Light source device and optical imaging system

Abstract

This application discloses a light source device and an optical imaging system. An excitation light source is used to generate excitation light. A fluorescence generator is used to generate fluorescence under the excitation light. A supplementary light source is used to generate supplementary light. A first functional part of a light recovery unit is used to reflect a first sub-fluorescence back to the fluorescence generator, and a second functional part of the light recovery unit is used to transmit a second sub-fluorescence. A light combining unit is used to combine the supplementary light and the second sub-fluorescence transmitted through the light recovery unit to generate emitted light. A third functional part of the light combining unit is used to emit the supplementary light in a specified direction, and the second sub-fluorescence is also emitted in a specified direction. Because the third functional part and the first functional part correspond to each other in the optical path, the light recovery unit can reflect the first sub-fluorescence back to the fluorescence generator, preventing it from directly participating in subsequent light combining. Instead, it is emitted again at the fluorescence generator in a near-Lambertian emission manner, reducing fluorescence combining loss and improving combining efficiency.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and more specifically, to a light source device and an optical imaging system. Background Technology

[0002] Currently, the main light source used in projection devices is the RGB laser light source, which has advantages such as high brightness, wide color gamut, and good monochromaticity. However, for projection devices using small F-number lenses, RGB laser light sources cannot provide significant brightness gain.

[0003] To address these issues, researchers proposed a hybrid light source combining laser and fluorescence (e.g., LED), which enhances the brightness of the projection device by incorporating a fluorescent light source into the laser source. However, when the laser and fluorescent light sources are combined using a beam combiner (e.g., a beam combiner mirror), the fluorescent light source experiences some beam combining loss, reducing the beam combining efficiency of the projection device. Summary of the Invention

[0004] This application provides a light source device and an optical imaging system.

[0005] According to a first aspect of this application, embodiments of this application provide a light source device, which includes an excitation light source, a fluorescence generator, a supplementary light source, a light recovery unit, and a light combining unit. The excitation light source generates excitation light. The fluorescence generator is located in the optical path of the excitation light and generates fluorescence under the excitation of the excitation light, the fluorescence including a first sub-fluorescence and a second sub-fluorescence. The supplementary light source generates supplementary light. The light recovery unit is located in the optical path of the fluorescence and includes a first functional part and a second functional part. The first functional part is located in the optical path of the first sub-fluorescence and reflects the first sub-fluorescence back to the fluorescence generator. The second functional part surrounds the outer periphery of the first functional part and is located in the optical path of the second sub-fluorescence, transmitting the second sub-fluorescence. The light combining unit combines the supplementary light and the second sub-fluorescence transmitted through the light recovery unit to generate emitted light. The light combining unit includes a third functional part and a fourth functional part. The third functional part is located in the optical path of the supplementary light to cause the supplementary light to be emitted in a designated direction. The fourth functional unit surrounds the outer periphery of the third functional unit and is located in the optical path of the second sub-fluorescence, so that the second sub-fluorescence is emitted in a designated direction. The third functional unit and the first functional unit correspond to each other in the optical path.

[0006] According to a second aspect of this application, embodiments of this application also provide an optical imaging system, which includes the aforementioned light source device and light modulator. The light source device is used to generate outgoing light, and the light modulator is disposed in the optical path of the outgoing light.

[0007] This application provides a light source device and an optical imaging system. The light source device includes an excitation light source, a fluorescence generator, a supplementary light source, a light recovery unit, and a light combiner. The light combiner is used to combine the fluorescence generated by the fluorescence generator and the supplementary light generated by the supplementary light source. The light combiner may include a third functional part and a fourth functional part. The third functional part can cause the supplementary light to be emitted in a specified direction, and the fourth functional part can cause the fluorescence to be emitted in a specified direction. For example, the third functional part can transmit the supplementary light, and the fourth functional part can reflect the fluorescence. However, since the fourth functional part surrounds the outer periphery of the third functional part, when the fluorescence is incident on the fourth functional part, some of the fluorescence will also be incident on the third functional part, and the third functional part cannot reflect this part of the fluorescence, resulting in the loss of some fluorescence when the light is combined on the light combiner.

[0008] Therefore, to address the aforementioned problem of light loss during fluorescence synthesis, this application includes a light recovery element in the optical path containing the fluorescence. This light recovery element may include a first functional section and a second functional section. The first functional section is located in the optical path containing the first sub-fluorescence and is used to reflect the first sub-fluorescence to the fluorescence generator. The second functional section surrounds the first functional section and is located in the optical path containing the second sub-fluorescence, and is used to transmit the second sub-fluorescence. Here, "first sub-fluorescence" refers to the portion of fluorescence that would be incident on the third functional section without the light recovery element.

[0009] The light source device in this application incorporates a light recovery element, with its first and third functional sections corresponding in the optical path. This allows the first functional section to reflect the first sub-fluorescence incident on the third functional section. Therefore, the light recovery element can reflect a portion of the fluorescence (i.e., the first sub-fluorescence) back to the fluorescence generator, preventing it from directly participating in subsequent light combining. Instead, it is emitted again at the fluorescence generator in a near-Lambertian emission manner. This ensures that at least a portion of the first sub-fluorescence emitted again by the fluorescence generator reaches the fourth functional section of the light combining element, thereby reducing fluorescence combining loss and improving the light combining efficiency of the light source device. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of the light source device provided in the embodiments of this application.

[0012] Figure 2 yes Figure 1 A schematic diagram of a structure of an excitation light source.

[0013] Figure 3 yes Figure 1 Another schematic diagram of the structure of the excitation light source.

[0014] Figure 4 This is another structural schematic diagram of the light source device provided in the embodiments of this application.

[0015] Figure 5 This is another structural schematic diagram of the light source device provided in the embodiments of this application.

[0016] Figure 6 yes Figure 1 A schematic diagram of the structure of the supplementary light source.

[0017] Figure 7 yes Figure 1 A plan view of the first body of the Zhongguang recycling component.

[0018] Figure 8 yes Figure 1 A cross-sectional schematic diagram of the Zhongguang recycled component.

[0019] Figure 9 yes Figure 1 A schematic diagram of the structure of the second and third bodies of the optical component.

[0020] Figure 10 yes Figure 1 Another structural schematic diagram of the second and third bodies of the optical component.

[0021] Figure 11 yes Figure 1 A cross-sectional schematic diagram of the Zhonghe Optical component.

[0022] Figure 12 This is a schematic diagram of the simulation results provided in the embodiments of this application.

[0023] Figure 13 This is another structural schematic diagram of the light source device provided in the embodiments of this application.

[0024] Figure 14 This is another structural schematic diagram of the light source device provided in the embodiments of this application.

