WO2022078114A1 - 一种投影屏幕的升降装置、投影屏幕及激光电视 - Google Patents

一种投影屏幕的升降装置、投影屏幕及激光电视 Download PDF

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Publication number
WO2022078114A1
WO2022078114A1 PCT/CN2021/117140 CN2021117140W WO2022078114A1 WO 2022078114 A1 WO2022078114 A1 WO 2022078114A1 CN 2021117140 W CN2021117140 W CN 2021117140W WO 2022078114 A1 WO2022078114 A1 WO 2022078114A1
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WO
WIPO (PCT)
Prior art keywords
projection screen
lifting device
screen
beam support
slider
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Application number
PCT/CN2021/117140
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English (en)
French (fr)
Inventor
赵振宇
唐泽达
李士杰
王霖
李屹
Original Assignee
深圳光峰科技股份有限公司
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Application filed by 深圳光峰科技股份有限公司 filed Critical 深圳光峰科技股份有限公司
Publication of WO2022078114A1 publication Critical patent/WO2022078114A1/zh

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]

Definitions

  • the present invention relates to the technical field of lifting devices, in particular to a lifting device for projection screens, projection screens and laser televisions.
  • Projection equipment generally needs to display images by projecting images on a projection screen, and the projection screen can be divided into a soft screen and a hard screen.
  • the soft screen is mainly supported by the screen frame.
  • the screen is tensioned and fixed on the frame by means of springs and Velcro.
  • the screen and frame parts are in a disassembled state during transportation. The installation is completed on site, and the cost is relatively low.
  • the hard screen uses a thin lightweight plate (usually honeycomb aluminum plate) as the backplane, the screen is attached to the surface of the backplane, and the outer side is decorated with a frame.
  • the hard screen is already installed at the factory, and the flatness and aesthetics It has a good effect on the above, but it also has the disadvantages of easy deformation, difficult transportation and high cost.
  • the fixed structure always has the following problems:
  • the structure After installation, the structure is basically unchanged. Whether viewing or not, it needs to occupy a certain wall space, and the screen surface is mostly dark, which affects the appearance, and the height and support angle cannot be adjusted at any time.
  • the installation position of the projection equipment or the screen needs to be adjusted repeatedly during the installation process. After the installation, the position of the screen is fixed and it is difficult to adjust the position again. However, if the projection device is not fixed, it is easy to be displaced in daily life. Therefore, the fixed screen is not very convenient for the daily use of the projection device.
  • the screen substrate is a flexible film with a thin thickness.
  • the fixed screen lacks the protection of the screen surface during daily use, which may cause scratches, scratches, creases, etc., which will damage the surface microstructure and paint film, thereby affecting the overall display effect.
  • the screen that can be raised and lowered either needs to be manually unfolded or rolled, which is not convenient enough, or requires a thicker support structure, which is not beautiful from the side or back.
  • 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 can adapt to different tension requirements by adjusting the supporting angle of the lifting device.
  • a technical solution adopted by the present invention is to provide a lifting device for a projection screen, which includes a screw slider mechanism, a beam support mechanism and a beam, and the screw slider mechanism includes a screw rod and a slider.
  • One end of the beam support mechanism is hinged or fixedly connected with the corresponding sliding block, thereby forming a first hinge point or a first connection point.
  • the other end of the beam support mechanism is hinged with the beam to form a second hinge point.
  • the sliding block can move along the length direction of the screw rod, so as to adjust the linear 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 distributed symmetrically on the vertical line of the beam respectively.
  • the beam support mechanism is a telescopic mechanism or a fixed-length support rod.
  • the beam support mechanism when the beam support mechanism is a telescopic mechanism, the beam support mechanism can expand and contract 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.
  • the angle between the length direction of the screw rod and 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.
  • the two screw-slider mechanisms are set to be able to act synchronously, and the two beam support mechanisms are set to be able to act synchronously, so that the two first hinge points or the two first connection points and the two second hinge points are arranged in the same order.
  • the secondary connection line is kept as 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, and the connection line between the two second hinge points forms the upper base of the isosceles trapezoid.
  • the lower base of the isosceles trapezoid, the first hinge point on the same side or the connecting line between the first connection point and the second hinge point respectively form two sides of the isosceles trapezoid.
  • the lifting device further includes a synchronizing mechanism, the synchronizing mechanism is connected between the two beam support mechanisms, and is used to make the two The length direction of the beam support mechanism is consistent with the angle between the beams.
  • the synchronization mechanism includes a column, a connecting rod and two sleeves.
  • the vertical column is provided with a first guide groove that is perpendicular to the beam
  • the connecting rod is set to slide up and down along the first guide groove
  • both ends of the connecting rod are axially symmetrical with respect to the vertical line
  • the two sleeves are hinged to the connecting rod respectively.
  • the two ends are respectively sleeved on the corresponding beam support mechanism, so that the beam support mechanism can expand and contract along the length direction of the beam support mechanism under the restraint of the casing.
  • the synchronization mechanism further includes a column guide rail, the column guide rail is provided with a second guide groove extending parallel to the vertical line, and the column is arranged to slide along the second guide groove.
  • the screw-slider mechanism also includes a base, a slider guide rail arranged on the base, a coupling and a first motor.
  • the screw is rotatably supported on the base.
  • the slider is sleeved on the screw rod and is threadedly matched with the screw rod, and the slider is further arranged to slide along the guide rail of the slider.
  • One end of the coupling is connected with the screw rod, and the other end is connected with the output shaft of the first motor.
  • the beam support mechanism when the beam support mechanism is a telescopic mechanism, the beam support mechanism includes a casing, a telescopic rod, a screw rod, a nut and a second motor.
  • the telescopic rod is penetrated in the casing, the screw rod is penetrated in the telescopic rod, and is connected with the output end of the second motor, the nut is sleeved on the screw rod, and cooperates with the thread of the screw rod, and then drives the telescopic rod relative to the rotation of the screw rod.
  • the shell is retractable.
  • the present invention also provides a projection screen, and the projection equipment includes the above-mentioned lifting device, a projection screen and a rolling screen mechanism;
  • One end of the projection screen is connected with the beam of the lifting device, and the other end is connected with the rolling screen mechanism; when the lifting device unfolds the screen, the rolling screen mechanism unwinds the projection screen, and when the lifting device shrinks the screen, the rolling screen mechanism rewinds the projection screen.
