CN215729260U

CN215729260U - Projection device

Info

Publication number: CN215729260U
Application number: CN202122354211.3U
Authority: CN
Inventors: 陈友才; 杨长明
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-02-01
Anticipated expiration: 2031-09-27

Abstract

The application discloses projection equipment belongs to projection technical field. The projection apparatus includes: the device comprises a base, a curtain sheet, a lifting mechanism, a curling mechanism and a transmission assembly. Because the first side of curtain and the elevating system fixed on the base are fixedly connected, the second side of curtain and the reel are fixedly connected, and the reel is connected with the transmission component. Therefore, when the transmission assembly drives the winding drum to move along the designated direction, the first side edge of the curtain sheet cannot move relative to the base, and the second side edge of the curtain sheet can move relative to the base. Such that the horizontal distance between the second side of the screen and the viewer is approximately equal to the horizontal distance between the first side of the screen and the viewer. So, can effectually reduce the curtain and take place the probability of slope after being expanded by elevating system for the projection picture that projection host computer projected on the curtain appears the probability reduction of bad problems such as distortion and fuzzy distortion, and then makes the display effect of the projection picture on the curtain better.

Description

Projection device

Technical Field

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. At present, a projection device mainly comprises a projection host and a projection screen. The light outlet side of the projection host faces the projection screen to emit light beams to the projection screen, and the projection screen is used for reflecting the light beams to realize the display of pictures.

Projection screens generally include: the curtain piece, curling mechanism and elevating system. One side of the curtain sheet is connected with the curling mechanism, and the other side of the curtain sheet is connected with the lifting mechanism. The curtain sheet can be retracted through the control of the curling mechanism, and can be unfolded through the control of the lifting mechanism.

However, after the curtain is unfolded by the lifting mechanism, the curtain is very prone to tilt. After the screen is inclined, the projection picture projected onto the screen by the projection host has poor problems of distortion, fuzzy distortion and the like, and further the display effect of the projection picture on the screen is poor.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a projection device. The screen film of the prior art can be solved and after the screen film is inclined, the projection picture projected on the screen film by the projection host machine has the problems of distortion, fuzzy distortion and the like, and the technical scheme is as follows:

there is provided a projection device, comprising:

the projection host is used for emitting a light beam;

the projection screen comprises a base, a screen piece, a lifting mechanism, a curling mechanism and a transmission assembly;

the lifting mechanism is fixed on the base, the lifting mechanism is fixedly connected with the first side edge of the curtain sheet, and the lifting mechanism is configured to: controlling the curtain to expand to receive the light beam;

the curling mechanism has a roller fixedly connected to the second side of the curtain, the curling mechanism configured to: driving the winding drum to rotate to control the curtain sheet to be folded, wherein the second side edge is opposite to the first side edge;

the transmission assembly is fixed on the base and is connected with the winding drum, and the transmission assembly is configured to: after the curtain sheet is unfolded, the winding drum is controlled to move so as to drive the curtain sheet to rotate around the first side edge.

The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:

a projection device comprises a projection host and a projection screen, wherein the projection screen can comprise a base, a screen, a lifting mechanism, a curling mechanism and a transmission component. Because the first side of curtain piece and the elevating system fixed connection who fixes on the base, the second side and the reel fixed connection of curtain piece, the reel and the drive assembly in the crimping mechanism are connected. Therefore, when the transmission assembly drives the winding drum to move along the designated direction, the first side edge of the curtain sheet cannot move relative to the base, and the second side edge of the curtain sheet can move relative to the base. Such that the horizontal distance between the second side of the screen and the viewer is approximately equal to the horizontal distance between the first side of the screen and the viewer. Therefore, the probability that the screen is inclined (inclined forwards or inclined backwards) after being unfolded by the lifting mechanism can be effectively reduced, the probability that the projection picture projected onto the screen by the projection host is distorted, blurred distortion and other undesirable problems is reduced, and the display effect of the projection picture on the screen is better.

