Projection device

Abstract

An embodiment of the present application discloses a projection device, belonging to the field of projection technology. The projection device includes: a projection host and a projection screen, and the projection screen includes a base, a curling mechanism, a first connecting frame, a lifting mechanism and a curtain; the curling mechanism is rotatably connected to the first connecting frame, the first connecting frame is connected to the side wall of the base, and the first connecting frame can adjust the height of the end of the curling mechanism, and the lifting mechanism is supported on the base; the first side of the curtain is fixedly connected to the curling mechanism, and the second side of the curtain opposite to the first side is fixedly connected to the lifting mechanism. In the embodiment of the present application, since the first connecting frame can adjust the height of the end of the curling mechanism, and then adjust the height of the first side of the curtain, the tension force acting on the second side of the curtain by the lifting mechanism changes. Therefore, it is possible to ensure the uniformity of the tension force acting on the curtain by the lifting mechanism through the height of the end of the curling mechanism to ensure the flatness of the curtain.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of projection technology, and particularly to a projection device. Background Art

[0002] With the continuous development of technology, projection devices are increasingly applied to people's work and life. Currently, a projection device includes a projection host and a projection screen. The light outlet of the projection device faces the projection screen, and the light beam emitted by the projection device is projected onto the projection screen, and the projection screen reflects the light beam to achieve the display of the picture. In order to ensure the display effect of the picture, it is necessary to ensure that the projection screen has a certain flatness.

[0003] In related technologies, the projection screen includes a base, a curling mechanism, a support mechanism, and a curtain. The support mechanism includes a first support frame, a second support frame, and a cross beam. The curling mechanism is rotatably fixed on the base. The first ends of the first support frame and the second support frame are connected to the base, and the second ends of the first support frame and the second support frame are connected to the cross beam. The first side edge of the curtain is fixedly connected to the curling mechanism, and the second side edge of the curtain opposite to the first side edge is fixedly connected to the cross beam. In this way, when the curtain is not in use, the first support frame and the second support frame are retracted, and at the same time, the curtain is curled by the curling mechanism; when the curtain is in use, the cross beam is supported by the first support frame and the second support frame, so that the cross beam can support the curtain to ensure the flatness of the curtain.

[0004] However, after the first support frame and the second support frame are retracted and supported multiple times, the first support frame and the second support frame are worn, that is, the effective heights of the first support frame and the second support frame for supporting the cross beam are inconsistent, so that the supporting forces of the first support frame and the second support frame on the cross beam are inconsistent, resulting in inconsistent tension forces of the cross beam on the curtain, and the curtain appears uneven. Summary of the Invention

[0005] Embodiments of the present application provide a projection device, which can solve the problem of poor flatness of the curtain of the projection screen included in the projection device. The technical solution is as follows:

[0006] On the one hand, a projection device is provided, and the projection device includes:

[0007] A projection host for emitting a light beam;

[0008] A projection screen, the projection screen including a base, a curling mechanism, a first connecting frame, a lifting mechanism, and a curtain;

[0009] The curling mechanism is rotatably connected to the first connecting frame, the first connecting frame is connected to the side wall of the base, the first connecting frame can adjust the height of the end of the curling mechanism, and the lifting mechanism is supported on the base;

[0010] The first side edge of the curtain is fixedly connected to the curling mechanism, the second side edge of the curtain opposite to the first side edge is fixedly connected to the lifting mechanism, the curling mechanism can control the curtain to be retracted, and the lifting mechanism can control the curtain to be unfolded and receive the light beam.

[0011] Optionally, the first connecting frame includes a first connecting plate, a second connecting plate and a first connecting column;

[0012] The first connecting plate includes a first side plate and a second side plate connected in an L shape, and the second connecting plate includes a third side plate and a fourth side plate connected in an L shape;

[0013] The end of the curling mechanism is rotatably limited on the first side plate, the third side plate is fixedly connected to the base, the first end of the first connecting column is fixedly connected to one of the second side plate and the fourth side plate, the second end of the first connecting column passes through the other of the second side plate and the fourth side plate and is limitedly connected, the length direction of the first connecting column is parallel to the height direction of the curtain, and the distance between the second side plate and the fourth side plate is adjustable.

[0014] Optionally, the first side plate has a limiting hole, the end of the curling mechanism extends a positioning shaft along the length direction, and the positioning shaft is rotatably limited in the limiting hole.

[0015] Optionally, the first connecting frame further includes an elastic pad, the elastic pad is in a cylindrical structure, the elastic pad is sleeved on the positioning shaft, and is clamped between the hole wall of the limiting hole and the positioning shaft.

[0016] Optionally, the side of the first side plate facing the curling mechanism has a limiting cylinder, and the end of the curling mechanism is rotatably limited in the limiting cylinder.

