Projection screen, projection device, and vehicle

Abstract

The application provides a projection screen, a projection device and a vehicle. The screen cloth assembly of the projection screen comprises a connecting end and a winding end. The arm rod comprises a first connecting arm and a second connecting arm which are hingedly connected. The first connecting arm is rotationally connected with the connecting end, and the second connecting arm is rotationally connected with the winding end. The driving mechanism is drivingly connected with the connecting end and is used to drive the winding end to be wound and unwound relative to the connecting end, so that the first connecting arm and the second connecting arm are folded and unfolded. The locking assembly comprises a ratchet wheel, a pawl and an elastic member. The ratchet wheel is rotationally connected with the first connecting arm. The ratchet wheel comprises at least one ratchet tooth. One end of the elastic member is fixed, and the other end is connected with the pawl. The pawl is used to engage with the ratchet wheel. Based on this, the projection screen of the application has a simple structure, can realize hovering, and is stable and reliable in operation.

Description

Technical Field

[0001] This application relates to the field of projection equipment, specifically to a projection screen, projection equipment, and vehicle. Background Technology

[0002] Projection screens are used to display images, videos, and other information projected by projection devices. They are widely used in home theaters, office meetings, schools, billboards, vehicle displays, and many other scenarios.

[0003] Current projection screens typically use lifting mechanisms to raise and lower the screen, thereby enabling it to roll up and unfold. However, these technologies cannot stably keep the screen suspended. Utility Model Content

[0004] The purpose of this application is to provide a projection screen, projection equipment, and vehicle with a simple structure that can stably achieve hovering.

[0005] To address the aforementioned problems, in a first aspect, this application provides a projection screen, comprising: The curtain assembly includes a connector and a winding end; The boom includes a hinged first connecting arm and a second connecting arm, wherein the first connecting arm is rotatably connected to the connecting end and the second connecting arm is rotatably connected to the winding end; A drive mechanism, which is connected to the connecting end and is used to drive the winding end to wind and unwind relative to the connecting end, so as to fold and open the first connecting arm and the second connecting arm; and The locking assembly includes a ratchet, a pawl, and an elastic element. The ratchet is rotatably connected to the first connecting arm and includes at least one ratchet tooth. One end of the elastic element is fixed and the other end is connected to the pawl, which is used to engage with the ratchet.

[0006] Optionally, the projection screen includes at least two of the arms and at least two locking components equal in number to the number of the arms, wherein the at least two locking components are configured in a one-to-one correspondence with the at least two arms; Each of the aforementioned arms is spaced apart and is used to move under the drive of the drive mechanism and drive the ratchet of the corresponding locking assembly to rotate.

[0007] Optionally, the projection screen further includes at least two angle detection components, the number of which is equal to the number of the arms. The at least two angle detection components are configured in one-to-one correspondence with the at least two arms, and each angle detection component is used to detect the opening angle of the arm.

[0008] Optionally, the angle detection component includes a magnet and an angle sensor, the angle sensor being disposed on the ratchet of the corresponding locking component, and the magnet being disposed on the rotating shaft of the ratchet.

[0009] Optionally, the projection screen may further include a push rod motor for disengaging the pawl from the ratchet.

[0010] Optionally, the ratchet includes at least a first ratchet tooth and a second ratchet tooth, wherein the first ratchet tooth indicates that the screen assembly has one-quarter of the maximum projected area when it engages with the pawl; and the second ratchet tooth indicates that the screen assembly has one-half of the maximum projected area when it engages with the pawl.

[0011] Optionally, the curtain assembly includes a curtain body, a roller tube, and a movable cover plate. One end of the curtain body is connected to the roller tube to form the connecting end, and the other end of the curtain body is connected to the movable cover plate to form the winding end.

[0012] Optionally, the projection screen further includes a housing, and the connecting end, the driving mechanism, and the locking component are all connected to the housing.

[0013] Secondly, this application also provides a projection device, including a projection apparatus and a projection screen as described above, wherein the projection apparatus is used to project images onto the projection screen.

[0014] Thirdly, this application also provides a vehicle, including a vehicle body and a projection screen as described above, wherein the projection screen is connected to the vehicle body.

[0015] Based on the above technical solution, the first connecting arm of the projection screen in this application is rotatably connected to the connecting end of the screen assembly, and the second connecting arm is connected to the winding end of the screen assembly. When the drive mechanism drives the winding end of the screen assembly to move relative to the connecting end, causing the screen assembly to roll up and unfold, the arm rotatably connected to the screen assembly can also fold and open synchronously with the screen assembly. Therefore, this application does not need to set up an additional motor structure to drive the arm movement, simplifying the structure of the projection screen. At the same time, the arm can provide support for the screen assembly, and the arm can better support the movement of the screen assembly, making the movement of the screen assembly smoother and more stable. Furthermore, the locking assembly of this application, through the cooperation of a ratchet, a pawl, and an elastic element, is a unidirectional operating structure. When the ratchet rotates under the drive of the lever until its teeth engage with the pawl, the screen assembly can be suspended. If the ratchet has multiple teeth, the locking assembly of this application can achieve multi-stage suspension of the screen assembly. Moreover, the locking assembly of this application is a purely mechanical structure, not easily affected by temperature, humidity, or electromagnetic interference, making it safer and more reliable. Based on this, this application provides a projection screen with a simple structure, smooth, stable, and reliable screen assembly operation, and the ability to achieve suspension. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of this application. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0017] Figure 1 This is a schematic diagram of a first structure of a projection screen provided in an embodiment of this application; Figure 2 for Figure 1 A schematic diagram of the projection screen in another state; Figure 3 for Figure 1 The diagram shows the structure of the projection screen in another state. Figure 4 A schematic diagram of the structure of the arm of the projection screen provided in an embodiment of this application; Figure 5 for Figure 4 A schematic diagram showing another state of the boom; Figure 6 for Figure 4 A schematic diagram showing another state of the boom; Figure 7 A schematic diagram of a locking component for a projection screen provided in an embodiment of this application; Figure 8 for Figure 7The diagram shows a structural schematic of the locking assembly in another state. Figure 9 for Figure 7 The diagram shows the structure of the locking assembly in another state. Figure 10 for Figure 7 The diagram shows the structure of the locking component in another state. Figure 11 A schematic diagram of the operation of a push rod motor for a projection screen provided in an embodiment of this application; Figure 12 A connection diagram of the angle detection component for the projection screen provided in an embodiment of this application; Figure 13 A schematic diagram of the structure of a projection device provided in an embodiment of this application; Figure 14 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application.

