Projection equipment

Abstract

The embodiment of the present application discloses a projection device, which belongs to the field of projection technology. The projection device includes: an optical engine, a projection screen, the projection screen includes a base, a curling component, a lifting component, a screen piece, an adjustment knob, an adjustment component and a fixed rod, and the lifting component includes a lifting frame and a crossbeam; the first end of the lifting frame is rotatably connected to the base, and the second end of the lifting frame is rotatably connected to the crossbeam; the adjustment knob is rotatably limited on the crossbeam, the adjustment component is fixed on the crossbeam, the adjustment knob is connected to the adjustment component, the fixed rod is connected to the adjustment component, and the adjustment knob can adjust the position of the fixed rod in the width direction of the crossbeam through the adjustment component; the second side of the screen piece is fixedly connected to the fixed rod. In the embodiment of the present application, when the screen piece is tilted, the position of the fixed rod in the width direction of the crossbeam can be adjusted based on the adjustment knob to adjust the inclination angle of the screen piece, thereby avoiding the distortion, blurring and distortion of the picture displayed on the screen piece.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of projection technology, and in particular to a projection device. Background Art

[0002] With the continuous development of science and technology, projection equipment is increasingly used in people's work and life. At present, projection equipment mainly includes an optical engine and a projection screen. Among them, the light outlet side of the optical engine faces the projection screen to emit a light beam to the projection screen, and the projection screen is used to receive the light beam and display the picture.

[0003] In related technologies, such as Figure 1 As shown, the projection screen 1 includes a screen 11, a rolling assembly 12, a lifting assembly 13 and a base 14. The rolling assembly 12 and the lifting assembly 13 are fixed on the base 14, the first side of the screen 11 is fixedly connected to the rolling assembly 12, and the second side of the screen 11 is fixedly connected to the lifting assembly 13. The first side is opposite to the second side, the rolling assembly 12 can control the rolling of the screen 11, and the lifting assembly 13 can control the unfolding of the screen 11 to receive the light beam emitted by the optical engine.

[0004] Among them, the lifting assembly 13 includes multiple groups of lifting frames 131 and beams 132, each group of lifting frames 131 includes a first support rod 1311 and a second support rod 1312, and the three movable joints between the first end of the first support rod 1311 and the base 14, between the second end of the first support rod 1311 and the first end of the second support rod 1312, and between the second end of the second support rod 1312 and the beam 132 can be rotatably connected, and the second side of the curtain piece 11 is fixedly connected to the beam 13.

[0005] However, since assembly gaps are reserved at the three movable joints, when the lifting assembly 13 is lifted to unfold the screen 11, the lifting assembly 13 is easily tilted due to the assembly gaps reserved at the three movable joints under the reverse force of the screen 11. In addition, the three movable joints are prone to wear, which further aggravates the tilt of the lifting assembly 13. In this way, after the lifting assembly 13 tilts, the screen 11 will also tilt, which will cause the picture displayed on the screen 11 to be distorted, blurred, and distorted, thereby affecting the display effect of the projection screen 1. Summary of the invention

[0006] The embodiment of the present application provides a projection device, which can prevent the projection screen in the projection device from tilting. The technical solution is as follows:

[0007] A projection device, comprising:

[0008] An optical engine, the optical engine being used for emitting a light beam;

[0009] A projection screen, the projection screen comprising a base, a curling assembly, a lifting assembly, a screen piece, an adjustment knob, an adjustment assembly and a fixing rod, the lifting assembly comprising a lifting frame and a crossbeam;

[0010] The curling assembly is fixed on the base, the first end of the lifting frame is rotatably connected to the base, the second end of the lifting frame is rotatably connected to the beam, and the lifting frame can control the beam to rise;

[0011] The adjusting knob is rotatably limited on the crossbeam, the adjusting assembly is fixed on the crossbeam, the adjusting knob is connected to the adjusting assembly, the fixing rod is connected to the adjusting assembly, and the adjusting knob can adjust the position of the fixing rod in the width direction of the crossbeam through the adjusting assembly;

[0012] The first side of the curtain piece is fixedly connected to the curling assembly, the second side of the curtain piece is fixedly connected to the fixing rod, the first side is opposite to the second side, the curling assembly can control the curling of the curtain piece, and when the crossbeam is raised, the curtain piece can be driven to unfold through the fixing rod to receive the light beam.

[0013] Optionally, the adjustment assembly includes a base, a worm gear and a worm;

[0014] The worm wheel is rotatably limited along the axial direction at the first end of the fixing rod;

[0015] The base is fixed on the crossbeam, the worm is rotatably limited on the base, and the length direction of the worm is perpendicular to the length direction of the crossbeam;

[0016] The worm is meshed with the worm wheel, and the worm is connected to the adjusting knob, and the adjusting knob can drive the worm to rotate along its own circumferential direction.

[0017] Optionally, the centerline direction of the adjusting knob is colinear with the length direction of the worm, and the adjusting knob is fixedly connected to the end of the worm.

[0018] Optionally, the centerline direction of the adjusting knob is not colinear with the length direction of the worm;

[0019] The adjustment assembly also includes a first gear and a second gear, the first gear is fixedly connected to the adjustment knob along the axial direction, the second gear is fixedly connected to the end of the worm along the axial direction, and the first gear is meshed with the second gear.

[0020] Optionally, the centerline direction of the adjusting knob is parallel to the length direction of the worm, and the first gear and the second gear are both cylindrical gears.

[0021] Optionally, the centerline direction of the adjusting knob is perpendicular to the length direction of the worm, and the first gear and the second gear are both bevel gears.

