Projection device

Abstract

The utility model discloses a projection device which comprises a main body, a fixing frame and a transparent panel used for receiving projection. The main body is a hexahedron formed by folding a single shading plate in a detachable mode, clamping grooves are formed in the left side face and the right side face of the hexahedron in the hexahedron and used for clamping and fixing the transparent panel, or a fixing frame is arranged in the hexahedron and used for fixedly installing the transparent panel, and an observation window is formed in the front face of the hexahedron and used for observing projection imaging on the transparent panel. According to the utility model, the main body is a hexahedron formed by folding a single shading plate in a detachable manner, so that the disassembly and assembly are convenient, and the use portability is improved. The left side face and the right side face of the hexahedron form the clamping grooves in the hexahedron, a user fixes the transparent panel in the clamping grooves in a clamping mode to adapt to single-view-angle projection images, or the transparent panel is installed in the hexahedron through a fixing frame to adapt to four-view-angle projection images, projection images on the transparent panel are observed through the observation window, the structure is simple, and the use is convenient. And the projection requirements of different image sources can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of projection, in particular to a projection device. Background Art

[0002] The pseudo-holographic projection structure usually uses four identical isosceles trapezoidal transparent materials (such as transparent plastic plates) to enclose a pyramid-like structure with openings at both the upper and lower ends. The pyramid-like structure is placed on a projection device such as a smart phone, and a special holographic video is played. Taking the transparent material as the reflection surface, through the reflection of light, the video content will be projected on the four surfaces of the pyramid, forming a pseudo-holographic image, thereby providing an immersive visual experience for the audience.

[0003] Most of the existing pseudo-holographic projection devices are based on the pyramid-like structure, and they are not equipped with fixing components for fixing the pyramid-like structure. In some devices, although there are fixing components, the fixing components are integrally arranged with the pyramid-like structure, which is not conducive to disassembly and storage, and the portability is poor. In addition, most of the existing pseudo-holographic projection devices are only suitable for four-view image projection and are not suitable for single-view image projection. The projection mode is relatively single and cannot meet the projection requirements of different image sources. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a projection device that can meet the projection requirements of different image sources, is convenient to disassemble and assemble, and improves portability.

[0005] To achieve the above object, the solution of the utility model is: a projection device, including a main body, a fixing frame, and a transparent panel for receiving projection; the main body is formed by folding a single light-shielding plate in a detachable manner to form a hexahedron. The left and right two side surfaces of the hexahedron form a clamping groove inside the hexahedron for clamping and fixing the transparent panel, or a fixing frame is provided inside the hexahedron for fixedly installing the transparent panel. An observation window is opened on the front surface of the hexahedron for observing the projection imaging on the transparent panel.

[0006] In a preferred solution, the transparent panel is in a sheet shape. Two clamping surfaces are provided on each of the two side surfaces. The two clamping surfaces are folded and fixed relative to each other on the side surface, and a clamping groove is formed between the two clamping surfaces. The clamping groove is in a long strip shape for clamping and fixing the sheet-shaped transparent panel.

[0007] In a preferred solution, first tongues are respectively provided on the two clamping surfaces, and first clamping grooves matching the first tongues are respectively provided on each side surface. The two clamping surfaces on each side surface are folded relative to each other and the first tongues are inserted into the first clamping grooves, so that the clamping surfaces are fixed on the side surface.

[0008] Preferably, clamping wings are respectively arranged on the two clamping surfaces. After the two clamping surfaces are folded relatively, the two clamping wings are located at the clamping groove, and the two clamping wings extend parallelly towards the middle of the hexahedron.

[0009] Preferably, a plurality of second tongues are respectively arranged on the two side surfaces, and second clamping grooves are respectively arranged on the front, top and back surfaces of the hexahedron at positions matching the second tongues. The two side surfaces are folded relatively along the bottom surface of the hexahedron and are inserted into the second clamping grooves through the second tongues, thereby forming the hexahedron.

[0010] Preferably, the number of the transparent panels is four, each transparent panel is in an isosceles trapezoid shape, the four transparent panels enclose to form a pyramid shape, both ends of the pyramid-shaped transparent panel are open, one end is a narrow end, and the other end is a wide end. The fixing frame is arranged inside the hexahedron, and the pyramid-shaped transparent panel is installed on the fixing frame.

