Curtain and projection curtain device

Abstract

The utility model relates to a curtain and a projection curtain device, and mainly relates to the technical field of projection. The curtain is provided with two oppositely-spaced first side edges and two oppositely-spaced second side edges, the two ends of each second side edge are connected to the two first side edges respectively, and the curtain can be wound to be in a rolled state or can be unfolded to be in a tiled state. In the rolling state, the curtain is provided with a rolling shaft axis. In the tiled state, the two first side edges are sequentially arranged side by side in the extending direction of the axis of the reel, the contour line of each first side edge is an arc line, the two ends of the arc line are connected to the two second side edges respectively, and the arc line is sunken towards the central area of the curtain. According to the curtain, the first side edge with the contour line being the arc line is arranged, so that the phenomenon that the curtain is unfolded and curled during use can be improved, the flatness of the curtain is improved, and the projection effect is improved.

Description

Technical Field

[0001] This application relates to the field of projection technology, and in particular to a screen and a projection screen device. Background Technology

[0002] In the field of projection technology, images are typically projected onto a projection screen using projection equipment for user viewing. Because projection screens are relatively bulky during use and prolonged exposure to air can affect their lifespan, they are usually kept closed (rolled up) when not in use to protect them. However, when a screen is rolled up for extended periods, it is prone to edge curling when unfolded, meaning the edges of the screen will curl forward to some extent, thus affecting the projection quality and the user experience. Utility Model Content

[0003] In view of this, the present invention provides a screen that can improve the curling phenomenon, thereby solving the above-mentioned technical problems.

[0004] In a first aspect, embodiments of this application provide a screen having two relatively spaced first sides and two relatively spaced second sides, with each end of the second side connected to the two first sides respectively. The screen can be rolled up to be in a rolled-up state or unfolded to be in a laid-out state. In the rolled-up state, the screen has a roller axis. In the laid-out state, the two first sides are arranged side-by-side in the direction extending from the roller axis. The outline of the first side is an arc, with each end of the arc connected to the two second sides respectively, and the arc is concave towards the central area of ​​the screen.

[0005] In some embodiments, the arc is a circular arc.

[0006] In some embodiments, the arch height of the arc is greater than or equal to 1 mm and less than or equal to 5 mm.

[0007] In some embodiments, the screen includes a substrate layer and a reflective layer, the substrate layer having a first surface and a second surface facing away from each other, and the reflective layer covering the first surface.

[0008] In some embodiments, the curtain further includes a support layer that covers the second surface.

[0009] The reflective layer includes a reflective coating, and the support layer includes a reflective coating and / or a light-shielding coating.

[0010] In some embodiments, the thickness of the reflective layer is the same as the thickness of the support layer.

[0011] In some embodiments, the thickness of the substrate layer is greater than or equal to 0.15 mm and less than or equal to 0.25 mm, and the thickness of the reflective layer is greater than or equal to 0.2 mm and less than or equal to 0.3 mm.

[0012] In some embodiments, the substrate layer includes multiple warp braided threads and multiple weft braided threads, which are woven together to form the substrate layer.

[0013] In some embodiments, each warp braid contains a first number of polyester threads. Each weft braid contains a second number of polyester threads, and the ratio of the first number to the second number is greater than or equal to 1 and less than or equal to 6. The weft braids extend in the same direction as the axis of the spool.

[0014] In some embodiments, the first quantity is in the range of [2, 6], the second quantity is in the range of [1, 2], and each warp braid is wound into a strand by the first quantity of polyester yarn; when the second quantity is equal to 2, each weft braid is wound into a strand by 2 polyester yarns.

[0015] In some embodiments, multiple warp braided threads are arranged side-by-side with intervals according to a first spacing, and multiple weft braided threads are arranged side-by-side with intervals according to a second spacing, wherein the first spacing is smaller than the second spacing.

[0016] Secondly, embodiments of this application also provide a projection screen device, which includes a screen as described above and a winding mechanism, wherein the winding mechanism is connected to the screen for winding up the screen.

[0017] Compared to existing technologies, the screen provided in this application can be in a rolled-up state and a flat-lay state, thereby providing a larger projection area when the screen is in use and saving storage space when stored. The screen has two relatively spaced first sides and two relatively spaced second sides, with each end of each second side connected to the two first sides, forming a symmetrical structure, which to a certain extent maintains the stability and flatness of the screen when unfolded. Furthermore, the outline of the first side is curved. When the screen is unfolded by external force and is in a stretched state, the curved first side generates tension away from the concave direction of the curve (i.e., away from the center area of ​​the screen), thereby reducing edge curling. In addition, the curve makes the tension distribution of the first side more uniform, improving the flatness of the screen, thereby improving the projection effect and the user experience. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the curtain in a flat state according to an embodiment of this application.