[0022] Optionally, the adjustment assembly further includes a limit plate, which is fixed on the cross beam and can limit the turbine in the direction of its center line.

[0023] Optionally, the adjustment assembly further includes a third gear and a rack;

[0024] The third gear is rotatably limited along the axial direction at the second end of the fixing rod, the rack is fixed on the crossbeam, the length direction of the rack is perpendicular to the length direction of the crossbeam, and the third gear is meshed with the rack.

[0025] Optionally, the adjustment assembly, the adjustment knob and the fixing rod are all located on a side of the beam close to the base.

[0026] Optionally, the lifting assembly further comprises a first shell, wherein the first shell has a first opening and a second opening;

[0027] The first shell is fixed on the crossbeam, the adjustment assembly, the adjustment knob and the fixing rod are located in the first shell, the adjustment knob protrudes out of the first opening, and the second side edge of the curtain piece passes through the second opening and is fixedly connected to the fixing rod.

[0028] Optionally, the projection device further comprises a storage portion, wherein the storage portion comprises a first accommodating portion and a second accommodating portion;

[0029] The optical engine is located in the inner cavity of the first accommodating portion, the first accommodating portion has a light-transmitting area, and the light beam emitted by the optical engine can pass through the light-transmitting area;

[0030] The base, the curling assembly and the lifting assembly are fixed in the inner cavity of the second accommodating portion. The second accommodating portion has a third opening. The curling assembly can control the curtain piece to pass through the third opening and be accommodated in the inner cavity of the second accommodating portion. The lifting assembly can control the curtain piece to pass through the third opening and unfold.

[0031] The beneficial effects of the technical solution provided by the embodiments of the present application may at least include:

[0032] In the embodiment of the present application, when the projection device is not in use, the screen can be rolled up by the curling assembly, thereby reducing the overall appearance size of the projection device; when the projection device is in use, the crossbeam can be raised by the lifting frame, and then the screen can be unfolded by the fixing rod, so that the screen receives the light beam emitted by the optical engine to realize the display of the picture, thereby ensuring the normal use of the projection device. In addition, after the screen is unfolded, when the screen is tilted, the position of the fixing rod in the width direction of the crossbeam can be adjusted based on the adjustment knob, that is, the position of the second side of the screen in the width direction of the crossbeam can be adjusted to realize the adjustment of the inclination angle of the screen, thereby avoiding the picture displayed on the screen from being distorted, blurred, and distorted, thereby improving the projection effect of the projection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is a partially enlarged structural schematic diagram of a projection screen provided by the related art;

[0035] Figure 2 It is a side view structural schematic diagram of a projection screen provided by the related art;

[0036] Figure 3 It is a side view structural schematic diagram of another projection screen provided by the related art;

[0037] Figure 4 is a structural schematic diagram of a projection device provided in an embodiment of the present application;

[0038] Figure 5 is a schematic diagram of a rear view structure of a projection device provided in an embodiment of the present application;

[0039] Figure 6 is a schematic diagram of a partial structure of a projection screen provided in an embodiment of the present application;

[0040] Figure 7 is a partial structural schematic diagram of another projection screen provided in an embodiment of the present application;

[0041] Figure 8 It is a structural schematic diagram of a fixed rod movement provided in an embodiment of the present application;

[0042] Fig. 9 It is a schematic diagram of an exploded structure of an adjustment component provided in an embodiment of the present application;

[0043] Fig.10 It is a side structural schematic diagram of an adjustment component provided in an embodiment of the present application.

[0044] Reference numerals:

[0045] Related technologies:

[0046] 1: projection screen; 11: screen; 12: curling assembly; 13: lifting assembly; 14: base;

[0047] 131: lifting frame; 132: beam;

[0048] 1311: first support rod; 1312: second support rod; 1313: connecting shaft;

[0049] Embodiments of the present application:

[0050] 1: Optical engine; 2: Projection screen; 3: Storage unit;

[0051] 21: base; 22: curling assembly; 23: lifting assembly; 24: curtain piece; 25: adjustment knob; 26: adjustment assembly; 27: fixing rod;

[0052] 231: lifting frame; 232: beam; 233: first shell;

[0053] 261: base; 262: lead screw; 263: adjusting nut; 264: bushing; 265: guide shaft; 266: guide hole;

[0054] 31: first accommodating portion; 32: second accommodating portion. DETAILED DESCRIPTION

[0055] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0056] In the related art, the lifting assembly 13 includes multiple lifting frames 131, such as Figure 1 As shown, each lifting frame 131 further includes a connecting shaft 1313; the second end of the first support rod 1311 is provided with a first connecting groove, the first end of the second support rod 1312 extends into the first connecting groove, and the second end of the first support rod 1311 and the first end of the second support rod 1312 are rotatably connected through the connecting shaft 1313. The two groove walls of the first connecting groove and the side wall of the first end of the second support rod 1312 are both provided with connecting holes, and the connecting shaft 1313 passes through the connecting holes on the two groove walls and the connecting holes on the second support rod 1312, so as to realize the rotatable connection between the first support rod 1311 and the second support rod 1312.

[0057] Usually, an assembly gap is provided between the hole wall of the connection hole on the groove wall and the connection shaft 1313. For example, the gap between the hole wall of the connection hole on the groove wall and the connection shaft 1313 is less than or equal to 0.2 mm. In this way, the second support rod 1312 is easily tilted under the action of external force, causing the relative position relationship between the second end of the first support rod 1311 and the first end of the second support rod 1312 to change, and at the same time causing the straight line where the center points of the two connection holes on the first connection groove are located to form an angle with the axial direction of the connection shaft 1313. Furthermore, after the second support rod 1312 tilts, the curtain piece 11 will also tilt forward or backward.

