Projection device

Abstract

The embodiment of the application discloses a projection device, and belongs to the technical field of projection. The projection device comprises an optical engine and a projection screen, and the projection screen comprises a base, a curling mechanism, a lifting mechanism, a curtain and a controller. The curling mechanism is limited on the base, and a first side of the curtain is fixedly connected with the curling mechanism. The lifting mechanism comprises multiple groups of lifting assemblies and a cross beam. Each group of lifting assemblies comprises a lifting frame, a lifting motor and a reduction gear set. A first end of the lifting frame is rotatably connected with the base, a second end of the lifting frame is rotatably connected with the cross beam, the reduction gear set is connected with the lifting motor and the lifting frame respectively, and a second side of the curtain is fixedly connected with the cross beam. In the embodiment of the application, the rotation speed and the output torque of the lifting motor can be adjusted through the reduction gear set to output smaller rotation speed and larger torque, so that the stability and reliability of the lifting process of the lifting frame can be ensured, that is, the stability and reliability of the lifting of the curtain can be ensured.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of projection technology, and particularly relate to a projection device. BACKGROUND

[0002] With the continuous development of science and technology, projection devices are increasingly applied to people's work and life. At present, a projection device mainly comprises an optical engine and a projection screen. The light outlet of the optical engine is directed towards the projection screen to emit a light beam to the projection screen, and the projection screen is used to receive the light beam to realize display of a picture. SUMMARY

[0003] Embodiments of the present application provide a projection device, which can ensure the stability and reliability of the lifting of the projection screen included in the projection device. The technical solution is as follows:

[0004] A projection device, comprising:

[0005] an optical engine configured to emit a light beam;

[0006] a projection screen comprising a base, a curling mechanism, a lifting mechanism, a curtain sheet, and a controller;

[0007] the curling mechanism is limited on the base, a first side of the curtain sheet is fixedly connected with the curling mechanism, and the curling mechanism can control the curtain sheet to curl to fold the curtain sheet;

[0008] the lifting mechanism comprises a plurality of lifting assemblies and a cross beam, each lifting assembly comprises a lifting frame, a lifting motor, and a reduction gear set;

[0009] a first end of the lifting frame is rotatably connected with the base, a second end of the lifting frame is rotatably connected with the cross beam, the reduction gear set is connected with the lifting motor and the lifting frame respectively, and a second side of the curtain sheet is fixedly connected with the cross beam;

[0010] the controller is electrically connected with the lifting motor, the controller is configured to adjust the rotating speed of the lifting motor, the lifting motor can drive the lifting frame to lift through the reduction gear set, the lifting frame supports the cross beam when it is lifted to unfold the curtain sheet, the curtain sheet receives the light beam when it is unfolded, and the first side is opposite to the second side.

[0011] Optionally, the reduction gear set comprises a driving wheel, a driven wheel, and a driving wheel;

[0012] the driving wheel, the driven wheel, and the driving wheel are rotatably supported on the base, and the driving wheel, the driven wheel, and the driving wheel are sequentially engaged;

[0013] The driving wheel is fixedly connected with the first end of the lifting frame, and the axial direction of the driving wheel is perpendicular to the plane on which the lifting frame is located.

[0014] Optionally, the axial direction of the driving wheel is parallel to the axial direction of the lifting motor.

[0015] Optionally, the driving wheel and the output shaft of the lifting motor are connected through a transmission belt.

[0016] Optionally, the driving wheel and the output shaft of the lifting motor are fixedly connected.

[0017] Optionally, the axial direction of the driving wheel is perpendicular to the axial direction of the lifting motor.

[0018] Optionally, the speed reduction gear set further comprises a worm wheel and a worm;

[0019] The worm is fixedly connected with the output shaft of the lifting motor at one end, and the worm is engaged with the worm wheel.

[0020] The driving wheel is fixedly connected with the worm, and the axial direction of the driving wheel coincides with the axial direction of the worm.

[0021] Optionally, each lifting assembly further comprises a speed reduction box, and the speed reduction gear set is located in the speed reduction box.

[0022] Optionally, the lifting motor and the speed reduction gear set are fixed on the base, and the speed reduction gear set is fixedly connected with the first end of the lifting frame.

[0023] Optionally, each lifting assembly further comprises a first Hall sensor, the first Hall sensor is fixed on the lifting motor, the first Hall sensor is electrically connected with the controller, and the first Hall sensor is used to detect the rotation angle of the lifting motor.

[0024] Optionally, the lifting mechanism further comprises an inclination sensor, the inclination sensor is fixed on the cross beam, the inclination sensor is electrically connected with the controller, and the inclination sensor is used to detect the inclination angle of the cross beam.

[0025] A curtain lifting control method, the method is applied to the projection device in the above aspects, and the method comprises:

[0026] When the controller receives a lifting instruction, the controller controls the lifting motor to start, and the lifting instruction is used to instruct the controller to control the lifting motor to lift the lifting frame.

[0027] The controller determines the rotating speed of the lifting motor, and generates lifting information of the lifting motor, the lifting information including the rotating speed or a continuous starting duration of the lifting motor;

[0028] When the lifting information meets a preset condition, the controller controls the lifting motor to rotate based on the rotating speed;

[0029] When the lifting information does not meet the preset condition, the controller controls the lifting motor to stop.

[0030] Optionally, the controller determines the rotating speed of the lifting motor, including:

[0031] The controller determines a starting duration of the lifting motor;

[0032] The controller determines the rotating speed of the lifting motor based on the duration according to a first formula and a second formula as follows:

[0033] ω = 4 × 10 -10 × t 6 - 10 -7 × t 5 + 10 -5 × t 4 - 5 × 10 -4 × t 3 + 0.0105 × t 2 - 0.1063 × t + 0.987 (1)

[0034] n1 = ω ÷ 2π (2)

[0035] In the first formula and the second formula, the ω refers to an angular speed of the lifting motor, the t refers to a continuous duration of starting of the lifting motor, and the n1 refers to the rotating speed of the lifting motor.

