A projection screen

Abstract

This invention relates to the field of projection screen technology and discloses a projection screen, including a screen housing, a first take-up roller, and a first screen. The screen housing contains a second take-up roller and a second screen. A first counterweight and a second counterweight are respectively installed at the bottom of the first and second screens. The second take-up roller is located diagonally above the first take-up roller. Both the first and second take-up rollers rotate inwards. Due to the overlapping installation positions of the first and second take-up rollers and their rotation towards the center, when the first and second screens are deployed, their deployment positions are very close, and their edges overlap. When the first and second screens are deployed, they combine to form a complete large screen. However, when the first motor or the second motor operates independently, only one of the first or second screens will be deployed, allowing selection of the desired screen to be deployed according to the projection type.

Description

Technical Field

[0001] This invention relates to the field of screen technology, specifically to a projection screen. Background Technology

[0002] Projection screens are among the most commonly used peripherals for projectors. Used in conjunction with projectors in settings such as cinemas, offices, home theaters, and large conferences, they are tools for displaying images and video files. They come in many different sizes. The choice of projection screen varies depending on the space. For example, for larger audiences or horizontal viewing, a wide-viewing-angle, low-gain screen is suitable. For narrow, elongated spaces, a narrow-viewing-angle, high-gain screen is preferable. Choosing a screen with appropriate gain helps improve contrast, increasing image grayscale and color vibrancy, thus enhancing image viewing quality.

[0003] Existing projection screens are generally single-piece screens with aspect ratios of 4:3, 16:9, and 2.35:1. 4:3 screens are commonly used in commercial environments, but with commercial projectors now boasting resolutions of 1920×1080, 4:3 screens are gradually being replaced by 16:9 screens in commercial settings. Home users typically choose 16:9 or 2.35:1 projection screens, with the vast majority opting for 16:9. 2.35:1 screens are generally used by villa-style users with dedicated home theaters and require a dedicated anamorphic lens for use with the projector. Existing screens, regardless of aspect ratio, mostly only come with one fixed aspect ratio. However, nowadays, not only projectors but also mobile phones can project vertically, making it difficult for existing screens to support both aspect ratios simultaneously. Therefore, to address these needs, we propose a new type of projection screen. Summary of the Invention

[0004] This invention provides a projection screen with the beneficial effect of solving the problem mentioned in the background art above, where existing screens, regardless of their aspect ratio, are mostly equipped with only one fixed aspect ratio. Now, not only projectors can project, but mobile phones can also project vertically, making it difficult for existing screens to support both aspect ratios simultaneously.

[0005] The present invention provides the following technical solution: a projection screen, comprising a screen housing, a first take-up roller, and a first screen. The screen housing has a fabric outlet at its bottom. The first take-up roller is rotatably installed inside the screen housing. The first screen is wound around the first take-up roller. A second take-up roller and a second screen are disposed inside the screen housing. A first counterweight and a second counterweight are respectively installed at the bottom of the first screen and the second screen. The second take-up roller is rotatably installed inside the screen housing. The second screen is wound around the outside of the second take-up roller. The second take-up roller is disposed diagonally above the first take-up roller. Both the first take-up roller and the second take-up roller rotate inward.

[0006] As an alternative projection screen solution according to the present invention, the first screen and the second screen are provided with an overlapping area, the first screen and the second screen are attached to each other in the overlapping area, the first take-up roller and the second take-up roller are parallel to each other, the second take-up roller is located to the right of the first take-up roller, the ends of the first take-up roller and the second take-up roller overlap, and the overlapping area is located below the overlapping area of ​​the first take-up roller and the second take-up roller.

[0007] As an optional projection screen solution of the present invention, the inner wall of the screen housing is provided with a plurality of limiting guide rails, all of which are horizontally and vertically arranged. A first slider is installed on both sides of the first take-up roller, and a second slider is installed on both sides of the second take-up roller. The first slider and the second slider are respectively slidably engaged with the corresponding limiting guide rails.