[0011] Preferably, a projection device is further included. The narrow end is arranged downward. The fixing frame is formed by folding three first side plates and one first top plate. One side surface and the bottom surface of the fixing frame are open. The open side surface faces the observation window of the hexahedron. The wide end is installed on the first top plate. The projection device is arranged on the bottom surface of the hexahedron at the narrow end.

[0012] Preferably, a third clamping groove is arranged in the middle of the first top plate, and a third tongue matching the third clamping groove is arranged at the wide end. The wide end is inserted into the third clamping groove through the third tongue, thereby being installed on the first top plate.

[0013] Preferably, a projection device is further included. The wide end is arranged downward. The fixing frame is composed of two vertical frames and one horizontal frame. Each of the two vertical frames is formed by folding three second side plates and one second top plate. The horizontal frame is formed by folding four third side plates and one third top plate. The second side plates of the two vertical frames are respectively fixedly connected with the third side plates on both sides of the horizontal frame, so that the cross section of the fixing frame is in a concave shape. The wide end is installed on the third top plate. The projection device is arranged on the top surface of the hexahedron at the narrow end.

[0014] Preferably, a fourth clamping groove is arranged in the middle of the third top plate, and a fourth tongue matching the fourth clamping groove is arranged at the wide end. The wide end is inserted into the fourth clamping groove through the fourth tongue, thereby being installed on the third top plate.

[0015] After adopting the above solution, the beneficial effects of the present utility model are as follows: The main body of the present utility model is formed by folding a single light-shielding plate in a detachable manner to form a hexahedron, which is convenient for disassembly and assembly and improves the portability of use. The left and right side surfaces of the hexahedron form clamping grooves inside the hexahedron. Users can snap and fix the transparent panel in the clamping grooves to adapt to single-view projection images, or install the transparent panel inside the hexahedron through a fixing bracket to adapt to four-view projection images, and observe the projection imaging on the transparent panel through the observation window. The structure is simple and can meet the projection requirements of different image sources. Description of the Drawings

[0016] Figure 1 is an unfolded schematic diagram of the main body of the first embodiment of the present utility model;

[0017] Figure 2 is a schematic diagram of the sheet-shaped transparent panel of the first embodiment of the present utility model installed inside the main body;

[0018] Figure 3 is a schematic diagram of two clamping surfaces on the side surface of the first embodiment of the present utility model being folded and fixed on the side surface;

[0019] Figure 4 is a top view of the pyramid-shaped transparent panel of the second embodiment of the present utility model;

[0020] Figure 5 is a front view of the pyramid-shaped transparent panel of the second embodiment of the present utility model;

[0021] Figure 6 is a schematic diagram of the pyramid-shaped transparent panel of the second embodiment of the present utility model with the narrow end facing down and installed on the fixing bracket;

[0022] Figure 7 is a front view of the pyramid-shaped transparent panel of the second embodiment of the present utility model with the narrow end facing down and installed on the fixing bracket;

[0023] Figure 8 is a schematic diagram of the pyramid-shaped transparent panel of the third embodiment of the present utility model with the wide end facing down and installed on the fixing bracket;

[0024] Figure 9 is a front view of the pyramid-shaped transparent panel of the third embodiment of the present utility model with the wide end facing down and installed on the fixing bracket.

[0025] Reference Numeral Description:

[0026] 1. Main body; 11. Hexahedron; 12. Front face; 121. Observation window; 13. Side face; 131. Clamping face; 1311. First tongue; 132. Clamping groove; 133. First card slot; 134. Clamping wing; 135. Second tongue; 14. Top face; 141. Projection window; 15. Bottom face; 16. Rear face; 17. Second card slot; 2. Fixed frame; 21. First side plate; 22. First top plate; 221. Third card slot; 23. Standing frame; 231. Second side plate; 232. Second top plate; 24. Cross frame; 241. Third side plate; 242. Third top plate; 2421. Fourth card slot; 3. Transparent panel; 31. Narrow end; 32. Wide end; 321. Third tongue; 322. Fourth tongue; 4. Tooth line; 5. Hidden line; 6. Projection device. Detailed implementation mode

[0027] The present utility model will be further described below in conjunction with the accompanying drawings and specific implementation modes.

