Laser projection equipment

Abstract

The invention provides laser projection equipment, which comprises a shell provided with a light outlet; the rotary cover body is arranged at the light outlet; the first driving assembly is connected with the rotary cover body and drives the rotary cover body to expose or seal the light outlet; the rotary sensing piece is connected with the first driving assembly; the detection piece corresponds to the rotary induction piece; and the controller corresponds to the rotating induction piece, the rotating induction piece is used for rotating along with the rotating cover body under the driving of the first driving assembly and making contact with the detection piece in the rotating process so as to trigger the detection piece to detect the rotating angle, and the controller controls starting and stopping of the first driving assembly according to the detection result. Therefore, the rotating cover body can be continuously detected by the detection piece in the rotating process, whether the rotating cover body rotates to a preset target position or not is ensured, and the situation that a flash gap at the rotating cover body is too large due to the fact that the rotating cover body does not rotate in place or rotates excessively, and a large amount of dust enters the shell and is attached to the surface of the lens is prevented. And the projection effect and image definition of the lens are influenced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of projection equipment, and in particular to a laser projection equipment. Background Art

[0002] Laser TV includes a laser projection device and a projection screen. The laser projection device includes a housing and a lens located inside the housing. The laser projection device emits a light beam to the projection screen through the lens to display the image. 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 cover is required to protect the lens. The protective cover automatically opens when the laser TV is turned on and used, so that the light 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.

[0003] The existing protective cover of laser projection equipment usually includes a light-transmitting part and a shielding part. The light-transmitting part is used to allow the projection 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 gap problem at the lens. For example, the existing protective cover usually includes multiple cover bodies, and the multiple cover bodies are used to protect the lens. Since there are a large number of cover bodies and each has an active and passive structure, a large number of structural parts are involved, which easily leads to a large cumulative processing error and it is difficult to achieve consistency between multiple cover bodies. In this way, when multiple cover bodies move relative to each other, the flash gap distance is easy to be different, and the flash gap distance is difficult to adjust, resulting in a poor appearance of the protective cover of the laser projection equipment. Summary of the invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a laser projection device.

[0005] The present disclosure provides a laser projection device, comprising:

[0006] A housing, wherein a projection host is disposed in the housing, and a light outlet is disposed on the housing for allowing a light beam emitted by the projection host to pass through;

[0007] A rotating cover body is arranged at the light outlet;

[0008] 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;

[0009] A rotating induction component connected to the first driving assembly;

[0010] A detection member, arranged corresponding to the rotation sensing member;

[0011] A controller, electrically connected to the detection element and the first driving assembly;

[0012] Wherein, the rotating sensing component is configured to rotate with the rotating cover body under the drive of the first driving component. During the rotation, the rotating sensing component contacts the detection component to trigger the detection component, so as to detect the rotation angle 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.

[0013] In some embodiments, the detection member includes a rotation sensor;

[0014] 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.

[0015] In some embodiments, 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;

[0016] 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.

[0017] In some embodiments, the laser projection device further includes a lifting cover and a second driving assembly;

[0018] The lifting cover is arranged at the light outlet;

[0019] 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 light beam transmitted through the light outlet or in the opposite direction of the light beam transmitted through the light outlet so as to move away from or closer to the light outlet;

[0020] 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 light beam passing through the light outlet.

[0021] In some embodiments, 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;

[0022] 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.

[0023] In some embodiments, the first driving assembly includes a first motor and a gear set drivingly connected to the first motor;

[0024] 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.

[0025] In some embodiments, the gear set includes 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;

[0026] 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.

[0027] In some embodiments, 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.

[0028] In some embodiments, the laser projection device further comprises:

[0029] 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;

[0030] 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.

[0031] In some embodiments, the lifting cover body includes a second cover plate and a second mounting plate connected;

[0032] 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.