[0008] As an optional projection screen solution of the present invention, wherein: a card plate is vertically installed on both sides of the end of the first slider, the card plate is slidably connected to the limiting guide rail, an installation hole is opened in the middle of the first slider, both ends of the first take-up roller pass through the installation hole, and the structure of the second slider is the same as that of the first slider.

[0009] As an optional projection screen solution of the present invention, wherein: a first motor is installed on the side of the first slider, the output end of the first motor is connected to the first take-up roller key, and a second motor is installed on the side of the second slider, the output end of the second motor is connected to the second take-up roller key.

[0010] As an optional projection screen solution of the present invention, wherein: a first rack and a second rack are respectively installed on the inner wall of the screen housing; a first gear is installed on both sides of the first take-up roller, the first gear meshing with the first rack; and a second gear is installed on both sides of the second take-up roller, the second gear meshing with the second rack.

[0011] As an optional projection screen solution of the present invention, a hanging bracket is installed on the rear side of the screen housing. There are two hanging brackets, which are arranged symmetrically. The hanging brackets are H-shaped mounting brackets, and several mounting holes are opened on the side of the hanging brackets.

[0012] As an optional projection screen solution of the present invention, the first screen is set to 2.35:1, the second screen is set to 9:16, the right edge of the first screen and the left edge of the second screen are attached to each other, magnetic strips are sewn on the edges of the first screen and the second screen, the magnetic strips are set inside the overlapping area, after the first screen and the second screen are put down, the corresponding magnetic strips attract each other and stick together, and the edges of the two magnetic strips are respectively aligned with the edges of the first counterweight and the second counterweight.

[0013] As an optional projection screen solution of the present invention, the screen housing has two grooves on its side, the two grooves are respectively located on both sides of the fabric outlet, and two auxiliary rollers are rotatably mounted on the side of the screen housing, the two auxiliary rollers are respectively located in the two grooves, the two auxiliary rollers are fitted with each other with a gap, and the first screen and the second screen are respectively attached to the two auxiliary rollers.

[0014] As an optional projection screen solution according to the present invention, the bottom inner wall of the screen housing is provided with a curved section, the curved section is located above the auxiliary roller, the two curved sections are symmetrically arranged, the two curved sections are connected to the fabric outlet in a line, the first screen and the second screen are slidably attached to the curved section, a distribution strip is installed inside the screen housing, the distribution strip is located directly above the fabric outlet, the cross section of the distribution strip is set as a teardrop shape, and the first screen and the second screen are slidably attached to the side of the distribution strip.

[0015] The present invention has the following beneficial effects:

[0016] 1. This projection screen has two screens of different sizes installed inside the screen housing. When the first and second motors run simultaneously, the first and second screens can be deployed at the same time. Due to the overlap of the horizontal mounting positions of the first and second take-up rollers, and the fact that both rollers rotate towards the center, the first and second screens are deployed very close together with a small height difference, and their edges overlap. Therefore, when the first and second screens are deployed, from the viewer's perspective, they appear as a single, large screen, without affecting the use of the projection screen. However, when either the first or second motor runs independently, only one screen will be deployed. Since the two screens are of different sizes, the appropriate screen can be deployed according to the projection type, meeting more needs and offering greater flexibility and user-friendliness.

[0017] 2. When the first or second screen is deployed, the first and second take-up rollers will lose some thickness of the screen. Through the cooperation of the first and second gears with the first and second racks, when the first or second take-up roller rotates, the first and second gears will rotate accordingly. Due to the meshing of the first and second gears with the first and second racks, and the sliding engagement of the first and second sliders with the limiting guide rail, the first and second take-up rollers will move stably up and down. Therefore, when the first and second screens are deployed, the first and second take-up rollers will be closer together, and the height of the take-up roller movement corresponds to the thickness loss of the screen. Therefore, when the screen is deployed, the position of the take-up rollers after deploying the screen should not change as much as possible, thereby ensuring the accuracy of the fit between the first and second screens and reducing the adverse effects of splicing the two screens on the viewing experience.

