WO2023011052A1 - 投影装置和投影屏幕 - Google Patents

投影装置和投影屏幕 Download PDF

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Publication number
WO2023011052A1
WO2023011052A1 PCT/CN2022/101952 CN2022101952W WO2023011052A1 WO 2023011052 A1 WO2023011052 A1 WO 2023011052A1 CN 2022101952 W CN2022101952 W CN 2022101952W WO 2023011052 A1 WO2023011052 A1 WO 2023011052A1
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WO
WIPO (PCT)
Prior art keywords
screen
smoothing
curtain
smoothing mechanism
projection device
Prior art date
Application number
PCT/CN2022/101952
Other languages
English (en)
French (fr)
Inventor
陈友才
杨长明
Original Assignee
青岛海信激光显示股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN202121803465.2U external-priority patent/CN215264363U/zh
Priority claimed from CN202110886876.0A external-priority patent/CN115704987A/zh
Priority claimed from CN202121798200.8U external-priority patent/CN215264362U/zh
Priority claimed from CN202110888282.3A external-priority patent/CN115704989A/zh
Priority claimed from CN202121811576.8U external-priority patent/CN215264364U/zh
Priority claimed from CN202110886888.3A external-priority patent/CN115704988A/zh
Application filed by 青岛海信激光显示股份有限公司 filed Critical 青岛海信激光显示股份有限公司
Priority to CN202280052554.9A priority Critical patent/CN117751324A/zh
Publication of WO2023011052A1 publication Critical patent/WO2023011052A1/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

Definitions

  • the present disclosure relates to the technical field of projection display, and in particular, to a projection device and a projection screen.
  • a projection device mainly includes an optical engine and a projection screen.
  • the light outlet of the optical engine faces the projection screen to emit the light beam to the projection screen, and the projection screen is configured to reflect the light beam to realize the display of the picture.
  • a projection device in one aspect, includes a projection screen and an optical engine, the projection screen is configured to display a projection image, the projection screen includes a base, a lifting mechanism, a curtain and a curling mechanism, the lifting The mechanism is arranged on the base, the first side of the curtain is connected to the lifting mechanism, the curling mechanism is arranged on the base, and the curling mechanism is connected to the second side of the curtain , the lifting mechanism is connected to the third side and the fourth side of the screen, and the optical engine is configured to emit light beams to the projection screen.
  • a projection screen in another aspect, includes a base, a lifting mechanism, a curtain and a curling mechanism, the lifting mechanism is arranged on the base, and the first side of the curtain is connected to the lifting mechanism.
  • Mechanism connection the curling mechanism is arranged on the base, the curling mechanism is connected with the second side of the curtain, and the lifting mechanism is connected with the third side and the fourth side of the curtain.
  • Fig. 1 is a structural diagram of a projection device according to some embodiments.
  • Fig. 2 is a partial enlarged view of circle A in Fig. 1;
  • Fig. 3 is a structural diagram of a curtain according to some embodiments.
  • Figure 4 is a structural diagram of another screen according to some embodiments.
  • Fig. 5 is a structural diagram of a projection screen in an unfolded state according to some embodiments.
  • Fig. 6 is a structural diagram of a projection screen in a retracted state according to some embodiments.
  • Fig. 7 is a structural diagram of another projection screen in an unfolded state according to some embodiments.
  • Fig. 8 is a structural diagram of another projection screen in an unfolded state according to some embodiments.
  • Fig. 9 is a perspective view of yet another projection screen in an unfolded state according to some embodiments.
  • Fig. 10 is a partial enlarged view of circle B in Fig. 9;
  • Fig. 11 is a structural diagram of another projection screen in an unfolded state according to some embodiments.
  • Fig. 12 is a structural diagram of yet another projection screen in an unfolded state according to some embodiments.
  • Fig. 13 is a partial enlarged view at circle C in Fig. 12;
  • Fig. 14 is a structural diagram of another projection screen in an unfolded state according to some embodiments.
  • Fig. 15 is a partial enlarged view at circle D in Fig. 14;
  • Fig. 16 is a structural diagram of yet another projection screen in an unfolded state according to some embodiments.
  • Fig. 17 is a partial enlarged view at circle E in Fig. 16;
  • Fig. 18 is a structural diagram of yet another projection screen in an unfolded state according to some embodiments.
  • Fig. 19 is a partial enlarged view at circle F in Fig. 18;
  • Fig. 20 is a structural diagram of another projection screen in an unfolded state according to some embodiments.
  • Fig. 21 is a structural diagram of yet another projection screen in an unfolded state according to some embodiments.
  • Fig. 22 is a partial enlarged view of circle G in Fig. 21;
  • Fig. 23 is a structural diagram of another projection screen in an unfolded state according to some embodiments.
  • Figure 24 is a partially enlarged view of circle H in Figure 23;
  • Fig. 25 is a structural diagram of another projection screen in a retracted state according to some embodiments.
  • Fig. 26 is a structural diagram of yet another projection screen in an unfolded state according to some embodiments.
  • Fig. 27 is a structural diagram of another projection screen in an unfolded state according to some embodiments.
  • Fig. 28 is a partial enlarged view of circle I in Fig. 27 .
  • first and second are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as “first” and “second” may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality” means two or more.
  • the expressions “coupled” and “connected” and their derivatives may be used.
  • the term “connected” may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other.
  • the term “coupled” may be used when describing some embodiments to indicate that two or more elements are in direct physical or electrical contact.
  • the terms “coupled” or “communicatively coupled” may also mean that two or more elements are not in direct contact with each other, but yet still co-operate or interact with each other.
  • the embodiments disclosed herein are not necessarily limited by the context herein.
  • At least one of A, B and C has the same meaning as “at least one of A, B or C” and both include the following combinations of A, B and C: A only, B only, C only, A and B A combination of A and C, a combination of B and C, and a combination of A, B and C.
  • a and/or B includes the following three combinations: A only, B only, and a combination of A and B.
  • parallel As used herein, “parallel”, “perpendicular”, and “equal” include the stated situation and the situation similar to the stated situation, the range of the similar situation is within the acceptable deviation range, wherein the The acceptable deviation ranges are as determined by one of ordinary skill in the art taking into account the measurement in question and errors associated with measurement of the particular quantity (ie, limitations of the measurement system).
  • “parallel” includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; Deviation within 5°.
  • “Equal” includes absolute equality and approximate equality, where the difference between the two that may be equal is less than or equal to 5% of either within acceptable tolerances for approximate equality, for example.
  • a projection device 1000 includes an optical engine 100 and a projection screen 200 .
  • the optical engine 100 is configured to emit light beams to the projection screen 200 to realize image display.
  • the optical engine 100 may be an ultra-short-focus optical engine, and the ultra-short-focus optical engine may be a digital light processing (Digital Light Processing, DLP) optical engine.
  • DLP Digital Light Processing
  • the orientation expressions of up, down, left, right, front, and rear in this disclosure refer to the state of the projection device when it is in use.
  • the side of the projection screen 200 close to the optical engine 100 is defined as the front side
  • the side of the projection screen 200 far away from the optical engine 100 is defined as the rear side
  • the height direction of the projection screen 200 is up and down.
  • the left-right direction of the projection device 1000 is opposite to the user's left-right direction, for example, the left side of the projection device is the user's right side
  • the right side of the projection device 1000 is the user's left side.
  • the projection screen 200 includes: a base 1 , a curling mechanism 2 , a lifting mechanism 3 and a curtain 4 .
  • the curling mechanism 2 and the lifting mechanism 3 are fixedly connected with the base 1 .
  • the first side 43 of the curtain 4 is fixedly connected to the lifting mechanism 3
  • the second side 44 of the curtain 4 is fixedly connected to the curling mechanism 2
  • the first side 43 is opposite to the second side 44 .
  • the curling mechanism 2 includes a rotatable drum 21
  • the second side 44 of the curtain 4 is fixedly connected to the drum 21 .
  • the first side 43 is the upper side of the curtain 4
  • the second side 44 is the lower side of the curtain 4 .
  • the lifting mechanism 3 includes a lifting frame 37 and a beam 32
  • the lifting frame 37 includes a first sub-lifting frame 31 .
  • the first end of the first sub-lifting frame 31 is connected to the beam 32
  • the second end of the first sub-lifting frame 31 is connected to the base 1
  • the first side 43 of the curtain 4 is fixedly connected to the beam 32 .
  • the first side 43 of the curtain 4 is raised or lowered by the first sub-lifting frame 31, and the reel 21 of the curling mechanism 2 rotates around the second side 44 of the curtain 4, so that the curtain 4 can be folded or closed. Expand.
  • the first sub-lifting frame 31 is a scissor type lifting frame, a folding type lifting frame or a retractable type lifting frame and the like.
  • the first sub-lift 31 is fixedly connected to the base 1 through a hinge shaft;
  • the first sub-lift 31 is a retractable lift , the first sub-lifting frame 31 is fixedly connected to the base 1 through fasteners (such as fixing screws, etc.).
  • the display area of the curtain 4 is rectangular, and the pictures displayed on the curtain 4 can cover the display area of the curtain 4 , which is beneficial to improve the display effect of the pictures on the curtain 4 .
  • the curtain 4 includes an optical film 41 , and the opposite first side 411 and second side 412 of the optical film 41 are fixedly connected to the lifting mechanism 3 and the curling mechanism 2 respectively.
  • the first side 411 is fixedly connected with the lifting mechanism 3
  • the second side 412 is fixedly connected with the curling mechanism 2 .
  • the optical film 41 is a white plastic screen, a gray plastic screen, a black grid screen or a rollable polyethylene terephthalate (PET) composite film designed with a Fresnel structure.
  • the curtain 4 includes an optical film 41 and a flexible carrier 42, and a surface (for example, the back) of the optical film 41 away from the display area is fixed on the flexible carrier 42, and the flexible carrier 42
  • the upper opposite first side 421 and the second side 422 are fixedly connected with the lifting mechanism 3 and the curling mechanism 2 respectively. In this way, the connection between the screen 4 and the lifting mechanism 3 and the curling mechanism 2 can be realized through the flexible carrier 42 , and the support for the optical film 41 can also be realized.
  • the optical film 41 when the optical film 41 is used, only the irradiated area corresponding to the projected light beam displays a picture, thus, an optical film 41 having an area equal to the irradiated area corresponding to the projected light beam can be used, which can reduce the cost of the screen 4 .
  • the size of the optical film 41 is 1661 mm*934 mm.
  • the flexible carrier 42 is a material piece that is not easily deformed and has high tensile strength, so as to ensure the curling of the flexible carrier 42 and avoid deformation of the flexible carrier 42 under the action of external force.
  • the flexible carrier 42 is a synthetic cloth made of polyester filaments that are not easily deformed and have high tensile strength.
  • the dimension of the optical film 41 along the length direction of the curling mechanism 2 is smaller than the dimension of the flexible carrier 42 along the length direction of the curling mechanism 2 . In this way, when the flexible carrier 42 is fixed (for example, bonded) to the optical film 41, the edge of the optical film 41 can be prevented from protruding from the flexible carrier 42, so that various parts of the optical film 41 can be effectively fixed.
  • the dimension of the optical film 41 along the length direction of the curling mechanism 2 may also be equal to the dimension of the flexible carrier 42 along the length direction of the curling mechanism 2 .
  • the dimension of the optical film 41 along the length direction of the curling mechanism 2 may also be equal to the dimension of the flexible carrier 42 along the length direction of the curling mechanism 2 .
  • the third side 45 and the fourth side 46 of the curtain 4 are fixedly connected to the lifting mechanism 3, and the third side 45 and the fourth Sides 46 are opposite.
  • the third side 45 and the fourth side 46 of the curtain 4 are the left side and the right side of the curtain 4 respectively.