[0020] Figure 2 This is a schematic diagram of the structure of the curtain in the rolled-up state according to an embodiment of this application.

[0021] Figure 3 This is a schematic diagram of the structure of a projection screen device provided in one embodiment of this application.

[0022] Figure 4 This is another structural schematic diagram of a projection screen device provided in one embodiment of this application.

[0023] Figure 5 yes Figure 1 A partial structural schematic diagram of the cross-section of the curtain shown.

[0024] Figure 6 yes Figure 5 A schematic diagram of the woven structure of the substrate layer of the curtain shown.

[0025] Figure 7 yes Figure 1 A partial structural diagram of another cross-section of the curtain shown. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that when a component / part is said to be "fixed to" another component / part, it can be directly on the other component / part or there may be an intermediate component / part. When a component / part is considered to be "connected to" another component / part, it can be directly connected to the other component / part or there may be an intermediate component / part present; also, when a component / part is considered to be "connected to" another component / part, it can be integrally formed or assembled with the other component / part. When a component / part is considered to be "set on" another component / part, it can be directly set on the other component / part or there may be an intermediate component / part present.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] Please see Figure 1 and Figure 2 This application provides a screen 100, which serves as a receiving surface to receive light from a projection device so that a user can view the projected image. The screen 100 can be applied to home theaters, educational venues, entertainment venues, etc., depending on the received projected content; this embodiment does not impose specific limitations. As an example only, the screen 100 can be installed in a vehicle to receive projected images from a vehicle-mounted projector, thereby improving the user's viewing experience inside the vehicle.

[0030] In this embodiment, the curtain 100 can be rolled up to be in a rolled-up state (e.g., Figure 2 (as shown) or can be expanded (such as) Figure 1 As shown, the screen 100 is laid flat, thus providing a larger projection area 1002 when in use and saving storage space when stored. It should be noted that in this embodiment, the screen 100 is not subject to external forces (such as tension or gravity) when it is laid flat. For example, when the screen 100 is laid out horizontally (such as laid flat on the ground), it can present a flat and wrinkle-free state.

[0031] Please see Figure 3 and Figure 4To facilitate the unfolding and storage of the screen 100, this embodiment also provides a projection screen device 200, which includes a winding mechanism 210 and the aforementioned screen 100. The winding mechanism 210 is connected to the screen 100 to facilitate the winding or unfolding of the screen 100. Specifically, the winding mechanism 210 may include a winding shaft 2101 and a drive mechanism 2102 connected to the winding shaft 2101. One side of the screen 100 is connected to the winding shaft 2101. When the drive mechanism 2102 drives the winding shaft 2101 to rotate, the screen 100 follows the rotation of the winding shaft 2101 and is in a wound state or an unfolded state (wherein, the flat state includes the unfolded state). It should be noted that the curtain 100 can be fixedly connected to the take-up shaft 2101 or detachably connected to the take-up shaft 2101. For example, one side of the curtain 100 can be snapped into a snap-fit ​​groove (not shown in the figure) on the take-up shaft 2101 to facilitate the maintenance and cleaning of the curtain 100. The drive mechanism 2102 can be an electric take-up mechanism, such as a drive motor; the drive mechanism 2102 can also be a manual take-up mechanism, such as a pull ring. This embodiment does not impose specific limitations on this.

[0032] This embodiment does not limit the specific installation location of the retracting mechanism 210. For example, it can be installed on a wall or ceiling, depending on actual usage requirements. As an example only, when the screen 100 is used as a vehicle screen 100, the retracting mechanism 210 can be installed on the roof of the vehicle so that the screen 100 can be fully unfolded to increase the projection area 1002. It is understood that the retracting mechanism 210 can also be installed in other locations inside the vehicle body, and this embodiment does not impose specific limitations on this.

[0033] In some embodiments, the screen 100 may be rolled up without the retracting mechanism 210. For example, when using the screen 100, the user can manually unfold the screen 100 and fix it to a support such as a wall or ceiling by means of magnetic attraction or hanging so that the user can watch the movie. After watching the movie, the user can manually roll up the screen 100.

