A liftable screen

Abstract

The application discloses a liftable screen, which comprises a shell, a screen body, and a lifting part. The shell is formed with a containing space. The lifting part is arranged in the containing space and comprises a belt wheel, a belt spring and a fixing piece. The belt spring is used for supporting the screen body, one end of the belt spring is connected with the screen body, the other end of the belt spring is fixed on the belt wheel, the belt wheel is used for winding / unwinding the belt spring, and the fixing piece is arranged on one side of the belt spring and used for fixing the belt spring to prevent the belt spring from retracting. In this way, the screen has simple overall structure, relatively thin thickness and relatively light weight.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic equipment, in particular to a liftable screen. BACKGROUND

[0002] Laser television is a super short focus projection device using laser light source and projection display technology, which can easily realize the large size display effect that traditional liquid crystal television cannot realize, and has high cost performance. Laser television usually needs to be matched with a laser television screen to achieve the best display effect. On the one hand, the wall surface of an ordinary family is an approximately diffuse reflection surface, so that most of the light emitted by the laser television cannot be viewed by the viewer, and the projection effect is greatly reduced. On the other hand, ambient light will reduce the contrast of the projection picture, so the laser television screen needs certain light resistance to ensure good display contrast. Therefore, the laser television screen is of great significance to ensure the display effect of the laser television.

[0003] The present application relates to the technical field of electronic equipment, in particular to a liftable screen. SUMMARY

[0004] The technical problem solved by the present application is to provide a liftable screen that can simplify the screen structure and make the screen overall lighter and thinner.

[0005] To solve the above technical problems, one technical solution adopted by the present application is to provide a liftable screen, which comprises: a shell forming a containing space; a screen body; a lifting part arranged in the containing space, the lifting part comprising a pulley, a spring and a fixing part, the spring being used to support the screen body, one end of the spring being connected to the screen body, the other end of the spring being fixed to the pulley, the pulley being used to wind / unwind the spring; and the fixing part being located on one side of the spring and being used to fix the spring to prevent the spring from retracting.

[0006] The lifting part further comprises a connecting piece, and one end of the spring is connected to the screen body through the connecting piece.

[0007] The fixing part comprises a friction wheel, the friction wheel being arranged between the pulley and the connecting piece, and the friction wheel being used to push the spring to expand in a predetermined direction.

[0008] The screen further comprises a guide groove arranged on one side of the pulley, part of the spring being arranged in the guide groove, the guide groove being arc-shaped, and the curvature of the guide groove gradually decreasing in the direction in which the spring is wound.

[0009] The lifting part further comprises a flexible sleeve, one end of the flexible sleeve is fixed to the connecting piece, and the flexible sleeve is used to expand together with the belt spring and wrap the belt spring on the outside.

[0010] The lifting part further comprises a first spiral spring, the first spiral spring is connected to the belt wheel and used to provide a winding torque for the belt wheel during winding.

[0011] The lifting part further comprises a second spiral spring, the second spiral spring is used to provide a retracting force for the belt spring during winding, one end of the second spiral spring is connected to the belt spring, and the other end of the second spiral spring is connected to the belt wheel.

[0012] The screen further comprises a winding shaft and a third spiral spring, the winding shaft is used to wind / unwind the screen body, and the third spiral spring is connected to the winding shaft to make the screen body contract on the winding shaft during winding.

[0013] The belt wheel comprises a first belt wheel and a second belt wheel, the belt spring comprises a first belt spring and a second belt spring, the first belt wheel is used to wind / unwind the first belt spring, the second belt wheel is used to wind / unwind the second belt spring, and the concave surface of the first belt spring is arranged opposite to the concave surface of the second belt spring after the first belt spring and the second belt spring are expanded.

[0014] The fixing piece comprises an inner pin, the inner pin is arranged between the first belt wheel and the second belt wheel, and the adjusting inner pin can fix the belt spring.