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 diagram illustrating an effect of a screen displayed in different states;

FIG. 2 is a side view of a projection device provided in an embodiment of the present application;

FIG. 3 is a schematic diagram of the structure of the projection device shown in FIG. 2;

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

FIG. 5 is a schematic structural diagram of another projection apparatus provided in an embodiment of the present application;

FIG. 6 is an exploded view of the projection device shown in FIG. 5;

FIG. 7 is a schematic structural diagram of another projection apparatus provided in an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a projection apparatus according to another embodiment of the present application;

fig. 9 is a schematic diagram of a lifting mechanism in a projection apparatus according to an embodiment of the present disclosure.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

At present, after the screen is unfolded by the lifting mechanism, the screen is easy to incline (for example, the screen is inclined because of low precision when assembling the screen, the curling mechanism and the lifting mechanism in the projection screen). There are generally two possible situations in which the curtain tilts, the first being that the curtain tilts forward, i.e. the horizontal distance between the viewer and the side of the curtain connected to the winding mechanism is greater than the horizontal distance between the viewer and the side of the curtain connected to the lifting mechanism; in the second case, the screen is tilted backward, and the horizontal distance between the viewer and the side of the screen connected to the curling mechanism is smaller than the horizontal distance between the viewer and the side of the screen connected to the lifting mechanism.

The two kinds of screen films are inclined, which results in poor display effect of the projection picture on the screen film. For example, referring to fig. 1, fig. 1 is a diagram illustrating an effect of a screen displayed in different states of a screen. When the screen is not inclined, the shape of the projection picture on the screen can be the shape of the picture 01, and the projection picture on the screen has no problems of distortion, fuzzy distortion and the like. When the screen is inclined forward, the shape of the projection picture on the screen can be the shape of the picture 02; when the screen is tilted backwards, the shape of the projected picture on the screen may be the shape of the picture 03. No matter the screen is inclined forward or inclined backward, the projected picture on the screen has the problems of distortion, fuzzy distortion and the like, and the display effect of the projected picture on the screen is poor.

Referring to fig. 2 and fig. 3, fig. 2 is a side view of a projection apparatus provided in an embodiment of the present application, and fig. 3 is a schematic structural diagram of the projection apparatus shown in fig. 2. Projection device 000 may include: a projection host 100 and a projection screen 200.

The projection host 100 may be used to emit the light beam.

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

The lifting mechanism 203 of the projection screen 200 is fixed on the base 201, and the lifting mechanism 203 can be fixedly connected with the first side 202a of the curtain sheet 202. Wherein the lifting mechanism 203 may be configured to: the control curtain sheet 202 is expanded to receive the light beam emitted from the projection host 100, so as to realize the display of the projection picture.

The curling mechanism 204 in the projection screen 200 may have a reel 2041, and the reel 2041 may be fixedly connected to the second side edge 202b of the curtain sheet 202, wherein the curling mechanism 204 may be configured to: the roller 2041 is driven to rotate to control the curtain sheet 202 to retract.

It should be noted that the first side 202a of the curtain sheet 202 and the second side 202b of the curtain sheet 202 can be two opposite sides. Thus, when the lifting mechanism 203 is fixedly connected to the first side 202a of the curtain sheet 202 and the winding drum 2041 of the winding mechanism 204 is fixedly connected to the second side 202b of the curtain sheet 202, the lifting mechanism 203 can control the curtain sheet 202 to be unwound and the winding drum 2041 can control the curtain sheet 202 to be wound up by rotation.

The transmission assembly 205 in the projection screen 200 may be fixed on the base 201, and the transmission assembly 205 may be connected with the winding drum 2041, and the transmission assembly 205 may be configured to: after the curtain sheet 202 is unwound, the control roller 2041 moves to drive the curtain sheet 202 to rotate around the first side 202a of the curtain sheet 202.

In the embodiment of the present application, after the lifting mechanism 203 in the projection screen 200 unwinds the curtain sheet 202, the driving assembly 205 in the projection screen 200 can control the winding drum 2041 to move in a designated direction. Because the lifting mechanism 203 is fixed on the base 201 and is fixedly connected to the first side 202a of the curtain sheet 202, and the second side 202b of the curtain sheet 202 is fixedly connected to the winding drum 2041. Therefore, when the driving assembly 205 controls the drum 2041 to move in a specific direction, the first side 202a of the curtain sheet 202 does not move relative to the base 201, and the second side 202b of the curtain sheet 202 moves relative to the base 201, so that the drum 2041 can drive the curtain sheet 202 to rotate around the first side 202a of the curtain sheet 202, and the tilt state of the curtain sheet 202 can be adjusted. Wherein, the designated direction is as follows: when the curtain sheet 202 is not tilted, the direction perpendicular to the curtain sheet 202.

