CN112198748A

CN112198748A - Projection screen and projection equipment

Info

Publication number: CN112198748A
Application number: CN202011239411.8A
Authority: CN
Inventors: 逄相来
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2021-01-08
Anticipated expiration: 2040-11-09
Also published as: CN112198748B; WO2022095990A1

Abstract

The application provides a projection screen and projection equipment, which relate to the technical field of projection, wherein a support frame is used for supporting a projection screen sheet and is provided with a first extension part, a second extension part and a third extension part, wherein the projection screen sheet is supported on the first extension part; the third extending part is far away from the projection screen and forms a notch with the projection screen; the second extension part is used for connecting the first extension part and the third extension part; the flexible connecting part is at least connected with the edge of the projection screen and winds to the back side of the first extending part; and the first end of the fixing piece is connected with the third extending part, and the second end of the fixing piece is connected with the flexible connecting part so as to tension the projection screen. The application can be used in a projection device.

Description

Projection screen and projection equipment

Technical Field

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

Background

With the continuous development of science and technology, projection devices are increasingly applied to the work and life of people, a projection screen is an important component of the projection device, the projection screen is used for receiving light beams projected by a projector to form a projection picture, the projection screen comprises an optical structure layer, and particularly when the projection device is applied to ultra-short-focus projection, the requirements on the flatness and the deformation of a light receiving surface of the projection screen are strict, and meanwhile, with the increase of the projection size, the structure of the projection screen needs to be simplified and fixed and the fixed installation structure is not heavy due to the increase of the size.

Disclosure of Invention

The embodiment of the application provides a projection screen and projection equipment, which are used for solving the problem of poor supporting effect of the projection screen in the related art.

To achieve the above object, in a first aspect, embodiments of the present application provide a projection screen, the projection screen receiving illumination of a projection beam;

the supporting frame is a hollow rectangular frame, and the cross section of the supporting frame is provided with a first extension part, a second extension part and a third extension part;

the projection screen is supported on the first extending part;

the third extending part is far away from the projection screen and forms a notch with the projection screen;

the second extension part is used for connecting the first extension part and the third extension part;

the flexible connecting part is at least connected with the edge of the projection screen and winds to the back side of the first extending part;

and the first end of the fixing piece is connected with the third extending part, and the second end of the fixing piece is connected with the flexible connecting part so as to tension the projection screen.

In a second aspect, embodiments of the present application provide a projection apparatus comprising a projection machine and the projection screen of the first aspect, the projection machine being configured to project a projection beam onto a projection screen of the projection screen to form a projected image.

The projection screen provided by the embodiment of the application is of a rectangular frame structure and is composed of three extension parts, the first extension part is used for providing a bearing support for the projection screen, the projection screen is connected with the flexible connecting part, the flexible connecting part is wound to the back side of the supporting frame and is fixedly connected to the third extension part through the fixing part, and therefore the projection screen is stretched and fixed.

Meanwhile, the third extending part and the projection screen form a notch which can be used for installing a support frame or a projection screen, so that the fixed installation of the projection screen and the installation structure of the whole projection screen can be shared, and the structure of the support frame can be greatly simplified.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1A is a rear view of a projection screen of the related art;

FIG. 1B is a cross-sectional view M-M of FIG. 1A;

FIG. 1C is an enlarged partial view of the lower end of the projection screen of FIG. 1B;

FIG. 2 is a cross-sectional view of the support frame of FIG. 1B;

FIG. 3 is a schematic diagram of a projection device according to some embodiments of the present disclosure;

FIG. 4A is a backside view of a projection screen in some embodiments of the present application;

FIG. 4B is a cross-sectional view N-N of FIG. 4A;

FIG. 4C is an exploded view of the projection screen of FIG. 4A;

FIG. 4D is an enlarged partial view of the lower end of the projection screen of FIG. 4B;

FIG. 5 is a longitudinal cross-sectional view of a projection screen in some embodiments of the present application;

FIG. 6 is a partial enlarged view of the lower end (circled portion) of the projection screen of FIG. 5;

FIG. 7 is a comparison of the dimensions of the support frame of FIG. 6 and a support frame of the related art;

FIG. 8 is a longitudinal cross-sectional view of a projection screen in other embodiments of the present application;

FIG. 9 is an enlarged partial view of the lower end (portion within the circle in the figure) of the projection screen shown in FIG. 8;

FIG. 10 is a schematic structural view of the supporting frame in FIG. 9;

FIG. 11 is a schematic view of a flexible screen according to some embodiments of the present application;

FIG. 12 is an exploded view of a support frame and a decorative frame of a projection screen according to some embodiments of the present application;

FIG. 13 is a rear side view of a projection screen according to some embodiments of the present application with a decorative frame removed;

FIG. 14 is a rear side view of a projection screen according to other embodiments of the present application with a decorative frame removed;

FIG. 15 is a backside view of a projection screen in some embodiments of the present application;