[0018] The reference numerals in the attached figures are as follows: 10. Projection screen; 20. Projection device; 30. Vehicle body; 40. Projection equipment; 50. Vehicle; 100. Screen assembly; 200. Arm; 200a. First arm; 200b. Second arm; 400. Locking assembly; 400a. First locking assembly; 400b. Second locking assembly; 500. Push rod motor; 500a. First push rod motor; 500b. Second push rod motor; 600. Housing; 700. Angle detection assembly; 110. Connecting end; 120. Winding end; 130. Screen body; 140 150. Reel; 210. Movable cover plate; 220. First connecting arm; 230. Second connecting arm; 240. Hinge; 250. First pivot; 260. Second pivot; 410. Ratchet; 420. Pawl; 430. Elastic element; 440. Base; 411. Initial region; 412. Termination region; 413. Ratchet tooth; 413a. First ratchet tooth; 413b. Second ratchet tooth; 416. Third pivot; 421. Fourth pivot; 710. Magnet; 720. Angle sensor; H1. First direction; H2. Second direction. Detailed Implementation

[0019] The following will refer to the appendices in this application. Figure 1 To be continued Figure 14 The technical solutions in this application are clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] With the further development of automotive intelligence, manufacturers are increasingly emphasizing the functionality and user experience of in-vehicle screens. Screens with flexible adjustment and stability can further enhance the competitiveness of in-vehicle projection. The user experience of the screen requires stability during multi-stage hovering and a level image. Most in-vehicle screens with existing technologies can only achieve basic unfolding and retraction, and are prone to tilting. Now, many car manufacturers not only require screens to support multi-stage hovering to meet users' flexible selection of different projection areas, but also require technical means to ensure that the screen does not tilt after hovering and maintains a straight image. However, existing screens cannot simultaneously meet the requirements of multi-stage hovering and anti-tilting.

[0022] To address the aforementioned technical problems, this application provides a projection screen 10, a projection device 40, and a vehicle 50, which can solve one or more of the above-mentioned technical problems. The following description, in conjunction with specific embodiments, will illustrate these problems.

[0023] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of a first structure of the projection screen 10 provided in an embodiment of this application. Figure 2 for Figure 1 The diagram shows a structural schematic of the projection screen 10 in another state. The projection screen 10 includes a screen assembly 100, an arm 200, a drive mechanism (not shown in the figures), and a locking assembly 400. The screen assembly 100 includes a connecting end 110 and a winding end 120. The arm 200 includes a hinged first connecting arm 210 and a second connecting arm 220, the first connecting arm 210 being rotatably connected to the connecting end 110, and the second connecting arm 220 being rotatably connected to the winding end 120. The drive mechanism is drively connected to the connecting end 110 and is used to drive the winding end 120 to rewind and unfold relative to the connecting end 110, so that the first connecting arm 210 and the second connecting arm 220 fold and unfold accordingly. The locking assembly 400 includes a ratchet 410, a pawl 420, and an elastic element 430. The ratchet 410 is rotatably connected to the first connecting arm 210. The ratchet 410 includes at least one ratchet tooth 413. One end of the elastic element 430 is fixed and the other end is connected to the pawl 420. The pawl 420 is used to engage with the ratchet 410.

[0024] The screen assembly 100 includes at least a screen body 130, which is used to receive images projected by the projection device 20. The screen body 130 includes a first edge and a second edge disposed opposite to each other along a first direction H1. The first edge may be the top edge of the screen body 130, and the second edge may be the bottom edge of the screen body 130. The second edge may be rolled up or unfolded relative to the first edge along the first direction H1.

[0025] Understandably, in some examples, the curtain assembly 100 may also include a roller tube 140, with a first edge of the curtain body 130 fixedly connected to the roller tube 140, and a second edge that can be rolled up onto or unfolded relative to the roller tube 140. A drive mechanism may be drively connected to the roller tube 140, and the drive mechanism may drive the roller tube 140 to rotate and cause the curtain body 130 to be rolled up onto or unfolded relative to the roller tube 140.

