Projection device

Abstract

A projection device belongs to the field of projection technology. The projection device includes: an optical engine (1) and a projection screen (2); the projection screen (2) includes a base (25), a curling component (21), a lifting component (22), an optical curtain (23) and a tensioning mechanism (24); the curling component (21) is arranged on the base (25), and both the optical curtain (23) and the tensioning mechanism (24) are fixedly connected to the curling component (21); the first end of the lifting component (22) is fixedly connected to the base (25), and both the optical curtain (23) and the tensioning mechanism (24) are also fixedly connected to the second end of the lifting component (22), and the lifting component (22) is located between the optical curtain (23) and the tensioning mechanism (24).

Description

[0001] Cross - Reference to Related Applications

[0002] This application claims the priority of a Chinese patent application with the application number 202010339953.6 and the invention title "Projection Device" filed on April 26, 2020, and a Chinese patent application with the application number 202110383578.X and the invention title "Projection Device" filed on April 9, 2021. The entire contents of both are incorporated herein by reference. Technical Field

[0003] Embodiments of this application relate to the field of projection technology, and particularly to a projection device. Background Art

[0004] With the continuous development of technology, projection devices are increasingly applied in people's work and life. Currently, projection devices mainly include an optical engine and a projection screen. Among them, the light-emitting port side of the optical engine faces the projection screen to emit a light beam to the projection screen, and the projection screen is used to receive the light beam and display an image. Summary of the Invention

[0005] This application provides a projection device, and the technical solution is as follows:

[0006] The projection device includes:

[0007] An optical engine for emitting a light beam;

[0008] A projection screen including a base, a curling assembly, a lifting assembly, an optical curtain, and a tensioning mechanism;

[0009] The curling assembly is disposed on the base. Both the optical curtain and the tensioning mechanism are fixedly connected to the curling assembly. The first end of the lifting assembly is fixedly connected to the base, and both the optical curtain and the tensioning mechanism are also fixedly connected to the second end of the lifting assembly, and the lifting assembly is located between the optical curtain and the tensioning mechanism;

[0010] When the optical curtain is unfolded, it reflects the light beam emitted by the optical engine to display an image, and when the tensioning mechanism is unfolded, it tensions the second end of the lifting assembly. Description of the Drawings

[0011] To more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0012] Figure 1 It is a schematic structural diagram of a partial enlargement of a projection screen provided by the related art;

[0013] Figure 2 It is a schematic side view structure diagram of a projection screen provided by the related art;

[0014] Figure 3 It is a schematic side view structure diagram of a projection device provided by an embodiment of the present application;

[0015] Figure 4 It is a schematic side view structure diagram of a projection screen provided by an embodiment of the present application;

[0016] Figure 5 It is a schematic front view structure diagram of a projection screen provided by an embodiment of the present application;

[0017] Figure 6 It is a schematic rear view structure diagram of a projection screen provided by an embodiment of the present application;

[0018] Figure 7 It is a schematic rear view structure diagram of another projection screen provided by an embodiment of the present application;

[0019] Figure 8 It is a schematic side view structure diagram of a forward-tilted projection screen provided by an embodiment of the present application;

[0020] Figure 9 It is a schematic side view structure diagram of an adjusted projection screen provided by an embodiment of the present application;

[0021] Figure 10 It is a schematic structure diagram of another projection device provided by an embodiment of the present application.

[0022] Reference numerals:

[0023] Related art:

[0024] 1: Projection screen; 11: Optical screen; 12: Coiling assembly; 13: Lifting assembly; 14: Base;

[0025] 131: First support rod; 132: Second support rod; 133: Connecting shaft.

[0026] Embodiment of the present application:

[0027] 1: Optical engine; 2: Projection screen; 3: Base;

[0028] 21: Coiling assembly; 22: Lifting assembly; 23: Optical screen; 24: Tensioning mechanism; 25: Base;

[0029] 221: First support rod; 222: Second support rod; 223: Cross beam;

[0030] 241: Auxiliary roller; 242: Tensioning assembly; 243: First screw;

[0031] 251: Side wall; 252: First guide groove;

[0032] 2411: Central axis; 2412: Drum; 2413: Second screw;

[0033] 2421: First auxiliary cloth; 2422: First tensioning rope. Detailed implementation manner

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the following will explain the situations such as skew or distortion of the optical screen in combination with related technologies.

[0035] In related technologies, as Figure 1 shown, the projection screen 1 includes an optical screen 11, a curling assembly 12, a lifting assembly 13, and a base 14. The curling assembly 12 is fixed on the base 14, and the optical screen 11 is fixedly connected to the curling assembly 12. At the same time, the optical screen 11 is also fixedly connected to one end of the lifting assembly 13 away from the curling assembly 12. The lifting assembly 13 and the curling assembly 12 can control the unfolding and curling of the optical screen 11. Among them, the lifting assembly 13 includes multiple sets of brackets. Each set of brackets includes a first support rod 131 and a second support rod 132. At the three movable joints between the first end of the first support rod 131 and the base 14, between the second end of the first support rod 131 and the first end of the second support rod 132, and between the second end of the second support rod 132 and the optical screen 11, they are all rotatably connected. The multiple sets of brackets can control the unfolding of the optical screen 11.

[0036] For the multiple sets of brackets included in the lifting assembly 13, each set of brackets further includes a connecting shaft 133; a first connecting groove is provided at the second end of the first support rod 131, and the first end of the second support rod 132 extends into the first connecting groove. The second end of the first support rod 131 and the first end of the second support rod 132 are rotatably connected through the connecting shaft 133. Among them, connecting holes are provided on the two groove walls of the first connecting groove and the side wall of the first end of the second support rod 132. The connecting shaft 133 passes through the connecting holes on the two groove walls and the connecting hole on the second support rod 132 to achieve the rotatable connection between the first support rod 131 and the second support rod 132.

[0037] Generally, there is an assembly gap between the hole wall of the connection hole on the groove wall and the connection shaft 133. Exemplarily, the gap between the hole wall of the connection hole on the groove wall and the connection shaft 133 can be less than or equal to 0.2 mm. In this way, the second support rod 132 is prone to tilt under the action of an external force, resulting in a change in the relative positional relationship between the second end of the first support rod 131 and the first end of the second support rod 132, and at the same time causing an angle between the straight line passing through the centers of the two connection holes on the first connection groove and the axial direction of the connection shaft 133. Further, after the second support rod 132 tilts, it will cause the optical screen 11 to also tilt forward or backward.

[0038] Among them, the tilt angle of the second support rod 132 is equal to the angle between the straight line passing through the centers of the two connection holes on the first connection groove and the axial direction of the connection shaft 133. The maximum angle between the straight line passing through the centers of the two connection holes on the first connection groove and the axial direction of the connection shaft 133 can be calculated according to the following formula:

[0039] α = tan -1 D / B

[0040] Among them, α is the maximum angle between the straight line passing through the centers of the two connection holes on the first connection groove and the axial direction of the connection shaft 133, D is the gap between the hole wall of the connection hole and the connection shaft 133, and B is the distance between the two groove walls of the first connection groove.

[0041] It should be noted that since the position of the curling assembly 12 is fixed, the position of the side of the optical screen 11 connected to the curling assembly 12 will not change. And for the second support rods 132 included in multiple groups of brackets, they may all tilt away from the optical screen 11, so the side of the optical screen 11 connected to the multiple groups of brackets will tilt backward, resulting in the optical screen 11 tilting backward; or as Figure 2 shown, the second support rods 132 included in multiple groups of brackets may also all tilt towards the optical screen 11, so the side of the optical screen 11 connected to the multiple groups of brackets will tilt forward, resulting in the optical screen 11 tilting forward.

[0042] Based on the above description, in the related art, the optical screen 11 included in the projection screen 1 is prone to tilt forward or backward, resulting in the optical screen 11 being unable to normally receive the light beam emitted by the optical engine, and thus causing problems such as distortion, blurring, and distortion of the displayed image.

[0043] Next, the embodiments of the present application will be further described in detail with reference to the accompanying drawings.

[0044] Figure 3 Illustrates a schematic structural diagram of a projection device according to an embodiment of the present application. As Figure 3As shown in the figure, the projection device includes: an optical engine 1 and a projection screen 2. The optical engine 1 is used to emit light beams. The projection screen 2 includes a base 25, a curling component 21, a lifting component 22, an optical curtain 23, and a tensioning mechanism 24. The curling component 21 is arranged on the base 25, and both the optical curtain 23 and the tensioning mechanism 24 are fixedly connected to the curling component 21. The first end of the lifting component 22 is fixedly connected to the base 25, and both the optical curtain 23 and the tensioning mechanism 24 are also fixedly connected to the second end of the lifting component 22, and the lifting component 22 is located between the optical curtain 23 and the tensioning mechanism 24. When the optical curtain 23 is unfolded, it reflects the light beams emitted by the optical engine 1 to display an image. When the tensioning mechanism 24 is unfolded, it tensions the second end of the lifting component 22.