  • the present invention also provides a laser TV, the laser TV includes a laser TV host, the above-mentioned lifting device, a projection screen, a casing and a laser TV motion structure;
  • the laser TV host is facing the projection screen, and is set on the laser TV motion structure, and moves with the laser TV motion structure;
  • the lifting device drives the projection screen to open or roll up.
  • the laser TV also includes a screen scroll.
  • the opposite sides of the projection screen are connected to the beam and the screen scroll respectively.
  • the screen scroll is used to unwind the projection screen when the beam is away from the screen scroll, and when the beam is close to the screen scroll. Roll-up projection screen.
  • the lifting device can adjust the height through the independent or simultaneous action of the screw slider and the beam support mechanism, and the adjustment range is large to meet the use of different heights of the screen Demand, adjusting the support angle of the lifting device can also adapt to different tension requirements.
  • FIG. 1 is a schematic structural diagram of an embodiment of a lifting device for a projection screen of the present invention
  • Fig. 2 is the structural representation of the lead screw slider mechanism in Fig. 1;
  • Fig. 3 is the front structure schematic diagram of synchronizing mechanism in Fig. 1;
  • Fig. 4 is the perspective view of the synchronization mechanism in Fig. 1;
  • Figure 5 is a perspective view of the beam support mechanism in Figure 1;
  • Fig. 6 is the structural representation when the beam in Fig. 1 is located at the lowest point;
  • Fig. 7 is the structural representation when the beam in Fig. 1 is located at the highest point;
  • Fig. 8 is the structural representation of laser TV
  • Fig. 9 is the schematic diagram when the lifting device in Fig. 8 drives the projection screen to rise;
  • Figure 10 is an internal perspective view of a laser TV
  • Fig. 11 is the split structure schematic diagram of A part in Fig. 10;
  • FIG. 12 is an internal top view of the laser TV.
  • FIG. 1 is a schematic diagram of an embodiment of a lifting device for a projection screen of the present invention
  • FIG. 2 is a schematic structural diagram of a screw slider mechanism.
  • the lifting device includes a screw slider mechanism 2, a beam support mechanism 4, Beam 5.
  • the screw-slider mechanism 2 includes a screw rod 202 and a slider 203 .
  • One end of the beam support mechanism 4 is hinged with the slider 203 through the first hinge point 10 to form a first hinge point, or is fixedly connected with the slider 203 through the first connection point 10 to form a first connection point, and the other end is connected through the second hinge point.
  • 20 is hinged to the beam 5.
  • the beam support mechanism 4 can be a fixed rod with a constant length, or a telescopic rod with a variable length. Each of them will be described below.
  • the beam support mechanism 4 is a fixed rod with a constant length.
  • the slider 203 of the screw slider mechanism 2 can move along the length of the screw rod 202 to adjust the position of the first hinge point 10 on the screw rod 202, thereby driving the beam 5 to move up and down to unfold or roll up the screen.
  • the number of the screw slider mechanism 2 and the beam support mechanism 4 is two, and they are distributed symmetrically with the vertical line of the beam 5 as the center line, so that the force on both sides of the beam 5 is balanced and moves up and down smoothly .
  • the screw-slider mechanism 2 in this embodiment further includes a base 201 , a slider guide 204 , a coupling 205 and a first motor 206 arranged on the base 201 ; the slider guide 204 It is inclined at a preset angle, so that when the slider 203 slides thereon, the height of the beam support mechanism 4 connected with the slider 203 can be changed.
  • the screw rod 202 is rotatably supported on the base 201; the slider 203 is sleeved on the screw rod 202 and matched with the thread of the screw rod 202, and the slider 203 is further arranged to slide along the slider guide rail 204; one end of the coupling 205 It is connected with the lead screw 202 , and the other end is connected with the output shaft of the first motor 206 .
  • the first motor 206 When the first motor 206 is activated, it drives the coupling 205 and the screw rod 202 to rotate, so that the slider 203 moves along the length of the screw rod 202 .
  • the slider 203 drives the beam support mechanism 4 to link with each other, thereby changing the height of the beam 5, and the length direction of the beam support mechanism 4 and the length direction of the beam 5 and the sliding of the screw rod.
  • the screw rod 202 used in the present invention has self-locking ability, and the slider 203 cannot move without the action of external force, so the stability of the lifting device can be better ensured than the chute or other structures.
  • the two screw-slider mechanisms 2 are set to be able to act synchronously, and the two beam support mechanisms 4 are set to be able to act synchronously, so that the two first hinge points 10 and the two second hinge points 20 are synchronously arranged.
  • the secondary connection line is kept as an isosceles trapezoid; wherein, the connection line between the two first hinge points 10 forms the upper base of the isosceles trapezoid, and the connection line between the two second hinge points 20 forms the lower base of the isosceles trapezoid.
  • the connecting lines between the first hinge point 10 and the second hinge point 20 on the same side respectively form two sides of an isosceles trapezoid.
  • the two screw slider mechanisms 2 and the two beam support mechanisms 4 move synchronously, so that the horizontal beam 5 can be maintained, so that the screen arranged on the beam 5 will not be inclined.
  • the sequential connection of the four hinge points is always maintained as an isosceles trapezoid, and the stability of the lifting device can be maintained by using the relatively stable structural characteristics of the isosceles trapezoid, so that the top beam 5 can be smoothly lifted.
  • the included angle a between the length direction of the screw rod 202 and the length direction of the beam 5 in this embodiment is an acute angle, so that the beam support mechanism 4 can be changed with the beam when sliding on the screw slider mechanism 2.
  • the angle between the length direction, and the angle a between the length direction of the screw 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 supports
  • the mechanism 4 can be tilted as much as possible when retracted, thereby reducing the height projected by the beam support mechanism 4 in the vertical direction, that is, the overall height of the lifting device when retracted to the greatest extent, and the space required for storage is reduced.
  • the support frame 1 includes a first support frame 101 and a second support frame 102. One end of the first support frame 101 and the second support frame 102 is connected as The other end is fixed on the external structure, for example, in the projection equipment; the first bracket 101 is arranged perpendicular to the beam 5, the second bracket 102 is arranged obliquely with the beam 5, and the screw slider mechanism 2 is fixed on the second bracket 102 on.