[0017] Optionally, the first side plate has an oblong hole, the length direction of the oblong hole is parallel to the length direction of the first connecting column, and the first side plate is fixedly connected to the side wall of the base through a fixing bolt based on the oblong hole.

[0018] Optionally, the first connecting frame further includes a sliding gasket, the sliding gasket is sleeved on the fixing bolt, and is clamped between the first side plate and the side wall of the base.

[0019] Optionally, the first end of the first connecting column is fixedly connected to the second side plate. The fourth side plate has a positioning hole. The second end of the first connecting column passes through the positioning hole and is threadedly connected to a locking nut.

[0020] Optionally, the positioning hole is an oblong hole, and the length direction of the positioning hole is perpendicular to the axial direction of the winding mechanism.

[0021] Optionally, the first connecting frame further includes a compression spring. The compression spring is sleeved on the first connecting column, and both ends of the compression spring respectively abut against the second side plate and the fourth side plate.

[0022] Optionally, the second side plate is higher than the fourth side plate.

[0023] The beneficial effects brought by the technical solution provided by the embodiments of the present application can at least include:

[0024] Since the first connecting frame can adjust the height of the end of the curling mechanism, and then adjust the height of the first side edge of the curtain, the tension of the curtain itself changes. In this way, the tension force acting on the second side edge of the curtain by the lifting mechanism changes. That is, the tension force acting on the second side edge of the curtain by the lifting mechanism changes with the change of the height of the end of the curling mechanism. In this case, when the tension force acting on the second side edge of the curtain by the lifting mechanism can be adjusted by the height of the end of the curling mechanism, the tension force acting on the curtain by the lifting mechanism can be ensured to be uniform, so as to ensure the flatness of the curtain. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 is a schematic structural diagram of a projection device provided by an embodiment of the present application;

[0027] Figure 2 is a schematic rear view structure diagram of a projection screen provided by an embodiment of the present application;

[0028] Figure 3 is a schematic axonometric structure diagram of a projection screen provided by an embodiment of the present application;

[0029] Figure 4 is a schematic structural diagram of a connection method of a curling mechanism provided by an embodiment of the present application;

[0030] Figure 5It is a schematic structural diagram of another connection method of the curling mechanism provided by an embodiment of the present application;

[0031] Figure 6 It is an exploded structural diagram of a connection method of the curling mechanism provided by an embodiment of the present application.

[0032] Reference numerals:

[0033] 1: Projection host; 2: Projection screen;

[0034] 21: Base; 22: Curling mechanism; 23: Lifting mechanism; 24: Curtain; 25: First connecting frame;

[0035] 211: Side wall; 221: Positioning shaft; 251: First connecting plate; 252: Second connecting plate; 253: First connecting column; 254: Compression spring;

[0036] 2511: First side plate; 2512: Second side plate; 2521: Third side plate; 2522: Fourth side plate;

[0037] 25111: Limiting hole; 25112: Long circular hole; 25221: Positioning hole. Specific embodiments

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0039] Figure 1 It exemplifies a schematic structural diagram of a projection device provided by an embodiment of the present application, Figure 2 It exemplifies a schematic structural diagram of a projection screen provided by an embodiment of the present application. Refer to Figure 1 and Figure 2 The projection device includes: a projection host 1 for emitting light beams; a projection screen 2 including a base 21, a curling mechanism 22, a lifting mechanism 23, and a curtain 24; the curling mechanism 22 is rotatably connected to the base 21, the lifting mechanism 23 is supported on the base 21, the first side of the curtain 24 is fixedly connected to the curling mechanism 22, the second side of the curtain 24 opposite to the first side is fixedly connected to the lifting mechanism 23, the curling mechanism 22 can control the curtain 24 to be retracted, and the lifting mechanism 23 can control the curtain 24 to be unfolded and receive the light beams.

[0040] In the embodiments of the present application, when the screen 24 is in use, the lifting mechanism 23 can support and unfold the screen 24, and then the screen 24 can receive the light beam emitted by the projection host 1; when the screen 24 is not in use, the screen 24 can be curled on the curling mechanism 22 by the rotation of the curling mechanism 22 to realize the retraction of the screen 24; in this way, by the unfolding or retraction of the screen 24, the normal projection of the screen 24 during use is ensured, and the space occupied by the projection screen 2 when not in use is reduced.

[0041] Among them, the rotatability of the curling mechanism means rotating along its own circumferential direction, that is, rotating with its own center line as the rotation axis.

[0042] Among them, the projection host 1 includes an optical engine, and the optical engine is used to emit a light beam to the screen 24.

