Laser projection device

Abstract

The present disclosure provides a laser projection device, comprising: a shell, the shell is provided with a light outlet; a rotating cover is arranged at the light outlet; a first driving assembly is connected with the rotating cover to drive the rotating cover to expose or cover the light outlet; a rotating induction piece is connected with the first driving assembly; a detection piece corresponds to the rotating induction piece; a controller corresponds to the rotating induction piece, the rotating induction piece is used to rotate with the rotating cover under the driving of the first driving assembly, and contacts with the detection piece in the rotating process to trigger the detection piece to detect the rotating angle, and the controller controls the start and stop of the first driving assembly according to the detection result. The rotating process of the rotating cover can be continuously detected by the detection piece, so as to ensure whether the rotating cover rotates to the preset target position, prevent the rotating cover from not rotating to the position or rotating excessively, cause the flash gap at the rotating cover to be too large, cause a large amount of dust to enter the shell and adhere to the lens surface, and affect the projection effect and image definition of the lens.

Description

TECHNICAL FIELD

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

[0002] The laser television comprises a laser projection equipment and a projection screen. The laser projection equipment comprises a shell and a lens located in the shell. The laser projection equipment emits a light beam through the lens to the projection screen to display a picture. Since the lens of the laser projection equipment is a precision component, in order to prevent the lens inside the laser projection equipment from being scratched by external force or falling into dust, a protective cover is needed to protect the lens. The protective cover is automatically opened when the laser television is started to use, so that the light beam emitted by the lens is projected to the projection screen. The protective cover is automatically closed in the state of the laser television being turned off to protect the lens.

[0003] The existing protective cover of the laser projection equipment generally comprises a light-transmitting part and a shielding part. The light-transmitting part is used for transmitting the projection light beam, and the shielding part is used for shielding the lens. When the expected shielding part of the protective cover is not rotated in place during use, a flash gap problem will occur at the lens. For example, the existing protective cover generally comprises a plurality of cover bodies which cooperate to protect the lens. Since the number of cover bodies is large and each cover body has a driving structure and a driven structure, the number of structural parts involved is large, which is easy to cause large machining cumulative error and difficult to realize the consistency between the plurality of cover bodies. In this way, the flash gap distance is easy to be different when the plurality of cover bodies move relatively, and the flash gap distance is difficult to adjust, resulting in poor appearance effect of the protective cover of the laser projection equipment. SUMMARY

[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 equipment.

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

[0006] A shell is provided with a projection host inside. The shell is provided with a light outlet for the light beam emitted by the projection host to transmit.

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

[0008] A first driving assembly is connected with the rotating cover body and used for driving the rotating cover body to rotate relative to the shell to expose or cover the light outlet.

[0009] A rotating sensing piece is connected with the first driving assembly.

[0010] A detection piece is arranged correspondingly with the rotating sensing piece.

[0011] A controller is electrically connected with the detection piece and the first driving assembly.

[0012] The rotating sensing member is configured to rotate with the rotating cover under the driving of the first driving assembly, and the rotating sensing member is in contact with the detecting member during rotation to trigger the detecting member, so as to detect the rotation angle of the rotating cover through the detecting member, and the controller controls the start and stop of the first driving assembly according to the detection result of the detecting member.

[0013] In some embodiments, the detecting member includes a rotating sensor;

[0014] During the rotation of the rotating sensing member, one end of the rotating sensing member in the rotation direction can be in contact with the rotating sensor to trigger the rotating sensor, and the rotating sensing member continuously contacts the rotating sensor until the other end of the rotating sensing member in the rotation direction is away from the rotating sensor.

[0015] In some embodiments, the number of rotating sensors is two, which are a first rotating sensor and a second rotating sensor, and the first rotating sensor and the second rotating sensor are arranged at intervals;

[0016] During the rotation of the rotating sensing member, when one end of the rotating sensing member at the front end in the rotation direction is in contact with one of the first rotating sensor and the second rotating sensor, the other end of the rotating sensing member at the rear end in the rotation direction is away from the other one of the first rotating sensor and the second rotating 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 with the lifting cover, and is used to drive the lifting cover to move relative to the shell along the direction in which the light beam is transmitted through the light outlet or the opposite direction to the light outlet to move away from or close to the light outlet;

[0020] The first driving assembly is used to drive the rotating cover to rotate to the inside of the lifting cover to expose the light outlet or to rotate out of the inside of the lifting cover to cover the light outlet when the lifting cover moves relative to the shell along the direction in which the light beam is transmitted through the light outlet to the preset position.

[0021] In some embodiments, the rotating cover and the lifting cover are both in a semicircular structure, and the rotating cover and the lifting cover jointly form a circular cover structure;

[0022] The first driving assembly is configured to drive the rotary cover to rotate relative to the shell in a first direction and into the interior of the lifting cover, and to rotate relative to the shell in the opposite direction of the first direction and out of the interior of the lifting cover.

[0023] In some embodiments, the first driving assembly comprises a first motor and a gear set in transmission connection with the first motor.

[0024] The rotary cover is provided with a rotary bearing, and the gear set is in matching connection with the rotary bearing. The first motor drives the rotary cover to rotate through the gear set.

[0025] In some embodiments, the gear set comprises a first gear, a second gear and a third gear in sequence. The first gear is connected with the output shaft of the first motor. The second gear is in meshing connection with the first gear and the third gear respectively. The third gear is in matching connection with the rotary bearing.

[0026] The rotary sensing member is in a fan-shaped structure. The center of the fan-shaped structure is connected with the rotation center of the second gear and rotates with the second gear. The arc-shaped outer contour surface of the fan-shaped structure is in contact with the detection member to trigger the detection member during the rotation of the rotary sensing member.

