A projection device

Abstract

This utility model discloses a first projection module and a second projection module installed on a lamp holder. The first projection module includes at least a first light source and a corrugated sheet, with light emitted from the first light source passing through the corrugated sheet and projected outwards; or the first projection module includes a first light source and at least one optical element, with light emitted from the first light source being refracted or reflected by the optical element before being projected outwards. The central axis of the projection angle of the first projection module is defined as P1. The second projection module is movably connected to the lamp holder and includes a second light source, a projection screen, and an imaging lens. The second projection module forms lyric projection, pattern projection, or animation projection. The central axis of the projection angle of the second projection module is defined as P2. When either the first or second projection module rotates, the angle θ between the central axes P1 and P2 changes. Users can adjust the relationship between the projection positions of the first or second projection modules according to their needs.

Description

[Technical Field]

[0001] This utility model relates to the technical field of projection devices, and in particular to a projection device that changes the projection angle between projection modules. [Background Technology]

[0002] An existing projection device includes a first projection component and a second projection component arranged side-by-side, both with the same projection direction and parallel to each other. The first projection component includes a first light module, a projection disk, and an imaging lens. The first projection module forms a rotating projection pattern and projects it into space. The second projection module includes a second light module and an optical corrugated sheet located above the second light module. Light emitted from the light source component is guided by the second light module, passes through the second light module, forms a corrugated pattern, and is projected into space; wherein the projection direction of the corrugated pattern and the dynamic image in space remains fixed.

[0003] Because the projection directions of the first and second projection components of an existing projection device are fixed, the projection position relationship between the two projection components cannot be changed, thus failing to meet the usage requirements.

[0004] Therefore, a new projection device needs to be designed to overcome the above problems. [Utility Model Content]

[0005] In view of the problems faced by the prior art, this utility model provides a projection device that changes the projection angle between the first projection module and the second projection module.

[0006] To achieve the above objectives, the present invention employs the following technical means:

[0007] A projection device includes: a lamp holder, a first projection module and a second projection module mounted on the lamp holder; the first projection module includes at least a first light source and a corrugated sheet located above the first light source, the surface of the corrugated sheet having uneven textures, and light emitted by the first light source is projected outward by passing through at least the corrugated sheet; or the first projection module includes the first light source and at least one optical element, the optical element being selected from one of the following: a projection sheet, a projection mask, a grating sheet, or a multi-faceted reflector, and light emitted by the first light source is projected outward by being refracted or reflected by at least the optical element, the central axis of the projection angle of the first projection module being defined as P1; the second projection module is movably connected to the lamp holder and includes at least a second light source, a projection screen, and an imaging lens, the second projection module forming a projection element that projects outward, the projection element being selected from at least one of the following: lyric projection, pattern projection, or animation projection, the central axis of the projection angle of the second projection module being defined as P2; when the first projection module or the second projection module rotates, the angle θ between the central axis P1 and the central axis P2 changes.

[0008] Furthermore, when the second projection module rotates in a direction away from the first projection module, the included angle θ increases; or when the second projection module rotates in a direction closer to the first projection module, the included angle θ decreases.

[0009] Furthermore, the second projection module can be rotated upwards by 0° to 60°, or downwards by 0° to 30°, or to the left by 0° to 30°, or to the right by 0° to 30°.

[0010] Furthermore, with the horizontal plane as a reference, the second projection module is rotated upwards by 0° to 60° or downwards by 0° to 30°.

[0011] Furthermore, the included angle θ is ±90°.

[0012] Furthermore, the included angle θ ranges from 30° to 120°.

[0013] Furthermore, the first projection module projects towards the ceiling, and the second projection module projects towards the wall. Through the projection light effect of the first projection module, one can see the text, pattern, or animation formed by the second projection module, or the projection light effect of the first projection module can be set around the projection light effect of the second projection module.

[0014] Furthermore, the first projection module includes a strong light area and a soft light area surrounding the strong light area, and the projection effect of the second projection module overlaps with the soft light area.

[0015] Furthermore, as the lyrics, text, or patterns projected by the second projection module change, the first projection module automatically or manually projects red light effects, blue light effects, green light effects, or any combination of the three color light effects, or a light effect rhythm effect, or changes the projected pattern.

[0016] Furthermore, when a song is at a high pitch, the rotation speed of the first projection module gradually increases or a rhythmic light effect is displayed; when a song progresses to a low pitch, the rotation speed of the first projection module gradually decreases or remains constant.