[0033] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0034] The laser projection device provided by the present disclosure is characterized in that a projection host is installed in a housing, and a light outlet is provided on the housing, so that a light beam emitted by the projection host can be projected from the light outlet to a projection screen. A rotating cover is provided at the light outlet, and a first driving component is drivingly connected to the rotating cover, so that the rotating cover can rotate relative to the housing to expose the light outlet, so as to ensure that the light beam of the projection host can be projected to the projection screen; and the rotating cover is driven to rotate relative to the housing to cover the light outlet, so as to effectively protect the lens on the projection host. The rotation sensing member can rotate with the rotating cover body under the drive of the first driving component, so that the rotation sensing member responds to the rotation angle of the rotating cover body, and the rotation sensing member is configured to contact with the detection member during the rotation process to trigger the detection member, so as to detect the rotation angle of the rotating cover body through the detection member, so that the rotation process of the rotating cover body can be continuously detected by the detection member to ensure whether the rotating cover body is rotated to a preset target position, to prevent the rotating cover body from not rotating into place or rotating excessively, resulting in a large gap at the rotating cover body, so that a large amount of dust enters the shell 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 according to the detection result of the detection member, so as to control the static position of the rotating cover body, to prevent the first driving component from continuing to drive the rotating cover body to rotate after the rotating cover body rotates to the preset target position, resulting in excessive rotation of the rotating cover body, and can also prevent the first driving component from continuing to drive the rotating cover body to rotate after the rotating cover body is rotated into place, resulting in other problems caused by the continuous operation of the first driving component. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0037] Figure 1 This is a schematic structural diagram of a cover body in an embodiment of the present disclosure;

[0038] Figure 2 A bottom view of a cover body in an embodiment of the present disclosure;

[0039] Figure 3 A top view of a cover body in an embodiment of the present disclosure;

[0040] Figure 4 This is a structural schematic diagram of an embodiment of the present disclosure without the second driving assembly from the cover;

[0041] Figure 5 This is a structural schematic diagram of a first driving component in an embodiment of the present disclosure;

[0042] Figure 6 An exploded view of a rotating cover body in an embodiment of the present disclosure;

[0043] Figure 7 This is a structural schematic diagram of a lifting cover body in an embodiment of the present disclosure;

[0044] Figure 8 It is a structural schematic diagram of a second driving component from a perspective in an embodiment of the present disclosure;

[0045] Fig. 9 A schematic structural diagram of a second driving assembly from another perspective in an embodiment of the present disclosure;

[0046] Fig.10 It is a partial structural schematic diagram of the second drive assembly in an embodiment of the present disclosure.

[0047] Reference numerals:

[0048] 1. lifting cover body; 11. second cover plate; 12. second mounting plate; 13. side plate; 2. rotating cover body; 20. rotating bearing; 21. first cover plate; 22. first mounting plate; 23. supporting gasket; 3. second driving assembly; 31. second motor; 32. cam; 33. reinforcing block; 34. guide shaft; 341. limiter; 35. linear bearing; 351. connecting plate; 352. sliding sleeve; 36. spring; 4. first driving assembly; 41. first motor; 42. gear set; 421. first gear; 422. second gear; 423. third gear; 5. detecting member; 51. rotating sensing member; 52. first rotating sensor; 53. second rotating sensor; 6. mounting base; 71. first photoelectric switch; 72. second photoelectric switch; 81. first trigger plate; 82. second trigger plate. DETAILED DESCRIPTION

[0049] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0050] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0051] Laser TV is a projection display device that uses laser light source as display light source and cooperates with front projection display technology to form images. It is equipped with a dedicated projection screen and can receive broadcast and television programs or Internet television programs. Laser projection TV includes laser projection equipment and projection screen. The laser projection equipment can emit laser beams to the projection screen, and the projection screen reflects the beams to display the picture.

[0052] The projection screen may be an optical screen. Exemplarily, the projection screen may be composed of a support plate and a membrane located on the support plate. The membrane may be an optical membrane mainly composed of a Fresnel lens layer. For example, the membrane may 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 may 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, so that the user can view the image. Exemplarily, the support plate may be bonded to the membrane by an adhesive layer to fix and flatten the membrane. The adhesive layer may be a double-sided adhesive layer or a glue layer.

[0053] 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 light beam emitted by the lens is projected onto the projection screen, and 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 projection light 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 there are many structural parts involved in the multiple cover bodies, 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. For example, the protective shell in the prior art usually includes a 1 / 2 circular lifting cover and two 1 / 4 circular rotating covers. The two 1 / 4 circular rotating covers are driven by a parallelogram structure to rotate relative to or opposite to each other. In this way, when the two 1 / 4 circular rotating covers move relative to each other to form a 1 / 2 circular rotating cover, the gap distance is easy to be different, and the gap distance is difficult to adjust, resulting in poor appearance of the protective shell of the laser projection equipment. In addition, if the gap between multiple rotating shells is too large, the gap problem will be more serious, so that a large amount of dust will enter the shell and adhere to the surface of the lens, 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 will rub back and forth, forming a large number of scratches on the lens, affecting the projection effect and service life of the lens.

