Projection screen device and vehicle

Abstract

The application provides a projection curtain device and a vehicle. The projection curtain device comprises a top base, a curtain, an arm rod assembly, a driving assembly and a pipe winding assembly. The arm rod assembly comprises an upper arm rod and a lower arm rod. The upper arm rod is hinged to the top base and forms an upper hinge point. The upper arm rod is hinged to the lower arm rod and forms a middle hinge point. The lower arm rod is hinged to the bottom of the curtain and forms a lower hinge point. The arm rod assembly has a folding state and an unfolding state. The driving assembly is arranged on the top base and is used for driving the arm rod assembly. The pipe winding assembly is used for applying a tension to the curtain. The middle hinge point is configured such that, in the process of the arm rod assembly moving from the folding state to the unfolding state, the middle hinge point always does not cross the line connecting the upper hinge point and the lower hinge point. In this way, the problem of how to make the arm rod structure avoid shaking and abnormal sound in the unfolding process under the action of the continuous tension source of the curtain is solved, so as to take into account the flatness of the curtain and the appearance of the arm rod.

Description

Technical Field

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

[0002] With the gradual development of in-vehicle audio-visual entertainment systems, the application scenarios of projection screens inside vehicles are constantly expanding. In order to ensure that the screen can maintain its shape after being unfolded, a multi-link arm structure is generally used to support and guide the screen; and since the back of the screen is also completely exposed inside the vehicle, the arm structure is required to have a near-fully extended posture when fully unfolded to meet the overall aesthetic requirements.

[0003] However, among the commonly used methods in related technologies, one approach does not set a continuous tension source. As the arm structure straightens, there is no shaking or abnormal noise, but the curtain will wrinkle due to the lack of continuous tension. Another approach uses a tension source such as a power spring built into the roller assembly to continuously provide unidirectional tension. In conjunction with the arm structure, it can keep the curtain flat. However, when the arm is extended to full straightness, there will be a sudden change in the direction of force on the arm, which will cause the arm to shake and make abnormal noise. As a result, this solution is usually forced to limit the maximum extension angle of the arm and cannot achieve full straightness.

[0004] Therefore, under the continuous tension of the curtain, how to prevent the arm structure from shaking and making abnormal noises during the straightening process, so as to achieve both the flatness of the curtain and the appearance of the arm, has become a direction for research by those skilled in the art. Summary of the Invention

[0005] In view of this, this application provides a projection screen device and vehicle to solve the problem in the prior art of how to avoid shaking and abnormal noise of the arm structure during the straightening process under the action of the continuous tension force of the screen in order to balance the flatness of the screen and the appearance and posture of the arm.

[0006] To achieve the above objectives, this application provides the following technical solution: A projection screen device, comprising: Top seat; curtain; The arm assembly includes an upper arm and a lower arm. The upper arm is hinged to the top seat and forms an upper hinge point. The upper arm is hinged to the lower arm and forms a middle hinge point. The lower arm is hinged to the bottom of the curtain and forms a lower hinge point. The arm assembly has a folded state and an extended state. A drive assembly is disposed on the top seat and is used to drive the boom assembly; A roll-up assembly for applying tension to the curtain; The middle hinge point is configured such that, during the movement of the arm assembly from the folded state to the extended state, the middle hinge point never crosses the line connecting the upper hinge point and the lower hinge point.

[0007] Optionally, when the arm assembly is in the extended state, the middle hinge point is located inside the line connecting the upper hinge point and the lower hinge point, and the inner side is the side closer to the center of the curtain.

[0008] Optionally, the upper arm includes an upper arm portion and an upper connecting lug located at the top end of the upper arm portion, the upper connecting lug being hinged to the top seat; The lower arm includes a lower arm portion and a lower connecting lug located at the bottom end of the lower arm portion, and the lower connecting lug is hinged to the bottom of the curtain.

[0009] Optionally, the upper connecting ear is offset outward relative to the upper rod portion, and the outer side is the side away from the center of the curtain.

[0010] Optionally, the lower connecting ear is offset outward relative to the lower rod portion, and the outer side is the side away from the center of the curtain.

[0011] Optionally, the boom assembly further includes boom springs disposed in the upper boom and the lower boom, the boom springs applying force to the top end of the upper boom and the bottom end of the lower boom.