[0017] Compared with the prior art, the projection device of this utility model has the following advantages:

[0018] The first projection module, mounted on a lamp holder, comprises at least a first light source and a corrugated sheet. Light emitted from the first light source passes through the corrugated sheet and is projected outwards. Alternatively, the first projection module comprises a first light source and at least one optical element, selected from the following: a projection sheet, a projection mask, a grating, or a multi-faceted reflector. Light emitted from the first light source is refracted or reflected by the optical element and projected outwards. The central axis of the projection angle of the first projection module is defined as P1. The second projection module is movably connected to the lamp holder and comprises a second light source, a projection screen, and an imaging lens. The second projection module projects lyrics, patterns, or animations. The central axis of the projection angle of the second projection module is defined as P2. When either the first or second projection module rotates, the angle θ between the central axes P1 and P2 changes. Users can adjust the projection position relationship between the first and second projection modules according to their needs, facilitating flexible product use. [Attached Image Description]

[0019] Figure 1 This is a perspective view of the projection device of this utility model;

[0020] Figure 2 for Figure 1 3D exploded view;

[0021] Figure 3 for Figure 2 A 3D view of the second projection module in the middle;

[0022] Figure 4 for Figure 3 Top view;

[0023] Figure 5 for Figure 4 A sectional view taken along line AA;

[0024] Figure 6 for Figure 3 3D exploded view;

[0025] Figure 7 for Figure 6 An exploded three-dimensional view of the second light source and the concentrator.

[0026] Explanation of reference numerals in the accompanying drawings for specific embodiments:

[0027] Projection device 100 Lamp holder 1 Containment cavity 11 Guide groove 112 Projection hole 113 First projection module 2 First Light Source 21 Optical element 22 Driver Component 23 Optical devices 24 Second projection module 3 Casing 31 Containment space 311 Pivot 312 Positioning pin 313 Positioning hole 314 315 Buckle part 316 317 Press Block Damping component 318 Second light source 32 Concentrator 33 Lower opening 331 Top opening 332 First reflector 333 Second reflector 334 Reflective surface 335 Limit block 336 Leaving slot 337 Chamfered curved surface 338 Positioning shell 339 Reflector 340 Projection screen 34 Imaging lens 35 Positioning ring 351 Lens Group 352

Detailed Implementation Methods

[0028] To facilitate a better understanding of the purpose, structure, features, and effects of this utility model, the present utility model will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0029] like Figures 1 to 7 As shown, the projection device 100 of this utility model includes a lamp holder 1, a first projection module 2 and a second projection module 3 mounted on the lamp holder 1. The central axis of the first projection module 2 and the central axis of the second projection module 3 form an angle θ, 0°≤θ≤180°, preferably 0° to 120°.

[0030] like Figure 1 and Figure 2 As shown, the lamp holder 1 includes a receiving cavity 1 and a guide groove 112 and a projection hole 113 that are connected to the receiving cavity 1.

[0031] like Figure 1 , Figure 2As shown, the central axis of the first projection module 2 is defined as P1, or the central axis of the projection angle of the first projection module 1 is defined as P1. The projection effect formed by the first projection module 2 includes a strong light area and a soft light area surrounding the strong light area. The first projection module 2 is housed in the receiving cavity 11. The first projection module 2 includes a first light source 21 and at least one optical element 22 located above the first light source 21. The optical element 22 is configured as at least one of the following: a projection sheet, an interference sheet, a projection mask, a corrugated sheet, a grating sheet, a diffuse reflector, a convex lens, or a beam splitter. The first light source 21 is at least one LED or laser, selected from monochromatic or multicolor, multi-sheet, standard or special LEDs or lasers. The first projection module 2 also includes a driving component 23, which drives the first light source 21 and / or the optical element 22 to rotate. The first light source 21 or the optical element 22 is configured to rotate at a constant speed or a variable speed or in the forward direction and / or in the reverse direction. The light emitted by the first light source 21 is projected outward after being refracted or refracted by the optical element 22 at least once. In this embodiment, the first projection module 2 further includes an optical device 24 located above the optical element 22. The optical device 24 is configured as at least one of the following: an aurora cover with an irregularly shaped elongated lens, a condenser cover with multiple facets, or a condenser lens. The projection light effect of the first projection module 2 is projected at least partially toward the ceiling, wall, or bottom surface, wherein the projection light effect includes at least one of the following: aurora borealis, galaxy, constellation, water ripples, sky, clouds, starry sky, moon, luminous pattern, sign, or commercial advertisement. The first projection module 2 forms a gradient light effect, with the intensity of the projection optics gradually weakening from the center to the outer edge. The projection light effect formed by the first projection module 2 is projected onto the ceiling, wall, or bottom surface.

