging personnel observe and detect the lifting cover body 1 and the rotating cover body 2, and find that the rotating cover body 2 is not completely spliced ​​with the lifting cover body 1. If the gap between the left side of the rotating cover body 2 and the lifting cover body 1 is large, the debugging personnel can control the first motor 41 by debugging the remote control to drive the rotating cover body 2 to rotate a certain angle to the left. For example, 1°, 2°, or 3°, until the rotating cover body 2 rotates to the right relative to the lifting cover body 1. If the gap between the right side of the rotating cover body 2 and the lifting cover body 1 is large, the debugging personnel can control the first motor 41 to drive the rotating cover body 2 to rotate to the right by a certain angle, such as 1°, 2°, or 3°, by debugging the remote control, until the rotating cover body 2 rotates to the right relative to the lifting cover body 1. At this time, the gap between the lifting cover body 1 and the rotating cover body 2 is small. The data of the rotation angle of the rotating cover body 2 is directly saved by debugging the remote control. The next time the rotating cover body 2 is rotated, the rotation angle maintained this time can be directly run to achieve the rotation of the rotating cover body 2 to the right. It should be noted that the specific rotation angle of each rotating cover body 2 that has completed debugging is different. For example, some rotating cover bodies 2 only need to rotate 178° to rotate to the right, while some rotating cover bodies 2 need to rotate 182° to rotate to the right.

[0062] In a specific application, there are two adjustment methods for the gap problem between the lifting cover body 1 and the rotating cover body 2. The first adjustment method is to turn on the first rotation sensor 52 and the second rotation sensor 53, and first drive the gear set 42 by the first motor 41 to drive the rotating cover 2 to rotate, so that the rotation sensing member 51 triggers the first rotation sensor 52 and the second rotation sensor 53 in sequence until the rotating sensing member 51 rotates 180°. Then, according to the rotation debugging program saved by the laser projection device last time, the rotating sensing member 51 is driven to continue to rotate a certain degree or reverse a certain degree until the rotating cover 2 is determined to be in the final state, ensuring that the rotating cover 2 is rotated to the right position with a small gap; the second debugging method is to directly drive the rotating cover 2 to rotate according to the final rotation angle by the first motor 41 according to the rotation debugging program saved by the laser projection device last time, for example, directly drive the rotating cover 2 to rotate 178° or 182° as needed to rotate the rotating cover 2 into place at one time, and in this debugging method, only the rotation sensor at the starting position is turned on, that is, the rotation sensing member 51 only needs to trigger the rotation sensor at the starting position to ensure that the rotating sensing member 51 also rotates with the gear set 42.

[0063] Both of the above-mentioned adjustment methods can ensure that the rotating cover body 2 rotates into place relative to the lifting cover body 1, and reduce the gap between the lifting cover body 1 and the rotating cover body 2 as much as possible, ensuring that the lifting cover body 1 and the rotating cover body 2 are more compatible, and the step difference between the lifting cover body 1 and the rotating cover body 2 is also within a reasonable range, so that there is no problem of large gap (horizontal direction) and step difference (vertical direction) between the lifting cover body 1 and the rotating cover body 2. It should be noted that since only one rotation sensor is turned on in the second adjustment method, it is impossible to accurately detect the rotation angle of the rotating sensing member 51 to a certain extent, resulting in poor accuracy of this adjustment method. The second adjustment method is to first ensure that the rotating sensing member 51 rotates 180° through two rotation sensors, and then continue to detect the second rotation of the rotating sensing member 51, so that the rotating sensing member 51 can always be under the trigger detection of the rotation sensor, ensuring the rotation accuracy of the rotating sensing member 51, so that the accuracy of the first adjustment method is better than that of the second adjustment method.

[0064] It should be noted that, in actual application, the detection member 5 can also be configured as other detection components. For example, the detection member 5 can also include only a sensor and a rotation sensing member, the rotation sensing member is disposed on the rotating cover 2, and the sensor is disposed along the rotation path of the rotation sensing member, so that the rotation sensing member can always trigger the sensor as the rotating cover 2 rotates. When the sensor detects that the rotation sensing member has rotated a preset angle, the first motor 41 is controlled to stop.

[0065] In some embodiments, as shown in Figure 6, the rotating cover body 2 includes a first mounting plate 22 and a first cover plate 21 attached to the first mounting plate 22. The first drive assembly 4 is connected to the first mounting plate 22. For example, the rotating bearing 20 is fixed on the first mounting plate 22. A plurality of support gaskets 23 are arranged between the first cover plate 21 and the first mounting plate 22. During assembly, the production line uses a tool-feeler gauge to determine the flash seam and step difference specifications, so as to adjust the height of the first cover plate 21 relative to the lifting cover body 1 and the parallelism of the first cover plate 21 relative to the first direction through the plurality of support gaskets 23. That is, the relative height and parallelism of the first cover plate 21 are adjusted by the plurality of support gaskets 23 to reduce the step difference problem caused by the cumulative error of the structural parts.

[0066] In some embodiments, as shown in FIG. 7 , the laser projection device further includes a mounting base 6 located within the housing 100. The mounting base 6 includes a mounting plate and a mounting bracket located on the mounting plate. The mounting plate is used to mount the first drive assembly 4, and the mounting bracket is used to mount the first drive assembly 4. By connecting the second drive assembly 3 and the first drive assembly 4 to the lifting cover 1 and the rotating cover 2, respectively, the movement of the two covers can be driven independently, resulting in a stable structure and easy installation and maintenance.

[0067] In some embodiments, the laser projection device further includes a first photoelectric switch 71 and a second photoelectric switch 72, both of which are disposed within the housing 100. The first photoelectric switch 71 and the second photoelectric switch 72 are located on the mounting plate, and the first photoelectric switch 71 is electrically connected to the second drive assembly 3. The laser projection device further includes a first trigger plate 81 and a second trigger plate 82, both of which are disposed on the lifting cover 1. The first trigger plate 81 is configured such that when the laser projection device is turned on and begins to work, the second drive assembly 3 drives the lifting cover 1 to rise to a target position in a direction away from the light outlet 101. The first trigger plate 81 triggers the first photoelectric switch 71, at which point the second drive assembly 3 stops driving and begins to drive the rotating cover 2 to rotate via the gear set 42 until the rotating cover 2 rotates in the first direction to the interior of the lifting cover 1. The second trigger plate 82 is configured as follows: when the laser projection device is turned off, the second drive component 3 drives the rotating cover body 2 to rotate out of the lifting cover body 1 and reset. When the second drive component 3 drives the lifting cover body 1 to descend to the initial position toward the light outlet 101, the second trigger plate 82 triggers the second photoelectric switch 72. At this time, the second drive component 3 stops driving, completing the covering and protection action of the lifting cover body 1 and the rotating cover body 2 on the light outlet 101.

