Reflective diffusion device and projection device

Abstract

The present application provides a reflection diffusion device, which includes a driving element, a reflecting element and a diffusion element, for reflecting and diffusing a laser beam emitted from a light source module. The driving element has a rotation shaft. The reflecting element includes a central axis and is arranged on the driving element. The central axis is collinear with the rotation shaft. The diffusion element is arranged on at least a portion of the reflecting element, wherein the driving element is used to drive the reflecting element and the diffusion element to rotate around the central axis. The laser beam is incident on the diffusion element along an incident direction and is transmitted to the reflecting element, is reflected by the reflecting element and is emitted from the diffusion element along an emitting direction to form a diffusion beam. The incident direction and the central axis have an incident included angle, and the emitting direction and the central axis have an emitting included angle. The incident included angle is greater than 0 degrees, and the emitting included angle is greater than or equal to 0 degrees. The reflection diffusion device and the projection device of the present application are helpful for the use in space.

Description

Technical Field

[0001] This invention relates to a beam diffusion device and a projection device, and particularly to a reflective diffusion device and a projection device. Background Technology

[0002] Projection imaging devices that use lasers as a light source (such as projectors) often suffer from speckle problems that affect image quality. To eliminate laser speckle, projection devices typically employ static diffusers or high-speed rotating penetrating diffusers. When the laser passes through the diffuser or diffuser, its energy density decreases, resulting in scattered laser light, thus eliminating concentrated speckles. However, in such projection devices, the incident and emitted lasers are located on opposite sides of the penetrating diffuser or diffuser, which limits the beam path layout and is not conducive to spatial utilization.

[0003] The "Background Art" paragraph is only used to help understand the content of this invention. Therefore, the content disclosed in the "Background Art" paragraph may include some prior art that is not known to those skilled in the art. The content disclosed in the "Background Art" paragraph does not mean that the content or the problem to be solved by one or more embodiments of this invention was known or recognized by those skilled in the art before this application was filed. Summary of the Invention

[0004] This invention provides a reflective diffusion device that is helpful for space utilization.

[0005] Other objects and advantages of the present invention can be further understood from the technical features disclosed herein.

[0006] To achieve one, some, or all of the above-mentioned objectives, or other objectives, an embodiment of the present invention provides a reflective diffusion device for reflecting and diffusing a laser beam emitted from a light source module. The reflective diffusion device includes a driving element, a reflector, and a diffuser. The driving element has a rotating shaft. The reflector includes a central axis and is disposed on the driving element, the central axis being collinear with the rotating shaft. The diffuser is disposed on at least a portion of the reflector, wherein the driving element is used to drive the reflector and the diffuser to rotate about the central axis. The laser beam is incident on the diffuser along the incident direction and transmitted to the reflector, reflected by the reflector, and exits the diffuser along the exit direction to form a diffused beam. An incident angle is formed between the incident direction and the central axis, and an exit angle is formed between the exit direction and the central axis, the incident angle being greater than 0 degrees and the exit angle being greater than or equal to 0 degrees.

[0007] An embodiment of the present invention also provides a projection device, which includes an illumination module, a light valve, and a projection lens. The illumination module provides an illumination beam. The light valve is disposed in the path of the illumination beam to convert the illumination beam into an image beam. The projection lens is disposed in the path of the image beam to project the image beam out of the projection device. The illumination module includes a light source module, a reflective diffuser, and a wavelength conversion device. The light source module emits a laser beam. The reflective diffuser includes a driving element, a reflector, and a diffuser. The driving element has a rotating shaft. The reflector includes a central axis and is disposed on the driving element, the central axis being collinear with the rotating shaft. The diffuser is disposed on at least a portion of the reflector, wherein the driving element drives the reflector and the diffuser to rotate around the central axis. The laser beam is incident on the diffuser along the incident direction and transmitted to the reflector, reflected by the reflector, and exits the diffuser along the exit direction to form a diffused beam. An incident angle is formed between the incident direction and the central axis, and an exit angle is formed between the exit direction and the central axis, the incident angle being greater than 0 degrees and the exit angle being greater than or equal to 0 degrees. A wavelength conversion device is positioned in the path of the diffused beam to convert it into a converted beam. The converted beam from the illumination module is then transmitted as the illumination beam provided by the illumination module.

