CN212675353U

CN212675353U - Projection device

Info

Publication number: CN212675353U
Application number: CN202021324182.5U
Authority: CN
Inventors: 杨长明; 陈友才
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2020-04-26
Filing date: 2020-07-07
Publication date: 2021-03-09
Anticipated expiration: 2030-07-07
Also published as: CN113641070A; CN115877648A; CN113641071A; CN212675352U; CN113641072A; CN113641070B

Abstract

The embodiment of the application discloses projection equipment, and belongs to the technical field of projection. The projection device includes: an optical engine and a projection screen; the projection screen comprises a base, a control mechanism, a screen, a guide roller, a transmission mechanism and a driving motor; the control mechanism is fixed on the base and used for supporting the curtain sheet; the base has two first guide ways of opposite position, and the both ends of guide roll are located two first guide ways respectively, and drive mechanism is rotatable spacing on the base, and driving motor fixes on the base, and driving motor's output shaft and drive mechanism are connected, and drive mechanism still is connected with the guide roll. In the embodiment of this application, driving motor can drive the guide roll through drive mechanism and remove in first guide way, and the guide roll can promote the curtain piece like this to reach the purpose of injecing the every single move angle of curtain piece, and then can correct the position of curtain piece, the picture of avoiding showing on the curtain piece distortion, fuzzy distortion scheduling problem appear, thereby improves projection screen's display effect.

Description

Projection device

The embodiments of the present application claim priority from chinese patent application No. 202010340787.1 entitled "projection device" filed on 26/4/2020, which is incorporated by reference in its entirety.

Technical Field

The embodiment of the application relates to the technical field of projection, in particular to projection equipment.

Background

With the continuous development of science and technology, projection equipment is more and more applied to the work and the life of people. Currently, a projection device mainly includes an optical engine and a projection screen. The light outlet side of the optical engine faces the projection screen to emit light beams to the projection screen, and the projection screen is used for receiving the light beams and displaying pictures.

In the related art, as shown in fig. 1, a projection screen 1 includes a curtain sheet 11, a curling assembly 12, a lifting assembly 13, and a base 14. The curling component 12 is fixed on the base 14, the curtain sheet 11 is fixedly connected with the curling component 12, and meanwhile, the curtain sheet 11 is also fixedly connected with one end of the lifting component 13 far away from the curling component 12. The lifting assembly 13 and the rolling assembly 12 can control the rolling and rolling of the curtain sheet 11. Wherein, lifting unit 13 includes the multiunit support, and every group support includes first bracing piece 131 and second bracing piece 132, between the first end of first bracing piece 131 and base 14, between the second end of first bracing piece 131 and the first end of second bracing piece 132 to and these three freely movable joint department are rotatable coupling between the second end of second bracing piece 132 and the curtain 11, and multiunit support can control the curtain 11 and expand.

However, since the three joints are reserved with assembly gaps, when the lifting assembly 13 is lifted to unfold the curtain sheet 11, the lifting assembly 13 is easily inclined due to the assembly gaps reserved at the three joints under the reverse acting force of the curtain sheet 11. In addition, the three joints are subject to wear, further increasing the tilt of the lift assembly 13. Thus, after the lifting assembly is tilted, the screen 11 is also tilted, which causes problems such as distortion and blurring distortion of the image displayed on the screen 11, thereby affecting the display effect of the projection screen 1.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a projection device, which can solve the problem that a curtain sheet included in the projection device is easy to incline. The technical scheme is as follows:

a projection device, the projection device comprising:

an optical engine to emit a light beam;

the projection screen comprises a base, a control mechanism, a screen, a guide roller, a transmission mechanism and a driving motor;

the control mechanism is fixed on the base and used for supporting the curtain sheet, and the curtain sheet is used for receiving the light beam when being supported;

the base has two first guide ways that the position is relative, the both ends of guide roll are located two respectively in the first guide way, drive mechanism is rotatable spacing on the base, driving motor fixes on the base, driving motor's output shaft with drive mechanism connects, drive mechanism still with the guide roll is connected, driving motor can pass through drive mechanism drives the guide roll is in first guide way removes, with compress tightly on the curtain piece, and inject the every single move angle of curtain piece.

Optionally, the transmission comprises a worm and a worm gear;

the length direction of the worm is parallel to the length direction of the first guide groove, the worm is rotatably limited on the base, the worm is connected with an output shaft of the driving motor, and the driving motor can drive the worm to rotate along the circumferential direction of the driving motor;

the worm wheel is limited at the first end of the guide roller along the axial direction, and the worm is meshed with the worm wheel.

Optionally, the axial direction of the output shaft of the driving motor is collinear with the length direction of the worm, and the output shaft of the driving motor is fixedly connected with the end of the worm.

Optionally, the transmission mechanism further includes a first gear and a second gear, the first gear is fixedly connected to the output shaft of the driving motor along the axial direction, the second gear is fixedly connected to one end of the worm along the axial direction, and the first gear is engaged with the second gear.

Optionally, an axial direction of an output shaft of the driving motor is parallel to a length direction of the worm rod, and the first gear and the second gear are both cylindrical gears.

Optionally, an axial direction of an output shaft of the driving motor is perpendicular to a length direction of the worm rod, and the first gear and the second gear are both bevel gears.

Optionally, the transmission mechanism comprises a lead screw;

the length direction of the lead screw is parallel to that of the first guide groove, the lead screw is rotatably limited on the base, and the lead screw is in threaded connection with the first end of the guide roller;

the output shaft of the driving motor is connected with the lead screw, and the driving motor can drive the lead screw to rotate.

Optionally, the transmission mechanism further includes a third gear and a rack, the third gear is axially limited at the second end of the guide roller, the rack is fixed on the base, and the length direction of the rack is parallel to the length direction of the first guide groove and is meshed with the third gear.

Optionally, the length direction of the first guide groove is a horizontal direction.

Optionally, the control mechanism comprises a crimping assembly and a lifting assembly;

the curling assembly is limited on the base, the first side edge of the curtain sheet is fixedly connected with the curling assembly, and the curling assembly can rotate along the circumferential direction of the curling assembly to control the curtain sheet to be retracted;

the first end of the lifting assembly is fixedly connected with the base, the second end of the lifting assembly is fixedly connected with the second side edge opposite to the first side edge of the curtain sheet, and the lifting assembly can control the curtain sheet to be unfolded.

The technical scheme provided by the embodiment of the application has the beneficial effects that at least:

when the control mechanism supports the curtain sheet, the driving motor can drive the transmission mechanism to operate so as to realize the automatic control of the transmission mechanism, and then the transmission mechanism is convenient to drive the guide roller to move. Because the guide roller can move in the first guide groove, after the guide roller is contacted with the curtain sheet and continuously moves in the first guide groove, the curtain sheet can be pushed and pressed on the curtain sheet so as to limit the pitching angle of the curtain sheet. Therefore, the position of the screen can be corrected through the guide roller, and the problems of distortion, fuzzy distortion and the like of the picture displayed on the screen can be avoided, so that the display effect of the projection screen is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a partially enlarged structural schematic view of a projection screen provided in the related art;

FIG. 2 is a schematic diagram of a side view of a projection screen provided in the related art;

FIG. 3 is a schematic diagram of a side view of another projection screen provided in the related art;

FIG. 4 is a schematic structural diagram of a projection apparatus provided in an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a transmission mechanism provided in an embodiment of the present application;

FIG. 6 is a schematic structural diagram of another transmission mechanism provided in the embodiments of the present application;

FIG. 7 is a schematic structural diagram of another transmission mechanism provided in the embodiments of the present application;

FIG. 8 is an exploded view of another actuator according to an embodiment of the present application;

FIG. 9 is a schematic structural diagram of another transmission mechanism provided in the embodiments of the present application;

FIG. 10 is a schematic structural diagram of a projection screen provided in an embodiment of the present application;

FIG. 11 is a schematic diagram of a side view of a projection screen according to an embodiment of the present disclosure;

FIG. 12 is a schematic diagram of a side view structure of a projection screen according to an embodiment of the present disclosure;

FIG. 13 is a schematic diagram of a side view of another projection screen according to an embodiment of the present disclosure;

fig. 14 is a schematic structural diagram of a projection apparatus according to an embodiment of the present application.

Reference numerals:

the related technology comprises the following steps:

1: a projection screen; 11: a screen sheet; 12: a crimping assembly; 13: a lifting assembly; 14: a base;

131: a first support bar; 132: a second support bar; 133: and (7) connecting the shafts.

The embodiment of the application:

1: an optical engine; 2: a projection screen; 3: a storage section;

21: a base; 22: a control mechanism; 23: a screen sheet; 24: a guide roller; 25: a transmission mechanism; 26: a drive motor; 31: a light-transmitting region; 32: an opening;

211: a first guide groove; 221: a crimping assembly; 222: a lifting assembly; 251: a worm; 252: a worm gear; 253: a first gear; 254: a second gear; 255: a lead screw; 256: a third gear; 257: a rack; 258: a nut; 259: a shaft sleeve;

2510: a guide shaft; 2511: a fourth gear; 2512: a fifth gear; 2221: a cross beam; 2222: a first support bar; 2223: a second support bar.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the following will explain the situations of the curtain sheet being cut or twisted, etc. in conjunction with the related art.

In the related art, as for the plurality of sets of brackets included in the lifting assembly 13, as shown in fig. 1, each set of bracket further includes a connecting shaft 133; the second end of the first support rod 131 is provided with a first connection groove, the first end of the second support rod 132 extends into the first connection groove, and the second end of the first support rod 131 and the first end of the second support rod 132 are rotatably connected through a connection shaft 133. Wherein, the two groove walls of the first connecting groove and the side wall of the first end of the second supporting rod 132 are both provided with a connecting hole, and the connecting shaft 133 passes through the connecting holes on the two groove walls and the connecting hole on the second supporting rod 132 to realize the rotatable connection of the first supporting rod 131 and the second supporting rod 132.