[0027] In some embodiments, the rotary cover comprises a first mounting plate and a first cover plate attached to the first mounting plate. The first driving assembly is connected with the first mounting plate. A plurality of supporting spacers 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 and the parallelism of the first cover plate relative to its rotation direction through the plurality of supporting spacers.

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

[0029] A first photoelectric switch and a second photoelectric switch are arranged in the shell. The first photoelectric switch is in electrical connection with the second driving assembly.

[0030] A first trigger plate and a second trigger plate are arranged on the lifting cover. The first trigger plate is configured to trigger the first photoelectric switch when the second driving assembly drives the lifting cover to rise to a target position away from the light outlet. The second trigger plate is configured to trigger the second photoelectric switch when the second driving assembly drives the lifting cover to descend to an initial position close to the light outlet.

[0031] In some embodiments, the lifting cover comprises a second cover plate and a second mounting plate connected with each other.

[0032] The second driving assembly comprises a second motor, a cam and a guide shaft, the cam is connected with an output shaft of the second motor, a rim of the cam abuts against the second mounting plate, the guide shaft is arranged through the second mounting plate along a height direction of the lifting cover body, the lifting cover body and the guide shaft are in sliding connection, an end of the guide shaft close to the second cover plate is sleeved with a limiting piece, the guide shaft is sleeved with an elastic piece at a position between the limiting piece and the second mounting plate, and two ends of the elastic piece abut against the second mounting plate and the limiting piece respectively.

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

[0034] The laser projection device provided by the present disclosure installs the projection host in the shell, and the shell is provided with a light outlet, so that the light beam emitted by the projection host can be projected to the projection screen from the light outlet. The rotating cover is arranged at the light outlet, the first driving assembly is drivingly connected with the rotating cover, so that the rotating cover 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 is driven to rotate relative to the shell to cover the light outlet, thereby effectively protecting the lens on the projection host. And the rotating sensing piece can rotate with the rotating cover under the driving of the first driving assembly, so that the rotating sensing piece reacts to the rotation angle of the rotating cover. The rotating sensing piece is configured to contact the detection piece during rotation to trigger the detection piece, so as to detect the rotation angle of the rotating cover through the detection piece. The rotation process of the rotating cover can be continuously detected by the detection piece, so as to ensure whether the rotating cover rotates to the preset target position. The rotating cover is prevented from rotating too much, which causes the flash gap at the rotating cover to be too large, 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 assembly according to the detection result of the detection piece, so as to control the stationary position of the rotating cover. The rotating cover is prevented from rotating too much after rotating to the preset target position, and the first driving assembly is prevented from continuously driving the rotating cover to rotate after the rotating cover rotates to the position, so as to prevent the first driving assembly from continuously running to cause other problems. BRIEF DESCRIPTION OF DRAWINGS

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

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0037] Figure 1 A structure diagram of a cover in an embodiment of the present disclosure;

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

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

[0040] Figure 4 A structure diagram of the cover without a second driving assembly in an embodiment of the present disclosure;

[0041] Figure 5 A structure diagram of a first driving assembly in an embodiment of the present disclosure;

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

[0043] Figure 7 A structure diagram of a lifting cover in an embodiment of the present disclosure;

[0044] Figure 8 A structure diagram of a second driving assembly from one perspective in an embodiment of the present disclosure;

[0045] Figure 9 A structure diagram of the second driving assembly from another perspective in an embodiment of the present disclosure;

[0046] Figure 10 A partial structure diagram of the second driving assembly in an embodiment of the present disclosure.

[0047] Reference signs:

[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, support gasket; 3, second driving assembly; 31, second motor; 32, cam; 33, reinforcing block; 34, guide shaft; 341, limiting piece; 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, detection piece; 51, rotating inductive piece; 52, first rotation sensor; 53, second rotation 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 enable a more clear understanding of the above-mentioned objects, features and advantages of the present disclosure, the schemes 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, a large number of specific details are set forth in order to facilitate a thorough understanding of the present disclosure, but the present disclosure can also be implemented in other manners different from those described herein; obviously, the embodiments described in the specification are only a part of the embodiments of the present disclosure, and not all the embodiments.

[0051] The laser television is a projection display device using a laser light source as a display light source and cooperating with a front projection display technology to image, equipped with a special projection screen, which can receive broadcast television programs or Internet television programs. The laser projection television includes a laser projection device and a projection screen. The laser projection device can emit a laser beam to the projection screen, and the projection screen reflects the light beam to realize the display of the picture.

[0052] The projection screen can be an optical screen. For example, the projection screen can be composed of a support plate and a film sheet located on the support plate. The film sheet can be an optical film sheet mainly composed of a Fresnel lens layer. For example, the film sheet can include a diffusion layer, a substrate layer and a Fresnel lens layer which are sequentially stacked away from the laser projection device (or the film sheet can include a substrate layer, a diffusion layer and a Fresnel lens layer which are sequentially stacked). The substrate layer is a transparent film layer. When the image is displayed, the light beam is emitted from the laser projection device, dispersed by the diffusion layer, and then reflected on the surface of the Fresnel lens layer, so that the user can watch the image. For example, the support plate can be bonded with the film sheet by an adhesive layer to fix and flatten the film sheet. The adhesive layer can 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 force or falling into dust, a protective shell needs to be provided to protect the lens. The protective cover is automatically opened when the laser television is started to use, so that the light beam emitted by the lens is projected to the projection screen, and is automatically closed in the state of the laser television being 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 for transmitting the projection light beam, and the shielding part is used for shielding the lens. When the shielding part of the protective cover is not rotated in place during use, a flash gap problem will occur at the lens. The existing protective shell of the laser projection device is a circular structure, which can be a complete circular shell structure, or a circular shell structure formed by multiple cover bodies. Since multiple cover bodies involve many structural parts, it is easy to cause large machining cumulative error, and the consistency after assembly is insufficient, which causes the protective shell to have a flash gap problem. For example, the existing protective shell usually includes a 1 / 2 circular lifting cover and two 1 / 4 circular rotating covers. The two 1 / 4 circular rotating covers are driven to rotate relatively or oppositely through a parallelogram structure. In this way, the flash gap distance of the two 1 / 4 circular rotating covers is easy to be different when they are relatively moved to form a 1 / 2 circular rotating cover, and the flash gap distance is difficult to adjust, which causes the appearance effect of the protective shell of the laser projection device to be poor. Moreover, the gap between the multiple rotating shells is too large, which causes the flash gap problem to be more serious, so that a large amount of dust enters the shell and adheres to the surface of the lens, which affects the projection effect and image clarity of the lens. Moreover, the dust and impurities adhered to the lens are more, and when the lens is cleaned, the dust and impurities rub back and forth to form a large number of scratches on the lens, which affects the projection effect and service life of the lens.

