CN219872102U - projection device - Google Patents

Abstract

The embodiment of the utility model provides a projection device, which comprises a projector and a screen assembly, wherein the projector comprises a shell, a first cover plate and a second cover plate, the shell is provided with an opening, the first cover plate and the second cover plate are rotatably arranged at the opening, the first cover plate and the second cover plate can seal the opening, the first cover plate is provided with a first connecting part, the second cover plate is provided with a second connecting part, the screen assembly comprises a screen, a first scroll and a second scroll, two ends of the screen are connected with the first scroll and the second scroll, the first scroll and the second scroll can drive the screen to relatively wind or unwind, when the screen is unwound, one end of the first scroll can be detachably connected with the first connecting part, and the second scroll can be detachably connected with the second connecting part; when the screen is rolled up, the screen can be accommodated in the shell. The user can use the shell as the support of screen, reduces the required area size of projection arrangement work. And when the screen is rolled, the screen component can be accommodated in the shell, so that the integrated design is realized.

Description

Projection device

Technical Field

The utility model relates to the technical field of projection equipment, in particular to a projection device.

Background

As the user's demand for projection quality increases, the number of components of the projection apparatus increases, resulting in an increase in the volume of the entire apparatus, which poses a challenge to portability of the projection apparatus. The conventional projector is limited in structure, and it is difficult to realize portable installation of the projector and its accessories.

Disclosure of Invention

The embodiment of the utility model provides a projection device to at least partially improve the above technical problems.

The embodiment of the utility model provides a projection device, which comprises a projector and a screen assembly, wherein the projector comprises a shell, a first cover plate and a second cover plate, the shell is provided with an opening, the first cover plate and the second cover plate are rotatably arranged at the opening, the first cover plate and the second cover plate can seal the opening, the first cover plate is provided with a first connecting part, the second cover plate is provided with a second connecting part, the screen assembly comprises a screen, a first scroll and a second scroll, two ends of the screen are connected with the first scroll and the second scroll, the first scroll and the second scroll can drive the screen to relatively wind or unwind, when the screen is unwound, one end of the first scroll can be detachably connected with the first connecting part, and the second scroll can be detachably connected with the second connecting part; when the screen is rolled up, the screen can be accommodated in the shell.

In one embodiment, the screen assembly further comprises a first mounting member and a second mounting member, wherein two ends of the first mounting member are detachably connected with the first cover plate and the first scroll, and two ends of the second mounting member are detachably connected with the second cover plate and the second scroll.

In one embodiment, the first reel and the second reel each comprise a housing, a spindle, a reset member and a rotating shaft, the housing forms a housing cavity, the spindle is arranged in the housing cavity and is connected with the housing, the rotating shaft is rotatably arranged on the spindle, the screen is connected with the rotating shaft, and the reset member is connected with the rotating shaft and is used for providing reset force for the rotating shaft.

In one embodiment, the reset member is a torsion spring, the torsion spring is sleeved outside the mandrel, and two cantilevers of the torsion spring are respectively connected with the rotating shaft and the mandrel.

In one embodiment, the spindle is provided with a first bayonet, the spindle is provided with a second bayonet, and the two cantilevers of the torsion spring are respectively embedded into the first bayonet and the second bayonet.

In one embodiment, the first reel and the second reel each further comprise a ratchet wheel mounted on an outer wall of the shaft and a pawl rotatably mounted on an inner wall of the housing and selectively engaged with or disengaged from the ratchet wheel during rotation.

In one embodiment, the pawl and ratchet are rotatable relative to one another during deployment of the screen.

In one embodiment, an elastic sheet body is arranged on the inner wall of the rotating shaft and abuts against one end of the pawl far away from the ratchet wheel, so that the pawl and the ratchet wheel are kept in an engaged state.

In one embodiment, the screen includes a limiter disposed at 1/2 of the length of the screen.

In one embodiment, a stopper is magnetically coupled to the housing and is positioned at an end of the screen remote from the projector.