[0032] like Figure 5 , Figure 6 and Figure 7As shown, the central axis of the second projection module 3 is defined as P2, or the central axis of the projection angle of the second projection module 3 is defined as P2. An angle θ is formed between P1 and P2, where 30° ≤ θ ≤ 120°. That is, the central axis of the projection angle of the first projection module 2 intersects the central axis of the projection angle of the second projection module 3, and the angle θ between P1 and P2 ranges from 50° to 105°. The projection directions of the first projection module 2 and the second projection module 3 are different. The second projection module 3 is movably connected to the lamp holder 1 and, with the lamp holder 1 as a base point, swings up and down and / or left and right along the guide groove 112. When the first projection module 2 or the second projection module 3 rotates, the angle θ between the central axis P1 and the central axis P2 will increase or decrease. In an embodiment, when the second projection module 3 moves upward, the angle θ decreases, or when the second projection module 3 moves downward, the angle θ increases. The second projection module 3 rotates upwards from 0° to 60° or downwards from 0° to 30°. In other embodiments, with the horizontal plane as a reference, the second projection module 3 rotates upwards from 0° to 60° or downwards from 0° to 30°, preferably with the included angle θ being ±90°. The second projection module 3 projects one of the following light effects: lyrics projection, pattern projection, or animation projection. The overlap position with the light effect of the first projection module 2 changes, or the lyrics, font, or pattern projection formed by the second projection module 3 overlaps with different forms of light effects formed by the first projection module 2. The connection structure between the second projection module 3 and the lamp holder 1 is configured as a pin connection, magnetic connection, clamp connection, ball joint connection, magnetic connection, damping hinge connection, hinge connection, gear connection, universal joint connection, or connecting rod connection. The horizontal direction is defined as the starting point for the swing of the second projection module 3. The second projection module 3 rotates upward and / or downward by 0° to 90° and / or to the left and / or to the right by 0° to 90°, and is set to fixed focus, manual focus, or automatic focus. The lamp holder 1 is defined as a base, or the housing of the first projection module 2 is defined as a base, or an additional connector fixedly connected to the lamp holder 1 can also be defined as a base. The second projection module 3 includes at least a second light source 32, a projection screen 34, and an imaging lens 35 arranged sequentially. In this embodiment, the second projection module 3 includes a housing 31, a second light source 32 mounted on the housing 31, a condenser 33, a projection screen 34, and an imaging lens 35. The second light source 32, the condenser 33, the projection screen 34, and the imaging lens 35 are arranged sequentially from bottom to top. The focal length of the imaging lens 35 is defined as F, and the distance between the projection screen 34 and the imaging lens 35 is between 1F and 2F.The second projection module 3 includes a housing 31 and a receiving space 311 formed in the housing 31. The housing 31 includes a first shell and a second shell that interlock with each other. The first shell is provided with a positioning pin 313 and a hook 315, and the second shell is provided with a positioning hole 314 and a latching part 316. The positioning pin 313 cooperates with the positioning hole 314, and the hook 315 is fastened to the latching part 316. Alternatively, the first shell 31 and the second shell 31 are fixed by the hook 315 and / or the positioning pin 313 or screws. The first shell or the second shell also includes an outwardly extending pivot portion 312 and a damping member 318. The damping member 318 enhances the friction between the pivot portion 312 and the lamp holder 1. The pivot portion 312 and the damping member 318 together cooperate with the hole in the lamp holder 1 to form a pin-shaft connection structure. The second