[0008] Based on the above, the reflective diffusion device of the present invention includes a driving element, a reflector, and a diffuser, which is adapted to reflect and diffuse the laser beam emitted by the light source module. The driving element drives the reflector and the diffuser to rotate around the central axis of the reflector. Through the cooperation of the reflector and the diffuser, the incident laser beam and the emitted diffused beam are located on the same side of the reflective diffusion device, which helps in space utilization and increases the flexibility in light path design. In addition, the laser beam passes through the diffuser at least twice, achieving a better beam diffusion effect. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of a projection device according to an embodiment of the present invention.

[0010] Figure 2A yes Figure 1 A three-dimensional schematic diagram of part of the lighting module of the projection device.

[0011] Figure 2B yes Figure 2A An explosion diagram.

[0012] Figure 2C yes Figure 2A A schematic diagram of a cross section along section AA.

[0013] Figure 2D yes Figure 2A A magnified view of a portion of the image.

[0014] Figure 3AThis is a perspective view of a portion of the lighting module according to another embodiment of the present invention.

[0015] Figure 3B yes Figure 3A An explosion diagram.

[0016] Figure 3C yes Figure 3A A schematic diagram of a cross section along the BB line.

[0017] Figure 4A This is a perspective view of a portion of the lighting module according to another embodiment of the present invention.

[0018] Figure 4B yes Figure 4A An explosion diagram.

[0019] Figure 4C yes Figure 4A A schematic diagram of a cross section along the CC line.

[0020] Figure 5A This is a perspective view of a portion of the lighting module according to another embodiment of the present invention.

[0021] Figure 5B yes Figure 5A An explosion diagram.

[0022] Figure 6A yes Figure 5A Top view of the first time sequence.

[0023] Figure 6B yes Figure 5A A cross-sectional view of the first time sequence.

[0024] Figure 7A yes Figure 5A Top view of the second time sequence.

[0025] Figure 7B yes Figure 5A A cross-sectional schematic diagram of the second time sequence. Detailed Implementation

[0026] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying views. The directional terms mentioned in the following embodiments (e.g., up, down, left, right, front, or back) are only for reference to the accompanying views. Therefore, the directional terms used are for illustrative purposes and not for limiting the present invention.

[0027] Figure 1 This is a schematic diagram of a projection device according to an embodiment of the present invention. Please refer to [link / reference]. Figure 1The projection device 10 includes an illumination module 100, a light valve 200, and a projection lens 300. The projection device 10 is used to convert the illumination beam L3 into an image beam L4 and project the image beam L4 out of the projection device 10.

[0028] The illumination module 100 includes a light source module 110, a reflective diffusion device 120, and a wavelength conversion device 130. The illumination module 100 is used to provide an illumination beam L3. The light source module 110 is used to emit a laser beam L1. In this embodiment, the light source module 110 is, for example, one or more laser light-emitting elements. The laser emitted by the light source module 110 is, for example, blue light, but it can also be a beam of other colors; the invention is not limited thereto.

[0029] The reflective diffuser 120 is adapted to reflect and diffuse the laser beam L1 emitted from the light source module 110 to form a diffused beam L2. Generally, lasers have high energy density and are prone to forming concentrated spots, which affects image quality. After the laser beam L1 from the light source module 110 passes through the reflective diffuser 120, it diverges into a diffused beam L2, thereby reducing the energy density and achieving the effect of eliminating speckle.

[0030] A wavelength conversion device 130 is disposed on the transmission path of the diffused beam L2 to convert the diffused beam into a converted beam. The wavelength conversion device 130 is, for example, a phosphor wheel and may be configured with at least one wavelength conversion region and at least one non-wavelength conversion region. The at least one wavelength conversion region and the at least one non-wavelength conversion region may alternately enter the transmission path of the diffused beam L2. The at least one wavelength conversion region may be provided with phosphor. When the at least one wavelength conversion region enters the transmission path of the diffused beam L2, the incident diffused beam L2 can be converted into a converted beam of different wavelengths, for example, converting a blue diffused beam L2 into a yellow converted beam. The wavelength type is not limited to this and can be adjusted according to design requirements. The converted beam is then continuously transmitted out of the illumination module 100, and at this time, the converted beam serves as the illumination beam L3 provided by the illumination module 100. When at least one non-wavelength conversion region enters the transmission path of the diffuse beam L2, the diffuse beam L2 may be reflected or penetrated by the non-wavelength conversion region and transmitted out of the lighting module 100. In this sequence, the diffuse beam L2 serves as the lighting beam L3 provided by the lighting module 100. That is, the lighting beam L3 may be a conversion beam or a diffuse beam L2 in different sequences.

