Speckle removing mechanism and projection equipment

Abstract

The invention discloses a speckle removing mechanism and projection equipment, the speckle removing mechanism comprises a support, a lens assembly, a first piezoelectric ceramic vibration assembly and a second piezoelectric ceramic vibration assembly, the support forms an installation space, the lens assembly is suspended in the installation space, and the first piezoelectric ceramic vibration assembly and the second piezoelectric ceramic vibration assembly are arranged in the installation space. The first piezoelectric ceramic vibration assembly is connected with the support and the lens assembly and drives the lens assembly to vibrate in the installation space in the first direction, and the second piezoelectric ceramic vibration assembly is arranged in the lens assembly and drives the lens assembly to vibrate in the installation space in the second direction. And the driving module is used for driving at least part of the lens assembly to vibrate in the mounting space along a second direction, and the first direction and the second direction are arranged in an intersecting manner. According to the technical scheme, speckles generated by projection are eliminated, and meanwhile the size of the projection equipment is reduced.

Description

Technical Field

[0001] This invention relates to the field of electronic equipment technology, and in particular to a speckle removal mechanism and a projection device. Background Technology

[0002] During projector operation, when a laser beam illuminates a non-ideal reflective surface, coherent interference of the light causes speckle, a phenomenon manifested as random bright and dark particles on the projection surface. The presence of speckle degrades image quality and affects imaging performance. Related technologies typically employ a motor-driven diffuser plate to perform high-frequency circular vibrations to address speckle issues during projection. However, due to the inherent characteristics of motors, this speckle removal mechanism suffers from problems such as large size, complex structure, high power consumption, and discontinuous vibration, thus impacting the size of the projection device and the user experience. Summary of the Invention

[0003] The main objective of this invention is to provide a speckle removal mechanism and a projection device, which aims to eliminate speckle generated during projection while reducing the size of the projection device.

[0004] To achieve the above objectives, the present invention proposes a speckle removal mechanism, comprising: A bracket, wherein the bracket forms an installation space; Lens assembly, the lens assembly being suspended within the mounting space; and A first piezoelectric ceramic vibration assembly is connected to the bracket and the lens assembly respectively, and drives the lens assembly to vibrate in a first direction within the installation space; A second piezoelectric ceramic vibration assembly is disposed inside the lens assembly and drives at least a portion of the lens assembly to vibrate in a second direction within the mounting space; The first direction and the second direction are arranged to intersect.

[0005] In one embodiment of the present invention, the first piezoelectric ceramic vibration assembly includes: Two first elastic elements, each having its two ends connected to the bracket and the lens assembly respectively, are respectively disposed on opposite sides of the lens assembly; and A first piezoelectric ceramic sheet is disposed on the surface of one of the first elastic elements. When energized, the first piezoelectric ceramic sheet drives the first elastic element to deform along the first direction, thereby causing the lens assembly to vibrate along the first direction.

[0006] In one embodiment of the present invention, the first elastic member includes a first fixing part, a first deformable part, and a second fixing part that are connected in sequence and arranged at an angle. The first fixing part is fixed to the bracket, the first piezoelectric ceramic sheet is disposed on the first deformable part, and the second fixing part is fixed to the lens assembly.

[0007] In one embodiment of the present invention, the bracket includes a support plate and a connecting plate connected to each other and arranged at an angle, the support plate and the connecting plate enclosing the installation space, the support plate being used to fix the speckle removal mechanism, and the two first elastic members being respectively fixed to both ends of the connecting plate.

[0008] In one embodiment of the present invention, the connecting plate has a limiting groove recessed on its surface facing the installation space, and at least a portion of the first elastic member is inserted into the limiting groove.

[0009] In one embodiment of the present invention, the lens assembly includes: The housing is to which the first piezoelectric ceramic vibration assembly is connected; A lens holder is movably disposed within the housing. A second piezoelectric ceramic vibration assembly is connected to both the housing and the lens holder. The second piezoelectric ceramic vibration assembly drives the lens holder to vibrate relative to the housing in the second direction. A diffusion lens, which is fixed to the lens mount.

