Projection screen lifting device, projection screen and laser television

Abstract

The present invention discloses a lifting device for a projection screen, a projection screen and a laser TV, wherein the lifting device includes a screw slider mechanism, a beam support mechanism and a beam. The screw slider mechanism includes a screw and a slider. One end of the beam support mechanism is hinged or fixedly connected to the corresponding slider to form a first hinge point or a first connection point. The other end of the beam support mechanism is hinged to the beam to form a second hinge point. The slider can move along the length direction of the screw to adjust the straight-line distance between the first hinge point or the first connection point and the beam. There are two screw slider mechanisms and two beam support mechanisms, and they are symmetrically distributed about the median perpendicular line of the beam. The lifting device of the present invention can adjust the height by the separate or simultaneous action of the screw slider and the beam support mechanism, and the adjustment range is large to meet the use requirements of different screen heights. Adjusting the support angle of the lifting device can also adapt to different tension requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting devices, and in particular to a lifting device for a projection screen, a projection screen, and a laser television. Background Art

[0002] Projection equipment generally needs to display images by projecting them onto a projection screen. Projection screens can be divided into soft screens and hard screens. The soft screen is mainly supported by the screen frame. The screen is tensioned and fixed to the frame by means of springs, Velcro, etc. The screen and frame parts are in a disassembled state during transportation and are installed on site, which is relatively low in cost. The hard screen uses a thin and lightweight plate (usually a honeycomb aluminum plate) as the back panel, and the screen is attached to the surface of the back panel. The outside is decorated with a frame. The hard screen is installed at the factory and has good flatness and aesthetics, but it also has the disadvantages of easy deformation, difficult transportation, and high cost. However, whether it is a soft screen or a hard screen, the fixed structure always has the following problems:

[0003] 1. After installation, the structure remains basically unchanged. Regardless of whether it is being watched or not, it will occupy a certain amount of wall space. Moreover, the screen surface is mostly dark, which affects the appearance, and the height and support angle cannot be adjusted at any time.

[0004] 2. Due to the need to coordinate with the projection equipment, the installation process requires repeated adjustments to the installation position of the projection equipment or screen. Once installed, the screen position is fixed and difficult to adjust. If the projection equipment is not fixed, it is easy to move during daily use. Therefore, a fixed screen is not very convenient for daily use of the projection equipment.

[0005] 3. The screen substrate is a thin, flexible film. Fixed screens lack surface protection during daily use, which can lead to scratches, scrapes, and creases, which can damage the surface microstructure and paint film, thus affecting the overall display quality.

[0006] 4. The liftable screen either needs to be manually unfolded or rolled up, which is not convenient, or requires a thicker support structure, which is not beautiful when viewed from the side or back. Summary of the Invention

[0007] The main technical problem solved by the present invention is: to provide a lifting device for a projection screen, a projection screen and a laser TV, which can adjust the height of the projection screen and adapt to different tension requirements by adjusting the support angle of the lifting device.

[0008] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a lifting device for a projection screen, including a screw slider mechanism, a beam support mechanism and a beam, and the screw slider mechanism includes a screw and a slider. One end of the beam support mechanism is hinged or fixedly connected to the corresponding slider, thereby forming a first hinge point or a first connection point. The other end of the beam support mechanism is hinged to the beam, thereby forming a second hinge point. The slider can move along the length direction of the screw, thereby adjusting the straight-line distance between the first hinge point or the first connection point and the beam. The number of the screw slider mechanism and the beam support mechanism is two, and they are symmetrically distributed about the perpendicular midline of the beam.

[0009] Wherein, the beam supporting mechanism is a telescopic mechanism or a supporting rod of fixed length.

[0010] Wherein, when the crossbeam support mechanism is a retractable mechanism, the crossbeam support mechanism can be retracted and retracted along the length direction of the crossbeam support mechanism, thereby adjusting the distance between the first hinge point or the first connection point and the second hinge point.

