Light source device and optical imaging system

Abstract

The invention discloses a light source device and an optical imaging system. The exciting light source is used for generating exciting light. And the fluorescence generator is used for generating fluorescence under the excitation of the exciting light. The supplementary light source is used for generating supplementary light. The first functional part of the light recovery part is used for reflecting the first sub-fluorescence to the fluorescence generator, and the second functional part of the light recovery part is used for transmitting the second sub-fluorescence. And the light combining part is used for combining the supplementary light and the second sub-fluorescence transmitted by the light recovery part to generate emergent light. The third function part of the light combining part is used for emitting the supplementary light in the specified direction, and the light combining part is used for emitting the second sub-fluorescence in the specified direction. Due to the fact that the third function part corresponds to the first function part on the light path, the light recovery part can reflect the first sub-fluorescence back to the fluorescence generator, the first sub-fluorescence does not directly participate in follow-up light combination, the first sub-fluorescence is emitted again in the mode close to Lambert light emission at the fluorescence generator, the light combination loss of fluorescence is reduced, and the light combination efficiency is improved.

Description

Technical Field

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

[0002] At present, the main light source used in projection equipment is RGB laser light source, which has the advantages of high brightness, wide color gamut, good monochromaticity, etc. However, for projection equipment using small F-number lenses, RGB light source laser cannot provide obvious brightness gain.

[0003] In order to solve the above problems, researchers have proposed a hybrid light source of laser plus fluorescence (e.g., LED), so that the laser light source can improve the light source brightness of the projection device after adding the fluorescent light source. However, when the laser light source and the fluorescent light source are combined by a light combining component (e.g., a light combining mirror) to expand the light, the fluorescent light source will have a certain light combining loss, which reduces the light combining efficiency of the projection device. Summary of the invention

[0004] Embodiments of the present application provide a light source device and an optical imaging system.

[0005] According to the first aspect of the present application, an embodiment of the present application provides a light source device, which includes an excitation light source, a fluorescence generator, a supplementary light source, a light recycling component and a light combining component. Among them, the excitation light source is used to generate excitation light. The fluorescence generator is located on the optical path where the excitation light is located, and 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. The supplementary light source is used to generate supplementary light. The light recycling component is located on the optical path where the fluorescence is located, and the light recycling component includes a first functional part and a second functional part, wherein 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 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. The light combining component is used to combine the supplementary light and the second sub-fluorescence transmitted through the light recycling component to generate an output light. The light combining component includes a third functional part and a fourth functional part, wherein the third functional part is located on the optical path where the supplementary light is located, so that the supplementary light is emitted in a specified direction. The fourth functional part surrounds the outer periphery of the third functional part and is located on the optical path where the second sub-fluorescence is located, so that the second sub-fluorescence is emitted toward a specified direction. The third functional part corresponds to the first functional part on the optical path.

[0006] According to the second aspect of the present application, an embodiment of the present application further provides an optical imaging system, which includes the above-mentioned light source device and a light modulator, wherein the light source device is used to generate outgoing light, and the light modulator is arranged on the light path where the outgoing light is located.

[0007] The present application provides a light source device and an optical imaging system, wherein the light source device includes an excitation light source, a fluorescence generator, a supplementary light source, a light recycling component, and a light combining component. The light combining component is used to combine the fluorescence generated by the fluorescence generator and the supplementary light generated by the supplementary light source, wherein the light combining component may include a third functional part and a fourth functional part, wherein the third functional part may cause the supplementary light to be emitted in a specified direction, and the fourth functional part may cause the fluorescence to be emitted in a specified direction. Exemplarily, the third functional part may transmit the supplementary light, and the fourth functional part may reflect the fluorescence. However, since the fourth functional part surrounds the periphery of the third functional part, when the fluorescence is incident on the fourth functional part, part of the fluorescence will be incident on the third functional part, and the third functional part cannot reflect the part of the fluorescence, causing part of the fluorescence to be lost when it is combined on the light combining component.

[0008] Therefore, in order to solve the problem of light combination loss caused by the above-mentioned fluorescence, the present application sets a light recovery component on the optical path where the fluorescence is located. The light recovery component may include 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 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. Among them, "first sub-fluorescence" refers to the part of fluorescence that will be incident on the third functional part when the light recovery component is not set.

[0009] The light source device in the present application is provided with a light recycling component, and the first functional part and the third functional part of the light recycling component correspond to each other in the optical path, so that the first functional part can reflect the first sub-fluorescence that will be incident on the third functional part. Therefore, the light recycling component in the present application can reflect part of the fluorescence (that is, the first sub-fluorescence) back to the fluorescence generator, so that it will not directly participate in the subsequent light combination, but will be emitted again at the fluorescence generator in a form close to Lambertian luminescence, so that at least part of the first sub-fluorescence emitted again by the fluorescence generator can reach the fourth functional part of the light combination component, thereby reducing the light combination loss of the fluorescence and improving the light combination efficiency of the light source device. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0011] Figure 1 It is a schematic diagram of the structure of the light source device provided in an embodiment of the present application.

[0012] Figure 2 yes Figure 1 A structural schematic diagram of the excitation light source.

[0013] Figure 3 yes Figure 1 Schematic diagram of another structure of the excitation light source.

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

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

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

[0017] Figure 7 yes Figure 1 A schematic plan view of the first body of the light recycling element.

