Projection device

Abstract

To provide a projection device configured to provide a plurality of projection modes.SOLUTION: A projection device provides a plurality of projection modes. The projection device includes a housing module and a projection module. The housing module includes a display wall and a plurality of protective walls. The display wall includes a display curved surface. The projection module includes an optomechanical assembly and a light guide assembly. In a first projection mode, the optomechanical assembly projects an image light beam to the light guide assembly along a first axis. The light guide assembly projects the image light beam to the display curved surface along a second axis. The first axis and the second axis are not parallel to each other. In a second projection mode, the light guide assembly is moved out of a transmission path of the image light beam, so that the image light beam is directly projected out of the projection device.SELECTED DRAWING: Figure 1D

Description

[Technical Field]

[0001] The present invention relates to optical devices, and more particularly to projection devices. [Background technology]

[0002] Conventional projection technologies use front or rear projection methods to project an image beam onto a projection screen located at a certain distance from the projector, allowing users to view the image information projected on the projection screen. However, these methods require a relatively large installation space. Conventional projector configurations are not well suited for small-scale image display or for creating a partial interior design using a projector. Therefore, technologies for directly projecting and developing images onto external objects have also been developed. For example, a haze sphere is used to project a projection beam onto the external object, and an image is displayed on the sphere using the principle of rear projection. This allows the entire device to be placed in the required space, minimizing the space required, while allowing various images to be displayed on the sphere to attract users' attention.

[0003] However, although the spherical projection method can solve the space problem, it only has the function of spherical projection and lacks the function of projecting onto a large screen like a conventional projector. From the user's perspective, even if a dedicated device is purchased just for the single spherical projection function, it is not used frequently and is not worth the cost. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention provides a projection device that can provide multiple projection modes. [Means for solving the problem]

[0005] One embodiment of the present invention provides a projection device for providing multiple projection modes. The projection device includes a housing module and a projection module. The housing module includes a display wall and a plurality of protective walls, and a storage space is formed by being surrounded by the display wall and the plurality of protective walls. The display wall includes a curved display surface. The projection module is installed in the storage space and includes an optical assembly and a light-guiding assembly, and the light-guiding assembly is movably installed on one of the plurality of protective walls. In a first projection mode, the optical assembly projects an image light beam along a first axis to the light-guiding assembly. The light-guiding assembly projects the image light beam along a second axis to the curved display surface, the first axis and the second axis being non-parallel. In a second projection mode, the light-guiding assembly is moved out of the transmission path of the image light beam, and the image light beam projected by the optical assembly along the first axis is directly emitted from the projection device.

[0006] Therefore, in one embodiment of the present invention, the light guide assembly of the projection device is movably installed on one of the protective walls, so that the projection device can provide multiple projection modes.Compared with the conventional spherical projector, the projection device of this embodiment of the present invention has the advantage of a smaller space usage of the spherical projector, and can provide multiple projection modes, thereby increasing the utilization rate of the projection device. [Brief explanation of the drawings]

[0007] [Figure 1A] 1 is a schematic three-dimensional view of a projection device according to a first embodiment of the present invention; [Figure 1B] 2 is a schematic three-dimensional view of a projection device according to a first embodiment of the present invention from another viewing angle. [Figure 1C] 1 is a schematic cross-sectional view of a projection apparatus according to a first embodiment of the present invention in a first projection mode. [Figure 1D] 3 is a schematic cross-sectional view of the projection apparatus according to the first embodiment of the present invention in a second projection mode. [Figure 2] FIG. 10 is a schematic cross-sectional view of a projection apparatus according to a second embodiment of the present invention in a second projection mode. [Figure 3A] FIG. 10 is a schematic cross-sectional view of a projection apparatus according to a third embodiment of the present invention in a first projection mode. [Figure 3B] FIG. 10 is a schematic cross-sectional view of a projection apparatus according to a third embodiment of the present invention in a second projection mode. [Figure 4] FIG. 10 is a schematic cross-sectional view of a projection apparatus according to a fourth embodiment of the present invention in a third projection mode. [Figure 5A] FIG. 10 is a schematic cross-sectional view of a projection apparatus according to a fifth embodiment of the present invention in a first projection mode. [Figure 5B] FIG. 10 is a schematic cross-sectional view of a projection apparatus according to a fifth embodiment of the present invention in a second projection mode. DETAILED DESCRIPTION OF THE INVENTION