[0011] The angle between the length direction of the screw rod and the crossbeam is an acute angle, and is smaller than the angle between the length direction of the crossbeam support mechanism and the length direction of the crossbeam.

[0012] Among them, the two screw slider mechanisms are configured to be able to move synchronously, and the two beam support mechanisms are configured to be able to move synchronously, so that the sequential connection lines of the two first hinge points or the two first connection points and the two second hinge points remain in an isosceles trapezoid; further, the connection line between the two first hinge points or the two first connection points forms the upper base of the isosceles trapezoid, the connection line between the two second hinge points forms the lower base of the isosceles trapezoid, and the connection line between the first hinge point or the first connection point and the second hinge point on the same side respectively forms the two waists of the isosceles trapezoid.

[0013] Among them, the lifting device further includes a synchronization mechanism, which is connected between the two beam support mechanisms and is used to keep the length direction of the two beam support mechanisms and the angle between the beams consistent during the synchronization process of the two screw slider mechanisms and / or the synchronization process of the two beam support mechanisms.

[0014] The synchronization mechanism includes an upright column, a connecting rod, and two sleeves. The upright column is provided with a first guide groove perpendicular to the crossbeam. The connecting rod is configured to slide up and down along the first guide groove, with its ends symmetrically arranged about the mid-perpendicular axis. The two sleeves are hinged to the ends of the connecting rod and sleeved onto the corresponding crossbeam support mechanism, allowing the crossbeam support mechanism to extend and retract along its length under the constraints of the sleeves.

[0015] The synchronization mechanism further includes a column guide rail, which is provided with a second guide groove extending parallel to the mid-vertical line, and the column is configured to slide along the second guide groove.

[0016] The screw-slider mechanism also includes a base, a slider guide rail mounted on the base, a coupling, and a first motor. The screw is rotatably supported on the base. The slider is sleeved onto the screw and engages with the screw thread. The slider is further configured to slide along the slider guide rail. One end of the coupling is connected to the screw, and the other end is connected to the output shaft of the first motor.

[0017] When the crossbeam support mechanism is a telescopic mechanism, the crossbeam support mechanism includes a housing, a telescopic rod, a screw, a nut, and a second motor. The telescopic rod is disposed within the housing, the screw is disposed within the telescopic rod and is connected to the output end of the second motor, and the nut is sleeved on the screw and engages with the screw thread, thereby driving the telescopic rod to extend and retract relative to the housing as the screw rotates.

[0018] In order to solve the technical problem, the present invention further provides a projection screen, wherein the projection device comprises the above-mentioned lifting device, a projection screen and a rolling screen mechanism;

[0019] One end of the projection screen is connected to the crossbeam of the lifting device, and the other end is connected to the rolling screen mechanism; when the lifting device unfolds the screen, the rolling screen mechanism unwinds the projection screen, and when the lifting device retracts the screen, the rolling screen mechanism rewinds the projection screen.

[0020] In order to solve the technical problem, the present invention further provides a laser TV, which includes a laser TV host, the above-mentioned lifting device, a projection screen, a housing and a laser TV motion structure;

[0021] The laser TV host faces the projection screen and is arranged on the laser TV motion structure, and moves along with the laser TV motion structure;

[0022] The lifting device drives the projection screen to open or retract.

[0023] Among them, the laser TV also includes a screen scroll. The two opposite edges of the projection screen are respectively connected to the beam and the screen scroll. The screen scroll is used to unroll the projection screen when the beam moves away from the screen scroll, and to reel in the projection screen when the beam approaches the screen scroll.