[0068] It should be noted that during the factory debugging stage, the lifting cover 1 is raised and lowered under the drive of the second drive assembly 3. The debugging personnel found that the lifting cover 1 did not completely fit together with the rotating cover 2 after it was lowered. At this time, the step difference between the lifting cover 1 and the rotating cover 2 is large, which will cause a large amount of dust to enter the housing 100 through the height gap between the two covers and adhere to the lens surface, affecting the projection effect and image clarity of the lens, and dust attached to the lens can easily scratch the lens. The debugging personnel can use a debugging remote control that controls the second motor 31 to rotate forward or reverse, and control the second motor 31 to rotate forward or reverse at a certain angle according to the step difference until the lifting cover 1 is rotated into place, thereby reducing the step difference between the lifting cover 1 and the rotating cover 2 as much as possible. After the debugging personnel rotate the lifting cover body 1 to the final state through the debugging remote control, the next time the cover body is opened, the lifting cover body 1 is driven to rotate according to the final rotation angle to ensure that the lifting cover body 1 and the rotating cover body 2 are more adapted to each other, so that there is no problem of a large step difference between the lifting cover body 1 and the rotating cover body 2, so that the step difference between the lifting cover body 1 and the rotating cover body 2 after the lifting cover body 1 is lowered can be kept within 0.4mm.

[0069] In some embodiments, the lifting cover body 1 can be in the shape of a flat plate, parallel to the top cover of the shell 100; or, the lifting cover body 1 can also be composed of a top plate and side plates connected to each other to completely enclose the first accommodating cavity to ensure a dust-proof effect. As another example, the lifting cover body 1 can be a thin-walled part, which can not only reduce the space occupied and facilitate the avoidance of other components of the laser projection device, but also be visually regarded as a part of the shell 100, so that the overall aesthetics of the laser projection device are good. In addition, the lifting cover body 1 can be formed by laser welding, and the CD pattern on the top of the lifting cover body 1 is fixed to the top of the lifting cover body 1 by bonding, which reduces costs while improving the overall aesthetics of the cover body.

[0070] On this basis, the transmission mechanism of the second drive assembly 3 is connected to the second motor 31 and the lifting cover body 1, and the transmission mechanism is used to drive the lifting cover body 1 to move closer to or away from the light outlet 101 in a direction perpendicular to the shell 100. The above-mentioned transmission connection refers to a connection method that can realize the transmission of the power of the second motor 31 to the transmission mechanism, and then transmit it to the lifting cover body 1 through the transmission mechanism so that the lifting cover body 1 moves in a straight line. Exemplarily, the transmission mechanism can be a gear rack transmission mechanism, the gear is installed on the output shaft of the second motor 31, and the rack is installed on the lifting cover body 1; or, the transmission mechanism can also be a threaded transmission mechanism, the screw is coaxially fixedly connected to the output shaft of the second motor 31, and the nut is installed on the lifting cover body 1; or, the transmission mechanism can also be a cam transmission mechanism, which can also be applied. In this way, the second motor 31 can be driven by the transmission mechanism to drive the lifting cover body to move closer to or away from the light outlet 101 in a direction perpendicular to the top cover of the shell 100.

[0071] In some embodiments, as shown in Figures 7 to 10, the lifting cover body 1 includes a second cover plate 11 and a second mounting plate 12 connected to each other. The transmission mechanism of the second drive assembly 3 includes a cam 32, which is mounted on the output shaft of the second motor 31, and the rim of the cam 32 abuts against the lifting cover body 1. Exemplarily, the cam 32 can be directly mounted on the output shaft of the second motor 31 through a key connection; or, the cam 32 can also be mounted on a transmission shaft, and the transmission shaft and the output shaft of the second motor 31 are connected through a coupling, both of which can be applied. Another exemplary embodiment, the cam 32 can directly abut against the lifting cover body 1; or, the transmission mechanism of the second drive assembly 3 can also include a reinforcement block 33, which is connected to the lifting cover body 1 through a threaded connection and is located between the cam 32 and the lifting cover body 1, that is, the cam 32 indirectly abuts against the lifting cover body 1 through the reinforcement block 33, so that the cam 32 can be prevented from directly contacting the lifting cover body 1 and accelerating the wear of the lifting cover body 1.

[0072] Based on this, in order to make the lifting cover body 1 move along the set direction and move smoothly, the second driving assembly 3 also includes a guide member, which is arranged in the shell 100, and the guide member extends in a direction perpendicular to the lifting cover body 1, and the lifting cover body 1 is slidably connected to the guide member. Exemplarily, the guide member can be a linear guide rail, and a corresponding slide groove can be provided on the lifting cover body 1, and the lifting cover body 1 is slidably connected to the guide member through the slide groove; or the guide member can also be a guide column, and an adaptive guide hole can be provided on the lifting cover body 1, and the lifting cover body 1 can achieve a sliding connection with the guide member through the cooperation of the guide hole and the guide column, both of which can be applied. In this way, it can be ensured that the lifting cover body 1 approaches or moves away from the light outlet 101 in a direction perpendicular to the top cover of the shell 100, and the lifting cover body 1 can be moved smoothly.

[0073] In some embodiments, as shown in FIG10 , the guide member includes a guide shaft 34 disposed within the housing 100, with the guide shaft 34 extending through the second mounting plate 12. For example, the end of the guide shaft 34 distal from the light outlet 101 can be directly connected to the housing 100; alternatively, the end of the guide shaft 34 distal from the light outlet 101 can be indirectly connected to the housing 100 via a mounting base 6 or other structure. Furthermore, the second drive assembly 3 further includes a linear bearing 35 fixedly connected to the second mounting plate 12, with at least a portion of the linear bearing 35 located between the guide shaft 34 and the second mounting plate 12. Exemplarily, the linear bearing 35 may include a connecting plate 351 and a sliding sleeve 352 connected to each other. The connecting plate 351 may be arranged around the outer wall of the sliding sleeve 352. The connecting plate 351 may be connected to the second mounting plate 12 via a threaded connector. The sliding sleeve 352 is sleeved on the guide shaft 34, that is, the sliding sleeve 352 is located between the guide shaft 34 and the through hole of the second mounting plate 12. In this way, the second mounting plate 12 is prevented from directly contacting and rubbing with the guide shaft 34, thereby accelerating the wear of the second mounting plate 12. At the same time, the resistance to the movement of the lifting cover 1 can be reduced, making it easier to drive the lifting cover 1 to move. Exemplarily, the number of guide shafts 34 and linear bearings can be two, symmetrically arranged on both sides of the axis of the cam 32, which can make the movement of the lifting cover 1 more stable. In order to ensure the reliability of the movement of the lifting cover 1, in some embodiments, the second drive assembly 3 also includes a limiter 341 and a spring 36. The limiter 341 is arranged on the guide shaft 34 and is located on both sides of the second mounting plate 12 with the cam 32. Exemplarily, the stopper 341 can be an open collar that is sleeved onto the guide shaft 34. The two ends of the open collar are connected by a threaded connector to secure the open collar to the guide shaft 34. This allows the position of the stopper 341 on the guide shaft 34 to be adjusted as needed, making adjustment and removal easy and highly adaptable. It should be noted that in other embodiments, the stopper 341 can also be a sleeve that has an interference fit with the guide shaft 34 and is equally applicable. On this basis, the spring 36 is sleeved onto the guide shaft 34, with the two ends of the spring 36 respectively abutting the second mounting plate 12 and the stopper 341. In this way, when the lifting cover body 1 needs to be moved toward the light outlet 101 (or the bottom wall of the housing 100) in a direction perpendicular to the top wall of the housing 100, the lifting cover body 1 will move toward the light outlet 101 under the elastic force of the spring 36, thereby ensuring the reliability of the movement of the lifting cover body 1, and further ensuring that the surface of the lifting cover body 1 facing the outside of the housing 100 is coplanar with the surface of the rotating cover body 2 facing the outside of the housing 100, thereby making the appearance of the laser projection device beautiful. For example, when the number of guide shafts 34 is two, the number of limit members 341 and springs 36 is two, and the limit members 341 correspond one to one with the springs 36, so that the movement of the lifting cover body 1 is more stable.