[0025] Figure 15 This is a schematic diagram of the structure of the optical imaging system provided in the embodiments of this application. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0027] This application provides a light source device 100, which is a hybrid light source formed by combining a laser light source and a fluorescent light source. The light source device 100 has the advantages of high light source brightness, simple optical path and low hardware cost, and can be widely used in projection equipment (e.g., micro projectors, short-throw projectors), laser TVs, engineering projectors and laser video walls.

[0028] Please see Figure 1 The light source device 100 in this embodiment may include an excitation light source 10, a fluorescence generator 20, a supplementary light source 30, a light recovery unit 40, and a light combining unit 50. The excitation light source 10 generates excitation light E. The fluorescence generator 20 is located in the optical path of the excitation light E and generates fluorescence F under the excitation of the excitation light E. Fluorescence F may include a first sub-fluorescence F1 and a second sub-fluorescence F2. The supplementary light source 30 generates supplementary light S.

[0029] The light recovery unit 40 is located in the optical path of the fluorescence F. The light recovery unit 40 may include a first functional part 410 and a second functional part 420. The first functional part 410 is located in the optical path of the first sub-fluorescence F1 and is used to reflect the first sub-fluorescence F1 to the fluorescence generator 20. The second functional part 420 surrounds the outer periphery of the first functional part 410 and is located in the optical path of the second sub-fluorescence F2. It is used to transmit the second sub-fluorescence F2.

[0030] The light combiner 50 combines the supplementary light S and the second sub-fluorescence F2 transmitted via the light recovery member 40 to generate the emitted light O. The light combiner 50 may include a third functional section 510 and a fourth functional section 520. The third functional section 510 is located in the optical path of the supplementary light S, causing the supplementary light S to be emitted in a designated direction M. The fourth functional section 520 surrounds the outer periphery of the third functional section 510 and is located in the optical path of the second sub-fluorescence F2, causing the second sub-fluorescence F2 to be emitted in the designated direction M. The third functional section 510 and the first functional section 410 correspond to each other in the optical path.

[0031] To address the issue of light combining loss in fluorescence F, this embodiment includes a light recovery unit 40 in the optical path of fluorescence F. This light recovery unit 40 may include a first functional section 410 and a second functional section 420. The first functional section 410 is located in the optical path of the first sub-fluorescence F1 and is used to reflect the first sub-fluorescence F1 to the fluorescence generator 20. The second functional section 420 surrounds the first functional section 410 and is located in the optical path of the second sub-fluorescence F2, and is used to transmit the second sub-fluorescence F2. Here, "first sub-fluorescence F1" refers to the portion of fluorescence that would be incident on the third functional section 510 without the light recovery unit 40.

[0032] The light source device 100 in this application is equipped with a light recovery element 40, and the first functional part 410 and the third functional part 510 of the light recovery element 40 correspond to each other in the optical path, so that the first functional part 410 can reflect the first sub-fluorescence F1 that is incident on the third functional part 510. Therefore, the light recovery element 40 in this application can reflect part of the fluorescence (that is, the first sub-fluorescence F1) back to the fluorescence generator 20, so that it will not directly participate in the subsequent light combining, but will be emitted again at the fluorescence generator 20 in a form close to Lambertian emission. This allows at least part of the first sub-fluorescence F1 emitted again by the fluorescence generator 20 to reach the fourth functional part 520 of the light combining element 50, thereby reducing the light combining loss of fluorescence F and improving the light combining efficiency of the light source device 100.

[0033] The following is a description of the various components in the light source device 100.

[0034] The excitation light source 10 is used to generate excitation light E, wherein the excitation light E can be short-wavelength visible light (e.g., blue light).

[0035] In some possible embodiments, please refer to Figure 2 The excitation light source 10 may include a first laser generator 110 and a first homogenizing device 120. The first laser generator 110 is used to generate excitation light E, which in this embodiment may be a blue laser. Specifically, the first laser generator 110 may be a single laser generator or a laser generator array composed of multiple laser generators. The first homogenizing device 120 is disposed in the optical path where the excitation light E is located, and it is used to homogenize the excitation light E to eliminate speckle in the excitation light E and improve the light source quality of the light source device 100. Specifically, the first homogenizing device 120 may be a homogenizing rod or a compound eye lens. In this embodiment, the excitation light source 10 may also include a first converging lens 130, which is disposed in the optical path where the excitation light E emitted through the first homogenizing device 120 is located, and it is used to converge the excitation light E, thereby limiting the emission area of ​​the excitation light E.

[0036] In some other possible embodiments, please refer to Figure 3 The excitation light source 10 may include a first LED light source 150 and a first lens group 160. The first LED light source 150 generates excitation light E. Specifically, the first LED light source may be a blue LED or a dark blue LED; therefore, in this embodiment, the excitation light E may be blue LED light. The first lens group 160 is disposed in the optical path of the excitation light E and is used to collect the excitation light E generated by the first LED light source 150. Specifically, the first lens group 160 may include a first sub-lens 161 and a second sub-lens 163, which are sequentially spaced along the optical path of the excitation light E to improve the collection efficiency of the excitation light E.

[0037] The fluorescence generator 20 is located in the optical path of the excitation light E. The fluorescence generator 20 is used to generate fluorescence F under the excitation of the excitation light E. The fluorescence F may include a first sub-fluorescence F1 and a second sub-fluorescence F2. Since the fluorescence F is generated under the excitation of the excitation light E, the wavelength of the fluorescence F is greater than the wavelength of the excitation light E. When the excitation light E is blue light, the fluorescence F may be green fluorescence, yellow fluorescence, etc.

[0038] In some possible embodiments, please refer to Figure 4 The fluorescence generator 20 may include a color wheel 210, and a fluorescent medium (not shown in the figure) may be disposed on the side of the color wheel 210 facing the excitation light E. The fluorescent medium generates fluorescence F under the excitation of the excitation light E. Specifically, the specific type of fluorescent medium can be determined by the researchers based on the wavelength of the fluorescence F to be excited, and this embodiment does not specifically limit it.

[0039] In some other possible embodiments, please refer to Figure 5 The fluorescence generator 20 may include a second LED light source 230. The second LED light source 230 may be a green LED, which can generate green fluorescence both on its own and under the excitation of excitation light E. Therefore, in this embodiment, the second LED light source 230, through double-sided excitation, can increase the overall brightness of the green fluorescence, thereby improving the overall combined light brightness of the light source device 100.

[0040] In this embodiment, the light source device 100 may further include a second lens group 250, which is disposed in the optical path where the fluorescence F is located, and is used to collect the fluorescence F generated by the fluorescence generator 20. Specifically, the second lens group 250 may include a third sub-lens 251 and a fourth sub-lens 253, which are sequentially spaced along the optical path where the fluorescence F is located to improve the collection efficiency of the fluorescence F.

