Projection device

Abstract

An embodiment of the present application discloses a projection device, belonging to the field of projection technology. The projection device includes: an optical engine and a projection screen. The projection screen includes a base, a curling component, a lifting component, and a screen sheet. The lifting component includes a lifting frame, a hydraulic rod, and a cross beam; the first end of the lifting frame and the first end of the hydraulic rod are rotatably connected to the base, the second end of the lifting frame is rotatably connected to the cross beam, and the second end of the hydraulic rod is rotatably connected to the lifting frame; the two opposite sides of the screen sheet are fixedly connected to the curling component and the cross beam respectively. In the embodiment of the present application, through the setting of the hydraulic rod, elastic potential energy can be stored when the screen sheet is retracted, and the screen sheet can be deployed based on the stored elastic potential energy, thus avoiding the setting of an additional power supply system and control system, and reducing the structural complexity and control difficulty of the lifting component.

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 advancement of technology, projection equipment is increasingly being used in people's work and daily lives. Currently, projection equipment mainly consists of an optical engine and a projection screen. The projection screen includes a screen, a winding assembly, and a lifting assembly. Opposite sides of the screen are fixedly connected to the winding assembly and the lifting assembly, respectively, allowing the screen to be rolled up and unfolded under the coordinated control of the winding and lifting assemblies.

[0003] However, when the screen panels are deployed, the lifting assembly usually includes a drive motor, which requires an additional power supply and control system, thereby increasing the complexity of the lifting assembly and the difficulty of controlling the lifting and lowering of the screen panels. Summary of the Invention

[0004] The embodiment of the present application provides a projection device that can reduce the structural complexity and control difficulty of the lifting assembly included in the projection device. The technical solution is as follows:

[0005] A projection device, comprising:

[0006] an optical engine, the optical engine being used to emit a light beam;

[0007] A projection screen, comprising a base, a curling assembly, a lifting assembly, and a screen, wherein the lifting assembly comprises a lifting frame, a hydraulic rod, and a crossbeam;

[0008] The curling assembly is rotatably fixed to the base, the first end of the lifting frame and the first end of the hydraulic rod are both rotatably connected to the base, the second end of the lifting frame is rotatably connected to the crossbeam, and the second end of the hydraulic rod is rotatably connected to the lifting frame, and the hydraulic rod can cause the lifting frame to rise to drive the crossbeam to rise;

[0009] Two opposite sides of the screen are fixedly connected to the curling assembly and the crossbeam respectively. The curling assembly is used to control the curling of the screen. When the crossbeam rises, it drives the screen to unfold to receive the light beam.

[0010] Optionally, the lifting frame includes a first connecting rod and a second connecting rod;

[0011] The first end of the first connecting rod is rotatably connected to the base, the first end of the second connecting rod is rotatably connected to the beam, and the second end of the first connecting rod is rotatably connected to the second end of the second connecting rod.

[0012] Optionally, the second end of the hydraulic rod is rotatably connected to the first link.

[0013] Optionally, the second end of the hydraulic rod is rotatably connected to the second link.

[0014] Optionally, the curling assembly includes a reel, a curling motor, and a tension member;

[0015] The reel is rotatably fixed to the base, the curling motor is fixed to the base and is in transmission connection with the reel, one end of the tension member is fixedly connected to the reel, and the other end of the tension member is fixedly connected to the cross beam.

[0016] Optionally, the tension member is a flexible rope.

[0017] A projection device, the projection device includes:

[0018] An optical engine for emitting a light beam;

[0019] A projection screen, the projection screen includes a base, a screen sheet, a curling assembly, and a lifting assembly, the lifting assembly includes a plurality of hydraulic rods and a cross beam; [[ID=!23]]

[0020] The curling assembly is rotatably fixed to the base, the first end of each hydraulic rod is connected to the base, the second end of each hydraulic rod is connected to the cross beam, and the plurality of hydraulic rods can cause the cross beam to rise;

[0021] Two opposite sides of the screen sheet are respectively fixedly connected to the curling assembly and the cross beam, the curling assembly is used to control the curling of the screen sheet, and when the cross beam rises, it drives the screen sheet to unfold to receive the light beam.

[0022] Optionally, the plurality of hydraulic rods at least include a first hydraulic rod and a second hydraulic rod;

[0023] The first end of the first hydraulic rod and the first end of the second hydraulic rod are both fixed to the base, the second end of the first hydraulic rod and the second end of the second hydraulic rod are both fixedly connected to the cross beam, and the length direction of each hydraulic rod is perpendicular to the length direction of the cross beam.

[0024] Optionally, the plurality of hydraulic rods at least include a first hydraulic rod and a second hydraulic rod;

[0025] The first end of the first hydraulic rod and the first end of the second hydraulic rod are both rotatably connected to the base, and the second end of the first hydraulic rod and the second end of the second hydraulic rod are both rotatably connected to the cross beam.

[0026] Optionally, the lifting assembly further includes a telescopic rod. The first end of the telescopic rod is fixed to the base, and the second end of the telescopic rod is fixedly connected to the cross beam. The length direction of the telescopic rod is perpendicular to the length direction of the cross beam.

[0027] Optionally, the lifting assembly further includes a pulling rope. The first end of the pulling rope is fixed to the base, and the second end of the pulling rope is fixedly connected to the cross beam.

