Laser speckle reducer and projection device

Abstract

The present application relates to a laser speckle reducer and a projection device. The laser speckle reducer comprises: a stator part, a vibration assembly, a first diffuser, a mover part, and a second diffuser; the stator part comprises a substrate; the vibration assembly is disposed on the substrate; the first diffuser is disposed on the substrate; the mover part comprises an elastic assembly, and the elastic assembly is connected to the substrate; the second diffuser is disposed on the elastic assembly, and the second diffuser is arranged opposite to the first diffuser; when the vibration assembly vibrates, the elastic assembly drives the second diffuser to vibrate by means of resonance, and the second diffuser is configured to move relative to the first diffuser. The present application can reduce or eliminate the effect of laser speckle, without the need for an electromagnetic system, thereby reducing the number of components and simplifying the structure.

Description

Laser speckle eraser and projection equipment

[0001] This application claims priority to patent application filed on October 29, 2024, with application number 202422635711.8, entitled "Laser Speckle Eliminator and Projection Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of projection display technology, and in particular to a laser speckle eliminater and projection device. Background Technology

[0003] As a new generation of projection light source, laser has the characteristics of high brightness, good monochromaticity and small emission angle. However, due to the high coherence of laser, projection products using laser are usually accompanied by speckle phenomenon, which affects the consumer experience.

[0004] Various measures have been taken in related technologies to improve the speckle problem of lasers. For example, a voice coil motor vibrates horizontally and drives a diffuser to vibrate in the same way, thereby eliminating laser speckle. To achieve horizontal vibration, a combination of electromagnetic and spring systems is required, along with a supporting structure to support the electromagnetic and spring systems, resulting in a large number of components and a relatively complex structure. Summary of the Invention

[0005] The purpose of this application is to provide a device that generates vibration through a vibration component and drives the elastic component and the second diffuser to vibrate through the resonance principle, thereby creating relative motion between the second diffuser and the first diffuser, effectively improving the speckle removal effect of the laser beam, and eliminating the need for an electromagnetic system, reducing the number of components, and simplifying the structure.

[0006] In a first aspect, this application provides a laser speckle eliminator, comprising: a stator portion, a vibration assembly, a first diffuser, a mover portion, and a second diffuser. The stator portion includes a substrate; the vibration assembly is disposed on the substrate; the first diffuser is disposed on the substrate; the mover portion includes an elastic assembly connected to the substrate; the second diffuser is disposed on the elastic assembly and is disposed opposite to the first diffuser; wherein, when the vibration assembly vibrates, the elastic assembly drives the second diffuser to vibrate through resonance, and the second diffuser is configured to move relative to the first diffuser.

[0007] In one possible implementation, the elastic component has a first plane, a first diffuser plate is parallel to the first plane, a second diffuser plate is parallel to the first plane, a vibration component vibrates along the first plane, and the elastic component is configured to drive the second diffuser plate to vibrate along the first plane.

[0008] In one possible implementation, the elastic component is configured to drive the second diffuser to vibrate, the natural frequency of which is equal to the vibration frequency of the vibrating component.

[0009] In one possible implementation, the elastic component has a double-layer elastic structure for mounting a second diffuser sheet.

[0010] In one possible implementation, the elastic component includes a first spring and a second spring, with a second diffuser sandwiched between the first spring and the second spring.

[0011] In one possible implementation, the first spring includes a first outer ring, a first inner ring, and a first cantilever, the first cantilever being configured to connect the first outer ring and the first inner ring, the first outer ring being connected to a substrate; the second spring includes a second outer ring, a second inner ring, and a second cantilever, the second cantilever being configured to connect the second outer ring and the second inner ring, the second outer ring being connected to a substrate; a second diffuser is sandwiched between the first inner ring and the second inner ring; the first cantilever and the second cantilever are at least one of a frame structure, a strip structure, a U-shaped structure, and an L-shaped structure.

[0012] In one possible implementation, the resilient component further includes a connector located between the first cantilever and the second cantilever, with one end of the connector connected to the first cantilever and the other end connected to the second cantilever.