For example, when the curtain sheet 202 tilts forward after being unfolded by the lifting mechanism 203, the first side 202a of the curtain sheet 202 is fixedly connected to the lifting mechanism 203 fixed on the base 201, the second side 202b of the curtain sheet 202 is fixedly connected to the winding drum 2041, and the winding drum 2041 in the winding mechanism 204 is connected to the transmission assembly 205. Therefore, when the driving assembly 205 drives the rolling drum 2041 to move toward the viewer along the designated direction, the first side 202a of the curtain sheet 202 does not move relative to the base 201, and the second side 202b of the curtain sheet 202 moves toward the viewer relative to the base 201, so that the rolling drum 2041 can drive the curtain sheet 202 to rotate clockwise around the first side 202a of the curtain sheet 202. Such that the horizontal distance between the second side 202b of the curtain 202 and the viewer is approximately equal to the horizontal distance between the first side 202a of the curtain 202 and the viewer.

When the curtain sheet 202 is unfolded by the lifting mechanism 203 and then tilted backwards, the first side 202a of the curtain sheet 202 is fixedly connected to the lifting mechanism 203 fixed on the base 201, the second side 202b of the curtain sheet 202 is fixedly connected to the winding drum 2041, and the winding drum 2041 of the winding mechanism 204 is connected to the transmission assembly 205. Therefore, when the driving assembly 205 drives the winding drum 2041 to move away from the viewer along a predetermined direction, the first side 202a of the curtain sheet 202 does not move relative to the base 201, and the second side 202b of the curtain sheet 202 moves away from the viewer relative to the base 201, so that the winding drum 2041 can drive the curtain sheet 202 to rotate counterclockwise around the first side 202a of the curtain sheet 202. Such that the horizontal distance between the second side 202b of the curtain 202 and the viewer is approximately equal to the horizontal distance between the first side 202a of the curtain 202 and the viewer.

Thus, the probability of the screen 202 being inclined (forward or backward) after being unfolded by the lifting mechanism 203 can be effectively reduced, so that the probability of the projection picture projected onto the screen 202 by the projection host 100 having undesirable problems such as distortion and fuzzy distortion is reduced, and the display effect of the projection picture on the screen 202 is better.

In summary, the projection apparatus provided in the embodiments of the present application includes a projection host and a projection screen, and the projection screen may include a base, a screen, a lifting mechanism, a curling mechanism, and a transmission assembly. Because the first side of curtain piece and the elevating system fixed connection who fixes on the base, the second side and the reel fixed connection of curtain piece, the reel and the drive assembly in the crimping mechanism are connected. Therefore, when the transmission assembly drives the winding drum to move along the designated direction, the first side edge of the curtain sheet cannot move relative to the base, and the second side edge of the curtain sheet can move relative to the base. Such that the horizontal distance between the second side of the screen and the viewer is approximately equal to the horizontal distance between the first side of the screen and the viewer. Therefore, the probability that the screen is inclined (inclined forwards or inclined backwards) after being unfolded by the lifting mechanism can be effectively reduced, the probability that the projection picture projected onto the screen by the projection host is distorted, blurred distortion and other undesirable problems is reduced, and the display effect of the projection picture on the screen is better.

Optionally, please refer to fig. 4, where fig. 4 is a schematic structural diagram of another projection apparatus provided in the embodiment of the present application. The transmission assembly 205 in the projection screen 200 may include: an adjusting rod 2051 and a slider 2052, the slider 2052 being connected to the adjusting rod 2051. The length direction of the adjusting rod 2051 may intersect with the length direction of the winding drum 2041, and the length direction of the adjusting rod 2051 may be perpendicular to the length direction of the winding drum 2041. The slider 2052 of the gearing assembly 205 may be slidably coupled to the base 201 and coupled to the drum 2041, and the adjustment rod 2051 of the gearing assembly 205 may be configured to: the slide 2052 is driven to slide on the base 201 to drive the drum 2041 to move. Thus, after the curtain sheet 202 in the projection screen 200 is unfolded, the adjustment rod 2051 controls the slider 2052 to slide on the base 201, so that the drum 2041 can move along with the curtain sheet 202, and the curtain sheet 202 can rotate around the first side 202a of the curtain sheet 202.

