Projection screen

Abstract

The invention discloses a projection screen which comprises a supporting seat, a curtain, a lifting mechanism and a locking mechanism, the curtain is connected to the supporting seat, and the curtain can be unfolded or rolled relative to the supporting seat. The lifting mechanism comprises a connecting piece and a lifting assembly, the other end of the curtain is connected to the connecting piece, the lifting assembly is provided with a first end and a second end, the first end is rotationally connected to the supporting base and provided with a transmission part, and the second end is rotationally connected to the connecting piece. The locking mechanism comprises a transmission assembly and a brake, the transmission assembly is in transmission connection with the transmission part, the brake is in transmission connection with the transmission assembly, and the brake is configured to limit transmission of the transmission assembly when the curtain is unfolded or rolled to any position so as to limit rotation of the first end and further lock the lifting assembly. According to the projection screen, the curtain can be suspended at any position, the lifting mechanism is locked, vibration and impact caused by movement are overcome, and the stability of the curtain is improved.

Description

Technical Field

[0001] The present application relates to the field of projection technology, and in particular to a projection screen. Background Art

[0002] As a device that can receive images projected by a projector, projection screens can be widely used in teaching, home, conference rooms, vehicles, etc. For example, with the increasing popularity of cars, cars are no longer limited to transportation tools, but terminal devices that can integrate multiple life functions, and car projection screens have emerged.

[0003] Current vehicle-mounted projection screens usually use a lifting mechanism to raise and lower the screen and provide tension to the screen so that the screen can remain flat for users to watch. However, current projection screens have poor anti-vibration effects in vehicle motion scenarios, and the screen is prone to shaking, affecting the user's viewing experience. Summary of the invention

[0004] The embodiment of the present application discloses a projection screen, which can make the screen hover at any position and lock the lifting mechanism to overcome the vibration and impact caused by the movement and improve the stability of the screen.

[0005] In order to achieve the above-mentioned purpose, the embodiment of the present application discloses a projection screen, comprising:

[0006] Support seat;

[0007] A curtain, one end of which is connected to the support base, and the curtain can be unfolded or rolled up relative to the support base;

[0008] A lifting mechanism, the lifting mechanism can be lifted relative to the support base to drive the curtain to be lifted relative to the support base, and the lifting mechanism includes:

[0009] A connecting piece, to which the other end of the curtain is connected;

[0010] A lifting assembly, the lifting assembly having a first end and a second end, the first end being rotatably connected to the support seat, the first end being provided with a transmission part, and the second end being rotatably connected to the connecting member;

[0011] A locking mechanism, the locking mechanism is arranged on the support seat, and the locking mechanism comprises:

[0012] A transmission assembly, the transmission assembly being transmission-connected to the transmission part;

[0013] A brake, which is in transmission connection with the transmission component, and is configured to limit the transmission of the transmission component when the curtain is deployed or retracted to any position, so as to limit the rotation of the first end, and further lock the lifting component.

[0014] For the projection screen provided in this application, since one end of the curtain is connected to the support base, and the other end is connected to the connecting piece of the lifting mechanism, the first end of the lifting component is rotatably connected to the support base, and the second end is rotatably connected to the connecting piece, such that the lifting component is connected to the curtain through the connecting piece, so that the curtain and the lifting mechanism have a linkage relationship during the lifting process. Thus, by providing a locking mechanism on the support base, and using the transmission component of the locking mechanism to be in transmission connection with the transmission part of the first end, a connection is established between the brake and the lifting component. Since the first end of the lifting component is rotatably connected to the support base, and the transmission part located at the first end is in transmission connection with the transmission component, in this way, when the first end of the lifting component rotates, it will drive the transmission part to rotate synchronously, and then drive the transmission component to move. Also, since the transmission component is connected to the brake, when the brake plays a braking role, it can limit the transmission of the transmission component. Thus, when the transmission component no longer transmits power, it will in turn limit the continuous rotation of the transmission part, thereby limiting the rotation of the first end, and further limiting the rotation of the lifting component. Through layer-by-layer reverse braking, the brake locks the lifting component when the curtain hovers at any position, so that the lifting component will not have vertical play, and provides sufficient tension to the curtain, so that the curtain can be locked by the lifting mechanism and remain stationary, which is beneficial to improving the overall earthquake resistance and shock resistance performance of the projection screen, and further beneficial to improving the user's viewing experience.

[0015] In addition, this application converts the rotation of the lifting component into the movement of the transmission component, and then transmits the power to the brake. By using this reverse braking method of using the brake to brake the transmission component to limit the lifting component, there is no need to additionally increase a driving source for braking, which can not only simplify the overall structure of the locking mechanism, but also is beneficial to reducing costs.

[0016] As an optional implementation manner, the transmission component includes:

[0017] A sliding member, which is slidably disposed on the support base, and the sliding member is in transmission connection with the transmission part. The transmission part rotates under the rotation action of the first end to drive the sliding member to move along a first direction, and the sliding member is provided with a first meshing tooth;

[0018] A transmission gear, which is meshed and connected with the first meshing tooth, and the transmission gear is also connected to the brake. The brake limits the rotation of the transmission gear to limit the movement of the sliding member, and further limits the rotation of the first end;

[0019] Wherein, the first direction is the width direction of the curtain.

[0020] During the lifting process of the curtain, the lifting assembly rotates, and the transmission part at the first end also rotates accordingly. Through the transmission connection between the transmission part and the sliding part, the rotational movement of the lifting assembly can be transformed into the horizontal movement of the sliding part. And through the meshing connection between the first meshing teeth on the sliding part and the transmission gear, the horizontal movement of the sliding part is transformed into the rotational movement of the transmission gear. Since the transmission gear is connected to the brake, when the curtain needs to hover, the rotation of the transmission gear is restricted by using the brake. Since the transmission gear meshes with the sliding part, the movement of the sliding part can also be restricted. And the sliding part is also in transmission connection with the transmission part, so the rotation of the first end can also be restricted, and further the rotation of the lifting assembly can be restricted, thereby realizing the locking of the lifting assembly.

[0021] During this braking process, due to the meshing connection between the transmission gear and the first meshing teeth of the sliding part, and the characteristic that each tooth of the transmission gear cooperates with each tooth of the sliding part during the rotation process, the brake can restrict the rotation of the transmission gear when the sliding part moves to any position, and further restrict the movement of the sliding part, without the need for the sliding part to move to a specified position before the brake can restrict the movement of the sliding part through the transmission gear. Thus, the lifting assembly can be locked when the curtain hovers at any position. By utilizing the meshing characteristic of the transmission gear and the first meshing teeth of the sliding part in this application, the hovering position of the curtain can be controlled more precisely, which is beneficial to improving the accuracy of the hovering position of the curtain.

[0022] As an alternative embodiment, the transmission part is configured as a toothed gear, the transmission part is located on the outer periphery of the first end, and the sliding part is further provided with second meshing teeth, and the second meshing teeth are meshed and connected to the transmission part.

[0023] By setting the transmission part as a toothed gear located on the outer periphery of the first end and providing second meshing teeth on the sliding part, the transmission part and the sliding part utilize the form of a gear and a rack to transform the rotation of the transmission part into the movement of the sliding part. The structure is simple, easy to implement, and can save space, making the layout more compact, so that the projection screen is more suitable for the scenario with limited space in a vehicle.

[0024] As an alternative embodiment, the locking mechanism further includes:

[0025] A housing, the housing is fixedly connected to the support base, and a part of the transmission gear is arranged in the housing;

[0026] The transmission gear includes:

[0027] A first rotating shaft, the first rotating shaft is rotatably connected to the housing;

[0028] A first gear, the first gear being fixedly connected to the first rotating shaft, and at least a part of the first gear being meshed and connected with the second meshing teeth;

[0029] A second rotating shaft, one end of the second rotating shaft being rotatably connected to the housing;

[0030] A second gear, the second gear being fixedly connected to the second rotating shaft, the second gear being meshed and connected with the first gear, the rotation speed of the second gear being less than the rotation speed of the first gear, the other end of the second rotating shaft being connected to the brake, and the brake being configured to limit the rotation of the second rotating shaft, and thus limit the rotation of the second gear.

[0031] By arranging the transmission gear in the housing and connecting each component of the transmission gear to the housing, it is equivalent to integrating the transmission gear into one component. In this way, after pre-assembling the transmission gear, the housing assembly can be integrally installed on the support base, making the assembly method more convenient. Moreover, it can avoid the situation that impurities enter the transmission gear and affect the movement of the transmission gear.