Normally, a fitting clearance is provided between the hole wall of the connection hole on the groove wall and the connection shaft 133. Illustratively, the clearance between the hole wall of the connection hole on the groove wall and the connection shaft 133 is less than or equal to 0.2 mm. Thus, the second supporting rod 132 is easily inclined under the action of external force, so that the relative position relationship between the second end of the first supporting rod 131 and the first end of the second supporting rod 132 is changed, and an included angle is formed between the straight line of the central points of the two connecting holes in the first connecting groove and the axial direction of the connecting shaft 133. Further, when the second support rod 132 is tilted, the curtain sheet 11 is also tilted forward or backward.

Wherein, the angle at which the second supporting rod 132 inclines is equal to the included angle between the straight line at the central points of the two connecting holes on the first connecting groove and the axial direction of the connecting shaft 133, and the maximum included angle between the straight line at the central points of the two connecting holes on the first connecting groove and the axial direction of the connecting shaft 133 is calculated according to the following formula:

α＝tan^-1D/B

wherein α is a maximum included angle between a straight line where center points of two connection holes on the first connection groove are located and an axial direction of the connection shaft 133, D is a gap between a hole wall of the connection hole and the connection shaft 133, and B is a distance between two groove walls of the first connection groove.

It should be noted that, since the position of the curling element 12 is fixed, the position of the side of the curtain sheet 11 connected to the curling element 12 does not change. As shown in fig. 2, the second support rods 132 included in the plurality of sets of brackets may be inclined away from the curtain sheet 11, so that one side of the curtain sheet 11 connected to the plurality of sets of brackets is tilted backwards, thereby causing the curtain sheet 11 to tilt backwards; as shown in fig. 3, the second support rods 132 included in the plurality of sets of brackets may also tilt close to the curtain sheet 11, so that one side of the curtain sheet 11 connected to the plurality of sets of brackets tilts forward, thereby causing the curtain sheet 11 to tilt forward.

It should be noted that the contact portions between the first support rod 131 and the connecting shaft 133, the contact portions between the first support rod 131 and the second support rod 132, and the contact portions between the second support rod 132 and the connecting shaft 133 are all prone to wear, so that the forward tilting or backward tilting degree of the curtain sheet 11 is further increased.

Based on the above description, in the related art, there is a problem that the screen 11 included in the projection screen 1 is prone to tilt forward or backward, so that the screen 11 cannot normally receive the light beam emitted from the optical engine, and thus the displayed image is distorted and blurred.

Embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Fig. 4 illustrates a schematic structural diagram of a projection device according to an embodiment of the present application, and fig. 5 illustrates a schematic structural diagram of a transmission mechanism according to an embodiment of the present application. As shown in fig. 4 and 5, the projection apparatus includes: an optical engine 1 and a projection screen 2, the optical engine 1 is used for emitting light beams; the projection screen 2 comprises a base 21, a control mechanism 22, a curtain sheet 23, a guide roller 24, a transmission mechanism 25 and a driving motor 26; the control mechanism 22 is fixed on the base 21, the control mechanism 22 is used for supporting the curtain sheet 23, and the curtain sheet 23 is used for receiving the light beam when being supported; the base 21 is provided with two first guide grooves 211 opposite in position, two ends of the guide roller 24 are respectively located in the two first guide grooves 211, the transmission mechanism 25 is rotatably limited on the base 21, the driving motor 26 is fixed on the base 21, an output shaft of the driving motor 26 is connected with the transmission mechanism 25, the transmission mechanism 25 is further connected with the guide roller 24, and the driving motor 26 can drive the guide roller 24 to move in the first guide grooves 211 through the transmission mechanism 25 so as to be pressed on the curtain sheet 23 and limit the pitching angle of the curtain sheet 23.

In the embodiment of the present application, when the control mechanism 22 supports the curtain sheet 23, the driving motor 26 can drive the transmission mechanism 25 to operate so as to realize automatic control of the transmission mechanism 25, thereby facilitating the transmission mechanism 25 to drive the guide roller 24 to move. Since the guide roller 24 can move in the first guide groove 211, after the guide roller 24 contacts the curtain sheet 23 and continues to move in the first guide groove 211, the curtain sheet 23 can be pushed and pressed against the curtain sheet 23 to define the pitch angle of the curtain sheet 23. Thus, the position of the screen sheet 23 can be corrected by the guide roller 24, and the problems of distortion, blurring distortion, and the like of the picture displayed on the screen sheet 23 can be avoided, thereby improving the display effect of the projection screen 2.

It should be noted that the projection screen 2 further includes a control system, and the control system is electrically connected to the driving motor 26. When the position of the curtain sheet 23 needs to be corrected, the control system sends a start instruction to the driving motor 26 to control the driving motor 26 to start operating, and then the driving motor 26 drives the guide roller 24 to move through the transmission mechanism 25 to adjust the pitch angle of the curtain sheet 23. When the pitch angle of the curtain sheet 23 is adjusted to the target pitch angle, the control system sends a stop command to the driving motor 26 to control the driving motor 26 to stop operating, and the transmission mechanism 25 stops moving. In this way, the guide roller 24 can maintain a state of being pressed against the curtain sheet 23, and thereby the pitch angle of the curtain sheet 23 can be defined. Therefore, the control system can control the start and stop of the driving motor 26 according to the actual position condition of the curtain sheet 23, and further can ensure the accuracy of the movement amount of the guide roller 24. The target pitch angle of the curtain sheet 23 is an included angle between a plane where the curtain sheet 23 is located and a vertical straight line under the condition that the curtain sheet 23 does not unnecessarily incline. Illustratively, the target pitch angle of the curtain sheet 23 is 0 degrees, 5 degrees, or the like.

Wherein, the base 21 is used for being fixedly connected with the supporting body to fix the projection screen 2. The supporting body is a supporting surface of the fixing support or a wall surface of the wall body, and in other embodiments, the supporting body is a supporting cabinet or a table top, as long as the fixing support of the projection screen 2 can be realized.

Alternatively, the optical engine 1 is an ultra-short focus optical engine, so that the distance from the optical engine 1 to the plane of the projection screen 2 is set to be a short distance to achieve a compact design of the entire laser projection apparatus. The optical engine 1 includes a light source, an optical-mechanical system and a lens, the optical-mechanical system includes a DMD (Digital Micromirror array) board and a DMD, the light source is used for emitting a light beam to the optical-mechanical system, the DMD board included in the optical-mechanical system is used for providing a driving signal to the DMD, so that the DMD can modulate the light beam emitted from the light source based on the driving signal, emit the modulated light beam to the lens, and emit the light beam to the projection screen 2 through the lens for displaying.

Optionally, in this embodiment of the present application, the projection apparatus is a laser ultra-short focus projection apparatus, the ultra-short focus optical engine is a DLP (Digital Light processing) projection optical engine, and the optical engine 1 includes a lens that is an ultra-short focus projection lens. And, the screen 23 of the projection screen 2 is an optical screen 23, such as a rollable fresnel optical screen, or may also be a flexible black screen, such an optical screen 23 has a higher optical gain compared to the conventional screen, can reduce the brightness and contrast of the light beam as much as possible, and can realize a higher flatness by controlling and stretching the control mechanism 22, and can be suitable for the application of ultra-short focus projection imaging.

In some embodiments, as shown, the guide rollers 24 are elongated to facilitate lengthwise compression against the curtain sheet 23 to provide a wide range of restraint for the curtain sheet 23. Of course, the guide roller 24 may have another shape as long as it can press the curtain sheet 23 and define the pitch angle of the curtain sheet 23.

Wherein the guide roller 24 has a circular or polygonal cross-sectional shape. The guide roller 24 having a circular cross-sectional shape is convenient to process, and the surface of the guide roller 24 is smooth and less likely to cause damage to the curtain sheet 23. The guide roller 24 having a polygonal cross-sectional shape is strong in stability and is not liable to shake. When the guide roller 24 has a polygonal cross section, the cross-sectional shape is, for example, a square, a hexagon, or other shapes.

In some embodiments, the base 21 includes two support plates, and the two first guide grooves 211 are respectively provided on the two support plates, so that both ends of the guide roller 24 can be easily inserted through the two first guide grooves 211, respectively.

The shape of the first guide groove 211 is a long strip or an oval, but may be other shapes as long as the guide roller 24 can move in the first guide groove 211. The width of the first guide groove 211 is slightly larger than the diameter or the side length of the cross section of the guide roller 24. Thus, the guide roller 24 can move more flexibly in the first guide groove 211. The length of the first guide groove 211 is set according to the limit inclination amount of the curtain sheet 23 along the length direction of the first guide groove 211, and the length of the first guide groove 211 is slightly larger than the limit inclination amount of the curtain sheet 23 along the length direction of the first guide groove 211, so that when the guide roller 24 defines the pitch angle of the curtain sheet 23, the interference to the guide roller 24 is avoided.

In some embodiments, the length direction of the first guide groove 211 is a horizontal direction or a direction forming an acute angle with the horizontal direction. Illustratively, when the guide roller 24 moves in the first guide groove 211, there is a moving component in the horizontal direction, so that the curtain sheet 23 can be pressed or pushed in the horizontal direction, and the included angle between the curtain sheet 23 and the vertical direction can be adjusted or eliminated, thereby realizing the limitation of the pitch angle of the curtain sheet 23 when the guide roller 24 is pressed on the curtain sheet 23.

Note that, the target pitch angle of the curtain sheet 23 is set according to the angle of the light beam emitted from the optical engine 1 or other factors, and the angle of the first guide groove 211 is set according to the target pitch angle of the curtain sheet 23, as long as the guide roller 24 that can move in the longitudinal direction of the first guide groove 211 can limit the pitch angle of the curtain sheet 23 to the target pitch angle, which is not limited in the embodiment of the present application.