[0015] The lifting part comprises a first lifting part and a second lifting part, the first lifting part is arranged along a first direction, and the second lifting part is arranged along a second direction, wherein the first direction is perpendicular to the second direction.

[0016] The screen body is provided with a suction member at a position where the screen body contacts the belt spring, and the suction member is used to make the screen body adhere to the belt spring.

[0017] The beneficial effect of the embodiment of the application is that, different from the prior art, the liftable screen comprises a shell, a screen body and a lifting part. The lifting part comprises a belt spring, a belt wheel and a fixing piece, one end of the belt spring is connected to the screen body, the belt spring has a large reverse bending moment bearing capacity due to the arc cross section of the belt spring when the belt spring is expanded, the screen body can be supported by using the bearing capacity of the belt spring when the screen body is expanded, and the winding and unwinding states of the screen body can be converted by using the elastic deformation characteristics of the belt spring. The liftable screen of the embodiment has a simple structure, a relatively thin thickness and a relatively light weight. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic view of an embodiment of the liftable screen of the application;

[0019] Figure 2 is Figure 1A cross-sectional view of the lifting part;

[0020] Figure 3 A Figure 1 A structural diagram of the screen with the lifting part and the elastic buckle;

[0021] Figure 4 A Figure 2 A structural diagram of an embodiment of the elastic buckle;

[0022] Figure 5 A Figure 4 A load capacity diagram of an embodiment of the elastic buckle;

[0023] Figure 6 A Figure 1 A structural diagram of a cross section of an embodiment of the lifting part;

[0024] Figure 7 A Figure 2 An enlarged view of the circle C;

[0025] Figure 8 A top view of an embodiment of the distribution of the lifting part of the screen according to the present application;

[0026] Figure 9 A top view of another embodiment of the distribution of the lifting part of the screen according to the present application;

[0027] Figure 10 A top view of still another embodiment of the distribution of the lifting part of the screen according to the present application;

[0028] Figure 11 A structural diagram of an embodiment of the elastic buckle of the screen according to the present application. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0030] At present, the laser television products on the market mainly have fixed screens. The screens that can be lifted need to be manually unfolded or rolled up, which is not convenient enough, or need a relatively thick supporting structure, which is not beautiful enough from the side or the back. The present application provides a screen that can be lifted, which is not only simple in structure, relatively thin, but also strong in load capacity.

[0031] Please refer to Figure 1 , Figure 1is a structural schematic diagram of an embodiment of the application. The embodiment of the application includes a shell 3, a screen body 1 and a lifting part 2. The shell 3 is formed with a receiving space, and the shell 3 is used to support and protect the overall structure of the screen body 1 and the lifting part 2.

[0032] Specifically, the screen body 1 is a screen main body with a display function. In order to realize the winding of the screen body 1, the screen body 1 can be a flexible structure. The screen body 1 can use a polyethylene terephthalate (PET), polyurethane (PU) or other film material as a base material, and a microstructure, a paint film or other treatment is made on the surface thereof.

[0033] Further, the screen also includes a winding shaft (not shown), which can be fixed in the receiving space and can rotate around the central axis to wind or unwind the screen body 1. After winding, the screen body 1 can be located in the receiving space formed by the shell 3 to protect the screen body 1 from water and dust.

[0034] Preferably, the screen can also include a third coil spring (not shown) connected to the winding shaft. When winding the screen body 1, the winding shaft can further rotate in the winding direction by using the elastic force of the third coil spring, thereby tightening the screen body 1 on the winding shaft.

[0035] The lifting part 2 is arranged in the receiving space and is used to realize the unwinding and winding of the screen body 1. As shown in Figure 2 , Figure 2 is Figure 1 a cross-sectional view of the lifting part, the lifting part 2 includes a belt wheel 23, a belt spring 21 and a fixing part.