  • the third side 45 and the fourth side 46 of the curtain 4 can be fixed by the lifting mechanism 3 , so that the surface of the curtain 4 is smoother and the display effect of the curtain 4 is improved.
  • the lifting mechanism 3 and the screen 4 can be fixed by magnetic attraction or bonding.
  • a magnetic coating can be set on the curtain 4 by spraying, sticking or printing, or the magnetic material (for example, magnetic powder), etc., and the material of the lifting mechanism 3 is metal, or a metal coating is set on the surface of the lifting mechanism 3, so as to realize the attachment between the curtain 4 and the lifting mechanism 3 by the adsorption between the magnetic material and the metal coating. fixed.
  • Metal coatings for example, metal powder
  • metal materials for example, metal powder
  • the material is a magnetic material, or a magnetic coating is provided on the surface of the lifting mechanism 3, so as to realize the fixation between the curtain 4 and the lifting mechanism 3 through the adsorption between the metal material and the magnetic coating.
  • a magnetic coating can also be provided on the screen 4 by spraying, pasting or printing, or doping with magnetic materials (such as magnetic powder) etc. during the production of the screen 4, and the material of the lifting mechanism 3 is a magnetic material , or a magnetic coating is provided on the surface of the lifting mechanism 3 to realize the fixation between the curtain 4 and the lifting mechanism 3 through the adsorption between the magnetic material and the magnetic coating.
  • the third side 45 and the fourth side 46 of the curtain 4 can be fixed by the first sub-lift frame 31 .
  • other fixing structures can also be added on the basis of the first sub-lifting frame 31 , and then the third side 45 and the fourth side 46 of the screen 4 can be fixed through other fixing structures.
  • the fixing of the curtain 4 will be introduced in combination with the structure of the lifting mechanism 3 .
  • the first sub-lift frame 31 includes a first folding rod 311 and a second folding rod 312 . Both ends of the first folding rod 311 are rotatably connected to the base 1 and the beam 32 respectively, and both ends of the second folding rod 312 are rotatably connected to the base 1 and the beam 32 respectively.
  • the first folding rod 311 is arranged along the third side 45 of the curtain 4
  • the second folding rod 312 is arranged along the fourth side 46 of the curtain 4 .
  • the third side 45 of the curtain 4 is adsorbed and fixed to the first folding rod 311
  • the fourth side 46 of the curtain 4 is adsorbed and fixed to the second folding rod 312 .
  • the third side 45 and the fourth side 46 of the screen 4 can be fixed by the first folding rod 311 and the second folding rod 312 .
  • the first part of the back side of the curtain 4 near the third side 45 and the second part near the fourth side 46 are all provided with a magnetic coating, and the first folding rod 311 and the second folding rod 312 are compatible with the first part and the second folding rod 312.
  • the corresponding parts of the two parts are provided with a metal coating, and the metal coating is attracted to the magnetic coating, so that the fixing of the first folding rod 311 and the third side 45 of the screen 4, and the fixing of the second folding rod 312 and the screen can be realized.
  • first folding rod 311 and the second folding rod 312 are in the elongated structure, it is beneficial for the first folding rod 311 and the second folding rod 312 to fit better on the first part of the curtain 4 near the third side 45 and the second part of the curtain 4 close to the fourth side 46 , so as to effectively fix the third side 45 and the fourth side 46 of the curtain 4 by the first folding rod 311 and the second folding rod 312 .
  • the first sub-lift frame 31 also includes a first support rod 313, a second support rod 314 and a lead screw 315, and the first end of the first support rod 313 is connected to the first end of the first support rod 313.
  • a folding rod 311 is rotatably connected, the second end of the first support rod 313 is slidably connected with the lead screw, the first end of the second support rod 314 is rotatably connected with the second folding rod 312, and the second end of the second support rod 314 The end is slidably connected with the leading screw 315.
  • the first end of the first support rod 313 and the first end of the second support rod 314 drive the first folding rod 311 and The second folding rod 312 is folded, so as to realize the folding of the curtain 4 .
  • the first support rod 313 and the second support rod 314 can support the first folding rod 311 and the second folding rod respectively. 312, so that both the first folding rod 311 and the second folding rod 312 are propped up (or unfolded) into elongated structures.
  • first folding rod 311 and the second folding rod 312 will continue to be in contact with the back of the screen 4 during the process of propping up, and the screen 4 can be smoothed from the center to the side, thereby facilitating the improvement of the screen 4. Flatness after unfolding.
  • the magnetic coating can be set on the entire back of the curtain 4, or a plurality of strip-shaped magnetic coatings can be set on the back of the curtain 4, as long as it can ensure that the back of the curtain 4 is compatible with the first folding rod 311 and the second folding rod 312. Just connect.
  • a plurality of strip-shaped magnetic coatings at least include magnetic coatings located at the first part of the curtain 4 near the third side 45 and the second part near the fourth side 46, and the widths of the plurality of strip-shaped magnetic coatings can be the same , can also be different.
  • the lifting frame 37 further includes a second sub-lifting frame 33 .
  • the second sub-lifting frame 33 includes a third folding rod 331 and a fourth folding rod 332, the two ends of the third folding rod 331 are respectively rotatably connected with the base 1 and the beam 32, and the two ends of the fourth folding rod 332 are respectively connected with the base Seat 1, beam 32 are rotatably connected.
  • the cross beam 32 can drive the third folding rod 331 and the fourth folding rod 332 to expand into a strip-like structure.
  • the third folding rod 331 and the first folding rod 311 are respectively arranged on both sides of the curtain 4 along the thickness direction, and the third folding rod 331 is opposite to the first folding rod 311, and the fourth folding rod 332 is opposite to the second folding rod 312. They are respectively disposed on both sides of the curtain 4 along the thickness direction, and the fourth folding rod 332 is opposite to the second folding rod 312 .
  • the third part of the curtain 4 having a surface (for example, the front side) of the display area close to the third side 45 is adsorbed and fixed with the third folding rod 331, and the front side of the curtain 4 is close to the fourth side
  • the fourth part of 46 is adsorbed and fixed to the fourth folding rod 332 .
  • the third folding rod 331 and the fourth folding rod 332 are elongated, it is beneficial for the third folding rod 331 and the fourth folding rod 332 to fit better on the third side of the curtain 4 near the third side 45 . part and the fourth part of the curtain 4 close to the fourth side 46 to realize the effective fixing of the third folding rod 331 and the fourth folding rod 332 to the third side 45 and the fourth side 46 of the curtain 4 .
  • the second sub-lifting frame 33 is positioned on both sides of the front of the screen 4 after being raised, the third folding rod 331 is arranged in the non-display area of the screen 4 near the third side 45 at this time, and the fourth folding rod 332 is close to the third side 45.
  • the fourth side 46 is arranged in the non-display area of the curtain 4, and the width of the third folding bar 331 and the width of the fourth folding bar 332 are less than or equal to the third side 45 and the fourth side 46 on the curtain 4. The width of the non-display area. In this way, the second sub-lifting frame 33 can be avoided from covering the screen 4 .
  • the front of the curtain 4 is provided with a magnetic coating on the third part near the third side 45 and the fourth part near the fourth side 46, and the third folding rod 331 and the fourth folding rod 332 are connected with the third part and the fourth folding rod 332.
  • Corresponding parts of the four parts are provided with a metal coating, and the metal coating and the magnetic coating are sucked together.
  • the third folding rod 331 can be fixed to the third part of the front of the screen 4 near the third side 45
  • the fourth folding rod 332 can be fixed to the fourth part of the front of the screen 4 near the fourth side 46 .
  • the entire non-display area on both sides is provided with a magnetic coating, to increase the fixed area between the screen 4 and the third folding rod 331 and the fourth folding rod 332, to ensure that the curtain 4 and the third folding rod 331 1.
  • the stability of the connection of the fourth folding rod 332 During the unfolding process, the third folding rod 331 and the fourth folding rod 332 will continue to contact with the front of the curtain 4, so that the curtain 4 can be smoothed from the center to the side, which is beneficial to further improve the flatness of the curtain 4 after unfolding .
  • the lifting mechanism 3 further includes a tension member 34, the two ends of the tension member 34 are fixedly connected to the curling mechanism 2 and the beam 32 respectively, and the third side of the curtain 4 45 .
  • the fourth side 46 is fixedly connected to the tension member 34 . In this way, during the process of unfolding or retracting the curtain 4, the synchronous lifting of the tension member 34 and the curtain 4 can be realized.
  • the tension member 34 and the curtain 4 can be fixed by bonding or by magnetic attraction.
  • the material of tension member 34 can be metal materials such as stainless steel, aluminum alloy, also can be non-metallic materials such as polyethylene terephthalate (Polyethylene Terephthalate, PET), polyimide, cloth, rubber, as long as can It is enough to ensure that the flatness of the tension member 34 is better than that of the curtain 4 .
  • the tensioning member 34 is fixed on the back of the screen 4 , or, as shown in FIGS. 9 and 10 , the tensioning member 34 is fixed on the front of the screen 4 .
  • the lifting mechanism 3 includes a plurality of pull
  • the tension members 34 are in a belt-like structure, and a plurality of tension members 34 are arranged at preset distances along the length direction of the crimping mechanism 2 .
  • the back side of the screen 4 is provided with a tension member 34 near the first part of the third side 45, and the back side of the screen 4 is fixedly connected with a tension member 34 near the second part of the fourth side 46.
  • a tension member 34 can make the curtain 4 more flat, thereby helping to improve the display effect of the curtain 4.
  • the tension member 34 When the tension member 34 is fixed on the front of the curtain 4, as shown in Figure 9 and Figure 10, the tension member 34 is in a belt-like structure, and the two tension members 34 are connected to the third side 45 and the fourth side of the curtain 4 respectively.
  • the sides 46 are fixedly connected. In this way, the fixing of the third side 45 and the fourth side 46 of the curtain 4 can be realized through the two tensioning pieces 34 , and the screen displayed on the curtain 4 can be prevented from being blocked by the two tensioning pieces 34 .
  • the curling mechanism 2 may include one roll 21 or two rolls 21 .
  • the tensioning member 34 and the curtain 4 can be fixed on the same reel 21; when the curling mechanism 2 includes two reels 21, the tensioning member 34 and the curtain 4 can also be fixed On a different roll 21.
  • the lifting mechanism 3 includes a first clamping part 35 and a second clamping part 36, the first clamping part 35 clamps the fifth part of the curtain 4 close to the third side 45, and the second clamping part 36 clamps the sixth portion of the curtain 4 near the fourth side 46 .
  • the first clamping part 35 or the second clamping part 36 is any two of the first sub-lifting frame 31, the second sub-lifting frame 33, and the tension member 34, and the third side 45 and the fourth side of the screen Fixing the edge 46 is beneficial to improving the flatness of the curtain 4 and improving the display effect of the curtain 4 .
  • the principle of clamping the screen 4 by the first clamping part 35 and the second clamping part 36 is as follows: after the first clamping part 35 and the second clamping part 36 clamp the screen 4, they will squeeze the screen 4 close to the second clamping part.
  • the fifth part of the three sides 45 and the sixth part of the curtain 4 close to the fourth side 46, so that there is a distance between the fifth part of the curtain 4 close to the third side 45 and the first clamping part 35 of the curtain 4
  • There is an interaction force in the thickness direction and there is an interaction force in the thickness direction of the screen 4 between the sixth portion of the curtain 4 near the fourth side 46 and the second clamping portion 36 .
  • the thickness of the fifth part of the curtain 4 near the third side 45 and the thickness of the sixth part of the curtain 4 near the fourth side 46 are greater than the thickness of the display area of the curtain 4, so that the thickness of the curtain 4 can be enlarged.