FIG. 16 is a schematic view of the projection screen of FIG. 15 with the decorative frame removed;

FIG. 17 is an enlarged partial view of a corner of the support frame of FIG. 16;

FIG. 18 is a schematic structural diagram of the first side frame of FIG. 16;

FIG. 19 is an enlarged partial view of the end of the first side frame shown in FIG. 18;

FIG. 20 is an enlarged partial view of the upper right corner of the projection screen of FIG. 15;

FIG. 21 is a cross-sectional view D-D of FIG. 15;

FIG. 22 is an enlarged partial view of the lower end of the projection screen of FIG. 21;

FIG. 23 is a diagram showing a state before and after adjustment of a projected image on a projection screen according to an embodiment of the present application in the case where pincushion distortion occurs;

fig. 24 is a diagram showing a state before and after adjustment of a projection image on a projection screen in an embodiment of the present application when barrel distortion occurs.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the term "coupled" may refer to a direct connection, an indirect connection through intervening media, or a connection between two elements; the specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Referring to fig. 1A, 1B, 1C and 2, fig. 1A is a rear view of a projection screen in a related art, fig. 1B is a sectional view of M-M in fig. 1A, fig. 1C is a partially enlarged view of a lower end of the projection screen in fig. 1B, and fig. 2 is a sectional view of a support frame in fig. 1B. The projection screen comprises a support frame 1, a fixing part 2, a projection screen 3, a third extending part 15 and a flexible connecting part 4, wherein a hanging part 10 is arranged on the back side of the support frame 1, the hanging part 10 is arranged between the inner edge 11a and the outer edge 11b of the support frame 1, the third extending part 15 is arranged at the inner edge 11a of the support frame 1 and can be connected with a hanging part 300, so that the support frame 1 is installed on an installation carrier 400, and the installation carrier 400 is a wall body.

The projection screen 3 is located at the front side of the support frame 1, the flexible connecting portion 4 is connected with the projection screen 3, and the edge portion 41 of the flexible connecting portion 4 is wound from the outer edge 11b to the back side of the support frame 1. The fixing member 2 is located on the back side of the supporting frame 1, and a first end of the fixing member 2 is connected to the hanging portion 10, and a second end of the fixing member is connected to the edge portion 41 of the flexible connecting portion 4, so as to tension the projection screen 3.

In the projection screen, as shown in fig. 1C, the hanging part 10 is required to be disposed on the support frame 1 to connect the first end of the fixing part 2, and the hanging part 10 is disposed on the support frame 1, which is not beneficial to simplifying the structure of the support frame 1 and reducing the manufacturing cost; meanwhile, as shown in fig. 2, the hanging portion 10 is disposed at a position between the third extending portion 15 and the outer edge 11b of the supporting frame 1, a certain distance D exists between the hanging portion 10 and the third extending portion 15, and the existence of the distance D causes a larger bezel dimension D1 of the projection screen and a larger bezel dimension D1 of the projection screen, so that the bending resistance of the supporting frame 1 is weaker, and the supporting frame 1 is more likely to generate a larger bending deformation under the tensile force of the fixing member 2, which affects the flatness of the projection screen 3, thereby reducing the display effect of the projection screen.

Fig. 3 is a schematic structural diagram of a projection apparatus according to some embodiments of the present disclosure, as shown in fig. 3. The projection device comprises a projector 200 and a projection screen 100, wherein the projection screen 100 is positioned obliquely above the projector 200 and used for receiving the projection light beam, the projector 200 is placed on a flat placing surface, the projector 200 comprises a casing 210 and supporting feet 220 arranged at the bottom of the casing 210, and the bottom of the supporting feet 220 can be made of rubber materials so as to increase the friction force between the supporting feet 220 and the placing surface; the top end of the housing 210 is provided with a projection opening 230, and when the projector 200 works, the projection light beam is projected onto the projection screen 100 through the projection opening 230 to form a projection image for a user to watch.

Fig. 4A is a back side view of the projection screen 100 according to some embodiments of the present application, fig. 4B is a cross-sectional view N-N of fig. 4A, fig. 4C is an exploded view of the projection screen 100 of fig. 4A, and fig. 4D is a partial enlarged view of the lower end of the projection screen of fig. 4B. The projection screen 100 includes a support frame 1, a third extending portion 15, a fixing member 2, a projection screen 3, a flexible connecting portion 4, and a decoration frame 5. The cross section of the support frame 1 is a hollow rectangle 11 c. The edge of the support frame 1 near the central opening 11c is an inner edge 11a, and the edge far from the central opening 11c is an outer edge 11 b.

As shown in fig. 4D, the projection screen 3 is located on the front side of the support frame 1, the flexible connecting portion 4 is connected to the projection screen 3, and the edge portion 41 of the flexible connecting portion 4 is wound from the outer edge 11b of the support frame 1 to the back side of the support frame 1.