[0034] Please see Figure 1 and Figure 2In this embodiment, the curtain 100 has two relatively spaced first sides 10 and two relatively spaced second sides 20, with each second side 20 connected to the two first sides 10 at both ends. The curtain 100 can be rolled up to be in a rolled-up state or unfolded to be in a laid-out state. In the rolled-up state, the curtain 100 has a roll axis O. In the laid-out state, the two first sides 10 are arranged side by side in the direction of extension of the roll axis O. The outline of the first side 10 is an arc 11, with each end of the arc 11 connected to the two second sides 20. The arc 11 is recessed toward the center region 1001 of the curtain 100. In this embodiment, the curtain 100 being in a laid-out state means that the curtain 100 is unfolded and presents a flat, wrinkle-free, uncurled, or unbent state. In the laid-out state, the curtain 100 is almost unaffected by external pulling forces. A typical scenario in which the curtain 100 is in a laid-out state is, for example, the curtain 100 being laid flat on a horizontal surface. Figure 1 As shown. The curtain 100 being in a flat or rolled-up state means that the curtain 100 is roughly rolled up around one of its second sides 20 as an axis, forming a roughly cylindrical shape. The rolling axis O is the axis of this cylinder. Figure 2 As shown.

[0035] In this embodiment, by setting two relatively spaced first side edges 10 and two relatively spaced second side edges 20, with each end of the second side edge 20 connected to the two first side edges 10 respectively, a symmetrical structure is formed, which to some extent maintains the stability and flatness of the curtain 100 when unfolded. In this embodiment, when the curtain 100 is unfolded and stretched by an external force (see [reference]...), Figure 4 For example, when the winding mechanism 210 applies a pulling force to the two second sides 20 of the screen 100, any point on the screen 100 is subjected to forces in four directions. The vertical direction (i.e., the extension direction of the first side 10) is subjected to pulling forces Fg1 and Fg2 from the winding mechanism 210, which are balanced forces. The horizontal direction is subjected to tensions Fh1 and Fh2 in opposite directions, with Fh1 pointing towards the center region 1001 of the screen 100. The closer to the center region 1001, the more balanced Fh1 and Fh2 become. The first side 10 is away from the center region 1001, and the forces acting on the first side 10 are more balanced by setting its outline as an arc 11. Specifically, when the screen is subjected to the external force applied by the winding mechanism 210, the first side 10 of the arc 11 shape generates tension away from the concave direction of the arc 11 (that is, away from the direction of the central region 1001 of the screen 100) to compensate for Fh2, and makes the compensated Fh2 and Fh1 tend to be balanced, thereby reducing the curling phenomenon. In addition, the arc 11 makes the tension distribution of the first side 10 more uniform, improves the flatness of the screen 100, thereby improving the projection effect and the user experience.

[0036] Next, we will introduce each component of the screen 100 and its specific structure.

[0037] Please see Figure 3 and Figure 4 In this embodiment, the two first sides 10 and two second sides 20 of the curtain 100 are connected to each other to form the outline of the curtain 100. Specifically, the two first sides 10 are spaced apart, and the two second sides 20 are spaced apart. The two ends of each second side 20 are connected to the two first sides 10, that is, the two ends of each first side 10 are connected to the two second sides 20. Thus, when the curtain 100 is unfolded and laid flat, it is roughly a rectangular plane, which helps to maintain a relatively uniform force in all directions and to a certain extent maintains the flatness of the curtain 100 when unfolded. As an example, when the curtain 100 is in an unfolded and laid-flat state and is set along the direction of gravity, the first sides 10 can be set along the direction of gravity, and the second sides 20 can be set perpendicular to the direction of gravity.

[0038] In this embodiment, the second side 20 can be either a straight line or an arc, and this embodiment does not impose any specific limitations on it. As an example, the second side 20 can be an arc, and the curvature of the arc 11 can be relatively small to ensure that the screen 100 has a large projection area. As another example, the second side 20 can extend along a straight line.

