CN217739707U - Projection screen - Google Patents

Abstract

The application discloses projection screen belongs to projection technical field. The projection screen may include a frame, a flexible curtain, a support rod, and a tensioning mechanism. After the clamping hook in the tensioning mechanism is clamped with the supporting rod, the handle piece in the tensioning mechanism can deviate from the supporting rod to rotate, so that the clamping hook can apply tensioning force to the flexible curtain through the supporting rod, and the flatness of the flexible curtain is good. In the assembling process to the projection screen in this application, operating personnel only need control the handle spare among the straining device and rotate, just can let the pothook among the straining device pass through the bracing piece and exert the tension to flexible curtain, need not to exert alone the extension power to the spring. The force applied by the operator to rotate the handle member is significantly less than the force applied by the operator to elongate the spring. Therefore, the assembling difficulty of the projection screen is lower, the assembling process of the projection screen is effectively simplified, and the assembling efficiency of the projection screen can be guaranteed to be higher.

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 the display of pictures.

In the related art, the size of the projection screen is larger and larger, and the space occupied by the projection screen is larger, so that the transportation difficulty of the projection screen is higher.

In order to reduce the transportation difficulty, the projection screen is usually required to be prepared to be detachable. However, the assembly process of the present detachable projection screen is complicated, resulting in low assembly efficiency of the projection screen.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a projection screen. The problem that the assembly efficiency of the projection screen in the prior art is low can be solved, the technical scheme is as follows:

there is provided a projection screen comprising: the device comprises a frame, a flexible curtain, a support rod and a tensioning mechanism;

the flexible curtain is attached to the front face of the frame, and the edge part of the flexible curtain is folded to wrap the edge of the frame;

the supporting rod is positioned on the back of the frame and is connected with the edge part of the flexible curtain;

the tensioning mechanism comprises: the connecting piece is fixed on the back of the frame, the handle piece is rotationally connected with the connecting piece, and the clamping hook is rotationally connected with the handle piece;

wherein the handle piece is configured to: after the clamping hook is clamped with the supporting rod, the clamping hook deviates from the supporting rod to rotate, so that the clamping hook exerts tension force deviating from the edge part of the flexible curtain on the supporting rod.

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

a projection screen comprising: frame, flexible curtain, bracing piece and straining device. After pothook and the bracing piece joint in the straining device, the handle spare in the straining device can deviate from the bracing piece and rotate, makes the pothook can exert the straining force that deviates from the marginal part of flexible curtain to supporting to make the bracing piece can exert the straining force to flexible curtain, make the positive flatness of the flexible carrier in the flexible curtain better, in order to guarantee that the display effect of the projection picture that presents on the curtain in the flexible curtain is better. In the assembling process to the projection screen in this application, operating personnel only need control the handle spare rotation in the straining device, just can let the pothook in the straining device exert the straining force to the bracing piece, need not operating personnel and exert tensile power to the spring alone. The force applied by the operator to rotate the handle member is significantly less than the force applied by the operator to elongate the spring. Therefore, the assembling difficulty of the projection screen is lower, the assembling process of the projection screen is effectively simplified, and the assembling efficiency of the projection screen can be guaranteed to be higher.

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 detachable projection screen provided in the related art;

fig. 2 is a schematic structural diagram of a projection screen provided in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a flexible curtain provided in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a tensioning mechanism provided in an embodiment of the present application;

FIG. 5 is a schematic view of the connection relationship between the flexible curtain, the support rod and the tensioning mechanism provided in the embodiment of the present application;

FIG. 6 is a schematic structural view of another tensioning mechanism provided in embodiments of the present application;

FIG. 7 is a schematic structural diagram of a spring element according to an embodiment of the present application;

FIG. 8 is a schematic view of a resilient member engaged with a connector according to an embodiment of the present disclosure;

FIG. 9 is a schematic view of an embodiment of the present application providing a resilient member engaged with a grip element;

FIG. 10 is a schematic view of a handle member according to an embodiment of the present application;

FIG. 11 is a schematic structural view of yet another tensioning mechanism provided by an embodiment of the present application;

