Projection device

Abstract

The application provides a projection device, and relates to the technical field of projection imaging. The projection device comprises a light-emitting module, a light folding and turning component, a first driving device and a beam splitter. The light-emitting module is used for emitting light. The light folding and turning component is located on the light path of the light source light. The light folding and turning component is used for folding and turning the light source light to form folded and turned light. The first driving device is connected to the light folding and turning component to change the propagation angle of the folded and turned light. The beam splitter is located on the light path of the folded and turned light. The beam splitter is provided with a plurality of light diffusion parts. The folded and turned light forms a plurality of beams of outgoing light after being affected by the plurality of light diffusion parts. Through the projection device, the movement state of the light folding and turning component can be adjusted to form a dynamic projection effect, and the user's viewing experience is enriched.

Description

Technical Field

[0001] This application relates to the field of projection imaging technology, and in particular to a projection device. Background Technology

[0002] Projection devices are commonly used indoors, utilizing optical principles to create a lighting or image environment that helps users receive image information more clearly and enhances their viewing experience. Existing projection devices typically use optical deflectors to redirect light rays, causing them to be projected off-center from the light source. However, these deflectors usually deflect light in a fixed direction, meaning the projection device can only create one or a few light spots on the projection surface, resulting in a relatively limited projection effect. Utility Model Content

[0003] In view of this, embodiments of this application provide a projection device to solve the above-mentioned technical problems.

[0004] This application provides a projection device, which includes a light-emitting module, a light-refracting component, a first driving device, and a beam splitter. The light-emitting module emits light from a light source. The light-refracting component is located in the optical path of the light source and refracts the light source to form refracted light rays. The first driving device is connected to the light-refracting component to change the propagation angle of the refracted light rays. The beam splitter is located in the optical path of the refracted light rays and has multiple light-diffusing sections. After passing through the multiple light-diffusing sections, the refracted light rays form multiple outgoing beams.

[0005] In some embodiments, there are two optical refracting elements, including a first optical refracting element and a second optical refracting element. A first driving device is connected to at least one of the first and second optical refracting elements. The first optical refracting element is located in the optical path of the light source, and the second optical refracting element is located in the optical path formed by the first optical refracting element. The propagation direction of the refracted light emitted from the second optical refracting element is opposite to the propagation direction of the light source.

[0006] In some embodiments, the first optical refracting element has a first optical axis, the second optical refracting element has a second optical axis, and there are two first driving devices. One first driving device is connected to the first optical refracting element and has a first rotation axis, which is parallel to or coincides with the first optical axis. The other first driving device is connected to the second optical refracting element and has a second rotation axis, which is parallel to or coincides with the second optical axis.

[0007] In some embodiments, the optical refracting element has an optical axis, and includes a connecting portion and a plurality of reflecting portions. The plurality of reflecting portions are respectively connected to the connecting portion, and the optical axis passes through at least a portion of the structure of the plurality of reflecting portions. The plurality of reflecting portions are used to reflect light from the light source to form multiple beams of refracted light.

[0008] In some embodiments, multiple reflective elements are arranged around the optical axis; or, multiple reflective elements are connected in sequence, with a connecting angle between two adjacent reflective elements.

[0009] In some embodiments, the reflective part is a plane mirror, and the angle between the multiple plane mirrors and the optical axis is the same.

[0010] In some embodiments, multiple reflective portions are arranged facing the surface of the light-emitting module to form a reflective surface of the light-refracting element. The reflective surface has a central region and an edge region surrounding the central region. The optical axis passes through the central region, and the central region is recessed relative to the edge region.

[0011] In some embodiments, the projection device further includes a second driving device connected to a beam splitter. The beam splitter has a third optical axis, and the second driving device has a third rotation axis that is parallel to or coincides with the third optical axis.

[0012] In some embodiments, the projection device further includes a condenser lens disposed between the optical refracting element and the beam splitter, and the condenser lens has a fourth optical axis that intersects with the third optical axis.

[0013] In some embodiments, multiple light-diffusing portions are arranged side by side toward the surface of the light-refracting element to form the light-diffusing surface of the beam splitter. The light-diffusing surface is curved and is either concave relative to the light-refracting element or protrudes toward the light-refracting element.

[0014] In some embodiments, the light-emitting module includes a bracket, a light source, and a beam shaping component. The bracket has a mounting groove, the light source assembly is disposed within the mounting groove, and the beam shaping component covers the mounting groove. The beam shaping component has a light-transmitting hole, through which light generated by the light source propagates to the outside of the mounting groove, forming light from the light source. The light-transmitting hole defines the beam shape of the light from the light source.