[0054] Based on this, some embodiments of the present disclosure provide a laser projection device, and the laser projection device is described in detail below through specific embodiments:

[0055] Reference Figures 1 to 10 As shown, the laser projection device provided by some embodiments of the present disclosure includes a housing, a rotating cover 2, a first driving assembly 4, a rotating sensing element 51, a detecting element 5 and a controller.

[0056] Among them, a accommodating cavity is formed in the shell, and a projection host is arranged in the accommodating cavity. The shell can protect the projection host and make the laser projection device form a complete machine. A light outlet (not shown in the figure) is formed on the shell wall of the shell, and the light outlet is used to transmit the light beam emitted by the projection host to realize the projection function. In the actual application process, the shell of the laser projection device can be rectangular as a whole, and a light outlet can be opened on the side wall of the shell so that the laser projection device emits a light beam from the side; or, a light outlet can be opened on the top of the shell so that the laser projection device emits a light beam from the top. It should be noted that in some other embodiments, the shell of the laser projection device can also be a hollow cylindrical structure as a whole.

[0057] Specifically, the rotation sensing member 51, the first driving assembly 4 and the detection member 5 are all located in the housing, the rotation sensing member 51 is connected to the first driving assembly 4, the detection member 5 is arranged corresponding to the rotation sensing member 51, and the controller (not shown in the figure) is electrically connected to the detection member 5 and the first driving assembly 4. Among them, the rotation sensing member 51 is configured to rotate with the rotating cover body 2 under the drive of the first driving assembly 4. The rotation sensing member 51 contacts the detection member 5 during the rotation process to trigger the detection member 5, so as to detect the rotation angle of the rotating cover body 2 through the detection member 5, and the controller controls the start and stop of the first driving assembly 4 according to the detection result of the detection member 5.

[0058] In summary, the laser projection device provided by the present disclosure is configured such that a projection host is installed inside a shell, and a light outlet is provided on the shell, so that a light beam emitted by the projection host can be projected from the light outlet to a projection screen. A rotating cover 2 is provided at the light outlet, and a first driving assembly 4 is drivingly connected to the rotating cover 2, so that the rotating cover 2 can rotate relative to the shell to expose the light outlet, so as to ensure that the light beam of the projection host can be projected to the projection screen; and the rotating cover 2 is driven to rotate relative to the shell to cover the light outlet, so as to effectively protect the lens on the projection host, prevent a large amount of dust and debris from adhering to the lens in the light outlet, affecting the projection clarity of the lens, and can prevent a large amount of dust and debris from scratching the lens surface, affecting the projection effect of the lens. And the rotation sensing member 51 can rotate 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 angle of the rotating cover body 2, and the rotation sensing member 51 is configured to contact with the detection member 5 during the rotation process to trigger the detection member 5, so as to detect the rotation angle 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, to prevent the rotating cover body 2 from not rotating into place or rotating excessively, resulting in too large a flash gap at the rotating cover body 2, so that a large amount of dust enters the shell and adheres to the surface of the lens, 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, so as to control the static position of the rotating cover body 2, to avoid that after the rotating cover body 2 rotates to the preset target position, the first driving component 4 continues to drive the rotating cover body 2 to rotate, resulting in excessive rotation of the rotating cover body 2, and can also prevent that after the rotating cover body 2 rotates into place, the first driving component 4 continues to drive the rotating cover body 2 to rotate, resulting in other problems caused by the continuous operation of the first driving component 4.

[0059] 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 along the rotation direction can contact the rotation sensor to trigger the rotation sensor, and the rotation sensing member 51 continues to contact the rotation sensor until the other end of the rotation sensing member 51 along the rotation direction leaves the rotation sensor.

[0060] In a specific implementation, the rotating sensing component 51 can have an arc-shaped outer contour surface, that is, the edge of the rotating sensing component 51 is arc-shaped. During the rotation of the rotating sensing component 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 component 51.

[0061] It should be noted that the specific curvature of the outer contour surface of the rotating sensing component 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 component 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 component 51. As long as the rotating sensing component 51 can continuously trigger the rotation sensor as the rotating cover body 2 rotates, the rotation sensor can continuously detect the rotation angle of the rotating cover body 2.