[0074] In some embodiments, as shown in Figure 7, the lifting cover body 1 also includes a side panel 13 connecting the second cover plate 11 and the second mounting plate 12. The side panel 13, the second cover plate 11 and the second mounting plate 12 are arranged to form an accommodating cavity, and the diameter of the lifting cover body 1 is larger than the diameter of the rotating cover body 2. The rotating cover body 2 rotates along the first direction into the accommodating cavity, so that when the rotating cover body 2 rotates to the position where the light outlet 101 is exposed, it can be stacked with the lifting cover body 1. In this way, the concealment of the rotating cover body 2 can be increased, and the structural space formed by the lifting cover body 1 can be fully utilized, so that there is a certain gap between the outer wall of the rotating cover body 2 and the inner wall of the lifting cover body 1. The space occupied by the rotating cover body 2 when rotating is small, thereby ensuring the overall aesthetics of the cover body.

[0075] 11 to 23 , in some embodiments, the detection member includes a position sensor, which is fixed to the housing. The laser projection device also includes a lifting cover body, which is located at the light outlet 101. The first drive assembly includes: a first motor and a first transmission assembly, the first transmission assembly being respectively connected to the rotating cover body 2 and the first motor, and the first motor being used to drive the rotating cover body 2 to rotate relative to the lifting cover body through the first transmission assembly to expose or cover the light outlet 101. After the rotating cover body 2 is driven to rotate by the first transmission assembly and the corresponding rotating sensing member 51 is detected by the position sensor, the speed of the first motor is controlled to decrease, and after detecting that the current of the first motor is greater than or equal to the current threshold, the first motor is controlled to switch to a stopped working state.

[0076] In the embodiment of the present application, a position sensor 400 is provided on the housing 100, and a rotation sensing element 51 corresponding to the position sensor 400 is provided on the rotating cover 2. Thus, when the first motor 501 drives the rotating cover 2 to rotate relative to the lifting cover 300 via the first transmission assembly 502, the rotation sensing element 51 will also rotate with the rotating cover 2. For example, in the process of the first motor 501 driving the rotating cover body 2 to rotate through the first transmission assembly 502 to cover the light outlet 101 of the shell body 100, after the rotating cover body 2 rotates to a certain position and detects the corresponding rotation sensing member 51 through the position sensor 400, the position sensor 400 can send a response signal to the controller 600 to enable the controller 600 to control the speed of the first motor 501 to decrease; then the first motor 501 continues to drive the rotating cover body 2 to rotate at a low speed relative to the lifting cover body 300 through the first transmission assembly 502 until the rotating cover body 2 rotates to the target position (that is, the position where the rotating cover body completely covers the light outlet 101) and the first motor 501 is blocked; finally, after the controller 600 detects that the current of the first motor 501 is greater than or equal to the current threshold, it controls the first motor 501 to switch to a stop working state. In this way, the probability of a large flash gap caused by the cumulative error in the processing accuracy of the rotating cover 2 and the position accuracy of each component when the rotating cover 2 covers the light outlet 101 is effectively reduced, so that the rotating cover 2 has a better protective effect on the projection lens integrated in the laser projection equipment.

[0077] It should be noted that when a motor is subjected to an obstructing force, it may stall, causing the motor's current to increase. In this application, by combining the cooperation of the position sensor and the rotation sensing element, the first motor stalls after the rotating cover rotates to the target position relative to the elevating cover, thereby reducing the gap between the rotating cover and the elevating cover.

[0078] In summary, embodiments of the present application provide a laser projection device that may include: a housing, a rotating cover, a lifting cover, at least one position sensor, a first drive assembly, and a controller. By providing a position sensor on the housing and a rotational sensing element corresponding to the position sensor on the rotating cover, as the first motor drives the rotating cover to rotate relative to the lifting cover via the first transmission assembly, the rotational sensing element also rotates with the rotating cover. For example, when the first motor drives the rotating cover to rotate relative to the lifting cover via the first transmission assembly to seal the light outlet 101 of the housing, after the rotating cover rotates to a certain position and the corresponding rotational sensing element is detected by the position sensor, the position sensor may send a response signal to the controller, causing the controller to control the first motor to reduce its speed. The first motor then continues to drive the rotating cover to rotate relative to the lifting cover at a low speed via the first transmission assembly until the rotating cover rotates to the target position and the first motor stalls. Finally, after the controller detects that the current of the first motor is greater than or equal to a current threshold, it controls the first motor to switch to a stopped state. In this way, the probability of a large flash gap caused by the cumulative error in the processing accuracy of the rotating cover and the position accuracy of each component when the rotating cover and the lifting cover cover the light outlet 101 is effectively reduced, so that the rotating cover has a better protective effect on the projection lens integrated in the laser projection equipment.

[0079] In some embodiments, please refer to Figures 15 and 16. Figure 15 is a partial structural diagram of another laser projection device provided in an embodiment of the present application, and Figure 16 is a partial structural diagram of the structure shown in Figure 15. The laser projection device may include two rotating covers 2. A first transmission assembly 502 is connected to each of the two rotating covers 2. The first motor 501 can drive the two rotating covers 2 to rotate in opposite directions relative to the lifting cover 300 through the first transmission assembly 502. The at least one position sensor 400 may include two position sensors. The two rotation sensing members 51 corresponding to the two position sensors are respectively connected to a first moving member and a second moving member. The first moving member and the second moving member can both be fixed to the same rotating cover. After the two rotating covers 2 rotate relative to the lifting cover 300 to the position of the light outlet 101 on the cover housing 100, the first moving member can be located on the side of the rotating cover 2 closer to the lifting cover 300, and the second moving member can be located on the side of one rotating cover 2 closer to the other rotating cover 2. For example, the two rotating covers 2 in the laser projection device can be respectively rotating cover A1 and rotating cover A2 that are arranged opposite to each other; the two position sensors 400 in the laser projection device can be respectively position sensor B1 and position sensor B2, and the rotating sensing parts corresponding to the sensors B1 and position sensor B2 are the first moving part C1 and the second moving part C2, and both the first moving part C1 and the second moving part C2 can be fixed on the rotating cover A1. In this way, when the rotating cover body A1 and the rotating cover body A2 rotate in opposite directions relative to the lifting cover body 300 to cover the light outlet 101, the first motor 501 drives the two rotating cover bodies to rotate at the same time through the first transmission assembly 502; after the rotating cover body A1 drives the first moving part C1 to rotate until it is detected by the position sensor B1; the controller 600 controls the speed of the first motor 501 to reduce, and after the two rotating cover bodies rotate to the position of covering the light outlet 101, the first motor 501 is blocked, and the controller 600 then controls the first motor 501 to switch to a stop working state, at this time it can effectively ensure that the flash gap between the two rotating cover bodies 2 after covering the light outlet 101 is small.

