Projection screen

Abstract

The embodiment of the present application discloses a projection screen, which belongs to the field of projection technology. The projection screen includes: a first frame, a second frame, a hinge mechanism, a limiter, a flexible curtain and a tensioning mechanism; the first frame and the second frame are rotatably connected through the hinge mechanism; the limiter is used to limit the first frame and the second frame in a coplanar position to form a rectangular frame; the flexible curtain is attached to the front of the rectangular frame, and the edge of the flexible curtain is folded to wrap the edge of the rectangular frame; the tensioning mechanism is used to tighten the edge of the flexible curtain on the back of the rectangular frame, and the tensioning mechanism can also adjust the tension of the flexible curtain. In the embodiment of the present application, when the transportation of the projection screen is restricted, the tensioning mechanism is adjusted to loosen the flexible curtain, and then the limiter is removed, so that the first frame and the second frame are relatively rotated in the state where the flexible curtain is relaxed, so as to fold the first frame and the second frame, reduce the space occupied by the projection screen, and ensure the normal transportation of the projection screen.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of projection technology, and particularly to a projection screen. Background Art

[0002] With the continuous development of technology, projection devices are increasingly applied in people's work and life. Currently, projection devices mainly include a projection host and a projection screen. Among them, the light outlet of the projection host faces the projection screen to emit a light beam to the projection screen, and the projection screen is used to receive the light beam to achieve the display of the picture.

[0003] In related technologies, in order to improve the viewing effect and at the same time improve the anti-reflection and eye protection effects, the size of the projection screen is getting larger and larger. However, with the continuous pursuit of large-size projection screens, especially projection screens with a size of 100 inches and above, the space occupied by the projection screen will also increase, which will inevitably increase the transportation difficulty of the projection screen. Summary of the Invention

[0004] The embodiments of the present application provide a projection screen that can ensure the transportation of the projection screen in the case of a large size. The technical solution is as follows:

[0005] A projection screen, the projection screen includes: a first frame, a second frame, a hinge mechanism, a limiting member, a flexible curtain and a tensioning mechanism;

[0006] The first frame and the second frame are rotatably connected through the hinge mechanism;

[0007] The limiting member is detachably and fixedly connected to the first frame and the second frame, and the limiting member is used to limit the first frame and the second frame in a coplanar position to form a rectangular frame;

[0008] The flexible curtain is attached to the front of the rectangular frame, and the edge of the flexible curtain is folded over to wrap the edge of the rectangular frame;

[0009] The tensioning mechanism is used to tension the edge of the flexible curtain on the back of the rectangular frame, and the tensioning mechanism can also adjust the tension degree of the flexible curtain.

[0010] Optionally, the limiting member is a U-shaped card slot, and the card slot is detachably buckled on the first frame and the second frame.

[0011] Optionally, the limiting member is a fixed cross beam, and the fixed cross beam is detachably and fixedly connected to the first frame and the second frame.

[0012] Optionally, the hinge mechanism is a 180-degree limit hinge.

[0013] Optionally, the first frame includes an upper frame, a lower frame, and side frames;

[0014] Two ends of the side frames are respectively fixedly connected to a first end of the upper frame and a first end of the lower frame to form a right-angled U-shaped frame, and hinge mechanisms are connected to a second end of the upper frame and a second end of the lower frame.

[0015] Optionally, the first frame further includes angle irons, and the side frames are fixedly connected to the upper frame and the lower frame through the angle irons respectively.

[0016] Optionally, the first frame further includes vertical beams, and two ends of the vertical beams are respectively fixedly connected to the upper frame and the lower frame.

[0017] Optionally, the tensioning mechanism includes a support rod and a tensioning member;

[0018] The edge of the flexible curtain has accommodation pockets, and the support rods are arranged in the accommodation pockets at corresponding positions of the first frame and the second frame;

[0019] One end of the tensioning member is connected to the support rod, and the other end of the tensioning member is connected to the frame corresponding to the support rod.

[0020] Optionally, the tensioning member is a tension spring, a first end of the tension spring is connected to the support rod through a hook, and a second end of the tension spring is connected to the frame corresponding to the support rod through a hook.