[0045] In the embodiment of the present application, when the optical curtain 23 and the tensioning mechanism 24 are in the unfolded state, since the lifting component 22 is located between the optical curtain 23 and the tensioning mechanism 24, the tension of the tensioning mechanism 24 on the second end of the lifting component 22 can be balanced with the tension of the optical curtain 23 on the second end of the lifting component 22. In this way, the tensioning mechanism 24 can limit the pitching angle of the optical curtain 23 and correct the pitching angle of the optical curtain 23 at the same time, so that problems such as distortion and blurring of the image displayed on the optical curtain 23 can be avoided, thereby improving the display effect of the projection screen 2.

[0046] Among them, the curling component 21 and the lifting component 22 cooperate to control the optical curtain 23 and the tensioning mechanism 24 to curl on the curling component 21 when the projection device is not in use, thereby reducing the space occupied by the projection screen 2; when the projection device is in use, it controls the optical curtain 23 and the tensioning mechanism 24 to be unfolded synchronously, so as to facilitate the optical curtain 23 to reflect the light beams emitted by the optical engine 1 and display an image.

[0047] In some embodiments, the base 25 is fixedly connected to the installation surface to fix the projection screen 2. The installation surface can be the supporting surface of a fixed bracket or the wall surface of a wall, etc., as long as it can realize the fixed support of the projection screen 2. The pitching angle of the optical curtain 23 can be the angle between the plane where the optical curtain 23 is located and the vertical line.

[0048] In some embodiments, the optical engine 1 is an ultra-short focal length optical engine. Of course, the optical engine 1 can also be a short focal length optical engine or a long focal length optical engine.

[0049] The optical engine 1 includes a light source, an optical engine system, and a lens. Among them, the optical engine system includes a DMD (Digital Micromirror Device) chip, a control circuit board, an audio processing system, a speaker, a heat dissipation system, and a radiator. The light source and the lens are both fixedly connected to the optical engine system. The DMD chip is disposed within the optical engine system. The DMD chip, the audio processing system, and the heat dissipation system are respectively electrically connected to the control circuit board. The audio processing system is also electrically connected to the speaker, and the heat dissipation system is also electrically connected to the radiator.

[0050] In this way, the light source emits a light beam onto the DMD chip within the optical engine system. The control circuit board controls the DMD chip to modulate the light beam emitted onto the DMD chip, and emits the modulated light beam to the lens, and then emits the light beam through the lens to the optical film 23 to achieve the display of the picture. In addition, the control circuit board controls the audio processing system to process the audio information output by the control circuit board, and externally plays the processed audio information through the speaker. When displaying the image information and externally playing the audio information, the control circuit board can control the heat dissipation system to drive the radiator to dissipate heat to avoid the high temperature from affecting the functions of each device.

[0051] In the embodiment of the present application, as Figure 3 shown, in addition to including the first support rod 221 and the second support rod 222, the lifting assembly 22 further includes a cross beam 223. Among them, the cross beam 223 can be a thin plate-shaped cross beam 223. In this way, the second end of the second support rod 222 is rotatably connected to the cross beam 223, and the optical curtain 23 is fixedly connected to the first side edge along the length direction of the cross beam 223. The tensioning mechanism 24 is connected to the second side edge along the length direction of the cross beam 223, and the optical curtain 23 and the tensioning mechanism 24 are respectively located on both sides of the second support rod 222. In this way, the tensioning mechanism 24 balances the tension force of the optical curtain 23 on the cross beam 223 by tensioning the cross beam 223, thereby limiting the pitching angle of the optical curtain 23.

[0052] Among them, the second end of the second support rod 222 is also rotatably connected to the cross beam 223, that is, there is also an assembly gap when the second end of the second support rod 222 is connected to the cross beam 223. In this way, relative inclination may also occur between the cross beam 223 and the second support rod 222, resulting in the forward tilt or backward tilt of the optical curtain 23.

[0053] In the embodiment of the present application, the curling assembly 21 is an integral structure. At this time, as Figure 3 shown, the curling assembly 21 is located on the side of the lifting assembly 22 close to the optical curtain 23. In this way, the curling assembly 21 can simultaneously tension the optical curtain 23 and the tensioning mechanism 24 to limit the pitching angle of the optical curtain 23 through the tensioning mechanism 23.

[0054] Of course, in some other embodiments, the curling assembly 21 includes a first sub-curling assembly and a second sub-curling assembly; both the first sub-curling assembly and the second sub-curling assembly are connected to the base, the first sub-curling assembly and the optical curtain 23 are located on the first side of the lifting assembly 22, and the second sub-curling assembly and the tensioning mechanism 24 are located on the second side of the lifting assembly 22; the optical curtain 23 is fixedly connected to the first sub-curling assembly, and the tensioning mechanism 24 is fixedly connected to the second sub-curling assembly.

[0055] Wherein, the first sub-curling assembly can cooperate with the lifting assembly 22 to control the curling of the optical curtain 23 on the first sub-curling assembly; the second sub-curling assembly can cooperate with the lifting assembly 22 to control the curling of the tensioning mechanism 24 on the second sub-curling assembly.

[0056] In this way, since the second sub-curling assembly can control the curling of the tensioning mechanism 24 on the second sub-curling assembly, after the optical curtain 23 tilts forward, the second sub-curling assembly can be adjusted slightly forward to further curl the tensioning mechanism 24, so as to increase the tension of the tensioning mechanism 24 on the second end of the lifting assembly 22 to adjust the pitching angle of the optical curtain 23. After the optical curtain 23 tilts backward, the second sub-curling assembly is adjusted slightly backward to slightly unfold the tensioning mechanism 24, so as to reduce the tension of the tensioning mechanism 24 on the second end of the lifting assembly 22 to adjust the pitching angle of the optical curtain 23. Similarly, after the optical curtain 23 tilts forward or backward, the pitching angle of the optical curtain 23 is adjusted by slightly adjusting the first sub-curling assembly, or the pitching angle of the optical curtain 23 is adjusted by slightly adjusting the first sub-curling assembly and the second sub-curling assembly simultaneously.

[0057] Wherein, the first sub-curling assembly independently controls the optical curtain 23, and the second sub-curling assembly independently controls the tensioning mechanism 24, which is convenient for separately adjusting the tension of the optical curtain 23 on the second end of the lifting assembly 22 and the tension of the tensioning mechanism 24 on the second end of the lifting assembly 22.

[0058] Next, a detailed explanation of the tensioning mechanism included in the projection screen will be given.

[0059] In some embodiments, as Figure 3 shown, the tensioning mechanism 24 includes an auxiliary roller 241 and a tensioning component 242; the first end of the tensioning component 242 is fixedly connected to the second end of the lifting assembly 22, the second end of the tensioning component 242 is fixedly connected to the curling assembly 21, and both ends of the auxiliary roller 241 are connected to the side wall 251 of the base 25, and the auxiliary roller 241 presses on the tensioning component 242.

[0060] In this way, with the cooperation of the curling component 21 and the lifting component 22, the curling or unfolding of the tensioning component 242 can be achieved. Furthermore, when the optical curtain 23 is respectively connected to the curling component 21 and the lifting component 22, the synchronous curling and unfolding of the optical curtain 23 and the tensioning component 242 can be realized. Additionally, since the auxiliary roller 241 is pressed against the tensioning component 242, the tensioning force of the tensioning component 242 on the second end of the lifting component 22 can be controlled.

[0061] In a specific implementation, the auxiliary roller 241 has a strip-shaped structure, and the length direction of the auxiliary roller 241 is parallel to the axial direction of the curling component 21. In this way, the strip-shaped auxiliary roller 241 is convenient to be pressed against the tensioning component 242 along the length direction to perform a large-range limit on the tensioning component 242. Further, since the length direction of the auxiliary roller 241 is parallel to the axial direction of the curling component 21, the auxiliary roller 241 can ensure the flatness of the tensioning component 242, avoid the phenomenon that the tensioning component 242 is distorted due to the presence of the auxiliary roller 241, and thus avoid the distortion of the lifting component 22.

[0062] Among them, the cross-sectional shape of the auxiliary roller 241 is circular or polygonal, and the embodiments of the present application do not make any limitations in this regard. The auxiliary roller 241 with a circular cross-sectional shape is convenient for processing, and the surface of the auxiliary roller 241 is relatively smooth and not easy to damage the optical curtain 23.

[0063] In a specific implementation, the auxiliary roller 241 has a lubricating coating. In this way, the lubricating coating can play a role in lubricating between the auxiliary roller 241 and the tensioning component 242. Thus, the relative movement between the auxiliary roller 241 and the tensioning component 242 can be smoother, and at the same time, it can be avoided that the surface of the auxiliary roller 241 scratches the tensioning component 242 due to reasons such as non-smoothness, thereby extending the service life of the tensioning component 242. Among them, the lubricating coating can be a coating composed of flexible particles or a colloidal coating, and the embodiments of the present application do not make any limitations in this regard.