[0012] Optionally, the tube assembly includes a tube and a retraction spring disposed in the tube, the retraction spring being able to drive the curtain to retract to the circumference of the tube.

[0013] Optionally, the drive assembly drives the arm assembly to move via a connecting rod, which is connected below the upper hinge point.

[0014] Optionally, the curtain includes a fabric body and a suspension member connected to the bottom end of the fabric body; the lower arm is hinged to the suspension member.

[0015] A vehicle comprising the projection screen device described in any of the preceding claims.

[0016] The projection screen device provided in this application includes a top base, a screen, an arm assembly, a drive assembly, and a roll-up assembly. The arm assembly includes an upper arm and a lower arm. The upper arm is hinged to the top base to form an upper hinge point, the upper arm is hinged to the lower arm to form a middle hinge point, and the lower arm is hinged to the bottom of the screen to form a lower hinge point. The arm assembly has a folded state and an extended state. The drive assembly is located on the top base and is used to drive the arm assembly. The roll-up assembly is used to apply tension to the screen. The middle hinge point is configured such that, during the movement of the arm assembly from the folded state to the extended state, the middle hinge point never crosses the line connecting the upper and lower hinge points. This configuration ensures that the hinge point never crosses the line connecting the upper and lower hinge points during the entire process of the arm assembly moving from a folded state to an extended state. This prevents the resultant force on the arm from undergoing a sudden reversal, thus avoiding vibration and abnormal noise caused by abrupt changes in the force transmission direction. Furthermore, it allows the arm to extend to nearly 180°, improving the appearance while maintaining the curtain tension. This solves the problem in existing technologies of how to prevent vibration and abnormal noise during the extension process of the arm structure under the continuous tension of the curtain, in order to balance the flatness of the curtain and the appearance of the arm. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the boom assembly in the prior art.

[0019] Figure 2 The arm assembly provided in this application embodiment is a front view of the projection screen device in the extended state (perspective view of the screen).

[0020] Figure 3 The arm assembly provided in this application embodiment is a rear view of the projection screen device in the extended state.

[0021] Figure 4 The arm assembly provided in this application embodiment is a side view of the projection screen device in the extended state.

[0022] Figure 5 The arm assembly provided in this application embodiment is a top view of the projection screen device in its extended state.

[0023] Figure 6 for Figure 5 Sectional view at point AA.

[0024] Figure 7 The arm assembly provided in this application is a top view of the projection screen device in a folded state.

[0025] Figure 8 The arm assembly provided in this application is a side view of the projection screen device in a folded state.

[0026] Figure 9 This is a schematic diagram of the boom assembly in its extended state, as provided in an embodiment of this application.

[0027] Figure 10 This is a schematic diagram of the arm assembly in a folded state, as provided in an embodiment of this application.

[0028] exist Figures 2-10 middle: 10. Top mount; 20. Curtain; 30. Arm assembly; 40. Drive assembly; 50. Reel assembly; 60. Connecting rod; 70. Hinge mount; 21. Fabric body; 22. Hanging parts; 31. Upper boom; 32. Lower boom; 33. Boom spring; 301. Upper hinge point; 302. Middle hinge point; 303. Lower hinge point; 311. Upper rod section; 312. Upper connecting lug; 321. Lower rod section; 322. Lower connecting lug; 41. Sliding nut. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] In the field of projection screen devices, to ensure the screen maintains continuous tension and surface flatness during raising and lowering, the common approach is to use a retraction spring, supported by a foldable arm assembly. Specifically, the retraction spring applies a continuous tension force to the screen in the retraction direction via a coil tube. A drive assembly moves the arm assembly, composed of an upper and lower arm hinged together, from a folded state to an extended state, allowing the screen to gradually unfold under the tension. This solution relies on continuous tension to prevent wrinkles during raising and lowering, and is therefore widely used in applications where a perfectly flat screen appearance is required.