[0013] In one possible implementation, the first cantilever includes a first frame and a first connecting portion. Multiple first frames are arranged sequentially from the inside out. The first connecting portion is configured to connect two adjacent first frames. The second cantilever includes a second frame and a second connecting portion. Multiple second frames are arranged sequentially from the inside out. The second connecting portion is configured to connect two adjacent second frames. One first frame and one second frame are arranged in a one-to-one correspondence. Multiple connectors are provided. Some connectors are configured to connect the end corners of the first frame and the end corners of the second frame, and some connectors are configured to connect the first connecting portion and the second connecting portion.

[0014] In one possible implementation, a first positioning part is provided on a first outer ring, a second positioning part is provided on a second outer ring, and a third positioning part is provided on a substrate, wherein the third positioning part is configured to position the first positioning part and the second positioning part.

[0015] In one possible implementation, the substrate has a first surface and a second surface, which are disposed opposite to each other. A mover portion is disposed on the first surface of the substrate, a vibration assembly is disposed on the second surface of the substrate, a first diffuser sheet is disposed on the second surface of the substrate, and one side of the outer periphery of the vibration assembly is attached to one side of the outer periphery of the first diffuser sheet.

[0016] In one possible implementation, a mounting cantilever is provided on the substrate, with the fixed end of the mounting cantilever disposed adjacent to the vibration component, or the fixed end of the mounting cantilever is disposed in contact with the vibration component, and the free end of the mounting cantilever is configured to connect to an external structure.

[0017] Secondly, this application provides a projection device, including: a laser source for generating an incident beam; and a laser speckle eliminator as described above, disposed in the optical path of the laser source.

[0018] The technical solutions provided in this application have the following advantages compared with the prior art:

[0019] This laser speckle eliminator includes a stator, a vibration assembly, a first diffuser, a mover, and a second diffuser. The stator includes a substrate; the vibration assembly is disposed on the substrate; the first diffuser is disposed on the substrate; the mover includes an elastic assembly connected to the substrate; and the second diffuser is disposed on the elastic assembly, with the second diffuser positioned opposite to the first diffuser. When the vibration assembly vibrates, the elastic assembly resonates, causing the second diffuser to vibrate, thus enabling relative motion between the second and first diffusers. Therefore, by generating vibration through the vibration assembly and driving the elastic assembly and second diffuser to vibrate through resonance, relative motion is generated between the second and first diffusers, thereby reducing or eliminating laser speckle. This eliminates the need for an electromagnetic system, reduces the number of components, and simplifies the structure. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0022] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0023] Figure 1 is a schematic diagram of the exploded structure of a laser speckle eliminator provided in an embodiment of this application;

[0024] Figure 2 is a three-dimensional structural diagram of the moving part provided in an embodiment of this application;

[0025] Figure 3 is a schematic diagram of the exploded structure of the moving part provided in an embodiment of this application;

[0026] Figure 4 is a three-dimensional structural diagram of the first spring sheet provided in an embodiment of this application;

[0027] Figure 5 is a three-dimensional structural diagram of the second spring sheet provided in the embodiment of this application;

[0028] Figure 6 is a three-dimensional structural diagram of the substrate provided in an embodiment of this application;

[0029] Figure 7 is a structural schematic diagram of the substrate provided in an embodiment of this application from another angle;

[0030] Figure 8 is an exploded view of the moving part and the substrate provided in an embodiment of this application;

[0031] Figure 9 is a three-dimensional structural diagram of the mover portion and the substrate provided in an embodiment of this application;

[0032] Figure 10 is a schematic diagram of the exploded structure of the vibration component, the first diffuser and the substrate provided in the embodiment of this application;

[0033] Figure 11 is a three-dimensional structural diagram of the vibration component, the first diffuser sheet, and the substrate provided in the embodiment of this application.

