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. The projection screen includes a base, a curling mechanism, a curtain, and a lifting mechanism. The lifting mechanism includes a first support rod, a second support rod, an elastic tensioning mechanism, and a cross beam. The base, the first support rod, the second support rod, and the cross beam are rotatably connected. The second side of the curtain is fixedly connected to the cross beam; both ends of the elastic tensioning mechanism are fixedly connected to the first support rod and the second support rod respectively. 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, and the curtain can be unfolded and receive light beams after the cross beam is supported. In the embodiment of the present application, the elastic tensioning mechanism enables the supporting forces applied by the first support rod and the second support rod on the cross beam to be adjustable, thereby ensuring the uniformity of the supporting force applied on the cross beam and thus ensuring the flatness of the curtain.

Description

Technical Field

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

[0002] With the continuous development of technology, projection devices are increasingly applied in 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 usually necessary to ensure that the projection screen has a certain flatness.

[0003] In the related art, 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 height of the first support frame supporting the cross beam and the effective height of the second support frame 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 including a base, a curling mechanism, a curtain, and a lifting mechanism;

[0009] The curling mechanism is rotatably connected to the base, the first side edge of the curtain is fixedly connected to the curling mechanism, and the curling mechanism can control the curtain to be retracted;

[0010] The lifting mechanism includes a plurality of first support rods, a plurality of second support rods, a plurality of elastic tensioning mechanisms and a cross beam, and the plurality of first support rods, the plurality of second support rods, and the plurality of elastic tensioning mechanisms correspond to each other one by one;

[0011] The first end of the first support rod is rotatably connected to the base, the second end of the first support rod is rotatably connected to the first end of the corresponding second support rod, and the second end of the second support rod is rotatably connected to the cross beam. The second side of the curtain opposite to the first side is fixedly connected to the cross beam;

[0012] The elastic tensioning mechanism is slidably supported at the connecting portion 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, and 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, and the curtain can be unfolded and receive the light beam after the cross beam is supported.

[0013] Optionally, the elastic tensioning mechanism includes a tension spring, a tightening member and a flexible member;

[0014] The tension spring, the tightening member and the flexible member are connected, and the two 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, and the length of the tightening member is adjustable.

[0015] 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.

[0016] 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.

[0017] Optionally, the tightening member includes a first screw rod, a second screw rod and a first connecting column;

[0018] The threads of the first screw rod and the second screw rod are opposite. The first end of the first screw rod is threadedly connected to the first end of the first connecting column, and the second end of the first screw rod is fixedly connected to the second end of the tension spring;

[0019] The first end of the second screw is threadedly connected to the second end of the first connecting column, and the second end of the second screw is fixedly connected to the first end of the flexible member.

[0020] Optionally, the tightening member includes a third screw and a second connecting column;

[0021] The first end of the third screw is threadedly connected to the first end of the second connecting column, the second end of the third screw 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.

[0022] Optionally, the V-shaped opening after the first support rod and the second support rod are connected faces the edge of the curtain or faces away from the edge of the curtain.

[0023] Optionally, the elastic tensioning mechanism is further connected between the first support rod and the base.

[0024] Optionally, the lifting mechanism further includes a first connecting frame, the first connecting frame is movably fixed on the base, and the moving direction of the first connecting frame is parallel to the height direction when the curtain is unfolded, and the first end of the first support rod is rotatably connected to the first connecting frame.

[0025] Optionally, the base has an oblong hole, the length direction of the oblong hole is parallel to the height direction when the curtain is unfolded, and the base is connected to the first connecting frame through a fixing bolt based on the oblong hole.