[0036] The belt spring 21 is used to support the screen body 1, one end of the belt spring 21 is connected to the screen body 1. The other end of the belt spring 21 is fixed to the belt wheel 23, and the belt wheel 23 is used to wind / unwind the belt spring 21. The fixing part is located on one side of the belt spring 21, and is used to fix the belt spring 21 after unwinding to prevent the belt spring 21 from retracting and winding on the belt wheel 23.

[0037] Optionally, the lifting part 2 can also include a connecting part 22, one end of the belt spring 21 is connected to the screen body 1 through the connecting part 22. The crossbeam on one side of the screen body 1 can be connected to the connecting part 22, wherein the connection between the screen body 1 and the connecting part 22 can be threaded connection, riveting or adhesion, so as to ensure that the screen body 1 can be lifted with the lifting part 2.

[0038] Optionally, the lifting part 2 can further comprise a housing 20, the belt wheel 21, the belt spring 23 and the fixing member can be arranged in the housing 20, so as to enhance the protection of the internal components of the lifting part 2.

[0039] As shown in Figure 3 , the belt spring 21 is used to support the screen body 1 after being unfolded. As shown in Figure 4 , the belt spring 21 is a long strip with circular arc shape. In this embodiment, the basic principle that the belt spring 21 can be used as a structure is that the Gaussian curvature of the elastic structure remains unchanged in the range without yielding (under the condition without yielding). According to the Gauss Theorem, the Gaussian curvature is the product of the principal curvatures of the surface, the principal curvatures are the maximum and minimum values of the curvature at a point on the surface, and the two are orthogonal. When the material is processed into the structure of the belt spring 21, the Gaussian curvature is 0, and after bending, the curvature in the cross-sectional direction (one of the principal curvatures) is not zero, and in the length direction, in order to keep the Gaussian curvature unchanged (=0), the curvature must be 0 (i.e. keep straight), thereby keeping high stiffness in the length direction. This principle has been applied to some structures in the field of architecture, such as arches, corrugated boards, etc. According to the above principle, a material with a large elastic range can be selected to make the belt spring 21, and a high-quality carbon structural steel is preferably selected, which can be processed into the required shape through a heat treatment process. In other embodiments, carbon fibers or the like can also be used as required.

[0040] The deformation of the belt spring 21 in the unfolded state mainly includes bending and torsion. In this embodiment, the ability of the belt spring 21 to bear bending load is mainly utilized. According to the structure of the belt spring 21, the bending direction can be divided into positive and negative directions, and the torque required to make the belt spring 21 bend in the positive direction is usually much smaller than the torque required to make it bend in the negative direction, i.e. the belt spring 21 has an asymmetric characteristic in the ability to bear bending moment. Taking the material of the belt spring 21 as an example, when the length is 200 mm, the thickness is 0.1 mm, the cross-sectional circular radius is 13.3 mm, and the central angle is 106°, as shown in Figure 5 , the bearing capacity is obviously asymmetric, and after exceeding the critical bending moment, the bending moment required for the deformation of the belt spring 21 rapidly decreases to a low level. Therefore, in order to facilitate the unfolding and winding of the belt spring 21, the liftable screen of this embodiment can further comprise a guide groove 26, the guide groove 26 is arranged on one side of the belt wheel 23 and along the direction in which the belt spring 21 is unfolded, and part of the belt spring 21 is arranged in the guide groove 26. When winding, the cross-sectional shape of the belt spring 21 is changed through the guide groove 26 and cooperates with the winding torque, so as to realize the winding of the belt spring 21. Since the entire deformation process of the belt spring 21 is within the elastic deformation range, the mechanical properties of the spring will not be affected.

[0041] Specifically, the guide groove 26 can be designed according to the cross-sectional shape of the belt spring 21 to ensure the cross-sectional consistency of the belt spring 21 in the unwound state. Preferably, the guide groove 26 is arc-shaped, and the curvature of the guide groove 26 gradually decreases in the direction in which the belt spring 21 is wound. That is, the outermost end of the guide groove 26 is circular arc-shaped, which ensures that the cross section of the unwound spring gradually transitions to an arc with a smaller curvature or a straight line, so that the belt spring 21 has a smaller deformation resistance near the belt pulley 23, facilitating winding.

