Rotary diffusion device and light source and projection system thereof

Abstract

The invention discloses a rotary diffusion device which comprises a fixed driving mechanism, the fixed driving mechanism comprises a fixed driving part body and a fixed driving coil, the fixed driving part body is of a hollow annular structure and comprises an inner wall and an outer wall, and the fixed driving coil is arranged on the inner wall of the fixed driving part body; the fixed driving coil is fixedly arranged on the inner wall of the fixed driving part body, and the middle area of the fixed driving mechanism is in a through hole shape; the rotating mechanism comprises a rotating part body, the middle area of the rotating part body is in a through hole shape, the rotating mechanism and the fixed driving mechanism are arranged in a matched mode, and the fixed driving mechanism can drive the rotating mechanism to rotate in the preset direction; and the diffusion sheet is fixedly arranged in the through hole in the middle area of the rotating part body. And the diffusion sheet is arranged in the rotating part body, so that dynamic speckle treatment is realized, and the speckle eliminating effect is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of lighting and projection technology, and in particular to a rotating diffusion device and its light source and projection system. Background Technology

[0002] In recent years, laser projection technology has been widely used in the field of projection display due to its advantages such as high brightness, high color fidelity, long lifespan, energy saving, and environmental friendliness. However, the high coherence of laser light sources leads to speckle effect in laser projection displays, causing a decrease in projected image quality and reducing the user's viewing experience. Speckle refers to the interference in space caused by scattered light from a coherent light source illuminating a rough object. Because the phase difference is constant, the light waves have the same frequency, and the vibration direction is consistent, this interference results in alternating bright and dark spots on the screen. These unfocused spots appear flickering to the human eye, and prolonged viewing can easily cause discomfort, seriously affecting the quality of the projected image.

[0003] To address the speckle problem, existing technologies employ various speckle reduction techniques, such as incorporating dynamic or static diffusers in the illumination path. However, these methods still have limitations. For instance, while static diffusers are small, their fixed nature results in insufficient randomness in directional distortion, leaving speckle. Dynamic diffusers, although capable of relatively randomizing light directionality, require additional motors, rotating wheels, and related devices, leading to a larger size and increasing the overall size of the optical system. Furthermore, existing speckle reduction components are ineffective in resolving laser speckle issues in laser projection, thus affecting the quality of the displayed image.

[0004] Therefore, effectively reducing laser speckle effect while ensuring optical performance and homogenizing the laser illumination source have become pressing technical problems. In particular, designing a simple, low-cost, and effective speckle-eliminating device is a key factor in evaluating projection system performance. Developing a novel rotating diffusion wheel device that can effectively eliminate speckle and improve viewing experience, while also possessing advantages such as simple structure, small size, and low cost, will provide new insights for the development of laser projection display technology. Summary of the Invention

[0005] Therefore, it is necessary for the present invention to provide a rotating diffusion device and its light source and projection system to solve the above-mentioned technical problems.

[0006] One technical solution of the present invention is: A rotary diffusion device, comprising: A fixed drive mechanism includes a fixed drive component body and a fixed drive coil. The fixed drive component body is a hollow annular structure, and includes an inner wall and an outer wall. The fixed drive coil is fixedly disposed on the inner wall of the fixed drive component body. The middle region of the fixed drive mechanism is a through hole. A rotating mechanism includes a rotating component body, the middle region of which is a through hole. The rotating mechanism is matched with a fixed driving mechanism, and the fixed driving mechanism can drive the rotating mechanism to rotate in a preset direction. A diffuser plate is fixedly disposed in the through-hole area in the middle of the rotating component body.

[0007] In one specific embodiment, the rotating mechanism is placed inside the through hole of the fixed drive mechanism.

[0008] In one specific embodiment, the diffuser sheet includes a first surface and a second surface disposed opposite to each other, and the first surface and / or the second surface of the diffuser sheet are provided with a diffusion structure.

[0009] In one specific embodiment, the diffuser sheet is fixed to the through hole of the rotating component body by an adhesive structure.

[0010] In one specific embodiment, the diffuser sheet is fixed in the through hole of the rotating component body by a fixing structure.

[0011] In one specific embodiment, the fixing structure includes a fixing structure step and a fixing structure snap-fit, and the diffuser is placed at the fixing structure step and fixed by the fixing structure snap-fit.

[0012] In one specific embodiment, the fixing structure is a ring-shaped structure, which is fixedly placed on the wall of the through hole of the rotating component body.