[0043] Optionally, the optical engine is an ultra-short-throw optical engine. In order to ensure the display effect of the light beam emitted by the optical engine on the screen 24, the vertical distance from the center point of the light exit of the optical engine to the plane where the screen 24 is located when unfolded is equal to the product of the projection ratio of the optical engine and the width of the display area on the screen 24, and the width of the display area refers to the dimension in the horizontal direction.

[0044] Optionally, the base 21 has a receiving portion, the receiving portion has a light-transmitting area, the optical engine is fixed in the receiving portion, and the light beam emitted by the optical engine passes through the light-transmitting area to the screen 24. In this way, the optical engine and the projection screen 24 are connected as a whole through the base 21, so that the relative position between the optical engine and the screen 24 of the projection screen 2 can be fixed, and the situation that the optical engine moves relative to the screen 24 can be avoided.

[0045] Of course, in some other embodiments, the optical engine is a long-throw optical engine, etc., and the embodiments of the present application do not limit this.

[0046] In addition to the optical engine, the projection host 1 further includes a control circuit board, an audio processing system, a heat dissipation system, a speaker, and a radiator. The audio processing system and the heat dissipation system are respectively electrically connected to the control circuit board. The audio processing system is also electrically connected to the speaker, and the heat dissipation system is also electrically connected to the radiator. The control circuit board controls the audio processing system to process the audio information output by the control circuit board and externally play the processed audio information through the speaker. When displaying the image information and externally playing the audio information, the control circuit board can control the heat dissipation system to drive the radiator to dissipate heat to avoid the high temperature affecting the functions of each component.

[0047] In some embodiments, the curtain 24 includes a cloth body and an optical film. The first side edge of the cloth body is fixedly connected to the curling mechanism 22, and the second side edge of the cloth body opposite to the first side edge is fixedly connected to the lifting mechanism 23. The optical film is fixed on the cloth body to form a display area on the cloth body, that is, the optical film on the cloth body is the display area. In this way, by connecting the cloth body to the curling mechanism 22 and the lifting mechanism 23 respectively, the cloth body can be retracted or deployed, thereby driving the optical film to be retracted or deployed synchronously.

[0048] In some embodiments, the curling mechanism 22 includes a curling controller, a curling motor, and a winding drum. The curling controller is electrically connected to the curling motor, and the curling motor is drivingly connected to the winding drum. The first side edge of the curtain 24 is fixedly connected to the winding drum. The curling controller can control the curling motor to start or stop, and the curling motor can drive the winding drum to rotate, so as to drive the curtain 24 to rotate synchronously through the winding drum, thereby realizing curling the curtain 24 on the winding drum.

[0049] Optionally, the curling controller can control the curling motor to rotate forward or backward when receiving a control signal sent by a remote controller communicatively connected thereto. Of course, the curling controller can also be electrically connected to a control button. At this time, a control signal can be sent to the curling controller through the control button to control the curling motor to rotate forward or backward.

[0050] Optionally, the curling controller can include a single-chip microcomputer and a signal receiver. The single-chip microcomputer is electrically connected to the signal receiver and the curling motor respectively. In this way, after the signal receiver receives the control signal, the signal receiver sends the control signal to the single-chip microcomputer, and the single-chip microcomputer controls the curling motor to rotate forward or backward based on the control signal.

[0051] In some embodiments, the lifting mechanism 23 includes a plurality of first support rods, a plurality of second support rods, and a cross beam. The plurality of first support rods and the plurality of second support rods; the first end of the first support rod is connected to the base 21, the second end of the first support rod is connected to the first end of the corresponding second support rod, and the second end of the second support rod and the cross beam are all rotatably connected. The second side edge of the curtain 24 opposite to the first side edge is fixedly connected to the cross beam.

[0052] Wherein, the V-shaped opening after the connection of the first support rod and the second support rod faces the edge of the curtain 24 or faces away from the edge of the curtain 24. That is, when the lifting mechanism 23 includes two first support rods and two second support rods, the V-shaped openings after the connection of the first support rod and the second support rod are opposite to each other, or the V-shaped openings after the connection of the first support rod and the second support rod are back to back.

[0053] Optionally, the first support rod and the base 21, the first support rod and the corresponding second support rod, and the second support rod and the cross beam are all rotatably connected through a rotating shaft.

[0054] Since the base 21, the first support rod, the second support rod and the cross beam are all rotatably connected, the first support rod can be forced to rotate around the connecting part with the base 21 under the action of an external force. At this time, the first support rod drives the second support rod to rotate around the connecting part with the first support rod to support the cross beam. In this way, while supporting the cross beam, the cross beam drives the curtain 24 to unfold.

[0055] In the embodiment of the present application, after the first support rod and the second support rod rotate multiple times, wear is likely to occur, so that the height of the cross beam supported by the first support rod and the second support rod changes. Furthermore, the supporting force acting on the cross beam is uneven. At this time, the tension force acting on the curtain 24 by the cross beam is also uneven, resulting in poor flatness of the unfolded curtain 24.

