Light source device, lighting system and projection system
By introducing an angle diffusion element into the light source device to expand the beam angle of the second light, the problem of insufficient uniformity of the combined light beam in the laser remote fluorescence technology is solved, and good uniformity of the light spot is achieved.
Patent Information
- Application Number
- CN202421569923.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-03
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-03
AI Technical Summary
In laser remote fluorescence technology, the beam uniformity formed by combining light is insufficient, resulting in uneven color of the spot.
Angle diffusion elements are introduced into the light source device to expand the beam angle of the second light so that it diffuses before scattering the reflective element, thereby changing the size and light intensity distribution of the light spot and improving the uniformity of the combined light spot.
By adding the angle diffusion element, the difference in the spot size and light intensity distribution of the emitted light of the wavelength conversion element and the scattering reflective element is made up, and the color uniformity of the combined light spot is significantly improved.
Smart Images
Figure CN222774729U_ABST
Abstract
Description
[Technical field]
[0001] The present application relates to the field of lighting and projection technology, and in particular to a light source device, a lighting system and a projection system. [Background technology]
[0002] Laser remote fluorescence technology uses laser to excite distant fluorescent materials to obtain stimulated light, and then combines the stimulated light with other light beams in different wavelength ranges to obtain white light or other different colors of light for application in lighting, projection and other scenarios.
[0003] The uniformity of the light beam formed by combined light has always been a difficulty and pain point that restricts the development of laser remote fluorescence technology. Taking the example of blue excitation light stimulating fluorescent materials to produce yellow stimulated light, the relative ratio of blue excitation light to yellow stimulated light can make the central area of the combined light show a good white spectrum, but in the surrounding area of the combined light, it often shows an obvious yellow aperture, that is, the entire area of the combined light spot often has color unevenness. [Contents of the utility model]
[0004] An object of the embodiments of the present application is to provide a light source device for improving the color uniformity of emitted light.
[0005] To achieve the above objectives, in one aspect, an embodiment of the present application provides a light source device, including:
[0006] A light emitting component, used for emitting excitation light;
[0007] A light splitting and combining element receives the excitation light and splits the excitation light into a first light and a second light traveling in different directions;
[0008] a wavelength conversion element, configured to receive the first light and convert at least a portion of the first light into a third light having a different wavelength range;
[0009] a scattering reflective element, configured to receive the second light, scatter the second light and return the scattered second light; and
[0010] an angle diffusion element, disposed on an optical path of the second light between the light emitting assembly and the scattering and reflecting element, and configured to expand a beam angle of the second light before the second light is incident on the scattering and reflecting element; and
[0011] The light-splitting and light-combining element is further used to receive the second light from the scattering and reflecting element and the third light from the wavelength conversion element, and combine the second light with the third light.
[0012] In some possible implementations, the diffusion angle of the angle diffusion element ranges from 0.4 degrees to 5 degrees.
[0013] In some possible implementations, the angle diffusion element is further used to receive the second light returned by the scattering reflection element and further expand the beam angle of the second light.
[0014] In some possible implementations, the wavelength conversion element includes a wavelength conversion layer, and a reflective layer is disposed on a side of the wavelength conversion layer facing away from the incident direction of the first light;
[0015] The wavelength conversion layer includes a first matrix in which wavelength conversion particles are distributed.
[0016] In some possible implementations, the scattering reflective element includes a second matrix, in which first scattering particles are distributed, wherein the first scattering particles scatter the second light in a non-excited form.
[0017] In some possible implementations, the scattering reflective element includes a second matrix, in which first scattering particles are distributed, wherein the first scattering particles scatter the second light in a reflection or refraction manner.
[0018] In some possible implementations, the angle diffusion element includes a third matrix, in which second scattering particles are distributed, and the second scattering particles expand the beam angle of the second light by reflection or refraction.
[0019] In some possible implementations, a microstructure is disposed on the light incident surface and / or the light exiting surface of the angle diffusion element, and the microstructure is used to expand the beam angle of the second light.
[0020] In some possible implementations, a first collecting lens is further included, which is disposed between the light combining element and the wavelength conversion element and is used to converge the first light to the wavelength conversion element and collect the third light from the wavelength conversion element.
[0021] In some possible embodiments, a second collecting lens is further included, which is arranged between the light splitting and combining element and the angle diffusion element, or between the angle diffusion element and the scattering and reflecting element, and is used to converge the second light to the scattering and reflecting element and collect the second light from the scattering and reflecting element.
[0022] In a second aspect, an embodiment of the present application further provides a lighting system, comprising the light source device as described above.
[0023] In a third aspect, an embodiment of the present application further provides a projection system, comprising the light source device as described above.