[0031] A light valve 200 is positioned in the path of the illumination beam L3 to convert the illumination beam L3 into an image beam L4. In this embodiment, the light valve 200 is, for example, a reflective light modulator such as a digital micromirror device (DMD) or a liquid crystal on silicon panel (LCoS panel). In some embodiments, the light valve 200 may be, for example, a transmissive light modulator such as a liquid crystal display panel, an electro-optic modulator, a magneto-optic modulator, or an acousto-optic modulator (AOM). However, the invention is not limited to these. Of course, the light valve 200 may also be other optical lenses, etc., and the invention is not limited to these.

[0032] The projection lens 300 is positioned in the path of the image beam L4 from the light valve 200 to project the image beam L4 out of the projection device 10 and display it on a screen, wall, or other projection target. In this embodiment, the projection lens 300 may include, for example, a combination of one or more reflective optical lenses with refractive power, such as various combinations of reflective lenses like biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. In one embodiment, the projection lens 300 may also include a planar optical lens to project the image beam L4 from the light valve 200 out of the projection device 10 by reflection or transmission.

[0033] Figure 2A yes Figure 1 A three-dimensional schematic diagram of part of the lighting module 100 of the projection device. Figure 2B yes Figure 2A An explosion diagram. It should be noted that... Figure 2B The light source module and the first lens are hidden.

[0034] Please see Figures 2A to 2B In this embodiment, the reflective diffusion device 120 includes a driving element 126 and a reflector 140. Figure 2B The driving element 126 has a rotating shaft 1261, and the reflector 140 is one end 1262 of the driving element 126. Figure 2BThe reflector 140 is, for example, a reflective surface of end 1262 facing the light source module 110. In this embodiment, end 1262 is made of metal, for example. The reflector 140 has a central axis AX. The outer diameter of the reflector 140 is equal to the outer diameter of end 1262 of the drive element 126. The central axis AZ is collinear with the rotating shaft 1261.

[0035] The reflector 140 (end 1262) is used to reflect the laser beam L1 emitted by the light source module 110. Figure 1 and Figure 2C It can be an annular heat dissipation end, and the diffuser 124 is connected to the adhesive layer 180 ( Figure 2B The rotating shaft 1261 is sleeved on the driving element 126. In this embodiment, the reflective diffusion device 120 may further include an annular reflective layer 122, which is coated on the end 1262 of the driving element 126 and surrounds the rotating shaft 1261 and is located between the reflector 140 (end 1262) and the diffuser 124. The material of the reflective layer may be a plated dielectric material, silver or aluminum, or a mixture of organic and inorganic adhesives to reflect particles. Of course, the structure and material of the reflective layer 122 are not limited to these.

[0036] In this embodiment, the adhesive layer 180 is, for example, a coating layer or an adhesive layer, used to fix the diffuser 124 to the reflective layer 122 and / or the reflective element 140 (end 1262), but the type of adhesive layer 180 is not limited to this.

[0037] A diffuser 124 is disposed on at least a portion of the reflector 140, and the outer diameter of the diffuser 124 is less than or equal to the outer diameter of the reflector 140. The diffuser 124 is conformally disposed to the reflector 140, for example, by coating, pasting, or back-coating. For example, the reflector 140 may include at least a portion of a plane, a bowl-shaped surface, or a conical surface (at least a portion of a conical surface refers to an annular conical surface formed by removing the apex of a cone), and therefore the diffuser 124 conforms to at least a portion of the plane, bowl-shaped surface, or conical surface of the reflector 140. Of course, the geometry of the reflector 140 and the diffuser 124 is not limited thereto. In this embodiment, the reflector 140 (end 1262) is a planar element, and the diffuser 124 is conformally disposed on the planar reflector 140 (end 1262).

[0038] The diffuser 124 can be a light-transmitting material with microstructures on its surface, or a fogging layer containing scattering particles, or a combination of the above-mentioned light-transmitting material and fogging layer, used to diffuse the laser beam L1 emitted by the light source module 110. Figure 1The diffuser 124 can be manufactured by methods such as glass etching, mixing the diffuser material with organic adhesive, or mixing the diffuser material with inorganic adhesive, and the diffuser material can be silicon dioxide or ceramic. Of course, the material and structure of the diffuser 124 are not limited to these and depend on the design requirements.