[0036] Optionally, the curling mechanism includes a curling motor and a second Hall sensor, and each set of lifting assembly further includes a first Hall sensor, and the controller, after controlling the lifting frame to lift based on the rotating speed, further includes:

[0037] The controller acquires a first rotating angle and a second rotating angle, the first rotating angle being a rotating angle of the lifting motor detected by the first Hall sensor, and the second rotating angle being a rotating angle of the curling motor detected by the second Hall sensor;

[0038] The controller determines a first lifting height based on the first rotating angle, and determines a second lifting height based on the second rotating angle;

[0039] When the difference between the first rising height and the second rising height is greater than a difference threshold, the controller adjusts the rotating speed of the lifting motor or the curling motor, and returns to the step of acquiring the first rotating angle and the second rotating angle by the controller until the difference between the first rising height and the second rising height is less than or equal to the difference threshold.

[0040] Optionally, the lifting mechanism further comprises an inclination sensor, and the controller further comprises the following steps after controlling the lifting motor to stop:

[0041] The controller acquires an inclination detected by the inclination sensor;

[0042] When the inclination is greater than an angle threshold, the controller determines a rising distance and an inclination direction of the cross beam based on the inclination;

[0043] The controller determines a third rotating angle based on the rising distance and a target lifting motor based on the inclination direction;

[0044] The controller controls the target lifting motor to rotate based on the third rotating angle

[0045] The technical scheme provided by the embodiments of the present application has at least the following beneficial effects:

[0046] In the embodiments of the present application, when the projection device is used, the cooperation of the curling mechanism and the lifting mechanism can realize the unfolding of the screen, and the controller can adjust the rotating speed of the lifting motor included in the lifting mechanism, so as to ensure the uniform rising of the screen, thereby improving the display effect of the picture and ensuring the reliability of the projection device; when the projection device is not used, the cooperation of the curling mechanism and the lifting mechanism can realize the folding of the screen, so as to reduce the space occupied by the projection device. In addition, the speed reduction gear set included in the lifting mechanism can adjust the rotating speed and the output torque of the lifting motor to output smaller rotating speed and larger torque, so that the stability and reliability of the lifting process of the lifting frame are ensured, that is, the stability and reliability of the screen lifting are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0048] Figure 1 is a structural schematic diagram of a projection device provided by the embodiments of the present application;

[0049] Figure 2 is a structural schematic diagram of an optical engine provided by an embodiment of the present application;

[0050] Figure 3 is a structural schematic diagram of a lifting mechanism provided by an embodiment of the present application;

[0051] Figure 4 is a structural schematic diagram of another lifting mechanism provided by an embodiment of the present application;

[0052] Figure 5 is a top view structural schematic diagram of a speed reduction gear set provided by an embodiment of the present application;

[0053] Figure 6 is a front view structural schematic diagram of a speed reduction gear set provided by an embodiment of the present application;

[0054] Figure 7 is a flowchart of a curtain lifting control method provided by an embodiment of the present application.

[0055] Reference signs:

[0056] 1: optical engine; 2: projection screen; 3: storage part;

[0057] 11: light source system; 12: illumination system; 13: lens; 14: heat dissipation component;

[0058] 21: base; 22: curling mechanism; 23: lifting mechanism; 24: curtain;

[0059] 231: cross beam; 232: lifting frame; 233: lifting motor; 234: speed reduction gear set; 235: speed reduction box;

[0060] 2321: first connecting rod; 2322: second connecting rod;

[0061] 2341: driving wheel; 2342: driven wheel; 2343: driving wheel; 2344: worm wheel; 2345: worm;

[0062] 31: first accommodating part; 32: second accommodating part. DETAILED DESCRIPTION

[0063] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0064] Figure 1 A structural schematic diagram of a projection device provided by an embodiment of the present application is shown. As shown in FIG. 1, the projection device comprises an optical engine 1, a projection screen 2 and a storage part 3. Figure 1As shown, the projection device comprises: an optical engine 1, the optical engine 1 is used for emitting a light beam; a projection screen 2, the projection screen 2 comprises a base 21, a curling mechanism 22, a lifting mechanism 23 and a curtain 24, the curling mechanism 22 is limited on the base 21, the lifting mechanism 23 is fixed on the base 21, a first side of the curtain 24 is fixedly connected with the curling mechanism 22, the curling mechanism 22 can control the curtain 24 to curl to fold the curtain 24, a second side of the curtain 24 is fixedly connected with the lifting mechanism 23, and the lifting mechanism 23 can control the curtain 24 to unfold to receive the light beam emitted by the optical engine 1. Wherein, the first side of the curtain 24 is opposite to the second side.

[0065] In this way, when the projection device is used, the unfolding of the curtain 24 can be realized through the cooperation of the curling mechanism 22 and the lifting mechanism 23, so as to ensure the normal use of the projection device; and when the projection device is not used, the folding of the curtain 24 can be realized through the cooperation of the curling mechanism 22 and the lifting mechanism 23, so as to reduce the space occupied by the projection device.

[0066] In the embodiment of the application, the projection device is a laser projection device. Alternatively, the laser projection device is an ultra-short focus projection device, at this time, the optical engine 1 included in the ultra-short focus projection device is an ultra-short focus optical engine, and the ultra-short focus optical engine is a DLP (Digital Light Procession) optical engine, for example. Since the optical engine 1 is an ultra-short focus optical engine, the distance from the ultra-short focus optical engine to the plane where the curtain 24 included in the projection screen 2 is located can be set to a relatively short distance, that is, the distance between the optical engine 1 and the projection screen 2 can be shortened, so as to facilitate the integrated design of the optical engine 1 and the projection screen 2.

