Laser speckle eliminator and projection equipment

Abstract

The utility model relates to the technical field of projection display, in particular to a laser speckle eliminator and projection equipment, the laser speckle eliminator comprises a stator part and a rotor part, the stator part comprises a substrate, and a vibration assembly and a first diffusion sheet which are arranged on the substrate; the mover part comprises an elastic assembly connected with the substrate and a second diffusion sheet arranged on the elastic assembly, and the second diffusion sheet and the first diffusion sheet are oppositely arranged; when the vibration assembly vibrates, the elastic assembly drives the second diffusion sheet to vibrate through resonance so that the second diffusion sheet can move relative to the first diffusion sheet, and the laser speckle eliminator does not need an electromagnetic system, reduces parts and is simple in structure.

Description

Technical Field

[0001] The present application relates to the field of projection display technology, and in particular to a laser speckle eliminator and a projection device. Background Art

[0002] Laser Speckle Reduction (LSR) devices are used to eliminate laser speckle. Currently, LSR devices eliminate laser speckle by vibrating a voice coil motor horizontally, driving a diffuser to vibrate in the same manner. Achieving horizontal vibration requires a combination of an electromagnetic system and a spring system, as well as supporting structures. This results in a complex design with numerous components. Utility Model Content

[0003] The purpose of the present application is to provide a laser speckle eliminator and a projection device, wherein the laser speckle eliminator does not require an electromagnetic system, reduces components, and has a simple structure.

[0004] To this end, in a first aspect, an embodiment of the present application provides a laser speckle eliminator, comprising: a stator portion, the stator portion comprising a substrate, a vibration component disposed on the substrate, and a first diffuser; and a mover portion, comprising an elastic component connected to the substrate and a second diffuser disposed on the elastic component, the second diffuser being disposed opposite to the first diffuser; wherein, when the vibration component vibrates, the elastic component drives the second diffuser to vibrate through resonance, so that the second diffuser moves relative to the first diffuser.

[0005] In a possible implementation, the elastic component has a first plane, the first diffuser and the second diffuser are respectively parallel to the first plane, the vibration component vibrates along the first plane, and the elastic component drives the second diffuser to vibrate along the first plane.

[0006] In a possible implementation, the natural frequency of the second diffuser driven by the elastic component to vibrate is equal to the vibration frequency of the vibration component.

[0007] In a possible implementation, the elastic component includes a first elastic sheet and a second elastic sheet, and the second diffusion sheet is sandwiched between the first elastic sheet and the second elastic sheet.

[0008] In one possible implementation, the first spring piece includes a first outer ring, a first inner ring, and a first cantilever connecting the first outer ring and the first inner ring, and the first outer ring is connected to the substrate; the second spring piece includes a second outer ring, a second inner ring, and a second cantilever connecting the second outer ring and the second inner ring, and the second outer ring is connected to the substrate; the second diffusion sheet is clamped between the first inner ring and the second inner ring; the first cantilever and the second cantilever are at least one of a frame-type structure, a strip structure, a U-type structure, and an L-type structure.

[0009] In a possible implementation, the elastic component further includes a connecting member, which is located between the first cantilever and the second cantilever, and two ends of the connecting member are respectively connected to the first cantilever and the second cantilever.

[0010] In one possible implementation, the first cantilever includes a plurality of first frames arranged sequentially from the inside to the outside and a first connecting portion connecting two adjacent first frames, the second cantilever includes a second frame arranged sequentially from the inside to the outside and a second connecting portion connecting two adjacent second frames, and the plurality of first frames are respectively arranged opposite to the plurality of second frames; a plurality of connecting members are provided, some of the connecting members are used to connect the end corners of the first frame and the end corners of the second frame, and some of the connecting members are used to connect the first connecting portion and the second connecting portion.

[0011] In a possible implementation, a first positioning portion is provided on the first outer ring, a second positioning portion is provided on the second outer ring, and a third positioning portion is provided on the substrate. The third positioning portion is used to position the first positioning portion and the second positioning portion.