[0028] The beneficial effects of the technical solution provided by the embodiment of the present application at least include:

[0029] In the embodiment of the present application, through the setting of the hydraulic rod, elastic potential energy can be stored when the screen is retracted, and the screen can be unfolded based on the stored elastic potential energy, thereby avoiding the setting of an additional power supply system and control system, and reducing the structural complexity and control difficulty of the lifting assembly. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0031] Figure 1 is a schematic structural diagram of a projection device provided by an embodiment of the present application;

[0032] Figure 2 is a schematic structural diagram of an optical engine and a functional component provided by an embodiment of the present application; <B

[0033] Figure 3 is a schematic structural diagram of a curling assembly provided by an embodiment of the present application;

[0034] Figure 4 is a schematic side view structural diagram of a first support mechanism provided by an embodiment of the present application;

[0035] Figure 5 is a schematic front view structural diagram of a first support mechanism provided by an embodiment of the present application;

[0036] Figure 6 is a schematic structural diagram of a second support mechanism provided by an embodiment of the present application;

[0037] Figure 7 is a schematic structural diagram of a lifting assembly when the screen is unfolded provided by an embodiment of the present application;

[0038] Figure 8It is a schematic structural diagram of a lifting component when the screen is retracted provided by an embodiment of the present application.

[0039] Reference numerals:

[0040] 1: Optical engine; 2: Projection screen; 3: Functional component; 4: Storage part;

[0041] 11: Light source system; 12: Lighting system; 13: Lens system; 14: Heat dissipation component;

[0042] 21: Base; 22: Coiling component; 23: Lifting component; 24: Screen;

[0043] 221: Reel; 222: Coiling motor; 223: First support mechanism; 224: Second support mechanism;

[0044] 2231: First support frame; 2232: First guide wheel; 2241: Second support frame; 2242: Second

[0045] guide wheel;

[0046] 231: Lifting frame; 232: Hydraulic rod; 233: Cross beam;

[0047] 2311: First connecting rod; 2312: Second connecting rod;

[0048] 31: Power supply board; 32: Display board;

[0049] 41: First accommodating part; 42: Second accommodating part. Detailed implementation manners

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0051] Figure 1 It exemplifies a schematic structural diagram of a projection device according to an embodiment of the present application. As Figure 1 shown, the projection device includes: an optical engine 1, and the optical engine 1 is used to emit light beams; a projection screen 2, and the projection screen 2 includes a base 21, a coiling component 22, a lifting component 23, and a screen 24. The coiling component 22 is rotatably fixed on the base 21, the lifting component 23 is fixed on the base 21, and the two opposite sides of the screen 24 are respectively fixed to the coiling component 22 and the lifting component 23. The coiling component 22 and the lifting component 23 are used to cooperate to realize the coiling or unfolding of the screen 24, and the screen 24 receives the light beams emitted by the optical engine 1 when unfolded.

[0052] In the embodiments of the present application, the projection device is a laser ultra-short throw projection device. At this time, the optical engine 1 included in the laser ultra-short throw projection device is an ultra-short throw optical engine 1. For example, the ultra-short throw optical engine 1 is a DLP (Digital Light Procession) optical engine 1. Since the optical engine 1 is an ultra-short throw optical engine 1, in this way, the distance from the ultra-short throw optical engine 1 to the plane where the screen sheet 24 of the projection screen 2 is located can be set to a relatively short distance to achieve the miniaturized design of the laser projection device.

[0053] Among them, as Figure 2 shown, the specific structures of the light source system 11, the illumination system 12, and the lens system 13 included in the optical engine 1 can refer to the related technologies, and the embodiments of the present application do not limit this. For example, a red, green, and blue three-primary-color solid-state laser is used as the light source system 11, or a solid-state laser is used to excite a fluorescent substance as the light source system 11, or a solid-state laser is combined with an LED (Light-Emitting Diode) light source as the light source system 11. The three-primary-color light beams emitted by the light source system 11 are integrally processed by the lenses in the illumination system 12 and then irradiated onto the surface of the DMD (Digital Micromirror Device) in the illumination system 12. Then, the integrally processed light beams are rotationally reflected by the DMD to the lens system 13, and then diffused by the lens system 13 and emitted to the screen sheet 24 to form a colorful image on the screen sheet 24. Among them, the DMD is a display chip containing many small mirrors that can be quickly flipped.

[0054] In addition, as Figure 2 shown, the optical engine 1 further includes a heat dissipation component 14 to facilitate the heat dissipation of the light source system 11, the illumination system 12, and the lens system 13 through the heat dissipation component 14, and to prevent the heat accumulated inside the light source system 11, the illumination system 12, and the lens system 13 from causing the device temperature to be too high and affecting the optical performance of the device. For example, the heat dissipation component 14 includes a fan, a liquid cooling device, etc.

[0055] In the embodiments of the present application, as Figure 2 shown, the projection device includes a functional component 3. The functional component 3 is electrically connected to the optical engine 1. The functional component 3 is used to be electrically connected to an external power supply, and the optical engine 1 can emit light beams with the cooperation of the functional component 3.

[0056] Among them, as Figure 2As shown in the figure, the functional component 3 includes a power supply board 31, a display board 32, and a control main board (not shown in the figure); the power supply board 31 is respectively connected to the optical engine 1, the display board 32, and the control main board. The power supply board 31 is also used to connect to an external power supply. The display board 32 is electrically connected to the optical engine 1 and the control main board respectively. Combining the above explanation of the optical engine 1, the power supply board 31 is electrically connected to the light source system 11 in the optical engine 1, and the display board 32 is electrically connected to the DMD included in the illumination system 12 in the optical engine 1.

[0057] Among them, the power supply board 31 can output a voltage or current drive signal, thereby facilitating the power supply for devices such as the display board 32 and the light source system 11 in the optical engine 1 to ensure the normal use of the projection device. The control main board is a television (TV) main board. The plug-in end of the control main board is used to connect external devices such as a computer, a mobile phone, and a USB flash drive. The control main board is used to receive multimedia data transmitted by the external device, decode the multimedia data to obtain a video signal, and then transmit the decoded video signal to the display board 32. Then, the display board 32 converts the received video signal into a drive signal and transmits it to the DMD included in the illumination system 12 in the optical engine 1, so that the DMD board drives the micromirrors on the DMD to deflect based on the drive signal, thereby emitting a light beam from the DMD to the screen 24 to realize the display of the picture.