[0067] As shown in the figure, Figure 2 The optical engine 1 comprises a light source system 11, an illumination system 12 and a lens 13. Wherein, the specific structure of the light source system 11, the illumination system 12 and the lens 13 can refer to the related technology, and the embodiment of the application does not limit this.

[0068] 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, etc.

[0069] During use of the optical engine 1, the light source system 11 emits three primary color light beams, which are integrated by the lenses in the illumination system 12, and then irradiate onto the surface of a DMD (Digital Micromirror Device) in the illumination system 12. The DMD is a display chip containing many small mirrors that can quickly flip. The light beams are reflected by the DMD and then pass through the lens 13, and are diffused by the lens 13 to exit the screen 24, thereby realizing the display of a colorful picture on the screen 24.

[0070] As shown in Figure 2 The optical engine 1 further includes a heat dissipation assembly 14, which is configured to dissipate heat from the light source system 11, the illumination system 12, and the lens 13, so as to avoid the device temperature from being too high due to the heat accumulated inside the light source system 11, the illumination system 12, and the lens 13, thereby affecting the optical performance of the device. For example, the heat dissipation assembly 14 includes a fan, a liquid cooling device, etc.

[0071] In the embodiment, the projection device includes a functional assembly, which is electrically connected to the optical engine 1. The functional assembly is configured to be electrically connected to an external power supply, and the optical engine 1 is capable of emitting light beams under the cooperation of the functional assembly.

[0072] The functional assembly includes a power board, a display board, and a control mainboard. The power board is connected to the optical engine 1, the display board, and the control mainboard, respectively. The power board is further configured to be connected to the external power supply. The display board is electrically connected to the optical engine 1 and the control mainboard, respectively.

[0073] In combination with the above explanation of the optical engine 1, the power board is electrically connected to the light source system 11, and the display board is electrically connected to the DMD included in the illumination system 12.

[0074] The power board is capable of outputting voltage or current driving signals, thereby facilitating the power supply for the display board, the light source system 11, and other devices, so as to ensure the normal use of the projection device. The control mainboard is a TV (Television) mainboard. The plug-in end of the control mainboard is configured to be connected to a computer, a mobile phone, a USB flash disk, and other external devices. The control mainboard is configured to receive multimedia data transmitted by the external devices, decode the multimedia data to obtain video signals, and then transmit the decoded video signals to the display board. After that, the display board converts the received video signals into driving signals and transmits the driving signals to the DMD included in the illumination system 12, so as to drive the small mirrors on the DMD to deflect based on the driving signals, thereby emitting light beams through the DMD and diffusing the light beams by the lens 13 to the screen 24, and realizing the display of a colorful picture.

[0075] In the embodiments of the present application, the screen sheet 24 included in the projection screen 2 is an optical screen sheet, such as a rollable Fresnel optical screen or a flexible black grid screen. Compared with a conventional screen sheet, such a screen sheet 24 has a higher optical gain, can restore the brightness and contrast of a light beam as much as possible, and can achieve a higher flatness through the stretching of the rolling mechanism 22 and the lifting mechanism 23, so that the picture display effect of the screen sheet 24 is better.

[0076] In the embodiments of the present application, as shown in Figure 1 The projection device further includes a receiving part 3 having a first accommodating part 31 and a second accommodating part 32. The optical engine 1 is fixed in the first accommodating part 31, the first accommodating part 31 has a light-transmitting area through which the light beam emitted by the optical engine 1 passes, and the base 21 included in the projection screen 2 is fixed in the second accommodating part 32, the second accommodating part 32 has an opening through which the screen sheet 24 can be controlled to pass and be unfolded by the lifting mechanism 23. In this way, when the rolling mechanism 22 rolls up the screen sheet 24, the screen sheet 24 can be stored in the second accommodating part 32, and thus the optical engine 1 and the projection screen 2 can be protected by the first accommodating part 31 and the second accommodating part 32 respectively when the projection device is not used, so as to avoid displacement or damage under the impact of foreign objects.

[0077] Optionally, the first accommodating part 31 and the second accommodating part 32 are integrally arranged, 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 completely receive the light beam emitted by the optical engine 1, so as to ensure the picture display effect of the screen sheet 24.

[0078] In other embodiments, the first accommodating part 31 and the second accommodating part 32 are separately arranged, so as to facilitate the separate carrying of the optical engine 1 and the projection screen 2, and facilitate the separate inspection of the optical engine 1 and the projection screen 2 when the optical engine 1 or the projection screen 2 fails.

[0079] Optionally, the opening of the second accommodating part 32 has a cover plate, so that when the projection device is not used, the opening of the second accommodating part 32 is shielded by the cover plate, so as to avoid dirt entering the second accommodating part 32, and when the projection device is used, the cover plate is opened, and the screen sheet 24 is controlled to be unfolded by the lifting mechanism 23 in cooperation with the rolling mechanism 22, so as to ensure the normal lifting of the screen sheet 24.

[0080] The cover plate is switched between shielding the opening and avoiding the opening in a sliding manner or a rotating manner.

[0081] For example, the second accommodating portion 32 has an electric lifting rod therein, a fixed end of the electric lifting rod is fixed in the second accommodating portion 32, a lifting end of the electric lifting rod is rotatably connected with the cover plate, the cover plate has a limiting column, the limiting column is movably limited on the side wall of the second accommodating portion 32; a connecting point of the electric lifting rod and the cover plate and a straight line where the limiting column is located are not parallel to the length direction of the cover plate, the electric lifting rod is used for adjusting the height of the connecting point to control the rotation of the cover plate. In this way, the height of the connecting point is adjusted by the electric lifting rod, at this time, the cover plate rotates relative to the side wall of the second accommodating portion 32 based on the limiting column, so as to realize the rotation of the cover plate. When the cover plate rotates, the opening is avoided or shielded.