[0039] When the curtain 100 is in a suspended state, the second side 20 is used to fix and support the curtain 100. For example, one of the second sides 20 is used to connect to the winding shaft 2101 of the winding mechanism 210 so that the winding mechanism 210 can wind up or unwind the curtain 100 or magnetically attach or suspend it to the support. In some embodiments, the second side 20 may be provided with a counterweight (not shown) to prevent curling. For example, the counterweight may be a metal strip connected to the second side 20 and arranged along the extending direction of the second side 20, so that when the curtain 100 is unfolded and laid flat, it is in a stretched state, which can effectively prevent the curtain 100 from curling and reduce the vibration or shaking of the curtain 100 during use, maintaining the flatness of the curtain 100. At the same time, the metal strip also plays a role in supporting and guiding the curtain 100 to be wound, reducing wrinkles caused by improper winding, and helping to maintain the flatness of the curtain 100.

[0040] In some embodiments, the second side 20 may be provided with a light-shielding element (not shown) to improve the projection effect. Specifically, the second side 20 may be provided with a black or dark-colored light-shielding layer to reduce interference from ambient light and enhance the image contrast of the screen 100, making the projected pattern on the screen 100 more vivid and clear. The light-shielding layer may specifically be a light-shielding strip, light-shielding paper, or other light-shielding element; this embodiment does not impose specific limitations on this.

[0041] In this embodiment, the first side 10 serves as the outline of both sides of the screen 100 and connects with the second side 20 to jointly define the area of ​​the screen 100. There are two first side 10s. Specifically, the two first side 10s can be the left and right sides of the screen 100 in its unfolded state. That is, when the screen 100 is rolled up, it has a roll axis O, and the extension direction of the roll axis O is parallel to the extension direction of the second side 20. When the screen 100 is laid flat, the two first side 10s are arranged side-by-side in the extension direction of the roll axis O. This embodiment does not limit the specific length of the first side 10 and the second side 20, i.e., the area of ​​the screen 100, and can be set according to actual usage requirements.

[0042] Please refer to it again. Figure 1 and Figure 3 Because the screen 100 may deform and curl during prolonged use, in order to improve the flatness of the screen 100, in this embodiment, the first side 10 can be configured as an arc structure, that is, the outline of the first side 10 is an arc 11. The two ends of the arc 11 are respectively connected to the two second sides 20. The arc 11 can be recessed towards the central area 1001 of the screen 100, so that when the screen 100 is in a taut or stretched state, the arc 11 can deform to reduce the curling phenomenon and improve the flatness of the screen 100. The central area 1001 can be understood as the area where the geometric center of the screen 100 is located. Specifically, when an external force is applied to the screen 100 to make the screen 100 in an unfolded and stretched state, the closer to the central area 1001 of the screen 100, the more balanced the force. Since the first side 10 is set away from the central area 1001, the unbalanced force on the first side 10 easily forms curling towards the central area 1001. The external force can be a vertical (i.e., perpendicular to the second side) pulling force applied by the retracting mechanism 210 to the second side 20 of the curtain 100, or it can be manually stretched by the user. In a flat and taut state (e.g., a pulling force perpendicular to the second side 20 is applied to the second side 20), tension is generated away from the curling direction during the straightening process of the arc 11, so that the force on the first side 10 is more balanced, presenting a state without curling.

[0043] In this embodiment, the arc 11 can specifically be a circular arc. A circular arc has symmetry and consistent curvature, which can prevent localized stress concentration on the first side 10 during the straightening process of the arc 11, resulting in a more uniform tension distribution, further reducing curling and maintaining the flatness of the screen 100 when unfolded. It should be noted that in some embodiments, the arc 11 can also be other curves with a peak or trough, thereby simplifying the production of the screen 100 while ensuring the prevention of curling. For example, it can be a parabola constrained by a parabolic function, and the arc 11 can also be one of the curves constrained by a hyperbolic function. In some embodiments, the arc 11 can include multiple arc segments, which are sequentially connected to form the first side 10. This allows for more uniform stress at any position on the first side 10 during the straightening process, thus maintaining the overall shape and flatness of the screen 100. This embodiment does not impose a specific limit on the number of arcs 11, which can be set according to actual usage requirements.

[0044] In this embodiment, since the outline of the first side 10 is an arc, in order to ensure that the screen 100 has a large projection area 1002 to ensure the user experience, the curvature of the arc can be small, that is, the degree of bending is small, so that the first side 10 is an approximately straight curve to ensure the projection area 1002 of the screen 100. As a specific example, the arch height H of the arc is set to be greater than or equal to 1mm and less than or equal to 5mm. The arc within this height range can better improve the curling problem when stretched and deformed, and at the same time, it can also make the projection area 1002 of the screen 100 larger, thereby improving the projection effect and the user experience. Further, as a specific example, the arch height of the arc is set to be greater than or equal to 1mm and less than or equal to 3mm. As an example, the arch height of the arc can be set to 1mm, 2mm, 3mm or other values ​​that meet the above range, which can be set according to actual usage needs. This embodiment does not impose specific limitations on this. The "arch height H" can be specifically understood as the perpendicular distance from the vertex (midpoint) of the arc to the two endpoints of the arc, defined by the virtual line segments. Figure 1 As shown.