[0008] FIG. 1A is a schematic three-dimensional view of a projection device according to a first embodiment of the present invention. FIG. 1B is a schematic three-dimensional view of the projection device according to the first embodiment of the present invention from another viewing angle. FIG. 1C is a schematic cross-sectional view of the projection device according to the first embodiment of the present invention in a first projection mode. Referring to FIGS. 1A, 1B, and 1C, one embodiment of the present invention provides a projection device 10 for providing multiple projection modes. The projection device 10 includes a housing module 100 and a projection module 200. The housing module 100 includes a display wall 110 and a plurality of protective walls 120, such as protective walls 120A, 120B, 120C, 120D, and 120E. A storage space S is formed between the display wall 110 and the protective walls 120. In this embodiment, the projection device 10 may further include a transparent protective cover attached to the display wall 110, for example, by covering the display wall 110 to protect the display wall 110. The transparent protective cover is made of, for example, a transparent material.

[0009] In this embodiment, the protective wall 120 may be made of plastic, metal, or other suitable material. Protective walls 120A, 120B, and display wall 110 face protective walls 120C, 120D, and 120E, respectively. Display wall 110 is connected to protective walls 120A, 120B, 120C, and 120D, and protective wall 120C is connected to display wall 110, protective walls 120B, 120D, and 120E. In this embodiment, the height HA of protective wall 120A relative to protective wall 120E is smaller than the height HC of protective wall 120C relative to protective wall 120E, and the display wall 110 is inclined relative to protective wall 120E.

[0010] In this embodiment, the display wall 110 has a curved display surface 112, and the curvature of the curved display surface 112 may be positive (e.g., a convex curved surface), negative (e.g., a concave curved surface), zero (e.g., a flat surface), or indefinite (e.g., an ellipsoidal or wavy surface). The curvature and shape of the curved display surface 112 are not particularly limited. The projection module 200 is installed in the storage space S (in the first projection mode) and includes an optical assembly 210 and a light-guiding assembly 220 (in the first and second projection modes, the optical assembly 210 is installed in the storage space S). The optical assembly 210 may include a light source (not shown), an optical modulator (not shown), a projection lens (not shown), and various optical elements in the optical path, such as a collimator, a beam expander, a beam compressor, and a light spot adjuster. The light-guiding assembly 220 is movably installed in one of the plurality of protective walls 120A, 120B, 120C, and 120D. In this embodiment, an opening O is provided in the protective wall 120C, and the light-guiding assembly 220 is installed in the protective wall 120C and can be switched to cover or not cover the opening O.

[0011] Specifically, in the first projection mode of this embodiment, the light-guiding assembly 220 covers the opening O, and the optics assembly 210 projects the image light beam B along a first axis L1 to the light-guiding assembly 220. The light-guiding assembly 220 projects the image light beam B along a second axis L2 to the curved display surface 112, where the first axis L1 and the second axis L2 are not parallel. Note that the first axis in this invention refers to the direction in which the optics assembly emits the image light beam, and the first and second axes are the directions in which the main light beam (or central light beam) of the image light beam propagates.

[0012] 1D is a cross-sectional schematic diagram of the projection device according to the first embodiment of the present invention in the second projection mode. Referring to FIG. 1D , in the second projection mode, the light-guiding assembly 220 is moved out of the transmission path of the image light beam B. That is, the light-guiding assembly 220 does not cover the opening O, and the image light beam B projected by the optics assembly 210 along the first axis L1 passes through the opening O and then directly exits the projection device 10. In this embodiment, the light-guiding assembly 220 is moved out of the transmission path of the image light beam B after rotating, for example, with respect to the protective wall 120C. A portion of the light-guiding assembly 220 is connected to the opening O (protective wall 120C) by mechanical members such as a rotating shaft, fasteners, or retaining rings, and the rotation of these mechanical members moves the light-guiding assembly 220 out of the transmission path of the image light beam B. For example, the light-guiding assembly 220 rotates out of the projection device 10.

[0013] In this embodiment, the first axis L1 and the protection walls 120A, 120B, 120C, 120D, and 120E are not perpendicular to each other, and the second axis L2 and the protection walls 120A, 120B, 120C, 120D, and 120E are not perpendicular to each other.

[0014] In this embodiment, the display surface 112 is a part of a sphere, such as a hemisphere, a 1 / 3 sphere, a 2 / 3 sphere, etc. However, the present invention is not limited thereto, and in another embodiment, the display surface may be a complete sphere.