[0058] In the embodiment of the present application, the screen 24 included in the projection screen 2 is an optical screen 24, such as a rollable Fresnel optical screen or a flexible black grid screen. Such a screen 24 has a higher optical gain compared to the traditional screen 24, can restore the brightness and contrast of the light beam as much as possible, and can achieve a high flatness through the stretching of the curling mechanism and the lifting mechanism, so that the picture display effect of the screen 24 is better.

[0059] In the embodiment of the present application, as Figure 1 shown, the projection device further includes a storage part 4. The storage part 4 has a first accommodation part 41 and a second accommodation part 42. The optical engine 1 is fixed in the first accommodation part 41. The first accommodation part 41 has a light-transmitting area. The light beam emitted by the optical engine 1 passes through the light-transmitting area. The base 21 included in the projection screen 2 is fixed in the second accommodation part 42. The second accommodation part 42 has an opening. The lifting assembly 23 can control the screen 24 to pass through the opening and unfold. In this way, the optical engine 1 and the projection screen 2 can be respectively protected by the first accommodation part 41 and the second accommodation part 42 to avoid displacement or damage under the impact of foreign objects.

[0060] Optionally, the first accommodating portion 41 and the second accommodating portion 42 are integrally provided, so as to ensure the integration of the optical engine 1 and the projection screen 2, avoid the relative displacement between the optical engine 1 and the projection screen 2, and thus ensure that the projection screen 2 can safely receive the light beam emitted by the optical engine 1 to ensure the picture display effect of the screen sheet 24. Of course, the first accommodating portion 41 and the second accommodating portion 42 are separately provided, which is convenient for the separate handling of the optical engine 1 and the projection screen 2 and the separate maintenance during the later use process.

[0061] Next, the curling assembly 22 will be introduced in detail.

[0062] Figure 3 The structural schematic diagram of a curling assembly 22 according to an embodiment of the present application is illustrated. As Figure 3 shown, the curling assembly 22 includes a winding drum 221, a curling motor 222, a first support mechanism 223 and a second support mechanism 224; the curling motor 222, the first support mechanism 223 and the second support mechanism 224 are fixed on the base 21, the winding drum 221 is in transmission connection with the curling motor 222, the winding drum 221 is rotatably supported and limited on the first support mechanism 223 and the second support mechanism 224, and the first side edge of the screen sheet 24 is fixedly connected with the winding drum 221; the first support mechanism 223 and the second support mechanism 224 are used to adjust the height of the winding drum 221, and the curling motor 222 can drive the winding drum 221 to rotate to curl the screen sheet 24.

[0063] In the embodiment of the present application, through the support and limitation of the winding drum 221 by the first support mechanism 223 and the second support structure, compared with being fixed by a rotating shaft, the problem that the weight of the winding drum 221 and the tension of the screen sheet 24 act on the rotating shaft, causing the rotating shaft to be easily damaged, is avoided, thereby prolonging the service life of the curling assembly 22, that is, prolonging the service life of the projection device. In addition, the height of the winding drum 221 can also be adjusted by the first support mechanism 223 and the second support mechanism 224. In this way, compared with the winding drum 221 being fixed to the base 21 by a rotating shaft, the flexibility of the position of the winding drum 221 is improved.

[0064] In the embodiment of the present application, the curling motor 222 is in transmission connection with the first end of the winding drum 221, the first support mechanism 223 is used to support the first end of the winding drum 221, the second support mechanism 224 is used to support the second end of the winding drum 221, and the first support mechanism 223 is used to adjust the height of the first end of the winding drum 221, and the second support mechanism 224 is used to adjust the height of the second end of the winding drum 221.

[0065] In some embodiments, such as Figure 4 or Figure 5As shown in the figure, the first support mechanism 223 includes a first support frame 2231 and a plurality of first guide wheels 2232; the first support frame 2231 is fixed on the base 21, and the plurality of first guide wheels 2232 are fixed on the first support frame 2231. The first end of the winding drum 221 is rotatably limited on the plurality of first guide wheels 2232, and the positions of the plurality of first guide wheels 2232 are adjustable.

[0066] In this way, by adjusting the positions of the plurality of first guide wheels, the height of the winding drum 221 can be adjusted to ensure the flexibility of the height of the first end of the winding drum 221. In addition, while limiting the winding drum 221 by the plurality of first guide wheels, the plurality of first guide wheels 2232 can also support the first end of the winding drum 221.

[0067] Among them, the sizes of the plurality of first guide wheels 2232 are the same or different, as long as they can limit the winding drum 221 and support the winding drum 221 at the same time. The embodiments of the present application do not make any limitations in this regard. The plurality of first guide wheels 2232 are all metal guide wheels. Of course, the plurality of first guide wheels 2232 can also be all plastic guide wheels, so that the wear generated during the rotation of the winding drum 221 can be reduced through the plastic guide wheels.

[0068] Among them, the material of the plastic guide wheel is a plastic with self-lubricating effect such as POM plastic, so that the maintenance of the curling assembly 22 during the use of the projection device can be avoided, thus facilitating the use of the user.

[0069] Optionally, the height of the first support frame 2231 is adjustable, so that the height of the plurality of first guide wheels 2232 can be adjusted by adjusting the height of the first support frame 2231, that is, the positions of the plurality of first guide wheels 2232 are adjusted, and then the height of the first end of the winding drum 221 is adjusted.