[0026] The beneficial effects brought by the technical solution provided by the embodiments of the present application can at least include:

[0027] Since the elastic tensioning mechanism can tension the first support rod and the second support rod, so that 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 for supporting the cross beam has a tendency to increase, and further 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 can be adjusted, that is, the tensioning force of the elastic tensioning mechanism acting on the first support rod and the second support rod can be adjusted, so that the additional supporting force applied by the first support rod and the second support rod to the cross beam can be adjusted. Therefore, when the supporting force applied to the cross beam can be adjusted, the uniformity of the supporting force applied to the cross beam can be ensured, that is, the uniformity of the tensioning force of the cross beam acting on the curtain can be ensured, thereby ensuring the flatness of the curtain. Description of the Drawings

[0028] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying 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 accompanying drawings can be obtained based on these drawings.

[0029] Figure 1 It is a schematic structural diagram of a projection device provided by an embodiment of the present application;

[0030] Figure 2 It is a schematic structural diagram of a projection screen provided by an embodiment of the present application;

[0031] Figure 3 It is a schematic structural diagram of the projection screen after the curtain is retracted provided by an embodiment of the present application;

[0032] Figure 4 It is a schematic structural diagram of another projection screen provided by an embodiment of the present application;

[0033] Figure 5 It is a schematic side view structural diagram of a projection screen provided by an embodiment of the present application;

[0034] Figure 6 It is a schematic structural diagram of the tightening member with the length not adjusted provided by an embodiment of the present application;

[0035] Figure 7 It is a schematic cross-sectional structural diagram of the tightening member with the length not adjusted provided by an embodiment of the present application;

[0036] Figure 8 It is a schematic structural diagram of the tightening member after the length is adjusted provided by an embodiment of the present application.

[0037] Reference numerals:

[0038] 1: Projection host; 2: Projection screen;

[0039] 21: Base; 22: Coiling mechanism; 23: Lifting mechanism; 24: Curtain;

[0040] 211: Side wall; 231: First support rod; 232: Second support rod; 233: Cross beam; 234: Elastic tension mechanism;

[0041] 2341: Tensile spring; 2342: Tightening member; 2343: Flexible member;

[0042] 23421: First screw; 23422: Second screw; 23423: First connecting column. Detailed implementation manners

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will further describe the implementation manners of this application in detail with reference to the accompanying drawings.

[0044] Figure 1 The schematic structural diagram of a projection device provided by an embodiment of this application is exemplified. Figure 2 The schematic structural diagram of a projection screen provided by an embodiment of this application is exemplified. As Figure 1 and Figure 2 shown, the projection device includes: a projection host 1, and the projection host 1 is used for emitting light beams; a projection screen 2, and the projection screen 2 includes a base 21, a curling mechanism 22, a lifting mechanism 23, and a screen 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 screen 24 is fixedly connected to the curling mechanism 22, the second side of the screen 24 opposite to the first side is fixedly connected to the lifting mechanism 23, the curling mechanism 22 can control the screen 24 to be retracted, and the lifting mechanism 23 can control the screen 24 to be unfolded and receive the light beams.

[0045] In the embodiments of this application, when using the screen 24, as Figure 2 shown, the screen 24 can be supported and unfolded by the lifting mechanism 23, and then the light beams emitted by the projection host 1 can be received through the screen 24; when not using the screen 24, as Figure 3 shown, 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.

[0046] 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.

[0047] Among them, the projection host 1 includes an optical engine, and the optical engine is used for emitting light beams to the screen 24.

[0048] Optionally, the optical engine is an ultra-short-throw optical engine. To ensure the display effect of the light beams 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.

[0049] 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 optical engine is prevented from moving relative to the screen 24.

[0050] Of course, in some other embodiments, the optical engine is a telephoto optical engine, etc., which is not limited in the embodiments of the present application.

[0051] In addition to the optical engine, the projection host 1 also 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 electrically connected to the control circuit board respectively, 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 plays the processed audio information out through the speaker. When the image information is displayed on the screen and the audio information is played out, the control circuit board can control the heat dissipation system to drive the radiator to dissipate heat to avoid high temperature affecting the functions of various components.