[0015] In this embodiment, the display wall 110 further includes a top cover 114. The top cover 114 is connected between the display surface 112 and the protective walls 120A, 120B, 120C, and 120D. The top cover 114 is preferably made of an opaque material to shield the components installed in the storage space S. The top cover 114 is made of a highly reflective material, such as a reflector. The highly reflective material (or reflector) is installed on the surface of the top cover 114 away from the storage space S, for example. When the projection device 10 is in the first projection mode, the highly reflective top cover 114 can reflect a portion of the light transmitted through the display surface 112, thereby widening the viewing angle and enhancing the projection effect when the user views the exterior of the projection device 10.

[0016] Furthermore, the angle between the top cover 114 and one of the protective walls 120A, 120B, 120C, and 120D on which the light-guiding assembly 220 is installed (for example, the protective wall 120C in this embodiment) is in the range of 60 degrees to 80 degrees.

[0017] In this embodiment, the light-guiding assembly 220 includes a reflector 222 having a reflective surface 220R, and the reflector 222 can be inserted or removed through an opening O in the protective wall 120C. In this embodiment, the angle between the reflective surface 220R and the top cover 114 is within a range of 50 to 70 degrees. In other words, the reflective surface 220R and the protective wall 120C may be parallel or non-parallel, and the present invention is not particularly limited thereto. In this embodiment, the light-guiding assembly 220 further includes a protective plate 224, and the reflector 222 is installed on the protective plate 224. The light-guiding assembly 220 is installed on the protective wall 120C, for example, via the protective plate 224.

[0018] In this embodiment, the curved display surface 112 is preferably made of a material that is translucent and has a haze, allowing an observer positioned on one side of the curved display surface 112 to see the image light beam B projected by the optics assembly 210 installed on the other side of the curved display surface 112. For example, the curved display surface 112 includes an overlapping transparent substrate and a diffusing layer. The haze of the diffusing layer is in the range of 60% to 80%.

[0019] In one embodiment, the display surface 112 may include a transparent substrate intermixed with a plurality of diffusing particles, the particle diameter of which is in the range of 3 μm to 20 μm.

[0020] In one embodiment, the projection apparatus 10 further includes a control element 300 and a sensor 400 (shown in FIG. 1C ). The control element 300 and the sensor 400 are installed in the storage space S, and the control element 300 is electrically connected to the sensor 400 and the optics assembly 210.

[0021] In one embodiment, the control element 300 may include, for example, a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), a programmable controller, a programmable logic device (PLD), or other similar device, or a combination of these devices, but the present invention is not limited thereto. Also, in one embodiment, each function of the control element 300 may be implemented by multiple source codes. These source codes are stored in a storage unit and executed by the control element 300. Also, in one embodiment, each function of the control element 300 may be implemented by one or more electrical circuits. The present invention is not limited to implementing each function of the control element 300 in a software or hardware manner.

[0022] In one embodiment, the sensor 400 generates an input signal I, and the projection device 10 adjusts the projection parameters of the optical assembly 210 based on the input signal I. The sensor 400 may be, for example, a vibration sensor, a light sensor, or a sound sensor, and the input signal I may be a signal generated by vibration, clapping, sound, touch, etc., and the projection parameters may be, for example, switch on / off, playback mode, playback content, etc. When the control element 300 receives the input signal I from the sensor 400, the control element 300 controls the optical assembly 210 based on the input signal I to adjust the projection parameters of the optical assembly 210.

[0023] In one embodiment, the projection apparatus 10 further includes an operating element 500 (shown in FIG. 1A ). Although the operating element 500 is installed on the protective wall 120A, the present invention is not particularly limited thereto, and the operating element 500 can be installed at any position that is easy for a user to operate. The operating element 500 is, for example, a rotary button. The control element 300 is electrically connected to the operating element 500. Therefore, a user can switch the projection parameters of the optical assembly 210 by using the control element 300.

[0024] According to the above, in one embodiment of the present invention, the projection device 10 includes a display wall 110, protective walls 120A, 120B, 120C, 120D, and 120E, an optical assembly 210, and a light-guiding assembly 220. The light-guiding assembly 220 is movably mounted on one of the protective walls 120A, 120B, 120C, and 120D, so that the projection device 10 can provide multiple projection modes. For example, in a first projection mode (rear projection: spherical projection mode), the light-guiding assembly 220 projects an image beam B onto the curved display surface 112 of the display wall 110. In a second projection mode (direct projection mode), the light-guiding assembly 220 is moved out of the transmission path of the image beam B, and the image beam B is directly emitted from the projection device 10. Compared with conventional spherical projectors, the projection device 10 of one embodiment of the present invention has the advantage that the spherical projector requires a relatively small space, and can provide multiple projection modes, thereby increasing the utilization rate of the projection device 10.