[0032] In addition, by setting the transmission gear to at least two sets of gears and making the rotation speed of the second gear less than the rotation speed of the first gear, that is, when it is transmitted to the second gear, the rotation speed of the second rotating shaft decreases and the torque increases. Then, the greater the rotational force that the transmission gear needs to overcome during rotation, at this time, the brake can limit the rotation of the second rotating shaft by applying a smaller braking force. Therefore, a smaller brake can be used to brake the rotation of the entire transmission gear, and then lock the lifting assembly, without overly occupying the space of the projection screen, which is beneficial to making the projection screen more miniaturized, and thus making the projection screen more adaptable to application scenarios such as vehicles.

[0033] As an alternative implementation manner, the support base includes:

[0034] A housing, the housing extending along the first direction, one end of the curtain being connected to the housing, and the curtain being unfoldable or retractable relative to the housing;

[0035] A mounting member, the mounting member being connected to the housing, the first end of the lifting assembly being rotatably connected to the mounting member, the sliding member being slidably disposed on the mounting member, and the sliding member being movable along the first direction.

[0036] By setting the support base to include a housing and a mounting member, using the housing to set up the curtain, and using the mounting member to connect with the lifting assembly, on the premise of being able to achieve the hinge connection of the lifting assembly, when the mounting member or the housing is damaged, only the damaged part needs to be replaced, rather than the whole support base, which is beneficial to saving the maintenance cost. Moreover, by using the mounting member to set up a slidable sliding member, it is more convenient for assembly and disassembly and maintenance.

[0037] As an alternative implementation, the mounting member is provided with a first avoidance opening and a second avoidance opening that are spaced along the first direction. The first avoidance opening corresponds to the first meshing tooth, and the second avoidance opening corresponds to the second meshing tooth.

[0038] A part of the transmission gear is inserted through the first avoidance opening and meshed with the first meshing tooth, and the transmission part is inserted through the second avoidance opening and meshed with the second meshing tooth.

[0039] Since the first end of the lifting assembly is rotatably connected to the mounting member, and the transmission part located at the first end is drivingly connected to the sliding member, therefore, by setting the first avoidance opening and the second avoidance opening on the mounting member, the transmission gear and the transmission part can both pass through the mounting member and be connected to the meshing teeth on the sliding member, so that the lifting assembly and the transmission gear are both arranged on the same side of the sliding member, avoiding the layout of these two parts being too scattered and overly occupying space, which is beneficial to the spatial layout of each part being more reasonable, more compact, and having a higher degree of integration. In addition, by respectively corresponding the first avoidance opening and the second avoidance opening to the meshing teeth, the situation of transmission failure caused by assembly error can be avoided.

[0040] As an alternative implementation, in the lifting direction of the curtain, the surface of the sliding member facing the mounting member is provided with a first through hole and a first groove. The first through hole penetrates the sliding member along the lifting direction of the curtain, and the first groove extends along the first direction to the first through hole and communicates with the first through hole.

[0041] The first meshing tooth is arranged in the first through hole, a part of the transmission gear is inserted through the first avoidance opening, the first through hole and meshed with the first meshing tooth, and the second meshing tooth is arranged in the first groove.

[0042] By setting the first through hole and the first groove on the sliding member, and respectively arranging the first meshing tooth and the second meshing tooth in the first through hole and the first groove, it is avoided that the meshing teeth protrude on the outer surface of the sliding member, resulting in an increase in the volume of the sliding member. In this way, the size of the sliding member will not be increased excessively, which is beneficial to reducing the volume of the sliding member, and further saves the space occupied on the support base.

[0043] In addition, by connecting the first groove and the first through hole in the first direction, when the length of the sliding member is fixed, the lengths of the first engaging teeth and the second engaging teeth can be set longer, so that the sliding member has sufficient engagement lengths with both the transmission part and the transmission gear, avoiding the situation where the brake cannot be locked when the lifting assembly rotates to the extreme positions of the fully unfolded or fully retracted curtain due to insufficient engagement length.

[0044] As an alternative implementation, a chute extending in the first direction is provided on the mounting member, and the sliding member is received in the chute and slidably connected to the chute.

[0045] Adopting the design with the mounting member being the chute and the sliding member being the slider can use the two sides of the chute of the mounting member to restrict the movement of the sliding member in the first direction, prevent lateral shaking, and improve the movement stability of the sliding member.

[0046] As an alternative implementation, in the lifting direction of the curtain, the mounting member has a first bottom surface facing the sliding member, a first guiding portion extending in the first direction is provided on the first bottom surface, the sliding member is provided with a second guiding portion, and the first guiding portion is cooperatively connected with the second guiding portion.

[0047] By providing mutually cooperating sliding portions on the sliding member and the mounting member to guide the moving direction of the sliding member, ensuring the consistency of the moving path of the sliding member, and making the transmission connection between the sliding member and the transmission gear and the transmission part stable, thereby ensuring the reliability of the braking process of the brake on the lifting assembly.

[0048] As an alternative implementation, the support seat includes:

[0049] A housing, one end of the curtain is connected to the housing, the housing has a receiving cavity, the curtain and the lifting mechanism can be received in the receiving cavity, and the locking mechanism is installed in the receiving cavity;

[0050] A mounting member, the mounting member is located in the receiving cavity and connected to the housing, and the first end of the lifting assembly is rotatably connected to the mounting member;

[0051] When the curtain is received in the receiving cavity, the connecting member is connected to the housing and covers the receiving cavity.

[0052] By providing a receiving cavity in the housing of the support base, the mounting parts, the screen, the lifting assembly and the locking mechanism of the lifting assembly for rotational connection are all stored in the receiving cavity, which can improve the overall appearance of the projection screen on the one hand, and integrate these parts into the housing on the other hand, which has a certain protective effect on these parts and facilitates the installation and transportation of the projection screen. It can be seen that the housing forms a box-like structure with an opening, and the connecting piece provided at the second end of the lifting assembly is connected to the housing and covers the receiving cavity, so that the connecting piece can serve as a cover of the housing to cover the opening of the housing, which can not only improve the aesthetics, but also prevent dust from entering the receiving cavity.

[0053] Compared with the prior art, the beneficial effects of this application are:

[0054] The projection screen provided by the present application has one end of the screen connected to a support seat and the other end connected to a connecting piece of a lifting mechanism. The first end of the lifting assembly is rotatably connected to the support seat and the second end is rotatably connected to the connecting piece, so that the lifting assembly is connected to the screen through the connecting piece, thereby making the screen and the lifting mechanism have a linkage relationship during the lifting process. Therefore, by arranging a locking mechanism on the support seat, and utilizing the transmission assembly of the locking mechanism to be transmission-connected with the transmission part of the first end, a connection is established between the brake and the lifting assembly. Since the first end of the lifting assembly is rotationally connected to the support seat, and the transmission part located at the first end is transmission-connected to the transmission assembly, the first end of the lifting assembly will drive the transmission part to rotate synchronously when rotating, thereby driving the transmission assembly to move. Since the transmission assembly is connected to the brake, the brake can limit the transmission of the transmission assembly when exerting a braking effect, thereby, when the transmission assembly does not continue to transmit power, the transmission part is in turn restricted from continuing to rotate, thereby restricting the rotation of the first end, thereby restricting the rotation of the lifting assembly. Through layers of reverse braking, the brake locks the lifting assembly when the curtain is suspended to any position, so that the lifting assembly will not move in the up and down directions, and sufficient tension is provided to the curtain, so that the curtain can be locked and kept motionless by the locking of the lifting mechanism, which is beneficial to improving the overall anti-seismic and anti-impact performance of the projection screen, thereby improving the viewing experience of the user.

[0055] In addition, the present application converts the rotation of the lifting assembly into the movement of the transmission assembly, and then transmits the power to the brake. The brake is used to brake the transmission assembly and thus limit the reverse braking of the lifting assembly. This method does not require an additional braking drive source, which not only simplifies the overall structure of the locking mechanism, but also helps to reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0057] Figure 1 Structural schematic diagram of the projection screen when it is retracted as disclosed in the present application;

[0058] Figure 2 For Figure 1 Exploded schematic diagram of the projection screen in

[0059] Figure 3 Structural schematic diagram of the projection screen when it is deployed as disclosed in the present application;

[0060] Figure 4 For Figure 3 Partial structural schematic diagram of the projection screen in

[0061] Figure 5 For Figure 1 Cross-sectional view and partial enlarged schematic diagram of the projection screen in

[0062] Figure 6 For Figure 3 Cross-sectional view and partial enlarged schematic diagram of the projection screen in

[0063] Figure 7 For Figure 6 Enlarged schematic diagram of part B in

[0064] Figure 8 For Figure 4 Enlarged schematic diagram of part A in

[0065] Figure 9 Structural schematic diagram of the locking mechanism as disclosed in the present application;

[0066] Figure 10 Exploded schematic diagram of the locking mechanism as disclosed in the present application;

[0067] Figure 11 Cross-sectional view of the connection between the lifting component and the locking mechanism as disclosed in the present application;

[0068] Figure 12 Exploded schematic diagram of the lifting component and the locking mechanism as disclosed in the present application;

[0069] Figure 13 Structural schematic diagram of the partial structural connection between the lifting component and the locking mechanism as disclosed in the present application;

[0070] Figure 14 Structural schematic diagram of the sliding member as disclosed in the present application;

[0071] Figure 15 The following is a schematic structural diagram of the projection screen disclosed in this application when applied to a projection device.