[0064] In a specific implementation, the tensioning assembly 242 is the first auxiliary cloth 2421 or multiple first tensioning ropes 2422. When the lifting assembly 22 includes a thin plate-shaped cross beam 223, when the tensioning assembly 242 is the first auxiliary cloth 2421, one side edge of the first auxiliary cloth 2421 is fixedly connected to the second side edge of the cross beam 223 along the length direction, and the other side edge of the first auxiliary cloth 2421 opposite to one side edge is fixedly connected to the curling assembly 21. In this way, the first auxiliary cloth 2421 tensions the lifting assembly 22 based on the cross beam 223. When the tensioning assembly 242 is multiple first tensioning ropes 2422, each pair of the first tensioning ropes 2422 can be parallel to each other, and one end of each first tensioning rope 2422 can be fixedly connected to the second side edge of the cross beam 223 along the length direction, and the other end of each first tensioning rope 2422 can be fixedly connected to the curling assembly 21. In this way, the multiple first tensioning ropes 2422 tension the lifting assembly 22 based on the cross beam 223.

[0065] Among them, as Figure 4 shown, the first auxiliary cloth 2421 is fixedly connected to the cross beam 223 through the first screw 243 or by an adhesive bonding method. Of course, it can also be fixedly connected to the cross beam 223 in other ways, and the embodiments of the present application do not limit this. In addition, as Figure 5 shown, the length of the side edge of the first auxiliary cloth 2421 fixedly connected to the cross beam 223 and the length of the side edge of the optical curtain 23 fixedly connected to the cross beam 223 can both be less than or equal to the length of the cross beam 223. In this way, under the condition that the forces on both sides of the lifting assembly 22 are more balanced, the cross beam 223 can limit the first auxiliary cloth 2421 and the optical curtain 23 more comprehensively.

[0066] Among them, when the tensioning assembly 242 is multiple first tensioning ropes 2422, multiple fixing holes corresponding to the multiple first tensioning ropes 2422 one by one are provided on the cross beam 223, and each first tensioning rope 2422 is bundled and connected to the cross beam 223 based on a corresponding fixing hole. Of course, each first tensioning rope 2422 can also be fixedly connected to the cross beam 223 in other ways, and the embodiments of the present application do not limit this. Exemplarily, as Figure 6 shown, each first tensioning rope 2422 is fixedly connected to the cross beam 223 through the first screw 243.

[0067] The spacing between each pair of the first tensioning ropes 2422 can be equal. In this way, the tensioning force of each first tensioning rope 2422 on the cross beam 223 is equal, ensuring the stability of the cross beam 223 and preventing it from skewing or the like.

[0068] It should be noted that when the curling component 21 includes a first sub-curling component and a second sub-curling component, in addition to the above-described structure, the tensioning mechanism 24 can also be a second auxiliary cloth or a plurality of second tensioning ropes.

[0069] When the tensioning mechanism 24 is a second auxiliary cloth, the connection method and connection position of the second auxiliary cloth to the cross beam 223 can be the same as or similar to those of the first auxiliary cloth 2421 to the cross beam 223. The difference is that the second auxiliary cloth is fixedly connected to the second sub-curling component. When the tensioning mechanism 24 is a plurality of second tensioning ropes, the connection method and connection position of the plurality of second tensioning ropes to the cross beam 223 can be the same as or similar to those of the plurality of first tensioning ropes 2422 to the cross beam 223. The difference is that the plurality of second tensioning ropes are fixedly connected to the second sub-curling component, which will not be elaborated in this embodiment of the present application.

[0070] In the embodiment of the present application, when the tensioning component 242 curls or unfolds, the auxiliary roller 241 can be fixed or can rotate around its own axis along the length direction. That is, both ends of the auxiliary roller 241 are connected to the side wall 251 of the base 25 in a limited position, or both ends of the auxiliary roller 241 are rotatably connected to the side wall 251 of the base 25.

[0071] When the auxiliary roller 241 can rotate, when the curling component 21 curls to retract the tensioning component 242, or the lifting component 22 controls the tensioning component 242 to unfold, the auxiliary roller 241 can rotate, thereby reducing the friction between the auxiliary roller 241 and the tensioning component 242 to prevent damage to the tensioning component 242 caused by friction between the auxiliary roller 241 and the tensioning component 242. Of course, when the curling component 21 curls to retract the tensioning component 242, in order to prevent friction, the auxiliary roller 241 can be moved away from the tensioning component 242 to avoid direct contact between the auxiliary roller 241 and the tensioning component 242. And after the tensioning component unfolds, the auxiliary roller 241 is pressed against the tensioning component 242 to limit the pitching angle of the optical curtain 23.

[0072] For the case where the auxiliary roller 241 can rotate, in some embodiments, the auxiliary roller 241 is a rod structure, and both ends of the auxiliary roller 241 are rotatably connected to the side wall 251 of the base 25 through bearings.

[0073] In other embodiments, as Figure 7 shown, the auxiliary roller 241 includes a central shaft 2411 and a drum 2412. Both ends of the central shaft 2411 are connected to the side wall 251 of the base 25 in a limited position, the drum 2412 is rotatably sleeved on the central shaft 2411, and the drum 2412 is pressed against the tensioning component 242.

[0074] In this way, since the roller 2412 can rotate around the central axis 2411, when the curling assembly 21 retracts or deploys the tensioning assembly 242, relative movement will occur between the tensioning assembly 242 and the roller 2412. Since the roller 2412 can rotate around the central axis 2411, the friction between the roller 2412 and the tensioning assembly 242 can be significantly reduced, thereby avoiding wear on the tensioning assembly 242. At the same time, the flexibility of the curling assembly 21 to retract and deploy the tensioning assembly 242 can be improved.

[0075] Among them, as Figure 7 shown, the end of the central axis 2411 can be limited to the side wall 251 of the base 25 by the second screw 2413. Of course, the end of the central axis 2411 can also be limited to the side wall 251 of the base 25 by other means, and the embodiments of the present application do not limit this. Exemplarily, the end of the central axis 2411 is limited to the side wall 251 of the base 25 by a locking nut.

[0076] In the embodiments of the present application, the end of the auxiliary roller 241 is fixedly connected to the side wall 251 of the base 25 to achieve limitation with the side wall 251 of the base 25; or the end of the auxiliary roller 241 is movably limited to the side wall 251 of the base 25.

[0077] Among them, for the movability of the auxiliary roller 241, in some embodiments, as Figure 8 or Figure 9 shown, the side wall 251 of the base 25 has a first guide groove 252. The end of the auxiliary roller 241 passes through the first guide groove 252 and can move along the length direction of the first guide groove 252. In this way, after the auxiliary roller 241 contacts the tensioning assembly 242 and continues to move along the length direction of the first guide groove 252, the tensioning assembly 242 can be pushed. Since the first end of the tensioning assembly 242 is fixedly connected to the second end of the lifting assembly 22, the second end of the tensioning assembly 242 is fixedly connected to the curling assembly 21, and both the lifting assembly 22 and the curling assembly 21 are in a stationary state, when the auxiliary roller 241 pushes the tensioning assembly 242, the pressing force on the tensioning assembly 242 can be increased, thereby tightening the tensioning assembly 242. In this way, the tension force of the tensioning assembly 242 on the second end of the lifting assembly 22 will increase to a certain extent. Similarly, when the auxiliary roller 241 moves away from the tensioning assembly 242 along the length direction of the first guide groove 252, the pressing force of the auxiliary roller 241 on the tensioning assembly 242 decreases, and the tension force of the tensioning assembly 242 on the second end of the lifting assembly 22 decreases.

[0078] Further, the auxiliary roller 241 can change the pitching angle of the optical curtain 23 based on the adjustment of the pressing force of the tensioning assembly 242. When the pitching angle of the optical curtain 23 is changed to the target pitching angle, the movement of the auxiliary roller 241 can be controlled to stop and the auxiliary roller 241 can be fixed, so as to limit the pitching angle of the optical curtain 23. By way of example, as Figure 8 shown, the optical curtain 23 tilts forward. At this time, the tension force of the optical curtain 23 on the second end of the lifting assembly 22 is greater than the tension force of the pulling-in assembly 242 on the second end of the lifting assembly 22. At this time, compared with Figure 8 and Figure 9 shown, the auxiliary roller 241 can be adjusted to move away from the optical curtain 23 along the first guiding groove 252, so as to adjust the auxiliary roller 241 to further tighten the tensioning assembly 242, realize the further tensioning of the tensioning assembly 242 on the second end of the lifting assembly 22, balance the tension force of the optical curtain 23 on the second end of the lifting assembly 22, and at the same time realize the adjustment of the inclination angle of the optical curtain 23 to ensure that the adjusted optical curtain 23 is at the target pitching angle.

[0079] Wherein, the target pitching angle of the optical curtain 23 is the included angle between the plane where the optical curtain 23 is located and the vertical line without unnecessary inclination of the optical curtain 23. By way of example, the target pitching angle of the optical curtain 23 can be 0 degrees, 5 degrees, etc. The target pitching angle of the optical curtain 23 can be set according to the angle of the light beam emitted by the optical engine 1 or other factors.

[0080] Wherein, the base 25 includes two side walls 251, and both of the two side walls 251 are provided with first guiding grooves 252. In this way, both ends of the auxiliary roller 241 respectively pass through the corresponding first guiding grooves 252, so as to facilitate the fixing of the auxiliary roller 241.