[0034] Explanation of reference numerals in the attached drawings: a) First plane; X) First direction; Y) Second direction; 1) Stator portion; 11) Substrate; 111) Third positioning part; 112) First surface; 113) Second surface; 114) Mounting cantilever; 1141) Fixed end; 1142) Free end; 115) Light transmission hole; 12) Vibration assembly; 121) Vibration motor; 122) Flexible circuit board; 13) First diffuser sheet; 2. Moving part; 21. Elastic component; 211. First spring piece; 2111. First outer ring; 2112. First inner ring; 2113. First cantilever; 21131. First frame; 21132. First connecting part; 2114. First positioning part; 2115. First adhesive part; 212. Second spring piece; 2121. Second outer ring; 2122. Second inner ring; 2123. Second cantilever; 21231. Second frame; 21232. Second connecting part; 2124. Second positioning part; 2125. Second adhesive part; 213. Connector; 22. Second diffuser. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0037] Laser beams are characterized by high brightness, good monochromaticity, and a small emission angle, while also exhibiting high coherence. This high coherence can cause speckle effects in laser projection displays. The speckle effect refers to the phenomenon where, when a coherent light source illuminates an optically rough surface such as a wall, paper, or frosted glass (where the average undulation is orders of magnitude greater than the laser wavelength), the scattered light interferes in space due to a constant phase difference, identical light wave frequency, and consistent vibration direction. Some interference is constructive, while other interference is destructive, resulting in a random spatial intensity distribution and a granular structure. The end result is the appearance of alternating bright and dark spots on the screen, i.e., speckle. These unfocused spots appear flickering to the human eye, causing discomfort during prolonged viewing and severely impacting the quality of the projected image, thus reducing the user's viewing experience.

[0038] Therefore, this application provides a laser speckle eliminator that eliminates the need for an electromagnetic system, reduces the number of components, and has a simple structure.

[0039] As shown in Figures 1 to 11, the laser speckle eliminator provided in this application embodiment includes: a stator part 1 and a mover part 2.

[0040] The stator part 1 includes a substrate 11, a vibration assembly 12 and a first diffuser 13. The vibration assembly 12 is disposed on the substrate 11 and the first diffuser 13 is disposed on the substrate 11.

[0041] The moving part 2 includes an elastic component 21 and a second diffuser 22. The elastic component 21 is configured to be connected to the substrate 11, and the second diffuser 22 is disposed on the elastic component 21. The second diffuser 22 is disposed opposite to the first diffuser 13. When the vibration component 12 vibrates, the elastic component 21 drives the second diffuser 22 to vibrate through resonance, and the second diffuser 22 is configured to move relative to the first diffuser 13.

[0042] In this application, vibration is generated by the vibration component 12, and the elastic component 21 and the second diffuser 22 are driven to vibrate through the resonance principle. In this way, relative motion is generated between the second diffuser 22 and the first diffuser 13, thereby reducing or eliminating laser speckle. There is no need to set up an electromagnetic system, reducing the number of parts and simplifying the structure.

[0043] In related technologies, laser speckle elimination generally includes:

[0044] Diffusion wheel method: This method uses a transfer motor to drive a diffuser plate in a high-speed rotation. When the laser passes through the diffuser plate, it produces beams of light at different angles. The superposition of these beams creates a speckle-eliminating visual effect. However, the transfer motor itself cannot be made very small and is expensive. High-speed transfer can cause friction and chipping, easily jamming the rotor and burning out the motor; the larger the diffuser plate, the higher the cost.

[0045] Laser speckle eliminator: This device eliminates laser speckle by using a voice coil motor to vibrate horizontally, which in turn causes a diffuser to vibrate in the same manner. Achieving horizontal vibration requires a combination of electromagnetic and spring systems, along with a supporting structure to support both systems. This results in a large number of components, a complex structure, and a complex assembly process.

[0046] Deformable mirror method: This method uses a mirror surface that can undergo microscopic deformation to reflect a laser beam, thereby changing the phase of the beam to eliminate speckle. It utilizes the piezoelectric principle to deform each micro-unit of the mirror surface. This results in extremely high material and production costs, making it suitable only for high-end optical equipment; ordinary projectors cannot afford it.

[0047] The laser speckle eliminator provided in this application utilizes the principle of resonance to transmit the vibration of the vibrating component 12 to the elastic component 21, causing the elastic component 21 to drive the second diffuser 22 to vibrate at the same frequency. This relative motion between the first diffuser 13 and the second diffuser 22 reduces or eliminates laser speckle. It eliminates the need for an electromagnetic system, resulting in a simpler structure and easier assembly and production. Furthermore, by omitting some structural elements, it can be made smaller and less expensive.