[0072] Explanation of the reference numerals in the drawings:

[0073] 100, projection screen; 10, support base; 11, outer shell; 11a, accommodation cavity; 11b, opening; 12, mounting member; 12a, first avoidance opening; 12b, second avoidance opening; 12c, sliding groove; 12d, first bottom surface; 12d1, first guiding portion; 121, second shaft hole; 122, connecting ear; 20, curtain; 30, winding mechanism; 31, reel; 32, driving member; 321, housing; 322, driving source; 323, output shaft; 40, lifting mechanism; 41, connecting member; 42, lifting assembly; 42a, first end; 42a1, first shaft hole; 42b, second end; 42c, transmission portion; 421, first support rod; 422, second support rod; 50, locking mechanism; 51, transmission assembly; 511, sliding member; 511a, first engaging tooth; 511b, second engaging tooth; 511c, first groove; 511d, first through hole; 511e, second guiding portion; 512, transmission gear; 5121, first rotating shaft; 5122, first gear; 5123, second rotating shaft; 5124, second gear; 5125, third gear; 5126, fourth gear; 52, brake; 53, housing; 531, upper housing; 532, lower housing; X, first direction; Z, lifting direction of the curtain; 200, projection device; 201, projector. Detailed implementation manners

[0074] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0075] In the present application, the orientation or positional relationship indicated by terms such as "upper", "inner", "outer", "front", "rear", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation or be constructed and operated in a specific orientation.

[0076] Moreover, in addition to being used to indicate orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0077] In addition, the terms "arranged", "provided with", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0078] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, components, or parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, components, or parts. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0079] As a device that can receive the image projected by a projector, a projection screen is widely used in teaching, home, meeting rooms, vehicles and other scenarios. Taking vehicles as an example, with the increasing popularity of cars, cars are no longer limited to being a means of transportation, but can be terminal devices integrating multiple life functions, and in-vehicle projection screens have emerged as the times require.

[0080] Currently, in-vehicle projection screens usually use a lifting mechanism to achieve the lifting of the screen. Specifically, the lifting mechanism is connected to the screen and can rise and fall as the screen unfolds, so as to provide tension for the screen and enable the screen to stop flat at the current position for users to watch. Since when the screen unfolds, in the case of vehicle movement, the tension of the lifting mechanism is not enough to overcome vibration or impact, the lifting mechanism may produce vertical movement, which may cause the screen to shake.

[0081] In order to improve the problem of the unstable screen of the projection screen in a moving scenario, a locking mechanism is usually used to limit the rotation of the lifting mechanism, so that the projection screen forms a stable frame structure, thereby enhancing the earthquake resistance performance of the screen.

[0082] However, the current limiting method usually locks the lifting mechanism when the screen is fully unfolded. When it is necessary for the screen to hover in an incompletely unfolded state, for example, when the screen only needs to be unfolded halfway, at this time, the locking mechanism cannot play a limiting role, and the lifting mechanism still has the problem of being prone to vertical movement, resulting in the tension of the lifting mechanism being insufficient to overcome the vibration and impact brought by movement, causing the screen to shake.

[0083] Based on this, the present application provides a projection screen. By providing a locking mechanism on the support base, the transmission component of the locking mechanism is in transmission connection with the transmission part at the first end, thereby establishing a connection between the brake and the lifting component. Since the first end of the lifting component is rotatably connected to the support base and the transmission part located at the first end is in transmission connection with the transmission component, thus, when the first end of the lifting component rotates, it will drive the transmission part to rotate synchronously, and then drive the transmission component to move. Also, since the transmission component is connected to the brake, when the brake exerts its braking effect, it can limit the transmission of the transmission component. Therefore, when the transmission component no longer transmits power, it will in turn limit the continued rotation of the transmission part, thereby restricting the rotation of the first end and further restricting the rotation of the lifting component. Through a series of reverse braking, the brake locks the lifting component when the curtain hovers at any position, so that the lifting component will not have vertical movement, and provides sufficient tension to the curtain, so that the curtain can be locked by the lifting mechanism and remain stationary, which is beneficial to improving the overall earthquake resistance and shock resistance performance of the projection screen, and further beneficial to improving the user's viewing experience.

[0084] The technical solution of the present application will be further described below in conjunction with embodiments and drawings.

[0085] Embodiments of the present application disclose a projection screen 100, which can be used to display projected image pictures. Among them, the projection screen 100 can be used as an in-vehicle screen in a vehicle, or can be used as a teaching screen in a classroom, or can be used as a movie screen in a home living room, etc.

[0086] Please refer to Figures 1 to 3 , in some embodiments, the projection screen 100 includes a support base 10. It can be understood that the support base 10 can be used as a support for the entire projection screen 100 and can be set on the ceiling, wall, vehicle roof or ground, etc.

[0087] In some embodiments, the projection screen 100 includes a curtain 20. One end of the curtain 20 is connected to the support base 10, and the curtain 20 can be unfolded or wound relative to the support base 10.

[0088] In some embodiments, the projection screen 100 includes a winding mechanism 30. The winding mechanism 30 is arranged on the support base 10. The winding mechanism 30 can be connected to one end of the curtain 20 for unfolding or winding the curtain 20. That is, one end of the curtain 20 can be connected to the support base 10 through the winding mechanism 30. Under the driving action of the winding mechanism 30, the curtain 20 can be unfolded or wound relative to the support base 10.

[0089] In some embodiments, the projection screen 100 includes a lifting mechanism 40. One end of the lifting mechanism 40 is rotatably connected to the support base 10, and the other end of the lifting mechanism 40 is connected to the curtain 20. The lifting mechanism 40 is vertically movable relative to the support base 10 to drive the curtain 20 to be vertically movable relative to the support base 10.

[0090] It can be understood that one end of the curtain 20 is connected to the support base 10 through a winding mechanism 30, and the other end of the curtain 20 is connected to the lifting mechanism 40. Then, the curtain 20 and the lifting mechanism 40 have a linkage relationship, and the lifting mechanism 40 can be lifted as the curtain 20 is deployed or wound up. Among them, the lifting of the lifting mechanism 40 means that one end of the lifting mechanism 40 connected to the curtain 20 changes in height relative to the support base 10 in the vertical direction Z of the curtain 20. Taking the example that the lifting mechanism 40 may include two interconnected support rods, the lifting here means that the two support rods are deployed or folded.

[0091] It should be noted that the curtain 20 may have a front side and a back side disposed opposite to each other. The front side of the curtain 20 is used to display an image screen, and the lifting mechanism 40 may be disposed on the back side of the curtain 20. With this arrangement, the lifting mechanism 40 not only does not affect the display, but also can hide the lifting mechanism 40, and the lifting mechanism 40 can provide a certain supporting effect for the curtain 20, making the curtain 20 flat and not easily curled.

[0092] In some embodiments, the lifting mechanism 40 includes a connecting member 41, and the other end of the curtain 20 is connected to the connecting member 41. Specifically, the other end of the curtain 20 may be connected to the support base 10 through a winding mechanism 30.

[0093] In some embodiments, the connecting member 41 is generally in a long strip shape and can extend along the first direction X. In the first direction X, the connecting member 41 extends from one side of the curtain 20 to the other side, so that the size of the connecting member 41 in the first direction X is substantially the same as that of the curtain 20, thereby enabling the connecting member 41 to better connect to the end of the curtain 20. Among them, the first direction X is the width direction of the curtain 20.

[0094] Combined with Figure 4 , in some embodiments, the lifting mechanism 40 includes a lifting assembly 42. The lifting assembly 42 has a first end 42a and a second end 42b. The first end 42a is rotatably connected to the support base 10, and the second end 42b is rotatably connected to the connecting member 41. That is, the lifting assembly 42 is connected to the curtain 20 through the connecting member 41, so that the lifting assembly 42 can be deployed as the curtain 20 is deployed or retracted as the curtain 20 is wound up.