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

[0055] Referring to Figures 1 to 10 The laser projection device provided by some embodiments of the present disclosure includes a shell, a rotating cover body 2, a first driving assembly 4, a rotating sensing piece 51, a detection piece 5 and a controller.

[0056] The shell is internally formed with a containing cavity, the containing cavity is internally provided with a projection host, the shell can protect the projection host, and the laser projection device forms a complete machine. The shell wall of the shell is formed with a light outlet (not shown in the figure), the light outlet is used for transmitting the light beam emitted by the projection host to realize the projection function. In actual application process, the shell of the laser projection device can be in a rectangular shape, the light outlet can be arranged on the side wall of the shell, so that the laser projection device emits the light beam from the side; or the light outlet can also be arranged on the top of the shell, so that the laser projection device emits the light beam from the top. It should be noted that the shell of the laser projection device can also be in a hollow cylindrical structure in other embodiments.

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

[0058] In summary, the laser projection device provided by the present disclosure has the following advantages. The projection host is installed inside the shell, and the shell is provided with a light outlet, so that the light beam emitted by the projection host can be projected to the projection screen from the light outlet. The rotating cover 2 is arranged at the light outlet, and the first driving assembly 4 is drivingly connected with the rotating cover 2, so that the rotating cover 2 can rotate relative to the shell to expose the light outlet, thereby ensuring that the light beam of the projection host can be projected to the projection screen. In addition, the rotating cover 2 can be driven to rotate relative to the shell to cover the light outlet, thereby effectively protecting the lens on the projection host. This can prevent a large amount of dust and debris from adhering to the lens in the light outlet, thereby affecting the projection clarity of the lens. In addition, a large amount of dust and debris can scratch the surface of the lens, thereby affecting the projection effect of the lens. In addition, the rotating sensing part 51 can rotate with the rotating cover 2 under the driving of the first driving assembly 4, so that the rotating sensing part 51 reacts to the rotation angle of the rotating cover 2. The rotating sensing part 51 is arranged to contact the detection part 5 during rotation to trigger the detection part 5. The rotation angle of the rotating cover 2 can be detected by the detection part 5, so that the rotation process of the rotating cover 2 can be continuously detected by the detection part 5. This can ensure whether the rotating cover 2 rotates to the preset target position or not, thereby preventing the rotating cover 2 from rotating excessively or not rotating to the position, which can cause the flash gap of the rotating cover 2 to be too large, so that a large amount of dust enters the shell and adheres to the surface of the lens, thereby affecting the projection effect and image clarity of the lens. In addition, the controller can control the start and stop of the first driving assembly 4 according to the detection result of the detection part 5, thereby controlling the stationary position of the rotating cover 2. This can prevent the first driving assembly 4 from continuing to drive the rotating cover 2 to rotate after the rotating cover 2 rotates to the preset target position, thereby preventing the rotating cover 2 from rotating excessively. In addition, this can also prevent the first driving assembly 4 from continuously driving the rotating cover 2 to rotate after the rotating cover 2 rotates to the position, thereby preventing the first driving assembly 4 from continuously running and causing other problems.

[0059] In some embodiments, the detection part 5 includes a rotation sensor. During the rotation process of the rotating sensing part 51, one end of the rotating sensing part 51 in the rotation direction can contact the rotation sensor to trigger the rotation sensor. The rotating sensing part 51 continuously contacts the rotation sensor until the other end of the rotating sensing part 51 in the rotation direction leaves the rotation sensor.

[0060] In specific implementations, the rotating sensing part 51 can have a circular arc-shaped outer contour surface, that is, the edge of the rotating sensing part 51 is circular arc-shaped. During the rotation process of the rotating sensing part 51, the outer contour surface is always in contact with the rotation sensor, thereby ensuring that the rotation sensor can continuously detect the rotation angle of the rotating sensing part 51.

[0061] It should be noted that the specific curvature of the outer profile surface of the rotation sensing part 51 can be set according to the need to detect the rotation angle of the rotating cover 2, for example, the rotation sensing part 51 can be set to a semicircular or 1 / 4 sector structure, and the specific setting position of the rotation sensor can also be adapted according to the rotation sensing part 51, as long as the rotation sensing part 51 can continuously trigger the rotation sensor during the rotation of the rotating cover 2, so that the rotation sensor can continuously detect the rotation angle of the rotating cover 2.

[0062] Of course, the rotation sensing part 51 is not limited to having a circular arc-shaped outer profile surface, that is, the surface of the rotation sensing part 51 for contacting the rotation sensor is not limited to a circular arc surface, as long as the rotation sensing part 51 can be contacted with the rotation sensor when it is rotated to a certain position, and continuously contacted with the rotation sensor for a certain time during the rotation, and then separated from the rotation sensor and no longer contacted.

