CN115236930A

CN115236930A - Projection screen

Info

Publication number: CN115236930A
Application number: CN202210921204.3A
Authority: CN
Inventors: 代琪
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2022-08-02
Filing date: 2022-08-02
Publication date: 2022-10-25

Abstract

The application discloses projection screen belongs to projection technical field. The projection screen includes: two sets of support frame, curtain piece, mounting and two tensioning assembly that set up relatively. When the rectangular frame is fixed on the back of the curtain sheet, the two tensioning assemblies are fixed on the back of the curtain sheet, the rotating piece in each tensioning assembly rotates to drive the connecting rod in the tensioning assembly where the rotating piece is located to move, and then the tension of the curtain sheet in the short side direction of the rectangular frame and/or the long side direction of the rectangular frame is adjusted. Because two connecting rods in each tensioning assembly are connected with a group of two oppositely arranged supporting frames in the rectangular frame, each tensioning assembly can drive the two oppositely arranged supporting frames to move oppositely. Therefore, the two tensioning assemblies can stretch the curtain sheet in the short side direction and/or the long side direction of the rectangular frame. So, can effectual regulation curtain's roughness, and then make the display effect of the picture that the curtain presented better.

Description

Projection screen

Technical Field

The application relates to the technical field of projection, in particular to a projection screen.

Background

With the continuous development of science and technology, projection devices are increasingly applied to the work and life of consumers. At present, a projection device mainly comprises a projection host and a projection screen. The light outlet of the projection host faces the projection screen to emit light beams to the projection screen, and the projection screen is used for receiving the light beams to realize image display.

Currently, projection screens mainly include a rectangular frame and a flexible curtain. The rectangular frame is attached to the back face of the flexible curtain, and the edge of the flexible curtain is folded to wrap the edge of the rectangular frame, so that the rectangular frame can support the flexible curtain.

However, the flexible curtain is prone to edge curl and bulge during use, which results in poor display effect of the picture displayed on the projection screen.

Disclosure of Invention

The embodiment of the application provides a projection screen. The problem of poor display effect of pictures presented by a projection screen in the prior art can be solved, and the technical scheme is as follows:

in one aspect, a projection screen is provided, the projection screen comprising:

the two groups of oppositely arranged supporting frames are movably connected end to end in sequence to form a rectangular frame;

the curtain sheet is connected with the rectangular frame;

the fixing piece is positioned on the back surface of the curtain sheet and is provided with an accommodating cavity;

and at least part is located the holding intracavity and with two tensioning set spare that the mounting is connected, two tensioning set spares subassemblies with two sets of support frames one-to-one that set up relatively, every tensioning set spare includes: the device comprises a rotating piece and two connecting rods, wherein one ends of the two connecting rods are respectively connected with two supporting frames in a corresponding group of oppositely arranged supporting frames, and the other ends of the two connecting rods are abutted against the rotating piece;

wherein the two rotating members in the two tensioning assemblies are capable of relative rotation therebetween, each of the rotating members being configured to: when the rotating piece rotates, the two connecting rods in the tensioning assembly where the rotating piece is located are driven to move in the length direction of the connecting rods.

The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:

a projection screen, may comprise: two sets of support frame, curtain piece, mounting and two tensioning assembly that set up relatively. When fixing rectangular frame at the back of curtain, can all fix two tensioning assembly at the back of curtain, the rotation through the rotation of the rotation piece in every tensioning assembly is in order to drive the removal of the connecting rod in the tensioning assembly that the rotation piece is located, and then adjusts the screen in the rate of tension on rectangular frame's minor face direction and/or rectangular frame's long limit direction. Because two connecting rods in each tensioning assembly are connected with a group of two oppositely arranged supporting frames in the rectangular frame, each tensioning assembly can drive the two oppositely arranged supporting frames to move oppositely. Therefore, the two tensioning assemblies can stretch the curtain sheet in the short side direction of the rectangular frame and/or the long side direction of the rectangular frame. So, can effectual regulation curtain's roughness, and then make the display effect of the picture that the curtain presented better.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a projection screen provided in an embodiment of the present application;

FIG. 2 is an exploded schematic view of the projection screen shown in FIG. 1;

FIG. 3 is a schematic illustration of a connection of a fastener and a tensioning assembly provided by an embodiment of the present application;

FIG. 4 is a front view of the projection screen configuration shown in FIG. 3;

fig. 5 is a schematic partial structural diagram of a projection screen provided in an embodiment of the present application;

FIG. 6 isbase:Sub>A cross-sectional view of the projection screen shown in FIG. 5 at A-A';

FIG. 7 is a cross-sectional view of the projection screen shown in FIG. 5 at B-B';

figure 8 is an exploded view of two rotating members according to an embodiment of the present application;

FIG. 9 is an illustration of the effect of using a tensioning assembly to tension a curtain in accordance with an embodiment of the present application;

FIG. 10 is an assembly view of an adjustment assembly and a tensioning assembly provided by an embodiment of the present application;

FIG. 11 is a schematic view of the structure of two rotating members provided in the embodiment of the present application;

FIG. 12 is a schematic structural diagram of an adjustment assembly provided in an embodiment of the present application;

FIG. 13 is an exploded view of an adjustment assembly according to an embodiment of the present application;

FIG. 14 is a diagram illustrating an assembly effect of an adjusting lever and a rotating member according to an embodiment of the present disclosure;

FIG. 15 is a schematic view of an assembly of the adjusting lever and the rotating member according to the embodiment of the present invention;

FIG. 16 is a schematic diagram of another projection screen according to an embodiment of the present disclosure;

FIG. 17 is an exploded view of the projection screen shown in FIG. 16;

FIG. 18 is a diagram illustrating the effect of using the fixing member, the support rod and the rotation connecting member to tension the curtain sheet according to the embodiment of the present application;

FIG. 19 is a schematic view of a support rod coupled to a support frame according to an embodiment of the present disclosure;

fig. 20 is a schematic partial structural diagram of a projection screen provided in an embodiment of the present application;

FIG. 21 is a schematic view of a rotary joint according to an embodiment of the present application;

FIG. 22 is an exploded view of the swivel connection shown in FIG. 21;

FIG. 23 is a schematic view of another embodiment of a rotational connection according to the present application;

FIG. 24 is a schematic view of a position limiter coupled to a rotational connector according to an embodiment of the present disclosure;

FIG. 25 is a schematic view of an alternative embodiment of a stop member coupled to a rotational connection member;

FIG. 26 is a schematic view of a support frame and corner block according to an embodiment of the present disclosure;

FIG. 27 is a schematic structural diagram of a corner block provided in an embodiment of the present application;

fig. 28 is a schematic structural diagram of another projection screen provided in the embodiment of the present application.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, the following detailed description of the embodiments of the present application will be made with reference to the accompanying drawings.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a projection screen according to an embodiment of the present disclosure, and fig. 2 is an exploded schematic diagram of the projection screen shown in fig. 1. The projection screen may include: two sets of oppositely disposed support borders 100, curtain sheets 200, anchors 300, and two tensioning assemblies 400.

Two sets of oppositely disposed support frames 100 in the projection screen may be movably connected end to end in sequence to form a rectangular frame. For example, the number of the two sets of oppositely disposed supporting frames 100 may be four, and the four supporting frames 100 are connected end to end in sequence to form a rectangular frame.