[0018] Figure 8 yes Figure 1 Schematic cross-section of the light recovery component.

[0019] Fig. 9 yes Figure 1 A structural schematic diagram of the second body and the third body of the central light combining component.

[0020] Fig.10 yes Figure 1 Another structural schematic diagram of the second body and the third body of the central light combining component.

[0021] Fig.11 yes Figure 1 Schematic cross-section of the optical combining unit.

[0022] Fig.12 It is a schematic diagram of simulation results provided in an embodiment of the present application.

[0023] Fig.13 This is another structural schematic diagram of the light source device provided in the embodiment of the present application.

[0024] Fig.14 This is another structural schematic diagram of the light source device provided in the embodiment of the present application.

[0025] Fig.15 It is a schematic diagram of the structure of the optical imaging system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order 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 in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0027] An embodiment of the present 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. It can be widely used in projection equipment (for example, micro projectors, short-focus projectors), laser TVs, engineering projectors, laser mosaic walls and other equipment.

[0028] See also 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 recycling component 40, and a light combining component 50. The excitation light source 10 is used to generate excitation light E. The fluorescence generator 20 is located on the optical path where the excitation light E is located. The fluorescence generator 20 is used to generate fluorescence F under the excitation of the excitation light E, wherein the fluorescence F may include a first sub-fluorescence F1 and a second sub-fluorescence F2. The supplementary light source 30 is used to generate supplementary light S.

[0029] The light recycling member 40 is located on the optical path where the fluorescence F is located, and the light recycling member 40 may include a first functional portion 410 and a second functional portion 420, wherein the first functional portion 410 is located on the optical path where the first sub-fluorescence F1 is located, and is used to reflect the first sub-fluorescence F1 to the fluorescence generator 20. The second functional portion 420 surrounds the periphery of the first functional portion 410, is located on the optical path where the second sub-fluorescence F2 is located, and is used to transmit the second sub-fluorescence F2.

[0030] The light combining member 50 is used to combine the supplementary light S and the second sub-fluorescent light F2 transmitted through the light recycling member 40 to generate the output light O. The light combining member 50 may include a third functional portion 510 and a fourth functional portion 520, wherein the third functional portion 510 is located on the optical path where the supplementary light S is located, so that the supplementary light S is emitted toward the specified direction M. The fourth functional portion 520 surrounds the outer periphery of the third functional portion 510 and is located on the optical path where the second sub-fluorescent light F2 is located, so that the second sub-fluorescent light F2 is emitted toward the specified direction M. The third functional portion 510 corresponds to the first functional portion 410 in the optical path.

[0031] In order to solve the problem of light combination loss of the fluorescence F, the present embodiment sets a light recycling member 40 on the optical path where the fluorescence F is located. The light recycling member 40 may include a first functional part 410 and a second functional part 420. The first functional part 410 is located on the optical path where the first sub-fluorescence F1 is located, and is used to reflect the first sub-fluorescence F1 to the fluorescence generator 20. The second functional part 420 surrounds the periphery of the first functional part 410 and is located on the optical path where the second sub-fluorescence F2 is located, and is used to transmit the second sub-fluorescence F2. The "first sub-fluorescence F1" refers to the part of the fluorescence that would be incident on the third functional part 510 if the light recycling member 40 is not set.

[0032] The light source device 100 in the present application is provided with a light recycling member 40, and the first functional part 410 and the third functional part 510 of the light recycling member 40 correspond to each other in the optical path, so that the first functional part 410 can reflect the first sub-fluorescence F1 that will be incident on the third functional part 510. Therefore, the light recycling member 40 in the present 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 combination, but will be emitted again at the fluorescence generator 20 in a form close to Lambertian luminescence, so that at least part of the first sub-fluorescence F1 emitted again through the fluorescence generator 20 can reach the fourth functional part 520 of the light combining member 50, thereby reducing the light combination loss of the fluorescence F and improving the light combination efficiency of the light source device 100.

[0033] The various components in the light source device 100 are introduced below.

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

[0035] In some possible embodiments, see Figure 2 , the excitation light source 10 may include a first laser generator 110 and a first light homogenizing device 120. The first laser generator 110 is used to generate excitation light E. The excitation light E 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 light homogenizing device 120 is arranged on the optical path where the excitation light E is located, and 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 light homogenizing device 120 may be a light homogenizing rod or a fly-eye lens. In this embodiment, the excitation light source 10 may further include a first converging lens 130. The first converging lens 130 is arranged on the optical path where the excitation light E emitted through the first light homogenizing device 120 is located, and is used to converge the excitation light E, thereby limiting the emission area of ​​the excitation light E.

[0036] In some other possible embodiments, see 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, and therefore, the excitation light E in this embodiment may be a blue LED light. The first lens group 160 is disposed on the optical path where the excitation light E is located, 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, and the first sub-lens 161 and the second sub-lens 163 are sequentially spaced along the optical path where the excitation light E is located to improve the collection efficiency of the excitation light E.

[0037] The fluorescence generator 20 is located on the optical path where the excitation light E is located. The fluorescence generator 20 is used to generate fluorescence F under the excitation of the excitation light E, wherein 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, see Figure 4 The fluorescence generator 20 may include a color wheel 210, and a fluorescent medium (not shown in the figure) may be provided on the side of the color wheel 210 facing the excitation light E, and the fluorescent medium generates fluorescence F under the excitation of the excitation light E. Specifically, the specific type of the fluorescent medium may be determined by the researchers based on the wavelength of the fluorescence F to be excited, and this embodiment does not specifically limit this.