[0012] In one possible implementation, the substrate has a first surface and a second surface that are arranged opposite to each other, the movable part is arranged on the first surface of the substrate, the vibration component and the first diffuser are arranged on the second surface of the substrate, and one side of the periphery of the vibration component is in contact with one side of the periphery of the first diffuser.

[0013] In a possible implementation, a mounting cantilever is provided on the substrate, a fixed end of the mounting cantilever is adjacent to or in contact with the vibration component, and a free end of the mounting cantilever is used to connect to an external structure.

[0014] In a second aspect, an embodiment of the present application provides a projection device, comprising: a light source for generating an incident light beam; and the above-mentioned laser speckle eliminator, disposed on an optical path of the light source.

[0015] According to the laser speckle eliminator and projection device provided in the embodiments of the present application, the laser speckle eliminator generates vibrations through a vibration component, and drives the elastic component and the second diffuser to vibrate through the principle of resonance, so that relative motion is generated between the second diffuser and the first diffuser, thereby achieving the effect of reducing or eliminating laser speckle. This eliminates the need for an electromagnetic system, reduces components, and simplifies the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0019] Figure 1 A schematic diagram of an exploded structure of a laser speckle eliminator provided in an embodiment of the present application is shown;

[0020] Figure 2 A schematic diagram showing the three-dimensional structure of a mover part provided in an embodiment of the present application is shown;

[0021] Figure 3 A schematic diagram of an exploded structure of a mover part provided in an embodiment of the present application is shown;

[0022] Figure 4 A schematic diagram showing the three-dimensional structure of a first elastic piece provided in an embodiment of the present application is shown;

[0023] Figure 5 A schematic diagram showing the three-dimensional structure of a second elastic piece provided in an embodiment of the present application is shown;

[0024] Figure 6 A schematic diagram of the three-dimensional structure of a substrate provided in an embodiment of the present application is shown;

[0025] Figure 7 A schematic structural diagram showing another angle of view of a substrate provided in an embodiment of the present application is shown;

[0026] Figure 8 A schematic diagram of an exploded structure of a mover part and a base plate provided in an embodiment of the present application is shown;

[0027] Figure 9 A schematic diagram of the three-dimensional structure of a mover part and a substrate provided in an embodiment of the present application is shown;

[0028] Figure 10 A schematic diagram of an exploded structure of a vibration assembly, a first diffuser, and a substrate provided in an embodiment of the present application is shown;

[0029] Figure 11 A schematic diagram of the three-dimensional structure of a vibration component, a first diffuser and a substrate provided in an embodiment of the present application is shown.

[0030] Description of reference numerals:

[0031] a, first plane; X, first direction; Y, second direction;

[0032] 1. Stator; 11. Substrate; 111. Third positioning portion; 112. First surface; 113. Second surface; 114. Mounting cantilever; 1141. Fixed end; 1142. Free end; 115. Light hole; 12. Vibration assembly; 121. Vibration motor; 122. Flexible circuit board; 13. First diffuser;

[0033] 2. Mover 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 portion; 2114. First positioning portion; 2115. First adhesive portion; 212. Second spring piece; 2121. Second outer ring; 2122. Second inner ring; 2123. Second cantilever; 21231. Second frame; 21232. Second connecting portion; 2124. Second positioning portion; 2125. Second adhesive portion; 213. Connector; 22. Second diffuser. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] The disclosure below provides many different embodiments or examples for implementing different structures of the embodiments of the present application. In order to simplify the disclosure of the embodiments of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the embodiments of the present application. In addition, the embodiments of the present application may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0036] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," "front," "back," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a positional flip or a change in posture or a change in motion, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will subsequently be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly.

[0037] In order to solve the problems in the prior art, the present application provides a laser speckle eliminator, which does not require an electromagnetic system, reduces components, and has a simple structure.

[0038] like Figure 1-11 As shown, an embodiment of the present application provides a laser speckle eliminator, including a stator part 1 and a mover part 2.

[0039] The stator portion 1 includes a substrate 11 , and a vibration assembly 12 and a first diffusion sheet 13 disposed on the substrate 11 .