[0015] Compared to existing technologies, this embodiment provides a projection device including a light-emitting module, a light-refracting component, a first driving device, and a beam splitter. The first driving device is connected to the light-refracting component to drive its rotation, causing the refracted light rays to propagate along a dynamic path to the beam splitter. This increases the randomness of the refracted light ray distribution at the beam splitter; that is, when the light-refracting component rotates, the same refracted light ray can propagate to different positions on the beam splitter and exit due to different angles, thus creating various projection effects. Furthermore, during the rotation of the light-refracting component, the same refracted light ray will switch back and forth between at least two positions on the beam splitter, forming a dynamic projection effect similar to twinkling stars, thereby improving the user experience. Furthermore, the beam splitter is equipped with multiple light diffusion sections. On the one hand, these multiple light diffusion sections enable the light to be distributed more evenly in each emission direction, thereby avoiding the problem of local overbrightness or underbrightness of the projected image caused by light concentration and improving the uniformity of the projection device. On the other hand, the multiple light diffusion sections enable a beam of refracted light to be diffused into multiple beams of emitted light to form multiple projection spots. The superposition of multiple projection spots forms a projection pattern, which can improve the imaging effect of the projection pattern and further enhance the user's visual experience. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the projection device provided in the embodiments of this application.

[0018] Figure 2 yes Figure 1 The diagram shows a schematic representation of the projection device in one embodiment.

[0019] Figure 3 yes Figure 1 The diagram shows a structural schematic of the projection device in another embodiment.

[0020] Figure 4 yes Figure 1 A schematic diagram of the structure of the light deflector in the projection device shown in one embodiment.

[0021] Figure 5 yes Figure 1 A schematic diagram of the structure of the light deflector in the projection device shown in one embodiment.

[0022] Figure 6 yes Figure 1 The diagram shows a structural schematic of the projection device in another embodiment.

[0023] Reference numerals: 100, projection device; 10, light-emitting module; 1001, housing; 1002, bottom wall; 1003, side wall; 1004, storage space; 1005, light outlet; 11, light source; 12, beam shaping component; 13, light-transmitting hole; 14, bracket; 141, mounting groove; 20, light refracting component; 21, connecting part; 211, connecting groove; 22, reflecting part; 23, reflecting surface; 231, middle... 232. Core region, 24. Edge region, 25. First optical refracting element, 26. Second optical refracting element, 30. First driving device, 40. Beam splitter, 41. Light diffusion section, 411. Light diffusion surface, 42. Connector, 421. Mounting section, 43. Body section, 50. Second driving device, 60. Condensing lens, O, Optical axis, O1. First optical axis, O2. Second optical axis, O3. Third optical axis, O4. Fourth optical axis. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] It should be noted that when a component / part is said to be "fixed to" another component / part, it can be directly on the other component / part or there may be an intermediate component / part. When a component / part is considered to be "connected to" another component / part, it can be directly connected to the other component / part or there may be an intermediate component / part present; also, when a component / part is considered to be "connected to" another component / part, it can be integrally formed or assembled with the other component / part. When a component / part is considered to be "set on" another component / part, it can be directly set on the other component / part or there may be an intermediate component / part present.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] Please see Figures 1 to 2This application provides a projection device 100, which includes a light-emitting module 10, a light-refractive element 20, a first driving device 30, and a beam splitter 40. The light-emitting module 10 can form a light source with a specific beam shape. The light source beam is refracted by the light-refractive element 20 to propagate to the beam splitter 40 and form multiple outgoing beams. Finally, a star-like projection effect is formed on the projection receiving surface, thereby improving the user's viewing experience. The projection receiving surface is a plane used to receive and display the projected pattern, which may include reflective parts such as the ground, walls, and ceiling. Depending on the shape of the beam, the projection image formed by the projection device 100 is different. For example, the projection device 100 can be a star projection lamp, which is used to form a star image. For another example, the projection device 100 can be a pattern projection lamp. By setting a light source beam with a specific shape, different patterns or text can be formed on the projection receiving surface to meet the user's needs. This embodiment does not specifically limit the type of image projected by the projection device 100. For ease of explanation, the shape of the light source beam in this embodiment is a star, and the projection device 100 can be a star projection lamp.