[0018] 3. This projection screen, through the setting of the curved section and auxiliary rollers, will bring the first and second screens together when they are released. Furthermore, through the setting of the magnetic strip, when the first and second screens are close together, they will be attracted and adhered by magnetic force, thus making the screens fit more closely and further improving the accuracy of screen splicing. At the same time, through the setting of the distribution strip, when the first and second screens are rolled up at the same time, the originally overlapping area will be directly separated by the distribution strip, thereby reducing the resistance of the first and second roll-up rollers during rotation, improving the smoothness and reliability of the projection screen during use. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0020] Figure 2 This is a schematic diagram of the main structure of the present invention.

[0021] Figure 3This is a side view cross-sectional structural diagram of the present invention.

[0022] Figure 4 This is a schematic diagram of the internal three-dimensional side view structure of the present invention.

[0023] Figure 5 This is a schematic diagram of the internal three-dimensional main view structure of the present invention.

[0024] Figure 6 This is a top view of the internal structure of the present invention.

[0025] Figure 7 This is a top view of the internal structure of the present invention.

[0026] Figure 8 This is a schematic diagram of the limiting guide rail structure of the present invention.

[0027] In the diagram: 100, curtain housing; 110, suspension bracket; 111, binding hole; 120, first take-up roller; 130, second take-up roller; 140, first gear; 150, second gear; 160, first rack; 170, second rack; 180, first slider; 181, mounting hole; 182, clamping plate; 190, second slider; 200, first curtain; 210, first motor; 220, first magnetic strip; 230, first counterweight; 240, second counterweight; 250, overlapping area; 300, second curtain; 310, second motor; 320, second magnetic strip; 400, fabric outlet; 410, auxiliary roller; 420, distribution strip; 430, limiting guide rail; 440, groove; 450, curved section. Detailed Implementation

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Example 1

[0030] This embodiment aims to address the issue that existing screens, regardless of aspect ratio, mostly only come with one fixed aspect ratio. Now, not only projectors but also mobile phones can project in portrait mode, making it difficult for existing screens to support simultaneous projection in both aspect ratios. Please refer to [link to relevant documentation]. Figures 1-6 A projection screen includes a screen housing 100, a first take-up roller 120, and a first screen 200, see [link to documentation]. Figure 1The screen housing 110 is a PVC rectangular housing. The bottom of the screen housing 100 has a fabric outlet 400 for extending the screen. A hanging bracket 110 is bolted to the rear of the screen housing 100. (See...) Figure 5 There are two hanging brackets 110, which are arranged symmetrically. The hanging brackets 110 are H-shaped mounting brackets. Several mounting holes 111 are provided on the side of the hanging brackets 110, so that the screen box 100 can be wall-mounted or installed on the bracket.

[0031] See Figure 4 The first take-up roller 120 is rotatably installed inside the curtain machine box 100. The first curtain 200 is wound around the first take-up roller 120. The curtain machine box 100 is also provided with a second take-up roller 130 and a second curtain 300. The bottom of the first curtain 200 and the second curtain 300 are respectively equipped with a first counterweight 230 and a second counterweight 240 to keep the curtain flat and vertical after it is lowered.

[0032] The second take-up roller 130 is rotatably mounted inside the curtain machine box 100. The second curtain 300 is wound around the outside of the second take-up roller 130. Figure 3 The second take-up roller 130 is positioned obliquely above the first take-up roller 120. Both the first take-up roller 120 and the second take-up roller 130 rotate inward. As shown in the diagram, dividing the cross-section into four quadrants, if the first take-up roller 120 is positioned in the third quadrant, then the second take-up roller 120 is in the first quadrant. Because both the first take-up roller 120 and the second take-up roller 130 rotate inward, the first curtain 200 and the second curtain 300 are positioned as close as possible when released from the take-up rollers, allowing the two curtains to fit together as quickly as possible after release, thus improving the efficiency of curtain splicing.

[0033] In specific configuration, the first curtain 200 and the second curtain 300 share an overlapping area 250, in which the first curtain 200 and the second curtain 300 are closely fitted together. The first take-up roller 120 and the second take-up roller 130 are parallel to each other, and the second take-up roller 130 is located to the right of the first take-up roller 120. Figure 6 The ends of the first take-up roller 120 and the second take-up roller 130 overlap, and the overlap area 250 is located below the overlap area of ​​the first take-up roller 120 and the second take-up roller 130.