[0024] The beneficial effects of the projection screen lifting device, projection screen and laser TV of the present invention are as follows: the lifting device can adjust the height through the separate or simultaneous actions of the screw slider and the beam support mechanism, and the adjustment range is large to meet the usage requirements of different screen heights. Adjusting the support angle of the lifting device can also adapt to different tension requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 1 is a schematic structural diagram of an embodiment of a projection screen lifting device of the present invention;

[0027] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle screw slider mechanism;

[0028] Figure 3 yes Figure 1 Front structural diagram of the central synchronization mechanism;

[0029] Figure 4 yes Figure 1 A three-dimensional diagram of the synchronization mechanism;

[0030] Figure 5 yes Figure 1 A perspective view of the center beam support mechanism;

[0031] Figure 6 yes Figure 1 Schematic diagram of the structure when the beam is at the lowest point;

[0032] Figure 7 yes Figure 1 Structural diagram when the beam is at the highest point;

[0033] Figure 8 This is a schematic diagram of the structure of a laser TV;

[0034] Figure 9 yes Figure 8 Schematic diagram of the lifting device driving the projection screen to rise;

[0035] Figure 10 This is a perspective view of the interior of the Laser TV;

[0036] Figure 11 yes Figure 10 Schematic diagram of the split structure of the middle A part;

[0037] Figure 12 This is a top view of the interior of the laser TV. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] See also Figure 1 and Figure 2 , Figure 1 1 is a schematic diagram of an embodiment of a lifting device for a projection screen according to the present invention. Figure 2 This is a schematic diagram of the structure of a screw-slider mechanism. The lifting device includes a screw-slider mechanism 2, a crossbeam support mechanism 4, and a crossbeam 5. The screw-slider mechanism 2 includes a screw 202 and a slider 203. One end of the crossbeam support mechanism 4 is hinged to the slider 203 via a first hinge point 10 to form a first hinge point, or is fixedly connected to the slider 203 via the first connection point 10 to form a first connection point. The other end of the crossbeam support mechanism 4 is hinged to the crossbeam 5 via a second hinge point 20. The crossbeam support mechanism 4 can be a fixed rod of constant length or a telescopic rod of variable length. Each of these is described below.

[0040] Example 1:

[0041] In this embodiment, the beam support mechanism 4 is a fixed rod of constant length. The slider 203 of the screw-slider mechanism 2 can move along the length of the screw 202, adjusting the position of the first hinge point 10 on the screw 202, thereby driving the vertical movement of the beam 5 to unfold or roll up the screen. In this embodiment, there are two screw-slider mechanisms 2 and two beam support mechanisms 4, each symmetrically located about the perpendicular midline of the beam 5, ensuring balanced force on both sides of the beam 5 and smooth vertical movement.

[0042] Specifically, if Figure 2 As shown, the screw slider mechanism 2 in this embodiment also includes a base 201, a slider guide rail 204 arranged on the base 201, a coupling 205 and a first motor 206; the slider guide rail 204 is tilted at a preset angle, so that the height of the beam support mechanism 4 connected to the slider 203 can be changed when the slider 203 slides thereon.

[0043] Screw 202 is rotatably supported on base 201; slider 203 is sleeved on screw 202 and engages with the threads of screw 202. Slider 203 is further configured to slide along slider guide rail 204. One end of coupling 205 is connected to screw 202, and the other end is connected to the output shaft of first motor 206. When first motor 206 is activated, it drives coupling 205 and screw 202 to rotate, causing slider 203 to move along the length of screw 202. The lower end of slider 203 contacts and slides along slider guide rail 204. Because one end of beam support mechanism 4 is hinged to slider 203, movement of slider 203 drives beam support mechanism 4 in conjunction with it, thereby changing the height of beam 5 and the angle between the length of beam support mechanism 4 and the length of beam 5 and the length of screw-slider mechanism 2.