  • the friction force between the fifth part of the curtain 4 and the first clamping part 35, and between the sixth part of the screen 4 and the second clamping part 36 is conducive to improving the first clamping part 35 and the second clamping part 36. Clamping effect on curtain 4.
  • the two sides (such as the front and the back) of the screen 4 are fixed together by the first sub-lifting frame 31 and the second sub-lifting frame 33.
  • the first sub-lifting frame 31 Fix the first part near the third side 45 and the second part near the fourth side 46 on the back side of the screen 4, and the second sub-lift frame 33 is close to the third part of the front of the screen 4 near the third side 45, The fourth portion near the fourth side 46 is fixed.
  • the fifth part includes the first part and the third part
  • the sixth part includes the second part and the fourth part.
  • first sub-lifting frame 31 includes a first folding bar 311 and a second folding bar 312
  • second sub-lifting frame 33 includes a third folding bar 331 and a fourth folding bar 332, on the plane where the screen 4 is located
  • the orthographic projection of the first folding rod 311 overlaps with the orthographic projection of the third folding rod 331
  • the orthographic projection of the second folding rod 312 overlaps with the orthographic projection of the fourth folding rod 332.
  • the three folding rods 331 can constitute the first clamping portion 35
  • the second clamping portion 36 can be constituted by the second folding rod 312 and the fourth folding rod 332 .
  • the two sides of the screen 4 are fixed together by the first sub-lifting frame 31 and the tension member 34.
  • the first sub-lifting frame 31 pairs the first part
  • the second part near the fourth side 46 is fixed
  • the two tension members 34 respectively fix the third part near the third side 45 and the fourth part near the fourth side 46 of the front of the screen 4 .
  • the tension member 34 and the first sub-lift frame 31 are located on the front and rear sides of the curtain 4 respectively, and the fifth part of the curtain 4 near the third side 45 is clamped on the second side.
  • the sixth portion of the curtain 4 near the fourth side 46 is clamped between the first sub-lift frame 31 and another tension member 34 .
  • the fifth part and the sixth part of the screen 4 can be clamped by the first sub-lifting frame 31 and the two tension members 34, thereby realizing the third side 45 and the fourth side 46 of the screen 4. fixed.
  • the side of the tensioning member 34 facing the curtain 4 is a plane after being unfolded, so that the clamping effect of the first sub-lifting frame 31 and the tensioning member 34 on the curtain 4 can be improved, which is conducive to improving the stability of the curtain 4. flatness.
  • the tension member 34 When the tension member 34 is attached to the front of the curtain 4, as shown in Figure 16 and Figure 17, the two tension members 34 positioned at the front of the curtain 4 are in a belt-like structure, and the two tension members 34 are attached to the curtain 4 respectively.
  • the front side of the front side is close to the third part of the third side 45, and the fourth part is close to the fourth side 46. In this way, the tension member 34 can be prevented from covering the screen display area on the curtain 4 .
  • the orthographic projection of the first folding rod 311 and the corresponding orthographic projection of the tension member 34 Overlap, the orthographic projection of the second folding rod 312 and the orthographic projection of the corresponding tensioning member 34 partially overlap, so that the first clamping portion 35 can be formed by the first folding rod 311 and the corresponding tensioning member 34, and the first clamping portion 35 can be formed by the second folding rod 311.
  • the folding rod 312 and the corresponding tension member 34 can constitute the second clamping portion 36 .
  • the two sides of the curtain 4 are fixed together by the second sub-lifting frame 33 and the plurality of tension members 34 .
  • the second sub-lift frame 33 fixes the third part near the third side 45 and the fourth part near the fourth side 46 on the front of the screen 4, and some tension members 34 in the plurality of tension members 34 fixes the first part of the back of the screen 4 near the third side 45 , and some tension members 34 in the plurality of tension members fix the second part of the back of the screen 4 near the fourth side 46 .
  • the fifth part of the curtain 4 near the third side 45 and the sixth part near the fourth side 46 are clamped between the tensioning member 34 and the second sub-lifting frame 33 .
  • the fifth part and the sixth part of the screen 4 can be clamped by the second sub-lift frame 33 and the tension member 34, thereby realizing the fixing of the third side 45 and the fourth side 46 of the screen 4 .
  • the tensioning member 34 After the tensioning member 34 is unfolded, the side close to the curtain 4 is flat, so that the clamping effect of the second sub-lifting frame 33 and the tensioning member 34 on the curtain 4 can be improved. In addition, since the tension member 34 is attached to the back of the curtain 4 , it does not block the display area of the curtain 4 .
  • the tension member 34 as a belt-shaped structure as an example
  • the second sub-lifting frame 33 includes the third folding rod 331 and the fourth folding rod 332
  • the front of the third folding rod 331 The projection overlaps with the orthographic projection of the corresponding tension member 34
  • the orthographic projection of the fourth folding rod 332 overlaps with the orthographic projection of the corresponding tension member 34.
  • the third folding rod 331 and the corresponding tension member 34 The first clamping portion 35 can be formed, and the second clamping portion 36 can be formed by the fourth folding rod 332 and the corresponding tension member 34 .
  • the tension member 34 includes a plurality of sub-tension members 341, some of the plurality of sub-tension members 341 are located on the front of the screen 4, and some of the plurality of sub-tension members 341 Some are located on the back of the curtain 4.
  • the sub-tightening parts 341 at the back of the screen 4 fix at least the first part of the back side of the screen 4 near the third side 45 and the second part near the fourth side 46, and the plurality of sub-tensioning parts 341 fix the screen respectively. 4.
  • the third part near the third side 45 on the front side and the fourth part near the fourth side 46 are fixed. In this way, the two sides of the screen 4 can be fixed through the plurality of sub-tensioning members 341 .
  • the projection screen 200 further includes a pressing mechanism 5 connected to the base 1 , and the pressing mechanism 5 is movable in a direction perpendicular to the plane where the screen 4 is located.
  • the pressing mechanism 5 contacts the curtain 4 or the tension member 34 .
  • the pressing mechanism 5 is pressed on the side of the screen 4 away from the first sub-lifting frame 31 to reduce the contact between the screen 4 and the first folding rod 311. , the distance between the second folding rods 312, thereby increasing the stability of the connection between the back of the screen 4 and the first folding rods 311 and the second folding rods 312.
  • a pressing mechanism 5 can also be set on the side of the tension member 34 away from the curtain 4, so that the pressure on the tension member 34 can be adjusted by the pressing mechanism 5. Tightening force, to increase the tension member 34 and the second sub-lifting frame 33, or the tension member 34 positioned at the front of the screen 4 and the clamping force of the tension member 34 positioned at the back of the screen 4 to the screen 4.
  • the pressing mechanism 5 includes a slide block 51, an adjustment screw 52 and a pressing roller 53
  • the base 1 includes a base body 13, a protrusion 11 and a guide rail 12, and the protrusion
  • the lifter 11 and the guide rail 12 are arranged on the base body 13 .
  • the slider 51 is slidably connected to the guide rail 12
  • the protrusion 11 is located at the end of the guide rail 12 along the length direction
  • the length direction of the guide rail 12 is substantially perpendicular to the plane where the curtain 4 is located.
  • the adjustment screw 52 is respectively connected with the protrusion 11 and the slider 51 , and the length direction of the adjustment screw 52 is roughly parallel to the length direction of the guide rail 12 .
  • the adjusting screw 52 is configured to adjust the distance between the protrusion 11 and the slider 51 .
  • the end of the pressing roller 53 is fixedly connected with the slider 51 .
  • the adjusting screw 52 When the screen 4 is unfolded, the adjusting screw 52 is rotated in the first direction (eg, clockwise), so that the slider 51 slides along the guide rail 12 toward the screen 4, thereby driving the pinch roller 53 to move in the direction near the screen 4.
  • the adjusting screw 52 When the screen 4 is closed, the adjusting screw 52 is rotated in a second direction opposite to the first direction (such as counterclockwise), so that the slider 51 slides along the guide rail 12 in a direction away from the screen 4, thereby driving the pinch roller 53 Move in the direction away from the curtain 4.
  • the longitudinal direction of the guide rail 12 is perpendicular to the plane where the curtain 4 is unfolded after the curtain 4 is deployed when the first lifting frame 31 is raised, that is, the longitudinal direction of the guide rail 12 and the plane where the curtain 4 is deployed after the curtain 4 is deployed when the first lifting frame 31 is raised.
  • the value range of the included angle of the plane is 88 ° to 92 °, for example, the included angle of the plane where the curtain 4 is located after the curtain 4 unfolds when the length direction of the guide rail 12 and the first lifting frame 31 rises is 88 °, 90 ° or 92° etc.
  • the base 1 includes a base 14 and an accommodating portion 15.
  • the base 14 is located in the accommodating space in the accommodating portion 15.
  • the accommodating portion 15 blocks the curling mechanism 2 and the lifting mechanism 3 to raise the projection screen 200. aesthetics.
  • the curtain 4 is accommodated in the accommodating portion 15 , which not only prevents dust from adhering to the curtain 4 , but also protects the curtain 4 .
  • the accommodating portion 15 can also accommodate the optical engine 100 , so as to realize the integration of the projection screen 200 and the optical engine 100 .
  • the accommodating portion 15 has a light-transmitting area 121 and an opening 122
  • the optical engine 100 is disposed in the light-transmitting area 121
  • the projection screen 200 is disposed in the opening 122
  • the curtain 4 can be stretched out from the opening 122 and unfolded.
  • the light beam emitted by the optical engine 100 can pass through the light-transmitting area 121 and emit to the screen 4 .
  • the lifting mechanism 3 also includes a first smoothing mechanism 10 and a second smoothing mechanism 6, and the first smoothing mechanism 10 and the second smoothing mechanism 6 are fixed on the base 1 or the beam 32 .
  • the first smoothing mechanism 10 and the second smoothing mechanism 6 are positioned at the same side of the curtain 4 (such as the front or the back side). Take the back as an example.
  • the first smoothing mechanism 10 and the second smoothing mechanism 6 are in contact with the back side of the curtain 4, and the first smoothing mechanism 10 can rotate around a corner of the curtain 4 by the first side 43 or the second side 44 until the curtain 4 approaches The first part of the third side 45 , the second smoothing mechanism 6 can rotate around a corner of the screen 4 from the first side 43 or the second side 44 to the second part of the screen 4 close to the fourth side 46 .
  • the first smoothing mechanism 10 and the second smoothing mechanism 6 can be to rotate in the process that curtain 4 is unfolded, also can be to rotate after curtain 4 unfolds, as long as can play the effect of smoothing to curtain 4 and get final product. In this way, since the first smoothing mechanism 10 and the second smoothing mechanism 6 are all in contact with the screen 4, the screen 4 has a direction toward the third side 45 or when the first smoothing mechanism 10 and the second smoothing mechanism 6 rotate.
  • the smoothing effect toward the fourth side 46 is beneficial to ensure the flatness of the curtain 4 and improve the display effect of the curtain 4 .
  • the first smoothing mechanism 10 includes a first rotating motor 101 and a first smoothing rod 102 , the output shaft of the first rotating motor 101 and the first smoothing rod 102
  • One end of the first rotary motor 101 is fixedly connected, and the length direction (such as the axial direction) of the output shaft of the first rotating motor 101 is perpendicular to the plane where the screen 4 is located.
  • the first smoothing bar 102 is attached to the back of the screen 4 , and the first rotating motor 101 is disposed at a corner of the screen 4 close to the third side 45 .
  • the first rotating electrical machine 101 is located at the intersection of the third side 45 and the first side 43 ; or, the first rotating electrical machine 101 is located at the intersection of the third side 45 and the second side 44 .
  • the first rotating motor 101 is configured to drive the first smoothing rod 102 to rotate from the first side 43 or the second side 44 of the screen 4 to the first part of the screen 4 close to the third side 45 when the screen 4 is unfolded.