  • the lifting device also includes a synchronizing mechanism 3, which is connected between the two beam support mechanisms 4 to ensure that the two beam support mechanisms 4 slide along the slider guide rails synchronously, so that the two first hinged
  • the connection line between the point 10 or the first connection point 10 and the two second hinge points 20 is always kept as an isosceles trapezoid to ensure the smooth up and down movement of the lifting device.
  • the synchronization mechanism 3 includes a column 301 , a connecting rod 302 , two sleeves 303 , and a column guide 304 .
  • the upright column 301 is provided with a first guide groove 305 perpendicular to the beam 5, the connecting rod 302 is set to slide up and down along the first guide groove 305, and the two ends of the connecting rod 302 are axially symmetrical with respect to the vertical line.
  • 303 are hinged to both ends of the connecting rod 302 respectively, and are respectively sleeved on the corresponding beam support mechanism 4, so that the beam support mechanism 4 can expand and contract along the length direction of the beam support mechanism 4 under the restraint of the sleeve 303.
  • the upright column 301 is arranged on the vertical line of the beam 5 and is used for installing the connecting rod 302 , and the connecting rod 302 can slide in the first guide groove 305 .
  • the connecting rod 302 When the beam 5 moves upward, the connecting rod 302 is driven to slide upward in the first guide groove 305 , and it is ensured that the connecting rod 302 is always under the restriction of the first guide groove 305 .
  • the hinge points of the connecting rod 302 and the casing 303 on both sides are always symmetrical, so as to ensure that the angle between the beam support mechanism 4 on both sides and the beam 5 in the length direction is always consistent, and the beam 5 is always kept in a horizontal state.
  • the first guide groove 305 restricts the movement direction of the connecting rod 302 to be the vertical direction, so as to prevent the inclination during the movement.
  • the column guide rail 304 is provided with a second guide groove 306 extending parallel to the vertical line.
  • the column 301 is arranged to slide along the second guide groove 306, so that the column 301 can slide in the direction perpendicular to the beam 5, and the height of the connecting rod 302 can be adjusted. , thereby changing the adjustable range of the beam support mechanism 4 .
  • 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 use requirements of different heights of the screen, and adjusting the supporting angle of the lifting device can also adapt to different tension requirements; set the synchronization mechanism 3 Ensure that the beam support mechanism 4 or the slider 203 on the left and right sides can act 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 a telescopic rod is used instead The space occupied is relatively large, the length of the screw 202 can be selected according to the movement range of the slider 203, and the retracted length of the telescopic rod is at least equal to the movement range of the slider. Compared with the screw slider mechanism 2 More space saving.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the beam support mechanism 4 is a telescopic rod with a variable length, and the beam support mechanism 4 is fixedly connected with the lead screw slider mechanism 2 .
  • the screw-slider mechanism 2 may be a fixed structure located on the same plane as the beam 5 and the beam support mechanism 4 .
  • a synchronization mechanism 3 is connected between the beam support mechanisms 4, 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.
  • the distance between the first connection point 10 and the second hinge point 20 can be adjusted when the beam support mechanism 4 is extended and retracted, thereby driving the beam 5 to move up and down to expand or contract the screen.
  • the beam support mechanism 4 is a telescopic rod with a variable length
  • the beam support mechanism 4 and the screw slider mechanism 2 are slidably connected through the slider 203 .
  • the slider 203 also moves under the driving of the screw rod 202, that is, the screw slider mechanism 2 and the beam support mechanism 4 move at the same time, and both of them simultaneously adjust the height of the beam 5. adjust.
  • the beam support mechanism 4 and the screw-slider mechanism 2 are slidably connected by the slider 203, but the slider 203 is not moved, the beam support mechanism 4 expands and contracts the length, and the height of the beam 5 is adjusted.
  • the length of the beam support mechanism can be kept unchanged first, and the slider is moved under the drive of the screw rod, and then the height of the beam can be adjusted, and then the slider can be kept stationary to adjust the length of the beam support mechanism. Adjust the height of the beam.
  • the lifting device adjusts the height of the beam 5 by sliding the beam support mechanism 4 on the screw slider mechanism 2 and the expansion and contraction of the beam support mechanism 4 itself.
  • the slider 203 is driven to move on the screw rod 202 , thereby changing the height projected by the beam support mechanism 4 in the vertical direction, that is, the height of the beam 5 .
  • the movement of the beam support mechanism 4 on the screw slider mechanism 2 and the expansion and contraction of the beam support mechanism 4 also change the angle between the beam support mechanism 4 and the beam 5 and the screw slider mechanism 2.
  • the length of the beam support mechanism 4 When the angle between the direction and the length direction of the beam 5 decreases, the inclination of the beam support mechanism 4 increases, the external force it can withstand decreases, and the tension of the projection screen decreases accordingly.
  • the lifting device can withstand the increase of external force, and the tension of the projection screen increases, so as to adapt to the tension requirements of screens of different sizes and weights.
  • the beam support mechanism 4 when the beam support mechanism 4 is a telescopic rod with variable length, it includes a casing 404 , a telescopic rod 402 , a screw 407 , a nut 406 and a second motor 405 ; the telescopic rod 402
  • the screw 407 is inserted into the outer casing 404, the screw rod 407 is inserted into the telescopic rod 402, and is connected with the output end of the second motor 405, and the nut 406 is sleeved on the screw rod 407, and cooperates with the thread of the screw rod 407, and then follows the screw rod 407.
  • the rotation drives the telescopic rod 402 to expand and contract relative to the casing 404 .
  • the casing 404 is used to carry the components of the beam support mechanism 4.
  • the second motor 405 drives the screw rod 407 to rotate
  • the telescopic rod 402 connected with the screw rod 407 through the nut 406 also rotates, and the entire length is telescopically changed in the casing 404.
  • the beam support mechanism 4 further includes a limiter 403 , a clutch 408 , a gear set 409 , and a first hinge 401 and a second hinge 410 respectively provided at both ends of the telescopic rod 402 .
  • a limiter 403 which limit the two ends of the telescopic rod 402 .
  • the gear set 409 is in contact with the output shaft of the second motor 405, the second motor 405 drives the gear set 409 to move, the gear set 409 is connected to the clutch 408, and the other end of the clutch 408 is the screw 407, which continues to drive the screw 407 to rotate, and the screw 407 drives the telescopic rod 402 is telescopic, thereby completing the transmission of the telescopic rod structure 4 .
  • the first hinge 401 is hinged with the beam 5
  • the second hinge 410 is hinged with the slider 203 .