[0010] In one embodiment of the present invention, the second piezoelectric ceramic vibration assembly includes: Two second elastic members, each having its two ends connected to the outer casing and the lens mount respectively, are respectively disposed on opposite sides of the lens mount; and The second piezoelectric ceramic sheet is disposed on the surface of one of the two second elastic elements. When energized, the second piezoelectric ceramic sheet drives the second elastic element to deform along the second direction, thereby causing the lens assembly to vibrate along the second direction.

[0011] In one embodiment of the present invention, the second elastic member includes a first connecting portion, a second deformable portion, and a second connecting portion that are sequentially connected and arranged at an angle. The first connecting portion is fixed to the outer shell, the second piezoelectric ceramic sheet is disposed on the second deformable portion, and the second connecting portion is fixed to the lens holder.

[0012] In one embodiment of the present invention, the second connecting portions of the two second elastic members are connected to the lens mount via a connector.

[0013] The present invention also provides a projection device, the projection device including the speckle removal mechanism, the speckle removal mechanism including a bracket, a lens assembly, a first piezoelectric ceramic vibration assembly, and a second piezoelectric ceramic vibration assembly, the bracket forming an installation space, the lens assembly being suspended inside the installation space, the first piezoelectric ceramic vibration assembly being connected to the bracket and the lens assembly respectively, and driving the lens assembly to vibrate in a first direction within the installation space, the second piezoelectric ceramic vibration assembly being disposed inside the lens assembly, and driving at least a portion of the lens assembly to vibrate in a second direction within the installation space, wherein the first direction and the second direction are intersecting.

[0014] In this invention, the bracket provides a mounting carrier for components such as the lens assembly, the first piezoelectric ceramic vibration assembly, and the second piezoelectric ceramic vibration assembly. The first and second piezoelectric ceramic vibration assemblies exert intersecting vibrational forces on the lens assembly in a first and a second direction, respectively. By controlling the amplitude and frequency of the driving voltages of the first and second piezoelectric ceramic vibration assemblies, the vibration amplitude of the first and second piezoelectric ceramic vibration assemblies can be controlled. Through the coupled control of the first and second piezoelectric ceramic vibration assemblies, the lens assembly can exhibit a controllable motion trajectory, thereby effectively scattering the coherent interference of light, eliminating speckle caused by projection, and improving the quality of projection imaging. This invention uses piezoelectric ceramic vibration assemblies instead of motors. Due to their small size and low power consumption, piezoelectric ceramic vibration assemblies can significantly reduce the overall size of the speckle removal mechanism and projection equipment. Furthermore, they eliminate the need for complex transmission structures, reducing design and manufacturing difficulties, minimizing potential failure points, and improving reliability. The high energy conversion efficiency of piezoelectric ceramics significantly reduces power consumption compared to motor drives, contributing to energy conservation, environmental protection, and extended equipment lifespan. Attached Figure Description

[0015] 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, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the speckle removal mechanism of the present invention; Figure 2 This is an exploded view of the speckle removal mechanism of the present invention.

[0017] Explanation of icon numbers:

[0018] 100. Speckle removal mechanism; 10. Bracket; 11. Support plate; 13. Connecting plate; 131. Limiting groove; 20. Lens assembly; 21. Housing; 211. First connecting ear; 213. Second connecting ear; 23. Lens holder; 25. Diffuser; 27. Connector; 40. First piezoelectric ceramic vibration assembly; 41. First elastic element; 411. First fixing part; 413. First deformable part; 415. Second fixing part; 43. First piezoelectric ceramic sheet; 50. Second piezoelectric ceramic vibration assembly; 51. Second elastic element; 511. First connecting part; 513. Second deformable part; 515. Second connecting part; 53. Second piezoelectric ceramic sheet.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0024] During projector operation, when a laser beam illuminates a non-ideal reflective surface, coherent interference of the light causes speckle phenomena. These speckles appear as random bright and dark particles distributed on the projection surface, degrading image quality and affecting imaging performance. Related technologies typically employ a motor-driven diffuser plate to perform high-frequency circular vibrations to address speckle issues during projection. However, due to the inherent characteristics of motors, this speckle removal mechanism suffers from problems such as large size, complex structure, high power consumption, and discontinuous vibration, thus impacting the size of the projection device and the user experience.

[0025] To address the above problems, the present invention proposes a speckle removal mechanism 100.