[0081] Further, a fixing nut can be respectively arranged at both ends of the auxiliary roller 241, and each fixing nut is tightened and respectively pressed on the side wall 251 close to the end of the auxiliary roller 241. Of course, two fixing nuts can also be respectively arranged at each end of the auxiliary roller 241, and the two fixing nuts at each end are respectively pressed on both sides of the side wall 251 close to the end.

[0082] It should be noted that when the auxiliary roller 241 includes a central shaft 2411 and a roller 2412, after controlling the auxiliary roller 241 to stop moving, both ends of the central shaft 2411 included in the auxiliary roller 241 can be fixed in the first guiding groove 252. In this way, the movement of the auxiliary roller 241 can be avoided, and at the same time, the relative rotation between the auxiliary roller 241 and the optical film 23 can be ensured.

[0083] Among them, the shape of the first guiding groove 252 can be strip-shaped or oval-shaped. Of course, it can also be other shapes, as long as it can enable the auxiliary roller 241 to move along the length direction of the first guiding groove 252 and be fixed on the first guiding groove 252. The embodiments of the present application do not limit this. The width of the first guiding groove 252 can be slightly larger than the diameter or side length of the cross-section of the auxiliary roller 241. In this way, the auxiliary roller 241 can move more flexibly along the length direction of the first guiding groove 252.

[0084] In some embodiments, the length direction of the first guiding groove 252 is the horizontal direction or a direction with an acute angle with the horizontal direction. Exemplarily, when the auxiliary roller 241 moves along the length direction of the first guiding groove 252, there can be a moving component in the horizontal direction. Therefore, the position where the tensioning assembly 242 contacts the auxiliary roller 241, the first end of the tensioning assembly 242, and the relative position relationship of the second end of the tensioning assembly 242 in the horizontal direction can be adjusted, so as to realize the adjustment of the pressing force of the auxiliary roller 241 on the tensioning assembly 242.

[0085] In some embodiments, lubricating members closely attached to the inner wall of the first guiding groove 252 can be arranged on the inner wall of each first guiding groove 252. In this way, the friction between the auxiliary roller 241 and the first guiding groove 252 can be reduced, the smoothness of the movement of the auxiliary roller 241 in the first guiding groove 252 can be enhanced, and at the same time, it is convenient to improve the movement accuracy of the auxiliary roller 241.

[0086] In some embodiments, the projection screen 2 further includes a control mechanism. The control mechanism is in transmission connection with the auxiliary roller 241 and is used to drive the auxiliary roller 241 to move along the length direction of the first guiding groove 252. In this way, the automatic control of the movement of the auxiliary roller 241 can be realized, and the movement amount and movement accuracy of the auxiliary roller 241 can be ensured. Further, the precise control of the pressing force of the auxiliary roller 241 on the tensioning assembly 242 can be ensured, so as to more precisely limit the pitching angle of the optical curtain 23. Of course, the movement amount of the auxiliary roller 241 can also be adjusted manually, as long as it is convenient for the adjustment of the auxiliary roller 241. The embodiments of the present application do not limit this.

[0087] Among them, the control assembly can include a motor, a rotating member, and an adjusting screw. Among them, the motor and the rotating member can be directly fixed on the base. The rotating member is in transmission connection with the output shaft of the motor. One end of the adjusting screw is fixedly connected with the rotating member along the axial direction of the rotating member, and the adjusting screw is in threaded connection with the auxiliary roller 241. Of course, the motor, the rotating member, and the adjusting screw can also be connected in other ways, as long as it can drive the auxiliary roller 241 to move along the length direction of the first guiding groove 252.

[0088] In this way, the motor receives a control instruction, and then the output shaft of the motor can rotate based on this control instruction, thereby driving the rotating member to rotate together. Since one end of the adjusting screw is fixedly connected to the rotating member along the axial direction of the rotating member, when the rotating member rotates, the adjusting screw can be driven to rotate together. In this way, when the adjusting screw rotates, the auxiliary roller 241 threadedly connected to the adjusting screw can move along the axial direction of the adjusting screw, so that the adjustment of the auxiliary roller 241 can be realized.

[0089] Among them, the motor is electrically connected to the controller to facilitate controlling the starting duration of the motor through the controller, so as to ensure that the motor realizes the precise movement of the auxiliary roller 241 through the rotating member and the adjusting screw. The motor can be a reduction motor, or of course other motors, and the embodiments of the present application do not limit this.

[0090] When the auxiliary roller 241 and the tensioning assembly 242 adjust the pitching angle of the optical curtain 23 to the target pitching angle, the controller can send a stop instruction to the motor to control the motor to stop running. Then, the rotating member and the adjusting screw can stop moving. In this way, the auxiliary roller 241 can be limited on the stationary adjusting screw, and then the auxiliary roller 241 can be kept stationary, so that the limitation of the pitching angle of the optical curtain 23 can be realized.

[0091] Among them, the rotating member can be a gear assembly, and this gear assembly can include a first gear and a second gear, and the first gear and the second gear mesh with each other. The first gear can be fixedly connected to the output shaft of the motor along the axial direction, the second gear is axially limited on the base, and can rotate synchronously with the first gear under the drive of the motor. The second gear is fixedly connected to one end of the adjusting screw along the axial direction. In this way, the adjusting screw can be driven to rotate while the second gear rotates. Of course, the rotating member can also be a belt drive assembly or other types of drive assemblies, as long as the power output by the motor can be transmitted to the adjusting screw to make the adjusting screw rotate in place, and the embodiments of the present application do not limit this.

[0092] It should be noted that the control assembly can control the auxiliary roller 241 to slide in the first guide groove 252, and limit the auxiliary roller 241 on the adjusting screw after the auxiliary roller 241 stops sliding, so that the auxiliary roller 241 stops moving.

[0093] In addition, the auxiliary roller 241 can also move in the first guide groove 252 in a rolling manner. In order to enable the auxiliary roller 241 to roll in the first guide groove 252, the auxiliary roller 241 can be manually adjusted. Of course, the auxiliary roller 241 can also be adjusted by using other control components, which is not limited in the embodiments of the present application. Further, a fixing nut can be manually set at each end of the auxiliary roller 241, and each fixing nut can be tightened so that each fixing nut is pressed against the side wall 251 near the end of the auxiliary roller 241 to fix the auxiliary roller 241. Of course, two fixing nuts can also be manually set at each end of the auxiliary roller 241, and the two fixing nuts at each end can be pressed against the two sides of the side wall 251 near the end.

[0094] In the embodiment of the present application, in addition to adjusting the pitch angle of the optical screen by the tensioning mechanism, the pitch angle of the optical screen can also be adjusted by other methods, or by a combination of several methods. For example, the projection screen includes a guide roller, and the pitch angle of the optical screen is adjusted by the guide roller; or the projection screen includes an adjustment mechanism, and the pitch angle of the optical screen is adjusted by the adjustment mechanism.

[0095] Next, a case where the projection screen includes the guide roller is explained in detail.

[0096] In some embodiments, the projection screen further comprises a guide roller; the guide roller is disposed on the base and can be pressed against the optical curtain to limit the pitch angle of the optical curtain.

[0097] In a specific implementation, the guide roller is in a long strip structure so as to be pressed against the optical curtain along the length direction and limit the optical curtain over a large range. Of course, the guide roller can also be in other shapes as long as it can press the optical curtain and limit the pitch angle of the optical curtain, and the embodiment of the present application does not limit this.

[0098] Among them, the cross-sectional shape of the guide roller is circular or polygonal, and the embodiment of the present application does not limit this. The guide roller with a circular cross-sectional shape is easy to process, and the surface of the guide roller is relatively smooth, which is not easy to cause damage to the optical curtain. The guide roller with a polygonal cross-sectional shape is more stable and less likely to shake. When the cross-sectional shape of the guide roller is a polygon, for example, the cross-sectional shape can be a square or hexagon, etc., and the embodiment of the present application does not limit this.

[0099] It should be noted that when the optical curtain is curled or unfolded, the guide roller can remain stationary or rotate around its own axis along the length direction. When the guide roller can rotate, when the control mechanism curls to retract the optical curtain or tightens to unfold the optical curtain, the guide roller can rotate, thereby reducing the friction between the guide roller and the optical curtain and preventing damage to the optical curtain caused by friction between the guide roller and the optical curtain. Of course, when the control mechanism curls to retract the optical curtain or tightens to unfold the optical curtain, in order to prevent friction, the guide roller can also be moved away from the optical curtain to avoid direct contact between the guide roller and the optical curtain.

[0100] In some embodiments, during the process of the control mechanism tightening to unfold the optical curtain, the guide roller can be controlled to move away from the optical curtain. When the optical curtain is unfolded on the control mechanism, the guide roller can be controlled to press on the optical curtain to limit the pitch angle of the optical curtain. During the process of the control mechanism curling to retract the optical curtain, the guide roller that was originally pressing on the optical curtain can be moved away to avoid direct contact and friction between the guide roller and the optical curtain. Further, when the projection screen is used next time, the guide roller can be kept in its original position. When the optical curtain is unfolded on the control mechanism again, the guide roller can continue to be controlled to press on the optical curtain.