[0034] In this embodiment, the first curtain 200 is set to 2.35:1, the second curtain 300 is set to 9:16, and the length of the second curtain 300 is the same as the width of the first curtain 200. The right edge of the first curtain 200 is attached to the left edge of the first curtain 200.

[0035] In this embodiment, two screens of different specifications are installed simultaneously inside the screen housing 100. The first screen 200 and the second screen 300 can be deployed at the same time. Due to the overlap of the horizontal installation positions of the first take-up roller 120 and the second take-up roller 130, and the fact that both the first take-up roller 120 and the second take-up roller 130 rotate towards the center, the deployment positions of the first screen 200 and the second screen 300 are very close, with a small height difference, and their edges overlap by a region 250. Therefore, when the first screen 200 and the second screen 300 are deployed, from the viewer's perspective, the first screen 200 and the second screen 300 appear together as a complete large screen, without affecting the use of the projection screen. When other projection scales are required, only one of the first screen 200 or the second screen 300 will be deployed. Since the two screens have different sizes, the screen to be deployed can be selected according to the needs of the projection type, meeting more needs and making the use more flexible and user-friendly.

[0036] Example 2

[0037] This embodiment aims to address the issue where the curtain is normally wound up on the take-up roller, resulting in a curtain roll of a certain thickness outside the take-up roller. When the take-up roller continuously rotates to release the curtain, the thickness of the curtain roll decreases sharply, affecting the spacing between the fabric exit positions on the first and second take-up rollers. This embodiment is an improvement upon Embodiment 1. For details, please refer to [link to Embodiment 1]. Figure 3 , Figure 4 and Figure 8 The inner wall of the curtain machine box 100 is provided with four limiting guide rails 430. The four limiting guide rails 430 are arranged in pairs and are all horizontal and vertical. The first slider 180 is installed on both sides of the first take-up roller 120, and the second slider 190 is installed on both sides of the second take-up roller 130. The first slider 180 and the second slider 190 are respectively slidably engaged with the corresponding limiting guide rails 430.

[0038] A first motor 210 is mounted on the side of the first slider 180, and the output end of the first motor 210 is keyed to the first take-up roller 120. A second motor 310 is mounted on the side of the second slider 190, and the output end of the second motor 310 is keyed to the second take-up roller 130. A first rack 160 and a second rack 170 are respectively mounted on the inner wall of the curtain housing 100. A first gear 140 is mounted on both sides of the first take-up roller 120, and the first gear 140 meshes with the first rack 160. A second gear 150 is mounted on both sides of the second take-up roller 130, and the second gear 150 meshes with the second rack 170. When the first motor 210 is running, it drives the first take-up roller 120 to rotate, which in turn drives the first gear 140 to rotate. The first gear 140 meshes with the first rack 160, thereby moving the first take-up roller 120 along the limiting guide rail 430.

[0039] It should be noted that the distance that the first take-up roller 120 or the second take-up roller 130 can move is the same as the thickness of the first curtain 200 or the second curtain 300 when it is rolled up and unrolled.

[0040] See Figure 8 A retaining plate 182 is vertically mounted on both sides of the end of the first slider 180. The retaining plate 182 is slidably connected to the limiting guide rail 430. A mounting hole 181 is provided in the middle of the first slider 180, and both ends of the first take-up roller 120 pass through the mounting hole 181. The structure of the second slider 190 is the same as that of the first slider 180. With the arrangement of the first slider 180 and the second slider 190, the first take-up roller 120 and the second take-up roller 130 are more stable when moving.

