Projection screen

Abstract

The invention relates to the technical field of projection devices, and provides a projection screen. A lifting support of the projection screen is installed on a base and is configured to be capable of being lifted between a retracting posture and an unfolding posture in a switchable mode relative to the base, and a plurality of reinforcing devices are arranged on the lifting support. The curtain piece is provided with a first end and a second end which are oppositely arranged, the first end of the curtain piece is movably connected with the base, the second end of the curtain piece is fixedly connected with the lifting support, the curtain piece can be driven by the lifting support to be unfolded or folded, and the reinforcing device is used for being fixedly connected with the curtain piece in an opening state; the controller is electrically connected with the reinforcing device and used for controlling the reinforcing device to be started after the lifting support drives the curtain piece to be unfolded and controlling the reinforcing device to be closed before the lifting support drives the curtain piece to be retracted, so that the reinforcing device is fixedly connected with the curtain piece after the curtain piece is unfolded under the control of the controller. Therefore, the curtain sheet uses the lifting bracket as a supporting structure through the reinforcing device, and the stability and the wind resistance of the curtain sheet are improved.

Description

Technical Field

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

[0002] With the continuous development of science and technology, projection equipment is increasingly used in people's work and life. Projection equipment usually includes a projection host and a projection screen. The light outlet of the projection host faces the projection screen to emit a projection beam to the projection screen. The projection screen is used to receive the projection beam to display the picture. Projection screens are usually divided into drop-down projection screens and ground-lift projection screens. Drop-down projection screens usually roll up the screen and retract it into the top outer frame. During use, the screen unfolds and naturally droops to receive the projection beam; while ground-lift projection screens usually roll up the screen and retract it into the bottom base, where the base is installed on the ground. During use, the screen unfolds upward to receive the projection beam.

[0003] Compared with the drop-down projection screen, the floor-lift projection screen has the advantages of small size after storage, convenient transportation and installation, good integration with home places, and can be placed anywhere without leaning against the wall. However, during use, when the projection screen is blown by the wind, the wind blows vertically to the screen. The drop-down projection screen can be supported by leaning against the wall to reduce the impact of the wind, but the floor-lift projection screen cannot do this. After the screen of the floor-lift projection screen is unfolded, the screen mainly relies on the upward and downward pulling force generated between the lifting bracket and the base on its back for support, which makes the screen easily affected by the force, resulting in poor windproof effect and stability of the floor-lift projection screen. Summary of the invention

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

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

[0006] Pedestal;

[0007] a lifting bracket, mounted on the base, configured to be switchably lifted and lowered between a retracted posture and an extended posture relative to the base, and the lifting bracket is provided with a plurality of reinforcing devices;

[0008] The curtain piece has a first end and a second end which are arranged opposite to each other, the first end of the curtain piece is movably connected to the base, the second end of the curtain piece is fixedly connected to the lifting bracket, the curtain piece is configured to be unfolded or retracted under the drive of the lifting bracket, and the reinforcing device is used to be connected and fixed to the curtain piece in the opened state;

[0009] A controller is electrically connected to the reinforcing device, and is used to control the reinforcing device to be in an open state after the lifting bracket drives the curtain piece to be unfolded, and to control the reinforcing device to be in a closed state before the lifting bracket drives the curtain piece to be retracted.

[0010] Optionally, after the curtain piece is unfolded, the first end of the curtain piece in the height direction is subjected to the pulling force of the base, and the second end of the curtain piece in the height direction is subjected to the pulling force of the lifting bracket, and the reinforcing device is located in the area between the first end and the second end of the curtain piece in the height direction.

[0011] Optionally, the curtain piece has a first edge region and a second edge region that are arranged opposite to each other, and the first edge region and the second edge region both extend along a height direction of the curtain piece after it is unfolded;

[0012] At least one of the reinforcing devices is connected and fixed to the first edge region, and at least one of the reinforcing devices is connected and fixed to the second edge region.

[0013] Optionally, after the curtain piece is unfolded, with the base as the zero point height, the area between 1 / 3 and 2 / 3 of the height of the curtain piece along the height direction is the reinforcement area, and the reinforcement device is located in the reinforcement area.

[0014] Optionally, a plurality of the reinforcing devices are arranged at intervals along the width direction of the unfolded curtain piece, and the plurality of the reinforcing devices are all located in a region between a first end and a second end of the curtain piece along the height direction.

[0015] Optionally, the reinforcing device includes an electromagnet, and a magnetic attraction portion is provided on at least a portion of the curtain piece corresponding to the electromagnet. After the curtain piece is unfolded, the electromagnet is magnetically fixed to the magnetic attraction portion at the corresponding portion.

[0016] Optionally, the curtain piece has a first edge region and a second edge region that are arranged opposite to each other, and the first edge region and the second edge region both extend along a height direction of the curtain piece after it is unfolded;

[0017] The lifting bracket includes a fixed end and at least two sub-lifting brackets, wherein the at least two sub-lifting brackets are arranged between the fixed end and the base, the first end of the curtain piece is movably connected to the base, and the second end of the curtain piece is fixedly connected to the fixed end;

[0018] The at least two sub-lifting frames are arranged at intervals along the width direction of the curtain piece, one of the sub-lifting frames corresponds to the first edge area of ​​the curtain piece after it is unfolded, and at least one of the sub-lifting frames is provided with the reinforcing device, and one of the sub-lifting frames corresponds to the second edge area of ​​the curtain piece after it is unfolded, and at least one of the sub-lifting frames is provided with the reinforcing device.

[0019] Optionally, the number of the sub-lifting frames is two, which respectively correspond to the first edge area and the second edge area after the curtain piece is unfolded, and at least one reinforcing device is disposed on each of the two sub-lifting frames;

[0020] An auxiliary bracket is provided between the two sub-lifting frames. The auxiliary bracket is connected between the two sub-lifting frames after the curtain piece is unfolded. At least one reinforcing device is provided on the auxiliary bracket.

[0021] Optionally, the curtain piece is provided with a plurality of reinforcing members, the reinforcing members are extended along the width direction of the unfolded curtain piece, the plurality of reinforcing members are sequentially arranged along the height direction of the unfolded curtain piece, and the reinforcing device is connected and fixed to the reinforcing members when activated.

[0022] Optionally, a wind sensor is provided on the base or the lifting bracket, and the wind sensor is used to detect the wind level of the environment in which the projection screen is located. The wind sensor is electrically connected to the controller, and the controller is used to adjust the connection strength between the reinforcing device and the screen piece according to the wind level detected by the wind sensor.

[0023] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0024] The projection screen provided by the present disclosure comprises a base, a lifting bracket, a screen piece and a controller. The first end of the screen piece is movably connected to the base, and the second end of the screen piece is fixedly connected to the lifting bracket. The lifting bracket can be lifted and lowered switchably between a retracted posture and an extended posture relative to the base to drive the screen piece to be extended or retracted, thereby realizing the function of extending the screen piece of the projection screen when in use and retracting the screen piece of the projection screen when not in use. The lifting bracket is provided with a plurality of reinforcing devices, and the controller is electrically connected to the reinforcing devices. The controller is used to control the reinforcing devices to be in an open state after the lifting bracket drives the screen piece to be extended, so that the reinforcing devices are connected and fixed to the screen piece; and to control the reinforcing devices to be in a closed state before the lifting bracket drives the screen piece to be retracted, so that the reinforcing devices are The device is no longer connected and fixed to the screen piece; in this way, the reinforcing device is connected and fixed to the screen piece under the control of the controller after the screen piece is unfolded, so that the screen piece uses the lifting bracket as a supporting structure through the reinforcing device, thereby improving the stability and wind resistance of the screen piece, avoiding the screen piece from curling due to wind and affecting the display effect of the image on the screen piece, and controlling the reinforcing device to be in a closed state through the controller before the screen piece is retracted, so that the reinforcing device is no longer connected and fixed to the screen piece, thereby avoiding the connection and fixation of the reinforcing device to the screen piece interfering with the unfolding and retracting action of the screen piece, thus improving the windproof effect of the projection screen, and ensuring that the setting of the reinforcing device does not affect the normal unfolding and retracting function of the screen piece of the projection screen, thereby improving the user experience of the projection screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] Figure 1 This is a schematic diagram of the structure of a projection screen according to an embodiment of the present disclosure after the screen piece is removed;