FIG. 12 is a schematic view of a handle member and attachment member connection provided by an embodiment of the present application;

fig. 13 is a partially enlarged view of a projection screen at a rear edge according to an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

In the related art, in order to solve the problem that the transportation difficulty of the projection screen is high due to the large overall size of the projection screen, the projection screen can be prepared to be detachable. For example, as shown in fig. 1, fig. 1 is a schematic structural diagram of a detachable projection screen provided in the related art. Projection screen 00 may generally include: a frame 01, a flexible curtain 02, a support rod (not marked in the figure) and a spring 03.

The flexible curtain 02 in the projection screen 00 is attached to the front surface of the frame 01, and the edge part of the flexible curtain 02 is folded to wrap the edge of the frame 01.

The support rods in the projection screen 00 may be located at the back of the frame 01, and after the edge portion of the flexible curtain 02 is folded to wrap the edge of the frame 01, the support rods may be connected with the edge portion of the flexible curtain 02.

The spring 03 in the projection screen 00 may be located at the back of the frame 01, and one end of the spring 03 may be connected to the frame 01 and the other end is connected to the support rod. Here, the spring 03 can be an extension spring, and tension can be applied to the support rod through the extension spring, so that the support rod can apply tension to the flexible curtain 02, and further the front (i.e. the side that needs to present the projection picture) of the flexible curtain 02 has better flatness, so that the display effect of the projection picture presented on the flexible curtain 02 is better.

In general, the frame 01 in the projection screen 00 is a rectangular frame, the number of the support rods in the projection screen 00 is four, the four support rods respectively correspond to four frames in the frame 01 one to one, and each support rod may be located at a position where the corresponding frame is located. The number of the springs 03 connected with each supporting rod in the projection screen 00 is multiple, and the springs 03 connected with the same supporting rod can apply even tension to the supporting rod, so that the supporting rod can tension the flexible curtain 02 from the corresponding frame in the frame 01.

Since each support rod in the projection screen 00 needs to be connected with a plurality of springs 03. Therefore, the number of springs 03 in the projection screen 00 is large. During the assembly of the projection screen 00, an operator needs to apply an elongation force to each spring 03, so that one end of each spring 03 can be connected to the frame 01 and the other end can be connected to the corresponding support rod. However, the process of applying the elongation force to the spring 03 by the operator is complicated, and therefore, when the number of the springs 03 in the projection screen 00 is large, the assembling difficulty of the projection screen 00 is increased, which results in a complicated assembling process of the projection screen 00 and a low assembling efficiency of the projection screen 00.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a projection screen according to an embodiment of the present disclosure. The projection screen 000 may include: frame 100, flexible curtain 200, support rods 300, and tensioning mechanism 400.

The flexible curtain 200 in the projection screen 000 may be attached to the front surface of the frame 100, and the edge portion 200a of the flexible curtain 200 is folded to wrap the edge of the frame 100. For example, please refer to fig. 3, fig. 3 is a schematic structural diagram of a flexible curtain provided in an embodiment of the present application. The flexible curtain 200 can include: a curtain sheet 201 and a flexible carrier 202. The curtain sheet 201 can be fixed on one side of the flexible carrier 202, and the edge portion of the flexible carrier 202 extends out of four side edges of the curtain sheet 2021, which is the edge portion 200a of the flexible curtain 200. The other side of the flexible carrier 202 may fit over the front of the rectangular frame 100 with the edge portions of the flexible carrier 202 folded over to wrap the edges of the rectangular frame 100. Here, the screen 201 may be an optical film, which is used in conjunction with a projection host. 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 201 may be secured to the flexible carrier 202 by adhesive means. For example, the flexible carrier 202 may be a flexible cloth, but may also be another flexible member as long as it can be bent at will and has a certain flatness after being tensioned, which is not limited in this application. It should be noted that an orthographic projection of the flexible carrier 202 on the plane of the curtain sheet 201 covers the curtain sheet 201, so as to ensure that the edge portions of the flexible carrier 202 extend out of four side edges of the curtain sheet 201, and further enable the edge portions of the flexible carrier 202 to be folded to wrap the edges of the rectangular frame 100.