[0013] In one specific embodiment, the rotating component body includes a rotating component step portion, which is located on the wall of the through hole of the rotating component body; wherein, the rotating component step portion includes a rotating component step and a rotating component step retaining member, and the diffuser is placed at the rotating component step and fixed by the rotating component step retaining member.

[0014] In one specific embodiment, the rotating component body includes a rotating component body extension, which is integral with the rotating component body. The rotating component body extension has a fluorescent layer on its surface facing the fixed drive component body.

[0015] In one specific embodiment, the fixed drive mechanism is placed inside the through hole of the rotating mechanism, wherein the rotating component body includes a rotating component body extension, the rotating component body extension and the rotating component body are integrally formed, and the diffuser is fixedly disposed on the inner wall of the rotating component body extension.

[0016] A light source includes a laser light source emitting device and any of the rotating diffusion devices described above.

[0017] A projection system includes an optical path system and the light source described above.

[0018] The rotary diffuser device provided in this application has the following beneficial effects: 1. The present invention uses a glass diffuser sheet with a rough surface on one or both sides. By placing the rotating component body inside the fixed driving component body and placing the diffuser sheet inside the rotating component body or extension, the rotating component body rotates and drives the diffuser sheet to rotate, thereby realizing dynamic speckle treatment. This effectively avoids the speckle problem caused by the directional fixation of traditional static diffusers and significantly improves the speckle elimination effect. 2. The present invention adopts a fixed drive component body with a through-hole design and a rotating component body with a through-hole design. The diffuser is directly set in the through-hole, which makes the installation method simple and convenient, reduces the complexity of the installation process, and lowers the production cost; 3. This invention achieves the dynamic movement of the diffuser plate through the simple rotation of the rotating component body with through holes, avoiding the complexity of the transmission mechanism, improving the reliability and stability of the device, and reducing the failure rate. 4. The diffuser sheet of the present invention is made of glass, which has good optical performance and durability. It can maintain a stable performance state during long-term use, extend service life, and reduce maintenance costs. Attached Figure Description

[0019] Other features, objectives, and beneficial effects of this application will become more apparent from the following detailed description of the reference embodiments with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of a rotating diffusion device according to the present invention; Figure 2 This is another structural schematic diagram of a rotary diffusion device according to the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of a rotary diffusion device according to the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of a rotary diffusion device according to the present invention; Figure 5This is a schematic diagram of the cross-sectional structure of a rotary diffusion device according to the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of a rotary diffusion device according to the present invention; Figure 7 This is another structural schematic diagram of a rotary diffusion device according to the present invention; Figure 8 This is a schematic diagram of the cross-sectional structure of a rotating diffusion device according to the present invention.

[0021] Icon description: 10-Fixed drive component body; 11-Fixed drive coil; 20-Rotating component body; 21-Rotating component step; 210-Rotating component step; 211-Rotating component step snap-fit; 22, 23-Rotating component body extension; 30-Diffuser sheet; 40-Adhesive structure; 50-Fixed structure; 501-Fixed structure step; 502-Fixed structure snap-fit; 60-Fluorescent layer. Detailed Implementation

[0022] To facilitate understanding of the present invention, a detailed description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the present invention, but the implementation of the present invention is not limited thereto. These embodiments are provided to provide a more comprehensive and thorough understanding of the disclosure of the present invention.

[0023] In the figures, the same reference numerals represent the same or similar structures, and therefore will not be described again. It should be noted that this specification may use directional terms such as "upper," "lower," and "between," which are only for the convenience of describing the orientation shown in the figures and do not limit the actual direction of the invention. Furthermore, the use of terms such as "first" and "second" is only for distinguishing different features and does not constitute a limitation on the number or importance of features.

[0024] Unless otherwise expressly stated, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for description of specific embodiments only and does not constitute a limitation thereof. The term "and / or" should be interpreted as including any and all combinations of one or more of the associated listed items.

[0025] like Figure 1 , Figure 2As shown, a rotary diffusion device is provided. The diffusion device includes: a fixed driving mechanism, which mainly provides the energy required for rotation; the fixed driving mechanism includes a fixed driving component body 10 and a fixed driving coil 11; the fixed driving component body 10 is a hollow annular structure; the fixed driving component body 11 includes an inner wall and an outer wall; the fixed driving coil 11 is fixedly disposed on the inner wall of the fixed driving component body 10; and the middle region of the fixed driving mechanism is a through hole; a rotating mechanism, which includes a rotating component body 20; the middle region of the rotating component body 20 is a through hole; the rotating mechanism is placed inside the through hole of the fixed driving mechanism, and the fixed driving mechanism can drive the rotating mechanism to rotate in a preset direction; and a diffusion plate 30, which is fixedly disposed in the through hole region of the rotating component body 20. Figure 1 As can be seen, the rotating component body 20 includes an inner wall and an outer wall. The diffuser 30 is fixed to the inner wall of the rotating component body 20 by an adhesive structure 40. When the fixed drive mechanism drives the rotating mechanism to rotate, the diffuser 30 will rotate with the rotating mechanism. In this way, when an external laser light source irradiates the diffuser, the speckle will be greatly reduced or eliminated due to the rotation.