[0058] The inclination angle of the second support rod 1312 is equal to the angle between the straight line where the center points of the two connection holes on the first connection groove are located and the axial direction of the connection shaft 1313. The maximum angle between the straight line where the center points of the two connection holes on the first connection groove are located and the axial direction of the connection shaft 1313 is calculated according to the following formula:

[0059] α=tan -1 D / B

[0060] Among them, α is the maximum angle between the straight line where the center points of the two connecting holes on the first connecting groove are located and the axial direction of the connecting shaft 1313, D is the gap between the hole wall of the connecting hole and the connecting shaft 1313, and B is the distance between the two groove walls of the first connecting groove.

[0061] It should be noted that, since the position of the curling assembly 12 is fixed, the position of the side of the curtain piece 11 connected to the curling assembly 12 will not change. Figure 2 As shown, the second support rods 1312 included in the multiple lifting frames 131 may all tilt away from the screen piece 11, so that one side of the screen piece 11 connected to the multiple lifting frames 131 will tilt backward, thereby causing the screen piece 11 to tilt backward; Figure 3 As shown, the second support rods 1312 included in the multiple lifting frames 131 may also tilt close to the screen piece 11, so that one side of the screen piece 11 connected to the multiple lifting frames 131 will tilt forward, thereby causing the screen piece 11 to tilt forward.

[0062] It should also be noted that the contact areas between the first support rod 1311 and the connecting shaft 1313, the first support rod 1311 and the second support rod 1312, and the second support rod 1312 and the connecting shaft 1313 are all prone to wear, thereby further aggravating the degree of forward or backward tilt of the screen.

[0063] Based on the above description, in the related art, there is a problem that the screen 11 included in the projection screen 1 is prone to tilt forward or backward, which causes the screen 11 to be unable to normally receive the light beam emitted by the optical engine, resulting in distortion, blurring and other problems in the displayed image.

[0064] Next, the implementation methods of the present application will be described in further detail with reference to the accompanying drawings.

[0065] like Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the projection device includes: an optical engine 1 and a projection screen 2, the projection screen 2 includes a base 21, a curling assembly 22, a lifting assembly 23, a screen piece 24, an adjustment knob 25, an adjustment assembly 26 and a fixing rod 27, and the lifting assembly 23 includes a lifting frame 231 and a beam 232.

[0066] The optical engine 1 is used for emitting a light beam; the curling assembly 22 is fixed on the base 21, the first end of the lifting frame 231 is rotatably connected to the base 21, the second end of the lifting frame 231 is rotatably connected to the beam 232, and the lifting frame 231 can control the beam 232 to rise; the adjusting knob 25 is rotatably limited on the beam 232, the adjusting assembly 26 is fixed on the beam 232, the adjusting knob 25 is connected to the adjusting assembly 26, the fixing rod 27 is connected to the adjusting assembly 26, and the adjusting knob 25 can adjust the position of the fixing rod 27 in the width direction of the beam 232 through the adjusting assembly 26; the first side of the curtain piece 24 is fixedly connected to the curling assembly 22, the second side of the curtain piece 24 is fixedly connected to the fixing rod 27, the first side is opposite to the second side, the curling assembly 22 can control the curtain piece 24 to curl, and when the beam 232 rises, the curtain piece 24 can be driven to unfold through the fixing rod 27 to receive the light beam.

[0067] In the embodiment of the present application, when the projection device is not in use, the screen 24 can be rolled up by the curling assembly 22, thereby reducing the overall appearance size of the projection device; when the projection device is in use, the crossbeam 232 can be raised by the lifting frame 231, and then the screen 24 can be driven to unfold by the fixing rod 27, so that the screen 24 receives the light beam emitted by the optical engine 1 to realize the display of the picture, thereby ensuring the normal use of the projection device. In addition, after the screen 24 is unfolded, when the screen 24 is tilted, such as Figure 8 As shown, the position of the fixing rod 27 in the width direction of the beam 232 can be adjusted based on the adjustment knob 25, that is, the position of the second side of the screen piece 24 in the width direction of the beam 232 is adjusted to adjust the inclination angle of the screen piece 24, thereby avoiding the problem of distortion, blurring and distortion of the picture displayed on the screen piece 24, so as to improve the projection effect of the projection device.

[0068] In some embodiments, the adjustment assembly 26, the adjustment knob 25 and the fixing rod 27 are all located on one side of the beam 232 close to the base 21. That is, the adjustment assembly 26, the adjustment knob 25 and the fixing rod 27 are located on the lower side of the beam 232. Of course, in other embodiments, such as Figure 6 or Figure 7 As shown, the adjustment assembly 26, the adjustment knob 25 and the fixing rod 27 are located on the side of the beam 232 away from the base 21. That is, the adjustment assembly 26, the adjustment knob 25 and the fixing rod 27 are located on the upper side of the beam 232.

[0069] When the adjustment assembly 26, the adjustment knob 25 and the fixing rod 27 are located on the side of the cross beam 232 away from the base 21, in order to facilitate the connection between the second side edge of the curtain piece 24 and the fixing rod 27, the cross beam 232 has a fourth opening along the length direction, so that the second side edge of the curtain piece 24 passes through the fourth opening and is fixedly connected to the fixing rod 27.

