Diffusing spot device and laser projection apparatus

Abstract

The utility model discloses a kind of speckle elimination device and laser projection equipment, it is related to display technical field, the speckle elimination device includes refracting portion, diffusion part and drive mechanism, the refracting portion is located in the light side of laser source, for receiving the laser beam output by the laser source and refracting offset the laser beam;The diffusion part is located in the light side of the refracting portion, for diverging the laser beam offset by the refracting portion;The drive mechanism is used to drive the refracting portion to rotate around at least one rotation axis of the geometric center of the refracting portion;Wherein, the rotation axis is arranged at angle with the output direction of the laser beam.The utility model aims at providing a kind of speckle elimination device, speckle elimination effect is good, optical machine is stable and the volume controllable.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and in particular to a speckle-reducing device and a laser projection device. Background Technology

[0002] Lasers are widely used in projection display due to their wide color gamut, high brightness, excellent monochromaticity, and directionality, giving laser projection devices significant advantages such as high brightness, wide color gamut, and long lifespan. However, due to the inherent high coherence of lasers, when a laser light source projects an image, it forms a random, granular interference pattern on the projected image, known as laser speckle.

[0003] Laser speckle severely affects the image quality of projected images, leading to color distortion, reduced sharpness, and easily causing visual fatigue in viewers. To eliminate laser speckle, related technologies commonly employ methods that dynamically disrupt laser coherence. For example, this involves moving the diffuser in one or two directions within a plane, or rotating the diffuser, utilizing the microscopic uneven structure of the diffuser surface to cause the incident parallel laser beam to exhibit different directions and phases at different times. This allows the speckle to be averaged through the time integration effect of the human eye or the superposition of different images, thereby eliminating the fixed speckle perceived by the human eye.

[0004] However, in designs where the diffuser uses reciprocating motion, its geometric center periodically shifts along the optical axis due to the linear back-and-forth movement. This periodic force is transmitted through the assembly structure (such as brackets and guide rails) with the main optical engine, causing the entire optical engine to vibrate regularly. This not only introduces additional mechanical noise but also causes flickering in the projected image. In designs where the diffuser uses rotational motion, the diffuser size needs to be significantly larger than the beam cross-section to ensure the laser beam completely covers the effective working area of ​​the diffuser, resulting in an increase in the overall size of the optical engine. Utility Model Content

[0005] The main purpose of this invention is to propose a speckle elimination device and a laser projection equipment, aiming to provide a speckle elimination device with good speckle elimination effect, stable optomechanical operation and controllable size.

[0006] To achieve the above objectives, the spot-dissipating device proposed in this utility model includes: A refractive section, located on the light-emitting side of the laser source, is used to receive the laser beam output by the laser source and refract and deflect the laser beam; A diffuser, located on the light-emitting side of the refractive section, is used to diffuse the laser beam deflected by the refractive section; and A driving mechanism, the driving mechanism being used to drive the refractive part to rotate around at least one rotation axis around the geometric center of the refractive part; The rotation axis is set at an angle to the output direction of the laser beam.

[0007] In one embodiment, the speckle-reducing device includes an optical lens, the optical lens including a light-transmitting substrate and a diffusion structure, the light-transmitting substrate including a first light-transmitting portion, a second light-transmitting portion and a diffusion structure, the first light-transmitting portion and the second light-transmitting portion being an integrally formed structure; at least a portion of the diffusion structure is formed in the second light-transmitting portion; Wherein, the first light-transmitting part is the refractive part, and the second light-transmitting part and the diffusion structure together constitute the diffusion part.

[0008] In one embodiment, the diffusion structure includes a plurality of first diffusion strips embedded in the second light-transmitting portion, the plurality of first diffusion strips being spaced apart, and the first diffusion strips extending along a first direction.

[0009] In one embodiment, the diffusion structure further includes a plurality of second diffusion strips embedded in the second light-transmitting portion, wherein the plurality of second diffusion strips intersect and are spaced apart from the plurality of first diffusion strips, and the second diffusion strips extend along a second direction; Wherein, the first direction intersects with the second direction.

[0010] In one embodiment, the diffusion structure includes a plurality of protrusions formed on the light-emitting surface of the second light-transmitting portion.

[0011] In one embodiment, the refractive part is a refractive lens, the diffuser part is a diffuser plate, and the refractive lens and the diffuser plate are spaced apart along the optical path direction of the laser source.

[0012] In one embodiment, the diffuser plate includes a substrate and a diffuser structure disposed on the light-incident side of the substrate. The diffuser structure includes a central diffuser region and a plurality of annular diffuser regions surrounding the central diffuser region. The position of the annular diffuser regions on the substrate corresponds to the offset trajectory of the light beam after being deflected by the refracting lens.

[0013] In one embodiment, the driving mechanism includes an electromagnetic driving assembly, the electromagnetic driving assembly comprising: A coil assembly, comprising two energized coils, wherein the two energized coils are arranged opposite each other and spaced apart along an axis; and A magnet, which is connected to the refractive part; The two energized coils are configured to drive the magnet to rotate the refractive part around the rotation axis, and the axis is set perpendicular to the rotation axis.

[0014] In one embodiment, the electromagnetic drive assembly includes two coil groups configured to drive the refractive portion to rotate about a first rotation axis and a second rotation axis that are perpendicular to each other.

[0015] This utility model also provides a laser projection device, characterized in that it includes the speckle elimination device as described above.