In some embodiments, a lubricating member closely attached to the inner wall of each first guide groove 211 is provided on the inner wall of each first guide groove 211, so that friction between the guide roller 24 and the first guide groove 211 can be reduced, smoothness of movement of the guide roller 24 in the first guide groove 211 can be enhanced, and improvement of movement accuracy of the guide roller 24 can be facilitated.

In the embodiment of the present application, the transmission mechanism 25 is the transmission mechanism 25 including the worm wheel 252 and the worm 251, or the transmission mechanism 25 including the lead screw 255, but may be another transmission mechanism 25 as long as the guide roller 24 can be driven to move in the first guide groove 211. When the transmission mechanism 25 is a transmission mechanism 25 including a worm wheel 252 and a worm 251, the axial direction of the output shaft of the driving motor 26 and the length direction of the worm 251 are collinear, parallel and perpendicular, or the included angle between the two forms an acute angle; when the transmission mechanism 25 is a transmission mechanism 25 including a lead screw 255, the axial direction of the output shaft of the drive motor 26 and the longitudinal direction of the lead screw 255 may be collinear, parallel, perpendicular, or an acute angle therebetween.

The transmission 25 including the worm wheel 252 and the worm 251 will be described in detail.

In some embodiments, as shown in fig. 5, the transmission 25 includes a worm 251 and a worm gear 252; the length direction of the worm 251 is parallel to the length direction of the first guide groove 211, the worm 251 is rotatably limited on the base 21, the worm 251 is connected with an output shaft of the driving motor 26, and the driving motor 26 can drive the worm 251 to rotate along the circumferential direction of the driving motor 26; the worm wheel 252 is axially restrained at a first end of the guide roller 24, and the worm 251 is engaged with the worm wheel.

In this way, after the driving motor 26 is started, the worm 251 can be driven to rotate, and the worm gear 251 drives the worm wheel 252 meshed with the worm 251 to roll along the length direction of the worm 251, and the worm wheel 252 is limited at the first end of the guide roller 24 along the axial direction, so that the worm wheel 252 can drive the guide roller 24 to generate a movement amount along the length direction of the worm 251 during rolling, and further, the length direction of the worm 251 is parallel to the length direction of the first guide groove 211, so that the guide roller 24 can be ensured to generate a movement amount along the length direction of the first guide groove 211 at the same time.

Optionally, two position-limiting sleeves are fixed on the base 21, the two position-limiting sleeves are respectively sleeved on two sides of the spiral teeth of the worm 251, and the two position-limiting sleeves and the worm 251 can rotate. Thus, the two stop collars can support the worm 251 and can ensure that the worm 251 rotates in the circumferential direction of the worm 251. Illustratively, the contact portion between the worm 251 and the stop collar is provided with lubricating oil to ensure flexibility of the worm 251 during rotation.

Optionally, the worm wheel 252 is fixedly connected to the first end of the guide roller 24, so that when the worm wheel 252 rolls, the guide roller 24 can be driven to roll together, and the fixed connection between the worm wheel 252 and the guide roller 24 can realize smooth transmission of force. Of course, in other embodiments, the worm wheel 252 is rotatably limited to the first end of the guide roller 24, so that the worm wheel 252 is rotatably connected to the guide roller 24, so that the guide roller 24 can keep translating when the worm wheel 252 rolls along the length direction of the worm 251.

Next, in the case where the transmission mechanism 25 includes the worm 251 and the worm wheel 252, a description will be given of a relative position between the axial direction of the output shaft of the drive motor 26 and the longitudinal direction of the worm 251.

In some embodiments, the axial direction of the output shaft of the driving motor 26 is collinear with the length direction of the worm 251, and the output shaft of the driving motor 26 is fixedly connected with the end of the worm 251. Thus, when the driving motor 26 is started, the output shaft rotates to drive the worm 251 fixedly connected therewith to rotate together.

Alternatively, the output shaft of the driving motor 26 is fixedly connected with the end of the worm 251 through a coupling, but may be fixedly connected in other manners.

In other embodiments, as shown in fig. 5, the axial direction of the output shaft of the driving motor 26 is parallel to the length direction of the worm 251. Optionally, the transmission mechanism 25 further includes a first gear 253 and a second gear 254, the first gear 253 is fixedly connected to the output shaft of the driving motor 26 along the axial direction, the second gear 254 is fixedly connected to one end of the worm 251 along the axial direction, and the first gear 253 is meshed with the second gear 254. In the present embodiment, the first gear 253 and the second gear 254 are both cylindrical gears. Thus, when the driving motor 26 is started, the first gear 253 rotates the second gear 254 engaged with the first gear 253, and the second gear 254 rotates the worm 251. Further, since the first gear 253 and the second gear 254 are both cylindrical gears, the axial direction of the first gear 253 is parallel to the axial direction of the second gear 254, so as to accommodate a case where the axial direction of the output shaft of the drive motor 26 is parallel to the longitudinal direction of the worm 251.

Optionally, the first gear 253 and the second gear 254 are both spur gears, which have strong bearing capacity and are convenient for processing and production. In some embodiments, the first gear 253 and the second gear 254 are helical gears, so that the gears have good meshing performance, operate smoothly, and ensure a more constant transmission ratio.

In still other embodiments, the axial direction of the output shaft of the drive motor 26 is perpendicular to the length direction of the worm 251. Accordingly, the transmission mechanism 25 includes the first gear 253 and the second gear 254 in the above-described embodiment, wherein the first gear 253 and the second gear 254 are both bevel gears. In this way, the bevel gear enables transmission between two shafts perpendicular to each other.

Alternatively, the first gear 253 and the second gear 254 are both straight bevel gears, which have the same or similar advantages as the straight spur gears described above. In some embodiments, the first gear 253 and the second gear 254 are helical bevel gears, and the advantages thereof are the same as or similar to those of the helical cylindrical gears, and thus the description thereof is omitted in this embodiment of the present application.

In still other embodiments, the axial direction of the output shaft of the driving motor 26 is at any acute angle with the length direction of the worm 251, and accordingly, the transmission mechanism 25 includes the first gear 253 and the second gear 254 in the above embodiments, wherein the first gear 253 and the second gear 254 are both bevel gears. In this way, the parameters of the hammer gear are selected according to actual conditions to adapt to the included angle between the axial direction of the output shaft of the driving motor 26 and the length direction of the worm 251.

It should be noted that, because the space environment of the projection screen 2 is different, the fixing position of the driving motor 26 and the axial direction of the output shaft of the driving motor 26 are adaptively adjusted according to the space environment of the projection screen 2, accordingly, the position relationship between the axial direction of the output shaft of the driving motor 26 and the length direction of the worm 251 is adaptively changed, and the types of the first gear 253 and the second gear 254 may be selected from the types in any of the above embodiments.

The drive mechanism 25 including the lead screw 255 will be described in detail below.

In some embodiments, as shown in fig. 6, the transmission mechanism 25 includes a lead screw 255; the length direction of the lead screw 255 is parallel to the length direction of the first guide groove 211, the lead screw 255 is rotatably limited on the base 21, and the lead screw 255 is in threaded connection with the first end of the guide roller 24; an output shaft of the driving motor 26 is connected to the lead screw 255, and the driving motor 26 can drive the lead screw 255 to rotate.

In this way, the driving motor 26 can drive the lead screw 255 to rotate after being started, and further the lead screw 255 drives the guide roller 24 in threaded connection with the lead screw to move along the length direction of the lead screw 255 when rotating, and because the length direction of the lead screw 255 is parallel to the length direction of the first guide groove 211, the guide roller 24 can be ensured to simultaneously move along the length direction of the first guide groove 211, and further the guide roller 24 can move towards the curtain sheet 23 and be pressed on the curtain sheet 23.

In some embodiments, the first end of the guide roller 24 has a threaded hole through which one end of the lead screw 255 is threaded for connection with the guide roller 24. In this way, the guide roller 24 can be screwed to the lead screw 255 based on its own screw hole.

Optionally, the transmission mechanism 25 further includes a guide shaft, the guide shaft is limited on the base 21, and the length direction of the guide shaft is parallel to the length direction of the lead screw 255, accordingly, the guide roller 24 has a guide hole, the guide shaft passes through the guide hole, and the length of the guide shaft is greater than the length of the guide hole. In this way, when the guide roller 24 moves along the length direction of the lead screw 255, the guide shaft can perform guiding and limiting functions to improve the moving accuracy of the guide roller 24, and at the same time, avoid unnecessary shaking of the guide roller 24.

In other embodiments, as shown in fig. 6, the transmission mechanism 25 further includes a nut 258, the nut 258 is limited at the first end of the guide roller 24, and one end of the lead screw 255 is in threaded connection with the nut 258. In this way, the guide roller 24 can be screwed to the threaded spindle 255 by means of the nut 258. In addition, for the lead screw 255 of different specifications, the nut 258 of the corresponding different specification can be replaced, so that the guide roller 24 can be used in cooperation with the lead screw 255 of different specifications.

Optionally, as shown in fig. 7, the transmission mechanism 25 further includes a bushing 259, the bushing 259 is sleeved on the first end of the guide roller 24, and the nut 258 is fixedly connected with the bushing 259. In this way, the slider can be connected to the guide roller 24 based on the sleeve 259. The shaft sleeve 259 is fixedly connected to the first end of the guide roller 24 to achieve smooth transmission of the acting force between the shaft sleeve 259 and the guide roller 24, and of course, the shaft sleeve 259 may also be rotatably connected to the first end of the guide roller 24, which is not limited in this embodiment of the application.

Alternatively, as shown in fig. 8, when the transmission mechanism 25 includes the guide shaft 2510, the side wall of the nut 258 has a protrusion having a guide hole through which the guide shaft 2510 passes, and the length of the guide shaft 2510 is greater than the length of the guide hole. In this way, when the nut 258 moves along the length direction of the lead screw 255, the guide shaft 2510 can play a role in guiding and limiting, so as to improve the moving precision of the nut 258 and avoid unnecessary shaking of the nut 258.