[0044] Furthermore, the screw rod 202 used in the present invention has a self-locking capability, preventing the slider 203 from moving without external force. This ensures greater stability for the lifting device than chutes or other structures. In this embodiment, the two screw-slider mechanisms 2 and the two crossbeam support mechanisms 4 are configured to operate synchronously, thereby ensuring that the lines connecting the two first hinge points 10 and the two second hinge points 20 form an isosceles trapezoid. The line connecting the two first hinge points 10 forms the upper base of the isosceles trapezoid, the line connecting the two second hinge points 20 forms the lower base of the isosceles trapezoid, and the lines connecting the first hinge point 10 and the second hinge point 20 on the same side form the two legs of the isosceles trapezoid. The synchronized movement of the two screw-slider mechanisms 2 and the two crossbeam support mechanisms 4 maintains the horizontality of the crossbeam 5, preventing the screen mounted on the crossbeam 5 from tilting. Maintaining the lines connecting the four hinge points in an isosceles trapezoid, leveraging the relatively stable structural properties of the isosceles trapezoid, maintains the stability of the lifting device, allowing the top crossbeam 5 to be raised and lowered smoothly.

[0045] Still see Figure 1 In this embodiment, the angle a between the length direction of the screw rod 202 and the length direction of the beam 5 is an acute angle, so that the beam support mechanism 4 can change the angle with the length direction of the beam 5 when sliding on the screw slider mechanism 2, and the angle a between the length direction of the screw rod 202 and the length direction of the beam 5 is smaller than the angle b between the length direction of the beam support mechanism 4 and the length direction of the beam 5, so that the beam support mechanism 4 can be tilted as much as possible when retracted, thereby reducing the height of the vertical projection of the beam support mechanism 4, that is, minimizing the overall height of the lifting device when retracted, and reducing the space required for storage.

[0046] In order to fix the screw slider mechanism 2, a support frame 1 is also provided in this embodiment. The support frame 1 includes a first bracket 101 and a second bracket 102. One end of the first bracket 101 and the second bracket 102 are connected as a whole, and the other end is fixed to an external structure, for example, fixed in a projection device; the first bracket 101 is arranged perpendicular to the beam 5, and the second bracket 102 is arranged at an angle to the beam 5, and the screw slider mechanism 2 is fixed on the second bracket 102.

[0047] In addition, in this embodiment, the lifting device also includes a synchronization mechanism 3, which is connected between the two beam support mechanisms 4. The synchronization mechanism 3 can ensure that the two beam support mechanisms 4 slide synchronously along the slider guide rail, so that the line connecting the two first hinge points 10 or the first connection point 10 and the two second hinge points 20 always remains an isosceles trapezoid, ensuring smooth up and down movement of the lifting device.

[0048] like Figure 3 and Figure 4 As shown, the synchronization mechanism 3 includes a column 301 , a connecting rod 302 , two sleeves 303 , and a column guide rail 304 .

[0049] The upright post 301 is provided with a first guide slot 305 perpendicular to the crossbeam 5. The connecting rod 302 is configured to slide up and down along the first guide slot 305, with its ends symmetrically arranged about the mid-perpendicular axis. Two sleeves 303 are hinged to each end of the connecting rod 302 and sleeved onto the corresponding crossbeam support mechanism 4, allowing the crossbeam support mechanism 4 to extend and retract along its length within the constraints of the sleeves 303. The upright post 301 is positioned on the mid-perpendicular axis of the crossbeam 5 and is used to mount the connecting rod 302, which slides within the first guide slot 305. When the crossbeam 5 moves upward, the connecting rod 302 also slides upward within the first guide slot 305, ensuring that it remains within the constraints of the first guide slot 305. Throughout this movement, the hinge points between the connecting rod 302 and the sleeves 303 remain symmetrical, ensuring that the angles between the crossbeam support mechanisms 4 and the crossbeam 5 remain consistent along their length, keeping the crossbeam 5 horizontal. At the same time, the first guide groove 305 limits the movement direction of the connecting rod 302 to the vertical direction to prevent it from tilting during the movement.

[0050] The column guide rail 304 is provided with a second guide groove 306 extending parallel to the mid-vertical line. The column 301 is configured to slide along the second guide groove 306 so that the column 301 can slide in a direction perpendicular to the beam 5 to adjust the height of the connecting rod 302, thereby changing the adjustable range of the beam support mechanism 4.