[0062] 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 rotating sensor is not limited to an arc surface. As long as the rotating sensing component 51 can contact the rotating sensor when it rotates to a certain position, and maintain contact with the rotating sensor for a certain period of time during the rotation process, and then separate from the rotating sensor and no longer contact it, it will be sufficient.

[0063] 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 arranged at intervals and are electrically connected to the controller respectively. When the rotation sensing member 51 rotates, the first rotation sensor 52 and the second rotation sensor 53 can be triggered in sequence, so as to control the rotation 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 one 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 other 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.

[0064] In some embodiments, reference Figures 2 to 5 As shown, the laser projection device further includes a lifting cover 1. In order to improve the appearance of the laser projection device, the lifting cover 1 and the rotating cover 2 are both arranged at the light outlet. The number of the rotating cover 2 can be one, two or three. The first driving assembly 4 drives the plurality of rotating covers 2 to rotate relative to the lifting cover 1 to expose or cover the light outlet.

[0065] In addition, the laser projection device further includes a second driving assembly 3, which is disposed in the housing and connected to the lifting cover body 1. The second driving assembly 3 is used to drive the lifting cover body 1 to move relative to the housing in the direction of the light beam transmitted from the light outlet or in the opposite direction of the light beam to move away from or close to the light outlet, so as to achieve exposure and shielding protection of the light outlet. The first driving assembly 4 is used to drive the rotating cover body 2 to rotate to the inside of the lifting cover body 1 to expose the light outlet, or to drive the rotating cover body 2 to rotate out from the inside of the lifting cover body 1 to cover the light outlet when the lifting cover body 1 moves to a preset position relative to the housing in the direction of the light beam transmitted from the light outlet.

[0066] In some embodiments, reference Figure 1 As shown, there is only one rotating cover body 2, and both the lifting cover body 1 and the rotating cover body 2 are semicircular structures, and the lifting cover body 1 and the rotating cover body 2 are assembled together to form a circular cover structure to shield and protect the light outlet.

[0067] The first driving assembly 4 is arranged in the shell and connected to the rotating cover body 2, and is used for driving the rotating cover body 2 to rotate relative to the shell along a first direction and rotate to the inside of the lifting cover body 1 to expose the light outlet, so that the light beam of the projection host can pass through the light outlet to the projection screen, and driving the rotating cover body 2 to rotate relative to the shell 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, so as to prevent the lens in the light outlet from being scratched by external force or being attached with a large amount of dust.

[0068] 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 matching tolerance due to the large number of structural parts of the rotating cover body 2, and improves the compatibility 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 can be formed, so that the appearance of the entire cover body has higher integrity and is smoother and more beautiful, and solves the problem that when there are multiple rotating cover bodies 2, there are many structural parts involved, and the cumulative processing error is large, resulting in insufficient consistency between the rotating cover body 2 and the lifting cover body 1 after assembly, causing flash gaps between the rotating cover body 2 and the lifting cover body 1.

[0069] In some embodiments, reference Figures 2 to 5 As shown, the first driving assembly 4 includes a first motor 41 and a gear set 42 drivingly connected to the first motor 41. A rotating bearing 20 is provided on the rotating cover body 2, and the gear set 42 is cooperatively connected to the rotating bearing 20. The first motor 41 drives the rotating cover body 2 to rotate through the gear set 42, so as to rotate the rotating cover body 2 relative to the housing in a first direction and rotate it to the inside of the lifting cover body 1 to expose the light outlet, and rotate the rotating cover body 2 relative to the housing in the opposite direction of the first direction and rotate it out from the inside of the lifting cover body 1 to cover the light outlet.

[0070] Exemplarily, the gear set 42 may include two or more gears meshing with each other. When the gear set 42 includes two gears meshing with each other, one gear is drivingly connected to the output shaft of the first motor 41, and the other gear is connected to the rotating cover 2. The first motor 41 drives the two gears to realize the rotation of the rotating cover 2. Figure 2As shown, in some embodiments, the gear set 42 includes a first gear 421, a second gear 422, and a third gear 423 that mesh in sequence, the first gear 421 is connected to the output shaft of the first motor 41, the second gear 422 meshes with the first gear 421 and the third gear 423 respectively, and the third gear 423 is connected with the rotary 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 size of the second gear 422 and the third gear 423 increases 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 operating stability and reliability of the rotating cover body 2 are high, and the operating noise is low, 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. 。