[0024] Beneficial effects of this application:
[0025] The light source device provided in the embodiment of the present application adds an angle diffusion element to the optical path of the scattering and reflecting element to expand the beam angle of the second light before the second light is incident on the scattering and reflecting element, so as to increase the size of the light spot formed by the second light incident on the scattering and reflecting element, and change the relative ratio between the light intensity of the central area of the second light and the light intensity of the surrounding area, thereby compensating for the spot size and light intensity distribution of the second light returned by the scattering and reflecting element and the third light emitted by the wavelength conversion element, so that the light spot formed by the second light returned by the scattering and reflecting element and the third photosynthetic light emitted by the wavelength conversion element has good uniformity.
Brief Description of the Drawings
[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:
[0027] Figure 1 A schematic diagram of a light source device according to an embodiment of the present application;
[0028] Figure 2 for Figure 1 A schematic illustration of a light spot formed on a distant screen by a light beam emitted by a light source device;
[0029] Figure 3 for Figure 1 A light distribution curve of a light beam emitted by a scattering reflective element and a wavelength conversion element in a light source device;
[0030] Figure 4a for Figure 1 Schematic diagram of the change of the light spot on the optical path where the scattering reflective element is located;
[0031] Figure 4b for Figure 1 Schematic diagram of the change of the light spot on the optical path where the wavelength conversion element is located;
[0032] Figure 4c for Figure 1 Schematic diagram of the light spot of the light beam formed by combining the light beams emitted by the scattering reflection element and the wavelength conversion element;
[0033] Figure 5 A schematic diagram of a light source device according to an embodiment of the present application;
[0034] Figure 6 This is a schematic diagram of the structure of a wavelength conversion element in an embodiment of the present application;
[0035] Figure 7 A schematic diagram of a light source device according to an embodiment of the present application;
[0036] Figure 8 for Figure 7 A schematic illustration of a light spot formed by a light source device on a distant screen;
[0037] Figure 9a A schematic diagram of the change of the light spot after an angle diffusion element is set on the optical path where the scattering reflection element is located;
[0038] Figure 9b It is a schematic diagram of the change of the light spot when no angle diffusion element is arranged on the optical path where the scattering reflection element is located;
[0039] Fig.10a A schematic diagram of the change of the light spot after an angle diffusion element is arranged on the optical path where the scattering reflection element is located;
[0040] Fig.10b Schematic diagram of the light spot change in the optical path where the wavelength conversion element is located. [Specific implementation method]
[0041] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limitations on the present application. In the description of the present application, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number or arrangement order of the indicated technical features. Thus, the technical features defined as "first" and "second" may explicitly or implicitly include one or more of the technical features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.
[0042] In the description of this application, it should be noted that, unless otherwise clearly specified or limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0043] The disclosure below provides many different embodiments or examples to implement the different structures of the present application. In order to simplify the disclosure of the present application, only the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the present application. In addition, the present application may reuse reference numerals and / or reference letters in different examples, and this repetition is to simplify and clearly state the present application, which itself does not indicate the specific relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and materials provided in the description below are only examples for implementing the technical solutions of the present application, but those of ordinary skill in the art should be aware that the technical solutions of the present application may also be implemented by other processes and / or other materials not described below.
[0044] Further, described features, structures can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided so that the embodiments of the present application can be fully understood. However, those skilled in the art will appreciate that, even without one or more of the specific details, or adopting other structures, components etc., the technical scheme of the present application can also be put into practice. In other cases, known structures or operations are not shown or described in detail to avoid blurring the key points of the present application.
[0045] In previous research progress, the applicant designed a light source device, such as Figure 1 As shown, the light source device includes a laser light source 100, a wavelength conversion element 200, a scattering reflection element 300 and a spectroscopic element 500. The laser light source 100 emits laser light, which is incident on the spectroscopic element 500. The spectroscopic element 500 transmits part of the laser light to the wavelength conversion element 200 and reflects part of the laser light to the scattering reflection element 300. The wavelength conversion element 200 converts at least part of the incident laser light into a converted light with a different wavelength range. The generated converted light returns to the spectroscopic element 500 and is reflected by the spectroscopic element 500. The scattering reflection element 300 scatters the laser light from the spectroscopic element 500 and reflects the scattered laser light back to the spectroscopic element 500. The spectroscopic element 500 at least partially transmits the laser light from the scattering reflection element 300. The converted light reflected by the spectroscopic element 500 and the laser light transmitted by the spectroscopic element 300 are spatially synthesized into a beam of light.