[0051] In this embodiment, the lifting device of the projection screen can adjust the height of the beam 5 through the action of the screw slider to meet the usage requirements of different screen heights. The support angle of the lifting device can also be adjusted to adapt to different tension requirements. A synchronization mechanism 3 is set to ensure that the beam support mechanisms 4 or sliders 203 on the left and right sides can move synchronously, so that the lifting device always maintains the shape of an isosceles trapezoid and the structure is stable: the screw slider mechanism 2 can also be replaced by a telescopic rod, but the space occupied when using a telescopic rod is relatively large. The length of the screw rod 202 can be selected according to the motion range of the slider 203, and the length of the telescopic rod after contraction is at least equivalent to the motion range of the slider. Compared with the two, the use of the screw slider mechanism 2 saves more space.

[0052] Example 2:

[0053] In this embodiment, the beam support mechanism 4 is a telescopic rod with variable length, and the beam support mechanism 4 is fixedly connected to the screw slider mechanism 2. The screw slider mechanism 2 can be a fixed structure located in the same plane as the beam 5 and the beam support mechanism 4.

[0054] The beam support mechanisms 4 are connected with a synchronization mechanism 3 , and the structure of the synchronization mechanism 3 is the same as that of the synchronization mechanism 3 in the first embodiment, which can ensure that the two beam support mechanisms 4 can be extended and retracted synchronously.

[0055] When the crossbeam support mechanism 4 is extended or retracted, the distance between the first connection point 10 and the second hinge point 20 can be adjusted, thereby driving the crossbeam 5 to move up and down to expand or retract the screen.

[0056] Example 3:

[0057] In this embodiment, the crossbeam support mechanism 4 is a telescopic rod with variable length, and the crossbeam support mechanism 4 is slidably connected to the screw slider mechanism 2 via the slider 203. When the crossbeam support mechanism 4 is telescopically extended and its length changes, the slider 203 also moves under the drive of the screw 202, that is, the screw slider mechanism 2 and the crossbeam support mechanism 4 move simultaneously, and both adjust the height of the crossbeam 5 at the same time. In addition, in other variations, the crossbeam support mechanism 4 is slidably connected to the screw slider mechanism 2 via the slider 203, but the slider 203 is kept stationary, and the crossbeam support mechanism 4 is telescopically extended to adjust the height of the crossbeam 5. In actual use, the length of the crossbeam support mechanism can be kept unchanged first, and the slider moves under the drive of the screw to adjust the height of the crossbeam. Then, the slider is kept stationary, and the length of the crossbeam support mechanism is adjusted to adjust the height of the crossbeam. In this embodiment, the lifting device adjusts the height of the crossbeam 5 by sliding the crossbeam support mechanism 4 on the screw-slider mechanism 2 and by extending and retracting the crossbeam support mechanism 4. Driven by the slider 203 on the screw-slider mechanism 2, the crossbeam support mechanism 4 moves on the screw 202, thereby changing the vertical projection height of the crossbeam support mechanism 4, and therefore the height of the crossbeam 5. Simultaneously, the movement of the crossbeam support mechanism 4 on the screw-slider mechanism 2 and its own extension and retraction also change the angle between the crossbeam support mechanism 4, the crossbeam 5, and the screw-slider mechanism 2. When the angle between the longitudinal direction of the crossbeam support mechanism 4 and the longitudinal direction of the crossbeam 5 decreases, the inclination of the crossbeam support mechanism 4 increases, reducing the external force it can withstand and consequently reducing the tension of the projection screen. Conversely, when the angle between the crossbeam support mechanism 4 and the crossbeam 5 increases, the lifting device can withstand more external force, increasing the tension of the projection screen. This adapts to the tension requirements of screens of varying sizes and weights.

