WO2022258064A1

WO2022258064A1 - Projection apparatus

Info

Publication number: WO2022258064A1
Application number: PCT/CN2022/098266
Authority: WO
Inventors: 陈友才; 杨长明
Original assignee: 青岛海信激光显示股份有限公司
Priority date: 2021-06-11
Filing date: 2022-06-10
Publication date: 2022-12-15

Abstract

Some embodiments of the present disclosure provide a projection apparatus. The projection apparatus comprises an optical engine and a projection screen. The optical engine is configured to emit a light beam to the projection screen and the projection screen is configured to display a projection picture. The projection screen comprises a base, a lifting mechanism, a screen, a rolling mechanism and a control mechanism. The lifting mechanism is connected to the base; a first side edge of the screen is connected to the lifting mechanism; the rolling mechanism is connected to a second side edge of the screen; and the control mechanism is connected to the base and the rolling mechanism, and the control mechanism is configured to control movement of the rolling mechanism, and drive the rolling mechanism to roll up the second side edge so as to adjust a pitch angle of the screen.

Description

projection device

This application claims the priority of the Chinese patent application with application number 202121316465.X filed on June 11, 2021; the priority of the Chinese patent application with application number 202121565316.7 filed on July 09, 2021; Priority to Chinese Patent Application No. 202111136349.4 filed on September 27, 2021; Priority to Chinese Patent Application No. 202122354211.3 filed on September 27, 2021, the entire contents of which are hereby incorporated by reference In this application.

technical field

The present disclosure relates to the technical field of projection display, and in particular, to a projection device.

Background technique

With the continuous development of science and technology, projection devices are increasingly used in people's work and life. Currently, a projection device mainly includes an optical engine and a projection screen. The light outlet of the optical engine faces the projection screen to emit the light beam to the projection screen, and the projection screen is configured to reflect the light beam to realize the display of the picture.

Contents of the invention

Some embodiments of the present disclosure provide a projection device, and the projection device includes an optical engine and a projection screen. The optical engine is configured to emit light beams to the projection screen, and the projection screen is configured to display projection images. The projection screen includes a base, a lifting mechanism, a curtain, a curling mechanism and a control mechanism. The lifting mechanism is connected with the base. The first side of the screen is connected with the lifting mechanism. The curling mechanism is connected to the second side of the screen. The control mechanism is arranged on the base and connected to the curling mechanism, and the control mechanism is configured to: control the movement of the curling mechanism, and drive the curling mechanism to roll up the second side, to adjust the pitch angle of the curtain.

Description of drawings

FIG. 1 is a side view of a projection device according to some embodiments;

Fig. 2 is a partial perspective view of the projection device shown in Fig. 1;

Fig. 3 is a structural diagram of a projection device according to some embodiments;

Fig. 4 is a structural diagram of an optical engine according to some embodiments;

Fig. 5 is a structural diagram of another projection screen according to some embodiments;

Figure 6 is a partial enlarged view of circle B in Figure 5;

Figure 7 is a partial enlarged view of circle C in Figure 5;

Fig. 8 is a structural diagram of another projection screen according to some embodiments;

Fig. 9 is a structural diagram of another projection screen according to some embodiments;

Fig. 10 is a structural diagram of another projection device according to some embodiments;

Fig. 11 is a partial perspective view of another projection device according to some embodiments;

Fig. 12 is a partial perspective view of another projection device according to some embodiments;

Fig. 13 is an exploded view of the projection device in Fig. 12;

Figure 14 is a structural diagram of a control mechanism according to some embodiments;

Fig. 15 is a structural diagram of a projection screen in a retracted state according to some embodiments;

Fig. 16 is a structural diagram of a projection screen in an unfolded state according to some embodiments;

Fig. 17 is a structural diagram of a connection structure of a rotatable connection according to some embodiments;

Fig. 18 is a force analysis diagram of a connection structure of a rotatable connection according to some embodiments;

Fig. 19 is a structural diagram of another connection structure of a rotatable connection according to some embodiments;

Fig. 20 is a force analysis diagram of another connection structure of a rotatable connection according to some embodiments;

Fig. 21 is a structural diagram of another connection structure of a rotatable connection according to some embodiments;

Fig. 22 is a structural diagram of another projection screen in an unfolded state according to some embodiments;

Fig. 23 is a structural diagram of another projection screen in a retracted state according to some embodiments;

Fig. 24 is a partial enlarged view of circle A in Fig. 23;

Fig. 25 is a structural diagram of a second lead screw according to some embodiments;

Figure 26 is a block diagram of a conveyor belt assembly according to some embodiments;

Fig. 27 is a partial structural diagram of a curtain according to some embodiments;

Fig. 28 is a partial enlarged view at circle D in Fig. 27;

Figure 29 is a partial structural view of another screen according to some embodiments;

Fig. 30 is a structural diagram of yet another projection screen according to some embodiments;

Figure 31 is a partial enlarged view of circle E in Figure 30;

Figure 32 is a partial enlarged view at the circle F in Figure 30;

Fig. 33 is a partial enlarged view at circle G in Fig. 30;

Fig. 34 is a partially enlarged view of circle H in Fig. 30 .

Detailed ways

The technical solutions in some embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present disclosure, not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments provided in the present disclosure belong to the protection scope of the present disclosure.

The use of "suitable for" or "configured to" herein means open and inclusive language that does not exclude devices that are suitable for or configured to perform additional tasks or steps.

Additionally, the use of "based on" is meant to be open and inclusive, as a process, step, calculation, or other action that is "based on" one or more stated conditions or values may in practice be based on additional conditions or beyond stated values.

As used herein, "about", "approximately" or "approximately" includes the stated value as well as the average within the acceptable deviation range of the specified value, wherein the acceptable deviation range is as determined by one of ordinary skill in the art. Determined taking into account the measurement in question and the errors associated with the measurement of a particular quantity (ie, limitations of the measurement system).

As used herein, "parallel", "perpendicular", and "equal" include the stated situation and the situation similar to the stated situation, the range of the similar situation is within the acceptable deviation range, wherein the The acceptable deviation ranges are as determined by one of ordinary skill in the art taking into account the measurement in question and errors associated with measurement of the particular quantity (ie, limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; Deviation within 5°. "Equal" includes absolute equality and approximate equality, where the difference between the two that may be equal is less than or equal to 5% of either within acceptable tolerances for approximate equality, for example.

FIG. 1 is a side view of a projection device according to some embodiments, FIG. 2 is a partial perspective view of the projection device shown in FIG. 1 , and FIG. 3 is a structural diagram of a projection device according to some embodiments. As shown in FIGS. 1 to 3 , the projection device 1000 includes an optical engine 100 , a projection screen 200 and a storage portion 300 .

The optical engine 100 may be an ultra-short-focus optical engine, and the ultra-short-focus optical engine may be a digital light processing (Digital Light Processing, DLP) optical engine. In this way, the vertical distance between the optical engine 100 and the plane where the projection screen 200 is located can be reduced to reduce the occupied space of the projection device.

Fig. 4 is a structural diagram of an optical engine according to some embodiments. As shown in FIG. 4 , the optical engine 100 includes a light source 11 , an optical-mechanical system 12 and a lens 13 . Both the light source 11 and the lens 13 are fixedly connected with the optomechanical system 12 . The light source 11 is configured to emit light beams to the optomechanical system 12 . The lens 13 may be an ultra-short focal projection lens.

The optomechanical system 12 includes a digital micromirror array (Digital Micromirror Device, DMD) chip and a driving circuit board electrically connected to the DMD chip, and the driving circuit board is configured to provide a driving signal to the DMD chip. Therefore, the DMD chip can modulate the light beam emitted by the light source 11 based on the driving signal, and emit the modulated light beam to the lens 13 , and then emit the light beam to the curtain 202 through the lens 13 to realize the display of the picture.