[0071] It should be noted that the above-mentioned limitation on the first driving assembly 4 is only an exemplary setting mode, and does not constitute a limitation on the protection scope of the present disclosure. In actual application, the first driving assembly 4 can also realize the rotation of the rotating cover body 2 through other transmission mechanisms. For example, the first driving assembly 4 can also include a motor and a connecting rod mechanism connected to the motor in a transmission manner, and the connecting rod mechanism can include a plurality of connecting rods hinged to each other. The connecting rod mechanism can be connected to the rotating cover body 2 in a transmission manner, and the rotation of the rotating cover body 2 can also be realized by driving the connecting rod mechanism with the motor.

[0072] In some embodiments, reference Figure 4 As shown, specifically, the rotating sensing component 51 is a sheet-like or plate-like structure, and the rotating sensing component 51 is fan-shaped as a whole. For example, the rotating sensing component 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 component 5 during the rotation of the rotating sensing component 51 to trigger the detection component 5.

[0073] Specifically, the rotation sensing member 51 has a first end and a second end located at both ends of the fan-shaped structure. The rotation sensing member 51 is fixed on the second gear 422, and the first rotation sensor 52 and the second rotation sensor 53 are respectively located on both sides of the second gear 422. The rotation sensing member 51 rotates along the rotation path along with the rotating cover 2. The first rotation sensor 52 and the second rotation sensor 53 are respectively set corresponding to the two sides of the rotation sensing member 51 and along the rotation path, so that one end of the rotation sensing member 51 triggers one of the sensors and rotates along the sensor during the rotation process, and when the end leaves the sensor, the other end can immediately trigger another sensor and rotate along the other sensor to ensure that the rotation sensing member rotates to the target position within one rotation cycle. In other words, when the end of the rotation sensing member 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.

[0074] Specifically, when the lifting cover 1 completes the lifting action, the rotating cover 2 rotates along the first direction (i.e., the horizontal direction) under the drive of the first motor 41, and the rotating cover 2 can rotate clockwise or counterclockwise to the inside of the lifting cover 1. Since the rotating induction member 51 is a quarter-circular structure, the angle between the two ends of the rotating induction member 51 is 90°. Figure 5As shown, when the rotating sensing member 51 rotates, one end of the rotating sensing member can trigger the first rotating sensor 52 and continue to rotate along the first rotating sensor 52. At this time, the signal of the first rotating sensor 52 changes from ON to 90°, until the end leaves the first rotating sensor 52. At this time, the other end of the rotating sensing member 51 directly enters the second rotating sensor 53 and triggers the second rotating sensor 53. At this time, the signal of the first rotating sensor 52 changes to OFF, and the signal of the second rotating sensor 53 changes to ON. The rotating sensing member 51 continues to rotate along the second rotating sensor 53 until the other end of the rotating sensing member 51 leaves the second rotating sensor 53. At this time, the signal of the second rotating sensor 53 changes to 90°→OFF. Through the above-mentioned triggering and rotating process of the rotating sensing member 51 and the first rotating sensor 52 and the second rotating sensor 53, it can be ensured 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, so as to expose the light outlet 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, the detection error is large and in some cases, when the rotation sensing member 51 has not rotated to the right position, the sensor signal may directly change from ON to OFF. Compared with only one sensor detecting whether the rotation is in place, the detection accuracy of setting two sensors in this embodiment is higher.

[0075] It should be noted that, due to the inevitable errors in the respective processing and assembly stages of the lifting cover body 1 and the rotating cover body 2, there will be a gap problem between the lifting cover body 1 and the rotating cover body 2 after the two are assembled in the factory stage. Therefore, in the factory debugging stage, only when the detection logic that the first rotation sensor 52 and the second rotation sensor 53 both detect that the rotating sensing member 51 rotates 90° is satisfied, 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 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 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 debugging personnel detect that there is a significant angle between the lifting cover 1 and the rotating cover 2 or the gap between the two is not flush, it proves that there is a gap problem between the lifting cover 1 and the rotating cover 2, which will cause a large amount of dust to enter the housing through the gap between the two covers and adhere to the lens surface, affecting the projection effect and image clarity of the lens, and the dust attached to the lens is easy to scratch the lens. At this time, the debugging personnel need to continue to drive the rotating cover 2 to rotate according to the location of the gap, so as to solve the gap problem between the lifting cover 1 and the rotating cover 2.