[0016] The speckle reduction device provided by this invention, through the use of a refractive section, a diffuser, and a driving mechanism, and a structural design that drives the refractive section to rotate around at least one rotation axis around its geometric center at an angle to the laser beam output direction, can solve the problems of optomechanical vibration, mechanical noise, projection image jitter, or increased optomechanical size in existing dynamic speckle reduction schemes. Specifically, the laser beam output from the laser source first enters the refractive section located on the output side, where the refractive section receives the laser beam and refracts and deflects it. The driving mechanism drives the refractive section to rotate around its own geometric center at an angle to the laser beam output direction, so that the refractive deflection direction of the laser beam by the refractive section continuously and dynamically changes with rotation. The refracted and deflected laser beam enters the diffuser located on the output side of the refractive section, where the diffuser diverges the laser beam. By combining the dynamic change of the refractive deflection direction with the diverging effect of the diffuser, the propagation direction and phase of the laser beam are continuously changed, disrupting the inherent coherence of the laser, and ultimately achieving speckle averaging by utilizing the time integration effect of the human eye. In this way, the drive mechanism drives the refractive part to rotate around its own geometric center. The geometric center of the refractive part will not periodically translate with the motion trajectory, and will not transmit periodic forces to the main body of the optical engine. This completely avoids the generation of optical engine vibration and additional mechanical noise, and prevents the projected image from jittering. Moreover, thanks to the dynamic refractive offset of the refractive part, the laser beam can be ensured to completely cover the effective working area of ​​the diffuser without increasing the size of the diffuser. This avoids the increase in the overall size of the optical engine caused by the excessive size of the diffuser, and balances the requirements of speckle reduction effect and optical engine miniaturization design. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A schematic diagram of an embodiment of the speckle-reducing device provided by this utility model; Figure 2 This is a schematic diagram of an embodiment of the optical lens provided by this utility model.

[0019] Explanation of icon numbers: 1000, Anti-spot device; 1, Optical lens; 11, Transmitting substrate; 111, First transmitting part; 112, Second transmitting part; 113, Diffusion structure; 1131, First diffusion strip; 1132, Second diffusion strip; 1a, Refractive part; 1b, Diffusion part; 2, Drive mechanism; 21, Coil group; 211, Energized coil; 22, Magnet.

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0022] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions 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 use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. 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 utility model.

[0024] This utility model proposes a spot-dissipating device 1000.

[0025] Please see Figure 1 In one embodiment, the spot-removing device 1000 includes: The refractive part 1a is located on the light-emitting side of the laser source and is used to receive the laser beam output by the laser source and refract and deflect the laser beam. A diffuser 1b, located on the light-emitting side of the refraction section 1a, is used to diffuse the laser beam deflected by the refraction section 1a; and Drive mechanism 2, which is used to drive the refraction part 1a to rotate around at least one rotation axis around the geometric center of the refraction part 1a; The rotation axis is set at an angle to the output direction of the laser beam.

[0026] It should be noted that the refractive part 1a is located on the light-emitting side of the laser source, and its core function is to receive the laser beam output from the laser source and refract and deflect it. Structurally, the refractive part 1a can be designed as an optical component with a specific curved surface profile or a polyhedral structure. Its geometric center is clearly defined and serves as a rotation reference, ensuring positional stability during rotation. In terms of materials, optical materials with excellent light transmittance and stable refractive index should be selected, such as optical glass and highly transparent resin. These materials can ensure minimal energy loss of the laser beam during transmission and possess good optical uniformity, accurately achieving the preset refractive deflection effect and laying the foundation for subsequent beam processing.

[0027] The diffuser 1b is located on the light-emitting side of the refraction section 1a and is mainly used to diverge the laser beam after it has been deflected by the refraction section 1a. Its structure can employ a microstructure array (such as a microlens array or microprism) or a diffuser surface design. These structures allow the incident laser beam to diverge uniformly, further disrupting the spatial coherence of the laser. The material must also meet high light transmittance requirements; common materials include quartz, optical plastics, and sapphire. These materials not only reduce energy loss during beam propagation but also possess stable physicochemical properties, allowing them to adapt to long-term working environments and ensuring the consistency and durability of the divergence effect.

[0028] The core function of the drive mechanism 2 is to provide rotational power for the refractive part 1a. Specifically, it drives the refractive part 1a to rotate around at least one rotation axis around its geometric center, and this rotation axis is set at an angle to the output direction of the laser beam. This angle design is key to achieving dynamic refraction offset, ensuring that the refraction offset direction of the laser beam continuously and dynamically changes as the refractive part 1a rotates. The drive mechanism 2 can be made of miniaturized drive components such as micro motors and piezoelectric drive elements. These components are characterized by their small size, stable operation, and high control precision. They can provide stable rotational power for the refractive part 1a while avoiding additional vibration or noise during operation. At the same time, they are suitable for the miniaturized design requirements of the optomechanical system and form a coordinated whole with the refractive part 1a and the diffuser 1b.

[0029] The refractive section 1a and the diffuser section 1b can be flexibly configured, either as a single unit or as separate units. When integrated, they are formed into a single optical component through a molding process (such as precision injection molding or integrated grinding of optical glass) or bonding with high-transmittance optical adhesive. This structure effectively reduces positioning errors during assembly, improves the stability of the optical system, simplifies the overall structural layout, and facilitates miniaturization and integration of the optomechanical system. When configured separately, the refractive section 1a and the diffuser section 1b are independent optical components, precisely positioned and installed using dedicated brackets, positioning pins, or optical adjustment mechanisms, maintaining a reasonable optical spacing between them. This configuration allows for flexible combination of refractive sections 1a and 1b with different refractive parameters and divergence angles to meet the needs of specific applications, enhancing the versatility and adaptability of the solution. Regardless of the configuration, the optical centers of the refractive section 1a and the diffuser section 1b must be precisely aligned to ensure the laser beam can smoothly enter from the refractive section 1a to the diffuser section 1b, thereby achieving synergistic function and realizing the desired speckle reduction effect.