[0021] Optionally, the tensioning member includes a first clamping strip and an adjusting screw;

[0022] A first end of the first clamping strip is connected to the support rod, a first through hole is formed in the frame corresponding to the support rod, and the adjusting screw passes through the first through hole and is threadedly connected to a second end of the first clamping strip.

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

[0024] In the embodiment of the present application, after the first frame and the second frame are rotated to a coplanar position based on the hinge mechanism, they are limited by a limiting member to ensure the plane of the rectangular frame. Then, the tensioning mechanism is adjusted to tension the flexible curtain, so as to ensure the flatness of the flexible curtain, and further ensure the normal use of the projection screen. When the transportation of the projection screen is limited, the tensioning mechanism is adjusted to loosen the flexible curtain, and then the limiting member is disassembled. Since the flexible curtain is in a relaxed state, the first frame and the second frame can be relatively rotated to fold the first frame and the second frame, reducing the space occupied by the projection screen and ensuring the normal transportation of the projection screen. Description of the Drawings

[0025] 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 It is a schematic rear view structure diagram of a projection screen provided by an embodiment of the present application;

[0027] Figure 2 It is a schematic structure diagram of a projection screen after being folded in half provided by an embodiment of the present application;

[0028] Figure 3 It is an exploded structure diagram of a first frame provided by an embodiment of the present application;

[0029] Figure 4 It is a schematic structure diagram of a hinge mechanism provided by an embodiment of the present application;

[0030] Figure 5 It is an exploded structure diagram of another hinge mechanism provided by an embodiment of the present application;

[0031] Figure 6 It is a schematic diagram of the rotation process of another hinge mechanism provided by an embodiment of the present application;

[0032] Figure 7 It is a schematic structure diagram of another projection screen provided by an embodiment of the present application;

[0033] Figure 8 It is a partial side view structure diagram of a first frame provided by an embodiment of the present application;

[0034] Figure 9 It is a schematic structure diagram of a flexible curtain provided by an embodiment of the present application;

[0035] Figure 10 It is an exploded structure diagram of another projection screen provided by an embodiment of the present application;

[0036] Figure 11 It is a schematic structure diagram of a type of support rod provided by an embodiment of the present application;

[0037] Figure 12 It is a schematic structure diagram of a tensioning member tensioning a flexible curtain provided by an embodiment of the present application;

[0038] Figure 13 It is a schematic structure diagram of another tensioning member tensioning a flexible curtain provided by an embodiment of the present application;

[0039] Figure 14 This is another structural schematic diagram of a tensioning member for tensioning a flexible curtain provided by an embodiment of the present application.

[0040] Reference numerals:

[0041] 1: First frame; 2: Second frame; 3: Hinge mechanism; 4: Limiting member; 5: Flexible curtain; 6: Tensioning mechanism; 7: Fixed clip;

[0042] 11: Upper frame; 12: Lower frame; 13: Side frame; 14: Angle iron; 15: Vertical beam; 16: Limiting groove;

[0043] 31: First hinge; 32: Second hinge; 33: Rotating shaft; 34: First flap; 35: Second flap;

[0044] 341: First hinge member; 342: First connecting rod; 351: Second hinge member; 352: Second connecting rod;

[0045] 41: Fixed cross beam;

[0046] 51: Accommodating pocket; 52: Curtain sheet; 53: Flexible carrier;

[0047] 61: Support rod; 62: Tensioning member;

[0048] 611: First type of support rod; 612: Second type of support rod;

[0049] 621: Tension spring; 622: First clamping strip; 623: Adjusting screw; 624: Second clamping strip; 625: Limiting rod; 626: Tensioning rod. Detailed implementation manners

[0050] 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.

[0051] Figure 1 An example of a structural schematic diagram of a projection screen according to an embodiment of the present application is shown. As Figure 1 shown, the projection screen includes: a first frame 1, a second frame 2, a hinge mechanism 3, a limiting member 4, a flexible curtain 5, and a tensioning mechanism 6; the first frame 1 and the second frame 2 are rotatably connected through the hinge mechanism 3; the limiting member 4 is detachably and fixedly connected to the first frame 1 and the second frame 2, and the limiting member 4 is used to limit the first frame 1 and the second frame 2 in a coplanar position to form a rectangular frame; the flexible curtain 5 is attached to the front of the rectangular frame, and the edges of the flexible curtain 5 are folded over to wrap the edges of the rectangular frame; the tensioning mechanism 6 is used to tension the edges of the flexible curtain 5 on the back of the rectangular frame, and the tensioning mechanism 6 can also adjust the tension degree of the flexible curtain 5.