[0095] It can be understood that the above-mentioned connecting member 41 can move synchronously with the lifting assembly 42. During the process of the lifting assembly 42 being gradually deployed or retracted, the connecting member 41 can descend or ascend accordingly.

[0096] In some embodiments, the projection screen 100 includes a locking mechanism 50 disposed on the support base 10. The locking mechanism 50 is configured to lock the lifting assembly 42 when the curtain 20 is deployed or retracted to any position.

[0097] It should be noted that the curtain 20 can have a fully deployed position, a fully retracted position, and intermediate positions between the two positions. Among them, the fully deployed position can mean that the curtain 20 is completely deployed from the winding mechanism 30, the curtain 20 has been deployed to the limit position, and the height of the curtain 20 will not change even if the winding mechanism 30 rotates further to deploy the curtain 20. Moreover, at this time, the rotation of the lifting assembly 42 has also reached the limit position. For example, when the lifting assembly 42 rotates relative to the support base 10 in a certain direction to the fully deployed position of the curtain 20 and the lifting assembly 42 cannot continue to rotate in this direction, then the fully deployed position of the curtain 20 can be used as the limit position for the lifting assembly 42 to rotate relative to the base in this direction. Of course, this direction can be the clockwise direction or the counterclockwise direction.

[0098] The fully retracted position of the curtain 20 can mean that the curtain 20 is completely wound on the winding mechanism 30, presenting a stored state, the curtain 20 has been retracted to the limit position, and at this time, the rotation of the lifting assembly 42 has also reached the limit position. For example, when the lifting assembly 42 rotates relative to the support base 10 in a certain direction to the fully retracted position of the curtain 20 and the lifting assembly 42 cannot continue to rotate in this direction, then the fully retracted position of the curtain 20 can be used as the limit position for the lifting assembly 42 to rotate relative to the base in this direction. Among them, this direction is opposite to the direction mentioned in the fully deployed position of the curtain 20 above.

[0099] Then, it can be understood that the locking mechanism 50 can not only lock the lifting assembly 42 at the fully deployed position of the curtain 20 or the fully retracted position of the curtain 20, but also lock the lifting assembly 42 at any intermediate position between these two limit positions. In this way, the function of the projection screen 100 can be made more diversified to adapt to more application scenarios.

[0100] For the projection screen 100 provided in the present application, since the lifting mechanism 40 can be lifted relative to the support base 10 to drive the curtain 20 to be liftable relative to the support base 10, that is, the curtain 20 and the lifting mechanism 40 are linked during the lifting process. By providing the locking mechanism 50 on the support base 10 and using the locking mechanism 50 to lock the lifting assembly 42 when the curtain 20 hovers at any position, the lifting assembly 42 can be kept stationary to provide sufficient tension for the curtain 20, so that the curtain 20 can be kept stationary by locking the lifting assembly 42, realizing no jitter of the curtain 20, and further being beneficial to improving the anti-vibration and anti-impact performance of the overall projection screen 100.

[0101] Specifically, when the projection screen 100 is in use, the winding mechanism 30 rotates to unfold the curtain 20. Since one end of the lifting component 42 is rotatably connected to the support base 10, and the other end of the lifting component 42 is connected to the curtain 20 through the connecting member 41, the lifting component 42 can unfold as the curtain 20 unfolds. When the curtain 20 unfolds to any position, the lifting component 42 is locked by the locking mechanism 50, so that the curtain 20 can be stably suspended at the current position. When the projection screen 100 is not in use, the locking mechanism 50 releases the lifting component 42, the winding mechanism 30 rotates to wind up the curtain 20, and the lifting component 42 is retracted as the curtain 20 is wound up.

[0102] It should be noted that the projection screen 100 provided in the embodiment of the present application can be installed at a high place, such as a high place on the wall, the ceiling or the top inside the vehicle, etc., so that the curtain 20 can unfold from top to bottom and be wound up from bottom to top. It can also be installed at a low place, such as the ground, the desktop, etc., so that the curtain 20 can unfold from bottom to top.

[0103] It can be understood that the locking mechanism 50 of the present application realizes locking by restricting the rotation of the lifting component 42. During the unfolding or winding of the curtain 20, the lifting component 42 rotates relative to the support base 10. Therefore, when the curtain 20 unfolds to any position, by restricting the rotation of the lifting mechanism 40 through the locking mechanism 50, the lifting of the lifting component 42 can be restricted, so that the lifting component 42 is locked at the current position and does not move up and down, making the lifting component 42 in a stable state.

[0104] In some embodiments, the lifting component 42 can be realized by using a plurality of support rods connected in a folding or unfolding manner. The plurality of support rods are connected to each other and rotate in a folding or unfolding manner as the curtain 20 unfolds or is wound up.

[0105] Exemplarily, in combination with Figures 2 to 4 , the lifting component 42 can include a first support rod 421 and a second support rod 422 that are rotatably connected to each other. The first support rod 421 and the second support rod 422 can have an unfolded state and a folded state. In the unfolded state, the first support rod 421 and the second support rod 422 are arranged at an angle. In the folded state, the first support rod 421 and the second support rod 422 are stacked together. Among them, the first support rod 421 has the first end 42a, the second support rod 422 has the second end 42b, the end of the first support rod 421 is rotatably connected to the support base 10, the end of the second support rod 422 is rotatably connected to the connecting member 41, and the locking mechanism 50 can be used to lock the first support rod 421 to restrict the rotation of the first support rod 421 relative to the support base 10.

[0106] For the convenience of explanation, take the direction in which the curtain 20 unfolds from top to bottom as an example. When the curtain 20 is in the fully retracted position, the first support rod 421 and the second support rod 422 are folded. During use, the winding mechanism 30 rotates to unfold the curtain 20, and one end of the curtain 20 connected to the connecting member 41 descends. During this process, the connecting member 41 descends, and the second support rod 422 rotates relative to the connecting member 41. At the same time, the first support rod 421 rotates relative to the second support rod 422 and the support base 10, and an included angle is formed between the first support rod 421 and the second support rod 422, and this included angle gradually increases, presenting the effect that the lifting assembly 42 is stretched in the height direction. When one end of the curtain 20 connected to the connecting member 41 descends to any position, the locking mechanism can limit the rotation of the first support rod 421. Since the second support rod 422 and the first support rod 421 are in a linkage relationship, the rotation of the second support rod 422 can also be limited, thereby enabling the locking of the lifting mechanism 40. Furthermore, the curtain 20 can be kept stationary by locking the lifting mechanism 40, providing sufficient tension for the curtain 20 to achieve no shaking of the curtain 20, thereby improving the overall earthquake resistance and impact resistance of the projection screen 100. When not in use, the locking mechanism 50 releases the restriction on the first support rod 421, and the first support rod 421 and the second support rod 422 return to a rotatable state. The winding mechanism 30 can wind the curtain 20, and one end of the curtain 20 connected to the connecting member 41 ascends. During this process, the second support rod 422 rotates relative to the connecting member 41. At the same time, the first support rod 421 rotates relative to the second support rod 422 and the support base 10, and the included angle formed between the first support rod 421 and the second support rod 422 gradually decreases, presenting the effect that the lifting assembly 42 is retracted in the height direction. After the curtain 20 is completely wound up to the fully retracted position, the first support rod 421 and the second support rod 422 are folded, and the overall size is small, which is convenient for storage.

[0107] It can be understood that two such lifting assemblies 42 may be included, and the two lifting assemblies 42 are arranged at intervals along the first direction X. By providing two lifting mechanisms 40, not only can the supporting effect on the unfolded curtain 20 be better, providing sufficient tension to make the curtain 20 flatter, but also the stability of the curtain 20 during the unfolding or winding process can be improved. Of course, as other examples, the number of the lifting assemblies 42 may also be more, such as three or more, and can be specifically designed according to the size of the curtain 20. This embodiment does not make specific limitations in this regard.

[0108] Of course, in some other embodiments, the lifting assembly 42 may further include a plurality of support rods to achieve lifting in a telescopic connection manner. Exemplarily, the lifting assembly 42 may include a first rod and a second rod. One end of the first rod is rotatably connected to the support base 10, the other end of the first rod is telescopic relative to the second rod, and the second rod is rotatably connected to the connecting member 41, that is, the lifting assembly 42 can be extended or contracted. When the second rod extends relative to the first rod, the second rod can drive the connecting member 41 to open the curtain 20. When the second rod contracts relative to the first rod, the second rod can drive the connecting member 41 to roll up the curtain 20.

[0109] Continuing to refer to Figures 2 to 4 , in some embodiments, the support base 10 includes a housing 11, and the housing 11 can be used as a mounting component of the winding mechanism 30.