[0070] The fourth opening has a certain width to ensure that when the position of the fixing rod 27 is adjusted, the edge of the fourth opening will not affect the movement of the curtain piece 24 .

[0071] In the embodiment of the present application, the length direction of the fixing rod 27 is parallel to the central axis of the curling assembly 22 to ensure that the first side and the second side of the curtain piece 24 are parallel, thereby ensuring the flatness of the curtain piece 24 after unfolding. The length direction of the fixing rod 27 is parallel to the length direction of the crossbeam 232, or there is a small angle between the length direction of the fixing rod 27 and the length direction of the crossbeam 232, as long as the inclination angle of the curtain piece 24 can be adjusted by the fixing rod 27, and the embodiment of the present application does not limit this.

[0072] The fixing rod 27 is a straight rod or a roller-type straight rod. When the fixing rod 27 is a roller-type straight rod, the fixing rod 27 includes a roller and a rotating shaft, the roller is rotatably sleeved on the rotating shaft, the second side of the curtain piece 24 is fixedly connected to the roller, and the rotating shaft is connected to the adjustment assembly 26.

[0073] In the embodiment of the present application, the projection device is an ultra-short-throw laser projection device, and accordingly, the optical engine 1 is an ultra-short-throw optical engine 1. In this way, the distance between the optical engine 1 and the projection screen 2 can be set to be shorter, thereby realizing a miniaturized design of the projection device. For example, the ultra-short-throw optical engine 1 is a DLP (Digital Light Procession) optical engine 1.

[0074] The optical engine 1 includes a light source system, an illumination system and a lens system. The light source system is connected to the illumination system, and the lens system is connected to the illumination system. The light source system and the illumination system are both electrically connected to the functional components included in the projection device, so as to complete the emission of the light beam under the cooperation of the functional components. When the optical engine 1 is an ultra-short-throw optical engine 1, the lens system is an ultra-short-throw projection lens.

[0075] Optionally, a solid-state laser of red, green and blue primary colors is used as a light source system, or a solid-state laser is used to excite a fluorescent substance as a light source system, or a solid-state laser is used in combination with an LED (Light-Emitting Diode) light source as a light source system. The three primary color light beams emitted by the light source system are integrated by the lens in the lighting system, and then irradiated to the surface of the DMD (Digital Micromirror Device) in the lighting system. After the DMD rotates and reflects the light beams, they are emitted to the projection screen 2 after passing through the lens system to form a colorful picture. DMD is a display chip containing many small reflectors that can be flipped quickly.

[0076] In the embodiment of the present application, the screen sheet 24 is an optical screen sheet 24, such as a rollable Fresnel optical screen, or a flexible black screen. Such an optical screen sheet 24 has a higher optical gain than a traditional screen, and can restore the brightness and contrast of the light beam as much as possible. Through the curling and stretching of the curling component 22 and the lifting component 23, a higher flatness can be achieved, so as to be suitable for ultra-short-focus projection imaging applications.

[0077] The structure of the curling assembly 22 may refer to the related art, as long as the curtain piece 24 can be curled and retracted, and the embodiment of the present application will not elaborate on this.

[0078] The lifting assembly 23 includes a lifting frame 231 , a crossbeam 232 and a control mechanism. The control mechanism is connected to the lifting frame 231 to control the lifting or lowering of the lifting frame 231 .

[0079] The control mechanism is an electric control mechanism or an elastic control mechanism. Figure 1 In addition to the structure shown, other structures can also be used. For example, the lifting frame 231 is a telescopic rod, one end of which is fixedly connected to the base 21, and the other end of which is fixedly connected to the crossbeam 232. At this time, the telescopic rod can be controlled to extend by a control mechanism to achieve the lifting of the crossbeam 232.

[0080] Alternatively, if Figure 5 As shown, the lifting assembly 23 also includes a first shell 233, and the first shell 233 has a first opening and a second opening; the first shell 233 is fixed on the crossbeam 232, and the adjustment assembly 26, the adjustment knob 25 and the fixing rod 27 are located in the first shell 233, the adjustment knob 25 protrudes from the first opening, and the second side of the curtain piece 24 passes through the second opening and is fixedly connected to the fixing rod 27.

[0081] In this way, the first housing 233 wraps the adjustment assembly 26, the adjustment knob 25 and the fixing rod 27, thereby ensuring the aesthetics of the projection screen 2. Since the adjustment knob 25 protrudes out of the first opening, the adjustment of the adjustment knob 25 will not be affected.

[0082] The first opening is located on a side of the first shell 233 away from the optical engine 1 to ensure the aesthetics of the first shell 233 .

[0083] When the adjustment assembly 26, the adjustment knob 25 and the fixing rod 27 are located at the lower side of the cross beam 232, the second opening is located on the side of the first shell 233 away from the cross beam 232. At this time, the second opening has a certain width to ensure that when the position of the fixing rod 27 is adjusted, the second opening will not affect the movement of the curtain piece 24.

[0084] When the adjustment assembly 26, the adjustment knob 25 and the fixing rod 27 are located on the upper side of the cross beam 232, the second opening is located on the side of the first housing 233 close to the cross beam 232, and the projection of the fourth opening on the first housing 233 is located in the area where the second opening is located, or coincides with the area where the second opening is located. In this way, when the fourth opening does not affect the movement of the screen piece 24, the second opening will certainly not affect the movement of the screen piece 24.