[0030] The speckle reduction device 1000 provided by this utility model, through the structural design of a refractive section 1a, a diffuser section 1b, and a driving mechanism 2, drives the refractive section 1a to rotate around at least one rotation axis around its geometric center, with the rotation axis at an angle to the laser beam output direction. This design solves the problems of optomechanical vibration, mechanical noise, projection image jitter, or increased optomechanical size existing in existing dynamic speckle reduction schemes. Specifically, the laser beam output from the laser source first enters the refractive section 1a located on the output side. The refractive section 1a receives the laser beam and refracts and deflects it. The driving mechanism 2 drives the refractive section 1a to rotate around its own geometric center rotation axis, which is at an angle to the laser beam output direction. This causes the refractive deflection direction of the laser beam by the refractive section 1a to continuously and dynamically change with rotation. The refracted and deflected laser beam enters the diffuser section 1b located on the output side of the refractive section 1a, where the diffuser section 1b diverges the laser beam. By combining the dynamic change of the refractive deflection direction with the diverging effect of the diffuser section 1b, the propagation direction and phase of the laser beam are continuously changed, destroying the inherent coherence of the laser, and finally achieving speckle averaging by utilizing the time integration effect of the human eye. In this way, the drive mechanism 2 drives the refractive part 1a to rotate around its own geometric center. The geometric center of the refractive part 1a will not periodically translate with the motion trajectory, and will not transmit periodic forces to the main body of the optical engine, thus completely avoiding the generation of optical engine vibration and additional mechanical noise, and preventing the projection image from jittering. Moreover, thanks to the dynamic refraction offset of the refractive part 1a, the laser beam can be ensured to completely cover the effective working area of ​​the diffuser part 1b without increasing the size of the diffuser part 1b. This avoids the increase in the overall size of the optical engine caused by the excessive size of the diffuser part 1b, and takes into account both the speckle reduction effect and the miniaturization design requirements of the optical engine.

[0031] Please see Figure 2In one embodiment, the speckle-reducing device 1000 includes an optical lens 1, which includes a light-transmitting substrate 11 and a diffusion structure 113. The light-transmitting substrate 11 includes a first light-transmitting portion 111, a second light-transmitting portion 112, and the diffusion structure 113. The first light-transmitting portion 111 and the second light-transmitting portion 112 are integrally formed. At least a portion of the diffusion structure 113 is formed on the second light-transmitting portion 112. The first light-transmitting part 111 is the refractive part 1a, and the second light-transmitting part 112 and the diffusion structure 113 together constitute the diffusion part 1b.

[0032] It should be noted that the core component of the speckle reduction device 1000 is the optical lens 1, which is composed of a light-transmitting substrate 11 and a diffusion structure 113, forming an integrated optical functional component. The light-transmitting substrate 11, as the basic structure for carrying and transmitting the laser beam, is made of a light-transmitting material with stable optical properties, such as high-purity optical resin or special optical glass. These materials not only have excellent light transmittance but also maintain structural integrity and dimensional stability in an integrated molding process, ensuring low energy loss and precise optical path during laser beam propagation. The light-transmitting substrate 11 is further divided into a first light-transmitting part 111 and a second light-transmitting part 112. The two are made by an integral molding process (such as precision molding, melt molding, etc.), without splicing gaps or assembly interfaces, resulting in strong overall structural integrity and avoiding the risk of optical path misalignment caused by separate assembly. Among them, the first light-transmitting part 111 directly serves as the refractive part 1a of the device. Its structural shape is specially designed to present a specific curved profile (such as an aspherical surface, cylindrical surface, or composite curved surface) or an edge structure with a preset angle. By utilizing the refractive index of the material itself and the combination of structural shape, it achieves precise refraction and deflection of the incident laser beam without the need for an additional independent refractive part 1a, simplifying the composition of the optical system. The second light-transmitting part 112, as an extension of the light-transmitting substrate 11, maintains material consistency and structural continuity with the first light-transmitting part 111. Its surface or interior has reserved space for the formation of the diffusion structure 113, which can be a planar, curved surface, or a structure with micro-nano-level grooves. This provides stable substrate support for the formation of the diffusion structure 113, ensuring a tight bond between the diffusion structure 113 and the light-transmitting substrate 11, preventing detachment or failure. The diffusion structure 113 is directly formed onto the second light-transmitting part 112 using micro-nano forming technology (such as nanoimprinting, photolithography, etc.). At least a portion of its structure is physically integrated with the second light-transmitting part 112, rather than simply adhered. The morphology of the diffusion structure 113 can be designed as a microlens array, a microgroove array, a random diffuse microstructure, etc. The material can be an optical coating material with good compatibility with the light-transmitting substrate 11 or a microstructure extension of the same material, ensuring smooth light propagation at the interface without significant reflection or scattering loss. It should be clarified that the second light-transmitting part 112 does not function as a diffuser alone, but together with the diffuser structure 113 formed thereon, it constitutes the diffuser part 1b of the device. After the laser beam is refracted and deflected by the first light-transmitting part 111, it enters the second light-transmitting part 112. Through the conduction effect of the second light-transmitting part 112, it is guided to the diffuser structure 113. Then, the diffuser structure 113 uniformly disperses and modulates the phase of the beam. The two work together to further enhance the destructive effect on the coherence of the laser. In this embodiment, the optical lens 1 adopts an integrated design, with the first light-transmitting part 111 and the second light-transmitting part 112 integrally formed, and the diffusion structure 113 directly formed on the second light-transmitting part 112. This significantly reduces the number of optical components and assembly steps, and reduces the risk of optical path deviation caused by assembly errors. This not only improves the structural stability and optical performance consistency of the entire speckle elimination device 1000, but also, since the refraction and diffusion functions are integrated into the same optical lens 1, there is no need to set up separate refraction part 1a and diffusion part 1b, which effectively simplifies the overall structure of the device and is more conducive to the miniaturized integrated design of the optomechanical system. At the same time, the diffusion structure 113 and the second light-transmitting part 112 are tightly formed, with a strong bond and good optical compatibility. This reduces the energy loss and stray light generation of the beam at the interfaces of different components, ensuring the effective utilization of laser energy during speckle elimination and improving the uniformity and stability of the speckle elimination effect. Furthermore, the integrated structure reduces the gaps and assembly tolerances between components, reduces the impact of external environmental factors such as temperature changes and vibrations on optical performance, extends the service life of the device, and is suitable for application scenarios with long-term stable operation. Please see Figure 1 In one embodiment, the diffusion structure 113 includes a plurality of first diffusion strips 1131 embedded in the second light-transmitting portion 112, the plurality of first diffusion strips 1131 being spaced apart, and the first diffusion strips 1131 extending along a first direction.