[0028] Embodiment 1:

[0029] Embodiment 1 provides a projection device, as Figures 1 to 3 shown, including a main body 1, a fixed frame 2 and a transparent panel 3 for receiving projections; the main body 1 is formed by folding a single piece of light-shielding board in a detachable manner to form a hexahedron 11. The left and right side faces 13 of the hexahedron 11 form a clamping groove 132 inside the hexahedron 11 for clamping and fixing the transparent panel 3, or a fixed frame 2 is provided inside the hexahedron 11 for fixedly installing the transparent panel 3. An observation window 121 is opened on the front face 12 of the hexahedron 11 for observing the projection image on the transparent panel 3.

[0030] As Figures 1 to 3 shown, the left and right side faces 13 of the hexahedron 11 form a clamping groove 132 inside the hexahedron 11. When the user uses a sheet-shaped transparent panel 3, the two ends of the sheet-shaped transparent panel 3 are clamped and fixed in the clamping groove 132, so that the transparent panel 3 can adapt to single-view projection images; when the user uses a pyramid-shaped transparent panel 3, the pyramid-shaped transparent panel 3 is installed inside the hexahedron 11 through the fixed frame 2, so that the transparent panel 3 can adapt to four-view projection images. The structure is simple, providing users with a flexible choice and meeting the projection needs of different image sources.

[0031] The main body 1 of Embodiment 1 is made of a light-shielding board of black or dark color, effectively reducing the interference of external light on the projection effect and ensuring the clarity and color restoration degree of the projection screen. The main body 1 is formed by folding a single piece of light-shielding board in a detachable manner to form a hexahedron 11, which can be quickly installed during use and quickly disassembled after use, making the entire projection device more convenient for storage and transportation and improving the portability of use.

[0032] Further, the transparent panel 3 is in a sheet shape, and two engaging surfaces 131 are provided on each of the two side surfaces 13. The two engaging surfaces 131 are relatively folded and fixed on the side surface 13, and an engaging groove 132 is formed between the two engaging surfaces 131. The engaging groove 132 is in a strip shape for the sheet-shaped transparent panel 3 to be engaged and fixed.

[0033] As Figure 1 shown, in the first embodiment, a sheet-shaped transparent panel 3 is adopted, and the engaging surface 131 is triangular. In a single light-shielding plate formed after the hexahedron 11 is unfolded, the two engaging surfaces 131 are respectively connected to the side surface 13 through right-angle sides. The hypotenuses of the two engaging surfaces 131 on each side surface 13 are parallel to each other. The hypotenuse of one engaging surface 131 is close to the front surface 12 of the hexahedron 11 while the right-angle side is far from the front surface 12 of the hexahedron 11, and the right-angle side of the other engaging surface 131 is close to the back surface 16 of the hexahedron 11 while the hypotenuse is far from the back surface 16 of the right-angle side. After the two engaging surfaces 131 are relatively folded, an engaging groove 132 is formed between the two right-angle sides. The edge of the sheet-shaped transparent panel 3 is engaged in the engaging grooves 132 of the two side surfaces 13. The structure is simple and ingeniously arranged. At the connection between each engaging surface 131 and the side surface 13 in the first embodiment, a tooth line 4 is formed by a tooth cutter, making it easier for the engaging surface 131 to be folded, so that the engaging surface 131 can better fit on the side surface 13 after folding.

[0034] Further, first tongues 1311 are respectively provided on the two engaging surfaces 131, and first grooves 133 matching the first tongues 1311 are respectively provided on each side surface 13. The two engaging surfaces 131 on each side surface 13 are relatively folded and the first tongues 1311 are inserted into the first grooves 133, so that the engaging surfaces 131 are fixed on the side surface 13.