[0052] In the embodiment of the present application, after the first frame 1 and the second frame 2 are rotated to the coplanar position based on the hinge mechanism 3, they are limited by the limiting member 4 to ensure the plane of the rectangular frame. Then, the tensioning mechanism 6 is adjusted to tension the flexible curtain 5, so as to ensure the flatness of the flexible curtain 5, and further ensure the normal use of the projection screen. When the transportation of the projection screen is limited, the tensioning mechanism 6 is adjusted to loosen the flexible curtain 5, and then the limiting member 4 is disassembled. Since the flexible curtain 5 is in a relaxed state, the first frame 1 and the second frame 2 can be rotated relative to each other to fold the first frame 1 and the second frame 2, reducing the space occupied by the projection screen and ensuring the normal transportation of the projection screen.

[0053] Wherein, the backs of the first frame 1 and the second frame 2 are connected by the hinge mechanism 3. At this time, after loosening the tension of the flexible curtain 5 by the tensioning mechanism 6, the first frame 1 and the second frame 2 can be folded back to back to reduce the space occupied by the projection screen; alternatively, the fronts of the first frame 1 and the second frame 2 are connected by the hinge mechanism 3. At this time, after loosening the tension of the flexible curtain 5 by the tensioning mechanism 6, the first frame 1 and the second frame 2 can be folded face to face to reduce the space occupied by the projection screen. After the first frame 1 and the second frame 2 are folded, in order to prevent the first frame 1 and the second frame 2 from rotating relative to each other, as Figure 2 shown, the projection screen further includes a fixing clip 7. At this time, the fixing clip 7 can be buckled on the first frame 1 and the second frame 2 to realize the relative limitation of the first frame 1 and the second frame 2.

[0054] It should be noted that when the fronts of the first frame 1 and the second frame 2 are connected by the hinge mechanism 3, in order to prevent the protrusion of the hinge mechanism 3 from affecting the flatness of the flexible curtain 5, both the first frame 1 and the second frame 2 have grooves. In this way, the hinge mechanism 3 is respectively settled in the grooves and connected to the first frame 1 and the second frame 2. In addition, in order to ensure that the first frame 1 and the second frame 2 can be folded face to face better, the edge of the flexible curtain 5 has a notch corresponding to the joint of the first frame 1 and the second frame 2.

[0055] Next, each component included in the projection screen in the embodiment of the present application will be introduced.

[0056] In the embodiment of the present application, the structure of the first frame 1 is the same as or similar to the structure of the second frame 2. Therefore, next, only the structure of the first frame 1 will be explained, and the structure of the second frame 2 can refer to the structure of the first frame 1.

[0057] Optionally, as Figure 3As shown in the figure, the first frame 1 includes an upper frame border 11, a lower frame border 12, and side frame borders 13. The two ends of the side frame borders 13 are respectively fixedly connected to the first end of the upper frame border 11 and the first end of the lower frame border 12 to form a right-angled U-shaped frame. Of course, in addition to being a right-angled U-shaped frame, the first frame 1 can also be a frame of other shapes. For example, the first frame 1 is rectangular or a right-angled trapezoid.

[0058] Among them, for the right-angled U-shaped frame, the lengths of the upper frame border 11 and the lower frame border 12 can be the same. Of course, they can also be different. The embodiments of the present application do not limit this. In addition, hinge mechanisms 3 are connected to the second ends of both the upper frame border 11 and the lower frame border 12. And when the hinge mechanisms 3 are located on the front side of the first frame 1, the second ends of both the upper frame border 11 and the lower frame border 12 have grooves.