[0082] The side wall of the second accommodating portion 32 perpendicular to the length direction thereof has a sliding groove, and the limiting column is movably limited in the sliding groove. In this way, when the height of the connecting point is adjusted by the electric lifting rod, the cover plate rotates in the sliding groove based on the limiting column to realize the rotation of the cover plate, and the limiting column slides in the sliding groove.

[0083] In the embodiment of the present application, the curling mechanism 22 is an energy storage type mechanism or an electric type mechanism. When the curling mechanism 22 is an electric type mechanism, the curling mechanism 22 at least includes a curling motor and a winding drum, the winding drum is rotatably limited on the base 21, the curling motor is in transmission connection with the winding drum, and the first side edge of the curtain 24 is fixedly connected with the winding drum. In this way, when the winding drum is driven to rotate by the curling motor, the curtain 24 can be curled on the winding drum, so as to realize the folding of the curtain 24.

[0084] Alternatively, the two ends of the winding drum are limited on the side wall of the base 21 through bearings, or the two ends of the winding drum are rotatably limited and supported on the base 21 through a support structure.

[0085] The height of the support structure is adjustable, so as to adjust the height of at least one end of the winding drum through the support mechanism, thereby ensuring the flexibility of the winding drum.

[0086] In the embodiment of the present application, as shown in Figure 3 The lifting mechanism 23 includes a plurality of lifting assemblies and a cross beam 231, each lifting assembly includes a lifting frame 232, a lifting motor 233 and a speed reduction gear set 234; the first end of the lifting frame 232 is rotatably connected with the base 21, the second end of the lifting frame 232 is rotatably connected with the cross beam 231, the speed reduction gear set 234 is connected with the lifting motor 233 and the lifting frame 232 respectively, and the second side edge of the curtain 24 is fixedly connected with the cross beam 231; the lifting motor 233 can drive the lifting frame 232 to lift through the speed reduction gear set 234, and the lifting frame 232 lifts to support the cross beam 231 to unfold the curtain 24 when the lifting frame 232 lifts.

[0087] In the embodiment of the present application, the rotation speed and the output torque of the lifting motor 233 can be adjusted by the speed reduction gear set 234, so that a smaller rotation speed and a larger torque can be output by the speed reduction gear set 234, thereby ensuring the stability and reliability of the lifting process of the lifting frame 232.

[0088] Optionally, as shown in Figure 3 the lifting motor 233 and the speed reduction gear set 234 are fixed on the base 21, and the speed reduction gear set 234 is fixedly connected with the first end of the lifting frame 232. In this way, the position of the lifting motor 233 and the speed reduction gear set 234 lowers the gravity center of the lifting mechanism 23, thereby improving the stability of the lifting mechanism 23.

[0089] In the embodiment of the present application, the gears included in the speed reduction gear set 234 are rotatably fixed on the base 21 by the gear support, or the gears other than the gears connected with the lifting frame 232 and / or the lifting motor 233 in the speed reduction gear set 234 are rotatably fixed on the base 21 by the gear support.

[0090] Of course, in another embodiment, the lifting motor 233 and the speed reduction gear set 234 are fixed on the cross beam 231, and the speed reduction gear set 234 is fixedly connected with the second end of the lifting frame 232.

[0091] In the embodiment of the present application, the gears included in the speed reduction gear set 234 are rotatably fixed on the cross beam 231 by the gear support, or the gears other than the gears connected with the lifting frame 232 and / or the lifting motor 233 in the speed reduction gear set 234 are rotatably fixed on the cross beam 231 by the gear support.

[0092] Optionally, as shown in Figure 4 each lifting assembly further includes a speed reduction box 235, and the speed reduction gear set 234 is located in the speed reduction box 235. In this way, the gears are protected by the speed reduction box 235, so that dirt is prevented from adhering to the gears, thereby ensuring the transmission effect between the speed reduction gear sets 234.

[0093] In the embodiment of the present application, the speed reduction box 235 has a first through hole and a second through hole, and the speed reduction gear set 234 is connected with the lifting motor 233 and the lifting frame 232 correspondingly based on the first through hole and the second through hole respectively.

[0094] In the embodiment of the present application, the lifting frame 232 is a hinged lifting frame 232, that is, the lifting frame 232 is composed of a plurality of connecting rods connected by hinging.

[0095] Optionally, as shown in Figure 3 or Figure 4As shown, the lifting frame 232 comprises a first connecting rod 2321 and a second connecting rod 2322, a first end of the first connecting rod 2321 is rotatably connected with the base 21, a first end of the second connecting rod 2322 is rotatably connected with the cross beam 231, and a second end of the first connecting rod 2321 is hingedly connected with a second end of the second connecting rod 2322.

[0096] Optionally, the lifting frame 232 comprises a first connecting rod, a second connecting rod, a first supporting rod and a second supporting rod, a first end of the first connecting rod is rotatably connected with the base 21, a first end of the second connecting rod is rotatably connected with the cross beam 231, a second end of the first connecting rod is hingedly connected with a second end of the second connecting rod, a first end of the first supporting rod is rotatably connected with the first connecting rod, a first end of the second supporting rod is rotatably connected with the second connecting rod, and a second end of the first supporting rod is hingedly connected with a second end of the second supporting rod.

[0097] For the above two kinds of lifting frames 232, the speed reduction gear set 234 is fixedly connected with the first end of the first connecting rod 2321, and the lifting motor 233 can drive the first connecting rod 2321 to rotate through the speed reduction gear set 234 to adjust the distance between the first end of the first connecting rod 2321 and the first end of the second connecting rod 2322, so as to realize the lifting of the cross beam 231; or the speed reduction gear set 234 is fixedly connected with the first end of the second connecting rod 2322, and the lifting motor 233 can drive the second connecting rod 2322 to rotate through the speed reduction gear set 234 to adjust the distance between the first end of the first connecting rod 2321 and the first end of the second connecting rod 2322, so as to realize the lifting of the cross beam 231.