The curtain 200 in the projection screen 000 may be connected to a rectangular frame, i.e., the curtain 200 may be connected to the side of the support bezel 100. In this application, the curtain sheet 200 may be connected to the rectangular frame by bonding or by screwing, which is not limited in this application.

Referring to fig. 3 and 4, fig. 3 is a schematic diagram illustrating a connection between a fixing member and a tensioning assembly according to an embodiment of the present disclosure, and fig. 4 is a front view of the projection screen structure shown in fig. 3. The fixing member 300 in the projection screen 000 may be located on the back of the curtain sheet 200, and the fixing member 300 has a receiving cavity 301.

At least portions of two tensioning assemblies 400 in the projection screen may be located in the receiving cavity 301 in the fixture 300 and connected to the fixture 300. Two tensioning sets 400 may correspond one-to-one to two sets of oppositely disposed support rims 100, and each tensioning set 400 may include: the rotating part 401 and the two connecting rods 402, one end of each of the two connecting rods 402 can be respectively connected with the two supporting frames 100 in the corresponding set of supporting frames 100 which are oppositely arranged, and the other end of each of the two connecting rods 402 is abutted to the rotating part 401.

Wherein the two rotating members 401 in the two tensioning assemblies 400 can rotate relatively to each other, each rotating member 401 can be configured to: when the rotating member 401 rotates, the two connecting rods 402 in the tensioning assembly 400 where the rotating member 401 is located are both driven to move in the length direction of the connecting rods 402, so as to adjust the distance between a group of two oppositely arranged supporting frames 100 corresponding to the tensioning assembly 400. For example, the two oppositely disposed supporting frames 100 may be two long frames 100a or two short frames 100b.

In the embodiment of the present application, two connecting rods 402 in one tensioning assembly 400 may correspond to two long rims 100a one to one, and two connecting rods 402 in the other tensioning assembly 400 may correspond to two short rims 100b one to one. When two connecting rods 402 in a tensioning assembly are respectively connected with the long side frames 100a arranged oppositely, the rotating member 401 corresponding to the connecting rod 402 connected with the long side frames 100a arranged oppositely rotates to drive the connecting rod 402 connected with the long side frames 100a arranged oppositely to move in the length direction of the connecting rod 402 and simultaneously drive the two long side frames 100a arranged oppositely to move, so that the two long side frames 100a can drive the curtain sheet 200 to move in the short side direction of the rectangular frame (namely, the length direction of the short side frame 100 b), and further the tension of the curtain sheet 200 in the short side direction parallel to the rectangular frame can be adjusted. When two connecting rods 402 in another tensioning assembly are connected with the short frames 100b arranged oppositely, the rotating parts corresponding to the connecting rods connected with the short frames 100b arranged oppositely rotate to drive the two connecting rods 402 corresponding to the two short frames 100b arranged oppositely one by one to move in the length direction of the connecting rods 402 and simultaneously drive the two short frames 100b arranged oppositely to move, so that the two short frames 100b can drive the curtain sheet 200 to move in the long side direction of the rectangular frame (i.e. the length direction of the long frame 100 a), and further the tension of the curtain sheet 200 in the long side direction parallel to the rectangular frame can be adjusted. That is, the two tensioning assemblies 400 can be independently operated to individually adjust the tightness of the curtain sheet 200 in a direction parallel to the short sides of the rectangular frame or the tightness of the curtain sheet 200 in a direction parallel to the long sides of the rectangular frame. It is also possible to work with both tensioning assemblies 400 simultaneously to adjust the tension of the curtain sheet 200 in the direction parallel to the short sides of the rectangular frame and the tension of the curtain sheet 200 in the direction parallel to the long sides of the rectangular frame simultaneously.

For example, when securing a rectangular frame to the back of the curtain 200, both tensioning assemblies 400 may be secured to the back of the curtain 200. The rotation of the rotating member 401 in each tensioning assembly 400 drives the connecting rod 402 in the tensioning assembly 400 where this rotating member 401 is located to move, so as to adjust the tension of the curtain sheet 200 in the short side direction of the rectangular frame and/or the tension in the long side direction of the rectangular frame. Since the two connecting rods 402 in each tensioning assembly 400 are connected to a set of two oppositely disposed supporting rims 100 in the rectangular frame, each tensioning assembly 400 can drive the two oppositely disposed supporting rims 100 to move towards each other. Therefore, the two tensioning assemblies 400 can stretch the curtain sheet 200 in the short side direction of the rectangular frame and/or the long side direction of the rectangular frame. So, can effectual regulation curtain's roughness, and then make the display effect of the picture that the curtain presented better.

In summary, the embodiment of the present application provides a projection screen, which may include: two sets of support frame, curtain piece, mounting and two tensioning assembly that set up relatively. When fixing rectangular frame at the back of curtain, can all fix two tensioning assembly at the back of curtain, the rotation through the rotation of the rotation piece in every tensioning assembly is in order to drive the removal of the connecting rod in the tensioning assembly that the rotation piece is located, and then adjusts the screen in the rate of tension on rectangular frame's minor face direction and/or rectangular frame's long limit direction. Because two connecting rods in each tensioning assembly are connected with a group of two oppositely arranged supporting frames in the rectangular frame, each tensioning assembly can drive the two oppositely arranged supporting frames to move oppositely. Therefore, the two tensioning assemblies can stretch the curtain sheet in the short side direction of the rectangular frame and/or the long side direction of the rectangular frame. So, can effectual regulation curtain's roughness, and then make the display effect of the picture that the curtain presented better.

Optionally, please refer to fig. 5, fig. 6 and fig. 7, in which fig. 5 isbase:Sub>A schematic partial structure diagram ofbase:Sub>A projection screen provided in an embodiment of the present application, fig. 6 isbase:Sub>A sectional view of the projection screen shown in fig. 5 atbase:Sub>A-base:Sub>A ', and fig. 7 isbase:Sub>A sectional view of the projection screen shown in fig. 5 at B-B'. The two rotation members 401 in the two tensioning assemblies 400 in the projection screen may be: a first rotating member 401a and a second rotating member 401b. A side of the first rotating member 401a facing the second rotating member 401b may have a first movable connecting member 4011, and a side of the second rotating member 401b facing the first rotating member 401a may have a second movable connecting member 4012 rotatably connected to the first movable connecting member 4011. The first rotating member 401a may have a third movable connecting part 4013 on a side facing away from the second rotating member 401b, and the inner wall of the accommodating cavity 301 in the fixed member 300 may have a fourth movable connecting part 302 rotatably connected to the third movable connecting part 4013 on a side facing the first rotating member 401 a. The second rotating member 401b may have a fifth movable connecting part 4014 on a side facing away from the first rotating member 401a, and the inner wall of the accommodating cavity 301 of the fixed member 300 facing the second rotating member 401b may have a sixth movable connecting part 303 rotatably connected to the fifth movable connecting part 4014. In this case, first, the first rotating member 401a and the fixed member 300 can restrict the first rotating member 401a in the axial direction thereof while the first rotating member 401a rotates with respect to the fixed member 300 by the rotational connection of the third movable joint 4013 with the fourth movable joint 302. Then, the first rotating member 401a and the second rotating member 401b can be relatively rotated with respect to the first rotating member 401a and the second rotating member 401b by the rotational connection of the first movable connecting member 4011 and the second movable connecting member 4012, and at the same time, the first rotating member 401a and the second rotating member 401b are restricted in the axial direction thereof. Finally, the second rotating member 401b and the fixed member 300 can be rotatably connected by the fifth movable connecting member 4014 and the sixth movable connecting member 303 to limit the second rotating member 401b in the axial direction thereof while the second rotating member 401b rotates relative to the fixed member 300.