[0039] In this embodiment, the driving element 126 is, for example, a motor. The driving element 126 is used to drive the reflector 140 and the diffuser 124 to rotate around the central axis AX, so that the laser beam L1 of the incident reflective diffuser 120 forms a diffused beam L2. Figure 1 ).

[0040] Figure 2C yes Figure 2A A schematic cross-sectional view along section AA. Please refer to [link / reference]. Figure 2C Specifically, the light source module 110 is positioned above the diffuser 124, meaning the diffuser 124 is located between the reflector 140 and the light source module 110. The laser beam L1 is emitted from the light source module 110, first incident along the incident direction D1 at position P of the diffuser 124, and then transmitted to the reflector 140. Figure 2B The light beam L2 is formed by being reflected by the reflector 140 and emitted in the emission direction D2 to the diffuser 124.

[0041] On the other hand, in this embodiment, the incident direction D1 has an incident angle θi with the central axis AX, while the exit direction D2 has an exit angle θo with the central axis AX. To facilitate the presentation of the incident and exit angles, Figure 2C An auxiliary line AL is drawn, parallel to the central axis AX and passing through position P. The incident angle θi is the angle between the incident direction D1 and the auxiliary line AL, while the exit angle θo is the angle between the exit direction D2 and the auxiliary line AL. In this embodiment, the incident angle θi is greater than 0 degrees and the exit angle θo is greater than or equal to 0 degrees. The laser beam L1 is incident on the diffuser 124, for example, with an incident angle θi of 3 to 87 degrees, thereby effectively eliminating the concentrated spot (speck phenomenon) caused by the laser beam L1. In addition, by adjusting the degree of the incident angle θi, the exit angle θo can be adjusted, which is beneficial to the flexibility of beam path design.

[0042] It is worth noting that, thanks to the beam reflection design, the incident direction D1 and the exit direction D2 of the laser beam L1 are both located on the same side of the reflective diffuser 120, and it does not penetrate the reflective diffuser 120. This saves space in the direction of the central axis AX, making the internal space utilization of the projection device 10 more flexible. Actual testing shows that the volume of the projection device 10 can be reduced by more than 10% compared to existing projection devices, thus helping to reduce weight and cost.

[0043] Figure 2Dyes Figure 2A A magnified view of a portion of the image. Please refer to the diagram. Figure 2D Furthermore, the laser beam L1 passes through the diffuser 124 during both its incidence and exit from the reflector 140. For example, the laser beam L1, when collimated, enters the diffuser 124 and forms a beam with a diffusion angle of, for example, 1.5 degrees. When the laser beam L1 enters and exits from position P, it passes through the diffuser 124 twice; that is, the diffused beam L2 is formed by the laser beam L1 undergoing two diffusions, and the exiting diffused beam L2 has a diffusion angle of 3 degrees. Of course, the diffusion angle of the beam passing through the diffuser 124 is not limited to this and depends on the design requirements. Therefore, the illumination module 100 only needs to provide a single diffuser 124, and the diffusion angle of the incident beam can be twice that of a through-beam diffuser or diffuser wheel, forming a diffused beam L2 with sufficient diffusion effect to effectively avoid speckle formation.

[0044] Please return Figure 2C In existing projection devices, the radial dimension of the penetrating diffuser or diffuser wheel must be larger than the radial dimension of the driving element to prevent the driving element from obstructing the travel of the laser beam penetrating the diffuser or diffuser wheel. In contrast, the laser beam L1 in this embodiment does not penetrate the reflector 140 and the diffuser 124, so the driving element 126 located below the reflector 140 and the diffuser 124 will not obstruct the travel of the laser beam L1. Therefore, the size of the diffuser 124 can be significantly reduced. Actual measurements show that compared to existing penetrating diffusers or diffuser wheels, the volume of the diffuser 124 in the reflective diffuser device 120 can be reduced by more than 30%, thereby contributing to space utilization and cost savings.

[0045] After the diffused beam L2 leaves the reflective diffuser 120, it enters and passes through the first lens 160. The first lens 160 is positioned above the diffuser 124 and on the transmission path of the diffused beam L2, but not on the transmission path of the laser beam L1. The first lens 160 may be, for example, a collimating lens, which can convert the diffused beam L2 into a parallel beam, but the type and function of the first lens 160 are not limited to this. After passing through the first lens 160, the diffused beam L2 enters a subsequent optical path system (not shown) for further use and processing.