[0035] As Figure 1 shown, in the first embodiment, a first tongue 1311 is provided at the right-angle side of one engaging surface 131 far from the front surface 12 of the hexahedron 11, and all first tongues 1311 are provided at the right-angle side of the other engaging surface 131 close to the back surface 16 of the hexahedron 11. Correspondingly, first grooves 133 are provided on each side surface 13 at positions corresponding to the two first tongues 1311, so that the two engaging surfaces 131 can be relatively folded and attached to the side surface 13 and can be inserted into the first grooves 133 through the first tongues 1311, so that the two engaging surfaces 131 are fixed on the side surface 13. As Figure 1 shown, the first groove 133 in this embodiment adopts a corner setting. Correspondingly, the angle of the first tongue 1311 after folding matches the first groove 133, making the insertion of the first tongue 1311 into the first groove 133 more stable and preventing loosening. Of course, in other embodiments, other connection methods can also be adopted according to actual needs.

[0036] Further, clamping wings 134 are respectively provided on the two clamping surfaces 131. After the two clamping surfaces 131 are folded relative to each other, the two clamping wings 134 are located at the clamping groove 132, and the two clamping wings 134 extend parallelly towards the middle of the hexahedron 11.

[0037] As Figure 1 shown, in the first embodiment, clamping wings 134 are provided on the hypotenuses of each clamping surface 131. The included angle between the clamping wings 134 and the clamping surface 131 is 90 degrees. After the two clamping surfaces 131 are folded relative to each other, the two clamping wings 134 are located at the clamping groove 132, and the two clamping wings 134 extend parallelly towards the middle of the hexahedron 11. When the user adopts the sheet-shaped transparent panel 3, the two ends of the transparent panel 3 are inserted into the clamping grooves 132 on the left and right side surfaces 13 of the hexahedron 11. At this time, the two clamping wings 134 at the clamping groove 132 can ensure that the transparent panel 3 is fixed in the clamping groove 132 and is not easy to slide off. The structure is simple and the design is ingenious.

[0038] Further, a plurality of second tongues 135 are respectively provided on the two side surfaces 13. Second clamping grooves 17 are respectively provided on the front surface 12, the top surface 14 and the back surface 16 of the hexahedron 11 at positions matching the second tongues 135. The two side surfaces 13 are folded relative to the bottom surface 15 of the hexahedron 11 and are inserted into the second clamping grooves 17 through the second tongues 135, thereby forming the hexahedron 11.

[0039] As Figure 1 shown, the side surface 13 of the first embodiment is preferably a square. Correspondingly, the clamping surface 131 is an isosceles right triangle, but not limited thereto. The second tongues 135 are provided on the other three sides of the two side surfaces 13 that are not connected to the bottom surface 15 of the hexahedron 11. Correspondingly, the second clamping grooves 17 are respectively provided on the front surface 12, the top surface 14 and the back surface 16 of the hexahedron 11 at positions matching the second tongues 135, so that after the two side surfaces 13 are folded relative to the bottom surface 15, they are inserted into the second clamping grooves 17 through the second tongues 135, thereby forming the hexahedron 11. The structure is simple and the loading and unloading are convenient.

[0040] Since the first embodiment adopts the sheet-shaped transparent panel 3 and the included angle between the clamping groove 132 and the horizontal plane is 45 degrees, a projection window 141 is provided on the top surface 14 of the hexahedron 11 in the first embodiment. The projection device 6 is arranged at the projection window 141 and projects downward onto the sheet-shaped transparent panel 3, so that the single-view type image can be reflected out of the observation window 121 on the front surface 12 of the hexahedron 11 through the sheet-shaped transparent panel 3 for the user to watch. The structure is simple.

[0041] Further, in the hexahedron 11 of the first embodiment, the connection between the faces forms a dark line 5 through indentation processing, which facilitates the user to fold each face along the dark line 5, and the operation is simple. In addition, a tongue is also provided on the back surface 16 of the hexahedron 11, and correspondingly, a slot is provided on the top surface 14, so that the folded hexahedron 11 can be more stable.

[0042] The usage process of the first embodiment is as follows:

[0043] The user folds a single light-shielding plate along the dark line 5. The two latching surfaces 131 on each of the left and right side surfaces 13 are folded relative to each other, and are inserted into the first slots 133 through the first tongues 1311, so as to fix the latching surfaces 131 on the side surfaces 13. A latching groove 132 is formed between the two latching surfaces 131. The clamping wings 134 on the latching surfaces 131 are folded to an angle perpendicular to the latching surfaces 131, and the clamping wings 134 on each side surface 13 are located at the latching groove 132.