[0026] Reference Figure 1 and Figure 2 In one embodiment of the present invention, the speckle removal mechanism 100 includes a support 10, a lens assembly 20, a first piezoelectric ceramic vibration component 40, and a second piezoelectric ceramic vibration component 50. The support 10 forms an installation space, and the lens assembly 20 is suspended inside the installation space. The first piezoelectric ceramic vibration component 40 is connected to the support 10 and the lens assembly 20 respectively, and drives the lens assembly 20 to vibrate in a first direction within the installation space. The second piezoelectric ceramic vibration component 50 is disposed inside the lens assembly 20 and drives at least a portion of the lens assembly 20 to vibrate in a second direction within the installation space. The first direction and the second direction are intersecting.

[0027] The bracket 10 can be made of metal to ensure structural strength, or it can be made of plastic to reduce weight and cost while meeting strength requirements. The installation space provides an isolated environment for the lens assembly 20, preventing external interference from affecting vibration stability. This installation space can be a sealed space or a semi-open space, as long as it allows for relative fixation between the lens assembly 20 and the bracket 10. The lens assembly 20 can maintain its relative position to the bracket 10 through a non-rigid connection, such as a spring suspension system or magnetic levitation device, to achieve a suspended state. This avoids the mechanical constraints and energy loss associated with fixed support points, allowing for a freer and smoother vibration process and ensuring vibration continuity.

[0028] The direct connection between the first piezoelectric ceramic vibration component 40 and the bracket 10 and the lens assembly 20 efficiently transmits vibration energy without the need for an intermediate transmission mechanism, which simplifies the overall structure and reduces power consumption. The first piezoelectric ceramic vibration component 40 drives the lens assembly 20 to vibrate linearly along the first direction within the installation space formed by the bracket 10.

[0029] The second piezoelectric ceramic vibration component 50 is directly disposed inside the lens assembly 20. This integrated design brings the driving source closer to the vibrating object, improving response accuracy and efficiency while reducing the space occupied by external components. It also avoids the energy loss and coupling difficulties caused by two vibration sources being connected to the same object simultaneously. The second piezoelectric ceramic vibration component 50 drives at least a portion of the lens assembly 20 to vibrate linearly along the second direction within the installation space. Since the first and second directions intersect, the superposition of the two vibrations forms an elliptical or circular composite motion trajectory, thereby disrupting the coherent interference phenomenon of the laser on the projection surface.

[0030] Understandably, the first and second directions being intersecting means that they are not parallel. The first and second directions can be perpendicular, or the angle between them can be any acute angle less than 90°, such as 45°, 60°, or 80°. To reduce energy loss and improve vibration performance, the angle between the first and second directions is typically 90°. This allows the lens assembly 20 to form a continuous nonlinear trajectory after vibration synthesis. For example, the vibration trajectory can be circular, elliptical, square, triangular, etc., as long as it eliminates speckle caused by projection. The motion trajectory of the lens assembly 20 is not limited here.

[0031] In the technical solution of this invention, the bracket 10 provides a mounting carrier for components such as the lens assembly 20, the first piezoelectric ceramic vibration assembly 40, and the second piezoelectric ceramic vibration assembly 50. The first piezoelectric ceramic vibration assembly 40 and the second piezoelectric ceramic vibration assembly 50 exert intersecting vibration forces on the lens assembly 20 in the first and second directions, respectively. By controlling the amplitude and frequency of the driving voltage of the first piezoelectric ceramic vibration assembly 40 and the second piezoelectric ceramic vibration assembly 50, the vibration amplitude of the first piezoelectric ceramic vibration assembly 40 and the second piezoelectric ceramic vibration assembly 50 can be controlled. Through the coupled control of the first piezoelectric ceramic vibration assembly 40 and the second piezoelectric ceramic vibration assembly 50, the lens assembly 20 can present a controllable motion trajectory, thereby achieving sufficient dispersion of coherent light interference, eliminating speckle generated by projection, and improving the quality of projection imaging. The technical solution of this invention uses a piezoelectric ceramic vibration component to replace the motor. Due to the small size and low power consumption of the piezoelectric ceramic vibration component, the overall size of the speckle removal mechanism 100 and the projection device can be significantly reduced. The direct connection between the first piezoelectric ceramic vibration component 40 and the support 10 and lens assembly 20 efficiently transmits vibration energy without the need for an intermediate transmission mechanism, simplifying the overall structure and reducing power consumption. The first piezoelectric ceramic vibration component 40 is directly located inside the lens assembly 20, which not only makes the structure compact but also brings the drive source closer to the vibrated object, improving response accuracy and efficiency, and reducing the space occupied by external components. By omitting the transmission structure, design and manufacturing difficulty is reduced, failure points are decreased, and reliability is improved. The high energy conversion efficiency of piezoelectric ceramics significantly reduces power consumption compared to motor drives, which is beneficial for energy conservation, environmental protection, and extending equipment battery life.