[0033] It should be noted that the diffusion structure 113 is composed of multiple first diffusion strips 1131 as core units, and is tightly integrated with the second light-transmitting part 112 by embedding. These first diffusion strips 1131 are not simply attached to the surface of the second light-transmitting part 112, but are embedded into the interior or surface of the second light-transmitting part 112 through molding processes (such as injection molding, laser etching followed by filling, etc.). The embedding depth can be adjusted according to optical requirements to ensure a stable structural connection with the second light-transmitting part 112, avoiding detachment or displacement due to external forces or environmental changes during long-term use, and ensuring the continuity of the diffusion function. Structurally, multiple first diffusion strips 1131 are spaced apart, with uniform gaps between adjacent strips. These gaps are filled with the matrix material of the second light-transmitting part 112, forming an alternating distribution of "diffusion strips and matrix material." This spacing design allows the laser beam to interact with the first diffusion strips 1131 during propagation while maintaining a certain level of conductivity through the gaps, preventing excessive beam attenuation. Simultaneously, all first diffusion strips 1131 extend along the same first direction. This first direction can be determined based on the incident angle of the laser beam, the expected divergence direction, etc., such as a horizontal direction, a vertical direction, or a specific inclined direction parallel to the laser source's output surface. The extension shape can be designed as a straight line, a micro-arc, or a curve with a preset curvature, ensuring the directionality and regularity of the beam divergence effect and meeting the precise requirements for the laser beam diffusion angle in different scenarios. In terms of material selection, the first diffuser strip 1131 needs to be an optical material with a preset difference in refractive index from the substrate material of the second light-transmitting part 112. For example, if the second light-transmitting part 112 uses a high-transmittance optical resin, the first diffuser strip 1131 can be a special glass microstrip with a higher refractive index or another optical resin. Through the difference in refractive index between the two materials, the laser beam incident on the first diffuser strip 1131 will be refracted and scattered, thereby achieving a divergence effect. At the same time, the material of the first diffuser strip 1131 needs to have good optical uniformity and chemical stability, and its thermal expansion coefficient is similar to that of the substrate material of the second light-transmitting part 112, so as to avoid structural cracking caused by internal stress due to temperature changes and ensure stable optical performance. It should be added that the cross-sectional shape of the first diffuser 1131 has also been optimized. It can be rectangular, trapezoidal, semi-circular, triangular or irregular polygonal, etc. Different cross-sectional shapes will affect the interaction between the beam and the diffuser. For example, a diffuser with a triangular cross-section can form bidirectional refraction of the beam, while a rectangular cross-section is more conducive to achieving a uniform scattering effect. It can be flexibly selected according to the actual spot reduction requirements, further improving the adaptability of the diffuser structure 113. In this embodiment, by embedding multiple first diffusion strips 1131 into the second light-transmitting part 112 and extending them along the first direction, firstly, the embedding structure significantly improves the connection stability between the diffusion structure 113 and the second light-transmitting part 112, avoiding the problem of easy detachment of the traditional adhesive diffusion structure 113 and extending the service life of the device; secondly, the spaced diffusion strips and the substrate material are alternately distributed, which can achieve effective divergence through the difference in refractive index and reduce beam energy loss, ensuring laser utilization efficiency; thirdly, the directional design extending along the first direction gives the diffusion structure 113 a clear directionality and regularity in the divergence of the beam, which can precisely control the diffusion angle and range of the laser beam and adapt to the specific requirements of beam shape for different application scenarios such as projection and lighting; finally, the cross-sectional shape and extension direction of the first diffusion strips 1131 can be flexibly adjusted, and the combination of different materials makes the optical parameters of the diffusion structure 113 highly customizable, further expanding the application range of the speckle elimination device 1000. At the same time, the integrated embedding structure does not increase the overall complexity of the device and still maintains the advantage of miniaturization of the optomechanical system.

[0034] Please see Figure 1 In one embodiment, the diffusion structure 113 further includes a plurality of second diffusion strips 1132 embedded in the second light-transmitting portion 112. The plurality of second diffusion strips 1132 intersect and are spaced apart from the plurality of first diffusion strips 1131, and the second diffusion strips 1132 extend along the second direction. The first direction intersects with the second direction.