[0059] When the side frame borders 13 are respectively fixedly connected to the upper frame border 11 and the lower frame border 12, optionally, the first end of the side frame border 13 has a first card slot, the first end of the upper frame border 11 has a first protrusion, and the first protrusion is limited in the first card slot to realize the fixed connection between the side frame border 13 and the upper frame border 11. The second end of the side frame border 13 has a second card slot, the first end of the lower frame border 12 has a second protrusion, and the second protrusion is limited in the second card slot to realize the fixed connection between the side frame border 13 and the lower frame border 12.

[0060] Among them, the positions of the first card slot and the first protrusion, as well as the second card slot and the second protrusion, can also be swapped, as long as the corresponding fixed connections between the two ends of the side frame border 13 and the first ends of the upper frame border 11 and the lower frame border 12 can be realized. The embodiments of the present application do not limit this.

[0061] Of course, in addition to realizing the fixed connections between the side frame border 13 and the upper frame border 11 and the lower frame border 12 through the cooperation of the above-mentioned card slots and protrusions, other methods can also be used to realize the fixed connections between the side frame border 13 and the upper frame border 11 and the lower frame border 12. For example, as Figure 3 shown in the figure, the first frame 1 further includes angle irons 14. The side frame borders 13 are fixedly connected to the upper frame border 11 and the lower frame border 12 through the angle irons 14 respectively. That is, between the first end of the side frame border 13 and the first end of the upper frame border 11, and between the second end of the side frame border 13 and the first end of the lower frame border 12, they are fixedly connected through the angle irons 14 respectively.

[0062] Among them, the angle iron 14 has a planar structure, and the angle sides of the angle iron 14 have threaded holes. The ends of the side frame 13, the first end of the upper frame 11, and the first end of the lower frame 12 all have through holes corresponding to the threaded holes. In this way, the fixing screws can pass through the through holes and be screwed into the corresponding threaded holes, so as to realize the fixed connection between the side frame 13, the upper frame 11, and the lower frame 12 and the angle sides of the angle iron 14 respectively, and further realize the fixed connection between the side frame 13 and the upper frame 11 and the lower frame 12 respectively.

[0063] In addition, for the right-angled U-shaped frame, when the first frame 1 is not fixedly connected to the hinge mechanism 3, the second ends of the upper frame 11 and the lower frame 12 included in the first frame 1 are in a suspended state, which is likely to cause deformation of the first frame 1 under the action of external forces. Therefore, as Figure 3 shown, the first frame 1 further includes a vertical beam 15, and both ends of the vertical beam 15 are fixedly connected to the upper frame 11 and the lower frame 12 respectively. In this way, the upper frame 11 and the lower frame 12 can be supported by the vertical beam 15, avoiding the possibility of deformation of the first frame 1.

[0064] Optionally, both ends of the vertical beam 15 are fixedly connected to the second ends of the upper frame 11 and the lower frame 12 respectively, so as to be able to provide better support for the upper frame 11 and the lower frame 12. In addition, when the first frame 1 and the second frame 2 are rotatably connected through the hinge mechanism 3, combining Figure 1 and Figure 3 shown, the hinge mechanism 3 can also be connected to the vertical beam 15, and the embodiments of the present application do not limit this.

[0065] In the embodiments of the present application, a 180-degree limit hinge can be selected as the hinge mechanism 3, so that when the first frame 1 and the second frame 2 rotate relative to each other, the first frame 1 and the second frame 2 can be limited to a coplanar position through the hinge mechanism 3. Of course, other angle-limiting hinges can also be selected, as long as it can ensure that the first frame 1 and the second frame 2 rotate to the coplanar position and at the same time rotate to reduce the space occupied by the projection screen, and the embodiments of the present application do not limit this.

[0066] In some embodiments, as Figure 4 shown, the hinge mechanism 3 includes a first hinge 31, a second hinge 32, and a rotating shaft 33. The first hinge 31 and the second hinge 32 are connected by the rotating shaft 33 to realize the relative rotation of the first hinge 31 and the second hinge 32. Among them, the first hinge 31 is fixedly connected to the first frame 1, and the second hinge 32 is fixedly connected to the second frame 2, thereby realizing the relative rotation of the first frame 1 and the second frame 2.