[0026] In one specific embodiment, the diffuser sheet 30 includes a first surface and a second surface disposed opposite to each other. The first surface and / or the second surface of the diffuser sheet 30 are provided with a diffusion structure, wherein the diffusion structure is a randomly arranged microstructure. The diffuser sheet 30 is preferably made of glass, and the microstructure is formed on its surface by an etching process.

[0027] As one specific implementation method, such as Figure 1 as well as Figure 3 As shown, the diffuser 30 is fixed to the through hole of the rotating component body 20 by an adhesive structure 40, which preferably uses thermally conductive adhesive. Figure 3 As can be seen, the bonding structure 40 covers the edge of the diffuser 30 and fixes the diffuser 30 inside the rotating component body 20. Laser or other light can be emitted from the diffuser 30 to reduce or eliminate speckle. Since the diffuser 30 is placed inside, the size of the diffusion device is the same as the size of the fixed drive mechanism, which can greatly reduce the volume and has greater application value in miniaturized devices.

[0028] As one specific implementation method, such as Figure 2 as well as Figure 4 As shown, the diffuser plate 30 is fixed in the through hole of the rotating component body 20 by the fixing structure 50, from... Figure 2As can be seen, four fixing structures 50 are provided on the inner wall of the rotating component body 20. These four fixing structures 50 fix the diffuser 30 in the through hole. The fixing structures 50 can also be three or more. As one specific embodiment, for example… Figure 4 As shown, the fixing structure 50 includes a fixing structure step 501 and a fixing structure snap-fit ​​502. The fixing structure snap-fit ​​502 is matched with the fixing structure step 501. The diffuser 30 is placed at the step of the fixing structure step 501 and fixed by the fixing structure snap-fit ​​502, thus fixing the diffuser 30. In one specific embodiment, the fixing structure 50 is a ring structure, fixed on the wall of the through hole of the rotating component body 20. In this case, the fixing structure 50 is no longer a single structure, but a complete ring structure. In this way, the entire edge of the diffuser 30 can be supported by the fixing structure 50, making the diffuser 30 more stable.

[0029] As one specific implementation method, such as Figure 5 As shown, the rotating component body 20 includes a rotating component step portion 21, which is located on the wall of the through hole of the rotating component body 20. The rotating component step portion 21 includes a rotating component step 210 and a rotating component step retainer 211. The diffuser 10 is placed at the step of the rotating component step 210 and fixed by the rotating component step retainer 211. The rotating component step retainer 211 is matched with the rotating component step 210. In this embodiment, the rotating component step portion is directly formed on the inner wall of the rotating component body 20. The rotating component step 210 supports the installation of the diffuser 30 and is fixed by the rotating component step retainer 211. This structure makes the installation of the diffuser 30 simpler and easier.

[0030] As one specific implementation method, such as Figure 6 As shown, the rotating component body 20 includes a rotating component body extension 22, which is integral with the rotating component body 21. A fluorescent layer 60 is provided on the surface of the rotating component body extension 22 facing the fixed drive component body 10. Figure 6 As shown, the rotating component body extension 22 protrudes significantly from the fixed drive component body 10. A fluorescent layer 60 is provided on the surface of the rotating component body extension 22 away from the through hole, so that the excitation light source can directly irradiate the fluorescent layer 60, and the generated laser light can be mixed with the laser light through the optical path setting to form the emitted light.