[0063] The number of rotation sensors is two, which are a first rotation sensor 52 and a second rotation sensor 53, the first rotation sensor 52 and the second rotation sensor 53 are arranged in a spaced manner and are electrically connected with the controller, and the rotation sensing part 51 can sequentially trigger the first rotation sensor 52 and the second rotation sensor 53 when rotating, so as to realize the control of the rotation position of the rotation sensing part 51 and the rotating cover 2 through the first rotation sensor 52 and the second rotation sensor 53. Specifically, in the rotation process of the rotation sensing part 51, when one end of the outer profile surface located at the front end of the rotation direction is in contact with one of the first rotation sensor 52 and the second rotation sensor 53, the other end of the outer profile surface located at the rear end of the rotation direction is away from the other one of the first rotation sensor 52 and the second rotation sensor 53.

[0064] In some embodiments, referring to Figures 2 to 5 As shown in the figure, the laser projection device further comprises 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 rotating covers 2 can be one or two, three, and the first driving assembly 4 is used to drive the plurality of rotating covers 2 to rotate relative to the lifting cover 1 to expose or shield the light outlet.

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

[0066] In some embodiments, referring to Figure 1 As shown, the number of rotating cover bodies 2 is one, and 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 jointly spliced into a circular cover body structure to shield the light outlet.

[0067] The first driving assembly 4 is arranged in the shell and connected with the rotating cover body 2, for driving the rotating cover body 2 to rotate relative to the shell in 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 be transmitted to the projection screen through the light outlet, and for driving the rotating cover body 2 to rotate relative to the shell in the opposite direction of the first direction and rotate out of 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 from being covered with a large amount of dust.

[0068] Furthermore, the rotating cover body 2 is a semicircular integrated structure, which greatly reduces the machining cumulative error of the rotating cover body 2, reduces the probability of large flash seams caused by large cumulative tolerance of the structure of multiple rotating cover bodies 2, and improves the fitting degree 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 jointly spliced, a circular cover body structure that is adapted to the light outlet can be formed, so that the appearance of the entire cover body is more complete and more flat and beautiful. The problem of insufficient consistency between the rotating cover body 2 and the lifting cover body 1 after assembly due to the large machining cumulative error caused by the large number of structure parts when the rotating cover body 2 is multiple, and the flash seams between the rotating cover body 2 and the lifting cover body 1 are solved.

[0069] In some embodiments, referring to Figures 2 to 5 As shown, the first driving assembly 4 includes a first motor 41 and a gear set 42 in transmission connection with the first motor 41. A rotating bearing 20 is arranged on the rotating cover body 2, and the gear set 42 is in connection with 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 shell in a first direction and rotate to the inside of the lifting cover body 1 to expose the light outlet, and rotate the rotating cover body 2 relative to the shell in the opposite direction of the first direction and rotate out of the inside of the lifting cover body 1 to cover the light outlet.

[0070] For example, the gear set 42 can include two or more gears in meshing with each other. When the gear set 42 includes two gears in meshing with each other, one of the gears is in driving connection with the output shaft of the first motor 41, and the other gear is connected with the rotating cover body 2. The two gears are driven by the first motor 41 to realize the rotation of the rotating cover body 2. Referring to Figure 2As shown, in some embodiments, the gear set 42 comprises a first gear 421, a second gear 422 and a third gear 423 successively engaged, the first gear 421 is connected with the output shaft of the first motor 41, the second gear 422 is engaged with the first gear 421 and the third gear 423 respectively, and the third gear 423 is connected with the rotating bearing 20 in a matching mode. The diameter of the first gear 421 is small, so that the driving force of the first motor 41 for driving the first gear 421 to rotate is small, which can reduce the energy consumption of the first motor 41 to a certain extent, and the sizes of the second gear 422 and the third gear 423 increase, 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 small size, and can drive the second gear 422 and the third gear 423 to rotate in engagement, so as to realize the rotation of the rotating cover 2, so that the operation stability and reliability of the rotating cover 2 are high, and the operation noise is low. The laser projection equipment is automatically opened when starting, and is automatically closed when shutting down.

[0071] It should be noted that the above definition of 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 process, the first driving assembly 4 can also realize the rotation of the rotating cover 2 through other transmission mechanisms. For example, the first driving assembly 4 can also comprise a motor and a connecting rod mechanism in transmission connection with the motor, the connecting rod mechanism can comprise a plurality of mutually articulated connecting rods, and the connecting rod mechanism can be in transmission connection with the rotating cover 2, so that the rotation of the rotating cover 2 can also be realized by driving the connecting rod mechanism by the motor.

[0072] In some embodiments, referring to Figure 4 As shown, specifically, the rotating sensing piece 51 is in a sheet or plate structure, and the rotating sensing piece 51 as a whole is in a fan shape. For example, the rotating sensing piece 51 can be in a 1 / 4 fan structure, the center of the fan structure is connected with the rotation center of the gear set 42, so that the fan structure can rotate around the rotation center of the gear set 42; the arc-shaped outer contour surface of the fan structure is in contact with the detection piece 5 during the rotation of the rotating sensing piece 51 to trigger the detection piece 5.