[0026] Understandably, in some examples, the curtain assembly 100 may also include a movable cover 150. The movable cover 150 extends along a second direction H2 and connects to the second edge of the curtain body 130. This second direction H2 is perpendicular to the first direction H1. When the first direction H1 is the unfolding direction or height direction of the curtain body 130, the second direction H2 may be the length direction of the curtain body 130. The movable cover 150 can protect the second edge of the curtain body 130 and increase the weight of the curtain body 130, allowing the curtain body 130 to unfold more smoothly under the influence of gravity.

[0027] It is understood that when the curtain assembly 100 includes a curtain body 130, the connecting end 110 of the curtain assembly 100 can be the first edge of the curtain body 130, and the winding end 120 of the curtain assembly 100 can be the second edge of the curtain body 130. When the curtain assembly 100 also includes other structures, the first edge of the curtain body 130 and the structure it is connected to can jointly form the connecting end 110, and the second edge of the curtain body 130 and the structure it is connected to can jointly form the winding end 120. For example, when the curtain assembly 100 simultaneously includes a curtain body 130, a roller tube 140, and a movable cover plate 150, one end of the curtain body 130, for example, the first edge, is connected to the roller tube 140, and the two can jointly form the connecting end 110 of the curtain assembly 100, and the other end of the curtain body 130, for example, the second edge, is connected to the movable cover plate 150, and the two can jointly form the winding end 120.

[0028] The driving mechanism may include, but is not limited to, a driving component and a transmission component. The driving component may be, but is not limited to, a motor driving component, a piston driving component, or a cylinder driving component; the transmission component may be, but is not limited to, a gear transmission component or a belt transmission component. The output shaft of the driving component is connected to the transmission component, and the transmission component is drively connected to the connection end 110 of the curtain assembly 100. For example, the transmission component is connected to the connection end 110 via a winding tube 140. In some examples, the driving component drives the winding tube 140 to rotate in the opposite direction via the transmission component, and the winding end 120 of the curtain assembly 100 moves in the opposite direction (or upward) relative to the connection end 110 along the first direction H1 and is wound up, so that the curtain assembly 100 is wound on the winding tube 140. The driving component drives the winding tube 140 to rotate in the forward direction via the transmission component, releasing the wound curtain assembly 100, and the winding end 120 of the curtain assembly 100 moves in the forward direction (or downward) relative to the connection end 110 along the first direction H1 and is unwound.

[0029] It is understandable that when the drive mechanism drives the winding end 120 of the curtain assembly 100 to rewind and unfold relative to the connecting end 110, the curtain body 130, or the curtain assembly 100, can switch between a fully unfolded state, an intermediate state, and a fully rewound state. For example, please refer to... Figure 1 and Figure 2 Please refer to Figure 3 , Figure 3 for Figure 1 The diagram shows the structure of the projection screen 10 in another state. Figure 1 As shown, when the drive mechanism drives the winding end 120 of the screen assembly 100 to move downwards relative to the connecting end 110 to the maximum distance, the screen assembly 100 is in a fully unfolded state, and the screen body 130 has the maximum projection area. Figure 2 As shown, when the drive mechanism drives the winding end 120 of the screen assembly 100 to move upward relative to the connecting end 110 to the maximum distance, causing the screen assembly 100 to be fully retracted, the screen assembly 100 is in a fully retracted state, and the projected area of ​​the screen body 130 is approximately 0. Figure 3 As shown, when the drive mechanism drives the winding end 120 of the screen assembly 100 to unfold from the fully rolled-up state to the middle position less than the maximum position relative to the connecting end 110, or when the winding end 120 to retract from the fully rolled-up state to the middle position relative to the connecting end 110, the screen assembly 100 is in the middle state, and the projection area of ​​the screen body 130 is greater than 0 and less than the maximum projection area. At this time, the projection screen 10 is hovered.

[0030] Among them, such as Figure 4 As shown, Figure 4This is a schematic diagram of the structure of the arm 200 of the projection screen 10 provided in an embodiment of this application. The arm 200 is disposed on the back of the screen assembly 100, which is the non-projection surface of the screen assembly 100. The arm 200 is disposed on the back side of the projection surface of the screen assembly 100. The arm 200 is used to support the screen assembly 100. The first connecting arm 210 and the second connecting arm 220 of the arm 200 can be hinged to each other by, but not limited to, hinges 230 such as hinge springs, pivots, and hinges. The first connecting arm 210 can be rotatably connected to the connecting end 110 of the screen assembly 100 through a pivot, such as a first pivot 240, and the second connecting arm 220 can be rotatably connected to the winding end 120 of the screen assembly 100 through another pivot, such as a second pivot 250. When the drive mechanism drives the curtain assembly 100 to move, the winding end 120 of the curtain assembly 100 rolls up and unfolds relative to the connecting end 110. At the same time, the curtain assembly 100 can drive the first connecting arm 210 and the second connecting arm 220 to move, causing the two connecting arms to fold and open relative to each other. When the curtain assembly 100 switches between a fully unfolded state, an intermediate state, and a fully rolled-up state, the arm 200 can switch between a fully opened state, a transition state, and a fully folded state.

[0031] For example, such as Figure 1 and Figure 4 As shown, when the drive mechanism drives the winding end 120 of the curtain assembly 100 to unfold relative to the connecting end 110, the curtain assembly 100 drives the arm 200 to gradually unfold from the fully folded state. The second connecting arm 220 moves downward relative to the first connecting arm 210 along the first direction H1. The included angle between the first connecting arm 210 and the second connecting arm 220 gradually increases from 0 degrees. When the winding end 120 is unfolded to the maximum position relative to the connecting end 110, the included angle between the first connecting arm 210 and the second connecting arm 220 is approximately 180 degrees. The curtain assembly 100 is in the fully unfolded state, and the arm 200 is in the fully open state.