[0031] like Figure 7 as well as Figure 8As shown, a structural diagram of another rotary diffusion device is presented, in which... Figure 7 This is a top view. Figure 8 As shown in the cross-sectional view, the diffusion device includes a fixed driving mechanism, which mainly provides the energy required for rotation. The fixed driving mechanism includes a fixed driving component body 10 and a fixed driving coil 11. The fixed driving component body 10 is a hollow annular structure. The fixed driving component body 11 includes an inner wall and an outer wall. The fixed driving coil 11 is fixedly disposed on the outer wall of the fixed driving component body 10. The middle region of the fixed driving mechanism is a through hole. A rotating mechanism includes a rotating component body 20, which includes a rotating component body extension 23. The middle region of the rotating component body 20 is a through hole. The fixed driving mechanism is placed within the through hole of the rotating mechanism and can drive the rotating mechanism to rotate in a preset direction, such as... Figure 8 As shown, the rotating component body extension 23 is an integral structure with the rotating component body 20, and the rotating component body extension 23 protrudes from the fixed drive component body 10; the diffuser 30 is located in the through-hole area in the middle of the rotating component body 20, more precisely, the diffuser 30 is fixed to the inner wall of the rotating component body extension 23 by an adhesive structure 40. Figures 3-6 The same setting method for diffuser 30 or fluorescent sheet 60 is also applicable. Figure 7 , Figure 8 The structure is not elaborated here.

[0032] A light source includes a laser light source emitting device; the laser light source emitting device emits laser light, which passes through the rotary diffusion device. The rotating component in the diffusion device rotates, causing the diffuser to rotate, thereby achieving dynamic speckle treatment. This effectively avoids the speckle problem caused by the fixed directionality of traditional static diffusers and significantly improves the speckle reduction effect. The light source can be a laser light source or a hybrid light source combining laser and fluorescence.

[0033] A projection system includes an optical path system and the light source described above.

[0034] To more clearly illustrate the purpose, features, and advantages of the present invention, the specific embodiments of the invention have been described in detail above with reference to the accompanying drawings, and numerous specific details have been set forth for understanding. However, the present invention can be implemented in many other forms different from those described, and those skilled in the art can make various modifications, variations, or improvements without departing from the core concept of the invention. Furthermore, the technical features in the above embodiments can be combined arbitrarily, and such combinations should be considered within the scope of this specification as long as they do not contradict each other.

[0035] The above embodiments are merely illustrative of several implementations of the present invention, and their descriptions should not be construed as limiting the scope of protection of the present invention. The actual scope of protection of the present invention should be determined by the appended claims.

Claims

1. A rotary diffusion device, comprising: A fixed drive mechanism includes a fixed drive component body, which is a hollow annular structure. The fixed drive component body includes an inner wall and an outer wall, wherein the middle region of the fixed drive mechanism is a through hole. A rotating mechanism includes a rotating component body, the middle region of which is a through hole. The rotating mechanism is matched with a fixed driving mechanism, and the fixed driving mechanism can drive the rotating mechanism to rotate in a preset direction. A diffuser plate is fixedly disposed in the through-hole area in the middle of the rotating component body.

2. The rotary diffusion device according to claim 1, characterized in that, The rotating mechanism is placed inside the through hole of the fixed drive mechanism.

3. The rotary diffusion device according to claim 1, characterized in that, The diffuser sheet includes a first surface and a second surface disposed opposite to each other, and the first surface and / or the second surface of the diffuser sheet are provided with a diffusion structure.

4. A rotary diffusion device according to claim 2, characterized in that, The diffuser sheet is fixed to the through hole of the rotating component body by an adhesive structure.

5. A rotary diffusion device according to claim 2, characterized in that, The diffuser sheet is fixed in the through hole of the rotating component body by a fixing structure.

6. A rotary diffusion device according to claim 5, characterized in that, The fixing structure includes a fixing structure step and a fixing structure snap-fit, and the diffuser is placed at the fixing structure step and fixed by the fixing structure snap-fit.

7. A rotary diffusion device according to claim 5, characterized in that, The fixing structure is a ring-shaped structure, which is fixed on the wall of the through hole of the rotating component body.

8. A rotary diffusion device according to claim 2, characterized in that, The rotating component body includes a rotating component step portion, which is located on the wall of the through hole of the rotating component body; wherein, the rotating component step portion includes a rotating component step and a rotating component step retaining member, and the diffuser is placed at the rotating component step and fixed by the rotating component step retaining member.

9. A rotary diffusion device according to claim 2, characterized in that, The rotating component body includes a rotating component body extension, which is an integral structure with the rotating component body. The rotating component body extension has a fluorescent layer on its surface facing the fixed drive component body.

10. A rotary diffusion device according to claim 1, characterized in that, The fixed drive mechanism is placed in the through hole of the rotating mechanism, wherein the rotating component body includes a rotating component body extension, the rotating component body extension and the rotating component body are integrally formed, and the diffuser is fixedly disposed on the inner wall of the rotating component body extension.

11. A light source, comprising a laser light source emitting device and a rotating diffusion device as described in any one of claims 1 to 10.

12. A projection system comprising an optical path system and the light source of claim 11.

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