In the embodiment of the present application, there are various optional implementations for the adjusting rod 2051 to drive the slider 2052 to slide on the base 201, and the embodiment of the present application will be schematically described by taking the following two optional implementations as examples:

in a first alternative implementation, referring to fig. 4, the adjusting rod 2051 in the transmission assembly 205 may be a lead screw 2051a, and the slider 2052 may have a threaded hole in threaded connection with the lead screw 2051 a. The length direction of the lead screw 2051a may intersect the length direction of the winding drum 2041, and for example, the length direction of the lead screw 2051a may be perpendicular to the length direction of the winding drum 2041. The lead screw 2051a may be configured to: the screw 2051a rotates around its central axis to move the slider 2052 in the longitudinal direction of the screw 2051a, so that the slider 2052 slides on the base 201. In this way, after the curtain sheet 202 in the projection screen 200 is unfolded, when the lead screw 2051a rotates around the central axis of the lead screw 2051a, the slider 2052 can move in the length direction of the lead screw 2051a, so that the winding drum 2041 also moves along with the lead screw, and the curtain sheet 202 can rotate around the first side 202a of the curtain sheet 202.

Illustratively, the rotation of the screw 2051a about its central axis includes: rotation in a first direction and rotation in a second direction. Wherein the first direction may be one of a clockwise rotation direction and a counterclockwise rotation direction, and the second direction may be the other of the clockwise rotation direction and the counterclockwise rotation direction.

When the lead screw 2051a rotates around its central axis along a first direction, the lead screw 2051a can drive the slider 2052 to move along a designated direction towards an observer, and then the winding drum 2041 can be driven by the slider 2052 to move along the designated direction towards the observer. Since the first side 202a of the curtain sheet 202 does not move relative to the base 201, the second side 202b of the curtain sheet 202 moves relative to the base 201. Therefore, when the second side edge 202b of the curtain sheet 202 follows the roller 2041 to move toward the viewer along the designated direction, the roller 2041 can drive the curtain sheet 202 to rotate clockwise around the first side edge 202a of the curtain sheet 202. Such that the horizontal distance between the second side 202b of the curtain 202 and the viewer is approximately equal to the horizontal distance between the first side 202a of the curtain 202 and the viewer.

When the lead screw 2051a rotates around the central axis thereof along the second direction, the lead screw 2051a can drive the slider 2052 to move away from the observer along the direction, and further the winding drum 2041 can be driven by the slider 2052 to move away from the observer along the direction. Since the first side 202a of the curtain sheet 202 does not move relative to the base 201, the second side 202b of the curtain sheet 202 moves relative to the base 201. Therefore, when the second side edge 202b of the curtain sheet 202 follows the roller 2041 to move away from the viewer in a predetermined direction, the roller 2041 can drive the curtain sheet 202 to rotate counterclockwise around the first side edge 202a of the curtain sheet 202. Such that the horizontal distance between the second side 202b of the curtain 202 and the viewer is approximately equal to the horizontal distance between the first side 202a of the curtain 202 and the viewer.

It should be noted that the directions in which the screw 2051a rotates clockwise and counterclockwise around its central axis to move the slider 2052 depend on the direction of the thread of the screw 2051a and the direction of the thread in the threaded hole in the slider 2052.