[0070] Among them, the height of the plurality of first guide wheels 2232 is synchronously adjusted through the first support frame 2231 to adjust the height of the first end of the winding drum 2; or the first support frame 2231 has a plurality of support parts with adjustable heights corresponding to the plurality of first guide wheels 2232 respectively, so as to facilitate the adjustment of the heights of the plurality of first guide wheels 2232 through the plurality of support parts respectively, so as to adjust the height of the first end of the winding drum 221.

[0071] Optionally, as Figure 4 shown in the figure, the first support frame 2231 has a first long circular hole 22311 corresponding to the first guide wheel 2232. The first guide wheel 2232 is fixedly connected to the first support frame 2231 based on the corresponding first long circular hole 22311, and the first guide wheel 2232 can move along the length direction of the corresponding first long circular hole 22311.

[0072] Among them, the axial direction of the first guide wheel 2232 has a fixing rod, which passes through the first long circular hole 22311 and is fixed on the first support frame 2231 by a fixing nut. Since the first guide wheel 2232 can move along the length direction of the first long circular hole 22311, that is, the fixing rod can move along the length direction of the first long circular hole 22311, the position of the first guide wheel 2232 can be adjusted, so as to adjust the height of the first end of the drum 221.

[0073] Among them, the length directions of the first long circular holes 22311 corresponding to each first guide wheel 2232 are the same. For example, when the wire supported by the two first guide wheels 2232 is at the lower part of the first end of the drum 221, the length directions of the first long circular holes 22311 are both vertical or horizontal directions. Of course, the length directions of the first long circular holes 22311 corresponding to each first guide wheel 2232 can also be different. For example, when the wire supported by the two first guide wheels 2232 is at the lower part of the first end of the drum 221, the inclinations of the two first long circular holes 22311 are opposite or contrary.

[0074] When the length direction of the first long circular hole 22311 is not the vertical direction, by adjusting the distance between the two first guide wheels 2232, the height of the first end of the drum 221 can be adjusted.

[0075] It should be noted that the coiling motor 222 is movably fixed on the base 21, so that when adjusting the height of the first end of the drum 221, the position of the coiling motor 222 can be adjusted, so as to ensure that the coiling motor 222 and the first end of the drum 221 move synchronously.

[0076] For example, the side wall of the base 21 has a second long circular hole, and the coiling motor 222 is fixedly connected to the side wall of the base 21 through the second long circular hole, and the coiling motor 222 can move along the length direction of the second long circular hole. Of course, the coiling motor 222 can also be movably fixed on the base 21 in other ways, and the embodiments of the present application do not limit this.

[0077] In the embodiments of the present application, when the one end of the drum 221 is limited by a plurality of first guide wheels, the connection manner between the coiling motor 222 and the first end of the drum 221 is different, and the limiting manner is also different.

[0078] Among them, the connection manner between the coiling motor 222 and the drum 221 is that the coiling motor 222 is in transmission connection with the inner wall of the drum 221, or the coiling motor 222 is in transmission connection with the outer wall.

[0079] When the output shaft of the winding motor 222 is in driving connection with the inner wall of the winding drum 221, the output shaft of the winding motor 222 is fixedly connected to the inner wall of the winding drum 221 or connected by means of gear meshing to achieve power transmission. Exemplarily, the winding motor 222 is the motor of the winding drum 221. Of course, the winding motor 222 is a motor of other styles, as long as the driving connection between the winding motor 222 and the inner wall of the winding drum 221 can be achieved, and the embodiments of the present application do not make any limitations in this regard.

[0080] When the output shaft of the winding motor 222 is in driving connection with the outer wall of the winding drum 221, the output shaft of the winding motor 222 is connected to the outer wall of the winding drum 221 by means of gear meshing or by means of a conveyor belt to achieve power transmission.

[0081] In some embodiments, the output of the winding motor 222 is in driving connection with the inner wall of the winding drum 221. At this time, the output shaft of the winding motor 222 supports the inner wall of the winding drum 221, thereby realizing the radial limit of the first end of the winding drum 221. Therefore, it is only necessary for the plurality of first guide wheels 2232 to limit the first end of the winding drum 221 axially. That is to say, the output of the winding motor 222 is in driving connection with the inner wall of the winding drum 221, and the first end of the winding drum 221 is axially limited on at least one first guide wheel 2232.

[0082] Among them, at least one of the plurality of first guide wheels 2232 can realize the axial limit of the first end of the winding drum 221. Of course, it is also possible for the plurality of first guide wheels 2232 to limit the first end of the winding drum 221 axially at the same time to ensure the effectiveness of the limit.

[0083] Optionally, as Figure 4 shown, the first guide wheel 2232 has a stepped surface 22321 facing the second end of the winding drum 221, and the end surface of the first end of the winding drum 221 abuts against the stepped surface 22321. In this way, since the first guide wheel 2232 is fixed to the base 21 by the first bracket, when the end surface of the first end of the winding drum 221 abuts against the stepped surface 22321 of the first guide wheel 2232, the axial limit of the first end of the winding drum 221 can be realized to prevent the winding drum 221 from moving away from the second support mechanism 224.

[0084] Optionally, the first end of the winding drum 221 has a stepped surface facing away from its second end, and the side surface of the first guide wheel 2232 abuts against the stepped surface. In this way, since the first guide wheel 2232 is fixed to the base 21 by the first bracket, when the stepped surface of the winding drum 221 abuts against the side surface of the first guide wheel 2232, the axial limit of the first end of the winding drum 221 can be realized to prevent the winding drum 221 from moving away from the second support mechanism 224.

[0085] Optionally, the reel 221 has an annular groove, and a part of the first guide wheel 2232 is located in the annular groove. In this way, since the first guide wheel 2232 is fixed to the base 21 through the first bracket, when a part of the first guide wheel 2232 is limited in the annular groove, axial limitation of the first end of the reel 221 can be achieved to prevent the reel 221 from moving away from the second support mechanism 224.