[0056] In order to ensure the flatness of the curtain 24, in the first possible implementation manner, the flatness of the curtain 24 is ensured through the cooperation between the curling mechanism 22 and the base 21.

[0057] In some embodiments, such as Figure 2 or Figure 3 As shown, the projection screen 2 includes a first connecting frame 25. The end of the curling mechanism 22 is rotatably connected to the first connecting frame 25 (the end of the drum is rotatably connected to the first connecting frame 25). The first connecting frame 25 is connected to the side wall 211 of the base 21. The first connecting frame 25 can adjust the height of the end of the curling mechanism 22. In this way, since the first connecting frame 25 can adjust the height of the end of the curling mechanism 22, and then adjust the height of the first side of the curtain 24, the tension of the curtain 24 itself changes. In this way, the tension force acting on the second side of the curtain 24 by the lifting mechanism 23 (cross beam) changes. That is, the tension force acting on the second side of the curtain 24 by the lifting mechanism 23 changes with the change of the height of the end of the curling mechanism 22. In this way, when the tension force acting on the second side of the curtain 24 by the lifting mechanism 23 can be adjusted by the height of the end of the curling mechanism 22, the tension force acting on the curtain 24 by the lifting mechanism 23 can be ensured to be uniform, so as to ensure the flatness of the curtain 24.

[0058] One end of the curling mechanism 22 is connected to the base 21 through the corresponding first connecting frame 25. Of course, both ends of the curling mechanism 22 can be respectively connected to the base 21 through the corresponding first connecting frames 25. The embodiment of the present application does not limit this.

[0059] Optionally, such as Figure 4 or Figure 5As shown, the first connecting bracket 25 includes a first connecting plate 251, a second connecting plate 252, and a first connecting column 253. The first connecting plate 251 includes a first side plate 2511 and a second side plate 2512 connected to form an L shape. The second connecting plate 252 includes a third side plate 2521 and a fourth side plate 2522 connected to form an L shape. The end of the curling mechanism 22 is rotatably limited on the first side plate 2511 (the end of the reel is rotatably connected to the first side plate 2511). The third side plate 2521 is fixedly connected to the base 21. The first end of the first connecting column 253 is fixedly connected to one of the second side plate 2512 and the fourth side plate 2522. The second end of the first connecting column 253 passes through the other of the second side plate 2512 and the fourth side plate 2522 and is limited and connected. The length direction of the first connecting column 253 is parallel to the height direction of the curtain 24, and the distance between the second side plate 2512 and the fourth side plate 2522 is adjustable.

[0060] Among them, as Figure 5 shown, the second side plate 2512 is higher than the fourth side plate 2522, that is, the second side plate 2512 is located above the fourth side plate 2522. Of course, as Figure 4 shown, the second side plate 2512 is lower than the fourth side plate 2522, that is, the second side plate 2512 is located below the fourth side plate 2522.

[0061] In this way, since the distance between the second side plate 2512 and the fourth side plate 2522 is adjustable, and the length direction of the first connecting column 253 is parallel to the height direction of the curtain 24, the distance between the second side plate 2512 and the fourth side plate 2522 in the height direction of the curtain 24 is adjustable. Since the fourth side plate 2522 is fixedly connected to the base 21 through the third side plate 2521, and the second side plate 2512 is limited on the curling mechanism 22 through the first side plate 2511, the height of the curling mechanism 22 can be adjusted through the second side plate 2512 and the fourth side plate 2522, and then the height of the first side of the curtain 24 can be adjusted.

[0062] Optionally, the first end of the first connecting column 253 is fixedly connected to the second side plate 2512. The second end of the first connecting column 253 has an external thread. The second end of the first connecting column 253 passes through the fourth side plate 2522 and is threadedly connected to a locking nut. That is, as Figure 6 shown, the first end of the first connecting column 253 is fixedly connected to the second side plate 2512. The fourth side plate 2522 has a positioning hole 25221. The second end of the first connecting column 253 passes through the positioning hole 25221 and is threadedly connected to the locking nut. In this way, the length of the portion of the first connecting column 253 between the second side plate 2512 and the fourth side plate 2522 can be adjusted by the tightening degree of the locking nut at the second end of the first connecting column 253, and then the distance between the second side plate 2512 and the fourth side plate 2522 can be adjusted.