[0046] In previous studies, the applicant believes that the converted light generated after the laser excites a wavelength conversion element such as a fluorescent material is basically emitted in the form of a Lambertian light distribution, and the scattering and reflecting element 300 also basically changes the light distribution of the laser into a basic Lambertian light distribution and reflects it back through the scattering and reflecting effect on the laser. Therefore, a uniform light spot can be obtained after the converted light from the wavelength conversion element 200 and the laser from the scattering and reflecting element 300 are combined.
[0047] The applicant Figure 1 The light source device shown was experimentally verified, as Figure 2 As shown, Figure 1 The light spot formed by the light source device on the distant screen is shown in the figure, wherein the laser light source 100 emits blue laser light, and the wavelength conversion element 200 includes yellow fluorescent material, that is, the wavelength conversion element 200 converts the blue laser light at least partially into yellow converted light. The applicant unexpectedly found that although the uniformity of the light spot formed on the distant screen is improved to a certain extent, it still shows a considerable degree of non-uniformity. Figure 2 In the image, the color of the center area of the light spot is blue, while the color of the surrounding area of the light spot is yellow.
[0048] According to the results of the above experiments, the applicant believes that the reason for the color non-uniformity of the light spot is the inconsistency of the light distribution of the converted light emitted by the wavelength conversion element 200 and the laser light returned by the scattering reflection element 300. In the central area of the light spot formed by the combined light, the ratio of the laser light returned by the scattering reflection element 300 to the converted light emitted by the wavelength conversion element 200 is too high, while in the surrounding area of the light spot formed by the combined light, the ratio of the laser light returned by the scattering reflection element 300 to the converted light emitted by the wavelength conversion element 200 is too low. It can be foreseen that even by adjusting the ratio of the laser light incident on the wavelength conversion element 200 to the laser light incident on the scattering reflection element 300, only the uniformity of the local area of the light spot can be adjusted, for example, the ratio of the laser light incident on the wavelength conversion element 200 can be increased or the ratio of the laser light incident on the scattering reflection element 300 can be reduced, and the central area of the light spot will obtain a white light spot after combining the light, but the yellow light spot in the surrounding area will be more obvious.
[0049] Based on this, the applicant has studied the light beams emitted by the wavelength conversion element 200 and the scattering reflection element 300, such as Figure 3 , shows the light distribution curves of the stimulated light emitted by the wavelength conversion element 4 and the laser light emitted by the scattering reflection element 2, Figure 3Curve a in the middle represents the light distribution curve of the converted light emitted by the wavelength conversion element 200, and curve b represents the light distribution curve of the laser emitted by the scattering reflection element 300. Among them, the central area of curve a is significantly lower than the central area of curve b, so when the light is combined, the color of the central area of the light spot is blue, and in the edge area of curve a and curve b, the edge area of curve a is slightly higher than the edge area of curve b. When the converted light is combined with the laser emitted by the scattering reflection element 300, the proportion of the converted light (yellow light) in the edge area of the combined light is higher, which causes the light spot in the edge area to be yellow. Therefore, the applicant believes that the wavelength conversion element 200 and the scattering reflection element 300 have obvious differences in the changes in the light distribution of the laser, and the wavelength conversion element 200 and the scattering reflection element 300 have obvious differences in the changes in the central area and the surrounding area of the laser.
[0050] The applicant believes that there are many reasons for the inconsistency in the changes in the laser light distribution by the wavelength conversion element 200 and the scattering reflection element 300. One of them is that the conversion efficiency of the laser light is different at different positions of the wavelength conversion element 200. The conversion efficiency of the wavelength conversion element 200 for the laser light changes with the change of its own temperature. When the temperature of the wavelength conversion element 200 is too high, the conversion efficiency of the wavelength conversion element 200 for the laser light will drop significantly. Figure 1 In the light source device shown, the light intensity of the central area of the laser is high, and the light intensity of the surrounding area is low. As the wavelength conversion element 200 converts the laser, heat gradually accumulates in the central area of the laser, causing the local temperature to rise, thereby causing the conversion efficiency of the wavelength conversion element 200 to the laser in the central area to decrease. In the surrounding area of the laser, due to the relatively low light intensity, the accumulation of heat in the local area and the dissipation of heat are basically balanced. Compared with the central area, the conversion efficiency of the wavelength conversion element 200 to the surrounding area of the laser remains relatively high. Therefore, the converted light emitted by the wavelength conversion element 200 shows that the light intensity of the central area is relatively reduced, and the light intensity of the surrounding area is relatively increased. In comparison, the scattering reflection element 300 does not convert the wavelength of the laser, so the relative proportion of the central area and the surrounding area of the emitted laser will not change significantly due to heat accumulation.