[0073] Specifically, the rotation sensing member 51 has a first end and a second end at two ends of the sector 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 two sides of the second gear 422. The rotation sensing member 51 rotates along with the rotating cover 2 along the rotation path, and the first rotation sensor 52 and the second rotation sensor 53 are respectively arranged on two sides of the rotation sensing member 51 and correspond to the rotation path, so that one end of the rotation sensing member 51 triggers one of the sensors and rotates along the sensor during rotation, and when the end is away from the sensor, the other end can immediately trigger the other sensor and rotate along the other sensor to ensure that the rotation sensing member rotates to the target position in one rotation period. That is, when the end located at the front end of the rotation direction of the rotation sensing member 51 triggers one of the first rotation sensor 52 and the second rotation sensor 53 during rotation, the end located at the rear end of the rotation direction is away from the other one of the first rotation sensor 52 and the second rotation sensor 53.

[0074] 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, and the rotating cover 2 can rotate to the inside of the lifting cover 1 in the clockwise or counterclockwise direction. Since the rotation sensing member 51 has a quarter circular structure, the included angle between the two ends of the rotation sensing member 51 is 90°, and the first rotation sensor 52 and the second rotation sensor 53 are respectively arranged on the two ends of the rotation sensing member 51. Figure 5As shown, when the rotation sensing piece 51 rotates, one end of the rotation sensing piece can trigger the first rotation sensor 52 and continue to rotate along the first rotation sensor 52, at this time, the signal change of the first rotation sensor 52 is: ON→maintain 90°, until the end part leaves the first rotation sensor 52, at this time, the other end of the rotation sensing piece 51 directly enters the second rotation sensor 53 and triggers the second rotation sensor 53, at this time, the signal change of the first rotation sensor 52 is OFF, the signal change of the second rotation sensor 53 is ON, and the rotation sensing piece 51 continues to rotate along the second rotation sensor 53, until the other end of the rotation sensing piece 51 leaves the second rotation sensor 53, at this time, the signal change of the second rotation sensor 53 is: maintain 90°→OFF. Through the above trigger rotation process of the rotation sensing piece 51 and the first rotation sensor 52 and the second rotation sensor 53, it can be ensured that the first motor 41 drives the rotating cover body 2 to rotate 180° in essence, so that the rotating cover body 2 can rotate to the inside of the lifting cover body 1 in the first direction, and substantially coincide with the lifting cover body 1, to expose the light port and realize the normal projection function of the laser projection equipment. By arranging the first rotation sensor 52 and the second rotation sensor 53 on both sides of the rotation sensing piece 51, the rotation sensing piece 51 can be more accurately calculated to rotate 180°, and only one sensor is arranged to detect, the detection error is larger, and in some cases, the signal of the sensor can directly change from ON to OFF when the rotation sensing piece 51 has not rotated to the position. Compared with detecting whether to rotate to the position by only one sensor, the accuracy of detecting by two sensors in the embodiment is higher.

[0075] It should be noted that due to the inevitable errors in the machining and assembly stages of the lifting cover 1 and the rotating cover 2, there will be a flash gap between the two after the assembly is completed in the factory stage. Therefore, in the factory debugging stage, only when the first rotation sensor 52 and the second rotation sensor 53 both detect that the rotation sensing piece 51 rotates 90°, it is determined that the rotating cover 2 is indeed rotated in place, and then the debugging personnel manually observe and detect whether there is a flash gap between the lifting cover 1 and the rotating cover 2. At this time, if the debugging personnel detects that the gap between the lifting cover 1 and the rotating cover 2 is flush, it proves that there is no flash gap between the lifting cover 1 and the rotating cover 2, and this is the ideal assembly process between the lifting cover 1 and the rotating cover 2. If the debugging personnel detects that there is a clear 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 flash gap between the lifting cover 1 and the rotating cover 2, which will cause a large amount of dust to enter the shell 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 adhering to the lens is easy to scratch the lens. At this time, the debugging personnel needs to continue to drive the rotating cover 2 to rotate according to the position of the flash gap, so as to solve the flash 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 2 to rotate, and the rotation sensing piece 51 rotates to trigger the first rotation sensor 52 and the second rotation sensor 53 in turn, until the rotation sensing piece 51 rotates 180°. At this time, it is confirmed that the rotating cover 2 has been driven to rotate to 180°, and the debugging personnel observes and detects the lifting cover 1 and the rotating cover 2, and finds that the rotating cover 2 has not been completely matched with the lifting cover 1. If the flash gap between the left side of the rotating cover 2 and the lifting cover 1 is large, the debugging personnel can control the first motor 41 to drive the rotating cover 2 to rotate a certain angle, such as 1° or 2°, 3°, to the left side through the debugging remote controller, until the rotating cover 2 is rotated in place relative to the lifting cover 1. If the flash gap between the right side of the rotating cover 2 and the lifting cover 1 is large, the debugging personnel can control the first motor 41 to drive the rotating cover 2 to rotate a certain angle, such as 1° or 2°, 3°, to the right side through the debugging remote controller, until the rotating cover 2 is rotated in place relative to the lifting cover 1. At this time, the flash gap between the lifting cover 1 and the rotating cover 2 is small, and the data of the rotation angle of the rotating cover 2 is directly saved through the debugging remote controller. The next time the rotating cover 2 is rotated, the rotating cover 2 is directly rotated to the position by running the saved rotation angle.

[0077] In a specific application, there are two adjustment modes for the flash gap between the lifting cover 1 and the rotating cover 2. The first adjustment mode is to open the first rotation sensor 52 and the second rotation sensor 53, first drive the rotating cover 2 to rotate through the first motor 41 and the gear set 42, make the rotating induction piece 51 trigger the first rotation sensor 52 and the second rotation sensor 53 in turn, until the rotating induction piece 51 rotates 180°, then according to the last rotation debugging program saved by the laser projection device, drive the rotating induction piece 51 to continue rotating a certain number of degrees or reversing a certain number of degrees, until the rotating cover 2 is determined to be in the final state, to ensure that the rotating cover 2 is rotated in place and the flash gap is small; the second debugging mode is to directly drive the rotating cover 2 to rotate according to the final rotation angle through the first motor 41 according to the last rotation debugging program saved by the laser projection device, for example, directly drive the rotating cover 2 to rotate 178° or 182° as needed, to rotate the rotating cover 2 in place at one time, and in this debugging mode, only the rotation sensor at the starting position is opened, that is, the rotating induction piece 51 only needs to trigger the rotation sensor at the starting position, to ensure that the rotating induction piece 51 also rotates with the gear set 42.

