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, an intermediate frame, a connector, a flexible curtain and a tensioning mechanism; the intermediate frame is detachably fixedly connected between the first frame and the second frame by a connector 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. In the embodiment of the present application, when the transportation of the projection screen is restricted, the connector is disassembled to disassemble the connection between the intermediate frame and the first frame and the second frame, and then the intermediate frame is taken out from between the first frame and the second frame. At this time, there is a certain gap between the first frame and the second frame, and they are connected by a flexible curtain, so that the space occupied by the projection screen can be reduced by bending the flexible curtain, thereby ensuring 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 in particular to a projection screen. Background Art

[0002] With the continuous development of science and technology, projection equipment is increasingly used in people's work and life. At present, projection equipment mainly includes 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 realize the display of the picture.

[0003] In the related art, in order to improve the viewing effect and 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 of 100 inches and above, the space occupied by the projection screen will also increase, which will inevitably increase the difficulty of transporting the projection screen. Summary of the invention

[0004] The embodiment of the present application provides a projection screen, which 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, comprising: a first frame, a second frame, an intermediate frame, a connecting piece, a flexible curtain and a tensioning mechanism;

[0006] The middle frame is detachably fixedly connected between the first frame and the second frame through the connecting member to form a rectangular frame;

[0007] 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;

[0008] The tensioning mechanism is used to tighten the edge of the flexible curtain onto the back side of the rectangular frame.

[0009] Optionally, the connecting member is a guide rod;

[0010] The first end of the guide rod is fixedly connected to the first frame, the second frame has a slideway, the second end of the guide rod is located in the slideway, and the second frame can slide along the guide rod;

[0011] The middle frame has a first limiting groove, and the middle frame is limited on the guide rod through the first limiting groove, and is detachably fixedly connected to the guide rod.

[0012] Optionally, the inner wall of the slideway has a first limiting structure, and the second end of the guide rod has a second limiting structure, and the first limiting structure and the second limiting structure are used to cooperate to limit the second end of the guide rod.

[0013] Optionally, the connecting member is a connecting plate, the connecting plate is fixed to the middle frame, and both ends of the connecting plate extend out of the middle frame;

[0014] The first frame has a second limiting groove, the second frame has a third limiting groove, the two ends of the connecting plate are respectively limited in the second limiting groove and the third limiting groove, and the two ends of the connecting plate are respectively detachably fixedly connected to the first frame and the second frame.

[0015] Optionally, the connecting plate and the intermediate frame are an integrated structure.

[0016] Optionally, the middle frame includes a first frame and a second frame;

[0017] The first frame is parallel to the second frame, and the first frame and the second frame are both detachably fixedly connected between the first frame and the second frame via the connecting member.

[0018] Optionally, the middle frame further comprises a vertical beam, and two ends of the vertical beam are respectively fixedly connected to the first frame and the second frame;

[0019] The edge of the flexible curtain has notches at positions corresponding to the joint seams between the first frame and the middle frame, and at positions corresponding to the joint seams between the second frame and the middle frame.

[0020] Optionally, the tensioning mechanism comprises a support rod and a tensioning member;

[0021] The edge of the flexible curtain has a receiving pocket, and the receiving pockets at corresponding positions of the first frame, the second frame and the middle frame all have the supporting rods;

[0022] One end of the tensioning member is connected to the support rod, and the other end of the tensioning member is connected to a frame corresponding to the support rod.

[0023] Optionally, the tensioning member includes a first clamping strip, a limiting rod and a tensioning rod;

[0024] The first end of the first clamping strip is connected to the support rod, the second end of the first clamping strip has a fourth limiting groove, and the first end of the limiting rod can be rotatably limited in the fourth limiting groove;

[0025] 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.

[0026] Optionally, the tensioning member further includes a limiting pin, the limiting rod has a first limiting hole, the tensioning rod has a second limiting hole, and the limiting pin is used to extend into the first limiting hole and the second limiting hole.

[0027] The beneficial effects of the technical solution provided by the embodiments of the present application include at least:

[0028] In an embodiment of the present application, the middle frame is spliced ​​between the first frame and the second frame, and the middle frame is fixedly connected to the first frame and the second frame through a connecting piece. Then, by tightening the edge of the flexible screen by the tightening mechanism, the flatness of the flexible screen can be ensured, thereby ensuring the normal use of the projection screen. When the transportation of the projection screen is restricted, the connecting piece is disassembled to disassemble the connection between the middle frame and the first frame and the second frame, and then the middle frame is taken out from between the first frame and the second frame. At this time, there is a certain gap between the first frame and the second frame, and they are connected by the flexible screen. In this way, the space occupied by the projection screen can be reduced by bending the flexible screen, thereby ensuring the normal transportation of the projection screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 is a schematic diagram of a rear view structure of a projection screen provided in an embodiment of the present application;