[0039] In some other possible embodiments, see 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 by itself and can also generate green fluorescence under the excitation of the excitation light E. Therefore, the second LED light source 230 in this embodiment can increase the overall brightness of the green fluorescence by double-sided excitation, 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 on 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, and the third sub-lens 251 and the fourth sub-lens 253 are sequentially arranged at intervals along the optical path where the fluorescence F is located, so as to improve the collection efficiency of the fluorescence F.

[0041] The supplementary light source 30 is used to generate supplementary light S, and the supplementary light S is used to improve the overall combined light brightness of the light source device 100. Figure 6 The supplementary light source 30 may include a second laser generator 320, a second light homogenizing device 340, and a second converging lens 360, wherein the second laser generator 320 is used to generate supplementary light S. The supplementary light S in this embodiment may be a monochromatic laser or a multi-color mixed laser, for example, an RGB mixed laser. The color of the supplementary light S may be the same as or different from the color of the excitation light E, which is not specifically limited in this embodiment. Specifically, the second laser generator 320 may be a single laser generator or a laser generator array composed of multiple laser generators.

[0042] The second light homogenizer 340 is disposed on the optical path where the supplementary light S is located, and 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 light homogenizer 340 can be a light homogenizer rod or a fly-eye lens. In this embodiment, the second converging lens 360 is disposed on the optical path where the supplementary light S emitted through the second light homogenizer 340 is located, and is used to converge the supplementary light S, thereby limiting the emission area of ​​the supplementary light S.

[0043] The light recycling member 40 is located on the optical path where the fluorescence F is located, and the light recycling member 40 may include a first functional part 410 and a second functional part 420, wherein the first functional part 410 is located on the optical path where the first sub-fluorescence F1 is located, and is used to reflect the first sub-fluorescence F1 to the fluorescence generator 20. The second functional part 420 surrounds the periphery of the first functional part 410, is located on the optical path where the second sub-fluorescence F2 is located, and is used to transmit the second sub-fluorescence F2. Therefore, in this embodiment, the light recycling member 40 reflects 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 combination, but will be emitted again at the fluorescence generator 20 in a form close to Lambertian light, so that at least part of the first sub-fluorescence F1 emitted again through the fluorescence generator 20 can reach the fourth functional part 520 of the light combining member 50, thereby reducing the light combination loss of the fluorescence F and improving the light combination efficiency of the light source device 100.

[0044] See also Figure 7 and Figure 8, the light recycling member 40 may include a first body 430, a reflective layer 440 and a transmissive layer 450. The first body 430 is generally in the shape of a sheet (e.g., a circular sheet, a square sheet, etc.), which is used to fix and carry 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 the efficiency of light transmission. In this embodiment, the surface of the first body 430 is divided into a first area 4300 and a second area 4320 adjacent to each other. The first area 4300 may be roughly located in the central position of the first body 430, and the second area 4320 is arranged around the periphery of the first area 4300, wherein the first area 4300 is used to fix the reflective layer 440, and the second area 4320 is used to fix the transmissive layer 450. It should be noted here that the names of "first area" and "second area" are all named for the convenience of description. In a specific example, there may be a clear dividing line or no clear dividing line between the structures of the two. In this embodiment, the two are different areas of the first body 430.

[0045] In this embodiment, the reflective layer 440 covers the first area 4300 to form the first functional part 410, and the transmissive layer 450 covers the second area 4320 to form the second functional part 420. Specifically, the reflective layer 440 can be attached to the first area 4300, and the shape and area of ​​the reflective layer 440 are substantially the same as those of the first area 4300, so as to fully cover the first area 4300. The transmissive layer 450 can be attached to the second area 4320, and the shape and area of ​​the transmissive layer 450 are substantially the same as those of the second area 4320, so as to fully cover the second area 4320. Exemplarily, the reflective layer 440 can be a film layer that reflects the fluorescence F and transmits the 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 the corresponding areas of the first body 430 respectively through a coating process.

[0046] The light combining member 50 is used to combine the supplementary light S and the second sub-fluorescent light F2 transmitted through the light recycling member 40 to generate the output light O. The light combining member 50 may include a third functional portion 510 and a fourth functional portion 520, wherein the third functional portion 510 is located on the optical path where the supplementary light S is located, so that the supplementary light S is emitted toward a specified direction M. The fourth functional portion 520 surrounds the periphery of the third functional portion 510 and is located on the optical path where the second sub-fluorescent light F2 is located, so that the second sub-fluorescent light F2 is emitted toward a specified direction M. The specified direction M refers to the combined direction of the supplementary light S and the second sub-fluorescent light F2.

[0047] In this embodiment, the light combining element 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 circumference of the second body 530 .

[0048] In some possible embodiments, Fig. 9 As shown, the second body 530 and the third body 540 can be an integrally formed structure, that is, the second body 530 and the third body 540 can be made of the same transparent material (for example, glass). The names of "second body" and "third body" are named for the convenience of description. In a specific example, there may or may not be a clear dividing line between the two structures. In this embodiment, the two are different areas of the same piece of glass.