Optionally, the transmission mechanism 25 further includes balls, the nut 258 has a loop communicated with the internal thread, the balls are arranged in a spiral space and a loop formed by the nut 258 and the screw 255, and the balls can roll circularly in the spiral space and the loop when the nut 258 moves along the length direction of the screw 255. In this way, the balls reduce friction between the screw 255 and the nut 258, thereby enhancing flexibility in moving the nut 258 relative to the screw 255.

Next, when the transmission mechanism 25 includes the lead screw 255, the relative position between the axial direction of the output shaft of the drive motor 26 and the longitudinal direction of the lead screw 255 will be described.

In some embodiments, the axial direction of the output shaft of the driving motor 26 is collinear with the length direction of the lead screw 255, and the output shaft of the driving motor 26 is fixedly connected with the end of the lead screw 255. The connection mode between the driving motor 26 and the lead screw 255 is the same as or similar to the connection mode between the driving motor 26 and the worm 251, and details thereof are not repeated in this embodiment of the application.

In other embodiments, as shown in FIG. 6, the axial direction of the output shaft of the drive motor 26 is parallel to the length of the lead screw 255. Optionally, the transmission mechanism 25 further includes a fourth gear 2511 and a fifth gear 2512, the fourth gear 2511 is fixedly connected to the output shaft of the driving motor 26 along the axial direction, the fifth gear 2512 is fixedly connected to one end of the lead screw 255 along the axial direction, and the fourth gear 2511 is engaged with the fifth gear 2512. In this embodiment, the fourth gear 2511 and the fifth gear 2512 are both cylindrical gears. Thus, when the driving motor 26 is started, the fourth gear 2511 is rotated, the fourth gear 2511 rotates the fifth gear 2512 engaged therewith, and the fifth gear 2512 rotates the screw 255. Further, since the fourth gear 2511 and the fifth gear 2512 are both cylindrical gears, the axial direction of the fourth gear 2511 is parallel to the axial direction of the fifth gear 2512 so as to accommodate a case where the axial direction of the output shaft of the drive motor 26 is parallel to the longitudinal direction of the lead screw 255.

In still other embodiments, the axial direction of the output shaft of the drive motor 26 is perpendicular to the length direction of the lead screw 255. Accordingly, the transmission mechanism 25 includes the fourth gear 2511 and the fifth gear 2512 in the above-described embodiments, wherein the fourth gear 2511 and the fifth gear 2512 are both bevel gears. In this way, the bevel gear enables transmission between two shafts perpendicular to each other.

In still other embodiments, the axial direction of the output shaft of the driving motor 26 is at any acute angle with the length direction of the lead screw 255, and accordingly, the transmission mechanism 25 includes the fourth gear 2511 and the fifth gear 2512 in the above embodiments, wherein the fourth gear 2511 and the fifth gear 2512 are both bevel gears. In this way, the parameters of the hammer gear are selected according to actual conditions to adapt to the included angle between the axial direction of the output shaft of the driving motor 26 and the length direction of the worm 251.

In the embodiment of the present application, in order to ensure the smoothness of the movement of the guide roller 24, in some embodiments, the second end of the guide roller 24 is also provided with a transmission mechanism 25. When the transmission mechanism 25 includes the worm 251 and the worm wheel 252, the worm wheel 252 is axially limited at the second end of the guide roller 24, and when the transmission mechanism 25 includes the lead screw 255, the lead screw 255 is threadedly coupled to the second end of the guide roller 24. In this way, the transmission mechanisms 25 are arranged at both ends of the guide roller 24, so that both ends of the guide roller 24 can be controlled to move synchronously, and the overall movement stability of the guide roller 24 is ensured. Correspondingly, the control system is connected with the two driving motors 26 respectively positioned at the two ends of the guide roller 24, the control system controls the two driving motors 26 to run synchronously, and then the two driving motors 26 can drive the guide roller 24 to move based on the two ends of the guide roller 24.

It should be noted that the two driving motors 26 may control the moving directions of the corresponding end portions of the guide rollers 24 to be the same or different, that is, one end of the guide roller 24 moves toward the curtain sheet 23, the other end of the guide roller 24 moves away from the curtain sheet 23, or both ends of the guide roller 24 move toward the curtain sheet 23 or move away from the curtain sheet 23; the two drive motors 26 may control the movement amounts of the corresponding end portions of the guide roller 24 to be the same or different. In this way, when the curtain sheet 23 swings left and right, the swing directions of the left and right sides of the curtain sheet 23 are different, and the swing amounts are also different, so that the start times and the forward and reverse rotations of the two driving motors 26 can be controlled correspondingly based on the different swing amounts and swing directions of the left and right sides of the curtain sheet 23, respectively, so that the two corresponding end portions of the guide roller 24 have different movement amounts and movement directions, and the correction of the left and right swing of the curtain sheet 23 in practice can be adapted.

In other embodiments, as shown in fig. 9, the transmission mechanism 25 further includes a third gear 256 and a rack 257, the third gear 256 is axially limited at the second end of the guide roller 24, the rack 257 is fixed on the base 21, and the length direction of the rack 257 is parallel to the length direction of the first guide groove 211 and is engaged with the third gear 256.

Thus, when the driving motor 26 drives the guide roller 24 to roll based on the first end of the guide roller 24 through the worm gear 252, the third gear 256 is fixedly connected to the second end of the guide roller 24, so that the guide roller 24 drives the third gear 256 fixed to the second end thereof to roll together, and the third gear 256 can roll along the longitudinal direction of the rack 257 engaged therewith. Since the longitudinal direction of the rack 257 is parallel to the longitudinal direction of the first guide groove 211, the third gear 256 can generate a displacement amount in the longitudinal direction of the first guide groove 211 while rolling in the longitudinal direction of the rack 257, and further, the third gear 256 can guide the guide roller 24 so that the second end of the guide roller 24 generates a displacement amount in the longitudinal direction of the first guide groove 211 in synchronization with the first end.

When the driving motor 26 drives the guide roller 24 to move based on the first end of the guide roller 24 through the lead screw 255, the third gear 256 is rotatably sleeved at the second end of the guide roller 24, and since the third gear 256 is also meshed with the rack 257, the third gear 256 sleeved at the second end of the guide roller 24 is driven to generate a movement amount together when the guide roller 24 moves, and meanwhile, the rack 257 causes the third gear 256 to roll along the length direction of the rack 257, and further, the third gear 256 can roll along the length direction of the rack 257 meshed with the third gear. Similarly, the third gear 256 enables the second end of the guide roller 24 to generate a displacement amount in the longitudinal direction of the first guide groove 211 in synchronization with the first end.

In some embodiments, as shown in fig. 10, control mechanism 22 includes a crimping assembly 221 and a lifting assembly 222; the curling assembly 221 is limited on the base 21, the first side edge of the curtain sheet 23 is fixedly connected with the curling assembly 221, and the curling assembly 221 can rotate along the circumferential direction of the curling assembly 221 so as to control the curtain sheet 23 to be retracted; the first end of the lifting assembly 222 is fixedly connected to the base 21, the second end of the lifting assembly 222 is fixedly connected to the second side of the curtain sheet 23 opposite to the first side, and the lifting assembly 222 can control the curtain sheet 23 to be unfolded. Thus, when the projection apparatus is used, the lifting assembly 222 stretches the curtain sheet 23 on the curling assembly 221 so that the curtain sheet receives the light beam emitted from the optical engine 1; when the projection device is not used, the curling assembly 221 can rotate along the circumferential direction of the curling assembly, and then the curtain sheet 23 is controlled to curl on the curling assembly 221 to achieve the retraction of the curtain sheet 23, so that the space occupied by the projection screen 2 is reduced.

In some embodiments, the back surface of the curtain sheet 23, that is, the surface of the curtain sheet 23 facing the control mechanism 22, is provided with a protective coating, so that the protective coating can prevent the back surface of the curtain sheet 23 from directly contacting the front surface of the curtain sheet 23 when the curtain sheet 23 is in a curled state, thereby preventing the back surface and the front surface of the curtain sheet 23 from rubbing against each other to cause abrasion of the curtain sheet 23, and thus prolonging the service life of the curtain sheet 23. The protective coating is a coating composed of flexible particles, or a colloidal coating, which is not limited in the embodiments of the present application. The protective coating is made of a nano material, the nano material has good toughness, impact resistance and thermal stability, and the flatness, wind resistance and stability of the curtain sheet 23 can be improved after the protective coating is contacted with the curtain sheet 23, and the service life of the curtain sheet 23 can be prolonged.

In some embodiments, the guide roller 24 is fixed and can rotate around its own circumference when pressing against the curtain sheet 23. Under the condition that the guide roller 24 can rotate, when the curling assembly 221 controls the curtain sheet 23 to curl or the lifting assembly 222 controls the curtain sheet 23 to unfold, the guide roller 24 can rotate, so that the friction force between the guide roller 24 and the curtain sheet 23 can be reduced, and the curtain sheet 23 is prevented from being damaged due to the friction generated between the guide roller 24 and the curtain sheet 23.

Of course, when the rolling assembly 221 controls the curtain sheet 23 to roll or the lifting assembly 222 controls the curtain sheet 23 to unfold, the guide roller 24 is controlled to be away from the curtain sheet 23 to prevent friction, so that the guide roller 24 and the curtain sheet 23 can be prevented from being in direct contact. Optionally, the guide roller 24 is controlled to move away from the curtain sheet 23 during the process of the lift assembly 222 expanding the curtain sheet 23. When the curtain sheet 23 is stretched over the control mechanism 22, the control guide roller 24 is pressed against the curtain sheet 23 to define the pitch angle of the curtain sheet 23. During the process of rolling the curtain sheet 23 by the rolling assembly 221, the guide roller 24 which is originally pressed against the curtain sheet 23 is removed to avoid friction caused by direct contact between the guide roller 24 and the curtain sheet 23. Further, when the projection screen 2 is used next time, the guide roller 24 is kept at the original position, and when the screen sheet 23 is again stretched on the control mechanism 22, the guide roller 24 is continuously controlled to be pressed against the screen sheet 23.