According to the projection device provided by the embodiment of the utility model, the first scroll and the second scroll drive the screen to be unfolded, one end of the first scroll can be detachably connected with the first connecting part, and the second scroll can be detachably connected with the second connecting part. The user can use the shell as the support of screen, reduces the required area size of projection arrangement work. In the process of stopping projection work, the first scroll and the second scroll drive the screen to be rolled relatively. And when the screen is rolled, the screen can be accommodated in the shell, the occupied space of the rolled screen is smaller, the screen is more convenient to store, and the integrated design of the projector and the screen assembly is realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a projection apparatus according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram illustrating a structure of another projection apparatus according to an embodiment of the present utility model;

FIG. 3 is a schematic structural view of a first reel according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a ratchet according to an embodiment of the present utility model;

FIG. 5 is a schematic view of another ratchet according to an embodiment of the present utility model;

fig. 6 is a schematic structural view of a sheet according to an embodiment of the present utility model;

fig. 7 is a schematic structural diagram of a screen according to an embodiment of the present utility model.

Detailed Description

In order to make the present utility model better understood by those skilled in the art, the following description of the present utility model will be made in detail with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which a person skilled in the art would obtain without making any inventive effort, are within the scope of the utility model.

In the present utility model, the terms "mounted," "connected," "secured," and the like are to be construed broadly unless otherwise specifically indicated or defined. For example, the connection can be fixed connection, detachable connection or integral connection; can be mechanically or electrically connected; the connection may be direct, indirect, or internal, or may be surface contact only, or may be surface contact via an intermediate medium. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for understanding as a specific or particular structure. The description of the terms "some embodiments," "other embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In the present utility model, the schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples of the present utility model and features of various embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Examples

An embodiment of the present utility model provides a projection apparatus 1, please refer to fig. 1, which includes a projector 10 and a screen assembly 20, wherein the projector 10 may be an LED projector, a laser projector, etc. The light source of projector 10 may be a conventional bulb light source, an LED light source, a laser light source, or the like. The projector 10 in which the LED light source is used is generally simply referred to as an LED projector, and its overall structure is substantially the same as that of a conventional light source. For example, various types of LED light source structures such as an LED lamp (RGB LED) +digital light processing (DLP) for three-primary color intersection imaging and an LED lamp (RGB LED) +liquid crystal on silicon (LCOS) for three-primary color intersection imaging may be employed. The laser projector takes blue laser as a main light source, and light emitted by the blue laser is projected onto the DMD chip through color separation of a color wheel to form an image visible to human eyes. Of course, since the laser is a point light source, the system has a structure such as a diffusion plate and a light pipe, and the laser use is enlarged.

The projector 10 includes a housing 11, a first cover plate 12, and a second cover plate 13, and the projector 10 generates heat during operation. A large amount of heat is accumulated in projector 10, which may affect the normal operation of the internal components. For example, the housing 11 may be made of a metal material having not only low specific heat capacity but also high heat transfer efficiency, high strength, and long service life. The projector 10 can utilize the shell 11 to transfer heat, reduce the heat in the projector 10, and protect the projector 10 from working normally. Preferably, the projector 10 is generally provided with a heat dissipation hole, and the housing 11 can be correspondingly arranged to ensure that heat can be directly discharged out of the projector 10. The housing 11 has an opening 111, the first cover plate 12 and the second cover plate 13 are rotatably disposed at the opening 111, and the first cover plate 12 and the second cover plate 13 can close the opening 111, protecting the projector 10 in the housing 11. External force is prevented from entering the opening 111, thereby damaging the projector 10. In one embodiment, the housing 11 is provided with a receiving cavity near the opening 111, and the receiving cavity may communicate with the outside through the opening 111. And the accommodating cavity can be used for accommodating projection related articles, including but not limited to a projection bracket, a projector controller, a projection screen and the like, so that the projection is integrally accommodated, the space utilization rate of the projection device 1 is improved, and the loss risk of each component is reduced. In another embodiment, the light path of the projector 10 is directed to the opening 111, and in operation of the projector 10, the first cover plate 12 and the second cover plate 13 can open the opening 111, and the light path of the projector 10 exits to the external environment through the opening 111; when the projector 10 stops working, the first cover plate 12 and the second cover plate 13 can close the opening 111 to protect optical elements on the emergent light path of the projector 10 from damage caused by movement or installation.