[0078] Both of the above two adjustment modes can ensure that the rotating cover 2 is rotated in place relative to the lifting cover 1, minimize the flash gap between the lifting cover 1 and the rotating cover 2, ensure that the lifting cover 1 and the rotating cover 2 are more compatible, and make the step difference between the lifting cover 1 and the rotating cover 2 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 1 and the rotating cover 2. It should be noted that in the second adjustment mode, only one rotation sensor is opened, but it cannot accurately verify the rotation angle of the rotating induction piece 51 to some extent, resulting in poor accuracy of this adjustment mode. The second adjustment mode is to first ensure that the rotating induction piece 51 rotates 180° based on the detection of the two rotation sensors, and then continue to detect the second rotation of the rotating induction piece 51, so that the rotating induction piece 51 can always be in the triggering detection of the rotation sensor, ensuring the rotation accuracy of the rotating induction piece 51, so that the accuracy of the first adjustment mode is better than that of the second adjustment mode.

[0079] It should be noted that in actual application, the detection piece 5 can also be other detection components. For example, the detection piece 5 can also only include one sensor and one rotating induction piece, the rotating induction piece is arranged on the rotating cover 2, and the sensor is arranged along the rotation path of the rotating induction piece, so that the rotating induction piece can always trigger the sensor during the rotation of the rotating cover 2, and the first motor 41 stops when the sensor detects that the rotating induction piece rotates a preset angle.

[0080] In some embodiments, with reference toFigure 6 As shown, the rotating cover 2 comprises a first mounting plate 22 and a first cover plate 21 attached to the first mounting plate 22, the first driving assembly 4 is connected with the first mounting plate 22, and the rotating bearing 20 is fixed on the first mounting plate 22. A plurality of supporting shims 23 are arranged between the first cover plate 21 and the first mounting plate 22. When assembled, the tool-chuck gauge is used to determine the flash gap and the step gap specification, so as to adjust the height of the first cover plate 21 relative to the lifting cover 1 and the parallelism of the first cover plate 21 relative to the first direction through the plurality of supporting shims 23, that is, the relative height and parallelism of the first cover plate 21 are adjusted through the plurality of supporting shims 23, so as to reduce the step gap problem caused by the cumulative error of the structural member.

[0081] In some embodiments, with reference to Figure 7 As shown, the laser projection device further comprises a mounting base 6 located in the shell, and the mounting base 6 comprises a mounting plate and a mounting bracket on the mounting plate. The mounting plate is used for mounting the first driving assembly 4, and the mounting bracket is used for mounting the first driving assembly 4. By connecting the second driving assembly 3 and the first driving assembly 4 with the lifting cover 1 and the rotating cover 2 respectively, the movement of the two covers can be driven respectively, the stability of the structure is good, and the installation and maintenance are convenient.

[0082] Exemplarily, the laser projection device further comprises a first photoelectric switch 71 and a second photoelectric switch 72, both of which are arranged in the shell. 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 with the second driving assembly 3. The laser projection device further comprises a first trigger plate 81 and a second trigger plate 82, both of which are arranged on the lifting cover 1. The first trigger plate 81 is configured to: when the laser projection device is turned on and starts to work, the second driving assembly 3 drives the lifting cover 1 to rise to a target position in a direction away from the light outlet, the first trigger plate 81 triggers the first photoelectric switch 71 at this time, and the second driving assembly 3 stops driving. The second driving assembly 3 starts to drive the rotating cover 2 to rotate through the gear set 42, until the rotating cover 2 rotates to the inside of the lifting cover 1 along the first direction. The second trigger plate 82 is configured to: when the laser projection device is turned off, the second driving assembly 3 drives the rotating cover 2 to rotate out of the lifting cover 1 and reset, and the second driving assembly 3 drives the lifting cover 1 to descend to an initial position in a direction close to the light outlet. The second trigger plate 82 triggers the second photoelectric switch 72 at this time, and the second driving assembly 3 stops driving, thereby completing the covering and protecting action of the lifting cover 1 and the rotating cover 2 on the light outlet.

[0083] It should be noted that in the factory debugging stage, the lifting cover body 1 is driven to rise and fall by the second driving assembly 3, and the debugging personnel find that the lifting cover body 1 does not completely match with the rotating cover body 2 after falling, at this time, the step difference between the lifting cover body 1 and the rotating cover body 2 is large, which can cause a large amount of dust to enter the shell through the height gap between the two cover bodies and adhere to the lens surface, affecting the projection effect and image clarity of the lens, and the dust adhered to the lens is easy to scratch the lens. The debugging personnel can use the debugging remote control for controlling the second motor 31 to rotate forward or reverse, to control the second motor 31 to rotate forward or reverse by a certain angle according to the step difference, until the lifting cover body 1 is rotated to the position, and the step difference between the lifting cover body 1 and the rotating cover body 2 is reduced as much as possible. After the debugging personnel rotate the lifting cover body 1 to the final state by 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, so as to ensure that the lifting cover body 1 and the rotating cover body 2 are more matched, so that the problem of large step difference between the lifting cover body 1 and the rotating cover body 2 does not exist, so that the step difference between the lifting cover body 1 and the rotating cover body 2 after the lifting cover body 1 falls can be kept within 0.4mm.