[0067] In addition, one side of the first hinge 31 and the second hinge 32 both has a protrusion, and then the rotating shaft 33 is passed through the protrusion to realize the rotatable connection between the first hinge 31 and the second hinge 32. At this time, when the first hinge 31 and the second hinge 32 rotate to the coplanar position, one end of the first hinge 31 close to the rotating shaft 33 abuts against one end of the second hinge 32 close to the rotating shaft 33, thereby realizing the 180-degree limit of the first hinge 31 and the second hinge 32.

[0068] In some other embodiments, as Figure 5 shown, the hinge mechanism 3 includes a first flap 34 and a second flap 35. The first flap 34 includes a first hinge member 341 and a first connecting rod 342. The second flap 35 includes a second hinge member 351 and a second connecting rod 352. The cross-sections of the first hinge member 341 and the second hinge member 351 are both L-shaped. One side plate of the first hinge member 341 has a first chute and is fixedly connected to the first end of the first connecting rod 342. One side plate of the second hinge member 351 has a second chute and is fixedly connected to the first end of the second connecting rod 352. The second end of the first connecting rod 342 is slidably limited in the second chute, and the second end of the second connecting rod 352 is slidably limited in the first chute.

[0069] In this way, as Figure 6 shown, based on the sliding of the second end of the first connecting rod 342 in the second chute and the sliding of the second connecting rod 352 in the first chute, the folding of the first flap 34 and the second flap 35 can be realized, and then the correspondence between the first frame 1 and the second frame 2 can be realized. Among them, the other side plate of the first hinge member 341 is fixedly connected to the first frame 1, and the other side plate of the second hinge member 351 is fixedly connected to the second frame 2, thereby realizing the relative rotation of the first frame 1 and the second frame 2.

[0070] Of course, in addition to the structures described in the above two ways, the hinge mechanism 3 can also be other structures, and the embodiments of the present application do not limit this.

[0071] In the embodiments of the present application, the limiting member 4 is mainly used to limit the first frame 1 and the second frame 2 after they are coplanar. Therefore, in some embodiments, the limiting member 4 is a U-shaped card slot, and the card slot is detachably buckled on the first frame 1 and the second frame 2. In this way, since the card slot is buckled on both the first frame 1 and the second frame 2 at the same time, the relative rotation of the first frame 1 and the second frame 2 is avoided.

[0072] Among them, since the outer edges of the first frame 1 and the second frame 2 are both wrapped by the flexible curtain 5, at this time, the card slot can be buckled on the inner edges of the first frame 1 and the second frame 2. In addition, the positions of the first frame 1 and the second frame 2 corresponding to the card slot have grooves. In this way, after the card slot is buckled on the first frame 1 and the second frame 2, the card slot can sink into the grooves, thereby ensuring the flatness of the flexible curtain 5.

[0073] In some other embodiments, as Figure 7 shown, the limiting member 4 is a fixed cross beam 41, and the fixed cross beam 41 is detachably and fixedly connected to the first frame 1 and the second frame 2 respectively. In this way, after the first frame 1 and the second frame 2 are rotated to the coplanar position, the relative rotation of the first frame 1 and the second frame 2 can be avoided through the fixed connection between the fixed cross beam 41 and the first frame 1 and the second frame 2 respectively.

[0074] Among them, when the fixed cross beam 41 is fixedly connected to the first frame 1 and the second frame 2 respectively, in order to ensure that the edges of the rectangular frame formed after the fixed connection are flush, as Figure 8 shown, the first frame 1 further has a limiting groove 16. Similarly, the second frame 2 also has a limiting groove 16. At this time, the cross beam can be limited in the limiting grooves 16 of the first frame 1 and the second frame 2, so as to avoid the phenomenon of uneven height at the edges of the rectangular frame through the limiting grooves 16.

[0075] Of course, in addition to being a U-shaped card slot or a fixed cross beam 41, the limiting member 4 can also be other components, as long as the first frame 1 and the second frame 2 can be limited in the coplanar position. The embodiments of the present application do not make any limitations in this regard.

[0076] In the embodiments of the present application, as Figure 9 shown, the flexible curtain 5 includes a curtain sheet 52 and a flexible carrier 53. The curtain sheet 52 is fixed on the first side of the flexible carrier 53, and the edge of the flexible carrier 53 extends out of the four side edges of the curtain sheet 52; the second side of the flexible carrier 53 is attached to the front surface of the rectangular frame, and the edge of the flexible carrier 53 is folded to wrap the edge of the rectangular frame, and the tensioning mechanism 6 is used to tension the edge of the flexible carrier 53 on the back surface of the rectangular frame.