[0080] During the process of rotating the cover A1 and the cover A2 rotating in opposite directions relative to the lifting cover 300 to fully expose the light outlet 101, the first motor 501 drives the two rotating covers 2 to rotate simultaneously through the first transmission assembly 502; after the rotating cover A1 drives the second moving part C2 to rotate until it is detected by the position sensor B2; the controller 600 controls the speed of the first motor 501 to reduce, and after the two rotating covers 2 rotate to a position that fully exposes the light outlet 101, the first motor 501 is stalled, and the controller 600 then controls the first motor 501 to switch to a stopped working state. For example, the position sensor in the present application can be a photoelectric switch.

[0081] It should be noted that, in other possible implementations, a position sensor may not be provided in the laser projection device. The controller is configured to: after detecting that the number of steps of the first motor reaches a predetermined number of steps, control the rotation speed of the first motor to decrease. Then, after detecting that the current of the first motor is greater than or equal to the current threshold, control the first motor to switch to a stopped working state. Alternatively, the controller is configured to: after detecting that the running time of the first motor reaches a predetermined time, control the rotation speed of the first motor to decrease. Then, after detecting that the current of the first motor is greater than or equal to the current threshold, control the first motor to switch to a stopped working state.

[0082] In an embodiment of the present application, please refer to Figure 17, which is a partial structural diagram of another laser projection device provided in an embodiment of the present application. The laser projection device may also include: a support base 700 fixed on the shell 100, and two brackets fixedly connected to the support base 700. The two brackets can be distributed on both sides of the support base 700 and can correspond one to one with the two rotating cover bodies 2. Among them, the first drive assembly 4 can be fixed on the support base 700, and the two position sensors 400 are fixed on the bracket corresponding to the rotating cover body 2 on which the first moving part C1 and the second moving part C2 are set. For example, the two brackets fixedly connected to the support base 700 are bracket D1 and bracket D2, bracket D1 can correspond to the rotating cover body A1, bracket D2 can correspond to the rotating cover body A2, and the position sensor B1 and the position sensor B2 can both be connected to the bracket D1. Thus, by disposing the rotation sensing element on the rotating cover 2 and the position sensor 400 on the bracket, the rotation of the rotating cover 2 drives the rotation sensing element to rotate, thereby directly detecting the rotational position accuracy of the rotating cover 2 through cooperation with the corresponding position sensor. This avoids the adverse effect of the cumulative position accuracy errors of the components caused by disposing the rotation sensing element on other components on the rotational position accuracy of the rotating cover 2. In addition, disposing the first drive assembly 4 on the support base 700 makes the overall structure of the laser projection device more compact.

[0083] In some embodiments, as shown in Figures 15, 16, and 17, the laser projection device may further include: a limiting plate 800 fixed to each bracket, and each rotating cover body 2 may further include a first baffle 202 and a second baffle 203 that cooperate with the limiting plate 800 on the bracket corresponding to the rotating cover body 2. Specifically, after the two rotating covers 2 rotate relative to the lifting cover body 300 to the position of the light outlet 101 on the cover shell 100, the first baffle 202 may be located on the side of the rotating cover body 2 close to the lifting cover body 300 and in contact with one side of the limiting plate 800; the second baffle 203 may be located on the side of one rotating cover body 2 close to the other rotating cover body 2. When the two rotating covers 2 rotate from a position covering the light outlet 101 to a position fully exposing the light outlet 101, the two first baffles 202 on the two rotating covers 2 move toward each other, while the two second baffles 203 on the two rotating covers 2 move away from each other. After the two rotating covers 2 rotate relative to the lifting cover 300 to fully expose the light outlet 101 on the housing 100, the distance between the two second baffles 203 is maximized. For example, the limit plate 800 fixed to the bracket D1 can be the limit plate E1, and the limit plate 800 fixed to the bracket D2 can be the limit plate E2. The first baffle 202 set on the rotating cover A1 can be the first baffle F1, and the second baffle 203 can be the second baffle F2; the first baffle 202 set on the rotating cover A2 can be F3, and the second baffle is not shown in the figure. After the rotating cover A1 and the rotating cover A2 rotate relative to the lifting cover 300 to a position covering the light outlet 101, the first baffle F1 can be located on the side of the rotating cover A1 that is close to the lifting cover 300, and the first baffle F1 abuts one side of the limit plate E1. The second baffle F2 can be located on the side of the rotating cover A1 that is close to the rotating cover A2. The first baffle F3 can be located on the side of the rotating cover A2 that is close to the lifting cover 300, and the first baffle F3 abuts one side of the limit plate E2. The second baffle can be located on the side of the rotating cover A2 that is close to the rotating cover A1.

[0084] After the rotating cover A1 and the rotating cover A2 rotate relative to the lifting cover 300 to a position that fully exposes the light outlet 101, the second baffle F2 on the rotating cover A1 rotates to abut against the other side of the limit plate E1, and the second baffle F2 on the rotating cover A2 can abut against the other side of the limit plate E2. It should be noted that the cooperation between the limit plate and the baffle further ensures the positional accuracy of the two rotating covers 2 when covering the light outlet 101 of the housing 100 or fully exposing the light outlet 101 of the housing 100.

[0085] In the embodiment of the present application, as shown in Figures 15 and 17, for a rotating cover body 2 provided with a first moving part C1 and a second moving part C2, this rotating cover body 2 may also have a first connecting member 204 and a second connecting member 205. The first connecting member 204 may be fixedly connected to both the first moving part C1 and the first baffle F1, and the second connecting member 205 may be fixedly connected to both the second moving part C2 and the second baffle F2. In the present application, for another rotating cover body 2, this rotating cover body may have a third connecting member 206 and a fourth connecting member (not shown in the figure). The third connecting member 206 may be fixedly connected to the first baffle F3, and the fourth connecting member may be fixedly connected to the second baffle.