[0031] Figure 2 is a structural schematic diagram of a first framework provided in an embodiment of the present application;

[0032] Figure 3 It is a schematic diagram of an exploded structure of a first frame provided in an embodiment of the present application;

[0033] Figure 4 is a schematic diagram of a rear view structure of a projection screen provided in an embodiment of the present application;

[0034] Figure 5 is a schematic diagram of an exploded structure of another projection screen provided in an embodiment of the present application;

[0035] Figure 6 It is a partial side view structural diagram of an intermediate frame provided in an embodiment of the present application;

[0036] Figure 7 This is a schematic diagram of the main structure of an intermediate frame provided in an embodiment of the present application;

[0037] Figure 8 is a schematic diagram of a rear view structure of another projection screen provided in an embodiment of the present application;

[0038] Fig. 9 is a schematic diagram of the structure of a projection screen after contraction provided by an embodiment of the present application;

[0039] Fig.10 is a schematic diagram of a rear view structure of another projection screen provided in an embodiment of the present application;

[0040] Fig.11 It is a structural schematic diagram of a flexible curtain provided in an embodiment of the present application;

[0041] Fig.12 It is a structural schematic diagram of a type of support rod provided in an embodiment of the present application;

[0042] Fig.13 This is a schematic diagram of a structure in which a tensioning member tightens a flexible curtain provided in an embodiment of the present application;

[0043] Fig.14 This is a schematic diagram of the structure of another tensioning member provided in an embodiment of the present application for tightening a flexible curtain;

[0044] Fig.15 This is a schematic diagram of the structure of another tensioning member tensioning a flexible curtain provided in an embodiment of the present application.

[0045] Reference numerals:

[0046] 1: first frame; 2: second frame; 3: middle frame; 4: connecting piece; 5: flexible curtain; 6: tensioning mechanism;

[0047] 11: upper frame; 12: lower frame; 13: side frame; 14: angle iron; 15: vertical beam;

[0048] 21: slideway; 211: limiting hole;

[0049] 31: fifth limiting slot;

[0050] 41: guide rod; 411: limit marble; 42: connecting plate;

[0051] 51: receiving pocket; 52: notch; 53: curtain piece; 54: flexible carrier;

[0052] 61: support rod; 62: tension member;

[0053] 611: first type support rod; 612: second type support rod; 613: third type support rod;

[0054] 621: tension spring; 622: first clamping strip; 623: limit rod; 624: tension rod; 625: second clamping strip; 626: adjustment screw. DETAILED DESCRIPTION

[0055] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0056] Figure 1 The structural schematic diagram of a projection screen according to an embodiment of the present application is illustrated. Figure 1 As shown, the projection screen includes: a first frame 1, a second frame 2, an intermediate frame 3, a connecting member 4, a flexible curtain 5 and a tensioning mechanism 6; the intermediate frame 3 is detachably fixedly connected between the first frame 1 and the second frame 2 through the connecting member 4 to form a rectangular frame; the flexible curtain 5 is attached to the front side of the rectangular frame, and the edge of the flexible curtain 5 is folded to wrap the edge of the rectangular frame; the tensioning mechanism 6 is used to tighten the edge of the flexible curtain 5 to the back side of the rectangular frame.

[0057] In the embodiment of the present application, the middle frame 3 is spliced ​​between the first frame 1 and the second frame 2, and the middle frame 3 is fixedly connected to the first frame 1 and the second frame 2 through the connecting member 4. Then, by tightening the edge of the flexible curtain 5 by the tightening mechanism 6, the flatness of the flexible curtain 5 can be ensured, thereby ensuring the normal use of the projection screen; and when the transportation of the projection screen is restricted, the connecting member 4 is disassembled to disassemble the connection between the middle frame 3 and the first frame 1 and the second frame 2, and then the middle frame 3 is taken out from between the first frame 1 and the second frame 2. At this time, there is a certain gap between the first frame 1 and the second frame 2, and they are connected by the flexible curtain 5. In this way, the space occupied by the projection screen can be reduced by bending the flexible curtain 5, thereby ensuring the normal transportation of the projection screen.

[0058] The bending of the flexible curtain 5 refers to the bending generated when the first frame 1 and the second frame 2 are folded in half, or the bending generated when the first frame 1 and the second frame 2 are pushed closer to each other in the plane where the rectangular frame is located.

[0059] Next, the various components of the projection screen are introduced.

[0060] 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 , so only the structure of the first frame 1 will be explained below, and the structure of the second frame 2 can refer to the structure of the first frame 1 .

[0061] Alternatively, if Figure 2 or Figure 3 As shown, the first frame 1 includes an upper frame 11, a lower frame 12 and a side frame 13, and the two ends of the side frame 13 are fixedly connected to the first end of the upper frame 11 and the first end of the lower frame 12, respectively, 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 right-angled trapezoidal.