[0077] Among them, the curtain sheet 52 is an optical film sheet, and the optical film sheet is used in cooperation with the projection host. The projection host is used to emit light beams to the optical film sheet, and the optical film sheet is used to receive and reflect the light beams to display images. The curtain sheet 52 can be fixed on the flexible carrier 53 by means of bonding.

[0078] Among them, the flexible carrier 53 can be a flexible cloth. Of course, it can also be other flexible components, as long as it can be bent arbitrarily and has a certain flatness after being tensioned. The embodiments of the present application do not make any limitations in this regard.

[0079] The projection of the flexible carrier 53 on the plane where the curtain sheet 52 is located covers the curtain sheet 52 or the four side edges of the curtain sheet 52, so as to ensure that the edge of the flexible carrier 53 extends out of the four side edges of the curtain sheet 52, and further ensure the flatness of the curtain sheet 52 while tensioning the flexible carrier 53.

[0080] When the projection of the flexible carrier 53 on the plane where the screen 52 is located covers the screen 52, the flexible carrier 53 is circular or rectangular, etc. When the projection of the flexible carrier 53 on the plane where the screen 52 is located covers the four sides of the screen 52, the flexible carrier 53 is in a shape of a loop. Of course, in addition to being circular, rectangular, or in a loop shape, the flexible carrier 53 can also be other rectangles, as long as after the screen 52 is fixed on the flexible carrier 53, the edge of the flexible carrier 53 extends out of the four sides of the curtain, and the extended part can be bent to the back of the rectangular frame. The embodiments of the present application do not limit this.

[0081] In some embodiments, the tensioning mechanism 6 includes a tensioning member 62. At this time, one end of the tensioning member 62 is directly connected to the edge of the flexible curtain 5, and the other end of the tensioning member 62 is connected to the back of the rectangular frame to achieve tensioning of the edge of the flexible curtain 5.

[0082] Optionally, the tensioning member 62 is a tension spring 621. Of course, the tensioning member 62 can also be other structures, and the embodiments of the present application do not limit this.

[0083] In other embodiments, as Figure 10 shown, the tensioning mechanism 6 includes a support rod 61 and a tensioning member 62; the edge of the flexible curtain 5 has a receiving pocket 51, and the support rod 61 is provided in the receiving pocket 51 at the corresponding positions of the first frame 1 and the second frame 2; one end of the tensioning member 62 is connected to the support rod 61, and the other end of the tensioning member 62 is connected to the frame corresponding to the support rod 61.

[0084] In this way, through the overall support of the support rod 61 for the edge of the flexible curtain 5, and then through the tensioning of the support rod 61 by the tensioning member 62, the overall tensioning of the edge of the flexible curtain 5 by the tensioning member 62 is realized, thereby ensuring the uniformity of the tensioning of the flexible curtain 5 and avoiding the phenomenon that the flexible curtain 5 has wrinkles due to a large local tension degree.

[0085] Among them, the type number of the support rod 61 and the length of each type of support rod 61 can be set according to the length of the frame edges included in the first frame 1 and the second frame 2. Exemplarily, as Figure 11 shown, both the first frame 1 and the second frame 2 are the same U-shaped frames. At this time, the side frames 13 of the first frame 1 and the side frames 13 of the second frame 2 correspond to the first type of support rod 611, and the length of the first type of support rod 611 is equal to the length of the side frame 13. The upper frame 11 and the lower frame 12 of the first frame 1, and the upper frame 11 and the lower frame 12 of the second frame 2 correspond to the second type of support rod 612, and the length of the second type of support rod 612 is equal to the length of the upper frame 11.

[0086] Optionally, as Figure 12As shown, the tension member 62 is the tension spring 621 described in the above embodiment. At this time, the first end of the tension spring 621 is connected to the support rod 61 through a hook, and the second end of the tension spring 621 is connected to the corresponding frame of the support rod 61 through a hook.