[0101] It should also be noted that in order to enable the guide roller pressing on the optical curtain to rotate around its own axis along the length direction, the guide roller can be a drum-type guide roller. The drum-type guide roller includes a central shaft and a hollow cylindrical drum. The central shaft can remain stationary, and the hollow cylindrical drum can rotate around the central shaft. Of course, the guide roller can also be other types of guide rollers, and the embodiments of the present application do not limit this. Among them, the hollow cylindrical drum can be a hollow cylindrical drum or a hollow prismatic drum.

[0102] In some embodiments, a protective coating is provided on the guide roller. In this way, the protective coating can avoid direct contact between the guide roller and the optical curtain, so that when relative movement occurs between the optical curtain and the guide roller, the surface of the guide roller can be prevented from scratching the optical curtain due to reasons such as unevenness, thereby extending the service life of the optical curtain. Among them, the protective coating can be a coating composed of flexible particles or a colloidal coating, and the embodiments of the present application do not limit this.

[0103] In some embodiments, the side wall of the base has a second guiding groove, and the guiding roller passes through the second guiding groove and is capable of moving along the length direction of the second guiding groove. In this way, after the guiding roller contacts the optical curtain and continues to move along the length direction of the second guiding groove, the optical curtain can be pushed. Since one side edge of the optical curtain away from the guiding roller is fixed, the pitching angle of the optical curtain can be changed when the guiding roller pushes the optical curtain. Further, when the guiding roller changes the pitching angle of the optical curtain to the target pitching angle, the movement of the guiding roller can be controlled to stop and the guiding roller can be fixed so that the guiding roller presses against the optical curtain, thereby realizing the limitation of the pitching angle of the optical curtain.

[0104] Among them, both of the two side walls included in the base have second guiding grooves. In this way, both ends of the guiding roller pass through the corresponding second guiding grooves respectively, which is convenient for fixing the guiding roller.

[0105] Further, a fixing nut can be respectively arranged at both ends of the guiding roller, and after each fixing nut is tightened, it presses against the supporting plate close to the end of the guiding roller. Of course, two fixing nuts can also be respectively arranged at each end of the guiding roller, and the two fixing nuts at each end respectively press against both sides of the supporting plate close to the end.

[0106] It should be noted that when the guiding roller is the drum-type guiding roller in the above embodiments, after controlling the guiding roller to stop moving, both ends of the central shaft included in the guiding roller can be fixed in the second guiding groove. In this way, it does not affect the rotation of the hollow cylindrical drum around the central shaft.

[0107] Among them, the shape of the second guiding groove is strip-shaped or oval-shaped. Of course, it can also be other shapes, as long as it can realize the movement of the guiding roller along the length direction of the second guiding groove and be fixed on the second guiding groove. The embodiments of the present application do not limit this. The width of the second guiding groove can be slightly larger than the diameter or side length of the cross-section of the guiding roller. In this way, the guiding roller can move more flexibly along the length direction of the second guiding groove. The length of the second guiding groove can be set according to the limit inclination amount of the optical curtain along the length direction of the second guiding groove. The length of the second guiding groove can be slightly larger than the limit inclination amount of the optical curtain along the length direction of the second guiding groove to avoid interference with the guiding roller when the guiding roller limits the pitching angle of the optical curtain.

[0108] In some embodiments, the length direction of the second guiding groove is the horizontal direction or a direction with an acute angle to the horizontal direction. Exemplarily, when the guiding roller moves along the length direction of the second guiding groove, there can be a movement component in the horizontal direction. Therefore, the optical curtain can be pressed or pushed in the horizontal direction, and further, the included angle between the optical curtain and the vertical direction can be adjusted or eliminated, so as to realize the limitation of the pitching angle of the optical curtain when the guiding roller presses against the optical curtain.

[0109] It should be noted that the angle of the second guiding groove can be set according to the target pitch angle of the optical curtain, as long as the guiding roller that can move along the length direction of the second guiding groove can limit the pitch angle of the optical curtain to the target pitch angle. The embodiments of the present application do not limit this.

[0110] In some embodiments, lubricating members that are closely attached to the inner wall of the second guiding groove can be arranged on the inner wall of each second guiding groove. In this way, the friction between the guiding roller and the second guiding groove can be reduced, the smoothness of the movement of the guiding roller in the second guiding groove can be enhanced, and at the same time, it is convenient to improve the movement accuracy of the guiding roller.

[0111] In some embodiments, when the guiding roller has a strip-shaped structure, the length direction of the guiding roller is parallel to the axial direction of the curling assembly. In this way, the flatness of the optical curtain can be ensured, and the phenomenon that the optical curtain is distorted due to the presence of the guiding roller can be avoided.

[0112] In some embodiments, in the horizontal direction, when the intersection line between the optical curtain and the curling assembly is located between the first end and the second end of the lifting assembly, the guiding roller presses the optical curtain on the side of the optical curtain close to the lifting assembly. In this way, when the intersection line between the optical curtain and the curling assembly is located between the first end and the second end of the lifting assembly, since the first side of the optical curtain is fixedly connected to the curling assembly and the second side of the optical curtain is fixedly connected to the second end of the lifting assembly, the intersection line between the optical curtain and the curling assembly is close to the first side of the optical curtain. In this way, relative to the vertical direction, the optical curtain is inclined towards the lifting assembly. Further, the guiding roller located on the side of the optical curtain close to the lifting assembly can press and push the optical curtain to make the optical curtain away from the lifting assembly, so that the correction of the pitch angle of the optical curtain can be realized.

[0113] Among them, the intersection line between the optical curtain and the curling assembly is a line along the length direction of the curling assembly at the position where the optical curtain curled on the curling assembly is about to leave the curling assembly, that is, a line along the length direction of the curling assembly at the tangent point between the unfolded part of the optical curtain and the curling assembly.

[0114] It should be noted that when the lifting assembly includes a cross beam, in this embodiment, the second end of the lifting assembly can specifically be a side edge on the cross beam fixedly connected to the optical curtain. It should also be noted that the angle between the cross beam and the horizontal plane will change due to the pulling force of the optical curtain, that is, the relative positions of the two side edges along the length direction of the cross beam in the vertical direction will change due to the pulling force of the optical curtain. Therefore, the positional relationship among the intersection line between the optical curtain and the curling assembly, the first end and the second end of the lifting assembly will change due to the change of the cross beam. Therefore, the cross beam will affect the setting of the guiding roller to a certain extent.

[0115] In some other embodiments, in the horizontal direction, when the intersection line between the optical curtain and the curling component is located on the side close to the second end of the lifting component, the guiding roller presses the optical curtain on the side of the optical curtain away from the lifting component. In this way, when the intersection line between the optical curtain and the curling component is located on the side close to the second end of the lifting component, since the first side edge of the optical curtain is fixedly connected to the curling component and the second side edge of the optical curtain is fixedly connected to the second end of the lifting component, the intersection line between the optical curtain and the curling component is close to the first side edge of the optical curtain. In this way, relative to the vertical direction, the optical curtain is inclined in the direction away from the lifting component. Further, the guiding roller located on the side of the optical curtain away from the lifting component can press and push the optical curtain to make the optical curtain close to the lifting component, so that the pitching angle of the optical curtain can be corrected.

[0116] It should be noted that in the above two embodiments, the inclination of the lifting component is the inclination of the second end of the lifting component towards the direction where the optical curtain is located. When the inclination of the lifting component is the inclination of the second end of the lifting component towards the direction away from the location of the optical curtain, the intersection line between the optical curtain and the curling component is located on the side close to the first end of the lifting component. At this time, the guiding roller presses the optical curtain on the side of the optical curtain away from the lifting component.

[0117] It should also be noted that in the above two embodiments, the guiding roller corrects the pitching angle of the optical curtain in the area between the guiding roller and the second end of the lifting component. Therefore, the guiding roller is arranged at a position close to the curling component to ensure large-area adjustment of the optical curtain.

[0118] In some embodiments, the guiding roller may include two guide rollers. The two guide rollers are designed with a gap, and the two ends of the two guide rollers are fixedly connected. The optical curtain passes through the gap between the two guide rollers. In this way, in the horizontal direction, whether the intersection line between the optical curtain and the curling component is located between the first end and the second end of the lifting component, or the intersection line between the optical curtain and the curling component is located on the side close to the second end of the lifting component, any one of the two guide rollers can press and push the optical curtain, so that the pitching angle of the optical curtain can be corrected.

[0119] It should be noted that when the lifting component rises to unfold the optical curtain, the curling component can rotate clockwise or counterclockwise. When the central axis position of the curling component remains unchanged, the position of the intersection line between the clockwise rotating curling component and the optical curtain, and the position of the intersection line between the counterclockwise rotating curling component and the optical curtain will be different. Therefore, the relationship among the intersection line between the optical curtain and the curling component, the first end of the lifting component, and the second end of the lifting component will be different.

[0120] Next, a detailed explanation will be given for the case where the projection screen includes a first adjustment mechanism.

[0121] In the embodiment of the present application, the projection screen further includes a first adjustment mechanism. The lifting assembly includes multiple groups of brackets and crossbeams. Each group of brackets includes a first support rod and a second support rod. There are rotatable connections between the first end of the first support rod and the base, between the second end of the first support rod and the first end of the second support rod, and between the second end of the second support rod and the crossbeam. The multiple groups of brackets can control the unfolding of the optical curtain. The first adjustment mechanism is connected to the second end of the first support rod and the first end of the second support rod, and is used to adjust the relative positions of the second end of the first support rod and the first end of the second support rod to adjust the pitching angle of the optical curtain.