The support rods 300 in the projection screen 000 are located at the rear of the frame 100 and are connected to the edge portions of the flexible curtain 200. For example, referring to fig. 2, after the edge portion of the flexible curtain 200 is folded to wrap the edge of the frame 100, the support bar 300 may be connected to the edge portion of the flexible curtain 200.

To more clearly see the structure of the tensioning mechanism 400 in the projection screen 000, please refer to fig. 2 and 4, and fig. 4 is a schematic structural diagram of a tensioning mechanism provided in the embodiments of the present application. Tensioning mechanism 400 in projection screen 000 may include: a connecting member 401 fixed on the back of the frame 100, a handle member 402 rotatably connected to the connecting member 401, and a hook 403 rotatably connected to the handle member 402.

Wherein the handle member 402 in the tensioning mechanism 400 is configured to: after the hook 403 is engaged with the support bar 300, the hook 403 rotates away from the support bar 300, so that the hook 403 exerts a tightening force on the support bar 300 away from the edge portion 200a of the flexible curtain 200. Here, after the hook 403 in the tensioning mechanism 400 applies a tensioning force to the supporting rod 300, the supporting rod 300 can apply a tensioning force to the flexible curtain 200, so that the front surface of the flexible carrier 202 in the flexible curtain 200 (i.e., the surface of the flexible carrier 202 facing the curtain sheet 201) has a better flatness, so that the display effect of the projection picture presented on the curtain sheet 201 in the flexible curtain 200 is better.

In the embodiment of the present application, please refer to fig. 5, and fig. 5 is a schematic view illustrating a connection relationship among a flexible curtain, a support rod, and a tensioning mechanism according to the embodiment of the present application. When an operator needs to compose the projection screen, firstly, the operator may turn over the edge portion 200a of the flexible curtain 200 to wrap the edge of the frame 100; thereafter, the operator may connect the support bar 300 to the edge portion 200a of the flexible curtain 200; then, the operator can operate the handle member 402 of the tightening mechanism 400 to rotate toward the supporting rod 300, so that the hook 403 of the tightening mechanism 400 can be engaged with the supporting rod 300; finally, the operator can manipulate the handle member 402 of the tensioning mechanism 400 to rotate away from the support rod 300, so that the hook 403 exerts a tensioning force on the support rod 300 away from the edge portion 200a of the flexible curtain 200, so that the support rod 300 can exert a tensioning force on the flexible curtain 200.

In the present application, the operator only needs to control the rotation of the handle 402 in the tightening mechanism 400 to allow the hook 403 in the tightening mechanism 400 to apply a tightening force to the supporting rod 300, without the need for the operator to separately apply an elongation force to the spring. And the force applied by the operator to rotate the grip member 402 is significantly less than the force applied by the operator to elongate the spring. Therefore, the assembling difficulty of the projection screen 000 is low, the assembling process of the projection screen 000 is effectively simplified, and the assembling efficiency of the projection screen 000 can be guaranteed to be high.

In summary, the projection screen provided in the embodiment of the present application includes: frame, flexible curtain, bracing piece and straining device. After pothook and the bracing piece joint in the straining device, the handle spare in the straining device can deviate from the bracing piece and rotate, makes the pothook can exert the tension that deviates from the marginal part of flexible curtain to supporting to make the bracing piece can exert the tension to flexible curtain, make the positive flatness of the flexible carrier in the flexible curtain better, in order to guarantee that the display effect of the projection picture that presents on the curtain in the flexible curtain is better. In the assembling process to the projection screen in this application, operating personnel only need control the handle spare rotation in the straining device, just can let the pothook in the straining device exert the tension to the bracing piece, need not operating personnel and exert extension power to the spring alone. And the force applied by the operator to rotate the handle member is significantly less than the force applied by the operator to elongate the spring. Therefore, the assembling difficulty of the projection screen is low, the assembling process of the projection screen is effectively simplified, and the assembling efficiency of the projection screen can be guaranteed to be high.