Wherein, flexible connection portion 4 is flexible cloth, and projection curtain piece 3 is whole to be laminated on flexible cloth. The front side of the support frame 1 refers to the viewing side of the user for viewing the projected picture on the projection screen 3, i.e. side a in fig. 4D; the back side of the support frame 1 is the side of the support frame 1 away from the projection screen 3, i.e. side B in fig. 4D.

In the embodiment of the present application, the support frame is a hollow rectangular frame, which can be seen in fig. 6, and has a cross section having a first extension 13, a second extension 14 and a third extension 15.

Wherein the first extension 13 is disposed at the outer edge 11b of the support frame 1 and the third extension 15 is disposed at the inner edge 11a of the support frame 1.

The second extension portion 14 extends toward the back side of the support frame 1 for connecting the first extension portion 14 and the third extension portion 15.

In one embodiment, the second extension portion 14 is perpendicular to the plane of the projection screen 3, so as to ensure that each position of the projection screen 3 and the first extension portion 13 has a close bearing relationship.

As shown in fig. 11, fig. 11 is a schematic structural view of the projection screen 3 and the flexible connecting portion 4 in fig. 4D being attached to each other. The flexible connecting portion 4 includes an adhesive layer 43, a flexible supporting layer 44, and a waterproof layer 45, which are sequentially stacked, and the adhesive layer 43 is adhered to the projection screen 3. The flexible bearing layer 44 mainly plays a role of bearing the adhesive layer 43 and the waterproof layer 45, and the flexible bearing layer 44 can be made of a material which is easy to bend and has a certain tensile strength, so that the overall outer contour of the flexible connecting part 4 is not greatly changed under the tensile force of the fixing part 2. The waterproof layer 45 is used to prevent external moisture from infiltrating into the adhesive layer 43, so as to prevent the projection screen 3 from adhesive failure.

The projection screen 3 includes a light-exiting surface protection layer 31, a light-projecting layer 32, a micro-mirror layer 33, and a light-shielding layer 34, which are sequentially stacked, wherein the light-shielding layer 34 is bonded to the bonding layer 43. The light-exiting surface protection layer 31 mainly protects the light-projecting layer 32 and the micro-mirror layer 33. The primary function of the micromirror layer 33 is to diffuse the light projected from the projector. The light shielding layer 34 mainly serves to block light, increase the reflectivity of the micromirror layer 33, and prevent light beam from passing through the projection screen 3.

The projection screen 3 may be a hard screen or a soft screen, and is not limited herein. In addition to the projection screen 3 being integrally attached to the flexible sheet, the flexible sheet may also be connected to the edge of the projection screen 2, which also enables tensioning of the projection screen 3. The flexible connecting portion 4 may be a flexible cloth, or a connecting rope connected to the edge of the projection screen 2, and the type of the flexible connecting portion 4 may be determined according to the actual situation.

As shown in fig. 4B, 4C and 4D, the third extending portion 15 is disposed at the inner edge 11a of the supporting frame 1, the third extending portion 15 is connected to the hanging member 300 to mount the supporting frame 1 on the mounting carrier 400, and the mounting carrier 400 is a wall. Of course, the mounting carrier 400 may be other carriers capable of carrying the support frame 1 besides the wall, and is not limited in particular. As shown in fig. 4D, the fixing member 2 is located on the back side of the supporting frame 1, and the first end of the fixing member 2 is connected to the third extending portion 15, and the second end is connected to the edge portion 41 of the flexible connecting portion 4 to tension the projection screen 3.

Wherein, the edge part 41 of the flexible connecting part 4 forms a closed shape 42, the rigid rod a is arranged in the closed shape 42 in a penetrating way, and the second end of the fixing part 2 is connected with the rigid rod a. Of course, instead of being connected to the edge portion 41 by the rigid rod a, the second end of the fixing member 2 may be directly connected to the edge portion 41.

In this embodiment, the first end of the fixing member 2 is connected to the third extending portion 15 disposed at the end of the second extending portion 14 far from the supporting frame 1, so that the fixing member 2 can be disposed obliquely relative to the projection screen 3, and the tensioning force F provided by the fixing member 2 and the projection screen 3 can form an acute angle θ, which is beneficial to reducing the pressure applied by the flexible connecting portion 4 to the outer edge 11b of the supporting frame 1, and further beneficial to reducing the friction between the flexible connecting portion 4 and the outer edge 11b of the supporting frame 1, and the friction between the flexible connecting portion 4 and the outer edge 11b of the supporting frame 1 is reduced, so that the loss of the tensioning force F can be reduced, and the tensioning effect of the projection screen 3 can be improved.

Fig. 6 is a schematic cross-sectional view of a portion of the support frame of fig. 5.

As shown in fig. 6, the third extending portion 15 is located on a side of the second extending portion 14 close to the central opening 11c, and has a first end connected to the second extending portion 14 and a second end as a free end. The first extension 13 is a supporting surface of the projection screen, and the third extension 15 is far away from the projection screen 3 and forms a notch structure 11d with the projection screen 3.