[0046] Figure 3A This is a perspective view of a portion of the lighting module according to another embodiment of the present invention. Figure 3B yes Figure 3A An explosion diagram. It should be noted that... Figure 3B The light source module and lenses are hidden. Please refer to [link / reference]. Figure 3A and Figure 3BThe lighting module 100A in this embodiment is similar to the aforementioned lighting module 100, except that the reflective diffuser 120A of the lighting module 100A includes a reflector 140' and an adapter 170. In this embodiment, the reflector 140' is an independent heat dissipation substrate, and the diffuser 124 is connected by an adhesive layer 180 ( Figure 3B The reflector 140' is fixed to the side of the reflector facing the light source module 110, and the reflector 140' is fixed to the end 1262 of the drive element 126 by the adhesive layer 180. Figure 2B ).

[0047] The reflector 140' in this embodiment can be made of ceramic, metal, or composite material, to reflect the laser beam L1 ( Figure 1 The heat generated by the incident light on the reflector 140' is dissipated to prevent the drive element 126 from overheating and being damaged or ceasing operation. However, the structure and material of the reflector 140' are not limited to this. Furthermore, the reflector 140' can be formed by processes such as stamping, machining, casting, die casting, or injection molding, but the forming method of the reflector 140' is not limited to these. In other embodiments, the reflective diffusion device 120A may also include a reflective layer 122, which is disposed between the reflector 140' and the diffuser 124 to enhance the light reflection effect of the reflector 140'.

[0048] It is worth mentioning that the rotating shaft 1261 of the driving element 126 in the reflective diffusion device 120 of the aforementioned lighting module 100 has a heat dissipation effect, but the heat dissipation effect is limited. In this embodiment, the outer diameter of the reflector 140' configured in the reflective diffusion device 120A is greater than or equal to the outer diameter of the driving element 126, resulting in a larger heat dissipation area and a better heat dissipation effect compared to the aforementioned lighting module 100.

[0049] The adapter 170 is connected to the drive element 126 and fixed to the diffuser 124 facing the light source module 110 by an adhesive layer 180. The adapter 170 has a balancing function. Specifically, the adapter 170 is used to fill adhesive or metal to balance the eccentricity of the reflective diffuser 120A during rotation, and to correct and fix the element as a frame. Furthermore, the adapter 170 strengthens the attachment between the diffuser 124 and the drive element 126, and there is a radial gap (not shown) between the adapter 170 and the diffuser 124, thus preventing the diffuser 124 from cracking due to thermal expansion and contraction pressing against the drive element 126.

[0050] Figure 3C yes Figure 3AA cross-sectional view along line BB. Similar to the reflection and diffusion method of the aforementioned reflective diffusion device 120, the laser beam L1 in the reflective diffusion device 120A of this embodiment is emitted by the light source module 110, first incident along the incident direction D1 onto position P of the diffuser 124 and then transmitted to the reflector 140'. Figure 2B The light beam is reflected by the reflector 140' and emitted along the emission direction D2 to the diffuser 124, thereby forming a diffused beam L2.

[0051] Figure 4A This is a perspective view of a portion of the lighting module according to another embodiment of the present invention. Figure 4B yes Figure 4A An explosion diagram. It should be noted that... Figure 4B The light source module and lenses are hidden. Please refer to [link / reference]. Figure 4A and Figure 4B The lighting module 100B of this embodiment is similar to the aforementioned lighting module 100, except that the reflective diffuser 120B of the lighting module 100B does not have a driving element 126 and has a reflector 140A. In other words, during the operation of the lighting module 100B, the reflector 140A of the reflective diffuser 120B ( Figure 4B The reflective diffuser 120B of the lighting module 100B remains stationary with the diffuser 124B. Since the reflective diffuser 120B of the lighting module 100B does not have a driving element 126 and does not need to have an adapter 170, space and cost can be further saved.

[0052] Figure 4C yes Figure 4A A cross-sectional view along the CC line. Similar to the reflection and diffusion method of the aforementioned reflective diffusion device 120, the laser beam L1 is emitted by the light source module 110, first enters the diffuser 124B at position P along the incident direction D1 and is transmitted to the reflector 140A. After being reflected by the reflector 140A, it exits the diffuser 124B in the exit direction D2 to form the diffused beam L2.