In the embodiment of the present application, please refer to fig. 6, and fig. 6 is a schematic structural diagram of another tensioning mechanism provided in the embodiment of the present application. The take-up mechanism 400 may have a first axis 400a and a second axis 400b.

Here, the handle member 402 in the take-up mechanism 400 is rotatable about the first axis 400a with respect to the link member 401; the hook 403 in the tightening mechanism 400 can rotate relative to the grip piece 402 about the second axis 400b. The first axis 400a is parallel to the second axis 400b, and the first axis 400a is closer to the supporting rod 300 than the second axis 400b.

In the present application, when the first axis 400a is closer to the supporting rod 300 than the second axis 400b, the handle member 402 can rotate around the first axis 400a relative to the connecting member 401, and the hook 403 can rotate around the second axis 400b relative to the handle member 402. Therefore, after the hook 403 is clamped with the supporting rod 300 and the handle 402 rotates around the first axis 400a away from the supporting rod 300, a pulling force away from the supporting rod 300 can be applied to the hook 403 through the handle 402, so that the hook 403 can apply a tensioning force to the supporting rod 300.

In the embodiment of the present application, the structure of the tensioning mechanism 400 is various, and the embodiment of the present application is schematically illustrated by taking the following two alternative implementations as examples:

in a first alternative implementation, as shown in fig. 6, the tensioning mechanism 400 may further include: an elastic member 404 located between the handle member 402 and the connecting member 401. Wherein the elastic element 404 may be configured to: compressed as the handle member 402 is rotated away from the frame 100.

In this case, during the assembly of the projection screen 000 by the operator, the operator may apply a lifting force to the handle member 402 such that the handle member 402 can be rotated toward the support rod 300, and at this time, the elastic member 404 between the handle member 402 and the connection member 401 is compressed, and the elastic member 404 may store a repulsive force. Thus, after the hook 403 is engaged with the supporting rod 300 under the operation of the operator, the operator can release the handle 402, and at this time, the elastic element 404 can release the rebound force, and under the action of the rebound force, the handle 402 can automatically depart from the supporting rod 300 to rotate, so that the hook 403 can apply the tension force to the supporting rod 300.

It should be noted that, when the handle member 402 stops rotating, the elastic element 404 between the handle member 402 and the connecting member 401 is still in a slightly compressed state, so that the elastic element 404 can still store a certain elastic force, which balances the tension force applied by the hook 403 to the supporting rod 300. Thus, when the flexible curtain 200 is deflected, the handle 402 can be rotated away from the supporting rod 300 under the elastic force stored in the elastic element 404, so that the hook 403 can tighten the flexible curtain 200 through the supporting rod 300. Thus, even if the flexible curtain 200 deviates, the flatness of the flexible curtain 200 can be ensured to be good.

As an example, the elastic member 404 between the handle member 402 and the connection member 401 may be a torsion spring. For example, referring to fig. 7, fig. 7 is a schematic structural diagram of an elastic element according to an embodiment of the present application, in which the elastic element 404 includes: the spring ring 404a and two connecting rods 404b, the two connecting rods 404b are respectively fixedly connected with two ends of the spring ring 404 a. Here, the two connecting rods 404b in the elastic element 404 may be: a first connecting rod 404b1 and a second connecting rod 404b2.

In the present application, please refer to fig. 8, fig. 8 is a schematic diagram illustrating an elastic element and a connecting member provided in an embodiment of the present application, wherein one connecting rod 404b of two connecting rods 404b in the elastic element 404 may abut against the connecting member 401. For example, the connector 401 may abut against the first connection rod 404b1 in the elastic element 404.

Referring to fig. 9, fig. 9 is a schematic diagram of an embodiment of the present application providing a resilient element and a handle member, wherein the other connecting rod 404b2 of two connecting rods 404b in the resilient element 404 can abut against the handle member 402. For example, the grip piece 402 may abut against the second connecting bar 404b2 in the elastic element 404.