[0041] The supplementary light source 30 is used to generate supplementary light S, which is used to enhance the overall combined brightness of the light source device 100. Please refer to [link / reference]. Figure 6 The supplementary light source 30 may include a second laser generator 320, a second homogenizing device 340, and a second converging lens 360. The second laser generator 320 generates supplementary light S. In this embodiment, the supplementary light S can be a monochromatic laser or a multi-color mixed laser, such as an RGB mixed laser. The color of the supplementary light S can be the same as or different from the color of the excitation light E; this embodiment does not impose specific limitations. Specifically, the second laser generator 320 can be a single laser generator or a laser generator array composed of multiple laser generators.

[0042] The second homogenizing device 340 is disposed in the optical path of the supplementary light S. It is used to homogenize the supplementary light S to eliminate speckle in the supplementary light S and improve the light source quality of the light source device 100. Specifically, the second homogenizing device 340 can be a homogenizing rod or a compound eye lens. In this embodiment, the second converging lens 360 is disposed in the optical path of the supplementary light S emitted through the second homogenizing device 340. It is used to converge the supplementary light S, thereby limiting the emission area of ​​the supplementary light S.

[0043] The light recovery unit 40 is located in the optical path of the fluorescence F. The light recovery unit 40 may include a first functional part 410 and a second functional part 420. The first functional part 410 is located in the optical path of the first sub-fluorescence F1 and is used to reflect the first sub-fluorescence F1 to the fluorescence generator 20. The second functional part 420 surrounds the first functional part 410 and is located in the optical path of the second sub-fluorescence F2, and is used to transmit the second sub-fluorescence F2. Therefore, in this embodiment, the light recovery unit 40 reflects a portion of the fluorescence (i.e., the first sub-fluorescence F1) back to the fluorescence generator 20, preventing it from directly participating in subsequent light combining. Instead, it is emitted again at the fluorescence generator 20 in a near-Lambertian emission form. This allows at least a portion of the first sub-fluorescence F1 emitted again by the fluorescence generator 20 to reach the fourth functional part 520 of the light combining unit 50, thereby reducing the light combining loss of the fluorescence F and improving the light combining efficiency of the light source device 100.

[0044] Please see Figure 7 and Figure 8The light-recovering component 40 may include a first body 430, a reflective layer 440, and a transmissive layer 450. The first body 430 is generally sheet-shaped (e.g., circular, square, etc.) and serves to fix and support the reflective layer 440 and the transmissive layer 450. The first body 430 may be made of a transparent material (e.g., glass) to improve light transmission efficiency. In this embodiment, the surface of the first body 430 is divided into a first region 4300 and a second region 4320 that are adjacent to each other. The first region 4300 may be located approximately at the center of the first body 430, and the second region 4320 is disposed around the outer periphery of the first region 4300. The first region 4300 is used to fix the reflective layer 440, and the second region 4320 is used to fix the transmissive layer 450. It should be noted that the names "first region" and "second region" are given for ease of description. In specific examples, there may or may not be a clear dividing line between the two structures. In this embodiment, they are different regions of the first body 430.

[0045] In this embodiment, a reflective layer 440 covers a first region 4300 to form a first functional part 410, and a transmissive layer 450 covers a second region 4320 to form a second functional part 420. Specifically, the reflective layer 440 can be attached to the first region 4300, and the shape and area of ​​the reflective layer 440 are approximately the same as those of the first region 4300 to fully cover the first region 4300. The transmissive layer 450 can be attached to the second region 4320, and the shape and area of ​​the transmissive layer 450 are approximately the same as those of the second region 4320 to fully cover the second region 4320. For example, the reflective layer 440 can be a film that reflects fluorescence F and transmits excitation light E, and the transmissive layer 450 can be a fully transparent film. The reflective layer 440 and the transmissive layer 450 can be attached to corresponding regions of the first body 430 by a coating process.

[0046] The light combiner 50 combines the supplementary light S and the second sub-fluorescence F2 transmitted via the light recovery member 40 to generate the emitted light O. The light combiner 50 may include a third functional section 510 and a fourth functional section 520. The third functional section 510 is located in the optical path of the supplementary light S, causing the supplementary light S to be emitted in a designated direction M. The fourth functional section 520 surrounds the outer periphery of the third functional section 510 and is located in the optical path of the second sub-fluorescence F2, causing the second sub-fluorescence F2 to be emitted in the designated direction M. The designated direction M refers to the direction of light combination of the supplementary light S and the second sub-fluorescence F2.

[0047] In this embodiment, the light combining member 50 may include a second body 530, a third body 540, a first coating layer 550, and a second coating layer 560. The third body 540 surrounds the outer periphery of the second body 530.

[0048] In some possible embodiments, such as Figure 9 As shown, the second body 530 and the third body 540 can be integrally formed structures, that is, the second body 530 and the third body 540 can be made of the same transparent material (e.g., glass). The names "second body" and "third body" are given for ease of description. In specific examples, there may be a clear dividing line between the two structures or there may not be a clear dividing line. In this embodiment, they are different areas of the same piece of glass.

[0049] In other possible embodiments, such as Figure 10 As shown, the third body 540 is generally sheet-shaped (e.g., circular, square, etc.) and has a clearance notch 5400. The clearance notch 5400 is generally located in the center of the third body 540. The second body 530 passes through the clearance notch 5400, so that the second body 530 is embedded in the clearance notch 5400.

[0050] In one implementation, the width of the second body 530 can be slightly larger than the width of the clearance notch 5400, meaning that an interference fit exists between the second body 530 and the clearance notch 5400, making the connection between the second body 530 and the third body 540 more robust and reliable. It should be noted that after the second body 530 passes through the clearance notch 5400, a partial gap still exists in the clearance notch 5400. Therefore, when the supplementary light S is incident on the second body 530, the supplementary light S reflected by the second body 530 can pass through the clearance notch 5400, thus preventing the supplementary light S from being blocked by the light combining member 50 when passing through it, thereby avoiding energy loss and improving the energy utilization efficiency of the supplementary light S.

[0051] As another embodiment, the light-combining member 50 may also include a fixing bracket (not shown in the figure), which is generally in the form of a block structure and is fixedly connected between the second body 530 and the third body 540 so that the plane where the second body 530 is located intersects the plane where the third body 540 is located (for example, the included angle between the two is approximately 90 degrees), thereby improving the reliability of the connection between the second body 530 and the third body 540.