projection module 3 includes only the second light source 32, the condenser 33, the projection screen 34, and the imaging lens 35. The second light source 32 dissipates heat through an aluminum substrate and / or heat dissipation holes; or the second projection module 3 includes only the second light source 32, the condenser 33, a heat-insulating and light-transmitting plate, the projection screen 34, and the imaging lens 35. The second light source 32 dissipates heat through an aluminum reflector and / or heat dissipation holes. The heat dissipation substrate is housed in the housing 31 and attached to the second light source 32. The condenser 33 includes a lower opening 331 and an upper opening 332 that are interconnected. The upper opening 332 is larger than the lower opening 331, and the lower opening 331 is arranged around the second light source 32. The condenser 33 includes at least one reflector constituting the upper opening 332 and the lower opening 331. The inner surface of the reflector forms a reflective surface 335, which is composed of a reflective film or a reflective sheet. Alternatively, the concentrator 33 may include a positioning housing 339 and a reflector 340 mounted on the positioning housing 339, with a plurality of the reflectors arranged toward the lamp body (see). Figure 7The positioning shell 339 and the reflector 340 are formed independently or integrally; when integrally formed, the reflective film is formed. In this embodiment, the concentrator 33 includes two first reflectors 333 and two second reflectors 334 that constitute the upper opening 332 and the lower opening 331 and are arranged opposite to each other. The square projection screen is adapted to the upper opening. The surfaces of the first reflectors 333 and the second reflectors 334 are provided with reflective films or reflective sheets, forming the reflective surface 335. The reflective surface 335 is an arc-shaped surface with a gradually changing curvature. The arc-shaped surface extends obliquely from bottom to top, that is, the reflectors gradually move away from the central axis of the concentrator 33 from bottom to top. The inclination of the arcuate surface of the second reflector 334 is greater than or equal to the inclination of the arcuate surface of the first reflector 333, or the angle formed by the tangent of the arcuate surface of the first reflector 333 and the central axis of the condenser 33 is greater than the angle formed by the tangent of the arcuate surface of the second reflector 334 and the central axis of the condenser 33. The arcuate surfaces of the first reflector 335 and the second reflector 335 are connected by a chamfered arcuate surface 338. The angle formed by the tangent of the arcuate surface of the first reflector 333 and / or the second reflector 335 and the central axis of the condenser gradually decreases. At least part of the light beam emitted by the second light source 32 passes through the projection screen 34 and the imaging lens 35 after its optical path is changed by the reflective film, the reflector sheet, or the reflector cover 340. The luminous area of ​​the second light source 32 is greater than or equal to the projection area of ​​the projection screen 34. The focusing element also includes multiple limiting blocks 336 and clearance grooves 337 arranged around the opening. The multiple limiting blocks 336 restrict the projection screen 34 from shifting horizontally, and the pressing block 317 of the housing 31 restricts the projection screen 34 from moving upward; or the projection screen 34 is fixed to the focusing element or the housing 31 by adhesive. The limiting groove 337 is located on one side of the limiting block 336, facilitating the electrical connection between the conductive wire and the projection screen 34. The imaging lens assembly 36 includes a positioning ring 351 and a lens assembly 352. The internal thread of the positioning ring 351 engages with the external thread of the lens assembly 352 for focusing the imaging lens 35. Alternatively, the positioning ring 351 and the lens assembly 352 engage through a guide groove and a sliding post to achieve focusing. The positioning ring 351 is fixedly connected to the housing 31.