Fig. 5 is a structural diagram of another projection screen according to some embodiments, Fig. 6 is a partial enlarged view of circle B in Fig. 5 , and Fig. 7 is a partial enlarged view of circle C in Fig. 5 . Fig. 8 is a structural diagram of yet another projection screen according to some embodiments.

In some embodiments, as shown in FIGS. 5-8 , the curtain 202 includes an optical film 2021 . The optical film 2021 includes white plastic screen, gray plastic screen, rollable Fresnel optical screen or flexible black grid screen, etc.

Compared with the traditional curtain 202, the optical film 2021 has higher optical gain, and can restore the brightness and contrast of the light beam as much as possible.

Fig. 9 is a structural diagram of yet another projection screen according to some embodiments. In some embodiments, as shown in FIG. 9 , the curtain 202 further includes a flexible carrier 2022 . The surface (for example, the back surface) of the optical film 2021 opposite to the surface of the optical film for displaying pictures is fixed (eg, bonded) on the flexible carrier 2022 . The material of the flexible carrier 2022 is soft and has a large amount of stretched film, so as to ensure the curling of the curtain 202 and avoid the deformation of the flexible carrier 2022 under the action of external force. For example, flexible carrier 2022 is a synthetic cloth.

The storage part 300 is configured to store the optical engine 100 and the projection screen 200 . In this way, when the projection device 1000 is not in use, the optical engine 100 and the projection screen 200 are stored in the storage portion 300 , which is convenient for saving space. When the projection device 1000 is in use, the lifting mechanism 203 controls the curtain 202 to unfold, and the optical engine 100 projects light beams onto the curtain 202 to make the curtain 202 display a projected image.

As shown in FIG. 3 , the receiving portion 300 includes a light-transmitting area 301 and an opening 302 , the optical engine 100 is accommodated in the light-transmitting area 301 , and the light beam emitted by the optical engine 100 can pass through the light-transmitting area 301 . The projection screen 200 is accommodated in the opening 302 , and the lifting mechanism 203 can control the screen 202 to protrude from the opening 302 and unfold.

The vertical distance S from the center point of the light-transmitting area 301 to the plane where the screen 202 is unfolded is equal to the product of the projection ratio of the optical engine 100 and the width W of the display area on the screen 202, and the width W of the display area refers to the The horizontal dimension. In this way, it can be ensured that the light beam emitted by the optical engine 100 can be accurately projected onto the display area of the curtain 202 , so as to improve the definition of the projected picture on the curtain 202 .

The throw ratio is the performance parameter of the optical engine 100 itself, so the throw ratio of the optical engine 100 is related to the selected optical engine 100, that is, if different optical engines are selected, the throw ratio will be different, and then the central point of the light-transmitting area 301 will reach the position after unfolding. The vertical distances of the planes where the curtains 202 are located are also different. In this way, the vertical distance from the center point of the light-transmitting area 301 to the plane where the unfolded curtain 202 is located is calculated through the projection ratio of the optical engine 100 and the width of the display area, so as to ensure that the light beam emitted by the optical engine 100 can be completely projected on the screen. The display area of the curtain 202 .

Fig. 10 is a structural diagram of another projection device according to some embodiments.

Compared with FIG. 3 , the main difference between FIG. 10 is that the accommodating portion 300 in FIG. 10 includes a first accommodating portion 303 and a second accommodating portion 304 . The transparent area 301 is disposed on the first accommodating portion 303 , and the opening 302 is disposed on the second accommodating portion 304 . That is to say, the accommodating portion 300 in FIG. 10 is a separate piece, while the accommodating portion 300 in FIG. 3 is an integral piece.

In some embodiments, when the receiving part 300 is a separate piece, the length of the first receiving part 303 is smaller than the length of the second receiving part 304 . Alternatively, as shown in FIG. 10 , the accommodating portion 300 has a cuboid structure, and at this time the length of the first accommodating portion 303 is equal to the length of the second accommodating portion 304 .

For the convenience of description, the projection device 1000 will be described mainly in the orientation shown in FIG. The height directions of the projection screen 200 are up and down.

The optical engine 100 is configured to emit light beams to the projection screen 200 .

The projection screen 200 may include a base 201 , a curtain 202 , a lifting mechanism 203 , a curling mechanism 204 and a control mechanism 205 .

A first end of the lifting mechanism 203 is fixedly connected to the first side 202A of the screen 202 , and a second end of the lifting mechanism 203 is fixed on the base 201 . The lifting mechanism 203 is configured to control the unfolded curtain 202 to receive the light beam emitted by the optical engine 100 to realize the display of the projected image.

The curling mechanism 204 includes a roll 2041 which can be fixedly connected to the second side 202B of the curtain 202 . The drum 2041 is configured to rotate around the second side 202B of the curtain 202 to make the curtain 202 be retracted or unfolded.

It should be noted that the first side 202A of the screen 202 and the second side 202B of the screen 202 are two opposite sides. For example, the first side 202A of the curtain 202 is the side of the curtain 202 away from the base 201 (such as the upper side), and the second side 202B of the curtain 202 is the side of the curtain 202 close to the base 201 (as follows side).

When the curtain 202 includes the optical film 2021, the optical film 2021 is fixedly connected with the curling mechanism 204 and the lifting mechanism 203 respectively, and the flatness of the optical film 2021 can be improved by controlling and tensioning the optical film 2021 through the lifting mechanism 203 , which can be suitable for ultra-short-focus projection imaging applications.

The control mechanism 205 is fixed on the base 201 , and the control mechanism 205 is connected with the reel 2041 . The control mechanism 205 is configured to control the movement of the reel 2041 to drive the reel 2041 to rotate around the first side 202A of the curtain 202 after the curtain 202 is unfolded.

In some embodiments, after the lifting mechanism 203 unfolds the curtain 202, the control mechanism 205 in the projection screen 200 can control the roll 2041 to move in a specified direction. Since the first side 202A of the curtain 202 is fixedly connected to the lifting mechanism 203, the lifting mechanism 203 is fixed on the base 201, and the second side 202B of the curtain 202 is fixedly connected to the reel 2041, therefore, the control mechanism 205 controls the reel When the cylinder 2041 moves in a specified direction, the first side 202A of the curtain 202 will not move relative to the base 201, but the second side 202B of the curtain 202 will move relative to the base 201, so that the roll 2041 can The screen 202 is driven to rotate around the first side 202A of the screen 202 , thereby adjusting the tilt state of the screen 202 .

It should be noted that the above specified direction refers to a direction perpendicular to the plane where the screen 202 is located when the screen 202 is not tilted.

For example, when the curtain 202 is tilted forward after being unfolded by the lifting mechanism 203, when the control mechanism 205 drives the reel 2041 to move towards the observer in a specified direction, the second side 202B of the curtain 202 will move towards the observer relative to the base 201. Move such that the horizontal distance between the second side 202B of the curtain 202 and the observer is approximately equal to the horizontal distance between the first side 202A of the curtain 202 and the observer.

When the curtain 202 is tilted back after being unfolded by the lifting mechanism 203, the control mechanism 205 drives the reel 2041 to move away from the observer in a designated direction, and the second side 202B of the curtain 202 moves away from the observer relative to the base 201, The horizontal distance between the second side 202B of the curtain 202 and the observer is approximately equal to the horizontal distance between the first side 202A of the curtain 202 and the observer.

In this way, the probability of inclination (for example, forward or backward) of the curtain 202 after being unfolded by the lifting mechanism 203 can be effectively reduced, and the probability of problems such as distortion and blurring in the projected picture projected by the optical engine 100 on the curtain 202 can be reduced. The display effect of the projected picture on the curtain 202 is improved.

Fig. 11 is a partial perspective view of another projection device according to some embodiments. As shown in Figure 11, the control mechanism 205 includes an adjusting rod 2051 and a first slider 2052 connected to the adjusting rod 2051, the first slider 2052 is connected to the reel 2041, and the first slider 2052 is slidably connected to the base 201 connect.