[0032] Reference Figure 1 and Figure 2 In one embodiment of the present invention, the first piezoelectric ceramic vibration assembly 40 includes: Two first elastic elements 41, with their two ends connected to the bracket 10 and the lens assembly 20 respectively, are respectively disposed on opposite sides of the lens assembly 20; and A first piezoelectric ceramic sheet 43 is disposed on the surface of one of the first elastic elements 41. When energized, the first piezoelectric ceramic sheet 43 drives the first elastic element 41 to deform along the first direction, thereby causing the lens assembly 20 to vibrate along the first direction.

[0033] In one embodiment of the present invention, the first elastic element 41 refers to a structural component capable of elastic deformation to transmit vibration energy. It can be a steel sheet, shape memory alloy strip, flexible metal spring, etc. The purpose of the first elastic element 41 is to drive the lens assembly 20 to move through controllable deformation. In one embodiment, the first elastic element 41 is a steel sheet. The steel sheet can both meet the support requirements of the lens assembly 20 and possess a certain degree of toughness to meet the deformation requirements generated when driven. The first piezoelectric ceramic sheet 43 can directly convert electrical energy into mechanical deformation. The first piezoelectric ceramic sheet 43 is directly disposed on the surface of the first elastic element 41. After being energized, it induces localized directional deformation of the first elastic element 41. This deformation is directly transmitted to the lens assembly 20 through the first elastic element 41, eliminating the need for intermediate transmission links. This achieves efficient conversion of electrical signals into mechanical vibration, thereby driving the lens assembly 20 to vibrate continuously at high frequency along a first direction, effectively replacing the intermittent drive mode of traditional motors and reducing power consumption.

[0034] By setting the two first elastic elements 41 symmetrically arranged on opposite sides of the lens assembly 20, a balanced support structure can be formed to ensure that the driving force is evenly distributed during vibration and to prevent the lens assembly 20 from deflecting or stray vibration.

[0035] Reference Figure 2 In one embodiment of the present invention, the first elastic member 41 includes a first fixing part 411, a first deformable part 413 and a second fixing part 415 connected in sequence and arranged at an angle. The first fixing part 411 is fixed to the bracket 10, the first piezoelectric ceramic sheet 43 is disposed on the first deformable part 413, and the second fixing part 415 is fixed to the lens assembly 20.

[0036] In one embodiment of the present invention, the first fixing part 411 is a rigid region that can form a stable connection structure with the bracket 10. The first fixing part and the bracket 10 can be fixedly connected by welding, with the aim of providing a stable support foundation and reducing energy transfer loss. The first deformable part 413 can be understood as a flexible region specifically designed for controllable deformation. It can be implemented using corrugated metal sheets or polymer elastic materials, or its length can be extended to increase its deformation. The second fixing part 415 is the region that establishes a reliable connection with the lens assembly 20. It can be bonded or welded to achieve the connection with the lens assembly 20. It can be understood that the second fixing part 415 is fixedly connected to the outer surface of the lens assembly 20, specifically to the outer shell 21 in the lens assembly 20. Understandably, the included angle between the first fixing part 411, the first deformable part 413, and the second fixing part 415 is 90°. The first fixing part 411 and the second fixing part 415 are both straight plates. The first deformable part 413 is also roughly plate-shaped. The length of the first deformable part 413 is greater than the length of the first fixing part 411 and the second fixing part 415. In one embodiment, the first deformable part 413 is an L-shaped plate. This allows the first fixing part 411 and the second fixing part 415 to be located on two adjacent side positions of the lens assembly 20, so as to facilitate the fixing of the two first elastic members 41 to the same side of the bracket 10 and simplify the structure.