[0084] For example, the lifting cover body 1 can be flat and parallel to the top cover of the shell; or the lifting cover body 1 can also be composed of a top plate and a side plate connected to each other to completely enclose the first containing cavity and ensure the dustproof effect. For another example, the lifting cover body 1 can be a thin-walled part, which can not only reduce the occupied space and facilitate the avoidance of other parts of the laser projection device, but also can be visually regarded as part of the shell, so that the overall appearance of the laser projection device 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 on the top of the lifting cover body 1 by adhesive, which reduces the cost and improves the overall appearance of the cover.

[0085] On this basis, the transmission mechanism of the second driving assembly 3 is in transmission connection 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 along the direction perpendicular to the shell. The above transmission connection refers to a connection mode that can transmit the power of the second motor 31 to the transmission mechanism and then to the lifting cover body 1 to make the lifting cover body 1 move linearly. For example, the transmission mechanism can be a gear and 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 screw 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 applied. In this way, the second motor 31 can drive the lifting cover body to approach or move away from the light outlet along the direction perpendicular to the top cover of the shell through the transmission mechanism.

[0086] In some embodiments, referring to Figures 7 to 10 The transmission mechanism of the second driving assembly 3 includes a cam 32 installed 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 installed on the output shaft of the second motor 31 through a key connection; or, the cam 32 can also be installed on a transmission shaft connected to the output shaft of the second motor 31 through a shaft coupling, both of which can be applied. Exemplarily, the cam 32 can directly abut against the lifting cover body 1; or, the transmission mechanism of the second driving assembly 3 can further include a reinforcing block 33 connected to the lifting cover body 1 through a threaded connecting piece, and 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 reinforcing block 33, so as to prevent the cam 32 from directly contacting the lifting cover body 1 and accelerate the wear of the lifting cover body 1.

[0087] Therefore, in order to move the lifting cover body 1 along a set direction and move stably, the second driving assembly 3 further includes a guide member arranged in the shell and extending along 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 sliding groove can be formed on the lifting cover body 1, and the lifting cover body 1 is slidably connected to the guide member through the sliding groove; or, the guide member can also be a guide column, and a corresponding guide hole can be formed on the lifting cover body 1, and the lifting cover body 1 is slidably connected to the guide member through the cooperation of the guide hole and the guide column, both of which can be applied. In this way, the lifting cover body 1 can be moved close to or away from the light outlet along a direction perpendicular to the top cover of the shell, and the lifting cover body 1 can be moved stably.

[0088] Exemplarily, as shown in Figure 10As shown, the guide member includes a guide shaft 34 arranged in the housing, and the guide shaft 34 penetrates the second mounting plate 12. Exemplarily, one end of the guide shaft 34 away from the light outlet can be directly connected with the housing; or, one end of the guide shaft 34 away from the light outlet can also be indirectly connected with the housing through the mounting base 6 or the like structure. On this basis, the second driving assembly 3 further includes a linear bearing 35 fixedly connected with 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 can include a connecting plate 351 and a sliding sleeve 352 connected with each other, the connecting plate 351 can be arranged around the outer side wall of the sliding sleeve 352, the connecting plate 351 can be connected with the second mounting plate 12 through a threaded connecting piece, and the sliding sleeve 352 is sleeved on the guide shaft 34, i.e., the sliding sleeve 352 is located between the guide shaft 34 and the penetrating hole of the second mounting plate 12, so that the direct contact and friction between the second mounting plate 12 and the guide shaft 34 can be prevented to slow down the abrasion of the second mounting plate 12, and meanwhile, the resistance of the moving of the lifting cover body 1 can be reduced to facilitate the driving of the moving of the lifting cover body 1. Exemplarily, the number of the guide shaft 34 and the linear bearing can both be two, and the two are symmetrically arranged on both sides of the axis of the cam 32, so that the moving of the lifting cover body 1 can be more stable. In order to ensure the reliability of the moving of the lifting cover body 1, in some embodiments, the second driving assembly 3 further includes a limiting piece 341 and a spring 36. The limiting piece 341 is arranged on the guide shaft 34 and located on both sides of the cam 32 of the second mounting plate 12. Exemplarily, the limiting piece 341 can be an open sleeve ring sleeved on the guide shaft 34, and the two end portions of the open sleeve ring are connected through a threaded connecting piece to fix the open sleeve ring on the guide shaft 34, so that the position of the limiting piece 341 on the guide shaft 34 can be adjusted as needed, and the adjustment and disassembly are convenient and have strong applicability. It should be noted that in other embodiments, the limiting piece 341 can also be a shaft sleeve in interference fit with the guide shaft 34, which can also be applied. On this basis, the spring 36 is sleeved on the guide shaft 34, and the two ends of the spring 36 respectively abut against the second mounting plate 12 and the limiting piece 341. In this way, when the lifting cover body 1 needs to move in the direction perpendicular to the top wall of the housing to approach the light outlet (or the bottom wall of the housing), under the elastic force of the spring 36, the lifting cover body 1 will move in the direction approaching the light outlet, so that the reliability of the moving of the lifting cover body 1 is ensured, and then the surface of the lifting cover body 1 towards the outside of the housing is ensured to be coplanar with the surface of the rotating cover body 2 towards the outside of the housing, so that the appearance of the laser projection device is good in appearance. Exemplarily, in the case where the number of the guide shaft 34 is two, the number of the limiting piece 341 and the spring 36 is two, and the limiting piece 341 and the spring 36 correspond one by one, so that the moving of the lifting cover body 1 is more stable.