[0028] In one embodiment provided in this application, the projection device 100 includes a light-emitting module 10, a light-reflecting element 20, a first driving device 30, and a beam splitter 40. The light-emitting module 10 is used to emit light from a light source. The light-reflecting element 20 is located in the optical path of the light source and is used to refract the light source to form refracted light. The first driving device 30 is connected to the light-reflecting element 20 to change the propagation angle of the refracted light. The beam splitter 40 is located in the optical path of the refracted light and has multiple light-diffusing parts 41. After the refracted light passes through the multiple light-diffusing parts 41, it forms multiple beams of outgoing light.

[0029] By setting the first driving device 30 to drive the light refracting element 20 to rotate, the refracted light rays propagate to the beam splitter 40 along a dynamic path. This increases the randomness of the distribution of the refracted light rays at the beam splitter 40. That is, when the light refracting element 20 rotates, the same refracted light ray can propagate to different positions on the beam splitter 40 and exit due to different angles, thus forming a variety of projection effects. In addition, during the rotation of the light refracting element 20, the same refracted light ray will switch back and forth between at least two positions on the beam splitter 40, which can form a dynamic projection effect similar to twinkling stars, thereby improving the user experience. Furthermore, the beam splitter 40 is provided with multiple light diffusion sections 41. On the one hand, the multiple light diffusion sections 41 can make the light more evenly distributed in each emission direction, thereby avoiding the problem of local overbrightness or underbrightness of the projected image caused by light concentration, and improving the uniformity of the projection device 100. On the other hand, the multiple light diffusion sections 41 can make a beam of refracted light diffuse into multiple beams of emitted light to form multiple projection light spots. The multiple projection light spots are superimposed to form a projection pattern, which can improve the imaging effect of the projection pattern and further enhance the user's visual experience.

[0030] The following sections will introduce each component of the projection device 100 and its specific structure.

[0031] Please see Figure 1 The projection device 100 may include a housing 1001. The housing 1001 has a bottom wall 1002 and a side wall 1003. The side wall 1003 surrounds and forms a storage space 1004. The storage space 1004 is used to accommodate the light-emitting module 10, the light refracting element 20, the first driving device 30, the beam splitter 40 or other components, thereby providing protection and storage for the projection device 100. In some embodiments, the housing 1001 is provided with a light outlet 1005 or a light-transmitting part (not shown in the figure). The light outlet 1005 or the light-transmitting part is used to allow emitted light to be emitted from the housing 1001. There are multiple light outlets 1005 or light-transmitting parts. The multiple light outlets 1005 or light-transmitting parts can be arranged around the circumference of the housing 1001 or the volume of the light outlets 1005 or light-transmitting parts can be large. So that when the first driving device 30 drives the light deflector 20 to rotate to different positions, the deflected light can be emitted from the light outlet 1005 or the light-transmitting part to the projection receiving surface, so as to ensure the normal use of the projection device 100. As a specific example, the housing 1001 is provided with multiple light outlets 1005, each light outlet 1005 connecting the storage space 1004 to the outside. The light outlets 1005 can be set on the side wall 1003 and are positioned opposite to the beam splitter 40. The light emitted by the projection device 100 can be projected onto the projection receiving surface through the light outlets 1005 on the housing 1001.

[0032] Please see Figure 1 and Figure 2In this embodiment, the light-emitting module 10 is disposed within the housing 1001 and is used to emit light rays with a certain beam shape. The light-emitting module 10 is disposed toward the light-reflecting element 20 so that the light rays can propagate to the light-reflecting element 20. In this embodiment, the light-emitting module 10 may include a light source 11, which is used to form light rays. The light source 11 can be a coherent light source or an incoherent light source. This embodiment does not impose specific limitations on this and can be configured according to actual usage requirements. As an example, the light source 11 can be a laser generator, that is, the incident light is laser light. For example, the light source 11 can be a single-wavelength monochromatic laser generator, such as a green laser generator or a red laser generator, etc.; it can also be a panchromatic laser generator (i.e., red, green, and blue), or it can be a tunable broadband laser generator. A tunable broadband laser generator can generate and emit laser light of a specified wavelength. This embodiment does not impose specific limitations on this. As another example, the light source 11 can be a high-pressure gas light source 11 such as a halogen bulb, a UHP (ultra-high pressure mercury bulb), or a UHE (ultra-high pressure mercury bulb), or an LED light source 11, etc. For example, the light source 11 can be a monochrome LED bead or a multi-color LED bead. Multi-color LED beads can emit a variety of different colors of light to form a variety of projection effects.