[0044] Then, the two side surfaces 13 are folded relative to each other along the bottom surface 15 and are inserted into the second slots 17 on the front surface 12, the top surface 14 and the back surface 16 through the second tongues 135, so as to form the hexahedron 11.

[0045] Finally, the sheet-shaped transparent panel 3 is clamped and fixed on the latching grooves 132 on the left and right side surfaces 13 of the hexahedron 11. The two clamping wings 134 are assisted to clamp on the sheet-shaped transparent panel 3. The projection device 6 is arranged at the projection window 141 on the top surface 14 of the hexahedron 11 and projects downward onto the sheet-shaped transparent panel 3, so that the single-view type image can be reflected out of the observation window 121 on the front surface 12 of the hexahedron 11 through the sheet-shaped transparent panel 3 for the user to view.

[0046] Second embodiment:

[0047] The difference between the second embodiment and the first embodiment is that, as Figures 4 to 7 shown, the number of the transparent panels 3 is four. Each transparent panel 3 is an isosceles trapezoid. The four transparent panels 3 enclose to form a pyramid shape. The two ends of the pyramid-shaped transparent panel 3 are open. One end is a narrow end 31 and the other end is a wide end 32. The fixing frame 2 is arranged inside the hexahedron 11, and the pyramid-shaped transparent panel 3 is installed on the fixing frame 2.

[0048] The second embodiment adopts a pyramid-shaped transparent panel 3, and all four transparent panels 3 are isosceles trapezoids. The angle between each face of the pyramid-shaped transparent panel 3 and the horizontal plane is 45 degrees, which is beneficial to improving the imaging effect and can meet the projection requirements of four-view type images.

[0049] The pyramid-shaped transparent panel 3 of the second embodiment is installed inside the hexahedron 11 through the fixing frame 2. The fixing frame 2 is simply arranged, which improves the flexibility of use.

[0050] Further, it further includes a projection device 6. The narrow end 31 is arranged downward. The fixing frame 2 is formed by folding three first side plates 21 and a first top plate 22. One side surface 13 and the bottom surface 15 of the fixing frame 2 are open. The open side surface 13 faces the observation window 121 of the hexahedron 11. The wide end 32 is installed on the first top plate 22. The projection device 6 is arranged on the bottom surface 15 of the hexahedron 11 and is located at the narrow end 31.

[0051] As Figure 6 and Figure 7 shown, in the second embodiment, the narrow end 31 of the pyramid-shaped transparent panel 3 is arranged downward. The fixing frame 2 is formed by one-piece die-cutting of a single plate to form three first side plates 21 and a first top plate 22. The fixing frame 2 can be formed only by folding the first side plates 21 and the first top plate 22, which is convenient to use. The wide end 32 is installed on the first top plate 22. Correspondingly, the projection device 6 is installed at the bottom of the hexahedron 11, so that the center of the four-view image source is located at the narrow end 31. The height of the first side plate 21 in the second embodiment should match the sum of the height of the projection device 6 and the height of the pyramid-shaped transparent panel 3 to achieve the best use effect.

[0052] Since the second embodiment uses the fixing frame 2 to install the pyramid-shaped transparent panel 3, there is no need to set a projection window 141 on the top surface 14 of the hexahedron 11, which can further reduce the interference of external ambient light, enhance the suspension feeling of the projection image, and improve the viewing experience.

[0053] Further, as Figure 6 and Figure 7 shown, a third card slot 221 is provided in the middle of the first top plate 22 in the second embodiment. The wide end 32 is provided with a third tongue 321 that matches the third card slot 221. The wide end 32 is inserted into the third card slot 221 through the third tongue 321 and thus installed on the first top plate 22. The structure is simple and the loading and unloading are convenient.