[0031] The applicant discovered that when the arm extension angle is required to be as close to 180° as possible to improve the visual effect when the screen is fully open, the following problems arise with this solution: Firstly, the tension provided by the retraction spring must be continuously maintained to keep the screen taut; secondly, during the arm assembly's movement from folding to straightening, the line connecting the upper hinge point formed by the upper arm and the top seat and the lower hinge point formed by the lower arm and the bottom of the screen will change position relative to the middle hinge point. In the structural layout of related technologies, the arm extension process includes a first segment and a second segment. In the first segment, the line connecting the upper and lower hinge points gradually approaches the middle hinge point from the inside (the side closer to the center of the screen) to the outside (the side farther from the center of the screen), but does not cross the middle hinge point. Due to the screen tension, the resultant force of the upper and lower arms at the middle hinge point is inward. In the second segment, the line connecting the upper and lower hinge points crosses the middle hinge point, such as... Figure 1 As shown, it continues to move outward. Due to the tension of the curtain, the resultant force of the upper and lower arms at the middle hinge point is directed outward. It can be seen that at the transition between the first and second segments, the resultant force direction of the arm assembly undergoes a sudden reversal. Due to the fit clearance in the mechanical structure, this sudden reversal of the force direction will cause vibration and abnormal noise, as well as disorder in the control logic of the drive assembly. This is because after passing the abrupt change point, the motor of the drive assembly needs to reverse to achieve force balance.

[0032] Based on the above, this application proposes a design for a projection screen device, such as... Figures 2-10The diagram shows the architecture of a projection screen device. This projection screen device includes a top mount 10, a screen 20, an arm assembly 30, a drive assembly 40, and a roll-up assembly 50. The top mount 10 is used to fix the entire device to a mounting base, such as the roof of a vehicle; the top mount 10 can be a box-shaped structure. The screen 20 has a fabric body 21 and a drape 22 located at the bottom end of the fabric body 21. The drape 22 extends along the width of the screen 20 and has a certain mass to facilitate maintaining the sag of the screen 20 under tension. The roll-up assembly 50 and the top mount 10 are arranged front and back in the horizontal direction. The roll-up assembly 50 includes a roll tube and a winding spring disposed inside the roll tube. The top end of the screen 20 is connected to and wound around the roll tube; the winding spring applies torque in the winding direction to the roll tube, so that the screen 20 is subjected to continuous tension at all positions when unfolded and folded. The arm assembly 30 is typically arranged in two symmetrical sets. Each arm assembly 30 includes an upper arm 31 and a lower arm 32. The top end of the upper arm 31 is hinged to the top seat 10 to form an upper hinge point 301. The bottom end of the upper arm 31 is hinged to the top end of the lower arm 32 to form a middle hinge point 302. The bottom end of the lower arm 32 is hinged to the hanging member 22 at the bottom of the curtain 20 to form a lower hinge point 303. A drive assembly 40 is mounted on the top seat 10 and connected to the arm assembly 30 via a connecting rod 60 located below the upper hinge point 301. When the drive assembly 40 operates, it drives the arm assembly 30 to move between a folded state and an extended state via the connecting rod 60, thereby pushing the bottom of the curtain 20 away from or towards the roller tube, thus enabling the curtain 20 to be extended or retracted.

[0033] For ease of understanding, in this application, the upper hinge point 301 generally refers to the part where the upper arm 31 and the top seat 10 form a rotatable connection, such as a hinge center formed by a pin or joint. This point is located in the area where the top end of the upper arm 31 mates with the top seat 10, and is the upper fulcrum for the arm assembly 30 to swing. The middle hinge point 302 generally refers to the part where the upper arm 31 and the lower arm 32 form a rotatable connection, such as a hinge center formed by a pin or joint. This point is located at the connection between the lower end of the upper arm 31 and the upper end of the lower arm 32, and is the intermediate joint for folding and straightening the arm assembly 30. The lower hinge point 303 generally refers to the part where the lower arm 32 and the bottom of the screen 20 form a rotatable connection, such as a hinge center formed by a pin or joint. This point is located at the connection between the bottom end of the lower arm 32 and the bottom of the screen 20, and is the lower fulcrum for the arm assembly 30 to swing. The folded state refers to the position where the arm assembly 30 is retracted and the curtain 20 is rolled up, with the upper arm 31 and lower arm 32 bent relative to each other. At this time, the distance between the upper hinge point 301 and the lower hinge point 303 is shortened, and the curtain 20 is in a rolled-up state. The extended state refers to the position where the arm assembly 30 is extended to a nearly 180° straight position. At this time, the upper arm 31 and lower arm 32 are roughly collinear, the curtain 20 is in a fully extended state, and the distance between the upper hinge point 301 and the lower hinge point 303 reaches its maximum.