[0033] To ensure that the light emitted by the light source 11 has a beam shape so that the projection module forms a specific pattern, such as star points, on the projection receiving surface, the light-emitting module 10 may further include a beam shaping component 12. Specifically, the beam shaping component 12 is located in the optical path of the light emitted by the light source 11 and is used to adjust and control the light. The beam shaping component 12 may be an aperture, lens, grating, or window, etc., and this embodiment does not impose specific limitations on it; it can be set according to actual usage requirements. In this embodiment, the beam shaping component 12 may be provided with a light-transmitting aperture 13. The light emitted by the light source 11 propagates through the light-transmitting aperture 13 to the outside of the light-emitting module 10 to form light from the light source. The light-transmitting aperture 13 is used to define the beam shape of the light from the light source. As an example, the shape of the light from the light source varies depending on the shape of the light-transmitting aperture 13. For example, when the shape of the light-transmitting aperture 13 is circular, the beam is a columnar beam and forms a circular light spot on the projection receiving surface; when the shape of the light-transmitting aperture 13 is rectangular, the beam is a rectangular beam and forms a rectangular light spot on the projection receiving surface. Understandably, the shape of the light-transmitting hole 13 can also be elliptical, star-shaped, heart-shaped, etc., and can be set according to actual usage requirements.

[0034] In some embodiments, the number of light-passing holes 13 can be two or more, with at least two light-passing holes 13 having different shapes, thereby forming at least two different beam shapes of light from the light source and creating at least two different projection effects on the projection receiving surface to improve the user's visual experience. It is understood that the apertures of the at least two light-passing holes 13 can be different to adjust the brightness and size of the light spot, thereby improving the sense of depth in the projected image. This embodiment does not impose a specific limitation on the aperture size of the light-passing holes 13, and it can be set according to actual usage requirements.

[0035] To reduce the space occupied by the light source 11 and the beam shaping component 12, thereby miniaturizing the projection device 100, the light-emitting module 10 may further include a bracket 14. The bracket 14 connects the light source 11 and the beam shaping component 12, so that after assembly, the three components form a compact module, reducing the overall volume of the light-emitting module 10. Specifically, the bracket 14 has a mounting groove 141 located on the side of the bracket 14 facing the light deflector 20. The light source 11 is detachably mounted within the mounting groove 141 to connect with the bracket 14. The beam shaping component 12 is mounted on the bracket 14 and covers the mounting groove 141, ensuring that all light emitted from the light source 11 exits through the beam shaping component 12. This reduces light scattering and leakage within the mounting groove 141, improving the projection brightness of the projection device 100. Meanwhile, the beam shaping component 12 covers the mounting groove 141, which can provide a relatively stable working environment for the light source 11 and reduce the interference of external impurities and moisture on the light source 11.

[0036] In this embodiment, the light rays generated by the light-emitting module 10 can be deflected by the light-reflecting element 20 to a path deviating from the light path formed by the light rays, thereby achieving projection onto the projection device 100 on the light path away from the light rays. Specifically, the light-reflecting element 20 is located on the light path of the light rays and is used to deflect the light rays to form deflected light rays, the propagation direction of which deviates from the propagation direction of the light rays. This embodiment does not limit the specific type of the light-reflecting element 20; it can be an optical device capable of reflecting or refracting light, such as a reflector, a photorefractive crystal, or a grating. As a specific example, the light-reflecting element 20 can be a mirror, such as a prism, where the light rays are reflected or refracted when they come into contact with the prism surface to deviate from the predetermined propagation direction, thus forming deflected light rays.

[0037] Please see Figure 2 and Figure 3In this embodiment, the optical refractor 20 has an optical axis O, which is substantially parallel to the bottom wall 1002 of the housing 1001. Specifically, the optical refractor 20 may include a connecting portion 21 and multiple reflecting portions 22. The multiple reflecting portions 22 are respectively connected to the connecting portion 21, and the optical axis O passes through at least a portion of the structure of the multiple reflecting portions 22. In this embodiment, the connecting portion 21 forms the base of the optical refractor 20, and is at least partially connected to the housing 1001 to securely connect the optical refractor 20 and the housing 1001. The multiple reflecting portions 22 are used to reflect or refract the received light from the light source to form multiple refracted light beams. It is understood that the more reflecting portions 22 there are, the more refracted light beams are formed, so that the multiple refracted light beams can be distributed at multiple different positions on the beam splitter 40 and emitted onto the projection receiving surface, effectively increasing the number of projected light spots and forming a multi-point projection effect. This embodiment does not limit the specific structure of the reflecting part 22. For example, the reflecting part 22 can be a reflecting prism, a concave lens, a convex lens, a plane mirror, a grating, etc., and can be set according to actual usage requirements. As just a specific example, the reflecting part 22 can be a plane mirror. Multiple plane mirrors have the same angle with the optical axis O, so that when the light from the light source comes into contact with the plane mirror, it will be refracted or reflected at the same angle to ensure that the propagation direction of the refracted light is consistent, thereby increasing the probability of light entering the beam splitter 40 and improving the utilization rate of light.