It should be noted that the first rotating member 401a may be disposed close to the curtain 200 in the projection screen relative to the second rotating member 401b, and one end of the two connecting rods 402 connected to the first rotating member 401a may be connected to the two long frames 100a disposed opposite in the rectangular frame, and one end of the two connecting rods 402 connected to the second rotating member 401b may be connected to the two short frames 100b disposed opposite in the rectangular frame; alternatively, one end of each of the two connecting rods 402 connected to the first rotating member 401a may be connected to two short side frames 100b oppositely disposed in the rectangular frame, and one end of each of the two connecting rods 402 connected to the second rotating member 401b may be connected to two long side frames 100a oppositely disposed in the rectangular frame, which is not limited in this embodiment of the present invention. In addition, in the following embodiments, the first ends of the two connecting rods 402 connected to the first rotating member 401a are connected to the two long side frames 100a of the rectangular frame, and the second ends of the two connecting rods 402 connected to the second rotating member 401b are connected to the two short side frames 100b of the rectangular frame.

In this application, one of the first movable connecting piece 4011 and the second movable connecting piece 4012 may be an annular boss, and the other may be an annular groove. One of the third movable connecting piece 4013 and the fourth movable connecting piece 302 may be a circular groove, and the other may be a circular boss; or the third movable connecting piece 4013 and the fourth movable connecting piece 302 may be both circular ring bosses, and the inner diameter of one circular ring boss is larger than the outer diameter of the other circular ring boss. One of the fifth movable connecting piece 4014 and the sixth movable connecting piece 303 can be a circular groove, and the other can be a circular boss; or the fifth movable connecting piece 4014 and the sixth movable connecting piece 303 may be both circular ring bosses, and the inner diameter of one circular ring boss is larger than the outer diameter of the other circular ring boss. For example, referring to fig. 7 and 8, fig. 8 is an exploded schematic view of two rotating members according to an embodiment of the present application. First movable connecting piece 4011 is the ring boss, and second movable connecting piece 4012 is the ring groove, and the ring boss can cup joint in the ring groove. The third movable connecting piece 4013 is a circular groove, and the fifth movable connecting piece 4014 is a circular boss. The fourth movable connecting piece is a 302-ring boss, and the sixth movable connecting piece 303 is a ring boss, which is not specifically limited in the embodiment of the present application, and it is sufficient to rotate the rotating piece 401.

In the present embodiment, as shown in fig. 5, each rotating member 401 may have at least two protrusions 4015, two protrusions 4015 of the at least two protrusions 4015 may correspond one-to-one to two connecting rods 402 in the tensioning assembly 400 in which the rotating member 401 is located, and each protrusion 4015 may abut against an end of the corresponding connecting rod 402. Wherein each turn piece 401 may be configured to: when the rotation member 401 rotates, the corresponding link 402 is moved in the length direction of the link 402 by the respective protrusions 4015. In this application, the number of the protrusions 4015 on each rotating member 401 may be an even number, that is, two or four, and the like, which is not specifically limited in this application.

For example, referring to fig. 9, fig. 9 is a diagram illustrating the effect of using a tensioning assembly to tension a curtain sheet according to the embodiment of the present application. When each rotating member 401 rotates, the protrusion 4015 on the rotating member 401 can apply a force to the connecting rod 402 abutting against the protrusion 4015, so that the protrusion 4015 can move the connecting rod 402 in the length direction of the connecting rod 402. For example, when the rotating member 401 rotates and the protrusion 4015 moves the two connecting rods 402 in the tensioning assembly 400 where the rotating member 401 is located toward the top end of the protrusion 4015, the connecting rods 402 can move along the length direction of the connecting rods 402 in the direction away from the rotating member 401. The rotating member 401 rotates again, and when the protrusion 4015 drives the two connecting rods 402 in the tension assembly 400 where the rotating member 401 is located to move toward the bottom end of the protrusion 4015, the connecting rods 402 can move along the length direction of the connecting rods 402 toward the direction close to the rotating member 401. In this manner, by the movement of the two connecting bars 402, an adjustment of the distance between the two oppositely disposed support rims 100 connected to the two connecting bars 402 is achieved. It should be noted that, the principle of the other tensioning assembly 400 for tensioning the curtain sheet 200 can refer to the above embodiments, and the description thereof is omitted.

Alternatively, as shown in fig. 5, a side of each protrusion 4015 on the rotation member 401, which faces the corresponding connecting rod 402, has a first arc surface a1, and an end of each connecting rod 402 has a second arc surface b1 which contacts the first arc surface a 1. In this way, smooth sliding between the protrusion 4015 and the connecting rod 402 is enabled by the contact of the first arc surface a1 on the protrusion 4015 and the second arc surface b1 on the end of the connecting rod 402.

In the embodiment of the present application, as shown in fig. 6, 7 and 8, the side of the fixed member 300 facing away from the curtain sheet 200 in the projection screen has an opening 304 communicating with the accommodating chamber 301, the first rotating member 401a may have a first adjusting hole 4016 communicating with the opening 304, and the second rotating member 401b may have a second adjusting hole 4017 communicating with the first adjusting hole 4016. Referring to fig. 10, fig. 10 is an assembly view of an adjusting assembly and a tensioning assembly provided in the present application. The projection screen may further include: an adjustment assembly 500, the adjustment assembly 500 further being configured to: passes through the opening 304 of the fixed member 300 and is engaged with the first adjusting hole 4016 of the first rotating member 401a and/or the second adjusting hole 4017 of the second rotating member 401b, so as to rotate the first rotating member 401a and/or the second rotating member 401b when the adjusting assembly 500 rotates. In this way, the operator can conveniently drive the first rotating member 401a and/or the second rotating member 401b to rotate by using the adjusting assembly 500. For example, when the tightness of the curtain sheet 200 in the short side direction of the rectangular frame needs to be adjusted, an operator first passes a portion of the adjusting assembly 500 through the opening 304 of the fixing member 300 to be clamped with the first adjusting hole 4016 of the first rotating member 401a, and rotates the adjusting assembly 500 to drive the first rotating member 401a to rotate, so that the protrusion 4015 of the first rotating member 401a can drive the connecting rod 402 to move in the length direction of the connecting rod 402, thereby adjusting the distance between the two oppositely arranged long frames 100 a. When the tightness of the curtain sheet 200 in the long side direction of the rectangular frame needs to be adjusted, an operator firstly passes a part of the adjusting assembly 500 through the open hole 304 on the fixing member 300 to be clamped with the second adjusting hole 4017 on the second rotating member 401b, and rotates the adjusting assembly 500 to drive the second rotating member 401b to rotate, so that the protrusion 4015 on the second rotating member 401b can drive the connecting rod 402 to move in the length direction of the connecting rod 402, and further adjust the distance between the two short side frames 100b which are oppositely arranged. When the tensity of the curtain sheet 200 in the long side direction and the short side direction of the rectangular frame needs to be adjusted simultaneously, an operator firstly passes the adjusting assembly 500 through the open hole 304 on the fixing member 300 to be clamped with the first adjusting hole 4016 and the second adjusting hole 4017 simultaneously, rotates the adjusting assembly 500 to drive the first rotating member 401a and the second rotating member 401b to rotate simultaneously, so that the protrusion 4015 on the first rotating member 401a and the protrusion 4015 on the second rotating member 401b respectively drive the connecting rod 402 to move in the length direction of the connecting rod 402, and further adjusts the distance between the two oppositely arranged short frames 100b and the distance between the two oppositely arranged long frames 100 a.