Note that, in order to realize that the guide roller 24 pressed against the curtain sheet 23 can rotate around its own circumferential direction, the guide roller 24 and the worm wheel 252, the guide roller 24 and the nut 258 included in the slider, or the guide roller 24 and the third gear 256 are all rotatably connected.

Of course, in some embodiments, the guide roller 24 is a roller-type guide roller 24, the roller-type guide roller 24 includes a central shaft and a roller, both ends of the central shaft are connected with the worm gear 252, the lead screw 255 or the third gear 256, and the roller is rotatably sleeved on the central shaft. In this way, the drum can rotate about the central axis. Wherein, the roller is a hollow cylindrical roller or a hollow prismatic roller.

In some embodiments, the guide roller 24 is provided with a protective coating, so that the protective coating can prevent the guide roller 24 from directly contacting the curtain sheet 23, thereby preventing the surface of the guide roller 24 from scratching the curtain sheet 23 due to unsmooth or the like when the curtain sheet 23 and the guide roller 24 move relatively, and prolonging the service life of the curtain sheet 23. Wherein, the protective coating is a coating or a colloidal coating consisting of flexible particles.

In some embodiments, as shown in fig. 10, when guide roller 24 is in a strip configuration, the length direction of guide roller 24 is parallel to the axial direction of crimping assembly 221. Thus, the curtain sheet 23 is pressed by the guide roller 24, so that the smoothness of the curtain sheet 23 can be ensured, and the phenomenon that the curtain sheet 23 is distorted due to the existence of the guide roller 24 can be avoided.

In some embodiments, as shown in fig. 11, when the intersection between the curtain sheet 23 and the curling assembly 221 is located between the first end and the second end of the lifting assembly 222 in the horizontal direction, the guide roller 24 presses the curtain sheet 23 on the side of the curtain sheet 23 near the lifting assembly 222. Thus, when the intersection line between the curtain sheet 23 and the curling assembly 221 is located between the first end and the second end of the lifting assembly 222, since the first side of the curtain sheet 23 is fixedly connected to the curling assembly 221 and the second side of the curtain sheet 23 is fixedly connected to the second end of the lifting assembly 222, the intersection line between the curtain sheet 23 and the curling assembly 221 is close to the first side of the curtain sheet 23, and thus, the curtain sheet 23 is inclined toward the lifting assembly 222 relative to the vertical direction. Further, the guide roller 24 on the curtain sheet 23 near the lifting assembly 222 can press and push the curtain sheet 23, so that the curtain sheet 23 is far away from the lifting assembly 222, and the correction of the pitch angle of the curtain sheet 23 can be realized.

The intersecting line between the curtain sheet 23 and the curling assembly 221 is a line along the length direction of the curling assembly 221 formed at the position where the curtain sheet 23 curled on the curling assembly 221 is immediately separated from the curling assembly 221, that is, a line along the length direction of the curling assembly 221 at the tangent position of the unfolded part of the curtain sheet 23 and the curling assembly 221.

It should be noted that the lifting assembly 222 includes a cross beam 2221 and a plurality of sets of brackets, each set of brackets includes a first support bar 2222 and a second support bar 2223, a first end of the first support bar 2222 is connected with the base 21, a second end of the first support bar 2222 is connected with a first end of the second support bar 2223, and a second end of the second support bar 2223 is connected with one side edge of the cross beam 2221 along the length direction. Meanwhile, another side edge of the cross beam 2221 along the length direction is fixedly connected with the second side edge of the curtain sheet 23, and the length of the cross beam 2221 is equal to the length of the second side edge of the curtain sheet 23, so that the cross beam 2221 comprehensively limits the curtain sheet 23 along the length direction, and the smoothness of the curtain sheet 23 is ensured. In this embodiment, the second end of the lifting assembly 222 is specifically a side edge of the cross beam 2221 fixedly connected to the curtain sheet 23.

It should be noted that, as shown in fig. 12, compared to fig. 5, an included angle between the cross beam 2221 and the horizontal plane changes due to a pulling force of the curtain sheet 23, that is, a relative position of two side edges of the cross beam 2221 along the length direction in the vertical direction changes due to the pulling force of the curtain sheet 23, so that a position relationship between an intersection line between the curtain sheet 23 and the curling assembly 221, and a position relationship between the first end and the second end of the lifting assembly 222 changes due to the change of the cross beam 2221, and the cross beam 2221 affects the arrangement of the guide roller 24 to a certain extent.

In other embodiments, as shown in fig. 13, when the intersection line between the curtain sheet 23 and the curling assembly 221 is located on the side close to the second end of the lifting assembly 222 in the horizontal direction, the guide roller 24 presses the curtain sheet 23 on the side of the curtain sheet 23 away from the lifting assembly 222. Thus, when the intersection line between the curtain sheet 23 and the curling assembly 221 is located on the side of the lifting assembly 222 close to the second end, because the first side of the curtain sheet 23 is fixedly connected with the curling assembly 221 and the second side of the curtain sheet 23 is fixedly connected with the second end of the lifting assembly 222, the intersection line between the curtain sheet 23 and the curling assembly 221 is close to the first side of the curtain sheet 23, and thus, the curtain sheet 23 is inclined toward the direction far away from the lifting assembly 222 relative to the vertical direction. Further, the guide roller 24 on the side of the curtain sheet 23 far from the lifting assembly 222 presses and pushes the curtain sheet 23, so that the curtain sheet 23 is close to the lifting assembly 222, and the correction of the pitch angle of the curtain sheet 23 can be realized.

It should be noted that, in the above two embodiments, the inclination of the lifting assembly 222 is the inclination of the second end of the lifting assembly 222 towards the curtain sheet 23. When the tilt of the lifting assembly 222 is the tilt of the second end of the lifting assembly 222 towards the direction away from the curtain sheet 23, the intersection line between the curtain sheet 23 and the curling assembly 221 is located at the side close to the first end of the lifting assembly 222, and at this time, the guide roller 24 presses the curtain sheet 23 at the side of the curtain sheet 23 away from the lifting assembly 222.

It should be noted that, in the above two embodiments, the guide rollers 24 correct the pitch angle of the curtain sheet 23 in the region between the guide rollers 24 and the second end of the lifting assembly 222, so that the guide rollers 24 are disposed close to the curling assembly 221 to ensure a large-area adjustment of the curtain sheet 23.

In some embodiments, the guide rollers 24 comprise two guide rollers with a gap design, and the curtain 23 passes through the gap between the two guide rollers. In this way, in the horizontal direction, no matter the intersection line between the curtain sheet 23 and the curling assembly 221 is located between the first end and the second end of the lifting assembly 222, or the intersection line between the curtain sheet 23 and the curling assembly 221 is located on the side close to the second end of the lifting assembly 222, any one of the two guide rollers can push and press the curtain sheet 23, so that the correction of the pitch angle of the curtain sheet 23 is realized.

It should be noted that, when the lifting assembly 222 is lifted to unfold the curtain sheet 23, the curling assembly 221 can rotate clockwise and can also rotate counterclockwise, and under the condition that the central axis position of the curling assembly 221 is fixed, the intersection line between the curling assembly 221 rotating clockwise and the curtain sheet 23 and the intersection line between the curling assembly 221 rotating counterclockwise and the curtain sheet 23 are different, so the relationship between the intersection line between the curtain sheet 23 and the curling assembly 221, the first end of the lifting assembly 222 and the second end of the lifting assembly 222 is different.

In some embodiments, the projection screen 2 further includes a rollable substrate, the curtain sheet 23 is adhered to the rollable substrate, and a plurality of reinforcing ribs are disposed on a side of the rollable substrate away from the curtain sheet 23, wherein a length direction of each reinforcing rib is not parallel to a longitudinal direction of the rollable substrate; the first side of the rollable substrate is fixedly connected to the rolling assembly 221, the second side of the rollable substrate opposite to the first side is fixedly connected to the lifting assembly 222, the rolling assembly 221 is capable of rolling the rollable substrate, the lifting assembly 222 is capable of unfolding the rollable substrate, and the support curtain 23 is in a flat state when the rollable substrate is unfolded.

Thus, the plurality of reinforcing ribs can enhance the strength of the rollable substrate, facilitate the rolling of the rollable substrate, and enable the rollable substrate to be uniformly stressed in the transverse direction when the rollable substrate is in a flat state, and be not easy to have ripples and wrinkles. Since the curtain sheet 23 is adhered to the rollable substrate, the curtain sheet 23 is not easily wrinkled or deformed, thereby improving the display effect of the curtain sheet 23.

In some embodiments, projection screen 2 further comprises a flexible carrier; the curtain piece 23 bonds on the flexible carrier, and the first side and the crimping subassembly 221 fixed connection of flexible carrier, the second side and the lift subassembly 222 fixed connection relative with first side on the flexible carrier, the flexible carrier can be curled to crimping subassembly 221, and the flexible carrier can be expanded to lift subassembly 222, supports the curtain piece 23 and is in the leveling condition when the flexible carrier expandes.

Thus, when the control mechanism 22 indirectly tensions the curtain sheet 23 through the flexible carrier, the flexible carrier bears a part of the tension force of the control mechanism 22, so that the curtain sheet 23 is not easy to damage, and the smoothness of the curtain sheet 23 is ensured.

Wherein, the flexible carrier is a carrier which is convenient to curl and has bearing strength, such as synthetic cloth, a film and the like. When the flexible carrier is a synthetic cloth, the material of the flexible carrier is a synthetic material containing nylon. Because the nylon material's mechanical strength is high, and toughness is good, has higher tensile, compressive strength, therefore flexible carrier is difficult to deform when being taut by control mechanism 22, and the surfacing, and then can improve the planarization of curtain piece 23.