[0040] The movable part 2 includes an elastic component 21 connected to the substrate 11 and a second diffuser 22 arranged on the elastic component 21. The second diffuser 22 is arranged 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, so that the second diffuser 22 moves relative to the first diffuser 13.

[0041] In the present 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, so that relative movement is generated between the second diffuser 22 and the first diffuser 13, thereby reducing or eliminating the laser speckle. There is no need to set up an electromagnetic system, the number of components is reduced, and the structure is simple.

[0042] In related technologies, laser speckle removal generally includes:

[0043] Diffuser wheel method: A transfer motor drives a diffuser in high-speed rotation. Laser light passes through the diffuser, generating beams at varying angles. The superposition of these beams creates a speckle-reducing visual effect. However, the transfer motor itself cannot be made very small and is expensive. High-speed transfer can cause friction and debris, which can easily jam the rotor and burn out the motor. The larger the diffuser, the higher the cost.

[0044] Laser speckle eliminator: This eliminates laser speckle by vibrating a voice coil motor horizontally, driving the diffuser to vibrate in the same manner. Achieving horizontal vibration requires a combination of an electromagnetic system and a spring system, as well as supporting structures. This results in a complex structure with many components and a complex assembly process.

[0045] Deformable mirrors utilize a microscopically deformable mirror to reflect the laser beam, shifting the beam's phase to eliminate speckle. Each microscopic element on the mirror deforms using piezoelectric principles. This results in extremely high material and production costs, making it suitable only for high-end optical equipment and prohibitive for ordinary projectors.

[0046] The laser speckle eliminator provided in the embodiments of the present application utilizes the principle of resonance to transmit the vibration of the vibrating assembly 12 to the elastic assembly 21, which then causes the elastic assembly 21 to vibrate the second diffuser 22 at the same frequency. This generates relative motion between the first diffuser 13 and the second diffuser 22, thereby reducing or eliminating laser speckle. By eliminating the electromagnetic system, the structure is simplified, and assembly and production are even easier. Furthermore, the omission of some components allows for a smaller size and lower costs.

[0047] like Figure 3 As shown, in some embodiments, the elastic component 21 has a first plane a, which is one of two oppositely disposed surfaces of the elastic component 21; or the first plane a is parallel to both surfaces of the elastic component 21, and the distances from the first plane a to the two surfaces are equal. The first diffuser 13 and the second diffuser 22 are respectively 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 component 12 vibrates along the first plane a when the vibration direction of the vibration component 12 is perpendicular to the perpendicular to the first plane a, and can be any direction along the first plane a. Driven by the vibration component 12, the elastic component 21 drives the second diffuser 22 to vibrate along the first plane a through resonance.

[0048] In the present 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 and 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 of the first plane a, thereby reducing or eliminating the laser speckle, thereby ensuring the effect of eliminating the laser speckle.

[0049] In some embodiments, the natural frequency of the second diffusion sheet 22 driven by the elastic component 21 to vibrate is equal to the vibration frequency of the vibration component 12 .

[0050] In this application, the natural frequency of vibration 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 energy required is minimal. In other words, only a small amount of vibration energy from the vibration component 12 is required 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 can save energy at the same vibration frequency.

[0051] like Figure 2-3 As shown, in some embodiments, the elastic component 21 includes a first elastic piece 211 and a second elastic piece 212 , and the second diffusion sheet 22 is sandwiched between the first elastic piece 211 and the second elastic piece 212 .

[0052] In the present application, the second diffuser 22 is sandwiched between the first elastic sheet 211 and the second elastic sheet 212 , thereby ensuring that the second diffuser 22 vibrates along the first plane a, thereby ensuring the stability of the vibration of the second diffuser 22 .

[0053] Specifically, the second diffusion sheet 22 is fixed to the first elastic sheet 211 and the second elastic sheet 212 by glue, so as to ensure the firmness of the installation of the second diffusion sheet 22 .