  • the screen 4 is smoothed to ensure the flatness of the screen 4 .
  • the first part of the curtain 4 can be constrained to avoid the occurrence of the contraction of the first part of the curtain 4 to the central area of the curtain 4. Wrinkles, curling and other deformations.
  • the length direction of the rotated first smoothing bar 102 is parallel to the third side 45 of the screen 4 , so that the first smoothing bar 102 can be prevented from covering the display area of the screen 4 .
  • the length of the first smoothing bar 102 is equal to the length of the third side 45 of the curtain 4 , so that after the curtain 4 is unfolded, the first smoothing bar 102 can be used to effectively constrain the third side 45 of the curtain 4 .
  • the length of the first smoothing bar 102 may also be shorter than the length of the third side 45 of the curtain 4, as long as the first smoothing bar 102 can ensure the flatness of the display area after the curtain 4 is unfolded. Can.
  • the structure and installation position of the second smoothing mechanism 6 are similar to those of the first smoothing mechanism 10 , and will not be repeated here.
  • the constraint of the first smoothing mechanism 10 on the first part of the curtain 4 near the third side 45 is the same as the constraint of the second smoothing mechanism 6 on the second part of the curtain 4 close to the fourth side 46,
  • the following mainly introduces the restriction of the first smoothing mechanism 10 on the first part of the curtain 4 close to the third side 45 as an example.
  • the principle that the first smoothing mechanism 10 constrains the third side 45 of the screen 4 is as follows: during the rotation of the first smoothing rod 102, the deformation such as wrinkles of the screen 4 will be driven to the screen 4 close to the third side 45 After the first smoothing rod 102 rotates to the first part of the screen 4 close to the third side 45, the first smoothing rod 102 has a squeezing effect on the deformation of the screen 4 such as wrinkles and curls, for example, the first There is an interaction force between a smoothing rod 102 and the first portion of the screen 4 near the third side 45 in the thickness direction of the screen 4 . When the curtain 4 shrinks based on factors such as its own stress, the first part of the curtain 4 close to the third side 45 will generate friction with the side of the first smoothing bar 102 close to the curtain 4, thereby realizing the third adjustment of the curtain 4. Side 45 constraints.
  • the thickness of the first part of the curtain 4 close to the third side 45 is greater than the thickness of the display area of the curtain 4, so as to increase the distance between the first part of the curtain 4 close to the third side 45 and the first smoothing bar 102 The friction between them is beneficial to improve the constraint effect of the first smoothing bar 102 on the screen 4 .
  • the first smoothing rod 102 and the first part of the screen 4 near the third side 45 can also be fixed to ensure Constraint stability of the first part of the screen 4 by the first smoothing bar 102 .
  • the first smoothing bar 102 and the first part of the screen 4 close to the third side 45 are detachably connected (such as magnetic attraction, etc.) ) to achieve fixation.
  • the first part of the screen 4 near the third side 45 is provided with a magnetic coating by spraying, pasting, printing, etc., or doped with magnetic materials (such as magnetic powder) during the production of the screen 4, and the first
  • the material of the smoothing bar 102 is a metal material, or a metal coating is provided on the side of the first smoothing bar 102 close to the screen 4, so as to achieve fixation through the adsorption between the magnetic material and the metal material.
  • a metal coating is provided on the first part of the curtain 4 near the third side 45, and the material of the first smoothing bar 102 is a magnetic material, so as to realize fixing through the adsorption between the metal coating and the magnetic material.
  • both the first smoothing mechanism 10 and the second smoothing mechanism 6 are fixed on the base 1 .
  • the first smoothing mechanism 10 includes a first rotating motor 101 and the second smoothing mechanism 6 includes a second rotating motor
  • the first rotating motor 101 and the second rotating motor are respectively fixed on the base 1 .
  • the base 1 includes a base 14 and an accommodating portion 15, the first rotating motor 101 and the second rotating motor are fixed in the accommodating portion 15, which is beneficial to improve the aesthetics of the projection screen.
  • first smoothing mechanism 10 includes a first smoothing bar 102 and the second smoothing mechanism 6 includes a second smoothing bar
  • first smoothing bar 102 and the second smoothing bar are retracted. from the housing portion 15.
  • first smoothing bar 102 is rotated from the second side 44 of the curtain 4 to the first part of the curtain 4 close to the third side 45
  • second smoothing bar is rotated from the second side 44 of the curtain 4 to the first part of the curtain 4.
  • the second part of the curtain 4 is close to the fourth side 46 to realize the constraint of the third side 45 and the fourth side 46 of the curtain 4 .
  • the lifting mechanism 3 when the lifting mechanism 3 includes a lifting frame 37 and a beam 32, and the lifting frame 37 includes a first sub-lifting frame 31, as shown in Figure 21 and Figure 22, the first smoothing mechanism 10, the second The smoothing mechanism 6 is fixed on the crossbeam 32 .
  • first smoothing mechanism 10 includes a first rotating motor 101 and the second smoothing mechanism 6 includes a second rotating motor
  • first rotating motor 101 and the second rotating motor are fixed on the beam 32 .
  • the projection screen further includes a bezel 9 .
  • the frame 9 includes a frame body 91 and two side walls 92 .
  • the frame body 91 is disposed on the beam 32
  • the two side walls 92 are respectively connected to the frame body 91 and located on the front and back of the curtain 4 .
  • the frame 9 is covered on the top of the beam 32, the first side 43 of the curtain 4, the first rotating motor 101 and the second rotating motor, so as to cover the first rotating motor 101 and the second rotating motor through the frame 9, thereby ensuring the projection screen aesthetics.
  • the first smoothing rod 102 and the second smoothing rod are retracted between the two side walls 92 of the frame 9, thereby improving the aesthetics of the projection screen.
  • the first sub-lifting frame 31 includes the first folding bar 311 and the second folding bar 312
  • first smoothing mechanism 10 and the second smoothing mechanism 6 when the first smoothing mechanism 10 and the second smoothing mechanism 6 are located at the front of the screen 4, by the first folding
  • the rod 311 and the first smoothing rod 102 can realize the clamping effect of the fifth part of the curtain 4 close to the third side 45
  • the second folding rod 312 and the second smoothing rod can realize the clamping effect of the curtain 4 close to the third side 45.
  • the clamping effect of the sixth part of the four sides 46 is beneficial to ensure the restraining effect on the third side 45 and the fourth side 46 of the curtain 4 .
  • the screen 4 can be close to the third side 45 through the third folding rod 331 and the first smoothing rod 102.
  • the clamping effect of the fifth part, the clamping effect of the sixth part of the curtain 4 close to the fourth side 46 can be realized through the fourth folding rod 332 and the second smoothing rod, thereby helping to ensure the clamping effect of the curtain 4 Constraining effect of the third side 45 and the fourth side 46 .
  • the pressing mechanism 5 is located on the side of the screen 4 away from the first smoothing mechanism 10 .
  • the pressing mechanism 5 is pressed against the screen 4 to impel the screen 4 to be close to the first smoothing mechanism 10 and the second smoothing mechanism 6, that is, to impel the screen 4 to be close to each other.
  • the first smoothing bar 102 and the second smoothing bar are used to ensure the restraining effects of the first smoothing bar 102 and the second smoothing bar on the first side 43 and the second side 44 of the curtain 4 .
  • the pressing mechanism 5 was positioned at the backside of the curtain 4; , the pressing mechanism 5 is positioned at the front of the curtain 4.
  • the lifting mechanism 3 further includes a third smoothing mechanism 7 and a fourth smoothing mechanism 8, the third smoothing mechanism 7, the fourth smoothing mechanism 8 and the screen 4 Contact, when the curtain 4 is unfolded, the third smoothing mechanism 7 rotates to the first part of the curtain 4 close to the third side 45, the fourth smoothing mechanism 8 rotates to the second part of the curtain 4 close to the fourth side 46, the first The smoothing mechanism 10 and the second smoothing mechanism 6 are fixed on the beam 32 , and the third smoothing mechanism 7 and the fourth smoothing mechanism 8 are fixed on the base 1 .
  • the structure of the third smoothing mechanism 7 and the fourth smoothing mechanism 8 is similar to the structure of the first smoothing mechanism 10.
  • the constraint is similar to the constraint of the first smoothing mechanism 10 on the screen 4 approaching the third side 45 , and will not be repeated here.
  • the sum of the length of the first smoothing bar 102 and the length of the third smoothing bar is equal to the length of the third side 45 of the screen 4, thereby ensuring that the first smoothing bar 102 and the third smoothing bar can be applied to the first smoothing bar 4 of the screen 4. Effective constraints on three sides 45 .
  • the sum of the length of the first smoothing bar 102 and the length of the third smoothing bar may also be less than the length of the third side 45 of the curtain 4, as long as the display area of the curtain 4 is unfolded can be ensured. Just flatness.