In this case, when the operator applies an upward force to the handle member 402 to rotate the handle member 402 away from the frame 100, the first and second connection bars 404b1 and 404b2 of the elastic member 404 are moved toward each other so that the elastic member 404 can store the repulsive force. Thus, when the operator releases the handle member 402, the first connecting rod 404b1 and the second connecting rod 404b2 of the elastic member 404 can be relatively moved by the elastic force, so that the handle member 402 can be automatically rotated away from the support rod 300.

Alternatively, as shown in fig. 8, the connection member 401 in the tightening mechanism 400 may include: a connector body 401a fixed to the rear surface of the frame 100, and a first shaft 401b connected to the connector body 401 a. Here, the axis of the first rotating shaft 401b is the first axis 400a of the tensioning mechanism 400, and the spring ring 404a of the elastic element 404 can be sleeved on the first rotating shaft 401b.

As shown in fig. 10, fig. 10 is a schematic structural view of a handle part provided in the embodiment of the present application. The handle member 402 may have a first through hole 402a engaged with the first rotation shaft 401b, and the handle member 402 is sleeved on the first rotation shaft 401b through the first through hole 402 a. Here, a gap is formed between the first through hole 402a of the handle member 402 and the first rotating shaft 401b, so that the handle member 402 can rotate around the first rotating shaft 401b through the first through hole 402a, and the handle member 402 can rotate around the first axis 400a of the take-up mechanism 400.

Wherein the connector body 401a in the connector 401 abuts one of the two connecting rods in the elastic element 403. For example, the connector body 401a may abut the first connection rod 404b1 within the resilient element 403.

In the present application, as shown in fig. 8, a connector body 401a in a connector 401 has a circular hole 401a1. Accordingly, a screw hole communicating with the circular hole 401a1 may be provided on the rear surface of the frame 100. In this way, the connection body 401a can be fixed to the back surface of the frame 100 by screwing a screw through the circular hole 401a1 and into the screw hole.

Optionally, as shown in fig. 9, the hook 403 includes: a hook body 403a, and a second rotating shaft 403b fixedly connected with the hook body 403 a. Here, the axis of the second rotating shaft 403b is the second axis 400b.

As shown in fig. 10, the handle member 402 has a second through hole 402b matching with the second rotating shaft 403b, and the handle member is sleeved on the second rotating shaft 403b through the second through hole 402 b. Here, a gap is formed between the second through hole 402b of the handle member 402 and the second rotating shaft 403b, so that the handle member 402 can rotate around the second rotating shaft 401b through the second through hole 402b, and the handle member 402 can rotate around the second axial line 400b of the tightening mechanism 400.

The second rotating shaft 403b abuts against the other of the two connecting rods 404 b. For example, the second rotating shaft 403b may abut against the second connecting rod 404b2 in the elastic member 403. In this manner, the second connecting rod 404b2 in the elastic element 403 can abut against the handle member 402 through the second rotating shaft 403b.

Referring to fig. 11, fig. 11 is a schematic structural diagram of another tensioning mechanism provided in an embodiment of the present application. The handle member 402 in the tightening mechanism 400 may have a plurality of first seizing members C1, and the connecting member 401 in the tightening mechanism 400 has a plurality of second seizing members C2 in one-to-one correspondence with the plurality of first seizing members C1. After the handle 402 is rotated away from the supporting rod 300, each first clamping piece C1 is clamped with the corresponding second clamping piece C2. Through the joint of each first joint piece C1 and the corresponding second joint piece C2, can realize the fastening between connecting piece 401 and the handle piece 402, prevent that tensioning mechanism 400 from exerting the in-process of tightening force to bracing piece 300 through pothook 403, the phenomenon that the handle piece 402 rotates to frame 100 dorsad once more and leads to flexible curtain 200 can not be taut appears.