The first end of the fixing member 2 is connected with the second end of the third extending portion b, and specifically, the first end can be clamped with the edge of the second end, or riveted or screwed. Meanwhile, a part of the hanging member 300 is fixedly connected to the mounting carrier 400, and a part of the hanging member extends into the front side of the third extending portion b, i.e. can be inserted into the notch structure 11d to be clamped with the supporting frame 2, so that the supporting frame 1 is mounted on the mounting carrier 400, for example, hung on a wall.

The fixing member 2 may be a plurality of elastic tension members, such as a hanging spring, but is not limited thereto, and other members capable of providing tension may also be used, and are not limited herein.

In some embodiments, as shown in fig. 8, 9 and 10, fig. 8 is a longitudinal sectional view of a projection screen 100 according to other embodiments of the present application, fig. 9 is a partially enlarged view of a lower end (a portion within a circle) of the projection screen shown in fig. 8, and fig. 10 is a structural view of the support frame 1 shown in fig. 9. A reinforcing member 16 is fixedly arranged at a corner formed by the first extending portion 13 and the second extending portion 14. By providing the reinforcement member 16, the bending strength of the first extension portion 13 can be increased, and the first extension portion 13 is less prone to bending deformation under the tension of the fixing member 2, thereby being more beneficial to ensuring the flatness of the projection screen 3.

As shown in fig. 10, the reinforcing member 16 includes a first reinforcing plate 161 and a second reinforcing plate 162 connected in an L shape, and the first reinforcing plate 161 is fixedly connected to the first extending portion 13 and the second extending portion 14. Of course, the reinforcing member 16 is not limited to the above structure, and for example, the reinforcing member 16 may be a triangular reinforcing rib having a shape matching the shape of the corner formed by the first extending portion 13 and the second extending portion 14.

In some embodiments, as shown in fig. 9 and 10, the flange 17 extending to the back side of the support frame 1 is provided at the outer edge 11b of the support frame 1 and at the free end side of the first extension portion 13, and the edge portion 41 of the flexible connecting portion 4 is wound from the flange 17 to the back side of the support frame 1; a side surface of the flange 17 near the edge portion 41 is a curved surface 171, and the curved surface 171 is engaged with the curved portion of the edge portion 41. By providing the flange 17 and the curved surface 171 of the flange 17 engaging with the curved portion of the edge portion 41, the flexible connecting portion 4 can be brought into smooth contact with the support frame 1, and damage to the flexible connecting portion 4 due to a corner at the outer edge 11b of the support frame 1 can be avoided.

In this embodiment, the third extending portion 15 is disposed at the inner edge 11a of the supporting frame 1, the first end of the fixing member 2 is connected to the third extending portion 15, so that the fixing member 2 and the hanging member 300 are both connected to the third extending portion 15, that is, the structure for connecting the hanging member 300 to the supporting frame 1 and the structure for connecting the fixing member 2 are combined into one, so that the structure for connecting the fixing member 2 does not need to be additionally disposed on the supporting frame 1, thereby greatly simplifying the structure on the supporting frame 1, and facilitating to reduce the manufacturing cost.

Meanwhile, as shown in fig. 6 and 7, fig. 7 is a size comparison diagram of the supporting frame 1 in fig. 6 and the supporting frame 1 in the related art. In the projection screen 100, since the first end of the fixing member 2 is connected to the third extending portion 15, and the third extending portion 15 is located at the inner edge 11a of the supporting frame 1, under the condition that other conditions are not changed (i.e. the structural parameters of the fixing member 2, the projection screen 3, the flexible connecting portion 4, the third extending portion 15, etc. are not changed), the frame size D2 of the supporting frame 1 can be shortened by a distance D (i.e. the distance between the hanging part 10 and the third extending part 15) compared with the size D1 of the supporting frame 1 in the related art, the size of the frame of the support frame 1 is shortened, so that the bending resistance of the support frame 1 can be increased, the support frame 1 is not easy to bend and deform under the action of the tensile force of the fixing piece 2, therefore, the smoothness of the projection screen 3 can be improved, and the display effect of the projection picture on the projection screen 3 can be further improved.

In some embodiments, the fixing member 2 may be plural and disposed at least at the upper and lower positions of the supporting frame.

Alternatively, the second end of the fixing member 2 is shaped to fit the rigid rod a, to form a snap fit with the rigid rod, and to form a riveting, a snap fit, a screw fixation with the third extending portion 15, so as to provide a fixed tension, unlike the elastic tension member, which can adjust the tension.