The length direction of the adjusting rod 2051 intersects the length direction of the reel 2041 , for example, the length direction of the adjustment rod 2051 is perpendicular to the length direction of the reel 2041 . The adjusting rod 2051 is configured to drive the first slider 2052 to slide on the base 201 to drive the reel 2041 to move. In this way, after the curtain 202 in the projection screen 200 is unfolded, the adjusting rod 2051 controls the first slider 2052 to slide on the base 201, so that the reel 2041 also moves with the first slider 2052, so that the reel 2041 can go around the screen The first side 202A of 202 rotates.

In some embodiments, referring to FIG. 11 , the adjusting rod 2051 is a first lead screw 2051A, and the first slider 2052 is screwed to the first lead screw 2051A. The first lead screw 2051A can be configured to rotate around the central axis of the first lead screw 2051A, so as to drive the first slider 2052 to move in the length direction of the first lead screw 2051A, so that the first slider 2052 is on the base 201 slide. It should be noted that the rotation of the first lead screw 2051A around its central axis includes the rotation of the first lead screw 2051A around its own central axis along the first direction and the second direction. The first direction is one of clockwise and counterclockwise, and the second direction is the other of clockwise and counterclockwise.

When the first lead screw 2051A rotates around its central axis in the first direction, the first lead screw 2051A drives the first slider 2052 to move toward the observer in a specified direction, and the movement of the first slider 2052 makes the reel 2041 move along the Moves towards the viewer in the specified direction. After the second side 202B of the curtain 202 follows the reel 2041 and moves toward the observer in a designated direction, the horizontal distance between the second side 202B of the curtain 202 and the observer is approximately equal to the distance between the first side 202A of the curtain 202 and the observer. the horizontal distance between them.

When the first lead screw 2051A rotates around its central axis in the second direction, the first lead screw 2051A drives the first slider 2052 to move away from the observer in a specified direction, and the movement of the first slider 2052 makes the reel 2041 move along the Move in the specified direction away from the viewer. After the second side 202B of the curtain 202 follows the drum 2041 and moves away from the observer in a designated direction, the horizontal distance between the second side 202B of the curtain 202 and the observer is approximately equal to the distance between the first side 202A of the curtain 202 and the observer. the horizontal distance between them.

It should be noted that the direction in which the first lead screw 2051A rotates clockwise or counterclockwise around its central axis to drive the first sliding block 2052 to move depends on the direction of rotation of the threads of the first lead screw 2051A.

Fig. 12 is a partial perspective view of another projection device according to some embodiments, and Fig. 13 is an exploded view of the projection device in Fig. 12 . As shown in FIG. 12 and FIG. 13 , the first slider 2052 includes a first slider body 2052A and an adapter 2052B, and the first slider body 2052A is screwed to the adapter 2052B. For example, the adapter 2052B is a lead screw nut.

The first slider body 2052A includes a first through hole A1. The first slider body 2052A is sleeved on the first screw 2051A through the first through hole A1, and the adapter 2052B is sleeved on the first screw 2051A. Wherein, the diameter of the first through hole A1 in the first slider body 2052A is larger than the diameter of the first lead screw 2051A. In this way, the first slider body 2052A can move along the length direction of the first lead screw 2051A driven by the adapter 2052B.

When the curtain 202 is unfolded by the lifting mechanism 203 and tilted, the first lead screw 2051A can rotate around its own central axis (for example, clockwise or counterclockwise), and then the first lead screw 2051A can drive the adapter 2052B in the first position. When the lead screw 2051A moves, the adapter 2052B can drive the first slider body 2052A to move on the first lead screw 2051A, so that the first slider body 2052A drives the reel 2041 to move in a specified direction. In some embodiments, the control mechanism 205 further includes a first driving motor 2053 and a support frame 2054 . The supporting frame 2054 is fixedly connected with the base 201 . For example, the support frame 2054 includes a horizontal portion 2054A and a vertical portion 2054B, and the support frame 2054 is connected to the base 201 through the horizontal portion 2054A. The first driving motor 2053 and the first lead screw 2051A are respectively located on two sides of the vertical portion 2054B of the supporting frame 2054 . The first driving motor 2053 is fixedly connected to the vertical portion 2054B of the support frame 2054 .

For example, the first slider body 2052A and the adapter 2052B, and the first drive motor 2053 and the support frame 2054 are fixedly connected by means of screws or the like.

The first drive motor 2053 includes an output shaft B1 connected to one end of the first lead screw 2051A. The rotation of the first drive motor 2053 can drive the first lead screw 2051A to rotate around its central axis.

In some embodiments, the driving mode of the adjusting rod 2051 can also be manually. For example, an adjustment knob is provided at the end of the adjustment rod 2051 away from the first slider 2052 , and the adjustment knob 2051 is driven to rotate by manually rotating the adjustment knob, so that the first slider 2052 is driven to move through the adjustment rod 2051 .

In some embodiments, the control mechanism 205 also includes a coupling 2055 and a bearing 2056 . The vertical part 2054B of the support frame 2054 includes a through hole C1, the output shaft B1 of the first driving motor 2053 passes through the through hole C1 to connect with one end of the coupling 2055, and the other end of the coupling 2055 is connected with the first wire The one end of the bar 2051A is connected. The bearing 2056 is sleeved on the one end of the first lead screw 2051A, and the first lead screw 2051A is rotatably connected with the base 201 through the bearing 2056 . The connection between the first lead screw 2051A and the first driving motor 2053 can be realized through the coupling 2055 .

The whole process of adjusting the inclination state of the curtain 202 by the control mechanism 205 is as follows:

When the curtain 202 is tilted after being unfolded by the lifting mechanism 203, first, the first driving motor 2053 rotates, and its power is transmitted to the coupling 2055 through the output shaft of the first driving motor 2053, and the first screw is driven by the coupling 2055. 2051A rotates; then, the first lead screw 2051A drives the adapter 2052B to make the adapter 2052B move along the specified direction on the first lead screw 2051A, and the adapter 2052B drives the first slider body 2052A to make the first slider body 2052A Moves in the specified direction on the first lead screw 2051A. The first slider body 2052A drives the reel 2041 to move in a specified direction, so as to adjust the tilt state of the screen 202 .

Figure 14 is a block diagram of a control mechanism according to some embodiments. As shown in FIG. 14 , the adjusting rod 2051 is a telescopic rod 2051B, and the control mechanism 205 further includes a control body 2057 , and the control body 2057 includes a receiving cavity 2057A. A part of the telescopic rod 2051B is located in the receiving chamber 2057A, and an end of the telescopic rod 2051B away from the control body 2057 is fixedly connected to the first slider 2052 .

The control body 2057 is configured to control the expansion and contraction of the telescopic rod 2051B in the accommodating cavity 2057A, so as to drive the first slider 2052 to slide on the base 201 . In this way, after the curtain 202 in the projection screen 200 is unfolded, when the telescopic rod 2051B expands and contracts in the accommodating cavity 2057A under the control of the control body 2057, the telescopic rod 2051B can drive the first slider 2052 to move, so that the reel 2041 also moves with the second sliding block. A sliding block 2052 moves, so that the roll 2041 can rotate around the first side 202A of the curtain 202 .

For example, when the telescopic rod 2051B is located outside the receiving cavity 2057A, the telescopic rod 2051B drives the first slider 2052 to move toward the observer in a designated direction, and the movement of the first slider 2052 makes the reel 2041 move toward the observer in a designated direction. When the part of the telescopic rod 2051B shrinks in the accommodation cavity 2057A, the telescopic rod 2051B drives the first slider 2052 to move away from the observer along the specified direction, and the movement of the first slider 2052 makes the reel 2041 away from the observer along the specified direction. or move. It should be noted that the device composed of the telescopic rod 2051B and the control body 2057 can be a telescopic motor, telescopic pneumatic cylinder or telescopic hydraulic cylinder, etc.

Referring to FIG. 13 , one of the base 201 and the first slider 2052 in the projection screen 200 includes a bar-shaped protrusion D1, and the other of the base 201 and the first slider 2052 may include a bar-shaped protrusion D1. Matching bar groove E1.