[0045] Please see Figure 5In this embodiment, the screen 100 may include a substrate layer 30, which serves as the body of the screen 100 and provides stability so that the screen 100 remains flat when unfolded. In this embodiment, the substrate layer 30 has a first surface 301 and a second surface 302 facing away from each other. In the unfolded state, both the first surface 301 and the second surface 302 are planar to facilitate the presentation of the projected pattern, thereby improving the user experience. The substrate layer 30 is configured with a certain degree of toughness and a rollable structure. For example, the substrate layer 30 may include at least one of a fiberglass layer, a plastic layer, a woven fabric layer, etc., and this embodiment does not impose specific limitations. As an example, the substrate layer 30 may include a woven fabric layer to give the screen 100 good flexibility and flatness for better roll-up and unfolding, and the woven fabric layer has good durability, which helps to improve the service life of the screen 100.

[0046] Furthermore, the woven layer can specifically be a polyester woven layer, that is, the substrate layer 30 can include multiple warp braids 32 and multiple weft braids 33. The multiple warp braids 32 and multiple weft braids 33 are woven together to form the substrate layer 30, which can improve the strength and durability of the curtain 100 on the one hand, and give the curtain 100 good wrinkle resistance and good elasticity on the other hand, so as to improve the curling phenomenon and maintain the flatness of the curtain 100 in the unfolded and laid-out state.

[0047] Please see Figure 4 and Figure 6 Specifically, each warp braid 32 and each weft braid 33 may include multiple polyester threads 31 to improve the structural strength of the substrate layer 30. In other embodiments, each warp braid 32 and each weft braid 33 may also be composed of a single polyester thread 31. This embodiment does not limit the specific number of polyester threads 31 included in the warp braid 32 and the specific number of polyester threads 31 included in the weft braid 33, and can be set according to actual usage requirements.

[0048] In this embodiment, the direction of the warp braiding thread 32 intersects the direction of the weft braiding thread 33, for example, they are basically perpendicular. The warp braiding thread 32 can be understood as a longitudinal line, that is, the extension direction of the warp braiding thread 32 is basically the same as the extension direction of the first side 10. The weft braiding thread 33 can be understood as a transverse line, that is, the extension direction of the weft braiding thread 33 is basically the same as the extension direction of the second side 20, that is, the extension direction of the weft braiding thread 33 is the same as the extension direction of the spool axis O. This embodiment does not impose specific restrictions on the number of warp braiding threads 32, the number of weft braiding threads 33, or the braiding method of the warp braiding thread 32 and the weft braiding thread 33.

[0049] To ensure the flatness of the curtain 100 and improve edge curling, in this embodiment, the substrate layer 30 can be configured to have lower elasticity along the warp direction Y (i.e., the extension direction of the warp weave 32) and higher elasticity along the weft direction X (i.e., the extension direction of the weft weave 33). Specifically, when the curtain 100 is rolled up or unrolled by the winding mechanism 210, the winding length is fixed, for example, the winding length can be the distance between the two second sides 20 (i.e., the length of the first side 10 or the length of the curtain 100 along the warp direction Y). When the substrate layer 30 has lower elasticity along the warp direction Y, it can prevent the curtain 100 from being overstretched and deformed, resulting in incomplete winding. When the substrate layer 30 has higher elasticity along the weft direction X (i.e., the direction approximately parallel to the second side 20), it helps to provide good elasticity to the arc 11 of the first side 10 when it is straightened, thereby improving the edge curling phenomenon. In this embodiment, the elasticity of the substrate layer 30 can be adjusted by adjusting the number of polyester threads 31, the density distribution of polyester threads 31, and the spacing between adjacent polyester threads 31.