Optionally, please refer to fig. 11 and 12, in which fig. 11 is a schematic structural diagram of two rotating components provided in an embodiment of the present application, and fig. 12 is a schematic structural diagram of an adjusting assembly provided in an embodiment of the present application. The inner wall of the first adjusting hole 4016 of the first rotating member 401a may have a first engaging groove A1, and the inner wall of the second adjusting hole 4017 of the second rotating member 401B may have a second engaging groove B1. The adjusting assembly 500 in the projection screen may have a clamping protrusion 501, and the clamping protrusion 501 may be used to clamp with a first clamping groove A1 on the inner wall of the first adjusting hole 4016 and/or a second clamping groove B1 on the second adjusting hole 4017. Therefore, the adjusting assembly 500 can be connected with the first rotating piece 401a and/or the second rotating piece 401b by clamping the clamping groove arranged in the adjusting hole and the clamping protrusion 501 on the adjusting assembly 500. For example, when the tightness of the curtain sheet 200 in the short side direction of the rectangular frame needs to be adjusted, an operator first passes the adjusting assembly 500 through the opening 304 on the fixing member 300 so that the clamping protrusion 501 on the adjusting assembly 500 is clamped with the first adjusting hole 4016 on the first rotating member 401a, and the rotating adjusting assembly 500 applies an acting force to the first rotating member 401a through the clamping protrusion 501 to drive the first rotating member 401a to rotate. When the tightness of the curtain sheet 200 in the long side direction of the rectangular frame needs to be adjusted, an operator firstly passes the adjusting assembly 500 through the opening 304 on the fixing member 300 so that the clamping protrusion 501 on the adjusting assembly 500 is clamped with the second adjusting hole 4017 on the second rotating member 401b, and the rotating adjusting assembly 500 applies an acting force to the second rotating member 401b through the clamping protrusion 501 to drive the second rotating member 401b to rotate. When the tensity of the curtain sheet 200 in the long side direction and the short side direction of the rectangular frame needs to be adjusted simultaneously, an operator firstly passes the adjusting assembly 500 through the opening 304 on the fixing member 300 so that the clamping protrusion 501 on the adjusting assembly 500 is clamped with the first adjusting hole 4016 and the second adjusting hole 4017 simultaneously, and rotates the adjusting assembly 500 to drive the first rotating member 401a and the second rotating member 401b to rotate simultaneously. It should be noted that, for the moving manner of the rotating member 401 driving the connecting rod 402 to rotate, reference may be made to the description in the above embodiments, and details are not described herein again. For example, the number of the first catching grooves A1 on the inner wall of the first adjusting hole 4016 may be at least one, for example, one, three, or five, etc., the number of the second catching grooves B1 on the inner wall of the second adjusting hole 4017 may be at least one, for example, one, three, or five, etc., and the number of the first catching grooves A1 and the number of the second catching grooves B1 may be the same or different, which is not specifically limited in this embodiment of the application.

In the embodiment of the present application, please refer to fig. 12 and 13, and fig. 13 is an exploded schematic view of an adjusting assembly according to the embodiment of the present application. The adjustment assembly 500 in the projection screen may include: an adjusting rod 502 and a limit ring 503 detachably connected with the adjusting rod 502. One end of the adjusting rod 502 can be provided with a clamping protrusion 501, and the side wall of the end of the adjusting rod 502 departing from the clamping protrusion 501 can be provided with a plurality of limiting grooves. Wherein the stop collar 503 may be configured to: when being located different spacing inslot, deviate from the one side butt of curtain piece with the mounting to make protruding 501 joint can with first joint groove A1 and/or the joint of second joint groove B1 joint of joint. Illustratively, the side wall of the adjusting lever 502 may have a first stopper groove 5021, a second stopper groove 5022, and a third stopper groove 5023. The first limit groove 5021 may be closer to the clamping protrusion 501 than the third limit groove 5023, and the second limit groove 5022 may be located between the first limit groove 5021 and the third limit groove 5023. Please refer to fig. 14, fig. 14 is an assembly effect diagram of an adjusting lever and a rotating member according to an embodiment of the present disclosure. When the limit ring 503 connected to the adjusting lever 502 is located in the first limit groove 5021 on the adjusting lever 502, the engaging protrusion 501 on the adjusting lever 502 can engage with the second engaging groove B1 on the second rotating member 401B and separate from the first engaging groove A1 on the first rotating member 401 a. Referring to fig. 15, fig. 15 is a diagram illustrating an assembly effect of another adjustment lever and a rotation member according to an embodiment of the present disclosure. When the limit ring 503 connected with the adjusting lever 502 is located in the second limit groove 5022 on the adjusting lever 502, the clamping protrusion 501 on the adjusting lever 502 can be clamped with the first clamping groove A1 and the second clamping groove B1 at the same time. When the limit ring 503 connected to the adjusting lever 502 is located in the third limit groove 5023, the engaging protrusion 501 of the adjusting lever 502 can engage with the first engaging groove A1 of the first rotating member 401a and separate from the second engaging groove B1 of the second rotating member 401B. In this case, a clamping protrusion 501 is provided at one end of the adjusting rod 502, and a limit ring 503 is sleeved on the adjusting rod 502. When the clamping protrusion 501 on the adjusting lever 502 is clamped with the first clamping groove A1 on the first rotating member 401a, the limiting ring 503 may be located in the third limiting groove 5023, and the limiting ring 503 may contact with one side of the fixing member 300 departing from the curtain sheet 200. Thus, the adjusting rod 502 can be effectively prevented from moving in the axial direction (i.e., the clamping protrusion on the adjusting rod is prevented from being separated from the first clamping groove). When the clamping protrusion 501 on the adjustment rod 502 is clamped with the first clamping groove A1 on the first rotating member 401a and the second clamping groove B1 on the second rotating member 401B, the limiting ring 503 may be located in the second limiting groove 5022, and the limiting ring 503 may contact with one side of the fixing member 300 departing from the curtain sheet 200. Thus, the adjusting rod 502 can be effectively prevented from moving in the axial direction (namely, the clamping protrusion on the adjusting rod is prevented from being separated from one of the clamping grooves). When the clamping protrusion 501 of the adjusting lever 502 is clamped with the second clamping groove B1 of the second rotating member 401B, the limiting ring 503 may be located in the first limiting groove 5021, and the limiting ring 503 may contact with one side of the fixing member 300 departing from the curtain sheet 200. So, can effectually prevent to adjust pole 502 and remove on its axial direction (prevent promptly that the joint arch on the regulation pole breaks away from with second joint groove).