[0053] In this embodiment, the diffuser 124B is fixed to the side of the reflector 140A facing the light source module 110. By using the reflector 140A, the heat generated by the laser beam L1 incident on the reflector 140A can be dissipated, thus preventing overheating of the reflective diffuser 120B. In other embodiments, the reflective diffuser 120B may further include a reflective layer 122B, which is disposed between the reflector 140A and the diffuser 124B to enhance the light reflection effect of the reflector 140A.

[0054] Figure 5A This is a perspective view of a lighting module according to another embodiment of the present invention. Figure 5B yes Figure 5A An explosion diagram. It should be noted that... Figure 5B The light source module, lenses, and wavelength conversion device are concealed. Please refer to [link / reference]. Figure 5A and Figure 5B The lighting module 100C in this embodiment is similar to the aforementioned lighting module 100A. The difference is that the reflector 140B of the reflective diffuser 120C is at least a portion of a conical surface, where at least a portion of the conical surface refers to the annular conical surface formed by removing the apex of the cone. The diffuser 124C conforms to the reflector 140B, and its shape is also at least a portion of a conical surface.

[0055] The reflector 140B includes a first opening H1, and the diffuser 124C includes a second opening H2 corresponding to the first opening H1. Figure 5B The adhesive layer 180 also has openings corresponding to the first opening H1 and the second opening H2. It should be noted that in this embodiment, the area of ​​the first opening H1 is equal to the area of ​​the second opening H2, but the size relationship between the two is not limited to this and depends on the actual design requirements.

[0056] In this embodiment, the illumination module 100C further includes a wavelength conversion device 130. The wavelength conversion device 130 includes a wavelength conversion region 1301, which is, for example, configured with a yellow phosphor region to excite yellow light, but the wavelength conversion type is not limited to this. In other embodiments, the reflective diffusion device 120C may also include a reflective layer 122C, disposed between the reflector 140B and the diffuser 124C, to enhance the light reflection effect of the reflector 140B. The reflective layer 122C also has openings corresponding to the first opening H1 and the second opening H2.

[0057] Figure 6A yes Figure 5A Top view of the first time sequence. Figure 6B yes Figure 5A A cross-sectional view of the first time sequence. Figure 7A yes Figure 5A Top view of the second time sequence. Figure 7B yes Figure 5A A cross-sectional view of the second time sequence. To clearly illustrate the reflective diffuser 120C, Figure 6A The wavelength conversion device 130 is concealed. To clearly present the reflective diffuser 120C, Figure 7A The wavelength conversion device 130 is concealed. See also... Figure 6A and Figure 6B In this embodiment, when the laser beam L1 from the light source module 110 ( Figure 6B When the incident light is emitted through the reflective diffuser 120C, it can pass directly through the reflective diffuser 120C. At this time, the laser beam L1 serves as the illumination beam L3 provided by the illumination module 100C. Figure 1Alternatively, when the laser beam L1 from the light source module 110 is incident on the reflective diffuser 120C, it can form a diffused beam L2 without penetrating the reflective diffuser 120C. Figure 7B ), and the diffused beam L2 re-incident wavelength conversion device 130 ( Figure 6B ) and is converted into a converted beam of different wavelengths L5 ( Figure 7B At this time, the conversion beam L5 is used as the illumination beam L3 provided by the illumination module 100C.

[0058] Please see Figure 6B Specifically, the reflective diffuser 120C is driven by the driving element 126 to rotate the reflector 140B and the diffuser 124C around the central axis AX. At the first timing T1, the first opening H1 and the second opening H2 are located on the transmission path of the laser beam L1. The light source module 110 emits the laser beam L1, which enters the reflective diffuser 120C along the incident direction D1, passes through the second opening H2 and the first opening H1, and leaves the reflective diffuser 120C.

[0059] In this embodiment, the illumination module 100C further includes a second lens 162, which is disposed on the transmission path of the laser beam L1. In the first timing sequence, the second lens 162, the light source module 110, the first opening H1, and the second opening H2 form a line, that is, the second lens 162, the first opening H1, and the second opening H2 are located on the incident direction D1 of the laser beam L1. After the laser beam L1 leaves the reflective diffuser 120C, it penetrates the second lens 162 and then enters the subsequent optical path system for further application and processing. In this timing sequence, the laser beam L1 serves as the illumination beam L3 provided by the illumination module 100C. Figure 1 In this embodiment, the second lens 162 and the first lens 160 can be the same lens or different lenses.

[0060] Please see Figure 7A In the second timing sequence, the first opening H1 ( Figure 7B The first opening H1 and the second opening H2 are rotated away from the first lens 160, so that the first opening H1 and the second opening H2 are not in the laser beam L1. Figure 7B The transmission path of ).