[0098] Optionally, the speed reduction gear set 234 is connected with the first end of the first connecting rod 2321 through a first fixed rod, and the first end of the first connecting rod 2321 is connected with the base 21 through a first rotating shaft, at this time, the length direction of the first fixed rod coincides with the length direction of the first rotating shaft; or the speed reduction gear set 234 is connected with the first end of the second connecting rod 2322 through a second fixed rod, and the first end of the second connecting rod 2322 is connected with the cross beam 231 through a second rotating shaft, at this time, the length direction of the second fixed rod coincides with the length direction of the second rotating shaft.

[0099] In the embodiment of the application, the number of gears included in the speed reduction gear set 234 is multiple, for example, the speed reduction gear set 234 comprises two gears or three gears, as long as the high rotating speed and low torque output by the lifting motor 233 can be adjusted to low rotating speed and high torque, which is not limited in the embodiment of the application.

[0100] Optionally, as Figure 5As shown, the reduction gear set 234 comprises a driving wheel 2341, a driven wheel 2342 and a driving wheel 2343; the driving wheel 2341, the driven wheel 2342 and the driving wheel 2343 are rotatably supported on the base 21, and the driving wheel 2341, the driven wheel 2342 and the driving wheel 2343 are in engagement in sequence; the driving wheel 2341 is connected with the output shaft of the lifting motor 233, and the lifting motor 233 can drive the driving wheel 2341 to rotate; the driving wheel 2343 is fixedly connected with the first end of the lifting frame 232, and the axial direction of the driving wheel 2343 is perpendicular to the plane where the lifting frame 232 is located.

[0101] In this way, the high rotation speed and the low torque output by the lifting motor 233 can be adjusted to a low rotation speed and a high torque through the engagement between the driving wheel 2341, the driven wheel 2342 and the driving wheel 2343. In combination with the structure of the lifting frame 232 described above, the driving wheel 2343 is fixedly connected with the first end of the first connecting rod 2321, so as to ensure that the driving wheel 2343 and the first connecting rod 2321 rotate synchronously.

[0102] The transmission ratio of the reduction gear set 234 can be calculated through the following third formula, and then the rotation speed of the first connecting rod 2321 and the torque obtained by the first connecting rod 2321 can be determined according to the fourth formula and the fifth formula respectively, so that the structure of the reduction gear set 234 can be adjusted according to the rotation speed and the output torque of the lifting motor 233, and the rotation speed and the torque required by the first connecting rod 2321, so as to adjust the transmission ratio of the reduction gear set 234.

[0103] i = i1 x i2 x i3 (3)

[0104] n2 = n1 ÷ i (4)

[0105] T2 = T1 x i (5)

[0106] In the third formula, the fourth formula and the fifth formula, i refers to the transmission ratio of the reduction gear set 234; i1 refers to the transmission ratio between the lifting motor 233 and the driving wheel 2341; i2 refers to the transmission ratio between the driving wheel 2341 and the driven wheel 2342; i3 refers to the transmission ratio between the driven wheel 2342 and the driving wheel 2343; n1 refers to the rotation speed of the lifting motor 233; n2 refers to the rotation speed of the first connecting rod 2321; T1 refers to the output torque of the lifting motor 233; and T2 refers to the torque obtained by the first connecting rod 2321.

[0107] Alternatively, since the driving wheel 2343 is fixedly connected with the lifting frame 232, at this time, the driving wheel 2341 and the driven wheel 2342 can also be rotatably supported on the base 21, that is, the driving wheel 2343 does not need to be supported.

[0108] It should be noted that the above-mentioned embodiment refers to the case that the reduction gear set 234 is fixed on the base 21, and when the reduction gear set 234 is fixed on the cross beam 231, the driving wheel 2341, the driven wheel 2342 and the driving wheel 2343 included in the reduction gear set 234 are rotatably supported on the base 21, and the driving wheel 2343 is fixedly connected with the second end of the lifting frame 232. In combination with the structure of the lifting frame 232 described above, the driving wheel 2343 is fixedly connected with the first end of the second connecting rod 2322, so as to ensure that the driving wheel 2343 and the second connecting rod 2322 rotate synchronously. Wherein, n2 calculated by the second formula and the third formula refers to the rotating speed of the second connecting rod 2322; T2 refers to the torque obtained by the second connecting rod 2322.

[0109] In the embodiment of the present application, when the driving wheel 2341 is connected with the lifting motor 233, the axial direction of the driving wheel 2341 is parallel to the axial direction of the lifting motor 233, or as shown in Figure 5 or Figure 6 the axial direction of the driving wheel 2341 is perpendicular to the axial direction of the lifting motor 233.

[0110] When the axial direction of the driving wheel 2341 is parallel to the axial direction of the lifting motor 233, the lifting motor 233 and the driving wheel 2341 are arranged along the thickness direction of the film 24. In this way, the size of the lifting mechanism 23 in the width direction of the film 24 can be reduced, so as to reduce the width of the projection screen 2.

[0111] Alternatively, the driving wheel 2341 and the output shaft of the lifting motor 233 are connected through a transmission belt, or the driving wheel 2341 and the output shaft of the lifting motor 233 are fixedly connected.

[0112] When the driving wheel 2341 and the output shaft of the lifting motor 233 are fixedly connected, in order to ensure that the driving wheel 2341 and the output shaft of the lifting motor 233 rotate synchronously, the axial direction of the driving wheel 2341 coincides with the axial direction of the output shaft of the lifting motor 233.

[0113] When the axial direction of the driving wheel 2341 is perpendicular to the axial direction of the lifting motor 233, the lifting motor 233 and the driving wheel 2341 are arranged along a direction parallel to the plane on which the film 24 is located. In this way, the size of the lifting mechanism 23 in the thickness direction of the film 24 can be reduced, so as to reduce the thickness of the projection screen 2.