[0038] Please see Figure 3 and Figure 4 In some embodiments, multiple reflective portions 22 are recessed toward the central region 231 of the surface of the light-emitting module 10 to give the central region 231 a stronger focusing effect. This focusing effect enables the brightness of a portion of the projected image on the projection receiving surface to be higher, improving the sense of layering of the projected image and thus enhancing the user's visual experience. Specifically, the light-reflecting element 20 has a reflective surface 23, which is used to reflect or refract light from the light source. Multiple reflective portions 22 are arranged toward the surface of the light-emitting module 10 to form the reflective surface 23. The reflective surface 23 is roughly divided into a central region 231 and an edge region 232. The edge region 232 surrounds the outer periphery of the central region 231, and the optical axis O passes through the central region 231. As a result, most of the light from the light source is concentrated in the central region 231, and a small portion propagates to the edge region 232. Therefore, the brightness of the portion of the refracted light formed by reflection or refraction through the central region 231 is relatively high, while the brightness of the portion of the refracted light formed by reflection or refraction through the edge region 232 is relatively low.

[0039] Furthermore, in some embodiments, the reflective portion 22 may have a textured structure (not shown in the figure), which is used to enhance the projection light effect. The textured structure differs in the central region 231 and the edge region 232, thereby creating different projection effects to further enhance the user's visual experience. As an example, the shape of the textured structure in the central region 231 is different from that in the edge region 232; for example, the textured structure in the central region 231 is a striped texture, while the textured structure in the edge region 232 is a wavy texture. Alternatively, the density distribution of the textured structure in the central region 231 is sparser, while the textured structure in the edge region 232 is denser, in order to reduce the probability of overlap of the projected light spots formed in the central region 231 and to increase the number of projected light spots formed in the edge region 232.

[0040] This embodiment does not limit the arrangement of the multiple reflective parts 22, and can be configured according to actual usage requirements. As an example, the light deflector 20 can be arranged in a ring shape. For example, multiple reflective parts 22 are connected sequentially and arranged around the optical axis O, which facilitates the reception of light rays from multiple directions and the refracting of light rays from multiple directions to form refracted rays, thereby improving the refracting efficiency of the light deflector 20. Another example is that multiple reflective parts 22 are connected sequentially, with a connecting angle between adjacent reflective parts 22, that is, the multiple reflective parts 22 can be arranged approximately in a V-shape. By setting the reflective parts 22 in the above two arrangements, the light source light can be received as much as possible to improve light utilization, and the fact that multiple reflective parts 22 do not overlap can improve refracting efficiency. Furthermore, the same beam of light can be further reflected or refracted between the multiple reflective parts 22 to form multiple refracted rays, which can increase the number of projected light spots and improve projection.

[0041] Please see Figure 3 and Figure 4 In this embodiment, the first driving device 30 is connected to the optical refractor 20 to drive the optical refractor 20 to rotate, thereby increasing the randomness of the distribution of refracted light rays on the beam splitter 40. Specifically, the connecting portion 21 of the optical refractor 20 may be provided with a connecting groove 211, and the first driving device 30 is disposed in the connecting groove 211 to achieve a fixed connection with the optical refractor 20. The output shaft of the first driving device 30 is connected to multiple reflecting portions 22 to drive the multiple reflecting portions 22 to rotate, thereby changing the orientation of the optical refractor 20 and thus changing the propagation angle of the refracted light rays. When the orientation of the optical refractor 20 is different, the same beam of refracted light rays can propagate to different positions on the beam splitter 40, thereby improving the randomness of the distribution of refracted light rays on the beam splitter. This embodiment does not limit the specific type of the first driving device 30, such as a drive motor, a rotary servo, or other driving components. This application does not limit the rotation angle and direction of the first driving device 30 driving the optical refractor 20, and can set it according to actual usage requirements.