[0028] Figure 2 A side view of a projection screen according to an embodiment of the present disclosure when the screen is unfolded;

[0029] Figure 3 A top view of a projection screen according to an embodiment of the present disclosure when the screen piece is unfolded;

[0030] Figure 4 A front view of a projection screen according to an embodiment of the present disclosure when the screen is unfolded;

[0031] Figure 5 A front view of another projection screen according to an embodiment of the present disclosure when the screen is unfolded;

[0032] Figure 6 A front view of another projection screen according to an embodiment of the present disclosure when the screen is unfolded;

[0033] Figure 7 A front view of a screen piece of another projection screen according to an embodiment of the present disclosure when the screen piece is unfolded;

[0034] Figure 8 It is a schematic diagram of the structure of a projection screen according to an embodiment of the present disclosure when the screen piece is retracted;

[0035] Fig. 9 It is a front view of a projection screen according to an embodiment of the present disclosure when the screen piece is retracted;

[0036] Fig.10 A side view of a projection screen according to an embodiment of the present disclosure when the screen is retracted;

[0037] Fig.11 This is a simulation result diagram of the curtain piece according to the embodiment of the present disclosure without a reinforcement device;

[0038] Fig.12 A simulation result diagram showing that a reinforcing device is provided in the first edge region and the second edge region of the curtain piece according to the embodiment of the present disclosure;

[0039] Fig.13 A diagram showing simulation results of the screen piece according to an embodiment of the present disclosure having two reinforcing devices disposed in the first edge region and the second edge region respectively;

[0040] Fig.14 A simulation result diagram of the screen piece according to the embodiment of the present disclosure, in which two reinforcing devices are respectively arranged in the first edge region and the second edge region, and one reinforcing device is arranged in the middle region;

[0041] Fig.15 After the curtain piece according to the embodiment of the present disclosure is provided with a reinforcement piece, a simulation result diagram of providing a reinforcement device in the first edge region and the second edge region respectively.

[0042] Among them, 1. base; 2. lifting bracket; 21. fixed end; 22. sub-lifting bracket; 221. lifting rod; 23. auxiliary bracket; 3. reinforcement device; 31. wire; 4. curtain piece; 41. reinforcement piece. DETAILED DESCRIPTION

[0043] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0045] Reference Figures 1 to 10 As shown, an embodiment of the present disclosure provides a projection screen, including a base 1, a lifting bracket 2, a screen 4 and a controller.

[0046] Among them, the lifting bracket 2 is installed on the base 1 and is configured to be switchably lifted and lowered between a retracted posture and an extended posture relative to the base 1. A plurality of reinforcing devices 3 are provided on the lifting bracket 2, and the reinforcing devices 3 are used to be connected and fixed with the curtain piece 4 in an open state; the curtain piece 4 has a first end and a second end that are relatively arranged, the first end of the curtain piece 4 is movably connected to the base 1, and the second end of the curtain piece 4 is fixedly connected to the lifting bracket 2, and the curtain piece 4 is configured to be able to be extended or retracted under the drive of the lifting bracket 2; the controller is electrically connected to the reinforcing device 3, and the controller is used to control the reinforcing device 3 to be in an open state after the lifting bracket 2 drives the curtain piece 4 to be extended, and to control the reinforcing device 3 to be in a closed state before the lifting bracket 2 drives the curtain piece 4 to be retracted.

[0047] Specifically, the projection screen can be selected as a ground-lift projection screen. The base 1 is used to be placed on the ground, and the lifting bracket 2 rises or falls in the vertical direction to drive the screen 4 to unfold or retract. When the base 1 is placed on the ground or on the floor, the side of the base 1 close to the ground is the bottom surface, and the side of the base 1 away from the bottom surface is the top surface. The interior of the base 1 is hollow and has a space for accommodating the screen 4. An opening is provided on the top surface of the base 1, and the screen 4 enters the interior of the base 1 and extends out from the interior of the base 1 through the opening. The lifting bracket 2 rises to drive the screen 4 to unfold, and the lifting bracket 2 falls to drive the screen 4 to retract and fold. The projection screen is in a working state when the screen 4 is unfolded, so that the screen 4 can receive the projected image.

[0048] A reel may be optionally provided inside the above-mentioned base 1. After the curtain piece 4 is connected to the reel, when the curtain piece 4 is retracted into the base 1, the reel rotates to reel the curtain piece 4 onto the base 1. Of course, the curtain piece 4 may also be stacked inside the base 1. The lifting bracket 2 may be selected as a scissor-type bracket, one end of which is movably connected to the base 1, and the other end extends vertically upward. The end of the scissor-type bracket away from the base 1 is connected to the end of the curtain piece 4, so that when the scissor-type bracket is extended and retracted in the vertical direction, the end of the curtain piece 4 is driven to move in the vertical direction to realize the deployment and recovery of the curtain piece 4.

[0049] Of course, the lifting bracket 2 can also be selected to be a lead screw structure driven by a motor, or a telescopic rod connected to the telescopic end of the cylinder, and the telescopic rod is driven by the cylinder to move in the vertical direction to drive the curtain piece 4 to be extended and retracted, as long as the lifting bracket 2 can move up and down in the vertical direction, drive the curtain piece 4 to extend from the inside of the base 1 to be extended, and drive the curtain piece 4 to return to the inside of the base 1 to be retracted.

[0050] The lifting bracket 2 mentioned above rises to make the screen piece 4 extend from the inside of the base 1. When the screen piece 4 is fully extended from the inside of the base 1 to form a plane that can receive the projection, the spatial position of the end of the lifting bracket 2 away from the base 1 is the deployed position. The end of the lifting bracket 2 away from the base 1 moves from the deployed position toward the base 1, and the screen piece 4 moves toward the inside of the base 1 along with the end of the lifting bracket 2 away from the base 1. When the screen piece 4 is fully retracted into the inside of the base 1, the position of the end of the lifting bracket 2 away from the base 1 is the storage position; the movement of the end of the lifting bracket 2 away from the base 1 between the deployed position and the storage position can be selected by a motor or a cylinder as a driving force.

[0051] Furthermore, a plurality of reinforcing devices 3 are arranged on the lifting bracket 2. The reinforcing devices 3 can be selected as electromagnets. The screen piece 4 is processed to have magnetism, so that the controller controls the electromagnets of the reinforcing devices 3 to adsorb the screen piece 4 after being energized, and the reinforcing devices 3 are no longer adsorbed and connected to the screen piece 4 after being powered off. Of course, the reinforcing devices 3 can also be selected to include an adsorption head and an air pump. After the controller controls the air pump to be energized, suction is generated at the adsorption head, so that the reinforcing devices 3 are adsorbed to the screen piece 4. After the reinforcing devices 3 are powered off, the air pump stops working, the adsorption head is separated from the screen piece 4, and the reinforcing devices 3 are no longer adsorbed and connected to the screen piece 4, so that the controller can control whether the reinforcing devices 3 are adsorbed and connected to the screen piece 4 by powering on the reinforcing devices 3.

[0052] The number of the above-mentioned reinforcing devices 3 can be selected to be multiple, and multiple reinforcing devices 3 are arranged at any position between the first end and the second end of the curtain piece 4 after it is unfolded. Of course, multiple reinforcing devices 3 can be selected to be arranged in the middle area of ​​the height direction after the curtain piece 4 is unfolded, and the middle area can be selected to be between 1 / 3 and 2 / 3 of the height of the curtain piece 4 after it is unfolded. After the curtain piece 4 is unfolded, since the first end and the second end of the curtain piece 4 are respectively connected to the lifting bracket 2 and the base 1, the stability of the first end and the second end of the curtain piece 4 is good, but there is no structure that can be connected in the middle area of ​​the curtain piece 4, so that the middle area of ​​the curtain piece 4 is easily deformed and wrinkled due to wind blowing; multiple reinforcing devices 3 are arranged in the middle area to adsorb the curtain piece 4, which can significantly improve the stability of the middle area that is easily affected by wind when the curtain piece 4 is unfolded; of course, multiple reinforcing devices 3 can also be selected to be arranged at 1 / 2 of the height of the curtain piece 4, that is, multiple reinforcing devices 3 are all arranged at the middle position of the curtain piece 4, and multiple reinforcing devices 3 are adsorbed and connected to the middle position of the curtain piece 4 to improve the stability of the area that is easily deformed after the curtain piece 4 is unfolded.