[0054] like Figure 4-5 As shown, in some embodiments, the first spring piece 211 includes a first outer ring 2111, a first inner ring 2112 and a first cantilever 2113 connecting the first outer ring 2111 and the first inner ring 2112, and 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 connecting the second outer ring 2121 and the second inner ring 2122, and the second outer ring 2121 is connected to the substrate 11; the second diffuser 22 is clamped between the first inner ring 2112 and the second inner ring 2122; the first cantilever 2113 and the second cantilever 2123 are respectively at least one of a frame-type structure, a bar structure, a U-type structure, and an L-type structure.

[0055] In the present application, the first outer ring 2111 of the first elastic piece 211 is connected to the substrate 11, and the second outer ring 2121 of the second elastic piece 212 is connected to the substrate 11. The first cantilever 2113 allows the first inner ring 2112 to vibrate along the first plane a relative to the first outer ring 2111, and the second cantilever 2123 allows the second inner ring 2122 to vibrate along the first plane a relative to the second outer ring 2121. 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.

[0056] Specifically, the first cantilever 2113 and the second cantilever 2123 each have a frame-shaped structure. 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 and second cantilever 2113 and 2123 are fixed, while the inner sides are movable. The first and second cantilever 2113 and 2123 drive the vibration of the second diffuser 22 between the first and second inner rings 2112 and 2122.

[0057] Optionally, the first cantilever 2113 and the second cantilever 2123 can also adopt a bar structure, a U-shaped structure, an L-shaped structure, etc. The number of the bar structure, the U-shaped structure, and the 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 diffusion plate 22 between the first inner ring 2112 and the second inner ring 2122 to vibrate, there is no excessive restriction on the first cantilever 2113 and the second cantilever 2123 here.

[0058] like Figure 2-3 As shown, in some embodiments, the elastic component 21 further includes a connecting member 213, which is located between the first cantilever 2113 and the second cantilever 2123, and the two ends of the connecting member 213 are respectively connected to the first cantilever 2113 and the second cantilever 2123. Specifically, the connecting member 213 is bonded and fixed to the first cantilever 2113 and the second cantilever 2123.

[0059] In the present application, after the first cantilever 2113 and the second cantilever 2123 are connected by the connecting member 213, the vibration frequency of the first cantilever 2113 and the second cantilever 2123 can be kept consistent, so that the first cantilever 2113 and the second cantilever 2123 become an integral structure, thereby driving 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.

[0060] In some embodiments, the first cantilever 2113 includes a plurality of first frames 21131 arranged in sequence from the inside to the outside and a first connecting portion 21132 connecting two adjacent first frames 21131. The second cantilever 2123 includes a second frame 21231 arranged in sequence from the inside to the outside and a second connecting portion 21232 connecting two adjacent second frames 21231. The plurality of first frames 21131 are respectively arranged opposite to the plurality of second frames 21231. There are a plurality of connecting members 213, and some of the connecting members 213 are used to connect the end corners of the first frame 21131 and the end corners of the second frame 21231. Some of the connecting members 213 are used to connect the first connecting portion 21132 and the second connecting portion 21232.

[0061] In the present application, the innermost first frame 21131 among the multiple first frames 21131 is connected to the first inner circle, the outermost first frame 21131 among the multiple first frames 21131 is connected to the first outer circle, the innermost second frame 21231 among the multiple second frames 21231 is connected to the second inner circle, and the inner and outer second frames 21231 among the multiple second frames 21231 are connected to the second outer circle. The end corners of the first frame 21131 and the second frame 21231 are connected by multiple connecting members, and the first connecting part 21132 and the second connecting part 21232 are connected by multiple connecting members, thereby ensuring the stability of the structure of the first cantilever 2113 and the second cantilever 2123 themselves, and further improving the consistency of the vibration frequency of the first cantilever 2113 and the second cantilever 2123.