[0048] For example, the elastic component 21 has a double-layer elastic structure for mounting the second diffuser 22. In this way, the second diffuser 22 can be driven to vibrate in accordance with the vibration of the vibration component 12 through the double-layer elastic structure.

[0049] As shown in Figure 3, in some embodiments, the elastic component 21 has a first plane a, which is one of two opposing surfaces of the elastic component 21; or the first plane a is parallel to the two surfaces of the elastic component 21, and the distances from the first plane a to the two surfaces are equal. The first diffuser 13 is parallel to the first plane a, and the second diffuser 22 is parallel to the first plane a. The elastic component 21 drives the second diffuser 22 to vibrate along the first plane a, and the vibration component 12 vibrates along the first plane a. Specifically, the vibration of the vibration component 12 along the first plane a means that the vibration direction of the vibration component 12 is perpendicular to the vertical line of the first plane a, which can be along any direction of the first plane a. Under the drive of the vibration component 12, the elastic component 21 drives the second diffuser 22 to vibrate along the first plane a through resonance.

[0050] In this application, the first diffuser 13 and the second diffuser 22 are arranged in parallel. When the vibration component 12 vibrates along the first plane a, it can drive the elastic component 21 together with the second diffuser 22 to vibrate along the first plane a, thereby causing relative movement between the first diffuser 13 and the second diffuser 22 in the direction along the first plane a, thereby reducing or eliminating laser speckle and ensuring the effect of eliminating laser speckle.

[0051] In some embodiments, the elastic component 21 is configured to drive the second diffuser 22 to vibrate, and the natural frequency of the vibration of the second diffuser 22 is equal to the vibration frequency of the vibration component 12.

[0052] In this application, the natural frequency of the elastic component 21 is equal to the vibration frequency of the vibration component 12. When the vibration component 12 vibrates, it can drive the elastic component 21 to vibrate at the same frequency. Under resonance conditions, the required energy is minimal. That is, only a small amount of vibration energy from the vibration component 12 is needed to generate a large amount of vibration in the elastic component 21, thereby significantly reducing power consumption. Compared with existing laser speckle eliminators with electromagnetic systems, this method can save energy at the same vibration frequency.

[0053] As shown in Figures 2 and 3, in some embodiments, the elastic component 21 includes a first spring sheet 211 and a second spring sheet 212, with a second diffuser sheet 22 sandwiched between the first spring sheet 211 and the second spring sheet 212.

[0054] In this application, by sandwiching the second diffuser 22 between the first spring 211 and the second spring 212, it can be ensured that the second diffuser 22 vibrates along the first plane a, thus ensuring the stability of the vibration of the second diffuser 22.

[0055] Specifically, the second diffuser 22 is fixed to the first spring 211 and the second spring 212 with glue to ensure the firmness of the installation of the second diffuser 22.

[0056] As shown in Figures 4 and 5, in some embodiments, the first spring piece 211 includes a first outer ring 2111, a first inner ring 2112, and a first cantilever 2113. The first cantilever 2113 is configured to connect the first outer ring 2111 and the first inner ring 2112. The first outer ring 2111 is connected to the substrate 11. The second spring piece 212 includes a second outer ring 2121, a second inner ring 2122, and a second cantilever 2123. The second cantilever 2123 is configured to connect the second outer ring 2121 and the second inner ring 2122. The second outer ring 2121 is connected to the substrate 11. The second diffuser 22 is sandwiched between the first inner ring 2112 and the second inner ring 2122. The first cantilever 2113 and the second cantilever 2123 are at least one of a frame structure, a strip structure, a U-shaped structure, and an L-shaped structure, respectively.

[0057] In this application, the first outer ring 2111 of the first spring 211 is connected to the substrate 11, and the second outer ring 2121 of the second spring 212 is connected to the substrate 11. The first inner ring 2112 can vibrate relative to the first outer ring 2111 along the first plane a through the first cantilever 2113, and the second inner ring 2122 can vibrate relative to the second outer ring 2121 along the first plane a through the second cantilever 2123. The second diffuser 22 is fixed between the first inner ring 2112 and the second inner ring 2122 to ensure that the second diffuser 22 can vibrate along the first plane a and to ensure the stability of the vibration of the second diffuser 22 along the first plane a.