[0053] Specifically, the above-mentioned lifting bracket 2 can be selected to have two telescopic brackets, the curtain piece 4 has two edge areas arranged opposite to each other along the width direction of the curtain piece 4 after it is unfolded, the two telescopic brackets are arranged at intervals along the width direction of the curtain piece 4, and the two telescopic brackets are respectively arranged corresponding to the two opposite edge areas of the curtain piece 4, so that after the multiple reinforcement devices 3 are respectively installed on the two telescopic brackets, the two edge areas of the curtain piece 4 can be adsorbed and connected with the reinforcement devices 3.

[0054] Of course, the lifting bracket 2 can also be selected as a telescopic bracket. When the telescopic bracket structure is in the unfolded position, the telescopic bracket structure extends to two edge areas of the curtain piece 4 at two opposite ends in the width direction of the curtain piece 4 in the middle area of ​​the above-mentioned curtain piece 4, and multiple reinforcement devices 3 are respectively installed at two ends of the telescopic bracket in the middle area of ​​the above-mentioned curtain piece 4 along the width direction of the curtain piece 4, so that the two edge areas of the curtain piece 4 are adsorbed and connected with the multiple reinforcement devices 3 on the lifting bracket 2.

[0055] It can be understood that the lifting bracket 2 can also be selected to include three telescopic brackets, and the three telescopic brackets are arranged at intervals along the width direction of the curtain piece 4, two telescopic brackets correspond to the two edge areas, and one telescopic bracket corresponds to the middle area between the two edge areas. When the telescopic bracket is in the unfolded position, the telescopic bracket is installed with a reinforcing device 3 in the middle area of ​​the above-mentioned curtain piece 4, so that the two edge areas of the curtain piece 4 and the middle area of ​​the curtain piece 4 can be connected to the lifting bracket 2 through the reinforcing device 3.

[0056] When the reinforcing device 3 is an electromagnet, the screen piece 4 is subjected to a process of increasing magnetic / ferrous properties so that the screen piece 4 can be magnetically connected to the reinforcing device 3, and the magnetic / ferrous properties are increased to the screen piece 4. The process is not limited, and the material with magnetic / ferrous properties can be added to the raw materials for making the screen piece 4 and mixed into one, or the material with magnetic / ferrous properties can be sprayed, printed, sputtered, doped, or pasted on the screen piece 4.

[0057] Of course, it is not limited to adding magnets / irons to the entire surface of the screen piece 4, or adding magnets / irons to a part of the screen piece 4, and coordinating with the support bracket position to achieve low-cost improvement of the flatness and wind resistance of the screen piece 4. Usually, the edge of the screen piece 4 is obviously curled, and it is necessary to increase the external force for adsorption and correction. You can choose to add more or stronger magnetic / iron performance materials to the edge area of ​​the screen piece 4 to adsorb with the lifting bracket 2.

[0058] The above-mentioned curtain piece 4 can be selected to have a rectangular or square structure. When the base 1 is placed on the ground, the vertical direction is the height direction of the curtain piece 4, the side of the curtain piece 4 close to the base 1 is the first end, and the end of the curtain piece 4 away from the base 1 is the second end. In the horizontal direction, the direction parallel to the surface of the curtain piece 4 is the width direction of the curtain piece 4. In the width direction of the curtain piece 4, the curtain piece 4 has a first edge area and a second edge area opposite to each other.

[0059] The above-mentioned controller can be selected as a microcomputer, and of course it can also be selected as a chip. The controller can be selected to have a power supply that can supply power to other components. Of course, the controller can also be electrically connected to the base 1, and the base 1 has a power supply. The controller can control whether the power supply on the base 1 supplies power to the components.

[0060] The reinforcing device 3 can be electrically connected to the base 1 through a power supply line, and the controller can be electrically connected to the base 1, so that the controller controls the base 1 to supply power to and cut off power to the reinforcing device 3, so that the lifting bracket 2 can be controlled to be adsorbed and connected to the screen piece 4 by whether power is supplied to the reinforcing device 3; of course, the reinforcing device 3 can be directly electrically connected to the controller through a power supply line, and the controller can directly control whether power is supplied to the reinforcing device 3. The reinforcing devices 3 can be two, or four, or five, as long as at least one reinforcing device 3 is provided at each of the two edge areas of the screen piece 4 on the lifting bracket 2, and the reinforcing device 3 can be provided in the middle of the screen piece 4, and the reinforcing device 3 can be provided in the middle area of ​​the screen piece 4, or can be provided at 1 / 2 of the height of the screen piece 4 after it is unfolded.

[0061] When the curtain piece 4 is unfolded, the first end and the second end are connected to the base 1 and the lifting bracket 2 respectively, so that the first end and the second end of the curtain piece 4 have a supporting structure and have a certain stability. When wind blows towards the curtain piece 4, the two opposite edge areas and the middle area of ​​the curtain piece 4 have poor stability and wind resistance due to the lack of a supporting structure. The reinforcing device 3 on the lifting bracket 2 is connected to the two edge areas of the curtain piece 4 to provide a supporting structure for the part of the curtain piece 4 with poor stability and wind resistance, so as to improve the overall stability of the curtain piece 4.

[0062] Furthermore, the first edge region and the second edge region are adsorbed and fixedly connected to the reinforcing device 3 in the middle of the unfolded curtain piece 4, so that the reinforcing device 3 has a good fixing effect on the two edge regions of the curtain piece 4 to improve the wind resistance of the curtain piece 4, and at the same time, the number of reinforcing devices 3 can be reduced, and the curtain piece 4 can be ensured to have good wind resistance by using fewer reinforcing devices 3.

[0063] When in use, the base 1 is placed on the ground or floor, and the controller controls the lifting bracket 2 to move the lifting bracket 2 upward and change from the retracted posture to the extended posture. The lifting bracket 2 drives the screen 4 to extend from the inside of the base 1 until the screen 4 is fully extended. At this time, the controller supplies power to the reinforcing device 3, and the multiple reinforcing devices 3 on the lifting bracket 2 are respectively connected with the adsorption of the screen 4, so that the two edge areas of the screen 4 after the extension are connected to the lifting bracket 2 through the reinforcing device 3 in the middle area of ​​the height direction of the screen 4 after the extension, so as to improve the stability and wind resistance of the screen 4. After the wind blows towards the screen 4, the deformation amplitude of the screen 4 is greatly reduced, thereby ensuring the display effect of the image on the screen 4; after the projection screen is used, the controller stops supplying power to the reinforcing device 3, and the screen 4 is disconnected from the reinforcing device 3 on the lifting bracket 2. The controller controls the lifting bracket 2 to descend, so that the lifting bracket 2 is changed from the extended posture to the retracted posture, and the screen 4 is retracted into the inside of the base 1 as the lifting bracket 2 descends.

[0064] The projection screen provided by the embodiment of the present disclosure is provided with a plurality of reinforcing devices 3 on the lifting bracket 2, and the reinforcing devices 3 are electrically connected to the controller. The controller is used to control the reinforcing devices 3 to be in an open state after the lifting bracket drives the screen piece 4 to unfold, so that the reinforcing devices 3 are connected and fixed to the screen piece 4; and to control the reinforcing devices 3 to be in a closed state before the lifting bracket drives the screen piece 4 to retract, so that the reinforcing devices 3 are no longer connected and fixed to the screen piece 4; in this way, the reinforcing devices 3 are connected and fixed to the screen piece 4 after the screen piece 4 is unfolded under the control of the controller, so that the screen piece 4 can be lifted and lowered by the reinforcing devices 3. The bracket 2 serves as a supporting structure to improve the stability and wind resistance of the screen 4, and prevent the screen 4 from curling due to wind and affecting the display effect of the image on the screen 4; and before the screen 4 is retracted, the reinforcing device 3 is controlled by the controller to be in a closed state, so that the reinforcing device 3 is no longer connected and fixed to the screen 4, thereby preventing the connection and fixation of the reinforcing device 3 and the screen 4 from interfering with the unfolding and retracting actions of the screen 4, thereby improving the windproof effect of the projection screen, and ensuring that the setting of the reinforcing device 3 does not affect the normal unfolding and retracting functions of the screen 4 of the projection screen, thereby improving the user experience of the projection screen.