The screen assembly 20 includes a screen 21, a first spool 22, and a second spool 23. The screen 21 may be classified into a commercial screen, a home screen, and an engineering screen according to the use scenario. Alternatively, according to different projection requirements, the screen 21 may adopt a black grid or fresnel related technology, and the specificity of the black grid structure or fresnel structure may be utilized to improve the quality of the projected image on the screen 21. And the screen 21 may employ a reflective screen for front projection and a transmissive screen for rear projection. In the present embodiment, the material and function of the screen 21 are not limited. The screen 21 is generally sheet-shaped, and the screen 21 occupies a large space in the unfolded state. The screen 21 is made of textile material, which is easily scratched and damaged by foreign objects. To reduce the space occupied by the screen 21 in the idle state, the screen 21 is also protected. The two ends of the screen 21 are connected with a first scroll 22 and a second scroll 23, and the first scroll 22 and the second scroll 23 can drive the screen 21 to be relatively rolled or unrolled. In starting the projection operation, the first reel 22 and the second reel 23 bring the screen 21 to be relatively unfolded, and the unfolded screen 21 has a large projection area. And the first cover plate 12 is provided with a first connection portion 121, the second cover plate 13 is provided with a second connection portion 131, and when the screen 21 is unfolded, one end of the first reel 22 is detachably connected with the first connection portion 121, and the second reel is detachably connected with the second connection portion 131. The user can use the housing 11 as a stand for the screen 21, reducing the amount of floor space required for the operation of the projection device 1. In stopping the projection operation, referring to fig. 2, the first reel 22 and the second reel 23 drive the screen 21 to wind up relatively. And when screen 21 rolling, can accept in shell 11, the occupation space of screen 21 of rolling is littleer, and it is more convenient to accomodate. The integrated design of the screen assembly 20 and the projector 10 can facilitate the storage of users, reduce the storage space and reduce the risk of losing partial products.

In this embodiment, the projector 10 may project a picture onto the screen assembly 20. The screen assembly 20 further includes a first mounting member 24 and a second mounting member 25, wherein both ends of the first mounting member 24 are detachably connected to the first cover plate 12 and the first reel 22, and both ends of the second mounting member 25 are detachably connected to the second cover plate 13 and the second reel 23. The distance between the first cover plate 12 and the first reel 22 may be extended by the first mounting member 24, and the distance between the second cover plate 13 and the second reel 23 may be extended by the second mounting member 25. Further, the distance between the projector 10 and the screen assembly 20 is changed, so that interference of the projector 10 body to the picture on the screen assembly 20 is avoided, and the integrity of the picture is ensured.

In the present embodiment, the storage work of the screen 21 is troublesome, and the operation is time-consuming and laborious. And the difficulty of the storage work of the screen 21 increases due to the limitation of the volumes of the first reel 22 and the second reel 23, which is inconvenient for both hands to operate. Referring to fig. 1 and 3, each of the first reel 22 and the second reel 23 includes a housing 31, a spindle 32, a reset member 33, and a rotating shaft 34. In fig. 3, taking the first reel 22 as an example, the housing 31 forms the accommodating cavity 311, the screen 21 is cylindrical after being rolled up into the accommodating cavity 311, and in order to reduce the volume of the accommodating cavity 311, the accommodating cavity 311 should be correspondingly configured into a cylindrical shape. Further, in order to reduce the volume of the housing 31, the housing 31 should be configured to be cylindrical corresponding to the accommodating cavity 311 for convenience of a user's grip, thereby reducing the volume and increasing portability. The spindle 32 is disposed in the accommodating chamber 311 and is connected to the housing 31. The mandrel 32 can be connected with the shell 31 by adopting threads, so that the threaded connection is convenient to detach and firm in connection. The rotating shaft 34 is rotatably disposed on the mandrel 32, in one embodiment, two ends of the rotating shaft 34 and the mandrel 32 may be connected by a bearing, the rotating shaft 34 is sleeved on an outer wall of the bearing outer ring, and an inner wall of the bearing inner ring is sleeved on an outer wall of the mandrel 32. And to ensure the reliability of the connection between the bearing and the spindle 32 and the spindle 34, both of which are interference fit. The bearing can reduce the friction coefficient when the rotating shaft 34 rotates relative to the spindle 32, and can ensure the rotation precision of the rotating shaft 34. Preferably, the first reel 22 and the second reel 23 may be installed vertically when the projection device 1 performs the projection operation. Therefore, under the influence of gravity, the bearing can bear the action of axial force, and the bearing inner ring and the bearing outer ring are separated. The bearing can adopt an angular contact bearing, the angular contact bearing can bear radial load and axial load simultaneously, the stability of bearing transmission is ensured, and the service lives of the first scroll 22 and the second scroll 23 are prolonged.