[0049] In some other possible embodiments, Fig.10 As shown, the third body 540 is roughly sheet-shaped (for example, round sheet-shaped, square sheet-shaped, etc.) and is provided with an avoidance gap 5400, which is roughly located at the center of the third body 540, and the second body 530 is passed through the avoidance gap 5400, so that the second body 530 is embedded in the avoidance gap 5400.

[0050] As an implementation mode, the width of the second body 530 can be slightly larger than the width of the avoidance notch 5400, that is, an interference fit occurs between the second body 530 and the avoidance notch 5400, so that the connection between the second body 530 and the third body 540 is more solid and reliable. It should be noted here that after the second body 530 is inserted into the avoidance notch 5400, there is still a partial gap in the avoidance 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 avoidance notch 5400, thereby avoiding the situation where the supplementary light S is blocked by the light combining member 50 when passing through the light combining member 50, thereby causing light energy loss, thereby improving the energy utilization efficiency of the supplementary light S.

[0051] As another embodiment, the light combining element 50 may further include a fixed bracket (not shown in the figure), which is roughly 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 and the plane where the third body 540 is located intersect (for example, the angle between the two is roughly 90 degrees), thereby improving the reliability of the connection between the second body 530 and the third body 540.

[0052] In this embodiment, the first coating layer 550 covers the second body 530 to form the third functional part 510, and the first coating layer 550 is used to transmit or reflect light. The second coating layer 560 covers the third body 540 to form the 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. Fig.11, which shows 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 an integrally formed structure. The first coating layer 550 can be attached to the second body 530, and the shape and area of ​​the first coating layer 550 are substantially the same as the shape and area of ​​the second body 530, so as to fully cover the second body 530. The second coating layer 560 can be attached to the third body 540, and the shape and area of ​​the second coating layer 560 are substantially the same as the shape and area of ​​the third body 540, so as to fully cover the third body 540.

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

[0054] In this embodiment, the projection area of ​​the third functional part 510 in the incident direction of the supplementary light S is greater than or equal to the light exiting 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 part 510 is located, so that the supplementary light S can be fully transmitted or reflected by the third functional part 510. Therefore, when the supplementary light source 30 is determined, the position and area of ​​the third functional part 510 are also determined.

[0055] In this embodiment, the area S1 of the first functional part 410 and the projection area S2 of the third functional part 510 in the incident direction N of the second sub-fluorescence F2 satisfy a specified first relationship, wherein the first relationship can be summarized by R&D personnel based on the specific optical path structure of the light source device 100, so that the first functional part 410 can fully reflect the first sub-fluorescence F1 incident on the third functional part 510, thereby improving the recovery efficiency of the first sub-fluorescence F1.

[0056] In some possible embodiments, Figure 5 As shown, Figure 5The fluorescence F in is generated by the excitation of the second LED light source 230, so the fluorescence F is emitted roughly in the form of parallel light. In this case, the sizes of S1 and S2 are roughly the same. Furthermore, after a large number of simulation experiments, the R&D personnel found that when the ratio between S1 and S2 satisfies the specified ratio interval, the fluorescence energy after light combination at the light combining member 50 is greater than the fluorescence energy when the light recycling member 40 is not set. 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 area where the first functional portion 410 is located is defined by a first line segment and at least one first line, and the area where the third functional portion 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 in the incident direction N of the second sub-fluorescent light F2 satisfy a specified second relationship, which is as follows:

[0059] L2*0.75≤L1≤L2*1.2.

[0060] Exemplarily, the first functional portion 410 and the third functional portion 510 may be approximately rectangular areas, the first line segment may be a side of the rectangle corresponding to the first functional portion 410, the second line segment may be a side of the rectangle corresponding to the third functional portion 510, and the first line segment and the second line segment correspond to each other on the optical path. In other possible examples, the first functional portion 410 and the third functional portion 510 may be approximately other polygonal areas (e.g., pentagons, hexagons, etc.), or may be irregularly shaped areas (e.g., semicircles). In other possible examples, the first functional portion 410 and the third functional portion 510 may also be approximately circular areas, in which case the geometric parameters of the first functional portion 410 and the third functional portion 510 only satisfy the first relational expression, but not the second relational expression.

[0061] See also Fig.12 , which shows the simulation experiment result diagram provided in the present application. Among them, the horizontal axis in the figure is the Lambertian reflectivity of the fluorescence generator 20, and the vertical axis is the fluorescence energy change value after light combination at the light combining component 50. Different curves represent the fluorescence energy change trend under different lengths of the first line segments, and the dotted line is the fluorescence energy change trend when the light recycling component 40 is not set. 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 at the first line segment will completely overlap with the second line segment located in the third functional part 510. Ideally, when the fluorescence F is emitted roughly in the form of parallel light, L1=L2=X0.

[0062] from Fig.12It is not difficult to find that when the length L1 of the first line segment is slightly smaller than L2, or slightly larger than L2, when the Lambertian reflectivity is greater than a certain value (for example, 70%), the fluorescence energy after light combination at the light combining member 50 is greater than the fluorescence energy when the light recycling member 40 is not provided. Therefore, when the R&D personnel determine the geometric parameters of the first functional part 410 according to the geometric parameters (for example, area, side length) of the third functional part 510, there can be a certain error, so that the R&D personnel can be more flexible in designing the first functional part 410.