  • 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 adopt the structure as shown in FIG. 5 .
  • the beam support mechanism 4 is fixedly connected with the screw slider mechanism 2, and the beam support mechanism 4 follows the expansion and contraction of the screw slider mechanism 2 to drive the beam 5 to move up and down. larger space.
  • 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.
  • the beam 5 is located at the lowest position
  • FIG. 7 is a schematic diagram of the structure when the beam 5 is at the highest point.
  • the beam support mechanism 4 is extended to the longest, and the length direction of the beam support mechanism 4 is the same as the length direction of the beam 5 and the screw slider mechanism.
  • the height adjustment method maximizes the adjustment range of the height of the beam 5.
  • the beam 5 of the lifting device in the embodiment of the present application is connected to one side edge of the projection screen, and the beam 5 and the projection screen are driven to rise and fall by the individual or simultaneous actions of the screw slider mechanism 2 and the beam support mechanism 4 of the lifting device. to adjust the height of the projection screen.
  • the lifting device in the embodiment of the present application further includes a control circuit, and the control circuit is used to control the starting and closing of the first motor 206 and the second motor 405 .
  • the present invention also provides a projection screen, which includes the above-mentioned lifting device, a projection screen, and a rolling screen mechanism.
  • One end of the projection screen is connected with the beam 5 of the lifting device, and the other end is connected with the rolling screen mechanism.
  • 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.
  • the lifting device has been described in detail, and will not be repeated here.
  • the use of the above-mentioned lifting device can make the projection screen have a larger longitudinal expansion ratio and adapt to different tension requirements.
  • the lifting device of the projection screen of the present invention can be used as a screen of a laser TV. 8 to 12, the present invention also provides a laser TV, the laser TV includes a lifting device A1, a projection screen A2, a casing A3, a laser TV host A7, and a laser TV host motion mechanism A4.
  • the beam 5 at the top of the lifting device A1 is used to fix the projection screen A2, so that the projection screen A2 can rise and fall with the beam 5, so as to unfold or store the screen of the laser TV.
  • the shell A3 is used to accommodate the retracted lifting device A1 and the laser TV host motion structure A4, and the laser TV host A7 is accommodated in the laser TV host motion mechanism A4.
  • the support frame 1 of the lifting device A1 is fixed to the bottom of the shell A3.
  • the inner space of the shell A3 is enough to accommodate the folded lifting device A1.
  • the upper part of the shell A3 has an opening, and the size of the opening is slightly larger than that of the top beam 5, so that the beam 5 can be freely accommodated in the shell. Inside A3 or rising out of housing A3.