[0076] 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°. At this time, after confirming that the rotating cover body 2 has been driven to rotate to 180°, 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 assembled 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 to the left by a certain angle. For example, 1°, 2°, 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°, 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 rotating cover body 2 can be rotated to the right by directly running the rotation angle maintained this time. It should be noted that the specific rotation angle of each rotating cover body 2 that has completed the debugging is different. For example, some rotating cover bodies 2 only need to rotate 178° to rotate to the right, and some rotating cover bodies 2 need to rotate 182° to rotate to the right.

[0077] 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, first drive the gear set 42 through the first motor 41 to drive the rotating cover 2 to rotate, so that the rotating 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°, and then according to the rotation debugging program saved by the laser projection device last time, drive the rotating sensing member 51 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 and the gap is small; the second debugging method is to directly drive the rotating cover 2 to rotate according to the final rotation angle through 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, so as to rotate the rotating cover 2 to the right position at one time, and in this debugging method, only the rotation sensor at the starting position is turned on, that is, the rotating 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.

[0078] Both of the above-mentioned two adjustment methods can ensure that the rotating cover body 2 rotates into place relative to the lifting cover body 1, and the flash gap between the lifting cover body 1 and the rotating cover body 2 is reduced as much as possible, ensuring that the lifting cover body 1 and the rotating cover body 2 are more adapted, 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 flash 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 check 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.

[0079] It should be noted that, in actual application, the detection member 5 can also be configured as other detection components. Exemplarily, the detection member 5 can also include only one sensor and one 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, and when the sensor detects that the rotation sensing member rotates a preset angle, the first motor 41 is controlled to stop.

[0080] In some embodiments, reference Figure 6 As shown, the rotating cover body 2 includes a first mounting plate 22 and a first cover plate 21 attached to the first mounting plate 22, and the first driving assembly 4 is connected to the first mounting plate 22. Exemplarily, the rotating bearing 20 is fixed on the first mounting plate 22, and a plurality of supporting 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 specifications of the flash seam and the step difference, 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 supporting gaskets 23, that is, the relative height and parallelism of the first cover plate 21 are adjusted through the plurality of supporting gaskets 23, so as to reduce the step difference problem caused by the cumulative error of the structural parts.

[0081] In some embodiments, reference Figure 7 As shown, the laser projection device further includes a mounting base 6, which is located in the housing, and 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 body 1 and the rotating cover body 2 respectively, the movement of the two covers can be driven respectively, the structure has good stability, and the installation and maintenance are simple.

[0082] Exemplarily, the laser projection device further includes a first photoelectric switch 71 and a second photoelectric switch 72, both of which are arranged in the housing, 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 arranged on the lifting cover body 1, and the first trigger plate 81 is configured as follows: when the laser projection device is turned on and starts to work, when the second drive assembly 3 drives the lifting cover body 1 to rise to the target position in the direction away from the light outlet, the first trigger plate 81 triggers the first photoelectric switch 71, at which time the second drive assembly 3 stops driving, and the second drive assembly 3 starts to drive the rotating cover body 2 to rotate through the gear set 42 until the rotating cover body 2 rotates along the first direction to the inside of the lifting cover body 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 direction close to the light outlet, 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.

[0083] 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 was not completely assembled 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 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 the dust attached to the lens is easy to scratch the lens. The debugging personnel can use the 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 in place, so as to reduce 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 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.

[0084] Exemplarily, the lifting cover body 1 can be in the shape of a flat plate, parallel to the top cover of the shell; or, the lifting cover body 1 can also be composed of a top plate and side plates connected to each other to completely close the first accommodating cavity to ensure a dustproof effect. Another exemplary embodiment, the lifting cover body 1 can be a thin-walled part, which can not only reduce the occupied space and facilitate avoiding other parts of the laser projection equipment, but also be visually regarded as a part of the shell, so that the overall aesthetics of the laser projection equipment is 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 the cost while improving the overall aesthetics of the cover body.

[0085] On this basis, the transmission mechanism of the second drive assembly 3 is transmission-connected with the second motor 31 and the lifting cover body 1, and the transmission mechanism is used to drive the lifting cover body 1 to approach or move away from the light outlet in a direction perpendicular to the shell. Among them, 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 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 lead screw is coaxially fixedly connected with 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 used. In this way, the second motor 31 can be driven by the transmission mechanism to drive the lifting cover body to approach or move away from the light outlet in a direction perpendicular to the top cover of the shell.