[0122] In this way, when the optical curtain is in the unfolded state, by adjusting the relative positions of the second end of the first support rod and the first end of the second support rod through the first adjustment mechanism, the inclination angle of the second support rod can be adjusted. Since the second end of the second support rod is connected to the optical curtain through the crossbeam, the pitching angle of the optical curtain can be adjusted.

[0123] In the embodiment of the present application, in order to realize the adjustment of the relative positions of the second end of the first support rod and the first end of the second support rod by the first adjustment structure, in some embodiments, the first adjustment mechanism includes a first limiting plate, a second limiting plate, and an adjustment bolt; the first limiting plate and the second limiting plate are arranged oppositely, at least part of the second end of the first support rod and at least part of the first end of the second support rod are located between the first limiting plate and the second limiting plate, and the adjustment bolt connects the first limiting plate and the second limiting plate and is used to adjust the distance between the first limiting plate and the second limiting plate.

[0124] In this way, when the second support rod inclines, the distance between the first limiting plate and the second limiting plate can be shortened by adjusting the bolt, and then the distance between the second end of the first support rod and the first end of the second support rod can be shortened to realize the adjustment of the relative positions of the second end of the first support rod and the first end of the second support rod.

[0125] Among them, the number of adjustment bolts is multiple. By multiple adjustment bolts, it is ensured that the first limiting plate and the second limiting plate are parallel to each other, so as to ensure the adjustment of the inclination angle of the second support rod. For example, three adjustment bolts are connected to the first limiting plate and the second limiting plate, and the three adjustment bolts enclose a polygon.

[0126] When the optical curtain is curled, the first support rod and the second support rod rotate relative to each other. At this time, in order to avoid the obstruction of multiple adjustment bolts, the multiple adjustment bolts can be connected to the outside of the corner formed by the first support rod and the second support rod.

[0127] In addition, when adjusting the relative positions of the second end of the first support rod and the first end of the second support rod through the first limiting plate and the second limiting plate, in order to facilitate the subsequent relative rotation between the first support rod and the second support rod, lubricating coatings are provided on the two opposite surfaces of the first limiting plate and the second limiting plate, thereby reducing the frictional force between the first support rod and the second support rod and the first limiting plate and the second limiting plate during relative rotation through the lubricating coatings.

[0128] In some other embodiments, the first adjusting mechanism is an adjusting screw. One of the first support rod and the second support rod is connected with the adjusting screw, and one end of the adjusting screw abuts against the side wall of the other. Exemplarily, the adjusting screw is connected to the first support rod, and one end of the adjusting screw abuts against the side wall of the second support rod. In this way, when the second support rod is tilted, the abutting force of the adjusting screw against the first end of the second support rod can be adjusted to realize the adjustment of the relative position between the second end of the first support rod and the first end of the second support rod, thereby realizing the adjustment of the tilt angle of the second support rod.

[0129] In some embodiments, the number of sets of brackets is set to two. In this way, one set of brackets is respectively arranged at positions near both ends of the curling assembly, and the two sets of brackets unfold the optical curtain based on two ends close to one side edge of the optical curtain. Of course, the number of sets of brackets can also be set to three. In this way, one set of brackets is respectively arranged at positions near both ends of the curling assembly, and one set of brackets is arranged at a position near the middle of the curling assembly. In this way, the three sets of brackets can unfold the optical curtain based on two ends close to one side edge of the optical curtain and the center position close to this side edge of the optical curtain.

[0130] In some embodiments, each set of brackets includes a first connecting shaft. The second end of the first support rod has a first connecting groove, the first end of the second support rod extends into the first connecting groove, and the first connecting shaft passes through the groove wall of the first connecting groove and the first end of the second support rod.

[0131] Among them, when the first adjusting mechanism includes a first limiting plate, a second limiting plate and an adjusting bolt, the part of the first support rod on the side of the second support rod, and the second support rod are located between the first limiting plate and the second limiting plate. When the first adjusting mechanism is an adjusting screw, one end of the adjusting screw is screwed along the outer wall of the first support rod into the first connecting groove and abuts against the outer wall of the second support rod.

[0132] Among them, the shape of the bottom surface of the first connecting groove can be set according to the shape of the first support rod. Exemplarily, when the cross-sectional shape of the first support rod is square, the shape of the bottom surface of the first connecting groove is also square; when the cross-sectional shape of the first support rod is circular, the shape of the bottom surface of the first connecting groove is also circular.

[0133] Wherein, a fixing nut is respectively arranged at both ends of the first connecting shaft, and each fixing nut is respectively pressed against the side wall of the first supporting rod after being tightened. In this way, the first connecting shaft is fixedly connected to the first supporting rod, and then when the second supporting rod rotates around the first connecting shaft, the angle between the second supporting rod and the first supporting rod can be changed, so that the bracket can be extended and folded.

[0134] In some embodiments, the first support rod includes a rod body and two first connecting plates; the first end of the rod body is rotatably connected to the base, and the two first connecting plates are relatively arranged at the ends of the second end of the rod body to form a first connecting groove.

[0135] When the first adjustment mechanism includes a first limit plate, a second limit plate and an adjustment bolt, the end of a first connecting plate and a second support rod is located between the first limit plate and the second limit plate. Thus, by closing the distance between the first limit plate and the second limit plate by the adjustment bolt, the distance between a first connecting plate and a first end of the second support rod is further closed, so as to adjust the relative position of the second end of the first support rod and the first end of the second support rod.

[0136] When the first adjustment mechanism is an adjustment screw, at least one adjustment screw is provided on at least one first connecting plate. In this way, the adjustment screw provided on the first connecting plate can be rotated so that the adjustment screw pushes the second support rod, thereby adjusting the relative position of the second support rod and the first support rod.

[0137] The two first connecting plates can be arranged opposite to each other and fixedly connected to the side wall of the rod body to form a first connecting groove with a larger space. The two first connecting plates can be welded to the rod body respectively, or can be integrally formed with the rod body respectively, which is not limited in the embodiment of the present application.

[0138] Wherein, an adjustment screw may be provided on any one of the two first connection plates, and the adjustment screw and the first connection shaft are not located at the same height. In this way, when the adjustment screw is rotated, the first connection shaft can be used as a fulcrum to abut the second support rod and push the second support rod, thereby adjusting the inclination angle of the second support rod to achieve the adjustment of the relative position of the first end of the second support rod and the second end of the first support rod.

[0139] Of course, two adjustment screws can also be set on any of the first connecting plates, and the straight line formed by the two adjustment screws can be along the vertical direction or at an acute angle to the vertical direction, which is not limited in the embodiments of the present application. In actual use, the two adjustment screws can be used in combination. Specifically, the adjustment screw located at the top is kept fixed and abutted against the side wall of the second support rod, and the other adjustment screw is rotated so that the adjustment screw pushes the second support rod. In this way, the second support rod can be controlled to swing in a direction perpendicular to the line connecting the two adjustment screws, so that the inclination angle of the second support rod can be adjusted to achieve the adjustment of the relative position of the first end of the second support rod and the second end of the first support rod.

[0140] Of course, three adjustment screws may also be provided on any first connecting plate, and the three adjustment screws may form a polygon. In this way, the three adjustment screws constrain the second support rod at three locations, and the ends of the three adjustment screws form a plane, thereby effectively preventing the second support rod from shaking randomly toward the plane where the ends of the three adjustment screws are located, thereby making the motion state of the second support rod more stable.

[0141] It should be noted that one, two or three adjustment screws can be set on each first connecting plate. Since the first end of the second support rod extends into the first connecting groove formed by the two first connecting plates, the adjustment screws on the two first connecting plates push the second support rod in opposite directions, thereby realizing reciprocating adjustment of the inclination angle of the second support rod, and then realizing the adjustment of the relative position of the first end of the second support rod and the second end of the first support rod.

[0142] In some embodiments, the projection screen may further include an adjustment washer; the adjustment washer is located in the first connection groove and is slidably sleeved on the first connection shaft, and the adjustment washer is clamped between one end of the adjustment screw and the side wall of the second support rod. In this way, the adjustment screw directly abuts against the adjustment washer, so that the thrust applied by the end of the adjustment screw to the second support rod is dispersed through the adjustment washer, thereby making the force on the second support rod more uniform, and avoiding stress concentration caused by direct contact between the adjustment screw and the side wall of the second support rod, and the phenomenon of uneven force.

[0143] The adjustment gasket may be a circular thin sheet structure. Of course, it may also be a square, triangular or other shaped structure, which is not limited in the embodiments of the present application. It should be noted that when the first support rod includes a first connecting plate, in order to enable the adjustment screws set at any position of the first connecting plate to abut against the adjustment gasket, the shape of the adjustment gasket may be set to be similar to the shape of the first connecting plate.

[0144] Wherein, the thickness of the adjusting gasket can be much smaller than the gap width between the second end of the first support rod and the first end of the second support rod along the length direction of the first connecting shaft, so that the adjusting screw can freely adjust the positional relationship between the first support rod and the second support rod. Exemplarily, the thickness of the adjusting gasket can be one-sixth of the width of the gap.