[0032] like Figure 2 and Figure 5 As shown, Figure 5 for Figure 4 The diagram shows another state of the arm 200. When the drive mechanism drives the winding end 120 of the curtain assembly 100 to retract relative to the connecting end 110, the curtain assembly 100 drives the arm 200 to gradually retract from the fully extended state. The second connecting arm 220 moves upward relative to the first connecting arm 210 along the first direction H1. The included angle between the first connecting arm 210 and the second connecting arm 220 gradually decreases from approximately 180 degrees. When the winding end 120 retracts to the maximum position relative to the connecting end 110, the included angle between the first connecting arm 210 and the second connecting arm 220 is approximately 0 degrees. The curtain assembly 100 is in a fully rolled-up state, and the arm 200 is in a completely folded state.

[0033] like Figure 3 and Figure 6 As shown, Figure 6 for Figure 4 The diagram shows another state of the arm 200. When the drive mechanism drives the winding end 120 of the curtain assembly 100 to unfold from the fully rolled-up state to the middle position (less than the maximum position) relative to the connecting end 110, or when the winding end 120 to retract from the fully rolled-up state to the middle position relative to the connecting end 110, the curtain assembly 100 drives the arm 200 to move, making the included angle between the two connecting arms greater than 0 degrees and less than 180 degrees. The curtain assembly 100 is in the middle state, and the arm 200 is in the corresponding transition state.

[0034] Among them, such as Figure 7 As shown, Figure 7 This is a schematic diagram of a locking assembly 400 for a projection screen 10 provided in an embodiment of this application. The locking assembly 400 is used to hover the screen assembly 100 at a preset position. The ratchet 410 of the locking assembly 400 is rotatably connected to the first connecting arm 210 via a pivot, such as a third pivot 416. In some examples, the first pivot 240, which rotatably connects the first connecting arm 210 and the connecting end 110, and the third pivot 416, which rotatably connects the ratchet 410 and the first connecting arm 210, are the same pivot. In other examples, the first pivot 240 and the third pivot 416 are parallel but not coaxial.

[0035] Understandably, the ratchet 410 is a wheel structure having an initial region 411, an ending region 412, and one or more (two or more) ratchet teeth 413. The ratchet teeth 413 are distributed between the initial region 411 and the ending region 412. The shape of the ratchet teeth 413 may be, but is not limited to, triangular, rectangular, or other suitable shapes. The ratchet teeth 413 are arranged along the edge of the ratchet 410 to form a gear-like structure. The ratchet 410 rotates with the rotation of its shaft, such as a third shaft 416.

[0036] Understandably, the pawl 420 is a component with a claw-like structure that matches the ratchet teeth 413. Supported by the elastic element 430, the pawl 420 can make close contact with the ratchet teeth 413. The elastic element 430 can be, but is not limited to, a tension spring structure. One end of the elastic element 430 is fixed, and the other end is connected to the pawl 420 and provides elastic force. When the elastic element 430 is in a stretched state, the pawl 420 is in a balanced state under the action of this elastic force.

[0037] Understandably, in some examples, the locking assembly 400 also includes a base 440, with one end of the elastic element 430 connected to and secured to the base 440. The ratchet 410, pawl 420, and elastic element 430 can all be integrated onto the base 440, resulting in a higher degree of integration for the locking assembly 400.

[0038] Understandably, please combine Figure 7 Please refer to Figure 8 and Figure 9 , Figure 8 for Figure 7 The diagram shown is a structural schematic of the locking assembly 400 in another state. Figure 9 for Figure 7 The schematic diagram of the locking assembly 400 in another state shows that when the ratchet 410 rotates in a certain direction, the pawl 420 will rotate from the initial region 411 of the ratchet 410 along the direction of the termination region 412 and slide over the ratchet teeth 413. Figure 7 The pawl 420 shown engages or is in close contact with the initial region 411 of the ratchet 410. Figure 8 The pawl 420 shown engages with one ratchet tooth 413 of the ratchet 410. Figure 9 The pawl 420 shown engages or is in close contact with the termination region 412 of the ratchet 410. Specifically, when the ratchet 410 attempts to rotate in the opposite direction, the pawl 420 engages with the ratchet teeth 413, forming a latch between the pawl 420 and the back of the ratchet teeth 413, preventing the ratchet 410 from moving in the opposite direction. The locking assembly 400 in this embodiment is a unidirectional operating structure.

[0039] Understandably, when the projection screen 10 receives a command to lower the screen by the first preset travel distance (e.g., 1 / 4 travel distance), the drive mechanism first rotates to release the screen assembly 100. At this time, the arm 200 slowly opens under the elastic force of the hinge 230 (e.g., the internal hinge spring), causing the ratchet 410 to rotate. The pawl 420, under the continuous action of the elastic element 430 (e.g., the torsion spring), remains tightly engaged with the ratchet 410. After the ratchet 410 rotates a certain angle, the pawl 420 passes through the first ratchet tooth 413, and the screen assembly 100 completes the lowering of the first preset travel distance (e.g., 1 / 4 travel distance). Since the combination of the ratchet 410 and the pawl 420 is a one-way self-locking mechanism, the pawl 420 will engage with the back of the ratchet tooth 413. At this time, the drive mechanism reverses, the screen assembly 100 is subjected to tension, and the arm 200 cannot continue to retract due to the engagement of the pawl 420. As the curtain assembly 100 continues to be pulled back, the load on the drive mechanism gradually increases, and its operating current rises synchronously. When the current reaches the preset threshold, the drive mechanism stops moving, and the curtain assembly 100 reaches the predetermined tension state.