[0035] It should be noted that in this embodiment, the diffusion structure 113 adds multiple second diffusion strips 1132 to the original multiple first diffusion strips 1131, and the second diffusion strips 1132 are also embedded into the second light-transmitting part 112. Similar to the first diffusion strips 1131, the second diffusion strips 1132 are not surface-attached, but are embedded into the interior or surface of the second light-transmitting part 112 through a suitable molding process (such as secondary injection molding, precision milling and embedding). After embedding, they are tightly bonded to the substrate material of the second light-transmitting part 112 to form a stable structural whole, which can effectively resist the effects of environmental vibration and temperature fluctuations during long-term use, prevent loosening or detachment, and ensure the stable functioning of the overall diffusion structure 113. In terms of layout, the multiple second diffuser strips 1132 are interspersed and spaced apart from the multiple first diffuser strips 1131. "Interspersed" means that the second diffuser strips 1132 will form a cross distribution in the gap area between the first diffuser strips 1131, rather than being simply arranged in parallel. For example, when the first diffuser strips 1131 extend in the horizontal direction, the second diffuser strips 1132 will pass through the gaps between adjacent first diffuser strips 1131, forming a cross structure similar to a grid. At the same time, a uniform interval is maintained between adjacent second diffuser strips 1132, as well as between the second diffuser strips 1132 and the first diffuser strips 1131. The interval area is filled with the substrate material of the second light-transmitting part 112, ensuring that the laser beam can interact with the first diffuser strips 1131 and the second diffuser strips 1132 respectively in the propagation path, and can also maintain smooth conduction through the substrate material of the interval area, avoiding excessive loss of beam energy due to excessive density of diffuser strips. In the extension direction, the second diffusion strip 1132 extends along a preset second direction, and its key feature is that the first direction intersects with the second direction. This "intersection" can be designed as a perpendicular intersection (e.g., the first direction is horizontal and the second direction is perpendicular, forming a 90° angle) or a non-perpendicular acute or obtuse angle intersection (e.g., 30°, 60°, 120°, etc.). The specific angle needs to be determined in conjunction with the incident characteristics of the laser beam and the expected dispersion uniformity requirements. For example, when uniform dispersion of the laser beam is required in both horizontal and vertical dimensions, a design where the first and second directions intersect perpendicularly can be used; if the dispersion effect in a certain oblique dimension needs to be emphasized, a non-perpendicular intersection direction can be selected. Through the cross-distribution of directions, the effect of the diffusion structure 113 on the laser beam covers a wider range of directional dimensions. In terms of material and shape design, the material of the second diffuser 1132 needs to be compatible with the substrate material of the second light-transmitting part 112. It is usually an optical material with a different refractive index than the material of the first diffuser 1131 (or the same material as the first diffuser 1131 depending on the requirements). For example, if the first diffuser 1131 is made of high refractive index special glass, the second diffuser 1132 can be made of medium refractive index optical resin. By using different diffuser materials and substrate materials, and by using different diffuser materials, the refraction and scattering effect on the laser beam is enhanced. Its cross-sectional shape can also be flexibly designed. It can be the same as the first diffuser 1131 (e.g., both are rectangular), or it can be different (e.g., the first diffuser 1131 is rectangular and the second diffuser 1132 is triangular). By using shape differences, the uniformity of beam divergence is further optimized to ensure that the laser beam can obtain a stable diffusion effect in the intersection direction. In this embodiment, a second diffusion strip 1132, interspersed and extending along the intersecting direction, is added to the first diffusion strip 1131. Firstly, the intersecting diffusion strip structure allows the laser beam to be diffused in both intersecting directions, breaking the limitation of a single-direction diffusion strip on the beam divergence dimension, significantly improving the uniformity of laser beam divergence, effectively disrupting the spatial coherence of the laser, further optimizing the speckle elimination effect, and avoiding the problem of local speckle residue. Secondly, the interspersed layout, while increasing the diffusion dimension, still retains the beam propagation channel through uniform spacing, avoiding excessive beam energy loss and ensuring... Laser utilization efficiency; furthermore, the intersection angle between the first and second directions can be flexibly adjusted, and combined with diffuser strips of different materials and cross-sectional shapes, it can adapt to more diverse application scenarios (such as projection equipment and laser lighting devices with special requirements for beam divergence angle and direction), improving the versatility of the device; finally, the second diffuser strip 1132 is also embedded in the second light-transmitting part 112 without adding additional assembly parts, and still maintains the integrated characteristics of the diffuser structure 113 and the second light-transmitting part 112, which will not lead to an increase in the overall complexity of the device, and takes into account the design requirements of improving speckle reduction effect and miniaturization of the optical engine.

[0036] In one embodiment, the diffusion structure 113 includes a plurality of protrusions formed on the light-emitting surface of the second light-transmitting portion 112.

[0037] It should be noted that the diffusion structure 113 is composed of multiple bumps as core units, and these bumps are not set by post-attachment or assembly, but are directly formed on the light-emitting surface of the second light-transmitting part 112, forming an integrated structure with the second light-transmitting part 112. The forming process can employ precision injection molding, hot pressing, laser micromachining, or photolithography, selecting the appropriate process based on the design shape of the bumps. For example, for small and complex bumps, photolithography combined with coating can be used; for regular bumps produced in batches, precision injection molding is more efficient. This direct forming method ensures that there are no gaps or adhesive layers between the bumps and the light-emitting surface of the second light-transmitting part 112, not only avoiding the problem of bump detachment due to weak adhesion, but also reducing light energy loss caused by interface reflection, ensuring smooth beam propagation. From a structural perspective, the shapes of the multiple protrusions can be flexibly designed according to optical divergence requirements. Common shapes include hemispherical, semi-ellipsoidal, conical, pyramidal, or irregular curved protrusions. Different protrusion shapes affect the laser beam differently. For example, hemispherical protrusions can form uniform scattering of the incident beam in all directions, while conical protrusions are more likely to guide the beam to diverge in a specific direction. At the same time, the distribution of the protrusions on the light-emitting surface of the second light-transmitting part 112 can also be adjusted. They can be uniformly arrayed (such as rectangular arrays or hexagonal arrays) or randomly distributed. Array distribution makes the beam divergence effect more regular, while random distribution can further disrupt the coherence of the laser and reduce the generation of periodic speckle. In addition, the top of the protrusions can be designed as a smooth curved surface or a rough surface with micro-textures. Smooth curved surfaces help reduce excessive scattering of the beam, while rough surfaces can enhance the scattering effect. The choice can be made according to the actual speckle reduction requirements. In terms of materials, the protrusions and the second light-transmitting part 112 can be made of the same material or different materials. If the same material is used (e.g., both are high-transmittance optical resins), it can ensure that the refractive indices of the two are consistent, avoiding additional interface refraction due to material differences, and beam divergence is achieved solely through the shape of the protrusions. If different materials are used, an optical material with a preset difference in refractive index from the second light-transmitting part 112 must be selected (e.g., the second light-transmitting part 112 is optical glass, and the protrusions are high-refractive-index optical adhesives cured and molded). Through the dual effect of the difference in refractive index of the materials and the shape of the protrusions, the scattering effect on the light beam is enhanced. Regardless of the material chosen, it is necessary to ensure that the protrusions have excellent light transmittance, optical uniformity, and chemical stability to avoid beam attenuation and a decrease in scattering effect due to material impurities or aging. It should be added that although the specific dimensions of the convex height are not mentioned, it can be designed according to the required divergence angle. Generally, the convex height should ensure that the incident beam undergoes significant refraction or scattering on the convex surface, while preventing excessive height from causing adjacent convex points to block each other and affecting the overall beam divergence uniformity. The spacing between adjacent convex points also needs to be reasonably controlled, ensuring that each convex point can independently affect the beam, while a dense distribution of convex points achieves comprehensive beam coverage of the entire emitting surface, avoiding any unaffected beam areas. In this embodiment, the bumps are directly formed on the light-emitting surface, without requiring additional space inside the device, and will not increase the axial or radial dimensions of the optical system. This meets the design requirements for miniaturization of the optical engine. Compared with complex microlens arrays or diffuser strip structures, the processing technology of the bump structure is simpler and the cost is lower, making it particularly suitable for mass production and effectively reducing the manufacturing cost of the speckle removal device 1000. Please see Figure 1 In one embodiment, the refractive part 1a is a refractive lens, and the diffuser part 1b is a diffuser plate. The refractive lens and the diffuser plate are arranged at intervals along the optical path direction of the laser source.