[0086] Since the output shaft of the coiling motor 222 extends into the first end of the reel 221, when limiting the first end of the reel 221, in order not to affect the rotation of the reel 221 driven by the coiling motor 222, the annular groove is located on the outer wall of the first end of the reel 221.

[0087] A part of the body of the first guide wheel 2232 is located in the annular groove to achieve axial limitation of the first end of the reel 221; of course, axial limitation of the first end of the reel 221 can also be achieved by other means. For example, the first guide wheel 2232 has an annular protrusion, and a part of the annular protrusion is located in the annular groove.

[0088] In some other embodiments, the output of the coiling motor 222 is in transmission connection with the outer wall of the reel 221. At this time, the coiling motor 222 does not limit the radial direction of the reel 221. Therefore, the plurality of first guide wheels 2232 not only need to limit the axial direction of the reel 221, but also need to limit the radial direction of the reel 221. That is, the output shaft of the coiling motor 222 is in transmission connection with the outer wall of the reel 221, and the first end of the reel 221 is axially and radially limited on the plurality of first guide wheels 2232.

[0089] The way for the plurality of first guide wheels 2232 to limit the first end of the reel 221 axially is the same as or similar to that described in the above embodiments, and the embodiments of the present application will not elaborate on this.

[0090] It should be noted that when limiting the first end of the reel 221 by the above second method, since the output shaft of the coiling motor 222 is in transmission connection with the outer wall of the reel 221, at this time, the annular groove can be located not only on the outer wall of the first end of the reel 221, but also on the inner wall of the first end of the reel 221. The embodiments of the present application do not make a limitation on this.

[0091] When limiting the first end of the reel 221 radially by the plurality of first guide wheels 2232, optionally, the number of the first guide wheels 2232 is two, and the two first guide wheels 2232 extend into the reel 221, and the first end of the reel 221 is radially limited on the two first guide wheels 2232.

[0092] Among them, when limiting the first end of the reel 221 radially through two first guide wheels 2232, the two first guide wheels 2232 are respectively supported at two end points in the diameter direction of the inner wall of the reel 221, and the diameter direction is the horizontal direction or the vertical direction. Of course, it can also be other directions, and the embodiments of the present application do not limit this.

[0093] Exemplarily, one first guide wheel 2232 contacts the bottommost part of the inner wall of the reel 221, and the other first guide wheel 2232 contacts the topmost part of the inner wall of the reel 221.

[0094] Optionally, the number of the first guide wheels 2232 is three, and the first end of the reel 221 is limited radially on the three first guide wheels 2232.

[0095] Exemplarily, the centers of the three first guide wheels 2232 form an acute triangle, and the three first guide wheels 2232 surround and abut against the outer wall of the reel 221, or the three first guide wheels 2232 extend into the first end of the reel 221 and abut against the inner wall of the reel 221. Of course, the three first guide wheels 2232 can also limit the first end of the reel 221 radially in other ways, and the embodiments of the present application do not limit this.

[0096] In some embodiments, as Figure 6 shown, the second support mechanism 224 includes a second support frame 2241 and a plurality of second guide wheels 2242; the second support frame 2241 is fixed on the base 21, and the plurality of second guide wheels 2242 are fixed on the second support frame 2241. The second end of the reel 221 is rotatably supported and limited on the plurality of second guide wheels 2242, and the positions of the plurality of second guide wheels 2242 in the radial direction are adjustable.

[0097] In this way, by adjusting the positions of the plurality of second guide wheels, the height of the reel 221 can be adjusted to ensure the flexibility of the height of the second end of the reel 221. In addition, while limiting the reel 221 by the plurality of second guide wheels, the plurality of second guide wheels 2242 can also support the second end of the reel 221.

[0098] Among them, the sizes and materials of the plurality of second guide wheels 2242 are respectively the same as or similar to those of the plurality of first guide wheels 2232 described above, and the embodiments of the present application do not limit this. In addition, the adjustment method of the positions of the second guide wheels 2242 and the method of limiting the second end of the reel 221 radially and axially by the second guide wheels 2242 are the same as or similar to the methods described in the above embodiments, and the embodiments of the present application do not limit this.

[0099] In the embodiments of the present application, the second guide wheels 2242 not only need to limit the second end of the reel 221 axially, but also need to limit it radially.

[0100] Among them, when the second end of the reel 221 is limited axially and radially by the second guide wheel 2242, the limiting method is the same or similar to the axial and radial limiting method of the first end of the reel 221 by the multiple first guide wheels 2232 in the above-mentioned embodiment, and the embodiments of the present application will not repeat it.

[0101] For example, Figure 6 As shown, there are three second guide wheels 2242 , and the first end of the reel 221 is radially limited on the three second guide wheels 2242 .

[0102] Optionally, the centers of the three second guide wheels 2242 form an acute-angled triangle, and the three second guide wheels 2242 surround the reel 221 and abut against the outer wall of the reel 221, or the three second guide wheels 2242 extend into the first end of the reel 221 and abut against the inner wall of the reel 221. Of course, the three second guide wheels 2242 can also limit the first end of the reel 221 in the radial direction by other methods, which is not limited in this embodiment of the present application.

[0103] Alternatively, as Figure 6 As shown, two of the three second guide wheels 2242 are supported below the second end of the reel 221 , and the remaining second guide wheel 2242 is pressed against the inner wall of the second end of the reel 221 .

[0104] In an embodiment of the present application, the structure of the curling component 22 may be other structures in addition to the structure described above, that is, the reel 221 included in the curling component 22 is rotatably supported and limited on the base by other means after being connected to the curling motor 222. This embodiment of the present application does not limit this.