[0058] Specifically, both the first cantilever 2113 and the second cantilever 2123 are frame structures. The inner side of the first cantilever 2113 is connected to the first inner ring 2112, and the outer side of the first cantilever 2113 is connected to the first outer ring 2111. The inner side of the second cantilever 2123 is connected to the second inner ring 2122, and the outer side of the second cantilever 2123 is connected to the second outer ring 2121. The outer sides of the first cantilever 2113 and the second cantilever 2123 are fixed parts, and the inner sides are movable parts. The first cantilever 2113 and the second cantilever 2123 drive the second diffuser 22 between the first inner ring 2112 and the second inner ring 2122 to vibrate.

[0059] Optionally, the first cantilever 2113 and the second cantilever 2123 can also adopt one of the following structures: strip structure, U-shaped structure or L-shaped structure. The number of strip structure, U-shaped structure or L-shaped structure is determined according to the number of the first inner ring, the first outer ring, the second inner ring and the second outer ring. As long as it can drive the second diffuser 22 between the first inner ring 2112 and the second inner ring 2122 to vibrate, no further restrictions are imposed on the first cantilever 2113 and the second cantilever 2123 here.

[0060] As shown in Figures 2 and 3, in some embodiments, the elastic component 21 further includes a connector 213 located between the first cantilever 2113 and the second cantilever 2123. One end of the connector 213 is connected to the first cantilever 2113, and the other end is connected to the second cantilever 2123. Specifically, the connector 213 is bonded and fixed to the first cantilever 2113, and the connector 213 is bonded and fixed to the second cantilever 2123.

[0061] In this application, the first cantilever 2113 and the second cantilever 2123 are connected by a connector 213. This ensures that the vibration frequencies of the first cantilever 2113 and the second cantilever 2123 are consistent, making the first cantilever 2113 and the second cantilever 2123 a whole structure. This drives the second diffuser 22 to vibrate stably in the first plane a, so that the elastic component 21 can obtain a stable horizontal motion mode.

[0062] In some embodiments, the first cantilever 2113 includes a first frame 21131 and a first connecting portion 21132. Multiple first frames 21131 are arranged sequentially from the inside out. The first connecting portion 21132 is configured to connect two adjacent first frames 21131. The second cantilever 2123 includes a second frame 21231 and a second connecting portion 21232. Multiple second frames 21231 are arranged sequentially from the inside out. The second connecting portion 21232 is configured to connect two adjacent second frames 21231. One first frame 21131 and one second frame 21231 are arranged opposite each other. Multiple connectors 213 are provided. Some connectors 213 are configured to connect the end corners of the first frame 21131 and the end corners of the second frame 21231. Some connectors 213 are configured to connect the first connecting portion 21132 and the second connecting portion 21232.

[0063] In this application, among the plurality of first frame frames 21131, the innermost first frame frame 21131 is connected to the first inner ring, and among the plurality of first frame frames 21131, the outermost first frame frame 21131 is connected to the first outer ring. Among the plurality of second frame frames 21231, the innermost second frame frame 21231 is connected to the second inner ring, and among the plurality of second frame frames 21231, the inner and outer second frame frames 21231 are connected to the second outer ring. The corners of the first frame frame 21131 and the second frame frame 21231 are connected by a plurality of connectors, and the first connecting part 21132 and the second connecting part 21232 are connected by a plurality of connectors, thereby ensuring the stability of the structure of the first cantilever 2113 and the second cantilever 2123, and further improving the consistency of the vibration frequency of the first cantilever 2113 and the second cantilever 2123.