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Abstract

一种投影装置（1000），投影装置（1000）包括投影屏幕（100）和光学引擎（200），投影屏幕（100）被配置为显示投影画面，投影屏幕（100）包括基座（1）、升降机构（3）、幕布（4）和卷曲机构（2），升降机构（3）设置在基座（1）上，幕布（4）的第一侧边（43）与升降机构（3）连接，卷曲机构（2）设置在基座（1）上，卷曲机构（2）与幕布（4）的第二侧边（44）连接，升降机构（3）与幕布（4）的第三侧边（45）和第四侧边（46）连接，光学引擎（200）被配置为将光束出射至投影屏幕（100）。

Description

投影装置和投影屏幕
本申请要求于2021年08月03日提交的、申请号为202110888282.3的中国专利申请的优先权，于2021年08月03日提交的、申请号为202121803465.2的中国专利申请的优先权，于2021年08月03日提交的、申请号为202110886888.3的中国专利申请的优先权，于2021年08月03日提交的、申请号为202121798200.8的中国专利申请的优先权，于2021年08月03日提交的、申请号为202110886876.0的中国专利申请的优先权，于2021年08月03日提交的、申请号为202121811576.8的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本公开涉及投影显示技术领域，尤其涉及一种投影装置和投影屏幕。
背景技术
随着科技的不断发展，投影装置越来越多地应用于人们的工作和生活中。目前，投影装置主要包括光学引擎和投影屏幕。光学引擎的出光口朝向投影屏幕，以将光束出射至投影屏幕，投影屏幕被配置为反射该光束，以实现画面的显示。
发明内容
一方面，提供一种投影装置，所述投影装置包括投影屏幕和光学引擎，所述投影屏幕被配置为显示投影画面，所述投影屏幕包括基座、升降机构、幕布和卷曲机构，所述升降机构设置在所述基座上，所述幕布的第一侧边与所述升降机构连接，所述卷曲机构设置在所述基座上，所述卷曲机构与所述幕布的第二侧边连接，所述升降机构与所述幕布的第三侧边和第四侧边连接，所述光学引擎被配置为将光束出射至所述投影屏幕。
另一方面，提供一种投影屏幕，所述投影屏幕包括基座、升降机构、幕布和卷曲机构，所述升降机构设置在所述基座上，所述幕布的第一侧边与所述升降机构连接，所述卷曲机构设置在所述基座上，所述卷曲机构与所述幕布的第二侧边连接，所述升降机构与所述幕布的第三侧边和第四侧边连接。
附图说明
为了更清楚地说明本公开中的技术方案，下面将对本公开一些实施例中所需要使用的附图作简单地介绍，然而，下面描述中的附图仅仅是本公开的一些实施例的附图，对于本领域普通技术人员来讲，还可以根据这些附图获得其他的附图。此外，以下描述中的附图可以视作示意图，并非对本公开实施例所涉及的产品的实际尺寸、方法的实际流程、信号的实际时序等的限制。
图1是根据一些实施例的一种投影装置的结构图；
图2是图1中圈A处的局部放大图；
图3是根据一些实施例的一种幕布的结构图；
图4是根据一些实施例的另一种幕布的结构图；
图5是根据一些实施例的一种投影屏幕处于展开状态的结构图；
图6是根据一些实施例的一种投影屏幕处于收起状态的结构图；
图7是根据一些实施例的另一种投影屏幕处于展开状态的结构图；
图8是根据一些实施例的又一种投影屏幕处于展开状态的结构图；
图9是根据一些实施例的又一种投影屏幕处于展开状态的立体图；
图10是图9中圈B处的局部放大图；
图11是根据一些实施例的又一种投影屏幕处于展开状态的结构图；
图12是根据一些实施例的又一种投影屏幕处于展开状态的结构图；
图13是图12中圈C处的局部放大图；
图14是根据一些实施例的又一种投影屏幕处于展开状态的结构图；
图15是图14中圈D处的局部放大图；
图16是根据一些实施例的又一种投影屏幕处于展开状态的结构图；
图17是图16中圈E处的局部放大图；
图18是根据一些实施例的又一种投影屏幕处于展开状态的结构图；
图19是图18中圈F处的局部放大图；
图20是根据一些实施例的又一种投影屏幕处于展开状态的结构图；
图21是根据一些实施例的又一种投影屏幕处于展开状态的结构图；
图22是图21中圈G处的局部放大图；
图23是根据一些实施例的又一种投影屏幕处于展开状态的结构图；
图24是图23中圈H的局部放大图；
图25是根据一些实施例的又一种投影屏幕处于收起状态的结构图；
图26是根据一些实施例的又一种投影屏幕处于展开状态的结构图；
图27是根据一些实施例的又一种投影屏幕处于展开状态的结构图；
图28是图27中圈I处的局部放大图。
具体实施方式
下面将结合附图，对本公开一些实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公开所提供的实施例，本领域普通技术人员所获得的所有其他实施例，都属于本公开保护的范围。
除非上下文另有要求，否则，在整个说明书和权利要求书中，术语“包括(comprise)”及其其他形式例如第三人称单数形式“包括(comprises)”和现在分词形式“包括(comprising)”被解释为开放、包含的意思，即为“包含，但不限于”。在说明书的描述中，术语“一个实施例(one embodiment)”、“一些实施例(some embodiments)”、“示例性实施例(exemplary embodiments)”、“示例(example)”、“特定示例(specific example)”或“一些示例(some examples)”等旨在表明与该实施例或示例相关的特定特征、结构、材料或特性包括在本公开的至少一个实施例或示例中。上述术语的示意性表示不一定是指同一实施例或示例。此外，所述的特定特征、结构、材料或特点可以以任何适当方式包括在任何一个或多个实施例或示例中。
以下，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本公开实施例的描述中，除非另有说明，“多个”的含义是两个或两个以上。
在描述一些实施例时，可能使用了“耦接”和“连接”及其衍伸的表达。例如，描述一些实施例时可能使用了术语“连接”以表明两个或两个以上部件彼此间有直接物理接触或电接触。又如，描述一些实施例时可能使用了术语“耦接”以表明两个或两个以上部件有直接物理接触或电接触。然而，术语“耦接”或“通信耦合(communicatively coupled)”也可能指两个或两个以上部件彼此间并无直接接触，但仍彼此协作或相互作用。这里所公开的实施例并不必然限制于本文内容。
“A、B和C中的至少一个”与“A、B或C中的至少一个”具有相同含义，均包括以下A、B和C的组合：仅A，仅B，仅C，A和B的组合，A和C的组合，B和C的组合，及A、B和C的组合。
“A和/或B”，包括以下三种组合：仅A，仅B，及A和B的组合。
本文中“适用于”或“被配置为”的使用意味着开放和包容性的语言，其不排除适用于或被配置为执行额外任务或步骤的设备。
如本文所使用的那样，“约”、“大致”或“近似”包括所阐述的值以及处于特定值的可接受偏差范围内的平均值，其中所述可接受偏差范围如由本领域普通技术人员考虑到正在讨论的测量以及与特定量的测量相关的误差(即，测量系统的局限性)所确定。
如本文所使用的那样，“平行”、“垂直”、“相等”包括所阐述的情况以及与所阐述的情况相近似的情况，该相近似的情况的范围处于可接受偏差范围内，其中所述可接受偏差范围如由本领域普通技术人员考虑到正在讨论的测量以及与特定量的测量相关的误差(即，测量系统的局限性)所确定。例如，“平行”包括绝对平行和近似平行，其中近似平行的可接受偏差范围例如可以是5°以内偏差；“垂直”包括绝对垂直和近似垂直，其 中近似垂直的可接受偏差范围例如也可以是5°以内偏差。“相等”包括绝对相等和近似相等，其中近似相等的可接受偏差范围内例如可以是相等的两者之间的差值小于或等于其中任一者的5％。
如图1和图2所示，投影装置1000包括光学引擎100和投影屏幕200。光学引擎100被配置为出射光束至投影屏幕200，以实现画面的显示。
光学引擎100可以为超短焦光学引擎，该超短焦光学引擎可以为数字光处理(Digital Light Procession，DLP)光学引擎。这样，可以缩小光学引擎100与投影屏幕200所在平面的垂直距离，以减小投影装置1000的占用空间。
为了便于叙述，如无特殊说明，本公开对于上、下、左、右、前、后的方位表述均以投影装置使用时的状态为参考。定义投影屏幕200的靠近光学引擎100的一侧为前侧，投影屏幕200的远离光学引擎100的一侧为后侧，投影屏幕200的高度方向为上、下方向。投影装置1000的左右方向与用户的左右方向相反，例如投影装置的左侧为用户的右侧、投影装置1000的右侧为用户的左侧。
如图1和图2所示，投影屏幕200包括：基座1、卷曲机构2、升降机构3和幕布4。卷曲机构2、升降机构3与基座1固定连接。幕布4的第一侧边43与升降机构3固定连接，幕布4的第二侧边44与卷曲机构2固定连接，第一侧边43和第二侧边44相对。卷曲机构2包括可旋转的卷筒21，幕布4的第二侧边44与卷筒21固定连接。例如，当投影屏幕200处于展开状态时，第一侧边43为幕布4的上侧边，第二侧边44为幕布4的下侧边。
如图1和图2所示，升降机构3包括升降架37和横梁32，升降架37包括第一子升降架31。第一子升降架31的第一端与横梁32连接，第一子升降架31的第二端与基座1连接，幕布4的第一侧边43与横梁32固定连接。这样，通过第一子升降架31将幕布4的第一侧边43升起或下降，配合卷曲机构2的卷筒21绕幕布4的第二侧边44旋转，可以实现幕布4的收起或展开。
例如，第一子升降架31为剪叉式升降架、折叠式升降架或者升缩式升降架等。当第一子升降架31为剪叉式升降架或者折叠式升降架时，第一子升降架31通过铰接轴与基座1固定连接，当第一子升降架31为升缩式升降架时，第一子升降架31通过紧固件(如固定螺钉等)与基座1固定连接。
在一些实施例中，幕布4的显示区域为矩形，幕布4上显示的画面可以铺满幕布4的显示区域，从而有利于提高幕布4上画面的显示效果。
在一些实施例中，如图3所示，幕布4包括光学膜片41，光学膜片41上相对的第一边411、第二边412分别与升降机构3、卷曲机构2固定连接。例如，第一边411与升降机构3固定连接，第二边412与卷曲机构2固定连接。光学膜片41为白塑幕、灰塑幕、黑栅幕或可卷曲的设计有菲涅尔结构的聚对苯二甲酸乙二醇酯(Polyethylene Terephthalate，PET)复合膜片等。
在一些实施例中，如图4所示，幕布4包括光学膜片41和柔性载体42，光学膜片41的远离显示区域的一表面(例如，背面)固定在柔性载体42上，柔性载体42上相对的第一边421、第二边422分别与升降机构3、卷曲机构2固定连接。这样，通过柔性载体42可以实现幕布4与升降机构3、卷曲机构2的连接，并且，也实现对光学膜片41的支撑。
需要说明的是，在使用光学膜片41时，只有对应投影光束的照射区域显示画面，由此，可采用面积与对应投影光束的照射区域相等的光学膜片41，这样可以降低幕布4的成本。例如，光学膜片41的尺寸为1661毫米*934毫米。
柔性载体42为不易变形、且抗拉强度较高的材料件，以保证柔性载体42的卷曲，且避免柔性载体42在外力作用下的变形。例如，柔性载体42为不易变形、抗拉强度较高的涤纶丝制成的合成布。