The screen 21 is connected with the rotating shaft 34, and the reset piece 33 is connected with the rotating shaft 34 and is used for providing reset force for the rotating shaft 34. In one embodiment, a projection task is required, the user holds the first reel 22 and the second reel 23 with two hands and extends the two ends of the first reel and the second reel respectively, the housing 31 drives the screen 21 to displace, the screen 21 in the unfolding process drives the rotating shaft 34, and the rotating shaft 34 can rotate relative to the mandrel 32. The relative rotation of the spindle 34 and the mandrel 32 generates kinetic energy which is transferred to the restoring member 33 and stored inside the restoring member 33. The driving force of the reset element 33 can continuously stretch the two ends of the screen 21, so that the flatness of the screen 21 is maintained, and the projection effect is improved. When the projection task is finished, the user leaves the first reel 22 and the second reel 23 with both hands, the reset member 33 drives the rotating shaft 34, and the rotating shaft 34 can rotate in the direction opposite to the original rotating direction. The first scroll 22 and the second scroll 23 will automatically wind up the screen 21, and the screen 21 will also drive the first scroll 22 and the second scroll 23 to move in opposite directions until the first scroll 22 and the second scroll 23 abut, and the screen 21 is completely wound up into the first scroll 22 and the second scroll 23. The storage work of the screen 21 is solved, storage time is saved, and projection work efficiency is improved.

Specifically, referring to fig. 3, the restoring member 33 is a torsion spring, the torsion spring is sleeved outside the spindle 32, and two cantilevers of the torsion spring are respectively connected to the rotating shaft 34 and the spindle 32. The relative rotation of the spindle 34 and the spindle 32 generates kinetic energy which is transferred to the two cantilevers of the torsion spring, thereby changing the relative positions of the two ends of the restoring member 33. The torsion spring is deformed and has elastic force inside. At the same time, kinetic energy is converted into potential energy and stored inside the restoring member 33. When the first reel 22 and the second reel 23 are released, the elastic force in the torsion spring drives the rotating shaft 34 to restore to the original position. In one embodiment, under the subsequent frequent unwinding and winding of the screen 21, the inside of the reset member 33 may be deformed or a gap may be generated between the reset member 33 and the rotating shaft 34, resulting in a weakening driving effect of the reset member 33 on the rotating shaft 34, and a situation that the screen 21 cannot be completely wound may occur. Fasteners are provided at both ends of the spindle 32 for fixedly connecting the housing 31 and the spindle 32, and the fasteners can relatively rotate or relatively fix the spindle 32 and the housing 31. In one embodiment, the fastener may be a locking screw, where the two ends of the mandrel 32 are provided with connecting holes, and the connecting holes are provided with internal threads matching with external threads of the locking screw, the user screws the locking screw into the connecting holes, and the end of the locking screw presses the housing 31 onto the mandrel 32, so as to fix the mandrel 32 and the housing 31. And, the user can loosen the fastener, and the mandrel 32 and the shell 31 can rotate relatively. At the same time, the user can fix the screen 21 and the housing 31, and further the positional relationship between the rotation shaft 34 and the housing 31 is relatively fixed. Further changing the positional relationship between the spindle 32 and the rotating shaft 34 can change the relative positions of the two ends of the restoring member 33, thereby maintaining the driving force of the restoring member 33 on the rotating shaft 34. And the preset position of the reset piece 33 can be changed through the setting, so that when the screen 21 is completely rolled up, the reset piece 33 can still drive the rotating shaft 34, and the rotating shaft 34 can roll up the screen 21 more tightly. Preferably, the more the relative rotational displacement of the two ends of the torsion spring is, the larger the elastic force is, and the torsion spring cannot make the rotation shaft 34 perform linear rotation. And the driving force of the torsion spring is generally set too large in order to ensure the screen 21 is completely wound up. The rotational speed of the shaft 34 is too fast under the influence of the torsion spring. When the first reel 22 and the second reel 23 abut, there is a possibility that the two will collide at too high a speed. Thus in one embodiment, the shaft 34 may be configured as a damped shaft, for example, a plurality of shims may be disposed between the shaft 34 and the spindle 32, creating a static friction between the shims that resists some of the driving force of the torsion spring, which may cause the rotation of the shaft 34 to become damped. The collision between the first scroll 22 and the second scroll 23 is avoided when the user winds the operation screen 21, and the risk of injury to the user is reduced. In one embodiment, the spindle 32 is provided with a first bayonet 321, the spindle 34 is provided with a second bayonet 341, and the two cantilevers of the torsion spring are respectively embedded into the first bayonet 321 and the second bayonet 341. The first bayonet 321 and the second bayonet 341 can make the connection between the torsion spring and the mandrel 32 and the rotating shaft 34 more firm. Compared with hard connection, the bayonet connection is more convenient to install and detach and firm in connection.