Optionally, as shown in fig. 13, the adjusting rod 502 of the adjusting assembly 500 may further have a sliding slot 5024, the sliding slot 5024 may communicate with each limit slot, and the inner wall of the limit ring 503 of the adjusting assembly 500 may have a limit boss 5031 slidably connected with the sliding slot 5024. For example, when the side wall of the adjustment lever 502 has a first stopper groove 5021, a second stopper groove 5022, and a third stopper groove 5023, the sliding groove 5024 may communicate with the first stopper groove 5021, the second stopper groove 5022, and the third stopper groove 5023, respectively. For example, when the limit ring 503 needs to be limited in the third limit groove 5023, a user can slide the limit ring 503 into the third limit groove 5023 on the adjustment lever 502 along the sliding slot 5024 on the adjustment lever 502 through the limit boss 5031 on the limit ring 503, and rotate the limit ring 503 by a certain angle relative to the adjustment lever 502, so that the limit boss 5031 on the limit ring 503 is staggered with the sliding slot 5024, and the limit ring 503 can be limited in the third limit groove 5023. When the position of the position-limiting ring 503 needs to be limited in the second position-limiting groove 5022, a user rotates the position-limiting ring 503 to align the position-limiting boss 5031 on the position-limiting ring 503 with the sliding groove 5024, and then shifts the position-limiting ring 503 into the second position-limiting groove 5022, and rotates the position-limiting ring 503 at a certain angle relative to the adjusting rod 502, so that the position-limiting boss 5031 on the position-limiting ring 503 is staggered with the sliding groove 5024, and the position-limiting ring 503 can be limited in the second position-limiting groove 5022. When the position of the position-limiting ring 503 needs to be limited in the first position-limiting groove 5021, the user rotates the position-limiting ring 503 to make the position-limiting boss 5031 on the position-limiting ring 503 align with the sliding groove 5024, and then shifts the position-limiting ring 503 into the first position-limiting groove 5021, and rotates the position-limiting ring 503 at a certain angle relative to the adjusting rod 502, so that the position-limiting boss 5031 on the position-limiting ring 503 is staggered with the sliding groove 5024, and the position-limiting ring 503 can be limited in the first position-limiting groove 5021. In other possible implementations, the limiting ring 503 may be a structure with elasticity, and the limiting ring 503 may be sleeved on the adjusting rod 502 by the elastic force thereof, and the position of the limiting ring 503 on the adjusting rod 502 is changed by pulling the limiting ring 503.

In the embodiment of the present application, as shown in fig. 13, the adjusting assembly 500 in the projection screen may further include: a handle piece 504, which handle piece 504 can be connected to the end of the adjusting lever 502 facing away from the snap-in projection 501. Under the condition, the user can drive the adjusting rod 502 to rotate by rotating the handle piece 504, so that the operation convenience of the user is improved, and the use experience of the user is better. For example, the end of the adjusting rod 502 facing away from the engaging protrusion 501 may have a connecting through hole c1, the handle member 504 may have a cylindrical structure, and the handle member 504 may be connected to the adjusting rod 502 through the connecting through hole c 1.

In the embodiment of the present application, as shown in fig. 5, at least one set of guide bosses 305 may be provided on a side wall of the receiving cavity 301 in the fixing member 300, and each set of guide bosses 305 may include two oppositely disposed guide bosses. The connecting rod 402 may be located between two oppositely disposed guide bosses 305, and the distance between the two oppositely disposed guide bosses 305 may be equal to the width of the connecting rod 402. In this case, the connecting rod 402 can move along the length direction of the connecting rod 402 under the guiding action of the two oppositely arranged guiding bosses 305, so that the stability of the movement of the connecting rod 402 is effectively improved. It should be noted that, when the length of the connecting rod 402 is small, the guide bosses 305 may not be provided on both sides of the connecting rod 402.

In the embodiment of the present application, please refer to fig. 16 and 17, fig. 16 is a schematic structural diagram of another projection screen provided in the embodiment of the present application, and fig. 17 is an exploded view of the projection screen shown in fig. 16. The projection screen may further include: four support rods 600 and a plurality of rotational connectors 700. The four support rods 600 may correspond one-to-one to the four support rims 100 and to the four connecting rods 402 in the two tensioning assemblies. One end of each support bar 600 may be connected to the end of the corresponding connecting rod 402 of the support bar 600, which is located outside the fixing member 300, through a rotating connector 700, and the other end is connected to the corresponding support frame 100 through a rotating connector 700. Wherein the mount 300 in the projection screen may be configured to: when the curtain sheet 200 moves, the two supporting frames 100 are driven by the rotation connecting member 700 and the supporting rod 600 to move towards each other.

In this application, the number of the supporting rods 600 can be four, correspondingly, the number of the plurality of rotating connecting pieces 700 can be eight, one ends of the four supporting rods 600 are respectively connected with the four supporting frames 100 through the rotating connecting pieces 700 in a rotating manner, and the other ends of the four supporting rods 600 are connected with the connecting rods 402 through the rotating connecting pieces 700 in a rotating manner. Thus, when the fixing member 300 is forced to move in the direction of the curtain sheet 200, first, the support bar 600 can rotate with respect to the rotation connector 700. Then, the supporting rod 600 drives the two oppositely disposed supporting frames 100 to move towards each other. Then, the supporting frame 100 can drive the edges of the curtain sheet 200 to move towards each other, so as to adjust the tension of the curtain sheet 200 in the short side direction of the rectangular frame and/or the long side direction of the rectangular frame by the fixing member 300, the supporting rod 600 and the rotating connecting member 700.

Please refer to fig. 18, fig. 18 is a diagram illustrating an effect of tensioning a curtain sheet by using a fixing member, a supporting rod and a rotating connecting member according to an embodiment of the present application. After the curtain sheet 200 is tensioned by the fixing piece 300, the supporting rod 600 and the rotating connecting piece 700, the distance between the side faces of the two oppositely arranged supporting frames 100 departing from the fixing piece 300 is greater than the width of the curtain sheet 200 when the curtain sheet 200 is not tensioned, that is, the distance between the side faces of the oppositely arranged long frames 100a departing from the fixing piece 300 is greater than the width of the curtain sheet 200 when the curtain sheet 200 is not tensioned in the short side direction of the rectangular frame; the distance between the sides of the oppositely arranged short frames 100b facing away from the fixing member 300 is greater than the width of the curtain sheet 200 in the long side direction of the rectangular frame when not tensioned. Thus, when the fixing member 300, the supporting rod 600 and the rotation connecting member 700 are mounted to the rear surface of the curtain sheet 200, the fixing member 300 is in the arching state. When a force is applied to the fixing member 300 and the fixing member 300 moves toward the curtain sheet 200, the fixing member 300, the supporting rod 600 and the rotating connecting member 700 drive the long frame 100a and the short frame 100b to move away from the fixing member 300, so as to tension the curtain sheet 200.

For example, please refer to fig. 19, fig. 19 is a schematic view illustrating a connection between a support bar and a support frame according to an embodiment of the present disclosure. The four support rods 600 may include: two first support bars 601 and two second support bars 602. The length directions of the two first supporting rods 601 are parallel to the long side direction of the rectangular frame, the length directions of the two second supporting rods 602 are parallel to the short side direction of the rectangular frame, the lengths of the two first supporting rods 601 are the same, and the lengths of the two second supporting rods 602 are also the same. Like this, can guarantee that tensioning assembly 400 is unanimous at the length direction of rectangular frame and the rate of tension to the curtain piece in rectangular frame's minor face direction, and then make the roughness of curtain piece 200 better.