[0040] Understandably, if the curtain assembly 100 needs to be adjusted to the next preset size, the drive mechanism first releases the curtain assembly 100, allowing the arm 200 to break free from the locking constraint of the pawl 420. Under the elastic force of the internal spring, the arm 200 continues to open, hovering at the second preset stroke (e.g., 1 / 2 stroke) or fully opening at the maximum stroke. The working principle of the drive mechanism, arm 200, and locking assembly 400 in the second preset stroke position and the fully opened state is exactly the same as in the first position, and will not be repeated here.

[0041] In this application, the first connecting arm 210 of the projection screen 10 is rotatably connected to the connecting end 110 of the screen assembly 100, and the second connecting arm 220 is connected to the winding end 120 of the screen assembly 100. When the drive mechanism drives the winding end 120 of the screen assembly 100 to move relative to the connecting end 110, causing the screen assembly 100 to roll up and unfold, the arm 200, which is rotatably connected to the screen assembly 100, can also fold and open synchronously with the screen assembly 100. Therefore, this application does not require an additional motor structure to drive the arm 200, simplifying the structure of the projection screen 10 and reducing its cost. At the same time, the arm 200 can provide support for the screen assembly 100, better supporting its movement, resulting in smoother and more stable movement of the screen assembly 100. Furthermore, the locking assembly 400 of this application, through the cooperation of a ratchet 410, a pawl 420, and an elastic element 430, is a unidirectional operating structure. When the ratchet 410 rotates under the drive of the arm 200 until its ratchet teeth 413 engage with the pawl 420, the screen assembly 100 can be suspended. If the ratchet 410 is provided with multiple ratchet teeth 413, the locking assembly 400 of this application can achieve multi-stage suspension of the screen assembly 100. Moreover, the locking assembly 400 of this application is a purely mechanical structure, not easily affected by temperature, humidity, or electromagnetic interference, making it safer and more reliable. Based on this, this application provides a projection screen 10 with a simple structure, smooth, stable, and reliable operation of the screen assembly 100, and the ability to achieve suspension.

[0042] Please refer to this again. Figures 7 to 9 Please refer to Figure 10 , Figure 10 for Figure 7The diagram shows a structural schematic of the locking assembly 400 in another state. In some examples, the ratchet 410 includes at least a first ratchet tooth 413a and a second ratchet tooth 413b, which are sequentially arranged between the initial region 411 and the final region 412 of the ratchet 410. The first ratchet tooth 413a indicates that the screen assembly 100 has one-quarter of the maximum projected area when engaged with the pawl 420, and the second ratchet tooth 413b indicates that the screen assembly 100 has one-half of the maximum projected area when engaged with the pawl 420.

[0043] It is understandable that, such as Figure 7 and Figure 8 As shown, if the projection screen 10 needs to unfold to one-quarter of its maximum area, the drive mechanism can first rotate to loosen the screen assembly 100. The arm 200 then slowly opens, driving the ratchet 410 to rotate. The ratchet 410 slowly rotates from an initial state where the area 411 is in close contact with the pawl 420 until the first ratchet tooth 413a engages with the pawl 420. At this point, the screen assembly 100 has one-quarter of its maximum projection area. Subsequently, the drive mechanism reverses, and the back of the pawl 420 and the ratchet tooth 413a form a locking mechanism, restricting the movement of the arm 200 and the screen assembly 100. The screen assembly 100 is then tensioned in the opposite direction and has one-quarter of its maximum projection area. The screen assembly 100 achieves a stop at one-quarter of the distance, resulting in a better display effect.

[0044] It is understandable that, such as Figure 7 , Figure 8 and Figure 10 As shown, if the projection screen 10 needs to be unfolded to half of its maximum area, the drive mechanism can first rotate to loosen the screen assembly 100. The arm 200 then slowly opens and drives the ratchet 410 to rotate. The ratchet 410 slowly rotates from an initial state where the ratchet tooth 411 is in close contact with the pawl 420 to a state where the first ratchet tooth 413a is engaged with the pawl 420. Subsequently, the drive mechanism continues to rotate to loosen the screen assembly 100, and the arm 200 drives the ratchet 410 to continue rotating from a state where the first ratchet tooth 413a is engaged with the pawl 420 to a state where the second ratchet tooth 413b is engaged with the pawl 420. At this point, the screen assembly 100 has half of its maximum projection area. Subsequently, the drive mechanism reverses, and the back of the pawl 420 and the ratchet tooth 413 form a locking mechanism to restrict the movement of the arm 200 and the screen assembly 100. The screen assembly 100 is tensioned in the opposite direction and has half of the maximum projection area. The screen assembly 100 achieves a hovering position at half the distance, and the screen assembly 100 has a better display effect.

[0045] Understandably, in some examples, the ratchet 410 may also be provided with more ratchet teeth 413 to correspond to different unfolding areas of the curtain assembly 100.

[0046] In this embodiment, the ratchet 410 is provided with a first ratchet tooth 413a and a second ratchet tooth 413b corresponding to one-quarter and one-half of the maximum projection area of ​​the screen assembly 100. The screen assembly 100 can hover at one-quarter and one-half of the maximum projection area. The projection screen 10 of this application can achieve multi-segment hovering, which improves the user's flexibility in selecting the projection area.