[0085] Optionally, the lifting assembly 23 further includes a second housing, the second housing has a fifth opening and a sixth opening; the second housing is fixed on the crossbeam 232, the adjustment assembly 26 and the adjustment knob 25 are located in the second housing, the adjustment knob 25 protrudes out of the fifth opening, and the end of the fixing rod 27 passes through the sixth opening and is connected to the adjustment assembly 26. In this way, the aesthetics of the projection screen 2 is ensured by the second housing wrapping the adjustment assembly 26 and the adjustment knob 25.

[0086] Since the adjusting knob 25 protrudes from the fifth opening, it will not affect the adjustment of the adjusting knob 25. The position of the fifth opening relative to the second housing is the same as the position of the first opening relative to the first housing 233. The sixth opening is an oblong hole, and the length direction of the oblong hole is parallel to the width direction of the crossbeam 232, so as to ensure that the sixth opening does not affect the movement of the fixing rod 27.

[0087] In the embodiment of the present application, the adjustment component 26 is an adjustment component 26 including a worm gear and a worm, or an adjustment component 26 including a lead screw 262. Of course, it can also be other adjustment components 26 as long as it can adjust the position of the fixing rod 27 in the width direction of the beam 232.

[0088] Next, the adjustment assembly 26 including the lead screw 262 will be described in detail.

[0089] like Fig. 9 or Fig.10As shown, the adjustment component 26 includes a base 261 and a screw 262; the base 261 is fixed on the beam 232, and the screw 262 is rotatably limited on the base 261, and the length direction of the screw 262 is perpendicular to the length direction of the beam 232; one end of the screw 262 is threadedly connected to the fixing rod 27, and the other end of the screw 262 is fixedly connected to the output shaft of the driving motor, and the adjustment knob 25 can drive the screw 262 to rotate.

[0090] In this way, when the adjusting knob 25 is turned, the lead screw 262 is driven to rotate. Since the lead screw 262 can only rotate along its own axial direction and does not move in the length direction, when the lead screw 262 rotates, the fixing rod 27 threadedly connected thereto is driven to move in the length direction of the lead screw 262. Since the length direction of the lead screw 262 is perpendicular to the length direction of the cross beam 232, the fixing rod 27 can be ensured to move in the width direction of the cross beam 232 to adjust the position of the fixing rod 27 in the width direction of the cross beam 232.

[0091] In some embodiments, the end of the fixing rod 27 has a threaded hole in a direction perpendicular to the axial direction, and one end of the lead screw 262 passes through the threaded hole and is threadedly connected to the fixing rod 27. In this way, the fixing rod 27 can be threadedly connected to the lead screw 262 based on the threaded hole it has.

[0092] Optionally, the adjustment assembly 26 further includes a guide shaft, and the end of the fixed rod 27 has a guide hole, the length direction of the guide hole is parallel to the length direction of the threaded hole, the guide shaft passes through the guide hole, the guide shaft is fixed on the base 261, and the length of the guide shaft is greater than the length of the guide hole. In this way, when the fixed rod 27 moves along the length direction of the lead screw 262, the guide shaft can play a guiding and limiting role to improve the stability of the movement of the fixed rod 27.

[0093] In other embodiments, Fig. 9 or Fig.10 As shown, the adjustment assembly 26 further includes an adjustment nut 263, which is limited on the fixed rod 27, and one end of the lead screw 262 is threadedly connected to the adjustment nut 263. In this way, the fixed rod 27 can be threadedly connected to the lead screw 262 through the adjustment nut 263. In addition, for lead screws 262 of different specifications, the adjustment nuts 263 of different specifications are replaced, so that the fixed rod 27 can be used in conjunction with the lead screws 262 of different specifications.

[0094] Alternatively, if Fig. 9 or Fig.10 As shown, the adjustment assembly 26 also includes a sleeve 264, which is sleeved on the fixed rod 27, and the sleeve 264 is fixedly connected to the adjustment nut 263, and the center line of the sleeve 264 is perpendicular to the center line of the adjustment nut 263. In this way, the adjustment nut 263 can be connected to the fixed rod 27 based on the sleeve 264.

[0095] Among them, the sleeve 264 is fixedly connected to the first end of the fixing rod 27 to achieve smooth transmission of the force between the sleeve 264 and the fixing rod 27. Of course, the sleeve 264 can also be rotatably connected to the first end of the fixing rod 27, and the embodiment of the present application does not limit this.

[0096] Alternatively, if Fig. 9 As shown, the adjustment assembly 26 further includes a guide shaft 265, the side wall of the adjustment nut 263 has a protrusion, the protrusion has a guide hole 266, the guide shaft 265 passes through the guide hole 266, the guide shaft 265 is fixed on the base 261, and the length of the guide shaft 265 is greater than the length of the guide hole 266, and the length direction of the guide hole 266 is parallel to the center line direction of the adjustment nut 263. In this way, when the adjustment nut 263 moves along the length direction of the lead screw 262, the guide shaft 265 can play a guiding and limiting role to improve the stability of the movement of the adjustment nut 263, thereby improving the stability of the movement of the fixing rod 27.

[0097] In the embodiment of the present application, the center line direction of the adjustment knob 25 and the length direction of the lead screw 262 are collinear or non-collinear.

[0098] In some embodiments, the centerline direction of the adjusting knob 25 is colinear with the length direction of the lead screw 262, and the adjusting knob 25 is fixedly connected to the end of the lead screw 262. The connection between the adjusting knob 25 and the lead screw 262 is the same or similar to the connection between the adjusting knob 25 and the worm, and this embodiment of the application will not be described in detail.