[0025] FIG. 2 is a cross-sectional schematic diagram of a projection device according to a second embodiment of the present invention in a second projection mode. Referring to FIGS. 1C and 2, the only difference between the projection device 10A of FIG. 2 and the projection device 10 of FIG. 1C is the connection method between the light guide assembly and the protective wall 120C. The first projection mode of the projection device 10A is similar to the first projection mode of the projection device 10 of FIG. 1C, and therefore will not be discussed here. The main differences between the second projection mode of the projection device 10A and the second projection mode of the projection device 10 of FIG. 1D are as follows: In this embodiment, the light guide assembly (e.g., the light guide assembly 220 of FIG. 1C) and the protective wall 120C of the projection device 10A are separable. The light guide assembly is temporarily installed in the opening O (first projection mode), for example, by magnetic attraction or a pop-up design. When the projection device 10A is in the second projection mode, the light guide assembly 220 and the protective wall 120C are separated, allowing the light guide assembly 220 to exit the transmission path of the image light beam B. The advantages of the projection apparatus 10A are similar to those of the projection apparatus 10, and therefore will not be described here. In another embodiment, the light-guiding assembly 220 of the projection apparatus 10A can slide relative to the protective wall 120C, for example, the light-guiding assembly 220 can slide along the optics assembly 210 toward / away from the curved display surface 112 by a slide rail, so that the light-guiding assembly 220 is moved out of the transmission path of the image light beam B.

[0026] 3A is a schematic cross-sectional view of a projection apparatus according to a third embodiment of the present invention in a first projection mode. FIG. 3B is a schematic cross-sectional view of a projection apparatus according to a third embodiment of the present invention in a second projection mode. Referring to FIGS. 3A and 3B, the projection apparatus 10B of FIG. 3A is similar to the projection apparatus 10 of FIG. 1C, with the following main differences: In this embodiment, the protective wall 120 further includes an outer wall 122. The outer wall 122 is slidably (e.g., by a slide rail) fitted to the outside of at least one of the protective walls 120A, 120B, 120C, 120D, and 120E. In this embodiment, the outer wall 122 is, for example, installed outside the protective walls 120A, 120C, and 120E (e.g., an opening O is installed in the protective wall 120). The light-guiding assembly 220 is installed on the outer wall 122. By sliding the outer wall 122 relative to the protective walls 120A and 120C, the light-guiding assembly 220 is moved into or out of the transmission path of the image light beam B. When the light-guiding assembly 220 is moved into the transmission path of the image light beam B, as shown in FIG. 3A, the projection device 10B provides a first projection mode. When the light-guiding assembly 220 is moved out of the transmission path of the image light beam B, as shown in FIG. 3B, the projection device 10B provides a second projection mode.

[0027] As described above, the projection device 10B of the embodiment of the present invention is installed in a groove of, for example, a desk or a display stand, and the outer wall 122 is, for example, but not limited to, the inner wall of the groove of the desk or display stand. When the projection device 10B is raised above the desk surface, it can provide direct projection (second projection mode). When the projection device 10B is lowered, it can provide spherical projection (first projection mode). Other advantages of the projection device 10B are similar to those of the projection device 10, so they will not be described here.

[0028] FIG. 4 is a cross-sectional schematic diagram of a projection device according to a fourth embodiment of the present invention in a third projection mode. Referring to FIGS. 1C and 4, the projection device 10C in FIG. 4 is similar to the projection device 10 in FIG. 1C, with the following main differences: In this embodiment, the display wall (e.g., the curved display surface 112 in FIG. 1C) of the projection device 10C is removable or movable, and FIG. 4 shows the projection device 10C after the display wall has been removed or moved. In the third projection mode, the display wall is moved out of the transmission path of the image light beam B, and the optics assembly 210 projects the image light beam B along the first axis L1 to the light-guiding assembly 220. The image light beam B then passes through the light-guiding assembly 220 and exits the projection device 10C directly along the second axis L2. In addition to providing the third projection mode, other advantages of the projection device 10C are similar to those of the projection device 10, and therefore will not be discussed here.