[0054] The use process of the second embodiment is as follows:

[0055] The user folds a single light-shielding plate along the dark line 5. The two latching surfaces 131 on each side surface 13 of the left and right side surfaces 13 are folded relatively, and are inserted into the first card slot 133 through the first tongue 1311, so as to fix the latching surfaces 131 on the side surface 13. A latching groove 132 is formed between the two latching surfaces 131. The clamping wings 134 on the latching surfaces 131 are folded to an angle perpendicular to the latching surfaces 131. The clamping wings 134 on each side surface 13 are located at the latching groove 132.

[0056] Then, the two side faces 13 are folded relative to each other along the bottom face 15 and are inserted into the second card slots 17 on the front face 12, the top face 14, and the back face 16 through the second tongue 135, thereby forming a hexahedron 11.

[0057] Finally, the three first side plates 21 and one first top plate 22 are folded to form a fixing frame 2 and placed inside the hexahedron 11. The wide end 32 of the pyramid-shaped transparent panel 3 is inserted into the third card slot 221 through the third tongue 321, thereby being mounted on the first top plate 22. The projection device 6 is mounted at the bottom of the hexahedron 11 such that the center of the four-view image source is located at the narrow end 31. The four-view image can be reflected out of the observation window 121 on the front face 12 of the hexahedron 11 through the pyramid-shaped transparent panel 3 for the user to view.

[0058] Embodiment Three:

[0059] The difference between Embodiment Three and Embodiment Two is that, as Figure 8 and Figure 9 shown, it further includes a projection device 6. The wide end 32 of Embodiment Three is arranged downward. The fixing frame 2 is composed of two vertical frames 23 and one horizontal frame 24. Both of the two vertical frames 23 are formed by folding three second side plates 231 and one second top plate 232, and the horizontal frame 24 is formed by folding four third side plates 241 and one third top plate 242. The vertical frame 23 and the horizontal frame 24 can be formed by folding, and the operation is simple. The second side plates 231 of the two vertical frames 23 are respectively fixedly connected to the third side plates 241 on both sides of the horizontal frame 24. The connection can be made by means of adhesive bonding, but it is not limited thereto, such that the cross-section of the fixing frame 2 is in the shape of a "concave". When disassembling, only the two vertical frames 23 need to be folded relative to the horizontal frame 24 to be flattened and stacked, which is beneficial for storage. The wide end 32 is mounted on the third top plate 242. Correspondingly, the projection device 6 is arranged on the top face 14 of the hexahedron 11 or can also be mounted between the two vertical frames 23 such that the center of the four-view image source is located at the narrow end 31. The heights of the two vertical frames 23 in Embodiment Three should match the sum of the height of the pyramid-shaped transparent panel 3 and the height of the horizontal frame 24 to achieve the best use effect.

[0060] Furthermore, as Figure 8 and Figure 9 shown, a fourth card slot 2421 is provided in the middle of the third top plate 242 of Embodiment Three, and the wide end 32 is provided with a fourth tongue 322 that matches the fourth card slot 2421. The wide end 32 is inserted into the fourth card slot 2421 through the fourth tongue 322, thereby being mounted on the third top plate 242. The structure is simple and the loading and unloading are convenient.

[0061] The usage process of Embodiment Three is as follows.

[0062] The user folds a single light-shielding plate along the dark line 5. The two latching surfaces 131 on each side surface 13 of the left and right side surfaces are folded relative to each other, and are inserted into the first card slot 133 through the first tongue 1311, so as to fix the latching surface 131 on the side surface 13. A latching groove 132 is formed between the two latching surfaces 131. The clamping wings 134 on the latching surface 131 are folded to an angle perpendicular to the latching surface 131, and the clamping wings 134 on each side surface 13 are located at the latching groove 132.

[0063] Then, the two side surfaces 13 are folded relative to each other along the bottom surface 15 and are inserted into the second card slots 17 on the front surface 12, the top surface 14 and the back surface 16 through the second tongues 135, so as to form a hexahedron 11.

[0064] Finally, the two vertical frames 23 and the horizontal frame 24 are cooperatively folded to form a fixing frame 2 and are placed inside the hexahedron 11. The wide-mouth end 32 of the pyramid-shaped transparent panel 3 is inserted into the fourth card slot 2421 through the fourth tongue 322, so as to be installed on the third top plate 242. The projection device 6 is installed on the top of the hexahedron 11, or can also be erected between the two vertical frames 23, so that the center of the four-view type image source is located at the narrow-mouth end 31. The four-view type image can be reflected out of the observation window 121 on the front surface 12 of the hexahedron 11 through the pyramid-shaped transparent panel 3 for the user to view.