[0042] When the belt spring 21 is unwound, the belt pulley 23 can be driven to rotate by the driving mechanism, gradually pushing the belt spring 21 to unwind along the guide groove 26, and finally ascending in the vertical direction. After the belt spring 21 is completely unwound, the belt spring 21 can be fixed by the fixing member to prevent the belt spring 21 from retracting. When winding, the fixing member 21 releases the fixation of the belt spring 21, and the reverse rotation of the driving mechanism can make the belt spring 21 wind on the belt pulley 23.

[0043] In a specific embodiment, the lifting part further comprises a first spiral spring (not shown), the first spiral spring is connected to the belt pulley 23, and the first spiral spring can provide a winding torque for the belt pulley 23 during winding by using the elastic force of the first spiral spring. In other embodiments, the lifting part 2 further comprises a second spiral spring (not shown), one end of the second spiral spring is connected to the belt spring 21, and the other end of the second spiral spring is connected to the belt pulley 23. The second spiral spring is used to make the belt spring 21 have a retraction force when winding, so that the winding of the belt spring 21 is more convenient.

[0044] The structural parameters that have a greater impact on the mechanical properties of the belt spring 21 mainly include thickness, unwinding angle, curvature radius (or width), etc. Increasing the thickness and unwinding angle can improve the carrying capacity of the structure, but cannot change the asymmetric characteristics of the carrying capacity, i.e., the single belt spring 21 carrying structure may have instability problems. Therefore, in a preferred embodiment, an axially symmetric distributed belt spring 21 structure can be used, and one side of the belt spring 21 is used as the main carrying structure when bending, thereby solving the problem of asymmetric bending moment capacity of the belt spring 21. In addition, the symmetrically distributed belt spring 21 also has a certain resistance to torsional deformation.

[0045] Specifically, the belt pulley 23 comprises a first belt pulley 231 and a second belt pulley 232, and the belt spring 21 comprises a first belt spring 211 and a second belt spring 212. The first belt pulley 231 is used to wind / unwind the first belt spring 211, and the second belt pulley 232 is used to wind / unwind the second belt spring 212. The concave surface of the first belt spring 211 is arranged opposite to the concave surface of the second belt spring 212 after the first belt spring 211 and the second belt spring 212 are unwound.

[0046] One end of the first belt spring 211 and the second belt spring 212 is always fixed together and kept in an unfolded state, and this end can be connected and fixed to the structure that needs to bear the load. In this embodiment, synchronous gears are fixed on the first pulley 231 and the second pulley 232 to achieve symmetrical rotation of the first pulley 231 and the second pulley 232. When the belt spring 21 is unfolded, the first drive mechanism can drive the first pulley 231 and the second pulley 232 to rotate symmetrically, gradually pushing the first belt spring 211 and the second belt spring 212 to unfold or move forward along the guide groove 26, and finally rise in the vertical direction. In other embodiments, different drive mechanisms can also drive the first pulley 231 and the second pulley 232 to rotate symmetrically, as long as the rotational linear speed of the first pulley 231 and the second pulley 232 is the same.

[0047] After the spring 21 is fully extended, it can be clamped by the fixing member to prevent the spring 21 from retracting. In a specific embodiment, the fixing member can be an inner pin 25, which can be disposed inside the outer casing 20. In this embodiment, the cross-sectional view of the lifting part 2 along the direction perpendicular to the extension of the spring 21 is shown below. Figure 6 As shown, the inner pin 25 is partially housed in the guide groove 26 and positioned between the first belt spring 211 and the second belt spring 212. The belt spring 21 can be fixed by adjusting the inner pin 25 to prevent it from retracting and wrapping around the pulley 21. Specifically, as follows... Figure 7 As shown, the inner pin 25 has a threaded hole at its bottom, through which a lead screw 252 passes. The lead screw 252 can be connected to an external drive gear 253, which is driven by a power mechanism. During unfolding, the power mechanism drives the lead screw 252 to rotate via the drive gear 253. The lead screw 252 can rotate but does not produce axial displacement. The inner pin 25 can move linearly due to the bottom thread 251, and it does not rotate under the limiting action of the outer shell 20 and the spring 21. By rationally designing the transmission ratio, the inner pin 25 rises to a position where it can lock the pulley 23 by friction after the screen body 1 is fully unfolded, clamping the spring 21. During rewinding, the lead screw 252 rotates in the opposite direction, thereby releasing the lock on the pulley 23 and allowing the spring 21 to retract.