[0064] Specifically, as shown in Figures 4 and 5, the first spring 211 and the second spring 212 have the same structure. The first inner ring 2112 is disposed inside the first outer ring 2111, and the first inner ring 2112 and the first outer ring 2111 are located in the same plane. The second inner ring 2122 is disposed inside the second outer ring 2121, and the second inner ring 2122 and the second outer ring 2121 are located in the same plane. Three first frame borders 21131 are provided, including: the innermost first frame border 21131, the middle first frame border 21131, and the outermost first frame border 21131. The first inner ring is disposed inside the innermost first frame border 21131. The two ends of the outer side of the first inner ring along the first direction X are connected one-to-one with the two ends of the inner side of the innermost first frame border 21131 along the first direction X. The innermost first frame border 21131 is located inside the middle first frame border 21131. The two ends of the outer side of the innermost first frame border 21131 along the second direction Y are connected to the middle first frame border 21131. The inner sides of the first frame 21131 are connected one-to-one with the two ends of the second direction Y. The middle first frame 21131 is located inside the outermost first frame 21131. The outer sides of the middle first frame 21131 along the first direction X are connected one-to-one with the inner sides of the outermost first frame 21131 along the first direction X. The outermost first frame 21131 is located inside the first outer ring. The outer sides of the outermost first frame 21131 along the second direction Y are connected one-to-one with the inner sides of the first outer ring along the second direction Y. The second frame 21231 has three parts: the innermost second frame 21231, the middle second frame 21231, and the outermost second frame 21231. The second inner ring is located inside the innermost second frame 21231. The two ends of the outer side of the second inner ring along the first direction X are connected one-to-one with the two ends of the inner side of the innermost second frame 21231 along the first direction X. The innermost second frame 21231 is located inside the middle second frame 21231. The two ends of the outer side of the innermost second frame 21231 along the second direction Y are connected to the middle second frame 21231. The inner ends of the second frame 21231 along the second direction Y are connected one-to-one. The middle second frame 21231 is located inside the outermost second frame 21231. The outer ends of the middle second frame 21231 along the first direction X are connected one-to-one with the inner ends of the outermost second frame 21231 along the first direction X. The outermost second frame 21231 is located inside the second outer ring. The outer ends of the outermost second frame 21231 along the second direction Y are connected one-to-one with the inner ends of the second outer ring along the second direction Y. The first direction X is parallel to the second direction Y, which ensures that the first cantilever 2113 and the second cantilever 2123 are subjected to balanced forces in the plane, further ensuring the stability of the vibration of the second diffuser 22 driven by the first spring 211 and the second spring 212.

[0065] The first inner ring 2112 is provided with a first adhesive part 2115, and the second inner ring 2122 is provided with a second adhesive part 2125. The second diffuser sheet 22 is fixed by applying adhesive through the first adhesive part 2115 and the second adhesive part 2125.

[0066] Optionally, the first spring piece 211 and the second spring piece 212 can also be connected by glue, that is, the first cantilever 2113 and the second cantilever 2123 can be connected by glue, which can also make the first cantilever 2113 and the second cantilever 2123 a whole structure, thereby driving the second diffuser 22 to vibrate stably in the first plane a.

[0067] As shown in Figures 2, 3, and 6, in some embodiments, a first positioning part 2114 is provided on the first outer ring 2111, a second positioning part 2124 is provided on the second outer ring 2121, and a third positioning part 111 is provided on the substrate 11. The third positioning part 111 is used to position the first positioning part 2114 and the second positioning part 2124.

[0068] In this application, the substrate 11 has a third positioning part 111. The third positioning part 111 positions the first positioning part 2114 and the second positioning part 2124 to ensure the accuracy of the position of the first spring piece 211 and the second spring piece 212, thereby ensuring that the relative positions of the first spring piece 211 and the second spring piece 212 can be kept aligned, and further improving the stability of the elastic component 21 driving the second diffuser 22 to vibrate along the first plane a.

[0069] Specifically, the first positioning part 2114 and the second positioning part 2124 are positioning grooves, and the third positioning part 111 is a positioning post. The positioning post is positioned in the positioning groove to position the first spring piece 211 and the second spring piece 212. The positioning post includes a first positioning boss for positioning the first positioning part 2114 and a second positioning boss for positioning the second positioning part 2124. It can not only position the first spring piece 211 and the second spring piece 212 in the first plane a, but also position the first spring piece 211 and the second spring piece 212 in a direction perpendicular to the first plane a, ensuring that the gap between the first spring piece 211 and the second spring piece 212 is fixed, thereby ensuring that the first spring piece 211 and the second spring piece 212 can remain parallel, thereby improving the stability of the second diffuser plate 22 vibrating in the first plane a.