In some embodiments, as shown in fig. 9 and 12, fig. 12 is an exploded view of the support frame 1 and the decorative frame 5 of the projection screen 100 in some embodiments of the present application. In this embodiment, the supporting frame 1 has a rectangular frame structure, and includes two first side frames 18 spaced apart from each other along the first direction X, and two second side frames 19 spaced apart from each other along the second direction Y, and the inner edge 11a of the first side frame 18 is provided with a third extending portion 15; wherein, the first direction X, the second direction Y and the thickness direction of the projection screen 3 are perpendicular to each other. Of course, the support frame 1 may have other shapes besides rectangular, such as circular, hexagonal, pentagonal, etc., which may be determined according to actual situations.

The edge portion 41 of the flexible connecting portion 4 includes a first edge portion 411, and the first edge portion 411 is wound from the outer edge 11b of the first side frame 18 to the back side of the first side frame 18; the fixing member 2 includes a first fixing member 21 located at the back side of the first side frame 18, a first end of the first fixing member 21 is connected to the third extending portion 15 located on the first side frame 18, and a second end is connected to the first edge 411, so as to tension the projection screen 3 in the first direction X.

When the projection screen 100 is in use, the projection screen 100 is vertically placed so that the first direction X is parallel to the vertical direction, and at this time, the projection screen 3 is easily deformed by gravity, for example, the projection screen 3 bulges toward the front side of the support frame 1. By disposing the first fixing member 21 on the back side of the first side frame 18, and connecting the first end of the first fixing member 21 with the third extending portion 15 on the first side frame 18, and connecting the second end with the first edge 411, the first fixing member 21 can tension the projection screen 3 in the first direction X, so as to eliminate the deformation of the projection screen 3 under the action of gravity, thereby maintaining the flatness of the projection screen 3.

In some embodiments, as shown in fig. 13 and 14, fig. 13 is a back side view of projection screen 100 of some embodiments of the present application with decorative frame 5 removed, and fig. 14 is a back side view of projection screen 100 of other embodiments of the present application with decorative frame 5 removed. The projection screen 100 shown in fig. 13 and 14 differs from the projection screen 100 shown in fig. 12 mainly in that the fixing member 2 includes a second fixing member 22 in addition to the first fixing member 21; the edge portion 41 of the flexible connecting portion 4 comprises, in addition to the first edge portion 411, a second edge portion 412, as described in detail below:

the edge portion 41 of the flexible connecting portion 4 further includes a second edge portion 412, and the second edge portion 412 is wound from the outer edge 11b of the second side frame 19 to the back side of the second side frame 19; the fixing member 2 further includes a second fixing member 22 disposed on the back side of the second side frame 19, wherein a first end of the second fixing member 22 is connected to the third extending portion 15 disposed on the second side frame 19, and a second end of the second fixing member 22 is connected to the second edge portion 412, so as to tension the projection screen 3 in the second direction Y.

In this embodiment, not only the first fixing member 21 can tension the projection screen 3 in the first direction X, but also the second fixing member 22 can tension the projection screen 3 in the second direction Y, so that the projection screen 3 is more flat and the display effect of the projection screen is ensured.

As shown in fig. 13, the number of the first fixing members 21 is multiple, and the multiple first fixing members 21 are arranged at intervals along the second direction Y, so that the tensioning force applied to the projection screen 3 in the second direction Y is relatively uniform; the number of the second fixing members 22 is plural, and the plural second fixing members 22 are arranged at intervals along the first direction X, so that the tension force applied to the projection screen 3 in the first direction X is ensured to be uniform.

In some embodiments, as shown in fig. 12, the projection screen 100 further includes a support bar 121, and the support bar 121 is detachably disposed between the two first side frames 18. By arranging the supporting bar 121 between the two first side frames 18, the supporting bar 121 can support the two first side frames 18, and the first side frames 18 can be prevented from being deformed greatly. Meanwhile, since the supporting bars 121 are detachably disposed between the two first side frames 18, the deformation of the first side frames 18 can be adjusted by replacing the supporting bars 121 with different lengths, for example, when the first side frame 18 on the upper side bends downward, the original supporting bars 121 can be replaced by the supporting bars 121 with longer lengths, so as to prop up the first side frame 18 on the upper side, and prevent the first side frame 18 from bending and deforming downward.

As shown in fig. 12, the number of the supporting bars 121 is plural, and each supporting bar 121 is detachably disposed between two first side frames 18, so that the deformation of the first side frames 18 can be better adjusted. The end of the supporting bar 121 can be connected to the first side frame 18 by screws, but is not limited thereto, and other detachable connection methods are possible.

In some embodiments, as shown in fig. 9, the supporting bars 121 and the flexible connecting portions 4 (i.e., the flexible cloth) have a gap 6 with a width of a preset value m therebetween. Through setting up this clearance 6, the assembly that can make projection curtain piece 3 and flexible connecting portion 4 form like this has certain deflection to the dorsal part, can compensate projection curtain piece 3, flexible connecting portion 4 because of the produced deflection of expend with heat and contract with cold well, avoids the stress that produces because of expend with heat and contract with cold when flexible connecting portion 4 and support bar 121 paste too tightly to take place to damage.