  • the lifting device in this embodiment is provided with a screen scroll A5, and the opposite sides of the projection screen are connected to the beam 5 and the screen scroll A5 respectively, and the screen scroll A5 is used to keep the beam 5 away from each other. Unwind the projection screen A2 during the process of the screen rewinding shaft, and rewind the projection screen A2 when the beam 5 is close to the screen rewinding shaft.
  • the ends on both sides of the screen scroll A5 are also provided with elastic members A6, such as a vortex spring or a torsion spring, which exerts elastic force on the screen when the projection screen is unrolled, so that the projection screen always has a tension force and is kept in a flat state.
  • the laser TV movement mechanism A4 is arranged at the front of the casing A3, and its shape is similar to a drawer.
  • the laser TV host A7 is stored on the inner flat plate of the laser TV host movement mechanism A4.
  • the bottom of the laser TV host movement mechanism A4 has The guide rail and the screw rod can be automatically unfolded or closed by the motor drive, and the laser TV can be driven to extend from the shell A3 or be accommodated in the shell A3. Due to the differences in the size and projection ratio of laser TVs from different manufacturers, the relative height and relative distance between the laser TV and the screen should be able to be adjusted.
  • the relative distance between the two can be adjusted by the opening distance of the laser TV moving mechanism A4 and the placement position 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 be adapted to the market. the vast majority of laser TV products.
  • the lifting device of the projection screen, the projection screen and the laser TV of the present invention can adjust the height through the independent 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 heights of the screen.
  • the supporting angle of the lifting device can also be adapted to different tension requirements.

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  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)

Abstract

本发明公开了一种投影屏幕的升降装置、投影屏幕及激光电视，升降装置包括丝杆滑块机构、横梁支撑机构以及横梁。丝杆滑块机构包括丝杆和滑块。横梁支撑机构的一端与对应的滑块铰接或固定连接，进而形成第一铰接点或第一连接点。横梁支撑机构的另一端与横梁铰接，进而形成第二铰接点。滑块能够沿丝杆的长度方向移动，进而调节第一铰接点或第一连接点与横梁之间的直线距离。丝杆滑块机构和横梁支撑机构的数量均为两个，且分别以横梁的中垂线对称分布。本发明的升降装置可通过丝杆滑块和横梁支撑机构的单独或同时动作来调节高度，调节范围大，以满足屏幕不同高度的使用需求。调节升降装置的支撑角度还可以适应不同张力需求。

Description

一种投影屏幕的升降装置、投影屏幕及激光电视 技术领域
本发明涉及升降装置技术领域，特别是涉及一种投影屏幕的升降装置、投影屏幕及激光电视。
背景技术
投影设备一般需要通过将图像投影到投影屏幕上来进行显示，投影屏幕可分为软屏和硬屏。软屏主要靠屏幕框架进行支撑，屏幕通过弹簧、魔术贴等方式张紧并固定于框架上，屏幕及框架零件在运输过程中处于拆分状态，在现场完成安装，成本相对较低。而硬屏采用厚度较薄的轻质板材(通常为蜂窝铝板)作为背板，将屏幕贴合于背板表面，外侧装饰有边框，硬屏在出厂时即已经装好，平整度及美观度上均有不错的效果，但也存在容易变形，不易运输，成本较高的缺点。然而，不论软屏还是硬屏，固定式的结构始终存在以下几点问题：
1.安装完毕后结构基本不变，不论是否观看均需要占用一定的墙面空间，且幕面多为深色，影响美观，且无法随时调节高度和支撑角度。
2.由于要与投影设备进行配合，安装过程中需要反复调整投影设备或屏幕的安装位置，安装后屏幕位置即已固定，难以再次调整位置。而投影设备如不固定的话在日常中很容易发生位移，因此，固定式的屏幕对投影设备的日常使用来说还不是十分便利。
3.屏幕基材为柔性薄膜，且厚度较薄。固定式屏幕在日常使用过程中缺乏对幕面的保护，可能会产生划伤、刮蹭、折痕等情况，会破坏表面微结构及漆膜，从而影响整体的显示效果。