The curtain sheet 23 and the flexible carrier are adhered by a double-sided adhesive tape or an adhesive film, or may be adhered by other methods, which is not limited in the embodiments of the present application.

In some embodiments, the projection screen 2 includes a curtain sheet 23, a rollable substrate, and a flexible carrier, wherein the curtain sheet 23 is adhered to the rollable substrate, a side of the rollable substrate away from the curtain sheet 23 is adhered to the flexible carrier, a first side of the flexible carrier is fixedly connected to the rolling assembly 221, and a second side of the flexible carrier opposite to the first side is fixedly connected to the lifting assembly 222.

In some embodiments, when the control mechanism 22 includes the winding assembly 221, the winding assembly 221 includes a winding controller electrically connected to the winding motor, a winding motor fixed to the base 21, an output shaft of the winding motor fixedly connected to an end of the winding drum, and a first side of the curtain sheet 23 fixedly connected to the winding drum. Wherein, the start-stop of curling motor can be controlled to the controller that curls, can drive the reel rotation after the curling motor starts. Thus, when the winding controller controls the winding drum to rotate, the curtain sheet 23 can be controlled to be wound on the winding drum.

In some embodiments, as shown in fig. 14, the projection apparatus further includes a housing portion 3, the housing portion 3 being configured to house the optical engine 1 and the projection screen 2; the housing 3 has a light-transmitting area 31 and an opening 32, the light beam emitted from the optical engine 1 can pass through the light-transmitting area 31, and the control mechanism 22 can control the curtain sheet 23 to pass through the opening 32 to be unfolded. Thus, when the projection apparatus is not used, the optical engine 1 and the projection screen 2 are accommodated in the accommodating portion 3, which facilitates space saving. When the projection apparatus is in use, the control mechanism 22 controls the curtain 23 to be unfolded, and the optical engine 1 projects a light beam onto the curtain 23, so that the curtain 23 displays an image.

The vertical distance from the center point of the light-transmitting region 31 to the plane of the developed screen 23 is equal to the product of the projection ratio of the optical engine 1 and the width of the display area on the screen 23, where the width of the display area is the size of the display area along the horizontal direction. Thus, the light beam emitted by the optical engine 1 can be accurately projected to the display area of the screen 23, so as to ensure the clarity of the display picture on the screen 23.

Since the throw ratio is a performance parameter of the optical engine 1, the throw ratio of the optical engine 1 is related to the selected optical engine 1, that is, the throw ratio is different when different optical engines 1 are selected, and the vertical distance from the center point of the light-transmitting region 31 to the plane where the developed screen 23 is located is different. In this way, in the actual installation process, the vertical distance from the central point of the light-transmitting region 31 to the plane where the developed curtain sheet 23 is located is calculated according to the projection ratio of the optical engine 1 and the width of the display region, so that the light beam emitted by the optical engine 1 can be completely projected on the display region of the curtain sheet 23.

Alternatively, the guide roller 24 is located in the storage part 3, so that the guide roller 24 can be hidden in the storage part 3, thereby enhancing the aesthetic appearance of the projection screen 2, and the curtain sheet 23 can be pressed before the curtain sheet 23 protrudes out of the storage part 3. In other embodiments, the guide roller 24 is located above the storage portion 3, the guide roller 24 is disposed at a position that does not interfere with the screen 23 for displaying the projection screen, and the guide roller 24 is typically disposed at a position that is close to the storage portion 3 and below the lower edge of the projection screen.

It should be noted that, when the projection screen 2 includes the curtain sheet 23 and the flexible carrier, the size of the curtain sheet 23 is smaller than that of the flexible carrier, and a certain distance is left between the edge of the curtain sheet 23 close to the receiving portion 3 and the receiving portion 3, so that the guide roller 24 is located below the curtain sheet 23 and is pressed against the flexible carrier, and the projection screen can be prevented from being blocked.

Next, the structure of the projection screen including the tension mechanism will be explained in detail.

In some embodiments, the projection screen further comprises a tensioning mechanism; the tensioning mechanism is fixedly connected with the curling assembly, and the curling assembly can control the tensioning mechanism to curl on the curling assembly; the second end of the lifting assembly is fixedly connected with the tensioning mechanism, the lifting assembly can control the curtain sheet and the tensioning mechanism to be synchronously unfolded, and the pitching angle of the curtain sheet can be limited when the tensioning mechanism is unfolded; wherein the lifting assembly is positioned between the curtain and the tensioning mechanism.

Thus, when the curtain sheet and the tensioning mechanism are in the unfolding state, because the lifting assembly is positioned between the curtain sheet and the tensioning mechanism, the tension of the lifting assembly by the tensioning mechanism is balanced with the tension of the lifting assembly by the curtain sheet, and thus, the tensioning mechanism can limit the pitching angle of the curtain sheet and correct the pitching angle of the curtain sheet.

In some embodiments, when the lift assembly includes a cross beam, the cross beam is a thin plate-like cross beam. The curtain sheet is fixedly connected with a first side edge along the length direction on the cross beam, the tensioning mechanism is connected with a second side edge along the length direction on the cross beam, and the curtain sheet and the tensioning mechanism are respectively positioned at two sides of the second supporting rod. In this way, the tensioning mechanism balances the tension of the curtain sheet on the cross beam by tensioning the cross beam, thereby defining the pitch angle of the curtain sheet.

In some embodiments, the crimping assembly comprises a first sub-crimping assembly and a second sub-crimping assembly; the first sub-curling assembly and the second sub-curling assembly are both connected with the base, the first sub-curling assembly and the curtain sheet are positioned on the same side of the lifting assembly, and the second sub-curling assembly and the tensioning mechanism are positioned on the same side of the lifting assembly; the screen sheet is fixedly connected to the first sub-curling assembly, and the first sub-curling assembly can control the screen sheet to curl on the first sub-curling assembly; the tensioning mechanism is fixedly attached to the second sub-crimping assembly, and the second sub-crimping assembly is capable of controlling the tensioning mechanism to crimp on the second sub-crimping assembly.

Thus, since the embodiments described above illustrate the lift assembly located between the curtain and the tensioning mechanism, the first sub-rollup assembly and the curtain are located on one side of the lift assembly and the second sub-rollup assembly and the tensioning mechanism are located on the other side of the lift assembly. Further, since the second sub-curling assembly can control the tensioning mechanism to curl on the second sub-curling assembly, after the curtain sheet is tilted forwards, the second sub-curling assembly is adjusted forwards by a small amplitude to realize further curling of the tensioning mechanism, so that the tensioning force of the tensioning mechanism on the second end of the lifting assembly can be increased to adjust the pitch angle of the curtain sheet. After the curtain sheet is tilted backwards, the second sub-curling component is reversely adjusted by a small amplitude to realize slight unfolding of the tensioning mechanism, so that the tensioning force of the tensioning mechanism to the second end of the lifting component can be reduced, and the pitching angle of the curtain sheet can be adjusted. Similarly, after the curtain sheet tilts forward or tilts backward, the pitching angle of the curtain sheet is adjusted by adjusting the first sub-curling assembly in a small amplitude, or the pitching angle of the curtain sheet is adjusted by adjusting the first sub-curling assembly and the second sub-curling assembly in a small amplitude.

It should be noted that the first sub-curling component independently controls the curtain sheet, and the second sub-curling component independently controls the tensioning mechanism, so that the tensioning force of the curtain sheet to the second end of the lifting component can be independently adjusted, and the tensioning force of the tensioning mechanism to the second end of the lifting component can be independently adjusted.

In some embodiments, the take-up mechanism includes an auxiliary roller and a take-up assembly; the first end of tensioning assembly and lifting unit's second end fixed connection, tensioning assembly's second end and curling subassembly fixed connection, the both ends of auxiliary roller are spacing on the base, and compress tightly on tensioning assembly.

Thus, since the first end of the tensioning assembly is fixedly connected with the second end of the lifting assembly and the second end of the tensioning assembly is fixedly connected with the curling assembly, the curling assembly can curl to retract the tensioning assembly; the lifting assembly is capable of being lifted to deploy the tensioning assembly. The curling assembly can control the curtain and the tensioning assembly to curl on the curling assembly at the same time, and then the synchronous curling and the unfolding of the curtain and the tensioning assembly are convenient. In addition, because the auxiliary roller is pressed against the tensioning assembly, the tensioning force of the tensioning assembly on the second end of the lifting assembly can be controlled.

In some embodiments, the tensioning assembly is a first auxiliary cloth or a plurality of first tensioning cords. In the case where the lifting assembly includes a thin plate-shaped cross member, when the tightening assembly is a first auxiliary cloth, one side edge of the first auxiliary cloth is fixedly connected to a second side edge of the cross member in the length direction, and the other side edge of the first auxiliary cloth opposite to the one side edge is fixedly connected to the curling assembly, so that the first auxiliary cloth can tighten the lifting assembly based on the cross member. When the tensioning assembly is the first tensioning ropes, every two first tensioning ropes are parallel, one end of each first tensioning rope can be fixedly connected with the second side edge of the beam along the length direction, the other end of each first tensioning rope is fixedly connected with the curling assembly, and therefore the first tensioning ropes can tension the lifting assembly based on the beam.

The first auxiliary cloth is fixedly connected with the cross beam through screws or fixedly connected with the cross beam through other modes. In addition, the length of the side fixedly connected with the cross beam on the first auxiliary cloth and the length of the side fixedly connected with the cross beam on the curtain sheet are smaller than or equal to the length of the cross beam, so that the cross beam can limit the first auxiliary cloth and the curtain sheet more comprehensively under the condition that the stress on the two sides of the lifting assembly is more balanced.

When the tensioning assembly is the first tensioning ropes, the beam can be provided with a plurality of fixing holes in one-to-one correspondence with the first tensioning ropes, and each tensioning rope can be bound and connected with the beam based on one corresponding fixing hole. The distance between every two first tensioning ropes is equal, so that the tensioning force of each first tensioning rope to the cross beam is equal, the stability of the cross beam can be further guaranteed, and deflection and the like cannot occur.