In the embodiment of the present application, please refer to fig. 5 and fig. 6, where fig. 5 is a schematic structural diagram of another projection apparatus provided in the embodiment of the present application, and fig. 6 is an exploded view of the projection apparatus shown in fig. 5. The slide 2052 in the drive assembly 205 may include: slider body 2052a and adaptor 2052b, slider body 2052a can with adaptor 2052b fixed connection, the screw hole in slider 2052 can be located adaptor 2052b, and the example, adaptor 2052b can be screw nut. In this application, the slider body 2052a and the adaptor 2052b may be fixedly connected in a screw manner, or may be fixedly connected in other manners, which is not limited in comparison in this application. The slider body 2052a may have a first through hole a1 that communicates with the threaded hole of the adaptor 2052 b. The slider body 2052a can be sleeved on the screw shaft 2051a through the first through hole a1, and the adaptor 2052b can be sleeved on the screw shaft 2051a through a threaded hole. Note that the inner diameter of the first through hole a1 in the slider body 2052a is larger than the inner diameter of the lead screw 2051 a. In this way, the slider body 2052a can be driven by the adaptor 2052b to move along the length direction of the screw 2051 a.

For example, when the curtain sheet 202 is unfolded by the lifting mechanism 203 to incline, the lead screw 2051a may rotate around its central axis (rotate clockwise or rotate counterclockwise), and then the lead screw 2051a can drive the adaptor 2052b to move on the lead screw 2051a, and meanwhile, the adaptor 2052b can drive the slider body 2052a to move on the lead screw 2051a, so that the slider body 2052a drives the winding drum 2041 to move along a specific direction. Since the first side 202a of the curtain sheet 202 does not move relative to the base 201 and the second side 202b of the curtain sheet 202 moves relative to the base 201, the drum 2041 can drive the curtain sheet 202 to rotate around the first side 202a of the curtain sheet 202.

Optionally, the driving assembly 205 in the projection device 000 may further include: a driving motor 2053 and a support 2054, where the support 2054 may be fixedly connected to the base 201, and the driving motor 2053 may be fixedly connected to the support 2054. For example, the driving motor 2053 may be fixedly connected to the support frame 2054 by a screw, or may be fixedly connected by another method, which is not limited in this embodiment of the application. In the present application, the driving motor 2053 may have an output shaft b1, and the output shaft b1 may be connected to an end of the lead screw 2051a, so as to rotate the lead screw 2051a around its central axis when the driving motor 2053 rotates. In the present application, the driving method of the adjustment lever 2051 may be a manual method. For example, an adjusting knob is arranged at one end of the adjusting rod 2051, which is far away from the slider 2052, and the adjusting knob can be manually rotated to drive the adjusting rod 2051 to rotate, so that the adjusting rod 2051 drives the slider 2052 to move.

In the embodiment of the present application, the driving assembly 205 in the projection device 000 may further include: a coupling 2055 and a bearing 2056. The driving motor 2053 and the lead screw 2051a may be disposed on both sides of the support 2054, and the support 2054 may be an L-shaped support, for example. The support 2054 may have a through hole c1, and an output shaft b1 of the driving motor 2053 may pass through the through hole c1 to be connected to one end of a coupling 2055, and the other end of the coupling 2055 is connected to an end of a lead screw 2051 a. A bearing 2056 is sleeved on an end of the lead screw 2051a, and the bearing 2056 may be configured such that the lead screw 2051a is rotatably connected with the base 201 through the bearing 2056. In this way, the coupling 2055 can connect the drive motor 2053 to the lead screw 2051 a.

Referring to fig. 7, fig. 7 is a schematic structural diagram of another projection apparatus provided in an embodiment of the present application. The adjusting rod 2051 in the transmission assembly 205 may be a telescopic rod 2051b, and the transmission assembly 205 may further include: the adjustment member 2057, the adjustment member 2057 may have a receiving cavity 2057 a. A portion of the telescoping rod 2051b can be positioned within the receiving cavity 2057a, and an end of the telescoping rod 2051b that is positioned outside of the receiving cavity 2057a can be fixedly coupled to the slide 2052. Wherein the telescoping rod 2051b can be configured to telescope within the receiving cavity 2057a of the adjustment member 2057 to slide the slider 2052 on the base 201. Thus, after the curtain sheet 202 in the projection screen 200 is unfolded, when the telescopic rod 2051b is controlled by the adjusting member 2057 to extend and retract in the accommodating cavity 2057a, the telescopic rod 2051b can drive the slider 2052 to move, so that the winding drum 2041 also moves along with the slider, and the curtain sheet 202 can rotate around the first side 202a of the curtain sheet 202.