Under this condition, in the assembly process of operating personnel to projection screen 000, operating personnel can apply the power of lifting to handle piece 402 for handle piece 402 can rotate towards bracing piece 300, and let pothook 403 and bracing piece 300 joint back under operating personnel's the control, operating personnel applies down pressure to handle piece 402, makes handle piece 402 can deviate from bracing piece 300 and rotate, until every first joint spare C1 and the second joint spare C2 joint that corresponds. At this time, through the cooperation of the first clamping piece C1 and the second clamping piece C2, the rotation of the handle piece 402 can be limited, so that the handle piece 402 can apply tension to the hook 403, and further the hook 403 can apply tension to the support rod 300, which is deviated from the edge portion 200a of the flexible curtain 200, so that the support rod 300 can apply tension to the flexible curtain 200.

In the embodiment of the present application, please refer to fig. 12, and fig. 12 is a schematic view illustrating a connection between a handle member and a connecting member according to the embodiment of the present application. One of the first clamping piece C1 in the handle piece 402 and the second clamping piece C2 in the connecting piece 401 is a clamping protrusion, and the other is a clamping groove. For example, when the first clamping piece C1 is a clamping protrusion, the second clamping piece C2 is a clamping groove; when the first clamping piece is a clamping groove, the second clamping piece C2 is a clamping bulge. It should be noted that fig. 11 schematically illustrates an example in which the first clamping member C1 is a clamping protrusion, and the second clamping member C2 is a clamping groove. In this case, the snap projections may be located in the snap recesses after the handle member 402 is rotated away from the support bar 300.

In the embodiment of the application, the clamping protrusion can be an arc protrusion, and the clamping groove can be an arc groove. For example, the clamping protrusion may be a circular arc protrusion, and the clamping groove may be a circular arc groove. Therefore, when the handle part 402 needs to rotate away from the support rod 300, the clamping protrusion can slide into the clamping groove more conveniently; when the handle member 402 is required to rotate toward the support rod 300, the clamping protrusion can more conveniently slide out of the clamping groove.

In the embodiment of the present application, as shown in fig. 13, fig. 13 is a partially enlarged view of a projection screen at a rear edge according to the embodiment of the present application. The flexible curtain 200 has a plurality of edge portions 200a, and each edge portion 200a has a plurality of receiving pockets U each having an opening O into which the support rod 300 enters. Thus, the support rod 300 may be inserted into the receiving pocket U from the opening O of each receiving pocket U, so that the support rod 300 may be connected with each receiving pocket U.

In the present application, the number of the tension members 400 in the projection screen 000 is plural, and after the hooks 403 in the plural tension members 400 are all clamped with the supporting rod 300, the clamping position of each hook 403 with the supporting rod 300 is located between two adjacent accommodating pockets U. Thus, the connection position of the hook 403 and the supporting rod 300 is not provided with the accommodating pocket U, so that the tension applied to the supporting rod 300 by the hook 403 is not interfered by the accommodating pocket U.

It should be noted that the frame 100 in the projection screen 000 in the present application is a rectangular frame, and the rectangular frame is composed of four frames connected end to end in sequence. The number of the supporting rods 300 in the projection screen 000 is four, and the four supporting rods 300 may correspond to four frames in the frame 100 one to one, and each supporting rod 300 may be disposed at a position where the corresponding frame is located. The flexible curtain 200 is also a rectangular curtain, and the flexible curtain 200 has four edge portions 200a corresponding to the four support rods 300 one to one and four frames one to one, and each edge portion 200a in the flexible curtain 200 can be connected to the corresponding support rod 300 after being turned over to wrap the corresponding frame in the frame 100. A plurality of tightening mechanisms 400 can be fixed on each frame in the frame 200, and the hooks 403 of the tightening mechanisms 400 on the same frame can be simultaneously clamped with the support rods 300 corresponding to the frame.