[0037] Reference Figure 1 and Figure 2 In one embodiment of the present invention, the bracket 10 includes a support plate 11 and a connecting plate 13 connected to each other and arranged at an angle. The support plate 11 and the connecting plate 13 enclose the installation space. The support plate 11 is used to fix the speckle removal mechanism 100. The two first elastic members 41 are respectively fixed to both ends of the connecting plate 13.

[0038] In one embodiment of the present invention, the included angle between the support plate 11 and the connecting plate 13 is 90°. The support plate 11 provides a stable support structure for the entire bracket 10, ensuring that the entire speckle removal mechanism 100 remains in a fixed position during operation and effectively preventing equipment displacement. Both the connecting plate 13 and the connecting plate 14 are flat and integrally formed into an L-shaped rigid frame, thereby avoiding vibration distortion caused by the twisting of the bracket 10. The connecting plate 13 and the connecting plate 14 enclose a semi-enclosed installation space. The support plate 11 serves as a fixed base to securely install the entire mechanism onto an external carrier. The support plate 11 is fixed to the projection equipment by threads. Two first elastic elements 41 are welded or bonded to both ends of the connecting plate 13 along its length, so that the two first elastic elements 41 form a symmetrical force-bearing layout. In this way, the two elastic elements can be fixed by a single connecting plate 13, simplifying the structure of the bracket 10.

[0039] Reference Figure 2 In one embodiment of the present invention, the connecting plate 13 is recessed with a limiting groove 131 on the surface facing the installation space, and at least a portion of the first elastic member 41 is inserted into the limiting groove 131.

[0040] In one embodiment of the present invention, the limiting groove 131 refers to a groove-shaped structure recessed on the surface of the connecting plate 13 facing the installation space. The limiting groove 131 is similar in shape to the first fixing part 411. The sidewall of the limiting groove 131 forms a physical constraint on the first elastic member 41, effectively limiting its lateral displacement in the vibration direction, preventing it from sliding or detaching during vibration, ensuring the stability and accuracy of the vibration of the lens assembly 20, thereby improving the continuity of speckle removal effect and imaging quality.

[0041] Reference Figure 1 and Figure 2 In one embodiment of the present invention, the lens assembly 20 includes a housing 21, a lens holder 23, and a diffuser 25. The first piezoelectric ceramic vibration assembly 40 is connected to the housing 21, the lens holder 23 is movably disposed within the housing 21, the second piezoelectric ceramic vibration assembly 50 is connected to the housing 21 and the lens holder 23 respectively, and the second piezoelectric ceramic vibration assembly 50 drives the lens holder 23 to vibrate relative to the housing 21 in the second direction; the diffuser 25 is fixed to the lens holder 23.

[0042] In one embodiment of the present invention, the outer shell 21 is the external support frame structure of the lens assembly 20. The outer shell 21 can be a rigid frame made of metal or engineering plastic, providing a mounting base for the entire lens assembly 20. The outer shell 21 is also connected to the first piezoelectric ceramic vibration component 40. The lens holder 23 is a rigid structure supporting the diffuser 25. The lens holder 23 is also suspended on the outer shell 21. The lens holder 23 can be connected to the outer shell 21 using a flexible or elastic connection structure, allowing the lens holder 23 to move in a controlled manner relative to the outer shell 21, thereby isolating vibration interference from different directions. The diffuser 25 is an optical element used to scatter the incident light beam. The diffuser 25 can be a glass or polymer lens, and its surface can be microstructured to effectively disperse speckle patterns formed by coherent interference through beam diffusion. The diffuser 25 can be fixedly mounted on the lens holder 23 by adhesive. By placing the second piezoelectric ceramic vibration component 50 between the lens holder 23 and the outer shell 21, the second piezoelectric ceramic vibration component 50 directly drives the lens holder 23 to vibrate relative to the outer shell 21 in a second direction. This allows the vibration objects in the second vibration direction and the first vibration direction to be independent yet coupled, thus avoiding energy loss and coupling interference caused by vibration sources from two directions acting on a single component simultaneously. This results in a continuous and complex composite vibration trajectory, effectively eliminating speckle. This embodiment achieves low power consumption, continuous vibration trajectory, and high control precision, effectively improving speckle performance.