In this embodiment, in the process of winding the screen 21, the reset element 33 can provide a reset force for the rotating shaft 34, so that the rotating shaft 34 can be reset quickly, and the rotating shaft 34 further drives the screen 21 to wind quickly, so as to realize convenient winding of the screen 21. However, when the user expands the screen 21, the first reel 22 and the second reel 23 are pulled by two hands, and a restoring force is applied, which results in a laborious pulling. Referring to fig. 4, each of the first and second reels 22 and 23 further includes a ratchet 35 and a pawl 36, the ratchet 35 being mounted on an outer wall of the rotation shaft 34, the pawl 36 being rotatably mounted on an inner wall of the housing 31 and selectively engaged with or disengaged from the ratchet 35 during rotation. By virtue of the ratchet 35 and pawl 36 engaging only one way movement, both can limit rotation of the shaft 34 and provide support for the shaft 34. The supporting force can offset the restoring force brought by the restoring piece 33, so that the normal operation of the rotating shaft 34 is ensured, and the service life of the rotating shaft 34 is prolonged.

Specifically, the pawl 36 and the ratchet 35 are rotatable relative to each other during deployment of the screen 21. The screen 21 moves relatively to the first reel 22 and the second reel 23, and the screen 21 can drive the rotating shaft 34 to rotate. With continued reference to fig. 4, the rotation direction of the shaft 34 is indicated by the dashed arrow in fig. 4. The rotating shaft 34 drives the ratchet wheel 35 to move, and the ratchet wheel 35 and the pawl 36 are displaced. In contrast, the pawl 36 is provided with a rotation shaft about which the pawl 36 rotates. The pawl 36 slides on the back of the ratchet 35, and the ratchet 35 is not limited by the pawl 36. When the screen 21 is completely unfolded, the screen 21 cannot move relative to the first reel 22 and the second reel 23, and the rotating shaft 34 cannot rotate continuously in the original rotation direction. At the same time, the restoring member 33 is driven by the rotating shaft 34 and stores a certain kinetic energy. The kinetic energy drives the shaft 34 to rotate in the opposite direction, but the shaft 34 drives the ratchet 35 to rotate in the opposite direction, the pawl 36 is inserted into the teeth of the ratchet 35, and the pawl 36 limits the movement of the ratchet 35. When the user is unwinding the screen 21, the screen 21 can be prevented from being rewound, and the screen 21 cannot be completely unwound. When the screen 21 is wound, referring to fig. 5, the user can operate the ratchet 35 and the pawl 36 to separate, the ratchet 35 is not limited by the pawl 36, and the reset member 33 can drive the rotating shaft 34 to rapidly store the screen 21. Preferably, the user needs the access housing 31 to operate the separation ratchet 35 and the pawl 36 while the screen 21 is wound, but the space between the first and second reels 22 and 23 is limited, and the user's hands are not convenient to access the housing 31. A connector is provided at one end of the pawl 36, which extends out of the housing 31. The user can separate the ratchet wheel 35 from the pawl 36 by pressing the connecting piece, the user does not need to enter the shell 31 with both hands, and the ratchet wheel 35 and the pawl 36 can be operated to separate, so that the device is convenient and quick.