[0034] This application provides a projection screen device, including a top base 10, a screen 20, an arm assembly 30, a drive assembly 40, and a roll tube assembly 50. The arm assembly 30 includes an upper arm 31 and a lower arm 32. The upper arm 31 is hinged to the top base 10 to form an upper hinge point 301, the upper arm 31 is hinged to the lower arm 32 to form a middle hinge point 302, and the lower arm 32 is hinged to the bottom of the screen 20 to form a lower hinge point 303. The arm assembly 30 has a folded state and an extended state. The drive assembly 40 is disposed on the top base 10 and is used to drive the arm assembly 30. The roll tube assembly 50 is used to apply tension to the screen 20. The middle hinge point 302 is configured such that, during the movement of the arm assembly 30 from the folded state to the extended state, the middle hinge point 302 never crosses the line connecting the upper hinge point 301 and the lower hinge point 303. Figure 9 and Figure 10 As shown, "crossing" describes the positional relationship of the middle hinge point 302 relative to the line connecting the upper hinge point 301 and the lower hinge point 303, meaning that the middle hinge point 302 moves from one side of the line to the other during the movement of the boom assembly 30; "never crossing" means that the middle hinge point 302 remains on the same side of the line throughout the entire movement, thereby avoiding a sudden reversal of the resultant force direction of the boom.

[0035] This configuration ensures that the hinge point 302 never crosses the line connecting the upper hinge point 301 and the lower hinge point 303 during the entire process of the arm assembly 30 moving from the folded state to the extended state. This prevents the resultant force on the arm from undergoing a sudden reversal, thus avoiding vibration and abnormal noise caused by sudden changes in the force transmission direction. Furthermore, it allows the arm to extend to a state close to 180°, achieving excellent appearance flatness and visual unity while maintaining the tension of the screen 20. This solves the problem in existing technologies of how to prevent vibration and abnormal noise during the extension process of the arm structure under the continuous tension of the screen 20 in order to balance the flatness of the screen 20 and the appearance of the arm.

[0036] It should be noted that the drive assembly 40 can be in the form of a motor-driven lead screw nut or a cylinder, etc.

[0037] To further ensure that no crossing occurs in the final straightened position, while also considering the folding angle, in some preferred embodiments, when the arm assembly 30 is in the straightened state, the middle hinge point 302 is located inside the line connecting the upper hinge point 301 and the lower hinge point 303, which refers to the side closer to the center of the screen 20. In other words, when the arm assembly 30 is straightened, the upper hinge point 301, the middle hinge point 302, and the lower hinge point 303 are not strictly collinear, but the middle hinge point 302 is slightly offset towards the center of the screen 20. This offset provides a safety margin for manufacturing and assembly tolerances. Even if there is a slight deviation between the actual position and the design position of the middle hinge point 302 due to manufacturing deviations of parts or hinge gaps, it can still be ensured that the middle hinge point 302 will not cross to the outside of the connecting line in the straightened state, thereby reliably avoiding a sudden change in force direction at the moment of straightening.

[0038] To achieve the kinematic constraints of the aforementioned hinge point 302, in some optional embodiments, the upper arm 31 includes an upper rod portion 311 and an upper connecting lug 312 located at the top of the upper rod portion 311. The upper connecting lug 312 is hinged to the top seat 10, thereby forming the upper hinge point 301. The lower arm 32 includes a lower rod portion 321 and a lower connecting lug 322 located at the bottom of the lower rod portion 321. The lower connecting lug 322 is hinged to the bottom of the curtain 20, thereby forming the lower hinge point 303. The upper rod portion 311 and the lower rod portion 321 serve as the main body of the arm, and the upper connecting lug 312 and the lower connecting lug 322 can be integrally formed at the top of the upper rod portion 311 and the bottom of the lower rod portion 321, respectively. The bottom of the top seat 10 and the curtain 20 are provided with hinge seats 70 for the connecting lugs to extend into, so as to form a reliable hinge using a pin.