[0048] In other embodiments, the screen further comprises a friction wheel 24 disposed between the belt wheel 23 and the connecting member 22. The friction wheel 24 can be used to push the belt spring 21 to expand in a predetermined direction. The belt spring 21 can be pushed forward by the second driving mechanism to drive the friction wheel 24 to achieve a constant speed of expansion. The friction wheel 24 can also serve to assist in fixing the belt spring 21. For example, the friction wheel 24 is fixed to one end of the belt spring, and the other end of the belt spring can be fixed to the housing 3 or the shell 20. The direction of the belt spring is set so that it releases the elastic potential energy when the belt spring 21 expands and gradually tightens to store the elastic potential energy when it is wound up. In this way, the belt spring 21 has resistance when it is wound up, which is equivalent to increasing the reverse rotation damping of the friction wheel 24.

[0049] Optionally, the lifting part 2 further comprises a flexible sleeve (not shown), one end of which is fixed to the connecting member 22, and the other end of which can be fixed to the shell 20. When the belt spring 21 is wound up, the flexible sleeve can be stacked between the connecting member 22 and the shell 20. After expansion, the flexible sleeve expands with the belt spring 21 and wraps around the outside of the belt spring 21, which can prevent the belt spring 21 from twisting. When the belt spring 21 comprises a first belt spring 211 and a second belt spring 212, the flexible sleeve can ensure that the symmetrically distributed first belt spring 211 and second belt spring 212 are attached together, avoiding separation and twisting, etc.

[0050] According to the size of the belt spring 21 adopted and the size, weight and design load of the screen body 1, the number and arrangement of the lifting parts 2 can be flexibly adjusted. The number of lifting parts 2 can be set to 2, 3, 4, 5, etc. according to actual conditions. In one specific embodiment, as shown in Figure 8 , the number of lifting parts 2 is 2, which are respectively fixed to the two ends of the screen body 1 to realize the lifting and support of the screen body 1. In another specific embodiment, Figure 9 , the number of lifting parts 2 can be 4, which are set at equal intervals in the middle on the basis of the previous embodiment to be able to bear the weight of the screen body 1 as a whole.

[0051] In yet another embodiment, considering that the actual load of the lifting part 2 can come from different directions, and in order to ensure the tension of the side edges of the screen body 1, as shown in Figure 10 , the lifting part 2 comprises a first lifting part 201 and a second lifting part 202, the first lifting part 201 is arranged along a first direction A, and the second lifting part 202 is arranged along a second direction B, wherein the first direction A is perpendicular to the second direction B. By arranging the first lifting part 201 and the second lifting part 202 in different directions, the resistance to lateral load can be provided.

[0052] In order to realize the resistance to lateral load, the screen body 1 needs to be coupled with the lateral deformation of the spring belt 21 in the embodiment. In a specific embodiment, the screen body 1 and the spring belt 21 are in contact with each other, and an absorbing accessory such as a soft magnetic sticker, a magic sticker or the like is arranged at the contact position to ensure the adhesion of the screen body 1 and the spring belt 21. In other alternative embodiments, as shown in Figure 11 the screen body 1 and the spring belt 21 are in contact with each other, and a plurality of elastic buckles 12 are arranged at the contact position. The elastic buckles 12 are fixed to the back of the screen body 1 and have a certain elasticity. When the screen body 1 is unfolded, the elastic buckles 12 can just clamp the two sides of the spring belt 21, and the lateral bearing capacity of the spring belt 21 provides a lateral tension to the screen body 1. Further, the liftable screen further comprises an adjusting member (not shown) which can be fixed to the shell 3. The adjusting member is used to enable the spring belt 21 to be clamped in the elastic buckle 12 when the screen body 1 is unfolded, and to enable the spring belt 21 to be released from the elastic buckle 12 when the screen body 1 is rolled up. In the embodiment, the elastic buckle 12 is rolled up together with the screen body 1.