[0089] In some embodiments, with reference to Figure 7As shown, the lifting cover body 1 further comprises 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 surround to form a containing 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 to the containing cavity along the first direction, so that when the rotating cover body 2 rotates to the position of exposing the light port, the rotating cover body 2 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 structure space formed by the lifting cover body 1 can be fully utilized, so that the rotating cover body 2 has a certain gap between the outer side wall and the inner side wall of the lifting cover body 1, the space occupied by the rotating cover body 2 when rotating is smaller, and the overall appearance of the cover body is ensured.

[0090] It should be noted that, in this document, relational terms such as“first” and“second”, and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms“comprises”,“comprising”, or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by“comprises a...” does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0091] The above merely provides specific embodiments of the present disclosure, enabling those skilled in the art to 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, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A laser projection device, characterized by, The application relates to a laser projection device. The device comprises a shell, a projection host arranged in the shell, and a light outlet arranged on the shell for the light beam emitted by the projection host to pass through. A rotating cover is arranged at the light outlet. A first driving assembly is connected with the rotating cover and used to drive the rotating cover to rotate relative to the shell to expose or cover the light outlet. A rotating induction piece is connected with the first driving assembly. A detection piece is arranged corresponding to the rotating induction piece. A controller is electrically connected with the detection piece and the first driving assembly. The rotating induction piece is configured to rotate with the rotating cover under the driving of the first driving assembly, and the rotating induction piece contacts the detection piece in the rotating process to trigger the detection piece, so that the rotating angle of the rotating cover is detected by the detection piece, and the controller controls the start and stop of the first driving assembly according to the detection result of the detection piece. The laser projection device further comprises a lifting cover and a second driving assembly. The lifting cover is arranged at the light outlet. The second driving assembly is connected with the lifting cover and used to drive the lifting cover to move relative to the shell along the direction in which the light beam passes through the light outlet or the opposite direction to the light outlet to move away from or close to the light outlet. The first driving assembly is used to drive the rotating cover to rotate to the inside of the lifting cover to expose the light outlet or drive the rotating cover to rotate out of the inside of the lifting cover to cover the light outlet when the lifting cover moves to a preset position relative to the shell along the direction in which the light beam passes through the light outlet. The rotating cover and the lifting cover are both semicircular structures, and the rotating cover and the lifting cover jointly form a circular cover structure. The rotating cover comprises a first mounting plate and a first cover plate attached to the first mounting plate, the first driving assembly is connected with the first mounting plate, and a plurality of supporting shims 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 and the parallelism of the first cover plate relative to the rotating direction.

2. The laser projection device of claim 1, wherein, The detection piece comprises a rotating sensor. In the rotating process of the rotating induction piece, one end of the rotating induction piece in the rotating direction can contact the rotating sensor to trigger the rotating sensor, and the rotating induction piece continuously contacts the rotating sensor until the other end of the rotating induction piece in the rotating direction leaves the rotating sensor.

3. The laser projection device of claim 2, wherein, The number of the rotating sensors is two, namely a first rotating sensor and a second rotating sensor, and the first rotating sensor and the second rotating sensor are arranged at intervals. In the rotating process of the rotating induction piece, when one end of the rotating induction piece in the front end of the rotating direction contacts one of the first rotating sensor and the second rotating sensor, the other end of the rotating induction piece in the rear end of the rotating direction leaves the other of the first rotating sensor and the second rotating sensor.

4. The laser projection device according to any one of claims 1 to 3, characterized in that, The first driving assembly is configured to drive the rotary cover to rotate relative to the shell in a first direction and into the interior of the lifting cover, and to drive the rotary cover to rotate relative to the shell in the opposite direction of the first direction and out of the interior of the lifting cover.

5. The laser projection device of claim 4, wherein, The first driving assembly comprises a first motor and a gear set in transmission connection with the first motor. The rotary cover is provided with a rotary bearing, the gear set is in matching connection with the rotary bearing, and the first motor drives the rotary cover to rotate through the gear set.

6. The laser projection device of claim 5, wherein, The gear set comprises a first gear, a second gear and a third gear in sequence, the first gear is connected with an output shaft of the first motor, the second gear is in meshing connection with the first gear and the third gear respectively, and the third gear is in matching connection with the rotary bearing. The rotary sensing member is in a fan-shaped structure, a center of the fan-shaped structure is connected with a rotation center of the second gear and rotates along with the second gear, and an arc-shaped outer contour surface of the fan-shaped structure is in contact with the detection member to trigger the detection member in the rotation process of the rotary sensing member.

7. The laser projection device according to any one of claims 1 to 3, characterized in that, The laser projection device further comprises: A first photoelectric switch and a second photoelectric switch are arranged in the shell, and the first photoelectric switch is in electrical connection with the second driving assembly. A first trigger plate and a second trigger plate are arranged on the lifting cover, the first trigger plate is configured to trigger the first photoelectric switch when the second driving assembly drives the lifting cover to ascend to a target position away from the light outlet, and the second trigger plate is configured to trigger the second photoelectric switch when the second driving assembly drives the lifting cover to descend to an initial position close to the light outlet.

8. The laser projection device according to any one of claims 1 to 3, characterized in that, The lifting cover comprises a second cover plate and a second mounting plate connected with each other. The second driving assembly comprises a second motor, a cam and a guide shaft, the cam is connected with an output shaft of the second motor, a rim of the cam is in abutting connection with the second mounting plate, the guide shaft is arranged through the second mounting plate in a height direction of the lifting cover, the lifting cover and the guide shaft are in sliding connection, an end of the guide shaft close to the second cover plate is sleeved with a limiting member, the guide shaft is sleeved with an elastic member between the limiting member and the second mounting plate, and two ends of the elastic member are in abutting connection with the second mounting plate and the limiting member respectively.

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