[0039] As a specific way to ensure that the hinge point 302 does not cross the connecting line, in some optional embodiments, the upper connecting ear 312 is offset outward relative to the upper rod portion 311, with this outward offset being the side away from the center of the curtain 20. In other words, in the straightened state, the center of the hinge hole of the upper connecting ear 312 is located outside the axis of the upper rod portion 311, thereby shifting the upper hinge point 301 outward. The amount of outward shift of the upper hinge point 301, i.e., the vertical distance from the center of the upper hinge point 301 to the axis of the upper rod portion 311, is the offset amount in this embodiment. This offset amount can be determined comprehensively based on the total length of the arm assembly 30, the tension of the curtain 20, and the desired unfolding angle.

[0040] In addition, in conjunction with the outward shift of the upper hinge point 301, in some optional embodiments, the lower connecting ear 322 is offset outward relative to the lower rod portion 321, so that the lower hinge point 303 is also far away from the center of the screen 20. The offset amount of the lower connecting ear 322 is defined in the same way as the upper connecting ear 312. The offset of the lower connecting ear 322 can be the same as the offset of the upper connecting ear 312, or it can be a different value according to actual needs to optimize the movement trajectory of the middle hinge point 302. When the lower hinge point 303 is also offset outward, in the straightened state, the line connecting the upper hinge point 301 and the lower hinge point 303 is further pushed outward, making the middle hinge point 302 more reliably located inside the line, thereby ensuring that the middle hinge point 302 will never cross the line during the entire unfolding process.

[0041] During the deployment and retraction of the boom assembly 30, to ensure smoother boom movement and maintain a certain posture without driving force, in some optional embodiments, the boom assembly 30 further includes boom springs 33 disposed in the upper boom 31 and the lower boom 32. The boom springs 33 apply force to the top of the upper boom 31 and the bottom of the lower boom 32. This force can be configured as a tensile force or a supporting force, specifically designed according to the tension of the reel assembly 50. The boom spring 33 can be a helical spring, with its two ends connected to the hanging points inside the upper boom 31 near the upper hinge point 301 and the lower boom 32 near the lower hinge point 303, respectively. The middle portion can directly cross at the middle hinge point 302. The helical spring continuously applies tensile or supporting force to the top of the upper boom 31 and the bottom of the lower boom 32 to provide a boom posture-maintaining torque, assisting in smooth deployment and retraction. The direction of the force applied by the boom spring 33 is approximately along the longitudinal direction of the upper boom 31 and the lower boom 32. In some design conditions, if a tensile force is applied, this force generates a torque that tends to fold the arm assembly 30. This torque can partially offset the torque generated by the tension of the curtain 20 that tends to straighten the arm assembly 30, resulting in smoother driving action. Furthermore, when the drive assembly 40 is de-energized, the tension of the arm spring 33 can balance the torque transmitted from the winding tube assembly 50 to the arm assembly 30, allowing the arm assembly 30 to stably remain in any intermediate position, preventing the arm assembly 30 from accidentally straightening or folding completely due to the tension of the curtain 20 alone. In some design conditions, if a supporting force is applied, this supporting force can help resist the tension of the winding tube assembly 50 during the straightening process of the arm assembly 30, which helps reduce the load on the drive assembly 40, resulting in more stable output and lower operating noise.

[0042] The roll tube assembly 50 is a component that ensures the continuous tension of the curtain 20. In some specific embodiments, the roll tube assembly 50 includes a roll tube and a retraction spring disposed within the roll tube. The retraction spring applies tension to the curtain 20 in the retraction direction, keeping the curtain 20 flat regardless of whether it is unfolding or folding. The retraction spring can drive the curtain 20 to retract around the circumference of the roll tube. The outer surface of the roll tube is used to wind the curtain 20, and the retraction spring is housed inside. The retraction spring is a planar spiral spring.

[0043] When the drive assembly 40 drives the arm assembly 30, it needs to ensure effective transmission of driving force while avoiding interference from the drive connection structure with the offset of the upper hinge point 301. In some optional embodiments, the drive assembly 40 drives the arm assembly 30 through a connecting rod 60, which is connected below the upper hinge point 301. Specifically, one end of the connecting rod 60 can be hinged to the sliding nut 41 of the drive assembly 40, and the other end of the connecting rod 60 is hinged to a position on the upper arm 31 between the upper hinge point 301 and the top of the upper rod portion 311. In this way, when the sliding nut 41 is displaced, it drives the connecting rod 60 to rotate and displace, thereby causing the connecting rod 60 to drive the upper arm 31 to rotate. Since the drive connection point is located below the upper hinge point 301, the upper connecting lug 312 can be freely offset upwards without being obstructed by the connecting rod 60, thus completely preserving the outward offset geometry of the upper hinge point 301 and ensuring that the anti-crossing function is not damaged by the drive structure.