In one embodiment, when the first and second spools 22 and 23 are tilted, vibrated, and dropped, a risk of disengagement between the pawl 36 and the ratchet 35 may occur. After the ratchet 35 and the pawl 36 are disengaged from each other. Regardless of whether the screen 21 is performing projection operation, the reset member 33 can quickly drive the rotating shaft 34 to accommodate the screen 21. Also, accidental rewinding of the first reel 22 and the second reel 23 may cause damage to the screen 21 and the projector 10, etc. Referring to fig. 6, an elastic sheet 37 is disposed on an inner wall of the rotating shaft 34, and the elastic sheet 37 abuts against an end of the pawl 36 away from the ratchet 35, so that the pawl 36 and the ratchet 35 maintain an engaged state. The elastic piece 37 has a certain elastic force, and the elastic force can force the end of the pawl 36 away from the ratchet wheel 35 to move towards the side away from the ratchet wheel 35. The movement of the end of the pawl 36 close to the ratchet 35 towards the side close to the ratchet 35 allows the pawl 36 and the ratchet 35 to engage each other and reduces the risk of disengagement between the pawl 36 and the ratchet 35. Preferably, the elastic force of the elastic sheet 37 has too strong effect on the pawl 36 and the ratchet 35, so that the user can not conveniently operate the screen 21 for winding; the elastic force of the elastic sheet 37 has an excessively weak effect on the pawl 36 and the ratchet 35, and the complete engagement between the pawl 36 and the ratchet 35 cannot be ensured. The effects of the pawl 36 and the ratchet 35 are adjusted. The elastic sheet 37 is relatively stable in the magnitude of elastic force which can be applied by itself due to the influence of the material and the shape. According to the lever principle, the elastic force of the elastic sheet 37 is stable, the distance between the elastic sheet 37 and the rotating shaft is adjusted, the distance from one end of the pawl 36 far away from the elastic sheet 37 to the rotating shaft is unchanged, and the acting force of one end of the pawl 36 far away from the elastic sheet 37 on the ratchet wheel 35 is synchronously changed. The method of adjusting the acting force of the pawl 36 through the elastic sheet 37 is convenient and fast, and the elastic sheet 37 can be reduced in falling risk due to the proper position of the elastic sheet 37, and the force required by the operation of a user can be reduced.

In this embodiment, the volume of the housing 11 is not set too large to satisfy a plurality of projection scenes. The space of the housing 11 for housing the screen 21 is also reduced as much as possible, so that the screen 21 can be housed completely in the housing 11. The screen 21 is provided with a first reel 22 and a second reel 23 at both ends, reducing the volume of the first reel 22 and the second reel 23. Referring to fig. 7, the screen 21 includes a stopper 211, and the stopper 211 is disposed at 1/2 of the length direction (i.e. horizontal direction) of the screen 21. The stopper 211 cannot follow the screen 21 into the first and second reels 22, 23, thereby achieving a situation in which the first and second reels 22, 23 are restrained from being excessively wound. In one embodiment, the limiter 211 may be configured as a sheet, where the sheet faces a side away from the screen 21, and the width of the sheet is greater than the width of the slot for the screen 21 to enter and exit on the housing 31, and the sheet cannot enter the slot, so that the screen 21 is uniformly distributed between the first reel 22 and the second reel 23. The utilization of the inner space of the first reel 22 and the second reel 23 is improved. Preferably, the limiter 211 is disposed on the screen 21, so as to ensure that the limiter 211 does not affect the projection effect and block the projection content. The stopper 211 is located at an end of the screen 21 remote from the projector 10. The restriction of the first reel 22 and the second reel 23 can be realized, and the projection effect can be prevented from being affected. In other embodiments, the limiter 211 may be magnetically coupled to the housing 11, and the housing 11 further includes a magnetic member that is attracted to the limiter 211 to further fix the screen 21 relative to each other to prevent the screen 21 from rattling during use.