[0087] Among them, the flexible curtain 5 has a second through hole. The hook at the first end of the tension spring 621 passes through the second through hole and is hung on the support rod 61; the back of the frame of the frame body has a hanging groove, and the hook at the second end of the tension spring 621 is hung on the hanging groove.

[0088] Optionally, as Figure 13 shown, the tension member 62 includes a first strip 622 and an adjusting screw 623; the first end of the first strip 622 is connected to the support rod 61, and the corresponding frame of the support rod 61 has a first through hole. The adjusting screw 623 passes through the first through hole and is threadedly connected to the second end of the first strip 622.

[0089] Among them, the end of the adjusting screw 623 that is not connected to the first strip 622 is limited to the other side of the first through hole. In this way, the adjusting screw 623 can be rotated relative to the first strip 622 to adjust the length of the tension member 62, thereby adjusting the tension on the support rod 61 and realizing the adjustment of the tension of the flexible curtain 5.

[0090] In some embodiments, the first end of the first strip 622 has a receiving groove, and the support rod 61 is limited in the receiving groove and can slide in the receiving groove. In this way, based on the sliding of the support rod 61 in the receiving groove, the first strip 622 can be slidably limited on the support rod 61 from the end of the support rod 61, and at the same time, the position of the first strip 622 in the length direction of the support rod 61 can be adjusted.

[0091] Among them, the opening size of the receiving groove is smaller than the diameter of the support rod 61 to realize the limitation of the support rod 61 in the receiving groove. Of course, the support rod 61 can also be limited in the receiving groove by other means, and the embodiments of the present application do not limit this.

[0092] Among them, when the support rod 61 is limited in the receiving groove, the receiving pocket 51 at the edge of the flexible curtain 5 is also located in the receiving groove. Thus, the opening side of the receiving groove will inevitably contact the flexible curtain 5. Therefore, the opening side of the receiving groove has a flexible pad to avoid scratching the flexible curtain 5 by the opening side of the receiving groove, thereby avoiding the damage of the flexible curtain 5.

[0093] In other embodiments, the first end of the first strip 622 has a hook, and the flexible curtain 5 has a second through hole. The hook passes through the second through hole and is hung on the rod body. In this way, a second through hole can be provided at the position where the flexible curtain 5 needs to be tightened, and then the hook of the first strip 622 can be passed through the second through hole to be hung on the support rod 61.

[0094] Optionally, as Figure 14 shown, the tensioning member 62 includes a second clamping strip 624, a limiting rod 625, and a tensioning rod 626; the first end of the second clamping strip 624 is connected to the support rod 61, the second end of the second clamping strip 624 has a limiting groove 16, and the first end of the limiting rod 625 is rotatably limited within the limiting groove 16; the first end of the tensioning rod 626 is rotatably connected to the corresponding frame of the support rod 61, and the middle of the tensioning rod 626 is rotatably connected to the second end of the limiting rod 625.

[0095] In this way, when an external force acts to cause the tensioning rod 626 to rotate away from the support rod 61, at this time, the tensioning rod 626 drives the second end of the limiting rod 625 to move away from the support rod 61, and further drives the second clamping strip 624 to move through the limiting rod 625, so as to realize the tensioning of the support rod 61.

[0096] Among them, when the tensioning rod 626 rotates to a position where the first end of the limiting rod 625, the first end of the tensioning rod 626, and the second end of the limiting rod 625 are on the same straight line, at this time, the reverse acting force of the flexible curtain 5 on the limiting rod 625 acts on the rotation shafts 33 of the limiting rod 625 and the tensioning rod 626, so as to realize the limitation of the tensioning rod 626.

[0097] Of course, the tensioning rod 626 can also be limited by a limiting pin. Exemplarily, the tensioning member 62 further includes a limiting pin. The limiting rod 625 has a first limiting hole, the tensioning rod 626 has a second limiting hole, and the limiting pin is used to extend into the first limiting hole and the second limiting hole. Further, a row of first limiting holes is provided on the limiting rod 625 along the length direction, and the limiting pin can be inserted into different first limiting holes, so as to adjust the tension degree of the tensioning member 62 on the support rod 61.