[0044] The bottom end of the curtain 20 directly bears the force of the lower arm 32 and the tension of the roll tube assembly 50. To ensure that these forces are evenly transmitted to the fabric 21 without causing damage, in some optional embodiments, the curtain 20 includes the fabric 21 and a drape 22 connected to the bottom end of the fabric 21. The lower arm 32 is hinged to the drape 22 to form a lower hinge point 303. The drape 22 can be a slender metal or plastic beam. The stiffness and strength of the drape 22 are significantly higher than those of the fabric 21, thus providing a stable hinge base for the lower arm 32, ensuring that the lower hinge point 303 remains in place during frequent unfolding and retraction movements, while evenly distributing the tension and unfolding thrust across the entire width of the curtain 20, avoiding stress concentration that could cause the fabric 21 to tear. Fixed hinge seats 70 can be provided at both ends of the drape 22 for hinged to the lower connecting lugs 322 via pins.

[0045] Based on the aforementioned projection screen device, this application also provides a vehicle, which includes a vehicle body and the aforementioned projection screen device, with the projection screen device mounted on the vehicle body. Since the vehicle has the aforementioned projection screen device, the beneficial effects brought to the vehicle by the projection screen device are described above and will not be repeated here.

[0046] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0047] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0048] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0049] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0050] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0051] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A projection screen device, characterized in that, include: Top seat (10); Curtain (20); The arm assembly (30) includes an upper arm (31) and a lower arm (32). The upper arm (31) is hinged to the top seat (10) and forms an upper hinge point (301). The upper arm (31) is hinged to the lower arm (32) and forms a middle hinge point (302). The lower arm (32) is hinged to the bottom of the curtain (20) and forms a lower hinge point (303). The arm assembly (30) has a folded state and an extended state. A drive assembly (40) is provided on the top seat (10) and is used to drive the boom assembly (30). A roll tube assembly (50) is used to apply tension to the curtain (20); The middle hinge point (302) is configured such that, during the process of the arm assembly (30) moving from the folded state to the straightened state, the middle hinge point (302) never crosses the line connecting the upper hinge point (301) and the lower hinge point (303).

2. The projection screen device according to claim 1, characterized in that, When the arm assembly (30) is in the extended state, the middle hinge point (302) is located inside the line connecting the upper hinge point (301) and the lower hinge point (303), and the inner side is the side close to the center of the curtain (20).

3. The projection screen device according to claim 1, characterized in that, The upper arm (31) includes an upper arm portion (311) and an upper connecting lug (312) located at the top of the upper arm portion (311), the upper connecting lug (312) being hinged to the top seat (10); The lower arm (32) includes a lower arm portion (321) and a lower connecting lug (322) located at the bottom end of the lower arm portion (321), the lower connecting lug (322) being hinged to the bottom of the curtain (20).

4. The projection screen device according to claim 3, characterized in that, The upper connecting ear (312) is offset outward relative to the upper rod (311), and the outer side is the side away from the center of the curtain (20).

5. The projection screen device according to claim 3, characterized in that, The lower connecting ear (322) is offset outward relative to the lower rod (321), and the outer side is the side away from the center of the curtain (20).

6. The projection screen device according to claim 1, characterized in that, The boom assembly (30) also includes boom springs (33) disposed in the upper boom (31) and the lower boom (32), the boom springs (33) applying force to the top of the upper boom (31) and the bottom of the lower boom (32).

7. The projection screen device according to claim 1, characterized in that, The tube assembly (50) includes a tube and a winding spring disposed in the tube, the winding spring being able to drive the curtain (20) to be wound around the tube.

8. The projection screen device according to claim 1, characterized in that, The drive assembly (40) drives the arm assembly (30) to move via the connecting rod (60), which is connected below the upper hinge point (301).

9. The projection screen device according to claim 1, characterized in that, The curtain (20) includes a fabric body (21) and a drape (22) connected to the bottom end of the fabric body (21); the lower arm (32) is hinged to the drape (22).

10. A vehicle, characterized in that, Includes the projection screen device as described in any one of claims 1-9.

Images