[0043] Reference Figure 1 and Figure 2 In one embodiment of the present invention, the second piezoelectric ceramic vibration assembly 50 includes two second elastic elements 51 and a second piezoelectric ceramic sheet 53. The two ends of the second elastic elements 51 are respectively connected to the outer shell 21 and the lens holder 23. The two second elastic elements 51 are respectively disposed on opposite sides of the lens holder 23. The second piezoelectric ceramic sheet 53 is disposed on the surface of one of the two second elastic elements 51. After being energized, the second piezoelectric ceramic sheet 53 drives the second elastic element 51 to deform along the second direction, thereby driving the lens assembly 20 to vibrate along the second direction.

[0044] In one embodiment of the present invention, the second elastic element 51 is capable of controllable elastic deformation. The second elastic element 51 can be implemented by a metal sheet or composite material laminate structure. The second elastic element 51 provides a flexible connection path and ensures the smooth movement of the lens holder 23 during vibration. The two second elastic elements 51 are respectively connected to the outer shell 21 and the lens holder 23, and are symmetrically arranged on both sides of the lens holder 23 to ensure that the force is evenly distributed during vibration and avoid skewness or jamming caused by unilateral drive.

[0045] Like the first piezoelectric ceramic sheet 43, the second piezoelectric ceramic sheet 53 can generate the inverse piezoelectric effect to produce deformation, which in turn causes the second elastic element 51 to deform and drive the lens holder 23 to vibrate. The second piezoelectric ceramic sheet 53 can directly convert the input electrical signal into mechanical deformation, thereby efficiently driving the second elastic element 51 to vibrate. This avoids the complex transmission mechanism of traditional motors, ensures the smoothness of the vibration trajectory and the immediacy of the response, and effectively solves the problem of discontinuous vibration.

[0046] Reference Figure 2 In one embodiment of the present invention, the second elastic member 51 includes a first connecting portion 511, a second deformable portion 513 and a second connecting portion 515 connected in sequence and arranged at an angle. The first connecting portion 511 is fixed to the outer shell 21, the second piezoelectric ceramic sheet 53 is disposed on the second deformable portion 513, and the second connecting portion 515 is fixed to the lens holder 23.

[0047] In one embodiment of the present invention, the second elastic member 51 is a flexible steel sheet. The first connecting portion 511, the second deformable portion 513, and the second connecting portion 515 are integral structures. The included angle formed between the first connecting portion 511, the second deformable portion 513, and the second connecting portion 515 is a right angle, making the second elastic member 51 approximately U-shaped. The first connecting portion 511 and the second connecting portion 515 are both fixed to the outer shell 21 and the lens holder 23 by welding or adhesive. The second deformable portion 513 can undergo elastic deformation under stress. The second deformable portion 513 can be wavy or a thin-walled transition section, etc., to improve the elastic effect.

[0048] Reference Figure 2 In one embodiment of the present invention, the second connecting portions 515 of the two second elastic members 51 are connected to the lens holder 23 via a connector 27.

[0049] In one embodiment of the present invention, the connector 27 is fixed to one side of the lens holder 23 by welding or adhesive, and the two second elastic members 51 are connected to the lens holder 23 through the same connector 27. That is, the two second elastic members 51 act on the same side of the lens holder 23, which simplifies the connection structure between the two second elastic members 51 and the lens holder 23 and reduces the design difficulty.

[0050] It should be noted that the first connecting portions 511 of the two second elastic elements 51 and the second fixing portions 415 of the first elastic element 41 are both located on the same side of the outer shell 21 to further simplify the design and facilitate assembly. Specifically, the outer shell 21 has first connecting ears 211 and second connecting ears 213 protruding from opposite sides. The first elastic element 41 with the first piezoelectric ceramic sheet 43 is fixed to the first connecting ear 211, and the first connecting portions 511 of the two second elastic elements 51 are located on opposite sides of the first connecting ear 211. The first elastic element 41 without the first piezoelectric ceramic sheet 43 is fixedly connected to the second connecting ear 213 with the second fixing portion 415. The connector 27 is located on the surface of the lens holder 23 facing the second connecting ear 213, and the second connecting portions 515 of the two second elastic elements 51 are fixed to the connector 27 as an integral structure. A gap is provided between the second connecting ear 213 and the second connecting portion 515 to avoid interference between the lens holder 23 and the outer shell 21 during vibration.