4.可升降的屏幕或者需要人工展开或收卷，不够方便，或者需要较厚的支撑结构，从侧面或背面看不够美观。
发明内容
本发明主要解决的技术问题是:提供一种投影屏幕的升降装置、投影屏幕及激光电视，能够对投影屏幕进行高度调节，同时通过调节升降装置的支撑角度，可以适应不同张力需求。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种投影屏幕的升降装置，包括丝杆滑块机构、横梁支撑机构以及横梁，丝杆滑块机构包括丝杆和滑块。横梁支撑机构的一端与对应的滑块铰接或固定连接，进而形成第一铰接点或第一连接点。横梁支撑机构的另一端与横梁铰接，进而形成第二铰接点。滑块能够沿丝杆的长度方向移动，进而调节第一铰接点或第一连接点与横梁之间的直线距离。丝杆滑块机构和横梁支撑机构的数量均为两个，且分别以横梁的中垂线对称分布。
其中，横梁支撑机构为可伸缩机构或固定长度的支撑杆。
其中，当横梁支撑机构为可伸缩机构时，横梁支撑机构能够沿横梁支撑机构的长度方向伸缩，进而调节第一铰接点或第一连接点和第二铰接点之间的距离。
其中，丝杆的长度方向与横梁之间的夹角为锐角，且小于横梁支撑机构的长度方向与横梁长度方向之间的夹角。
其中，两个丝杆滑块机构设置成能够同步动作，两个横梁支撑机构设置成能够同步动作，进而使得两个第一铰接点或两个第一连接点和两个第二铰接点的顺次连线保持为等腰梯形；进一步的，两个第一铰接点或两个第一连接点之间的连线形成等腰梯形的上底，两个第二铰接点之间的连线形成等腰梯形的下底，同侧的第一铰接点或第一连接点和第二铰接点之间的连线分别形成等腰梯形的两个腰。
其中，升降装置进一步包括同步机构，同步机构连接于两个横梁支撑机构之间，并用于在两个丝杆滑块机构的同步动作过程和/或两个横梁支撑机构的同步动作过程使得两个横梁支撑机构的长度方向与横梁之间的夹角保持一致。
其中，同步机构包括立柱、连接杆及两个套管。立柱设置有垂直于横梁的第一导向槽，连接杆设置成沿第一导向槽上下滑动，且连接杆的 两端相对于中垂线呈轴对称设置，两个套管分别铰接于连接杆的两端，并分别套设于对应的横梁支撑机构上，以使得横梁支撑机构沿横梁支撑机构的长度方向在套管的束缚下伸缩。
其中，同步机构还包括立柱导轨，立柱导轨设置有平行于中垂线延伸的第二导向槽，立柱设置成沿第二导向槽滑动。
其中，丝杆滑块机构还包括底座、设于底座上的滑块导轨、联轴器及第一电机。丝杆转动支撑于底座上。滑块套设于丝杆上，并与丝杆螺纹配合，滑块进一步设置成沿滑块导轨滑动。联轴器的一端与丝杆相连，另一端连接第一电机的输出轴。
其中，当横梁支撑机构为可伸缩机构时，横梁支撑机构包括外壳、伸缩杆、螺杆、螺母以及第二电机。伸缩杆穿设于外壳内，螺杆穿设于伸缩杆内，并与第二电机的输出端连接，螺母套设于螺杆上，并与螺杆的螺纹配合，进而随螺杆的转动带动伸缩杆相对于外壳进行伸缩。
为解决技术问题，本发明还提供一种投影屏幕，投影设备包括上述的升降装置、投影幕布以及卷幕机构；
投影幕布一端与升降装置的横梁连接，另一端与卷幕机构连接；当升降装置展开屏幕时，卷幕机构放卷投影幕布，当升降装置收缩屏幕时，卷幕机构收卷投影幕布。
为解决技术问题，本发明还提供一种激光电视，激光电视包括激光电视主机、上述的升降装置、投影幕布、外壳和激光电视运动结构；
激光电视主机正对投影幕布，且设于激光电视运动结构上，随激光电视运动结构运动；
升降装置带动投影幕布打开或收卷。
其中，激光电视还包括屏幕卷轴，投影屏幕彼此相对的两侧边缘分别与横梁和屏幕卷轴连接，屏幕卷轴用于在横梁远离屏幕卷轴的过程中放卷投影幕布，并在横梁接近屏幕卷轴的过程中收卷投影幕布。
本发明的投影屏幕的升降装置、投影屏幕及激光电视的有益效果：升降装置可通过丝杆滑块和横梁支撑机构的单独或同时动作来调节高度，调节范围大，以满足屏幕不同高度的使用需求，调节升降装置的支 撑角度还可以适应不同张力需求。
附图说明
为更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明投影屏幕的升降装置的一实施例的结构示意图；
图2是图1中丝杆滑块机构的结构示意图；
图3是图1中同步机构的正面结构示意图；
图4是图1中同步机构的立体图；
图5是图1中横梁支撑机构的透视图；
图6是图1中的横梁位于最低点时的结构示意图；
图7是图1中的横梁位于最高点时的结构示意图；
图8是激光电视的结构示意图；
图9是图8中的升降装置带动投影幕布升起时的示意图；
图10是激光电视的内部透视图；
图11是图10中A部的拆分结构示意图；
图12是激光电视的内部俯视图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
请参阅图1和图2，图1是本发明投影屏幕的升降装置实施例的示意图，图2为丝杆滑块机构的结构示意图，升降装置包括丝杆滑块机构2、横梁支撑机构4、横梁5。丝杆滑块机构2包括丝杆202和滑块203。 横梁支撑机构4的一端通过第一铰接点10与滑块203铰接形成第一铰接点，或通过第一连接点10与滑块203固定连接形成第一连接点，其另一端通过第二铰接点20与横梁5铰接。横梁支撑机构4可以为一长度不变的固定杆，也可以为一长度可变的伸缩杆。以下分别进行说明。
实施例一：
本实施例中，横梁支撑机构4为一长度不变的固定杆。丝杆滑块机构2的滑块203能够沿丝杆202的长度方向移动，调节第一铰接点10在丝杆202上的位置，从而带动横梁5上下运动，以展开或卷起屏幕。本实施例中，丝杆滑块机构2和横梁支撑机构4的数量均为两个，且分别以横梁5的中垂线为中心线对称分布，以使得横梁5两侧受力均衡平稳上下运动。
具体地，如图2所示，本实施例中的丝杆滑块机构2还包括底座201、设于底座201上的滑块导轨204、联轴器205及第一电机206；滑块导轨204以预设角度倾斜设置，从而可使得滑块203在其上滑动时可改变与滑块203连接的横梁支撑机构4的高度。
丝杆202转动支撑于底座201上；滑块203套设于丝杆202上，并与丝杆202的螺纹相配合，滑块203进一步设置成沿滑块导轨204滑动；联轴器205的一端与丝杆202相连，另一端连接第一电机206的输出轴。第一电机206启动时，带动联轴器205和丝杆202转动，使滑块203沿丝杆202长度方向运动，滑块203的下端与滑块导轨204接触，沿滑块导轨204滑动。由于横梁支撑机构4的一端与滑块203铰接，因此滑块203运动时带动横梁支撑机构4联动，从而改变横梁5的高度，以及横梁支撑机构4的长度方向与横梁5长度方向和丝杆滑块机构2长度方向之间的角度。
进一步的，本发明使用的丝杆202具有自锁能力，在没有外力作用下滑块203无法运动，因此相比滑槽或其它结构更能保障升降装置的稳定性。本实施例中的两个丝杆滑块机构2设置成能够同步动作，两个横梁支撑机构4设置成能够同步动作，进而使得两个第一铰接点10和两个第二铰接点20的顺次连线保持为等腰梯形；其中，两个第一铰接点 10之间的连线形成等腰梯形的上底，两个第二铰接点20之间的连线形成等腰梯形的下底，同侧的第一铰接点10和第二铰接点20之间的连线分别形成等腰梯形的两个腰。两个丝杆滑块机构2和两个横梁支撑机构4同步运动，可以保持横梁5的水平，使设于横梁5上的屏幕不会倾斜。将四个铰接点的依次连线始终保持为等腰梯形，利用等腰梯形较稳定的结构特性，可以保持升降装置的稳定性，从而使顶部的横梁5可以平稳的升降。