[0063] Furthermore, the positioning hole 25221 is an oblong hole, and the length direction of the positioning hole 25221 is perpendicular to the axial direction of the curling mechanism 22. When the curtain 24 is tightened by the cross beam and the curling mechanism 22, the plane where the curtain 24 is located may not be a vertical plane. At this time, when the height of the end of the curling mechanism 22 is adjusted alone, the angle between the plane where the curtain 24 is located and the horizontal plane will also change, so that the distance between the projection host 1 and the curtain 24 will change, and it is easy for the picture displayed on the curtain 24 to be deformed. Since the positioning hole 25221 is an oblong hole and the length direction is perpendicular to the axial direction of the curling mechanism 22, that is, the length direction of the positioning hole 25221 is perpendicular to the plane where the curtain 24 is located. In this way, the end of the curling mechanism 22 can be adjusted in the direction perpendicular to the plane where the curtain 24 is located to ensure the inclination angle of the curtain 24, and further ensure that the picture displayed on the curtain 24 will not be deformed.

[0064] Among them, when the first side plate 2511 is used to limit the curling mechanism 22, optionally, as Figure 6 shown, the first side plate 2511 has a limiting hole 25111, and a positioning shaft 221 extends along the length direction at the end of the curling mechanism 22. The positioning shaft 221 is rotatably limited in the limiting hole 25111. In this way, by inserting the positioning shaft 221 into the limiting hole 25111, the end of the curling mechanism 22 is limited by the first side plate 2511 to prevent the curling mechanism 22 from moving in the height direction of the curtain 24 and / or the direction perpendicular to the curtain 24.

[0065] It should be noted that the first connecting frame 25 further includes an elastic pad (not shown). The elastic pad is in a cylindrical structure. The elastic pad is sleeved on the positioning shaft 221 and clamped between the hole wall of the limiting hole 25111 and the positioning shaft 221. In this way, on the one hand, when the curling mechanism 22 rotates, the friction between the positioning shaft 221 and the limiting hole 25111 can be reduced, thereby reducing the rotation resistance of the curling mechanism 22 and at the same time reducing the noise when the curling mechanism 22 rotates. On the other hand, when the height of one end of the curling mechanism 22 is adjusted, the curling mechanism 22 will rotate slightly with the other end as the rotation center. In this way, the height of the other end of the curling mechanism 22 will also be adjusted slightly. At this time, due to the compressibility of the elastic pad, a small adjustment can be realized by the extrusion of the positioning shaft 221 at the other end of the curling mechanism 22 on the sleeved elastic pad, ensuring the normal adjustment of the height of one end of the curling mechanism 22.

[0066] Optionally, on one side of the first side plate 2511 facing the curling mechanism 22, there is a limiting cylinder (not shown), and the end of the curling mechanism 22 is rotatably limited within the limiting cylinder. In this way, by inserting the end of the curling mechanism 22 into the limiting cylinder, the first side plate 2511 limits the end of the curling mechanism 22 to prevent the curling mechanism 22 from moving in the height direction of the curtain 24 and / or in the direction perpendicular to the curtain 24.

[0067] At this time, an elastic pad in the shape of a cylindrical structure is also sleeved on the end of the curling mechanism 22 to reduce the rotational resistance of the curling mechanism 22, reduce the noise during the rotation of the curling mechanism 22, and at the same time ensure the normal adjustment of the height of the end of the curling mechanism 22.

[0068] In some embodiments, after the height adjustment of the end of the curling mechanism 22 is achieved, in order to further ensure the stability of the curling mechanism 22, as Figure 6 shown, the first side plate 2511 has an oblong hole 25112, the length direction of the oblong hole 25112 is parallel to the length direction of the first connecting column 253, and the first side plate 2511 is fixedly connected to the side wall 211 of the base 21 through a fixing bolt based on the oblong hole 25112. That is, the first side plate 2511 can be fixed to the base 21 through the fixing bolt based on the oblong hole 25112, and then the end of the curling mechanism 22 is further limited by the fixed first side plate 2511.

[0069] Among them, the length direction of the oblong hole 25112 is parallel to the length direction of the first connecting column 253, that is, the length direction of the length hole is the moving direction of the first side plate 2511, so as to avoid the situation that the first side plate 2511 cannot be fixed to the substrate due to the change in the position of the first side plate 2511 after the first side plate 2511 moves.

[0070] Furthermore, the first connecting frame 25 further includes a sliding gasket, the sliding gasket is sleeved on the fixing bolt, and is clamped between the first side plate 2511 and the side wall 211 of the base 21. In this way, through the provided sliding gasket, the resistance between the first side plate 2511 and the base 21 during the movement of the first side plate 2511 can be reduced, making the movement of the first side plate 2511 smoother.

[0071] Optionally, the sliding gasket is adhered to the side wall 211 of the base 21, and the sliding gasket has a round hole; or the sliding gasket is adhered to the first side plate 2511, and the position corresponding to the oblong hole 25112 on the sliding gasket has a through hole to avoid the sliding gasket from hindering the movement of the first side plate 2511.