[0029] 5A is a schematic cross-sectional view of a projection device according to a fifth embodiment of the present invention in a first projection mode. FIG. 5B is a schematic cross-sectional view of a projection device according to a fifth embodiment of the present invention in a second projection mode. Referring to FIGS. 5A and 5B, the projection device 10D of FIG. 5A is similar to the projection device 10 of FIG. 1C, but differs mainly as follows: In this embodiment, the top cover 114 of the display wall 110 and one of the protection walls 120A, 120B, 120C, and 120D on which the light-guiding assembly 220 is installed (e.g., protection wall 120C in this embodiment) are perpendicular to each other. Furthermore, the top cover 114 is perpendicular to all of the protection walls 120A, 120B, 120C, and 120D.

[0030] In this embodiment, the included angle between the reflective surface 220R of the light-guiding assembly 220 and the top cover 114 is within a range of 35 to 55 degrees, and the included angle between the reflective surface 220R and one of the protective walls 120A, 120B, 120C, and 120D on which the light-guiding assembly 220 is installed (e.g., protective wall 120C in this embodiment) is within a range of 35 to 55 degrees.

[0031] In this embodiment, one of the protective walls 120A, 120B, 120C, and 120D on which the light-guiding assembly 220 is installed (e.g., protective wall 120C in this embodiment) includes a first planar portion 120C-1 and a second planar portion 120C-2. Specifically, the first planar portion 120C-1 of the protective wall 120C is connected to the top cover 114 and is perpendicular to each other, the first planar portion 120C-1 is connected to the second planar portion 120C-2, and the light-guiding assembly 220 is slidably mounted on the outside of the second planar portion 120C-2. As the light-guiding assembly 220 slides relative to the second planar portion 120C-2, the light-guiding assembly 220 moves in and out of the transmission path of the image light beam B. In the first projection mode, the angle between the reflective surface 220R of the light-guiding assembly 220 and the first flat portion 120C-1 is in the range of 125 to 145 degrees, and the reflective surface 220R is, for example, parallel to the second flat portion 120C-2, as shown in FIG. 5A. In the second projection mode, the angle between the reflective surface 220R of the light-guiding assembly 220 and the first flat portion 120C-1 is in the range of 35 to 55 degrees (for example, the reflective surface 220R is parallel to the second flat portion 120C-2, as shown in FIG. 5B). The second flat portion 120C-2 includes a light-transmitting plate 120C-2T. In the second projection mode, the image light beam B passes through the light-transmitting plate 120C-2T and exits the projection device 10D. The advantages of the projection device 10D are similar to those of the projection device 10, and are therefore omitted here. In this embodiment, the light-guiding assembly 220 has a triangular appearance and is moved by a sliding mechanism, but the present invention is not limited thereto. The light-guiding assembly 220 of the present invention may include a reflector 222 having a reflecting surface 220R, and the appearance of the light-guiding assembly 220 and the mechanism for moving the light-guiding assembly 220 are not particularly limited.

[0032] To sum up, in one embodiment of the present invention, a projection device includes a display wall, a protective wall, an optical assembly, and a light guide assembly, and the light guide assembly is movably installed on one of the protective walls, so that the projection device can provide multiple projection modes.Compared with conventional spherical projectors, the projection device of one embodiment of the present invention has the advantage of requiring less space than spherical projectors, and can provide multiple projection modes, thereby increasing the utilization rate of the projection device.

[0033] The above are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. In other words, all simple and equivalent modifications and alterations based on the claims and the content of the present invention fall within the scope of the present invention. Furthermore, any embodiment or claim of the present invention does not necessarily have all of the objectives, advantages, or features disclosed in the present invention. Furthermore, the abstract and title of the invention are for use in patent document searches and do not limit the scope of the present invention. Furthermore, terms such as "first," "second," etc., used in the specification or claims indicate the names of elements or distinguish between different embodiments or scopes, and do not limit the number of elements. [Explanation of symbols]

[0034] 10, 10A, 10B, 10C, 10D projection device 100 Housing Module 110 display wall 112 Display surface 114 Top lid 120, 120A, 120B, 120C, 120D, 120E: Protection wall 120C-1 1st plane part 120C-2 2nd plane part 120C-2T Translucent flat plate 122 Outside wall 200 Projection Module 210 Optical assembly 220 Light guide assembly 220R reflective surface 222 Reflector 224 Protective plate 300 Control element 400 sensors 500 operating elements B Image light beam HA, HC height I Input signal L1 1st axis L2 2nd axis O opening S Storage space