[0114] Alternatively, as shown in Figure 6As shown, the reduction gear set 234 further comprises a worm wheel 2344 and a worm 2345; the worm wheel 2344 is rotatably supported on the base 21, one end of the worm 2345 is fixedly connected with the output shaft of the lifting motor 233, and the worm 2345 is engaged with the worm wheel 2344; the driving wheel 2341 is fixedly connected with the worm 2345, and the axial direction of the driving wheel 2341 coincides with the axial direction of the worm 2345. In this way, the rotation direction of the output shaft of the lifting motor 233 can be adjusted through the cooperation of the worm 2345 and the worm wheel 2344, and the driving wheel 2341 can be driven to rotate synchronously.

[0115] In the embodiment of the present application, the projection screen 2 further comprises a controller, the controller is electrically connected with the lifting motor 233, and the controller is used to adjust the rotating speed of the lifting motor 233. In this way, the rotating speed-time curve of the lifting motor 233 can be stored in the controller in advance when the projection device is used, wherein the rotating speed-time curve refers to the lifting curve that can ensure the uniform rising of the curtain 24, so that the uniform rising of the curtain 24 can be ensured under the control of the controller.

[0116] In the embodiment of the present application, each lifting assembly further comprises a first Hall sensor, the first Hall sensor is fixed on the lifting motor, the first Hall sensor is electrically connected with the controller, and the first Hall sensor is used to detect the rotating angle of the lifting motor 233. In this way, the first rising height of the curtain 24 can be determined from the pre-stored corresponding relationship between the rotating angle of the lifting motor 233 and the lifting height through the detection of the rotating angle of the lifting motor 233 by the first Hall sensor.

[0117] When the curling mechanism 22 is an energy storage type mechanism, the curling mechanism 22 has a continuous tensioning effect on the first side edge of the curtain 24, so that the flatness of the curtain 24 can be ensured under the lifting effect of the multiple lifting assemblies, and the picture display effect can be ensured.

[0118] When the curling mechanism 22 is an electric type mechanism, the curling mechanism 22 further comprises a second Hall sensor, the second Hall sensor is installed on the curling motor and is electrically connected with the controller, and the second Hall sensor is used to detect the rotating angle of the curling motor. In this way, the second rising height of the curtain 24 can be determined through the rotating angle of the curling motor detected by the second Hall sensor and the diameter of the winding drum, and the controller can determine whether the curtain 24 is in a flat state according to the difference between the first rising height and the second rising height. When the difference between the first rising height and the second rising height is large, it indicates that the flatness of the curtain 24 is poor at this time, and in order to ensure the picture display effect of the curtain 24, the controller can adjust the rotating speed of the lifting motor 233 or the curling motor to ensure that the difference between the first rising height and the second rising height is small, so as to ensure the picture display effect of the curtain 24.

[0119] In addition, after the controller determines the lifting height of the curtain 24, the controller can control the optical engine 1 to emit a light beam according to the lifting height of the curtain 24, so as to control the display speed of the picture, thereby ensuring that the lifting speed of the curtain 24 is synchronized with the display speed of the picture, and improving the display effect of the picture.

[0120] In the embodiment, the lifting mechanism 23 further comprises an inclination sensor fixed to the cross beam 231, the inclination sensor being electrically connected to the controller, and the inclination sensor being configured to detect the inclination of the cross beam 231. In this way, after the controller controls the plurality of lifting assemblies to be lifted to the position, the controller obtains the inclination detected by the inclination sensor, and determines whether the cross beam 231 is in the horizontal position according to the inclination. When the inclination is large, it indicates that the cross beam 231 is inclined. At this time, the controller can determine the inclination direction of the cross beam 231 and the height difference between the two ends of the cross beam 231 according to the inclination, and then determine the target lifting motor included in the target lifting assembly according to the inclination direction, and control the target lifting motor to rotate according to the third rotation angle, so as to make the cross beam 231 in the horizontal position, thereby ensuring the display effect of the picture of the curtain 24.

[0121] In the embodiment, the speed reduction gear set included in the lifting mechanism can adjust the rotation speed and the output torque of the lifting motor, so as to output a smaller rotation speed and a larger torque. In this way, the stability and reliability of the lifting process of the lifting frame are ensured, that is, the stability and reliability of the lifting of the curtain are ensured. In addition, the controller included in the lifting mechanism adjusts the rotation speed of the lifting motor, so as to ensure that the curtain is lifted at a constant speed, and the first Hall sensor and the second Hall sensor cooperate to ensure the flatness during the lifting of the curtain.

[0122] Figure 7 A flowchart of an example of a curtain lifting control method is shown. The method is applied to the projection device described in the above embodiment. The method illustrates a control method for lifting the curtain after the projection device receives a power-on instruction and is powered on. As shown in Figure 7 The method comprises the following steps.

[0123] Step 701: When the controller receives a lifting instruction, the controller controls the lifting motor to start.

[0124] According to the above description, after the projection device is powered on, the controller is in a powered-on state. In order to realize the unfolding of the curtain to receive the light beam emitted by the optical engine, the main controller included in the projection device can send a lifting instruction to the controller, so as to instruct the controller to control the lifting motor to lift the lifting frame.

[0125] Step 702: The controller determines the rotating speed of the lifting motor, and generates lifting information of the lifting motor.

[0126] After the lifting motor is started by the step 701, the rotating speed of the lifting motor needs to be controlled to ensure the uniform lifting of the curtain. In this way, the uniform lifting of the curtain can be realized by controlling the rotating speed of the lifting motor. In addition, after the rotating speed of the lifting motor is determined, the rotating speed or the continuous starting time length of the lifting motor is taken as the lifting information, that is, the lifting information includes the rotating speed or the continuous starting time length of the lifting motor.