[0051] The heat accumulation of the wavelength conversion element 200 causes the relative proportion of the central area of the emitted converted light to decrease, which to some extent explains the Figure 2 The problem that the color of the central area of the combined light of the laser and the laser is blue is not enough to explain why the color of the surrounding area of the combined light is yellow. The applicant further studied the light spots of the outgoing light of the wavelength conversion element 200 and the scattering reflection element 300, and found that the size of the light spot of the laser on the outgoing surface of the wavelength conversion element 200 is significantly larger than the size of the laser on the outgoing surface of the scattering reflection element 300.
[0052] The applicant believes that the main reason for the difference in the spot size of the emitted light of the wavelength conversion element 200 and the scattering reflection element 300 is that the wavelength conversion element 200 and the scattering reflection element 300 have different effects on the laser. The wavelength conversion element 200 changes the light distribution of the laser through the excitation of the wavelength conversion material such as phosphor on the laser. The stimulated light generated by the wavelength conversion material excited by the laser is randomly emitted in all directions, which leads to the obvious lateral diffusion phenomenon of the generated stimulated light compared with the incident laser, that is, the generated stimulated light expands in the lateral direction inside the wavelength conversion element 4, so the stimulated light emitted from the exit surface of the wavelength conversion element 200 has a significantly enlarged spot. Although the scattering reflection element 300 also randomly changes the direction of the incident laser, it mainly changes the direction of the laser by reflection, refraction, etc., so the diffusion of the laser in the lateral direction of the scattering reflection element 300 is limited. Therefore, the spot of the stimulated light emitted by the wavelength conversion element 200 is larger than the spot of the laser emitted by the scattering reflection element 300, and the color of the area around the spot after the two are combined is obviously yellow.
[0053] Referring to FIG. 4 , Figure 4a Shows Figure 1 Schematic diagram of the laser spot on the optical path where the scattering reflective element is located; Figure 4b Shows Figure 1 Schematic diagram of the laser and stimulated light spots on the spot where the wavelength conversion element is located; Figure 4c Shows Figure 1 A light beam formed by combining the converted light emitted by the wavelength conversion element and the laser light emitted by the scattering and reflecting element. Figure 4a In the embodiment, the scattering reflective element 300 scatters the laser light, thus enlarging the spot size of the returning laser light to a certain extent, but the degree of change is relatively small. Figure 4b In the figure, when the laser is incident on the wavelength conversion element 200, the size of the spot formed on the incident surface of the wavelength conversion element 200 is basically the same as the size of the spot formed when the laser is incident on the incident surface of the scattering and reflecting element 300. However, when the wavelength conversion element 200 converts at least part of the laser into converted light and emits it, the size of the spot formed on the exit surface of the wavelength conversion element 200 has increased significantly. At this time, the spot size of the emitted converted light on the exit surface of the wavelength conversion element 200 is significantly larger than the spot size of the laser on the exit surface of the scattering and reflecting element 300. Figure 4cIn the light beam formed by the combination of the converted light emitted by the wavelength conversion element 200 and the laser returned by the scattering reflection element 300, it can be found that the spot size and the divergence angle of the converted light emitted by the wavelength conversion element 200 and the laser returned by the scattering reflection element 2 are obviously inconsistent. The spot size of the converted light is larger than the spot size of the laser, and the divergence angle of the converted light is smaller than the divergence angle of the laser.
[0054] Based on the above research, the applicant designed a light source device, such as Figure 5 The light source device includes: a light-emitting component 100, a wavelength conversion element 200, a scattering and reflecting element 300, an angle diffusion element 400, and a light-splitting and light-combining element 500. The light-emitting component 100 is used to emit excitation light; the light-splitting and light-combining element 500 is used to receive the excitation light and divide the excitation light into a first light and a second light traveling in different directions; the wavelength conversion element 200 is used to receive the first light and convert at least part of the first light into a third light with a different wavelength range; the scattering and reflecting element 300 is used to receive the second light, scatter the second light and return the scattered second light; the angle diffusion element 400 is arranged on the optical path of the second light between the light-splitting and light-combining element 500 and the scattering and reflecting element 300, and is used to expand the beam angle of the second light before the second light is incident on the scattering and reflecting element 300. The light-splitting and light-combining element 500 is also used to receive the second light returned from the scattering and reflecting element 300 and the third light from the wavelength conversion element 200, and combine the second light with the third light.