For example, when the extension rod 2051b extends out of the accommodating cavity 2057a, the extension rod 2051b can drive the slider 2052 to move towards the observer along a designated direction, and then the winding drum 2041 can be driven by the slider 2052 to move towards the observer along a designated direction. Since the first side 202a of the curtain sheet 202 does not move relative to the base 201, the second side 202b of the curtain sheet 202 moves relative to the base 201. Therefore, when the second side edge 202b of the curtain sheet 202 follows the roller 2041 to move toward the viewer along the designated direction, the roller 2041 can drive the curtain sheet 202 to rotate clockwise around the first side edge 202a of the curtain sheet 202. Such that the horizontal distance between the second side 202b of the curtain 202 and the viewer is approximately equal to the horizontal distance between the first side 202a of the curtain 202 and the viewer.

When the telescopic rod 2051b is retracted in the accommodating cavity 2057a, the telescopic rod 2051b can drive the slider 2052 to move away from the observer along the appointed direction, and further, the winding drum 2041 can be driven by the slider 2052 to move away from the observer along the appointed direction. Since the first side 202a of the curtain sheet 202 does not move relative to the base 201, the second side 202b of the curtain sheet 202 moves relative to the base 201. Therefore, when the second side edge 202b of the curtain sheet 202 follows the roller 2041 to move away from the viewer in a predetermined direction, the roller 2041 can drive the curtain sheet 202 to rotate counterclockwise around the first side edge 202a of the curtain sheet 202. Such that the horizontal distance between the second side 202b of the curtain 202 and the viewer is approximately equal to the horizontal distance between the first side 202a of the curtain 202 and the viewer.

It should be noted that the device composed of the telescopic rod 2051b and the adjusting member 2057 may be a telescopic electrode, a telescopic pneumatic cylinder, a telescopic hydraulic cylinder, or the like.

Alternatively, referring to fig. 6, one of the base 201 and the slider 2052 in the projection screen 200 may have a bar-shaped protrusion d1, and the other of the base 201 and the slider 2052 may have a bar-shaped groove e1 engaged with the bar-shaped protrusion d1, i.e., the base 201 may have a bar-shaped protrusion d1, and the slider 2052 may have a bar-shaped groove e1 engaged with the bar-shaped protrusion d 1; alternatively, the slider 2052 may have a bar-shaped protrusion d1, and the base 201 may have a bar-shaped groove e1 fitted with the bar-shaped protrusion d 1. It should be noted that the drawings in this application illustrate the base 201 having a strip-shaped protrusion d1, and the slider 2052 having a strip-shaped groove e1 matching with the strip-shaped protrusion d 1. At least part of the bar-shaped protrusion d1 may be located within the bar-shaped groove e 1. In this way, when the slider 2052 moves along the length direction of the adjustment rod 2051, the sliding stability between the slider 2052 and the base 201 is good due to the matching of the strip-shaped protrusion d1 and the strip-shaped groove e 1.

In the present embodiment, the slide block 2052 in the driving assembly 205 may have a second through hole f1, and the end of the reel 2041 in the curling mechanism 204 may be located in the second through hole f1 and rotatably connected with the slide block 2052. In this way, when the rolling mechanism 204 controls the curtain sheet 202 to be retracted, the curtain sheet 202 can be retracted by the rotatable connection of the winding drum 2041 and the second through hole f 1.

Alternatively, projection device 000 may include two driving assemblies 205, and two driving assemblies 205 may be connected to both ends of reel 2041 in curling mechanism 204, respectively. Thus, the transmission assemblies 205 at both ends of the winding drum 2041 can simultaneously drive the winding drum 2041 to move, i.e., drive the curtain sheet 202 to rotate around the first side 202a of the curtain sheet 202. Thus, the probability of the curtain sheet 202 tilting after the curtain sheet 202 is unfolded by the lifting mechanism 203 can be effectively reduced. It should be noted that the projection apparatus 000 may also include a transmission assembly 205, which is not limited in the embodiment of the present application.