[0127] The controller can determine the rotating speed of the lifting motor by the following method, and can also determine the rotating speed of the lifting motor by other methods, which are not limited in the embodiments of the application.

[0128] The controller determines the continuous starting time length of the lifting motor, and then determines the rotating speed of the lifting motor according to the following first formula and second formula based on the continuous starting time length.

[0129] ω=4×10 -10 ×t 6 -10 -7 ×t 5 +10 -5 ×t 4 -5×10 -4 ×t 3 +0.0105×t 2 -0.1063×t+0.987(1)

[0130] n1=ω÷2π (2)

[0131] In the first formula and the second formula, ω refers to the angular speed of the lifting motor, t refers to the continuous starting time length of the lifting motor, and n1 refers to the rotating speed of the lifting motor.

[0132] Step 703: When the lifting information meets the preset condition, the controller controls the lifting motor to rotate based on the rotating speed.

[0133] When the lifting information includes the continuous starting time length of the lifting motor, if the continuous starting time length of the lifting motor is less than a preset time length, it is determined that the lifting information meets the preset condition; when the lifting information includes the rotating speed, if the rotating speed is less than a preset rotating speed, it is determined that the lifting information meets the preset condition.

[0134] When the lifting information does not meet the preset condition, it indicates that the curtain has not been lifted to the unfolded state, and the lifting motor can be controlled to rotate according to the rotating speed determined in the step 702 to drive the lifting to continue lifting, so as to realize the continuous lifting of the curtain.

[0135] The ratio between the height corresponding to the unrolling of the film and the preset rising speed of the picture projected by the optical engine can be determined as the preset time length. The preset rotating speed can be determined in combination with the preset time length, the first formula and the second formula.

[0136] In the embodiment, during the process of controlling the lifting motor to rotate to realize the lifting of the lifting frame, in order to ensure the flatness of the film, the curling mechanism includes a curling motor and a second Hall sensor, and each lifting assembly further includes a first Hall sensor. At this time, the lifting motor and the curling motor can be controlled through the following steps (1)-(3).

[0137] (1) The controller obtains a first rotating angle and a second rotating angle.

[0138] The first rotating angle is the rotating angle of the lifting motor detected by the first Hall sensor, and the second rotating angle is the rotating angle of the curling motor detected by the second Hall sensor. The Hall sensor can detect the rotating angle of the motor in real time, and of course, the rotating angle of the motor can also be detected at intervals of a preset time length.

[0139] (2) The controller determines a first rising height based on the first rotating angle, and determines a second rising height based on the second rotating angle.

[0140] Alternatively, the controller can determine the first rising height according to the first rotating angle of the lifting motor according to the following sixth formula.

[0141] H = 15.6 x θ + 452 (6)

[0142] In the sixth formula, H refers to the first rising height, and θ refers to the first rotating angle of the lifting motor.

[0143] Alternatively, the controller can determine the rotating circumference corresponding to the winding drum according to the second rotating angle of the curling motor and the diameter of the winding drum, and then determine the rotating circumference corresponding to the winding drum as the second rising height.

[0144] (3) When the difference between the first rising height and the second rising height is greater than a difference threshold, the controller adjusts the rotating speed of the lifting motor or the curling motor, and returns to the step (1) until the difference between the first rising height and the second rising height is less than or equal to the difference threshold.

[0145] The difference threshold can be set according to the required flatness of the film, and the embodiment does not limit this. When the first rising height is greater than the second rising height, the lifting motor can be controlled to slow down or the curling motor can be controlled to speed up. When the first rising height is less than the second rising height, the lifting motor can be controlled to speed up or the curling motor can be controlled to slow down.

[0146] Step 704: When the lifting information meets the preset condition, the controller controls the lifting motor to stop.

[0147] When the lifting information includes the rotating speed, if the rotating speed is not less than the preset rotating speed, it is determined that the lifting information does not meet the preset condition; when the lifting information includes the continuous starting time length of the lifting motor, if the continuous starting time length of the lifting motor is not less than the preset time length, it is determined that the lifting information does not meet the preset condition.

[0148] When the lifting information meets the preset condition, it indicates that the curtain is lifted to the unfolded state at this moment, in order to avoid the continuous lifting of the curtain, the lifting motor can be controlled to stop.

[0149] Further, after the controller controls the lifting motor to stop, the cross beam can be in a tilted state, thereby causing poor flatness of the curtain and affecting the display effect of the picture on the curtain. At this moment, in combination with the above lifting mechanism including the inclination sensor, the height of the cross beam can also be adjusted in the following manner to ensure the flatness of the curtain.

[0150] The controller acquires the inclination detected by the inclination sensor; when the inclination is greater than an angle threshold, the controller determines the lifting distance and the tilting direction of the cross beam based on the inclination; the controller determines a third rotation angle based on the lifting distance and determines a target lifting motor based on the tilting direction; and the controller controls the target lifting motor to rotate based on the third rotation angle.

[0151] In this way, the controller can determine whether the cross beam is in a horizontal position according to the inclination detected by the inclination sensor. When the inclination is greater than the angle threshold, it indicates that the cross beam is in a tilted state, and at this moment, the controller can determine the tilting direction of the cross beam and the height difference between the two ends of the cross beam, that is, the lifting distance of the lower end of the cross beam, according to the inclination; further, the controller determines the third rotation angle at which the lifting motor needs to rotate based on the lifting distance, determines the target lifting motor included in the target lifting assembly based on the tilting direction, and controls the target lifting motor to rotate based on the third rotation angle, so as to realize that the cross beam is in a horizontal position, thereby ensuring the picture display effect of the curtain.