仍参阅图1，本实施例中的丝杆202的长度方向与横梁5的长度方向之间的夹角a为锐角，使横梁支撑机构4在丝杆滑块机构2上滑动时可以改变与横梁5长度方向之间的角度，且丝杆202的长度方向与横梁5长度方向之间的夹角a小于横梁支撑机构4的长度方向与横梁5长度方向之间的夹角b，以便使横梁支撑机构4在收缩时可以尽可能的倾斜，从而降低横梁支撑机构4在竖直方向投影的高度，也即最大程度降低升降装置收缩时的整体高度，减少存放所需的空间。
为对丝杆滑块机构2进行固定，本实施例中还设置了支撑架1，支撑架1包括第一支架101和第二支架102，第一支架101和第二支架102的其中一端连接为一体，另一端均固定于外部结构上，例如固定在投影设备内；第一支架101垂直于横梁5设置，第二支架102与横梁5呈倾斜设置，丝杆滑块机构2固定于第二支架102上。
另外，在本实施例中升降装置还包括同步机构3，同步机构3连接于两个横梁支撑机构4之间，可保证两个横梁支撑机构4同步沿滑块导轨滑动，这样两个第一铰接点10或第一连接点10和两个第二铰接点20的连线始终保持为等腰梯形，保证升降装置平稳的上下运动。
如图3和图4所示，同步机构3包括立柱301、连接杆302及两个套管303、立柱导轨304。
立柱301设置有垂直于横梁5的第一导向槽305，连接杆302设置成沿第一导向槽305上下滑动，且连接杆302的两端相对于中垂线呈轴对称设置，两个套管303分别铰接于连接杆302的两端，并分别套设于对应的横梁支撑机构4上，以使得横梁支撑机构4沿横梁支撑机构4的 长度方向在套管303的束缚下伸缩。立柱301设置于横梁5的中垂线上，用于安装连接杆302，连接杆302可在第一导向槽305内滑动。当横梁5向上运动时，带动连接杆302也随之在第一导向槽305内向上滑动，且保证连接杆302始终处于第一导向槽305的限制下。整个运动过程中连接杆302与两侧套管303的铰接点始终对称，从而保证两侧的横梁支撑机构4与横梁5长度方向上的夹角始终保持一致，横梁5始终保持水平状态。同时第一导向槽305限制连接杆302的运动方向为竖直方向，防止运动过程中的倾斜。
立柱导轨304设置有平行于中垂线延伸的第二导向槽306，立柱301设置成沿第二导向槽306滑动，使立柱301可以在垂直于横梁5的方向上滑动，调节连接杆302的高度，进而改变横梁支撑机构4的可调节范围。
本实施例中投影屏幕的升降装置可通过丝杆滑块的动作来调节横梁5的高度，以满足屏幕不同高度的使用需求，调节升降装置的支撑角度还可以适应不同张力需求；设置同步机构3保证左右两侧的横梁支撑机构4或滑块203能够同步动作，使升降装置始终保持等腰梯形的形状，结构稳定：丝杆滑块机构2也可以使用伸缩杆进行代替，但使用伸缩杆代替时占用的空间相对较大，丝杆202可根据滑块203的运动范围选定长度，而伸缩杆收缩后的长度至少与滑块的运动范围相当，两者相较选用丝杆滑块机构2更节省空间。
实施例二：
本实施例中，横梁支撑机构4为一长度可变的伸缩杆，横梁支撑机构4与丝杆滑块机构2固定连接。丝杆滑块机构2为与横梁5及横梁支撑机构4位于同一平面的固定结构即可。
横梁支撑机构4之间连接有同步机构3，同步机构3的结构与实施例一中的同步机构3结构相同，可保证两个横梁支撑机构4同步伸缩。
横梁支撑机构4伸缩时可调节第一连接点10和第二铰接点20之间的距离，从而带动横梁5上下运动展开或收缩屏幕。
实施例三：
本实施例中，横梁支撑机构4为一长度可变的伸缩杆，横梁支撑机构4与丝杆滑块机构2通过滑块203滑动连接。当横梁支撑机构4进行伸缩长度发生变化时，滑块203也在丝杆202的带动下进行运动，即丝杆滑块机构2和横梁支撑机构4同时运动，两者同时对横梁5的高度进行调节。另外，在其他变形方式中，横梁支撑机构4与丝杆滑块机构2通过滑块203滑动连接，但是使得滑块203不动，横梁支撑机构4进行伸缩长度，对横梁5的高度进行调节。在实际使用过程中，先可以使横梁支撑机构的长度不变，滑块在丝杆的带动下进行运动，进而对横梁的高度进行调节，然后保持滑块不动，调节横梁支撑机构的长度，对横梁的高度进行调节。在本实施例中，升降装置调节横梁5高度的方式为横梁支撑机构4在丝杆滑块机构2上滑动和横梁支撑机构4自身的伸缩，横梁支撑机构4通过丝杆滑块机构2上的滑块203带动在丝杆202上运动，从而改变横梁支撑机构4在竖直方向投影的高度，也即横梁5的高度。同时横梁支撑机构4在丝杆滑块机构2上运动和横梁支撑机构4自身的伸缩也改变了横梁支撑机构4与横梁5和丝杆滑块机构2间的角度，当横梁支撑机构4的长度方向与横梁5的长度方向之间的夹角减小时，横梁支撑机构4的倾斜程度增大，可承受外力减小，投影屏幕的张力随之减小，相反的，当横梁支撑机构4与横梁5的角度增大时，升降装置可承受外力增大，投影屏幕的张力变大，以此适应不同尺寸、重量的屏幕的张力需求。
如图5所示，在实施例二、三中横梁支撑机构4为一长度可变的伸缩杆时，其包括外壳404、伸缩杆402、螺杆407、螺母406以及第二电机405；伸缩杆402穿设于外壳404内，螺杆407穿设于伸缩杆402内，并与第二电机405的输出端连接，螺母406套设于螺杆407上，并与螺杆407的螺纹配合，进而随螺杆407的转动带动伸缩杆402相对于外壳404进行伸缩。外壳404用于承载横梁支撑机构4的零部件，第二电机405带动螺杆407转动时，与螺杆407之间通过螺母406连接的伸缩杆402也随之转动，在外壳404内伸缩改变整体长度。
此外，横梁支撑机构4还包括限位器403、离合器408、齿轮组409 以及分别设于伸缩杆402两端的第一铰链401和第二铰链410。限位器403的数量至少设置两个，对伸缩杆402的两端进行限位。齿轮组409与第二电机405的输出轴接触，第二电机405带动齿轮组409运动，齿轮组409连接离合器408，离合器408的另一端为螺杆407，继续带动螺杆407转动，螺杆407带动伸缩杆402进行伸缩，从而完成伸缩杆结构4的传动。第一铰链401与横梁5铰接，第二铰链410与滑块203铰接。
另外，实施例一、二中的丝杆滑块机构2也可以用伸缩杆代替，伸缩杆也可采用如图5中的结构。横梁支撑机构4与丝杆滑块机构2固定连接，横梁支撑机构4跟随丝杆滑块机构2的伸缩带动横梁5上下运动，与采用滑块与丝杆配合的方式相比，伸缩杆需要占用较大空间。
本申请实施例中，横梁支撑机构4与横梁5和丝杆滑块机构2间的角度变化还可以使升降装置具有较大的纵向伸缩比例，如图6所示，图6为横梁5位于最低点时的结构示意图，横梁5位于最低点时横梁支撑机构4倾斜放置，此时横梁5的高度小于横梁支撑机构4的最短长度，尽可能降低收缩后的整体高度。如图7所示，图7为横梁5位于最高点时的结构示意图，此时横梁支撑机构4伸长到最长，横梁支撑机构4的长度方向与横梁5的长度方向和丝杆滑块机构2的长度方向间的夹角角度也为最大，图7中横梁5的高度与图6中横梁5的高度比远大于不能进行角度变化的横梁支撑机构4的纵向伸缩比例，通过上述两种横梁5高度的调节方式最大限度的扩大横梁5高度的调节范围。
本申请实施例中的升降装置的横梁5与投影屏幕的一侧边缘连接，通过升降装置的丝杆滑块机构2和横梁支撑机构4的单独或同时动作来带动横梁5及投影屏幕上升和下降，从而调节投影屏幕的高度。
本申请实施例中的升降装置还包括控制电路，控制电路用于控制第一电机206和第二电机405的启动和关闭。