[0055] Before the second light is incident on the scattering and reflecting element 300, the angle diffusion element 400 changes the angular distribution of the second light so that the angular distribution of the second light expands in the direction of overall outward diffusion. After the second light leaves the angle diffusion element 400, the spot of the second light gradually expands as it travels in space until it is incident on the scattering and reflecting element 300. At this time, the size of the spot formed by the second light on the scattering and reflecting element 300 increases. Since the lateral diffusion of the second light by the scattering and reflecting element 300 is limited, the scattering and reflecting effect of the scattering and reflecting element 300 basically will not further increase the size of the spot. Therefore, the increase in the spot size of the incident second light on the light incident surface of the scattering and reflecting element 300 makes up for the difference in spot size between the second light emitted by the scattering and reflecting element 300 and the third light emitted by the wavelength conversion element 200. In addition, the angle diffusion element 400 expands the angular distribution of the second light in the direction of overall outward diffusion, that is, the central area and the surrounding area of the second light both diffuse outward in the angular distribution, reducing the light intensity of the central area of the second light, thereby compensating for the decrease in light intensity in the central area of the third light due to heat accumulation of the wavelength conversion element 200.
[0056] The first light and the second light can be set to have a Gaussian distribution, and the light intensity of the central area is significantly higher than the light intensity of the surrounding area. Based on the local heat accumulation of the wavelength conversion element 200, the light intensity of the central area of the emitted stimulated light is relatively reduced. The second light is diffused by the angle diffusion element 400, and both the central area and the surrounding area diffuse outward, but the diffused light in the central area makes up for the diffused light in the surrounding area and relatively increases the light intensity of the surrounding area, so that the relative proportion of the light intensity distribution of the central area and the surrounding area of the second light is basically consistent with the relative proportion of the light intensity distribution of the central area and the surrounding area of the third light emitted by the wavelength conversion element 2.
[0057] The light-emitting component 100 may be selected to include a laser diode or a light-emitting diode. The excitation light emitted by the light-emitting component 100 may include light components of different polarization states, spectra of different wavelength ranges, etc. The light-splitting and light-combining element 500, for example, splits the excitation light into a first light and a second light based on the different polarization states and different wavelength ranges of the excitation light. The light-splitting and light-combining element 500 is, for example, arranged obliquely relative to the incident direction of the excitation light, and guides the first light and the second light obtained by the splitting in different directions, for example, the first light obtained by the transmission splitting and the second light obtained by the reflection splitting. The light-splitting and light-combining element 500 can also split the light to obtain the first light and the second light based on the transmittance ratio (ratio of transmission and reflection) of the excitation light, and different reflection and transmission properties can be set in different areas of the light-splitting and light-combining element 500 to split the excitation light. For example, a reflective or transmissive structure is set in the central area of the light-splitting and light-combining element 500, and a transmissive or reflective structure is correspondingly set in the surrounding area of the light-splitting and light-combining element 500. Therefore, the central area and the surrounding area of the light-splitting and light-combining element 500 guide the excitation light in different directions respectively to split the light to obtain the first light and the second light. The light-splitting and light-combining element 500 as a whole also exhibits reflectivity to the third light and at least partial transmittance to the second light. Therefore, when receiving the third light from the wavelength conversion element 200 and the second light returned from the scattering and reflecting element 300, the light-splitting and light-combining element 500 reflects the third light and transmits the second light, so that the second light and the third light are combined into a beam of light on the optical path behind the light-splitting and light-combining element 500.
[0058] Reference Figure 6 , shows a schematic diagram of the structure of the wavelength conversion element. In some embodiments of the present application, the wavelength conversion element 200 includes a wavelength conversion layer 210, and the wavelength conversion layer 210 is used to convert at least part of the second light into a third light with a different wavelength range. Figure 5, the wavelength conversion layer 210, for example, includes a first substrate, in which wavelength conversion particles are distributed. The first substrate can be provided with a light-transmitting medium, that is, the second light can be incident into the interior of the first substrate, and the wavelength conversion particles can convert the wavelength of the second light incident into the first substrate, and randomly emit the converted third light in various directions. The first substrate includes but is not limited to ceramics, glass, etc. The wavelength conversion particles are not limited to (Sr, Ca) AlSiN3: Eu2+, YAG: Ce or LuAG: Ce. A reflective layer 220 is also provided on the surface of the substrate on the side facing away from the incident direction of the second light, and the reflective layer 220 is used to reflect the converted third light toward the side where the second light is incident. In the first matrix, the wavelength conversion particles convert the second light into the third light based on excitation, and the generated third light is randomly emitted in various directions, which causes the converted third light to have a large lateral diffusion in the first matrix. On the other hand, part of the third light is totally reflected when it is incident on the incident surface of the first matrix due to the large angle relative to the first matrix, resulting in further diffusion in the lateral direction after one or more reflections through the reflective layer on the back of the first matrix and the incident surface of the matrix, thereby increasing the spot size of the emitted third light.