光学膜片41沿卷曲机构2的长度方向的尺寸小于柔性载体42沿卷曲机构2的长度方向的尺寸。这样，在柔性载体42与光学膜片41固定(例如，粘接)时，能 够防止光学膜片41的边缘伸出柔性载体42，从而可以实现光学膜片41的各个部分的有效固定。
当然，在一些实施例中，如图4所示，光学膜片41沿卷曲机构2的长度方向的尺寸也可以等于柔性载体42沿卷曲机构2的长度方向的尺寸。这样，在固定光学膜片41时，便于将光学膜片41的边缘与柔性载体42的边缘对齐，在光学膜片41尺寸一定的情况下，有利于减小幕布4的尺寸。并且，在显示画面时幕布4沿卷曲机构2的长度方向不留空白，有利于提高幕布4的画面显示效果。
在一些实施例中，如图1和图2所示，在幕布4展开后，幕布4的第三侧边45和第四侧边46与升降机构3固定连接，第三侧边45和第四侧边46相对。例如，在幕布4展开后，幕布4的第三侧边45和第四侧边46分别为幕布4的左侧边和右侧边。这样，在幕布4展开后，通过升降机构3可以实现对幕布4的第三侧边45和第四侧边46的固定，使幕布4表面更为平整，提高了幕布4的显示效果。
这里，升降机构3与幕布4之间可通过磁吸、粘接的方式实现固定。
当通过磁吸的方式实现升降机构3与幕布4之间的固定时，可在幕布4上通过喷涂、粘贴或印刷等方式设置磁性涂层，或者在幕布4的制作过程中掺杂磁性材料(例如，磁粉)等，并且，升降机构3的材料为金属，或者在升降机构3的表面设置金属涂层，以通过磁性材料与金属涂层之间的吸附实现幕布4与升降机构3之间的固定。
也可在幕布4上通过喷涂、粘贴或印刷等方式设置金属涂层(例如，金属粉)，或者在幕布4的制作过程中掺杂金属材料(例如，金属粉)等，并且，升降机构3的材料为磁性材料，或者在升降机构3的表面设置磁性涂层，以通过金属材料与磁性涂层之间的吸附实现幕布4与升降机构3之间的固定。
当然，也可在幕布4上通过喷涂、粘贴或印刷等方式设置磁性涂层，或者在幕布4的制作过程中掺杂磁性材料(例如，磁粉)等，并且，升降机构3的材料为磁性材料，或者在升降机构3的表面设置磁性涂层，以通过磁性材料与磁性涂层之间的吸附实现幕布4与升降机构3之间的固定。
在幕布4展开后，可通过第一子升降架31对幕布4的第三侧边45和第四侧边46进行固定。当然，也可以在第一子升降架31的基础上增设其他固定结构，进而通过其他固定结构对幕布4的第三侧边45和第四侧边46进行固定。接下来结合升降机构3的结构对幕布4的固定进行介绍。
在一些实施例中，如图1、图2和图6所示，第一子升降架31包括第一折叠杆311和第二折叠杆312。第一折叠杆311的两端分别与基座1、横梁32可旋转连接，第二折叠杆312的两端分别与基座1、横梁32可旋转连接。当幕布4展开后，第一折叠杆311沿幕布4的第三侧边45设置，第二折叠杆312沿幕布4的第四侧边46设置。当幕布4展开后，幕布4的第三侧边45与第一折叠杆311吸附固定，幕布4的第四侧边46与第二折叠杆312吸附固定。这样，通过第一折叠杆311和第二折叠杆312可实现对幕布4的第三侧边45和第四侧边46的固定。
例如，幕布4的背面靠近第三侧边45的第一部分和靠近第四侧边46的第二部分均设置有磁性涂层，第一折叠杆311和第二折叠杆312的与第一部分和第二部分的对应处设置有金属涂层，金属涂层与磁性涂层吸合，这样，可以实现第一折叠杆311与幕布4的第三侧边45的固定，以及第二折叠杆312与幕布4的第四侧边46的固定。
由于第一折叠杆311和第二折叠杆312均呈长条状结构，有利于第一折叠杆311和第二折叠杆312更好地贴合在幕布4的靠近第三侧边45的第一部分和幕布4靠近第四侧边46的第二部分，以实现第一折叠杆311和第二折叠杆312对幕布4的第三侧边45和第四侧边46的有效固定。
如图1、图2、图6和图26所示，第一子升降架31还包括第一支撑杆313、第二支撑杆314和丝杠315，第一支撑杆313的第一端与第一折叠杆311可旋转连接， 第一支撑杆313的第二端与丝杠滑动连接，第二支撑杆314的第一端与第二折叠杆312可旋转连接，第二支撑杆314的第二端与丝杠315滑动连接。
当第一支撑杆313的第二端与第二支撑杆314的第二端彼此靠近时，第一支撑杆313的第一端与第二支撑杆314的第一端带动第一折叠杆311和第二折叠杆312折叠，从而实现幕布4的收起。当第一支撑杆313的第二端与第二支撑杆314的第二端彼此远离时，第一支撑杆313和第二支撑杆314即可分别撑起第一折叠杆311和第二折叠杆312，以使第一折叠杆311和第二折叠杆312均撑起(或展开)为长条状结构。
可以理解的是，在第一折叠杆311和第二折叠杆312撑起的过程中会持续与幕布4的背面接触，可以对幕布4从中心至侧边进行抚平，从而有利于提高幕布4展开后的平整度。
由于第一折叠杆311和第二折叠杆312固定在幕布4的背面，并不会影响投影屏幕的美观性。例如，可在幕布4的整个背面设置磁性涂层，或者在幕布4的背面设置多个呈带状的磁性涂层，只要能够保证幕布4的背面与第一折叠杆311和第二折叠杆312连接即可。多个带状的磁性涂层至少包括位于幕布4靠近第三侧边45的第一部分和靠近第四侧边46的第二部分的磁性涂层，多个带状的磁性涂层的宽度可以相同，也可以不同。
在一些实施例中，如图5所示，升降架37还包括第二子升降架33。第二子升降架33包括第三折叠杆331和第四折叠杆332，第三折叠杆331的两端分别与基座1、横梁32可旋转连接，第四折叠杆332的两端分别与基座1、横梁32可旋转连接。当第一子升降架31升起时可通过横梁32带动第三折叠杆331、第四折叠杆332展开为长条状结构。第三折叠杆331与第一折叠杆311分别设置于幕布4的沿厚度方向上的两侧，且第三折叠杆331与第一折叠杆311相对，第四折叠杆332与第二折叠杆312分别设置于幕布4的沿厚度方向上的两侧，且第四折叠杆332与第二折叠杆312相对。
例如，当幕布4展开后，幕布4的具有显示区域的一表面(例如，正面)靠近第三侧边45的第三部分与第三折叠杆331吸附固定，幕布4的正面靠近第四侧边46的第四部分与第四折叠杆332吸附固定。
由于第三折叠杆331和第四折叠杆332均呈长条状结构，有利于第三折叠杆331和第四折叠杆332更好地贴合在幕布4的靠近第三侧边45的第三部分和幕布4靠近第四侧边46的第四部分，以实现第三折叠杆331和第四折叠杆332对幕布4的第三侧边45和第四侧边46的有效固定。
另外，由于第二子升降架33升起后位于幕布4的正面的两侧，此时第三折叠杆331靠近第三侧边45设置于幕布4的非显示区域内，第四折叠杆332靠近第四侧边46设置于幕布4的非显示区域内，并使第三折叠杆331的宽度、第四折叠杆332的宽度小于或等于幕布4上靠近第三侧边45、第四侧边46的非显示区域的宽度。这样，可以避免第二子升降架33遮挡幕布4。幕布4的正面靠近第三侧边45的第三部分和靠近第四侧边46的第四部分均设置有磁性涂层，第三折叠杆331和第四折叠杆332的与第三部分和第四部分的对应处设置有金属涂层，金属涂层磁性涂层吸合。这样，可以实现第三折叠杆331与幕布4正面靠近第三侧边45的第三部分，以及第四折叠杆332与幕布4的正面靠近第四侧边46的第四部分的固定。
或者，在幕布4上两侧整个非显示区域设置有磁性涂层，以增大幕布4与第三折叠杆331和第四折叠杆332之间的固定面积，保证幕布4与第三折叠杆331、第四折叠杆332连接的稳固性。在第三折叠杆331和第四折叠杆332展开的过程中会持续与幕布4的正面接触，从而可以对幕布4从中心至侧边进行抚平，有利于进一步提高幕布4展开后的平整度。
在一些实施例中，如图6至图10所示，升降机构3还包括拉紧件34，拉紧件34的两端分别与卷曲机构2、横梁32固定连接，幕布4的第三侧边45、第四侧边 46与拉紧件34固定连接。这样，在幕布4展开或收起的过程中，可以实现拉紧件34与幕布4的同步升降。
拉紧件34与幕布4之间可以通过粘接的方式固定，或者通过磁吸的方式固定。拉紧件34的材料可以为不锈钢、铝合金等金属材料，也可以为聚对苯二甲酸乙二醇酯(Polyethylene Terephthalate，PET)、聚酰亚胺、布、橡胶等非金属材料，只要能保证拉紧件34的平整度优于幕布4的平整度即可。
如图6至图8所示，拉紧件34固定在幕布4的背面，或者，如图9和图10所示，拉紧件34固定在幕布4的正面。
当拉紧件34固定在幕布4的背面时，如图6或图7所示，拉紧件34的面积大致等于幕布4的面积；或者，如图8所示，升降机构3包括多个拉紧件34，各拉紧件34呈带状结构，多个拉紧件34沿卷曲机构2的长度方向按预设距离排布。例如，幕布4的背面靠近第三侧边45的第一部分设置有一个拉紧件34，幕布4的背面靠近第四侧边46的第二部分固定连接有一个拉紧件34，这样，通过多个拉紧件34可以使幕布4更为平整，从而有利于提高幕布4的显示效果。
当拉紧件34固定在幕布4的正面时，如图9和图10所示，拉紧件34呈带状结构，两个拉紧件34分别与幕布4的第三侧边45、第四侧边46固定连接。这样，通过两个拉紧件34不仅可以实现幕布4第三侧边45和第四侧边46的固定，还可以防止两个拉紧件34遮挡幕布4上显示的画面。
需要说明的是，卷曲机构2可以包括一个卷筒21或两个卷筒21。当卷曲机构2包括一个卷筒21时，拉紧件34和幕布4可以固定在同一个卷筒21上；当卷曲机构2包括两个卷筒21时，拉紧件34和幕布4也可以固定在不同的卷筒21上。
上述描述了对幕布4的一侧面(正面或背面)进行固定的情况，当然，为了保证对幕布4的第三侧边45和第四侧边46的固定效果，可以在幕布4的两面(正面和背面)对幕布4进行固定，从而增大对幕布4的约束力，更有利于提高幕布4的平整度。
如图11所示，升降机构3包括第一夹持部35和第二夹持部36，第一夹持部35夹持幕布4靠近第三侧边45的第五部分，第二夹持部36夹持幕布4靠近第四侧边46的第六部分。
第一夹持部35或第二夹持部36为第一子升降架31、第二子升降架33、拉紧件34中的任意两者，对幕布的第三侧边45和第四侧边46进行固定，有利于提高幕布4的平整度，提高幕布4的显示效果。
第一夹持部35、第二夹持部36对幕布4夹持的原理如下：在第一夹持部35和第二夹持部36夹持幕布4后，会挤压幕布4的靠近第三侧边45的第五部分和幕布4的靠近第四侧边46的第六部分，从而使得幕布4靠近第三侧边45的第五部分与第一夹持部35之间在幕布4的厚度方向上存在相互作用力，幕布4靠近第四侧边46的第六部分与第二夹持部36之间在幕布4的厚度方向上存在相互作用力。而在幕布4基于自身应力等因素收缩时，幕布4靠近第三侧边45的第五部分会与第一夹持部35之间产生摩擦力，幕布4靠近第四侧边46的第六部分会与第二夹持部36之间产生摩擦力，从而实现对幕布4的第三侧边45和第四侧边46的固定。
需要说明的是，幕布4靠近第三侧边45的第五部分的厚度、幕布4靠近第四侧边46的第六部分的厚度大于幕布4的显示区域的厚度，这样，可以增大幕布4的第五部分与第一夹持部35之间，以及幕布4的第六部分与第二夹持部36之间的摩擦力，有利于提高第一夹持部35和第二夹持部36对幕布4的夹持效果。
接下来结合升降机构3的结构对幕布4的夹持限位进行介绍。
在一些实施例中，如图12和图13所示，通过第一子升降架31和第二子升降架33共同实现对幕布4的两面(如正面和背面)固定，第一子升降架31对幕布4背面靠近第三侧边45的第一部分、靠近第四侧边46的第二部分进行固定，并且，第二子升降架33对幕布4正面靠近第三侧边45的第三部分、靠近第四侧边46的 第四部分进行固定。这里，第五部分包括第一部分和第三部分，第六部分包括第二部分和第四部分。