[0052] In some embodiments, the curtain 24 includes a cloth body and an optical film, a first side of the cloth body is fixedly connected to the rolling mechanism 22, a second side of the cloth body opposite to the first side is fixedly connected to the lifting mechanism 23, and the optical film is fixed to 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 rolling mechanism 22 and the lifting mechanism 23 respectively, the cloth body can be folded or unfolded, thereby driving the optical film to be folded or unfolded synchronously.

[0053] In some embodiments, the rolling mechanism 22 includes a rolling controller, a rolling motor and a reel, the rolling controller is electrically connected to the rolling motor, the rolling motor is drivingly connected to the reel, and the first side of the curtain 24 is fixedly connected to the reel. The rolling controller can control the start or stop of the rolling motor, and the rolling motor can drive the reel to rotate, so as to drive the curtain 24 to rotate synchronously through the reel, thereby achieving the purpose of rolling the curtain 24 on the reel.

[0054] Optionally, the curling controller can control the curling motor to rotate forward or reverse when receiving a control signal sent by a remote controller connected to the curling controller. Of course, the curling controller can also be electrically connected to a control button, and a control signal can be sent to the curling controller through the control button to control the curling motor to rotate forward or reverse.

[0055] Optionally, the curling controller may 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.

[0056] In some embodiments, such as Figure 4 or Figure 5 shown, the lifting mechanism 23 includes a plurality of first support rods 231, a plurality of second support rods 232 and a cross beam 233. The plurality of first support rods 231 and the plurality of second support rods 232; the first end of the first support rod 231 is connected to the base 21, the second end of the first support rod 231 is connected to the first end of the corresponding second support rod 232, and the second end of the second support rod 232 is rotatably connected to the cross beam 233. The second side of the curtain 24 opposite to the first side is fixedly connected to the cross beam 233.

[0057] Wherein, the V-shaped opening after the connection of the first support rod 231 and the second support rod 232 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 231 and two second support rods 232, as Figure 3 shown, the V-shaped openings after the connection of the first support rod 231 and the second support rod 232 are opposite, or as Figure 2 shown, the V-shaped openings after the connection of the first support rod 231 and the second support rod 232 are back to back.

[0058] Optionally, the first support rod 231 and the base 21, between the first support rod 231 and the corresponding second support rod 232, and between the second support rod 232 and the cross beam 233 are all rotatably connected through a rotating shaft.

[0059] Since the base 21, the first support rod 231, the second support rod 232 and the cross beam 233 are all rotatably connected, it is possible to promote the first support rod 231 to rotate around the connection part with the base 21 under the action of an external force. At this time, the first support rod 231 drives the second support rod 232 to rotate around the connection part with the first support rod 231 to support the cross beam 233. In this way, while supporting the cross beam 233, the cross beam 233 drives the curtain 24 to unfold.

[0060] In the embodiments of the present application, after the first support rod 231 and the second support rod 232 rotate multiple times, it is easy to wear, so that the height of the cross beam 233 supported by the first support rod 231 and the second support rod 232 changes, and then the supporting force acting on the cross beam 233 is uneven. At this time, the tension force of the cross beam 233 acting on the curtain 24 is also uneven, resulting in poor flatness of the unfolded curtain 24.

[0061] In order to ensure the flatness of the curtain 24, in the first possible implementation, adjustment is made through the structure of the lifting mechanism 23 itself.

[0062] In some embodiments, such as Figure 4 or Figure 5 As shown, the lifting mechanism 23 includes a plurality of elastic tensioning mechanisms 234. The plurality of elastic tensioning mechanisms 234 correspond one-to-one with a plurality of first support rods 231. The elastic tensioning mechanism 234 is slidably supported at the connecting portion of the first support rod 231 and the second support rod 232, that is, the elastic tensioning mechanism 234 bypasses the connecting portion (rotating shaft) of the first support rod 231 and the second support rod 232, and the first end of the elastic tensioning mechanism 234 is fixedly connected to the first support rod 231, the second end of the elastic tensioning mechanism 234 is fixedly connected to the second support rod 232, the free length of the elastic tensioning mechanism 234 is adjustable, and the elastic tensioning mechanism 234 can tension the first support rod 231 and the second support rod 232 to support the cross beam 233.