[0052] In this embodiment, a first coating layer 550 covers the second body 530 to form a third functional part 510, and the first coating layer 550 is used to transmit or reflect light. A second coating layer 560 covers the third body 540 to form a fourth functional part 520. When the first coating layer 550 is used to transmit light, the second coating layer 560 is used to reflect light; when the first coating layer 550 is used to reflect light, the second coating layer 560 is used to transmit light. Please refer to [link to previous text]. Figure 11This illustrates the arrangement of the first coating layer 550 and the second coating layer 560 when the second body 530 and the third body 540 are integrally formed. The first coating layer 550 can be attached to the second body 530, and its shape and area are approximately the same as those of the second body 530 to fully cover the second body 530. The second coating layer 560 can be attached to the third body 540, and its shape and area are approximately the same as those of the third body 540 to fully cover the third body 540.

[0053] Specifically, in Figure 4 In the illustrated embodiment, the first coating layer 550 can be a transmissive film, and the second coating layer 560 can be a reflective film, so that the third functional unit 510 can transmit supplementary light S, and the fourth functional unit 520 can reflect the second sub-fluorescence F2. Figure 5 In the embodiment shown, the first coating layer 550 can be a reflective film, and the second coating layer 560 can be a transmissive film, so that the third functional part 510 can reflect supplementary light S, and the fourth functional part 520 can transmit the second sub-fluorescence F2.

[0054] In this embodiment, the projected area of ​​the third functional unit 510 in the incident direction of the supplementary light S is greater than or equal to the light-emitting surface area of ​​the supplementary light S. Therefore, when the supplementary light S is incident on the light combining member 50, the optical path of the supplementary light S can fully fall into the area where the third functional unit 510 is located, so that the supplementary light S can be fully transmitted or reflected by the third functional unit 510. Therefore, when the supplementary light source 30 is determined, the position and area of ​​the third functional unit 510 are also determined.

[0055] In this embodiment, the area S1 of the first functional unit 410 and the projected area S2 of the third functional unit 510 on the incident direction N of the second sub-fluorescence F2 satisfy a specified first relationship. The first relationship can be derived by the researchers based on the specific optical path structure of the light source device 100, so that the first functional unit 410 can fully reflect the first sub-fluorescence F1 incident on the third functional unit 510, thereby improving the recovery efficiency of the first sub-fluorescence F1.

[0056] In some possible embodiments, such as Figure 5 As shown, Figure 5The fluorescence F is generated by the excitation of the second LED light source 230, and therefore, the fluorescence F is emitted in approximately parallel light. In this case, the magnitudes of S1 and S2 are approximately the same. Furthermore, through extensive simulation experiments, the researchers found that when the ratio between S1 and S2 meets a specified ratio range, the fluorescence energy after light combining at the light combining element 50 is greater than the fluorescence energy without the light recovery element 40. Specifically, the first relationship satisfied by S1 and S2 is as follows:

[0057] S2*0.56≤S1≤S2*1.44.

[0058] In some possible embodiments, the region where the first functional unit 410 is located is defined by a first line segment and at least one first line, and the region where the third functional unit 510 is located is defined by a second line segment and at least one second line. The length L1 of the first line segment and the length L2 of the projection line of the second line segment onto the incident direction N of the second sub-fluorescence F2 satisfy a specified second relationship, which is as follows:

[0059] L2*0.75≤L1≤L2*1.2.

[0060] For example, the first functional unit 410 and the third functional unit 510 can be generally rectangular regions. The first line segment can be a side of the rectangle corresponding to the first functional unit 410, and the second line segment can be a side of the rectangle corresponding to the third functional unit 510. The first line segment and the second line segment correspond to each other in the optical path. In other possible examples, the first functional unit 410 and the third functional unit 510 can be generally other polygonal regions (e.g., pentagons, hexagons, etc.) or irregularly shaped regions (e.g., semicircles). In other possible examples, the first functional unit 410 and the third functional unit 510 can also be generally circular regions. In this case, the geometric parameters of the first functional unit 410 and the third functional unit 510 only satisfy the first relation and not the second relation.

[0061] Please see Figure 12 The figure shows the simulation results provided in this application. The horizontal axis represents the Lambertian reflectance of the fluorescence generator 20, and the vertical axis represents the change in fluorescence energy after light combining at the light combining element 50. Different curves characterize the fluorescence energy change trend under different lengths of the first line segment; the dashed line represents the fluorescence energy change trend without the light recovery element 40. X0 is the length of the first line segment under ideal conditions; that is, when the length of the first line segment is X0, the light emitted from the first line segment will completely coincide with the second line segment located in the third functional unit 510. Ideally, when the fluorescence F is emitted approximately in parallel light, L1 = L2 = X0.

[0062] from Figure 12It is not difficult to observe that when the length L1 of the first line segment is slightly less than or slightly greater than L2, and the Lambertian reflectance is greater than a certain value (e.g., 70%), the fluorescence energy after light combining at the light combining element 50 is greater than the fluorescence energy when the light recovery element 40 is not provided. Therefore, when researchers determine the geometric parameters of the first functional unit 410 based on the geometric parameters (e.g., area, side length) of the third functional unit 510, there can be a certain degree of error, allowing researchers greater flexibility in designing the first functional unit 410.

[0063] In some possible embodiments, when L1 and L2 strictly satisfy L1 = L2, the fluorescence energy reflected by the first functional unit 410 will be greater than the fluorescence energy lost at the third functional unit 510. This is because the first functional unit 410 not only reflects the fluorescence at the angle corresponding to the loss in the area where the third functional unit 510 is located, but also reflects some fluorescence at a larger emission angle, so that some of the fluorescence that would originally be transmitted to the fourth functional unit 520 will also be reflected by the first functional unit 410.

[0064] Therefore, when the R&D personnel actually design the length L1 of the first line segment, the length L1 can be designed to be slightly smaller than L2. For example, L1 can be approximately equal to 0.78*L2, which can reduce additional fluorescence luminescence loss and improve the fluorescence recovery efficiency of the light recovery component 40.

[0065] In some other possible embodiments, the third functional unit 510 and the first functional unit 410 may be substantially conjugate, that is, the third functional unit 510 and the first functional unit 410 are matched according to a certain rule. Specifically, the third functional unit 510 and the first functional unit 410 may be optically conjugate. In this embodiment, "optical conjugate" means that the third functional unit 510 and the first functional unit 410 form an image of each other with respect to the optical device between them. It should be noted that the above-mentioned conjugate relationship between the third functional unit 510 and the first functional unit 410 should be understood as follows: the third functional unit 510 and the first functional unit 410 are not required to be strictly conjugate. The third functional unit 510 and the first functional unit 410 have a certain range of deviation on the basis of conjugation, and the above deviation also falls within the scope of the existence of a conjugate relationship referred to in this case.