[0098] Among them, the structure of the first end of the second clamping strip 624 is the same as or similar to the structure of the first end of the first clamping strip 622. Of course, they can also be different, as long as the connection with the support rod 61 can be realized. The embodiments of the present application do not make any limitations in this regard.

[0099] It should be noted that the above introduction of the tensioning member 62, based on the first structure in cooperation with the support rod 61, the tensioning mechanism 6 does not have the function of adjusting the tension degree of the flexible curtain 5, and based on the second structure or the third structure in cooperation with the support rod 61, the tensioning mechanism 6 has the function of adjusting the tension degree of the flexible curtain 5.

[0100] It should also be noted that when the edge of the flexible curtain 5 is tensioned by the tensioning mechanism 6, a structure of the tensioning member 62 can be selected to realize the tensioning of the edge of the flexible curtain 5. Of course, multiple structures of the tensioning member 62 can also be selected to realize the tensioning of the edge of the flexible curtain 5. The embodiments of the present application do not make any limitations in this regard.

[0101] In the embodiment of the present application, after the first frame and the second frame are rotated to the coplanar position based on the hinge mechanism, they are limited by the limiting member to ensure the plane of the rectangular frame. Then, the tensioning mechanism is adjusted to tension the flexible curtain, so as to ensure the flatness of the flexible curtain, and further ensure the normal use of the projection screen. When the transportation of the projection screen is limited, the tensioning mechanism is adjusted to loosen the flexible curtain, and then the limiting member is disassembled. Since the flexible curtain is in a relaxed state, the first frame and the second frame can be relatively rotated to fold the first frame and the second frame, reducing the space occupied by the projection screen and ensuring the normal transportation of the projection screen.

[0102] The above are only illustrative embodiments of the 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 screen, characterized in that: The projection screen comprises: a first frame, a second frame, a hinge mechanism, a limiter, a flexible curtain and a tensioning mechanism; The first frame and the second frame are rotatably connected via the hinge mechanism; The limiting member is detachably fixedly connected to the first frame and the second frame, and the limiting member is used to limit the first frame and the second frame to a coplanar position to form a rectangular frame; The flexible curtain is attached to the front of the rectangular frame, and the edge of the flexible curtain is folded to wrap the edge of the rectangular frame; The tensioning mechanism is used to tighten the edge of the flexible curtain onto the back of the rectangular frame, and the tensioning mechanism can also adjust the tension of the flexible curtain; Wherein, the tensioning mechanism comprises a support rod and a tensioning member; The edge of the flexible curtain is provided with a receiving pocket, and the receiving pockets at corresponding positions of the first frame and the second frame are provided with the supporting rods; One end of the tensioning member is connected to the support rod, and the other end of the tensioning member is connected to the frame corresponding to the support rod; The tensioning member comprises a first clamping strip, a limiting rod and a tensioning rod; The first end of the first clamping strip is connected to the support rod, the second end of the first clamping strip has a limiting groove, and the first end of the limiting rod can be rotatably limited in the limiting groove; The first end of the tension rod is rotatably connected to the frame corresponding to the support rod, and the middle part of the tension rod is rotatably connected to the second end of the limiting rod.

2. The projection screen according to claim 1, characterized in that The limiting member is a U-shaped slot, and the slot can be detachably buckled on the first frame and the second frame.

3. The projection screen according to claim 1, characterized in that: The limiting member is a fixed crossbeam, and the fixed crossbeam is detachably fixedly connected to the first frame and the second frame.

4. The projection screen according to any one of claims 1 to 3, characterized in that: The hinge mechanism is a 180-degree limit hinge.

5. The projection screen according to claim 1, characterized in that: The first frame includes an upper frame, a lower frame and a side frame; The two ends of the side frame are respectively fixedly connected to the first end of the upper frame and the first end of the lower frame to form a right-angle U-shaped frame, and the second end of the upper frame and the second end of the lower frame are both connected to the hinge mechanism.

6. The projection screen according to claim 5, characterized in that The first frame further comprises angle irons, and the side frame and the upper frame, as well as the side frame and the lower frame are fixedly connected via the angle irons.

7. The projection screen according to claim 5 or 6, characterized in that: The first frame further includes a vertical beam, and two ends of the vertical beam are respectively fixedly connected to the upper frame and the lower frame.

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