[0063] Since the elastic tensioning mechanism 234 can tension the first support rod 231 and the second support rod 232, the V-shaped opening formed by the first support rod 231 and the second support rod 232 has a tendency to expand, that is, the effective height of the first support rod 231 and the second support rod 232 supporting the cross beam 233 has a tendency to increase, and thus an additional supporting force can be applied to the cross beam 233 through the first support rod 231 and the second support rod 232. And since the free length of the elastic tensioning mechanism 234 is adjustable, that is, the tensioning force of the elastic tensioning mechanism 234 acting on the first support rod 231 and the second support rod 232 is adjustable, the additional supporting force applied by the first support rod 231 and the second support rod 232 to the cross beam 233 is adjustable. Therefore, when the supporting force applied to the cross beam 233 is adjustable, the supporting force applied to the cross beam 233 can be ensured to be uniform, that is, the tensioning force of the cross beam 233 acting on the curtain 24 is ensured to be uniform, thereby ensuring the flatness of the curtain 24.

[0064] Optionally, as Figure 4 or Figure 5 As shown, the elastic tensioning mechanism 234 includes a tension spring 2341, a tightening member 2342 and a flexible member 2343. The tension spring 2341, the tightening member 2342 and the flexible member 2343 are connected, and the two ends after connection are respectively fixedly connected to the first support rod 231 and the second support rod 232. The flexible member 2343 is slidably supported at the connecting portion of the first support rod 231 and the second support rod 232, that is, the flexible member 2343 bypasses the connecting portion (rotating shaft) of the first support rod 231 and the second support rod 232, and the length of the tightening member 2342 is adjustable.

[0065] Optionally, the flexible member 2343 is a strip-shaped nylon rope or other strip-shaped structure, as long as it can be bent arbitrarily.

[0066] Optionally, as Figure 6 , Figure 7 or Figure 8 shown, the tightening member 2342 includes a first screw 23421, a second screw 23422, and a first connecting column 23423. The threads of the first screw 23421 and the second screw 23422 are opposite. The first end of the first screw 23421 is threadedly connected to the first end of the first connecting column 23423, and the second end of the first screw 23421 is fixedly connected to the second end of the tension spring 2341. In this way, since the threads of the first screw 23421 and the second screw 23422 are opposite, when rotating the first connecting column 23423 relative to the first screw 23421 and the second screw 23422, the first screw 23421 and the second screw 23422 can synchronously extend away from the first connection or synchronously retract towards the first connecting rod to adjust the length of the tightening member 2342.

[0067] Of course, in some other embodiments, the tightening member 2342 includes a third screw (not shown) and a second connecting column (not shown). The first end of the third screw is threadedly connected to the first end of the second connecting column. In this way, the overall length of the tightening member 2342 can be adjusted by the relative rotation of the third screw and the second connecting column. It should be noted that when adjusting the length of the tightening member 2342, one of the third screw and the second connecting column must be able to rotate. At this time, in order to prevent the member connected to the tightening member 2342 from rotating synchronously, the member is rotatably connected to one of the third screw and the second connecting column in the circumferential direction.

[0068] For the connection between the above-mentioned tension spring 2341, tightening member 2342, and flexible member 2343, optionally, the first end of the tension spring 2341 is fixedly connected to the first support rod 231, the second end of the tension spring 2341 is fixedly connected to the first end of the flexible member 2343, the second end of the flexible member 2343 is fixedly connected to the first end of the tightening member 2342, and the second end of the tightening member 2342 is fixedly connected to the second support rod 232.