[0066] In this embodiment, the light source device 100 may further include a relay module 60, which is disposed between the light recovery element 40 and the light combining element 50, and is used to converge the second sub-fluorescence F2 between the light recovery element 40 and the light combining element 50. Please refer to [link to relevant documentation]. Figure 4 , Figure 4The fluorescence F in the light source is generated by the excitation of the color wheel 210, therefore, the second sub-fluorescence F2 diffuses at a certain angle. In this case, the light source device 100 can improve the collection efficiency of the second sub-fluorescence F2 by setting the relay module 60 to focus the light.

[0067] The relay module 60 may include a first lens 600 and a second lens 610, which are sequentially located between the light recovery unit 40 and the light combining unit 50 to further improve the collection efficiency of the second sub-fluorescence F2. Specifically, the first lens 600 and the second lens 610 may be a single lens or a lens group formed by multiple lenses. This embodiment does not specifically limit the number and specific implementation of the first lens 600 and the second lens 610. By setting the first lens 600 and the second lens 610, this embodiment makes the third functional unit 510 and the first functional unit 410 approximately optically conjugate.

[0068] Specifically, the equivalent focal length of the first lens 600 is a first focal length f1, and the equivalent focal length of the second lens 610 is a second focal length f2. The first relationship satisfied by S1 and S2 is as follows:

[0069]

[0070] In some possible embodiments, the region containing the first functional unit 410 is defined by a first line segment and at least one first line, and the region containing the second functional unit 420 is defined by a second line segment and at least one second line. The length L1 of the first line segment and the length L2 of the projection line of the second line segment in the incident direction of the second sub-fluorescence F2 satisfy a specified second relationship, which is as follows:

[0071]

[0072] For example, the first functional unit 410 and the third functional unit 510 can be generally rectangular regions. The first line segment can be a side of the rectangle corresponding to the first functional unit 410, and the second line segment can be a side of the rectangle corresponding to the third functional unit 510. The first line segment and the second line segment correspond to each other in the optical path. In other possible examples, the first functional unit 410 and the third functional unit 510 can be generally other polygonal regions (e.g., pentagons, hexagons, etc.) or irregularly shaped regions (e.g., semicircles). In other possible examples, the first functional unit 410 and the third functional unit 510 can also be generally circular regions. In this case, the geometric parameters of the first functional unit 410 and the third functional unit 510 only satisfy the first relation and not the second relation.

[0073] In this embodiment, due to the presence of the first lens 600 and the second lens 610, the geometric parameters corresponding to the first functional unit 410 and the third functional unit 510 satisfy an optical conjugate relationship. That is, when the light rays emitted from the first line segment completely coincide with the second line segment located in the third functional unit 510, L1 and L2 satisfy the following formula:

[0074]

[0075] In some possible embodiments, L1 and L2 strictly satisfy... In this case, the fluorescence energy reflected by the first functional unit 410 will be greater than the fluorescence energy lost at the third functional unit 510. This is because the first functional unit 410 not only reflects the fluorescence at the angle corresponding to the area lost by the third functional unit 510, but also reflects some fluorescence at a larger emission angle, so that some of the fluorescence that would have been transmitted to the fourth functional unit 520 will also be reflected by the first functional unit 410.

[0076] Therefore, when R&D personnel actually design the length L1 of the first line segment, they can design this length L1 to be slightly smaller than... For example, L1 can be approximately equal to This can reduce additional fluorescence luminescence loss and improve the fluorescence recovery efficiency of the light recovery component 40.

[0077] In some possible embodiments, the first lens 600 and the second lens 610 can be coaxially arranged, and the third functional unit 510 can be located at the center of the optical axis of the second lens 610, coaxially with the light spot of the fluorescence F. Specifically, the relay module 60 may further include a first homogenizing mirror 620, which is located between the first lens 600 and the second lens 610 and is used to homogenize the second sub-fluorescence F2 between the first lens 600 and the second lens 610. Specifically, the first homogenizing mirror 620 can be a homogenizing rod or a compound eye lens.

[0078] In some other possible embodiments, please refer to Figure 13 The first lens 600 and the second lens 610 can be arranged off-axis. The relay module 60 may also include a second homogenizing mirror 640 and a first reflecting mirror 650. The first reflecting mirror 650 and the second homogenizing mirror 640 are sequentially located between the first lens 600 and the second lens 610. The first reflecting mirror 650 is used to reflect the second sub-fluorescence F2 emitted through the first lens 600 to the second homogenizing mirror 640. The second homogenizing mirror 640 is used to homogenize the second sub-fluorescence F2 and direct it to the second lens 610. Specifically, the second homogenizing mirror 640 can be a homogenizing rod or a compound eye lens.

[0079] In this embodiment, the second homogenizing mirror 640 and the first reflecting mirror 650 are respectively disposed on opposite sides of the color wheel 210. The color wheel 210 can also be used to transmit the second sub-fluorescence F2 between the second homogenizing mirror 640 and the first reflecting mirror 650. The color wheel 210 may include a first functional region (not shown in the figure) and a second functional region (not shown in the figure). The first functional region is disposed in the optical path where the excitation light E is located, and it is used to generate and reflect fluorescence F under the excitation of the excitation light. The second functional region is disposed between the second homogenizing mirror 640 and the first reflecting mirror 650, and it is used to transmit the second sub-fluorescence F2. This embodiment, by folding the optical path to a certain extent, makes the overall structure of the light source device 100 more compact, which is beneficial for miniaturizing the device equipped with the light source device 100.

[0080] In some possible embodiments, the relay module 60 may include a third lens 670, and the light source device 100 may also include a compound eye lens 690. Please refer again. Figure 5 A third lens 670 is disposed between the light-recovering element 40 and the light-combining element 50 to converge the second sub-fluorescence F2 between the two elements, thereby limiting the light angle of the second sub-fluorescence F2. A compound eye lens 690 is disposed in the optical path of the outgoing light O to homogenize the outgoing light O generated after being combined by the light-combining element 50, thereby improving the uniformity of the outgoing light O. Because this embodiment reduces the light angle of the second sub-fluorescence F2 by the third lens 670, the light angle of the second sub-fluorescence F2 can meet the angle requirements of the incident light by the compound eye lens 690, allowing the compound eye lens 690 to fully homogenize the second sub-fluorescence F2 in the outgoing light O.

[0081] The light source device 100 may further include a color filter 70, which is located in the optical path containing the excitation light E and the second sub-fluorescence F2. The color filter 70 is used to direct the excitation light E toward the fluorescence generator 20 and the second sub-fluorescence F2 toward the light combining element 50. A light recovery element 40 is disposed on the side of the color filter 70 facing the fluorescence generator 20. Therefore, in this embodiment, by placing the light recovery element 40 closer to the fluorescence generator 20, the light recovery element 40 can fully reflect the first sub-fluorescence F1, improving the efficiency of fluorescence recovery. In some other possible embodiments, the light recovery element 40 is also disposed on the side of the color filter 70 away from the fluorescence generator 20; this embodiment does not specifically limit this.