[0152] In the embodiments of the present application, through the cooperation of the winding mechanism and the lifting mechanism, when the curtain is unfolded, the controller can adjust the rotating speed of the lifting motor and the winding motor, thereby ensuring the flatness of the curtain during the lifting process. In addition, when the controller controls the lifting motor to rotate according to the determined rotating speed, the lifting frame can be ensured to ascend at a constant speed, thereby ensuring the curtain to ascend at a constant speed. In this way, the synchronization between the startup picture of the projection device and the lifting of the curtain can be more effectively ensured. In addition, after the lifting motor stops, the inclination of the cross beam can be detected through the inclination sensor, and then the controller can be adjusted to further ensure the flatness of the curtain and improve the display effect of the picture on the curtain.

[0153] The above merely describes illustrative embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A projection device, characterized by The projection device comprises: an optical engine for emitting a light beam; a projection screen comprising a base, a curling mechanism, a lifting mechanism, a curtain and a controller; the curling mechanism is limited on the base, a first side of the curtain is fixedly connected with the curling mechanism, the curling mechanism can control the curtain to curl to fold the curtain; the curling mechanism comprises a curling motor and a second Hall sensor, the second Hall sensor is installed on the curling motor, and the second Hall sensor is used for detecting the rotation angle of the curling motor; the rotation angle of the curling motor detected by the second Hall sensor is a second rotation angle; the lifting mechanism comprises a plurality of lifting assemblies and a cross beam, each lifting assembly comprises a lifting frame, a lifting motor, a speed reduction gear set and a first Hall sensor, the first Hall sensor is fixed on the lifting motor, and the first Hall sensor is used for detecting the rotation angle of the lifting motor; the rotation angle of the lifting motor detected by the first Hall sensor is a first rotation angle; a first end of the lifting frame is rotatably connected with the base, a second end of the lifting frame is rotatably connected with the cross beam, the speed reduction gear set is connected with the lifting motor and the lifting frame respectively, and a second side of the curtain is fixedly connected with the cross beam; and the lifting motor and the speed reduction gear set are fixed on the base, and the speed reduction gear set is fixedly connected with the first end of the lifting frame; the controller is electrically connected with the lifting motor, the controller is used for adjusting the rotating speed of the lifting motor, the lifting motor can drive the lifting frame to lift or lower through the speed reduction gear set, the lifting frame supports the cross beam when the lifting frame is lifted to unfold the curtain, the curtain receives the light beam when the curtain is unfolded, and the first side is opposite to the second side; wherein the first Hall sensor is electrically connected with the controller, and the second Hall sensor is electrically connected with the controller; after the controller controls the lifting frame to rise based on the rotating speed of the lifting motor, the controller acquires the first rotation angle and the second rotation angle; the controller determines a first lifting height based on the first rotation angle, and determines a second lifting height based on the second rotation angle; when the difference between the first lifting height and the second lifting height is greater than a difference threshold value, the controller adjusts the rotating speed of the lifting motor or the curling motor until the difference between the first lifting height and the second lifting height is less than or equal to the difference threshold value.

2. The projection apparatus according to claim 1, wherein the speed reduction gear set comprises a driving wheel, a driven wheel and a driving wheel; the driving wheel, the driven wheel and the driving wheel are rotatably supported on the base, and the driving wheel, the driven wheel and the driving wheel are engaged in sequence; the driving wheel is connected with the output shaft of the lifting motor, the lifting motor can drive the driving wheel to rotate, the driving wheel is fixedly connected with the first end of the lifting frame, and the axial direction of the driving wheel is perpendicular to the plane where the lifting frame is located.

3. The projection apparatus of claim 2, wherein the axial direction of the driving wheel is parallel to the axial direction of the lifting motor.

4. The projection apparatus of claim 3, wherein The driving wheel is connected with the output shaft of the lifting motor through a transmission belt.

5. The projection apparatus of claim 3, wherein The driving wheel is fixedly connected with the output shaft of the lifting motor.

6. The projection apparatus of claim 2, wherein The axial direction of the driving wheel is perpendicular to the axial direction of the lifting motor.

7. The projection apparatus of claim 6, wherein The speed reduction gear set further comprises a worm wheel and a worm gear. The worm wheel is rotatably supported on the base, one end of the worm gear is fixedly connected with the output shaft of the lifting motor, and the worm gear is engaged with the worm wheel. The driving wheel is fixedly connected with the worm gear, and the axial direction of the driving wheel coincides with the axial direction of the worm gear.

8. The projection apparatus of any of claims 1-7, wherein, Each set of lifting assembly further comprises a speed reduction box, and the speed reduction gear set is located in the speed reduction box.

9. The projection apparatus of claim 1, wherein The lifting mechanism further comprises an inclination sensor fixed on the cross beam, the inclination sensor is electrically connected with the controller, and the inclination sensor is used to detect the inclination of the cross beam.

10. A curtain rising control method characterized by comprising: The method is applied to the projection device of any one of claims 1-9, and the method comprises: When the controller receives a lifting instruction, the controller controls the lifting motor to start, and the lifting instruction is used to instruct the controller to control the lifting motor to lift the lifting frame; The controller determines the rotation speed of the lifting motor and generates lifting information of the lifting motor at the same time, the lifting information comprises the rotation speed or the starting duration of the lifting motor; When the lifting information meets a preset condition, the controller controls the lifting motor to rotate based on the rotation speed; When the lifting information does not meet the preset condition, the controller controls the lifting motor to stop.

11. The method of claim 10, wherein, The lifting mechanism further comprises an inclination sensor, and after the controller controls the lifting motor to stop, the controller further comprises: The controller acquires the inclination detected by the inclination sensor; When the inclination is greater than an angle threshold, the controller determines a lifting distance and an inclination direction of the cross beam based on the inclination; The controller determines a third rotation angle based on the lifting distance and determines a target lifting motor based on the inclination direction; The controller controls the target lifting motor to rotate based on the third rotation angle.

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