[0059] In some embodiments of the present application, a heat-conducting substrate is further provided on the side of the reflective layer 220 facing away from the wavelength conversion layer 210 , so as to absorb heat from the wavelength conversion layer 210 and dissipate the heat.
[0060] In some embodiments of the present application, the scattering reflective element 300 includes, for example, a second substrate, a second substrate, and first scattering particles are distributed in the second substrate. The second substrate has a transmittance to the second light, wherein the transmittance of the second substrate is selected to be less than the transmittance of the first substrate. That is, the second light can be incident into the second substrate and scattered by the first scattering particles. The first scattering particles are configured to scatter the second light in a non-excitation manner. In some examples, the first scattering particles scatter the second light by reflectivity to the second light, for example, the outer surface of the first scattering particles can reflect the incident second light. A reflective layer is provided on the surface of the second substrate on one side facing away from the incident direction of the second light, and the reflective layer is used to reflect part of the second light toward the direction in which the second light is incident. The scattering reflective element 300 scatters the second light in a non-excitation manner, and the scale of the lateral diffusion of the second light generated in the first scattering reflective element 300 is very limited, compared with the size of the lateral diffusion of the third light in the wavelength conversion element 200. Therefore, after adding the angle diffusion element 400, even if the spot size of the received second light is significantly increased, the scattering reflection element 300 will not significantly enlarge the spot size of the second light formed on the light exit surface after scattering, which is helpful to ensure that the second light and the third light have basically the same spot size.
[0061] In some embodiments of the present application, the angle diffusion element 400 includes a third matrix, and second scattering particles are distributed in the third matrix, and the second scattering particles have angular diffusion properties for the second light. The second scattering particles can be randomly arranged in the third matrix, and the second scattering particles have, for example, reflectivity and / or refraction properties for the light. When the second light is incident on the third matrix, the second scattering particles distributed in the third matrix change direction once or multiple times, so that the angular distribution of the second light is diffused.
[0062] In some embodiments of the present application, the angle diffusion element 400 also receives the second light from the scattering reflective element 300, and expands the beam angle of the second light again. It can be understood that the angle diffusion element 400 expands the beam angle of the second light before the second light is incident on the scattering reflective element 300, and expands the beam angle of the second light again after the scattering reflective element 300 returns the scattered second light, so as to compensate for the difference in light spot and angle distribution between the second light and the third light through multiple angle diffusions, and improve the uniformity of the light spot formed by the second light and the third photosynthetic light.
[0063] In some embodiments of the present application, the diffusion angle range of the angle diffusion element 400 is 0.4 to 5 degrees. When the diffusion angle range of the angle diffusion element 400 is less than 0.4 degrees, the angle diffusion element 400 has limited expansion of the beam angle of the second light, and the spot size formed by the light incident on the incident surface of the scattering reflection element 300 is smaller than the spot size formed by the third light on the light exit surface of the wavelength conversion element 200. When the diffusion angle range of the angle diffusion element 400 is less than 0.4 degrees, the relative proportion of the light intensity in the central area of the second light is limited to decrease, and the relative proportion of the light intensity in the surrounding area is also limited to increase, so the spot area after the second light and the third light are combined will still have relatively obvious color non-uniformity. When the diffusion angle range of the angle diffusion element 400 is greater than 5 degrees, the angle diffusion element 400 greatly expands the beam angle of the second light, resulting in the second light spot on the scattering reflection element 300 being larger than the third light spot size on the light exit surface of the wavelength conversion element 200, and the light intensity of the central area of the second light is greatly reduced, resulting in the spot area after the second light and the third light are combined to also show obvious color unevenness. When the diffusion angle range of the angle diffusion element 400 is within the range of 0.4 degrees to 5 degrees, the second light increases the beam angle through the angle diffusion element 400, so that the second light and the third light spot size are basically the same, and the relative ratio of the light intensity of the central area and the surrounding area of the second light is also basically the same as the relative ratio of the light intensity of the central area and the surrounding area of the third light, so the second light and the third light have good uniformity in the entire spot area after the light is combined.
[0064] In some embodiments of the present application, Figure 7The light source device further includes a first collecting lens 600, which is disposed between the light splitting and combining element 500 and the wavelength conversion element 200. The first collecting lens 600 is used to converge the first light to the wavelength conversion element 200 and collect the third light emitted by the wavelength conversion element 200. The first collecting lens 600 converges the first light to the wavelength conversion element 200, thereby increasing the central brightness of the converted light emitted by the wavelength conversion element 200. The focus of the first collecting lens 600 can be set on the wavelength conversion element 200, or in front of or behind the wavelength conversion element 200. The first collecting lens 600 also collects the converted light emitted by the wavelength conversion element 200 and reduces the divergence angle of the emitted converted light. The setting of the first collecting lens 600 can improve the utilization efficiency of the converted light. The first collecting lens 600 can be set as one or more lens elements.