[0062] Among them, for the right-angle U-shaped frame, the second end of the upper frame 11 and the second end of the lower frame 12 are both detachably fixedly connected to the middle frame 3 through the connecting member 4. The length of the upper frame 11 and the length of the lower frame 12 can be the same, of course, or different, and this embodiment of the application does not limit this.

[0063] When the side frame 13 is fixedly connected to the upper frame 11 and the lower frame 12 respectively, optionally, the first end of the side frame 13 has a first card groove, the first end of the upper frame 11 has a first protrusion, the first protrusion is limited in the first card groove, so that the side frame 13 and the upper frame 11 are fixedly connected, the second end of the side frame 13 has a second card groove, the first end of the lower frame 12 has a second protrusion, the second protrusion is limited in the second card groove, so that the side frame 13 and the lower frame 12 are fixedly connected.

[0064] Among them, the positions of the first slot and the first protrusion, and the second slot and the second protrusion can also be swapped, as long as the two ends of the side frame 13 can be correspondingly fixedly connected with the first end of the upper frame 11 and the first end of the lower frame 12 respectively, and the embodiments of the present application are not limited to this.

[0065] Of course, in addition to the above-mentioned grooves and protrusions to achieve the fixed connection between the side frame 13 and the upper frame 11 and the lower frame 12, other methods can also be used to achieve the fixed connection between the side frame 13 and the upper frame 11 and the lower frame 12. For example, Figure 2 or Figure 3 As shown, the first frame 1 further includes an angle iron 14, and the side frame 13 and the upper frame 11, as well as the side frame 13 and the lower frame 12 are fixedly connected by the angle iron 14. That is, the first end of the side frame 13 and the first end of the upper frame 11, as well as the second end of the side frame 13 and the first end of the lower frame 12 are fixedly connected by the angle iron 14.

[0066] Among them, the angle iron 14 is a planar structure, and the corner edge of the angle iron 14 has a threaded hole. The end 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, so that the fixing screws can be passed through the through holes and screwed into the corresponding threaded holes to achieve the fixed connection between the side frame 13, the upper frame 11 and the lower frame 12 and the corner edge of the angle iron 14 respectively, and then achieve the fixed connection between the side frame 13 and the upper frame 11 and the lower frame 12 respectively.

[0067] In addition, for the right-angle U-shaped frame, when the first frame 1 is not connected to the middle frame 3, the second end of the upper frame 11 and the second end of the lower frame 12 included in the first frame 1 are in a suspended state, which can easily cause the first frame 1 to deform under the action of external force. Figure 2 or Figure 3 As shown, the first frame 1 further includes a vertical beam 15, and the two ends of the vertical beam 15 are respectively fixedly connected to the upper frame 11 and the lower frame 12. In this way, the vertical beam 15 can support the upper frame 11 and the lower frame 12, avoiding the possibility of deformation of the first frame 1.

[0068] Optionally, two ends of the vertical beam 15 are fixedly connected to the second end of the upper frame 11 and the second end of the lower frame 12 , respectively, so as to provide better support for the upper frame 11 and the lower frame 12 .

[0069] In the embodiment of the present application, the middle frame 3 includes a first frame and a second frame, the first frame and the second frame are parallel, and the first frame and the second frame are both detachably fixedly connected between the first frame 1 and the second frame 2 through a connecting member 4.

[0070] Combined with the above explanation of the first frame 1 and the second frame 2, the first frame is clamped between the upper frame 11 included in the first frame 1 and the upper frame 11 included in the second frame 2, and is detachably fixedly connected by a corresponding connecting member 4; the second frame is clamped between the lower frame 12 included in the first frame 1 and the lower frame 12 included in the second frame 2, and is detachably fixedly connected by a corresponding connecting member 4.

[0071] Among them, the length of the first frame and the length of the second frame can be the same, of course, they can also be different, as long as the first frame and the second frame are fixedly connected between the first frame 1 and the second frame 2 to form a rectangular frame, the embodiment of the present application does not limit this.

[0072] It should be noted that, when the middle frame 3 includes a first frame and a second frame, the first frame and the second frame are independently clamped between the first frame 1 and the second frame 2. Therefore, after disassembling the middle frame 3, the first frame and the second frame can be taken out separately to achieve the removal of the middle frame 3.

[0073] Optionally, since the edge of the flexible curtain 5 wraps the edge of the rectangular frame, that is, the edge of the flexible curtain 5 wraps one side of the first frame and one side of the second frame, at this time, the first frame can be pushed to move in the direction of the second frame under the action of an external force to cause the first frame to break away from the wrapping of the edge of the flexible curtain 5, thereby removing the first frame; similarly, the second frame can be pushed to move in the direction of the first frame under the action of an external force to cause the second frame to break away from the wrapping of the edge of the flexible curtain 5, thereby removing the second frame.