[0058] like Figure 5 As shown, in the second and third embodiments, when the crossbeam support mechanism 4 is a telescopic rod with variable length, it includes a housing 404, a telescopic rod 402, a screw 407, a nut 406, and a second motor 405. The telescopic rod 402 is disposed within the housing 404, the screw 407 is disposed within the telescopic rod 402 and is connected to the output end of the second motor 405, and the nut 406 is sleeved on the screw 407 and engages with the thread of the screw 407, thereby driving the telescopic rod 402 to extend and retract relative to the housing 404 as the screw 407 rotates. The housing 404 is used to support the components of the crossbeam support mechanism 4. When the second motor 405 drives the screw 407 to rotate, the telescopic rod 402, which is connected to the screw 407 via the nut 406, also rotates, thereby extending and retracting within the housing 404 to change its overall length.

[0059] In addition, the crossbeam support mechanism 4 also includes a stopper 403, a clutch 408, a gear set 409, and a first hinge 401 and a second hinge 410, respectively, located at each end of the telescopic rod 402. At least two stoppers 403 are provided to limit the position of the telescopic rod 402. The gear set 409 contacts the output shaft of the second motor 405, which drives the gear set 409. The gear set 409 is connected to the clutch 408. The other end of the clutch 408 is a screw 407, which further drives the screw 407 to rotate. The screw 407 drives the telescopic rod 402 to extend and retract, thus completing the transmission of the telescopic rod structure 4. The first hinge 401 is hinged to the crossbeam 5, and the second hinge 410 is hinged to the slider 203.

[0060] In addition, the screw slider mechanism 2 in the first and second embodiments can also be replaced by a telescopic rod, and the telescopic rod can also be used as Figure 5 The crossbeam support mechanism 4 is fixedly connected to the screw slider mechanism 2. The crossbeam support mechanism 4 drives the crossbeam 5 to move up and down following the extension and contraction of the screw slider mechanism 2. Compared with the method of using a slider and a screw, the telescopic rod needs to occupy a larger space.

[0061] In the embodiment of the present application, the angle change between the beam support mechanism 4 and the beam 5 and the screw slider mechanism 2 can also make the lifting device have a larger longitudinal expansion ratio, such as Figure 6 As shown, Figure 6 This is a structural diagram when the beam 5 is at its lowest point. When the beam 5 is at its lowest point, the beam support mechanism 4 is tilted. At this time, the height of the beam 5 is less than the shortest length of the beam support mechanism 4, minimizing the overall height after contraction. Figure 7 As shown, Figure 7 This is a schematic diagram of the structure when the crossbeam 5 is at its highest point. At this time, the crossbeam support mechanism 4 is extended to its maximum length, and the angle between the length direction of the crossbeam support mechanism 4 and the length direction of the crossbeam 5 and the length direction of the screw slider mechanism 2 is also the largest. Figure 7 The height of the middle crossbeam 5 is Figure 6 The height ratio of the middle crossbeam 5 is much greater than the longitudinal telescopic ratio of the crossbeam support mechanism 4 which cannot change its angle. The above two height adjustment methods of the crossbeam 5 can maximize the adjustment range of the height of the crossbeam 5.

[0062] The crossbeam 5 of the lifting device in the embodiment of the present application is connected to one side edge of the projection screen. The crossbeam 5 and the projection screen are driven to rise and fall by the separate or simultaneous actions of the screw slider mechanism 2 and the crossbeam support mechanism 4 of the lifting device, thereby adjusting the height of the projection screen.

[0063] The lifting device in the embodiment of the present application further includes a control circuit, which is used to control the start and stop of the first motor 206 and the second motor 405.

[0064] The present invention also provides a projection screen comprising the aforementioned lifting device, a projection screen, and a rolling mechanism. The projection screen is connected at one end to the lifting device's crossbeam 5 and at the other end to the rolling mechanism. When the lifting device unfolds the screen, the rolling mechanism unwinds the projection screen; when the lifting device retracts the screen, the rolling mechanism rewinds the projection screen. The lifting device has been described in detail and will not be repeated here. Using the aforementioned lifting device allows the projection screen to have a large longitudinal expansion ratio, adapting to varying tension requirements.