[0033] like Figure 5As shown, the length of the projection screen 34 is defined as L, the distance between the projection screen 34 and the lamp body is defined as D, and the included angle α between the two first reflectors 333 is greater than or equal to the included angle β between the two first reflectors 333. In the existing structure, the closer the second light source 32 is to the projection screen 34, the higher the light utilization rate and the worse the illumination uniformity X. However, after adding the condenser 33 between the first light source 21 and the projection screen 34, the following data was obtained through multiple research and development experiments: as the second light source 32 gets closer to the projection screen 34, the illumination uniformity gradually becomes more uniform. In addition, because the larger the included angle α is, the higher the lamp body lumen value and the higher the light utilization rate, but the more heat the second light source 31 generates, it is easy to cause the temperature to exceed the temperature that the projection screen 34 can withstand, causing the projection screen 34 to turn blue or its non-projection area to have higher light transmittance, thus affecting the projection effect. Therefore, it is necessary to determine the range of values ​​for the included angle α through multiple research and development experiments. According to the test data, an illumination uniformity X less than 3 is considered uniform, and the closer it is to 1, the more uniform it is. When α = 20°, the light utilization rate is 25%–35%, the illumination uniformity X = 1.05–1.35, and D = 2L–3L; when α = 30°, the light utilization rate is 35%–44%, the illumination uniformity X = 3.5–4.5, and D = 1.2L–2L; when α = 40°, the light utilization rate is 45%–53%, the illumination uniformity X = 3.2–4.3, and D = 1L–1.5L; when α = 50°, the light utilization rate is 54%–60%, the illumination uniformity X = 2.6–4, and D = 0.8L–1L; when α = 60°, the light utilization rate is 61%–71%, the illumination uniformity X = 1.5–3, and D = 0.6L–0.8L; when α = 70°, the light utilization rate is… The light utilization rate is 66%–73%, the light uniformity X = 1.4–2.8, and D = 0.5L–0.65L; when α = 80°, the light utilization rate is 70%–77%, the light uniformity X = 1.2–1.6, and D = 0.43L–0.5L; when α = 90°, the light utilization rate is 80%–88%, the light uniformity X = 1.04–1.3, and D = 0.35L–0.43L; when α = 100°, the light utilization rate is 83%–94%, the light uniformity X = 1.1–1.5, and D = 0.29L–0.35L; when α = 110°, the light utilization rate is 88%–96%, the light uniformity X = 2–3, and D = 0.23L–0.3L. When the included angle α between the two first reflectors 333 is between 30° and 100°, the light utilization rate is 35% to 94%, X = 1.04 to 4.5, and D = 0.27L to 2L. When the included angle α between the two oppositely arranged first reflectors is between 40° and 90°, the relationship between L and D satisfies D = 0.35L to 1.5L, the light flux utilization rate of the focusing element is 45% to 88%, and the illumination uniformity X = 1.04 to 4.3.When the included angle α between the two first reflectors 333 is between 40° and 100°, the relationship between L and D satisfies D = 0.27L to 1.5L, the luminous flux utilization rate of the focusing element is 40% to 94%, and the illumination uniformity X = 1.1 to 4.3. When the included angle α between the two first reflectors 333 is between 50° and 90°, the relationship between L and D satisfies D = 0.35L to 1L, the luminous flux utilization rate of the focusing element is 54% to 88%, and the illumination uniformity X = 1.04 to 4. The projection light effect of the first projection module 2 constitutes the atmospheric effect of the second projection module 3. The second projection module 3 at least forms lyrics, fonts, or pattern projections, i.e., constitutes projection elements. The projection screen 34 is a black and white screen that projects lyrics onto a wall, floor, film cloth, or tabletop. When the projection screen 34 receives the lyrics information transmitted from the motherboard, it lights up the corresponding liquid crystal to form the lyrics projection. As the lyrics projection of the second projection module 3 changes, the first projection module 2 automatically or manually projects red, blue, green, or any combination of these three colors, or a rhythmic light effect, or a changing projection pattern. A speaker installed in the lamp holder 1 receives the audio file transmitted from the motherboard and plays the sound. When a song is at a high pitch, the rotation speed of the first projection component 2 gradually increases or a rhythmic light effect is displayed; when a song progresses to a low pitch, the rotation speed of the first projection module 2 gradually decreases or remains constant. The lyrics projected by the second projection module 3 fall on a wall, screen, or bottom surface. The projection light effect of the first projection module 2 surrounds the lyrics, or the lyrics can be observed through the light effect formed by the first projection module 2. When the projection device 100 is connected to a microphone, karaoke can be performed. The first projection module 2 includes a central strong light effect and a weak light effect surrounding the strong light effect. The lyrics, fonts, or pattern projection can be observed through the central optics and / or outer edge optics of the first projection module 2. In this embodiment, when the first projection module 2 projects upwards and the second projection module 3 projects towards the wall, the lyrics, patterns, or dynamic effects projected by the second projection module 3 can be seen through the weak light effect formed by the first projection module 2, i.e., the outer edge light effect; or the first projection module 2 projects horizontally, and the strong or weak light effect of the second projection module 3 is arranged around the light effect of the second projection module 3. In this embodiment, the lyrics, subtitles, patterns, or animations projected by the second projection module 3 fall on the soft light area of ​​the first projection module 2, or the projection light effect of the first projection module 2 is arranged around the lyrics, or the light effect formed by the second projection module 3 can be seen through the light effect of the first projection module 2.