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

[0064] Therefore, when researchers actually design the length L1 of the first line segment, they can design the length L1 to be slightly smaller than L2. For example, L1 can be approximately equal to 0.78*L2, thereby reducing the additional fluorescence light combination loss and improving the fluorescence recovery efficiency of the light recovery component 40.

[0065] In some other possible embodiments, the third functional portion 510 and the first functional portion 410 may be roughly in a conjugate relationship, that is, the third functional portion 510 and the first functional portion 410 are matched according to a certain rule. Specifically, the third functional portion 510 and the first functional portion 410 may be in an optically conjugate relationship. In this embodiment, "optically conjugate relationship" means that the third functional portion 510 and the first functional portion 410 form an image relative to the optical device between the two. It should be noted that the above-mentioned third functional portion 510 and the first functional portion 410 are in a conjugate relationship, which should be understood as: the third functional portion 510 and the first functional portion 410 are not required to be strictly conjugated, and the third functional portion 510 and the first functional portion 410 have a certain range of deviations on the basis of conjugation, and the above-mentioned deviations also belong to the category 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 recycling member 40 and the light combining member 50, and is used to converge the second sub-fluorescent light F2 between the light recycling member 40 and the light combining member 50. Figure 4 , Figure 4The fluorescence F in the color wheel 210 is excited and generated, so the second sub-fluorescence F2 will diffuse 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 converge and focus the second sub-fluorescence F2.

[0067] The relay module 60 may include a first lens 600 and a second lens 610, and the first lens 600 and the second lens 610 are sequentially located between the light recycling member 40 and the light combining member 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 a plurality of lenses, respectively. The number and specific implementation of the first lens 600 and the second lens 610 are not specifically limited in this embodiment. In this embodiment, by setting the first lens 600 and the second lens 610, the third functional portion 510 and the first functional portion 410 may be roughly in an optical conjugate relationship.

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

[0069]

[0070] In some possible embodiments, the area where the first functional portion 410 is located is defined by a first line segment and at least one first line, and the area where the second functional portion 420 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 in the incident direction of the second sub-fluorescent light F2 satisfy a specified second relationship, which is as follows:

[0071]

[0072] Exemplarily, the first functional portion 410 and the third functional portion 510 may be approximately rectangular areas, the first line segment may be a side of the rectangle corresponding to the first functional portion 410, the second line segment may be a side of the rectangle corresponding to the third functional portion 510, and the first line segment and the second line segment correspond to each other on the optical path. In other possible examples, the first functional portion 410 and the third functional portion 510 may be approximately other polygonal areas (e.g., pentagons, hexagons, etc.), or may be irregularly shaped areas (e.g., semicircles). In other possible examples, the first functional portion 410 and the third functional portion 510 may also be approximately circular areas, in which case the geometric parameters of the first functional portion 410 and the third functional portion 510 only satisfy the first relational expression, but not the second relational expression.

[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 portion 410 and the third functional portion 510 satisfy an optical conjugate relationship. That is, when the light emitted at the first line segment completely coincides with the second line segment located at the third functional portion 510, L1 and L2 satisfy the following formula:

[0074]

[0075] In some possible embodiments, L1 and L2 strictly satisfy In this case, the fluorescent energy reflected by the first functional part 410 will be greater than the fluorescent energy lost at the third functional part 510. This is because the first functional part 410 not only reflects the fluorescent energy at the corresponding angle lost in the area where the third functional part 510 is located, but also reflects some fluorescent energy with larger emission angles. As a result, part of the fluorescent energy that would originally be transmitted to the fourth functional part 520 will also be reflected by the first functional part 410.

[0076] Therefore, when the R&D personnel actually designs the length L1 of the first line segment, the length L1 can be designed to be slightly smaller than For example, L1 can be approximately equal to This can reduce the extra fluorescence light combination loss and improve the fluorescence recovery efficiency of the light recovery element 40.

[0077] In some possible embodiments, the first lens 600 and the second lens 610 may be coaxially arranged, and the third functional portion 510 may be located at the optical axis center of the second lens 610, and be coaxial with the light spot of the fluorescence F. Specifically, the relay module 60 may further include a first light homogenizer 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 light homogenizer 620 may be a light homogenizer rod or a compound eye lens.

[0078] In some other possible embodiments, see Fig.13 , the first lens 600 and the second lens 610 can be arranged off-axis, and the relay module 60 can also include a second light homogenizer 640 and a first reflector 650, the first reflector 650 and the second light homogenizer 640 are sequentially located between the first lens 600 and the second lens 610, and the first reflector 650 is used to reflect the second sub-fluorescence F2 emitted through the first lens 600 to the second light homogenizer 640. The second light homogenizer 640 is used to homogenize the second sub-fluorescence F2 and make it incident on the second lens 610. Specifically, the second light homogenizer 640 can be a light homogenizer rod or a fly-eye lens.