[0110] In some embodiments, the housing 11 extends along the first direction X, one end of the curtain 20 is connected to the housing 11, and the curtain 20 can be unfolded or wound relative to the housing 11.

[0111] In some embodiments, the support base 10 includes a mounting member 12, and the mounting member 12 is connected to the housing 11. The first end 42a of the lifting assembly 42 is rotatably connected to the mounting member 12.

[0112] By setting the support base 10 to include the housing 11 and the mounting member 12, using the housing 11 to arrange the curtain 20 and using the mounting member 12 to connect with the lifting assembly 42, on the premise of being able to achieve the rotational connection of the lifting assembly 42, when the mounting member 12 or the housing 11 is damaged, only the damaged part needs to be replaced, and there is no need to replace the entire support base 10, which is beneficial to saving maintenance costs. Moreover, using the mounting member 12 to set the slidable sliding member 511 is more convenient for assembly and disassembly and maintenance.

[0113] Optionally, the above-mentioned mounting member 12 may be a block-shaped or plate-shaped structure, and the lifting assembly 42 is installed on the housing 11 through the mounting member 12. In addition, the number of the mounting members 12 is the same as the number of the lifting assemblies 42, and the first end 42a of each lifting assembly 42 is connected to the housing 11 through the mounting member 12.

[0114] Please refer to Figures 5 to 7 together. In some embodiments, the housing 11 has a receiving cavity 11a, the curtain 20 and the lifting mechanism 40 can be received in the receiving cavity 11a, and the locking mechanism 50 is installed in the receiving cavity 11a. Correspondingly, the winding mechanism 30, as an intermediate component connecting the curtain 20 and the housing 11, is also installed in the receiving cavity 11a. The mounting member 12 can also be located in the receiving cavity and connected to the housing 11.

[0115] It can be understood that the housing 11 has an opening 11b communicating with the accommodation cavity 11a, and the curtain 20 can be deployed from the accommodation cavity 11a through the opening 11b.

[0116] By providing the accommodation cavity 11a in the housing 11 of the support base 10, the mounting member 12 of the lifting assembly 42 for rotational connection, the curtain 20, the lifting assembly 42, and the locking mechanism 50 are all received in the accommodation cavity 11a. On the one hand, the overall appearance effect of the projection screen 100 can be improved. On the other hand, these components can be integrated into the housing 11, which has a certain protective effect on these components and facilitates the installation and handling of the projection screen 100.

[0117] In some embodiments, when the curtain 20 is wound up in the accommodation cavity 11a, the connecting member 41 is connected to the housing 11 and covers the accommodation cavity 11a.

[0118] It can be seen that the housing 11 forms a box-shaped structure with an opening 11b. At this time, the connecting member 41 provided at the second end 42b of the lifting mechanism 40 is connected to the housing 11 and covers the accommodation cavity 11a, so that the connecting member 41 can serve as the lid of the housing 11 to cover the opening 11b of the housing 11. This can not only improve the aesthetics but also prevent dust from entering the accommodation cavity 11a.

[0119] Combined with Figure 5 , in some embodiments, the winding mechanism 30 may include a reel 31 and a driving member 32. The reel 31 is connected to one end of the curtain 20 for deploying or winding up the curtain 20. One end of the reel 31 is rotatably connected to the support base 10, and the other end of the reel 31 is fixedly connected to the driving member 32, that is, the other end of the reel 31 is connected to the support base 10 through the driving member 32. Under the driving action of the driving member 32, the reel 31 is driven to rotate so that the curtain 20 is deployed or wound up.

[0120] Optionally, the driving member 32 may include a housing 321, a driving source 322, and an output shaft 323. The driving source 322 is disposed in the housing 321. The driving source 322 is connected to the output shaft 323 and is used to drive the output shaft 323 to rotate. The output shaft 323 is fixedly connected to the reel 31. During operation, the driving source 322 drives the output shaft 323 to rotate, and the output shaft 323 then drives the reel 31 to rotate. Exemplarily, the driving source 322 may include a motor and a reduction mechanism, and the motor is connected to the output shaft 323 through the reduction mechanism.

[0121] Of course, in some other embodiments, the curtain 20 can be directly connected to the support base 10 through the reel 31. The reel 31 can be rotatably connected to the support base 10, and the curtain 20 can be deployed or wound up relative to the support base 10 manually.

[0122] Combined with Figure 7 andFigure 8 In some embodiments, a transmission part 42c is provided at the first end 42a, and the transmission part 42c can be connected to a locking mechanism 50, and the locking mechanism 50 can limit the rotation of the lifting assembly 42 by restricting the transmission of the transmission part 42c.

[0123] As can be seen from the foregoing, the first support rod 421 has a first end 42a, that is, a transmission part 42c is provided at the end where the first support rod 421 is connected to the support base 10. Then, the first end 42a can be rotatably connected to the support base 10 to realize the rotational movement of the first support rod 421, and can also be drivingly connected to the locking mechanism 50 through the transmission part 42c. In this way, the locking mechanism 50 can conversely limit the rotation of the first end 42a by restricting the movement of the transmission part 42c, thereby restricting the rotation of the lifting assembly 42.

[0124] Combined with Figure 9 and Figure 10 In some embodiments, the locking mechanism 50 includes a transmission assembly 51, and the transmission assembly 51 is drivingly connected to the transmission part 42c.

[0125] In some embodiments, the locking mechanism 50 includes a brake 52, the brake 52 is drivingly connected to the transmission assembly 51, and the brake 52 is configured to restrict the transmission of the transmission assembly 51 when the curtain 20 is deployed or retracted to any position, so as to restrict the rotation of the first end 42a, and further lock the lifting assembly 42.

[0126] It can be understood that the transmission assembly 51 can serve as an intermediate component to establish the connection between the brake 52 and the lifting assembly 42, convert the rotational movement of the lifting assembly 42 into the movement of the transmission assembly 51, then connect the transmission assembly 51 to the brake 52, apply the braking effect of the brake 52 on the transmission assembly 51, and then transmit it to the lifting assembly 42 through the transmission part 42c.

[0127] The projection screen 100 provided in the present application has one end of the curtain 20 connected to the support base 10 and the other end connected to the connecting member 41 of the lifting mechanism 40. The first end 42a of the lifting component 42 is rotatably connected to the support base 10, and the second end 42b is rotatably connected to the connecting member 41, so that the lifting component 42 is connected to the curtain 20 through the connecting member 41, so that the curtain 20 and the lifting mechanism 40 have a linkage relationship during the lifting process. Therefore, by arranging the locking mechanism 50 on the support base 10, and utilizing the transmission assembly 51 of the locking mechanism 50 to be transmission-connected with the transmission part 42c of the first end 42a, a connection is established between the brake 52 and the lifting assembly 42. Since the first end 42a of the lifting assembly 42 is rotationally connected to the support base 10, and the transmission part 42c located at the first end 42a is transmission-connected to the transmission assembly 51, the first end 42a of the lifting assembly 42 will drive the transmission part 42c to rotate synchronously when rotating, thereby driving the transmission assembly 51 to move. Since the transmission assembly 51 is connected to the brake 52, the brake 52 can limit the movement of the lifting assembly 42 when exerting its braking effect. The transmission of the transmission component 51, when the transmission component 51 stops transmitting power, in turn limits the transmission part 42c from continuing to rotate, thereby limiting the rotation of the first end 42a, and further limiting the rotation of the lifting component 42. Through layers of reverse braking, the brake 52 locks the lifting component 42 when the screen 20 is suspended at any position, so that the lifting component 42 does not move in the up and down directions, and provides sufficient tension to the screen 20, so that the screen 20 can be locked and kept stationary by the lifting mechanism 40, which is beneficial to improving the overall anti-seismic and anti-impact performance of the projection screen 100, and further beneficial to improving the viewing experience of the user.

[0128] In addition, the present application converts the rotation of the lifting assembly 42 into the movement of the transmission assembly 51, and then transmits the power to the brake 52. The brake 52 is used to brake the transmission assembly 51 to limit the reverse braking method of the lifting assembly 42. There is no need to add an additional braking drive source 322. This not only simplifies the overall structure of the locking mechanism 50, but also helps to reduce costs.

[0129] Specifically, as in the aforementioned embodiment, when the lifting assembly 42 includes a first support rod 421 and a second support rod 422, the locking mechanism 50 limits the rotation of the first end 42a by limiting the transmission of the transmission assembly 51, thereby limiting the rotation of the first support rod 421. Since the second support rod 422 is in a linkage relationship with the first support rod 421, the rotation of the second support rod 422 can also be limited, and the overall rotation of the lifting assembly 42 can be limited, thereby locking the lifting assembly 42.