[0086] In some embodiments, as shown in FIG16 , both sides of the limiting plate 800 provided on the bracket may have a first buffer 801. For example, by providing the first buffer 801 on both sides of the limiting plate E1, and providing the first buffer 801 on both sides of the limiting plate E2. In this way, when the baffle is in contact with the limiting plate, it can play a certain buffering role on the baffle, ensuring that no violent collision occurs when the two rotating cover bodies 2 contact, thereby improving the reliability of the laser projection device during use. In the present application, as shown in FIG15 , the laser projection device may further include: a second buffer 900 fixedly connected to at least one rotating cover body 2. Wherein, after the two rotating cover bodies 2 rotate relative to the lifting cover body 300 to the position of the light outlet 101 on the cover shell 100, the second buffer 900 can be located between the two rotating cover bodies 2. In this way, when the two rotating covers 2 rotate relative to the lifting cover 300 to cover the light outlet 101, violent collision and contact between the two rotating covers 2 is avoided, that is, the abnormal noise caused by the collision of the two rotating covers 2 can be effectively avoided, the noise is reduced, and the user experience is improved. For example, the number of second buffer members 900 in the laser projection device can be two, and the two second buffer members 900 can be fixedly connected to the two rotating covers 2 respectively. After the two rotating covers 2 rotate relative to the lifting cover 300 to the position of the light outlet 101 on the cover shell 100, the two second buffer members 900 can be located between the two rotating covers 2, and the two second buffer members 900 can be in contact.

[0087] In some embodiments, please refer to Figure 18, which is a partial structural diagram of another laser projection device provided in an embodiment of the present application. The first transmission assembly 502 in the first drive assembly 4 may include: a rotating shaft 502a, two transmission wheels 502b and two transmission parts 502c. Among them, the rotating shaft 502a in the first transmission assembly 502 can be fixed on the support base 700, and the two transmission wheels 502b can be sleeved on the rotating shaft 502a and rotatably connected to the rotating shaft 502a. The two transmission wheels 502b can also be fixedly connected to the two rotating cover bodies 2 respectively, and the two transmission wheels 502b are respectively connected to the two transmission parts 502c, and the two transmission parts 502c can both be connected to the first motor 501. In this case, the two rotating cover bodies 2 are rotatably connected to the rotating shaft 502a through the two transmission wheels 502b, and the two transmission wheels 502b are respectively connected to the two transmission parts 502c. In this manner, the first motor 501 simultaneously drives the two transmission parts 502c to rotate, which in turn drives the two transmission wheels 502b to rotate, thereby enabling the two rotating covers 2 to rotate in opposite directions relative to the elevating cover 300. Furthermore, by driving the two rotating covers 2 through the combination of the transmission wheels 502b and the transmission parts 502c, the first drive assembly 4 can be made more compact, saving space within the laser projection device.

[0088] In an embodiment of the present application, please refer to Figures 18 and 19. Figure 19 is a schematic diagram of the connection between a first transmission assembly and two rotating covers provided in an embodiment of the present application. Both transmission components 502c may include a gear set, wherein a transmission wheel 502b may mesh with a gear in the gear set, with the two gear sets having two meshing gears. The first transmission assembly 502 in the first drive assembly 4 may also include a drive gear 502d connected to the output shaft of the first motor 501, wherein the drive gear 502d may mesh with a gear in one of the gear sets. In this case, the first motor 501 simultaneously drives the two gear sets to rotate, and the meshing transmission between the two gear sets and the two transmission wheels 502b drives the two rotating covers 2 to rotate in opposite directions relative to the lifting cover 300. In this way, the use of multiple gear combinations to drive the two rotating covers 2 ensures transmission accuracy and ensures smooth rotation of the two rotating covers. For example, the two gear sets may be gear set G1 and gear set G2, and the two transmission wheels 502b may be transmission wheels G3 and transmission wheels G4. Gear set G1 may include a first gear G11 and two coaxially rotating second gears G12, and gear set G2 may include a third gear G21 and a fourth gear G22. The first gear G11 meshes with the third gear G21, one second gear G12 meshes with the first gear G11, and the other second gear G12 meshes with the transmission gear G3. The third gear G21 meshes with the fourth gear G22 and the drive gear 502d, respectively, and the fourth gear G22 may mesh with the transmission gear G4. It should be noted that the first gear G11 and the third gear G21 have the same structure, the two coaxially rotating second gears G12 have the same structure, and the transmission gears G3 and G4 may have the same structure. It should also be noted that the number of teeth on the drive gear 502d can be smaller than that on the third gear G21 to reduce the output speed of the first motor 501.

[0089] In some embodiments, please refer to FIG. 20 , which is an exploded schematic diagram of a partial structure of a laser projection device provided in an embodiment of the present application. The laser projection device may further include: a second drive assembly 1000, which is connected to the housing 100 and the lifting cover 300, respectively, and can be used to drive the lifting cover 300 to move toward or away from the light outlet 101 of the housing 100. In the present application, the second drive assembly 1000 may include: a second motor 1001 and a second transmission assembly 1002, wherein the second motor 1001 is fixed to the housing 100 and electrically connected to the controller 600, and the second transmission assembly 1002 is respectively connected to the second motor 1001 and the lifting cover 300. In this way, the second motor 1001 and the second transmission assembly 1002 can drive the lifting cover 300 to move toward or away from the light outlet 101 of the housing 100. For example, the second motor 1001 can be fixedly connected to the support base 700. It should be noted that the transmission connection refers to a connection method that can transmit the power of the second motor to the second transmission assembly, and then transmit it to the lifting cover body through the second transmission assembly to enable the lifting cover body to move in a straight line.

[0090] In some embodiments, please refer to Figures 20 and 21. Figure 21 is a schematic diagram of the connection between a second transmission assembly and a housing provided in an embodiment of the present application. The second transmission assembly 1002 includes: a cam 21 mounted on the output shaft of the second motor 1001, and the rim of the cam 21 can abut against the lifting cover 300. In addition, to prevent the lifting cover 300 from directly contacting the cam 21 and causing a large degree of wear after long-term use, the second transmission assembly 1002 can also include: a reinforcement block 22 fixed to the lifting cover 300, and the reinforcement block 22 can be located between the cam 21 and the lifting cover 300. In this way, the cam 21 can indirectly abut against the lifting cover 300 through the reinforcement block 22, ensuring that the lifting cover 300 is less worn after long-term use. It should be noted that in other possible implementations, the second transmission assembly 1002 can include: a gear and a rack (not shown in the figure). The gear can be mounted on the output shaft of the second motor, and the rack can be mounted on the lifting cover, and the gear and the rack are meshed.

[0091] In an embodiment of the present application, as shown in FIG21 , the laser projection device may further include: a first position sensor 1100 and a second position sensor 1200 fixed to the housing 100, and a third moving member 1300 and a fourth moving member 1400 fixed to the lifting cover 300 and corresponding to the first position sensor 1100 and the second position sensor 1200, respectively. The first position sensor 1100 and the second position sensor 1200 may be electrically connected to the controller 600. The controller 600 may be configured to: after the lifting cover 300 is driven to move to the first preset position by the second transmission assembly 1002 and the third moving member 1300 is detected by the first position sensor 1100, control the second motor 1001 to switch to a stopped state; and after the lifting cover 300 is driven to move to the second preset position by the second transmission assembly 1002 and the fourth moving member 1400 is detected by the second position sensor 1200, control the second motor 1001 to switch to a stopped state. It should be noted that the first preset position may be the highest position at which the cam 21 drives the lifting cover 300 to rise when the optical engine integrated in the laser projection device emits light outward through the light outlet 101. The second preset position may be the lowest position at which the cam 21 drives the lifting cover 300 to descend, at which point the outer side surface of the lifting cover 300 and the outer side surface of the rotating cover 2 can be coplanar, so that the step difference between the lifting cover 300 and the rotating cover 2 is substantially zero.