[0050] As an example, when each warp braid 32 is composed of multiple polyester threads 31, and each weft braid 33 is composed of one or more polyester threads 31, the number of polyester threads 31 in each group of warp braids 32 and the number of polyester threads 31 in each group of weft braids 33 can be adjusted so that the substrate layer 30 has less elasticity in the extension direction of the warp braid 32 (i.e., the extension direction of the first side 10) and more elasticity in the extension direction of the weft braid 33 (i.e., the extension direction of the second side 20). Specifically, each warp braid 32 includes a first number of polyester threads 31, and each weft braid 33 includes a second number of polyester threads 31. The first number is greater than the first quantity, making each set of warp braids 32 more robust and less prone to deformation, with less elasticity to ensure that the curtain 100 does not stretch excessively. Conversely, each weft braid 33 is more prone to deformation and has greater elasticity than the warp braids 32, ensuring that the curved lines 11 can straighten under their own elasticity when the curtain 100 is unfolded and laid flat, thus improving the curling effect. As an example only, the ratio of the first quantity to the second quantity is greater than or equal to 1 and less than or equal to 6. For example, the first quantity can be 6, meaning each warp braid 32 includes 6 polyester threads 31, and the second quantity can be 1, meaning each weft braid 33 includes 1 polyester thread 31. More specifically, in some embodiments, the value range of the first quantity can be greater than or equal to 2 and less than or equal to 6, and the value range of the second quantity can be greater than or equal to 1 and less than or equal to 2. For example, the first quantity can be 5, the second quantity can be 2, etc. It is understood that the first quantity and the second quantity can also be other values, which can be set according to actual usage needs. This embodiment does not impose specific limitations.

[0051] Furthermore, in some embodiments, to further enhance the strength of each warp braid 32, a first number of polyester threads 31 can be wound along the warp direction Y to form a single strand. This tightly secures multiple polyester threads 31 within each warp braid 32, resulting in a smaller gap between adjacent polyester threads 31, thus reducing deformability and elasticity. This further prevents excessive elongation of the curtain 100 and improves its stability during roll-up. Similarly, in some embodiments, to improve the structural strength of the substrate layer 30, provided the first side 10 has good elasticity (i.e., when the second number equals 2), two polyester threads 31 can be wound along the weft direction X to form a single strand, thereby enhancing the structural strength of the substrate layer 30. In other embodiments, the strength of the substrate layer 30 can also be improved by tightly arranging multiple polyester threads 31 side-by-side to form a single weft braid 33 / warp braid 32.

[0052] As another example, the spacing d1 between adjacent warp braids 32 and the spacing d2 between adjacent weft braids 33 can be set to meet certain requirements so that the substrate layer 30 has less elasticity along the warp direction Y (i.e., the extension direction of the first side 10) and more elasticity along the weft direction X (i.e., the extension direction of the second side 20). Specifically, the first spacing d1 between two adjacent warp braids 32 is smaller than the second spacing d2 between two adjacent weft braids 33, so that the polyester threads 31 in the warp direction Y are arranged more densely, that is, more robustly, and less elastic, thereby further preventing the curtain 100 from over-stretching and improving the stability of the curtain 100 when rolled up. On the other hand, the polyester threads 31 in the weft direction X are arranged more sparsely, that is, more easily deformed and more elastic, to ensure that the first side 10 (arc 11) can be straightened under its own elasticity when the curtain 100 is unfolded and laid flat, thereby improving the curling phenomenon.

[0053] Furthermore, in other embodiments, when each warp braid 32 includes a plurality of polyester threads 31 and each weft braid 33 includes two polyester threads 31, the spacing between two adjacent polyester threads 31 in each warp braid 32 can be smaller than the spacing between two polyester threads 31 in the weft braid 32, thereby making the arrangement of polyester threads 31 in the warp direction Y more dense and stronger, and less elastic.

[0054] It is understandable that the number of polyester threads 31 included in different warp braids 32, the spacing between adjacent polyester threads 31 in each warp braid 32, the spacing between two adjacent warp braids 32, and the arrangement density of the warp braids 32 in different areas of the screen 100 are all roughly the same. Similarly, the weft braids 33 also have the above characteristics, thereby improving the uniformity of reflected light to ensure the projection effect.

[0055] Please refer to it again. Figure 5 In this embodiment, the screen 100 further includes a reflective layer 40, which covers one surface of the substrate layer 30, for example, the reflective layer 40 covers the first surface 301 of the substrate layer 30, to improve the reflectivity of the screen 100 for projected light or projected images. In this embodiment, the reflective layer 40 is a flexible layer to facilitate the rolling and unfolding of the screen 100. As an example, the reflective layer 40 may specifically include at least one of a reflective film layer and a reflective coating layer. For example, the reflective layer 40 may include a reflective film layer, which may specifically be a metal thin film layer to have good reflectivity. As another example, the reflective layer 40 may include a reflective coating layer, such as a reflective paint layer, which is the reflective layer 40 formed after the reflective paint has cured.