[0070] As shown in Figures 6 to 11, in some embodiments, the substrate 11 has a first surface 112 and a second surface 113, which are disposed opposite to each other. The mover portion 2 is disposed on the first surface 112 of the substrate 11, and the vibration assembly 12 and the first diffuser 13 are disposed on the second surface 113 of the substrate 11. One side of the outer periphery of the vibration assembly 12 is attached to one side of the outer periphery of the first diffuser 13.

[0071] In this application, the mover portion 2 is disposed on the first surface 112 of the substrate 11, and the vibration component 12 and the first diffuser 13 are disposed on the second surface 113 of the substrate 11. A light-transmitting hole 115 is provided on the substrate 11, and the first diffuser 13 and the second diffuser 22 are respectively located on both sides of the light-transmitting hole 115. This design effectively reduces the overall thickness and minimizes the size of the light-transmitting hole 115 without affecting the laser beam, enabling miniaturization of the laser speckle eliminator. As shown in Figure 11, the vibration component 12 and the first diffuser 13 are edge-fitted on the second surface 113. Both the vibration component 12 and the first diffuser 13 are located on the second surface 113 of the substrate 11 and are edge-fitted, reducing the mounting gap between them and decreasing the overall lateral dimension, thus enabling miniaturization of the laser speckle eliminator.

[0072] Specifically, the vibration assembly 12 includes a vibration motor 121 and a flexible circuit board 122. The vibration motor 121 is fixed to the substrate 11, and the flexible circuit board 122 is fixed to the substrate 11 by fasteners. The flexible circuit board 122 is electrically connected to the vibration motor 121 for the operation of the vibration motor 121. The fasteners can be bolts and pressure plates. The substrate 11 has a groove for positioning the flexible circuit board 122. The pressure plate is fixed to the substrate 11 by bolts and presses the flexible circuit board 122 in the groove to ensure the fixation effect of the flexible circuit board 122 and facilitate subsequent disassembly and maintenance. The substrate 11 has a wire groove, and the flexible circuit board 122 can also be fixed through the wire groove by snapping the flexible circuit board 122 into the wire groove. The flexible circuit board 122 can also be fixed by bonding to the substrate, etc. The fixing method of the flexible circuit board 122 is not limited here.

[0073] As shown in Figures 6 and 7, in some embodiments, a mounting cantilever 114 is provided on the substrate 11. The fixed end 1141 of the mounting cantilever 114 is disposed adjacent to the vibration component 12, or the fixed end 1141 of the mounting cantilever 114 is disposed in contact with the vibration component 12. The free end 1142 of the mounting cantilever 114 is used to connect to an external structure.

[0074] In this application, by setting up a mounting cantilever 114, the fixed end 1141 of the mounting cantilever 114 is adjacent to or attached to the vibration component 12, which facilitates the transmission of vibration, and the free end 1142 is used to connect to the external structure, thereby reducing or avoiding the influence of the external structure on the transmission of vibration.

[0075] Specifically, the free end 1142 of the mounting cantilever 114 is provided with an interface for connecting to an external structure. The interface is provided with a step so that the mounting cantilever 114 is in a free state during vibration and will not affect the transmission of vibration.

[0076] The mounting cantilever 114 in this application is set in an L-shape, which can further reduce the overall volume.

[0077] The laser speckle eliminater generates vibration through the vibration component 12, and drives the elastic component 21 and the second diffuser 22 to vibrate through the resonance principle, so that the second diffuser 22 and the first diffuser 13 generate relative motion, thereby reducing or eliminating laser speckle. It does not require an electromagnetic system, reduces the number of parts, and has a simple structure.

[0078] This application provides a projection device, including: a laser source for generating an incident beam; and the aforementioned laser speckle eliminator disposed in the optical path of the laser source.

[0079] In this application, a laser speckle eliminator is disposed in the optical path of the laser source. The incident beam generated by the laser source passes through the first diffuser 13 and the second diffuser 22, and relative motion is generated between the first diffuser 13 and the second diffuser 22, thereby reducing or eliminating laser speckle. Using the laser speckle eliminator of this application can reduce its size, facilitating the miniaturization of projection equipment.