[0099] In other embodiments, the centerline direction of the knob is not colinear with the length direction of the worm. In this case, the adjustment assembly 26 further includes a fourth gear and a fifth gear, the fourth gear is fixedly connected to the adjustment knob 25 along the axial direction, the fifth gear is fixedly connected to the end of the lead screw 262 along the axial direction, and the fourth gear is meshed with the fifth gear. In this way, when the adjustment knob 25 rotates, the fourth gear is driven to rotate, the fourth gear drives the fifth gear meshed therewith to rotate, and then the fifth gear drives the lead screw 262 to rotate together.

[0100] Among them, the connection method between the adjusting knob 25 and the fourth gear, and the lead screw 262 and the fifth gear is the same or similar to the connection method between the adjusting knob 25 and the lead screw 262 described above, and the embodiment of the present application does not limit this.

[0101] Optionally, the centerline direction of the adjusting knob 25 is parallel to the length direction of the lead screw 262. At this time, the fourth gear and the fifth gear are both cylindrical gears.

[0102] Since the fourth gear and the fifth gear are both cylindrical gears, the axial direction of the fourth gear is parallel to the axial direction of the fifth gear, so as to adapt to the situation that the center line direction of the adjustment knob 25 is parallel to the length direction of the worm.

[0103] For example, the fourth gear and the fifth gear are both spur gears, which have strong load-bearing capacity and are easy to process and produce. Alternatively, the fourth gear and the fifth gear are both helical gears, which have good gear meshing performance, relatively stable operation, and can ensure a more constant transmission ratio.

[0104] Optionally, the centerline direction of the adjusting knob 25 is perpendicular to the length direction of the worm. At this time, the fourth gear and the fifth gear are both bevel gears. In this way, the bevel gears can adapt to the situation where the centerline direction of the adjusting knob 25 is perpendicular to the length direction of the worm.

[0105] For example, the fourth gear and the fifth gear are both spur bevel gears, and their advantages are the same or similar to those of the spur cylindrical gears. Alternatively, the fourth gear and the fifth gear are both helical bevel gears, and their advantages are the same or similar to those of the helical cylindrical gears, which will not be described in detail in the present embodiment.

[0106] Next, the adjustment assembly 26 including the worm wheel and the worm will be described in detail.

[0107] In some embodiments, the adjustment assembly 26 includes a base 261, a worm wheel and a worm; the worm wheel is rotatably limited in the axial direction at the first end of the fixed rod 27; the base 261 is fixed on the beam 232, and the worm is rotatably limited on the base 261, and the length direction of the worm is perpendicular to the length direction of the beam 232; the worm is meshed with the worm wheel, and the worm is connected to the adjustment knob 25, and the adjustment knob 25 can drive the worm to rotate in its own circumferential direction.

[0108] In this way, when the adjustment knob 25 is rotated, the worm is driven to rotate, and then the worm is driven by the worm to drive the worm wheel meshing with it to roll along the length direction of the worm. Since the worm wheel is axially rotatable and limited at the first end of the fixed rod 27, the worm wheel can drive the fixed rod 27 to move along the length direction of the worm when rolling. Furthermore, since the length direction of the worm is perpendicular to the width direction of the beam 232, the position of the fixed rod 27 in the width direction of the beam 232 can be adjusted.

[0109] Optionally, the base 261 has two limiting sleeves, which are respectively sleeved on both sides of the spiral teeth of the worm, and the two limiting sleeves and the worm can rotate. In this way, the two limiting sleeves can support the worm and ensure that the worm rotates along its own circumferential direction. For example, lubricating oil is provided at the contact part between the worm and the limiting sleeve to ensure the flexibility of the worm when rotating.

[0110] It should be noted that the connection method between the turbine and the first end of the fixed rod 27 is based on the case where the fixed rod 27 is a straight rod. When the fixed rod 27 is a roller-type straight rod, the turbine is fixedly connected to the first end of the rotating shaft included in the fixed rod 27. In this way, when the turbine rolls along the length direction of the worm, the rotating shaft is driven to move along the length direction of the worm, thereby realizing the adjustment of the position of the roller-type straight rod in the width direction of the crossbeam 232.

[0111] In the embodiment of the present application, the center line direction of the adjustment knob 25 and the length direction of the worm are colinear or non-colinear.

[0112] In some embodiments, the centerline direction of the adjusting knob 25 is colinear with the length direction of the worm. At this time, the adjusting knob 25 is fixedly connected to the end of the worm. In this way, when the adjusting knob 25 rotates, it can directly drive the worm fixedly connected thereto to rotate together.

[0113] The adjusting knob 25 and the end of the worm are welded or threadedly connected.

[0114] In other embodiments, the centerline direction of the adjusting knob 25 is not colinear with the length direction of the worm. In this case, the adjusting assembly 26 further includes a first gear and a second gear, wherein the first gear is fixedly connected to the adjusting knob 25 along the axial direction, and the second gear is fixedly connected to the end of the worm along the axial direction, and the first gear meshes with the second gear. In this way, when the adjusting knob 25 rotates, the first gear is driven to rotate, and the first gear drives the second gear meshed therewith to rotate, and then the second gear drives the worm to rotate together.

[0115] Among them, the connection method between the adjusting knob 25 and the first gear, and the connection method between the worm and the second gear is the same or similar to the connection method between the adjusting knob 25 and the worm described above, and the embodiment of the present application does not limit this.

[0116] Optionally, the centerline direction of the adjusting knob 25 is parallel to the length direction of the worm. At this time, both the first gear and the second gear are cylindrical gears.