Optionally, referring to fig. 20, fig. 20 is a schematic partial structural diagram of a projection screen provided in an embodiment of the present application. The side of the fixing member 300 in the projection screen 000 may have a plurality of openings 306 in one-to-one correspondence with the plurality of connection bars 402, and a portion of each connection bar 402 may protrude out of the fixing member 300 through the opening 306. Thus, when the rotating member 401 is located in the accommodating cavity 301, the portion of the connecting rod 402 abutting against the rotating member 401 can extend out of the fixed member 300 through the opening 306, and the fixed member 300 can modify the portion of the rotating member 401 located in the accommodating cavity 301 of the fixed member 300.

Alternatively, as shown in fig. 20, the projection screen may further include: a guide rod 800 and a stop rod 900. The end of the guide rod 800 may be fixedly connected to the outer side of the fixing member 300, the guide rod 800 may have a plurality of limiting holes 801 arranged in an array along the length direction of the guide rod 800, and the limiting rod 900 may be connected to the guide rod 800 through any of the limiting holes 801. The rotation connector 700 coupled to the fixing member 300 may have a guide hole d4 slidably coupled to the guide bar 800, and the stopper bar 900 may be configured to: after the rotational connector 700 slides on the guide bar 800, the rotational connector 700 is connected to the stopper hole 801 adjacent to the rotational connector 700 among the plurality of stopper holes 801 to abut against the side of the rotational connector 700 close to the fixing member 300. In the present application, the guide bar 800 has a length direction parallel to that of the connection bar 402 to which the rotation link 700 is connected. The side of the fixing member 300 may have a third screw hole d5, and the guide bar 800 may be a screw with an external thread. One end of the rotary connector 700 close to the fixing member 300 is fixedly connected with one end of the connecting rod 402 far from the fixing member 300, and is sleeved on the screw through the guiding hole d 4. Thus, in the process that the connecting rod 402 drives the rotating connector 700 and the supporting rod 600 to move, the rotating connector 700 can slide on the screw, and when the guiding hole d4 on the rotating connector 700 slides to the target position (when the target position is the curtain sheet tensioning, the guiding hole d4 on the rotating connector 700 slides to the position on the screw), the limiting rod 900 stops the rotating connector 700 from moving towards the direction close to the fixing member 300. For example, when the first rotating member 401a is used to adjust the tightness of the curtain sheet 200 in the short side direction of the rectangular frame, first, the user removes the limiting rod 900 from the limiting hole 801 of the guide rod 800, and rotates the first rotating member 401a to adjust the tightness of the curtain sheet 200 in the short side direction of the rectangular frame; then, the limiting rod 900 is inserted into the limiting hole 801 adjacent to the rotating connector 700, so that one side of the rotating connector 700 close to the fixing member 300 abuts against the limiting rod 900, thereby preventing the rotating connector 700 from sliding on the guide rod 800, and playing a certain protection role in the tensioning state of the curtain sheet 200. For adjusting the tension of the curtain sheet 200 in the long side direction of the rectangular frame by using the second rotating member 401b, the action principle of the limiting rod 900 may be the above-mentioned embodiment, and will not be described herein again.

Alternatively, please refer to fig. 21 and 22, wherein fig. 21 is a schematic structural diagram of a rotational connector provided in an embodiment of the present application, and fig. 22 is an exploded view of the rotational connector shown in fig. 21. The rotational connector 700 may include: a connector body 701 and a rotor 702. The connector body 701 is fixedly connected with the support frame 100 or the connecting rod 402, and the end of the support rod 600 is rotatably connected with the connector body 701 through the rotating body 702. For example, when the fixing member 300 moves toward the curtain sheet 200, the rotating body 702 and the connecting member body 701 can rotate relatively, so that the connecting member body 701 can drive the two oppositely disposed supporting frames 100 to move relatively, and further the supporting frames 100 drive the edges of the curtain sheet 200 to move relatively, so as to adjust the flatness of the curtain sheet 200 in the long side direction of the rectangular frame and the flatness of the curtain sheet 200 in the short side direction of the rectangular frame.

In this application, please refer to fig. 22 and 23, fig. 23 is a schematic structural diagram of another rotational connection member provided in an embodiment of this application. The rotating body 702 may include: an adaptor 7021, a first pin 7022, a second pin 7023, a first stop 7024, and a second stop 7025. One end of the adapter 7021 is rotatably connected to the connector body 701 through a first pin 7022, and the other end of the adapter 7021 is fixedly connected to the end of the support rod 600 through a second pin 7023. The first retaining part 7024 is connected to the adaptor 7021, the second retaining part 7025 is connected to the connector body 701, and the first retaining part 7024 may be configured to: when the adaptor 7021 rotates to an assigned position around the first pin 7022, the adaptor 7021 is connected to the second stopper 7025 in a matching manner, so as to limit the relative movement between the adaptor 7021 and the connector body 701. Thus, the flatness of the projection screen can be ensured when the projection screen is flattened.

In the embodiment of the present application, when the adaptor 7021 rotates to a specific position around the first pin 7022 through the first retaining part 7024 and the second retaining part 7025, the adaptor 7021 and the connector body 701 can be stably connected to each other. As shown in fig. 23, one of the first retaining member 7024 and the second retaining member 7025 may include: a limiting cylinder d1, a limiting ball d2 and a compression spring (not shown in the figure). The other of the first retaining member 7024 and the second retaining member 7025 may comprise: accommodating the hole d3. Wherein, compression spring can fix in spacing section of thick bamboo d1, and the part of spacing spheroid d2 is located spacing section of thick bamboo d1, and another part is located outside spacing section of thick bamboo d1, and spacing spheroid d2 and compression spring's end connection. When the adaptor 7021 rotates to a designated position around the first pin 7022, the accommodating hole d3 is communicated with the limiting cylinder d1, so that part of the limiting ball d2 can be located in the accommodating hole d3 to limit relative movement between the adaptor 7021 and the connector body 601. In the present application, the first limit stop 7024 may include: a spacing section of thick bamboo d1, spacing spheroid d2 and compression spring. The second retaining member 7025 may include: a housing hole d3; alternatively, the first limit part 7024 may include: the accommodating hole d3 and the second retaining part 7025 may include: a limiting cylinder d1, a limiting sphere d2 and a compression spring. The embodiment of the present application does not limit this. It should be noted that, in the following embodiments, the first limiting part 7024 includes the accommodating hole d3, and the second limiting part 7025 may include: the limiting cylinder d1, the limiting ball d2 and the compression spring are schematically illustrated as an example.

For example, in the process of stretching the curtain sheet 200 by using the fixing member 300, the supporting rod 600 and the rotating connecting member 700, the fixing member 300 moves towards the curtain sheet 200, and the adaptor 7021 can rotate to a designated position around the first pin 7022, that is, when the limiting cylinder d1 is communicated with the accommodating hole d3. The limiting ball body d2 is popped up under the elastic force of the compression spring, so that a part of the limiting ball body d2 is positioned in the containing hole d3. Therefore, the limit of the adaptor 7021 and the connector body 701 is realized.