[0038] It should be noted that in this embodiment, the refractive part 1a of the speckle reduction device 1000 specifically adopts the structure of a refractive lens. As the core component for receiving and refractioning the deflected laser beam, it is not a simple planar transparent structure, but an optical lens 1 with a specific curved surface profile. Common designs include convex lenses, concave lenses, plano-convex lenses, plano-concave lenses, or aspherical lenses. Different lens types correspond to different refractive effects. For example, a convex lens can produce converging refraction deflection of the incident laser beam, while a concave lens can achieve divergent refraction deflection. An aspherical lens can reduce spherical aberration, allowing the refracted beam to be more accurately directed towards the subsequent diffuser 1b. In terms of material selection, the refractive lens needs to use optical materials with high transmittance and low dispersion, such as crown glass, flint glass, or high-purity polycarbonate. These materials can ensure low energy loss of the laser beam while achieving precise control of the laser beam propagation direction through their stable refractive index combined with the curved surface structure of the lens, meeting the requirements for beam refraction deflection angle in different scenarios. The diffuser section 1b adopts a diffuser plate structure, complementing the refractive lens. Its core function is to uniformly disperse the laser beam after it has been deflected by the refractive lens. The key to the diffuser plate's structural design lies in the microscopic morphology of its light-transmitting surface. This can be achieved by processing microstructures (such as micro-dimple arrays or micro-prism arrays) on the plate surface or by adding scattering particles (such as nano-sized silica particles or organic scattering agents) internally. Compared to surface microstructure design, diffuser plates with internally added scattering particles allow the beam to undergo multiple scatterings within the plate, resulting in a more uniform dispersion effect and less susceptibility to surface wear. Surface microstructure design, on the other hand, allows for more precise control of the dispersion angle. In terms of materials, diffuser plates typically use lightweight, impact-resistant, and light-transmitting materials such as acrylic sheets, polystyrene sheets, or optical-grade PET sheets. These materials are not only easy to process but also, while ensuring high light transmittance, effectively disrupt the spatial coherence of the laser through their structural characteristics or added scattering components, laying the foundation for subsequent speckle removal. In this embodiment, both the refractive lens and the diffuser are mature optical components that are easy to mass-produce. They do not require a complex integrated molding process, which greatly reduces the design and manufacturing costs of the device. They are also easy to replace individually during later maintenance, reducing maintenance costs. Furthermore, there is no need to consider the compatibility of the materials or the matching of the molding processes. The best materials most suitable for their respective functions can be selected, which further ensures the stability of the refraction shift and divergence effect, and ultimately improves the working reliability and consistency of the anti-spot effect of the entire anti-spot device 1000.

[0039] In one embodiment, the diffuser plate includes a substrate and a diffuser structure 113 disposed on the light-incident side of the substrate. The diffuser structure 113 includes a central diffuser region and a plurality of annular diffuser regions surrounding the central diffuser region. The position of the annular diffuser regions on the substrate corresponds to the deflection trajectory of the light beam after being deflected by the refracting lens.

[0040] It should be noted that the diffuser plate is based on a substrate as its supporting structure. The substrate, serving as the mounting base for the diffuser structure 113, must possess good structural stability and light transmittance. Commonly used materials include optical-grade acrylic sheets, polystyrene sheets, or high-transmittance PET sheets. These materials are not only lightweight and impact-resistant, maintaining shape stability over long-term use and preventing deformation due to external forces or temperature changes, but their high light transmittance also ensures low energy loss when the laser beam passes through the substrate, providing a favorable foundation for the subsequent beam processing by the diffuser structure 113. The diffusion structure 113, located on the light-incident side of the substrate, adopts a layered layout design of "central diffusion region + annular diffusion region," which together constitute a complete beam divergence unit. The central diffusion region is located at the core of the diffusion structure 113. Its shape can be designed as a circle, a regular polygon, or an irregular shape adapted to the initial incident spot shape of the laser beam, specifically determined according to the default shape of the output spot of the laser source, ensuring that the laser beam can be completely incident on the central diffusion region without excessive deflection. The diffusion function of this region is achieved through microstructures, such as processing dense micro-pits or microlens arrays on the surface, or doping nanoscale scattering particles (such as silicon dioxide particles) inside, so that the incident beam is uniformly scattered in this region, initially disrupting the coherence of the laser. Multiple annular diffusion regions surrounding the central diffusion region are distributed concentrically or nearly concentrically, with extremely narrow gaps (filled by the substrate material) between adjacent annular diffusion regions, forming a "center-annular" nested structure. The width and number of rings of each annular diffusion region can be determined based on the maximum deflection angle of the refracting lens and the coverage area of ​​the beam deflection trajectory. This ensures that even with the maximum deflection amplitude, the beam can still be incident on the outermost annular diffusion region. Crucially, the position of the annular diffusion region on the substrate is precisely calculated to perfectly correspond to the beam deflection trajectory after the refracting lens deflects. When the driving mechanism 2 rotates the refracting lens around its geometric center, the beam will form a specific arc or annular deflection trajectory as the lens deflects. The radius and distribution density of the annular diffusion region precisely match this trajectory, ensuring that no matter where the beam deflects, it can accurately incident on the corresponding annular diffusion region, avoiding energy waste or incomplete speckle elimination caused by beam "missing the target."