[0072] In some embodiments, as Figure 4 、 Figure 5 or Figure 6As shown in the figure, the first connecting frame 25 further includes a compression spring 254. The compression spring 254 is sleeved on the first connecting column 253, and both ends of the compression spring 254 are respectively abutted against the second side plate 2512 and the fourth side plate 2522. Since the difference in the tension force of the cross beam on the curtain 24 is very small, at this time, by finely adjusting the distance between the second side plate 2512 and the fourth side plate 2522, the tension force of the cross beam acting on the curtain 24 can be ensured to be uniform. In order to prevent the adjustment range of the distance between the second side plate 2512 and the fourth side plate 2522 from being too large, the compression spring 254 can be used to prevent the distance between the second side plate 2512 and the fourth side plate 2522 from shrinking. That is, through the blocking effect of the compression spring 254, the adjustment of the distance between the second side plate 2512 and the fourth side plate 2522 is realized.

[0073] In the second possible implementation manner, the adjustment is performed through the structure of the lifting mechanism 23 itself.

[0074] In some embodiments, the lifting mechanism 23 includes a plurality of elastic tensioning mechanisms. The plurality of elastic tensioning mechanisms correspond to a plurality of first support rods one by one. The elastic tensioning mechanism is slidably supported at the connecting portion of the first support rod and the second support rod. That is, the elastic tensioning mechanism bypasses the connecting portion (rotating shaft) of the first support rod and the second support rod, and the first end of the elastic tensioning mechanism is fixedly connected to the first support rod, the second end of the elastic tensioning mechanism is fixedly connected to the second support rod, the free length of the elastic tensioning mechanism is adjustable, and the elastic tensioning mechanism can tension the first support rod and the second support rod to support the cross beam.

[0075] Since the elastic tensioning mechanism can tension the first support rod and the second support rod, the V-shaped opening formed by the first support rod and the second support rod has a tendency to expand. That is, the effective height of the first support rod and the second support rod supporting the cross beam has a tendency to increase, and thus an additional supporting force can be applied to the cross beam through the first support rod and the second support rod. And since the free length of the elastic tensioning mechanism is adjustable, that is, the tensioning force of the elastic tensioning mechanism acting on the first support rod and the second support rod is adjustable, the additional supporting force applied by the first support rod and the second support rod to the cross beam is adjustable. Therefore, when the supporting force applied to the cross beam is adjustable, the supporting force applied to the cross beam can be ensured to be uniform, that is, the tensioning force of the cross beam acting on the curtain 24 is ensured to be uniform, thereby ensuring the flatness of the curtain 24.

[0076] Optionally, the elastic tensioning mechanism includes a tension spring, a tightening member, and a flexible member. The tension spring, the tightening member, and the flexible member are connected, and both ends after connection are respectively fixedly connected to the first support rod and the second support rod. The flexible member is slidably supported at the connecting portion of the first support rod and the second support rod. That is, the flexible member bypasses the connecting portion (rotating shaft) of the first support rod and the second support rod, and the length of the tightening member is adjustable.

[0077] Optionally, the flexible member is a strip-shaped nylon rope or other strip-shaped structures, as long as it can be bent arbitrarily.

[0078] Optionally, the tightening member includes a first screw, a second screw and a second connecting column. The threads of the first screw and the second screw are opposite. The first end of the first screw is threadedly connected to the first end of the second connecting column, and the second end of the first screw is fixedly connected to the second end of the tension spring. In this way, since the threads of the first screw and the second screw are opposite, when the second connecting column is rotated relative to the first screw and the second screw, the first screw and the second screw can extend synchronously away from the first connection or retract synchronously towards the first connecting rod, so as to adjust the length of the tightening member.

[0079] Of course, in some other embodiments, the tightening member includes a third screw and a third connecting column. The first end of the third screw is threadedly connected to the first end of the third connecting column. In this way, the overall length of the tightening member can be adjusted by the relative rotation of the third screw and the third connecting column.

[0080] When adjusting the length of the tightening member, one of the third screw and the third connecting column must be rotatable. At this time, in order to prevent the member connected to the tightening member from rotating synchronously, the member is rotatably connected to one of the third screw and the third connecting column in the circumferential direction.

[0081] For the connection between the above-mentioned tension spring, tightening member and flexible member, optionally, the first end of the tension spring is fixedly connected to the first support rod, the second end of the tension spring is fixedly connected to the first end of the flexible member, the second end of the flexible member is fixedly connected to the first end of the tightening member, and the second end of the tightening member is fixedly connected to the second support rod.

[0082] At this time, combining the first structure of the above-mentioned tightening member, the second end of the first screw is fixedly connected to the second end of the flexible member, and the second end of the second screw is fixedly connected to the second support rod; or the second end of the second screw is fixedly connected to the second end of the flexible member, and the second end of the first screw is fixedly connected to the second support rod. Combining the second structure of the above-mentioned tightening member, the second end of the third screw is fixedly connected to the second end of the flexible member, and the second end of the second connecting column is rotatably connected to the second support rod in the circumferential direction; or the second end of the third screw is rotatably connected to the second end of the flexible member in the circumferential direction, and the second end of the second connecting column is fixedly connected to the second support rod, etc.