The preset value m is the maximum value of the allowable deformation of the combined body formed by the projection screen 3 and the flexible connecting part 4 in the normal use state.

In some embodiments, as shown in fig. 15, 16 and 17, fig. 15 is a back side view of the projection screen 100 according to some embodiments of the present application, fig. 16 is a schematic view of the projection screen 100 of fig. 15 with the decorative frame 5 removed, and fig. 17 is a partial enlarged view of a corner of the support frame 1 of fig. 16.

The projection screen 100 further comprises a first connecting piece 122, a first fastening piece 123a and a second fastening piece 123b, the first connecting piece 122 is arranged at a corner formed by the first side frame 18 and the second side frame 19, the first connecting piece 123a is detachably connected with the first side frame 18, and the second connecting piece 123b is detachably connected with the second side frame 19, so that the first side frame 18 and the second side frame 19 can be detached by detaching the first connecting piece 122, and the first side frame 18 and the second side frame 19 are greatly convenient to repair and replace.

As shown in fig. 17, 18, and 19, fig. 18 is a schematic structural view of the first side frame 18 in fig. 16, and fig. 19 is a partially enlarged view of an end portion of the first side frame 18 shown in fig. 18. The first fastener 123a and the second fastener 123b may each be a threaded fastener, such as a screw. The first connecting member 122 has a first through hole 1221 and a second through hole 1222, the end of the first side frame 18 has a first threaded hole 181, the end of the second side frame 19 has a second threaded hole 191, the first fastening member 123a passes through the first through hole 1221 to be engaged with the first threaded hole 181, and the second fastening member 123b passes through the second through hole 1222 to be engaged with the second threaded hole 191.

The first fastening member 123a and the second fastening member 123b may be screws or bolts, and are not limited herein; the number of the first through holes 1221, the first threaded holes 181, the second through holes 1222, the second threaded holes 191, the first fastening members 123a, and the second fastening members 123b may be one or more, and is not particularly limited herein.

In some embodiments, as shown in fig. 9, the decoration frame 5 has a slot 51, the outer edge 11b of the support frame 1 extends into the slot 51, and the decoration frame 5 mainly shields the outer edge 11b area of the support frame 1 and a part of the area of the rear side of the support frame 1, so as to beautify the appearance and improve the visual experience of the user.

In some embodiments, as shown in fig. 12 and 15, the decoration frame 5 includes two first sub decoration frames 52 spaced apart along the first direction X, and two second sub decoration frames 53 spaced apart along the second direction Y.

Each first sub decorative frame 52 has a first engaging groove 521, and along the first direction X, two ends of the supporting frame 1 respectively extend into the first engaging grooves 521 of the two first sub decorative frames 52, that is, each first side frame 18 extends into the first engaging groove 521 of the corresponding first sub decorative frame 52.

Each second sub decorative frame 53 has a second engaging groove 531, and along the second direction Y, the two ends of the supporting frame 1 respectively extend into the second engaging grooves 531 of the two second sub decorative frames 53, that is, each second side frame 19 extends into the second engaging groove 531 of the corresponding second sub decorative frame 53.

As shown in fig. 16 and 17, the projection screen 100 further includes a second connector 124, a third fastener 123c, a fourth fastener 123d, and a fifth fastener 123e, the second connector 124 is disposed at a corner formed by the first sub decorative frame 52 and the second sub decorative frame 53, and the second connector 124 is detachably connected to the first sub decorative frame 52 through the third fastener 123c, detachably connected to the second sub decorative frame 53 through the fourth fastener 123d, and detachably connected to the support frame 1 through the fifth fastener 123 e.

During assembly, the two first sub decorative frames 52 are respectively clamped at two ends of the supporting frame 1 along the first direction X, the two second sub decorative frames 53 are respectively clamped at two ends of the supporting frame 1 along the second direction Y, and then the first sub decorative frame 52, the second sub decorative frame 53 and the supporting frame 1 are detachably connected together through the second connecting piece 124. Therefore, the assembly of the decoration frame 5 and the support frame 1 is facilitated, the first sub decoration frame 52 or the second sub decoration frame 53 can be conveniently disassembled, assembled and replaced, and the maintenance cost of the decoration frame 5 is reduced.

As shown in fig. 15 to 22, fig. 20 is a partial enlarged view of the upper right corner of the projection screen in fig. 15, fig. 21 is a cross-sectional view taken along line D-D in fig. 15, and fig. 22 is a partial enlarged view of the lower end of the projection screen 100 in fig. 21. The third fastener 123c, the fourth fastener 123d, and the fifth fastener 123e are all threaded fasteners.

As shown in fig. 17 and 20, a third through hole 522 is formed at an end of the first sub decorative frame 52, a fourth through hole 532 is formed at an end of the second sub decorative frame 53, a third threaded hole 1241 and a fourth threaded hole 1242 are formed on the second connecting member 124, the third fastening member 123c passes through the third through hole 522 to be matched with the third threaded hole 1241, and the fourth fastening member 123d passes through the fourth through hole 532 to be matched with the fourth threaded hole 1242.