[0080] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0081] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0082] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0083] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0084] 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A laser speckle eliminator, characterized in that, include: The stator portion includes a substrate; A vibration assembly disposed on the substrate; A first diffusion sheet is disposed on the substrate; The moving part includes an elastic component connected to the substrate; A second diffuser sheet is disposed on the elastic component, and the second diffuser sheet is disposed opposite to the first diffuser sheet. When the vibration component vibrates, the elastic component drives the second diffuser to vibrate through resonance, and the second diffuser is configured to move relative to the first diffuser.

2. The laser speckle eliminator according to claim 1, characterized in that, The elastic component has a first plane, the first diffuser is parallel to the first plane, the second diffuser is parallel to the first plane, the vibration component vibrates along the first plane, and the elastic component is configured to drive the second diffuser to vibrate along the first plane.

3. The laser speckle eliminator according to claim 2, characterized in that, The elastic component is configured to drive the second diffuser to vibrate, and the natural frequency of the second diffuser vibration is equal to the vibration frequency of the vibration component.

4. The laser speckle eliminator according to claim 1, characterized in that, The elastic component has a double-layer elastic structure, which is configured to mount the second diffuser sheet.

5. The laser speckle eliminator according to claim 4, characterized in that, The elastic component includes a first spring sheet and a second spring sheet, with the second diffuser sheet sandwiched between the first spring sheet and the second spring sheet.

6. The laser speckle eliminator according to claim 5, characterized in that, The first spring includes a first outer ring, a first inner ring, and a first cantilever, the first cantilever being configured to connect the first outer ring and the first inner ring, the first outer ring being connected to the substrate; The second spring includes a second outer ring, a second inner ring, and a second cantilever, the second cantilever being configured to connect the second outer ring and the second inner ring, the second outer ring being connected to the substrate; The second diffuser is sandwiched between the first inner ring and the second inner ring; The first cantilever and the second cantilever are at least one of the following: frame structure, strip structure, U-shaped structure, and L-shaped structure.

7. The laser speckle eliminator according to claim 6, characterized in that, The elastic component further includes a connector located between the first cantilever and the second cantilever, with one end of the connector connected to the first cantilever and the other end of the connector connected to the second cantilever.

8. The laser speckle eliminator according to claim 7, characterized in that, The first cantilever includes a first frame and a first connecting portion. Multiple first frames are arranged sequentially from the inside out. The first connecting portion is configured to connect two adjacent first frames. The second cantilever includes a second frame and a second connecting portion. Multiple second frames are arranged sequentially from the inside out. The second connecting portion is configured to connect two adjacent second frames. One first frame and one second frame are arranged in a one-to-one correspondence. Multiple connectors are provided. Some connectors are configured to connect the end corners of the first frame and the end corners of the second frame, and some connectors are configured to connect the first connecting portion and the second connecting portion.

9. The laser speckle eliminator according to claim 6, characterized in that, The first outer ring is provided with a first positioning part, the second outer ring is provided with a second positioning part, and the substrate is provided with a third positioning part, which is configured to position the first positioning part and the second positioning part.

10. The laser speckle eliminator according to claim 1, characterized in that, The substrate has a first surface and a second surface, which are disposed opposite to each other. The moving part is disposed on the first surface of the substrate, the vibration assembly is disposed on the second surface of the substrate, the first diffuser is disposed on the second surface of the substrate, and one side of the outer periphery of the vibration assembly is attached to one side of the outer periphery of the first diffuser.

11. The laser speckle eliminator according to claim 1 or 10, characterized in that, The substrate is provided with a mounting cantilever, the fixed end of the mounting cantilever is disposed adjacent to the vibration component, or the fixed end of the mounting cantilever is disposed in contact with the vibration component, and the free end of the mounting cantilever is configured to connect to an external structure.

12. A projection device, characterized in that, include: A laser source used to generate an incident beam; and The laser speckle eliminater as described in any one of claims 1-11 is disposed in the optical path of the laser source.

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