Claims

1. 1. A projection device, comprising: the projection device provides a plurality of projection modes; the projection device includes a housing module and a projection module; the housing module includes a display wall and a plurality of protective walls, the display wall and the plurality of protective walls are surrounded to form a storage space, the display wall includes a display curved surface, the projection module is installed in the storage space and includes an optical assembly and a light-guiding assembly, the light-guiding assembly being movably installed on one of the plurality of protective walls; In a first projection mode, the optics assembly projects an image beam along a first axis to the light-guiding assembly, and the light-guiding assembly projects the image beam along a second axis to the curved display surface, and the first axis and the second axis are not parallel; In a second projection mode, the light guide assembly is moved out of the transmission path of the image light beam, and the image light beam projected by the optics assembly along the first axis is directly emitted from the projection device.

2. 2. The projection device according to claim 1, wherein the first axis and the plurality of protection walls are not perpendicular, and the second axis and the plurality of protection walls are not perpendicular.

3. 2. The projection device of claim 1, wherein the display surface is a complete sphere or a portion of a sphere.

4. the display wall further includes a top cover; 2. The projection device according to claim 1, wherein the upper cover is connected between the display surface and the plurality of protective walls, and the material of the upper cover includes a material with high reflectivity.

5. 5. The projection device according to claim 4, wherein an included angle between the top cover and one of the plurality of protective walls, on which the light guide assembly is installed, is in the range of 60 degrees to 80 degrees.

6. the light guide assembly further includes a reflector having a reflective surface; 5. The projection device according to claim 4, wherein the angle between the reflecting surface and the top cover is in the range of 50 to 70 degrees.

7. the display surface includes an overlapping transparent substrate and a diffusing layer; 2. The projection device of claim 1, wherein the haze of the diffusing layer is in the range of 60% to 80%.

8. The display surface includes a transparent substrate having a plurality of diffusing particles mixed therein, 2. The projection apparatus of claim 1, wherein the particle diameter of the plurality of diffusing particles is in the range of 3 [mu]m to 20 [mu]m.

9. the display wall is a removable or movable member; 2. The projection device of claim 1, wherein in a third projection mode, the display wall is moved out of the transmission path of the image light beam, the optics assembly projects the image light beam along the first axis to the light guide assembly, and the image light beam further passes through the light guide assembly and exits the projection device directly along the second axis.

10. the plurality of protective walls further include an outer wall; The outer wall is slidably fitted to the outside of at least one of the plurality of protective walls, 2. The projection device according to claim 1, wherein the light-guiding assembly is installed on the outer wall, and the outer wall slides relative to the plurality of protective walls, thereby moving the light-guiding assembly out of or into the transmission path of the image light beam.

11. 2. The projection device according to claim 1, wherein the light-guiding assembly can slide or rotate relative to the protective wall, or the light-guiding assembly can be separated from the protective wall.

12. the projection device further includes a sensor; 2. The projection device of claim 1, wherein the sensor is installed in the storage space, the sensor generates an input signal, and the projection device can adjust projection parameters of the optical assembly based on the input signal.

13. the display wall further includes a top cover; 2. The projection device of claim 1, wherein the top cover is connected between the display surface and the plurality of protective walls, and the top cover and one of the plurality of protective walls on which the light-guiding assembly is installed are perpendicular to each other.

14. the light guide assembly further includes a reflector having a reflective surface; 14. The projection device according to claim 13, wherein the included angle between the reflecting surface and the top cover is in the range of 35 degrees to 55 degrees.

15. One of the plurality of protection walls, on which the light-guiding assembly is installed, includes a first planar portion and a second planar portion, 2. The projection device according to claim 1, wherein the light guide assembly is slidably mounted on the outside of the second planar portion, and the light guide assembly is moved in and out of the transmission path of the image light beam by sliding relative to the second planar portion.

16. 16. The projection device of claim 15, wherein the light-guiding assembly further comprises a reflector having a reflective surface, and an included angle between the reflective surface and the first flat portion is in the range of 35 degrees to 55 degrees.

17. the second flat portion includes a light-transmitting flat plate, 16. The projection device according to claim 15, wherein in the second projection mode, the image light beam passes through the light-transmitting flat plate and is emitted from the projection device.

Images