For example, the base 201 includes a bar-shaped protrusion D1, and the first slider 2052 includes a bar-shaped groove E1 matching the bar-shaped protrusion D1. Alternatively, the first slider 2052 includes a bar-shaped protrusion D1, and the base 201 includes a bar-shaped groove E1 matching the bar-shaped protrusion D1.

For the convenience of description, the drawings in the present disclosure mainly illustrate that the base 201 includes a bar-shaped protrusion D1, and the first slider 2052 includes a bar-shaped groove E1 that matches the bar-shaped protrusion D1. However, this It should not be construed as a limitation of the present disclosure.

At least a part of the strip-shaped protrusion D1 is located in the strip-shaped groove E1. In this way, when the first slider 2052 moves along the length direction of the adjustment rod 2051, the cooperation between the strip-shaped protrusion D1 and the strip-shaped groove E1 is beneficial to improve the sliding stability between the first slider 2052 and the base 201 sex.

In some embodiments, the first slider 2052 in the control mechanism 205 includes a second through hole F1 , and one end of the reel 2041 is located in the second through hole F1 and is rotatably connected to the first slider 2052 . In this way, the curtain 202 can be retracted through the rotatable connection between the roll 2041 and the second through hole F1.

In some embodiments, projection device 1000 includes a control mechanism 205 . Alternatively, the projection device 1000 includes two control mechanisms 205 , and the two control mechanisms 205 may be respectively connected to two ends of the roll 2041 . In this way, the control mechanisms 205 at both ends of the reel 2041 simultaneously drive the reel 2041 to move, so as to drive the reel 2041 to rotate around the first side 202A of the curtain 202 . In this way, the probability of tilting of the curtain 202 after the curtain 202 is unfolded by the lifting mechanism 203 can be effectively reduced.

As shown in Figure 1, the lifting mechanism 203 includes a crossbeam 2031 and a lifting bracket 2032, the lifting bracket 2032 is connected to one side of the crossbeam 2031 extending along the length direction of the crossbeam 2031, and the other side of the crossbeam 2031 extending along the length direction The side is fixedly connected with the first side 202A of the screen 202 , and the lifting bracket 2032 is configured to control the screen 202 to expand or retract.

The length of the beam 2031 may be equal to the length of the first side 202A of the curtain 202 . In this way, the beam 2031 can fully control the curtain 202 along the length direction of the beam 2031 , thereby ensuring the smoothness of the curtain 202 .

Fig. 15 is a structural diagram of a projection screen in a retracted state according to some embodiments, and Fig. 16 is a structural diagram of a projection screen in an unfolded state according to some embodiments.

As shown in FIG. 15 or FIG. 16 , the projection screen 200 further includes a supporting body 207 . The supporting body 207 is fixedly connected with the base 201 , and the supporting body 207 is configured to carry the lifting mechanism 203 and the curtain 202 . The support body 207 may be a support board, a wall surface of a wall body, a support surface of a support cabinet, or a tabletop of a table, and the like.

The lifting mechanism 203 includes a driving assembly 2033 , a lifting bracket 2032 and a beam 2031 .

The driving assembly 2033 is connected with the supporting body 207 .

The lifting bracket 2032 includes a lifting rod 321 and an active rod 322. Both ends of the lifting rod 321 are rotatably connected to the support body 207 and the beam 2031 respectively, and both ends of the active rod 322 are rotatably connected to the drive assembly 2033 and the lifting rod 321 respectively.

The first side 202A of the curtain 202 is fixedly connected to the beam 2031 , and the second side 202B of the curtain 202 is fixedly connected to the curling mechanism 204 .

In some embodiments, the driving assembly 2033 is configured to drive one end (such as the lower end) of the active rod 322 to move to realize the raising or lowering of the other end (such as the upper end) of the active rod 322, and then the active rod 322 drives the elevating rod 321 rises or falls, to realize the rise or fall of beam 2031. In this way, under the cooperation of the curling mechanism 204 and the drive assembly 2033, the curtain 202 can be retracted or unfolded. When the projection screen 200 is not in use, the drive assembly 2033 drives the one end of the active rod 322 to move, so that the active rod 322 The other end descends, and at the same time, the curling mechanism 204 winds around the first side 202A of the curtain 202 to retract the curtain 202 , reducing the occupied space of the projection screen 200 .

Fig. 17 is a structural diagram of a connection structure of a rotatable connection according to some embodiments, and Fig. 18 is a force analysis diagram of a connection structure of a rotatable connection according to some embodiments.

In some embodiments, as shown in FIG. 17 , the above-mentioned connection structure at the rotatable connection includes a first connection part 1 , a second connection part 2 and a connection shaft 3 . The first connecting part 1 is disposed on one side of the second connecting part 2 , for example, the first connecting part 1 and the second connecting part 2 extend away from each other. The first connecting piece 1 includes a first connecting hole H1, the second connecting piece 2 includes a second connecting hole K1, and the connecting shaft 3 passes through the first connecting hole H1 and the second connecting hole I1 to realize the connection between the first connecting piece 1 and the second connecting hole I1. Rotatable connection of the second link 2. The first connecting piece 1 is fixedly connected to one end of the lifting rod 321, the active rod 322, the support body 207, the driving assembly 2033 and the beam 2031 (for example, the lifting rod 321), and the second connecting member 2 is connected to the lifting rod 321, the active One end of the other (for example, the active rod 322) in the rod 322, the support body 207, the drive assembly 2033 and the crossbeam 2031 is fixedly connected to realize the lifting rod 321, the active rod 322, the support body 207, the drive assembly 2033 and the crossbeam 2031. of two rotatable connections.

As shown in Figure 18, F1 represents the lateral shear force received by the joint of the connecting shaft 3 and the first connecting member 1, and F2 represents the lateral shearing force received by the connecting place of the connecting shaft 3 and the second connecting member 2 force.

Fig. 19 is a structural diagram of another connection structure of a rotatable connection according to some embodiments, and Fig. 20 is a force analysis diagram of another connection structure of a rotatable connection according to some embodiments.

In some embodiments, as shown in FIG. 19 , at least one of the multiple connection structures at the above-mentioned rotatable connection is a connection structure clamped on both sides, and the connection structure clamped on both sides includes a second connecting member 2. The third connecting piece 4 and the connecting shaft 3, the connecting shaft 3 is connected to the second connecting piece 2 and the third connecting piece 4 respectively.

The third connecting piece 4 includes a third connecting piece body 41 and two sidewalls 42 connected to the third connecting piece body 41 , and the two sidewalls 42 are disposed opposite to one side of the third connecting piece body 41 . The second connecting member 2 is disposed between the two side walls 42 . Each side wall 42 includes a third connecting hole J1 , and the connecting shaft 3 passes through the second connecting hole I1 and the third connecting hole J1 to realize the rotatable connection between the second connecting member 2 and the third connecting member 4 .

The second connecting piece 2 is fixedly connected with one end of the lifting rod 321, the active rod 322, the support body 207, the driving assembly 2033 and the beam 2031 (such as the driving assembly 2033), and the third connecting piece 4 is connected with the lifting rod 321, the active One end of the rod 322, the support body 207, the drive assembly 2033 and the crossbeam 2031 (such as the active rod 322) is fixedly connected to realize the lifting rod 321, the active rod 322, the support body 207, the drive assembly 2033 and the crossbeam 2031. of two rotatable connections.

As shown in Figure 20, F2 represents the lateral shear force received by the joint of the connecting shaft 3 and the second connecting member 2, and F3 represents the lateral shearing force received by the connecting place of the connecting shaft 3 and the third connecting member 4 Force, the direction of F2 is opposite to the direction of F3, and F2=2F3, make the shearing force of the two ends of connecting shaft 3 and the shearing force of middle part balance, like this, can slow down the wearing and tearing of connecting shaft 3, reduce lifting bracket 2032 deflection The probability of inclination is reduced, and the service life of the projection screen 200 is extended.