[0079] In this embodiment, the second light homogenizer 640 and the first reflector 650 are respectively arranged on opposite sides of the color wheel 210, and the color wheel 210 can also be used to transmit the second sub-fluorescence F2 between the second light homogenizer 640 and the first reflector 650. Among them, the color wheel 210 may include a first functional area (not shown in the figure) and a second functional area (not shown in the figure), and the first functional area is arranged on the optical path where the excitation light E is located, and is used to generate and reflect fluorescence F under the excitation of the excitation light. The second functional area is arranged between the second light homogenizer 640 and the first reflector 650, and is used to transmit the second sub-fluorescence F2. In this embodiment, by folding the optical path to a certain extent, the overall structure of the light source device 100 is made more compact, which is conducive to the miniaturization design of the device provided 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 further include a fly-eye lens 690. Figure 5 The third lens 670 is disposed between the light recycling member 40 and the light combining member 50, and is used to converge the second sub-fluorescence F2 between the light recycling member 40 and the light combining member 50, thereby limiting the light angle of the second sub-fluorescence F2. The fly-eye lens 690 is disposed on the optical path of the outgoing light O, and is used to homogenize the outgoing light O generated after the light is combined by the light combining member 50, so as to improve the uniformity of the outgoing light O. Since the third lens 670 is used to shrink the light angle of the second sub-fluorescence F2 in this embodiment, the light angle of the second sub-fluorescence F2 can meet the angle requirement of the fly-eye lens 690 for the incident light, so that the fly-eye lens 690 can fully homogenize the second sub-fluorescence F2 in the outgoing light O.

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

[0082] Please refer again Figure 4, the color filter 70 may include a first dichroic filter 700, and the first dichroic filter 700 is used to reflect the excitation light E to the color wheel 210, and transmit the second sub-fluorescence F2 to the light combining member 50. The excitation light E in this embodiment may include a first sub-excitation light E1 (not shown in the figure) and a second sub-excitation light E2, wherein 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 combining member 50 after passing through the color wheel 210. Specifically, the surface of the first dichroic filter 700 may be coated with a film layer that reflects blue laser and transmits fluorescence.

[0083] In this embodiment, when the excitation light E is incident on the color wheel 210, a part of the excitation light E (that is, the first sub-excitation light E1) will be converted into fluorescence F under the excitation of the color wheel 210, and the other part of the excitation light E (that is, the second sub-excitation light E2) will be transmitted through the color wheel 210 and emitted to the light combining component 50. Therefore, the excitation light E in this embodiment can not only be used to excite the fluorescence F, but also participate in the subsequent light combining, thereby improving the utilization efficiency of the excitation light E, and further improving 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 on the optical path of the second sub-excitation light E2 transmitted through the color wheel 210, and are used to reflect the second sub-excitation light E2 transmitted through the color wheel 210 to the first dichroic plate 700, and the first dichroic plate 700 is also used to reflect the second sub-excitation light E2 to the light combiner 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, and the second sub-excitation light E2 transmitted through the color wheel 210 is incident on the first dichroic plate 700 after being reflected by the second reflector 711, the third reflector 713, and the fourth reflector 715. Among them, the third reflector 713 and the fourth reflector 715 are arranged on opposite sides of the color wheel 210, which can make the reflected optical path of the second sub-excitation light E2 more compact, which is conducive to the miniaturization design of the device provided with the light source device 100.

[0085] It is not difficult to understand here that due to Figure 4 The embodiment shown uses laser as the excitation light E. Therefore, based on the good collimation of the laser, the second sub-excitation light E2 will not cause a large energy loss after multiple reflections, thereby ensuring the utilization efficiency of the second sub-excitation light E2. Figure 4In the illustrated embodiment, the light source device 100 may further include a first focusing lens 717 and a second focusing lens 719, wherein the first focusing lens 717 is disposed between the color wheel 210 and the second reflector 711, and the second focusing lens 719 is disposed between the second reflector 711 and the third reflector 713, and 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 again Figure 5 The color filter 70 may include a second dichroic filter 720 , and the second dichroic filter 720 is used to reflect the excitation light E to the second LED light source 230 and transmit the second sub-fluorescent light F2 to the light combining element 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 the first designated light D1 is smaller than the wavelength of the fluorescent light 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 on the optical path where the first designated light D1 is located, 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. The fifth sub-lens 831 and the sixth sub-lens 833 are sequentially arranged at intervals along the optical path where the first designated light D1 is located, so as to improve the collection efficiency of the first designated light D1.

[0088] The second dichroic plate 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 providing 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, wherein the fourth LED light source 850 is used to generate a second designated light D2, wherein the wavelength of the second designated light D2 is greater than the wavelength of the fluorescent light F. For example, the second designated 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 on the optical path where the second designated light D2 is located, and is used to collect the second designated 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, and the seventh sub-lens 871 and the eighth sub-lens 873 are sequentially arranged at intervals along the optical path where the second designated light D2 is located, so as to improve the collection efficiency of the second designated light D2.

[0090] The light combining member 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 setting the third LED light source 810. Figure 5 In the illustrated embodiment, three-color LED light can be provided respectively by the second LED light source 230, the third LED light source 810 and the fourth LED light source 850. When the supplementary light source 30 provides RGB mixed laser, the combination of three-color laser and three-color LED light is achieved, thereby ensuring the application scenario of the light source device 100.

[0091] Please refer again Fig.13 , the color filter 70 may include a third dichroic filter 730, and the third dichroic 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 combining component 50. The excitation light E in this embodiment may include a first sub-excitation light E1 (not shown in the figure) and a second sub-excitation light E2, wherein 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 combining component 50 after passing through the color wheel 210. Specifically, the surface of the third dichroic filter 730 may be coated with a film layer that reflects blue laser and fluorescence.