[0105] Next, the lifting assembly 23 will be described in detail.

[0106] In some embodiments, as Figure 7 or Figure 8 As shown, the lifting assembly 23 includes a lifting frame 231, a hydraulic rod 232, and a crossbeam 233. The first end of the lifting frame 231 and the first end of the hydraulic rod 232 are both rotatably connected to the base 21. The second end of the lifting frame 231 is rotatably connected to the crossbeam 233. The second end of the hydraulic rod 232 is rotatably connected to the lifting frame 231. The hydraulic rod 232 can cause the lifting frame 231 to rise, thereby driving the crossbeam 233 to rise. The two opposite sides of the screen 24 are fixedly connected to the curling assembly 22 and the crossbeam 233, respectively. When the crossbeam 233 rises, it drives the screen 24 to unfold to receive the light beam.

[0107] Wherein, when the projection device includes a storage part, the hydraulic rod 232 can urge the lifting frame 231 to rise, so as to drive the cross beam 233 to pass through the opening of the second accommodating part and rise.

[0108] In the embodiment of the present application, when starting up is required, the curling assembly 22 rotates forward to unroll the screen 24. Since the compression on the hydraulic rod 232 is reduced, the elastic potential energy stored in the hydraulic rod 232 is released. At this time, the hydraulic rod 232 elongates. As the hydraulic rod 232 elongates, the lifting frame 231 is pushed to rise, thereby urging the cross beam 233 to rise. At this time, the cross beam 233 drives the screen 24 to rise until the screen 24 rises to a predetermined height. At this time, the curling assembly 22 stops rotating, so as to realize the smooth unfolding of the screen 24 under the tensioning action of the curling assembly 22 on the screen 24 and the supporting action of the hydraulic rod 232 on the screen 24. When shutting down, the curling assembly 22 rotates in the reverse direction to retract the screen 24. At the same time, the screen 24 drives the cross beam 233 to move downward synchronously. At this time, the height of the lifting frame 231 decreases to compress the hydraulic rod 232 and store elastic potential energy until the screen 24 drops to a predetermined height. At this time, the curling assembly 22 stops rotating, so as to realize the smooth retraction of the screen 24 under the tensioning action of the curling assembly 22 on the screen 24 and the supporting action of the hydraulic rod 232 on the screen 24. From the above process of starting up and shutting down, it can be seen that in the embodiment of the present application, the setting of an additional power supply system and control system is avoided, and the structural complexity of the lifting assembly 23 is reduced.

[0109] Optionally, as Figure 7 shown, the lifting frame 231 includes a first connecting rod 2311 and a second connecting rod 2312; the first end of the first connecting rod 2311 is rotatably connected to the base 21, the first end of the second connecting rod 2312 is rotatably connected to the cross beam 233, and the second end of the first connecting rod 2311 is rotatably connected to the second end of the second connecting rod 2312.

[0110] Wherein, as Figure 7 shown, the second end of the hydraulic rod 232 is rotatably connected to the first connecting rod 2311, so as to urge the first connecting rod 2311 to rotate when the hydraulic rod 232 elongates. Furthermore, the first connecting rod 2311 drives the second connecting rod 2312 to rotate synchronously, realizing the rising of the lifting frame 231. When the lifting frame 231 descends, the first connecting rod 2311 and the second connecting rod 2312 rotate to store the elastic potential energy of the hydraulic rod 232 under the compression of the first connecting rod 2311 on the hydraulic rod 232.

[0111] Alternatively, the second end of the hydraulic rod 232 is rotatably connected to the second link 2312. When the hydraulic rod 232 extends, it causes the second link 2312 to rotate. Further, the second link 2312 drives the first link 2311 to rotate synchronously, realizing the raising of the lifting frame 231. When the lifting frame 231 descends, the first link 2311 and the second link 2312 rotate to store the elastic potential energy of the hydraulic rod 232 under the compression of the second link 2312 on the hydraulic rod 232.

[0112] In the embodiment of the present application, the screen 24 needs to bear the tension force of the curling assembly 22 on the screen 24 and the supporting force of the hydraulic rod 232 on the screen 24. Thus, it is easy to damage the screen 24 under the action of the tension force and the supporting force. Therefore, optionally, the lifting assembly 23 further includes a tension rope. The first end of the tension rope is fixed to the base 21, and the second end of the tension rope is fixedly connected to the cross beam 233. In this way, the elastic force of the tension rope itself can reduce the force that the screen 24 needs to bear, thereby reducing the possibility of damage to the screen 24.

[0113] Optionally, in combination with the structure of the curling assembly 22 described above, the curling assembly 22 further includes a tension member. One end of the tension member is fixedly connected to the drum 221, and the other end of the tension member is fixedly connected to the cross beam 233. In this way, the tension member can bear the tension force of the curling assembly 22 on the screen 24 and the supporting force of the hydraulic rod 232 on the screen 24, thereby reducing the possibility of damage to the screen 24.

[0114] Wherein, the tension member is a flexible rope or a steel wire rope, etc., and the embodiment of the present application does not limit this.

[0115] In still some other embodiments, the lifting assembly 23 includes a plurality of hydraulic rods 232 and a cross beam 233; the first end of each hydraulic rod 232 is connected to the base 21, the second end of each hydraulic rod 232 is connected to the cross beam 233, and the plurality of hydraulic rods 232 can cause the cross beam 233 to rise; the two opposite sides of the screen 24 are respectively fixedly connected to the curling assembly 22 and the cross beam 233, and when the cross beam 233 rises, it drives the screen 24 to unfold to receive the light beam.

[0116] Wherein, in the case that the projection device includes a storage part, the hydraulic rod 232 can cause the cross beam 233 to pass through the opening of the second accommodating part and rise.