As shown in Figure 20, the connection structure clamped on both sides also includes a support block 5, the support block 5 includes a fourth connection hole K1, the connection shaft 3 is passed through the fourth connection hole K1, and the support block 5 is located on the third connection piece 4 Between one of the side walls 42 and the second connecting piece 2 . One end surface of the second connecting piece 2 is rotatably abutted against the supporting block 5 . In this way, the support of the second connecting member 2 by the supporting block 5 is beneficial to balance the lateral shearing force on the connecting shaft 3 , thereby prolonging the service life of the projection screen 200 .

There is a groove 52 on the side end surface of the support block 5 close to the second connecting piece 2, such as a cylindrical groove, and one end of the second connecting piece 2 includes a protrusion matching the groove 52, such as a cylindrical protrusion. The ends of the two connectors 2 are supported in the grooves on the support block 5 . In this way, the second connecting member 2 can be supported on the support block 5 and relatively rotate with the support block 5 .

Fig. 21 is a structural diagram of yet another connection structure of a rotatable connection according to some embodiments.

Compared with FIG. 21 and FIG. 19 , the main difference is that the third connecting piece 4 in FIG. 21 is a separate piece, while the third connecting piece 4 in FIG. 19 is a single piece. As shown in FIG. 21 , the third connecting part 4 includes a first sub-connecting part 43 and a second sub-connecting part 44 , and the second connecting part 2 is located between the first sub-connecting part 43 and the second sub-connecting part 44 .

The second connecting piece 2 is fixedly connected to one end of one of the lifting rod 321, the active rod 322, the support body 207, the drive assembly 2033 and the beam 2031, and the first sub-connecting part 43 and the second sub-connecting part 44 are arranged opposite to the lifting rod 321, the active rod 322, the support body 207, the drive assembly 2033 and the other end of the crossbeam 2031, to realize the rotatable movement of two of the elevating rod 321, the active rod 322, the support body 207, the drive assembly 2033 and the crossbeam 2031 connect.

It should be noted that a supporting block 5 may also be provided between the first sub-connecting part 43 and the second connecting part 2, or between the second sub-connecting part 44 and the second connecting part 2, so as to realize alignment through the supporting block 5. The support of the end of the second connecting piece 2 .

Fig. 22 is a structural diagram of another projection screen in an unfolded state according to some embodiments.

In some embodiments, as shown in FIG. 16 or FIG. 22 , the lifting rod 321 includes a driven rod 3211 and a supporting rod 3212; the first end of the driven rod 3211 includes a third connecting member 4, and the first end of the supporting rod 3212 It is rotatably connected with the beam 2031, the second end of the support rod 3212 includes the second connecting member 2, and the first end of the driven rod 3211 and the second end of the support rod 3212 form the above-mentioned connection structure clamped on both sides. The second end of the driven rod 3211 is rotatably connected to the support body 207 , and the active rod 322 is rotatably connected to the driven rod 3211 .

Between the first end of the driven rod 3211 and the second end of the supporting rod 3212 is a connection structure clamped on both sides, so that when the driven rod 3211 and the supporting rod 3212 rotate relatively, the driven rod 3211 and the supporting rod are avoided. The situation that the connecting shaft 3 between 3212 is subject to lateral shear force is beneficial to slow down the wear of the connecting shaft 3 here. When the active rod 322 is raised and lowered, the active rod 322 drives the driven rod 3211 to rise and fall, and the driven rod 3211 drives the supporting rod 3212 to rise and fall synchronously, so as to realize the raising or lowering of the beam 2031 .

Wherein, when the angle between the driven rod 3211 and the support rod 3212 becomes larger, the rise of the crossbeam 2031 can be realized; similarly, when the angle between the driven rod 3211 and the support rod 3212 becomes smaller, the Transom 2031 drop.

The first end of the driven rod 3211 includes a support block 5 , and the second end of the support rod 3212 is rotatably abutted against the support block 5 . In this way, the support of the support rod 3212 by the support block 5 can prevent the connection shaft 3 between the driven rod 3211 and the support rod 3212 from being subjected to lateral shearing force, thereby prolonging the service life of the lifting rod 321 .

In some embodiments, as shown in FIG. 22 , the active rod 322 includes a first power rod 3221 and a second power rod 3222; the first end of the first power rod 3221 and the first end of the second power rod 3222 are located respectively from The two opposite sides of the moving rod 3211, i.e. the first end of the first power rod 3221 and the first end of the second power rod 3222 jointly form the third connecting part 4 (i.e. split part), and a part of the driven rod 3211 forms the first Two connecting pieces 2, the first end of the first power rod 3221, the first end of the second power rod 3222 and the part of the driven rod 3211 form the above-mentioned connection structure clamped on both sides, the first Both the second end of the power rod 3221 and the second end of the second power rod 3222 are rotatably connected to the driving assembly 2033 .

When the curtain is unfolded, through the first power rod 3221 and the second power rod 3222 clamping on both sides of the driven rod 3211, avoiding being between the first power rod 3221, the driven rod 3211 and the second power rod 3222 When the connecting shaft 3 is subject to lateral shear force, it is beneficial to slow down the wear of the connecting shaft 3 here.

In other embodiments, as shown in FIG. 16 , the active rod 322 includes a third power rod 3224 , a fourth power rod 3225 and an auxiliary rod 3223 .

The first end of the auxiliary rod 3223 forms the third connecting piece 4 (i.e. an integral part), a part of the supporting rod 3212 is located between the two side walls 42 of the third connecting member 4, and the part of the supporting rod 3212 forms the second The connecting piece 2, the first end of the auxiliary rod 3223 and the part of the supporting rod 3212 form a connection structure clamped on both sides.

The first end of the third power rod 3224 and the first end of the fourth power rod 3225 are respectively located on opposite sides of the second end of the auxiliary rod 3223, that is, the first end of the third power rod 3224 and the end of the fourth power rod 3225. The first ends together form the third connecting piece 4 (i.e. split), the second end of the auxiliary rod 3223 forms the second connecting piece 2, the first end of the third power rod 3224, the first end of the fourth power rod 3225 and the second end of the auxiliary rod 3223 form a connection structure clamped on both sides.

The second end of the third power rod 3224, the second end of the fourth power rod 3225 and the driving assembly 2033 are rotatably connected. The driven rod 3211 is located between the third power rod 3224 and the fourth power rod 3225, and a part of the third power rod 3224 and a part of the fourth power rod 3225 jointly form the third connecting part 4 (ie, a split part). A part of the rod 3211 forms the second connecting member 2, and the part of the third power rod 3224, the part of the fourth power rod 3225 and the part of the driven rod 3211 form a connection clamped on both sides. structure.

When the curtain is unfolded, the third power rod 3224 and the driven rod 3211, and the fourth power rod 3225 and the driven rod 3211 form an X-shaped structure, and the auxiliary rod 3223 and the support rod 3212 form a λ-shaped structure, and pass through the third The clamping of both sides of the driven rod 3211 by the power rod 3224 and the fourth power rod 3225 prevents the connecting shaft 3 between the third power rod 3224, the fourth power rod 3225 and the driven rod 3211 from being subjected to lateral shearing The condition of the force is conducive to slowing down the wear of the connecting shaft 3 here, and clamping the two sides of the support rod 3212 by the first end of the auxiliary rod 3223, avoiding the position between the first end of the auxiliary rod 3223 and the support rod 3212 When the connecting shaft 3 is subject to lateral shear force, it is beneficial to slow down the wear of the connecting shaft 3 here.

In some embodiments, as shown in FIG. 15 or FIG. 16 , the supporting body 207 includes a plate body 2071, the lifting mechanism 203 is arranged on the side surface (such as the upper surface) of the plate body 2071 away from the ground, and the projection screen 200 includes two base plates. Seats 201 , two bases 201 are arranged on the upper surface of the board body 2071 and located at both ends of the board body 2071 in the length direction, and the two bases 201 are perpendicular to the board body 2071 . At this time, both ends of the curling mechanism 204 are respectively connected to the two bases 201 , the driving assembly 2033 is fixedly connected to the plate body 2071 , and the second end of the lifting rod 321 is rotatably connected to the plate body 2071 .