[0056] To further improve the reflection efficiency and light uniformity of the reflective layer 40, in some embodiments, the reflective layer 40 may further include microstructures 41. Microstructures 41 may be disposed on the surface of the reflective layer 40. For example, microstructures 41 may be beaded structures, with multiple beaded structures arranged on the surface of the reflective layer 40 opposite to the substrate layer 30. This allows light received by the screen 100 to be reflected or diffused at the beaded structures, thereby improving reflection efficiency. It is understood that microstructures 41 may also be other textured structures, such as scale structures, honeycomb structures, etc., and this embodiment does not limit this. Microstructures 41 may also be scattering particles embedded in the reflective layer 40, so that light partially transmitted through the reflective layer 40 is reflected when it comes into contact with the scattering particles, further improving reflection efficiency.

[0057] Please see Figure 7 In some embodiments, the projection screen 100 may further include a support layer 50, which covers the second surface 302 of the substrate layer 30 to balance the reflective layer 40, thereby balancing the forces on the first surface 301 and the second surface 302 of the substrate layer 30, further improving the flatness of the projection screen 100 in its unfolded state and preventing curling. In some embodiments, the area, thickness, and weight of the support layer 50 may be the same as those of the reflective layer 40. The support layer 50 may include at least one of the aforementioned reflective film layer and reflective coating layer, that is, the support layer 50 and the reflective layer 40 may serve as backups for each other, so that in the event of damage to the reflective layer 40, the support layer 50 can also act as the reflective layer 40 to reflect light, thereby improving the reliability and service life of the projection screen 100.

[0058] In another embodiment, the support layer 50 may further include a light-shielding coating. The thickness and weight of the light-shielding layer are approximately the same as those of the reflective layer 40. The light-shielding coating may specifically be a light-shielding paint, such as pigment or paint, and this embodiment does not impose specific limitations on it. For example, the light-shielding coating may be formed by curing black ink to form a light-shielding layer, or by doping carbon black particles into an optical adhesive to form a light-shielding film layer.

[0059] In another embodiment, the support layer 50 can also be a flexible light-shielding element, such as black or dark-colored light-shielding cloth. By setting the light-shielding layer, on the one hand, the reflective layer 40 can be balanced, further improving the flatness of the screen 100 in the unfolded and laid-out state and preventing edge curling; on the other hand, the light-shielding layer can absorb interfering light from the direction away from the reflective layer 40, thereby reducing light spots and glare caused by ambient light and improving the projection effect.

[0060] In another embodiment, the support layer 50 may include both a light-shielding coating and a reflective coating. As an example, one surface of the reflective coating is attached to the surface of the substrate layer 30 opposite to the reflective layer 40, while the light-shielding coating is attached outside the reflective coating. This allows the support layer 50 to reflect some of the light that has penetrated the reflective layer 40 again to improve reflection efficiency, and also to absorb ambient stray light to improve projection effects. It is understood that when the support layer 50 includes both a light-shielding coating and a reflective coating, the total thickness and weight of the light-shielding and reflective coatings are approximately the same as those of the reflective layer 40.

[0061] In this embodiment, to avoid an excessively large winding radius of the screen 100 during winding, reduce the space occupied by the screen 100 during winding, and improve the winding and unfolding efficiency of the screen 100, the thickness of the reflective layer 40 can be set to be greater than or equal to 0.2 mm and less than or equal to 0.3 mm, and the thickness of the substrate layer 30 can be set to be greater than or equal to 0.15 mm and less than or equal to 0.25 mm. As an example, the thickness of the reflective layer 40 can be 0.2 mm, 0.25 mm, 0.3 mm, or other values ​​within the above range, and the thickness of the substrate layer 30 can be 0.15 mm, 0.2 mm, 0.25 mm, or other values ​​within the above range. These can be set according to actual usage requirements, and this embodiment does not impose any limitations on them. It should be noted that when the reflective layer 40 is multi-layered, the total thickness of the reflective layer 40 is set to be greater than or equal to 0.2 mm and less than or equal to 0.3 mm. For example, when the reflective layer 40 includes at least one reflective film layer and at least one reflective coating layer, the total thickness of the at least one reflective film layer and at least one reflective coating layer is greater than or equal to 0.2 mm and less than or equal to 0.3 mm.