[0117] In the embodiment of the present application, when starting up is required, the curling assembly 22 rotates forward to unfurl the curtain sheet 24. Since the compression of the hydraulic rod 232 is reduced, the elastic potential energy stored in the hydraulic rod 232 is released. At this time, the hydraulic rod 232 extends and promotes the cross beam 233 to rise. At this time, the cross beam 233 drives the curtain sheet 24 to rise until the curtain sheet 24 rises to a predetermined height. At this time, the curling assembly 22 stops rotating, so as to realize the smooth unfolding of the curtain sheet 24 under the tensioning action of the curling assembly 22 on the curtain sheet 24 and the supporting action of the hydraulic rod 232 on the curtain sheet 24. When shutting down, the curling assembly 22 rotates in the reverse direction to retract the curtain sheet 24. At the same time, the curtain sheet 24 drives the cross beam 233 to move downward synchronously to compress the hydraulic rod 232 and store elastic potential energy until the curtain sheet 24 drops to a predetermined height. At this time, the curling assembly 22 stops rotating, so as to realize the smooth retraction of the curtain sheet 24 under the tensioning action of the curling assembly 22 on the curtain sheet 24 and the supporting action of the hydraulic rod 232 on the curtain sheet 24. From the above startup and shutdown processes, it can be seen that in the embodiment of the present application, the setting of an additional power supply system and control system is avoided, and the structural complexity of the lifting assembly 23 is reduced.

[0118] Wherein, the length direction of each hydraulic rod 232 is perpendicular to the length direction of the cross beam 233. Of course, the length direction of each hydraulic rod 232 is inclined, and the embodiment of the present application does not limit this.

[0119] Optionally, the plurality of hydraulic rods 232 at least includes a first hydraulic rod and a second hydraulic rod; the first ends of the first hydraulic rod and the second hydraulic rod are both fixed on the base 21, and the second ends of the first hydraulic rod and the second hydraulic rod are both fixedly connected to the cross beam 233. The length direction of each hydraulic rod 232 is perpendicular to the length direction of the cross beam 233.

[0120] Since both ends of the first hydraulic rod are fixedly connected between the base 21 and the cross beam 233, and both ends of the second hydraulic rod are fixedly connected between the base 21 and the cross beam 233, a rectangle can be formed by the first hydraulic rod, the second hydraulic rod, the cross beam 233 and the base 21, ensuring the stability of the lifting assembly 23 and avoiding the possibility of the curtain sheet 24 being skewed.

[0121] Wherein, the performance parameters of the first hydraulic rod are the same as those of the second hydraulic rod to ensure that at any moment, the length of the first hydraulic rod is the same as that of the second hydraulic rod, thereby further ensuring the stability of the lifting assembly 23.

[0122] Optionally, the plurality of hydraulic rods 232 at least includes a first hydraulic rod and a second hydraulic rod; the first ends of the first hydraulic rod and the second hydraulic rod are rotatably connected to the base 21, and the second ends of the first hydraulic rod and the second hydraulic rod are both rotatably connected to the cross beam 233.

[0123] Since both ends of the first hydraulic rod are rotatably connected to the base 21 and the cross beam 233 respectively, and both ends of the second hydraulic rod are rotatably connected to the base 21 and the cross beam 233 respectively, in order to allow the cross beam 233 to sway along its own length direction to ensure the stability of the lifting assembly 23, the inclinations of the first hydraulic rod and the second hydraulic rod are opposite to each other, that is, the first hydraulic rod, the second hydraulic rod, the cross beam 233 and the base 21 enclose an inverted trapezoid; or, the inclinations of the first hydraulic rod and the second hydraulic rod are in the opposite direction, that is, the first hydraulic rod, the second hydraulic rod, the cross beam 233 and the base 21 enclose an upright trapezoid. In this way, through the inclined support of the first hydraulic rod and the second hydraulic rod, it can be ensured that the component forces generated by the first hydraulic rod and the second hydraulic rod in the length direction of the cross beam 233 cancel each other out, thus avoiding the possibility of the cross beam 233 swaying.

[0124] Alternatively, in some other embodiments, in addition to setting the inclinations of the first hydraulic rod and the second hydraulic rod to be opposite or in the opposite direction, the lifting assembly 23 further includes a telescopic rod. The first end of the telescopic rod is fixed to the base 21, and the second end of the telescopic rod is fixedly connected to the cross beam 233. The length direction of the telescopic rod is perpendicular to the length direction of the cross beam 233. In this way, since both ends of the telescopic rod are fixedly connected to the cross beam 233 and the base 21 respectively, the telescopic rod can limit the movement, thus avoiding the possibility of the cross beam 233 swaying.

[0125] Among them, the number of telescopic rods can be set as required. For example, the lifting assembly 23 includes two telescopic rods, and the first ends of the two telescopic rods are respectively connected to both ends of the base 21.

[0126] It should be noted that the above settings of the inclinations of the first hydraulic rod and the second hydraulic rod being opposite or in the opposite direction, and the setting of the telescopic rod can be combined to further avoid the possibility of the cross beam 233 swaying, thereby further ensuring the stability of the lifting assembly 23.

[0127] In the embodiments of the present application, in order to avoid the possibility of the screen sheet 24 being damaged under the action of the tension force of the winding drum 221 and the supporting force of the hydraulic rod 232, optionally, the lifting assembly 23 further includes a tension rope. The first end of the tension rope is fixed to the base 21, and the second end of the tension rope is fixedly connected to the cross beam 233. In this way, the elastic force of the tension rope itself can reduce the force that the screen sheet 24 needs to bear, thereby reducing the possibility of the screen sheet 24 being damaged.