[0074] Of course, in addition to taking out the first frame and the second frame in the above-mentioned manner, the first frame and the second frame can also be taken out in other ways. For example, the edge of the flexible curtain 5 corresponding to the positions of the two ends of the first frame and the positions corresponding to the two ends of the second frame have notches 52, so that the user can connect the edge of the flexible curtain 5 at the corresponding positions of the first frame and the second frame, and then the first frame and the second frame can be directly taken out.

[0075] Among them, the edge of the flexible curtain 5 at the corresponding position of the first frame is tightened on the back of the first frame through the tightening mechanism 6, and the edge of the flexible curtain 5 at the corresponding position of the second frame is tightened on the back of the second frame through the tightening mechanism 6 to ensure that the flexible curtain 5 is in a tensioned state as a whole, thereby ensuring the flatness of the flexible curtain 5.

[0076] Furthermore, the middle frame 3 further comprises a vertical beam 15, and the two ends of the vertical beam 15 are respectively fixedly connected to the first frame and the second frame. In this way, the number of parts is reduced by connecting the vertical beam 15 with the first frame and the second frame, thereby ensuring the integrity of the middle frame 3.

[0077] It should be noted that, in the case where the middle frame 3 includes a vertical beam 15, the first side frame, the second side frame and the vertical beam 15 are clamped as a whole between the first frame 1 and the second frame 2, and thus the first side frame, the second side frame and the vertical beam 15 need to be taken out as a whole to realize the removal of the middle frame 3.

[0078] Among them, Figure 4 As shown, the edge of the flexible curtain 5 corresponds to the joint seam of the first frame 1 and the middle frame 3, and the position of the joint seam of the second frame 2 and the middle frame 3 has a notch 52, that is, the edge of the flexible curtain 5 corresponds to the positions at both ends of the first frame, and the positions corresponding to both ends of the second frame have a notch 52, so that the user can connect the edge of the flexible curtain 5 at the corresponding position of the first frame and the second frame. At this time, the first frame, the second frame and the vertical beam 15 can be taken out along the thickness direction of the rectangular frame.

[0079] Among them, the edge of the flexible curtain 5 at the corresponding position of the first frame is tightened on the back of the first frame through the tightening mechanism 6, and the edge of the flexible curtain 5 at the corresponding position of the second frame is tightened on the back of the second frame through the tightening mechanism 6 to ensure that the flexible curtain 5 is in a tensioned state as a whole, thereby ensuring the flatness of the flexible curtain 5.

[0080] In the embodiment of the present application, the middle frame 3 is directly and detachably fixedly connected to the first frame 1 and the second frame 2 through the connecting member 4, or is indirectly and detachably fixedly connected to the first frame 1 and the second frame 2 through the connecting member 4.

[0081] When the intermediate frame 3 is directly fixedly connected to the first frame 1 and the second frame 2, the connecting member 4 is a fixing member such as a fixing screw. When the intermediate frame 3 is indirectly fixedly connected to the first frame 1 and the second frame 2, in some embodiments, such as Figure 5 As shown, the connecting member 4 is a connecting plate 42, which is fixed on the middle frame 3, and both ends of the connecting plate 42 extend out of the middle frame 3; the first frame 1 has a second limiting groove, and the second frame 2 has a third limiting groove, and the two ends of the connecting plate 42 are respectively limited in the second limiting groove and the third limiting groove, and the two ends of the connecting plate 42 are respectively detachably fixedly connected to the first frame 1 and the second frame 2.

[0082] In this way, through the limiting effect of the two ends of the connecting plate 42 in the second limiting groove and the third limiting groove, the middle frame 3, the first frame 1 and the second frame 2 can be ensured to be at the same height, avoiding the appearance of steps at the edge of the rectangular frame formed after the connection, thereby avoiding the phenomenon of wrinkles when the flexible curtain 5 is tightened. In addition, after the connecting plate 42 is fixedly connected to the first frame 1 and the second frame 2 respectively, the middle frame 3, the first frame 1 and the second frame 2 can all fit with the connecting plate 42, so that the connecting plate 42 can ensure the flatness of the rectangular frame formed after the fixed connection, thereby ensuring the flatness of the flexible curtain 5.

[0083] Optionally, the connecting plate 42 is pressed on the flexible curtain 5, and then fixedly connected to the middle frame 3, the first frame 1 and the second frame 2 respectively. At this time, the edge of the flexible curtain 5 at the corresponding position of the middle frame 3 can be pressed against the back of the middle frame 3 by the connecting plate 42, so that the tensioning mechanism 6 is not required to tighten. In this way, when disassembling the middle frame 3, the middle frame 3 can be disassembled by directly disassembling the connecting plate 42.