[0083] Optionally, the first end of the tension spring is fixedly connected to the first support rod, the second end of the tension spring is fixedly connected to the first end of the tightening member, the second end of the tightening member is fixedly connected to the first end of the flexible member, and the second end of the flexible member is fixedly connected to the second support rod.

[0084] At this time, in combination with the first structure of the tightening member described above, the second end of the first screw rod is fixedly connected to the second end of the tension spring, and the second end of the second screw rod is fixedly connected to the first end of the flexible member; or the second end of the second screw rod is fixedly connected to the second end of the tension spring, and the second end of the first screw rod is fixedly connected to the first end of the flexible member. In combination with the second structure of the tightening member described above, the second end of the third screw rod is fixedly connected to the second end of the tension spring, and the second end of the second connecting column is rotatably connected to the first end of the flexible member in the circumferential direction; or the second end of the third screw rod is rotatably connected to the second end of the tension spring in the circumferential direction, and the second end of the second connecting column is fixedly connected to the first end of the flexible member.

[0085] In the third possible implementation manner, the flatness of the curtain 24 is ensured by the cooperation of the first support rod and the base 21.

[0086] In some embodiments, an elastic tensioning mechanism is connected between the first support rod and the base 21, that is, the first end of the elastic tensioning mechanism is fixedly connected to the first support rod, the second end of the elastic tensioning mechanism is fixedly connected to the base 21, and the elastic tensioning mechanism is slidably supported at the connecting part (connecting shaft) of the first support rod and the base 21.

[0087] In this way, based on the support of the base 21, the first support rod is tightened by the elastic tensioning mechanism, so that the first support rod has a tendency to be propped up, and further the effective height of the cross beam supported by the first support rod and the second support rod has a tendency to become higher, so as to apply an additional support force to the cross beam through the first support rod and the second support rod. And since the free length of the elastic tensioning mechanism is adjustable, that is, the tension force applied by the elastic tensioning mechanism on the first support rod is adjustable, so that the additional support force applied by the first support rod and the second support rod on the cross beam is adjustable. Therefore, when the support force applied to the cross beam is adjustable, the uniformity of the support force applied to the cross beam can be ensured, that is, the uniformity of the tension force applied by the cross beam on the curtain 24 is ensured, so as to ensure the flatness of the curtain 24.

[0088] Among them, the structure of the elastic tensioning mechanism is the same as or similar to the structure described above. Of course, it can also be different from the structure described above, as long as the connection between the first support rod and the base 21 can be tightened. The embodiments of the present application do not limit this.

[0089] In some other embodiments, the lifting mechanism 23 includes a second connecting frame, the second connecting frame is movably fixed on the base 21, and the moving direction of the second connecting frame is parallel to the height direction when the curtain 24 is unfolded, and the first end of the first support rod is rotatably connected to the second connecting frame.

[0090] Optionally, the base 21 has an oblong hole, the length direction of the oblong hole is parallel to the height direction when the curtain 24 is unfolded, and the base 21 is connected to the second connecting frame through fixing bolts based on the oblong hole.

[0091] In this way, by removing the fixing bolts, the second connecting frame can drive the first support rod to move in the height direction when the curtain 24 is unfolded, and at the same time, the fixing bolts move in the oblong hole to ensure that the second connecting frame can be fixed to the base 21 again through the fixing bolts after moving. When the first support rod rises or falls, the second support rod rises or falls synchronously, so as to adjust the supporting effect of the second support rod on the cross beam, so as to facilitate the adjustment of the supporting force of the second support rod on the cross beam.

[0092] It should be noted that in addition to being connected in the above manner between the second connecting frame and the base 21 to realize the rise or fall of the first support rod, the rise or fall of the first support rod can also be realized by other means. For example, the height of the first support rod is adjusted by the second connecting frame itself to realize the rise or fall of the first support rod.

[0093] Exemplarily, the second connecting frame includes a fixing plate, a hinged plate and a lifting column; the fixing plate is fixedly connected to the base 21, the hinged plate is rotatably connected to the first end of the first support rod, the first end of the lifting column is fixedly connected to the hinged plate, the second end of the lifting column passes through the fixing plate and is connected in a limited way, the length direction of the lifting column is parallel to the height direction of the curtain 24, and the distance between the fixing plate and the hinged plate is adjustable. In this way, the rise and fall of the hinged plate can be realized by adjusting the distance between the fixing plate and the hinged plate, so as to synchronously realize the rise and fall of the first support rod.