[0042] Furthermore, the first driving device 30 is also used to create dynamic projection effects to further enhance the user's visual experience. Specifically, during the projection process of the projection device 100, the optical refractor 20 can rotate or oscillate around the optical axis O under the action of the first driving device 30. As a result, some light rays from the light source cannot be emitted onto the optical refractor 20, causing changes in the brightness or position of the projection spot on the projection receiving surface, thus creating various projection light effects. In addition, during the refracting process, the same refracted light beam propagates to different positions on the beam splitter 40 due to different rotation or oscillation angles of the optical refractor 20, and is emitted onto the projection receiving surface. This effectively improves the randomness of the distribution of refracted light rays on the beam splitter 40, thereby creating a variety of different projection effects. At the same time, because the optical refractor 20 rotates or oscillates around the axis O, the same refracted light beam will also propagate dynamically from the same deflection angle to the same position on the beam splitter 40 and be emitted onto the projection receiving surface, creating a twinkling star effect at the same position on the projection receiving surface, thus enhancing the user's visual experience. In this embodiment, the rotation speed of the first driving device 30 driving the optical refracting component 20 is not limited, and can be set according to actual usage requirements.

[0043] Please see Figure 6 In some embodiments, to enable the projection device 100 to form more projection spots and further improve the randomness of the distribution of the deflected beam at the beam splitter 40, the number of optical deflectors 20 can be multiple. One optical deflector 20 is positioned facing the light-emitting module 10, the beam splitter 40 is positioned in the optical path of one of the optical deflectors 20, and the remaining optical deflectors 20 can be positioned between the two optical deflectors 20. This allows the same deflected beam to be deflected on adjacent optical deflectors 20 to further form multiple deflected beams, effectively increasing the number of beams entering the beam splitter 40, thereby increasing the number of projection spots on the projection receiving surface and forming various projection light effects. This application does not limit the specific number of optical deflectors 20; for ease of explanation, this embodiment uses two optical deflectors 20 as an example.

[0044] Specifically, the two optical refracting elements 20 include a first optical refracting element 24 and a second optical refracting element 25. The first optical refracting element 24 can be located in the optical path of the light source and is positioned towards the light-emitting module 10. The second optical refracting element 25 can be located in the optical path of the first optical refracting element 24 and is opposite to the beam splitter 40. Thus, the light source light generated by the light-emitting module 10 can propagate to the first optical refracting element 24 and form a first refracted light ray through reflection or refraction. A beam of first refracted light emitted from the first optical refracting element 24 is then reflected or refracted by the second optical refracting element 25 to form multiple beams of second refracted light ray. These multiple second refracted light rays are then split by the beam splitter 40 and emitted to the projection receiving surface, thereby forming multiple projection light spots and multiple projection light effects on the projection receiving surface. The propagation direction of the deflected ray emitted from the second optical deflector 25 (the second deflected ray) can be opposite to that of the light source ray. This means that projection onto the side away from the light-emitting module 10 can be achieved without moving or rotating the projection device 100. This allows for more complex optical effects within a compact projection device 100, further improving its reliability and flexibility. It is understood that the propagation direction of the second deflected ray can also be at an angle to the propagation direction of the light source ray, and can be set according to actual usage requirements.

[0045] When the optical deflector 20 includes a first optical deflector 24 and a second optical deflector 25, the first driving device 30 can be connected to at least one of the first optical deflector 24 and the second optical deflector 25 to increase the randomness of the distribution of the deflected beam on the beam splitter, thereby further improving the projection light effect and forming a dynamic light spot. As an example, the first driving device 30 can be connected to either the first optical deflector 24 or the second optical deflector 25, so that the orientation of the reflector 22 of one of the two optical deflectors 20 is adjustable, thereby enabling the formation of deflected light rays with different propagation directions. As another example, the first driving device 30 can be simultaneously connected to the first optical deflector 24 and the second optical deflector 25 via a transmission component, so that the two optical deflectors 20 rotate synchronously. The transmission component can specifically include chain drives, gear drives, belt drives, etc., and this embodiment does not limit the transmission form of the transmission component.

[0046] As another example, there can be two first driving devices 30, one connected to the first optical refracting element 24 and the other connected to the second optical refracting element 25. Thus, when the first optical refracting element 24 rotates to different angles, the same light source beam can form multiple first refracted beams at different locations on the first optical refracting element 24. Similarly, when the second optical refracting element 25 rotates to different positions, the same first refracted beam can form multiple second refracted beams at different locations on the second optical refracting element 25, further increasing the randomness of the light source beam distribution on the beam splitter 40, thereby improving the projection effect. Specifically, the first optical refracting element 24 has a first optical axis O1 and rotates or oscillates around the first optical axis O1, and the second optical refracting element 25 has a second optical axis O2 and rotates or oscillates around the second optical axis O2. One of the first driving devices 30 is connected to the first optical refracting element 24 and has a first rotation axis. The first rotation axis and the first optical axis O1 can be parallel or coincident, ensuring that the direction of the first optical axis O1 does not deviate when the first driving device 30 rotates the first optical refracting element 24, thus improving the accuracy of the optical path adjustment. Similarly, the other first driving device 30 is connected to the second optical refracting element 25 and has a second rotation axis. The second rotation axis and the second optical axis O2 can be parallel or coincident.