[0065] The orientation terms mentioned in this specification are defined relative to the structures shown in the respective drawings. They are relative concepts, and thus may change accordingly depending on their different positions and different usage states. Therefore, these or other orientation terms should not be construed as restrictive terms.

[0066] The above description is only a preferred embodiment of the present utility model and does not limit the design of this case. All equivalent changes made according to the key design of this case fall within the protection scope of this case.

Claims

1. A projection device, characterized in that: It includes a main body, a fixing frame, and a transparent panel for receiving a projection; The main body is formed by folding a single-piece light-shielding plate in a detachable manner into a hexahedron. Clamping grooves are formed inside the hexahedron on the left and right sides of the hexahedron for the transparent panel to be clamped and fixed, or a fixing frame is provided inside the hexahedron for the transparent panel to be fixedly installed. An observation window is opened on the front of the hexahedron for observing the projection image on the transparent panel.

2. The projection device according to claim 1, wherein: The transparent panel is in a sheet shape. Two clamping surfaces are provided on each of the two sides. The two clamping surfaces are folded and fixed relatively on the side. A clamping groove is formed between the two clamping surfaces. The clamping groove is in a strip shape for the sheet-shaped transparent panel to be clamped and fixed.

3. A projection device according to claim 2, characterized in that: First tongues are respectively provided on the two clamping surfaces. First clamping grooves matching the first tongues are respectively provided on each side. The two clamping surfaces on each side are folded relatively and are inserted on the first clamping grooves through the first tongues, so that the clamping surfaces are fixed on the side.

4. A projection device according to claim 2, wherein: Clip wings are respectively provided on the two clamping surfaces. After the two clamping surfaces are folded relatively, the two clip wings are located at the clamping groove. The two clip wings extend parallelly towards the middle of the hexahedron.

5. The projection device according to claim 2, wherein: A number of second tongues are respectively provided on the two sides. Second clamping grooves are respectively provided on the front, top, and back of the hexahedron at positions matching the second tongues. The two sides are folded relatively along the bottom surface of the hexahedron and are inserted on the second clamping grooves through the second tongues, so as to form the hexahedron.

6. The projection device according to claim 1, characterized in that: The number of the transparent panels is four. Each transparent panel is in an isosceles trapezoid shape. The four transparent panels enclose to form a pyramid shape. The two ends of the pyramid-shaped transparent panel are open. One end is a narrow end, and the other end is a wide end. The fixing frame is provided inside the hexahedron, and the pyramid-shaped transparent panel is installed on the fixing frame.

7. The projection device according to claim 6, wherein: It also includes a projection device. The narrow end is arranged downward. The fixing frame is formed by folding three first side plates and one first top plate. One side and the bottom surface of the fixing frame are open. The open side faces the observation window of the hexahedron. The wide end is installed on the first top plate. The projection device is arranged on the bottom surface of the hexahedron at the narrow end.

8. A projection device according to claim 7, characterized in that: A third clamping groove is provided in the middle of the first top plate. A third tongue matching the third clamping groove is provided at the wide end. The wide end is inserted on the third clamping groove through the third tongue, so as to be installed on the first top plate.

9. The projection device according to claim 6, characterized in that: It also includes a projection device. The wide end is arranged downward. The fixing frame is composed of two standing frames and one cross frame. Each of the two standing frames is formed by folding three second side plates and one second top plate. The cross frame is formed by folding four third side plates and one third top plate. The second side plates of the two standing frames are respectively fixedly connected to the third side plates on both sides of the cross frame, so that the cross section of the fixing frame is in a "concave" shape. The wide end is installed on the third top plate. The projection device is arranged on the top surface of the hexahedron at the narrow end.

10. A projection device according to claim 9, characterized in that: A fourth clamping groove is provided in the middle of the third top plate. A fourth tongue matching the fourth clamping groove is provided at the wide end. The wide end is inserted on the fourth clamping groove through the fourth tongue, so as to be installed on the third top plate.

Images