[0092] In some embodiments, as shown in Figure 21, taking the connection method between the third moving part 1300 and the lifting cover body 300 as an example, the lifting cover body 300 may have a positioning column 301, and the third moving part 1300 may have a positioning hole a1, which can be sleeved on the positioning column 301. In this way, when the third moving part 1300 is assembled with the lifting cover body 300, the relative position accuracy of the third moving part 1300 and the lifting cover body 300 can be ensured by the cooperation of the positioning column 301 and the positioning hole a1, thereby ensuring the position accuracy of the third moving part 1300 and the first position sensor 1100, and then the third moving part 1300 can be fixedly connected to the lifting cover body 300 by screw connection. It should be noted that the connection method between the fourth moving part 1400 and the lifting cover body 300 can refer to the connection method between the third moving part 1300 and the lifting cover body 300, and will not be repeated here. In this application, please refer to Figures 21 and 22. Figure 22 is a schematic diagram of the connection between another second transmission assembly and the shell provided in an embodiment of the present application. The laser projection device may further include: a connecting plate 1500 fixedly connected to the inner wall of the lifting cover 300, the connecting plate 1500 may have a mounting hole a2, and the plane on which the connecting plate 1500 is located may be perpendicular to the moving direction of the lifting cover 300. The rim of the cam 21 in the second transmission assembly 1002 may abut against the connecting plate 1500, and the third moving member 1300 and the fourth moving member 1400 may both be fixed to the connecting plate 1500. The second transmission assembly 1002 may further include: a guide member 23, one end of the guide member 23 may be fixed to the housing (for example, it may be fixed to a support seat), and the other end may pass through the mounting hole a2 and be movably connected to the connecting plate 1500. In this way, when the lifting cover 300 moves toward or away from the light outlet 101 of the housing, the guide member 23 can play a certain guiding role in the movement of the lifting cover 300, thereby ensuring the accuracy of its movement.

[0093] In an embodiment of the present application, as shown in FIG22 , the laser projection device may further include: a support mechanism 1600 fixedly connected to one side of each rotating cover 2, and the rotating cover 2 may cover the support mechanism 1600. The support mechanism 1600 is used to slide in contact with the connecting plate 1500 when the first drive assembly 4 drives the rotating cover 2 to rotate relative to the lifting cover 300 to expose the light outlet 101. In this way, the support mechanism 1600 can provide good support and reinforcement for the rotating cover 2, ensuring that the step difference between the two rotating covers 2 and the lifting cover 300 is small. For example, when the laser projection device needs to have the light outlet 101 to project an image beam, the second drive assembly 1000 first drives the lifting cover 300 to move away from the light outlet 101, so that the connecting plate 1500 provided on the lifting cover 300 contacts the support mechanism 1600. During the rotation of the two rotating covers 2 relative to the lifting cover 300, the support mechanism 1600 can slide on the connecting plate 1500. When the laser projection device is turned off, the first drive assembly 4 drives the two rotating covers 2 to close, and then the second drive assembly 1000 drives the lifting cover 300 to descend to the lowest position to cover the light outlet 101 on the shell 100 together with the two rotating covers 2.

[0094] The following embodiment describes a structural form of the rotating cover body 2 and the lifting cover body 300. In particular, please refer to Figure 23, which is an exploded schematic diagram of a partial structure of a rotating cover body and a lifting cover body provided in an embodiment of the present application. The rotating cover body 2 may include: a first curved side panel H1, and a first top panel H2 fixedly connected to one side of the first curved side panel H1. The first curved side panel H1 and the first top panel H2 may be made by integral molding; alternatively, the first curved side panel H1 and the first top panel H2 may be made by laser welding. In addition, in order to ensure the appearance performance of the laser projection device, the laser projection device may further include: a first decorative piece 1700 bonded to the side of the first top panel H2 facing away from the first curved side panel H1, and the first decorative piece 1700 improves the aesthetics of the rotating cover body 2.

[0095] As shown in Figure 23, the lifting cover 300 may include: a second curved side panel H3, and a second top panel H4 fixedly connected to one side of the second curved side panel H3. The second curved side panel H3 and the second top panel H4 may be formed in one piece; alternatively, the second curved side panel H3 and the second top panel H4 may be formed by laser welding. In addition, to ensure the appearance and performance of the laser projection device, the laser projection device may also include: a second decorative piece 1800 bonded to the side of the second top panel H4 facing away from the second curved side panel H3. The second decorative piece 1800 enhances the aesthetics of the lifting cover 300.

[0096] In summary, embodiments of the present application provide a laser projection device that may include: a housing, a rotating cover, a lifting cover, at least one position sensor, a first drive assembly, and a controller. By providing a position sensor on the housing and a rotational sensing element corresponding to the position sensor on the rotating cover, as the first motor drives the rotating cover to rotate relative to the lifting cover via the first transmission assembly, the rotational sensing element also rotates with the rotating cover. For example, when the first motor drives the rotating cover to rotate relative to the lifting cover via the first transmission assembly to seal the light outlet 101 of the housing, after the rotating cover rotates to a certain position and the corresponding rotational sensing element is detected by the position sensor, the position sensor may send a response signal to the controller, causing the controller to control the first motor to reduce its speed. The first motor then continues to drive the rotating cover to rotate relative to the lifting cover at a low speed via the first transmission assembly until the rotating cover rotates to the target position and the first motor stalls. Finally, after the controller detects that the current of the first motor is greater than or equal to a current threshold, it controls the first motor to switch to a stopped state. In this way, the probability of a large flash gap caused by the cumulative error in the processing accuracy of the rotating cover and the position accuracy of each component when the rotating cover and the lifting cover cover the light outlet 101 is effectively reduced, so that the rotating cover has a better protective effect on the projection lens integrated in the laser projection equipment.

[0097] The embodiment of the present application provides an optical engine, which is configured in the laser projection device shown in Figures 1 to 23. The optical engine is described below with reference to Figures 24 to 27.

[0098] FIG24 is a schematic diagram of projection by a laser projection device. Referring to FIG24 , when the laser projection device is in operation, its internal optical engine operates to project a projection beam obliquely upward through a light outlet 101 onto a projection medium A (e.g., a projection screen, a wall, etc.), thereby forming an image on the projection medium A. Exemplarily, the laser projection device is an ultra-short-throw laser projection device.