In summary, the projection screen provided in the embodiment of the present application includes: frame, flexible curtain, bracing piece and straining device. After pothook and the bracing piece joint in the straining device, the handle spare in the straining device can deviate from the bracing piece and rotate, makes the pothook can apply the tension that deviates from the marginal part of flexible curtain to the bracing piece to make the bracing piece can apply the tension to flexible curtain, make the positive flatness of the flexible carrier in the flexible curtain better, in order to guarantee that the display effect of the projection picture that presents on the curtain in the flexible curtain is better. In the assembling process to the projection screen in this application, operating personnel only need control the handle spare rotation in the straining device, just can let the pothook in the straining device exert the tension to the bracing piece, need not operating personnel and exert extension power to the spring alone. The force applied by the operator to rotate the handle member is significantly less than the force applied by the operator to elongate the spring. Therefore, the assembling difficulty of the projection screen is lower, the assembling process of the projection screen is effectively simplified, and the assembling efficiency of the projection screen can be guaranteed to be higher.

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 to be exemplary only, and not to limit the present application, and any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included therein.

Claims (10)

1. A projection screen, comprising: the device comprises a frame, a flexible curtain, a support rod and a tensioning mechanism;

the flexible curtain is attached to the front face of the frame, and the edge part of the flexible curtain is folded to wrap the edge of the frame;

the supporting rod is positioned on the back of the frame and is connected with the edge part of the flexible curtain;

the tensioning mechanism comprises: the connecting piece is fixed on the back of the frame, the handle piece is rotationally connected with the connecting piece, and the clamping hook is rotationally connected with the handle piece;

wherein the handle piece is configured to: after the clamping hook is clamped with the supporting rod, the clamping hook deviates from the supporting rod to rotate, so that the clamping hook exerts tension force deviating from the edge part of the flexible curtain on the supporting rod.

2. The projection screen of claim 1 wherein the tensioning mechanism has a first axis about which the handle member is rotatable relative to the connector and a second axis about which the catch is rotatable relative to the handle member;

wherein the first axis is parallel to the second axis, and the first axis is closer to the support rod than the second axis.

3. The projection screen of claim 2 wherein the tensioning mechanism further comprises: a resilient element located between the handle piece and the connector, the resilient element configured to: compressed as the handle member is rotated toward the support rod.

4. The projection screen of claim 3 wherein the resilient element comprises: the two connecting rods are respectively and fixedly connected with two ends of the spring ring;

wherein, one connecting rod in two connecting rods with the connecting piece butt, another connecting rod with handle spare butt.

5. The projection screen of claim 4, wherein the connector comprises: the connecting piece body is fixed on the back face of the frame, the first rotating shaft is connected with the connecting piece body, the axial lead of the first rotating shaft is the first axial lead, and the spring ring is sleeved on the first rotating shaft;

the handle part is provided with a first through hole matched with the first rotating shaft, and the handle part is sleeved on the first rotating shaft through the first through hole;

wherein, the connecting piece body with one connecting rod butt in two connecting rods.

6. The projection screen of claim 4, wherein the catch comprises: the clamping hook body and a second rotating shaft fixedly connected with the clamping hook body are arranged, and the axial lead of the second rotating shaft is the second axial lead;

the handle part is provided with a second through hole matched with the second rotating shaft, and the handle part is sleeved on the second rotating shaft through the second through hole;

wherein the second rotating shaft is abutted against the other connecting rod of the two connecting rods.

7. The projection screen of claim 2, wherein the handle member has a plurality of first snap members, and the connecting member has a plurality of second snap members in one-to-one correspondence with the plurality of first snap members;

wherein, the handle spare deviates from the bracing piece rotates the back, every first joint spare and the second joint spare joint that corresponds.

8. The projection screen of claim 7, wherein one of the first and second snap-in members is a snap-in projection and the other is a snap-in groove;

wherein, the handle spare deviates from the bracing piece rotates the back, the joint is protruding to be located in the joint recess.

9. The projection screen of claim 8, wherein the snap fit projection is an arcuate projection and the snap fit recess is an arcuate recess.

10. The projection screen of any one of claims 1 to 9, wherein the flexible curtain has a plurality of the edge portions, each of the edge portions having a plurality of receiving pockets, each of the receiving pockets having an opening for the support rod to enter;

the number of taut part in the projection screen is a plurality of, and is a plurality of pothook in the taut part all with behind the bracing piece joint, every the pothook with the joint position of bracing piece is located two adjacent between the holding pocket.

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