As shown in fig. 17 and 20, the second connecting member 124 further has a fifth through hole 1243 and a sixth through hole 1244, the first side frame 18 has a fifth threaded hole 182, the second side frame 19 has a sixth threaded hole 192, the fifth fastening member 123e includes a first sub-fastening member 1231 and a second sub-fastening member 1232, the first sub-fastening member 1231 passes through the fifth through hole 1243 to be engaged with the fifth threaded hole 182, and the second sub-fastening member 1232 passes through the sixth through hole 1244 to be engaged with the sixth threaded hole 192.

The third fastener 123c, the fourth fastener 123d, the first sub-fastener 1231, and the second sub-fastener 1232 may be all screws or all bolts, and are not limited herein; the number of the third fastener 123c, the fourth fastener 123d, the first sub-fastener 1231, and the second sub-fastener 1232 may be one or more, and is not particularly limited herein. .

In some embodiments, as shown in fig. 15, 16 and 18, the projection screen 100 further includes a third connector 7, a fourth connector 8, a sixth fastener, a seventh fastener, an eighth fastener and a ninth fastener (not shown), the third connector 7 is disposed in the middle of the first side frame 18 and detachably connected to the first side frame 18 through the sixth fastener, and the fourth connector 8 is disposed in the middle of the second side frame 19 and detachably connected to the second side frame 19 through the seventh fastener.

The first sub deco-frame 52 is detachably connected to the third connection member 7 by an eighth fastening member, and the second sub deco-frame 53 is detachably connected to the fourth connection member 8 by a ninth fastening member.

Wherein, the middle part of the first side frame 18 refers to the parts except the two ends of the first side frame 18; the middle portion of the second side frame 19 means a portion excluding both ends of the second side frame 19.

Through the above-mentioned setting, can prevent like this that the relative first side frame 18 in middle part of first sub-dress trim 52 from taking place great deformation, prevent that the relative second side frame 19 in middle part of the sub-dress trim 53 of second from taking place great deformation, thereby can make and decorate 5 and support fixed more firm between the frame 1, and simultaneously, because third connecting piece 7 and first sub-dress trim 52, first side frame 18 all can be dismantled and connected, fourth connecting piece 8 and the sub-dress trim 53 of second, all can be dismantled and connected to second side frame 19, the dismouting of first sub-dress trim 52 with first side frame 18 has been made things convenient for like this, and the dismouting of second sub-dress trim 53 and second side frame 19.

The sixth fastener, the seventh fastener, the eighth fastener and the ninth fastener may be all screws or all bolts, and are not particularly limited herein.

The embodiment of the present application further provides a method for adjusting the projection screen 100, which is applied to the projection screen of the above embodiment. As shown in fig. 13 and 14, the projection screen 100 is in an operating state, in which the first direction X is parallel to the vertical direction, that is, the two first side frames 18 are disposed in the vertical direction, and the two second side frames 19 are disposed in the horizontal direction.

In the course of use of the projection screen 100, the projection screen 3 is inevitably deformed by gravity, which results in distortion of the projected image. If the projection screen 3 is deformed to bulge forward, the projected picture will have pincushion distortion, i.e. the boundary of the projected picture is concave toward the side near the center. If the projection screen 3 is deformed to be concave toward the rear side, the projection screen is distorted in a cylindrical shape, that is, the boundary of the projection screen is convex toward the side away from the center.

In order to eliminate the distortion of the projected image caused by the deformation of the projection screen 3, it is possible to adjust the number of the first fixing members 21:

if pincushion distortion occurs in the projected image at the first position near the support frame 1, the number of the first fixing members 21 at the first position is increased. By increasing the number of the first fixing members 21 at the first position, it is possible to increase the tension to the projection screen 3, eliminate the deformation of the projection screen 3 bulging to the front side at the first position, and eliminate the occurrence of pincushion distortion of the projected image at the first position.

For example, as shown in fig. 14, if the first position is at a corner (for example, the upper left corner) of the supporting frame 1, the number of the first fixing members 21 at the corner of the supporting frame 1 is increased to two from the original one. Of course, in order to better eliminate the deformation of the projection screen 3 at the corner of the supporting frame 1, the number of the second fixing members 22 at the corner may be increased from one to two.

If the projected image at the second position near the support frame 1 is distorted in a cylindrical shape, the number of the first fixing members 21 at the second position is reduced. By reducing the number of the first fixing members 21 at the second position, it is possible to reduce the tension to the projection screen 3, eliminate the deformation of the projection screen 3 dented to the rear side at the second position, and eliminate the occurrence of the cylindrical distortion of the projected image at the second position.