[0069] At this time, in combination with the first structure of the tightening member 2342, the second end of the first screw 23421 is fixedly connected to the second end of the flexible member 2343, and the second end of the second screw 23422 is fixedly connected to the second support rod 232; or the second end of the second screw 23422 is fixedly connected to the second end of the flexible member 2343, and the second end of the first screw 23421 is fixedly connected to the second support rod 232. In combination with the second structure of the tightening member 2342, the second end of the third screw is fixedly connected to the second end of the flexible member 2343, and the second end of the second connecting column is rotatably connected to the second support rod 232 in the circumferential direction; or the second end of the third screw is rotatably connected to the second end of the flexible member 2343 in the circumferential direction, and the second end of the second connecting column is fixedly connected to the second support rod 232, etc.

[0070] Optionally, as Figure 4 or Figure 5 shown, the first end of the tension spring 2341 is fixedly connected to the first support rod 231, the second end of the tension spring 2341 is fixedly connected to the first end of the tightening member 2342, the second end of the tightening member 2342 is fixedly connected to the first end of the flexible member 2343, and the second end of the flexible member 2343 is fixedly connected to the second support rod 232.

[0071] At this time, in combination with the first structure of the tightening member 2342, the second end of the first screw 23421 is fixedly connected to the second end of the tension spring 2341, and the second end of the second screw 23422 is fixedly connected to the first end of the flexible member 2343; or the second end of the second screw 23422 is fixedly connected to the second end of the tension spring 2341, and the second end of the first screw 23421 is fixedly connected to the first end of the flexible member 2343. In combination with the second structure of the tightening member 2342, the second end of the third screw is fixedly connected to the second end of the tension spring 2341, and the second end of the second connecting column is rotatably connected to the first end of the flexible member 2343 in the circumferential direction; or the second end of the third screw is rotatably connected to the second end of the tension spring 2341 in the circumferential direction, and the second end of the second connecting column is fixedly connected to the first end of the flexible member 2343.

[0072] In the second possible implementation manner, the flatness of the curtain 24 is ensured through the cooperation of the first support rod 231 and the base 21.

[0073] In some embodiments, an elastic tensioning mechanism 234 is connected between the first support rod 231 and the base 21, that is, the first end of the elastic tensioning mechanism 234 is fixedly connected to the first support rod 231, the second end of the elastic tensioning mechanism 234 is fixedly connected to the base 21, and the elastic tensioning mechanism 234 is slidably supported at the connection part (connection shaft) of the first support rod 231 and the base 21.

[0074] In this way, based on the support of the base 21, the first support rod 231 is tightened by the elastic tension mechanism 234, so that the first support rod 231 has a tendency to rise. Furthermore, the effective height of the first support rod 231 and the second support rod 232 for supporting the cross beam 233 has a tendency to increase, so as to apply an additional support force to the cross beam 233 through the first support rod 231 and the second support rod 232. Since the free length of the elastic tension mechanism 234 can be adjusted, that is, the tension force of the elastic tension mechanism 234 acting on the first support rod 231 can be adjusted, the additional support force applied by the first support rod 231 and the second support rod 232 to the cross beam 233 can be adjusted. Therefore, when the support force applied to the cross beam 233 can be adjusted, the uniformity of the support force applied to the cross beam 233 can be ensured, that is, the uniformity of the tension force of the cross beam 233 acting on the curtain 24 can be ensured, thereby ensuring the flatness of the curtain 24.

[0075] Among them, the structure of the elastic tension 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 it can realize the connection between the first support rod 231 and the base 21. The embodiments of the present application do not limit this.

[0076] In some other embodiments, the lifting mechanism 23 includes a first connecting frame (not shown). The first connecting frame is movably fixed on the base 21, and the moving direction of the first connecting frame is parallel to the height direction when the curtain 24 is unfolded. The first end of the first support rod 231 is rotatably connected to the first connecting frame.

[0077] 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. The base 21 is connected to the first connecting frame through a fixing bolt based on the oblong hole.