[0062] Specifically, such as Figure 4-5As shown, the first elastic member 211 and the second elastic member 212 have the same structure. The first inner ring 2112 is arranged inside the first outer ring 2111. The first inner ring 2112 and the first outer ring 2111 are located in the same plane. The second inner ring 2122 is arranged inside the second outer ring 2121. The second inner ring 2122 and the second outer ring 2121 are located in the same plane. The first frame 21131 is provided with three, namely the innermost first frame 21131, the middle first frame 21131 and the outermost first frame 21131. The first inner ring is arranged inside the innermost first frame 21131. The outer ends of the first inner ring along the first direction X are respectively connected to the inner ends of the innermost first frame 21131 along the first direction X. The innermost first frame 21131 is located inside the middle first frame 21131. The outer ends of the innermost first frame 21131 along the second direction Y are respectively connected. They are respectively connected to the two ends of the inner side of the middle first frame 21131 along the second direction Y, the middle first frame 21131 is located on the inner side of the outermost first frame 21131, and the two ends of the outer side of the middle first frame 21131 along the first direction X are respectively connected to the two ends of the inner side of the outermost first frame 21131 along the first direction X, the outermost first frame 21131 is located in the first outer circle, and the two ends of the outer side of the outermost first frame 21131 along the second direction Y are respectively connected to the two ends of the inner side of the first outer circle along the second direction Y. The second frame 21231 is provided with three, namely the innermost second frame 21231, the middle second frame 21231 and the outermost second frame 21231, the second inner circle is provided in the innermost second frame 21231, and the two ends of the outer side of the second inner circle along the first direction X are respectively connected to 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 in the middle second frame 21231, and the two ends of the outer side of the innermost second frame 21231 along the second direction Y are respectively connected to the two ends of the inner side of the innermost second frame 21231 along the second direction Y. The first and second cantilevers 2113 and 2123 are respectively connected to the two ends of the inner side of the middle second frame 21231 along the second direction Y. The middle second frame 21231 is located on the inner side of the outermost second frame 21231. The two ends of the outer side of the middle second frame 21231 along the first direction X are respectively connected to the two ends of the inner side of the outermost second frame 21231 along the first direction X. The outermost second frame 21231 is located within the second outer ring. The two ends of the outer side of the outermost second frame 21231 along the second direction Y are respectively connected to the two ends of the inner side of the second outer ring along the second direction Y. The first direction X is parallel to the second direction Y, which can ensure that the first cantilever 2113 and the second cantilever 2123 are subjected to balanced forces within the plane, further ensuring the stability of the vibration of the second diffuser 22 driven by the first and second elastic members 211 and 212.

[0063] The first inner ring 2112 is provided with a first adhesive portion 2115 , and the second inner ring 2122 is provided with a second adhesive portion 2125 . The second diffusion sheet 22 is fixed by applying adhesives on the first adhesive portion 2115 and the second adhesive portion 2125 .

[0064] 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, so that the first cantilever 2113 and the second cantilever 2123 can become an integral structure, thereby driving the second diffuser 22 to vibrate stably in the first plane a.

[0065] like Figure 2 、 3 As shown in , 6, in some embodiments, a first positioning portion 2114 is provided on the first outer ring 2111, a second positioning portion 2124 is provided on the second outer ring 2121, and a third positioning portion 111 is provided on the substrate 11, and the third positioning portion 111 is used to position the first positioning portion 2114 and the second positioning portion 2124.

[0066] In the present application, the first positioning portion 2114 and the second positioning portion 2124 are positioned by the third positioning portion 111 on the substrate 11 to ensure the accuracy of the positions 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, further improving the stability of the elastic component 21 driving the second diffuser 22 to vibrate along the first plane a.

[0067] Specifically, the first positioning portion 2114 and the second positioning portion 2124 are positioning grooves, and the third positioning portion 111 is a positioning column. The positioning column is positioned in the positioning groove to position the first spring piece 211 and the second spring piece 212. The positioning column includes a first positioning boss for positioning the first positioning portion 2114 and a second positioning boss for positioning the second positioning portion 2124. This not only positions the first spring piece 211 and the second spring piece 212 within the first plane a, but also positions 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 vibration stability of the second diffuser 22 in the first plane a.