[0099] FIG25 is a schematic diagram of the internal structure of the optical engine. In conjunction with FIG25 , in this embodiment, the optical engine includes an entire housing 10000 (only a portion of the entire housing 10000 is shown in FIG25 ), a light source assembly 20000, an optical engine 30000, a lens 40000, a circuit board 50000 assembled in the entire housing 10000, and internal cooling systems, speakers, etc. The light source assembly 20000 is configured to provide an illumination beam (laser beam). The optical engine 30000 is configured to modulate the illumination beam provided by the light source assembly 20000 using an image signal to obtain a projection beam. The lens 40000 is an ultra-short-throw projection lens, which is configured to project the projection beam onto a screen or wall to form an image. The light source assembly 20000, the optical engine 30000, and the lens 40000 are connected in sequence along the direction of beam propagation, and each is enclosed by a corresponding housing. The respective housings of the light source assembly 20000, the optical engine 30000 and the lens 40000 support the corresponding optical components and enable each optical component to meet certain sealing or airtight requirements.

[0100] FIG26 is a schematic diagram of the assembly of the light source assembly, optical engine, and lens. In conjunction with FIG26 , one end of the optical engine 30000 is connected to the light source assembly 20000, and the light source assembly 20000 and the optical engine 30000 are arranged along the exit direction of the illumination beam of the laser projection device (refer to the M direction shown in FIG26 ). The other end of the optical engine 30000 is connected to the lens 40000, and the optical engine 30000 and the lens 40000 are arranged along the exit direction of the projection beam of the laser projection device (refer to the N direction shown in FIG26 ). The exit direction M of the illumination beam is approximately perpendicular to the exit direction N of the projection beam. This connection structure, on the one hand, can adapt to the optical path characteristics of the reflective light valve in the optical engine 30000, and on the other hand, it is also beneficial to shorten the length of the optical path in one dimension, which is beneficial to the structural arrangement of the entire machine. For example, when the light source assembly 20000, the optical engine 30000 and the lens 40000 are arranged in one dimensional direction (for example, the M direction), the length of the light path in this dimensional direction will be very long, which is not conducive to the structural arrangement of the entire machine.

[0101] In some embodiments, the light source assembly 20000 can provide three primary colors of light in a timely manner (other colors of light can also be added on the basis of the three primary colors of light), and then due to the persistence of vision of the human eye, the human eye sees white light formed by the mixture of the three primary colors of light. Alternatively, the light source assembly 20000 can also output the three primary colors of light at the same time and continuously emit white light. The light source assembly 20000 includes a laser, which can emit a laser beam of at least one color, for example, only a red laser beam or a blue laser beam or a green laser beam, or simultaneously emit a red laser beam, a blue laser beam and a green laser beam. The laser can be a laser with a multi-chip package structure. A laser with a multi-chip package structure refers to a plurality of light-emitting chips arranged in rows or in a row and column matrix that are packaged on the same base plate. These multiple light-emitting chips can be packaged in one space by one tube shell, or can be packaged in multiple spaces by multiple tube shells.

[0102] FIG27 is a schematic diagram of the optical path of the optical engine. In conjunction with FIG27 , the lens 40000 comprises a plurality of lens elements, which are exemplarily divided into three groups: a front group, a middle group, and a rear group, or a two-group group: a front group and a rear group. The front group is the lens group located near the light-emitting side of the laser projection device 1 (e.g., the side of the lens 40000 facing away from the optical engine 30000 along the N direction in FIG27 ), and the rear group is the lens group located near the light-emitting side of the optical engine 30000 (e.g., the side of the lens 40000 facing away from the optical engine 30000 along the opposite direction of the N direction in FIG27 ). Exemplarily, the lens 40000 is a zoom lens, a fixed-focus adjustable lens, or a fixed-focus lens.

[0103] In this application, the terms "at least one of A and B" and "A and / or B" are merely a description of the association relationship of associated objects, indicating that there can be three kinds of relationships, namely, A exists alone, A and B exist at the same time, and B exists alone. The term "at least one of A, B, and C" indicates that there can be seven kinds of relationships, which can represent seven situations: A exists alone, B exists alone, C exists alone, A and B exist at the same time, A and C exist at the same time, C and B exist at the same time, and A, B, and C exist at the same time. In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The term "at least one" refers to one or more, and the term "multiple" refers to two or more, unless otherwise expressly defined.

[0104] The words "include" and "including" mentioned throughout the specification and claims are open-ended terms and should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem and basically achieve the technical effect. Certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in name as a way to distinguish components, but rather use differences in the functions of the components as the criterion for distinction.

[0105] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A laser projection device, characterized in that: include: A housing, wherein an optical engine is disposed in the housing, and a light outlet is disposed on the housing for allowing an image light beam emitted by the optical engine to pass through; A rotating cover body, arranged at the light outlet; A first driving assembly, connected to the rotating cover body, and used to drive the rotating cover body to rotate relative to the housing to expose or cover the light outlet; A rotating sensing member, drivingly connected to the first driving assembly, so that the rotating sensing member and the rotating cover body rotate synchronously; A detection member, arranged corresponding to the rotation sensing member; A controller, electrically connected to the detection element and the first driving assembly; Wherein, the rotation sensing component is configured to trigger the detection component during the rotation of the rotating cover body, so as to detect the rotation state of the rotating cover body through the detection component, and the controller controls the start and stop of the first driving component according to the detection result of the detection component.

2. The laser projection device according to claim 1, characterized in that: The rotation state of the rotating cover body includes a rotation angle of the rotating cover body or a rotation position of the rotating cover body.

3. The laser projection device according to claim 2, characterized in that: The detection member includes a rotation sensor; During the rotation of the rotating sensing element, one end of the rotating sensing element along the rotation direction can contact the rotation sensor to trigger the rotation sensor, and the rotating sensing element continues to contact the rotation sensor until the other end of the rotating sensing element along the rotation direction leaves the rotation sensor.

4. The laser projection device according to claim 3, characterized in that: The number of the rotation sensors is two, namely a first rotation sensor and a second rotation sensor, and the first rotation sensor and the second rotation sensor are arranged at an interval; During the rotation of the rotating sensing element, when one end of the rotating sensing element located at the front end in the rotation direction contacts one of the first rotation sensor and the second rotation sensor, one end of the rotating sensing element located at the rear end in the rotation direction leaves the other of the first rotation sensor and the second rotation sensor.

5. The laser projection device according to any one of claims 2 to 4, characterized in that: The laser projection device also includes a lifting cover and a second driving assembly; The lifting cover is arranged at the light outlet; The second driving assembly is connected to the lifting cover body, and is used to drive the lifting cover body to move relative to the housing in the direction of the image light beam transmitted through the light outlet or in the opposite direction of the image light beam transmitted through the light outlet to move away from or close to the light outlet; The first driving component is used to drive the rotating cover body to rotate to the inside of the lifting cover body to expose the light outlet, or drive the rotating cover body to rotate out from the inside of the lifting cover body to cover the light outlet when the lifting cover body moves to a preset position relative to the shell along the direction of the image light beam passing through the light outlet.