[0047] Please refer to it again. Figure 3 In this embodiment, the beam splitter 40 is disposed in the optical path of the optical refractor 20. The light rays refracted by the optical refractor 20 can be diffused at the beam splitter 40 to form multiple outgoing light beams, and multiple projection light spots are formed at the projection receiving surface. Specifically, the beam splitter 40 includes a connector 42 and a body part 43. The connector 42 is connected to the body part 43 and fixed inside the housing 1001. The body part 43 is at least partially disposed facing the optical refractor 20 to receive the refracted light rays. The beam splitter 40 may be provided with multiple light diffusion parts 41. The multiple light diffusion parts 41 are disposed on the body part 43. The multiple light diffusion parts 41 face each other on the surface of the optical refractor 20 to form the light diffusion surface 411 of the beam splitter 40. The refracted light rays are reflected or refracted at the light diffusion surface 411 to form multiple outgoing light beams. In some embodiments, the projected light effects formed by the multiple light diffusion sections 41 can be different. For example, one of the light diffusion sections 41 can be provided with a textured structure, one of the diffusion sections 41 can be provided with a pattern, or for example, the shape and size of one of the light diffusion sections 41 can be different from the other light diffusion sections 41. It can be set according to actual usage requirements to form a variety of projected light effects.

[0048] This embodiment does not limit the structure of the light diffusion section 41. For example, the light diffusion section 41 can be a protruding structure or a groove structure; the light diffusion section 41 can also be an optical structure such as a microlens to reflect or refract light. In this embodiment, the light diffusion surface 411 can be a curved surface to allow the refracted light to diffuse more uniformly and improve the uniformity of the emitted light. In addition, due to its smooth curved surface structure, scattering and loss of light during the diffusion process can be reduced, improving the utilization rate of light. This embodiment does not limit the specific structure of the light diffusion surface 411. For example, the light diffusion surface 411 can be recessed relative to the light refraction member 20 or protruding relative to the light refraction member 20, and can be set according to actual requirements.

[0049] In some embodiments, the projection device 100 may further include a second driving device 50, which is connected to the beam splitter 40 to drive the beam splitter 40 to rotate, thereby forming a dynamic projection effect. Specifically, the connector 42 may be provided with a mounting portion 421, which is used to cooperate with the second driving device 50 to achieve the connection and fixation of the second driving device 50 and the connector 42. For example, the mounting portion 421 may be a groove structure, and the second driving device 50 is housed in the mounting portion 421 to reduce the overall volume of the projection device 100. The beam splitter 40 may have a third optical axis O3, and the second driving device 50 may have a third rotation axis. The third rotation axis and the third optical axis O3 may be arranged in parallel or coincidentally to ensure that the direction of the third optical axis O3 does not shift when the second driving device 50 rotates the beam splitter 40, thereby improving the accuracy of the optical path adjustment. When the second driving device 50 drives the beam splitter 40 to rotate, some of the refracted light rays cannot reach the beam splitter 40, thus changing the brightness or position of the light spot formed on the projection receiving surface to create a dynamic effect similar to twinkling stars. Users can adjust the rotation speed of the beam splitter 40 by adjusting the output power of the second driving device according to their actual needs, thereby controlling the twinkling frequency of the stars to create different projection effects and improve the user's visual experience.

[0050] In some embodiments, the projection device 100 may further include a condenser lens 60, which is disposed between the optical deflector 20 and the beam splitter 40 to converge the deflected light rays, thereby focusing the light onto the beam splitter 40 and improving the brightness of the projected light spot. The condenser lens 60 may have a fourth optical axis O4, which intersects with the third optical axis O3, ensuring that most of the deflected light rays entering the condenser lens 60 can enter the beam splitter 40 to improve light utilization.