[0084] Optionally, the connecting plate 42 is directly attached to the middle frame 3, the first frame 1 and the second frame 2, and then fixedly connected to the middle frame 3, the first frame 1 and the second frame 2. At this time, the edge of the flexible curtain 5 corresponding to the joint seam between the first frame 1 and the middle frame 3, and the joint seam between the second frame 2 and the middle frame 3 are provided with notches 52, so that it is convenient for the user to pick up the edge of the flexible curtain 5 at the corresponding position of the middle frame 3, so as to disassemble the connection between the connecting plate 42 and the first frame 1 and the second frame 2, and realize the disassembly of the middle frame 3.

[0085] In addition, the edge of the flexible curtain 5 at the corresponding position of the middle frame 3 is tightened on the back of the rectangular frame through the tightening mechanism 6, that is, the tightening mechanism 6 is connected between the edge of the flexible curtain 5 and the middle frame 3 to achieve the tightening of the edge of the flexible curtain 5 at the corresponding position of the middle frame 3, thereby ensuring the overall tightening of the flexible curtain 5. In order to facilitate the connection of the edge of the flexible curtain 5 at the corresponding position of the middle frame 3, the tightening mechanism 6 connected to the edge of the flexible curtain 5 at the corresponding position of the middle frame 3 is detachable.

[0086] Among them, Figure 6 and Figure 7 As shown, the middle frame 3 has a fifth limiting groove 31, and the connecting plate 42 is fixed in the fifth limiting groove 31, so as to ensure the flatness of the rectangular frame formed after the connecting plate 42 is respectively fixedly connected to the first frame 1 and the second frame 2. Of course, in order to facilitate operation and reduce assembly errors, the connecting plate 42 and the middle frame 3 are an integrated structure, so as to reduce the number of parts of the projection screen and the workload when installing the middle frame 3.

[0087] In other embodiments, Figure 8 As shown, the connecting member 4 is a guide rod 41, the first end of the guide rod 41 is fixedly connected to the first frame 1, the second frame 2 has a slide 21, the second end of the guide rod 41 is located in the slide 21, and the second frame 2 can slide along the guide rod 41; the middle frame 3 has a first limiting groove, the middle frame 3 is limited on the guide rod 41 by the first limiting groove, and is detachably fixedly connected to the guide rod 41.

[0088] In this way, Fig. 9As shown, with the cooperation of the guide rod 41 and the slide 21, it is easy to promote the first frame 1 and the second frame 2 to approach each other, and at the same time, the direction in which the first frame 1 and the second frame 2 approach each other can be limited, so that the flexible curtain 5 can only bend in its own length direction to reduce the number of bending directions of the flexible curtain 5. In addition, by limiting the guide rod 41 in the first limiting groove, it can be ensured that the middle frame 3, the first frame 1 and the second frame 2 are at the same height, avoiding the appearance of steps on the edge of the rectangular frame formed after the connection, thereby avoiding the phenomenon of wrinkles when the flexible curtain 5 is tightened. In addition, after the middle frame is fixedly connected to the guide rod 41, the middle frame 3, the first frame 1 and the second frame 2 can all fit with the guide rod 41, so that the flatness of the rectangular frame formed after the fixed connection can be ensured by the guide rod 41, thereby ensuring the flatness of the flexible curtain 5.

[0089] Among them, since the guide rod 41 is directly connected between the first frame 1 and the second frame 2, the guide rod 41 is directly attached to the middle frame 3. At this time, in order to realize the disassembly of the guide rod 41 and the middle frame 3, the structure of the edge of the flexible curtain 5 and the tensioning mechanism 6 of the edge of the flexible curtain 5 can refer to the structure corresponding to the above-mentioned connection plate 42 attached to the middle frame 3, and the embodiment of the present application will not be repeated.

[0090] The inner wall of the slideway 21 has a first limiting structure, and the second end of the guide rod 41 has a second limiting structure, and the first limiting structure and the second limiting structure are used to cooperate to limit the second end of the guide rod 41. In this way, the cooperation of the first limiting structure and the second limiting structure can prevent the second end of the guide rod 41 from sliding out of the slideway 21, and at the same time ensure that after the second end of the guide rod 41 is limited, the gap between the first frame 1 and the second frame 2 is just suitable for installing the middle frame 3.

[0091] Alternatively, if Figure 8 As shown, the first limiting structure is a limiting hole 211, the second limiting structure is a limiting marble 411, the second end of the guide rod 41 has a blind hole, one end of the limiting marble 411 is fixed in the blind hole, and the other end of the limiting marble 411 protrudes from the blind hole and can be sunk in the blind hole under the action of an external force. In this way, when the second end of the guide rod 41 slides in the slideway 21, the limiting marble 411 can be sunk in the blind hole based on the squeezing of the limiting marble 411 by the inner wall of the slideway 21, and when the limiting marble 411 moves to the position corresponding to the limiting hole 211, the limiting marble 411 can pop out of the blind hole and get stuck in the limiting hole 211, so as to limit the second end of the guide rod 41. When it is necessary to reduce the space occupied by the projection screen, the middle frame 3 is disassembled and removed, and then the limiting marble 411 is pressed to cause the limiting marble 411 to sink in the blind hole, thereby causing the first frame 1 and the second frame 2 to approach each other.