[0041] In this embodiment: when the first curtain 200 or the second curtain 300 is released, the first take-up roller 120 and the second take-up roller 130 will lose the thickness of the curtain. Through the cooperation of the first gear 140, the second gear 150 with the first rack 160, the second rack 170, when the first take-up roller 120 or the second take-up roller 130 rotates, the first gear 140 or the second gear 150 rotates accordingly. Due to the meshing of the first gear 140, the second gear 150 with the first rack 160, the second rack 170, and the first slider 180, the second slider 190 and the limiting guide... With the sliding engagement of track 430, the first take-up roller 120 and the second take-up roller 130 will move up and down stably, minimizing the impact on the screen output. Therefore, when the first screen 200 and the second screen 300 are released, the first take-up roller 120 and the second take-up roller 130 will be closer together. The height of the take-up roller movement corresponds to the thickness loss of the screen. Therefore, when the screen is released, the position of the take-up roller releasing the screen will not change as much as possible, thereby ensuring the accuracy of the fit between the first screen 200 and the second screen 300 and reducing the adverse effects of splicing the two screens on the viewing experience.

[0042] Example 3

[0043] This embodiment aims to address the problem that relying solely on the weight of counterweights to maintain verticality between two screens makes them susceptible to external interference after being lowered, resulting in misalignment, incomplete splicing, and ultimately affecting the screen's usability. This embodiment is an improvement upon Embodiment 2. For details, please refer to [link / reference]. Figures 1-8The edges of the first curtain 200 and the second curtain 300 are respectively sewn with a first magnetic strip 220 and a second magnetic strip 320. Specifically, the first magnetic strip 230 and the second magnetic strip 320 are set as soft magnetic stickers and are positioned within the overlapping area. After the first curtain 200 and the second curtain 300 are lowered, the first magnetic strip 230 and the second magnetic strip 320 attract and adhere to each other, with their edges aligned with the edges of the first counterweight 230 and the second counterweight 240, respectively. It should be noted that the first magnetic strip 220 and the second magnetic strip 320 are spaced a distance from the first counterweight 230 and the second counterweight 240, so that when one curtain is fully rolled up, it will not affect the raising or lowering of the other curtains.

[0044] The curtain machine box 100 has two grooves 440 on its side, which are respectively located on both sides of the fabric outlet 400. Two auxiliary rollers 410 are rotatably mounted on the side of the curtain machine box 100. The two auxiliary rollers 410 are respectively located in the two grooves 440 and are fitted with each other with a gap. The first curtain 200 and the second curtain 300 are respectively in contact with the two auxiliary rollers 410 to help the first curtain 200 and the second curtain 300 to be smoothly discharged.

[0045] See Figure 3 The bottom inner wall of the curtain machine box 100 is provided with a curved part 450. The curved part 450 is located above the auxiliary roller 410. The two curved parts 450 are symmetrically arranged and are connected to the cloth outlet 400 in a straight line. The first curtain 200 and the second curtain 300 slide and adhere to the curved part 450 and are gathered and adhered by the curved part 450.

[0046] The screen housing 100 has a distribution strip 420 installed inside. The distribution strip 420 is located directly above the screen outlet 400. The cross section of the distribution strip 420 is designed to be a smooth teardrop shape. The first screen 200 and the second screen 300 slide and adhere to the side of the distribution strip 420.

[0047] In this embodiment: when the first screen 200 and the second screen 300 are extended, the two screens are brought together. With the magnetic strip, when the first screen 200 and the second screen 300 are close together, they will be attracted and adhered due to magnetic force, making the screens adhere more closely and further improving the accuracy of screen splicing. At the same time, with the distribution strip 420, when the first screen 200 and the second screen 300 are rolled up at the same time, the originally adhered overlapping area 250 will be directly separated by the distribution strip 420, thereby reducing the resistance of the first winding roller 120 and the second winding roller 130 during rotation, and improving the smoothness and reliability of the projection screen during use.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A projection screen, comprising a screen housing (100), a first take-up roller (120), and a first screen (200), wherein the screen housing (100) has a fabric outlet (400) at its bottom, the first take-up roller (120) is rotatably mounted inside the screen housing (100), and the first screen (200) is wound around the first take-up roller (120), characterized in that: The curtain housing (100) is internally provided with a second take-up roller (130) and a second curtain (300). A first counterweight (230) and a second counterweight (240) are respectively installed at the bottom of the first curtain (200) and the second curtain (300). The second take-up roller (130) is rotatably installed inside the curtain housing (100). The second curtain (300) is wound around the outside of the second take-up roller (130). The second take-up roller (130) is located diagonally above the first take-up roller (120). Both the first take-up roller (120) and the second take-up roller (130) rotate inwards. The inner wall of the curtain housing (100) is provided with several limiting guide rails (430). 0) Both are set horizontally and vertically. The first take-up roller (120) is equipped with a first slider (180) on both sides, and the second take-up roller (130) is equipped with a second slider (190) on both sides. The first slider (180) and the second slider (190) are respectively slidably engaged with the corresponding limiting guide rail (430). The ends of the first slider (180) are vertically equipped with a clamping plate (182), and the clamping plate (182) is slidably connected with the limiting guide rail (430). The first slider (180) has a mounting hole (181) in the middle, and the two ends of the first take-up roller (120) pass through the mounting hole (181). The structure of the second slider (190) is the same as that of the first slider (180).