[0065] The projection screen lifting device of the present invention can be used as a screen for laser TV. Figures 8 to 12 The present invention also provides a laser TV, which includes a lifting device A1, a projection screen A2, a shell A3, a laser TV host A7, and a laser TV host motion mechanism A4.

[0066] The crossbeam 5 at the top of the lifting device A1 is used to secure the projection screen A2, allowing the projection screen A2 to rise and fall with the crossbeam 5, thereby unfolding or retracting the laser TV screen. The outer shell A3 is used to accommodate the retracted lifting device A1 and the laser TV host motion structure A4, in which the laser TV host A7 is housed. The support frame 1 of the lifting device A1 is fixed to the bottom of the outer shell A3. The internal space of the outer shell A3 is sufficient to accommodate the folded lifting device A1. The upper portion of the outer shell A3 has an opening slightly larger than the top crossbeam 5, allowing the crossbeam 5 to be freely accommodated in the outer shell A3 or raised from the outer shell A3.

[0067] like Figure 10 and Figure 11 As shown, the lifting device in this embodiment is equipped with a screen reel A5. The opposing edges of the projection screen are connected to the crossbeam 5 and the screen reel A5, respectively. The screen reel A5 unwinds the projection screen A2 as the crossbeam 5 moves away from the screen reel, and rewinds the projection screen A2 as the crossbeam 5 approaches the screen reel. Elastic members A6, such as vortex springs or torsion springs, are also located at the ends of the screen reel A5. These elastic members apply a force to the projection screen during unwinding, maintaining tension and maintaining a flat surface.

[0068] like Figure 12As shown, the laser TV motion mechanism A4 is arranged at the front of the housing A3, and its shape is similar to a drawer. The laser TV host A7 is stored on the internal flat panel of the laser TV host motion mechanism A4. The bottom of the laser TV host motion mechanism A4 has a guide rail and a screw rod, which can be automatically opened or closed by a motor, driving the laser TV to extend from the housing A3 or be accommodated in the housing A3. Since the size and projection ratio of laser TVs from different manufacturers vary to a certain extent, the relative height and relative distance between the laser TV and the screen must be adjustable. Among them, the relative distance between the two can be adjusted by the opening distance of the laser TV motion mechanism A4 and the placement of the laser TV, and the relative height can be adjusted by the lifting device A1, so that the installation structure of the laser TV of the present invention can adapt to the vast majority of laser TV products on the market.

[0069] The projection screen lifting device, projection screen and laser TV of the present invention are characterized in that the lifting device can adjust the height through the separate or simultaneous actions of the screw slider and the beam support mechanism, and has a large adjustment range to meet the usage requirements of different screen heights. By adjusting the support angle of the lifting device, it can also adapt to different tension requirements.

[0070] The above are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A lifting device for a projection screen, characterized in that: include: A screw-slider mechanism, comprising a screw and a slider; a crossbeam support mechanism, one end of which is hingedly or fixedly connected to the corresponding slider to form a first hinge point or a first connection point; a crossbeam, the other end of the crossbeam support mechanism being hinged to the crossbeam to form a second hinge point; The slider is capable of moving along the length direction of the screw rod, thereby adjusting the linear distance between the first hinge point or the first connection point and the crossbeam; The number of the screw slider mechanism and the beam support mechanism is two, and they are symmetrically distributed about the perpendicular midline of the beam; The crossbeam support mechanism is a telescopic mechanism or a support rod of fixed length; The angle between the length direction of the screw rod and the length direction of the beam is an acute angle, and is smaller than the angle between the length direction of the beam support mechanism and the length direction of the beam.