[0082] Please refer to it again. Figure 4The color filter 70 may include a first dichroic color filter 700, which reflects the excitation light E to the color wheel 210 and transmits the second sub-fluorescence F2 to the light combiner 50. In this embodiment, the excitation light E may include a first sub-excitation light E1 (not shown) and a second sub-excitation light E2. The color wheel 210 is used to generate fluorescence F under the excitation of the first sub-excitation light E1, and the second sub-excitation light E2 is emitted to the light combiner 50 after passing through the color wheel 210. Specifically, the surface of the first dichroic color filter 700 may be coated with a film that reflects blue laser light and transmits fluorescence.

[0083] In this embodiment, when the excitation light E is incident on the color wheel 210, a portion of the excitation light E (i.e., the first sub-excitation light E1) is converted into fluorescence F under the excitation of the color wheel 210, and another portion of the excitation light E (i.e., the second sub-excitation light E2) is transmitted through the color wheel 210 and emitted to the light combining member 50. Therefore, the excitation light E in this embodiment can not only be used to excite fluorescence F, but also participate in subsequent light combining, which improves the utilization efficiency of the excitation light E and thus enhances the overall brightness of the light source device 100.

[0084] Specifically, the light source device 100 may further include a plurality of excitation light reflectors, which are sequentially arranged in the optical path of the second sub-excitation light E2 transmitted through the color wheel 210. These reflectors reflect the second sub-excitation light E2 transmitted through the color wheel 210 to the first dichroic color filter 700, which in turn reflects the second sub-excitation light E2 to the light combining member 50. In some possible embodiments, the plurality of excitation light reflectors may include a second reflector 711, a third reflector 713, and a fourth reflector 715. The second sub-excitation light E2 transmitted through the color wheel 210 is reflected by these reflectors and then incident on the first dichroic color filter 700. The third reflector 713 and the fourth reflector 715 are arranged on opposite sides of the color wheel 210, which makes the reflected optical path of the second sub-excitation light E2 more compact, facilitating the miniaturization of the device equipped with the light source device 100.

[0085] It is not difficult to understand here that, due to Figure 4 The illustrated embodiment uses a laser as the excitation light E. Therefore, based on the good collimation of the laser, the second sub-excitation light E2 does not suffer significant energy loss after multiple reflections, thus ensuring the utilization efficiency of the second sub-excitation light E2. Furthermore, in Figure 4In the embodiment shown, the light source device 100 may further include a first focusing lens 717 and a second focusing lens 719. The first focusing lens 717 is disposed between the color wheel 210 and the second reflecting mirror 711, and the second focusing lens 719 is disposed between the second reflecting mirror 711 and the third reflecting mirror 713. They are respectively used to converge the second sub-excitation light E2 and reduce the energy loss of the second sub-excitation light E2 during the reflection process.

[0086] Please refer to it again. Figure 5 The color filter 70 may include a second dichroic color filter 720, which is used to reflect the excitation light E to the second LED light source 230 and transmit the second sub-fluorescence F2 to the light combiner 50.

[0087] In some possible embodiments, the light source device 100 may further include a third LED light source 810 and a third lens group 830. The third LED light source 810 is used to generate a first designated light D1, the wavelength of which is less than the wavelength of the fluorescence F. For example, the first designated light D1 may be blue light, and the third LED light source 810 may be a blue LED. The third lens group 830 is disposed in the optical path of the first designated light D1 and is used to collect the first designated light D1 generated by the third LED light source 810. Specifically, the third lens group 830 may include a fifth sub-lens 831 and a sixth sub-lens 833, which are sequentially spaced along the optical path of the first designated light D1 to improve the collection efficiency of the first designated light D1.

[0088] The second dichroic filter 720 is also used to reflect the first designated light D1 to the light combining member 50, so that the first designated light D1 participates in the light combining. Therefore, the light source device 100 in this embodiment can further improve the overall brightness of the light source device 100 by setting the third LED light source 810.

[0089] In some possible embodiments, the light source device 100 may further include a fourth LED light source 850 and a fourth lens group 870. The fourth LED light source 850 is used to generate a second specified light D2, the wavelength of which is greater than the wavelength of the fluorescence F. For example, the second specified light D2 may be red light, and the fourth LED light source 850 may be a red LED. The fourth lens group 870 is disposed in the optical path of the second specified light D2 and is used to collect the second specified light D2 generated by the fourth LED light source 850. Specifically, the fourth lens group 870 may include a seventh sub-lens 871 and an eighth sub-lens 873, which are sequentially spaced along the optical path of the second specified light D2 to improve the collection efficiency of the second specified light D2.

[0090] The light combining element 50 is also used to reflect the second designated light D2. Therefore, the light source device 100 in this embodiment can further improve the overall brightness of the light source device 100 by providing the third LED light source 810. Therefore, Figure 5 In the embodiment shown, the second LED light source 230, the third LED light source 810 and the fourth LED light source 850 can provide three-color LED light respectively. With the supplementary light source 30 providing RGB mixed laser, the three-color laser and the three-color LED light are combined, ensuring the application scenarios of the light source device 100.

[0091] Please refer to it again. Figure 13 The color filter 70 may include a third dichroic color filter 730. The third dichroic color filter 720 is used to transmit the excitation light E to the color wheel 210 and reflect the second sub-fluorescence F2 to the light combiner 50. In this embodiment, the excitation light E may include a first sub-excitation light E1 (not shown) and a second sub-excitation light E2. The color wheel 210 is used to generate fluorescence F under the excitation of the first sub-excitation light E1, and the second sub-excitation light E2 is emitted to the light combiner 50 after passing through the color wheel 210. Specifically, the surface of the third dichroic color filter 730 may be coated with a film layer that reflects blue laser light and fluorescence.

[0092] In this embodiment, when the excitation light E is incident on the color wheel 210, a portion of the excitation light E (i.e., the first sub-excitation light E1) is converted into fluorescence F under the excitation of the color wheel 210, while another portion of the excitation light E (i.e., the second sub-excitation light E2) is reflected by the color wheel 210 and emitted to the light combining member 50. Therefore, the excitation light E in this embodiment can not only be used to excite fluorescence F, but also participate in subsequent light combining, improving the utilization efficiency of the excitation light E and thus enhancing the overall brightness of the light source device 100. Specifically, the excitation light E can be incident on the color wheel 210 at a certain angle (e.g., the angle is greater than 45 degrees and less than 90 degrees), so that the second sub-excitation light E2 can be reflected by the color wheel 210 at a certain angle to avoid the optical path of the excitation light E and the optical path of the second sub-excitation light E2 coinciding, so that the second sub-excitation light E2 can be successfully emitted to the light combining member 50.