FIG. 23 is a structural view of another projection screen in a retracted state according to some embodiments; FIG. 24 is a partially enlarged view of circle A in FIG. 23 .

In some embodiments, as shown in FIGS. 23 and 24 , the drive assembly 2033 includes a second drive motor 311 , a conveyor belt assembly 312 , a second lead screw 313 and a plurality of second sliders 314 , and the second lead screw 313 is connected to the support The body 207 is rotatably connected, the plurality of second sliders 314 are screwed to the second lead screw 313, the plurality of second sliders 314 correspond to the plurality of elevating brackets 2032 one by one, the second end of the active rod 322 corresponds to the corresponding first The two sliders 314 are rotatably connected.

When the second screw 313 rotates, two adjacent second sliders 314 among the plurality of second sliders 314 approach or move away from each other; the second driving motor 311 is configured to drive the second screw 313 to rotate. For example, the output shaft 3111 of the second driving motor 311 is in driving connection with the second lead screw 313 through the conveyor belt assembly 312 .

The second drive motor 311 drives the curtain 202 to rise or fall as follows:

The second lead screw 313 is rotatably connected to the support body 207, so the second drive motor 311 can drive the second lead screw 313 to rotate in situ through the conveyor belt assembly 312 after the second drive motor 311 is started, and the second lead screw 313 drives the second slider 314 to rotate, thereby Make the second slide block 314 move on the second lead screw 313, drive the second end of the active rod 322 to move synchronously by the second slide block 314, to realize the rising or falling of the other end of the active rod 322; When rising or falling, the active rod 322 can drive the lifting rod 321 to rise or fall synchronously, so as to realize the rise or fall of the beam 2031 , and then realize the rise or fall of the curtain 202 .

The output shaft 3111 of the second driving motor 311 is parallel to the length direction of the second leading screw 313. For example, the second driving motor 311 is positioned at the side (lower side) near the ground of the second leading screw 313. The overall length of the mechanism 203 realizes the miniaturization of the projection screen 200 .

Figure 25 is a structural diagram of a second lead screw according to some embodiments.

The second lead screw 313 is one piece, and the helical directions of the threads at both ends of the second lead screw 313 are opposite. At this time, the conveyor belt assembly 312 can be connected to the end of the second lead screw 313 or the middle position of the second lead screw 313; or , the second lead screw 313 is a split piece, as shown in Figure 25, the second lead screw 313 includes a first sub-screw 3131 and a second sub-screw 3132, at this time the conveyor belt assembly 312 is simultaneously connected with the first sub-screw 3131 and the second sub-screw 3132 are connected at positions close to each other, that is, the conveyor belt assembly 312 is connected at the position between the first sub-screw 3131 and the second sub-screw 3132, after the connection, the first sub-screw 3131 and the second sub-screw 3131 The screw threads of the two sub-leading screws 3132 are in opposite directions.

In some embodiments, the second lead screw 313 may include more than two sub-screws, for example, the second lead screw 313 includes four sub-screws, six sub-screws, or eight sub-screws.

As shown in Figure 24, the driving assembly 2033 also includes a guide rod 315, the guide rod 315 is fixed on the base 201, and a plurality of second sliders 314 are slidably connected with the guide rod 315, which ensures the stability of the second slider 314 sliding sex.

In some embodiments, the conveyor belt assembly 312 is configured to decelerate the rotation speed of the second driving motor 311 to reduce the rotation speed of the second lead screw 313 .

The conveyor belt assembly 312 includes at least one stage of pulley assembly, each stage of pulley assembly includes a driven pulley, a driving pulley, and a conveyor belt respectively connected to the driving pulley and the driven pulley, the diameter of the driving pulley is smaller than the diameter of the driven pulley, and two adjacent stages In the pulley assembly, the driven pulley of one stage of the pulley assembly is coaxially fixedly connected with the driving pulley of the other stage of the pulley assembly.

Figure 26 is a block diagram of a conveyor belt assembly according to some embodiments.

The following mainly takes the conveyor belt assembly 312 including a two-stage pulley assembly as an example for illustration. As shown in FIG. The first conveyor belt 3125 and the second conveyor belt 3126 .

The first pulley 3122 and the second pulley 3123 are respectively rotatably connected to the gearbox body 3121, the first pulley 3122 is fixedly connected to the output shaft 3111 of the second driving motor 311, and the third pulley 3124 is sleeved on the second wire On the rod 313, and fixedly connected with the second lead screw 313. The second pulley 3123 includes a first circular groove 3123A and a second circular groove 3123B, and the diameter of the first circular groove 3123A is larger than that of the second circular groove 3123B. The first conveyor belt 3125 is set on the first circular groove 3123A of the second pulley 3123 and the first pulley 3122, and the second conveyor belt 3126 is set on the second circular groove 3123B of the second pulley 3123 and the third pulley 3124 .

The first pulley 3122 is used as the driving pulley of the first-stage pulley assembly, the first circular groove 3123A on the second pulley 3123 is used as the driven pulley of the first-stage pulley assembly, and the second circular groove on the second pulley 3123 is 3123B is used as the driving pulley of the second-stage pulley assembly, the third pulley 3124 is used as the driven pulley of the second-stage pulley assembly, and the outer diameter of the first pulley 3122 is smaller than the diameter of the first circular groove 3123A of the second pulley 3123 , the outer diameter of the second circular groove 3123B of the second pulley 3123 is smaller than the diameter of the third pulley 3124 . In this way, the rotation speed of the second driving motor 311 can be reduced through the two-stage pulley assembly, thereby reducing the rotation speed of the second lead screw 313 .

It should be noted that, when the conveyor belt assembly 312 drives the second lead screw 313 to rotate, in order to avoid slipping between each pulley and the corresponding conveyor belt, as shown in FIG. It is movably connected with the gearbox body 3121 , and the limiting member 3127 is pressed against the surface of the first conveyor belt 3125 or the second conveyor belt 3126 away from the corresponding pulley. In this way, by tightening the first conveyor belt 3125 or the second conveyor belt 3126 through the limiting member 3127, slipping between the conveyor belt and the corresponding pulley can be avoided.

Fig. 27 is a partial structural view of a curtain according to some embodiments, and Fig. 28 is a partial enlarged view at circle D in Fig. 27 .

As shown in FIG. 27 and FIG. 28 , the dimension of the optical film 2021 along the length direction of the curling mechanism 204 is smaller than the dimension of the flexible carrier 2022 along the length direction of the curling mechanism 204 . In this way, when the optical film 2021 is fixed on the flexible carrier 2022, the edge of the optical film 2021 will not be located outside the flexible carrier 2022, thereby improving the fixing efficiency of the optical film 2021.

In some embodiments, the dimension of the optical film 2021 along the length direction of the curling mechanism 204 may also be equal to the dimension of the flexible carrier 2022 along the length direction of the curling mechanism 204 . In this way, when the optical film 2021 is fixed, it is convenient to align the edge of the optical film 2021 with the edge of the flexible carrier 2022 , and the display picture can be the entire curtain 202 , thereby improving the picture display effect of the curtain 202 .

As shown in FIG. 5 to FIG. 7 , the projection screen further includes a plurality of tensioning mechanisms 206 , and two ends of each tensioning mechanism 206 in the plurality of tensioning mechanisms 206 are respectively fixedly connected to the curling mechanism 204 and the beam 2031 . A part of each tensioning mechanism 206 (such as the middle part except two ends) is fixed with the screen 202, and the orthographic projection of the tensioning mechanism 206 on the plane where the screen 202 is located is located on the screen 202, thereby avoiding the tensioning mechanism 206 The exposed middle part of the projection screen improves the aesthetics of the projection screen.