[0145] In the embodiment of the present application, the first end of the first support rod and the base, and the second end of the second support rod and the cross beam are both rotatably connected. In order to achieve rotation, assembly gaps are reserved. In this case, with the existence of the assembly gaps, the first support rod will also tilt relative to the base, and the cross beam will also tilt relative to the second support rod, thus causing the tilt of the optical curtain.

[0146] Therefore, in some embodiments, the projection device further includes a second adjusting mechanism. The second adjusting mechanism is connected to the first end of the first support rod and the base, and the second adjusting mechanism is used to adjust the relative position between the first end of the first support rod and the base. In this way, the relative position between the first support rod and the base can be adjusted through the second adjusting mechanism to achieve the adjustment of the tilt angle of the first support rod.

[0147] Wherein, the structure of the second adjusting mechanism can refer to the structure of the first adjusting mechanism described in the above embodiments, and the embodiments of the present application will not elaborate on this.

[0148] In a specific implementation, each group of brackets further includes a second connecting shaft; the base has a second connecting groove, the first end of the first support rod extends into the second connecting groove, and the second connecting shaft passes through the first end of the first support rod and the groove wall of the second connecting groove.

[0149] Wherein, the connection manner of the second adjusting mechanism between the first end of the first support rod and the base can refer to the connection manner of the first adjusting mechanism between the second end of the first support rod and the first end of the second support rod. The structure of the second connecting groove is the same as or similar to the structure of the first connecting groove, and the embodiments of the present application will not elaborate on this.

[0150] In addition, when the second adjusting mechanism is an adjusting screw, an adjusting gasket is arranged in the second connecting groove, and the adjusting gasket is slidably sleeved on the second connecting shaft. The adjusting gasket is clamped between one end of the adjusting screw and the side wall of the first support rod. In addition, the function and shape of the adjusting gasket are the same as or similar to the function and shape of the adjusting gasket in the above embodiments, and the embodiments of the present application will not elaborate on this.

[0151] In some embodiments, the projection device further includes a third adjustment mechanism. The third adjustment mechanism is connected to the second end of the second support rod and the cross beam, and is used to adjust the relative positions of the second end of the second support rod and the cross beam. In this way, the relative positions of the second support rod and the cross beam can be adjusted through the third adjustment mechanism to achieve the adjustment of the tilt angle of the cross beam.

[0152] Among them, the structure of the third adjustment mechanism can refer to the structure of the first adjustment mechanism described in the above embodiments, and the embodiments of the present application will not elaborate on this.

[0153] In a specific implementation, each group of brackets further includes a third connecting shaft; the cross beam has a third connecting groove, the second end of the second support rod extends into the third connecting groove, and the third connecting shaft passes through the second end of the second support rod and the groove wall of the third connecting groove.

[0154] Among them, the connection manner of the third adjustment mechanism between the second end of the second support rod and the cross beam can refer to the connection manner of the first adjustment mechanism between the second end of the first support rod and the first end of the second support rod. The structure of the third connecting groove is the same as or similar to the structure of the first connecting groove, and the embodiments of the present application will not elaborate on this.

[0155] In addition, when the third adjustment mechanism is an adjustment screw, an adjustment gasket is also provided in the third connecting groove, and the adjustment gasket is slidably sleeved on the third connecting shaft, and the adjustment gasket is clamped between one end of the adjustment screw and the side wall of the second support rod. Similarly, the function and shape of the adjustment gasket are the same as or similar to the function and shape of the adjustment gasket in the above embodiments, and the embodiments of the present application will not elaborate on this.

[0156] In some embodiments, a protective coating is provided on the back of the optical curtain 23, that is, the side of the optical curtain 23 facing the lifting assembly 22. In this way, when the optical curtain 23 is in a curled state, the back of the optical curtain 23 is in direct contact with the front of the optical curtain 23, so that the protective coating can prevent the back and front of the optical curtain 23 from rubbing against each other, resulting in wear of the optical curtain 23, thereby extending the service life of the optical curtain 23.

[0157] Among them, the protective coating can be a coating composed of flexible particles or a colloidal coating, and the embodiments of the present application do not limit this. The protective coating can be made of nanomaterials, and the nanomaterials have good toughness, impact resistance, and thermal stability. Furthermore, after the protective coating contacts the optical curtain 23, it can also improve the flatness, wind resistance, and stability of the optical curtain 23, and can extend the life of the optical curtain 23.

[0158] In some embodiments, the optical curtain 23 includes an optical film and a rollable substrate, the optical film is bonded to the rollable substrate, and a plurality of reinforcing ribs may be provided on the side of the rollable substrate away from the optical film, and the length direction of each reinforcing rib is not parallel to the longitudinal direction of the rollable substrate; the rollable substrate may be fixedly connected to the rolling assembly 21, and the rolling assembly 21 can roll the rollable substrate on the rolling assembly 21. The rollable substrate is also fixedly connected to the second end of the lifting assembly 22, and the lifting assembly 22 can control the rollable substrate to unfold, and the rollable substrate supports the optical film in a flat state when unfolded; the optical film is used to reflect the light beam emitted by the optical engine 1 to display the picture.

[0159] In this way, the multiple reinforcing ribs can enhance the strength of the rollable substrate, while facilitating the rollability of the rollable substrate, and when the rollable substrate is in a flat state, the rollable substrate is subjected to uniform force in the lateral direction, and is not prone to ripples and wrinkles. Since the optical film is bonded to the rollable substrate, the optical film is not prone to wrinkles and deformation, thereby improving the display effect of the optical film.

[0160] In other embodiments, the optical curtain 23 includes an optical film and a flexible carrier; the optical film is bonded to the flexible carrier, the flexible carrier is fixedly connected to the curling component 21, and the curling component 21 can control the flexible carrier to curl on the curling component 21; the second end of the lifting component 22 is also fixedly connected to the flexible carrier, and the lifting component 22 can be tightened to unfold the flexible carrier, and the flexible carrier supports the optical film in a flat state when it is unfolded.

[0161] In this way, while the lifting assembly 22 indirectly tightens the optical film through the flexible carrier, the flexible carrier can bear a part of the tensioning force of the lifting assembly 22, so that the optical film is not easily damaged, thereby ensuring the flatness of the optical film.

[0162] The flexible carrier may be a carrier that is easy to curl and has load-bearing strength, such as synthetic cloth or film. When the flexible carrier is a synthetic cloth, the material of the flexible carrier may be a synthetic material containing nylon. Since nylon material has high mechanical strength, good toughness, and high tensile and compressive strength, the flexible carrier is not easily deformed when being tightened by the lifting assembly 22, and the surface is flat, thereby improving the flatness of the optical film. Of course, the material of the flexible carrier may also be other materials, which is not limited in the embodiments of the present application.

[0163] The optical film and the flexible carrier may be bonded together by double-sided tape or adhesive film, or by other methods, which is not limited in the embodiments of the present application.

[0164] In still other embodiments, the optical curtain 23 simultaneously includes an optical film, a rollable substrate, and a flexible carrier. The optical film is adhered to the rollable substrate, and the side of the rollable substrate away from the optical film is adhered to the flexible carrier. The flexible carrier is fixedly connected to the curling assembly 21. The curling assembly 21 can control the flexible carrier to curl around the curling assembly 21. The flexible carrier is also fixedly connected to the second end of the lifting assembly 22, and the lifting assembly 22 can control the flexible carrier to unfold. When the flexible carrier unfolds, it supports the rollable substrate to be in a flat state.

[0165] In the embodiments of the present application, the curling assembly 21 includes a curling controller, a curling motor, and a reel. The curling controller is electrically connected to the curling motor. The curling motor can be fixed on the base 25. The output shaft of the curling motor is fixedly connected to the end of the reel. The optical curtain 23 is fixedly connected to the reel. Among them, the curling controller can control the start and stop of the curling motor. After the curling motor is started, it can drive the reel to rotate. In this way, when the curling controller controls the reel to rotate, the optical curtain 23 can be controlled to curl around the reel.

[0166] When realizing the fixation of the optical curtain 23 and the reel, a card slot is axially provided on the outer wall of the reel, and a card strip matching the card slot is provided on one side edge of the optical curtain 23. The card strip can be radially limited in the card slot along the reel, so as to realize the circumferential limitation of the optical curtain 23 along the reel.

[0167] In this way, when the reel rotates, the synchronous curling of the optical curtain 23 and the reel can be realized through the limitation of the card strip, so that the optical curtain 23 can be curled around the reel. And due to the limitation of the card strip, the reel can provide a certain pulling force on one side edge of the optical curtain 23. This pulling force can cooperate with the action when the other side edge opposite to one side edge of the optical curtain 23 unfolds, so that the optical curtain 23 is flatter, thereby improving the display effect of the optical curtain 23.