[0092] Among them, after the first frame 1 and the second frame 2 are close to each other, in order to avoid relative movement between the first frame 1 and the second frame 2, a third limiting mechanism may be further provided on the inner wall of the slideway 21, and a fourth limiting structure may be further provided on the guide rod 41, and then the third limiting structure and the fourth limiting structure cooperate to achieve the limiting of the guide rod 41 in the slideway 21, and then achieve the relative limiting of the first frame 1 and the second frame 2. The specific composition of the third limiting structure and the fourth limiting structure may refer to the first limiting structure and the second limiting structure, and the embodiment of the present application does not limit this.

[0093] It should be noted that after the middle frame 3 is spliced ​​between the first frame 1 and the second frame 2, in order to ensure the close contact between the middle frame 3 and the first frame 1 and the second frame 2, at this time, the limiting hole 211 is an oblong hole, and the limiting marble 411 can slide in the oblong hole. Correspondingly, the second end of the guide rod 41 can slide in the slideway 21, thereby adjusting the distance between the first frame 1 and the second frame 2. At the same time, after the middle frame 3 is clamped between the first frame 1 and the second frame 2, in order to ensure the tension of the flexible curtain 5, a tensioning mechanism 6 that can adjust the tension of the flexible curtain 5 can be selected in the length direction of the rectangular frame. That is, in combination with the structure of the first frame 1, the tensioning mechanism 6 that can adjust the tension of the flexible curtain 5 is selected to be connected to the side frame 13 position of the first frame 1, or to the side frame 13 position of the first frame 1 and the side frame 13 position of the second frame 2. Among them, the tensioning mechanism 6 that can adjust the tension of the flexible curtain 5 is explained below.

[0094] In the embodiment of the present application, in addition to the above two methods to achieve the detachable fixed connection between the middle frame 3 and the first frame 1 and the second frame 2, the above two methods can also be appropriately combined to achieve the detachable connection between the middle frame 3 and the first frame 1 and the second frame 2, while facilitating the reduction of the space occupied by the projection screen. For example, Fig.10 As shown, the connecting member 4 is a connecting plate 42, and the middle frame 3 is detachably fixedly connected to the first frame 1 and the second frame 2 through the connecting plate 42, and the first frame 1 and the second frame 2 are slidably connected through the guide rod 41. That is, the connecting plate 42 has all the functions described in the first mode, and the guide rod 41 has the function of facilitating the first frame 1 and the second frame 2 to approach each other as described in the second mode.

[0095] In the present application embodiment, Fig.11As shown, the flexible curtain 5 includes a curtain piece 53 and a flexible carrier 54, the curtain piece 53 is fixed to a first side of the flexible carrier 54, and the edge of the flexible carrier 54 extends out of the four side edges of the curtain piece 53; the second side of the flexible carrier 54 is attached to the front side of the rectangular frame, and the edge of the flexible carrier 54 is folded to wrap the edge of the rectangular frame, and the tensioning mechanism 6 is used to tighten the edge of the flexible carrier 54 to the back side of the rectangular frame.

[0096] The screen 53 is an optical film, which is used in conjunction with the projection host. The projection host is used to emit a light beam to the optical film, and the optical film is used to receive and reflect the light beam to display the image. The screen 53 can be fixed on the flexible carrier 54 by bonding.

[0097] The flexible carrier 54 may be a flexible cloth, or other flexible parts, as long as it can be bent arbitrarily and has a certain flatness after being stretched. This embodiment of the present application does not limit this.

[0098] The projection of the flexible carrier 54 on the plane where the screen piece 53 is located covers the screen piece 53 or covers the four sides of the screen piece 53 to ensure that the edge of the flexible carrier 54 extends out of the four sides of the screen piece 53, thereby ensuring the flatness of the screen piece 53 while the flexible carrier 54 is tightened.

[0099] When the projection of the flexible carrier 54 on the plane where the screen piece 53 is located covers the screen piece 53, the flexible carrier 54 is circular or rectangular, etc., and when the projection of the flexible carrier 54 on the plane where the screen piece 53 is located covers the four sides of the screen piece 53, the flexible carrier 54 is in a round shape. Of course, in addition to being circular, rectangular, and round, the flexible carrier 54 can also be other rectangular shapes, as long as the edges of the flexible carrier 54 extend out of the four sides of the screen after the screen piece 53 is fixed on the flexible carrier 54, and the extended part can be bent to the back of the rectangular frame. The application embodiment itself does not limit this.

[0100] In some embodiments, the tensioning mechanism 6 includes a tensioning member 62 , one end of which is directly connected to the edge of the flexible curtain 5 , and the other end of which is connected to the back of the rectangular frame to tighten the edge of the flexible curtain 5 .