The foregoing embodiment can make the curtain 202 in a taut state by the tension mechanism 206 when the curtain 202 is unfolded, so as to avoid deformation of the curtain 202. At the same time, the stress parallel to the first side 202A of the curtain 202 experienced by the curtain 202 can be distributed among the multiple tensioning mechanisms 206 , reducing the possibility of deformation of the curtain 202 .

In some embodiments, the length direction of the tensioning mechanism 206 is perpendicular to the first side 202A of the curtain 202, so that the stress parallel to the first side 202A of the curtain 202 that the curtain 202 is subjected to can be largely dispersed in the tension. On the tightening mechanism 206, the stress that the curtain 202 bears is reduced.

In some embodiments, the tensioning mechanism 206 may use a material with a relatively high tensile modulus. For example, the tensioning mechanism 206 is a fishing line, a nylon line, or a steel wire rope. In this way, the bending deformation of the tensioning mechanism 206 can be avoided, and the tensioning effect of the tensioning mechanism 206 on the screen 202 can be improved.

In some embodiments, when the curtain 202 includes an optical film 2021, one side surface (for example, the front side) of the optical film 2021 is configured to display a picture, and the tensioning mechanism 206 is arranged on the side of the optical film 2021 and the one side of the optical film 2021. The surface opposite to the side surface (for example, the back surface), or the tension mechanism 206 and the optical film 2021 are integrally structured.

When the tensioning mechanism 206 is arranged on the back of the optical film 2021 , the tensioning mechanism 206 is fixedly connected to the back of the optical film 2021 . Figure 29 is a partial structural view of another screen according to some embodiments.

The connection manner between the tensioning mechanism 206 and the optical film 2021 may be as follows: the tensioning mechanism 206 is fixedly connected to the back of the optical film 2021 by bonding or the like. Or, as shown in FIG. 29 , the curtain 202 further includes an accommodating pocket 2023, the accommodating pocket 2023 is arranged on one side of the optical film 2021 perpendicular to the first side 202A, and the tensioning mechanism 206 is passed through the accommodating pocket. 2023, to realize the fixation of the middle part of the tensioning mechanism 206. Certainly, the connection manner between the tensioning mechanism 206 and the optical film 2021 is not limited to this.

In some embodiments, when the curtain 202 includes a flexible carrier 2022 and an optical film 2021, since the flexible carrier 2022 will not affect the display screen, the middle part of the tensioning mechanism 206 can be arranged on the flexible carrier 2022, of course, also The middle part of the tensioning mechanism 206 can be disposed on the back of the optical film 2021 .

In the case that the tensioning mechanism 206 is disposed on the flexible carrier 2022 , the middle part of the tensioning mechanism 206 can be fixedly connected with the flexible carrier 2022 . Alternatively, as shown in FIG. 27 and FIG. 28 , the accommodation pocket 2023 is disposed on the back of the flexible carrier 2022 , and the tightening mechanism 206 is passed through the accommodation pocket 2023 to fix the middle part of the tension mechanism 206 .

For example, two sides of the flexible carrier 2022 perpendicular to the length direction of the first side 202A of the curtain 202 are folded along the back of the flexible carrier 2022 and fixed to the back of the flexible carrier 2022 to obtain the accommodating pocket 2023 . At this time, the accommodating pocket 2023 is located on the back of the flexible carrier 2022. In this way, not only the accommodating pocket 2023 can be avoided from being exposed, but also the tensioning mechanism 206 can be avoided, which improves the overall aesthetics of the projection screen.

When the tensioning mechanism 206 is fixedly connected to the flexible carrier 2022, the tensioning mechanism 206 is located at the back of the flexible carrier 2022, that is, the tensioning mechanism 206 is fixedly connected to the back of the flexible carrier 2022, or the tensioning mechanism 206 is fixed on the flexible carrier 2022 front. Of course, the tensioning mechanism 206 can also be integrated with the flexible carrier 2022 .

When the tension mechanism 206 is fixed on the front of the flexible carrier 2022, in order to avoid affecting the aesthetics of the projection screen due to the exposure of the tension mechanism 206, the material of the tension mechanism 206 is a transparent material. For example, tensioning mechanism 206 is a transparent fishing line.

Fig. 30 is a structural diagram of another projection screen according to some embodiments, Fig. 31 is a partial enlarged view of circle E in Fig. 30, Fig. 32 is a partial enlarged view of circle F in Fig. 30, and Fig. 33 is a partial enlarged view of circle F in Fig. 30 The partial enlarged view at the middle circle G, and Fig. 34 is the partial enlarged view at the middle circle H in Fig. 30 .

In some embodiments, as shown in FIG. 30 to FIG. 34 , the multiple tensioning mechanisms 206 include a first tensioning member 2061 and a second tensioning member 2062, and the first tensioning member 2061 is arranged on the curtain 202 and the first tensioning member 2062. side 202A vertical side (for example, the third side 202C), the second tension member 2062 is arranged on the other side of the curtain 202 perpendicular to the first side 202A (for example, the fourth side 202D ), the third side 202C is opposite to the fourth side 202D. In this way, the third side 202C of the screen 202 can be tightened by the first tensioning member 2061, the fourth side 202D of the curtain 202 can be tightened by the second tensioning member 2062, and the third side 202D of the curtain 202 can be tightened by the first tensioning member 2061. Cooperating with the second tensioning member 2062 can disperse the force on the screen 202 in the direction parallel to the first side 202A, thereby ensuring the tensioning effect of the multiple tensioning members 4 on the screen 202 . When the first tension member 2061 and the second tension member 2062 distribute the force on the third side 202C and the fourth side 202D of the curtain 202, in order to better ensure that the first tension member 2061 and the second tension The tensioning effect of the tensioning member 2062 on the curtain 202 in the direction parallel to the first side 202A, as shown in FIGS. 30 to 34 , the first end of the first tensioning member 2061, the The first ends are respectively connected to the beams 2031. When the length of the first side 202A of the curtain 202 is less than the length of the beams 2031, the first ends of the first tensioning members 2061 are biased toward one end of the corresponding beams 2031, and the second tensioning members The first end of 2062 is biased toward one end of the corresponding beam, that is, the distance between the end of the first tensioning member 2061 connected to the beam and the end of the second tensioning member 2062 connected to the beam is greater than the length of the first side 202A of the curtain 202 .

The second end of the first tensioning member 2061 and the second end of the second tensioning member 2062 are connected to the curling mechanism 204. When the length of the second side 202B of the curtain 202 is less than the length of the curling mechanism 204, the first tensioning The second end of the member 2061 is biased toward one end of the corresponding curling mechanism 204, and the second end of the second tensioning member 2062 is biased toward one end of the corresponding curling mechanism 204, that is, the first tensioning member 2061 is connected to one end of the curling mechanism 204 and the second tensioning member 2061. The distance between the ends of the two tension members 2062 connected to the curling mechanism 204 is greater than the length of the second side 202B of the curtain 202 .

In this way, when the first tensioning member 2061 and the second tensioning member 2062 are tightened, a force acting away from the center can be applied to the curtain 202 in a direction parallel to the first side 202A of the curtain 202, thereby The force offsets the stress of the curtain 202 towards the center of the curtain 202, improves the tension effect of the first tension member 2061 and the second tension member 2062 on the third side 202C and the fourth side 202D of the curtain 202, and solves the deformation of the curtain 202 The problem.

The above is only a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Anyone familiar with the technical field who thinks of changes or substitutions within the technical scope of the present disclosure should cover all within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be determined by the protection scope of the claims.