[0041] Please see Figure 1 In one embodiment, the drive mechanism 2 includes an electromagnetic drive assembly, which includes: Coil group 21, comprising two energized coils 211, the two energized coils 211 being arranged opposite each other and spaced apart along an axis; and Magnet 22 is connected to the refractive part 1a; Two energized coils 211 are configured to drive the magnet 22 to rotate the refractive part 1a around the rotation axis, with the axis being perpendicular to the rotation axis.

[0042] It should be noted that coil group 21, as the electromagnetically driven magnetic field generating component, consists of two energized coils 211, which are arranged opposite each other along the same axis and spaced apart. Here, "axis" refers to the virtual straight line formed by connecting the centers of the two coils. The opposite arrangement means that the like magnetic poles of the two coils (such as both being N poles or both being S poles) face each other, or the unlike magnetic poles face each other. The specific polarity configuration can be adjusted according to the required magnetic field direction. The spaced arrangement is to reserve a specific space between the two coils. This space not only provides a accommodating area for the movement of magnet 22, but also ensures that the magnetic fields generated by the two coils can form a superposition or gradient distribution in the space, avoiding mutual interference of magnetic fields due to the coils being too close, or insufficient magnetic field strength due to the coils being too far apart. The energized coil 211 is typically made of highly conductive metal wire (such as copper enameled wire or aluminum enameled wire), with an insulating coating on the surface to prevent short circuits when energized. The coil can be wound in a close-wound, spaced-wound, or multi-layered manner, with the number of turns determined by the required magnetic field strength to ensure a sufficiently strong magnetic field is generated to drive the magnet 22. Simultaneously, the winding parameters (such as the number of turns and wire diameter) of the two coils can be kept consistent to form a symmetrical magnetic field distribution, facilitating precise control of the rotation angle of the magnet 22.

[0043] The magnet 22 connected to the refractive part 1a is an electromagnetically driven force-bearing component. Its connection method must ensure structural stability and not affect the optical performance of the refractive part 1a. For example, it can be bonded to the non-optical area (such as the edge side) of the refractive part 1a by a high-strength, low-thermal-conductivity adhesive (such as optical epoxy glue), or the magnet 22 can be fixed to the refractive part 1a by a customized metal / plastic bracket. The bracket material must be a lightweight material (such as titanium alloy or polyetheretherketone) to avoid increasing the overall weight of the refractive part 1a and causing excessive rotational inertia. The magnet 22 can be made of permanent magnet materials (such as neodymium iron boron permanent magnets and samarium cobalt permanent magnets). These materials have the characteristics of high remanence and high coercivity, and can stably generate force under the action of an external magnetic field. They can maintain magnetism without additional power, thus reducing the energy consumption of the drive mechanism 2. The magnet 22 can be designed as a cylinder, cuboid, ring, or sector. The specific shape needs to be adapted to the magnetic field area formed by the coil group 21. For example, if the coil group 21 generates a ring magnetic field, the magnet 22 can be designed as a cylinder to ensure that it can be uniformly stressed in the magnetic field and achieve smooth rotation.

[0044] In this embodiment, after the two energized coils 211 are energized, they generate magnetic fields with specific directions and intensities. These magnetic fields act on the corresponding magnets 22, subjecting them to electromagnetic torque. Since the magnets 22 are fixedly connected to the refractive part 1a, the electromagnetic torque drives the refractive part 1a to rotate synchronously around a preset rotation axis, thereby achieving dynamic adjustment of the refractive part 1a. Crucially, the axes of the two energized coils 211 are perpendicular to the rotation axis of the refractive part 1a. This layout design allows the magnetic field generated by the coils to form an optimal force angle with the rotation axis, ensuring that the electromagnetic torque is efficiently converted into rotational power for the refractive part 1a. This avoids power loss caused by the magnetic field force being parallel to the rotation axis, and also reduces the lateral force exerted by the magnets 22 on the coils during rotation, reducing friction and wear between components. For example, if the rotation axis of the refractive part 1a extends horizontally, then the axes of the two coils are distributed vertically, allowing the magnetic force to directly drive the magnets 22 to rotate around the horizontal rotation axis, improving driving efficiency and control accuracy. In addition, to achieve precise control of the rotation angle of the refractive part 1a, the two energized coils 211 can be used by pulse width modulation (PWM) or current magnitude adjustment. By changing the direction and intensity of the current flowing into the coils, the direction and intensity of the magnetic field can be adjusted, thereby controlling the rotation direction, speed and amplitude of the refractive part 1a driven by the magnet 22, so as to meet the dynamic requirements of laser beam refraction offset in different scenarios. In one embodiment, the electromagnetic drive assembly includes two coil groups 21, which are configured to drive the refractive part 1a to rotate about a first rotation axis and a second rotation axis that are perpendicular to each other.