[0092] In the present embodiment, when the excitation light E is incident on the color wheel 210, a part of the excitation light E (that is, the first sub-excitation light E1) will be converted into fluorescence F under the excitation of the color wheel 210, and the other part of the excitation light E (that is, the second sub-excitation light E2) will be reflected by the color wheel 210 and emitted to the light combining component 50. Therefore, the excitation light E in the present embodiment can not only be used to excite the fluorescence F, but also participate in the subsequent light combining, thereby improving the utilization efficiency of the excitation light E, and further improving 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 (for example, 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 from overlapping, so that the subsequent second sub-excitation light E2 can be smoothly emitted to the light combining component 50.

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

[0094] See also Fig.14 , the color filter 70 may include a fourth dichroic filter 740, which is a regional dichroic filter, and the fourth dichroic filter 740 includes a transmission function part 741 and a reflection function part 743. The transmission function part 741 is used to transmit the excitation light E to the color wheel 210. The reflection function part 743 surrounds the outer periphery of the transmission function part 741, and is used to reflect the second sub-fluorescence F2 to the light combining part 50. The excitation light E in this embodiment may include a first sub-excitation light E1 (not shown in the figure) and a second sub-excitation light E2, wherein 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 combining part 50 after passing through the color wheel 210. Specifically, the transmission function part 741 of the fourth dichroic filter 740 may be coated with a film layer that transmits blue laser and reflects fluorescence, and the reflection function part 743 may be coated with a film layer that reflects blue laser and fluorescence.

[0095] In the present embodiment, when the excitation light E is incident on the color wheel 210, a part of the excitation light E (that is, the first sub-excitation light E1) will be converted into fluorescence F under the excitation of the color wheel 210, and the other part of the excitation light E (that is, the second sub-excitation light E2) will be reflected by the color wheel 210 and then emitted to the light combining component 50. Therefore, the excitation light E in the present embodiment can not only be used to excite the fluorescence F, but also participate in the subsequent light combining, thereby improving the utilization efficiency of the excitation light E, and further 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 plate 740 is located, and the second sub-excitation light E2 is emitted to the light combining component 50 via the reflection function part 743. Therefore, the present embodiment and Fig.13 Compared with the embodiment shown in the figure, one less reflector can be provided (that is, Fig.13 The fifth reflector 712 in the light source device 100 is provided, thereby saving the hardware cost of the light source device 100.

[0096] The present application also provides an optical imaging system 900, which is provided with the above-mentioned light source device 100, and can be widely used in projection equipment (for example, micro projectors, short-throw projectors), laser TVs, engineering projectors, laser mosaic walls and other equipment. Fig.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 an outgoing light O. The specific structure of the light source device 100 can refer to the relevant description in the above embodiment. The lens module 910 is arranged on the optical path where the outgoing light O is located, and plays a role in converging the outgoing light O. Specifically, the lens module 910 may include a single lens or a lens group composed of multiple lenses.

[0098] The prism module 920 is disposed between the lens module 910 and the light modulator 930, and is used to reflect the outgoing light O and focus it on the light modulator 930. The light modulator 930 is used to perform image modulation on the light and form light carrying image information. The prism module 920 is also used to transmit the light carrying image information to the projection area, such as a wall, a projection screen, and the like.

[0099] Specifically, the light modulator 930 may be a digital micromirror device (DMD), which is composed of a digital micromirror array, each digital micromirror constituting a modulation unit, and a modulation unit is used to modulate an image corresponding to a pixel. Each digital micromirror is flipped under the drive of a driving signal generated by a control device, and the number of flips of each digital micromirror is determined by the driving signal. The flipped digital micromirror modulates the light reflected by the prism module 920 and forms light carrying image information.

[0100] The present embodiment provides a light source device 100 and an optical imaging system 900 provided 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 recycling component 40, and a light combining component 50. The excitation light source 10 is used to generate excitation light E. The fluorescence generator 20 is located on the optical path where the excitation light E is located, and the fluorescence generator 20 is used to generate fluorescence F under the excitation of the excitation light E, wherein the fluorescence F may include a first sub-fluorescence F1 and a second sub-fluorescence F2. The supplementary light source 30 is used to generate supplementary light S.

[0101] The light recycling member 40 is located on the optical path where the fluorescence F is located, and the light recycling member 40 may include a first functional portion 410 and a second functional portion 420, wherein the first functional portion 410 is located on the optical path where the first sub-fluorescence F1 is located, and is used to reflect the first sub-fluorescence F1 to the fluorescence generator 20. The second functional portion 420 surrounds the periphery of the first functional portion 410, is located on the optical path where the second sub-fluorescence F2 is located, and is used to transmit the second sub-fluorescence F2.

[0102] The light combining member 50 is used to combine the supplementary light S and the second sub-fluorescent light F2 transmitted through the light recycling member 40 to generate the output light O. The light combining member 50 may include a third functional portion 510 and a fourth functional portion 520, wherein the third functional portion 510 is located on the optical path where the supplementary light S is located, so that the supplementary light S is emitted toward the specified direction M. The fourth functional portion 520 surrounds the outer periphery of the third functional portion 510 and is located on the optical path where the second sub-fluorescent light F2 is located, so that the second sub-fluorescent light F2 is emitted toward the specified direction M. The area S1 of the first functional portion 410 and the projection area S2 of the third functional portion 510 on the incident direction N of the second sub-fluorescent light F2 satisfy the specified first relational expression.