[0065] Reference Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, in some embodiments, after the curtain piece 4 is unfolded, the first end of the curtain piece 4 along the height direction is subjected to the pulling force of the base 1, and the second end of the curtain piece 4 along the height direction is subjected to the pulling force of the lifting bracket 2, and the reinforcing device 3 is located in the area between the first end and the second end of the curtain piece 4 along the height direction.

[0066] Specifically, the first end and the second end of the unfolded curtain piece 4 are connected to the base 1 and the lifting bracket 2 respectively, so the part of the curtain piece 4 close to the first end has good stability under the pulling force of the lifting bracket 2, and the part of the curtain piece 4 close to the second end has good stability under the pulling force of the base 1, that is, the lifting bracket 2 and the base 1 can provide support and stability for the first end and the second end of the curtain piece 4, so that the first end and the second end of the curtain piece 4 have good wind resistance and stability; however, the part between the first end and the second end of the curtain piece 4, especially the curtain piece 4 near the position of 1 / 2 of the height of the curtain piece 4, is less subjected to the pulling force of the lifting bracket 2 and the base 1, resulting in poor stability and wind resistance, and the reinforcing device 3 is arranged in the area between the first end and the second end, so that the reinforcing device 3 adsorbs the curtain piece 4, thereby effectively improving the overall stability and wind resistance of the curtain piece 4.

[0067] By arranging the reinforcing device 3 in the area between the first end and the second end of the screen piece 4 in the height direction, the area of ​​the screen piece 4 where the tension of the base 1 and the lifting bracket 2 is smaller can be connected to the reinforcing device 3, so that the reinforcing device 3 can effectively improve the stability of the screen piece 4.

[0068] Reference Figures 1 to 9 As shown, in some embodiments, the curtain piece 4 has a first edge region and a second edge region that are arranged opposite to each other, and the first edge region and the second edge region both extend along the height direction of the curtain piece 4 after it is unfolded; at least one reinforcing device 3 is connected and fixed to the first edge region, and at least one reinforcing device 3 is connected and fixed to the second edge region.

[0069] Specifically, the first edge region and the second edge region may be arranged opposite to each other along the width direction of the unfolded curtain piece 4. The edge of the curtain piece 4 is more easily deformed by the wind. Therefore, at least one reinforcing device 3 is respectively arranged in the first edge region and the second edge region, so that the plurality of reinforcing devices 3 are respectively adsorbed on the first edge region and the second edge region, thereby effectively improving the wind resistance and stability of the curtain piece 4. One reinforcing device 3 may be arranged in each of the first edge region and the second edge region, and of course, two reinforcing devices 3 may also be arranged in each of the first edge region and the second edge region.

[0070] The middle area can be selected between the first edge area and the second edge area. The middle area can be selected to be located in the middle of the width direction of the screen piece 4, and the width of the middle area occupies 50% of the total width of the screen piece 4. The areas on both sides of the middle area are the first edge area and the second edge area. Of course, the middle area can also be selected to occupy 40% of the total width of the screen piece 4, and the two sides of the middle area are the first edge area and the second edge area. It should be noted that the first edge area and the second edge area both refer to a certain area range along the width direction of the screen piece 4 after the screen piece 4 is unfolded, and are not limited to the side edges of the screen piece 4. The middle area can be selected not to be provided with a reinforcing device 3, and of course, at least one reinforcing device 3 can be selected to be provided in the middle area. Multiple reinforcing devices 3 for adsorbing the screen piece 4 can be selected to be arranged at intervals along the width direction of the screen piece 4.

[0071] By arranging the curtain piece 4 to have a first edge area and a second edge area that are relatively arranged, at least one reinforcing device 3 is connected and fixed to the first edge area, and at least one reinforcing device 3 is connected and fixed to the second edge area, the first edge area and the second edge area with weaker wind absorption and stability can both improve stability through the adsorption connection of the reinforcing device 3, thereby using a smaller number of reinforcing devices 3 to improve the overall wind resistance effect of the curtain piece 4.

[0072] Reference Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7As shown, in some embodiments, after the curtain sheet 4 is unfolded, with the base 1 as the zero point height, the area between 1 / 3 height and 2 / 3 height of the curtain sheet 4 along the height direction is the reinforcement area, and the reinforcement device 3 is located in the reinforcement area.

[0073] Specifically, the first end and the second end of the unfolded curtain piece 4 are connected to the base 1 and the lifting bracket 2 respectively, so the part of the curtain piece 4 close to the first end and the second end has good wind resistance and stability under the action of tension. In the height direction after the curtain piece 4 is unfolded, the base 1 is taken as the starting point of the height, that is, the zero point. The area between 1 / 3 and 2 / 3 of the height of the curtain piece 4 is far away from the first end and the second end, and has no structure to be attached, so that the wind resistance and stability of the area between 1 / 3 and 2 / 3 of the height of the curtain piece 4 are poor. The area between 1 / 3 and 2 / 3 of the height of the curtain piece 4 is used as an adsorption area, so that the multiple reinforcement devices 3 can adsorb the adsorption area, thereby directly improving the stability and wind resistance of the adsorption area, which is conducive to improving the overall stability and wind resistance of the curtain piece 4.

[0074] By setting the area between 1 / 3 and 2 / 3 of the height of the curtain piece 4 along the height direction as the reinforcement area with the base 1 as the zero point height after the curtain piece 4 is unfolded, the reinforcement device 3 is located in the reinforcement area, and the reinforcement device 3 is connected to the reinforcement area to directly improve the stability and wind resistance of the reinforcement area, thereby enhancing the improvement effect of the stability and wind resistance of the curtain piece 4 after the reinforcement device 3 is adsorbed and connected to the curtain piece 4.

[0075] In a specific implementation, the reinforcing device 3 can be set in the middle area along the height direction after the screen piece 4 is unfolded, that is, at 1 / 2 of the height direction of the screen piece 4, or within a certain area centered on 1 / 2, to further ensure the windproof effect of the projection screen.

[0076] Reference Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, in some embodiments, a plurality of reinforcing devices 3 are arranged at intervals along the width direction of the unfolded curtain piece 4, and the plurality of reinforcing devices 3 are all located in the area between the first end and the second end of the curtain piece 4 along the height direction.

[0077] Specifically, the number of the reinforcing devices 3 can be two, and the two reinforcing devices 3 are arranged at intervals along the width direction of the unfolded curtain piece 4, and the two reinforcing devices 3 correspond to the two edge areas of the curtain piece 4 respectively. The reinforcing device 3 can be selected to be arranged in the area between the first end and the second end of the unfolded curtain piece 4. Of course, the reinforcing device 3 can also be selected to be arranged in the area between 1 / 3 and 2 / 3 of the height of the unfolded curtain piece 4, or it is not limited to the reinforcing device 3 being arranged in the area between 1 / 4 and 3 / 4 of the height of the unfolded curtain piece 4; multiple reinforcing devices 3 are arranged along the width direction of the curtain piece 4, so that multiple reinforcing devices 3 are connected to multiple positions of the curtain piece 4, so as to improve the wind resistance and stability of the curtain piece 4, which has a better effect.

[0078] Of course, the number of the reinforcing devices 3 can also be selected to be three, the three reinforcing devices 3 are arranged at intervals along the width direction of the curtain piece 4, two reinforcing devices 3 are respectively located in the two edge areas of the curtain piece 4, one reinforcing device 3 is located in the middle area between the two edge areas of the curtain piece 4, the three reinforcing devices 3 are arranged at intervals along the width direction of the curtain piece 4, and the three reinforcing devices 3 are all located between the first end and the second end of the curtain piece 4 after it is unfolded; or it is not limited to setting other numbers of reinforcing devices 3 at intervals along the width direction of the curtain piece 4 after it is unfolded, and multiple reinforcing devices 3 can be selected to be arranged at 1 / 2 of the height direction of the curtain piece 4, so that the multiple reinforcing devices 3 have a better stabilizing effect on the curtain piece 4.

[0079] By arranging the plurality of reinforcing devices 3 at intervals along the width direction of the unfolded curtain piece 4, and the plurality of reinforcing devices 3 are all located in the area between the first end and the second end of the curtain piece 4 along the height direction, the plurality of reinforcing devices 3 can adsorb and fix the curtain piece 4 along the width direction, thereby ensuring the stability of the curtain piece 4 in the width direction.