[0078] In this way, by removing the fixing bolt, the first connecting frame can drive the first support rod 231 to move in the height direction when the curtain 24 is unfolded, and at the same time, the fixing bolt moves in the oblong hole to ensure that the first connecting frame can be fixed to the base 21 again through the fixing bolt after the first connecting frame moves. When the first support rod 231 rises or falls, the second support rod 232 rises or falls synchronously, so as to adjust the supporting effect of the second support rod 232 on the cross beam 233, so as to facilitate the adjustment of the supporting force of the second support rod 232 on the cross beam 233.

[0079] It should be noted that, in addition to being connected in the above manner between the first connecting frame and the base 21 to realize the rise or fall of the first support rod 231, the rise or fall of the first support rod 231 can also be realized by other means. For example, the height of the first support rod 231 is adjusted by the first connecting frame itself to realize the rise or fall of the first support rod 231.

[0080] Exemplarily, the first 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 231, 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 with a limit, 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, by adjusting the distance between the fixing plate and the hinged plate, the lifting of the hinged plate can be realized, so as to synchronously realize the lifting of the first support rod 231.

[0081] It should also 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 234 is connected between the first support rod 231 and the base 21, and the first support rod 231 is connected to the base 21 through the first connecting frame (the first connecting frame can adjust the height of the first support rod 231 relative to the base 21), and the embodiments of the present application do not make any limitations in this regard.

[0082] In the third possible implementation manner, the flatness of the curtain 24 is ensured through the cooperation between the curling mechanism 22 and the base 21.

[0083] In some embodiments, the projection screen 2 includes a second connecting frame (not shown), the end of the curling mechanism 22 is rotatably connected to the second connecting frame (the end of the drum is rotatably connected to the second connecting frame), the second connecting frame is connected to the side wall 211 of the base 21, and the second connecting frame can adjust the height of the end of the curling mechanism 22. In this way, since the first connecting frame 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, so that the tension force acting on the second side of the curtain 24 by the lifting mechanism 23 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 case, 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 made uniform, so as to ensure the flatness of the curtain 24.

[0084] One end of the curling mechanism 22 is connected to the base 21 through the corresponding second connecting frame. Of course, both ends of the curling mechanism 22 can be respectively connected to the base 21 through the corresponding second connecting frames, and the embodiments of the present application do not make any limitations in this regard.

[0085] Optionally, the second connecting frame includes a first connecting plate, a second connecting plate, and a third connecting column. The first connecting plate includes a first side plate and a second side plate connected to form an L shape. The second connecting plate includes a third side plate and a fourth side plate connected to form an L shape. The end of the curling mechanism 22 is rotatably limited on the first side plate (the end of the reel is rotatably connected to the first side plate). The third side plate is fixedly connected to the base 21. The first end of the third connecting column is fixedly connected to one of the second side plate and the fourth side plate. The second end of the third connecting column passes through the other of the second side plate and the fourth side plate and is limited and connected. The length direction of the third connecting column is parallel to the height direction of the curtain 24, and the distance between the second side plate and the fourth side plate is adjustable.

[0086] Wherein, the second side plate is higher than the fourth side plate, that is, the second side plate is located above the fourth side plate. Of course, the second side plate is lower than the fourth side plate, that is, the second side plate is located below the fourth side plate.

[0087] In this way, since the distance between the second side plate and the fourth side plate is adjustable, and the length direction of the third connecting column is parallel to the height direction of the curtain 24, the distance between the second side plate and the fourth side plate in the height direction of the curtain 24 is adjustable. Since the fourth side plate is fixedly connected to the base 21 through the third side plate, and the second side plate is limited on the curling mechanism 22 through the first side plate, the height of the curling mechanism 22 can be adjusted through the second side plate and the fourth side plate, and then the height of the first side edge of the curtain 24 can be adjusted.