2. The projection screen lifting device according to claim 1, characterized in that: When the beam support mechanism is a retractable mechanism, the beam support mechanism can be retracted and retracted along the length direction of the beam support mechanism, thereby adjusting the distance between the first hinge point or the first connection point and the second hinge point.

3. The projection screen lifting device according to claim 1, characterized in that: The two screw slider mechanisms are configured to move synchronously, and the two beam support mechanisms are configured to move synchronously, so that the line connecting the two first hinge points or the two first connection points and the two second hinge points in sequence maintains an isosceles trapezoid; Among them, the line between the two first hinge points or the two first connection points forms the upper base of the isosceles trapezoid, the line between the two second hinge points forms the lower base of the isosceles trapezoid, and the line between the first hinge point or the first connection point and the second hinge point on the same side respectively forms the two waists of the isosceles trapezoid.

4. The projection screen lifting device according to claim 3, characterized in that: The lifting device further includes a synchronization mechanism, which is connected between the two beam support mechanisms and is used to keep the angle between the length directions of the two beam support mechanisms and the beams consistent during the synchronization process of the two screw slider mechanisms and / or the synchronization process of the two beam support mechanisms.

5. The projection screen lifting device according to claim 4, characterized in that: The synchronization mechanism includes a column, a connecting rod and two sleeves; The column is provided with a first guide groove perpendicular to the beam, the connecting rod is configured to slide up and down along the first guide groove, and the two ends of the connecting rod are axially symmetrically arranged relative to the mid-vertical line, the two sleeves are respectively hinged to the two ends of the connecting rod, and are respectively sleeved on the corresponding beam support mechanism, so that the beam support mechanism can be extended and retracted along the length direction of the beam support mechanism under the constraint of the sleeve.

6. The projection screen lifting device according to claim 5, characterized in that: The synchronization mechanism further comprises a column guide rail, wherein the column guide rail is provided with a second guide groove extending parallel to the mid-perpendicular line, and the column is configured to slide along the second guide groove.

7. The projection screen lifting device according to claim 1, characterized in that: The screw slider mechanism further includes a base, a slider guide rail provided on the base, a coupling and a first motor; The screw rod is rotatably supported on the base; The slider is sleeved on the screw rod and matched with the screw rod thread, and the slider is further configured to slide along the slider guide rail; One end of the coupling is connected to the screw rod, and the other end is connected to the output shaft of the first motor.

8. The projection screen lifting device according to claim 1, wherein: When the beam support mechanism is a telescopic mechanism, the beam support mechanism includes a housing, a telescopic rod, a screw, a nut and a second motor; The telescopic rod is inserted into the outer shell, the screw is inserted into the telescopic rod and is connected to the output end of the second motor, the nut is sleeved on the screw and cooperates with the thread of the screw, and then drives the telescopic rod to extend and retract relative to the outer shell as the screw rotates.

9. A projection screen, characterized in that: The device comprises a lifting device, a projection screen and a rolling screen mechanism according to any one of claims 1 to 8; One end of the projection screen is connected to the crossbeam of the lifting device, and the other end is connected to the rolling screen mechanism; When the lifting device unfolds the screen, the rolling screen mechanism unwinds the projection screen, and when the lifting device retracts the screen, the rolling screen mechanism rewinds the projection screen.

10. A laser TV, characterized in that: It comprises a laser TV host, a lifting device according to any one of claims 1 to 8, a projection screen, a housing and a laser TV host motion structure; The laser TV host faces the projection screen and is arranged on the motion structure of the laser TV host, and moves along with the motion structure of the laser TV host; The lifting device drives the projection screen to open or retract.

11. The laser TV according to claim 10, characterized in that: The laser TV also includes a screen scroll, and the two opposite edges of the projection screen are respectively connected to the beam and the screen scroll. The screen scroll is used to unwind the projection screen when the beam moves away from the screen scroll, and to rewind the projection screen when the beam approaches the screen scroll.

Images