It should be noted that in the case where the lifting assembly includes a cross member, when the crimping assembly includes a first sub-crimping assembly and a second sub-crimping assembly, the tensioning mechanism is a second auxiliary cloth or a plurality of second tensioning ropes. In the case where the lifting assembly includes a thin plate-shaped cross member, when the tensioning mechanism is the second auxiliary cloth, the connection manner and connection position of the second auxiliary cloth to the cross member are the same as or similar to those of the first auxiliary cloth to the cross member, except that the second auxiliary cloth is fixedly connected to the second sub-crimping assembly. When straining the mechanism and be many second taut ropes, the connected mode, the connected position of many second taut ropes and crossbeam are the same or similar with the connected mode, the connected position of many first taut ropes and crossbeam, and the difference lies in, many second taut ropes and the subassembly fixed connection of curling of second son, and this application embodiment is no longer repeated to this.

In some embodiments, the auxiliary roller is in a strip structure, and the length direction of the auxiliary roller is parallel to the axial direction of the curling assembly. Like this, the auxiliary roller of strip structure is convenient for compress tightly on tensioning assembly along length direction to carry out spacing on a large scale to tensioning assembly. Further, because the length direction of the auxiliary roller is parallel to the axial direction of the curling assembly, the auxiliary roller can ensure the smoothness of the tensioning assembly, the phenomenon that the tensioning assembly is distorted due to the existence of the auxiliary roller is avoided, and further the distortion of the lifting assembly is avoided.

Wherein the cross section of the auxiliary roller is circular or polygonal. The auxiliary roller with the round cross section is convenient to process, the surface of the auxiliary roller is smooth, and the curtain sheet is not easily damaged.

It should be noted that the auxiliary roller is fixed or can rotate around its own longitudinal axis when pressed against the tightening unit. In the case that the auxiliary roller can rotate, when the curling assembly curls to retract the tensioning assembly or the lifting assembly controls the tensioning assembly to be unfolded, the auxiliary roller rotates, so that the friction force between the auxiliary roller and the tensioning assembly can be reduced, and the damage to the tensioning assembly caused by the friction between the auxiliary roller and the tensioning assembly can be prevented. Of course, when the crimping assembly is crimped to take up the tensioning assembly, or tensioned to deploy the tensioning assembly, to prevent friction, the auxiliary roller is moved away from the tensioning assembly to avoid direct contact of the auxiliary roller with the tensioning assembly, and is pressed against the tensioning assembly by the auxiliary roller after deployment of the tensioning assembly to define the pitch angle of the curtain.

In some embodiments, the auxiliary roller includes a central shaft having both ends connected to the base and a drum rotatably fitted over the central shaft. In this way, the auxiliary roller is pressed against the side of the tensioning assembly adjacent to the curtain sheet. Wherein, because the cylinder can rotate around the center pin, when the tensioning assembly is packed up or is expanded to the subassembly that curls, can produce relative motion between tensioning assembly and the cylinder, and then can show the friction that reduces between cylinder and the tensioning assembly to avoid the wearing and tearing to tensioning assembly, improve the flexibility that the tensioning assembly was packed up and was expanded to the subassembly that curls simultaneously.

In some embodiments, the auxiliary roller is provided with a lubricating coating, so that the lubricating coating can avoid the direct contact between the auxiliary roller and the tensioning assembly and can play a role in lubricating between the auxiliary roller and the tensioning assembly. Thereby relative motion between auxiliary roller and the taut subassembly can be more smooth and easy, can avoid the surface of auxiliary roller because of reasons such as unsmooth fish tail taut subassembly simultaneously to prolong taut subassembly's life. Wherein, the lubricating coating is a coating or a colloidal coating consisting of flexible particles.

In some embodiments, two second guide grooves are arranged on the base in opposite positions, and two ends of the auxiliary roller are respectively located in the two second guide grooves and can move in the second guide grooves under the action of an external force, so that the pressing force on the tensioning assembly is adjusted. Thus, after the auxiliary roller is in contact with the tension assembly and continues to move along the length direction of the second guide groove, the tension assembly can be pushed. Because the first end of take-up unit and lifting unit's second end fixed connection, the second end of take-up unit and curling subassembly fixed connection, and lifting unit and curling subassembly are quiescent condition, therefore when the auxiliary roll promoted take-up unit, can increase the dynamics of compressing tightly to take-up unit tightens, like this, take-up unit has certain rising to the straining force of lifting unit's second end. Similarly, when the auxiliary roller is far away from the tensioning assembly along the length direction of the second guide groove, the pressing force of the auxiliary roller on the tensioning assembly is reduced, and the tensioning force of the tensioning assembly on the second end of the lifting assembly is reduced to some extent.

It should be noted that the projection screen further includes an auxiliary driving motor and an auxiliary transmission mechanism for controlling the auxiliary roller to move along the length direction of the second guide groove, where the auxiliary transmission mechanism has the same or similar structure as the transmission mechanism in the embodiment of the present application, and the embodiment of the present application is not described herein again.

Further, the auxiliary roller can change the pitch angle of the curtain sheet based on the adjustment of the pressing force of the tensioning assembly, and when the pitch angle of the curtain sheet is changed to the target pitch angle, the auxiliary roller is controlled to stop moving and is fixed, so that the pitch angle of the curtain sheet is limited.

Wherein, because the quantity of second guide way is two, correspondingly, the base includes two backup pads, and two second guide ways set up respectively in two backup pads, like this, can be convenient for two second guide ways are passed respectively at the both ends of auxiliary roll.

The shape of the second guide groove is a long strip shape, an oval shape, or other shapes, as long as the auxiliary roller can move in the second guide groove and is fixed on the second guide groove, which is not limited in the embodiment of the present application. The width of the second guide groove is slightly larger than the diameter or side length of the cross section of the auxiliary roller. Thus, the auxiliary roller can be more flexibly moved in the length direction of the second guide groove.

In some embodiments, the length direction of the second guide groove is a horizontal direction or a direction forming an acute angle with the horizontal direction. Illustratively, when the auxiliary roller moves in the second guide groove, the auxiliary roller can have a movement component in the horizontal direction, so that the relative position relationship of the contact position of the tensioning component and the auxiliary roller, the first end of the tensioning component and the second end of the tensioning component along the horizontal direction can be adjusted, and the adjustment of the pressing force of the auxiliary roller on the tensioning component can be realized.

In some embodiments, a lubricating member closely attached to the inner wall of each second guide groove is provided on the inner wall of each second guide groove, so that friction between the auxiliary roller and the second guide groove can be reduced, the smoothness of movement of the auxiliary roller in the second guide groove can be enhanced, and the movement accuracy of the auxiliary roller can be improved.

Next, a structure of the projection screen including the adjustment screw will be explained in detail.

In some embodiments, when the lifting assembly comprises a plurality of sets of supports, each set of supports comprises a first support rod and a second support rod, the first end of the first support rod is rotatably connected with the base, the second end of the first support rod is rotatably connected with the first end of the second support rod, and the second end of the second support rod is rotatably connected with the curtain, the plurality of sets of supports can control the curtain to be unfolded; one of the first support rod and the second support rod is provided with an adjusting screw, one end of the adjusting screw abuts against the side wall of the other support rod, and the adjusting screw is used for adjusting the relative position of the second end of the first support rod and the first end of the second support rod so as to adjust the pitching angle of the curtain sheet.

Thus, when the curtain sheet is in an unfolding state, one end of the adjusting screw arranged on one of the first supporting rod and the second supporting rod is abutted against the side wall of the other one of the first supporting rod and the second supporting rod, so that the relative position of the second end of the first supporting rod and the first end of the second supporting rod is adjusted by rotating the adjusting screw, and the inclination angle of the second supporting rod can be further adjusted.

In some embodiments, the number of sets of supports is provided in two sets, such that one set of supports is provided at a position near both ends of the curling assembly, respectively, so that the two sets of supports can unfold the curtain sheet based on both ends near one side of the curtain sheet. Of course, the number of sets of stents can be provided in three sets, such that one set of stents is provided near each end of the crimping assembly and one set of stents is provided near the middle of the crimping assembly. Thus, the three sets of supports are based on the two ends of one side edge of the curtain being adjacent and the curtain being deployed at a central location of that side edge of the curtain.

It should be noted that each set of the support includes a mounting gap at a rotatable connection between the first end of the first support rod and the base, between the second end of the first support rod and the first end of the second support rod, and between the second end of the second support rod and the curtain sheet, so as to facilitate flexible extension and folding of the support.

In some embodiments, each set of brackets includes a first connecting shaft, the second end of the first support rod is provided with a first connecting groove, the first end of the second support rod extends into the first connecting groove, and the second end of the first support rod and the first end of the second support rod are rotatably connected through the first connecting shaft. One end of the adjusting screw is screwed into the first connecting groove based on the outer wall of the first supporting rod and is abutted against the outer wall of the second supporting rod. In this way, the first connecting groove is matched with the first end of the second supporting rod, so that the adjusting screw arranged on the first supporting rod can be abutted against the side wall of the second supporting rod.

Wherein, the shape of the tank bottom surface of the first connecting tank is set according to the shape of the first supporting rod. Illustratively, when the cross-sectional shape of the first support bar is square, the groove bottom surface of the first connection groove is also square, and when the cross-sectional shape of the first support bar is circular, the groove bottom surface of the first connection groove is also circular.

The two ends of the first connecting shaft are respectively provided with a fixing nut, and each fixing nut is tightly pressed on the side wall of the first supporting rod after being screwed. Like this, first connecting axle and first bracing piece fixed connection, and then when the second bracing piece was rotatory round first connecting axle, can realize the angle change between second bracing piece and the first bracing piece to can realize the extension and the folding of support.