Claims

A projection device comprising:

A projection screen configured to display a projection screen, the projection screen comprising:

base;

a lifting mechanism, the lifting mechanism is connected to the base;

a curtain, the first side of the curtain is connected to the lifting mechanism;

a curling mechanism coupled to the second side of the screen; and

A control mechanism, the control mechanism is arranged on the base and connected to the curling mechanism, the control mechanism is configured to: control the movement of the curling mechanism, and drive the curling mechanism to roll up the second side side to adjust the pitch angle of the screen; and

The optical engine is configured to emit light beams to the projection screen.
The projection device according to claim 1, wherein the control mechanism comprises:

a first slider, the first slider is slidably connected to the base, and the first slider is connected to the curling mechanism; and

The adjusting rod, which is connected to the first slider, is configured to drive the first slider to slide on the base, so as to drive the curling mechanism to move.
The projection device according to claim 2, wherein the adjusting rod is a first lead screw, and the first lead screw is screwed to the first slider.
The projection device according to claim 2, wherein the control mechanism further comprises:

A first drive motor, the first drive motor is arranged on the base, and the output shaft of the first drive motor is connected to the adjustment rod.
The projection device according to claim 2, wherein,

The adjusting rod is a telescopic rod;

The control mechanism also includes:

A control body, the control body is connected to the base, the control body includes a housing chamber, a part of the telescopic rod is located in the housing chamber, and an end of the telescopic rod far away from the control body is connected to the The first slider is connected, and the control body is configured to control the expansion and contraction of the telescopic rod in the accommodating cavity, so as to drive the first slider to slide on the base.
The projection device according to claim 2, wherein the first slider comprises: a first through hole, the adjustment rod is passed through the first through hole, and the first slider is adjusted relative to the first through hole. the rod is slidable; and

The second through hole, one end of the curling mechanism is passed through the second through hole, so that the curling mechanism is connected with the first slider.
The projection device according to claim 1, wherein the lifting mechanism comprises:

a beam connected to the first side of the screen;

a drive assembly connected to the base;

Lifting frame, the lifting frame includes a lifting rod and an active rod, the two ends of the lifting rod are respectively rotatably connected to the base and the beam, and the two ends of the active rod are respectively connected to the drive assembly and the The lifting rod is rotatably connected, and the driving assembly is configured to drive one end of the active rod to move, so as to drive the rise of the crossbeam by raising or lowering the other end of the active rod and the lifting rod. or lower.
The projection device according to claim 7, wherein the lifting mechanism further comprises:

A plurality of connecting structures, the two ends of the lifting rod are rotatably connected with the base and the beam through the multiple connecting structures, the two ends of the active rod are connected with the driving assembly and the lifting rod The rods are rotatably connected through the plurality of connecting structures; each connecting structure includes a first connecting piece, a second connecting piece and a connecting shaft, and the first connecting piece and the second connecting piece are respectively located at the connecting On both sides of the shaft along the shaft, the first connecting piece and the second connecting piece extend away from each other, and the connecting shaft passes through the first connecting piece and the second connecting piece.
The projection device according to claim 7, wherein the lifting mechanism further comprises:

A plurality of connecting structures, the two ends of the lifting rod are rotatably connected with the base and the beam through the multiple connecting structures, the two ends of the active rod are connected with the driving assembly and the lifting rod The rods are rotatably connected through the plurality of connection structures; at least one of the plurality of connection structures is a connection structure clamped on both sides, and the connection structure clamped on both sides includes the second connecting piece, A third connecting piece and a connecting shaft, the third connecting piece is configured to clamp opposite sides of the second connecting piece, and the connecting shaft passes through the second connecting piece and the third connecting piece pieces.
The projection device according to claim 9, wherein the third connecting member satisfies one of the following:

The third connector includes a third connector body and two side walls, the two side walls are oppositely disposed on the same side of the third connector body, and are located on opposite sides of the second connector. The two sides, and the connecting shaft passes through the second connecting piece and the two side walls;

or,

The third connecting piece includes a first sub-connecting piece and a second sub-connecting piece, the first sub-connecting piece and the second sub-connecting piece are arranged on opposite sides of the second connecting piece, and the The connection shaft passes through the first sub-connection piece, the second connection piece and the second sub-connection piece.
The projection device according to claim 9, wherein the connection structure clamped on both sides further includes a support block, the support block is arranged between the second connection part and the third connection part, the One side surface of the second connecting piece abuts against the supporting block, and the connecting shaft passes through the supporting block.
The projection device according to claim 9, wherein the lifting rod comprises:

a support rod, the first end of which is rotatably connected to the beam; and

The driven rod, the first end of the driven rod is rotatably connected to the second end of the support rod through the connection structure clamped by the two sides, and the second end of the driven rod is connected to the base Rotatable connection.
The projection device according to claim 12, wherein the active rod comprises a first power rod and a second power rod; the first end of the first power rod and the first end of the second power rod are jointly configured as the third connecting piece, a part of the driven rod is configured as the second connecting piece, and the first end of the first power rod, the first end of the second power rod and the part of the driven rod are configured as a connection structure clamped by the two sides;

The second end of the first power rod and the second end of the second power rod are rotatably connected to the driving assembly.
The projection device according to claim 12, wherein the active lever comprises a third power lever, a fourth power lever and an auxiliary lever;

The first end of the third power rod and the first end of the fourth power rod are jointly configured as the third connecting member, a part of the auxiliary rod is configured as the second connecting member, and the The first end of the third power rod, the first end of the fourth power rod and the part of the auxiliary rod are configured as a connection structure sandwiched by both sides;

The second end of the third power rod and the second end of the fourth power rod are rotatably connected to the drive assembly;

A part of the driven rod is configured as the second connecting member, a part of the third power rod and a part of the fourth power rod are jointly configured as the third connecting member, and the driven rod The part, the part of the third power rod and the part of the fourth power rod are configured as a connection structure clamped on both sides;

The first end of the auxiliary rod forms the third connecting member, a part of the supporting rod is configured as the second connecting member, and the first end of the auxiliary rod and the supporting rod A part is configured as the connection structure clamped by the two sides.
The projection device according to claim 7, wherein the drive assembly comprises:

second drive motor;

a conveyor belt assembly, the output shaft of the second driving motor is connected to the conveyor belt assembly;

a second lead screw, the second lead screw is in transmission connection with the conveyor belt assembly, and the second lead screw is rotatably connected with the base and the active rod respectively; and

A second slide block, the second slide block is threadedly connected with the second lead screw.
The projection device according to claim 15, wherein, the driving assembly comprises a plurality of the second sliders, the lifting mechanism comprises a plurality of lifting frames, the plurality of second sliders and the plurality of power rod connection in the lifting frame;

The second lead screw includes a plurality of threads, and two adjacent threads in the plurality of threads have opposite directions of rotation, and the plurality of threads correspond to the plurality of second sliders one by one.
The projection apparatus of claim 15, wherein the conveyor belt assembly comprises:

gearbox body;

a first pulley, the first pulley is rotatably connected to the gearbox body, and connected to the output shaft of the second drive motor;

A second pulley, the second pulley is rotatably connected to the gearbox body, the second pulley includes a first circular groove and a second circular groove, the diameter of the second circular groove is smaller than that of the first circular groove a diameter of a circular groove, and the diameter of the first pulley is smaller than the diameter of the first circular groove;

The third pulley, the third pulley is sleeved on the second lead screw and fixedly connected with the second lead screw, the diameter of the second circular groove is smaller than the outer diameter of the third pulley path;

a first conveyor belt, the first conveyor belt is sleeved on the first circular groove of the second pulley and the first pulley; and

The second conveyor belt is sleeved on the second circular groove of the second pulley and the third pulley.
The projection device according to claim 17, wherein the conveyor belt assembly further comprises a limiter, the limiter is connected to the gearbox body, and the limiter is pressed against the first conveyor belt or the The surface of the second conveyor belt away from the side of the corresponding pulley.
The projection device according to claim 1, wherein the lifting mechanism comprises a beam connected to the first side of the screen;

The projection screen also includes a tensioning mechanism, the first end of the tensioning mechanism is connected to the crossbeam, and the second end of the tensioning mechanism is connected to the curling mechanism, located between the first end and the At least a portion of the tensioning mechanism between the second ends is connected to the screen.
The projection device according to claim 19, wherein the two sides of the screen perpendicular to the length direction of the first side are folded along one side surface of the screen, and The surface is fixed to form an accommodating pocket, and the tightening mechanism is passed through the accommodating pocket to fix at least a part of the tightening mechanism.