[0093] Specifically, the light source device 100 may further include a fifth reflector 712, which is disposed on the side of the third dichroic color filter 730 opposite to the color wheel 210. The fifth reflector 712 is used to reflect the second sub-excitation light E2 transmitted through the third dichroic color filter 730 back to the third dichroic color filter 720. The third dichroic color filter 720 is also used to transmit the second sub-excitation light E2 reflected by the fifth reflector 712 to the light combining member 50. In this embodiment, by setting the fifth reflector 712, the second sub-excitation light E2 can be smoothly emitted to the light combining member 50, ensuring that the second sub-excitation light E2 can participate in subsequent light combining.

[0094] Please see Figure 14 The color filter 70 may include a fourth dihedral color filter 740, which is a regional dihedral color filter. The fourth dihedral color filter 740 includes a transmission functional section 741 and a reflection functional section 743. The transmission functional section 741 transmits excitation light E to the color wheel 210. The reflection functional section 743 surrounds the outer periphery of the transmission functional section 741 and reflects the second sub-fluorescence F2 to the light combining member 50. In this embodiment, the excitation light E may include a first sub-excitation light E1 (not shown) and a second sub-excitation light E2. The color wheel 210 generates fluorescence F under the excitation of the first sub-excitation light E1, and the second sub-excitation light E2 is emitted to the light combining member 50 after passing through the color wheel 210. Specifically, the transmission functional section 741 of the fourth dihedral color filter 740 may be coated with a film that transmits blue laser light and reflects fluorescence, and the reflection functional section 743 may be coated with a film that reflects both blue laser light and fluorescence.

[0095] In this embodiment, when the excitation light E is incident on the color wheel 210, a portion of the excitation light E (i.e., the first sub-excitation light E1) is converted into fluorescence F under the excitation of the color wheel 210, and another portion of the excitation light E (i.e., the second sub-excitation light E2) is reflected by the color wheel 210 and emitted to the light combining member 50. Therefore, the excitation light E in this embodiment can not only be used to excite fluorescence F, but also participate in subsequent light combining, improving the utilization efficiency of the excitation light E, thereby improving the overall brightness of the light source device 100. Specifically, when the second sub-excitation light E2 is reflected by the color wheel 210, the color wheel 210 is also used to scatter the second sub-excitation light E2 at a large angle, so that the second sub-excitation light E2 can be incident on the area where the reflection function part 743 of the fourth dichroic color filter 740 is located, and the second sub-excitation light E2 is emitted to the light combining member 50 through the reflection function part 743. Therefore, this embodiment and Figure 13 Compared to the embodiment shown, one less reflector can be installed (i.e., Figure 13 The fifth reflector 712 in the light source device 100 is used to save on hardware costs.

[0096] This application also provides an optical imaging system 900, which includes the aforementioned light source device 100. This system can be widely used in projection devices (e.g., micro projectors, short-throw projectors), laser TVs, engineering projectors, and laser video walls. Please refer to... Figure 15 The optical imaging system 900 may include a light source device 100, a lens module 910, a prism module 920, and a light modulator 930.

[0097] The light source device 100 is used to generate emitted light O. The specific structure of the light source device 100 can be found in the description in the above embodiments. The lens module 910 is disposed in the optical path of the emitted light O, serving to converge the emitted light O. Specifically, the lens module 910 may include a single lens or a lens group composed of multiple lenses.

[0098] A prism module 920 is disposed between the lens module 910 and the light modulator 930. It is used to reflect the outgoing light O and focus it onto the light modulator 930. The light modulator 930 is used to modulate the light to form a beam carrying image information. The prism module 920 is also used to transmit the beam carrying image information through a projection area, such as a wall or projection screen.

[0099] Specifically, the optical modulator 930 can be a digital micromirror device (DMD). The DMD is composed of an array of digital micromirrors, with each digital micromirror constituting a modulation unit. Each modulation unit is used to modulate the image corresponding to one pixel. Each digital micromirror flips under the drive signal generated by the controller. The number of flips of each digital micromirror is determined by the drive signal. The flipped digital micromirrors modulate the light reflected from the prism module 920 and form light carrying image information.

[0100] This embodiment provides a light source device 100 and an optical imaging system 900 equipped with the light source device 100. The light source device 100 may include an excitation light source 10, a fluorescence generator 20, a supplementary light source 30, a light recovery unit 40, and a light combining unit 50. The excitation light source 10 generates excitation light E. The fluorescence generator 20 is located in the optical path of the excitation light E and generates fluorescence F under the excitation of the excitation light E. Fluorescence F may include a first sub-fluorescence F1 and a second sub-fluorescence F2. The supplementary light source 30 generates supplementary light S.

[0101] The light recovery unit 40 is located in the optical path of the fluorescence F. The light recovery unit 40 may include a first functional part 410 and a second functional part 420. The first functional part 410 is located in the optical path of the first sub-fluorescence F1 and is used to reflect the first sub-fluorescence F1 to the fluorescence generator 20. The second functional part 420 surrounds the outer periphery of the first functional part 410 and is located in the optical path of the second sub-fluorescence F2. It is used to transmit the second sub-fluorescence F2.

[0102] The light combining member 50 combines the supplementary light S and the second sub-fluorescence F2 transmitted via the light recovery member 40 to generate the emitted light O. The light combining member 50 may include a third functional section 510 and a fourth functional section 520. The third functional section 510 is located in the optical path of the supplementary light S, causing the supplementary light S to be emitted in a designated direction M. The fourth functional section 520 surrounds the outer periphery of the third functional section 510 and is located in the optical path of the second sub-fluorescence F2, causing the second sub-fluorescence F2 to be emitted in the designated direction M. The area S1 of the first functional section 410 and the projected area S2 of the third functional section 510 in the incident direction N of the second sub-fluorescence F2 satisfy a designated first relationship.

[0103] To address the issue of light combining loss in fluorescence F, this embodiment includes a light recovery unit 40 in the optical path of fluorescence F. This light recovery unit 40 may include a first functional section 410 and a second functional section 420. The first functional section 410 is located in the optical path of the first sub-fluorescence F1 and is used to reflect the first sub-fluorescence F1 to the fluorescence generator 20. The second functional section 420 surrounds the first functional section 410 and is located in the optical path of the second sub-fluorescence F2, and is used to transmit the second sub-fluorescence F2. Here, "first sub-fluorescence F1" refers to the portion of fluorescence that would be incident on the third functional section 510 without the light recovery unit 40.