[0101] Optionally, the tensioning member 62 is a tension spring 621 . Of course, the tensioning member 62 may also be other structures, which is not limited in the embodiment of the present application.

[0102] In other embodiments, Fig.10As 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 (not shown), and the receiving pockets 51 at corresponding positions of the first frame 1, the second frame 2 and the middle frame 3 all have support rods 61; 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.

[0103] In this way, the edge of the flexible curtain 5 is supported as a whole by the support rod 61, and then the support rod 61 is tightened by the tensioning member 62, so that the edge of the flexible curtain 5 is tightened as a whole by the tensioning member 62, thereby ensuring the uniformity of the tightening of the flexible curtain 5 and avoiding the phenomenon of wrinkles in the flexible curtain 5 due to large local tension.

[0104] The number of types of support rods 61 and the length of each type of support rods 61 can be set according to the length of the frames included in the first frame 1, the second frame 2 and the middle frame 3. For example, Fig.12 As shown, the first frame 1 and the second frame 2 are both the same U-shaped frames, and the side frame 13 of the first frame 1 corresponds 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 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, and the first frame and the second frame of the middle frame 3 correspond to the third type of support rod 613, and the length of the third type of support rod 613 is equal to the length of the first frame.

[0105] Alternatively, if Fig.13 As shown, the tensioning 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 frame corresponding to the support rod 61 through a hook.

[0106] The flexible curtain 5 has a second through hole, and 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 has a hanging groove, and the hook at the second end of the tension spring 621 is hung on the hanging groove.

[0107] Alternatively, if Fig.14 As shown, the tensioning member 62 includes a first clamping strip 622, a limiting rod 623 and a tensioning rod 624; the first end of the first clamping strip 622 is connected to the support rod 61, the second end of the first clamping strip 622 has a fourth limiting groove, and the first end of the limiting rod 623 can be rotatably limited in the fourth limiting groove; the first end of the tensioning rod 624 is rotatably connected to the frame corresponding to the support rod 61, and the middle part of the tensioning rod 624 is rotatably connected to the second end of the limiting rod 623.

[0108] In this way, when the tensioning rod 624 is caused to rotate in the direction away from the support rod 61 under the action of external force, the tensioning rod 624 drives the second end of the limiting rod 623 to move in the direction away from the support rod 61, and then drives the first clamping strip 622 to move through the limiting rod 623 to achieve the tightening of the support rod 61.

[0109] Among them, when the tensioning rod 624 rotates to the first end of the limiting rod 623, the first end of the tensioning rod 624 and the second end of the limiting rod 623 are located in the same straight line, the reverse force of the flexible curtain 5 on the limiting rod 623 acts on the rotation axis of the limiting rod 623 and the rotation axis of the tensioning rod 624, thereby achieving the limitation of the tensioning rod 624.

[0110] Of course, the tension rod 624 can also be limited by a limit pin. For example, the tension member 62 also includes a limit pin, the limit rod 623 has a first limit hole, the tension rod 624 has a second limit hole, and the limit pin is used to extend into the first limit hole and the second limit hole. Further, the limit rod 623 has a row of first limit holes in the extension direction, and the limit pin can be inserted into different first limit holes, so as to adjust the tension of the tension member 62 on the support rod 61.

[0111] In some embodiments, the first end of the first clamping 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 clamping strip 622 can be slid from the end of the support rod 61 to be limited on the support rod 61, and the position of the first clamping strip 622 in the length direction of the support rod 61 can be adjusted at the same time.

[0112] The opening size of the receiving groove is smaller than the diameter of the support rod 61, so as to limit the support rod 61 in the receiving groove. Of course, the support rod 61 can also be limited in the receiving groove by other methods, which is not limited in the embodiment of the present application.

[0113] 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, so that the opening side of the receiving groove will inevitably be in contact with the flexible curtain 5. Therefore, the opening side of the receiving groove has a flexible pad to prevent the opening side of the receiving groove from scratching the flexible curtain 5, thereby preventing the flexible curtain 5 from being damaged.

[0114] In other embodiments, the first end of the first clip 622 has a hook, the flexible curtain 5 has a second through hole, and the hook passes through the second through hole to be hung on the rod body. In this way, the second through hole can be set at the position where the flexible curtain 5 needs to be tightened, and then the hook of the first clip 622 passes through the second through hole to be hung on the support rod 61.

[0115] Alternatively, if Fig.15As shown, the tensioning member 62 includes a second clamping strip 625 and an adjusting screw 626; the first end of the second clamping strip 625 is connected to the support rod 61, and the frame corresponding to the support rod 61 has a first through hole, and the adjusting screw 626 passes through the first through hole and is threadedly connected to the second end of the second clamping strip 625.