[0080] Reference Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, in some embodiments, the reinforcing device 3 includes an electromagnet, and at least a portion of the curtain sheet 4 corresponding to the electromagnet is provided with a magnetic attraction portion. After the curtain sheet 4 is unfolded, the electromagnet is magnetically fixed to the magnetic attraction portion at the corresponding portion.

[0081] Specifically, an electromagnet may be provided on the side of the lifting bracket 2 facing the screen 4, and the screen 4 may be magnetized or a metal sheet that can be magnetically connected to the electromagnet may be provided on the screen 4, so that the electromagnet can be magnetically connected to the screen 4 after being energized.

[0082] A metal sheet can be selected as a magnetic attraction portion on the side of the screen piece 4 facing the lifting bracket 2. Of course, a magnetic material can also be selected as a magnetic attraction portion on the side of the screen piece 4 facing the lifting bracket 2. The entire plane of the side of the screen piece 4 facing the lifting bracket 2 can be covered with a layer of magnetic material as the magnetic attraction portion. Of course, a disc-shaped magnetic material can also be selected as a magnetic attraction portion at a position where the screen piece 4 is opposite to the reinforcing device 3 in the direction of the screen piece 4 facing the lifting bracket 2, so that after the reinforcing device 3 is powered on, the magnetic attraction portion and the reinforcing device 3 are magnetically fixed to each other under the action of the magnetic force.

[0083] By setting the reinforcing device 3 to include an electromagnet, at least a portion of the screen piece 4 corresponding to the electromagnet is provided with a magnetic attraction portion, so that the controller controls whether to power the electromagnet to control whether the reinforcing device 3 is adsorbed and connected to the screen piece 4, and at least a portion of the screen piece 4 corresponding to the reinforcing device 3 is provided with a magnetic attraction portion, so that after the screen piece 4 is unfolded, the reinforcing device 3 is magnetically fixed to the magnetic attraction portion at the corresponding portion, and the magnetic attraction portion provides a structural basis for the connection between the reinforcing device 3 and the screen piece 4, and the magnetic attraction portion is provided in a partial area on the screen piece 4, which can reduce the cost of providing the magnetic attraction portion on the screen piece 4.

[0084] Reference Figures 1 to 9 As shown, in some embodiments, the curtain piece 4 has a first edge region and a second edge region that are arranged opposite to each other, and the first edge region and the second edge region both extend along the height direction of the curtain piece 4 after it is unfolded; the lifting bracket 2 includes a fixed end 21 and at least two sub-lifting frames 22, and the at least two sub-lifting frames 22 are arranged between the fixed end 21 and the base 1, the first end of the curtain piece 4 is movably connected to the base 1, and the second end of the curtain piece 4 is fixedly connected to the fixed end 21; at least two sub-lifting frames 22 are arranged at intervals along the width direction of the curtain piece 4, one of the sub-lifting frames 22 corresponds to the first edge region of the curtain piece 4 after it is unfolded, and at least one reinforcing device 3 is provided on the sub-lifting frame 22, and one of the sub-lifting frames 22 corresponds to the second edge region of the curtain piece 4 after it is unfolded, and at least one reinforcing device 3 is provided on the sub-lifting frame 22.

[0085] Specifically, the fixed end 21 can be selected as a cross bar arranged along the width direction of the curtain piece 4, and the sub-lifting frame 22 is respectively arranged at both ends of the fixed end 21, one end of the sub-lifting frame 22 is movably connected to the fixed end 21, and the other end is movably connected to the base 1, so that when the sub-lifting frame 22 is lifted or lowered relative to the base 1, it can drive the fixed end 21 to move up and down, and the second end of the curtain piece 4 is fixedly connected to the fixed end 21, so that when the sub-lifting frame 22 drives the fixed end 21 to move up and down, the fixed end 21 drives the second end of the curtain piece 4 to move in the vertical direction, thereby realizing the deployment and retraction of the curtain piece 4.

[0086] The above-mentioned sub-lifting frame 22 can selectively include multiple rods, and the multiple rods are crossed and movably connected to each other to form a scissor-type structure. One end of the scissor-type structure is movably connected to the base 1, and the other end is movably connected to the fixed end 21, so that the two mutually crossed lifting rods 221 at one end of the scissor-type structure can approach and move away from each other along the width direction of the curtain piece 4 on the base 1, and the two mutually crossed rods at the other end of the scissor-type structure can approach and move away from each other along the width direction of the curtain piece 4 on the fixed end 21, so that the scissor-type structure can be extended or shortened by changing the angle between the multiple rods between the fixed end 21 and the base 1, so that the sub-lifting frame 22 drives the fixed end 21 to move in the vertical direction.

[0087] Of course, the sub-lifting frame 22 can also be selected as telescopic rods that are nested with each other. The telescopic rods can move up and down in the vertical direction under the drive of a motor or a cylinder. The second end of the screen piece 4 is connected to the end of the telescopic rod away from the base 1, and the reinforcing device 3 is on the side of the telescopic rod to perform a magnetic attraction and fixation operation on the screen piece 4.

[0088] The number of the above-mentioned sub-lifting frames 22 can be selected to be two. In the direction of the curtain piece 4 toward the lifting bracket 2, one sub-lifting frame 22 corresponds to the first edge area, and the other sub-lifting frame 22 corresponds to the second edge area. Of course, the number of the sub-lifting frames 22 can also be selected to be three. The three sub-lifting frames 2 are arranged at intervals along the width direction of the curtain piece 4, two sub-lifting frames 22 correspond to the first edge area and the second edge area respectively, and one sub-lifting frame 22 corresponds to the middle area between the first edge area and the second edge area of ​​the curtain piece 4.

[0089] One reinforcing device 3 may be provided on each of the two sub-lifting frames 22. Of course, two reinforcing devices 3 may also be provided on each of the two sub-lifting frames 22. The two reinforcing devices 3 are provided at intervals along the width direction of the curtain piece 4 on the sub-lifting frames 22. For example, when the sub-lifting frames 22 are scissor-fork structures, the two reinforcing devices 3 are provided on two mutually intersecting lifting rods 221 of the scissor-fork structure, so that the two reinforcing devices 3 are provided at intervals along the width direction of the curtain piece 4.

[0090] When the screen piece 4 is fully unfolded, the sub-lifting frame 22 rises so that the installation position is in the reinforced area of ​​the screen piece 4, so that the reinforcing device 3 on the installation position can adsorb the reinforced areas of the screen piece 4 in the first edge area and the second edge area, so that the reinforcing device 3 can improve the overall stability of the first edge area.

[0091] The first edge region is adsorbed and connected to a sub-lifting frame 22 through a reinforcing device 3, and the second edge region is adsorbed and connected to another sub-lifting frame 22 through a reinforcing device 3, so that the reinforced region of the screen piece 4 in the first edge region is connected to the sub-lifting frame 22 to improve the stability of the first edge region, so that when the wind blows toward the first edge region, the first edge region will not curl and affect the image display effect, and the reinforced region of the screen piece 4 in the second edge region is connected to the sub-lifting frame 22 to improve the stability of the second edge region, so that when the wind blows toward the second edge region, the second edge region will not curl and affect the image display effect.

[0092] Each of the above-mentioned sub-lifting frames 22 can optionally include two lifting rods 221 that are cross-connected with each other. After the curtain piece 4 is unfolded, in the middle of the sub-lifting frame 22 in the height direction, the two lifting rods 221 are staggered along the width direction of the curtain piece 4 and form a mounting position respectively. A reinforcing device 3 is provided at the mounting position of each lifting rod 221; the lifting rod 221 includes two support rods, one end of one support rod is rotatably connected to one end of the other support rod, so that the two support rods can rotate relative to each other to change the angle between the two support rods, so that the two support rods are assembled into a lifting rod 221. After the two lifting rods 221 are crossed, the crossed positions of the two lifting rods 221 are rotatably connected with each other, so that the two lifting rods 221 form a scissor structure. By changing the angle between the two support rods of the lifting rod 221, the distance between the two ends of the scissor structure formed by the two lifting rods 221 is changed, and the curtain piece 4 is driven to unfold and retract by the two lifting rods 221.