[0103] In order to solve the problem of light combination loss of the fluorescence F, the present embodiment sets a light recycling member 40 on the optical path where the fluorescence F is located. The light recycling member 40 may include a first functional part 410 and a second functional part 420. The first functional part 410 is located on the optical path where the first sub-fluorescence F1 is located, and is used to reflect the first sub-fluorescence F1 to the fluorescence generator 20. The second functional part 420 surrounds the periphery of the first functional part 410 and is located on the optical path where the second sub-fluorescence F2 is located, and is used to transmit the second sub-fluorescence F2. The "first sub-fluorescence F1" refers to the part of the fluorescence that would be incident on the third functional part 510 if the light recycling member 40 is not set.

[0104] The light source device 100 in the present application is provided with a light recycling member 40, and the first functional part 410 and the third functional part 510 of the light recycling member 40 correspond to each other in the optical path, so that the first functional part 410 can reflect the first sub-fluorescence F1 that will be incident on the third functional part 510. Therefore, the light recycling member 40 in the present 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 combination, but will be emitted again at the fluorescence generator 20 in a form close to Lambertian luminescence, so that at least part of the first sub-fluorescence F1 emitted again through the fluorescence generator 20 can reach the fourth functional part 520 of the light combining member 50, thereby reducing the light combination loss of the fluorescence F and improving the light combination efficiency of the light source device 100.

[0105] In the specification of this application, certain words are used to refer to specific components in the specification and claims. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of the components as the criterion for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to"; "substantially" means that those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0106] In the description of the present application, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", and "inside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are merely simplified descriptions for the convenience of describing the present application. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0107] In this application, unless otherwise clearly specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be internal communication between two elements, or it can be only surface contact. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0108] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0109] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements 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 the present application.

Claims

1. A light source device, characterized in that: include: An excitation light source, used to generate excitation light; A fluorescence generator is located on 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; A supplementary light source, used to generate supplementary light; a light recycling member located on the optical path where the fluorescence is located; the light recycling member comprises a first functional part and a second functional part, the first functional part being located on the optical path where the first sub-fluorescence is located and used to reflect the first sub-fluorescence to the fluorescence generator; the second functional part surrounding the periphery of the first functional part, being located on the optical path where the second sub-fluorescence is located and used to transmit the second sub-fluorescence; as well as A light combining component is used to combine the supplementary light and the second sub-fluorescence after being transmitted through the light recycling component to generate output light; the light combining component includes a third functional part and a fourth functional part, the third functional part is located on the optical path where the supplementary light is located, so that the supplementary light is emitted in a specified direction; the fourth functional part surrounds the periphery of the third functional part and is located on the optical path where the second sub-fluorescence is located, so that the second sub-fluorescence is 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 projection 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 area where the first functional part is located is defined by a first line segment and at least one first line, and the area where the third functional part 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 in the incident direction of the second sub-fluorescence satisfy a specified second relationship, and the second relationship 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 portion and the first functional portion are in a conjugate relationship.

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 recycling component and the light combining component and is used to converge the second sub-fluorescence between the light recycling component and the light combining component.

6. The light source device according to claim 5, characterized in that: The relay module includes a first lens and a second lens, and the first lens and the second lens are sequentially located between the light recycling component and the light combining component; 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 projection area S2 of the third functional part in the incident direction of the second sub-fluorescence satisfy a specified first relationship, and the first relationship is as follows:

7. The light source device according to claim 6, characterized in that: The area where the first functional part is located is defined by a first line segment and at least one first line, and the area where the third functional part 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 in the incident direction of the second sub-fluorescence satisfy a specified second relationship, and the second relationship 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 comprises a first light homogenizer, and the first light homogenizer 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 also includes a second light homogenizer and a first reflector, and the first reflector and the second light homogenizer are located between the first lens and the second lens respectively; the first reflector is used to reflect the second sub-fluorescence emitted through the first lens to the second light homogenizer.

9. The light source device according to claim 1, characterized in that: The light recycling member comprises a first body, a reflective layer and a transmissive layer, wherein a surface of the first body is divided into a first area and a second area adjacent to each other; The reflective layer covers the first region to form the first functional portion; the transmissive layer covers the second region to form the second functional portion.

10. The light source device according to claim 1, characterized in that: The light combining element comprises a second body, a third body, a first coating layer and a second coating layer, and 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: A projection area of ​​the third functional portion in the incident direction of the supplementary light is greater than or equal to a 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, which is located on the optical path of the excitation light and the second sub-fluorescence light, and is used to make the excitation light emit toward the fluorescence generator, and make the second sub-fluorescence light emit toward the light combining element; The light recycling member is arranged on a side of the color sheet facing the fluorescent 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 component.

14. The light source device according to claim 13, characterized in that: The light source device further comprises a third LED light source, the third LED light source is used to generate a first designated light, the wavelength of the first designated light is smaller than the wavelength of the fluorescence; The color filter is also used to reflect the first designated light to the light combining component.

15. The light source device according to claim 13, characterized in that: The light source device further comprises a fourth LED light source, the fourth LED light source is used to generate a second designated light, the wavelength of the second designated light is greater than the wavelength of the fluorescent light; The light combining element is further used for reflecting 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 output light; as well as The optical modulator is arranged on the optical path where the outgoing light is located.

Images