[0068] like Figure 6-11 As shown, in some embodiments, the substrate 11 has a first surface 112 and a second surface 113 arranged opposite to each other, the movable part 2 is arranged on the first surface 112 of the substrate 11, the vibration component 12 and the first diffuser 13 are arranged on the second surface 113 of the substrate 11, and one side of the periphery of the vibration component 12 is in contact with one side of the periphery of the first diffuser 13.

[0069] In the present application, the mover portion 2 is disposed on the first surface 112 of the substrate 11, the vibration assembly 12 and the first diffuser 13 are disposed on the second surface 113 of the substrate 11, and a light hole 115 is provided on the substrate 11. The first diffuser 13 and the second diffuser 22 are respectively located on either side of the light hole 115. The above design can effectively reduce the overall thickness and minimize the size of the light hole 115 without affecting the laser beam, thereby miniaturizing the laser speckle eliminator. Figure 11 As shown, the vibration component 12 and the first diffuser 13 are bonded together on the second surface 113 by the edges. Both the vibration component 12 and the first diffuser 13 are located on the second surface 113 of the substrate 11, and the edges are bonded together, which reduces the installation gap between the two and can reduce the overall lateral size, so that the laser speckle eliminator can be miniaturized.

[0070] Specifically, the vibration component 12 includes a vibration motor 121 and a flexible circuit board 122. The vibration motor 121 is fixed on the substrate 11, and the flexible circuit board 122 is fixed on 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 a pressure plate. A groove for positioning the flexible circuit board 122 is provided on the substrate 11. The pressure plate is fixed to the substrate 11 by bolts. The pressure plate presses and fixes the flexible circuit board 122 in the groove to ensure the fixing effect of the flexible circuit board 122 and facilitate subsequent disassembly and maintenance; the flexible circuit board 122 can also be fixed through the wire groove on the substrate 11, and the flexible circuit board 122 can be plugged into the wire groove; the flexible circuit board 122 can also be bonded and fixed to the substrate, etc., and there is no restriction on the fixing method of the flexible circuit board 122 here.

[0071] like Figure 6-7 As shown, in some embodiments, a mounting cantilever 114 is provided on the substrate 11 , a fixed end 1141 of the mounting cantilever 114 is adjacent to or in contact with the vibration assembly 12 , and a free end 1142 of the mounting cantilever 114 is used to connect to an external structure.

[0072] In the present application, a mounting cantilever 114 is provided, and the fixed end 1141 of the mounting cantilever 114 is adjacent to or in contact with the vibration component 12 to facilitate the conduction of vibration, and the free end 1142 is used to connect to an external structure to reduce or avoid the influence of the external structure on the conduction of vibration.

[0073] Specifically, the free end 1142 of the mounting cantilever 114 is provided with an interface, which is used to connect to an external structure. The interface is provided with a step, so that the mounting cantilever 114 is in a free state during the vibration process and will not affect the conduction of vibration.

[0074] The mounting cantilever 114 in the present application is configured in an L-shape, which can further reduce the overall volume.

[0075] The laser speckle eliminator generates vibrations through the vibration component 12, and drives the elastic component 21 and the second diffuser 22 to vibrate through the principle of resonance, so that relative movement is generated between the second diffuser 22 and the first diffuser 13, thereby achieving the effect of reducing or eliminating laser speckle. No electromagnetic system is required, the number of components is reduced, and the structure is simple.

[0076] An embodiment of the present application provides a projection device, comprising: a light source for generating an incident light beam; and the above-mentioned laser speckle eliminator, disposed on an optical path of the light source.

[0077] In this application, a laser speckle eliminator is placed in the optical path of the light source. The incident light beam generated by the light source passes through the first diffuser 13 and the second diffuser 22. The relative motion between the first diffuser 13 and the second diffuser 22 reduces or eliminates laser speckle. Using the laser speckle eliminator in this application can reduce the size of the projection device, facilitating miniaturization of the projection device.