For example, as shown in fig. 13, if the second position is at a corner (for example, an upper left corner) of the supporting frame 1, the number of the first fixing members 21 at the corner of the supporting frame 1 is reduced, and the number of the first fixing members 21 is reduced from two to one. Of course, in order to better eliminate the deformation of the projection screen 3 at the corners of the supporting frame 1, the number of the second fixing members 22 at the corners may be reduced from two to one.

In addition to the above-mentioned adjustment of the number of the fixing members 2 to eliminate the distortion of the projected image caused by the deformation of the projection screen 3, the length of the supporting bars 121 can be adjusted to eliminate the distortion of the projected image caused by the deformation of the projection screen 3.

When the projected image at the first position close to the support frame 1 is pincushion distorted, the first support stay 1211 is provided at the first position so that the first side frame 18 is deformed in a direction away from the center opening 11 c. For example, as shown in fig. 23, fig. 23 is a state diagram of the projection image on the projection screen 100 in the embodiment of the present application before and after adjustment when pincushion distortion occurs. In the figure, a solid line is a contour line of the projection screen 3, a broken line located on the upper side is an upper boundary of the projection image, and a broken line extending in the vertical direction is a contour line of the first support stay 1211. As shown in fig. 23 (a), the projected image is pincushion distorted at a position (first position) close to the upper first side frame 18. As shown in fig. 23 (b), the first support bead 1211 having a long length is replaced between the two first side frames 18, the first support bead 1211 pushes up the upper first side frame 18, and the first side frame 18 is deformed to a side away from the central opening 11c of the support frame 1, so as to increase the tension of the projection screen 3, thereby eliminating the deformation of the projection screen 3 that bulges to the front side, and further eliminating the occurrence of pincushion distortion of the projection image at the first position.

If the projected image at the second position near the support frame 1 is barrel-distorted, the second support bars 1212 are provided at the second position to deform the first side frames 18 in a direction near the central opening 11 c. For example, as shown in fig. 24, fig. 24 is a state diagram of the projection image on the projection screen 100 in the embodiment of the present application before and after adjustment when barrel distortion occurs. In the figure, a solid line is a contour line of the projection screen 3, a dotted line on the upper side is an upper boundary of the projection image, and a dotted line extending in the vertical direction is a contour line of the second support bar 1212. As shown in fig. 24 (a), the projected image is distorted in a cylindrical shape at a position (second position) near the upper first side frame 18. As shown in fig. 24 (b), the second support bar 1212 having a shorter length is disposed between the two first side frames 18, and the upper first side frame 18 is deformed toward the side closer to the center of the support frame 1 to reduce the tension on the projection screen 3, so as to eliminate the deformation of the projection screen 3 that is dented toward the rear side, thereby eliminating the occurrence of the cylindrical distortion of the projection image at the second position.

The supporting strip 121 includes a first supporting strip 1211 and a second supporting strip 1212, the first supporting strip 1211 is detachably disposed between the two first side frames 18, and the second supporting strip 1212 is detachably disposed between the two first side frames 18;

in the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A projection screen, comprising:

a projection screen for receiving the illumination of the projection beam;

the supporting frame is a hollow rectangular frame, the cross section of the supporting frame is provided with a first extension part, a second extension part and a third extension part,

the projection screen sheet is supported on the first extending part;

the flexible connecting part is at least connected with the edge of the projection screen sheet and is wound to the back side of the first extending part;

2. The projection screen of claim 1,

a second extension part extending to a back side of the support frame; and the second extension part is vertical to the plane of the projection screen.

3. The projection screen of claim 1,

the first end of the third extending part is connected with the second extending part, the second end is a free end,

the first end of the fixing piece is connected with the second end of the third extending part.

4. The projection screen of claim 1,

the notch is used for installing the support frame on a mounting carrier.

5. The projection screen of claim 2,

one end of the first extending part is provided with a flange; the flange has a curved surface.

6. The projection screen of any one of claims 1 to 5,

the fixing piece is at least arranged on the upper frame and the lower frame of the rectangular frame of the supporting frame, and the fixing pieces are multiple.

7. The projection screen of claim 6,

the fixing piece is an elastic tension piece.

8. The projection screen of claim 1, wherein an end of the flexible connecting portion connected to the fixing member has a closed shape with a rigid rod inserted therein, and a second end of the fixing member is connected to the rigid rod.

9. The projection screen of claim 8, wherein the second end of the anchor is shaped to fit over and engage the rigid rod.

10. The projection screen of any one of claims 1-5, wherein a thickness of the first extension and a corner of the second extension have a stiffener.

11. The projection screen of any one of claims 1 to 5,

the flexible connecting part is flexible cloth, and at least the edge of the projection screen piece is attached to the flexible cloth.

12. A projection device, comprising:

the projection screen of any one of claims 1 to 11;

a projector to project a projection beam onto a projection screen of the projection screen to form a projected image.

13. The projection device of claim 12, wherein the projection screen is a Fresnel optical film,

the projector is an ultra-short-focus projection device.