6. The laser projection device according to claim 5, characterized in that: The rotating cover body and the lifting cover body are both semicircular in structure, and the rotating cover body and the lifting cover body are assembled together to form a circular cover structure; The first driving assembly is used to drive the rotating cover body to rotate relative to the shell in a first direction and rotate to the inside of the lifting cover body, and drive the rotating cover body to rotate relative to the shell in a direction opposite to the first direction and rotate out from the inside of the lifting cover body.

7. The laser projection device according to claim 6, characterized in that: The first driving assembly includes a first motor and a gear set drivingly connected to the first motor; The rotating cover body is provided with a rotating bearing, the gear set is cooperatively connected with the rotating bearing, and the first motor drives the rotating cover body to rotate through the gear set.

8. The laser projection device according to claim 7, characterized in that: The gear set comprises a first gear, a second gear and a third gear meshed in sequence, the first gear is connected to the output shaft of the first motor, the second gear is meshed with the first gear and the third gear respectively, and the third gear is cooperatively connected with the rotary bearing; The rotating sensing element is in a fan-shaped structure, the center of which is connected to the rotation center of the second gear and rotates with the second gear. The arc-shaped outer contour surface of the fan-shaped structure contacts the detection element during the rotation of the rotating sensing element to trigger the detection element.

9. The laser projection device according to claim 5, characterized in that: The rotating cover body includes a first mounting plate and a first cover plate attached to the first mounting plate, the first driving assembly is connected to the first mounting plate, and a plurality of supporting gaskets are arranged between the first cover plate and the first mounting plate to adjust the height of the first cover plate relative to the lifting cover body and the parallelism of the first cover plate relative to its rotation direction through the plurality of supporting gaskets.

10. The laser projection device according to claim 5, characterized in that: The laser projection device also includes: A first photoelectric switch and a second photoelectric switch are both disposed in the housing, and the first photoelectric switch is electrically connected to the second driving assembly; A first trigger plate and a second trigger plate are both arranged on the lifting cover body, and the first trigger plate is configured to trigger the first photoelectric switch when the second driving component drives the lifting cover body to rise to a target position in a direction away from the light outlet; the second trigger plate is configured to trigger the second photoelectric switch when the second driving component drives the lifting cover body to descend to an initial position in a direction close to the light outlet.

11. The laser projection device according to claim 5, characterized in that: The lifting cover body comprises a second cover plate and a second mounting plate connected to each other; The second driving assembly includes a second motor, a cam and a guide shaft, the cam is connected to the output shaft of the second motor, the rim of the cam abuts against the second mounting plate, the guide shaft passes through the second mounting plate along the height direction of the lifting cover body, the lifting cover body and the guide shaft are slidably connected, a limit piece is sleeved on the end of the guide shaft close to the second cover plate, and an elastic piece is sleeved on the portion of the guide shaft located between the limit piece and the second mounting plate, and both ends of the elastic piece abut against the second mounting plate and the limit piece respectively.

12. The laser projection device according to claim 2, characterized in that: The detection member includes a position sensor, and the position sensor is fixed on the housing; The laser projection device further comprises a lifting cover body, wherein the lifting cover body is located at the light outlet; The first driving assembly includes: a first motor and a first transmission assembly, wherein the first transmission assembly is respectively connected to the rotating cover and the first motor, and the first motor is used to drive the rotating cover to rotate relative to the lifting cover through the first transmission assembly to expose or cover the light outlet; After the rotating cover body is driven to rotate by the first transmission assembly and the corresponding rotating sensing component is detected by the position sensor, the speed of the first motor is controlled to be reduced, and after detecting that the current of the first motor is greater than or equal to the current threshold, the first motor is controlled to switch to a stop working state.

13. The laser projection device according to claim 12, characterized in that: The laser projection device comprises two rotating covers, the first transmission assembly is connected to the two rotating covers respectively, and the two rotating covers rotate in opposite directions relative to the lifting cover; The position sensor comprises: two position sensors, and two rotating sensing parts corresponding to the two position sensors are respectively: a first moving part and a second moving part, and the first moving part and the second moving part are both fixed on the same rotating cover body; Among them, after the two rotating cover bodies rotate relative to the shell to the position of covering the light outlet, the first moving part is located on the side of the rotating cover body close to the lifting cover body, and the second moving part is located on the side of one rotating cover body close to the other rotating cover body.

14. The laser projection device according to claim 13, characterized in that: The laser projection device further comprises: a support base fixed on the housing, and two brackets fixedly connected to the support base, the two brackets being distributed on both sides of the support base and corresponding to the two rotating cover bodies one by one; Wherein, the first driving assembly is fixed on the supporting seat, and the two position sensors are fixed on a bracket corresponding to the rotating cover body on which the first moving part and the second moving part are arranged.

15. The laser projection device according to claim 14, characterized in that: The laser projection device further comprises: a limit plate fixed on each of the brackets; Each of the rotating cover bodies also has a first baffle and a second baffle that cooperate with the limiting plate; Among them, after the two rotating cover bodies rotate relative to the lifting cover body to the position of covering the light outlet, the first baffle is located on the side of the rotating cover body close to the lifting cover body and abuts against one side of the limiting plate, and the second baffle is located on the side of one rotating cover body close to the other rotating cover body.

16. The laser projection device according to claim 15, characterized in that: For the rotating cover body provided with the first moving part and the second moving part, the rotating cover body also has a first connecting part and a second connecting part, the first connecting part is fixedly connected to the first moving part and the first baffle at the same time, and the second connecting part is fixedly connected to the second moving part and the second baffle at the same time.

17. The laser projection device according to claim 15, characterized in that: Both sides of the limiting plate are provided with first buffer parts.

18. The laser projection device according to any one of claims 13 to 17, characterized in that: The laser projection device further comprises: a second buffer member fixedly connected to at least one of the rotating cover bodies; Wherein, after the two rotating cover bodies rotate relative to the lifting cover body to a position for covering the light outlet, the second buffer member is located between the two rotating cover bodies.

19. The laser projection device according to any one of claims 14 to 17, characterized in that: The first transmission assembly includes: a rotating shaft, two transmission wheels and two transmission parts; The rotating shaft is fixed on the supporting seat, the two transmission wheels are sleeved on the rotating shaft and are rotatably connected with the rotating shaft. The two transmission wheels are respectively fixedly connected to the two rotating cover bodies, the two transmission wheels are respectively connected to the two transmission parts, and the two transmission parts are both connected to the first motor.

20. The laser projection device according to claim 19, characterized in that: The two transmission parts each include: a gear set, the transmission wheel meshes with a gear in the gear set, and there are two meshing gears in the two gear sets; The first transmission assembly further includes: a driving gear connected to the output shaft of the first motor, the driving gear meshing with a gear in the gear set.

21. The laser projection device according to any one of claims 13 to 17, characterized in that: The laser projection device further includes: a second driving assembly, which is respectively connected to the housing and the lifting cover, and is used to drive the lifting cover to move toward or away from the light outlet.

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