[0130] See also Figures 8 to 11, in some embodiments, the transmission assembly 51 includes a sliding member 511. The sliding member 511 is slidably disposed on the support base 10. The sliding member 511 is drivingly connected to the transmission part 42c. The transmission part 42c rotates under the rotation of the first end 42a to drive the sliding member 511 to move along the first direction X.

[0131] As can be seen from the foregoing, the support base 10 includes a housing 11 and a mounting member 12. Then, the sliding member 511 is slidably disposed on the mounting member 12, and the sliding member 511 is movable along the first direction X.

[0132] It should be noted that the sliding member 511 is mounted on the mounting member 12 and is located between the housing 11 and the mounting member 12 in the lifting direction Z of the curtain 20. In this way, not only can the mounting member 12 provide a supporting effect for the sliding member 511, but also the housing 11 can be used for a certain limit. Thus, in the lifting direction Z of the curtain 20, limiting effects are provided on both sides of the sliding member 511, enabling the movement of the sliding member 511 to be more reliable.

[0133] In some embodiments, the sliding member 511 is provided with a first engaging tooth 511a. It should be noted that the first engaging tooth 511a refers to a plurality of teeth arranged in a certain direction to form a rack with a certain length.

[0134] Combined with Figure 10 , in some embodiments, the transmission assembly 51 includes a transmission gear 512. The transmission gear 512 is meshingly connected to the first engaging tooth 511a. The transmission gear 512 is also connected to a brake 52. The brake 52 restricts the rotation of the transmission gear 512 to restrict the movement of the sliding member 511, and further restricts the rotation of the first end 42a.

[0135] It can be understood that the first engaging tooth 511a is arranged along the first direction X. Since the sliding member 511 moves along the first direction X under the action of the transmission part 42c, by aligning the arrangement direction of the first engaging tooth 511a with the movement direction of the sliding member 511, the rotation of the transmission gear 512 can be driven by the movement of the sliding member 511.

[0136] During the lifting and lowering process of the curtain 20, the lifting component 42 will rotate, and the transmission part 42c of the first end 42a will also rotate accordingly. Through the transmission connection between the transmission part 42c and the sliding part 511, the rotational movement of the lifting component 42 can be converted into the horizontal movement of the sliding part 511, and through the meshing connection between the first meshing teeth 511a on the sliding part 511 and the transmission gear 512, the horizontal movement of the sliding part 511 is converted into the rotational movement of the transmission gear 512. Since the transmission gear 512 is connected to the brake 52, when the curtain 20 needs to hover, the rotation of the transmission gear 512 is restricted by the brake 52. Since the transmission gear 512 meshes with the sliding part 511, the movement of the sliding part 511 can also be restricted. And the sliding part 511 is also in transmission connection with the transmission part 42c, so the rotation of the first end 42a can also be restricted, and further the rotation of the lifting component 42 is restricted, thereby realizing the locking of the lifting component 42.

[0137] During this braking process, due to the meshing connection between the transmission gear 512 and the first meshing teeth 511a of the sliding part 511, and the characteristic that each tooth of the transmission gear 512 cooperates with each tooth on the sliding part 511 during the rotation process, the brake 52 can restrict the rotation of the transmission gear 512 when the sliding part 511 moves to any position, and further restrict the movement of the sliding part 511, without the need for the brake 52 to restrict the movement of the sliding part 511 through the transmission gear 512 only when the sliding part 511 moves to a specified position. Thus, it is possible to lock the lifting component 42 when the curtain 20 hovers at any position. By utilizing the meshing characteristic between the transmission gear 512 and the first meshing teeth 511a of the sliding part 511 in this application, the hovering position of the curtain 20 can be controlled more precisely, which is beneficial to improving the accuracy of the hovering position of the curtain 20.

[0138] It should be noted that the sliding part 511 of this application moves along the first direction, and the axial direction of the transmission gear 512 is along the lifting direction Z of the curtain 20, that is, the transmission gear 512 is arranged vertically.

[0139] Refer to Figures 12 to 14 , in some embodiments, the transmission part 42c is configured as a tooth, the transmission part 42c is located on the outer periphery of the first end 42a, and the sliding part 511 is further provided with second meshing teeth 511b, and the second meshing teeth 511b are meshed and connected to the transmission part 42c.

[0140] By arranging the transmission part 42c as gear teeth located on the outer periphery of the first end 42a and arranging a second meshing tooth 511b on the sliding member 511, the transmission part 42c and the sliding member 511 utilize the form of a gear and a rack, converting the rotation of the transmission part 42c into the movement of the sliding member 511. The structure is simple, easy to implement, and can save space, making the layout more compact, so that the projection screen 100 is more suitable for the scenario with limited space in a vehicle.

[0141] It should be noted that the lifting assembly 42 rotates in a plane parallel to the curtain 20, that is, the first end 42a of the lifting assembly 42 rotates around a direction perpendicular to the first direction X and the lifting direction Z of the curtain 20.

[0142] The transmission part 42c is configured as gear teeth and is located on the outer periphery of the first end 42a. Here, the transmission part 42c can be continuously arranged around the outer periphery of the first end 42a for one week, or can be arranged on a part of the outer periphery of the first end 42a. Preferably, the transmission part 42c surrounds a part of the outer periphery of the first end 42a. Since when moving between the fully unfolded position of the curtain 20 and the fully retracted position of the curtain 20, the rotation angle of the lifting assembly 42 is usually less than 90 degrees. For example, when the lifting assembly 42 is in the fully unfolded position of the curtain 20, the unfolded angle is 60 degrees (the included angle between the first support rod 421 and the second support rod 422 is 60 degrees), that is, the lifting assembly 42 does not rotate for one week. Therefore, by arranging gear teeth only on a part of the outer periphery of the first end 42a, the space occupation can be saved on the premise of being able to realize meshing with the sliding member 511 to make the sliding member 511 move.

[0143] To realize the rotational connection between the lifting assembly 42 and the support base 10, in combination with Figure 13 , in some embodiments, the first end 42a is provided with a first shaft hole 42a1, and the support base 10 is provided with two second shaft holes 121. The first shaft hole 42a1 is located between the two second shaft holes 121. The first end 42a is rotationally connected to the support base 10 by a rotating shaft passing through the two second shaft holes 121 and the first shaft hole 42a1. Specifically, the support base 10 is provided with two oppositely arranged connecting ears 122, and the two connecting ears 122 are respectively provided with second shaft holes 121. The first end 42a is installed between the two connecting ears 122, so that the first shaft hole 42a1 corresponds to the two second shaft holes 121 respectively for the rotating shaft to pass through.

[0144] Of course, in other embodiments, the first end 42a may be configured as a rotating shaft. A third shaft hole is provided on the support base 10, and the first end 42a is rotatably connected to the third shaft hole, and a part of the first end 42a extends out of the third shaft hole. The transmission part 42c may be provided on the extending part of the first end 42a. Wherein, the transmission part 42c may include a first part and a second part. The first part is connected to the extending part of the first end 42a and extends along the radial direction of the first end 42a. The second part is connected to the end of the first part far from the first end 42a and extends along the axial direction of the first end 42a. A first limiting hole extending along the lifting direction Z of the curtain 20 is provided on the sliding member 511, and a second limiting hole is provided on the support base 10. The sliding member 511 slides along the first direction X and passes through the second limiting hole, and the second part is inserted into the first limiting hole. Under the rotation of the first end 42a, the second part moves in the first limiting hole, and under the action of the second limiting hole, the sliding member 511 is driven to move along the first direction X.

[0145] Combined with Figures 10 to 13 , in some embodiments, the locking mechanism 50 further includes a housing 53, and the housing 53 is fixedly connected to the support base 10. A part of the transmission gear 512 is disposed in the housing 53.

[0146] In some embodiments, the transmission gear 512 includes a first rotating shaft 5121, and the first rotating shaft 5121 is rotatably connected to the housing 53.

[0147] In some embodiments, the transmission gear 512 includes a first gear 5122, and the first gear 5122 is fixedly connected to the first rotating shaft 5121. At least a part of the first gear 5122 is meshed and connected with the second meshing tooth 511b.

[0148] In some embodiments, the transmission gear 512 includes a second rotating shaft 5123, and one end of the second rotating shaft 5123 is rotatably connected to the housing 53.

[0149] In some embodiments, the transmission gear 512 includes a second gear 5124, and the second gear 5124 is fixedly connected to the second rotating shaft 5123. The second gear 5124 is meshed and connected with the first gear 5122.