[0117] Since both the first gear and the second gear are cylindrical gears, the axial direction of the first gear is parallel to the axial direction of the second gear, so as to adapt to the situation that the center line direction of the adjustment knob 25 is parallel to the length direction of the worm.

[0118] For example, the first gear and the second gear are both spur gears, which have strong load-bearing capacity and are easy to process and produce. Alternatively, the first gear and the second gear are both helical gears, which have good gear meshing performance, relatively stable operation, and can ensure a more constant transmission ratio.

[0119] Optionally, the centerline direction of the adjusting knob 25 is perpendicular to the length direction of the worm. In this case, the first gear and the second gear are both bevel gears. In this way, the bevel gears can adapt to the situation where the centerline direction of the adjusting knob 25 is perpendicular to the length direction of the worm.

[0120] For example, the first gear and the second gear are both spur bevel gears, which have the same or similar advantages as the above-mentioned spur cylindrical gears. Alternatively, the first gear and the second gear are both helical bevel gears, which have the same or similar advantages as the above-mentioned helical cylindrical gears, and the embodiments of the present application will not be described in detail.

[0121] In the embodiment of the present application, the adjustment component 26 also includes a limit plate, which is fixed on the crossbeam 232. The limit plate can limit the fixing rod 27 in the direction of its own center line.

[0122] For example, both ends of the fixing rod 27 are provided with limiting plates, so that the fixing rod 27 can be prevented from moving in the length direction by limiting the limiting plates at both ends.

[0123] When the adjustment assembly 26 includes a lead screw 262, the side of the limit plate directly abuts against the end of the fixing rod 27. When the adjustment assembly 26 includes a turbine, the side of the limit plate abuts against the turbine. That is, the limit plate limits the turbine in the direction of its own center line.

[0124] When the side of the limiting plate directly abuts against the end of the fixing rod 27, the limiting plate has a limiting groove, the end of the fixing rod 27 is located in the limiting groove, and the fixing rod 27 can move in the limiting groove. In this way, not only can the limiting plate limit the length direction of the fixing rod 27, but also the limiting groove can guide the moving direction of the fixing rod 27. Among them, the length direction of the limiting groove is parallel to the width direction of the crossbeam 232.

[0125] In the embodiment of the present application, in order to ensure the stability of the fixed rod 27 when it moves, in some embodiments, the second end of the fixed rod 27 is also provided with an adjustment assembly 26. When the adjustment assembly 26 includes a worm and a worm wheel, the worm wheel is rotatably limited at the second end of the fixed rod 27 along the axial direction, and when the adjustment assembly 26 includes a lead screw 262, the lead screw 262 is threadedly connected to the second end of the fixed rod 27. In this way, both ends of the fixed rod 27 are provided with the adjustment assembly 26, so that the two ends of the fixed rod 27 can be controlled to move synchronously to ensure the stability of the overall movement of the fixed rod 27.

[0126] In other embodiments, the adjustment assembly 26 also includes a third gear and a rack. The third gear is axially rotatable and limited at the second end of the fixed rod 27. The rack is fixed on the beam 232. The length direction of the rack is perpendicular to the length direction of the beam 232. The third gear is meshed with the rack.

[0127] In this way, when the adjusting knob 25 drives the fixing rod 27 to move through the worm gear or the lead screw 262, the third gear is rotatably connected to the second end of the fixing rod 27, so that when the fixing rod 27 moves, the third gear is driven to roll along the length direction of the rack meshed therewith. Since the length direction of the rack is perpendicular to the length direction of the crossbeam 232, it is ensured that the third gear rolls along the length direction of the rack while generating a displacement along the width direction of the crossbeam 232. Furthermore, the third gear can guide the fixing rod 27, so that the second end of the fixing rod 27 generates a displacement along the width direction of the crossbeam 232 synchronously with the first end.

[0128] In some embodiments, Figure 4 As shown, the projection device further includes a storage portion 3, which has a first accommodating portion 31 and a second accommodating portion 32; the optical engine 1 is located in the inner cavity of the first accommodating portion 31, the first accommodating portion 31 has a light-transmitting area, and the light beam emitted by the optical engine 1 can pass through the light-transmitting area; the base 21, the curling assembly 22 and the lifting assembly 23 are fixed in the inner cavity of the second accommodating portion 32, the second accommodating portion 32 has a third opening, the curling assembly 22 can control the screen 24 to pass through the third opening and be accommodated in the inner cavity of the second accommodating portion 32, and the lifting assembly 23 can control the screen 24 to pass through the third opening and unfold. In this way, when the projection device is not in use, the optical engine 1 and the projection screen 2 are stored in the storage portion 3, which is convenient for saving space. When the projection device is in use, the lifting assembly 23 controls the screen 24 to unfold, and at the same time, the optical engine 1 projects a light beam onto the screen 24, so that the screen 24 displays an image. In addition, the storage portion 3 limits the position of the optical engine 1 and the projection screen 2, thereby preventing the optical engine 1 and the projection screen 2 from being displaced relative to each other.

[0129] The vertical distance from the center point of the light-transmitting area to the plane where the unfolded screen piece 24 is located is equal to the product of the projection ratio of the optical engine 1 and the width of the display area on the screen piece 24, and the width of the display area refers to the size of the display area in the horizontal direction. In this way, it can be ensured that the light beam emitted by the optical engine 1 can be accurately projected to the display area of ​​the screen piece 24, so as to ensure the clarity of the image displayed on the screen piece 24.