在第一子升降架31包括第一折叠杆311和第二折叠杆312，第二子升降架33包括第三折叠杆331和第四折叠杆332的情况下，在幕布4所在的平面上，第一折叠杆311的正投影和第三折叠杆331的正投影部分重叠，第二折叠杆312的正投影和第四折叠杆332的正投影部分重叠，如此，通过第一折叠杆311和第三折叠杆331可构成第一夹持部35，通过第二折叠杆312和第四折叠杆332可构成第二夹持部36。
如图14和图15所示，通过第一子升降架31和拉紧件34共同实现对幕布4的两面固定，第一子升降架31对幕布4背面靠近第三侧边45的第一部分、靠近第四侧边46的第二部分进行固定，并且，两个拉紧件34分别对幕布4正面的靠近第三侧边45的第三部分、靠近第四侧边46的第四部分进行固定。
如图16和图17所示，幕布4展开后，拉紧件34和第一子升降架31分别位于幕布4的前后两侧，幕布4靠近第三侧边45的第五部分夹持在第一子升降架31和一个拉紧件34之间，幕布4靠近第四侧边46的第六部分夹持在第一子升降架31和另一个拉紧件34之间。这样，通过第一子升降架31和两个拉紧件34可以实现对幕布4的第五部分和第六部分的夹持，从而实现对幕布4的第三侧边45和第四侧边46的固定。
在一些实施例中，拉紧件34展开后朝向幕布4的一侧面为平面，这样，可以提高第一子升降架31和拉紧件34对幕布4的夹持效果，有利于提高幕布4的平整度。
当拉紧件34贴合在幕布4的正面时，如图16和图17所示，位于幕布4正面的两个拉紧件34呈带状结构，两个拉紧件34分别贴合幕布4的正面靠近第三侧边45的第三部分、靠近第四侧边46的第四部分。这样，可以防止拉紧件34遮挡幕布4上的画面显示区域。
在第一子升降架31包括第一折叠杆311和第二折叠杆312的情况下，在幕布4所在的平面上，第一折叠杆311的正投影和对应的拉紧件34的正投影部分重叠，第二折叠杆312的正投影和对应的拉紧件34的正投影部分重叠，如此，通过第一折叠杆311和对应的拉紧件34可构成第一夹持部35，通过第二折叠杆312和对应的拉紧件34可构成第二夹持部36。
在一些实施例中，通过第二子升降架33和多个拉紧件34共同实现对幕布4的两面固定。例如，第二子升降架33对幕布4正面靠近第三侧边45的第三部分、靠近第四侧边46的第四部分进行固定，并且，多个拉紧件34中的一些拉紧件34对幕布4背面靠近第三侧边45的第一部分进行固定、多个拉紧件中的一些拉紧件34对幕布4背面靠近第四侧边46的第二部分进行固定。
如图5至图8所示，幕布4靠近第三侧边45的第五部分、靠近第四侧边46的第六部分夹持在拉紧件34和第二子升降架33之间。这样，通过第二子升降架33和拉紧件34可实现对幕布4的第五部分和第六部分的夹持，从而实现对幕布4的第三侧边45和第四侧边46的固定。
拉紧件34展开后靠近幕布4的一侧面为平面，这样，可以提高第二子升降架33和拉紧件34对幕布4的夹持效果。另外，由于拉紧件34贴合在幕布4的背面，并不会遮挡幕布4的显示区域。
以拉紧件34呈带状结构为例，在第二子升降架33包括第三折叠杆331和第四折叠杆332的情况下，在幕布4所在的平面上，第三折叠杆331的正投影和对应的拉紧件34的正投影部分重叠，第四折叠杆332的正投影和对应的拉紧件34的正投影部分重叠，如此，通过第三折叠杆331和对应的拉紧件34可构成第一夹持部35，通过第四折叠杆332和对应的拉紧件34可构成第二夹持部36。
在一些实施例中，如图16和图17所示，拉紧件34包括多个子拉紧件341，多 个子拉紧件341中的一些位于幕布4的正面，多个子拉紧件341中的一些位于幕布4的背面。位于幕布4背面的子拉紧件341至少对幕布4背面靠近第三侧边45的第一部分、靠近第四侧边46的第二部分进行固定，并且，通过多个子拉紧件341分别对幕布4正面靠近第三侧边45的第三部分、靠近第四侧边46的第四部分进行固定。这样，通过多个子拉紧件341可以实现对幕布4的两面固定。
在一些实施例中，如图18和图19所示，投影屏幕200还包括压紧机构5，压紧机构5与基座1连接，压紧机构5沿垂直幕布4所在平面的方向可移动。当幕布4展开后，压紧机构5与幕布4接触或者与拉紧件34接触。这样，以幕布4的背面与第一子升降架31固定为例，压紧机构5压紧在幕布4上远离第一子升降架31的一侧，以减小幕布4与第一折叠杆311、第二折叠杆312之间的距离，从而增大幕布4的背面与第一折叠杆311、第二折叠杆312之间连接的稳固性。
需要说明的是，对于采用拉紧件34夹紧幕布4时，也可以在拉紧件34远离幕布4的一侧设置压紧机构5，从而通过压紧机构5调整对拉紧件34的压紧力度，以增大拉紧件34和第二子升降架33，或者位于幕布4正面的拉紧件34和位于幕布4背面的拉紧件34对幕布4的夹紧力度。
在一些实施例中，如图18和图19所示，压紧机构5包括滑块51、调节螺杆52和压紧辊53，基座1包括基座本体13、凸起11和导轨12，凸起11和导轨12设置在基座本体13上。滑块51与导轨12可滑动连接，凸起11位于导轨12的沿长度方向上的端部，导轨12的长度方向大致垂直于幕布4所在的平面。调节螺杆52分别与凸起11、滑块51连接，调节螺52的长度方向与导轨12的长度方向大致平行。调节螺杆52被配置为调整凸起11和滑块51之间的距离。压紧辊53的端部与滑块51固定连接。
当幕布4展开时，沿第一方向(如顺时针)旋转调节螺杆52，以使滑块51沿导轨12向靠近幕布4的方向滑动，从而带动压紧辊53沿靠近幕布4的方向移动。当幕布4收起时，沿与该第一方向相反的第二方向(如逆时针)旋转调节螺杆52，以使滑块51沿导轨12向远离幕布4的方向滑动，从而带动压紧辊53沿远离幕布4的方向移动。导轨12的长度方向垂直于第一升降架31升起时幕布4展开后幕布4所在的平面，也即是导轨12的长度方向与第一升降架31升起时幕布4展开后幕布4所在的平面的夹角的取值范围为88°至92°，例如，导轨12的长度方向与第一升降架31升起时幕布4展开后幕布4所在的平面的夹角为88°、90°或92°等。
如图20所示，基座1包括底座14和容置部15，底座14位于容置部15内的容置空间中，通过容置部15遮挡卷曲机构2和升降机构3，提高投影屏幕200的美观性。另外，当幕布4收起时，幕布4收纳在容置部15内，不仅可以防止幕布4上粘附灰尘，还可保护幕布4。
容置部15除了能够收纳投影屏幕200之外，容置部15还能够收纳光学引擎100，以实现投影屏幕200与光学引擎100的一体化。如图20所示，容置部15具有透光区121和开口122，光学引擎100设置于透光区121内，投影屏幕200设置于开口122内，幕布4能够从开口122伸出并展开，光学引擎100出射的光束能够通过透光区121并出射至幕布4。
如图21和图22所示，升降机构3还包括第一抚平机构10和第二抚平机构6，第一抚平机构10和第二抚平机构6固定在基座1或横梁32上。第一抚平机构10和第二抚平机构6位于幕布4的同一侧(如正面或背面)，为了便于叙述，以下主要以第一抚平机构10和第二抚平机构6位于幕布4的背面为例进行介绍。
第一抚平机构10、第二抚平机构6与幕布4的背面接触，第一抚平机构10能够由第一侧边43或第二侧边44绕幕布4的一个角旋转至幕布4靠近第三侧边45的第一部分，第二抚平机构6能够由第一侧边43或第二侧边44绕幕布4的一个角旋转至幕布4靠近第四侧边46的第二部分。
第一抚平机构10和第二抚平机构6可以是在幕布4展开的过程中旋转，也可 以是在幕布4展开后旋转，只要能够对幕布4起到抚平的作用即可。这样，由于第一抚平机构10、第二抚平机构6均与幕布4接触，从而在第一抚平机构10、第二抚平机构6旋转时对幕布4具有向第三侧边45或向第四侧边46的抚平效果，有利于保证幕布4的平整度，提高幕布4的显示效果。
在一些实施例中，如图21和图22所示，第一抚平机构10包括第一旋转电机101和第一抚平杆102，第一旋转电机101的输出轴与第一抚平杆102的一端固定连接，第一旋转电机101的输出轴的长度方向(如轴向)垂直于幕布4所在的平面。第一抚平杆102贴合幕布4的背面，第一旋转电机101设置于幕布4的靠近第三侧边45的一个角。例如，第一旋转电机101位于第三侧边45与第一侧边43的交汇处；或者，第一旋转电机101位于第三侧边45与第二侧边44的交汇处。第一旋转电机101被配置为驱动第一抚平杆102在幕布4展开时由幕布4的第一侧边43或第二侧边44旋转至幕布4靠近第三侧边45的第一部分。
这样，在第一抚平杆102旋转的过程中，实现对幕布4的抚平，以保证幕布4的平整度。另外，在第一抚平杆102旋转至幕布4靠近第三侧边45的第一部分后，可对幕布4的第一部分进行约束，避免因幕布4的第一部分向幕布4的中心区域收缩而发生褶皱、卷边等变形。
旋转后的第一抚平杆102的长度方向与幕布4的第三侧边45平行，这样，可以防止第一抚平杆102遮挡幕布4的显示区域。第一抚平杆102的长度等于幕布4的第三侧边45的长度，这样，在幕布4展开后，便于通过第一抚平杆102实现对幕布4的第三侧边45有效约束。
当然，在一些实施例中，第一抚平杆102的长度也可以小于幕布4的第三侧边45的长度，只要能够通过第一抚平杆102保证幕布4展开后显示区域的平整度即可。
需要说明的是，第二抚平机构6的结构和设置位置与第一抚平机构10类似，在此不再赘述。
在一些实施例中，第一抚平机构10对幕布4靠近第三侧边45的第一部分的约束与第二抚平机构6对幕布4靠近第四侧边46的第二部分的约束相同，以下主要以第一抚平机构10对幕布4靠近第三侧边45的第一部分的约束为例进行介绍。
第一抚平机构10对幕布4的第三侧边45进行约束的原理如下：在第一抚平杆102的旋转过程中会将幕布4的褶皱等变形驱赶至幕布4靠近第三侧边45的第一部分，在第一抚平杆102旋转至幕布4靠近第三侧边45的第一部分后，第一抚平杆102对幕布4的褶皱、卷边等变形具有挤压效果，例如，第一抚平杆102与幕布4靠近第三侧边45的第一部分在幕布4的厚度方向上存在相互作用力。而在幕布4基于自身应力等因素收缩时，幕布4靠近第三侧边45的第一部分会与第一抚平杆102上靠近幕布4的一侧面产生摩擦力，从而实现对幕布4的第三侧边45的约束。
在一些实施例中，幕布4靠近第三侧边45的第一部分的厚度大于幕布4的显示区域的厚度，以增大幕布4靠近第三侧边45的第一部分与第一抚平杆102之间的摩擦力，有利于提高第一抚平杆102对幕布4的约束效果。
通过第一抚平杆102实现对幕布4靠近第三侧边45的第一部分的约束后，还可以将第一抚平杆102与幕布4靠近第三侧边45的第一部分进行固定，以保证第一抚平杆102对幕布4的第一部分的约束稳定性。
第一抚平杆102旋转至幕布4靠近第三侧边45的第一部分之后，第一抚平杆102与幕布4靠近第三侧边45的第一部分之间通过可拆卸连接(如磁吸等)实现固定。
例如，幕布4靠近第三侧边45的第一部分通过喷涂、粘贴、印刷等方式设置有磁性涂层，或者在幕布4的制作过程中掺杂磁性材料(例如，磁粉)等，并且，第一抚平杆102的材料为金属材料，或者在第一抚平杆102上靠近幕布4的一侧面设置有金属涂层，以通过磁性材料与金属材料之间的吸附实现固定。或者，幕布4靠近第三侧边45的第一部分设置金属涂层，并且，第一抚平杆102的材料为磁性 材料，以通过金属涂层与磁性材料之间的吸附实现固定。
以下对本公开一些实施例的第一抚平机构10和第二抚平机构6的固定位置进行介绍。
在一些实施例中，如图23、图24或图25所示，第一抚平机构10和第二抚平机构6均固定在基座1上。