In another possible implementation manner, please refer to fig. 24, and fig. 24 is a schematic view illustrating a connection between a limiting member and a rotating connecting member according to an embodiment of the present application. One of the first retaining member 7024 and the second retaining member 7025 includes: the other of the limit screw e1, the first limit stop 7024, and the second limit stop 7025 comprises: a threaded bore. It should be noted that the threaded hole may be a receiving hole d3, and the limit screw e1 has an external thread. The limit screw e1 may be provided in the limit cylinder d 1. When the adaptor 7021 rotates to a specific position around the first pin 7022, that is, the limiting cylinder d1 is communicated with the accommodating hole d3, a part of the limiting screw e1 may be located in the accommodating hole d3 to limit the relative movement between the adaptor 7021 and the connector body 701. In the present application, the first limiter 7024 may be a limiting screw e1, and the second limiter 7025 may be a threaded hole; alternatively, the first retaining member 7024 may be a threaded hole, and the second retaining member 7025 may be a retaining screw. In the following embodiments, the second limiting member 7025 is used as a limiting screw, and the first limiting member 7024 is used as a threaded hole for illustration. For example, in the process of stretching the curtain sheet 200, the fixing member 300 moves towards the curtain sheet 200, and the adaptor 7021 can rotate to a designated position around the first pin 7022, that is, when the limiting cylinder d1 is communicated with the accommodating hole d3; the operator can rotate the limit screw e1, and the limit screw e1 moves through the thread fit, so that a part of the limit screw e1 is positioned in the accommodating hole d3. Thus, the limit between the adaptor 7021 and the connector body 701 is realized.

Referring to fig. 25, fig. 25 is a schematic view illustrating another connection between a position limiting member and a rotating connecting member according to an embodiment of the present disclosure. The first locating part 7024 and the second locating part 7025 may both be strong magnets f1, the two strong magnets f1 may be located in the locating cylinder d1 and the accommodating hole d3, respectively, and a polarity of an opening, close to the locating cylinder d1, of the strong magnet f1 located in the locating cylinder d1 is opposite to a polarity of an opening, close to the strong magnet f1 located in the accommodating hole d3. Wherein, when the adaptor 7021 rotates to the designated position around the first pin 7022, that is, the limiting cylinder d1 is communicated with the accommodating hole d3, the two opposite sides of the two strong magnets f1 are connected by magnetic force to limit the relative movement between the adaptor 7021 and the connecting piece body 701. For example, in the process of stretching the curtain sheet 200, the fixing member 300 moves towards the direction of the curtain sheet 200, and the adaptor 7021 can rotate to a designated position around the first pin 7022, that is, when the limiting cylinder d1 is rotated to communicate with the accommodating hole d3; two sides of the two strong magnets f1 with opposite polarities are connected by magnetic force. Thus, the limit of the adaptor 7021 and the connector body 401 is realized.

Optionally, please refer to fig. 26 and 27, where fig. 26 is a schematic connection diagram of a supporting frame and a corner block provided in an embodiment of the present application, and fig. 27 is a schematic structural diagram of a corner block provided in an embodiment of the present application. Projection screen 000 may also include: a plurality of corner blocks 1000, one corner block 1000 may be between each two adjacent support rims 100 of the plurality of support rims 100. For example, the number of the plurality of supporting frames 100 in the projection screen 000 may be four, and the number of the plurality of corner blocks 1000 may also be four, and the end portions of two adjacent supporting frames 100 in the four supporting frames 100 are connected by one corner block 1000. In this manner, four support borders 100 and four corner blocks 1000 may form a rectangular frame. In the present application, corner block 1000 in projection screen 000 may include: two interconnecting portions 1010, and two interconnecting portions 1010 may correspond to two adjacent support frames 100 one to one. Each of the two connection portions 1010 may have a receiving groove 1011 for receiving an end of the corresponding support frame 100, and a guide groove 1012 communicating with the receiving groove 1011. The longitudinal direction of the guide groove 1012 of each linking portion 1010 is parallel to the longitudinal direction of the support frame 100 corresponding to the linking portion 1010. The projection screen may further include: and a guide A2, wherein after the end of the supporting frame 100 is located in the corresponding receiving groove 1011 of the connecting portion 1010, the guide A2 can pass through the second guiding groove 1012 to be fixedly connected with the supporting frame 100. In this case, the corner block 1000 and the supporting bezel 100 are connected by the guide A2, and the corner block 1000 and the supporting bezel 100 can be prevented from coming off. In addition, because two adjacent supporting frames 100 are connected through the corner block 1000, the included angle of the two adjacent supporting frames 100 is limited through the corner block 1000, the regularity of the formed rectangular frame is further ensured, and the problem that the corner of the rectangular frame forms a sharp corner is avoided.

Illustratively, when the tensioning assembly 400 is used to adjust the tension of the curtain sheet 200 in the short side direction of the rectangular frame and/or the tension of the curtain sheet 200 in the long side direction of the rectangular frame, since the tensioning assembly 400 is connected to the two oppositely disposed support frames 100 through the support rod 600, the guide A2 can slide in the second guide groove 1012 along the length direction of the second guide groove 1012. Therefore, the two oppositely disposed supporting frames 100 can move towards each other to stretch the curtain sheet 200 in a direction perpendicular to the supporting frames 100.

In this application embodiment, as shown in fig. 27, the corner block 1000 may be a right-angle corner block, two connecting portions 1010 of the right-angle corner block 1000 have a receiving groove 1011, and the end portions of the supporting frames 100 are inserted into the receiving groove 1011, so that after the corner block 1000 is connected with two adjacent supporting frames 100, it can be ensured that an included angle formed by the two adjacent supporting frames 100 is a right angle, and the regularity of the formed rectangular frame is further ensured.

For example, after the projection screen 000 includes the parts to be entered into the room, first, the corner of the curtain sheet 200 is fixed to the corner block 1000; then, connecting the two ends of the supporting frame 100 with the corresponding corner blocks 1000 respectively; then, the tensioning assembly 400 is connected to the supporting frames 100 in the rectangular frame through the supporting rod 600, and at this time, the two supporting frames 100 which are oppositely arranged can be driven to move oppositely by the tensioning assembly 400, so that the curtain sheet 200 is tensioned, and the flatness of the curtain sheet 200 is ensured.

Alternatively, as shown in fig. 27, the receiving groove 1011 in the connecting portion 1010 may have a first notch g1 facing one side of the support frame 100 and a second notch g2 facing the curtain sheet 200. Wherein, a depth of the receiving groove 1011 in a direction perpendicular to the second notch g2 may be equal to a thickness of the support frame 100. Thus, after the end of the supporting frame 100 is located in the receiving cavity 1011, the surface of the supporting frame 100 facing the curtain sheet 200 and the surface of the corner block 1000 facing the curtain sheet 200 are coplanar, and the surface of the rectangular frame facing the curtain sheet 200 has better flatness, so that the curtain sheet 200 adhered to the rectangular frame has better flatness.