[0093] After the above-mentioned curtain piece 4 is unfolded, at the middle position in the height direction of the sub-lifting frame 22, the two lifting rods 221 are spaced apart from each other along the width direction of the curtain piece 4, and a mounting position is formed on each of the two lifting rods 221, so that two reinforcing devices 3 can be installed on one sub-lifting frame 22, and the four reinforcing devices 3 on the two sub-lifting frames 22 are arranged at intervals along the width direction of the curtain piece 4, so that when the curtain piece 4 is connected to the two sub-lifting frames 22, the two reinforcing devices 3 on one sub-lifting frame 22 are connected to the first edge area, and the two reinforcing devices 3 on the other sub-lifting frame 22 are connected to the second edge area.

[0094] By setting the curtain piece 4 to have a first edge area and a second edge area that are relatively arranged, the lifting bracket 2 includes a fixed end 21 and at least two sub-lifting frames 22, so that the two sub-lifting frames 22 drive the fixed end 21 to move in the height direction of the curtain piece 4, so that the fixed end 21 drives the second end of the curtain piece 4 to move in the vertical direction, so as to realize the unfolding and retracting operations of the curtain piece 4, at least two sub-lifting frames 22 are arranged at intervals along the width direction of the curtain piece 4, at least two sub-lifting frames 22 correspond to the first edge area and the second edge area respectively, and at least one reinforcing device 3 is provided on the sub-lifting frames 22 to ensure that the first edge area and the second edge area can be connected to the two sub-lifting frames 22 respectively through the reinforcing device 3, and multiple sub-lifting frames 22 simultaneously apply driving force to the fixed end 21 during lifting, thereby improving the stability of the fixed end 21 during the vertical movement process, so that the unfolding and retracting operations of the curtain piece 4 are more stable and smooth.

[0095] Reference Figures 1 to 9 As shown, in some embodiments, there are two sub-lifting frames 22, which correspond to the first edge area and the second edge area of ​​the unfolded curtain piece 4, respectively, and at least one reinforcing device 3 is provided on each of the two sub-lifting frames;

[0096] An auxiliary bracket 23 is provided between the two sub-lifting frames 22 . The auxiliary bracket 23 is connected between the two sub-lifting frames 22 after the curtain piece 4 is unfolded. At least one reinforcing device 3 is provided on the auxiliary bracket 23 .

[0097] Specifically, after the curtain piece 4 is unfolded, the two sub-lifting frames 22 can be connected together through the auxiliary bracket 23, and the auxiliary bracket 23 can be located in the reinforcement area where the curtain piece 4 is unfolded; the sub-lifting frame 22 corresponding to the first edge area and the sub-lifting frame 22 corresponding to the second edge area can be selected to form at least one installation position in the adsorption area, and the auxiliary bracket 23 corresponding to the middle area can form a installation position in the adsorption area of ​​the curtain piece 4, and a reinforcement device 3 is provided at each installation position.

[0098] The screen piece 4 is divided into a first edge region, a middle region and a second edge region in sequence along the width direction of the screen piece 4. Two sub-lifting frames 22 are arranged at intervals along the width direction of the screen piece 4. The auxiliary bracket 23 is connected between the two sub-lifting frames 22, so that one of the sub-lifting frames 22, the auxiliary bracket 23 and the other sub-lifting frame 22 correspond to the first edge region, the middle region and the second edge region in sequence respectively.

[0099] When the sub-lifting frame 22 is a scissor structure formed by two intersecting lifting rods 221, the auxiliary bracket 23 may include two support rods, one end of one support rod is rotatably connected to one end of the other support rod, and the two ends of the auxiliary bracket 23 are respectively rotatably connected to the lifting rods 221 in the two sub-lifting frames 22, so that when the angle between the mutually intersecting lifting rods 221 of the sub-lifting frames 22 changes, the angle between the two support rods of the auxiliary bracket 23 also changes accordingly; the auxiliary bracket 23 is located between the two sub-lifting frames 22, so that the auxiliary bracket 23 is located in the middle area.

[0100] Of course, the auxiliary bracket 23 may also include a support rod, one end of which is rotatably connected to one of the sub-lifting frames 22, and the other end of which is detachably connected to the other sub-lifting frame 22. When the two sub-lifting frames 22 are unfolded, the auxiliary bracket 23 is connected between the two sub-lifting frames 22 by connecting the other end of the support rod to the other sub-lifting frame 22.

[0101] When the sub-lifting frame 22 is a telescopic rod driven by a motor or a cylinder, the auxiliary bracket 23 can be selected as a straight rod. The auxiliary bracket 23 is arranged along the width direction of the curtain piece 4. The two ends of the auxiliary bracket 23 are respectively connected to the two sub-lifting frames 22, so that when the curtain piece 4 is unfolded, the auxiliary bracket 23 is located in the middle of the height direction of the curtain piece 4.

[0102] It can be understood that the auxiliary bracket 23 can also be selected as a telescopic rod, which is arranged along the height direction of the curtain piece 4, one end of the telescopic rod is connected to the fixed end 21, and the other end is connected to the base 1. When the fixed end 21 is lifted and lowered under the drive of the sub-lifting frame 22, the telescopic rod is extended and retracted along the height direction of the curtain piece 4. When the curtain piece 4 is unfolded, the installation position of the auxiliary bracket 23 is in the middle of the height direction of the curtain piece 4; of course, three sub-lifting frames 22 can also be selected, and the three sub-lifting frames 22 are arranged at intervals along the width direction of the curtain piece 4, and the sub-lifting frame 22 located in the middle can be used as the auxiliary bracket 23.

[0103] One mounting position can be selectively set on each of the two sub-lifting frames 22 corresponding to the first edge region and the second edge region, so that three reinforcing devices 3 are respectively provided on the two sub-lifting frames 22 and the auxiliary bracket 23, and the three reinforcing devices 3 are all located in the reinforced region of the screen piece 4, and the three reinforcing devices 3 are arranged at intervals along the width direction of the screen piece 4, so that the three reinforcing devices 3 respectively adsorb the first edge region, the middle region, and the second edge region of the screen piece 4.

[0104] Of course, it is also possible to respectively provide two mounting positions on the two sub-lifting frames 22 corresponding to the first edge region and the second edge region, and provide one mounting position on the auxiliary bracket 23, so that the auxiliary bracket 23 and the two sub-lifting frames 22 are respectively provided with five reinforcing devices 3, the five reinforcing devices 3 are all located in the reinforced region of the curtain piece 4, and the five reinforcing devices 3 are arranged at intervals along the width direction of the curtain piece 4, so that the first edge region and the second edge region are respectively magnetically connected to the corresponding sub-lifting frames 22 through two reinforcing devices 3, and the middle region is connected to the corresponding sub-lifting frame 22 through one reinforcing device 3.

[0105] When five reinforcing devices 3 are provided on the auxiliary bracket 23 and the two sub-lifting frames 22, the two sub-lifting frames 22 corresponding to the first edge area and the second edge area are scissor structures formed by crossing two lifting rods 221, so that the two reinforcing devices 3 are respectively arranged on the two lifting rods 221 of the sub-lifting frames 22.

[0106] By setting the number of sub-lifting frames 22 to two, which correspond to the first edge area and the second edge area after the curtain piece 4 is unfolded, an auxiliary bracket 23 is arranged between the two sub-lifting frames 22, and the auxiliary bracket 23 corresponds to the middle area between the first edge area and the second edge area after the curtain piece 4 is unfolded; the first edge area, the second edge area and the middle area of ​​the curtain piece 4 are connected to the two sub-lifting frames 22 and the one auxiliary bracket 23 respectively, and the sub-lifting frames 22 corresponding to the first edge area and the sub-lifting frames 22 corresponding to the second edge area are respectively formed with at least one installation position in the middle part along the height direction, and the auxiliary bracket 23 corresponding to the middle area is formed with a installation position in the middle part along the height direction of the curtain piece 4, and each sub-lifting frame 22 is provided with a reinforcing device 3 at the installation position, so that the number of reinforcing devices 3 of the two sub-lifting frames 22 and the one auxiliary bracket 23 can be conveniently adjusted by adjusting the number of installation positions, so that the first edge area, the second edge area and the middle area of ​​the curtain piece 4 are connected to the two sub-lifting frames 22 and the one auxiliary bracket 23 through different numbers of reinforcing devices 3, so as to improve the wind resistance of the curtain piece 4.