[0088] Optionally, the first end of the third connecting column is fixedly connected to the second side plate. The second end of the third connecting column has an external thread, and the second end of the third connecting column passes through the fourth side plate and is threadedly connected to a locking nut. That is, the first end of the third connecting column is fixedly connected to the second side plate. The fourth side plate has a positioning hole. The second end of the third connecting column passes through the positioning hole and is threadedly connected to the locking nut. In this way, the length of the portion of the third connecting column between the second side plate and the fourth side plate can be adjusted by the tightening degree of the locking nut at the second end of the third connecting column, and then the distance between the second side plate and the fourth side plate can be adjusted.

[0089] Further, the positioning hole is an oblong hole, and the length direction of the positioning hole is perpendicular to the axial direction of the curling mechanism 22. Since when the curtain 24 is tightened by the cross beam 233 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 changes, and it is easy for the picture displayed on the curtain 24 to be deformed. Since the positioning hole is an oblong hole and its length direction is perpendicular to the axial direction of the curling mechanism 22, that is, the length direction of the positioning hole 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.

[0090] Among them, when the curling mechanism 22 is limited by the first side plate, optionally, as shown in the figure ···, the first side plate has a limiting hole, and a positioning shaft extends along the length direction at the end of the curling mechanism 22, and the positioning shaft is rotatably limited in the limiting hole. In this way, by inserting the positioning shaft into the limiting hole, the end of the curling mechanism 22 is limited by the first side plate 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.

[0091] It should be noted that the second connecting frame further includes an elastic pad. The elastic pad is in a cylindrical structure, sleeved on the positioning shaft, and clamped between the hole wall of the limiting hole and the positioning shaft. In this way, on the one hand, when the curling mechanism 22 rotates, the friction between the positioning shaft and the limiting hole 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, the elastic pad sleeved on the positioning shaft at the other end of the curling mechanism 22 can be squeezed through the positioning shaft, so as to realize a small adjustment and ensure the normal adjustment of the height of one end of the curling mechanism 22.

[0092] Optionally, the side of the first side plate facing the curling mechanism 22 has a limiting cylinder, and the end of the curling mechanism 22 is rotatably limited in the limiting cylinder. In this way, by inserting the end of the curling mechanism 22 into the limiting cylinder, the end of the curling mechanism 22 is limited by the first side plate 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.

[0093] 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 ensure the normal adjustment of the height of the end of the curling mechanism 22.

[0094] In some embodiments, after the height of the end of the curling mechanism 22 is adjusted, in order to further ensure the stability of the curling mechanism 22, the first side plate has a long circular hole, the length direction of the long circular hole is parallel to the length direction of the third connecting column, and the first side plate is fixedly connected to the side wall 211 of the base 21 through a fixing bolt based on the long circular hole. That is, the first side plate can be fixed to the base 21 through the fixing bolt based on the long circular hole, and then the end of the curling mechanism 22 can be further limited by the fixed first side plate.

[0095] Among them, the length direction of the long circular hole is parallel to the length direction of the third connecting column, that is, the length direction of the length hole is the moving direction of the first side plate, so as to avoid the situation that the first side plate cannot be fixed to the substrate due to the change in the position of the first side plate after the first side plate moves.

[0096] Furthermore, the second 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 211 of the base 21. In this way, through the provided sliding gasket, the resistance between the first side plate and the base 21 during the movement of the first side plate can be reduced, making the movement of the first side plate smoother.

[0097] Optionally, the sliding gasket is bonded to the side wall 211 of the base 21, and the sliding gasket has a circular hole; or the sliding gasket is bonded to the first side plate, and a through hole is provided at the position corresponding to the long circular hole on the sliding gasket to avoid the sliding gasket from hindering the movement of the first side plate.