[0130] Since the projection ratio is a performance parameter of the optical engine 1 itself, the projection ratio of the optical engine 1 is related to the selected optical engine 1, that is, if a different optical engine 1 is selected, the projection ratio is different, and thus the vertical distance from the center point of the light-transmitting area to the plane where the unfolded screen piece 24 is located is also different. In this way, in the actual setting process, the vertical distance from the center point of the light-transmitting area to the plane where the unfolded screen piece 24 is located is calculated by the projection ratio of the optical engine 1 and the width of the display area, so as to ensure that the light beam emitted by the optical engine 1 can be completely projected on the display area of ​​the screen piece 24.

[0131] In the embodiment of the present application, when the projection device is not in use, the screen can be rolled up by the curling assembly, thereby reducing the overall appearance size of the projection device; when the projection device is in use, the crossbeam can be raised by the lifting frame, and then the screen can be unfolded by the fixing rod, so that the screen receives the light beam emitted by the optical engine to realize the display of the picture, thereby ensuring the normal use of the projection device. In addition, after the screen is unfolded, when the screen is tilted, the position of the fixing rod in the width direction of the crossbeam can be adjusted based on the adjustment knob, that is, the position of the second side of the screen in the width direction of the crossbeam can be adjusted to realize the adjustment of the inclination angle of the screen, thereby avoiding the picture displayed on the screen from being distorted, blurred, and distorted, thereby improving the projection effect of the projection device.

[0132] The above description is only an illustrative embodiment of the embodiments of the present application and is not intended to limit the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A projection device, characterized in that: The projection device comprises: An optical engine, the optical engine being used for emitting a light beam; A projection screen, the projection screen comprising a base, a curling assembly, a lifting assembly, a screen piece, an adjustment knob, an adjustment assembly and a fixing rod, the lifting assembly comprising a lifting frame and a crossbeam; The curling assembly is fixed on the base, the first end of the lifting frame is rotatably connected to the base, the second end of the lifting frame is rotatably connected to the beam, and the lifting frame can control the beam to rise; The adjusting knob is rotatably limited on the crossbeam, the adjusting assembly is fixed on the crossbeam, the adjusting knob is connected to the adjusting assembly, the fixing rod is connected to the adjusting assembly, and the adjusting knob can adjust the position of the fixing rod in the width direction of the crossbeam through the adjusting assembly; The first side of the curtain piece is fixedly connected to the curling assembly, the second side of the curtain piece is fixedly connected to the fixing rod, the first side is opposite to the second side, the curling assembly can control the curling of the curtain piece, and when the crossbeam is raised, the curtain piece can be driven to unfold through the fixing rod to receive the light beam.

2. The projection device according to claim 1, characterized in that: The adjustment assembly includes a base, a worm wheel and a worm; The worm wheel is rotatably limited along the axial direction at the first end of the fixing rod; The base is fixed on the crossbeam, the worm is rotatably limited on the base, and the length direction of the worm is perpendicular to the length direction of the crossbeam; The worm is meshed with the worm wheel, and the worm is connected to the adjusting knob, and the adjusting knob can drive the worm to rotate along its own circumferential direction.

3. The projection device according to claim 2, characterized in that: The centerline direction of the adjusting knob is colinear with the length direction of the worm, and the adjusting knob is fixedly connected to the end of the worm.

4. The projection device according to claim 2, characterized in that: The centerline direction of the adjusting knob is not colinear with the length direction of the worm; The adjustment assembly also includes a first gear and a second gear, the first gear is fixedly connected to the adjustment knob along the axial direction, the second gear is fixedly connected to the end of the worm along the axial direction, and the first gear is meshed with the second gear.

5. The projection device according to claim 4, characterized in that: The centerline direction of the adjusting knob is parallel to the length direction of the worm, and the first gear and the second gear are both cylindrical gears.

6. The projection device according to claim 4, characterized in that: The centerline direction of the adjusting knob is perpendicular to the length direction of the worm, and the first gear and the second gear are both bevel gears.

7. The projection device according to any one of claims 2 to 6, characterized in that: The adjustment component also includes a limit plate, which is fixed on the crossbeam and can limit the worm wheel in the direction of its own center line.

8. The projection device according to claim 7, characterized in that: The adjustment assembly also includes a third gear and a rack; The third gear is rotatably limited along the axial direction at the second end of the fixing rod, the rack is fixed on the crossbeam, the length direction of the rack is perpendicular to the length direction of the crossbeam, and the third gear is meshed with the rack.

9. The projection device according to claim 1, characterized in that: The adjusting assembly, the adjusting knob and the fixing rod are all located on one side of the crossbeam close to the base.

10. The projection device according to claim 1, characterized in that: The lifting assembly further includes a first housing having a first opening and a second opening; The first shell is fixed on the crossbeam, the adjustment assembly, the adjustment knob and the fixing rod are located in the first shell, the adjustment knob protrudes out of the first opening, and the second side edge of the curtain piece passes through the second opening and is fixedly connected to the fixing rod.

11. The projection device according to claim 1, characterized in that: The projection device further comprises a storage portion, wherein the storage portion comprises a first accommodating portion and a second accommodating portion; The optical engine is located in the inner cavity of the first accommodating portion, the first accommodating portion has a light-transmitting area, and the light beam emitted by the optical engine can pass through the light-transmitting area; The base, the curling assembly and the lifting assembly are fixed in the inner cavity of the second accommodating portion. The second accommodating portion has a third opening. The curling assembly can control the curtain piece to pass through the third opening and be accommodated in the inner cavity of the second accommodating portion. The lifting assembly can control the curtain piece to pass through the third opening and unfold.

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