[0104] The light source device 100 in this application is equipped with a light recovery element 40, and the first functional part 410 and the third functional part 510 of the light recovery element 40 correspond to each other in the optical path, so that the first functional part 410 can reflect the first sub-fluorescence F1 that is incident on the third functional part 510. Therefore, the light recovery element 40 in this application can reflect part of the fluorescence (that is, the first sub-fluorescence F1) back to the fluorescence generator 20, so that it will not directly participate in the subsequent light combining, but will be emitted again at the fluorescence generator 20 in a form close to Lambertian emission. This allows at least part of the first sub-fluorescence F1 emitted again by the fluorescence generator 20 to reach the fourth functional part 520 of the light combining element 50, thereby reducing the light combining loss of fluorescence F and improving the light combining efficiency of the light source device 100.

[0105] In this application specification, certain terms are used to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. The specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "including but not limited to"; "generally" means that those skilled in the art can solve the technical problem within a certain margin of error and basically achieve the technical effect.

[0106] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "inside", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the purpose of simplifying the description of this application and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0107] In this application, unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or merely surface contact. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0108] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0109] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A light source device, characterized in that, include: Excitation light source, used to generate excitation light; A fluorescence generator is located in the optical path of the excitation light; The fluorescence generator is used to generate fluorescence under the excitation of the excitation light, and the fluorescence includes a first sub-fluorescence and a second sub-fluorescence. Supplemental light source, used to generate supplemental light; A light recovery element is located on the optical path where the fluorescence is located; the light recovery element includes a first functional part and a second functional part, the first functional part is located on the optical path where the first sub-fluorescence is located, and is used to reflect the first sub-fluorescence to the fluorescence generator; the second functional part surrounds the outer periphery of the first functional part and is located on the optical path where the second sub-fluorescence is located, and is used to transmit the second sub-fluorescence. as well as A light combiner is used to combine the supplementary light and the second sub-fluorescence transmitted through the light recovery element to generate emitted light; the light combiner includes a third functional part and a fourth functional part, the third functional part being located in the optical path of the supplementary light to cause the supplementary light to be emitted in a specified direction; the fourth functional part is surrounding the outer periphery of the third functional part and located in the optical path of the second sub-fluorescence to cause the second sub-fluorescence to be emitted in the specified direction; the third functional part and the first functional part correspond to each other in the optical path.

2. The light source device according to claim 1, characterized in that, The area S1 of the first functional part and the projected area S2 of the third functional part in the incident direction of the second sub-fluorescence satisfy a specified first relationship, which is as follows: S2*0.56≤S1≤S2*1.

44.

3. The light source device according to claim 2, characterized in that, The region containing the first functional unit is defined by a first line segment and at least one first line, and the region containing the third functional unit is defined by a second line segment and at least one second line; the length L1 of the first line segment and the length L2 of the projection line of the second line segment in the incident direction of the second sub-fluorescence satisfy a specified second relationship, which is as follows: L2*0.75≤L1≤L2*1.

2.

4. The light source device according to claim 1, characterized in that, The third functional part and the first functional part are conjugate.

5. The light source device according to claim 4, characterized in that, The light source device further includes a relay module, which is disposed between the light recovery element and the light combining element, and is used to gather the second sub-fluorescence between the light recovery element and the light combining element.

6. The light source device according to claim 5, characterized in that, The relay module includes a first lens and a second lens, which are sequentially located between the light recovery unit and the light combining unit; the equivalent focal length of the first lens is a first focal length f1, and the equivalent focal length of the second lens is a second focal length f2; the area S1 of the first functional part and the projected area S2 of the third functional part in the incident direction of the second sub-fluorescence satisfy a specified first relationship, which is shown below:

7. The light source device according to claim 6, characterized in that, The region containing the first functional unit is defined by a first line segment and at least one first line, and the region containing the third functional unit is defined by a second line segment and at least one second line; the length L1 of the first line segment and the length L2 of the projection line of the second line segment in the incident direction of the second sub-fluorescence satisfy a specified second relationship, which is as follows:

8. The light source device according to claim 6, characterized in that, The first lens and the second lens are coaxially arranged; the relay module further includes a first homogenizing mirror, which is located between the first lens and the second lens; or The first lens and the second lens are arranged off-axis; the relay module further includes a second homogenizing mirror and a first reflecting mirror, the first reflecting mirror and the second homogenizing mirror being located between the first lens and the second lens in sequence; the first reflecting mirror is used to reflect the second sub-fluorescence emitted through the first lens to the second homogenizing mirror.

9. The light source device according to claim 1, characterized in that, The light recovery component includes a first body, a reflective layer, and a transmissive layer. The surface of the first body is divided into a first region and a second region that are adjacent to each other. The reflective layer covers the first region to form the first functional part; the transmissive layer covers the second region to form the second functional part.

10. The light source device according to claim 1, characterized in that, The light-combining component includes a second body, a third body, a first coating layer, and a second coating layer, wherein the third body surrounds the outer periphery of the second body; The first coating layer covers the second body to form the third functional part, and the first coating layer is used to transmit or reflect light; The second coating layer covers the third body to form the fourth functional part. When the first coating layer is used to transmit light, the second coating layer is used to reflect light; when the first coating layer is used to reflect light, the second coating layer is used to transmit light.

11. The light source device according to claim 1, characterized in that, The projected area of ​​the third functional unit in the incident direction of the supplementary light is greater than or equal to the light-emitting surface area of ​​the supplementary light.

12. The light source device according to claim 1, characterized in that, The light source device further includes a color filter located in the optical path where the excitation light and the second sub-fluorescence are located; used to cause the excitation light to be emitted toward the fluorescence generator and the second sub-fluorescence to be emitted toward the light combining element. The light recovery element is disposed on the side of the color filter facing the fluorescence generator.

13. The light source device according to claim 12, characterized in that, The excitation light source includes a first LED light source, and the fluorescence generator includes a second LED light source; The color filter is used to reflect the excitation light to the second LED light source and transmit the second sub-fluorescence to the light combining element.

14. The light source device according to claim 13, characterized in that, The light source device further includes a third LED light source, which is used to generate a first specified light, the wavelength of which is less than the wavelength of the fluorescence; The color filter is also used to reflect the first designated light to the light combining element.

15. The light source device according to claim 13, characterized in that, The light source device further includes a fourth LED light source, which is used to generate a second specified light, the wavelength of which is greater than the wavelength of the fluorescence; The light-combining element is also used to reflect the second designated light.

16. An optical imaging system, characterized in that, include: The light source device according to any one of claims 1 to 15, wherein the light source device is used to generate emitted light; as well as An optical modulator is disposed in the optical path of the emitted light.

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