[0078] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0079] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0080] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A laser speckle eliminator, characterized in that: include: A stator part (1), the stator part (1) comprising a substrate (11), a vibration component (12) and a first diffusion sheet (13) arranged on the substrate (11); and The movable part (2) comprises an elastic component (21) connected to the substrate (11) and a second diffusion sheet (22) arranged on the elastic component (21), wherein the second diffusion sheet (22) is arranged opposite to the first diffusion sheet (13); When the vibration component (12) vibrates, the elastic component (21) drives the second diffusion sheet (22) to vibrate through resonance, so that the second diffusion sheet (22) moves relative to the first diffusion sheet (13).

2. The laser speckle eliminator according to claim 1, wherein: The elastic component has a first plane, the first diffuser (13) and the second diffuser (22) are respectively parallel to the first plane, the vibration component (12) vibrates along the first plane, and the elastic component (21) drives the second diffuser (22) to vibrate along the first plane.

3. The laser speckle eliminator according to claim 2, wherein: The natural frequency at which the elastic component (21) drives the second diffuser (22) to vibrate is equal to the vibration frequency of the vibration component (12).

4. The laser speckle eliminator according to claim 1, wherein: The elastic component (21) comprises a first elastic sheet (211) and a second elastic sheet (212), and the second diffusion sheet (22) is sandwiched between the first elastic sheet (211) and the second elastic sheet (212).

5. The laser speckle eliminator according to claim 4, characterized in that: The first elastic piece (211) comprises a first outer ring (2111), a first inner ring (2112), and a first cantilever (2113) connecting the first outer ring (2111) and the first inner ring (2112), and the first outer ring (2111) is connected to the substrate (11); The second elastic piece (212) comprises a second outer ring (2121), a second inner ring (2122), and a second cantilever (2123) connecting the second outer ring (2121) and the second inner ring (2122), and the second outer ring (2121) is connected to the substrate (11); The second diffusion sheet (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-type structure, a bar-type structure, a U-type structure, and an L-type structure.

6. The laser speckle eliminator according to claim 5, characterized in that: The elastic component (21) further comprises a connecting member (213), wherein the connecting member (213) is located between the first cantilever (2113) and the second cantilever (2123), and the two ends of the connecting member (213) are respectively connected to the first cantilever (2113) and the second cantilever (2123).

7. The laser speckle eliminator according to claim 6, characterized in that: The first cantilever (2113) comprises a plurality of first frames (21131) sequentially arranged from the inside to the outside and a first connecting portion (21132) connecting two adjacent first frames (21131); the second cantilever (2123) comprises a second frame (21231) sequentially arranged from the inside to the outside and a second connecting portion (21232) connecting two adjacent second frames (21231); the plurality of first frames (21131) are respectively arranged opposite to the plurality of second frames (21231); There are multiple connecting members (213), some of which are used to connect the end corners of the first frame (21131) and the end corners of the second frame (21231), and some of which are used to connect the first connecting part (21132) and the second connecting part (21232).

8. The laser speckle eliminator according to claim 5, characterized in that: A first positioning portion (2114) is provided on the first outer ring (2111), a second positioning portion (2124) is provided on the second outer ring (2121), and a third positioning portion (111) is provided on the substrate (11), and the third positioning portion (111) is used to position the first positioning portion (2114) and the second positioning portion (2124).

9. The laser speckle eliminator according to claim 1, wherein: The substrate (11) has a first surface (112) and a second surface (113) arranged opposite to each other; the movable part (2) is arranged on the first surface (112) of the substrate (11); the vibration component (12) and the first diffuser (13) are arranged on the second surface (113) of the substrate (11); and one side of the periphery of the vibration component (12) is in contact with one side of the periphery of the first diffuser (13).

10. The laser speckle eliminator according to claim 1 or 9, characterized in that: A mounting cantilever (114) is provided on the substrate (11), a fixed end (1141) of the mounting cantilever (114) is adjacent to or in contact with the vibration component (12), and a free end (1142) of the mounting cantilever (114) is used for connecting to an external structure.

11. A projection device, characterized in that: include: a light source for generating an incident light beam; as well as The laser speckle eliminator according to any one of claims 1 to 10, arranged in the optical path of the light source.

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