[0047] In some examples, please refer to [the relevant documentation / reference]. Figures 1 to 10 Please refer to Figure 11 , Figure 11 This is a schematic diagram of the operation of the push rod motor 500 of the projection screen 10 provided in this application embodiment. The projection screen 10 in this application embodiment also includes the push rod motor 500, which is disposed on one side of the locking assembly 400. The push rod motor 500 is used to push the pawl 420 to separate from the ratchet 410.

[0048] Understandably, the push rod motor 500 can be positioned along the second direction H2 on the side of the pawl 420 opposite to the ratchet 410, with the pawl 420 within the push rod stroke range of the push rod motor 500. The push rod motor 500 can push the pawl 420 via its push rod, allowing the pawl 420 to swing around a fixed axis, such as the fourth rotating axis 421, thereby separating the pawl 420 from the ratchet 410. The pawl 420 is no longer engaged or locked with the ratchet 410, and the ratchet 410 can rotate freely under the drive of the arm 200. At this time, the locking assembly 400 no longer provides locking force to the arm 200 and the curtain assembly 100, and the curtain assembly 100 can be rolled up and unfolded freely under the drive of the drive mechanism.

[0049] Understandably, when the screen assembly 100 is suspended in any preset position and the ratchet 410 is engaged with the pawl 420, if the screen assembly 100 needs to be retracted, the drive mechanism can first rotate to loosen the screen assembly 100; then the push rod motor 500 extends to push the pawl 420 out of the engagement state with the ratchet tooth 413; then the drive mechanism reverses to drive the screen assembly 100 to gradually retract; after the screen assembly 100 is completely retracted, the push rod motor 500 retracts, and the pawl 420 re-engages with the ratchet 410 under the action of the elastic element 430.

[0050] The projection screen 10 of this application can be driven by the push rod motor 500 to separate the pawl 420 from the ratchet 410 and release the locking state of the locking component 400. The projection screen 10 can achieve multiple hovering positions of the screen component 100 through the ratchet teeth 413 at different positions. Thus, under the combined action of the drive mechanism, the locking component 400 and the push rod motor 500, the screen component 100 can be raised, lowered and tensioned, and can be hovered and reset at any preset position. The solution of this application greatly improves the user's flexibility in selecting the projection area. Moreover, the push rod motor 500 of this application has a small load during operation, is not prone to abnormal noise, and has low noise. This application provides a projection screen 10 with a simple structure, reliability, low noise and stable operation.

[0051] It should be noted that the separation of the pawl 420 and the ratchet 410 can also be achieved in other ways. For example, the user can manually push the pawl 420 to separate from the ratchet 410. Another example is the separation of the pawl 420 and the ratchet 410 by magnetic attraction. This application does not limit the specific method of separating the pawl 420 and the ratchet 410.

[0052] In some examples, please refer again. Figures 1 to 3 The electronic device also includes a housing 600, which can be disposed on one side of the connection end 110 of the screen assembly 100, and the housing 600 is disposed on the upper side of the screen assembly 100. The connection end 110 of the screen assembly 100, the drive mechanism, the locking component 400, the push rod motor 500, and other structures can all be disposed and connected to the housing 600. For example, one end of the roller tube 140 of the screen body 130 is rotatably connected to the output shaft of the drive mechanism, and the other end of the roller tube 140 of the screen body 130 is fixed to the housing 600 by a roller tube bracket. The base 440 of the drive mechanism, the push rod motor 500, and the locking component 400 can be fixed to the housing 600 by, but is not limited to, screwing, riveting, or snap-fitting.

[0053] Understandably, the housing 600 can enclose the connection end 110, drive mechanism, locking component 400, push rod motor 500 and other structures of the screen assembly 100. From the outside, the connection end 110, drive mechanism, locking component 400, push rod motor 500 and other structures are all covered by the housing 600. The housing 600 can protect the above structures and also improve the aesthetics of the projection screen 10.

[0054] In some examples, please refer again. Figures 1 to 6The projection screen 10 of this embodiment includes at least two arms 200 and at least two locking components 400, the same number as the arms 200. Each of the at least two arms 200 and the at least two locking components 400 are arranged in a one-to-one correspondence. Each arm 200 is spaced apart and is used to move under the drive of a drive mechanism, thereby rotating the ratchet 410 of the corresponding locking component 400. Each locking component 400 can lock one arm 200 accordingly.

[0055] Understandably, in some examples, the projection screen 10 also includes at least two push rod motors 500, the same number as the arm 200, with each push rod motor 500 corresponding to at least two locking components 400, such that each push rod motor 500 is adapted to a locking component 400, and each push rod motor 500 can disengage the pawl 420 of the corresponding locking component 400 from the ratchet 410.

[0056] Understandably, in some examples, the projection screen 10 includes a first arm 200a, a second arm 200b, a first locking assembly 400a, a second locking assembly 400b, a first push rod motor 500a, and a second push rod motor 500b. The first arm 200a and the second arm 200b are spaced apart along a second direction H2. The first arm 200a is located near one edge of the screen body 130, and the second arm 200b is located near the other edge of the screen body 130. The two side edges of the screen body 130 are positioned opposite each other along the second direction H2. The first locking assembly 400a and the first push rod motor 500a are located near the first arm 200a. The ratchet 410 of the first locking assembly 400a is rotatably connected to the first connecting arm 210 of the first arm 200a. The first push rod motor 500a is used to disengage the ratchet 410 of the first locking assembly 400a from the pawl 420. The second locking assembly 400b and the second push rod motor 500b are disposed close to the second arm 200b. The ratchet 410 of the second locking assembly 400b is rotatably connected to the first connecting arm 210 of the second arm 200b. The second push rod motor 500b is used to separate the ratchet 410 of the second locking assembly 400b from the pawl 420.