[0045] It should be noted that, from a spatial layout perspective, the two coil groups 21 need to be oriented according to the perpendicular relationship between the first and second rotation axes. Assuming the first rotation axis extends horizontally (e.g., along the X-axis), then the axes of the two energized coils 211 of the first coil group 21 that drives the first rotation axis must be perpendicular to the first rotation axis (i.e., along the vertical direction, such as the Z-axis) to ensure that the magnetic field generated by the coils can exert an electromagnetic torque around the X-axis on the magnet 22; while the axes of the two energized coils 211 of the second coil group 21 that drives the second rotation axis (along the vertical direction, such as the Y-axis, perpendicular to the X-axis) must be perpendicular to the second rotation axis (i.e., along the horizontal direction, such as the X-axis) so that the magnetic force can be converted into a torque around the Y-axis. The two coil groups 21 are usually orthogonally distributed with the magnet 22 as the center. For example, the first coil group 21 is symmetrically distributed on the upper and lower sides of the magnet 22 along the Z-axis, and the second coil group 21 is symmetrically distributed on the left and right sides of the magnet 22 along the X-axis. The space between each coil group 21 can accommodate the movement of the magnet 22 in the corresponding rotation axis direction, so as to avoid the coil and the magnet 22 from colliding during rotation. In terms of the logic of cooperation with magnet 22, the two coil groups 21 need to share the same magnet 22 connected to the refraction part 1a, or two independent but synchronously linked magnets 22 can be set (in practical applications, a single magnet 22 is mainly used to simplify the structure). If a shared magnet 22 design is adopted, the magnet 22 needs to have the characteristic of being able to bear force in two perpendicular directions. For example, a cubic permanent magnet or a cylindrical permanent magnet can be selected (its magnetic pole direction needs to be adapted to the magnetic field direction of the two coil groups 21) to ensure that when the first coil group 21 is energized, the magnet 22 can drive the refraction part 1a to rotate around the first rotation axis under the action of the magnetic field; when the second coil group 21 is energized, the magnet 22 can drive the refraction part 1a to rotate around the second rotation axis under the action of the magnetic field in another direction. The energization control of the two coil groups 21 needs to be independent of each other. The current direction and intensity of each coil can be adjusted by a separate current control module to achieve independent control of the rotation parameters (speed, amplitude) in the two rotation axis directions. It can drive the refraction part 1a to rotate around a certain rotation axis individually, or drive it simultaneously to achieve a composite rotation trajectory, further enriching the dynamic changes of beam refraction and offset. In addition, to ensure rotational accuracy in both rotational axes, the winding parameters (number of turns, wire diameter) of the two sets of coil groups 21 need to be determined according to the driving torque required by the corresponding rotational axis. For example, if a larger torque is required to overcome the inertia of the refractive part 1a when rotating around the first rotational axis, the number of turns of the first coil group 21 can be appropriately increased, or a thicker wire can be selected to improve the current carrying capacity. At the same time, the installation position of the coil group 21 needs to be precisely calibrated to ensure that the axis of each coil group 21 is strictly perpendicular to the corresponding rotational axis, so as to avoid the magnetic force generating an additional component force due to installation deviation, which would affect the rotational stability or cause component wear.

[0046] In this embodiment, the electromagnetic drive assembly constructs a multi-dimensional drive structure by setting two independent coil groups 21 to realize the rotation of the refractive part 1a around two mutually perpendicular rotation axes, further expanding the adjustment range of beam refraction offset, enabling the laser beam to achieve dynamic offset in multiple directions and angles in a two-dimensional plane, further increasing the dimension of beam propagation direction and phase change, which can more thoroughly destroy the inherent coherence of the laser and greatly improve the speckle elimination effect.

[0047] This utility model also provides a laser projection device, characterized in that it includes the speckle-reducing device 1000 as described in the above technical solution. Since this laser projection device adopts all the above technical solutions, it possesses at least all the beneficial effects brought about by the speckle-reducing device 1000, which will not be elaborated further here.

[0048] The above are merely exemplary embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the technical concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A device for eliminating speckles, characterized in that, include: A refractive section, located on the light-emitting side of the laser source, is used to receive the laser beam output by the laser source and refract and deflect the laser beam; A diffuser, located on the light-emitting side of the refractive section, is used to diffuse the laser beam deflected by the refractive section; as well as A driving mechanism, the driving mechanism being used to drive the refractive part to rotate around at least one rotation axis around the geometric center of the refractive part; The rotation axis is set at an angle to the output direction of the laser beam.

2. The spot-removing device as described in claim 1, characterized in that, The speckle-reducing device includes an optical lens, which includes a light-transmitting substrate and a diffusion structure. The light-transmitting substrate includes a first light-transmitting portion, a second light-transmitting portion, and a diffusion structure. The first light-transmitting portion and the second light-transmitting portion are integrally formed. At least a portion of the diffusion structure is formed in the second light-transmitting portion. Wherein, the first light-transmitting part is the refractive part, and the second light-transmitting part and the diffusion structure together constitute the diffusion part.

3. The spot-dissipating device as described in claim 2, characterized in that, The diffusion structure includes a plurality of first diffusion strips embedded in the second light-transmitting portion, the plurality of first diffusion strips being spaced apart, and the first diffusion strips extending along a first direction.

4. The spot-dissipating device as described in claim 3, characterized in that, The diffusion structure further includes a plurality of second diffusion strips embedded in the second light-transmitting portion, wherein the plurality of second diffusion strips intersect and are spaced apart from the plurality of first diffusion strips, and the second diffusion strips extend along the second direction; Wherein, the first direction intersects with the second direction.

5. The spot-removing device as described in claim 3, characterized in that, The diffusion structure includes multiple protrusions formed on the light-emitting surface of the second light-transmitting portion.

6. The spot-removing device as described in claim 1, characterized in that, The refractive part is a refractive lens, and the diffuser part is a diffuser plate. The refractive lens and the diffuser plate are spaced apart along the optical path direction of the laser source.

7. The spot-removing device as described in claim 6, characterized in that, The diffuser plate includes a substrate and a diffuser structure disposed on the light-incident side of the substrate. The diffuser structure includes a central diffuser region and a plurality of annular diffuser regions surrounding the central diffuser region. The position of the annular diffuser regions on the substrate corresponds to the offset trajectory of the light beam after being deflected by the refracting lens.

8. The spot-removing device according to any one of claims 1 to 7, characterized in that, The driving mechanism includes an electromagnetic driving component, which includes: A coil assembly, comprising two energized coils, wherein the two energized coils are arranged opposite each other and spaced apart along an axis; and A magnet, which is connected to the refractive part; The two energized coils are configured to drive the magnet to rotate the refractive part around the rotation axis, and the axis is set perpendicular to the rotation axis.

9. The spot-removing device as described in claim 8, characterized in that, The electromagnetic drive assembly includes two coil groups, which are configured to drive the refractive part to rotate about a first rotation axis and a second rotation axis that are perpendicular to each other.

10. A laser projection device, characterized in that, Includes the spot-removing device as described in any one of claims 1 to 9.

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