[0150] In some embodiments, the rotation speed of the second gear 5124 is less than that of the first gear 5122. The other end of the second rotating shaft 5123 is connected to the brake 52, and the brake 52 is configured to limit the rotation of the second rotating shaft 5123, thereby limiting the rotation of the second gear 5124. That is to say, the transmission gear 512 is a speed reduction gear mechanism. After the first gear 5122 transmits power to the second gear 5124, the rotation speed of the second gear 5124 is reduced.

[0151] By arranging the transmission gear 512 in the housing 53 and connecting the various components of the transmission gear 512 to the housing 53, it is equivalent to integrating the transmission gear 512 into one component. In this way, after the transmission gear 512 is pre-assembled, the housing 53 assembly can be integrally installed on the support base 10, making the assembly method more convenient. Moreover, it can prevent impurities from entering the transmission gear 512 and affecting the movement of the transmission gear 512.

[0152] In addition, by arranging the transmission gear 512 as at least two sets of gears and making the rotational speed of the second gear 5124 less than that of the first gear 5122, that is, when it is transmitted to the second gear 5124, the rotational speed of the second rotating shaft 5123 decreases and the torque increases. Then, the greater the rotational force that the transmission gear 512 needs to overcome during rotation. At this time, the brake 52 can apply a smaller braking force to limit the rotation of the second rotating shaft 5123. Thus, a smaller brake 52 can be used to brake the rotation of the entire transmission gear 512, and then lock the lifting assembly 42, without overly occupying the space of the projection screen 100, which is beneficial to making the projection screen 100 more miniaturized, so that the projection screen 100 is more suitable for application scenarios such as vehicles.

[0153] It should be noted that the brake 52 of the present application can be a friction brake 52, and the braking is achieved through the frictional force between the fixed element and the rotating element in the brake 52. Optionally, the brake 52 can include a power device, a transmission device, and a braking member (not shown). The transmission device transmits the braking energy to the braking member under the driving action of the power device. In the case of needing to brake, a frictional force is generated between the braking member and the second rotating shaft 5123 to hinder the rotation of the second rotating shaft 5123, thereby hindering the rotation of the transmission gear 512, and further hindering the movement of the sliding member 511, and finally hindering the rotation of the first end 42a. In this way, through layer-by-layer reverse braking, the braking effect on the lifting assembly 42 is achieved. The specific structure of this friction brake 52 can refer to disc brakes, drum brakes, etc. in related technologies, as long as it can meet the braking function. The specific structure is not limited in the embodiments of the present application.

[0154] It should be noted that the brake 52 of the present application can be a power-off brake 52, that is, under the action of power-off, the brake 52 starts the braking function. Exemplarily, during the normal unfolding process of the curtain 20, the brake 52 is powered on, the transmission gear 512 rotates, and the sliding member 511 moves along the first direction X under the rotation of the lifting assembly 42, thereby driving the transmission gear 512 to rotate. When it is necessary to suspend the curtain 20, the winding mechanism 30 no longer drives the curtain 20 to unfold. At this time, the brake 52 is powered off, and the friction between the friction plate and the transmission gear 512 cancels the rotation of the transmission gear 512, so that the transmission gear 512 stops rotating, thereby the sliding member 511 stops moving, and further the lifting assembly 42 stops rotating, realizing the braking effect.

[0155] It should be noted that the brake 52 of the present application is provided with a threshold trigger mechanism. When the required torque exceeds the set value due to collisions, overloads, mechanical failures, etc., for example, when the external force > 15 N·m, the brake 52 slides relative to the second rotating shaft 5123, which can prevent mechanical damage to the locking mechanism 50 and form a certain protection mechanism.

[0156] Optionally, the transmission gear 512 may further include a third gear 5125 and a fourth gear 5126. The third gear 5125 is meshed with the first gear 5122, the fourth gear 5126 is meshed with the third gear 5125, and is also meshed with the second gear 5124. The first gear 5122, the third gear 5125, the fourth gear 5126, and the second gear 5124 may be arranged in sequence along the first direction X, and through the transmission of the gears, the rotational speed gradually decreases and the torque increases. Through multi-stage gear transmission, the rotational speed transmitted to the gear shaft connected to the brake 52 is lower and the torque is greater. The brake 52 can limit the rotation of the second rotating shaft 5123 by applying a smaller braking force. For example, 0.4 N·m or 0.5 N·m can exert a braking effect on the transmission gear 512.

[0157] In addition, through the setting of multi-stage gears, the rotational speed can be gradually reduced to ensure the smoothness of the transmission. And through the setting of multi-stage gears along the first direction X, the distance between the brake 52 and the sliding member 511 can be elongated along the first direction X, avoiding the influence of space limitation on the layout of the brake 52 and making the overall part of the locking mechanism 50 more reasonable.

[0158] It can be seen that in the projection screen 100 of the present application, the space layout is limited. If the rotation of the lifting assembly 42 is directly braked, the brake 52 needs to provide a large braking force to achieve the braking effect. A brake 52 with a large braking force usually requires a larger power source, making the volume of the brake 52 relatively large. This not only excessively occupies space but also makes the overall projection screen 100 too heavy, which is not conducive to its application in a vehicle. Therefore, in the present application, the transmission gear 512 is set as a multi-stage transmission, so that the speed transmitted to the second gear 5124 is reduced and the torque is increased. Since the function of the brake 52 is to generate an opposite torque to counteract this torque, the brake 52 can exert an effective braking force with a smaller braking force. In this way, the brake 52 can be set to be smaller, thereby reducing the space occupation.

[0159] It can be understood that the third gear 5125 and the fourth gear 5126 are both provided with rotating shafts connected to the housing 53. For the specific connection method, reference can be made to the connection between the first gear 5122 and the first rotating shaft 5121, which will not be elaborated here.

[0160] For the convenience of installing the transmission gear 512, in some embodiments, continue to refer to Figure 10 , the housing 53 of the locking mechanism 50 may include an upper housing 531 and a lower housing 532. The gear shafts of the first gear 5122 to the fourth gear 5126 are all rotatably connected to the lower housing 532. The upper housing 531 is connected to the mounting member 12. Optionally, the upper housing 531 can be connected to the mounting member 12 by means of screwing, bonding or clamping.

[0161] As can be seen from the foregoing, in some embodiments, the locking mechanism 50 may include a brake 52 and a rotating assembly. By restricting the transmission of the transmission assembly 51 by the brake 52, the rotation of the first end 42a is restricted, thereby achieving the locking of the lifting assembly 42. Of course, in some other embodiments, the locking mechanism 50 may be a motor with a self-locking function, using the motor to directly drive the lifting assembly 42, that is, connecting the first end 42a of the lifting assembly 42 to the output shaft 323 of the motor, and achieving the locking of the lifting assembly 42 through the self-locking of the motor.

[0162] Since the sliding member 511 is located on the side of the mounting member 12 opposite to the lifting assembly 42, in order not to affect the transmission part 42c and the meshing of the transmission gear 512 with the sliding member 511, continue to refer to Figure 12 , in some embodiments, the mounting member 12 is provided with a first avoidance opening 12a and a second avoidance opening 12b spaced apart along the first direction X. The first avoidance opening 12a corresponds to the first meshing tooth 511a, and the second avoidance opening 12b corresponds to the second meshing tooth 511b.

[0163] In some embodiments, a part of the transmission gear 512 passes through the first avoidance opening 12a and is meshed and connected with the first meshing tooth 511a, and the transmission part 42c passes through the second avoidance opening 12b and is meshed and connected with the second meshing tooth 511b.

[0164] Since the first end 42a of the lifting assembly 42 is rotatably connected to the mounting member 12, and the transmission part 42c at the first end 42a is drivingly connected to the sliding member 511, therefore, by providing the first avoidance opening 12a and the second avoidance opening 12b on the mounting member 12, the transmission gear 512 and the transmission part 42c can both pass through the mounting member 12 and be connected to the meshing teeth on the sliding member 511. As a result, the lifting assembly 42 and the transmission gear 512 are both arranged on the same side of the sliding member 511, avoiding the layout of these two parts being too scattered and over-occupying space, which is beneficial to the spatial layout of each component being more reasonable, more compact, and having a higher degree of integration. In addition, by respectively arranging the first avoidance opening and the second avoidance opening 12b corresponding to the meshing teeth, the transmission failure caused by assembly errors can be avoided.

[0165] Combined Figure 11 and Figure 12 , in some embodiments, a chute 12c extending in the first direction X is provided on the mounting member 12, and the sliding member 511 is received in the chute 12c and slidably connected to the chute 12c.

[0166] By adopting the design that the mounting member 12 is the chute 12c and the sliding member 511 is the slider, the two sides of the chute 12c of the mounting member 12 can be used to restrict the sliding member 511 from moving along the first direction X, prevent lateral shaking, and improve the movement stability of the sliding member 511.