[0057] It is understandable that, since the first connecting arm 210 of each arm 200 is rotatably connected to the connecting end 110 of the curtain assembly 100, the second connecting arm 220 of each arm 200 is rotatably connected to the winding end 120 of the curtain assembly 100, and the ratchet 410 of each locking assembly 400 is rotatably connected to the first connecting arm 210 of the arm 200, when the drive mechanism drives the curtain assembly 100 to move, each arm 200 can move together with the curtain assembly 100, and each ratchet 410 can rotate with the movement of the arm 200.

[0058] The projection screen 10 of this application can achieve the linkage of the screen assembly 100, all arms 200, and all ratchet 410 through a single drive mechanism. This solution eliminates the need for a drive motor for each arm 200, resulting in a simpler structure and lower cost. Furthermore, the screen assembly 100, arms 200, and ratchet 410 are synchronously linked, with essentially identical movement states between the multiple arms 200 and ratchet 410. Consequently, the screen assembly 100 is less prone to tilting, leading to more stable operation.

[0059] In some examples, please refer to Figure 12 , Figure 12 This is a schematic diagram of a connection of the angle detection component 700 of the projection screen 10 provided in an embodiment of this application. The projection screen 10 in this embodiment of the application also includes at least two angle detection components 700, the number of which is equal to the number of arms 200. The at least two angle detection components 700 are arranged in a one-to-one correspondence with the at least two arms 200, such that each angle detection component 700 is used to detect the opening angle of the corresponding arm 200.

[0060] It is understandable that when the drive mechanism drives the screen assembly 100 to unfold or retract, the screen assembly 100 will simultaneously drive the two connecting arms of the arm 200 to fold and unfold, resulting in a change in the opening angle between the two connecting arms. Therefore, there is a correlation between the opening angle of the two connecting arms of the arm 200 and the unfolded area of ​​the screen assembly 100. Since multiple arms 200 move synchronously with the screen assembly 100, their opening angles are theoretically the same. However, due to external forces or factors such as tilting of the movable cover 150 of the screen assembly 100, the opening angles of the multiple arms 200 may differ during actual operation, potentially causing the screen assembly 100 to tilt. The multiple angle detection components 700 of this application can detect the opening angle of the corresponding arm 200. When at least two angle detection components 700 detect different opening angles, it indicates that the screen assembly 100 is tilted. In this case, the projection screen 10 can retract the screen assembly 100 to a folded state and then unfold it again.

[0061] It is understood that the angle detection component 700 may include, but is not limited to, structures such as potentiometer-type angle sensors, encoder-type angle sensors, magnetoresistive angle sensors, Hall effect angle sensors, vibratory gyroscopes, and fiber optic gyroscopes. This application embodiment does not limit the specific structure of the angle detection component 700.

[0062] Understandably, in some examples, the angle detection component 700 of this application is a Hall effect angle sensor. The angle detection component 700 includes a magnet 710 and an angle sensor 720. Each angle sensor 720 is disposed on the ratchet 410 of the corresponding locking component 400, and each magnet 710 is disposed on the shaft of the corresponding ratchet 410. When the magnet 710 rotates with the shaft of the ratchet 410, the magnetic field strength and direction at the location of the angle sensor 720 change. The angle sensor 720 can sense this change and generate a corresponding Hall voltage. By measuring the magnitude and direction of the Hall voltage, the rotation angle of the magnet 710 can be determined, thereby obtaining the opening angle of the arm 200.

[0063] This application embodiment uses an angle detection component 700 to detect the opening angle of the arm 200. By determining whether the opening angles of multiple arms 200 are consistent, it can be determined whether the curtain assembly 100 is tilted. When the opening angles of multiple arms 200 are different, the locking component 400 of this application will not lock the arm 200. The user can roll up and adjust the curtain assembly 100 to unfold it again, and the locking component 400 will lock the spring arm to achieve tension of the curtain assembly 100. Therefore, this application provides a solution to prevent the curtain assembly 100 from tilting.

[0064] Based on the above description, this application also provides a projection device 40, please refer to... Figure 13 , Figure 13 This is a schematic diagram of a projection device 40 provided in an embodiment of this application. The projection device 40 includes a projection unit 20 and a projection screen 10 of any of the above embodiments. The projection unit 20 is used to project images onto the projection screen 10.

[0065] The projection device 20 may include, but is not limited to, projectors, mobile phones, tablets, laptops, desktop computers, game consoles, and other devices. Any device capable of projecting onto a projection screen can be the projection device 20 of this embodiment. When the screen body 130 of this application is installed inside the vehicle 50, if the projection device 20 is a projector, then the projector can also be installed in a suitable area of ​​the vehicle 50 for projection.

[0066] With the cooperation of the projection device 20 and the projection screen 10, the projection device 40 of the present application embodiment has a more stable tension state for the screen body 130 of the projection screen 10, and the projection device 40 has a better projection effect.