[0107] Reference Figure 1 , Figure 7 , Figure 8 and Fig. 9 As shown, in some embodiments, a plurality of reinforcing members 41 are provided on the curtain piece 4, and the reinforcing members 41 are extended along the width direction of the curtain piece 4 after it is unfolded, and the plurality of reinforcing members 41 are sequentially arranged along the height direction of the curtain piece 4 after it is unfolded, and the reinforcing device 3 is connected and fixed to the reinforcing members 41 when it is started.

[0108] Specifically, the reinforcing member 41 can be selected to be a rectangular sheet or plate, and the length direction of the reinforcing member 41 is parallel to the horizontal direction, so that the reinforcing member 41 extends along the width direction of the screen piece 4, and the reinforcing member 41 can be selected to be attached to the side of the screen piece 4 facing the lifting bracket 2, and multiple reinforcing members 41 are arranged in sequence along the height direction of the screen piece 4 on the side of the screen piece 4 facing the lifting bracket 2, so that multiple reinforcing members 41 cover the side of the screen piece 4 facing the lifting bracket 2; when the reinforcing device 3 is an electromagnet, the reinforcing member 41 can be made of metal material or magnetic material. Of course, it is also possible to select that a sheet made of metal material or magnetic material is provided at the position corresponding to the reinforcing member 41 and the reinforcing device 3, and the sheet is magnetically connected to the electromagnet of the reinforcing device 3, so that the reinforcing member 41 is magnetically fixedly connected to the electromagnet of the reinforcing device 3.

[0109] By providing a plurality of reinforcement members 41 on the screen piece 4, the reinforcement members 41 provide a support structure for the screen piece 4 in the width direction of the screen piece 4. When wind blows toward the screen piece 4, the connection between the reinforcement members 41 and the screen piece 4 greatly reduces the curling of the screen piece 4. In addition, the reinforcement members 41 are fixed to the reinforcement device 3 by magnetic attraction, so that the lifting bracket 2 serves as a fixing structure of the reinforcement members 41, thereby improving the stability of the reinforcement members 41 and thus improving the wind resistance of the screen piece 4.

[0110] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in some embodiments, the controller is disposed on the base 1, the interior of the lifting bracket 2 has a wire passage, the wire passage is connected to the base 1, and the reinforcing device 3 is electrically connected to the controller through a wire located in the wire passage.

[0111] Specifically, the lifting bracket 2 can be selected as a hollow structure, and the lifting bracket 2 is connected to the base 1 so that the space inside the lifting bracket 2 is connected to the base 1. The space inside the lifting bracket 2 serves as a wire passage, and the guide for powering the reinforcing device 3 is electrically connected to the base 1 through the wire passage. Of course, the lifting bracket 2 can also be selected to provide a through groove between the installation position of the reinforcing device 3 and the base 1, and the through groove is located inside the lifting bracket 2, so that the channel is used as a wire passage, and the wire 31 of the reinforcing device 3 is electrically connected to the base 1 through the wire passage.

[0112] By providing a wire passage inside the lifting bracket 2, the wire 31 of the reinforcing device 3 passes through the wire passage and is electrically connected to the base 1, thereby preventing the wire 31 of the reinforcing device 3 from being easily damaged by the rising and falling of the lifting bracket 2 when it is outside the lifting bracket 2. In addition, the wire 31 inside the lifting bracket 2 also improves the aesthetics of the projection screen.

[0113] Reference Figures 1 to 10 As shown, in some embodiments, the lifting bracket 2 and the reinforcing device 3 are both electrically connected to a controller, and the controller is used to control the reinforcing device 3 to be powered on and magnetically fixed to the screen piece 4 after the lifting bracket 2 drives the screen piece 4 to unfold, and to control the reinforcing device 3 to be powered off and no longer magnetically fixed to the screen piece 4 before the lifting bracket 2 drives the screen piece 4 to retract.

[0114] Specifically, a controller can be provided on the base 1. The controller can be a chip, a microcomputer or a control circuit board. After the lifting bracket 2 is electrically connected to the controller, the controller can control the rise and fall of the lifting bracket 2 to control the deployment or retraction of the screen 4. When the lifting bracket 2 rises to fully deploy the screen 4, the controller controls the channel of the reinforcing device 3 to make the reinforcing device 3 magnetic and absorb the screen 4. The screen 4 is improved in stability and wind resistance through the reinforcing device 3 to ensure the display effect of the image on the screen 4.

[0115] When the projection screen is finished being used, the controller first controls the reinforcing device 3 to be powered off, so that the reinforcing device 3 loses its magnetism, and the screen piece 4 is separated from the reinforcing device 3, and then the lifting bracket 2 descends to retract the screen piece 4 into the base 1, thereby avoiding that the screen piece 4 remains connected to the reinforcing device 3 during the retraction process of the screen piece 4 and affects the retraction of the screen piece 4.

[0116] By setting a controller, the controller can control the rise and fall of the lifting bracket 2 to control the deployment or retraction of the screen 4, and the controller can realize that the reinforcing device 3 is energized and the screen 4 is magnetically adsorbed only when the screen 4 is fully deployed, thereby avoiding the reinforcement device 3 and the screen 4 being adsorbed during the deployment or retraction process to affect the deployment or retraction of the screen 4, thereby improving the automation degree of the projection screen and improving the user experience of the projection screen.

[0117] Reference Figure 1 As shown, in some embodiments, a wind sensor (not shown in the figure) is provided on the base 1 or the lifting bracket 2, and the wind sensor is used to detect the wind level in the environment where the projection screen is located. The wind sensor is electrically connected to the controller, and the controller is used to adjust the magnetic field strength of the reinforcement device 3 according to the wind level detected by the wind sensor.

[0118] Specifically, a wind sensor can be selected to be set on the base 1, and the wind sensor can be selected to be exposed on the base 1. The fan sensor is used to detect the wind force level of the environment where the projection screen is located. The wind force level is a method of expressing wind strength (wind force). The wind force level information detected by the wind sensor is transmitted to the controller, and the controller controls the magnetic field strength of the reinforcing device 3 by controlling the amount of power supplied to the reinforcing device 3. The greater the wind force level, the stronger the magnetic field strength, thereby ensuring that the projection screen can ensure the stability of the screen 4 when it is blown by strong winds. When the screen 4 is blown by weak winds, the current intensity required by the reinforcing device 3 can be reduced to achieve the effect of saving energy.

[0119] By providing a wind sensor on the base 1 or the lifting bracket 2, the controller is used to adjust the magnetic field strength of the reinforcing device 3 according to the wind level detected by the wind sensor, so that the magnetic field strength of the reinforcing device 3 is stronger when the projection screen is in an environment with strong winds, ensuring that the screen 4 is stable and does not curl, so as to ensure the display effect of the image on the screen 4. When the projection screen is in an environment with weak winds, the magnetic field strength of the reinforcing device 3 can be reduced, thereby reducing the energy consumed by the reinforcing device 3 to save energy. Finally, the projection screen can automatically adjust the strength of the connection between the reinforcing device 3 and the screen 4 according to the wind force of the environment, thereby achieving energy saving while ensuring the stability of the screen 4.

[0120] The projection screen provided by the embodiment of the present disclosure has a plurality of reinforcing devices 3 on its lifting bracket 2. The finite element simulation software is used to simulate the number of reinforcing devices 3 set on the lifting bracket 2. The medium wind of the common indoor air conditioner is selected as the simulated wind force. The simulated wind force is level 3 wind, the wind speed is about 4 meters per second, and the wind pressure is about 0.015 kPa. A 100-inch screen piece 4 is selected to simulate the deformation amount and deformation area of ​​the screen piece 4 under the action of level 3 wind. The results are referred to Figures 11 to 15 As shown, Fig.11 The areas on both sides of the middle screen piece 4 correspond to the deformation value at the top of the upper right corner, and the areas in the middle of the screen piece 4 toward the edge correspond to the remaining deformation values ​​of the upper right corner from top to bottom. Figures 12 to 15 The middle portion of the middle screen piece 4 toward the edge of the screen piece 4 corresponds to the deformation values ​​of the upper right corner from top to bottom in sequence.