[0034] In summary, the projection device of this utility model has the following beneficial effects:

[0035] (1) A first projection module 2 and a second projection module 3 are installed on a lamp holder 1. The first projection module 2 includes at least a first light source 21 and a corrugated sheet. The light emitted by the first light source 21 is projected outward by passing through the corrugated sheet at least once. Alternatively, the first projection module 2 includes a first light source 21 and at least one optical element 22. The optical element 22 is selected from one of the following: a projection sheet, a projection mask, a grating sheet, or a multi-faceted reflector. The light emitted by the first light source 21 is projected outward by being refracted or reflected by the optical element 22 at least once. The projection angle of the first projection module 21 is defined. The central axis of the first projection module 2 is P1; the second projection module 3 is movably connected to the lamp holder 1 and includes a second light source 32, a projection screen 34 and an imaging lens 35. The second projection module 3 forms a lyric projection, a pattern projection or an animation projection. The central axis of the projection angle of the second projection module 3 is defined as P2. When the first projection module 2 or the second projection module 3 rotates, the angle θ between the central axis P1 and the central axis P2 changes. Users can adjust the relationship between the projection positions of the first projection module 2 or the second projection module 3 according to their needs, making it convenient and flexible to use the product.

[0036] (2) The second projection module 3 is rotated upward from 0° to 60° or downward from 0° to 30°. If the angle of the second projection module 3 tilting upward or downward is too large, it will easily cause the projected fonts and patterns to be elongated and deformed or the atmosphere to be too weak.

[0037] (3) The first projection module 2 includes a strong light area and a soft light area surrounding the strong light area. The projection effect of the second projection module 3 overlaps with the soft light area. If the second projection module 3 projects onto the strong light area, it will be difficult for the user to see the light effect of the second projection module 3, affecting the use effect.

[0038] (4) The first projection module 2 projects towards the ceiling, and the second projection module 3 projects towards the wall. Through the projection light effect of the first projection module 2, you can see the text, pattern or animation formed by the second projection module 3. Or the projection light effect of the first projection module 2 is set around the projection light effect of the second projection module 3. The first projection module 2 forms the background atmosphere light effect of the second projection module 3. The user can observe the projection light effect of the first projection module 2 in the horizontal direction.

[0039] The above detailed description is only a description of the preferred embodiment of this utility model and is not intended to limit the patent scope of this utility model. Therefore, all equivalent technical changes made using the content of this invention's specification and illustrations are included within the patent scope of this invention.

Claims

1. A projection device, characterized in that, include: A lamp holder, and a first projection module and a second projection module mounted on the lamp holder; A first projection module includes at least a first light source and a corrugated sheet located above the first light source. The surface of the corrugated sheet is provided with uneven textures. Light emitted from the first light source passes through the corrugated sheet and is projected outward. Alternatively, the first projection module includes the first light source and at least one optical element. The optical element is selected from one of the following: a projection sheet, a projection mask, a grating sheet, or a multi-faceted reflector. Light emitted from the first light source is projected outward after being refracted or reflected by the optical element. The central axis of the projection angle of the first projection module is defined as P1. The second projection module is movably connected to the lamp holder and includes at least a second light source, a projection screen, and an imaging lens. The second projection module forms a projection element that projects outward. The projection element is selected from at least one of the following: lyrics projection, pattern projection, or animation projection. The central axis of the projection angle of the second projection module is defined as P2. When the first projection module or the second projection module rotates, the angle θ between the central axis P1 and the central axis P2 changes.

2. The projection device as described in claim 1, characterized in that: When the second projection module rotates away from the first projection module, the included angle θ increases; or when the second projection module rotates towards the first projection module, the included angle θ decreases.

3. The projection device as described in claim 2, characterized in that: The second projection module can be rotated upwards by 0° to 60°, or downwards by 0° to 30°, or to the left by 0° to 30°, or to the right by 0° to 30°.

4. The projection device as described in claim 2, characterized in that: With the horizontal plane as a reference, the second projection module rotates upward from 0° to 60° or downward from 0° to 30°.

5. The projection device as described in claim 4, characterized in that: The included angle θ is ±90°.

6. The projection device as described in any one of claims 1-5, characterized in that: The included angle θ ranges from 30° to 120°.

7. The projection device as described in any one of claims 1-5, characterized in that: The first projection module projects towards the ceiling, and the second projection module projects towards the wall. Through the projection light effect of the first projection module, one can see the text, pattern, or animation formed by the second projection module, or the projection light effect of the first projection module can be set around the projection light effect of the second projection module.

8. The projection device as described in claim 7, characterized in that: The first projection module includes a strong light area and a soft light area surrounding the strong light area, and the projection effect of the second projection module overlaps with the soft light area.

9. The projection device as described in any one of claims 1-5, characterized in that: As the lyrics, text, or patterns projected by the second projection module change, the first projection module automatically or manually projects red, blue, or green light effects, or any combination of the three colors, or a light effect rhythm, or changes the projected pattern.

10. The projection device as described in any one of claims 1-5, characterized in that: When a song is in a high note, the rotation speed of the first projection module gradually increases or a rhythmic light effect is displayed. When a song progresses to a low note, the rotation speed of the first projection module gradually decreases or remains constant.

Images