[0065] In some embodiments of the present application, the light source device further includes a second collecting lens 700, which is disposed between the light-splitting and light-combining element 500 and the scattering and reflecting element 300, and is used to converge the second light to the scattering and reflecting element 300, and collect the second light emitted by the scattering and reflecting element 300. The second collecting lens 700 may also be configured as one or more lens elements. In some examples, the second collecting lens 700 may be configured to have the same or similar parameters as the first collecting lens 600, so that the first collecting lens 600 and the second collecting lens 700 are consistent, avoiding the difference in light distribution between the third light and the second light caused by the difference in the first collecting lens 600 and the second collecting lens 700.
[0066] The angle diffusion element 400 can be disposed between the second collecting lens 700 and the light splitting and light combining element 500 , or between the second collecting lens 700 and the scattering and reflecting element 300 .
[0067] In some embodiments of the present application, the light source device further includes a projection lens, which is arranged on the optical path of the combined light of the second light and the third light emitted by the light-splitting and light-combining element 500, so as to project the combined light of the second light and the third light to form an output light. The projection lens includes a focusing lens 800, which is used to focus the combined light of the second light and the third light. The projection lens also includes a collimating lens 900, which is arranged behind the focus of the focusing lens 800, and is used to collimate the combined light of the second light and the third light for output. The combined light of the second light and the third light is focused on a focal point through the focusing lens 800, wherein the combined light continues to travel at a certain divergence angle after passing through the focal point, and the relative position of the collimating lens 900 relative to the focus of the focusing lens 800 is changed, so that the spot size of the combined light incident on the collimating lens 900 can be changed, thereby adjusting the spot size of the combined light emitted through the collimating lens 900.
[0068] The applicant conducted an experiment on the light spot formed by the light emitted by the light source device of the embodiment of the present application on the distant screen. Figure 8 As shown, in the embodiment of the present application, the light spot formed on the distant screen has very uniform colors in its central area and surrounding areas.
[0069] Table 1 Figure 1 The light source device shown is Figure 5 The experimental data of the illumination intensity of the illumination spot emitted by the light source device are shown in Table 1. In the embodiment without the angle diffusion element, the central color temperature of the illumination spot emitted by the light source device is relatively high, i.e., 9567K, that is, the blue light at the center of the spot is relatively bright.
[0070]
[0071]
[0072] The color temperature of the edge of the illumination spot is lower, that is, 4969K, which means that there is more yellow light at the edge of the spot. The actual spot distribution is as follows: Figure 2 When the angle diffusion element 400 is added, the center color temperature of the illumination spot emitted by the light source device is 6736K, and the edge color temperature of the illumination spot is 6418K. That is to say, after the angle diffusion element 400 is added, the uniformity of the light spot emitted by the light source device is significantly improved. In addition, it should be noted that, as shown in Table 1, after the angle diffusion element 400 is added, the illumination of the illumination spot emitted by the light source device does not change much, that is, the angle diffusion element does not increase the light loss of the light source device.
[0073] Referring to FIG. 9 below, Figure 9a To add a schematic diagram of the light spot change of the angle diffusion element 400, Figure 9b This is a schematic diagram of the light spot change without adding the angle diffusion element 400. Figure 9b When the angle diffusion element 400 is not added, the excitation light emitted by the light-emitting component 100 is split by the light-splitting and light-combining element 500, and the second light is reflected toward the scattering and reflecting element 300. The second light is incident on the scattering and reflecting element 300, and the light spot formed on the scattering and reflecting element 300 is relatively small. Even if the scattering and reflecting element 300 has a certain lateral diffusion after scattering the second light, the light spot of the emitted second light on the light-emitting surface of the scattering and reflecting element 300 is still relatively small, and the light spot formed by the second light after being combined by the light-splitting and light-combining element 500 is also relatively small. Figure 9bAfter the angle diffusion element 400 is added, the angle diffusion element 400 expands the divergence angle of the second light, but basically does not change the surface distribution of the second light. When the second light travels a certain distance to reach the scattering reflection element 300, the light spot formed on the incident surface of the scattering reflection element 300 is significantly increased, and the second light emitted after being scattered by the scattering reflection element 300 also has a larger light spot accordingly. Therefore, the light spot formed after being combined by the lightsplitting and combining element 500 has a larger light spot.