[0167] In order to prevent the sliding member 511 from moving along the first direction X and disengaging from the mounting member 12, a stop block is provided at at least one end of the mounting member 12 along the first direction X to limit the moving distance of the sliding member 511 and prevent the sliding member 511 from disengaging from the chute 12c.

[0168] In some embodiments, in the lifting direction Z of the curtain 20, the mounting member 12 has a first bottom surface 12d facing the sliding member 511, and a first guiding portion 12d1 extending along the first direction X is provided on the first bottom surface 12d. The sliding member 511 is provided with a second guiding portion 511e, and the first guiding portion 12d1 is cooperatively connected with the second guiding portion 511e.

[0169] By providing mutually cooperating sliding portions on the sliding member 511 and the mounting member 12 to guide the moving direction of the sliding member 511, ensuring the consistency of the moving path of the sliding member 511, and making the transmission connection between the sliding member 511 and the transmission gear 512 and the transmission part 42c stable, the reliability of the braking process of the brake 52 on the lifting assembly 42 is ensured.

[0170] Optionally, the first guiding portion 12d1 may be a groove, and the second guiding portion 511e may be a protrusion. Alternatively, the first guiding portion 12d1 may be a protrusion, and the second guiding portion 511e may be a groove, as long as the guiding function of the sliding member 511 can be satisfied. The specific structural form is not limited in the embodiments of the present application.

[0171] Referring to Figure 14 , in some embodiments, on the lifting direction Z of the curtain 20, the surface of the sliding member 511 facing the mounting member is provided with a first through hole 511d and a first groove 511c. The first through hole 511d penetrates the sliding member 511 along the lifting direction Z of the curtain 20, and the first groove 511c extends along the first direction X to the first through hole 511d and communicates with the first through hole 511d.

[0172] In some embodiments, the first engaging teeth 511a are disposed in the first through hole 511d, and a part of the transmission gear 512 passes through the first avoidance opening 12a and meshes with the first engaging teeth 511a in the first through hole 511d. The second engaging teeth 511b are disposed in the first groove 511c.

[0173] By providing the first through hole 511d and the first groove 511c on the sliding member 511 and disposing the first engaging teeth 511a and the second engaging teeth 511b in the first through hole 511d and the first groove 511c respectively, it is avoided that the engaging teeth protrude from the outer surface of the sliding member 511, resulting in an increase in the volume of the sliding member 511. In this way, the size of the sliding member 511 will not be increased excessively, which is beneficial to reducing the volume of the sliding member 511, and further saves the space occupied on the support base 10.

[0174] In addition, by communicating the first groove 511c and the first through hole 511d in the first direction X, when the length of the sliding member 511 is fixed, the lengths of the first engaging teeth 511a and the second engaging teeth 511b can be set longer, ensuring that there is sufficient meshing length between the sliding member 511 and the transmission part 42c and the transmission gear 512, and avoiding the situation that the brake 52 cannot be locked when the lifting assembly 42 rotates to the extreme position where the curtain 20 is fully unfolded or fully wound up due to insufficient meshing length.

[0175] Referring to Figure 15 , a structural diagram of applying the projection screen 100 to the projection device 200 is shown. The projection device 200 includes a projector 201 and the projection screen 100 as described in any of the above embodiments. The projector 201 can project projection light onto the projection screen 100 to display an image screen.

[0176] It can be understood that the projection device 200 with the above projection screen 100 also has all the technical effects of the above projection screen 100 pair. That is, the projection device 200 can make the curtain 20 hover at any position and lock the lifting mechanism 40, overcome the vibration and impact caused by movement, and improve the stability of the curtain 20. Since the above technical effects have been introduced in detail in the embodiments of the projection screen 100, they will not be elaborated here.

[0177] The above has introduced the projection screen disclosed in the embodiments of the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the projection screen of the present application and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A projection screen, characterized in that, Comprising: A support base; A curtain, one end of the curtain is connected to the support base, and the curtain can be deployed or wound relative to the support base; A lifting mechanism, the lifting mechanism can be lifted relative to the support base to drive the curtain to be lifted relative to the support base. The lifting mechanism includes: A connecting member, the other end of the curtain is connected to the connecting member; A lifting assembly, the lifting assembly has a first end and a second end. The first end is rotatably connected to the support base, a transmission part is provided at the first end, and the second end is rotatably connected to the connecting member; A locking mechanism, the locking mechanism is arranged on the support base. The locking mechanism includes: A transmission assembly, the transmission assembly is in transmission connection with the transmission part; A brake, the brake is in transmission connection with the transmission assembly, and the brake is configured to limit the transmission of the transmission assembly when the curtain is deployed or wound to any position, so as to limit the rotation of the first end, and further lock the lifting assembly.

2. The projection screen according to claim 1, wherein The transmission assembly includes: A sliding member, the sliding member is slidably arranged on the support base, the sliding member is in transmission connection with the transmission part, the transmission part rotates under the rotation action of the first end to drive the sliding member to move along a first direction, and a first meshing tooth is provided on the sliding member; A transmission gear, the transmission gear is meshed and connected with the first meshing tooth, the transmission gear is also connected to the brake, and the brake limits the rotation of the transmission gear to limit the movement of the sliding member, and further limits the rotation of the first end; Wherein, the first direction is the width direction of the curtain.

3. The projection screen according to claim 2, wherein The transmission part is configured as a gear tooth, the transmission part is located on the outer periphery of the first end, and a second meshing tooth is also provided on the sliding member, and the second meshing tooth is meshed and connected with the transmission part.

4. The projection screen according to claim 2, characterized in that, The locking mechanism further includes: A housing, the housing is fixedly connected to the support base, and a part of the transmission gear is arranged in the housing; The transmission gear includes: A first rotating shaft, the first rotating shaft is rotatably connected to the housing; A first gear, the first gear is fixedly connected to the first rotating shaft, and at least a part of the first gear is meshed and connected with the second meshing tooth; A second rotating shaft, one end of the second rotating shaft is rotatably connected to the housing; A second gear, the second gear is fixedly connected to the second rotating shaft, the second gear is meshed and connected with the first gear, the rotation speed of the second gear is less than the rotation speed of the first gear, and the other end of the second rotating shaft is connected to the brake, and the brake is configured to limit the rotation of the second rotating shaft, and further limit the rotation of the second gear.

5. The projection screen according to claim 3, characterized in that, The support base includes: An outer shell, the outer shell extends along the first direction, one end of the curtain is connected to the outer shell, and the curtain can be deployed or wound relative to the outer shell; A mounting member, the mounting member is connected to the outer shell, the first end of the lifting assembly is rotatably connected to the mounting member, the sliding member is slidably arranged on the mounting member, and the sliding member can move along the first direction.

6. The projection screen according to claim 5, wherein, The mounting member is provided with a first avoidance opening and a second avoidance opening which are arranged at intervals along the first direction. The first avoidance opening corresponds to the first meshing tooth, and the second avoidance opening corresponds to the second meshing tooth; A part of the transmission gear is disposed through the first avoidance opening and meshed with the first meshing tooth, and the transmission part is disposed through the second avoidance opening and meshed with the second meshing tooth.

7. The projection screen according to claim 6, characterized in that, In the lifting direction of the curtain, a first through hole and a first groove are provided on the surface of the sliding member facing the mounting member. The first through hole penetrates through the sliding member along the lifting direction of the curtain, and the first groove extends along the first direction to the first through hole and communicates with the first through hole; The first meshing tooth is disposed in the first through hole, a part of the transmission gear is disposed through the first avoidance opening, the first through hole and meshed with the first meshing tooth, and the second meshing tooth is disposed in the first groove.

8. The projection screen according to claim 5, wherein, The mounting member is provided with a sliding groove extending along the first direction, and the sliding member is received in the sliding groove and slidably connected to the sliding groove.

9. The projection screen according to claim 5, wherein In the lifting direction of the curtain, the mounting member has a first bottom surface facing the sliding member. A first guiding portion extending along the first direction is provided on the first bottom surface, and the sliding member is provided with a second guiding portion. The first guiding portion and the second guiding portion are cooperatively connected.

10. The projection screen according to claim 1, characterized in that, The support seat includes: A housing, one end of the curtain is connected to the housing. The housing has a receiving cavity, the curtain and the lifting mechanism can be received in the receiving cavity, and the locking mechanism is installed in the receiving cavity; A mounting member, the mounting member is located in the receiving cavity and connected to the housing, and the first end of the lifting assembly is rotatably connected to the mounting member; When the curtain is received in the receiving cavity, the connecting member is connected to the housing and covers the receiving cavity.

Images