[0061] Please see Figure 7BAt the second time step T2, when the laser beam L1 is incident on the reflective diffuser 120C along the incident direction D1, it does not pass through the first opening H1 and the second opening H2. Instead, the laser beam L1 is incident on the diffuser 124C at position P and transmitted to the reflector 140B. After being reflected by the reflector 140B, it exits the diffuser 124C along the exit direction D2 to form the diffused beam L2. Furthermore, in this embodiment, the wavelength conversion device 130 rotates synchronously with the driving element 126, and the wavelength conversion region 1301 ( Figure 5A In the second timing sequence, the diffused beam L2 is inserted into the transmission path of the wavelength conversion device 130, so that the diffused beam L2 enters the wavelength conversion region 1301 of the wavelength conversion device 130, and is then converted into a converted beam L5, for example, yellow. In this timing sequence, the converted beam L5 serves as the illumination beam L3 provided by the illumination module 100C. Figure 1 ).

[0062] In this embodiment, the wavelength conversion region 1301 corresponds to the area of ​​the reflector 140B without the first opening H1 and the area of ​​the diffuser 124C without the second opening H2. Therefore, the distribution range of the wavelength conversion region 1301 can be determined according to the size of the first opening H1 and the second opening H2. In the region of the wavelength conversion device 130 corresponding to the first opening H1 and the second opening H2, the wavelength conversion region 1301 is not provided to further save costs.

[0063] In this embodiment, the illumination module 100C has an opening design through the reflector 140B and the diffuser 124C. When the diffusion of the laser beam L1 is not required, the laser beam L1 can directly pass through the reflective diffuser 120C and exit for further use and processing. When the diffusion of the laser beam L1 is required, the laser beam L1 enters the reflective diffuser 120C and undergoes two diffusions through the diffuser 124C to become a diffused beam L2 with a good diffusion effect. Then, it enters the wavelength conversion device 130 and is converted into a converted beam L5 with a different wavelength. In other words, through the synchronous cooperation of the reflective diffuser 120C and the wavelength conversion device 130, the illumination module 100C can emit different illumination beams L3 at different times, and improves the flexibility of beam path design.

[0064] In summary, the reflective diffusion device of the present invention includes a driving element, a reflector, and a diffuser, which is suitable for reflecting and diffusing the laser beam emitted by the light source module. The driving element drives the reflector and the diffuser to rotate around the central axis of the reflector. Through the cooperation of the reflector and the diffuser, the incident laser beam and the emitted diffused beam are located on the same side of the reflective diffusion device, which helps in space utilization and increases the flexibility in light path design. In addition, the laser beam passes through the diffuser at least twice, achieving a better beam diffusion effect.

[0065] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. Any simple equivalent changes and modifications made in accordance with the claims and specification of the present invention are still within the scope of this patent. Furthermore, no embodiment or claim of the present invention needs to achieve all the objectives, advantages, or features disclosed in the present invention. In addition, the abstract and title of the invention are used only to assist in patent document retrieval and are not intended to limit the scope of the invention. Furthermore, the terms "first," "second," etc., mentioned in this specification or claims are only used to name elements or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements. List of reference numerals AA, BB, CC: Section lines AL: Auxiliary lines AX: Central axis D1: Incident direction D2: Launch direction L1: Laser beam L2: Diffused beam L3: illumination beam L4: Image Beam L5: Beam Conversion P: Location T1: First timing sequence T2: Second timing sequence θi: Angle of incidence θo: Angle of exit 10: Projection device 100, 100A, 100B, 100C: Lighting modules 110: Light source module 120, 120A, 120B, 120C: Reflective diffusion devices 122, 122A, 122B, 122C: Reflective layer 124, 124A, 124B, 124C: Diffuser 126: Driving element 1261: Shaft 1262:End 130: Wavelength conversion device 1301: Wavelength conversion region 140, 140', 140A, 140B: Reflectors 160: First Lens 162: Second lens 170: Adapter 180: Adhesive layer 200: Light valve 300: Projection lens.