[0062] Understandably, when the screen 100 includes a support layer 50, the thickness of the support layer 50 is the same as the thickness of the reflective layer 40 to maintain the flatness of the screen 100 when unfolded. That is, the thickness of the support layer 50 can be set to be greater than or equal to 0.2 mm and less than or equal to 0.3 mm. Similarly, when the support layer 50 has a multi-layer structure or when the support layer 50 includes both a reflective coating and a light-blocking coating, the total thickness of the multi-layer structure or the total thickness of the reflective coating and the light-blocking coating can be set to be greater than or equal to 0.2 mm and less than or equal to 0.3 mm.

[0063] In summary, the screen 100 provided in this embodiment can be in a rolled-up state and a laid-out state, thereby providing a larger projection area 1002 when the screen 100 is in use and saving storage space when stored. The screen 100 has two relatively spaced first sides 10 and two relatively spaced second sides 20. The two ends of each second side 20 are respectively connected to the two first sides 10, that is, forming a symmetrical structure to a certain extent maintaining the stability and flatness of the screen 100 when unfolded. The screen 100 also has a roller axis, which helps to improve the stability of the screen 100 when rolled up and can avoid wrinkles and other problems caused by improper winding, thereby ensuring the flatness of the screen 100 when unfolded. Furthermore, the outline of the first side 10 is an arc 11. When the screen is stretched by an external force along the direction of the first side 10, the first side 10 with the arc 11 shape generates tension away from the concave direction of the arc 11 (that is, away from the central region 1001 of the screen 100), thereby reducing the curling phenomenon. In addition, the arc 11 makes the tension distribution of the first side 10 more uniform, improves the flatness of the screen 100, thereby improving the projection effect and the user experience.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A screen, characterized in that, The curtain has two relatively spaced first sides and two relatively spaced second sides, with each end of the second side connected to the two first sides respectively; the curtain can be rolled up to be in a rolled-up state or can be unfolded to be in a flat state. In the retracted state, the curtain has a roller axis; In the flat state, the two first sides are arranged side by side in the direction of extension of the axis of the roll, the outline of the first side is an arc, the two ends of the arc are respectively connected to the two second sides, and the arc is concave towards the center area of ​​the curtain.

2. The screen as described in claim 1, characterized in that, The arc is a circular arc.

3. The screen as described in claim 2, characterized in that, The arch height of the arc is greater than or equal to 1 mm and less than or equal to 5 mm.

4. The screen as described in claim 1, characterized in that, The screen includes a substrate layer and a reflective layer. The substrate layer has a first surface and a second surface that are opposite to each other, and the reflective layer covers the first surface.

5. The screen as described in claim 4, characterized in that, The curtain also includes a support layer covering the second surface, the reflective layer includes a reflective coating, and the support layer includes a reflective coating and / or a light-blocking coating.

6. The screen as described in claim 5, characterized in that, The thickness of the reflective layer is the same as the thickness of the support layer.

7. The screen as described in claim 4, characterized in that, The thickness of the substrate layer is greater than or equal to 0.15 mm and less than or equal to 0.25 mm, and the thickness of the reflective layer is greater than or equal to 0.2 mm and less than or equal to 0.3 mm.

8. The screen as described in claim 4, characterized in that, The substrate layer includes multiple warp braided threads and multiple weft braided threads, which are woven together to form the substrate layer.

9. The screen as described in claim 8, characterized in that, Each of the warp braids contains a first number of polyester threads, and each of the weft braids contains a second number of polyester threads. The ratio of the first number to the second number is greater than or equal to 1 and less than or equal to 6. The weft braids extend in the same direction as the axis of the spool.

10. The screen as described in claim 9, characterized in that, The first quantity can be in the range of [2, 6]; The range of values ​​for the second quantity is [1, 2]; Each of the warp braided yarns is wound into a strand by the first number of polyester yarns; when the second number is equal to 2, each of the weft braided yarns is wound into a strand by the 2 polyester yarns.

11. The screen as described in claim 8, characterized in that, The multiple warp braided threads are arranged side by side with a first spacing, and the multiple weft braided threads are arranged side by side with a second spacing, wherein the first spacing is smaller than the second spacing.

12. A projection screen device, characterized in that, include: The curtain as described in any one of claims 1 to 11; as well as A winding mechanism is connected to the curtain for winding up the curtain.

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