[0051] A gap is provided between the lens holder 23 and the second deformable part 513, a gap is provided between the first deformable part 413 and the support plate 11, and a gap is also provided between the first deformable part 413 and the first connecting ear 211 and the second connecting ear 213. By setting the above gaps, interference between the outer shell 21 and the bracket 10 during vibration is avoided, and interference between the lens holder 23 and the outer shell 21 during vibration is avoided.

[0052] The present invention also proposes a projection device, which includes a housing and a speckle removal mechanism 100. The specific structure of the speckle removal mechanism 100 is as described in the above embodiments. Since the projection device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0053] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A speckle removal mechanism, characterized in that, include: A bracket, wherein the bracket forms an installation space; A lens assembly, which is suspended within the mounting space; as well as A first piezoelectric ceramic vibration assembly is connected to the bracket and the lens assembly respectively, and drives the lens assembly to vibrate in a first direction within the installation space; A second piezoelectric ceramic vibration assembly is disposed inside the lens assembly and drives at least a portion of the lens assembly to vibrate in a second direction within the mounting space; The first direction and the second direction are arranged to intersect.

2. The speckle removal mechanism as described in claim 1, characterized in that, The first piezoelectric ceramic vibration assembly includes: Two first elastic elements, each having its two ends connected to the bracket and the lens assembly respectively, are respectively disposed on opposite sides of the lens assembly; and A first piezoelectric ceramic sheet is disposed on the surface of one of the first elastic elements. When energized, the first piezoelectric ceramic sheet drives the first elastic element to deform along the first direction, thereby causing the lens assembly to vibrate along the first direction.

3. The speckle removal mechanism as described in claim 2, characterized in that, The first elastic element includes a first fixing part, a first deformable part, and a second fixing part that are connected in sequence and arranged at an angle. The first fixing part is fixed to the bracket, the first piezoelectric ceramic sheet is disposed on the first deformable part, and the second fixing part is fixed to the lens assembly.

4. The speckle removal mechanism as described in claim 2, characterized in that, The bracket includes a support plate and a connecting plate that are connected to each other and arranged at an angle. The support plate and the connecting plate enclose the installation space. The support plate is used to fix the speckle removal mechanism. The two first elastic elements are respectively fixed to both ends of the connecting plate.

5. The speckle removal mechanism as described in claim 4, characterized in that, The connecting plate has a recessed limiting groove on its surface facing the installation space, and at least a portion of the first elastic member is inserted into the limiting groove.

6. The speckle removal mechanism as described in any one of claims 1 to 5, characterized in that, The lens assembly includes: The housing is to which the first piezoelectric ceramic vibration assembly is connected; A lens holder is movably disposed within the housing. A second piezoelectric ceramic vibration assembly is connected to both the housing and the lens holder. The second piezoelectric ceramic vibration assembly drives the lens holder to vibrate relative to the housing in the second direction. A diffusion lens, which is fixed to the lens mount.

7. The speckle removal mechanism as described in claim 6, characterized in that, The second piezoelectric ceramic vibration assembly includes: Two second elastic members, each having its two ends connected to the outer casing and the lens mount respectively, are respectively disposed on opposite sides of the lens mount; and The second piezoelectric ceramic sheet is disposed on the surface of one of the two second elastic elements. When energized, the second piezoelectric ceramic sheet drives the second elastic element to deform along the second direction, thereby causing the lens assembly to vibrate along the second direction.

8. The speckle removal mechanism as described in claim 7, characterized in that, The second elastic element includes a first connecting part, a second deformable part, and a second connecting part that are connected in sequence and arranged at an angle. The first connecting part is fixed to the outer shell, the second piezoelectric ceramic sheet is disposed on the second deformable part, and the second connecting part is fixed to the lens holder.

9. The speckle removal mechanism as described in claim 8, characterized in that, The second connecting portions of the two second elastic elements are connected to the lens mount via a connector.

10. A projection device, characterized in that, The projection device includes a speckle removal mechanism as described in any one of claims 1 to 9.

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