2. A projection screen according to claim 1, characterized in that: The first curtain (200) and the second curtain (300) are provided with an overlapping area (250). The first curtain (200) and the second curtain (300) in the overlapping area (250) are attached to each other. The first take-up roller (120) and the second take-up roller (130) are parallel to each other. The second take-up roller (130) is located to the right of the first take-up roller (120). The ends of the first take-up roller (120) and the second take-up roller (130) overlap. The overlapping area (250) is located below the overlapping area of ​​the first take-up roller (120) and the second take-up roller (130).

3. A projection screen according to claim 1, characterized in that: A first motor (210) is mounted on the side of the first slider (180), and the output end of the first motor (210) is keyed to the first take-up roller (120). A second motor (310) is mounted on the side of the second slider (190), and the output end of the second motor (310) is keyed to the second take-up roller (130).

4. A projection screen according to claim 1, characterized in that: The inner wall of the curtain machine box (100) is respectively equipped with a first rack (160) and a second rack (170). A first gear (140) is installed on both sides of the first take-up roller (120), and the first gear (140) meshes with the first rack (160). A second gear (150) is installed on both sides of the second take-up roller (130), and the second gear (150) meshes with the second rack (170).

5. A projection screen according to claim 1, characterized in that: The curtain box (100) is equipped with a hanging bracket (110) on the rear side. There are two hanging brackets (110), which are arranged symmetrically. The hanging brackets (110) are H-shaped mounting brackets, and several binding holes (111) are opened on the side of the hanging brackets (110).

6. A projection screen according to claim 2, characterized in that: The first curtain (200) is set to 2.35:1, and the second curtain (300) is set to 9:

16. The right edge of the first curtain (200) is attached to the left edge of the first curtain (200). The edges of the first curtain (200) and the second curtain (300) are sewn with a first magnetic strip (220) and a second magnetic strip (320). The first magnetic strip (220) and the second magnetic strip (320) are located inside the overlapping area (250). After the first curtain (200) and the second curtain (300) are lowered, the first magnetic strip (220) and the second magnetic strip (320) attract and adhere to each other. The edges of the first magnetic strip (220) and the second magnetic strip (320) are aligned with the edges of the first counterweight (230) and the second counterweight (240), respectively.

7. A projection screen according to claim 1, characterized in that: The curtain housing (100) has two grooves (440) on its side, which are respectively located on both sides of the fabric outlet (400). Two auxiliary rollers (410) are rotatably mounted on the side of the curtain housing (100). The two auxiliary rollers (410) are respectively located in the two grooves (440) and are fitted with each other with a gap. The first curtain (200) and the second curtain (300) are respectively attached to the two auxiliary rollers (410).

8. A projection screen according to claim 7, characterized in that: The bottom inner wall of the curtain machine box (100) is provided with a curved part (450), the curved part (450) is located above the auxiliary roller (410), the two curved parts (450) are symmetrically arranged, the two curved parts (450) are connected to the fabric outlet (400) in a line, the first curtain (200) and the second curtain (300) slide against the curved part (450), a distribution strip (420) is installed inside the curtain machine box (100), the distribution strip (420) is located directly above the fabric outlet (400), the cross section of the distribution strip (420) is set as a teardrop shape, the first curtain (200) and the second curtain (300) slide against the side of the distribution strip (420).

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