[0067] Based on the above description, this application also provides a vehicle 50, please refer to... Figure 14 , Figure 14This is a schematic diagram of a vehicle 50 provided in an embodiment of this application. The vehicle 50 includes a vehicle body 30 and a projection screen 10 of any of the above embodiments, the projection screen 10 being connected to the vehicle body 30.

[0068] According to the power source classification, the vehicle 50 in this application embodiment may include, but is not limited to, fuel vehicles, electric vehicles, new energy vehicles, hybrid vehicles, etc. According to the purpose classification, the vehicle 50 in this application embodiment may include, but is not limited to, passenger cars, commercial vehicles, special vehicles, etc. According to the vehicle type classification, the vehicle 50 in this application embodiment may include, but is not limited to, sedans, SUVs (Sport Utility Vehicles), MPVs (Multi-Purpose Vehicles), pickup trucks, etc. According to the drive method classification, the vehicle 50 in this application embodiment may include, but is not limited to, front-engine front-wheel drive vehicles, front-engine rear-wheel drive vehicles, mid-engine rear-wheel drive vehicles, four-wheel drive vehicles, etc.

[0069] The vehicle 50 in this embodiment can project images onto the screen 10, which can be an in-vehicle screen device, enriching the entertainment features of the vehicle 50. Moreover, when the screen body 130 of the projection screen 10 is unfolded, the screen body 130 can separate the front and rear rows of the vehicle 50, meeting the privacy needs of rear passengers.

[0070] It should be noted that the projection screen 10, projection device 40 and vehicle 50 in the embodiments of this application are different subjects under the same inventive concept. Features not described in detail in each embodiment can be referred to in the description of other embodiments. Under the premise of no conflict, the embodiments can be combined arbitrarily, and the combined solution is also within the protection scope of the embodiments of this application.

[0071] It should be noted that the term "multiple" in this application generally refers to two or more. Furthermore, directional terms used in the embodiments of this application, such as "up," "down," "front," "back," "left," "right," "inner," "outer," and "side," are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustrating and understanding the embodiments of this application, and not for limiting the embodiments of this application. The term "connection" in this application generally refers to a direct connection between two components or an indirect connection achieved through other components. In the various figures, structurally similar units are represented by the same reference numerals. For clarity, the various parts in the figures are not drawn to scale. Additionally, some related parts may not be shown in the figures.

[0072] It should be understood that in the description of this application, terms such as "first" and "second" are used only to distinguish similar objects and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0073] It is understood that those skilled in the art can combine various implementation methods in the above embodiments under the guidance of the above examples to obtain technical solutions with multiple implementation methods. The above descriptions are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

[0074] The projection screen, projection device, and vehicle provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A projection screen, characterized in that, include: The curtain assembly includes a connector and a winding end; The boom includes a hinged first connecting arm and a second connecting arm, wherein the first connecting arm is rotatably connected to the connecting end and the second connecting arm is rotatably connected to the winding end; A drive mechanism is connected to the connecting end and is used to drive the winding end to wind and unfold relative to the connecting end so that the first connecting arm and the second connecting arm fold and open. and The locking assembly includes a ratchet, a pawl, and an elastic element. The ratchet is rotatably connected to the first connecting arm and includes at least one ratchet tooth. One end of the elastic element is fixed and the other end is connected to the pawl, which is used to engage with the ratchet.

2. The projection screen according to claim 1, characterized in that, The projection screen includes at least two arms and at least two locking components equal in number to the number of arms, with each of the at least two locking components corresponding to one of the at least two arms. Each of the aforementioned arms is spaced apart and is used to move under the drive of the drive mechanism and drive the ratchet of the corresponding locking assembly to rotate.

3. The projection screen according to claim 2, characterized in that, The projection screen also includes at least two angle detection components, the number of which is equal to the number of the arms. The at least two angle detection components are configured in one-to-one correspondence with the at least two arms, and each angle detection component is used to detect the opening angle of the arm.

4. The projection screen according to claim 3, characterized in that, The angle detection component includes a magnet and an angle sensor. The angle sensor is disposed on the ratchet of the corresponding locking component, and the magnet is disposed on the rotating shaft of the ratchet.

5. The projection screen according to claim 1, characterized in that, The projection screen also includes a push rod motor, which is used to push the pawl to separate from the ratchet.

6. The projection screen according to any one of claims 1 to 5, characterized in that, The ratchet includes at least a first ratchet tooth and a second ratchet tooth, wherein the first ratchet tooth indicates that the screen assembly has one-quarter of the maximum projected area when it engages with the pawl; and the second ratchet tooth indicates that the screen assembly has one-half of the maximum projected area when it engages with the pawl.

7. The projection screen according to any one of claims 1 to 5, characterized in that, The curtain assembly includes a curtain body, a roller tube, and a movable cover plate. One end of the curtain body is connected to the roller tube to form the connecting end, and the other end of the curtain body is connected to the movable cover plate to form the winding end.

8. The projection screen according to any one of claims 1 to 5, characterized in that, The projection screen also includes a housing, and the connecting end, the driving mechanism, and the locking component are all connected to the housing.

9. A projection device, characterized in that, It includes a projection device and a projection screen as described in any one of claims 1 to 8, the projection device being used to project an image onto the projection screen.

10. A vehicle, characterized in that, It includes a vehicle body and a projection screen as described in any one of claims 1 to 8, wherein the projection screen is connected to the vehicle body.

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