[0168] It should be noted that when the tensioning mechanism 24 includes a tensioning component 242 and the tensioning component 242 is the first auxiliary cloth, the connection manner between the first auxiliary cloth and the curling assembly 21 is the same as or similar to the connection manner between the above-mentioned optical curtain 23 and the curling assembly 21. When the curling assembly 21 includes a first sub-curling assembly and a second sub-curling assembly, the structures of the first sub-curling assembly and the second sub-curling assembly are both the same as the structure of the above-mentioned curling assembly 21. When the tensioning mechanism 24 is the second auxiliary cloth, the connection manner between the second auxiliary cloth and the second sub-curling assembly can be the same as the connection manner between the above-mentioned optical curtain 23 and the curling assembly 21. Of course, the connection manner between the optical curtain 23 and the first sub-curling assembly can also be the same as the connection manner between the above-mentioned optical curtain 23 and the curling assembly 21. The embodiments of the present application will not elaborate on this anymore.

[0169] In the embodiment of the present application, the lifting assembly 22 further includes a lifting controller and a lifting motor. The lifting controller is electrically connected to the lifting motor, and the lifting motor is fixed on the base 25. The lifting controller can control the start and stop of the lifting motor, and the lifting motor can adjust the distance between the second end of the second support rod 222 and the curling assembly 21.

[0170] In this way, after the lifting controller controls the lifting motor to start, the lifting motor can drive the bracket to rise. Furthermore, the second end of the second support rod 222 included in the bracket can drive the optical curtain 23 to rise. At this time, the optical curtain 23 can be unfolded while the curling assembly 21 controls the optical curtain 23 to rotate in the reverse direction. In addition, when the lifting motor drives the bracket to descend, it can drive the optical curtain 23 to descend. At this time, the optical curtain 23 can be retracted while the curling assembly 21 controls the optical curtain 23 to rotate in the forward direction.

[0171] In the embodiment of the present application, as Figure 10 shown, the projection device further includes a base 3. The base 3 is used to accommodate the optical engine 1 and the projection screen 2. When the projection screen 2 is in the unfolded state, there is a fixed preset distance between the optical engine 1 and the projection screen 2. In this way, when the projection device is not in use, the optical engine 1 and the projection screen 2 can be accommodated in the base 3, which is convenient for saving space. When the projection device is in use, the projection screen 2 can be unfolded, and at the same time, the optical engine 1 can project a light beam onto the projection screen 2 so that the projection screen 2 displays an image. And the base 3 can keep a fixed preset distance between the optical engine 1 and the projection screen 2, thereby maintaining a preset projection ratio.

[0172] It should be noted that when the projection screen 2 includes a curling assembly 21, a lifting assembly 22, an optical curtain 23, and a tensioning mechanism 24, the curling assembly 21, the lifting assembly 22, the optical curtain 23, and the tensioning mechanism 24 can all be accommodated in the base 3, and the lifting assembly 22, the optical curtain 23, and the tensioning mechanism 24 can also be unfolded simultaneously. When the projection screen 2 includes other structures, the other structures can also be accommodated in the base 3 and can also be unfolded simultaneously.

[0173] In some embodiments, the base 3 includes a first accommodating portion and a second accommodating portion. The optical engine 1 is disposed in the inner cavity of the first accommodating portion. The first accommodating portion is provided with a light-transmitting area, and the light beam emitted by the optical engine 1 can pass through the light-transmitting area. The curling assembly 21 and the lifting assembly 22 are disposed in the inner cavity of the second accommodating portion. The curling assembly 21 can control the optical curtain 23 and the tensioning mechanism 24 to be retracted into the second accommodating portion. The second accommodating portion is provided with an opening, and the lifting assembly 22 controls the optical curtain 23 and the tensioning mechanism 24 to extend out of the opening and unfold.

[0174] It should be noted that when the tensioning mechanism 24 includes the auxiliary roller 241 and the tensioning component 242, the auxiliary roller 241 may be located inside the base 3, or may also be located above the base 3. The embodiments of the present application do not limit this. Generally, the auxiliary roller 241 is arranged inside the base 3, and the central axis of the auxiliary roller 241 and the central axis of the curling component 21 are located in the same horizontal plane. In this way, when the auxiliary roller 241 is pressed against the tensioning component 242, since the auxiliary roller 241 is close to the first end of the lifting component 22, it can be ensured that the position from the position close to the first end of the lifting component 22 to the position close to the second end of the lifting component 22 will not contact the tensioning component 242. Therefore, the contact area between the tensioning component 242 and the lifting component 22 can be significantly reduced, thereby avoiding the interference of the lifting component 22 on the tensioning component 242.

[0175] In the embodiments of the present application, when the projection device is not in use, the optical screen and the tensioning mechanism can be curled up by the curling component, thereby reducing the space occupied by the projection screen. When the projection device is in use, the optical screen and the tensioning mechanism can be tightened by the lifting component to facilitate the optical screen to reflect the light beam emitted by the optical engine and display the picture. When the optical screen and the tensioning mechanism are in the unfolded state, since the lifting component is located between the optical screen and the tensioning mechanism, the tension of the tensioning mechanism on the second end of the lifting component can be balanced with the tension of the optical screen on the second end of the lifting component. In this way, the tensioning mechanism can limit the pitching angle of the optical screen and correct the pitching angle of the optical screen at the same time, thereby avoiding problems such as distortion and blurring of the picture displayed on the optical screen, and improving the display effect of the projection screen. When the tensioning mechanism includes an auxiliary roller and a tensioning component, the auxiliary roller can be pressed against the tensioning component, so as to control the tensioning component to tension the lifting component to balance the tension of the optical screen on the lifting component. When the projection screen includes a curlable substrate, the support strength of the curlable substrate is high and the force is evenly distributed, so the optical screen adhered to the curlable substrate is not likely to wrinkle and deform. In addition, the base can accommodate the optical engine and the projection screen, thereby reducing the space occupation when the projection device is not in use.

[0176] The above are only illustrative embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A projection device, characterized in that, The projection device comprises: An optical engine, the optical engine being used for emitting a light beam; A projection screen, comprising a base, a curling assembly, a lifting assembly, an optical screen and a tensioning mechanism; The curling assembly is arranged on the base, the optical curtain and the tensioning mechanism are both fixedly connected to the curling assembly, the first end of the lifting assembly is fixedly connected to the base, the optical curtain and the tensioning mechanism are also both fixedly connected to the second end of the lifting assembly, and the lifting assembly is located between the optical curtain and the tensioning mechanism; When the optical curtain is unfolded, it reflects the light beam emitted by the optical engine to display the picture, and when the tensioning mechanism is unfolded, it tightens the second end of the lifting assembly; The projection screen also includes a guide roller, which is pressed against the optical curtain, and the side wall of the base has a second guide groove, and the guide roller passes through the second guide groove and is movable along the length direction of the second guide groove to achieve a change in the pitch angle of the optical curtain, wherein the length direction of the second guide groove is a horizontal direction or a direction that forms an acute angle with the horizontal direction.

2. The projection device according to claim 1, characterized in that, The crimping assembly includes a first sub-crimping assembly and a second sub-crimping assembly; The first sub-curling assembly and the second sub-curling assembly are both connected to the base, the first sub-curling assembly and the optical curtain are located on a first side of the lifting assembly, and the second sub-curling assembly and the tensioning mechanism are located on a second side of the lifting assembly; The optical curtain is fixedly connected to the first sub-curling assembly, and the tensioning mechanism is fixedly connected to the second sub-curling assembly.

3. The projection device according to claim 1, characterized in that, The tensioning mechanism comprises an auxiliary roller and a tensioning assembly; The first end of the tensioning assembly is fixedly connected to the second end of the lifting assembly, the second end of the tensioning assembly is fixedly connected to the curling assembly, both ends of the auxiliary roller are connected to the side walls of the base, and the auxiliary roller is pressed against the tensioning assembly.

4. The projection device according to claim 3, characterized in that, Both ends of the auxiliary roller are rotatably connected to the side walls of the base.

5. The projection device according to claim 3, characterized in that, Both ends of the auxiliary roller are limitedly connected to the side walls of the base.

6. The projection device according to claim 5, characterized in that, The side wall of the base has a first guide groove, and the end of the auxiliary roller passes through the first guide groove and can move along the length direction of the first guide groove.

7. The projection device according to claim 6, characterized in that, The projection screen further comprises a control mechanism, which is drivingly connected to the auxiliary roller, and is used for driving the auxiliary roller to move along the length direction of the first guide groove.

8. The projection device according to claim 5, characterized in that, The auxiliary roller comprises a central shaft and a roller. Both ends of the central shaft are limitedly connected to the side walls of the base. The roller is rotatably sleeved on the central shaft and is pressed tightly on the tensioning assembly.

9. The projection device according to any one of claims 3 - 8, characterized in that, The auxiliary roller has a lubricating coating.

10. The projection device according to any one of claims 3 - 8, characterized in that, The auxiliary roller is in a strip-shaped structure, and the length direction of the auxiliary roller is parallel to the axial direction of the curling component.

11. The projection device according to any one of claims 3 - 8, characterized in that, The tensioning component is a first auxiliary cloth or a plurality of first tensioning ropes.

12. The projection device according to claim 1, characterized in that, The projection device comprises a base, and the base is used to store the optical engine and the projection screen. When the projection screen is in an unfolded state, the optical engine has a fixed preset distance from the projection screen.

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