[0121] Fig.11 As shown, when the reinforcing device 3 is not provided, the screen piece 4 is blown by a level 3 wind, and the maximum deformation area of ​​the screen piece 4 is at the left and right edges of the screen piece 4, which will cause the screen piece 4 to be uneven and the projected image of the screen piece 4 to be deformed. At this time, the deformation amount of the screen piece 4 is the basic deformation amount, and the deformation area of ​​the screen piece 4 is the basic deformation area.

[0122] Fig.12As shown, a reinforcing device 3 is respectively provided at the first edge area and the second edge area on the left and right sides of the screen piece 4 for adsorption and fixation. That is, when two reinforcing devices 3 are used to magnetically fix the screen piece 4, the maximum deformation area of ​​the screen piece 4 is in the middle. At this time, the deformation amount is reduced by about half compared with the basic deformation amount, and the influence on the projection picture is reduced.

[0123] Fig.13 As shown, two reinforcing devices 3 are respectively arranged at the first edge area and the second edge area on the left and right sides of the screen piece 4 for adsorption and fixation. That is, when four reinforcing devices 3 are used to magnetically fix the screen piece 4, the maximum deformation area of ​​the screen piece 4 is reduced. At this time, the maximum deformation amount is only 1 / 4 of the basic deformation amount, and the influence on the projection picture is further reduced.

[0124] Fig.14 As shown, two reinforcing devices 3 are respectively arranged at the first edge area and the second edge area on the left and right sides of the screen piece 4 for adsorption and fixation, and one reinforcing device 3 is arranged at the middle area of ​​the screen piece 4 for magnetic adsorption and fixation, that is, when the screen piece 4 is adsorbed by five reinforcing devices 3, the maximum deformation area of ​​the screen piece 4 moves downward, and the maximum deformation at this time is only 1 / 10 of the basic deformation, which greatly reduces the impact on the projection picture.

[0125] Fig.15 As shown, a reinforcing member 41 is provided on the screen piece 4, and a reinforcing device 3 is provided in the first edge region and the second edge region respectively to be magnetically adsorbed and fixed to the reinforcing member 41, that is, two reinforcing devices 3 are used to adsorb and fix the screen piece 4 provided with the reinforcing member 41. At this time, the maximum deformation amount is only 1 / 4 of the basic deformation amount, and the maximum deformation area is also only 1 / 4 of the basic deformation area.

[0126] Since the energy consumption of setting five reinforcing devices 3 is high, after comprehensively comparing the setting schemes of the reinforcing devices 3, a reinforcing member 41 is set on the screen piece 4, and a reinforcing device 3 and a reinforcing member 41 are respectively set in the first edge area and the second edge area for magnetic adsorption and fixation. This is the best solution that takes into account both economy and energy consumption, which can significantly reduce the deformation of the screen piece 4 and reduce energy consumption by setting fewer reinforcing devices 3.

[0127] During specific use, the base 1 is placed on the ground or the floor, the electromagnet of the reinforcing device 3 is in an unpowered state and has no magnetism, the controller controls the multiple sub-lifting frames 22 of the lifting bracket 2 to move upward at the same time to drive the screen piece 4 to extend out of the base 1 and unfold, after the screen piece 4 is fully unfolded, the controller controls the reinforcing device 3 to be energized, so that the reinforcing device 3 on the sub-lifting bracket 2 is magnetically fixed to the reinforcing member 41 on the screen piece 4, the controller adjusts the magnetic field strength of the reinforcing device 3 according to the wind force level detected by the wind force sensor, thereby controlling the connection strength between the reinforcing device 3 and the screen piece 4, after the projection screen is used up, the controller first controls the reinforcing device 3 to be powered off, so that the magnetic field on the reinforcing device 3 disappears, the screen piece 4 is separated from the reinforcing device 3, and then the controller controls the multiple sub-lifting frames 22 of the lifting bracket 2 to move downward to drive the screen piece 4 to be retracted into the base 1.

[0128] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0129] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A projection screen, characterized in that: include: Pedestal; a lifting bracket, mounted on the base, configured to be switchably lifted and lowered between a retracted posture and an extended posture relative to the base, and the lifting bracket is provided with a plurality of reinforcing devices; The curtain piece has a first end and a second end which are arranged opposite to each other, the first end of the curtain piece is movably connected to the base, the second end of the curtain piece is fixedly connected to the lifting bracket, the curtain piece is configured to be unfolded or retracted under the drive of the lifting bracket, and the reinforcing device is used to be connected and fixed to the curtain piece in the opened state; A controller is electrically connected to the reinforcing device, and is used to control the reinforcing device to be in an open state after the lifting bracket drives the curtain piece to be unfolded, and to control the reinforcing device to be in a closed state before the lifting bracket drives the curtain piece to be retracted.

2. The projection screen according to claim 1, characterized in that: After the curtain piece is unfolded, the first end of the curtain piece in the height direction is subjected to the pulling force of the base, and the second end of the curtain piece in the height direction is subjected to the pulling force of the lifting bracket, and the reinforcing device is located in the area between the first end and the second end of the curtain piece in the height direction.

3. The projection screen according to claim 2, characterized in that: The curtain piece has a first edge region and a second edge region which are arranged opposite to each other, and the first edge region and the second edge region both extend along the height direction of the curtain piece after it is unfolded; At least one of the reinforcing devices is connected and fixed to the first edge region, and at least one of the reinforcing devices is connected and fixed to the second edge region.

4. The projection screen according to claim 2, characterized in that: After the curtain piece is unfolded, with the base as the zero point height, the area between 1 / 3 height and 2 / 3 height of the curtain piece along the height direction is the reinforcement area, and the reinforcement device is located in the reinforcement area.

5. The projection screen according to claim 2, characterized in that: The plurality of reinforcing devices are arranged at intervals along the width direction of the unfolded curtain piece, and the plurality of reinforcing devices are all located in the area between the first end and the second end of the curtain piece along the height direction.

6. The projection screen according to any one of claims 1 to 5, characterized in that: The reinforcing device comprises an electromagnet, and at least a portion of the curtain piece corresponding to the electromagnet is provided with a magnetic attraction portion. After the curtain piece is unfolded, the electromagnet is magnetically fixed to the magnetic attraction portion at the corresponding portion.

7. The projection screen according to any one of claims 1 to 5, characterized in that: The curtain piece has a first edge region and a second edge region which are arranged opposite to each other, and the first edge region and the second edge region both extend along the height direction of the curtain piece after it is unfolded; The lifting bracket includes a fixed end and at least two sub-lifting brackets, wherein the at least two sub-lifting brackets are arranged between the fixed end and the base, the first end of the curtain piece is movably connected to the base, and the second end of the curtain piece is fixedly connected to the fixed end; The at least two sub-lifting frames are arranged at intervals along the width direction of the curtain piece, one of the sub-lifting frames corresponds to the first edge area of ​​the curtain piece after it is unfolded, and at least one of the sub-lifting frames is provided with the reinforcing device, and one of the sub-lifting frames corresponds to the second edge area of ​​the curtain piece after it is unfolded, and at least one of the sub-lifting frames is provided with the reinforcing device.

8. The projection screen according to claim 7, characterized in that: There are two sub-lifting frames, which respectively correspond to the first edge area and the second edge area after the curtain piece is unfolded, and at least one reinforcing device is disposed on each of the two sub-lifting frames; An auxiliary bracket is provided between the two sub-lifting frames. The auxiliary bracket is connected between the two sub-lifting frames after the curtain piece is unfolded. At least one reinforcing device is provided on the auxiliary bracket.

9. The projection screen according to any one of claims 1 to 5, characterized in that: The curtain piece is provided with a plurality of reinforcing members, the reinforcing members are extended along the width direction of the unfolded curtain piece, the plurality of reinforcing members are sequentially arranged along the height direction of the unfolded curtain piece, and the reinforcing device is connected and fixed to the reinforcing members when activated.

10. The projection screen according to any one of claims 1 to 5, characterized in that: A wind sensor is provided on the base or the lifting bracket, and the wind sensor is used to detect the wind level of the environment in which the projection screen is located. The wind sensor is electrically connected to the controller, and the controller is used to adjust the connection strength between the reinforcing device and the screen piece according to the wind level detected by the wind sensor.

Images