在第一抚平机构10包括第一旋转电机101、第二抚平机构6包括第二旋转电机的情况下，第一旋转电机101和第二旋转电机分别固定在基座1上。在基座1包括底座14和容置部15的情况下，第一旋转电机101和第二旋转电机固定在容置部15内，有利于提高投影屏幕的美观性。
在第一抚平机构10包括第一抚平杆102、第二抚平机构6包括第二抚平杆的情况下，幕布4收起时，第一抚平杆102和第二抚平杆收起在容置部15内。幕布4展开时，第一抚平杆102由幕布4的第二侧边44旋转至幕布4靠近第三侧边45的第一部分，第二抚平杆由幕布4的第二侧边44旋转至幕布4靠近第四侧边46的第二部分，以实现幕布4第三侧边45和第四侧边46的约束。
在一些实施例中，在升降机构3包括升降架37和横梁32，升降架37包括第一子升降架31的情况下，如图21和图22所示，第一抚平机构10、第二抚平机构6固定在横梁32上。
在第一抚平机构10包括第一旋转电机101、第二抚平机构6包括第二旋转电机的情况下，第一旋转电机101和第二旋转电机固定在横梁32上。
在一些实施例中，投影屏幕还包括边框9。如图21和图22所示，边框9包括边框本体91和两个侧壁92。边框本体91设置于横梁32上，两个侧壁92分别与边框本体91相连，且位于幕布4的正面和背面。边框9罩设在横梁32、幕布4的第一侧边43、第一旋转电机101和第二旋转电机的顶部，以通过边框9遮挡第一旋转电机101和第二旋转电机，从而保证投影屏幕的美观性。
幕布4收起时，第一抚平杆102、第二抚平杆收起在边框9的两个侧壁92之间，从而提高投影屏幕的美观性。
在一些实施例中，如图21至图24所示，当第一抚平机构5和第二抚平机构6位于幕布4的正面时，在第一子升降架31为折叠式升降架的情况下，幕布4展开后靠近第三侧边45的第五部分夹持在第一子升降架31和第一抚平机构5之间，幕布4展开后靠近第四侧边46的第六部分夹持在第一子升降架31和第二抚平机构6之间。
例如，在第一子升降架31包括第一折叠杆311和第二折叠杆312的情况下，当第一抚平机构10和第二抚平机构6位于幕布4的正面时，通过第一折叠杆311和第一抚平杆102即可实现对幕布4靠近第三侧边45的第五部分的夹持效果，通过第二折叠杆312和第二抚平杆即可实现对幕布4靠近第四侧边46的第六部分的夹持效果，从而有利于保证对幕布4的第三侧边45和第四侧边46的约束效果。
第一抚平机构10和第二抚平机构6位于幕布4的背面时，在升降机构3还包括第二子升降架33的情况下，第二子升降架33位于幕布4的正面，幕布4展开后靠近第三侧边45的第五部分夹持在第二子升降架33和第一抚平机构10之间，幕布4展开后靠近第三侧边45的第六部分夹持在第二子升降架33和第二抚平机构6之间。
例如，在第二子升降架33包括第三折叠杆331和第四折叠杆332的情况下，通过第三折叠杆331和第一抚平杆102即可实现对幕布4靠近第三侧边45的第五部分的夹持效果，通过第四折叠杆332和第二抚平杆即可实现对幕布4靠近第四侧边46的第六部分的夹持效果，从而有利于保证对幕布4的第三侧边45和第四侧边46的约束效果。
在一些实施例中，除了通过折叠式的第一子升降架31或者折叠式的第二子升降架实现对幕布4的第三侧边45和第四侧边46的约束之外，还可以通过其他方式 保证对幕布4的第三侧边45和第四侧边46的约束效果。
例如，在投影屏幕包括压紧机构5的情况下，压紧机构5位于幕布4远离第一抚平机构10的一侧。这样，通过调整压紧机构5的位置，使压紧机构5压紧在幕布4上，促使幕布4紧贴第一抚平机构10和第二抚平机构6，也即是促使幕布4紧贴第一抚平杆102和第二抚平杆，以保证第一抚平杆102、第二抚平杆对幕布4的第一侧边43和第二侧边44的约束效果。
当第一抚平机构10和第二抚平机构6位于幕布4的正面时，压紧机构5位于幕布4的背面；当第一抚平机构10和第二抚平机构6位于幕布4的背面时，压紧机构5位于幕布4的正面。
在一些实施例中，如图27和图28所示，升降机构3还包括第三抚平机构7和第四抚平机构8，第三抚平机构7、第四抚平机构8与幕布4接触，幕布4展开时，第三抚平机构7旋转至幕布4靠近第三侧边45的第一部分，第四抚平机构8旋转至幕布4靠近第四侧边46的第二部分，第一抚平机构10、第二抚平机构6固定在横梁32上，第三抚平机构7、第四抚平机构8固定在基座1上。
第三抚平机构7和第四抚平机构8的结构与第一抚平机构10的结构类似，第三抚平机构7和第四抚平机构8对幕布4的靠近第三侧边45的约束、与第一抚平机构10对幕布4靠近第三侧边45的约束类似，在此不再赘述。
第一抚平杆102的长度与第三抚平杆的长度之和等于幕布4的第三侧边45的长度，从而保证第一抚平杆102和第三抚平杆能够对幕布4的第三侧边45的有效约束。
当然，在一些实施例中，第一抚平杆102的长度与第三抚平杆的长度之和也可小于幕布4的第三侧边45的长度，只要能够保证幕布4展开后显示区域的平整度即可。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以所述权利要求的保护范围为准。

Claims (20)

  1. 一种投影装置，包括：
    投影屏幕，所述投影屏幕被配置为显示投影画面，且所述投影屏幕包括：
    基座；
    升降机构，所述升降机构设置在所述基座上；
    幕布，所述幕布的第一侧边与所述升降机构连接；和
    卷曲机构，所述卷曲机构设置在所述基座上，且所述卷曲机构与所述幕布的第二侧边连接，所述升降机构与所述幕布的第三侧边和第四侧边连接；和
    光学引擎，所述光学引擎被配置为将光束出射至所述投影屏幕。
  2. 根据权利要求1所述的投影装置，其中，所述升降机构包括：
    升降架，所述升降架设置在所述基座上，且所述升降架位于所述幕布远离和/或靠近所述光学引擎的一侧，所述升降架与所述第三侧边和所述第四侧边连接；和
    横梁，所述横梁与所述升降架连接，所述第一侧边与所述横梁连接。
  3. 根据权利要求2所述的投影装置，其中，所述升降架包括：
    第一折叠杆，所述第一折叠杆的两端分别与所述基座、所述横梁连接，所述第一折叠杆沿平行于所述第三侧边的方向设置；和
    第二折叠杆，所述第二折叠杆的两端分别与所述基座、所述横梁连接，所述第二折叠杆沿平行于所述第四侧边的方向设置。
  4. 根据权利要求2所述的投影装置，其中，所述升降架和所述幕布中的一个包括金属件，且所述升降架和所述幕布中的另一个包括与所述金属件相吸合的磁性件。
  5. 根据权利要求2所述的投影装置，其中，所述升降机构还包括：
    拉紧件，所述拉紧件的两端分别与所述卷曲机构、所述横梁连接，所述拉紧件位于所述幕布远离和/或靠近所述光学引擎的一侧，所述第三侧边和所述第四侧边与所述拉紧件连接。
  6. 根据权利要求5所述的投影装置，其中，
    所述拉紧件位于所述幕布远离所述光学引擎的一侧，且所述拉紧件的面积与所述幕布的面积大致相等；或者，
    所述拉紧件包括多个子拉紧件，所述多个子拉紧件位于所述幕布远离和/或靠近所述光学引擎的一侧，所述多个子拉紧件被构造成带状结构，所述多个子拉紧件中的一些与所述第三侧边连接，且所述多个子拉紧件中的一些与所述第四侧边连接。
  7. 根据权利要求5所述的投影装置，其中，所述投影屏幕还包括：
    压紧机构，所述压紧机构设置在所述基座上，且所述压紧机构被配置为将所述拉紧件压紧在所述幕布上，在垂直于所述幕布所在的平面的方向上，所述压紧机构可移动。
  8. 根据权利要求7所述的投影装置，其中，所述基座包括：
    基座本体；
    凸起，所述凸起设置于所述基座本体上；和
    导轨，所述导轨设置于所述基座本体上，且所述导轨的长度方向垂直于所述幕布所在的平面；
    所述压紧机构包括：
    滑块，所述滑块与所述导轨可滑动连接；
    调节螺杆，所述调节螺杆分别与所述滑块、所述凸起连接，且所述调节螺杆被配置为调整所述滑块与所述凸起之间的距离；和
    压紧辊，所述压紧辊的端部与所述滑块连接，所述压紧辊与所述拉紧件接触。
  9. 根据权利要求2所述的投影装置，其中，所述升降机构包括：
    第一抚平机构，所述第一抚平机构与所述幕布接触，且所述第一抚平机构被配置为从所述第一侧边或所述第二侧边旋转至所述幕布的靠近所述第三侧边的部分，所述幕布的靠近所述第三侧边的所述部分夹持在所述升降架和所述第一抚平机构之间；和
    第二抚平机构，所述第二抚平机构与所述幕布接触，且所述第二抚平机构被配置为从所述第一侧边或所述第二侧边旋转至所述幕布的靠近所述第四侧边的部分，所述幕布的靠 近所述第四侧边的所述部分夹持在所述升降架和所述第二抚平机构之间。
  10. 根据权利要求9所述的投影装置，其中，所述第一抚平机构和所述第二抚平机构设置在所述基座上。
  11. 根据权利要求9所述的投影装置，其中，所述第一抚平机构和所述第二抚平机构与所述横梁连接。
  12. 根据权利要求9所述的投影装置，其中，所述第一抚平机构或所述第二抚平机构的长度等于所述第三侧边或所述第四侧边的长度。
  13. 根据权利要求9所述的投影装置，其中，所述升降机构还包括：
    第三抚平机构，所述第三抚平机构与所述幕布接触，且所述第三抚平机构被配置为从所述第一侧边旋转至所述幕布的靠近所述第三侧边的部分；和
    第四抚平机构，所述第四抚平机构与所述幕布接触，且所述第四抚平机构被配置为从所述第一侧边旋转至所述幕布的靠近所述第四侧边的部分；其中，
    所述第一抚平机构、所述第二抚平机构设置在所述基座上，所述第三抚平机构、第四抚平机构与所述横梁连接。
  14. 根据权利要求13所述的投影装置，其中，所述第一抚平机构和所述第三抚平机构的长度之和等于所述第三侧边的长度；
    所述第二抚平机构和所述第四抚平机构的长度之和等于所述第四侧边的长度。
  15. 根据权利要求1或2所述的投影装置，其中，所述升降机构包括：
    第一抚平机构，所述第一抚平机构与所述幕布接触，且所述第一抚平机构被配置为从所述第一侧边或所述第二侧边旋转至所述幕布的靠近所述第三侧边的部分；和
    第二抚平机构，所述第二抚平机构与所述幕布接触，且所述第二抚平机构被配置为从所述第一侧边或所述第二侧边旋转至所述幕布的靠近所述第四侧边的部分。
  16. 根据权利要求15所述的投影装置，其中，所述第一抚平机构包括：
    第一抚平杆，所述第一抚平杆与所述幕布接触；和
    第一旋转电机，所述第一旋转电机的输出轴与所述第一抚平杆连接，且所述第一旋转电机被配置为驱动所述第一抚平杆从所述第一侧边或所述第二侧边旋转至所述幕布的靠近所述第三侧边的所述部分。
  17. 根据权利要求16所述的投影装置，其中，
    所述第一抚平杆和所述幕布中的一个包括金属件，且所述第一抚平杆和所述幕布中的另一个包括与所述金属件相吸合的磁性件。
  18. 根据权利要求16所述的投影装置，其中，所述第一抚平杆的长度等于所述第三侧边的长度。
  19. 根据权利要求15所述的投影装置，其中，所述第一抚平机构和所述第二抚平机构设置于所述幕布靠近所述光学引擎的一侧。
  20. 一种投影屏幕，包括：
    基座；
    升降机构，所述升降机构设置在所述基座上；
    幕布，所述幕布的第一侧边与所述升降机构连接；和
    卷曲机构，所述卷曲机构设置在所述基座上，所述卷曲机构与所述幕布的第二侧边连接，所述升降机构与所述幕布的第三侧边和第四侧边连接。
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