The working principle of the projection device 1 provided by the embodiment of the utility model is as follows: the first reel 22 and the second reel drive the screen 21 to be unfolded, one end of the first reel 22 can be detachably connected with the first connecting portion 121, and the second reel can be detachably connected with the second connecting portion 131. The user can use the housing 11 as a stand for the screen 21, reducing the amount of floor space required for the operation of the projection device 1. In stopping the projection operation, the first reel 22 and the second reel 23 drive the screen 21 to be wound up relatively. And when screen 21 rolling, can accept in shell 11, the occupation space of screen 21 of rolling is littleer, and it is more convenient to accomodate, realizes projector 10 and screen assembly 20 integrated design.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting thereof; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and they should be included in the protection scope of the present utility model.

Claims (10)

1. A projection apparatus, comprising:

the projector comprises a shell, a first cover plate and a second cover plate, wherein the shell is provided with an opening, the first cover plate and the second cover plate are rotatably arranged at the opening, the first cover plate and the second cover plate can seal the opening, the first cover plate is provided with a first connecting part, and the second cover plate is provided with a second connecting part; and

the screen assembly comprises a screen, a first scroll and a second scroll, wherein two ends of the screen are connected with the first scroll and the second scroll, the first scroll and the second scroll can drive the screen to be rolled up or unrolled relatively, when the screen is unrolled, one end of the first scroll can be detachably connected with the first connecting part, and the second scroll can be detachably connected with the second connecting part; when the screen is rolled up, the screen can be accommodated in the shell.

2. The projection device of claim 1, wherein the screen assembly further comprises a first mounting member and a second mounting member, wherein the first mounting member has two ends detachably connected to the first cover plate and the first spool, and the second mounting member has two ends detachably connected to the second cover plate and the second spool.

3. The projection device of claim 1, wherein the first reel and the second reel each comprise a housing, a spindle, a reset member, and a rotating shaft, the housing forms a receiving cavity, the spindle is disposed in the receiving cavity and is connected to the housing, the rotating shaft is rotatably disposed on the spindle, the screen is connected to the rotating shaft, and the reset member is connected to the rotating shaft and is used for providing a reset force for the rotating shaft.

4. A projection apparatus according to claim 3 wherein the return member is a torsion spring, the torsion spring is sleeved outside the spindle, and two cantilevers of the torsion spring are respectively connected to the spindle and the spindle.

5. The projection device of claim 4, wherein the spindle is provided with a first bayonet, the spindle is provided with a second bayonet, and the two cantilevers of the torsion spring are respectively embedded into the first bayonet and the second bayonet.

6. The projection device of claim 3, wherein the first and second reels each further comprise a ratchet wheel mounted on an outer wall of the shaft and a pawl rotatably mounted on an inner wall of the housing and selectively engaged with or disengaged from the ratchet wheel during rotation.

7. The projection device of claim 6, wherein the pawl and the ratchet are rotatable relative to each other during deployment of the screen.

8. The projection device of claim 6, wherein an elastic sheet is disposed on an inner wall of the rotating shaft, and the elastic sheet abuts against an end of the pawl away from the ratchet wheel, so that the pawl and the ratchet wheel are kept in an engaged state.

9. The projection device of claim 1, wherein the screen includes a limiter disposed at 1/2 of a length of the screen.

10. The projection device of claim 9, wherein the stop is located at an end of the screen remote from the projector and magnetically coupled to the housing.