Claims

1. A reflective diffusion device, characterized in that, The reflective diffusion device is used to reflect and diffuse the laser beam emitted from the light source module. The reflective diffusion device includes: a driving element, a reflective element, and a diffuser element; wherein, The driving element has a rotating shaft; The reflector includes a central axis and is disposed on the driving element; the reflector includes a first opening; the central axis is collinear with the rotating shaft; and The diffuser is disposed on at least a portion of the reflector. The diffuser includes a second opening corresponding to the first opening. The first opening and the second opening are located on the transmission path of the laser beam. The driving element is used to drive the reflector and the diffuser to rotate around the central axis. The laser beam is incident on the diffuser along the incident direction and transmitted to the reflector. After being reflected by the reflector, it is emitted from the diffuser along the emission direction to form a diffused beam. There is an incident angle between the incident direction and the central axis, and there is an emission angle between the emission direction and the central axis. The incident angle is greater than 0 degrees and the emission angle is greater than or equal to 0 degrees. In a first timing sequence, the laser beam passes through the second opening and the first opening. In a second timing sequence, the laser beam is incident on the diffuser and transmitted to the reflector. After being reflected by the reflector, it is emitted from the diffuser.

2. The reflective diffusion device according to claim 1, characterized in that, The reflector includes at least a portion of a conical surface or a bowl-shaped surface, wherein the diffuser conforms to at least a portion of the conical surface or the bowl-shaped surface of the reflector.

3. The reflective diffusion device according to claim 1, characterized in that, The reflector is one end of the driving element and surrounds the rotating shaft.

4. The reflective diffusion device according to claim 1, characterized in that, The reflector is a ring-shaped heat dissipation substrate, which is sleeved on the rotating shaft of the driving element.

5. The reflective diffusion device according to claim 4, characterized in that, The outer diameter of the reflector is greater than or equal to the outer diameter of the driving element.

6. The reflective diffusion device according to claim 1, characterized in that, The outer diameter of the diffuser is less than or equal to the outer diameter of the reflector.

7. The reflective diffusion device according to claim 1, characterized in that, The diffuser includes microstructures located on its surface, and / or the diffuser includes an atomizing layer with scattering particles inside.

8. A projection device, characterized in that, The projection device includes: an illumination module, a light valve, and a projection lens. The illumination module provides an illumination beam, the light valve is positioned in the path of the illumination beam to convert it into an image beam, and the projection lens is positioned in the path of the image beam to project the image beam out of the projection device. The illumination module includes a light source module, a reflective diffusion device, and a wavelength conversion device. The light source module is used to emit a laser beam; The reflective diffusion device includes: a driving element, a reflector, and a diffuser; wherein... The driving element has a rotating shaft; The reflector includes a central axis and is disposed on the driving element; the reflector includes a first opening; the central axis is collinear with the rotating shaft; and The diffuser is disposed on at least a portion of the reflector, the diffuser including a second opening corresponding to the first opening, the first opening and the second opening being located on the transmission path of the laser beam, wherein the driving element is used to drive the reflector and the diffuser to rotate around the central axis, the laser beam is incident on the diffuser along the incident direction and transmitted to the reflector, reflected by the reflector and exiting the diffuser along the exit direction to form a diffused beam, the incident direction having an incident angle with the central axis, the exit direction having an exit angle with the central axis, the incident angle being greater than 0 degrees and the exit angle being greater than or equal to 0 degrees, wherein, in a first timing sequence, the laser beam passes through the second opening and the first opening, and in a second timing sequence, the laser beam is incident on the diffuser and transmitted to the reflector, reflected by the reflector and exiting the diffuser; and The wavelength conversion device is disposed in the path of the diffused beam to convert the diffused beam into a converted beam, wherein the converted beam transmitted from the illumination module serves as the illumination beam provided by the illumination module.

9. The projection device according to claim 8, characterized in that, The reflector includes at least a portion of a conical surface or a bowl-shaped surface, wherein the diffuser conforms to at least a portion of the conical surface or the bowl-shaped surface of the reflector.

10. The projection device according to claim 8, characterized in that, The reflector is one end of the driving element and surrounds the rotating shaft.

11. The projection device according to claim 8, characterized in that, The reflector is a ring-shaped heat dissipation substrate, which is sleeved on the rotating shaft of the driving element.

12. The projection device according to claim 11, characterized in that, The outer diameter of the reflector is greater than or equal to the outer diameter of the driving element.

13. The projection device according to claim 8, characterized in that, The outer diameter of the diffuser is less than or equal to the outer diameter of the reflector.

14. The projection device according to claim 8, characterized in that, The diffuser includes microstructures located on its surface, and / or the diffuser includes an atomizing layer with scattering particles inside.

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