In the embodiment of the present application, please refer to fig. 8, and fig. 8 is a schematic structural diagram of a projection apparatus according to another embodiment of the present application. Projection device 000 may also include: and a housing part 300, wherein the housing part 300 is used for housing the projection host 100 and the projection screen 200. The receiving portion 300 may have a light-transmitting area 301 and an opening 302, the light beam emitted from the projection host 100 can pass through the light-transmitting area 301, and the lifting mechanism 203 can control the curtain sheet 202 to pass through the opening 302 and be unfolded. Thus, when the projection apparatus 000 is not used, the projection host 100 and the projection screen 200 are received in the receiving portion 300, which facilitates space saving. When the projection apparatus 000 is in use, the lifting mechanism 203 controls the curtain sheet 202 to be unfolded, and the projection host 100 projects a light beam onto the curtain sheet 202, so that the curtain sheet 202 displays a projection picture.

The vertical distance from the center point of the transparent area 301 to the plane of the developed screen 202 is equal to the product of the projection ratio of the projection host 100 and the width of the display area on the screen 202, 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 projection host 100 can be accurately projected to the display area of the screen 202, so as to ensure the clarity of the projection picture on the screen 202.

Since the throw ratio is a performance parameter of the main projector 100, the throw ratio of the main projector 100 is related to the selected main projector 100, that is, the throw ratio is different when different main projectors are selected, and the vertical distance from the center point of the transparent area 301 to the plane where the developed screen 202 is located is different. In this way, in the actual setting process, the vertical distance from the central point of the light-transmitting area 301 to the plane where the developed curtain sheet 202 is located is calculated according to the projection ratio of the projection host 100 and the width of the display area, so that the light beam emitted by the projection host 100 can be completely projected on the display area of the curtain sheet 202.

Optionally, please refer to fig. 9, where fig. 9 is a schematic view of a lifting mechanism in a projection apparatus according to an embodiment of the present disclosure. The elevating mechanism 203 in the projection device 000 may include: the curtain sheet 202 comprises a cross beam 2031 and a lifting bracket 2032, wherein the lifting bracket 2032 is connected to the cross beam 2031 along one side edge of the cross beam 2031 in the length direction, meanwhile, the other side edge of the cross beam 2031 in the length direction is fixedly connected to a first side edge 202a of the curtain sheet 202, and the lifting bracket 2032 is configured to control the curtain sheet 202 to unfold. The length of the beam 2031 may be equal to the length of the first side 202a of the curtain sheet 202. Thus, the cross beam 2031 can completely limit the curtain sheet 202 along the length direction, and further ensure the flatness of the curtain sheet 202.

For example, the base 201 may be used to be fixedly connected to a support (not shown in the drawings) to fix the projection screen 200. The support body can be a support surface of the fixed support or a wall surface of the wall body. Of course, in other embodiments, the supporting body may be a supporting cabinet or a table top, etc., as long as a fixed support of the projection screen 200 can be achieved.

Alternatively, the projection host 100 may be an ultra-short focus projection host, and the ultra-short focus projection host may be a DLP (Digital Light processing) projection host. In this way, the distance between the projection host 100 and the plane of the projection screen 200 is set to be short, so as to realize a compact design of the entire projection apparatus 000. Projection host 100 may include: a light source, an optical engine and a lens (not shown). The light source is used for emitting light beams to the optical machine.

The light engine may include: the Digital Micromirror Device (DMD) comprises a Digital Micromirror array (DMD) and a driving circuit board electrically connected with the DMD, wherein the driving circuit board in the optical machine is used for providing a driving signal for the DMD. 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 screen 202 in the projection screen 200 through the lens, so that the screen 202 can present a projection picture. As an example, the projection host 100 includes a lens that is an ultra-short focus projection lens.

The screen sheet 202 in the projection screen 200 may be an optical screen sheet, such as a rollable fresnel optical screen, or may also be a flexible black screen, such an optical screen sheet has a higher optical gain compared to a conventional screen, can reduce the brightness and contrast of a light beam as much as possible, and can be suitable for an ultra-short focus projection imaging application by implementing a higher flatness through the control and stretching of the lifting mechanism 203.