[0116] Among them, the end of the adjusting screw 626 that is not connected to the second clamping strip 625 is limited at the other side of the first through hole. In this way, the adjusting screw 626 can be rotated relative to the second clamping strip 625 to adjust the length of the tensioning member 62, thereby adjusting the tension of the support rod 61 and adjusting the tension of the flexible curtain 5. The structure of the first end of the second clamping strip 625 is the same or similar to the structure of the first end of the first clamping strip 622, and of course it can be different, as long as it can achieve connection with the support rod 61, and the embodiment of the present application does not limit this.

[0117] A description is required. The above introduction to the tensioning member 62 is based on the fact that the tensioning mechanism 6 composed of the first structure and the support rod 61 does not have the function of adjusting the tension of the flexible curtain 5. The tensioning mechanism 6 composed of the second structure or the third structure and the support rod 61 has the function of adjusting the tension of the flexible curtain 5.

[0118] It should also be noted that when the edge of the flexible curtain 5 is tightened by the tensioning mechanism 6, a tensioning member 62 of one structure can be selected to achieve the tightening of the edge of the flexible curtain 5. Of course, multiple structures of tensioning members 62 can also be selected to achieve the tightening of the edge of the flexible curtain 5. The embodiment of the present application is not limited to this.

[0119] In an embodiment of the present application, the middle frame is spliced ​​between the first frame and the second frame, and the middle frame is fixedly connected to the first frame and the second frame through a connecting piece. After that, when the tensioning mechanism tightens the edge of the flexible screen, the flatness of the flexible screen can be ensured, thereby ensuring the normal use of the projection screen. When the transportation of the projection screen is restricted, the connecting piece is disassembled to disassemble the connection between the middle frame and the first frame and the second frame, and then the middle frame is taken out from between the first frame and the second frame. At this time, there is a certain gap between the first frame and the second frame, and they are connected by the flexible screen. In this way, the space occupied by the projection screen can be reduced by bending the flexible screen, thereby ensuring the normal transportation of the projection screen.

[0120] The above description is only an illustrative embodiment of the embodiments of the present application and is not intended to limit the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should 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, an intermediate frame, a connecting piece, a flexible curtain and a tensioning mechanism; The middle frame is detachably fixedly connected between the first frame and the second frame through the connecting member to form a rectangular frame; The flexible curtain comprises a curtain piece and a flexible carrier, wherein the curtain piece is fixed on one side of the flexible carrier, and the edge of the flexible carrier extends out of four side edges of the curtain piece; the flexible carrier is attached to the front side of the rectangular frame, and the edge of the flexible carrier is folded to wrap the edge of the rectangular frame; The tensioning mechanism is used to tighten the edge of the flexible carrier on the back side of the rectangular frame; Wherein, the tensioning mechanism comprises a support rod and a tensioning member; The edge of the flexible curtain has a receiving pocket, and the receiving pockets at corresponding positions of the first frame, the second frame and the middle frame all have 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 fourth limiting groove, and the first end of the limiting rod can be rotatably limited in the fourth 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 connecting piece is a guide rod; The first end of the guide rod is fixedly connected to the first frame, the second frame has a slideway, the second end of the guide rod is located in the slideway, and the second frame can slide along the guide rod; The middle frame has a first limiting groove, and the middle frame is limited on the guide rod through the first limiting groove, and is detachably fixedly connected to the guide rod.

3. The projection screen according to claim 2, characterized in that: The inner wall of the slideway has a first limiting structure, and the second end of the guide rod has a second limiting structure, and the first limiting structure and the second limiting structure are used to cooperate to limit the second end of the guide rod.

4. The projection screen according to claim 1, characterized in that: The connecting member is a connecting plate, which is fixed on the middle frame, and both ends of the connecting plate extend out of the middle frame; The first frame has a second limiting groove, the second frame has a third limiting groove, the two ends of the connecting plate are respectively limited in the second limiting groove and the third limiting groove, and the two ends of the connecting plate are respectively detachably fixedly connected to the first frame and the second frame.

5. The projection screen according to claim 4, characterized in that: The connecting plate and the middle frame are an integrated structure.

6. The projection screen according to any one of claims 1 to 5, characterized in that: The middle frame includes a first frame and a second frame; The first frame is parallel to the second frame, and the first frame and the second frame are both detachably fixedly connected between the first frame and the second frame via the connecting member.

7. The projection screen according to claim 6, characterized in that The middle frame further comprises a vertical beam, and two ends of the vertical beam are respectively fixedly connected to the first frame and the second frame; The edge of the flexible curtain has notches at positions corresponding to the joint seams between the first frame and the middle frame, and at positions corresponding to the joint seams between the second frame and the middle frame.

8. The projection screen according to claim 1, characterized in that: The tensioning member further comprises a limiting pin, the limiting rod comprises a first limiting hole, the tensioning rod comprises a second limiting hole, and the limiting pin is used to extend into the first limiting hole and the second limiting hole.

Images