[0051] In summary, this application provides a projection device 100, which includes a light-emitting module 10, a light-refracting element 20, a first driving device 30, and a beam splitter 40. The first driving device 30 is connected to the light-refracting element 20 to drive its rotation, thereby causing the refracted light rays to propagate to the beam splitter 40 along a dynamic path. This increases the randomness of the distribution of the refracted light rays at the beam splitter 40; that is, when the light-refracting element 20 rotates, the same refracted light beam can propagate to different positions on the beam splitter 40 and exit due to different angles, thus forming various projection effects. Furthermore, during the rotation of the light-refracting element 20, the same refracted light beam will switch back and forth between at least two positions on the beam splitter 40, forming a dynamic projection effect similar to twinkling stars, thereby improving the user experience. Furthermore, the beam splitter 40 is provided with multiple light diffusion sections 41. On the one hand, the multiple light diffusion sections 41 can make the light more evenly distributed in each emission direction, thereby avoiding the problem of local overbrightness or underbrightness of the projected image caused by light concentration, and improving the uniformity of the projection device 100. On the other hand, the multiple light diffusion sections 41 can make a beam of refracted light diffuse into multiple beams of emitted light to form multiple projection light spots. The multiple projection light spots are superimposed to form a projection pattern, which can improve the imaging effect of the projection pattern and further enhance the user's visual experience.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A projection device, characterized in that, The projection device includes: The light-emitting module is used to emit light from the light source; An optical deflector is located in the optical path of the light source, and the optical deflector is used to deflect the light source to form a deflected light ray; A first driving device is connected to the optical deflector to change the propagation angle of the deflected light rays; and A beam splitter is located on the optical path of the refracted light ray. The beam splitter is provided with multiple light diffusion sections. After the refracted light ray passes through the multiple light diffusion sections, it forms multiple outgoing beams.

2. The projection device as described in claim 1, characterized in that, The number of optical refracting elements is two, including a first optical refracting element and a second optical refracting element. The first driving device is connected to at least one of the first optical refracting element and the second optical refracting element. The first optical refracting element is located in the optical path of the light source, and the second optical refracting element is located in the optical path formed by the first optical refracting element. The propagation direction of the refracted light emitted from the second optical refracting element is opposite to the propagation direction of the light source.

3. The projection device as described in claim 2, characterized in that, The first optical refracting element has a first optical axis, the second optical refracting element has a second optical axis, and there are two first driving devices, one of which is connected to the first optical refracting element and has a first rotation axis, the first rotation axis being parallel or coincident with the first optical axis; the other of which is connected to the second optical refracting element and has a second rotation axis, the second rotation axis being parallel or coincident with the second optical axis.

4. The projection device as claimed in claim 1, characterized in that, The optical refracting element has an optical axis and includes a connecting part and a plurality of reflecting parts. The plurality of reflecting parts are respectively connected to the connecting part. The optical axis passes through at least a portion of the structure of the plurality of reflecting parts. The plurality of reflecting parts are used to reflect the light from the light source to form multiple beams of refracted light.

5. The projection device as described in claim 4, characterized in that, The plurality of the reflective parts are arranged around the optical axis; or, the plurality of the reflective parts are connected in sequence, with a connecting angle between two adjacent reflective parts.

6. The projection device as claimed in claim 4, characterized in that, The reflective part is a plane mirror, and the included angle between the multiple plane mirrors and the optical axis is the same.

7. The projection device as claimed in claim 4, characterized in that, The multiple reflective portions are arranged facing the surface of the light-emitting module to form the reflective surface of the light-refracting element; the reflective surface has a central region and an edge region surrounding the central region, the optical axis passes through the central region, and the central region is recessed relative to the edge region.

8. The projection device according to any one of claims 1 to 7, characterized in that, The projection device further includes a second driving device connected to the beam splitter. The beam splitter has a third optical axis, and the second driving device has a third rotation axis, which is parallel to or coincides with the third optical axis.

9. The projection device as claimed in claim 8, characterized in that, The projection device further includes a condenser lens, which is disposed between the optical refracting element and the beam splitter. The condenser lens has a fourth optical axis, which intersects with the third optical axis.

10. The projection device according to any one of claims 1 to 7, characterized in that, Multiple light-diffusing portions are arranged side-by-side facing the surface of the light-refracting element to form the light-diffusing surface of the beam splitter, and the light-diffusing surface is curved; the light-diffusing surface is concave relative to the light-refracting element or protrudes toward the light-refracting element.

11. The projection device according to any one of claims 1 to 7, characterized in that, The light-emitting module includes a bracket, a light source, and a beam shaping component. The bracket has a mounting groove, the light source is disposed in the mounting groove, and the beam shaping component covers the mounting groove. The beam shaping component has a light-transmitting hole, through which the light generated by the light source propagates to the outside of the mounting groove to form the light source light. The light-transmitting hole defines the beam shape of the light source light.

Images