The following process of adjusting the tilt of the curtain sheet 202 by using the curling mechanism 204 of the projection screen 200 and the transmission assembly 205 of the first alternative implementation is illustrated when the unfolded curtain sheet 202 is tilted:

when the curtain sheet 202 is inclined after being unfolded by the lifting mechanism 203, firstly, the driving motor 2053 rotates, and the screw shaft 2051a is driven to rotate through the coupling 2055; then, the screw shaft 2051a is in threaded connection with the adaptor 2052b, the screw shaft 2051a can drive the adaptor 2052b to move on the screw shaft 2051a along a specified direction, and meanwhile, the adaptor 2052b can drive the slider body 2052a fixedly connected with the adaptor 2052b to move on the screw shaft 2051a along the specified direction. Since the first side 202a of the curtain sheet 202 is fixedly connected to the cross beam 2031 in the lifting mechanism 203 fixed on the base 201, the second side 202b of the curtain sheet 202 is fixedly connected to the winding drum 2041, and the winding drum 2041 in the winding mechanism 204 is connected to the slider body 2052a in the transmission assembly 205. Therefore, when the driving assembly 205 controls the winding drum 2041 in the winding mechanism 204 to move in a specific direction, the first side 202a of the curtain sheet 202 does not move relative to the base 201, and the second side 202b of the curtain sheet 202 moves relative to the base 201, so that the winding drum 2041 can drive the curtain sheet 202 to rotate around the first side 202a of the curtain sheet 202, and the tilt state of the curtain sheet 202 can be adjusted.

In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The above description is intended to be exemplary only, and not to limit the present application, and any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included therein.

Claims

1. A projection device, comprising:

the projection host is used for emitting a light beam;

2. The projection device of claim 1, wherein the transmission assembly comprises: the adjusting rod and the sliding block are connected with the adjusting rod;

the length direction of the adjusting rod is intersected with the length direction of the winding drum, the sliding block is connected with the base in a sliding mode and is connected with the winding drum, and the adjusting rod is configured to drive the sliding block to slide on the base so as to drive the winding drum to move.

3. The projection device of claim 2, wherein the adjustment rod is a lead screw, the slider has a threaded hole in threaded connection with the lead screw, and the lead screw is configured to rotate around a central axis of the lead screw to move the slider in a length direction of the lead screw, so that the slider slides on the base.

4. The projection device of claim 3, wherein the slider comprises: the sliding block comprises a sliding block body and an adapter fixedly connected with the sliding block body, wherein the threaded hole is formed in the adapter, and the sliding block body is provided with a first through hole communicated with the threaded hole of the adapter;

the slider body is sleeved on the lead screw through the first through hole, and the adapter is sleeved on the lead screw through the threaded hole.

5. The projection device of claim 3, wherein the transmission assembly further comprises: the support frame is fixedly connected with the base, and the driving motor is fixedly connected with the support frame and connected with the end of the lead screw.

6. The projection device of claim 2, wherein the adjustment rod is a telescoping rod, and the transmission assembly further comprises: the adjusting piece is provided with an accommodating cavity, part of the telescopic rod is positioned in the accommodating cavity, and the end part of the telescopic rod, which is positioned outside the accommodating cavity, is fixedly connected with the sliding block;

wherein the telescopic rod is configured to be telescopic in the accommodating cavity so as to drive the sliding block to slide on the base.

7. The projection device of any of claims 2 to 6, wherein one of the base and the slider has a bar-shaped protrusion, and the other of the base and the slider has a bar-shaped groove that mates with the bar-shaped protrusion, at least a portion of the bar-shaped protrusion being located within the bar-shaped groove.

8. The projection device of any of claims 2 to 6, wherein the slider has a second through hole, and an end of the spool is positioned in the second through hole and rotatably connected to the slider.

9. The projection device of any of claims 1 to 6, wherein the projection device comprises two transmission assemblies, and the two transmission assemblies are respectively connected with two ends of the winding drum.

10. The projection device of any of claims 1 to 6, further comprising a receptacle configured to: accommodating the projection screen and the projection host;

the accommodating part is provided with an opening and a light-transmitting area, light beams emitted by the projection host can penetrate through the light-transmitting area to irradiate the curtain sheet, and the lifting mechanism can control the curtain sheet to penetrate through the opening and be unfolded.