In some embodiments, the first support bar comprises a bar body and two first connecting plates; the first end of the rod body is rotatably connected with the base, the two first connecting plates are oppositely arranged at the end part of the second end of the rod body to form a first connecting groove, and at least one adjusting screw is arranged on at least one first connecting plate. Like this, because the first end of second bracing piece stretches into the first connecting groove that two first connecting plates formed, and be provided with at least one adjusting screw on at least one first connecting plate, therefore through the adjusting screw who sets up on the rotatory first connecting plate, make adjusting screw promote the second bracing piece to the realization is to the regulation of second bracing piece and first bracing piece relative position.

Wherein, two first connecting plates set up relatively, and all with the lateral wall fixed connection of the body of rod to form the great first connecting groove in space. Two first connecting plates respectively with the body of rod welding, perhaps respectively with body of rod integrated into one piece, this application embodiment contrast does not limit.

Wherein, be provided with an adjusting screw on two arbitrary first connecting plate in first connecting plate, and adjusting screw and first connecting axle are not located same height. Like this, when rotatory adjusting screw, use first connecting axle as the fulcrum, with rotatory screw butt on the second bracing piece and promote the second bracing piece to the inclination of adjustment second bracing piece, with the regulation of the relative position of the first end of realization second bracing piece and the second end of first bracing piece.

Of course, in some embodiments, two adjusting screws are disposed on any one of the first connecting plates, and the line connecting the two adjusting screws is along the vertical direction or forms an acute angle with the vertical direction. In actual use, two adjusting screws are usually used in combination. Specifically, one of the adjusting screws relatively located above is fixed, the adjusting screw is kept in a state of abutting against the side wall of the second supporting rod, and the other adjusting screw is rotated to enable the adjusting screw to push the second supporting rod, so that the second supporting rod is controlled to swing towards a direction perpendicular to a connecting line of the two adjusting screws, and the inclination angle of the second supporting rod can be adjusted, and the relative position of the first end of the second supporting rod and the second end of the first supporting rod can be adjusted.

Of course, in some embodiments, three adjusting screws are arranged on any one first connecting plate, and the three adjusting screws are connected into a regular triangle. Like this, three adjusting screw can carry out three places constraint to the second bracing piece, and three adjusting screw's tip can form a plane, therefore can prevent effectively that the second bracing piece from rocking at will towards the planar of tip place of three adjusting screw to make the motion state of second bracing piece more stable.

It should be noted that, can all set up one, two or three adjusting screw on every first connecting plate, because the first end of second bracing piece stretches into the first connecting groove that two first connecting plates formed, therefore adjusting screw on two first connecting plates is opposite to the promotion direction of second bracing piece to can realize the reciprocal adjustment to second bracing piece inclination, and then realize the regulation to the relative position of the first end of second bracing piece and the second end of first bracing piece.

In some embodiments, an adjusting screw is disposed on one of the first support bar and the base, and one end of the adjusting screw abuts against a sidewall of the other one, and the adjusting screw is used for adjusting a relative position of the first end of the first support bar and the base. Thus, the relative position of the first support rod and the base can be adjusted by rotating the adjusting screw.

In some embodiments, each set of brackets further comprises a second connecting shaft; the base is provided with a second connecting groove, the first end of the first supporting rod extends into the second connecting groove, and the first end of the first supporting rod is rotatably connected with the base through a second connecting shaft; one end of the adjusting screw can be screwed into the second connecting groove based on the outer wall of the base and abuts against the outer wall of the first supporting rod. In this way, the cooperation of the second connecting groove and the first end of the first supporting rod facilitates that the adjusting screw arranged at the second connecting groove of the base can abut on the side wall of the first supporting rod.

It should be noted that, the structure of the second connection groove is the same as or similar to that of the first connection groove, and the arrangement manner of the adjustment screw on the second connection groove may be the same as or similar to that of the adjustment screw on the first connection groove, which is not described in detail herein in this embodiment of the application.

In some embodiments, when the lift assembly comprises a cross beam; one of the second supporting rod and the cross beam is provided with an adjusting screw, one end of the adjusting screw abuts against the side wall of the other one of the second supporting rod and the cross beam, and the adjusting screw is used for adjusting the relative position of the second end of the second supporting rod and the cross beam. Thus, the relative position of the second supporting rod and the cross beam can be adjusted by rotating the adjusting screw.

In some embodiments, each set of brackets further comprises a third connecting shaft; the cross beam is provided with a third connecting groove, the second end of the second supporting rod extends into the third connecting groove, and the second end of the second supporting rod is rotatably connected with the cross beam through a third connecting shaft; one end of the adjusting screw is screwed into the third connecting groove based on the outer wall of the cross beam and abuts against the outer wall of the second supporting rod. In this way, the cooperation of the third connecting groove and the second end of the second supporting rod facilitates the adjusting screw arranged at the third connecting groove of the cross beam to be capable of abutting against the side wall of the second supporting rod.

It should be noted that, the structure of the third connecting groove is the same as or similar to that of the first connecting groove, and the setting manner of the adjusting screw on the third connecting groove may be the same as or similar to that of the adjusting screw on the first connecting groove, which is not described in detail herein in this embodiment of the application.

In some embodiments, the projection screen further comprises a spacer; the adjusting shim is positioned in the first connecting groove and is sleeved on the first connecting shaft in a sliding manner, and the adjusting shim is clamped between one end of the adjusting screw and the side wall of the second supporting rod. Therefore, the adjusting screw is directly abutted against the adjusting gasket, so that the adjusting gasket can disperse the thrust applied by the end part of the adjusting screw, the stress of the second supporting rod can be more uniform, and the phenomena of stress concentration and non-uniform stress caused by the direct contact of the adjusting screw and the side wall of the second supporting rod are avoided.

The adjusting shim is in a round sheet structure, or in a square, triangular or other shape structure. When the first support rod includes the first connection plate, the shape of the adjustment washer may be similar to that of the first connection plate in order to allow the adjustment screw provided at any position of the first connection plate to abut against the adjustment washer.

The thickness of the adjusting shim is far smaller than the gap width between the second end of the first supporting rod and the first end of the second supporting rod along the length direction of the first connecting shaft, so that the adjusting screw can freely adjust the position relation between the first supporting rod and the second supporting rod. Illustratively, the shim has a thickness that is one-sixth of the width of the gap.

In some embodiments, each set of brackets includes a second connecting shaft, and when the base is provided with a second connecting groove, an adjusting gasket is arranged in the second connecting groove and slidably sleeved on the second connecting shaft, and the adjusting gasket is clamped between one end of an adjusting screw screwed into the second connecting groove and the side wall of the first supporting rod. In addition, the function and shape of the adjusting shim are the same as or similar to those of the adjusting shim in the above embodiments, and are not described again in this embodiment.

In some embodiments, each set of brackets comprises a third connecting shaft; when the beam is provided with the third connecting groove, an adjusting gasket is also arranged in the third connecting groove, the adjusting gasket is sleeved on the third connecting shaft in a sliding manner, and the adjusting gasket is clamped between one end of an adjusting screw screwed into the third connecting groove and the side wall of the second supporting rod. Similarly, the function and shape of the adjusting shim are the same as or similar to those of the adjusting shim in the above embodiments, and are not described in detail in this application.

In this application embodiment, when control mechanism supported the curtain piece, driving motor can drive the automatic control of drive mechanism operation in order to realize drive mechanism, and then the drive mechanism of being convenient for drives the guide roll and removes. Because the guide roller can move in the first guide groove, after the guide roller is contacted with the curtain sheet and continuously moves in the first guide groove, the curtain sheet can be pushed and pressed on the curtain sheet so as to limit the pitching angle of the curtain sheet. Therefore, the position of the screen can be corrected through the guide roller, and the problems of distortion, fuzzy distortion and the like of the picture displayed on the screen can be avoided, so that the display effect of the projection screen is improved. When the projection equipment is used, the lifting assembly expands the curtain sheet on the curling assembly so that the curtain can receive the light beams emitted by the optical engine; the curling assembly can control the curtain sheet to curl on the curling assembly when the projection device is not used, thereby reducing the occupied space of the projection screen.

The above description is only illustrative of the embodiments of the present application and is not intended to limit the embodiments of the present application, and any modification, equivalent replacement, or improvement made within the spirit and principle of the embodiments of the present application should be included in the scope of the embodiments of the present application.

Claims

1. A projection device, characterized in that the projection device comprises:

an optical engine to emit a light beam;

2. The projection device of claim 1, wherein the transmission mechanism includes a worm and a worm gear;

3. The projection apparatus of claim 2, wherein an axial direction of the output shaft of the driving motor is collinear with a length direction of the worm, and the output shaft of the driving motor is fixedly connected to an end of the worm.

4. The projection device of claim 2, wherein the transmission mechanism further comprises a first gear and a second gear, the first gear is fixedly connected to the output shaft of the driving motor along the axial direction, the second gear is fixedly connected to one end of the worm along the axial direction, and the first gear is meshed with the second gear.

5. The projection apparatus of claim 4, wherein an axial direction of an output shaft of the driving motor is parallel to a length direction of the worm shaft, and the first gear and the second gear are both cylindrical gears.

6. The projection apparatus of claim 4, wherein an axial direction of an output shaft of the driving motor is perpendicular to a length direction of the worm shaft, and the first gear and the second gear are both bevel gears.

7. The projection device of claim 1, wherein the transmission mechanism includes a lead screw;

8. The projection apparatus according to claim 2 or 7, wherein the transmission mechanism further comprises a third gear and a rack, the third gear is axially limited at the second end of the guide roller, the rack is fixed on the base, and the length direction of the rack is parallel to the length direction of the first guide groove and is meshed with the third gear.

9. The projection device of claim 1, wherein a length direction of the first guide groove is a horizontal direction.

10. The projection device of claim 1, wherein the control mechanism includes a curl assembly and a lift assembly;