[0053] Compared with the prior art, the embodiment of the present application supports the screen body 1 by the bearing capacity of the spring belt 21, and uses the elastic deformation of the spring belt 21 to complete the conversion between the rolled-up and unfolded states of the screen body 1. In this way, the liftable screen of the present application has a simple structure, a relatively thin thickness and a relatively light weight.

[0054] The above description is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation based on the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A height-adjustable screen, characterized in that, The screen includes: A housing having an accommodating space; Screen itself; A lifting unit, disposed within the accommodating space, includes a pulley, a spring, and a fixing member. The spring supports the screen body, with one end connected to the screen body; the other end is fixed to the pulley, which is used to wind / unwind the spring. The fixing member is located on one side of the spring and is used to secure the spring to prevent it from retracting. The pulleys include a first pulley and a second pulley. The fixing component includes an inner pin, which is disposed between the first pulley and the second pulley. Adjusting the inner pin can fix the belt spring. The bottom of the inner pin has a threaded hole, and a lead screw passes through the threaded hole. The lead screw is connected to a drive gear, which drives the lead screw to rotate, thereby driving the inner pin to move linearly to lock or release the belt spring. The lifting part also includes a second spiral spring, which is used to give the belt spring a retraction force when it is wound up. One end of the second spiral spring is connected to the belt spring, and the other end of the second spiral spring is connected to the pulley.

2. The screen according to claim 1, characterized in that, The lifting unit also includes a connector, and the spring-loaded end is connected to the screen body through the connector.

3. The screen according to claim 2, characterized in that, The screen also includes a friction wheel, which is disposed between the pulley and the connector, and is used to push the belt spring to unfold in a predetermined direction.

4. The screen according to claim 3, characterized in that, The screen also includes a guide groove, which is disposed on one side of the pulley. Part of the belt spring is disposed in the guide groove. The guide groove is arc-shaped, and the curvature of the guide groove gradually decreases along the winding direction of the belt spring.

5. The screen according to claim 2, characterized in that, The lifting part also includes a flexible sleeve, one end of which is fixed to the connector. The flexible sleeve is used to unfold together with the spring and to wrap around the spring on the outside.

6. The screen according to claim 1, characterized in that, The lifting unit also includes a first spiral spring, which is connected to the pulley and is used to provide the pulley with a winding torque during the winding process.

7. The screen according to claim 1, characterized in that, The screen also includes a take-up shaft and a third spiral spring. The take-up shaft is used to take up / unwind the screen body, and the third spiral spring is connected to the take-up shaft so that the screen body is tightened onto the take-up shaft during the take-up process.

8. The screen according to claim 1, characterized in that, The belt spring includes a first belt spring and a second belt spring. The first pulley is used to wind / unwind the first belt spring, and the second pulley is used to wind / unwind the second belt spring. After the first belt spring and the second belt spring are unfolded, the concave surface of the first belt spring is arranged opposite to the concave surface of the second belt spring.

9. The screen according to claim 1, characterized in that, The lifting part includes a first lifting part and a second lifting part, wherein the first lifting part is arranged along a first direction and the second lifting part is arranged along a second direction, wherein the first direction is perpendicular to the second direction.

10. The screen according to claim 9, characterized in that, An adsorption element is provided at the position where the screen body contacts the spring, and the adsorption element is used to make the screen body fit against the spring.

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