[0086] In some embodiments, reference Figures 7 to 10 As shown, 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, the reinforcement block 33 is connected to the lifting cover body 1 through a threaded connector, 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.

[0087] 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, 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 is 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 in a direction perpendicular to the top cover of the shell, and the lifting cover body 1 can be moved smoothly.

[0088] For example, Fig.10As shown, the guide member includes a guide shaft 34, which is disposed in the housing, and the guide shaft 34 passes through the second mounting plate 12. Exemplarily, the end of the guide shaft 34 away from the light outlet can be directly connected to the housing; or, the end of the guide shaft 34 away from the light outlet can also be indirectly connected to the housing through a structure such as a mounting base 6. On this basis, the second driving assembly 3 also includes a linear bearing 35, which is fixedly connected to the second mounting plate 12, and at least part of the linear bearing 35 is 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 side wall of the sliding sleeve 352, the connecting plate 351 may be connected to the second mounting plate 12 through a threaded connector, and 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, so that the second mounting plate 12 can be prevented from directly contacting and rubbing with the guide shaft 34 to accelerate the wear of the second mounting plate 12, and at the same time, the resistance to the movement of the lifting cover body 1 can be reduced, so as to facilitate the driving of the lifting cover body 1 to move. Exemplarily, the number of the guide shaft 34 and the linear bearing can be two, which are symmetrically arranged on both sides of the axis of the cam 32, so that the movement of the lifting cover body 1 can be more stable. In order to ensure the reliability of the movement of the lifting cover body 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, which is sleeved on the guide shaft 34, and the two ends of the open collar are connected by a threaded connector to fix the open collar on the guide shaft 34. In this way, the position of the stopper 341 on the guide shaft 34 can be adjusted as needed, and the adjustment and disassembly are convenient, and the applicability is strong. It should be noted that in other embodiments, the stopper 341 can also be a sleeve with an interference fit with the guide shaft 34, which can also be used. On this basis, the spring 36 is sleeved on the guide shaft 34, and the two ends of the spring 36 are respectively in contact with the second mounting plate 12 and the stopper 341. In this way, when the lifting cover 1 needs to be moved close to the light outlet (or the bottom wall of the shell) in a direction perpendicular to the top wall of the shell, the lifting cover 1 will move in the direction close to the light outlet under the elastic force of the spring 36, ensuring the reliability of the movement of the lifting cover 1, and further ensuring that the surface of the lifting cover 1 facing the outside of the shell is coplanar with the surface of the rotating cover 2 facing the outside of the shell, so that the appearance of the laser projection device is good. Exemplarily, when the number of guide shafts 34 is two, the number of limiters 341 and springs 36 is two, and the limiters 341 correspond to the springs 36 one by one, so that the movement of the lifting cover 1 is smoother.

[0089] In some embodiments, reference Figure 7As shown, the lifting cover body 1 also includes a side plate 13 connecting the second cover plate 11 and the second mounting plate 12. The side plate 13, the second cover plate 11 and the second mounting plate 12 are arranged to form a 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 exposing the light outlet, 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, and the space occupied by the rotating cover body 2 when rotating is small, thereby ensuring the overall aesthetics of the cover body.

[0090] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0091] The above are only specific embodiments of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A laser projection device, characterized in that: include: A housing, wherein a projection host is disposed in the housing, and a light outlet is disposed on the housing for allowing a light beam emitted by the projection host 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 induction component connected to the first driving assembly; 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 rotating sensing component is configured to rotate with the rotating cover body under the drive of the first driving component. During the rotation, the rotating sensing component contacts the detection component to trigger the detection component, so as to detect the rotation angle 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 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.

3. The laser projection device according to claim 2, 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.

4. The laser projection device according to any one of claims 1 to 3, 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 light beam transmitted through the light outlet or in the opposite direction of the light beam transmitted through the light outlet so as to move away from or closer 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 light beam passing through the light outlet.

5. The laser projection device according to claim 4, 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.

6. The laser projection device according to claim 5, 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.

7. The laser projection device according to claim 6, 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.

8. The laser projection device according to claim 4, 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.

9. The laser projection device according to claim 4, 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.

10. The laser projection device according to claim 4, 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.

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