另外，本发明还提供一种投影屏幕，投影屏幕包括上述的升降装置、投影幕布、卷幕机构。投影幕布一端与升降装置的横梁5连接，另一端与卷幕机构连接。升降装置展开屏幕时，卷幕机构放卷投影幕布，升降 装置收缩屏幕时，卷幕机构收卷投影幕布。升降装置已详细描述过，在此不再赘述。使用上述的升降装置可以使投影屏幕具有较大的纵向伸缩比例，适应不同张力需求。
本发明的投影屏幕的升降装置可以用作激光电视的屏幕。请参考图8至图12，本发明还提供一种激光电视，激光电视包括升降装置A1、投影幕布A2、外壳A3、激光电视主机A7、激光电视主机运动机构A4。
升降装置A1顶部的横梁5用于与投影幕布A2进行固定，使投影幕布A2可以随横梁5上升和下降，从而展开或收纳激光电视的屏幕。外壳A3用于容纳收缩后的升降装置A1和激光电视主机运动结构A4，激光电视主机A7收纳于该激光电视主机运动机构A4中。升降装置A1的支撑架1与外壳A3的底部固定，外壳A3的内部空间足够收纳折叠后的升降装置A1，外壳A3上部有开口，开口尺寸略大于顶部横梁5，使横梁5可以自由收容于外壳A3内或从外壳A3内升出。
如图10和图11所示，本实施例中的升降装置内设有屏幕卷轴A5，投影屏幕彼此相对的两侧边缘分别与横梁5和屏幕卷轴A5连接，屏幕卷轴A5用于在横梁5远离屏幕收卷轴的过程中放卷投影幕布A2，并在横梁5接近屏幕收卷轴的过程中收卷投影幕布A2。屏幕卷轴A5两侧的端部还设有弹性件A6，如涡簧或扭簧，在投影屏幕放卷时对屏幕施加弹力，使投影屏幕始终具有张紧力，保持为平面状态。
如图12所示，激光电视运动机构A4设置于外壳A3的前部，其形状类似抽屉，激光电视主机A7收纳于激光电视主机运动机构A4的内部平板上，激光电视主机运动机构A4的底部有导轨及丝杆，由电机驱动可自动展开或关闭，带动激光电视从外壳A3内伸出或容纳于外壳A3内。由于不同厂家激光电视尺寸及投射比有一定差异，因此激光电视与屏幕之间的相对高度及相对距离要能够调整。其中，二者的相对距离可通过激光电视运动机构A4的打开距离和激光电视的摆放位置调整，而相对高度可由升降装置A1调整，由此使本发明的激光电视的安装结构能够适应市面上的绝大多数的激光电视产品。
本发明的投影屏幕的升降装置、投影屏幕及激光电视，升降装置可 通过丝杆滑块和横梁支撑机构的单独或同时动作来调节高度，调节范围大，以满足屏幕不同高度的使用需求，调节升降装置的支撑角度，还可以适应不同张力需求。
以上仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (13)

  1. 一种投影屏幕的升降装置，其特征在于，包括：
    丝杆滑块机构，包括丝杆和滑块；
    横梁支撑机构，所述横梁支撑机构的一端与对应的所述滑块铰接或固定连接，进而形成第一铰接点或第一连接点；
    横梁，所述横梁支撑机构的另一端与所述横梁铰接，进而形成第二铰接点；
    其中，所述滑块能够沿所述丝杆的长度方向移动，进而调节所述第一铰接点或第一连接点与所述横梁之间的直线距离；
    所述丝杆滑块机构和所述横梁支撑机构的数量均为两个，且分别以所述横梁的中垂线对称分布。
  2. 根据权利要求1所述的投影屏幕的升降装置，其特征在于，所述横梁支撑机构为可伸缩机构或固定长度的支撑杆。
  3. 根据权利要求2所述的投影屏幕的升降装置，其特征在于，当所述横梁支撑机构为可伸缩机构时，所述横梁支撑机构能够沿所述横梁支撑机构的长度方向伸缩，进而调节所述第一铰接点或第一连接点和所述第二铰接点之间的距离。
  4. 根据权利要求1所述的投影屏幕的升降装置，其特征在于，所述丝杆的长度方向与所述横梁的长度方向之间的夹角为锐角，且小于所述横梁支撑机构的长度方向与所述横梁长度方向之间的夹角。
  5. 根据权利要求1所述的投影屏幕的升降装置，其特征在于，两个所述丝杆滑块机构设置成能够同步动作，两个所述横梁支撑机构设置成能够同步动作，进而使得所述两个第一铰接点或两个第一连接点和所述两个第二铰接点的顺次连线保持为等腰梯形；
    其中，所述两个第一铰接点或两个第一连接点之间的连线形成所述等腰梯形的上底，所述两个第二铰接点之间的连线形成所述等腰梯形的下底，同侧的所述第一铰接点或第一连接点和所述第二铰接点之间的连线分别形成所述等腰梯形的两个腰。
  6. 根据权利要求5所述的投影屏幕的升降装置，其特征在于，所述升降装置进一步包括同步机构，所述同步机构连接于两个所述横梁支撑机构之间，并用于在两个所述丝杆滑块机构的同步动作过程和/或两个所述横梁支撑机构的同步动作过程使得两个所述横梁支撑机构的长度方向与所述横梁之间的夹角保持一致。
  7. 根据权利要求6所述的投影屏幕的升降装置，其特征在于，所述同步机构包括立柱、连接杆及两个套管；
    所述立柱设置有垂直于所述横梁的第一导向槽，所述连接杆设置成沿所述第一导向槽上下滑动，且所述连接杆的两端相对于所述中垂线呈轴对称设置，所述两个套管分别铰接于所述连接杆的两端，并分别套设于对应的所述横梁支撑机构上，以使得所述横梁支撑机构沿所述横梁支撑机构的长度方向在所述套管的束缚下伸缩。
  8. 根据权利要求7所述的投影屏幕的升降装置，其特征在于，所述同步机构还包括立柱导轨，所述立柱导轨设置有平行于所述中垂线延伸的第二导向槽，所述立柱设置成沿所述第二导向槽滑动。
  9. 根据权利要求1所述的投影屏幕的升降装置，其特征在于，所述丝杆滑块机构还包括底座、设于所述底座上的滑块导轨、联轴器及第一电机；
    所述丝杆转动支撑于所述底座上；
    所述滑块套设于所述丝杆上，并与所述丝杆螺纹配合，所述滑块进一步设置成沿所述滑块导轨滑动；
    所述联轴器的一端与所述丝杆相连，另一端连接所述第一电机的输出轴。
  10. 根据权利要求2所述的投影屏幕的升降装置，其特征在于，当所述横梁支撑机构为可伸缩机构时，所述横梁支撑机构包括外壳、伸缩杆、螺杆、螺母以及第二电机；
    所述伸缩杆穿设于所述外壳内，所述螺杆穿设于所述伸缩杆内，并与所述第二电机的输出端连接，所述螺母套设于所述螺杆上，并与所述螺杆的螺纹配合，进而随所述螺杆的转动带动所述伸缩杆相对于所述外 壳进行伸缩。
  11. 一种投影屏幕，其特征在于，包括如权利要求1-10任一项所述的升降装置、投影幕布以及卷幕机构；
    所述投影幕布一端与所述升降装置的横梁连接，另一端与所述卷幕机构连接；
    当所述升降装置展开所述屏幕时，所述卷幕机构放卷所述投影幕布，当所述升降装置收缩所述屏幕时，所述卷幕机构收卷所述投影幕布。
  12. 一种激光电视，其特征在于，包括激光电视主机、如权利要求1-10任一项所述的升降装置、投影幕布、外壳和激光电视主机运动结构；
    所述激光电视主机正对所述投影幕布，且设于所述激光电视主机运动结构上，随所述激光电视主机运动结构运动；
    所述升降装置带动所述投影幕布打开或收卷。
  13. 根据权利要求12所述的激光电视，其特征在于，所述激光电视还包括屏幕卷轴，所述投影屏幕彼此相对的两侧边缘分别与所述横梁和所述屏幕卷轴连接，所述屏幕卷轴用于在所述横梁远离所述屏幕卷轴的过程中放卷所述投影幕布，并在所述横梁接近所述屏幕卷轴的过程中收卷所述投影幕布。
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