[0094] It should be noted that the flatness of the curtain 24 can also be ensured by combining the above two embodiments. That is, an elastic tensioning mechanism is connected between the first support rod and the base 21, and the first support rod is connected to the base 21 through the second connecting frame (the second connecting frame can adjust the height of the first support rod relative to the base 21), and the embodiments of the present application do not limit this.

[0095] It should also be noted that for the above three ways to ensure the flatness of the curtain 24, at least one of these three ways can be used to achieve it. That is, the flatness of the curtain 24 can be ensured separately by the above three ways, or by the combination of the first way and the second way, or by the combination of the first way and the third way, or by the combination of the second way and the third way, or by the combination of the first way, the second way and the third way. The embodiments of the present application do not limit this.

[0096] In the embodiment of the present application, since the first connecting frame can adjust the height of the end of the curling mechanism, and then adjust the height of the first side of the curtain, the tension of the curtain itself changes, so that the tension force acting on the second side of the curtain by the lifting mechanism changes. That is, the tension force acting on the second side of the curtain by the lifting mechanism changes with the change of the height of the end of the curling mechanism. In this way, when the tension force acting on the second side of the curtain by the lifting mechanism can be adjusted by the height of the end of the curling mechanism, the tension force acting on the curtain by the lifting mechanism can be ensured to be uniform, so as to ensure the flatness of the curtain.

[0097] The above are only the preferred embodiments of the present application, and are not intended to limit the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the embodiments of the present application shall be included in the protection scope of the embodiments of the present application.

Claims

1. A projection device, characterized in that, The projection device includes: A projection host for emitting light beams; A projection screen including a base, a curling mechanism, a first connecting frame, a lifting mechanism, and a curtain; There are two first connecting frames. Both ends of the curling mechanism are rotatably connected to the corresponding first connecting frames. The two first connecting frames are respectively connected to the opposite side walls of the base. The first connecting frame can adjust the height of the end of the curling mechanism. The lifting mechanism is supported on the base; The first side of the curtain is fixedly connected to the curling mechanism. The second side of the curtain opposite to the first side is fixedly connected to the lifting mechanism. The curling mechanism can control the curtain to be retracted. The lifting mechanism can control the curtain to be unfolded and receive the light beam.

2. The projection device according to claim 1, wherein The first connecting frame includes a first connecting plate, a second connecting plate, and a first connecting column; The first connecting plate includes a first side plate and a second side plate connected in an L shape. The second connecting plate includes a third side plate and a fourth side plate connected in an L shape; The end of the curling mechanism is rotatably limited on the first side plate. The third side plate is fixedly connected to the base. The first end of the first connecting column is fixedly connected to one of the second side plate and the fourth side plate. The second end of the first connecting column passes through the other of the second side plate and the fourth side plate and is limitedly connected. The length direction of the first connecting column is parallel to the height direction of the curtain, and the distance between the second side plate and the fourth side plate is adjustable.

3. The projection device according to claim 2, characterized in that, The first side plate has a limiting hole. The end of the curling mechanism extends a positioning shaft along the length direction. The positioning shaft is rotatably limited in the limiting hole.

4. The projection device according to claim 3, wherein The first connecting frame further includes an elastic pad. The elastic pad is in a cylindrical structure. The elastic pad is sleeved on the positioning shaft and clamped between the hole wall of the limiting hole and the positioning shaft.

5. The projection device according to claim 2, characterized in that, On the side of the first side plate facing the curling mechanism, there is a limiting cylinder. The end of the curling mechanism is rotatably limited in the limiting cylinder.

6. The projection device according to any one of claims 2-5, characterized in that, The first side plate has an oblong hole. The length direction of the oblong hole is parallel to the length direction of the first connecting column. The first side plate is fixedly connected to the side wall of the base based on the oblong hole through a fixing bolt.

7. The projection device according to claim 6, characterized in that, The first connecting frame further includes a sliding gasket. The sliding gasket is sleeved on the fixing bolt and clamped between the first side plate and the side wall of the base.

8. The projection device according to any one of claims 2-5, characterized in that, The first end of the first connecting column is fixedly connected to the second side plate. The fourth side plate has a positioning hole. The second end of the first connecting column passes through the positioning hole and is threadedly connected to a locking nut.

9. The projection device according to claim 8, characterized in that, The positioning hole is an oblong hole. The length direction of the positioning hole is perpendicular to the axial direction of the curling mechanism.

10. The projection device according to any one of claims 2-5, characterized in that, The first connecting frame further includes a compression spring. The compression spring is sleeved on the first connecting column, and both ends of the compression spring respectively abut against the second side plate and the fourth side plate.

11. The projection device according to any one of claims 2-5, characterized in that, The second side plate is higher than the fourth side plate.

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