[0074] Referring to FIG. 10 , Fig.10a FIG. 4 shows a schematic diagram of the light spot change when an angle diffusion element 400 is added. Fig.10b FIG. 2 shows a schematic diagram of the light spot change of the wavelength conversion element 200. Fig.10a After the angle diffusion element 400 is added, the second light first passes through the angle diffusion element 400 to perform angle diffusion on the second light before it enters the scattering reflection element 300. Therefore, when the second light enters the scattering reflection element 300, the size of the light spot formed on the incident surface of the scattering reflection element 300 increases, and due to the angle diffusion effect of the angle diffusion element 400, the divergence angle of the second light emitted by the scattering reflection element 300 also increases. Fig.10b From the change of the light spot of the wavelength conversion element 300, it can be seen that the light spot size of the second light incident on the scattering reflection element 300 is larger than the light spot size of the first light incident on the wavelength conversion element 200, but the lateral diffusion of the first light by the wavelength conversion element 200 is significantly larger than the lateral diffusion of the second light by the scattering reflection element 300, and finally the light spot size of the second light formed by the exit surface of the scattering reflection element 300 is basically the same as the light spot size of the third light formed by the exit surface of the wavelength conversion element 200, and the divergence angle of the second light emitted by the exit surface of the scattering reflection element 300 is basically the same as the divergence angle of the third light emitted by the exit surface of the wavelength conversion element 200. Therefore, the light spot formed by the combined light of the second light emitted by the scattering reflection element 300 and the third light emitted by the wavelength conversion element 300 in any cross section can have good consistency in surface distribution and angle distribution, and therefore has good color consistency within the range of the entire light spot.
[0075] The light source device of the embodiment of the present application can be used in lighting or projection systems such as stage lights, searchlights, and projectors, for example.
[0076] An embodiment of the present application also provides a lighting device, comprising the light source device as described above.
[0077] An embodiment of the present application further provides a projection device, comprising the light source device as described above.
[0078] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" 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 representation of the above terms does 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.
[0079] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims
1. A light source device, characterized in that: include: A light emitting component, used for emitting excitation light; A light splitting and combining element receives the excitation light and splits the excitation light into a first light and a second light traveling in different directions; a wavelength conversion element, configured to receive the first light and convert at least a portion of the first light into a third light having a different wavelength range; a scattering and reflecting element, configured to receive the second light, scatter the second light and return the scattered second light; as well as An angle diffusion element, disposed on the optical path of the second light between the light-splitting and light-combining element and the scattering and reflecting element, and used for expanding the beam angle of the second light before the second light is incident on the scattering and reflecting element; The light-splitting and light-combining element is further used to receive the second light from the scattering and reflecting element and the third light from the wavelength conversion element, and combine the second light with the third light.
2. The light source device according to claim 1, characterized in that: The diffusion angle of the angle diffusion element ranges from 0.4 degrees to 5 degrees.
3. The light source device according to claim 1, characterized in that: The angle diffusion element is further used for receiving the second light returned by the scattering reflection element and further expanding the beam angle of the second light.
4. The light source device according to claim 1, characterized in that: The wavelength conversion element comprises a wavelength conversion layer, and a reflective layer is disposed on a side of the wavelength conversion layer that is opposite to the incident direction of the first light; The wavelength conversion layer includes a first matrix in which wavelength conversion particles are distributed.
5. The light source device according to claim 1, characterized in that: The scattering reflective element includes a second matrix, in which first scattering particles are distributed, wherein the first scattering particles scatter the second light in a non-excited form.
6. The light source device according to claim 1, characterized in that: The scattering reflective element includes a second matrix, in which first scattering particles are distributed, wherein the first scattering particles scatter the second light in a reflection or refraction manner.
7. The light source device according to claim 1, characterized in that: The angle diffusion element includes a third matrix, in which second scattering particles are distributed, and the second scattering particles expand the beam angle of the second light by reflection or refraction.
8. The light source device according to claim 1, characterized in that: A microstructure is disposed on the light incident surface and / or the light exiting surface of the angle diffusion element, and the microstructure is used to expand the beam angle of the second light.
9. The light source device according to claim 1, characterized in that: It also includes a first collecting lens, which is arranged between the light splitting and combining element and the wavelength conversion element, and is used to converge the first light to the wavelength conversion element and collect the third light from the wavelength conversion element.
10. The light source device according to claim 1, characterized in that: It also includes a second collecting lens, which is arranged between the light combining element and the angle diffusion element, or between the angle diffusion element and the scattering reflection element, and is used to converge the second light to the scattering reflection element and collect the second light from the scattering reflection element.
11. A lighting system, characterized in that: The invention comprises the light source device according to any one of claims 1 to 10.
12. A projection system, characterized in that: The invention comprises the light source device according to any one of claims 1 to 10.