Referring to fig. 28, fig. 28 is a schematic structural diagram of another projection screen provided in the embodiment of the present application. The projection screen may further include: the hanging parts A3, A3 can be fixedly connected with the fixing part 300 and the reference plane respectively to realize the suspension of the projection screen on the reference plane. Wherein, the reference plane can be a plane connected with the hanging piece in a wall body or other supporting objects. Thus, by way of example, the suspension A3 may comprise: a set screw, an adhesive film, or a magnet. For example, when the hanging member is an adhesive film, one side of the adhesive film is connected to the side of the fixing member 300 away from the curtain sheet 200, and the other side of the adhesive film is connected to the reference plane, so as to hang the projection screen 000 on the reference plane.

In the embodiment of the present application, the curtain sheet 200 may also be an optical curtain sheet, the edge of the optical curtain sheet is connected to the side of the supporting frame 100, and the corner of the optical curtain sheet is connected to the side of the corner block 1000. The optical curtain sheet is internally provided with a micro-mirror reflection structure which can reflect the light emitted by the laser projection equipment in a specific direction. Therefore, the light reflected by the micro-mirror reflection structure can reach the eyes of a user to the maximum extent, so that the user can watch a clearer picture. By way of example, the optical curtain sheet may include: circular fresnel optical film, black grid screen or white plastic screen.

In the present application, a flexible curtain may also be used for the display of the projection picture. The flexible curtain may include a curtain sheet and a flexible carrier (not shown), the curtain sheet may be fixed to one side of the flexible carrier, and the edges of the flexible carrier extend out of four side edges of the curtain sheet. The other side of the flexible carrier may be attached to a rectangular frame. The screen can be an optical film, and the optical film is used for being matched with a projection host machine for use. The projection host is used for emitting light beams to the optical diaphragm, and the optical diaphragm is used for receiving and reflecting the light beams to display pictures. The curtain may be secured to the flexible carrier by means of an adhesive. For example, the flexible carrier may be a flexible cloth, and certainly, may also be another flexible member, as long as the flexible carrier can be bent at will and has a certain flatness after being tensioned, which is not limited in this embodiment of the application. It should be noted that, the projection of the flexible carrier on the plane where the curtain is located covers the curtain or covers four side edges of the curtain, so as to ensure that the edge of the flexible carrier extends out of the four side edges of the curtain, and further ensure the flatness of the curtain while tensioning the flexible carrier.

In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The above description is intended only to illustrate the alternative embodiments of the present application, and should not be construed as limiting the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A projection screen, comprising:

the curtain sheet is connected with the rectangular frame;

and at least part is located the holding intracavity and with two tensioning assembly that the mounting is connected, two tensioning assembly with two sets of support frames one-to-one that set up relatively, every tensioning assembly includes: the device comprises a rotating piece and two connecting rods, wherein one ends of the two connecting rods are respectively connected with two supporting frames in a corresponding group of oppositely arranged supporting frames, and the other ends of the two connecting rods are abutted against the rotating piece;

wherein two rotating members within the two tensioning assemblies are relatively rotatable therebetween, each of the rotating members being configured to: when the rotating piece rotates, the two connecting rods in the tensioning assembly where the rotating piece is located are driven to move in the length direction of the connecting rods.

2. The projection screen of claim 1 wherein the two rotational members in the two tensioning assemblies are each: a first rotating member and a second rotating member;

one side of the first rotating piece, which faces the second rotating piece, is provided with a first movable connecting piece, and one side of the second rotating piece, which faces the first rotating piece, is provided with a second movable connecting piece which is rotatably connected with the first movable connecting piece;

a third movable connecting piece is arranged on one side, away from the second rotating piece, of the first rotating piece, and a fourth movable connecting piece which is rotatably connected with the third movable connecting piece is arranged on one side, facing the first rotating piece, of the inner wall of the accommodating cavity;

and a fifth movable connecting piece is arranged on one side of the second rotating piece, which is far away from the first rotating piece, and a sixth movable connecting piece which is rotatably connected with the fifth movable connecting piece is arranged on one side, which faces the second rotating piece, in the inner wall of the accommodating cavity.

3. The projection screen of claim 2, wherein the side of the fixed member facing away from the curtain sheet has an opening in communication with the receiving cavity, the first rotating member has a first adjustment hole in communication with the opening, and the second rotating member has a second adjustment hole in communication with the first adjustment hole;

the projection screen further includes: an adjustment assembly configured to: the adjusting assembly is connected with the first adjusting hole and/or the second adjusting hole in a clamped mode, and the first rotating piece and/or the second rotating piece are driven to rotate when the adjusting assembly rotates.

4. The projection screen of claim 3, wherein the inner wall of the first adjusting hole is provided with a first clamping groove, the inner wall of the second adjusting hole is provided with a second clamping groove, the adjusting assembly is provided with a clamping protrusion, and the clamping protrusion is used for being clamped with the first clamping groove and/or the second clamping groove.

5. The projection screen of claim 4 wherein the adjustment assembly comprises: the clamping protrusion is arranged at one end of the adjusting rod, and a plurality of limiting grooves are formed in the side wall of the adjusting rod, which is far away from the clamping protrusion;

wherein the stop collar is configured to: be located the difference when the spacing inslot, with the mounting deviates from the one side butt of curtain piece, so that the joint protruding with first joint groove and/or second joint groove joint.

6. The projection screen of claim 5, wherein the adjusting rod has a sliding groove on a side wall thereof, the sliding groove is communicated with each of the limiting grooves, and a limiting boss slidably connected with the sliding groove is provided on an inner wall of the limiting ring.

7. The projection screen of claim 5 wherein the adjustment assembly further comprises: and the handle piece is connected with the end part of the adjusting rod, which deviates from the clamping protrusion.

8. The projection screen of any one of claims 1 to 7, wherein each of the rotating members has at least two protrusions, two of the at least two protrusions correspond to two connecting rods in the tensioning assembly where the rotating member is located, one-to-one, and each protrusion can abut against an end of the corresponding connecting rod;

wherein each of the rotating pieces is configured to: when the rotating piece rotates, the corresponding connecting rods are driven to move in the length direction of the connecting rods through the protrusions.

9. The projection screen of any one of claims 1-7 wherein the projection screen further comprises: four support rods and a plurality of rotating connectors;

the four supporting rods correspond to the four supporting frames one by one and correspond to the four connecting rods in the two tensioning assemblies one by one, one end of each supporting rod is connected with the end part, outside the fixed part, of the corresponding connecting rod through one rotating connecting piece, and the other end of each supporting rod is connected with the corresponding supporting frame through one rotating connecting piece;

wherein the fixture is configured to: when the curtain sheet moves towards the direction of the curtain sheet, the rotating connecting piece and the supporting rod drive the two oppositely arranged supporting frames to move oppositely.

10. The projection screen of claim 9, wherein the projection screen further comprises: the end part of the guide rod is fixedly connected with the outer side surface of the fixing part, a plurality of limiting holes are formed in the guide rod and are arrayed along the length direction of the guide rod, and the limiting rod is connected with the guide rod through any limiting hole;

the rotating connecting piece connected with the fixing piece is provided with a guide hole in sliding connection with the guide rod, and the limiting rod is configured to: after the rotating connecting piece slides on the guide rod, the rotating connecting piece is connected with the limiting holes in the plurality of limiting holes and adjacent to the rotating connecting piece so as to be abutted against one side, close to the fixing piece, of the rotating connecting piece.