[0128] Optionally, in combination with the structure of the curling component 22 described above, the curling component 22 further includes a tensioning member. One end of the tensioning member is fixedly connected to the reel 221, and the other end of the tensioning member is fixedly connected to the cross beam 233. In this way, the tensioning member can bear the tension force of the curling component 22 on the screen 24 and the supporting force of the hydraulic rod 232 on the screen 24, thereby reducing the possibility of damage to the screen 24. Wherein, the tensioning member is a flexible rope or a steel wire rope, etc., and the embodiments of the present application do not limit this.

[0129] In the embodiments of the present application, through the support and limit of the reel by the first support mechanism and the second support structure, compared with fixing by a rotating shaft, it avoids the problem that the weight of the reel and the tension force of the screen act on the rotating shaft, resulting in easy damage to the rotating shaft, thereby prolonging the service life of the curling component, that is, prolonging the service life of the projection device. In addition, the height of the reel can also be adjusted through the first support mechanism and the second support mechanism. In this way, compared with the reel being fixed to the base through a rotating shaft, the flexibility of the reel position is improved. In addition, through the setting of the hydraulic rod, elastic potential energy can be stored when the screen is retracted, and the screen can be deployed based on the stored elastic potential energy, thereby avoiding the setting of an additional power supply system and a control system, and reducing the structural complexity and control difficulty of the lifting component.

[0130] The above are only illustrative embodiments of the embodiments of the present application, and are not used to limit the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the embodiments of the present application shall be included in the protection scope of the embodiments of the present application.

Claims

1. A projection device, characterized in that, The projection device includes: An optical engine for emitting a light beam; A projection screen including a base, a curling assembly, a lifting assembly, and a screen sheet. The lifting assembly includes a lifting frame, a hydraulic rod, and a cross beam; The curling assembly includes a reel, a curling motor, a first support mechanism, and a second support mechanism. The curling motor, the first support mechanism, and the second support mechanism are fixed on the base. The reel is in transmission connection with the curling motor. The reel is rotatably supported and limited at the tops of the first support mechanism and the second support mechanism. The first support mechanism and the second support mechanism are used to adjust the height of the reel. The first end of the lifting frame and the first end of the hydraulic rod are both rotatably connected to the base. The second end of the lifting frame is rotatably connected to the cross beam. The second end of the hydraulic rod is rotatably connected to the lifting frame. The hydraulic rod can cause the lifting frame to rise to drive the cross beam to rise; Two opposite sides of the screen sheet are respectively fixedly connected to the reel and the cross beam. The curling motor can drive the reel to rotate to curl the screen sheet. When the cross beam rises, it drives the screen sheet to unfold to receive the light beam.

2. The projection device according to claim 1, characterized in that The lifting frame includes a first connecting rod and a second connecting rod; The first end of the first connecting rod is rotatably connected to the base. The first end of the second connecting rod is rotatably connected to the cross beam. The second end of the first connecting rod is rotatably connected to the second end of the second connecting rod.

3. The projection device according to claim 2, wherein The second end of the hydraulic rod is rotatably connected to the first connecting rod.

4. The projection device according to claim 2, wherein The second end of the hydraulic rod is rotatably connected to the second connecting rod.

5. The projection device according to any one of claims 1-4, characterized in that, The curling assembly further includes a curling motor and a tensioning member; The reel is rotatably fixed on the base. The curling motor is fixed on the base and is in transmission connection with the reel. One end of the tensioning member is fixedly connected to the reel, and the other end of the tensioning member is fixedly connected to the cross beam.

6. The projection device according to claim 5, wherein, The tensioning member is a flexible rope.

7. A projection device, characterized in that, The projection device includes: An optical engine for emitting a light beam; A projection screen including a base, a screen sheet, a curling assembly, and a lifting assembly. The lifting assembly includes a plurality of hydraulic rods and a cross beam; The curling assembly includes a reel, a curling motor, a first support mechanism, and a second support mechanism. The curling motor, the first support mechanism, and the second support mechanism are fixed on the base. The reel is in transmission connection with the curling motor. The reel is rotatably supported and limited at the tops of the first support mechanism and the second support mechanism. The first support mechanism and the second support mechanism are used to adjust the height of the reel. The first end of each hydraulic rod is connected to the base, and the second end of each hydraulic rod is connected to the cross beam. The plurality of hydraulic rods can cause the cross beam to rise; Two opposite sides of the screen sheet are respectively fixedly connected to the reel and the cross beam. The curling motor can drive the reel to rotate to curl the screen sheet. When the cross beam rises, it drives the screen sheet to unfold to receive the light beam.

8. The projection device according to claim 7, characterized in that, The plurality of hydraulic rods includes at least a first hydraulic rod and a second hydraulic rod; The first ends of the first hydraulic rod and the second hydraulic rod are both fixed on the base, and the second ends of the first hydraulic rod and the second hydraulic rod are both fixedly connected to the cross beam. The length direction of each hydraulic rod is perpendicular to the length direction of the cross beam.

9. The projection device according to claim 7, characterized in that, The plurality of hydraulic rods at least includes a first hydraulic rod and a second hydraulic rod; The first ends of the first hydraulic rod and the second hydraulic rod are rotatably connected to the base, and the second ends of the first hydraulic rod and the second hydraulic rod are rotatably connected to the cross beam.

10. The projection device according to claim 9, wherein, The lifting assembly further includes a telescopic rod. The first end of the telescopic rod is fixed on the base, and the second end of the telescopic rod is fixedly connected to the cross beam. The length direction of the telescopic rod is perpendicular to the length direction of the cross beam.

11. The projection device according to any one of claims 7-10, characterized in that, The lifting assembly further includes a pulling rope. The first end of the pulling rope is fixed on the base, and the second end of the pulling rope is fixedly connected to the cross beam.

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