[0098] In some embodiments, the second connecting frame further includes a compression spring, the compression spring is sleeved on the third connecting column, and both ends of the compression spring respectively abut against the second side plate and the fourth side plate. Since the difference in the tension force of the cross beam 233 on the curtain 24 is very small, at this time, by finely adjusting the distance between the second side plate and the fourth side plate, the tension force of the cross beam 233 acting on the curtain 24 can be ensured to be uniform. And in order to avoid the adjustment range of the distance between the second side plate and the fourth side plate from being too large, the reduction of the distance between the second side plate and the fourth side plate can be hindered by the compression spring, that is, through the hindering effect of the compression spring, the adjustment of the distance between the second side plate and the fourth side plate is realized.

[0099] It should be noted that for the above three methods of ensuring the flatness of the curtain 24, it can be achieved by at least one of these three methods. That is, the flatness of the curtain 24 can be ensured separately by the above three methods, or by the combination of the first method and the second method, or by the combination of the first method and the third method, or by the combination of the second method and the third method, or by the combination of the first method, the second method and the third method. The embodiments of the present application do not make any limitations in this regard.

[0100] In the embodiments of the present application, 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 for supporting the cross beam has a tendency to increase, and thus an additional supporting force can be applied to the cross beam by the first support rod and the second support rod. And since the free length of the elastic tensioning mechanism can be adjusted, that is, the tensioning force of the elastic tensioning mechanism acting on the first support rod and the second support rod can be adjusted, the additional supporting force applied by the first support rod and the second support rod to the cross beam can be adjusted. Therefore, when the supporting force applied to the cross beam can be adjusted, the uniformity of the supporting force applied to the cross beam can be ensured. That is, the uniformity of the tensioning force of the cross beam acting on the curtain can be ensured, thereby ensuring the flatness of the curtain.

[0101] 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 curtain, and a lifting mechanism. The curling mechanism is rotatably connected to the base. The first side of the curtain is fixedly connected to the curling mechanism, and the curling mechanism can control the curtain to be retracted. The lifting mechanism includes a plurality of first support rods, a plurality of second support rods, a plurality of elastic tensioning mechanisms, and a cross beam. The plurality of first support rods, the plurality of second support rods, and the plurality of elastic tensioning mechanisms correspond to each other one by one. The first end of the first support rod is connected to the base, the second end of the first support rod is rotatably connected to the first end of the corresponding second support rod, and the second end of the second support rod is rotatably connected to the cross beam. The second side of the curtain opposite to the first side is fixedly connected to the cross beam. 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. The curtain can be unfolded after the cross beam is supported and receive the light beam. The elastic tensioning mechanism includes a tension spring, a tightening member, and a flexible member, and the length of the tightening member is adjustable. The first end of the tension spring is fixedly connected to the first support rod. The tightening member includes a first screw rod, a second screw rod, and a first connecting column. The threads of the first screw rod and the second screw rod are opposite. The first end of the first screw rod is threadedly connected to the first end of the first connecting column, the second end of the first screw rod is fixedly connected to the second end of the tension spring, and the first end of the second screw rod is threadedly connected to the second end of the first connecting column. The flexible member is slidably supported at the connecting portion of the first support rod and the second support rod. The first end of the flexible member is fixedly connected to the second end of the second screw rod, and the second end of the flexible member is fixedly connected to the second support rod.

2. The projection device according to claim 1, characterized in that, The V-shaped opening after the connection of the first support rod and the second support rod faces the edge of the curtain or faces away from the edge of the curtain.

3. The projection device according to claim 1, characterized in that, An elastic tensioning mechanism is also connected between the first support rod and the base.

4. The projection device according to claim 1, wherein The lifting mechanism further includes a first connecting frame movably fixed to the base, and the moving direction of the first connecting frame is parallel to the height direction when the curtain is unfolded. The first end of the first support rod is rotatably connected to the first connecting frame.

5. The projection device according to claim 4, wherein, The base has an oblong hole, and the length direction of the oblong hole is parallel to the height direction when the curtain is unfolded. The base is connected to the first connecting frame through a fixing bolt based on the oblong hole.

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